1 files changed, 1126 insertions, 1274 deletions

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index bf40d8c824ad..49dd2e7bae7a 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -15,7 +15,7 @@
  * Documentation/ide/ChangeLog.ide-tape.1995-2002
  */
 
-#define IDETAPE_VERSION "1.19"
+#define IDETAPE_VERSION "1.20"
 
 #include <linux/module.h>
 #include <linux/types.h>
@@ -39,63 +39,70 @@
 #include <scsi/scsi.h>
 
 #include <asm/byteorder.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-#include <asm/io.h>
+#include <linux/irq.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
 #include <asm/unaligned.h>
 #include <linux/mtio.h>
 
+enum {
+        /* output errors only */
+        DBG_ERR =               (1 << 0),
+        /* output all sense key/asc */
+        DBG_SENSE =             (1 << 1),
+        /* info regarding all chrdev-related procedures */
+        DBG_CHRDEV =            (1 << 2),
+        /* all remaining procedures */
+        DBG_PROCS =             (1 << 3),
+        /* buffer alloc info (pc_stack & rq_stack) */
+        DBG_PCRQ_STACK =        (1 << 4),
+};
+
+/* define to see debug info */
+#define IDETAPE_DEBUG_LOG               0
+
+#if IDETAPE_DEBUG_LOG
+#define debug_log(lvl, fmt, args...)                    \
+{                                                       \
+        if (tape->debug_mask & lvl)                     \
+        printk(KERN_INFO "ide-tape: " fmt, ## args);    \
+}
+#else
+#define debug_log(lvl, fmt, args...) do {} while (0)
+#endif
+
 /**************************** Tunable parameters *****************************/
 
 
 /*
- *      Pipelined mode parameters.
+ * Pipelined mode parameters.
  *
- *      We try to use the minimum number of stages which is enough to
- *      keep the tape constantly streaming. To accomplish that, we implement
- *      a feedback loop around the maximum number of stages:
+ * We try to use the minimum number of stages which is enough to keep the tape
+ * constantly streaming. To accomplish that, we implement a feedback loop around
+ * the maximum number of stages:
  *
- *      We start from MIN maximum stages (we will not even use MIN stages
- *      if we don't need them), increment it by RATE*(MAX-MIN)
- *      whenever we sense that the pipeline is empty, until we reach
- *      the optimum value or until we reach MAX.
+ * We start from MIN maximum stages (we will not even use MIN stages if we don't
+ * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
+ * pipeline is empty, until we reach the optimum value or until we reach MAX.
  *
- *      Setting the following parameter to 0 is illegal: the pipelined mode
- *      cannot be disabled (calculate_speeds() divides by tape->max_stages.)
+ * Setting the following parameter to 0 is illegal: the pipelined mode cannot be
+ * disabled (idetape_calculate_speeds() divides by tape->max_stages.)
  */
 #define IDETAPE_MIN_PIPELINE_STAGES       1
 #define IDETAPE_MAX_PIPELINE_STAGES     400
 #define IDETAPE_INCREASE_STAGES_RATE     20
 
 /*
- *      The following are used to debug the driver:
- *
- *      Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
+ * After each failed packet command we issue a request sense command and retry
+ * the packet command IDETAPE_MAX_PC_RETRIES times.
  *
- *      Setting them to 0 will restore normal operation mode:
- *
- *              1.      Disable logging normal successful operations.
- *              2.      Disable self-sanity checks.
- *              3.      Errors will still be logged, of course.
- *
- *      All the #if DEBUG code will be removed some day, when the driver
- *      is verified to be stable enough. This will make it much more
- *      esthetic.
- */
-#define IDETAPE_DEBUG_LOG               0
-
-/*
- *      After each failed packet command we issue a request sense command
- *      and retry the packet command IDETAPE_MAX_PC_RETRIES times.
- *
- *      Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
+ * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
  */
 #define IDETAPE_MAX_PC_RETRIES          3
 
 /*
- *      With each packet command, we allocate a buffer of
- *      IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
- *      commands (Not for READ/WRITE commands).
+ * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
+ * bytes. This is used for several packet commands (Not for READ/WRITE commands)
  */
 #define IDETAPE_PC_BUFFER_SIZE          256
 
@@ -114,48 +121,39 @@
 #define IDETAPE_WAIT_CMD                (900*HZ)
 
 /*
- *      The following parameter is used to select the point in the internal
- *      tape fifo in which we will start to refill the buffer. Decreasing
- *      the following parameter will improve the system's latency and
- *      interactive response, while using a high value might improve system
- *      throughput.
+ * The following parameter is used to select the point in the internal tape fifo
+ * in which we will start to refill the buffer. Decreasing the following
+ * parameter will improve the system's latency and interactive response, while
+ * using a high value might improve system throughput.
  */
-#define IDETAPE_FIFO_THRESHOLD          2
+#define IDETAPE_FIFO_THRESHOLD          2
 
 /*
- *      DSC polling parameters.
- *
- *      Polling for DSC (a single bit in the status register) is a very
- *      important function in ide-tape. There are two cases in which we
- *      poll for DSC:
+ * DSC polling parameters.
  *
- *      1.      Before a read/write packet command, to ensure that we
- *              can transfer data from/to the tape's data buffers, without
- *              causing an actual media access. In case the tape is not
- *              ready yet, we take out our request from the device
- *              request queue, so that ide.c will service requests from
- *              the other device on the same interface meanwhile.
+ * Polling for DSC (a single bit in the status register) is a very important
+ * function in ide-tape. There are two cases in which we poll for DSC:
  *
- *      2.      After the successful initialization of a "media access
- *              packet command", which is a command which can take a long
- *              time to complete (it can be several seconds or even an hour).
+ * 1. Before a read/write packet command, to ensure that we can transfer data
+ * from/to the tape's data buffers, without causing an actual media access.
+ * In case the tape is not ready yet, we take out our request from the device
+ * request queue, so that ide.c could service requests from the other device
+ * on the same interface in the meantime.
  *
- *              Again, we postpone our request in the middle to free the bus
- *              for the other device. The polling frequency here should be
- *              lower than the read/write frequency since those media access
- *              commands are slow. We start from a "fast" frequency -
- *              IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
- *              after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
- *              lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
+ * 2. After the successful initialization of a "media access packet command",
+ * which is a command that can take a long time to complete (the interval can
+ * range from several seconds to even an hour). Again, we postpone our request
+ * in the middle to free the bus for the other device. The polling frequency
+ * here should be lower than the read/write frequency since those media access
+ * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
+ * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
+ * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
  *
- *      We also set a timeout for the timer, in case something goes wrong.
- *      The timeout should be longer then the maximum execution time of a
- *      tape operation.
- */
- 
-/*
- *      DSC timings.
+ * We also set a timeout for the timer, in case something goes wrong. The
+ * timeout should be longer then the maximum execution time of a tape operation.
  */
+
+/* DSC timings. */
 #define IDETAPE_DSC_RW_MIN              5*HZ/100        /* 50 msec */
 #define IDETAPE_DSC_RW_MAX              40*HZ/100       /* 400 msec */
 #define IDETAPE_DSC_RW_TIMEOUT          2*60*HZ         /* 2 minutes */
@@ -166,19 +164,15 @@
 
 /*************************** End of tunable parameters ***********************/
 
-/*
- *      Read/Write error simulation
- */
+/* Read/Write error simulation */
 #define SIMULATE_ERRORS                 0
 
-/*
- *      For general magnetic tape device compatibility.
- */
-typedef enum {
-        idetape_direction_none,
-        idetape_direction_read,
-        idetape_direction_write
-} idetape_chrdev_direction_t;
+/* tape directions */
+enum {
+        IDETAPE_DIR_NONE  = (1 << 0),
+        IDETAPE_DIR_READ  = (1 << 1),
+        IDETAPE_DIR_WRITE = (1 << 2),
+};
 
 struct idetape_bh {
         u32 b_size;
@@ -187,24 +181,32 @@ struct idetape_bh {
         char *b_data;
 };
 
-/*
- *      Our view of a packet command.
- */
 typedef struct idetape_packet_command_s {
-        u8 c[12];                               /* Actual packet bytes */
-        int retries;                            /* On each retry, we increment retries */
-        int error;                              /* Error code */
-        int request_transfer;                   /* Bytes to transfer */
-        int actually_transferred;               /* Bytes actually transferred */
-        int buffer_size;                        /* Size of our data buffer */
+        /* Actual packet bytes */
+        u8 c[12];
+        /* On each retry, we increment retries */
+        int retries;
+        /* Error code */
+        int error;
+        /* Bytes to transfer */
+        int request_transfer;
+        /* Bytes actually transferred */
+        int actually_transferred;
+        /* Size of our data buffer */
+        int buffer_size;
         struct idetape_bh *bh;
         char *b_data;
         int b_count;
-        u8 *buffer;                             /* Data buffer */
-        u8 *current_position;                   /* Pointer into the above buffer */
-        ide_startstop_t (*callback) (ide_drive_t *);    /* Called when this packet command is completed */
-        u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE];   /* Temporary buffer */
-        unsigned long flags;                    /* Status/Action bit flags: long for set_bit */
+        /* Data buffer */
+        u8 *buffer;
+        /* Pointer into the above buffer */
+        u8 *current_position;
+        /* Called when this packet command is completed */
+        ide_startstop_t (*callback) (ide_drive_t *);
+        /* Temporary buffer */
+        u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE];
+        /* Status/Action bit flags: long for set_bit */
+        unsigned long flags;
 } idetape_pc_t;
 
 /*
@@ -223,9 +225,7 @@ typedef struct idetape_packet_command_s {
 /* Data direction */
 #define PC_WRITING                      5
 
-/*
- *      A pipeline stage.
- */
+/* A pipeline stage. */
 typedef struct idetape_stage_s {
         struct request rq;                      /* The corresponding request */
         struct idetape_bh *bh;                  /* The data buffers */
@@ -233,9 +233,8 @@ typedef struct idetape_stage_s {
 } idetape_stage_t;
 
 /*
- *      Most of our global data which we need to save even as we leave the
- *      driver due to an interrupt or a timer event is stored in a variable
- *      of type idetape_tape_t, defined below.
+ * Most of our global data which we need to save even as we leave the driver due
+ * to an interrupt or a timer event is stored in the struct defined below.
  */
 typedef struct ide_tape_obj {
         ide_drive_t     *drive;
@@ -271,15 +270,14 @@ typedef struct ide_tape_obj {
         int rq_stack_index;
 
         /*
-         *      DSC polling variables.
+         * DSC polling variables.
          *
-         *      While polling for DSC we use postponed_rq to postpone the
-         *      current request so that ide.c will be able to service
-         *      pending requests on the other device. Note that at most
-         *      we will have only one DSC (usually data transfer) request
-         *      in the device request queue. Additional requests can be
-         *      queued in our internal pipeline, but they will be visible
-         *      to ide.c only one at a time.
+         * While polling for DSC we use postponed_rq to postpone the current
+         * request so that ide.c will be able to service pending requests on the
+         * other device. Note that at most we will have only one DSC (usually
+         * data transfer) request in the device request queue. Additional
+         * requests can be queued in our internal pipeline, but they will be
+         * visible to ide.c only one at a time.
          */
         struct request *postponed_rq;
         /* The time in which we started polling for DSC */
@@ -287,73 +285,57 @@ typedef struct ide_tape_obj {
         /* Timer used to poll for dsc */
         struct timer_list dsc_timer;
         /* Read/Write dsc polling frequency */
-        unsigned long best_dsc_rw_frequency;
-        /* The current polling frequency */
-        unsigned long dsc_polling_frequency;
-        /* Maximum waiting time */
+        unsigned long best_dsc_rw_freq;
+        unsigned long dsc_poll_freq;
         unsigned long dsc_timeout;
 
-        /*
-         *      Read position information
-         */
+        /* Read position information */
         u8 partition;
         /* Current block */
-        unsigned int first_frame_position;
-        unsigned int last_frame_position;
-        unsigned int blocks_in_buffer;
+        unsigned int first_frame;
 
-        /*
-         *      Last error information
-         */
+        /* Last error information */
         u8 sense_key, asc, ascq;
 
-        /*
-         *      Character device operation
-         */
+        /* Character device operation */
         unsigned int minor;
         /* device name */
         char name[4];
         /* Current character device data transfer direction */
-        idetape_chrdev_direction_t chrdev_direction;
+        u8 chrdev_dir;
 
-        /*
-         *      Device information
-         */
-        /* Usually 512 or 1024 bytes */
-        unsigned short tape_block_size;
+        /* tape block size, usually 512 or 1024 bytes */
+        unsigned short blk_size;
         int user_bs_factor;
 
         /* Copy of the tape's Capabilities and Mechanical Page */
         u8 caps[20];
 
         /*
-         *      Active data transfer request parameters.
-         *
-         *      At most, there is only one ide-tape originated data transfer
-         *      request in the device request queue. This allows ide.c to
-         *      easily service requests from the other device when we
-         *      postpone our active request. In the pipelined operation
-         *      mode, we use our internal pipeline structure to hold
-         *      more data requests.
+         * Active data transfer request parameters.
          *
-         *      The data buffer size is chosen based on the tape's
-         *      recommendation.
+         * At most, there is only one ide-tape originated data transfer request
+         * in the device request queue. This allows ide.c to easily service
+         * requests from the other device when we postpone our active request.
+         * In the pipelined operation mode, we use our internal pipeline
+         * structure to hold more data requests. The data buffer size is chosen
+         * based on the tape's recommendation.
          */
-        /* Pointer to the request which is waiting in the device request queue */
-        struct request *active_data_request;
-        /* Data buffer size (chosen based on the tape's recommendation */
+        /* ptr to the request which is waiting in the device request queue */
+        struct request *active_data_rq;
+        /* Data buffer size chosen based on the tape's recommendation */
         int stage_size;
         idetape_stage_t *merge_stage;
         int merge_stage_size;
         struct idetape_bh *bh;
         char *b_data;
         int b_count;
-        
+
         /*
-         *      Pipeline parameters.
+         * Pipeline parameters.
          *
-         *      To accomplish non-pipelined mode, we simply set the following
-         *      variables to zero (or NULL, where appropriate).
+         * To accomplish non-pipelined mode, we simply set the following
+         * variables to zero (or NULL, where appropriate).
          */
         /* Number of currently used stages */
         int nr_stages;
@@ -378,20 +360,13 @@ typedef struct ide_tape_obj {
         /* Status/Action flags: long for set_bit */
         unsigned long flags;
         /* protects the ide-tape queue */
-        spinlock_t spinlock;
+        spinlock_t lock;
 
-        /*
-         * Measures average tape speed
-         */
+        /* Measures average tape speed */
         unsigned long avg_time;
         int avg_size;
         int avg_speed;
 
-        char vendor_id[10];
-        char product_id[18];
-        char firmware_revision[6];
-        int firmware_revision_num;
-
         /* the door is currently locked */
         int door_locked;
         /* the tape hardware is write protected */
@@ -400,11 +375,9 @@ typedef struct ide_tape_obj {
         char write_prot;
 
         /*
-         * Limit the number of times a request can
-         * be postponed, to avoid an infinite postpone
-         * deadlock.
+         * Limit the number of times a request can be postponed, to avoid an
+         * infinite postpone deadlock.
          */
-        /* request postpone count limit */
         int postpone_cnt;
 
         /*
@@ -419,30 +392,19 @@ typedef struct ide_tape_obj {
         int tape_head;
         int last_tape_head;
 
-        /*
-         * Speed control at the tape buffers input/output
-         */
+        /* Speed control at the tape buffers input/output */
         unsigned long insert_time;
         int insert_size;
         int insert_speed;
         int max_insert_speed;
         int measure_insert_time;
 
-        /*
-         * Measure tape still time, in milliseconds
-         */
-        unsigned long tape_still_time_begin;
-        int tape_still_time;
-
-        /*
-         * Speed regulation negative feedback loop
-         */
+        /* Speed regulation negative feedback loop */
         int speed_control;
         int pipeline_head_speed;
         int controlled_pipeline_head_speed;
         int uncontrolled_pipeline_head_speed;
         int controlled_last_pipeline_head;
-        int uncontrolled_last_pipeline_head;
         unsigned long uncontrolled_pipeline_head_time;
         unsigned long controlled_pipeline_head_time;
         int controlled_previous_pipeline_head;
@@ -451,18 +413,7 @@ typedef struct ide_tape_obj {
         unsigned long uncontrolled_previous_head_time;
         int restart_speed_control_req;
 
-        /*
-         * Debug_level determines amount of debugging output;
-         * can be changed using /proc/ide/hdx/settings
-         * 0 : almost no debugging output
-         * 1 : 0+output errors only
-         * 2 : 1+output all sensekey/asc
-         * 3 : 2+follow all chrdev related procedures
-         * 4 : 3+follow all procedures
-         * 5 : 4+include pc_stack rq_stack info
-         * 6 : 5+USE_COUNT updates
-         */
-         int debug_level; 
+        u32 debug_mask;
 } idetape_tape_t;
 
 static DEFINE_MUTEX(idetape_ref_mutex);
@@ -495,9 +446,7 @@ static void ide_tape_put(struct ide_tape_obj *tape)
         mutex_unlock(&idetape_ref_mutex);
 }
 
-/*
- *      Tape door status
- */
+/* Tape door status */
 #define DOOR_UNLOCKED                   0
 #define DOOR_LOCKED                     1
 #define DOOR_EXPLICITLY_LOCKED          2
@@ -517,30 +466,23 @@ static void ide_tape_put(struct ide_tape_obj *tape)
 /* 0 = no tape is loaded, so we don't rewind after ejecting */
 #define IDETAPE_MEDIUM_PRESENT          9
 
-/*
- *      Some defines for the READ BUFFER command
- */
+/* A define for the READ BUFFER command */
 #define IDETAPE_RETRIEVE_FAULTY_BLOCK   6
 
-/*
- *      Some defines for the SPACE command
- */
+/* Some defines for the SPACE command */
 #define IDETAPE_SPACE_OVER_FILEMARK     1
 #define IDETAPE_SPACE_TO_EOD            3
 
-/*
- *      Some defines for the LOAD UNLOAD command
- */
+/* Some defines for the LOAD UNLOAD command */
 #define IDETAPE_LU_LOAD_MASK            1
 #define IDETAPE_LU_RETENSION_MASK       2
 #define IDETAPE_LU_EOT_MASK             4
 
 /*
- *      Special requests for our block device strategy routine.
+ * Special requests for our block device strategy routine.
  *
- *      In order to service a character device command, we add special
- *      requests to the tail of our block device request queue and wait
- *      for their completion.
+ * In order to service a character device command, we add special requests to
+ * the tail of our block device request queue and wait for their completion.
  */
 
 enum {
@@ -551,55 +493,20 @@ enum {
         REQ_IDETAPE_READ_BUFFER = (1 << 4),
 };
 
-/*
- *      Error codes which are returned in rq->errors to the higher part
- *      of the driver.
- */
+/* Error codes returned in rq->errors to the higher part of the driver. */
 #define IDETAPE_ERROR_GENERAL           101
 #define IDETAPE_ERROR_FILEMARK          102
 #define IDETAPE_ERROR_EOD               103
 
-/*
- *      The following is used to format the general configuration word of
- *      the ATAPI IDENTIFY DEVICE command.
- */
-struct idetape_id_gcw { 
-        unsigned packet_size            :2;     /* Packet Size */
-        unsigned reserved234            :3;     /* Reserved */
-        unsigned drq_type               :2;     /* Command packet DRQ type */
-        unsigned removable              :1;     /* Removable media */
-        unsigned device_type            :5;     /* Device type */
-        unsigned reserved13             :1;     /* Reserved */
-        unsigned protocol               :2;     /* Protocol type */
-};
-
-/*
- *      READ POSITION packet command - Data Format (From Table 6-57)
- */
-typedef struct {
-        unsigned        reserved0_10    :2;     /* Reserved */
-        unsigned        bpu             :1;     /* Block Position Unknown */    
-        unsigned        reserved0_543   :3;     /* Reserved */
-        unsigned        eop             :1;     /* End Of Partition */
-        unsigned        bop             :1;     /* Beginning Of Partition */
-        u8              partition;              /* Partition Number */
-        u8              reserved2, reserved3;   /* Reserved */
-        u32             first_block;            /* First Block Location */
-        u32             last_block;             /* Last Block Location (Optional) */
-        u8              reserved12;             /* Reserved */
-        u8              blocks_in_buffer[3];    /* Blocks In Buffer - (Optional) */
-        u32             bytes_in_buffer;        /* Bytes In Buffer (Optional) */
-} idetape_read_position_result_t;
-
 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
 #define IDETAPE_BLOCK_DESCRIPTOR        0
 #define IDETAPE_CAPABILITIES_PAGE       0x2a
 
 /*
- *      The variables below are used for the character device interface.
- *      Additional state variables are defined in our ide_drive_t structure.
+ * The variables below are used for the character device interface. Additional
+ * state variables are defined in our ide_drive_t structure.
  */
-static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
+static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
 
 #define ide_tape_f(file) ((file)->private_data)
 
@@ -616,23 +523,17 @@ static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
 }
 
 /*
- *      Function declarations
- *
- */
-static int idetape_chrdev_release (struct inode *inode, struct file *filp);
-static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
-
-/*
  * Too bad. The drive wants to send us data which we are not ready to accept.
  * Just throw it away.
  */
-static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
+static void idetape_discard_data(ide_drive_t *drive, unsigned int bcount)
 {
         while (bcount--)
                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 }
 
-static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
+static void idetape_input_buffers(ide_drive_t *drive, idetape_pc_t *pc,
+                                  unsigned int bcount)
 {
         struct idetape_bh *bh = pc->bh;
         int count;
@@ -644,8 +545,11 @@ static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigne
                         idetape_discard_data(drive, bcount);
                         return;
                 }
-                count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
-                HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
+                count = min(
+                        (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
+                        bcount);
+                HWIF(drive)->atapi_input_bytes(drive, bh->b_data +
+                                        atomic_read(&bh->b_count), count);
                 bcount -= count;
                 atomic_add(count, &bh->b_count);
                 if (atomic_read(&bh->b_count) == bh->b_size) {
@@ -657,15 +561,16 @@ static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigne
         pc->bh = bh;
 }
 
-static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
+static void idetape_output_buffers(ide_drive_t *drive, idetape_pc_t *pc,
+                                   unsigned int bcount)
 {
         struct idetape_bh *bh = pc->bh;
         int count;
 
         while (bcount) {
                 if (bh == NULL) {
-                        printk(KERN_ERR "ide-tape: bh == NULL in "
-                                "idetape_output_buffers\n");
+                        printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
+                                        __func__);
                         return;
                 }
                 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
@@ -674,7 +579,8 @@ static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsign
                 pc->b_data += count;
                 pc->b_count -= count;
                 if (!pc->b_count) {
-                        pc->bh = bh = bh->b_reqnext;
+                        bh = bh->b_reqnext;
+                        pc->bh = bh;
                         if (bh) {
                                 pc->b_data = bh->b_data;
                                 pc->b_count = atomic_read(&bh->b_count);
@@ -683,7 +589,7 @@ static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsign
         }
 }
 
-static void idetape_update_buffers (idetape_pc_t *pc)
+static void idetape_update_buffers(idetape_pc_t *pc)
 {
         struct idetape_bh *bh = pc->bh;
         int count;
@@ -693,8 +599,8 @@ static void idetape_update_buffers (idetape_pc_t *pc)
                 return;
         while (bcount) {
                 if (bh == NULL) {
-                        printk(KERN_ERR "ide-tape: bh == NULL in "
-                                "idetape_update_buffers\n");
+                        printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
+                                        __func__);
                         return;
                 }
                 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
@@ -712,17 +618,14 @@ static void idetape_update_buffers (idetape_pc_t *pc)
  *      driver. A storage space for a maximum of IDETAPE_PC_STACK packet
  *      commands is allocated at initialization time.
  */
-static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
+static idetape_pc_t *idetape_next_pc_storage(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 5)
-                printk(KERN_INFO "ide-tape: pc_stack_index=%d\n",
-                        tape->pc_stack_index);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
+
         if (tape->pc_stack_index == IDETAPE_PC_STACK)
-                tape->pc_stack_index=0;
+                tape->pc_stack_index = 0;
         return (&tape->pc_stack[tape->pc_stack_index++]);
 }
 
@@ -731,32 +634,26 @@ static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
  *      Since we queue packet commands in the request queue, we need to
  *      allocate a request, along with the allocation of a packet command.
  */
- 
+
 /**************************************************************
  *                                                            *
  *  This should get fixed to use kmalloc(.., GFP_ATOMIC)      *
  *  followed later on by kfree().   -ml                       *
  *                                                            *
  **************************************************************/
- 
-static struct request *idetape_next_rq_storage (ide_drive_t *drive)
+
+static struct request *idetape_next_rq_storage(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 5)
-                printk(KERN_INFO "ide-tape: rq_stack_index=%d\n",
-                        tape->rq_stack_index);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
+
         if (tape->rq_stack_index == IDETAPE_PC_STACK)
-                tape->rq_stack_index=0;
+                tape->rq_stack_index = 0;
         return (&tape->rq_stack[tape->rq_stack_index++]);
 }
 
-/*
- *      idetape_init_pc initializes a packet command.
- */
-static void idetape_init_pc (idetape_pc_t *pc)
+static void idetape_init_pc(idetape_pc_t *pc)
 {
         memset(pc->c, 0, 12);
         pc->retries = 0;
@@ -780,22 +677,14 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
         tape->sense_key = sense[2] & 0xF;
         tape->asc       = sense[12];
         tape->ascq      = sense[13];
-#if IDETAPE_DEBUG_LOG
-        /*
-         * Without debugging, we only log an error if we decided to give up
-         * retrying.
-         */
-        if (tape->debug_level >= 1)
-                printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, "
-                        "asc = %x, ascq = %x\n",
-                        pc->c[0], tape->sense_key,
-                        tape->asc, tape->ascq);
-#endif /* IDETAPE_DEBUG_LOG */
+
+        debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
+                 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
 
         /* Correct pc->actually_transferred by asking the tape.  */
         if (test_bit(PC_DMA_ERROR, &pc->flags)) {
                 pc->actually_transferred = pc->request_transfer -
-                        tape->tape_block_size *
+                        tape->blk_size *
                         be32_to_cpu(get_unaligned((u32 *)&sense[3]));
                 idetape_update_buffers(pc);
         }
@@ -843,50 +732,24 @@ static void idetape_activate_next_stage(ide_drive_t *drive)
         idetape_stage_t *stage = tape->next_stage;
         struct request *rq = &stage->rq;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
+
         if (stage == NULL) {
-                printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
+                printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
+                                " existing stage\n");
                 return;
         }
 
         rq->rq_disk = tape->disk;
         rq->buffer = NULL;
         rq->special = (void *)stage->bh;
-        tape->active_data_request = rq;
+        tape->active_data_rq = rq;
         tape->active_stage = stage;
         tape->next_stage = stage->next;
 }
 
-/*
- *      idetape_increase_max_pipeline_stages is a part of the feedback
- *      loop which tries to find the optimum number of stages. In the
- *      feedback loop, we are starting from a minimum maximum number of
- *      stages, and if we sense that the pipeline is empty, we try to
- *      increase it, until we reach the user compile time memory limit.
- */
-static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
-{
-        idetape_tape_t *tape = drive->driver_data;
-        int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
-        
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
-        tape->max_stages += max(increase, 1);
-        tape->max_stages = max(tape->max_stages, tape->min_pipeline);
-        tape->max_stages = min(tape->max_stages, tape->max_pipeline);
-}
-
-/*
- *      idetape_kfree_stage calls kfree to completely free a stage, along with
- *      its related buffers.
- */
-static void __idetape_kfree_stage (idetape_stage_t *stage)
+/* Free a stage along with its related buffers completely. */
+static void __idetape_kfree_stage(idetape_stage_t *stage)
 {
         struct idetape_bh *prev_bh, *bh = stage->bh;
         int size;
@@ -907,30 +770,29 @@ static void __idetape_kfree_stage (idetape_stage_t *stage)
         kfree(stage);
 }
 
-static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
+static void idetape_kfree_stage(idetape_tape_t *tape, idetape_stage_t *stage)
 {
         __idetape_kfree_stage(stage);
 }
 
 /*
- *      idetape_remove_stage_head removes tape->first_stage from the pipeline.
- *      The caller should avoid race conditions.
+ * Remove tape->first_stage from the pipeline. The caller should avoid race
+ * conditions.
  */
-static void idetape_remove_stage_head (ide_drive_t *drive)
+static void idetape_remove_stage_head(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_stage_t *stage;
-        
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
-#endif /* IDETAPE_DEBUG_LOG */
+
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
+
         if (tape->first_stage == NULL) {
                 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
                 return;
         }
         if (tape->active_stage == tape->first_stage) {
-                printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
+                printk(KERN_ERR "ide-tape: bug: Trying to free our active "
+                                "pipeline stage\n");
                 return;
         }
         stage = tape->first_stage;
@@ -940,9 +802,11 @@ static void idetape_remove_stage_head (ide_drive_t *drive)
         if (tape->first_stage == NULL) {
                 tape->last_stage = NULL;
                 if (tape->next_stage != NULL)
-                        printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
+                        printk(KERN_ERR "ide-tape: bug: tape->next_stage !="
+                                        " NULL\n");
                 if (tape->nr_stages)
-                        printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
+                        printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 "
+                                        "now\n");
         }
 }
 
@@ -957,10 +821,8 @@ static void idetape_abort_pipeline(ide_drive_t *drive,
         idetape_stage_t *stage = new_last_stage->next;
         idetape_stage_t *nstage;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
-#endif
+        debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
+
         while (stage) {
                 nstage = stage->next;
                 idetape_kfree_stage(tape, stage);
@@ -975,8 +837,8 @@ static void idetape_abort_pipeline(ide_drive_t *drive,
 }
 
 /*
- *      idetape_end_request is used to finish servicing a request, and to
- *      insert a pending pipeline request into the main device queue.
+ * Finish servicing a request and insert a pending pipeline request into the
+ * main device queue.
  */
 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
 {
@@ -987,15 +849,12 @@ static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
         int remove_stage = 0;
         idetape_stage_t *active_stage;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-        printk(KERN_INFO "ide-tape: Reached idetape_end_request\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
         switch (uptodate) {
-                case 0: error = IDETAPE_ERROR_GENERAL; break;
-                case 1: error = 0; break;
-                default: error = uptodate;
+        case 0: error = IDETAPE_ERROR_GENERAL; break;
+        case 1: error = 0; break;
+        default: error = uptodate;
         }
         rq->errors = error;
         if (error)
@@ -1006,20 +865,21 @@ static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
                 return 0;
         }
 
-        spin_lock_irqsave(&tape->spinlock, flags);
+        spin_lock_irqsave(&tape->lock, flags);
 
         /* The request was a pipelined data transfer request */
-        if (tape->active_data_request == rq) {
+        if (tape->active_data_rq == rq) {
                 active_stage = tape->active_stage;
                 tape->active_stage = NULL;
-                tape->active_data_request = NULL;
+                tape->active_data_rq = NULL;
                 tape->nr_pending_stages--;
                 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
                         remove_stage = 1;
                         if (error) {
                                 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
                                 if (error == IDETAPE_ERROR_EOD)
-                                        idetape_abort_pipeline(drive, active_stage);
+                                        idetape_abort_pipeline(drive,
+                                                                active_stage);
                         }
                 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
                         if (error == IDETAPE_ERROR_EOD) {
@@ -1030,48 +890,57 @@ static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
                 if (tape->next_stage != NULL) {
                         idetape_activate_next_stage(drive);
 
+                        /* Insert the next request into the request queue. */
+                        (void)ide_do_drive_cmd(drive, tape->active_data_rq,
+                                                ide_end);
+                } else if (!error) {
                         /*
-                         * Insert the next request into the request queue.
+                         * This is a part of the feedback loop which tries to
+                         * find the optimum number of stages. We are starting
+                         * from a minimum maximum number of stages, and if we
+                         * sense that the pipeline is empty, we try to increase
+                         * it, until we reach the user compile time memory
+                         * limit.
                          */
-                        (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
-                } else if (!error) {
-                                idetape_increase_max_pipeline_stages(drive);
+                        int i = (tape->max_pipeline - tape->min_pipeline) / 10;
+
+                        tape->max_stages += max(i, 1);
+                        tape->max_stages = max(tape->max_stages,
+                                                tape->min_pipeline);
+                        tape->max_stages = min(tape->max_stages,
+                                                tape->max_pipeline);
                 }
         }
         ide_end_drive_cmd(drive, 0, 0);
-//      blkdev_dequeue_request(rq);
-//      drive->rq = NULL;
-//      end_that_request_last(rq);
 
         if (remove_stage)
                 idetape_remove_stage_head(drive);
-        if (tape->active_data_request == NULL)
+        if (tape->active_data_rq == NULL)
                 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
-        spin_unlock_irqrestore(&tape->spinlock, flags);
+        spin_unlock_irqrestore(&tape->lock, flags);
         return 0;
 }
 
-static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
+static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
+
         if (!tape->pc->error) {
                 idetape_analyze_error(drive, tape->pc->buffer);
                 idetape_end_request(drive, 1, 0);
         } else {
-                printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
+                printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - "
+                                "Aborting request!\n");
                 idetape_end_request(drive, 0, 0);
         }
         return ide_stopped;
 }
 
-static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
+static void idetape_create_request_sense_cmd(idetape_pc_t *pc)
 {
-        idetape_init_pc(pc);    
+        idetape_init_pc(pc);
         pc->c[0] = REQUEST_SENSE;
         pc->c[4] = 20;
         pc->request_transfer = 20;
@@ -1086,25 +955,22 @@ static void idetape_init_rq(struct request *rq, u8 cmd)
 }
 
 /*
- *      idetape_queue_pc_head generates a new packet command request in front
- *      of the request queue, before the current request, so that it will be
- *      processed immediately, on the next pass through the driver.
- *
- *      idetape_queue_pc_head is called from the request handling part of
- *      the driver (the "bottom" part). Safe storage for the request should
- *      be allocated with idetape_next_pc_storage and idetape_next_rq_storage
- *      before calling idetape_queue_pc_head.
+ * Generate a new packet command request in front of the request queue, before
+ * the current request, so that it will be processed immediately, on the next
+ * pass through the driver. The function below is called from the request
+ * handling part of the driver (the "bottom" part). Safe storage for the request
+ * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
  *
- *      Memory for those requests is pre-allocated at initialization time, and
- *      is limited to IDETAPE_PC_STACK requests. We assume that we have enough
- *      space for the maximum possible number of inter-dependent packet commands.
+ * Memory for those requests is pre-allocated at initialization time, and is
+ * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
+ * the maximum possible number of inter-dependent packet commands.
  *
- *      The higher level of the driver - The ioctl handler and the character
- *      device handling functions should queue request to the lower level part
- *      and wait for their completion using idetape_queue_pc_tail or
- *      idetape_queue_rw_tail.
+ * The higher level of the driver - The ioctl handler and the character device
+ * handling functions should queue request to the lower level part and wait for
+ * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
  */
-static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
+static void idetape_queue_pc_head(ide_drive_t *drive, idetape_pc_t *pc,
+                                  struct request *rq)
 {
         struct ide_tape_obj *tape = drive->driver_data;
 
@@ -1125,7 +991,7 @@ static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
         idetape_pc_t *pc;
         struct request *rq;
 
-        (void)drive->hwif->INB(IDE_ERROR_REG);
+        (void)ide_read_error(drive);
         pc = idetape_next_pc_storage(drive);
         rq = idetape_next_rq_storage(drive);
         idetape_create_request_sense_cmd(pc);
@@ -1135,50 +1001,46 @@ static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
 }
 
 /*
- *      idetape_postpone_request postpones the current request so that
- *      ide.c will be able to service requests from another device on
- *      the same hwgroup while we are polling for DSC.
+ * Postpone the current request so that ide.c will be able to service requests
+ * from another device on the same hwgroup while we are polling for DSC.
  */
-static void idetape_postpone_request (ide_drive_t *drive)
+static void idetape_postpone_request(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
-#endif
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
+
         tape->postponed_rq = HWGROUP(drive)->rq;
-        ide_stall_queue(drive, tape->dsc_polling_frequency);
+        ide_stall_queue(drive, tape->dsc_poll_freq);
 }
 
+typedef void idetape_io_buf(ide_drive_t *, idetape_pc_t *, unsigned int);
+
 /*
- *      idetape_pc_intr is the usual interrupt handler which will be called
- *      during a packet command. We will transfer some of the data (as
- *      requested by the drive) and will re-point interrupt handler to us.
- *      When data transfer is finished, we will act according to the
- *      algorithm described before idetape_issue_packet_command.
- *
+ * This is the usual interrupt handler which will be called during a packet
+ * command. We will transfer some of the data (as requested by the drive) and
+ * will re-point interrupt handler to us. When data transfer is finished, we
+ * will act according to the algorithm described before
+ * idetape_issue_pc.
  */
-static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
+static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t *pc = tape->pc;
+        xfer_func_t *xferfunc;
+        idetape_io_buf *iobuf;
         unsigned int temp;
 #if SIMULATE_ERRORS
-        static int error_sim_count = 0;
+        static int error_sim_count;
 #endif
         u16 bcount;
         u8 stat, ireason;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
-                                "interrupt handler\n");
-#endif /* IDETAPE_DEBUG_LOG */  
+        debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
 
         /* Clear the interrupt */
-        stat = hwif->INB(IDE_STATUS_REG);
+        stat = ide_read_status(drive);
 
         if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
                 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
@@ -1208,20 +1070,16 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
                         pc->actually_transferred = pc->request_transfer;
                         idetape_update_buffers(pc);
                 }
-#if IDETAPE_DEBUG_LOG
-                if (tape->debug_level >= 4)
-                        printk(KERN_INFO "ide-tape: DMA finished\n");
-#endif /* IDETAPE_DEBUG_LOG */
+                debug_log(DBG_PROCS, "DMA finished\n");
+
         }
 
         /* No more interrupts */
         if ((stat & DRQ_STAT) == 0) {
-#if IDETAPE_DEBUG_LOG
-                if (tape->debug_level >= 2)
-                        printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
-#endif /* IDETAPE_DEBUG_LOG */
-                clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
+                debug_log(DBG_SENSE, "Packet command completed, %d bytes"
+                                " transferred\n", pc->actually_transferred);
 
+                clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
                 local_irq_enable();
 
 #if SIMULATE_ERRORS
@@ -1236,19 +1094,16 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
                         stat &= ~ERR_STAT;
                 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
                         /* Error detected */
-#if IDETAPE_DEBUG_LOG
-                        if (tape->debug_level >= 1)
-                                printk(KERN_INFO "ide-tape: %s: I/O error\n",
-                                        tape->name);
-#endif /* IDETAPE_DEBUG_LOG */
+                        debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
+
                         if (pc->c[0] == REQUEST_SENSE) {
-                                printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
+                                printk(KERN_ERR "ide-tape: I/O error in request"
+                                                " sense command\n");
                                 return ide_do_reset(drive);
                         }
-#if IDETAPE_DEBUG_LOG
-                        if (tape->debug_level >= 1)
-                                printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
-#endif
+                        debug_log(DBG_ERR, "[cmd %x]: check condition\n",
+                                        pc->c[0]);
+
                         /* Retry operation */
                         return idetape_retry_pc(drive);
                 }
@@ -1257,7 +1112,7 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
                     (stat & SEEK_STAT) == 0) {
                         /* Media access command */
                         tape->dsc_polling_start = jiffies;
-                        tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
+                        tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
                         tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
                         /* Allow ide.c to handle other requests */
                         idetape_postpone_request(drive);
@@ -1282,7 +1137,7 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
         ireason = hwif->INB(IDE_IREASON_REG);
 
         if (ireason & CD) {
-                printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
+                printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
                 return ide_do_reset(drive);
         }
         if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
@@ -1298,86 +1153,76 @@ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
                 temp = pc->actually_transferred + bcount;
                 if (temp > pc->request_transfer) {
                         if (temp > pc->buffer_size) {
-                                printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
+                                printk(KERN_ERR "ide-tape: The tape wants to "
+                                        "send us more data than expected "
+                                        "- discarding data\n");
                                 idetape_discard_data(drive, bcount);
-                                ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
+                                ide_set_handler(drive, &idetape_pc_intr,
+                                                IDETAPE_WAIT_CMD, NULL);
                                 return ide_started;
                         }
-#if IDETAPE_DEBUG_LOG
-                        if (tape->debug_level >= 2)
-                                printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
-#endif /* IDETAPE_DEBUG_LOG */
+                        debug_log(DBG_SENSE, "The tape wants to send us more "
+                                "data than expected - allowing transfer\n");
                 }
-        }
-        if (test_bit(PC_WRITING, &pc->flags)) {
-                if (pc->bh != NULL)
-                        idetape_output_buffers(drive, pc, bcount);
-                else
-                        /* Write the current buffer */
-                        hwif->atapi_output_bytes(drive, pc->current_position,
-                                                 bcount);
+                iobuf = &idetape_input_buffers;
+                xferfunc = hwif->atapi_input_bytes;
         } else {
-                if (pc->bh != NULL)
-                        idetape_input_buffers(drive, pc, bcount);
-                else
-                        /* Read the current buffer */
-                        hwif->atapi_input_bytes(drive, pc->current_position,
-                                                bcount);
+                iobuf = &idetape_output_buffers;
+                xferfunc = hwif->atapi_output_bytes;
         }
+
+        if (pc->bh)
+                iobuf(drive, pc, bcount);
+        else
+                xferfunc(drive, pc->current_position, bcount);
+
         /* Update the current position */
         pc->actually_transferred += bcount;
         pc->current_position += bcount;
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 2)
-                printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes "
-                                 "on that interrupt\n", pc->c[0], bcount);
-#endif
+
+        debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
+                        pc->c[0], bcount);
+
         /* And set the interrupt handler again */
         ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
         return ide_started;
 }
 
 /*
- *      Packet Command Interface
- *
- *      The current Packet Command is available in tape->pc, and will not
- *      change until we finish handling it. Each packet command is associated
- *      with a callback function that will be called when the command is
- *      finished.
+ * Packet Command Interface
  *
- *      The handling will be done in three stages:
+ * The current Packet Command is available in tape->pc, and will not change
+ * until we finish handling it. Each packet command is associated with a
+ * callback function that will be called when the command is finished.
  *
- *      1.      idetape_issue_packet_command will send the packet command to the
- *              drive, and will set the interrupt handler to idetape_pc_intr.
+ * The handling will be done in three stages:
  *
- *      2.      On each interrupt, idetape_pc_intr will be called. This step
- *              will be repeated until the device signals us that no more
- *              interrupts will be issued.
+ * 1. idetape_issue_pc will send the packet command to the drive, and will set
+ * the interrupt handler to idetape_pc_intr.
  *
- *      3.      ATAPI Tape media access commands have immediate status with a
- *              delayed process. In case of a successful initiation of a
- *              media access packet command, the DSC bit will be set when the
- *              actual execution of the command is finished. 
- *              Since the tape drive will not issue an interrupt, we have to
- *              poll for this event. In this case, we define the request as
- *              "low priority request" by setting rq_status to
- *              IDETAPE_RQ_POSTPONED,   set a timer to poll for DSC and exit
- *              the driver.
+ * 2. On each interrupt, idetape_pc_intr will be called. This step will be
+ * repeated until the device signals us that no more interrupts will be issued.
  *
- *              ide.c will then give higher priority to requests which
- *              originate from the other device, until will change rq_status
- *              to RQ_ACTIVE.
+ * 3. ATAPI Tape media access commands have immediate status with a delayed
+ * process. In case of a successful initiation of a media access packet command,
+ * the DSC bit will be set when the actual execution of the command is finished.
+ * Since the tape drive will not issue an interrupt, we have to poll for this
+ * event. In this case, we define the request as "low priority request" by
+ * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
+ * exit the driver.
  *
- *      4.      When the packet command is finished, it will be checked for errors.
+ * ide.c will then give higher priority to requests which originate from the
+ * other device, until will change rq_status to RQ_ACTIVE.
  *
- *      5.      In case an error was found, we queue a request sense packet
- *              command in front of the request queue and retry the operation
- *              up to IDETAPE_MAX_PC_RETRIES times.
+ * 4. When the packet command is finished, it will be checked for errors.
  *
- *      6.      In case no error was found, or we decided to give up and not
- *              to retry again, the callback function will be called and then
- *              we will handle the next request.
+ * 5. In case an error was found, we queue a request sense packet command in
+ * front of the request queue and retry the operation up to
+ * IDETAPE_MAX_PC_RETRIES times.
  *
+ * 6. In case no error was found, or we decided to give up and not to retry
+ * again, the callback function will be called and then we will handle the next
+ * request.
  */
 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
 {
@@ -1388,8 +1233,9 @@ static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
         ide_startstop_t startstop;
         u8 ireason;
 
-        if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
-                printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
+        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
+                printk(KERN_ERR "ide-tape: Strange, packet command initiated "
+                                "yet DRQ isn't asserted\n");
                 return startstop;
         }
         ireason = hwif->INB(IDE_IREASON_REG);
@@ -1422,7 +1268,7 @@ static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
         return ide_started;
 }
 
-static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
+static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, idetape_pc_t *pc)
 {
         ide_hwif_t *hwif = drive->hwif;
         idetape_tape_t *tape = drive->driver_data;
@@ -1443,9 +1289,9 @@ static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape
         if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
             test_bit(PC_ABORT, &pc->flags)) {
                 /*
-                 *      We will "abort" retrying a packet command in case
-                 *      a legitimate error code was received (crossing a
-                 *      filemark, or end of the media, for example).
+                 * We will "abort" retrying a packet command in case legitimate
+                 * error code was received (crossing a filemark, or end of the
+                 * media, for example).
                  */
                 if (!test_bit(PC_ABORT, &pc->flags)) {
                         if (!(pc->c[0] == TEST_UNIT_READY &&
@@ -1464,10 +1310,7 @@ static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape
                 tape->failed_pc = NULL;
                 return pc->callback(drive);
         }
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 2)
-                printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
 
         pc->retries++;
         /* We haven't transferred any data yet */
@@ -1499,31 +1342,24 @@ static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape
         }
 }
 
-/*
- *      General packet command callback function.
- */
-static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
+static ide_startstop_t idetape_pc_callback(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
-        
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
+
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
         idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
         return ide_stopped;
 }
 
-/*
- *      A mode sense command is used to "sense" tape parameters.
- */
-static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
+/* A mode sense command is used to "sense" tape parameters. */
+static void idetape_create_mode_sense_cmd(idetape_pc_t *pc, u8 page_code)
 {
         idetape_init_pc(pc);
         pc->c[0] = MODE_SENSE;
         if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
-                pc->c[1] = 8;   /* DBD = 1 - Don't return block descriptors */
+                /* DBD = 1 - Don't return block descriptors */
+                pc->c[1] = 8;
         pc->c[2] = page_code;
         /*
          * Changed pc->c[3] to 0 (255 will at best return unused info).
@@ -1533,7 +1369,8 @@ static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
          * and return an error when 255 is used.
          */
         pc->c[3] = 0;
-        pc->c[4] = 255;         /* (We will just discard data in that case) */
+        /* We will just discard data in that case */
+        pc->c[4] = 255;
         if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
                 pc->request_transfer = 12;
         else if (page_code == IDETAPE_CAPABILITIES_PAGE)
@@ -1543,62 +1380,77 @@ static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
         pc->callback = &idetape_pc_callback;
 }
 
-static void calculate_speeds(ide_drive_t *drive)
+static void idetape_calculate_speeds(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
-        int full = 125, empty = 75;
 
-        if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
-                tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
-                tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
+        if (time_after(jiffies,
+                        tape->controlled_pipeline_head_time + 120 * HZ)) {
+                tape->controlled_previous_pipeline_head =
+                        tape->controlled_last_pipeline_head;
+                tape->controlled_previous_head_time =
+                        tape->controlled_pipeline_head_time;
                 tape->controlled_last_pipeline_head = tape->pipeline_head;
                 tape->controlled_pipeline_head_time = jiffies;
         }
         if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
-                tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
+                tape->controlled_pipeline_head_speed = (tape->pipeline_head -
+                                tape->controlled_last_pipeline_head) * 32 * HZ /
+                                (jiffies - tape->controlled_pipeline_head_time);
         else if (time_after(jiffies, tape->controlled_previous_head_time))
-                tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
+                tape->controlled_pipeline_head_speed = (tape->pipeline_head -
+                                tape->controlled_previous_pipeline_head) * 32 *
+                        HZ / (jiffies - tape->controlled_previous_head_time);
 
-        if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
+        if (tape->nr_pending_stages < tape->max_stages/*- 1 */) {
                 /* -1 for read mode error recovery */
-                if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
+                if (time_after(jiffies, tape->uncontrolled_previous_head_time +
+                                        10 * HZ)) {
                         tape->uncontrolled_pipeline_head_time = jiffies;
-                        tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
+                        tape->uncontrolled_pipeline_head_speed =
+                                (tape->pipeline_head -
+                                 tape->uncontrolled_previous_pipeline_head) *
+                                32 * HZ / (jiffies -
+                                        tape->uncontrolled_previous_head_time);
                 }
         } else {
                 tape->uncontrolled_previous_head_time = jiffies;
                 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
-                if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
+                if (time_after(jiffies, tape->uncontrolled_pipeline_head_time +
+                                        30 * HZ))
                         tape->uncontrolled_pipeline_head_time = jiffies;
-                }
+
         }
-        tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
-        if (tape->speed_control == 0) {
-                tape->max_insert_speed = 5000;
-        } else if (tape->speed_control == 1) {
+        tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed,
+                                        tape->controlled_pipeline_head_speed);
+
+        if (tape->speed_control == 1) {
                 if (tape->nr_pending_stages >= tape->max_stages / 2)
                         tape->max_insert_speed = tape->pipeline_head_speed +
-                                (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
+                                (1100 - tape->pipeline_head_speed) * 2 *
+                                (tape->nr_pending_stages - tape->max_stages / 2)
+                                / tape->max_stages;
                 else
                         tape->max_insert_speed = 500 +
-                                (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
+                                (tape->pipeline_head_speed - 500) * 2 *
+                                tape->nr_pending_stages / tape->max_stages;
+
                 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
                         tape->max_insert_speed = 5000;
-        } else if (tape->speed_control == 2) {
-                tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
-                        (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
         } else
                 tape->max_insert_speed = tape->speed_control;
+
         tape->max_insert_speed = max(tape->max_insert_speed, 500);
 }
 
-static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
+static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t *pc = tape->pc;
         u8 stat;
 
-        stat = drive->hwif->INB(IDE_STATUS_REG);
+        stat = ide_read_status(drive);
+
         if (stat & SEEK_STAT) {
                 if (stat & ERR_STAT) {
                         /* Error detected */
@@ -1618,14 +1470,14 @@ static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
         return pc->callback(drive);
 }
 
-static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
+static ide_startstop_t idetape_rw_callback(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         struct request *rq = HWGROUP(drive)->rq;
-        int blocks = tape->pc->actually_transferred / tape->tape_block_size;
+        int blocks = tape->pc->actually_transferred / tape->blk_size;
 
-        tape->avg_size += blocks * tape->tape_block_size;
-        tape->insert_size += blocks * tape->tape_block_size;
+        tape->avg_size += blocks * tape->blk_size;
+        tape->insert_size += blocks * tape->blk_size;
         if (tape->insert_size > 1024 * 1024)
                 tape->measure_insert_time = 1;
         if (tape->measure_insert_time) {
@@ -1634,19 +1486,17 @@ static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
                 tape->insert_size = 0;
         }
         if (time_after(jiffies, tape->insert_time))
-                tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
+                tape->insert_speed = tape->insert_size / 1024 * HZ /
+                                        (jiffies - tape->insert_time);
         if (time_after_eq(jiffies, tape->avg_time + HZ)) {
-                tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
+                tape->avg_speed = tape->avg_size * HZ /
+                                (jiffies - tape->avg_time) / 1024;
                 tape->avg_size = 0;
                 tape->avg_time = jiffies;
         }
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
-#if IDETAPE_DEBUG_LOG   
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
-        tape->first_frame_position += blocks;
+        tape->first_frame += blocks;
         rq->current_nr_sectors -= blocks;
 
         if (!tape->pc->error)
@@ -1656,7 +1506,8 @@ static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
         return ide_stopped;
 }
 
-static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
+static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc,
+                unsigned int length, struct idetape_bh *bh)
 {
         idetape_init_pc(pc);
         pc->c[0] = READ_6;
@@ -1666,12 +1517,14 @@ static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsi
         pc->bh = bh;
         atomic_set(&bh->b_count, 0);
         pc->buffer = NULL;
-        pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
+        pc->buffer_size = length * tape->blk_size;
+        pc->request_transfer = pc->buffer_size;
         if (pc->request_transfer == tape->stage_size)
                 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
 }
 
-static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
+static void idetape_create_read_buffer_cmd(idetape_tape_t *tape,
+                idetape_pc_t *pc, struct idetape_bh *bh)
 {
         int size = 32768;
         struct idetape_bh *p = bh;
@@ -1689,10 +1542,12 @@ static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *p
                 atomic_set(&p->b_count, 0);
                 p = p->b_reqnext;
         }
-        pc->request_transfer = pc->buffer_size = size;
+        pc->request_transfer = size;
+        pc->buffer_size = size;
 }
 
-static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
+static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc,
+                unsigned int length, struct idetape_bh *bh)
 {
         idetape_init_pc(pc);
         pc->c[0] = WRITE_6;
@@ -1704,14 +1559,12 @@ static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, uns
         pc->b_data = bh->b_data;
         pc->b_count = atomic_read(&bh->b_count);
         pc->buffer = NULL;
-        pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
+        pc->buffer_size = length * tape->blk_size;
+        pc->request_transfer = pc->buffer_size;
         if (pc->request_transfer == tape->stage_size)
                 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
 }
 
-/*
- * idetape_do_request is our request handling function. 
- */
 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
                                           struct request *rq, sector_t block)
 {
@@ -1720,30 +1573,22 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
         struct request *postponed_rq = tape->postponed_rq;
         u8 stat;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 2)
-                printk(KERN_INFO "ide-tape: sector: %ld, "
-                        "nr_sectors: %ld, current_nr_sectors: %d\n",
+        debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
+                        " current_nr_sectors: %d\n",
                         rq->sector, rq->nr_sectors, rq->current_nr_sectors);
-#endif /* IDETAPE_DEBUG_LOG */
 
         if (!blk_special_request(rq)) {
-                /*
-                 * We do not support buffer cache originated requests.
-                 */
+                /* We do not support buffer cache originated requests. */
                 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
                         "request queue (%d)\n", drive->name, rq->cmd_type);
                 ide_end_request(drive, 0, 0);
                 return ide_stopped;
         }
 
-        /*
-         *      Retry a failed packet command
-         */
-        if (tape->failed_pc != NULL &&
-            tape->pc->c[0] == REQUEST_SENSE) {
-                return idetape_issue_packet_command(drive, tape->failed_pc);
-        }
+        /* Retry a failed packet command */
+        if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE)
+                return idetape_issue_pc(drive, tape->failed_pc);
+
         if (postponed_rq != NULL)
                 if (rq != postponed_rq) {
                         printk(KERN_ERR "ide-tape: ide-tape.c bug - "
@@ -1758,7 +1603,7 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
          * If the tape is still busy, postpone our request and service
          * the other device meanwhile.
          */
-        stat = drive->hwif->INB(IDE_STATUS_REG);
+        stat = ide_read_status(drive);
 
         if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
                 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
@@ -1768,16 +1613,15 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
                 drive->post_reset = 0;
         }
 
-        if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
-                tape->measure_insert_time = 1;
         if (time_after(jiffies, tape->insert_time))
-                tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
-        calculate_speeds(drive);
+                tape->insert_speed = tape->insert_size / 1024 * HZ /
+                                        (jiffies - tape->insert_time);
+        idetape_calculate_speeds(drive);
         if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
             (stat & SEEK_STAT) == 0) {
                 if (postponed_rq == NULL) {
                         tape->dsc_polling_start = jiffies;
-                        tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
+                        tape->dsc_poll_freq = tape->best_dsc_rw_freq;
                         tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
                 } else if (time_after(jiffies, tape->dsc_timeout)) {
                         printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
@@ -1788,8 +1632,10 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
                         } else {
                                 return ide_do_reset(drive);
                         }
-                } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
-                        tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
+                } else if (time_after(jiffies,
+                                        tape->dsc_polling_start +
+                                        IDETAPE_DSC_MA_THRESHOLD))
+                        tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
                 idetape_postpone_request(drive);
                 return ide_stopped;
         }
@@ -1797,20 +1643,23 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
                 tape->buffer_head++;
                 tape->postpone_cnt = 0;
                 pc = idetape_next_pc_storage(drive);
-                idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
+                idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
+                                        (struct idetape_bh *)rq->special);
                 goto out;
         }
         if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
                 tape->buffer_head++;
                 tape->postpone_cnt = 0;
                 pc = idetape_next_pc_storage(drive);
-                idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
+                idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
+                                         (struct idetape_bh *)rq->special);
                 goto out;
         }
         if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
                 tape->postpone_cnt = 0;
                 pc = idetape_next_pc_storage(drive);
-                idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
+                idetape_create_read_buffer_cmd(tape, pc,
+                                (struct idetape_bh *)rq->special);
                 goto out;
         }
         if (rq->cmd[0] & REQ_IDETAPE_PC1) {
@@ -1825,49 +1674,51 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
         }
         BUG();
 out:
-        return idetape_issue_packet_command(drive, pc);
+        return idetape_issue_pc(drive, pc);
 }
 
-/*
- *      Pipeline related functions
- */
-static inline int idetape_pipeline_active (idetape_tape_t *tape)
+/* Pipeline related functions */
+static inline int idetape_pipeline_active(idetape_tape_t *tape)
 {
         int rc1, rc2;
 
         rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
-        rc2 = (tape->active_data_request != NULL);
+        rc2 = (tape->active_data_rq != NULL);
         return rc1;
 }
 
 /*
- *      idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
- *      stage, along with all the necessary small buffers which together make
- *      a buffer of size tape->stage_size (or a bit more). We attempt to
- *      combine sequential pages as much as possible.
+ * The function below uses __get_free_page to allocate a pipeline stage, along
+ * with all the necessary small buffers which together make a buffer of size
+ * tape->stage_size (or a bit more). We attempt to combine sequential pages as
+ * much as possible.
  *
- *      Returns a pointer to the new allocated stage, or NULL if we
- *      can't (or don't want to) allocate a stage.
+ * It returns a pointer to the new allocated stage, or NULL if we can't (or
+ * don't want to) allocate a stage.
  *
- *      Pipeline stages are optional and are used to increase performance.
- *      If we can't allocate them, we'll manage without them.
+ * Pipeline stages are optional and are used to increase performance. If we
+ * can't allocate them, we'll manage without them.
  */
-static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
+static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full,
+                                                int clear)
 {
         idetape_stage_t *stage;
         struct idetape_bh *prev_bh, *bh;
         int pages = tape->pages_per_stage;
         char *b_data = NULL;
 
-        if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
+        stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL);
+        if (!stage)
                 return NULL;
         stage->next = NULL;
 
-        bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
+        stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
+        bh = stage->bh;
         if (bh == NULL)
                 goto abort;
         bh->b_reqnext = NULL;
-        if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
+        bh->b_data = (char *) __get_free_page(GFP_KERNEL);
+        if (!bh->b_data)
                 goto abort;
         if (clear)
                 memset(bh->b_data, 0, PAGE_SIZE);
@@ -1875,7 +1726,8 @@ static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full,
         atomic_set(&bh->b_count, full ? bh->b_size : 0);
 
         while (--pages) {
-                if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
+                b_data = (char *) __get_free_page(GFP_KERNEL);
+                if (!b_data)
                         goto abort;
                 if (clear)
                         memset(b_data, 0, PAGE_SIZE);
@@ -1893,7 +1745,8 @@ static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full,
                         continue;
                 }
                 prev_bh = bh;
-                if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
+                bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
+                if (!bh) {
                         free_page((unsigned long) b_data);
                         goto abort;
                 }
@@ -1912,14 +1765,11 @@ abort:
         return NULL;
 }
 
-static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
+static idetape_stage_t *idetape_kmalloc_stage(idetape_tape_t *tape)
 {
         idetape_stage_t *cache_stage = tape->cache_stage;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
         if (tape->nr_stages >= tape->max_stages)
                 return NULL;
@@ -1930,7 +1780,8 @@ static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
         return __idetape_kmalloc_stage(tape, 0, 0);
 }
 
-static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
+static int idetape_copy_stage_from_user(idetape_tape_t *tape,
+                idetape_stage_t *stage, const char __user *buf, int n)
 {
         struct idetape_bh *bh = tape->bh;
         int count;
@@ -1938,12 +1789,15 @@ static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *
 
         while (n) {
                 if (bh == NULL) {
-                        printk(KERN_ERR "ide-tape: bh == NULL in "
-                                "idetape_copy_stage_from_user\n");
+                        printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
+                                        __func__);
                         return 1;
                 }
-                count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
-                if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
+                count = min((unsigned int)
+                                (bh->b_size - atomic_read(&bh->b_count)),
+                                (unsigned int)n);
+                if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
+                                count))
                         ret = 1;
                 n -= count;
                 atomic_add(count, &bh->b_count);
@@ -1958,7 +1812,8 @@ static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *
         return ret;
 }
 
-static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
+static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
+                idetape_stage_t *stage, int n)
 {
         struct idetape_bh *bh = tape->bh;
         int count;
@@ -1966,8 +1821,8 @@ static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, i
 
         while (n) {
                 if (bh == NULL) {
-                        printk(KERN_ERR "ide-tape: bh == NULL in "
-                                "idetape_copy_stage_to_user\n");
+                        printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
+                                        __func__);
                         return 1;
                 }
                 count = min(tape->b_count, n);
@@ -1978,7 +1833,8 @@ static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, i
                 tape->b_count -= count;
                 buf += count;
                 if (!tape->b_count) {
-                        tape->bh = bh = bh->b_reqnext;
+                        bh = bh->b_reqnext;
+                        tape->bh = bh;
                         if (bh) {
                                 tape->b_data = bh->b_data;
                                 tape->b_count = atomic_read(&bh->b_count);
@@ -1988,12 +1844,12 @@ static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, i
         return ret;
 }
 
-static void idetape_init_merge_stage (idetape_tape_t *tape)
+static void idetape_init_merge_stage(idetape_tape_t *tape)
 {
         struct idetape_bh *bh = tape->merge_stage->bh;
-        
+
         tape->bh = bh;
-        if (tape->chrdev_direction == idetape_direction_write)
+        if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
                 atomic_set(&bh->b_count, 0);
         else {
                 tape->b_data = bh->b_data;
@@ -2001,7 +1857,7 @@ static void idetape_init_merge_stage (idetape_tape_t *tape)
         }
 }
 
-static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
+static void idetape_switch_buffers(idetape_tape_t *tape, idetape_stage_t *stage)
 {
         struct idetape_bh *tmp;
 
@@ -2011,87 +1867,76 @@ static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage
         idetape_init_merge_stage(tape);
 }
 
-/*
- *      idetape_add_stage_tail adds a new stage at the end of the pipeline.
- */
-static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
+/* Add a new stage at the end of the pipeline. */
+static void idetape_add_stage_tail(ide_drive_t *drive, idetape_stage_t *stage)
 {
         idetape_tape_t *tape = drive->driver_data;
         unsigned long flags;
-        
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
-#endif /* IDETAPE_DEBUG_LOG */
-        spin_lock_irqsave(&tape->spinlock, flags);
+
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
+
+        spin_lock_irqsave(&tape->lock, flags);
         stage->next = NULL;
         if (tape->last_stage != NULL)
-                tape->last_stage->next=stage;
+                tape->last_stage->next = stage;
         else
-                tape->first_stage = tape->next_stage=stage;
+                tape->first_stage = stage;
+                tape->next_stage  = stage;
         tape->last_stage = stage;
         if (tape->next_stage == NULL)
                 tape->next_stage = tape->last_stage;
         tape->nr_stages++;
         tape->nr_pending_stages++;
-        spin_unlock_irqrestore(&tape->spinlock, flags);
+        spin_unlock_irqrestore(&tape->lock, flags);
 }
 
-/*
- *      idetape_wait_for_request installs a completion in a pending request
- *      and sleeps until it is serviced.
- *
- *      The caller should ensure that the request will not be serviced
- *      before we install the completion (usually by disabling interrupts).
+/* Install a completion in a pending request and sleep until it is serviced. The
+ * caller should ensure that the request will not be serviced before we install
+ * the completion (usually by disabling interrupts).
  */
-static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
+static void idetape_wait_for_request(ide_drive_t *drive, struct request *rq)
 {
         DECLARE_COMPLETION_ONSTACK(wait);
         idetape_tape_t *tape = drive->driver_data;
 
         if (rq == NULL || !blk_special_request(rq)) {
-                printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
+                printk(KERN_ERR "ide-tape: bug: Trying to sleep on non-valid"
+                                 " request\n");
                 return;
         }
         rq->end_io_data = &wait;
         rq->end_io = blk_end_sync_rq;
-        spin_unlock_irq(&tape->spinlock);
+        spin_unlock_irq(&tape->lock);
         wait_for_completion(&wait);
         /* The stage and its struct request have been deallocated */
-        spin_lock_irq(&tape->spinlock);
+        spin_lock_irq(&tape->lock);
 }
 
-static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
+static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
-        idetape_read_position_result_t *result;
-        
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        u8 *readpos = tape->pc->buffer;
+
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
         if (!tape->pc->error) {
-                result = (idetape_read_position_result_t *) tape->pc->buffer;
-#if IDETAPE_DEBUG_LOG
-                if (tape->debug_level >= 2)
-                        printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
-                if (tape->debug_level >= 2)
-                        printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
-#endif /* IDETAPE_DEBUG_LOG */
-                if (result->bpu) {
-                        printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
+                debug_log(DBG_SENSE, "BOP - %s\n",
+                                (readpos[0] & 0x80) ? "Yes" : "No");
+                debug_log(DBG_SENSE, "EOP - %s\n",
+                                (readpos[0] & 0x40) ? "Yes" : "No");
+
+                if (readpos[0] & 0x4) {
+                        printk(KERN_INFO "ide-tape: Block location is unknown"
+                                         "to the tape\n");
                         clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
                         idetape_end_request(drive, 0, 0);
                 } else {
-#if IDETAPE_DEBUG_LOG
-                        if (tape->debug_level >= 2)
-                                printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
-#endif /* IDETAPE_DEBUG_LOG */
-                        tape->partition = result->partition;
-                        tape->first_frame_position = ntohl(result->first_block);
-                        tape->last_frame_position = ntohl(result->last_block);
-                        tape->blocks_in_buffer = result->blocks_in_buffer[2];
+                        debug_log(DBG_SENSE, "Block Location - %u\n",
+                                        be32_to_cpu(*(u32 *)&readpos[4]));
+
+                        tape->partition = readpos[1];
+                        tape->first_frame =
+                                be32_to_cpu(*(u32 *)&readpos[4]);
                         set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
                         idetape_end_request(drive, 1, 0);
                 }
@@ -2102,14 +1947,11 @@ static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
 }
 
 /*
- *      idetape_create_write_filemark_cmd will:
- *
- *              1.      Write a filemark if write_filemark=1.
- *              2.      Flush the device buffers without writing a filemark
- *                      if write_filemark=0.
- *
+ * Write a filemark if write_filemark=1. Flush the device buffers without
+ * writing a filemark otherwise.
  */
-static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
+static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
+                idetape_pc_t *pc, int write_filemark)
 {
         idetape_init_pc(pc);
         pc->c[0] = WRITE_FILEMARKS;
@@ -2126,26 +1968,19 @@ static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
 }
 
 /*
- *      idetape_queue_pc_tail is based on the following functions:
- *
- *      ide_do_drive_cmd from ide.c
- *      cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
+ * We add a special packet command request to the tail of the request queue, and
+ * wait for it to be serviced. This is not to be called from within the request
+ * handling part of the driver! We allocate here data on the stack and it is
+ * valid until the request is finished. This is not the case for the bottom part
+ * of the driver, where we are always leaving the functions to wait for an
+ * interrupt or a timer event.
  *
- *      We add a special packet command request to the tail of the request
- *      queue, and wait for it to be serviced.
- *
- *      This is not to be called from within the request handling part
- *      of the driver ! We allocate here data in the stack, and it is valid
- *      until the request is finished. This is not the case for the bottom
- *      part of the driver, where we are always leaving the functions to wait
- *      for an interrupt or a timer event.
- *
- *      From the bottom part of the driver, we should allocate safe memory
- *      using idetape_next_pc_storage and idetape_next_rq_storage, and add
- *      the request to the request list without waiting for it to be serviced !
- *      In that case, we usually use idetape_queue_pc_head.
+ * From the bottom part of the driver, we should allocate safe memory using
+ * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
+ * to the request list without waiting for it to be serviced! In that case, we
+ * usually use idetape_queue_pc_head().
  */
-static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
+static int __idetape_queue_pc_tail(ide_drive_t *drive, idetape_pc_t *pc)
 {
         struct ide_tape_obj *tape = drive->driver_data;
         struct request rq;
@@ -2156,7 +1991,8 @@ static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
         return ide_do_drive_cmd(drive, &rq, ide_wait);
 }
 
-static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
+static void idetape_create_load_unload_cmd(ide_drive_t *drive, idetape_pc_t *pc,
+                int cmd)
 {
         idetape_init_pc(pc);
         pc->c[0] = START_STOP;
@@ -2171,9 +2007,7 @@ static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
         idetape_pc_t pc;
         int load_attempted = 0;
 
-        /*
-         * Wait for the tape to become ready
-         */
+        /* Wait for the tape to become ready */
         set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
         timeout += jiffies;
         while (time_before(jiffies, timeout)) {
@@ -2181,10 +2015,12 @@ static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
                 if (!__idetape_queue_pc_tail(drive, &pc))
                         return 0;
                 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
-                    || (tape->asc == 0x3A)) {   /* no media */
+                    || (tape->asc == 0x3A)) {
+                        /* no media */
                         if (load_attempted)
                                 return -ENOMEDIUM;
-                        idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
+                        idetape_create_load_unload_cmd(drive, &pc,
+                                                        IDETAPE_LU_LOAD_MASK);
                         __idetape_queue_pc_tail(drive, &pc);
                         load_attempted = 1;
                 /* not about to be ready */
@@ -2196,24 +2032,25 @@ static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
         return -EIO;
 }
 
-static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
+static int idetape_queue_pc_tail(ide_drive_t *drive, idetape_pc_t *pc)
 {
         return __idetape_queue_pc_tail(drive, pc);
 }
 
-static int idetape_flush_tape_buffers (ide_drive_t *drive)
+static int idetape_flush_tape_buffers(ide_drive_t *drive)
 {
         idetape_pc_t pc;
         int rc;
 
         idetape_create_write_filemark_cmd(drive, &pc, 0);
-        if ((rc = idetape_queue_pc_tail(drive, &pc)))
+        rc = idetape_queue_pc_tail(drive, &pc);
+        if (rc)
                 return rc;
         idetape_wait_ready(drive, 60 * 5 * HZ);
         return 0;
 }
 
-static void idetape_create_read_position_cmd (idetape_pc_t *pc)
+static void idetape_create_read_position_cmd(idetape_pc_t *pc)
 {
         idetape_init_pc(pc);
         pc->c[0] = READ_POSITION;
@@ -2221,25 +2058,23 @@ static void idetape_create_read_position_cmd (idetape_pc_t *pc)
         pc->callback = &idetape_read_position_callback;
 }
 
-static int idetape_read_position (ide_drive_t *drive)
+static int idetape_read_position(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t pc;
         int position;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
 
         idetape_create_read_position_cmd(&pc);
         if (idetape_queue_pc_tail(drive, &pc))
                 return -1;
-        position = tape->first_frame_position;
+        position = tape->first_frame;
         return position;
 }
 
-static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
+static void idetape_create_locate_cmd(ide_drive_t *drive, idetape_pc_t *pc,
+                unsigned int block, u8 partition, int skip)
 {
         idetape_init_pc(pc);
         pc->c[0] = POSITION_TO_ELEMENT;
@@ -2250,7 +2085,8 @@ static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, uns
         pc->callback = &idetape_pc_callback;
 }
 
-static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
+static int idetape_create_prevent_cmd(ide_drive_t *drive, idetape_pc_t *pc,
+                                      int prevent)
 {
         idetape_tape_t *tape = drive->driver_data;
 
@@ -2265,17 +2101,17 @@ static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int
         return 1;
 }
 
-static int __idetape_discard_read_pipeline (ide_drive_t *drive)
+static int __idetape_discard_read_pipeline(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         unsigned long flags;
         int cnt;
 
-        if (tape->chrdev_direction != idetape_direction_read)
+        if (tape->chrdev_dir != IDETAPE_DIR_READ)
                 return 0;
 
         /* Remove merge stage. */
-        cnt = tape->merge_stage_size / tape->tape_block_size;
+        cnt = tape->merge_stage_size / tape->blk_size;
         if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
                 ++cnt;          /* Filemarks count as 1 sector */
         tape->merge_stage_size = 0;
@@ -2286,22 +2122,22 @@ static int __idetape_discard_read_pipeline (ide_drive_t *drive)
 
         /* Clear pipeline flags. */
         clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
-        tape->chrdev_direction = idetape_direction_none;
+        tape->chrdev_dir = IDETAPE_DIR_NONE;
 
         /* Remove pipeline stages. */
         if (tape->first_stage == NULL)
                 return 0;
 
-        spin_lock_irqsave(&tape->spinlock, flags);
+        spin_lock_irqsave(&tape->lock, flags);
         tape->next_stage = NULL;
         if (idetape_pipeline_active(tape))
-                idetape_wait_for_request(drive, tape->active_data_request);
-        spin_unlock_irqrestore(&tape->spinlock, flags);
+                idetape_wait_for_request(drive, tape->active_data_rq);
+        spin_unlock_irqrestore(&tape->lock, flags);
 
         while (tape->first_stage != NULL) {
                 struct request *rq_ptr = &tape->first_stage->rq;
 
-                cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; 
+                cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
                 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
                         ++cnt;
                 idetape_remove_stage_head(drive);
@@ -2312,21 +2148,19 @@ static int __idetape_discard_read_pipeline (ide_drive_t *drive)
 }
 
 /*
- *      idetape_position_tape positions the tape to the requested block
- *      using the LOCATE packet command. A READ POSITION command is then
- *      issued to check where we are positioned.
- *
- *      Like all higher level operations, we queue the commands at the tail
- *      of the request queue and wait for their completion.
- *      
+ * Position the tape to the requested block using the LOCATE packet command.
+ * A READ POSITION command is then issued to check where we are positioned. Like
+ * all higher level operations, we queue the commands at the tail of the request
+ * queue and wait for their completion.
  */
-static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
+static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
+                u8 partition, int skip)
 {
         idetape_tape_t *tape = drive->driver_data;
         int retval;
         idetape_pc_t pc;
 
-        if (tape->chrdev_direction == idetape_direction_read)
+        if (tape->chrdev_dir == IDETAPE_DIR_READ)
                 __idetape_discard_read_pipeline(drive);
         idetape_wait_ready(drive, 60 * 5 * HZ);
         idetape_create_locate_cmd(drive, &pc, block, partition, skip);
@@ -2338,7 +2172,8 @@ static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 par
         return (idetape_queue_pc_tail(drive, &pc));
 }
 
-static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
+static void idetape_discard_read_pipeline(ide_drive_t *drive,
+                                          int restore_position)
 {
         idetape_tape_t *tape = drive->driver_data;
         int cnt;
@@ -2349,35 +2184,37 @@ static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_posit
                 position = idetape_read_position(drive);
                 seek = position > cnt ? position - cnt : 0;
                 if (idetape_position_tape(drive, seek, 0, 0)) {
-                        printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
+                        printk(KERN_INFO "ide-tape: %s: position_tape failed in"
+                                         " discard_pipeline()\n", tape->name);
                         return;
                 }
         }
 }
 
 /*
- * idetape_queue_rw_tail generates a read/write request for the block
- * device interface and wait for it to be serviced.
+ * Generate a read/write request for the block device interface and wait for it
+ * to be serviced.
  */
-static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
+static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
+                                 struct idetape_bh *bh)
 {
         idetape_tape_t *tape = drive->driver_data;
         struct request rq;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 2)
-                printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
+
         if (idetape_pipeline_active(tape)) {
-                printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
+                printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
+                                __func__);
                 return (0);
         }
 
         idetape_init_rq(&rq, cmd);
         rq.rq_disk = tape->disk;
         rq.special = (void *)bh;
-        rq.sector = tape->first_frame_position;
-        rq.nr_sectors = rq.current_nr_sectors = blocks;
+        rq.sector = tape->first_frame;
+        rq.nr_sectors           = blocks;
+        rq.current_nr_sectors   = blocks;
         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 
         if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
@@ -2387,14 +2224,11 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct
                 idetape_init_merge_stage(tape);
         if (rq.errors == IDETAPE_ERROR_GENERAL)
                 return -EIO;
-        return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
+        return (tape->blk_size * (blocks-rq.current_nr_sectors));
 }
 
-/*
- *      idetape_insert_pipeline_into_queue is used to start servicing the
- *      pipeline stages, starting from tape->next_stage.
- */
-static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
+/* start servicing the pipeline stages, starting from tape->next_stage. */
+static void idetape_plug_pipeline(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
@@ -2403,19 +2237,20 @@ static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
         if (!idetape_pipeline_active(tape)) {
                 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
                 idetape_activate_next_stage(drive);
-                (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
+                (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end);
         }
 }
 
-static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
+static void idetape_create_inquiry_cmd(idetape_pc_t *pc)
 {
         idetape_init_pc(pc);
         pc->c[0] = INQUIRY;
-        pc->c[4] = pc->request_transfer = 254;
+        pc->c[4] = 254;
+        pc->request_transfer = 254;
         pc->callback = &idetape_pc_callback;
 }
 
-static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
+static void idetape_create_rewind_cmd(ide_drive_t *drive, idetape_pc_t *pc)
 {
         idetape_init_pc(pc);
         pc->c[0] = REZERO_UNIT;
@@ -2423,7 +2258,7 @@ static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
         pc->callback = &idetape_pc_callback;
 }
 
-static void idetape_create_erase_cmd (idetape_pc_t *pc)
+static void idetape_create_erase_cmd(idetape_pc_t *pc)
 {
         idetape_init_pc(pc);
         pc->c[0] = ERASE;
@@ -2432,7 +2267,7 @@ static void idetape_create_erase_cmd (idetape_pc_t *pc)
         pc->callback = &idetape_pc_callback;
 }
 
-static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
+static void idetape_create_space_cmd(idetape_pc_t *pc, int count, u8 cmd)
 {
         idetape_init_pc(pc);
         pc->c[0] = SPACE;
@@ -2442,89 +2277,87 @@ static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
         pc->callback = &idetape_pc_callback;
 }
 
-static void idetape_wait_first_stage (ide_drive_t *drive)
+static void idetape_wait_first_stage(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         unsigned long flags;
 
         if (tape->first_stage == NULL)
                 return;
-        spin_lock_irqsave(&tape->spinlock, flags);
+        spin_lock_irqsave(&tape->lock, flags);
         if (tape->active_stage == tape->first_stage)
-                idetape_wait_for_request(drive, tape->active_data_request);
-        spin_unlock_irqrestore(&tape->spinlock, flags);
+                idetape_wait_for_request(drive, tape->active_data_rq);
+        spin_unlock_irqrestore(&tape->lock, flags);
 }
 
 /*
- *      idetape_add_chrdev_write_request tries to add a character device
- *      originated write request to our pipeline. In case we don't succeed,
- *      we revert to non-pipelined operation mode for this request.
+ * Try to add a character device originated write request to our pipeline. In
+ * case we don't succeed, we revert to non-pipelined operation mode for this
+ * request. In order to accomplish that, we
  *
- *      1.      Try to allocate a new pipeline stage.
- *      2.      If we can't, wait for more and more requests to be serviced
- *              and try again each time.
- *      3.      If we still can't allocate a stage, fallback to
- *              non-pipelined operation mode for this request.
+ * 1. Try to allocate a new pipeline stage.
+ * 2. If we can't, wait for more and more requests to be serviced and try again
+ * each time.
+ * 3. If we still can't allocate a stage, fallback to non-pipelined operation
+ * mode for this request.
  */
-static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
+static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_stage_t *new_stage;
         unsigned long flags;
         struct request *rq;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 3)
-                printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
 
-        /*
-         *      Attempt to allocate a new stage.
-         *      Pay special attention to possible race conditions.
-         */
+        /* Attempt to allocate a new stage. Beware possible race conditions. */
         while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
-                spin_lock_irqsave(&tape->spinlock, flags);
+                spin_lock_irqsave(&tape->lock, flags);
                 if (idetape_pipeline_active(tape)) {
-                        idetape_wait_for_request(drive, tape->active_data_request);
-                        spin_unlock_irqrestore(&tape->spinlock, flags);
+                        idetape_wait_for_request(drive, tape->active_data_rq);
+                        spin_unlock_irqrestore(&tape->lock, flags);
                 } else {
-                        spin_unlock_irqrestore(&tape->spinlock, flags);
-                        idetape_insert_pipeline_into_queue(drive);
+                        spin_unlock_irqrestore(&tape->lock, flags);
+                        idetape_plug_pipeline(drive);
                         if (idetape_pipeline_active(tape))
                                 continue;
                         /*
-                         *      Linux is short on memory. Fallback to
-                         *      non-pipelined operation mode for this request.
+                         * The machine is short on memory. Fallback to non-
+                         * pipelined operation mode for this request.
                          */
-                        return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
+                        return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
+                                                blocks, tape->merge_stage->bh);
                 }
         }
         rq = &new_stage->rq;
         idetape_init_rq(rq, REQ_IDETAPE_WRITE);
         /* Doesn't actually matter - We always assume sequential access */
-        rq->sector = tape->first_frame_position;
-        rq->nr_sectors = rq->current_nr_sectors = blocks;
+        rq->sector = tape->first_frame;
+        rq->current_nr_sectors = blocks;
+        rq->nr_sectors = blocks;
 
         idetape_switch_buffers(tape, new_stage);
         idetape_add_stage_tail(drive, new_stage);
         tape->pipeline_head++;
-        calculate_speeds(drive);
+        idetape_calculate_speeds(drive);
 
         /*
-         *      Estimate whether the tape has stopped writing by checking
-         *      if our write pipeline is currently empty. If we are not
-         *      writing anymore, wait for the pipeline to be full enough
-         *      (90%) before starting to service requests, so that we will
-         *      be able to keep up with the higher speeds of the tape.
+         * Estimate whether the tape has stopped writing by checking if our
+         * write pipeline is currently empty. If we are not writing anymore,
+         * wait for the pipeline to be almost completely full (90%) before
+         * starting to service requests, so that we will be able to keep up with
+         * the higher speeds of the tape.
          */
         if (!idetape_pipeline_active(tape)) {
                 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
-                    tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
+                        tape->nr_stages >= tape->max_stages -
+                        tape->uncontrolled_pipeline_head_speed * 3 * 1024 /
+                        tape->blk_size) {
                         tape->measure_insert_time = 1;
                         tape->insert_time = jiffies;
                         tape->insert_size = 0;
                         tape->insert_speed = 0;
-                        idetape_insert_pipeline_into_queue(drive);
+                        idetape_plug_pipeline(drive);
                 }
         }
         if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
@@ -2534,31 +2367,32 @@ static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
 }
 
 /*
- *      idetape_wait_for_pipeline will wait until all pending pipeline
- *      requests are serviced. Typically called on device close.
+ * Wait until all pending pipeline requests are serviced. Typically called on
+ * device close.
  */
-static void idetape_wait_for_pipeline (ide_drive_t *drive)
+static void idetape_wait_for_pipeline(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         unsigned long flags;
 
         while (tape->next_stage || idetape_pipeline_active(tape)) {
-                idetape_insert_pipeline_into_queue(drive);
-                spin_lock_irqsave(&tape->spinlock, flags);
+                idetape_plug_pipeline(drive);
+                spin_lock_irqsave(&tape->lock, flags);
                 if (idetape_pipeline_active(tape))
-                        idetape_wait_for_request(drive, tape->active_data_request);
-                spin_unlock_irqrestore(&tape->spinlock, flags);
+                        idetape_wait_for_request(drive, tape->active_data_rq);
+                spin_unlock_irqrestore(&tape->lock, flags);
         }
 }
 
-static void idetape_empty_write_pipeline (ide_drive_t *drive)
+static void idetape_empty_write_pipeline(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         int blocks, min;
         struct idetape_bh *bh;
 
-        if (tape->chrdev_direction != idetape_direction_write) {
-                printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
+        if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
+                printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline,"
+                                " but we are not writing.\n");
                 return;
         }
         if (tape->merge_stage_size > tape->stage_size) {
@@ -2566,12 +2400,13 @@ static void idetape_empty_write_pipeline (ide_drive_t *drive)
                 tape->merge_stage_size = tape->stage_size;
         }
         if (tape->merge_stage_size) {
-                blocks = tape->merge_stage_size / tape->tape_block_size;
-                if (tape->merge_stage_size % tape->tape_block_size) {
+                blocks = tape->merge_stage_size / tape->blk_size;
+                if (tape->merge_stage_size % tape->blk_size) {
                         unsigned int i;
 
                         blocks++;
-                        i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
+                        i = tape->blk_size - tape->merge_stage_size %
+                                tape->blk_size;
                         bh = tape->bh->b_reqnext;
                         while (bh) {
                                 atomic_set(&bh->b_count, 0);
@@ -2580,12 +2415,14 @@ static void idetape_empty_write_pipeline (ide_drive_t *drive)
                         bh = tape->bh;
                         while (i) {
                                 if (bh == NULL) {
-
-                                        printk(KERN_INFO "ide-tape: bug, bh NULL\n");
+                                        printk(KERN_INFO "ide-tape: bug,"
+                                                         " bh NULL\n");
                                         break;
                                 }
-                                min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
-                                memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
+                                min = min(i, (unsigned int)(bh->b_size -
+                                                atomic_read(&bh->b_count)));
+                                memset(bh->b_data + atomic_read(&bh->b_count),
+                                                0, min);
                                 atomic_add(min, &bh->b_count);
                                 i -= min;
                                 bh = bh->b_reqnext;
@@ -2600,13 +2437,13 @@ static void idetape_empty_write_pipeline (ide_drive_t *drive)
                 tape->merge_stage = NULL;
         }
         clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
-        tape->chrdev_direction = idetape_direction_none;
+        tape->chrdev_dir = IDETAPE_DIR_NONE;
 
         /*
-         *      On the next backup, perform the feedback loop again.
-         *      (I don't want to keep sense information between backups,
-         *       as some systems are constantly on, and the system load
-         *       can be totally different on the next backup).
+         * On the next backup, perform the feedback loop again. (I don't want to
+         * keep sense information between backups, as some systems are
+         * constantly on, and the system load can be totally different on the
+         * next backup).
          */
         tape->max_stages = tape->min_pipeline;
         if (tape->first_stage != NULL ||
@@ -2621,21 +2458,25 @@ static void idetape_empty_write_pipeline (ide_drive_t *drive)
         }
 }
 
-static void idetape_restart_speed_control (ide_drive_t *drive)
+static void idetape_restart_speed_control(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
         tape->restart_speed_control_req = 0;
         tape->pipeline_head = 0;
-        tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
-        tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
-        tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
+        tape->controlled_last_pipeline_head = 0;
+        tape->controlled_previous_pipeline_head = 0;
+        tape->uncontrolled_previous_pipeline_head = 0;
+        tape->controlled_pipeline_head_speed = 5000;
+        tape->pipeline_head_speed = 5000;
         tape->uncontrolled_pipeline_head_speed = 0;
-        tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
-        tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
+        tape->controlled_pipeline_head_time =
+                tape->uncontrolled_pipeline_head_time = jiffies;
+        tape->controlled_previous_head_time =
+                tape->uncontrolled_previous_head_time = jiffies;
 }
 
-static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
+static int idetape_init_read(ide_drive_t *drive, int max_stages)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_stage_t *new_stage;
@@ -2644,32 +2485,35 @@ static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
         u16 blocks = *(u16 *)&tape->caps[12];
 
         /* Initialize read operation */
-        if (tape->chrdev_direction != idetape_direction_read) {
-                if (tape->chrdev_direction == idetape_direction_write) {
+        if (tape->chrdev_dir != IDETAPE_DIR_READ) {
+                if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
                         idetape_empty_write_pipeline(drive);
                         idetape_flush_tape_buffers(drive);
                 }
                 if (tape->merge_stage || tape->merge_stage_size) {
-                        printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
+                        printk(KERN_ERR "ide-tape: merge_stage_size should be"
+                                         " 0 now\n");
                         tape->merge_stage_size = 0;
                 }
-                if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
+                tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
+                if (!tape->merge_stage)
                         return -ENOMEM;
-                tape->chrdev_direction = idetape_direction_read;
+                tape->chrdev_dir = IDETAPE_DIR_READ;
 
                 /*
-                 *      Issue a read 0 command to ensure that DSC handshake
-                 *      is switched from completion mode to buffer available
-                 *      mode.
-                 *      No point in issuing this if DSC overlap isn't supported,
-                 *      some drives (Seagate STT3401A) will return an error.
+                 * Issue a read 0 command to ensure that DSC handshake is
+                 * switched from completion mode to buffer available mode.
+                 * No point in issuing this if DSC overlap isn't supported, some
+                 * drives (Seagate STT3401A) will return an error.
                  */
                 if (drive->dsc_overlap) {
-                        bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
+                        bytes_read = idetape_queue_rw_tail(drive,
+                                                        REQ_IDETAPE_READ, 0,
+                                                        tape->merge_stage->bh);
                         if (bytes_read < 0) {
                                 __idetape_kfree_stage(tape->merge_stage);
                                 tape->merge_stage = NULL;
-                                tape->chrdev_direction = idetape_direction_none;
+                                tape->chrdev_dir = IDETAPE_DIR_NONE;
                                 return bytes_read;
                         }
                 }
@@ -2677,8 +2521,9 @@ static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
         if (tape->restart_speed_control_req)
                 idetape_restart_speed_control(drive);
         idetape_init_rq(&rq, REQ_IDETAPE_READ);
-        rq.sector = tape->first_frame_position;
-        rq.nr_sectors = rq.current_nr_sectors = blocks;
+        rq.sector = tape->first_frame;
+        rq.nr_sectors = blocks;
+        rq.current_nr_sectors = blocks;
         if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
             tape->nr_stages < max_stages) {
                 new_stage = idetape_kmalloc_stage(tape);
@@ -2696,50 +2541,43 @@ static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
                         tape->insert_time = jiffies;
                         tape->insert_size = 0;
                         tape->insert_speed = 0;
-                        idetape_insert_pipeline_into_queue(drive);
+                        idetape_plug_pipeline(drive);
                 }
         }
         return 0;
 }
 
 /*
- *      idetape_add_chrdev_read_request is called from idetape_chrdev_read
- *      to service a character device read request and add read-ahead
- *      requests to our pipeline.
+ * Called from idetape_chrdev_read() to service a character device read request
+ * and add read-ahead requests to our pipeline.
  */
-static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
+static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
 {
         idetape_tape_t *tape = drive->driver_data;
         unsigned long flags;
         struct request *rq_ptr;
         int bytes_read;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
 
-        /*
-         * If we are at a filemark, return a read length of 0
-         */
+        /* If we are at a filemark, return a read length of 0 */
         if (test_bit(IDETAPE_FILEMARK, &tape->flags))
                 return 0;
 
-        /*
-         * Wait for the next block to be available at the head
-         * of the pipeline
-         */
-        idetape_initiate_read(drive, tape->max_stages);
+        /* Wait for the next block to reach the head of the pipeline. */
+        idetape_init_read(drive, tape->max_stages);
         if (tape->first_stage == NULL) {
                 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
                         return 0;
-                return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
+                return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
+                                        tape->merge_stage->bh);
         }
         idetape_wait_first_stage(drive);
         rq_ptr = &tape->first_stage->rq;
-        bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
-        rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
-
+        bytes_read = tape->blk_size * (rq_ptr->nr_sectors -
+                                        rq_ptr->current_nr_sectors);
+        rq_ptr->nr_sectors = 0;
+        rq_ptr->current_nr_sectors = 0;
 
         if (rq_ptr->errors == IDETAPE_ERROR_EOD)
                 return 0;
@@ -2747,43 +2585,46 @@ static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
                 idetape_switch_buffers(tape, tape->first_stage);
                 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
                         set_bit(IDETAPE_FILEMARK, &tape->flags);
-                spin_lock_irqsave(&tape->spinlock, flags);
+                spin_lock_irqsave(&tape->lock, flags);
                 idetape_remove_stage_head(drive);
-                spin_unlock_irqrestore(&tape->spinlock, flags);
+                spin_unlock_irqrestore(&tape->lock, flags);
                 tape->pipeline_head++;
-                calculate_speeds(drive);
+                idetape_calculate_speeds(drive);
         }
-        if (bytes_read > blocks * tape->tape_block_size) {
-                printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
-                bytes_read = blocks * tape->tape_block_size;
+        if (bytes_read > blocks * tape->blk_size) {
+                printk(KERN_ERR "ide-tape: bug: trying to return more bytes"
+                                " than requested\n");
+                bytes_read = blocks * tape->blk_size;
         }
         return (bytes_read);
 }
 
-static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
+static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
 {
         idetape_tape_t *tape = drive->driver_data;
         struct idetape_bh *bh;
         int blocks;
-        
+
         while (bcount) {
                 unsigned int count;
 
                 bh = tape->merge_stage->bh;
                 count = min(tape->stage_size, bcount);
                 bcount -= count;
-                blocks = count / tape->tape_block_size;
+                blocks = count / tape->blk_size;
                 while (count) {
-                        atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
+                        atomic_set(&bh->b_count,
+                                   min(count, (unsigned int)bh->b_size));
                         memset(bh->b_data, 0, atomic_read(&bh->b_count));
                         count -= atomic_read(&bh->b_count);
                         bh = bh->b_reqnext;
                 }
-                idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
+                idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
+                                      tape->merge_stage->bh);
         }
 }
 
-static int idetape_pipeline_size (ide_drive_t *drive)
+static int idetape_pipeline_size(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_stage_t *stage;
@@ -2794,9 +2635,10 @@ static int idetape_pipeline_size (ide_drive_t *drive)
         stage = tape->first_stage;
         while (stage != NULL) {
                 rq = &stage->rq;
-                size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
+                size += tape->blk_size * (rq->nr_sectors -
+                                rq->current_nr_sectors);
                 if (rq->errors == IDETAPE_ERROR_FILEMARK)
-                        size += tape->tape_block_size;
+                        size += tape->blk_size;
                 stage = stage->next;
         }
         size += tape->merge_stage_size;
@@ -2804,20 +2646,18 @@ static int idetape_pipeline_size (ide_drive_t *drive)
 }
 
 /*
- *      Rewinds the tape to the Beginning Of the current Partition (BOP).
- *
- *      We currently support only one partition.
- */ 
-static int idetape_rewind_tape (ide_drive_t *drive)
+ * Rewinds the tape to the Beginning Of the current Partition (BOP). We
+ * currently support only one partition.
+ */
+static int idetape_rewind_tape(ide_drive_t *drive)
 {
         int retval;
         idetape_pc_t pc;
-#if IDETAPE_DEBUG_LOG
-        idetape_tape_t *tape = drive->driver_data;
-        if (tape->debug_level >= 2)
-                printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
-#endif /* IDETAPE_DEBUG_LOG */  
-        
+        idetape_tape_t *tape;
+        tape = drive->driver_data;
+
+        debug_log(DBG_SENSE, "Enter %s\n", __func__);
+
         idetape_create_rewind_cmd(drive, &pc);
         retval = idetape_queue_pc_tail(drive, &pc);
         if (retval)
@@ -2830,14 +2670,9 @@ static int idetape_rewind_tape (ide_drive_t *drive)
         return 0;
 }
 
-/*
- *      Our special ide-tape ioctl's.
- *
- *      Currently there aren't any ioctl's.
- *      mtio.h compatible commands should be issued to the character device
- *      interface.
- */
-static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
+/* mtio.h compatible commands should be issued to the chrdev interface. */
+static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
+                                unsigned long arg)
 {
         idetape_tape_t *tape = drive->driver_data;
         void __user *argp = (void __user *)arg;
@@ -2848,44 +2683,41 @@ static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned l
                 int nr_stages;
         } config;
 
-#if IDETAPE_DEBUG_LOG   
-        if (tape->debug_level >= 4)
-                printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_PROCS, "Enter %s\n", __func__);
+
         switch (cmd) {
-                case 0x0340:
-                        if (copy_from_user(&config, argp, sizeof(config)))
-                                return -EFAULT;
-                        tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
-                        tape->max_stages = config.nr_stages;
-                        break;
-                case 0x0350:
-                        config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
-                        config.nr_stages = tape->max_stages; 
-                        if (copy_to_user(argp, &config, sizeof(config)))
-                                return -EFAULT;
-                        break;
-                default:
-                        return -EIO;
+        case 0x0340:
+                if (copy_from_user(&config, argp, sizeof(config)))
+                        return -EFAULT;
+                tape->best_dsc_rw_freq = config.dsc_rw_frequency;
+                tape->max_stages = config.nr_stages;
+                break;
+        case 0x0350:
+                config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
+                config.nr_stages = tape->max_stages;
+                if (copy_to_user(argp, &config, sizeof(config)))
+                        return -EFAULT;
+                break;
+        default:
+                return -EIO;
         }
         return 0;
 }
 
 /*
- *      idetape_space_over_filemarks is now a bit more complicated than just
- *      passing the command to the tape since we may have crossed some
- *      filemarks during our pipelined read-ahead mode.
- *
- *      As a minor side effect, the pipeline enables us to support MTFSFM when
- *      the filemark is in our internal pipeline even if the tape doesn't
- *      support spacing over filemarks in the reverse direction.
+ * The function below is now a bit more complicated than just passing the
+ * command to the tape since we may have crossed some filemarks during our
+ * pipelined read-ahead mode. As a minor side effect, the pipeline enables us to
+ * support MTFSFM when the filemark is in our internal pipeline even if the tape
+ * doesn't support spacing over filemarks in the reverse direction.
  */
-static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
+static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
+                                        int mt_count)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t pc;
         unsigned long flags;
-        int retval,count=0;
+        int retval, count = 0;
         int sprev = !!(tape->caps[4] & 0x20);
 
         if (mt_count == 0)
@@ -2893,14 +2725,11 @@ static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_c
         if (MTBSF == mt_op || MTBSFM == mt_op) {
                 if (!sprev)
                         return -EIO;
-                mt_count = - mt_count;
+                mt_count = -mt_count;
         }
 
-        if (tape->chrdev_direction == idetape_direction_read) {
-                /*
-                 *      We have a read-ahead buffer. Scan it for crossed
-                 *      filemarks.
-                 */
+        if (tape->chrdev_dir == IDETAPE_DIR_READ) {
+                /* its a read-ahead buffer, scan it for crossed filemarks. */
                 tape->merge_stage_size = 0;
                 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
                         ++count;
@@ -2910,24 +2739,27 @@ static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_c
                                         set_bit(IDETAPE_FILEMARK, &tape->flags);
                                 return 0;
                         }
-                        spin_lock_irqsave(&tape->spinlock, flags);
+                        spin_lock_irqsave(&tape->lock, flags);
                         if (tape->first_stage == tape->active_stage) {
                                 /*
-                                 *      We have reached the active stage in the read pipeline.
-                                 *      There is no point in allowing the drive to continue
-                                 *      reading any farther, so we stop the pipeline.
+                                 * We have reached the active stage in the read
+                                 * pipeline. There is no point in allowing the
+                                 * drive to continue reading any farther, so we
+                                 * stop the pipeline.
                                  *
-                                 *      This section should be moved to a separate subroutine,
-                                 *      because a similar function is performed in
-                                 *      __idetape_discard_read_pipeline(), for example.
+                                 * This section should be moved to a separate
+                                 * subroutine because similar operations are
+                                 * done in __idetape_discard_read_pipeline(),
+                                 * for example.
                                  */
                                 tape->next_stage = NULL;
-                                spin_unlock_irqrestore(&tape->spinlock, flags);
+                                spin_unlock_irqrestore(&tape->lock, flags);
                                 idetape_wait_first_stage(drive);
                                 tape->next_stage = tape->first_stage->next;
                         } else
-                                spin_unlock_irqrestore(&tape->spinlock, flags);
-                        if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
+                                spin_unlock_irqrestore(&tape->lock, flags);
+                        if (tape->first_stage->rq.errors ==
+                                        IDETAPE_ERROR_FILEMARK)
                                 ++count;
                         idetape_remove_stage_head(drive);
                 }
@@ -2935,73 +2767,74 @@ static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_c
         }
 
         /*
-         *      The filemark was not found in our internal pipeline.
-         *      Now we can issue the space command.
+         * The filemark was not found in our internal pipeline; now we can issue
+         * the space command.
          */
         switch (mt_op) {
-                case MTFSF:
-                case MTBSF:
-                        idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
-                        return (idetape_queue_pc_tail(drive, &pc));
-                case MTFSFM:
-                case MTBSFM:
-                        if (!sprev)
-                                return (-EIO);
-                        retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
-                        if (retval) return (retval);
-                        count = (MTBSFM == mt_op ? 1 : -1);
-                        return (idetape_space_over_filemarks(drive, MTFSF, count));
-                default:
-                        printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
-                        return (-EIO);
+        case MTFSF:
+        case MTBSF:
+                idetape_create_space_cmd(&pc, mt_count - count,
+                                         IDETAPE_SPACE_OVER_FILEMARK);
+                return idetape_queue_pc_tail(drive, &pc);
+        case MTFSFM:
+        case MTBSFM:
+                if (!sprev)
+                        return -EIO;
+                retval = idetape_space_over_filemarks(drive, MTFSF,
+                                                      mt_count - count);
+                if (retval)
+                        return retval;
+                count = (MTBSFM == mt_op ? 1 : -1);
+                return idetape_space_over_filemarks(drive, MTFSF, count);
+        default:
+                printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
+                                mt_op);
+                return -EIO;
         }
 }
 
-
 /*
- *      Our character device read / write functions.
+ * Our character device read / write functions.
  *
- *      The tape is optimized to maximize throughput when it is transferring
- *      an integral number of the "continuous transfer limit", which is
- *      a parameter of the specific tape (26 KB on my particular tape).
- *      (32 kB for Onstream)
+ * The tape is optimized to maximize throughput when it is transferring an
+ * integral number of the "continuous transfer limit", which is a parameter of
+ * the specific tape (26kB on my particular tape, 32kB for Onstream).
  *
- *      As of version 1.3 of the driver, the character device provides an
- *      abstract continuous view of the media - any mix of block sizes (even 1
- *      byte) on the same backup/restore procedure is supported. The driver
- *      will internally convert the requests to the recommended transfer unit,
- *      so that an unmatch between the user's block size to the recommended
- *      size will only result in a (slightly) increased driver overhead, but
- *      will no longer hit performance.
- *      This is not applicable to Onstream.
+ * As of version 1.3 of the driver, the character device provides an abstract
+ * continuous view of the media - any mix of block sizes (even 1 byte) on the
+ * same backup/restore procedure is supported. The driver will internally
+ * convert the requests to the recommended transfer unit, so that an unmatch
+ * between the user's block size to the recommended size will only result in a
+ * (slightly) increased driver overhead, but will no longer hit performance.
+ * This is not applicable to Onstream.
  */
-static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
-                                    size_t count, loff_t *ppos)
+static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
+                                   size_t count, loff_t *ppos)
 {
         struct ide_tape_obj *tape = ide_tape_f(file);
         ide_drive_t *drive = tape->drive;
-        ssize_t bytes_read,temp, actually_read = 0, rc;
+        ssize_t bytes_read, temp, actually_read = 0, rc;
         ssize_t ret = 0;
         u16 ctl = *(u16 *)&tape->caps[12];
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 3)
-                printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
 
-        if (tape->chrdev_direction != idetape_direction_read) {
+        if (tape->chrdev_dir != IDETAPE_DIR_READ) {
                 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
-                        if (count > tape->tape_block_size &&
-                            (count % tape->tape_block_size) == 0)
-                                tape->user_bs_factor = count / tape->tape_block_size;
+                        if (count > tape->blk_size &&
+                            (count % tape->blk_size) == 0)
+                                tape->user_bs_factor = count / tape->blk_size;
         }
-        if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
+        rc = idetape_init_read(drive, tape->max_stages);
+        if (rc < 0)
                 return rc;
         if (count == 0)
                 return (0);
         if (tape->merge_stage_size) {
-                actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
-                if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
+                actually_read = min((unsigned int)(tape->merge_stage_size),
+                                    (unsigned int)count);
+                if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
+                                               actually_read))
                         ret = -EFAULT;
                 buf += actually_read;
                 tape->merge_stage_size -= actually_read;
@@ -3011,7 +2844,8 @@ static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
                 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
                 if (bytes_read <= 0)
                         goto finish;
-                if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
+                if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
+                                               bytes_read))
                         ret = -EFAULT;
                 buf += bytes_read;
                 count -= bytes_read;
@@ -3022,25 +2856,24 @@ static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
                 if (bytes_read <= 0)
                         goto finish;
                 temp = min((unsigned long)count, (unsigned long)bytes_read);
-                if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
+                if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
+                                               temp))
                         ret = -EFAULT;
                 actually_read += temp;
                 tape->merge_stage_size = bytes_read-temp;
         }
 finish:
         if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
-#if IDETAPE_DEBUG_LOG
-                if (tape->debug_level >= 2)
-                        printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
-#endif
+                debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
+
                 idetape_space_over_filemarks(drive, MTFSF, 1);
                 return 0;
         }
 
-        return (ret) ? ret : actually_read;
+        return ret ? ret : actually_read;
 }
 
-static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
+static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
                                      size_t count, loff_t *ppos)
 {
         struct ide_tape_obj *tape = ide_tape_f(file);
@@ -3053,39 +2886,37 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
         if (tape->write_prot)
                 return -EACCES;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 3)
-                printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
-                        "count %Zd\n", count);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
 
         /* Initialize write operation */
-        if (tape->chrdev_direction != idetape_direction_write) {
-                if (tape->chrdev_direction == idetape_direction_read)
+        if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
+                if (tape->chrdev_dir == IDETAPE_DIR_READ)
                         idetape_discard_read_pipeline(drive, 1);
                 if (tape->merge_stage || tape->merge_stage_size) {
                         printk(KERN_ERR "ide-tape: merge_stage_size "
                                 "should be 0 now\n");
                         tape->merge_stage_size = 0;
                 }
-                if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
+                tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
+                if (!tape->merge_stage)
                         return -ENOMEM;
-                tape->chrdev_direction = idetape_direction_write;
+                tape->chrdev_dir = IDETAPE_DIR_WRITE;
                 idetape_init_merge_stage(tape);
 
                 /*
-                 *      Issue a write 0 command to ensure that DSC handshake
-                 *      is switched from completion mode to buffer available
-                 *      mode.
-                 *      No point in issuing this if DSC overlap isn't supported,
-                 *      some drives (Seagate STT3401A) will return an error.
+                 * Issue a write 0 command to ensure that DSC handshake is
+                 * switched from completion mode to buffer available mode. No
+                 * point in issuing this if DSC overlap isn't supported, some
+                 * drives (Seagate STT3401A) will return an error.
                  */
                 if (drive->dsc_overlap) {
-                        ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
+                        ssize_t retval = idetape_queue_rw_tail(drive,
+                                                        REQ_IDETAPE_WRITE, 0,
+                                                        tape->merge_stage->bh);
                         if (retval < 0) {
                                 __idetape_kfree_stage(tape->merge_stage);
                                 tape->merge_stage = NULL;
-                                tape->chrdev_direction = idetape_direction_none;
+                                tape->chrdev_dir = IDETAPE_DIR_NONE;
                                 return retval;
                         }
                 }
@@ -3096,11 +2927,14 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
                 idetape_restart_speed_control(drive);
         if (tape->merge_stage_size) {
                 if (tape->merge_stage_size >= tape->stage_size) {
-                        printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
+                        printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
                         tape->merge_stage_size = 0;
                 }
-                actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
-                if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
+                actually_written = min((unsigned int)
+                                (tape->stage_size - tape->merge_stage_size),
+                                (unsigned int)count);
+                if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
+                                                 actually_written))
                                 ret = -EFAULT;
                 buf += actually_written;
                 tape->merge_stage_size += actually_written;
@@ -3116,7 +2950,8 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
         }
         while (count >= tape->stage_size) {
                 ssize_t retval;
-                if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
+                if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
+                                                 tape->stage_size))
                         ret = -EFAULT;
                 buf += tape->stage_size;
                 count -= tape->stage_size;
@@ -3127,14 +2962,15 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
         }
         if (count) {
                 actually_written += count;
-                if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
+                if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
+                                                 count))
                         ret = -EFAULT;
                 tape->merge_stage_size += count;
         }
-        return (ret) ? ret : actually_written;
+        return ret ? ret : actually_written;
 }
 
-static int idetape_write_filemark (ide_drive_t *drive)
+static int idetape_write_filemark(ide_drive_t *drive)
 {
         idetape_pc_t pc;
 
@@ -3165,113 +3001,117 @@ static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t pc;
-        int i,retval;
+        int i, retval;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 1)
-                printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
-                        "mt_op=%d, mt_count=%d\n", mt_op, mt_count);
-#endif /* IDETAPE_DEBUG_LOG */
-        /*
-         *      Commands which need our pipelined read-ahead stages.
-         */
+        debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
+                        mt_op, mt_count);
+
+        /* Commands which need our pipelined read-ahead stages. */
         switch (mt_op) {
-                case MTFSF:
-                case MTFSFM:
-                case MTBSF:
-                case MTBSFM:
-                        if (!mt_count)
-                                return (0);
-                        return (idetape_space_over_filemarks(drive,mt_op,mt_count));
-                default:
-                        break;
+        case MTFSF:
+        case MTFSFM:
+        case MTBSF:
+        case MTBSFM:
+                if (!mt_count)
+                        return 0;
+                return idetape_space_over_filemarks(drive, mt_op, mt_count);
+        default:
+                break;
         }
+
         switch (mt_op) {
-                case MTWEOF:
-                        if (tape->write_prot)
-                                return -EACCES;
-                        idetape_discard_read_pipeline(drive, 1);
-                        for (i = 0; i < mt_count; i++) {
-                                retval = idetape_write_filemark(drive);
-                                if (retval)
-                                        return retval;
-                        }
-                        return (0);
-                case MTREW:
-                        idetape_discard_read_pipeline(drive, 0);
-                        if (idetape_rewind_tape(drive))
+        case MTWEOF:
+                if (tape->write_prot)
+                        return -EACCES;
+                idetape_discard_read_pipeline(drive, 1);
+                for (i = 0; i < mt_count; i++) {
+                        retval = idetape_write_filemark(drive);
+                        if (retval)
+                                return retval;
+                }
+                return 0;
+        case MTREW:
+                idetape_discard_read_pipeline(drive, 0);
+                if (idetape_rewind_tape(drive))
+                        return -EIO;
+                return 0;
+        case MTLOAD:
+                idetape_discard_read_pipeline(drive, 0);
+                idetape_create_load_unload_cmd(drive, &pc,
+                                               IDETAPE_LU_LOAD_MASK);
+                return idetape_queue_pc_tail(drive, &pc);
+        case MTUNLOAD:
+        case MTOFFL:
+                /*
+                 * If door is locked, attempt to unlock before
+                 * attempting to eject.
+                 */
+                if (tape->door_locked) {
+                        if (idetape_create_prevent_cmd(drive, &pc, 0))
+                                if (!idetape_queue_pc_tail(drive, &pc))
+                                        tape->door_locked = DOOR_UNLOCKED;
+                }
+                idetape_discard_read_pipeline(drive, 0);
+                idetape_create_load_unload_cmd(drive, &pc,
+                                              !IDETAPE_LU_LOAD_MASK);
+                retval = idetape_queue_pc_tail(drive, &pc);
+                if (!retval)
+                        clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
+                return retval;
+        case MTNOP:
+                idetape_discard_read_pipeline(drive, 0);
+                return idetape_flush_tape_buffers(drive);
+        case MTRETEN:
+                idetape_discard_read_pipeline(drive, 0);
+                idetape_create_load_unload_cmd(drive, &pc,
+                        IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
+                return idetape_queue_pc_tail(drive, &pc);
+        case MTEOM:
+                idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
+                return idetape_queue_pc_tail(drive, &pc);
+        case MTERASE:
+                (void)idetape_rewind_tape(drive);
+                idetape_create_erase_cmd(&pc);
+                return idetape_queue_pc_tail(drive, &pc);
+        case MTSETBLK:
+                if (mt_count) {
+                        if (mt_count < tape->blk_size ||
+                            mt_count % tape->blk_size)
                                 return -EIO;
+                        tape->user_bs_factor = mt_count / tape->blk_size;
+                        clear_bit(IDETAPE_DETECT_BS, &tape->flags);
+                } else
+                        set_bit(IDETAPE_DETECT_BS, &tape->flags);
+                return 0;
+        case MTSEEK:
+                idetape_discard_read_pipeline(drive, 0);
+                return idetape_position_tape(drive,
+                        mt_count * tape->user_bs_factor, tape->partition, 0);
+        case MTSETPART:
+                idetape_discard_read_pipeline(drive, 0);
+                return idetape_position_tape(drive, 0, mt_count, 0);
+        case MTFSR:
+        case MTBSR:
+        case MTLOCK:
+                if (!idetape_create_prevent_cmd(drive, &pc, 1))
                         return 0;
-                case MTLOAD:
-                        idetape_discard_read_pipeline(drive, 0);
-                        idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
-                        return (idetape_queue_pc_tail(drive, &pc));
-                case MTUNLOAD:
-                case MTOFFL:
-                        /*
-                         * If door is locked, attempt to unlock before
-                         * attempting to eject.
-                         */
-                        if (tape->door_locked) {
-                                if (idetape_create_prevent_cmd(drive, &pc, 0))
-                                        if (!idetape_queue_pc_tail(drive, &pc))
-                                                tape->door_locked = DOOR_UNLOCKED;
-                        }
-                        idetape_discard_read_pipeline(drive, 0);
-                        idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
-                        retval = idetape_queue_pc_tail(drive, &pc);
-                        if (!retval)
-                                clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
+                retval = idetape_queue_pc_tail(drive, &pc);
+                if (retval)
                         return retval;
-                case MTNOP:
-                        idetape_discard_read_pipeline(drive, 0);
-                        return (idetape_flush_tape_buffers(drive));
-                case MTRETEN:
-                        idetape_discard_read_pipeline(drive, 0);
-                        idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
-                        return (idetape_queue_pc_tail(drive, &pc));
-                case MTEOM:
-                        idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
-                        return (idetape_queue_pc_tail(drive, &pc));
-                case MTERASE:
-                        (void) idetape_rewind_tape(drive);
-                        idetape_create_erase_cmd(&pc);
-                        return (idetape_queue_pc_tail(drive, &pc));
-                case MTSETBLK:
-                        if (mt_count) {
-                                if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
-                                        return -EIO;
-                                tape->user_bs_factor = mt_count / tape->tape_block_size;
-                                clear_bit(IDETAPE_DETECT_BS, &tape->flags);
-                        } else
-                                set_bit(IDETAPE_DETECT_BS, &tape->flags);
-                        return 0;
-                case MTSEEK:
-                        idetape_discard_read_pipeline(drive, 0);
-                        return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
-                case MTSETPART:
-                        idetape_discard_read_pipeline(drive, 0);
-                        return (idetape_position_tape(drive, 0, mt_count, 0));
-                case MTFSR:
-                case MTBSR:
-                case MTLOCK:
-                        if (!idetape_create_prevent_cmd(drive, &pc, 1))
-                                return 0;
-                        retval = idetape_queue_pc_tail(drive, &pc);
-                        if (retval) return retval;
-                        tape->door_locked = DOOR_EXPLICITLY_LOCKED;
-                        return 0;
-                case MTUNLOCK:
-                        if (!idetape_create_prevent_cmd(drive, &pc, 0))
-                                return 0;
-                        retval = idetape_queue_pc_tail(drive, &pc);
-                        if (retval) return retval;
-                        tape->door_locked = DOOR_UNLOCKED;
+                tape->door_locked = DOOR_EXPLICITLY_LOCKED;
+                return 0;
+        case MTUNLOCK:
+                if (!idetape_create_prevent_cmd(drive, &pc, 0))
                         return 0;
-                default:
-                        printk(KERN_ERR "ide-tape: MTIO operation %d not "
-                                "supported\n", mt_op);
-                        return (-EIO);
+                retval = idetape_queue_pc_tail(drive, &pc);
+                if (retval)
+                        return retval;
+                tape->door_locked = DOOR_UNLOCKED;
+                return 0;
+        default:
+                printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
+                                mt_op);
+                return -EIO;
         }
 }
 
@@ -3288,50 +3128,51 @@ static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
         struct mtop mtop;
         struct mtget mtget;
         struct mtpos mtpos;
-        int block_offset = 0, position = tape->first_frame_position;
+        int block_offset = 0, position = tape->first_frame;
         void __user *argp = (void __user *)arg;
 
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 3)
-                printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
-                        "cmd=%u\n", cmd);
-#endif /* IDETAPE_DEBUG_LOG */
+        debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
 
         tape->restart_speed_control_req = 1;
-        if (tape->chrdev_direction == idetape_direction_write) {
+        if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
                 idetape_empty_write_pipeline(drive);
                 idetape_flush_tape_buffers(drive);
         }
         if (cmd == MTIOCGET || cmd == MTIOCPOS) {
-                block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
-                if ((position = idetape_read_position(drive)) < 0)
+                block_offset = idetape_pipeline_size(drive) /
+                        (tape->blk_size * tape->user_bs_factor);
+                position = idetape_read_position(drive);
+                if (position < 0)
                         return -EIO;
         }
         switch (cmd) {
-                case MTIOCTOP:
-                        if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
-                                return -EFAULT;
-                        return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
-                case MTIOCGET:
-                        memset(&mtget, 0, sizeof (struct mtget));
-                        mtget.mt_type = MT_ISSCSI2;
-                        mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
-                        mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
-                        if (tape->drv_write_prot) {
-                                mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
-                        }
-                        if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
-                                return -EFAULT;
-                        return 0;
-                case MTIOCPOS:
-                        mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
-                        if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
-                                return -EFAULT;
-                        return 0;
-                default:
-                        if (tape->chrdev_direction == idetape_direction_read)
-                                idetape_discard_read_pipeline(drive, 1);
-                        return idetape_blkdev_ioctl(drive, cmd, arg);
+        case MTIOCTOP:
+                if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
+                        return -EFAULT;
+                return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
+        case MTIOCGET:
+                memset(&mtget, 0, sizeof(struct mtget));
+                mtget.mt_type = MT_ISSCSI2;
+                mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
+                mtget.mt_dsreg =
+                        ((tape->blk_size * tape->user_bs_factor)
+                         << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
+
+                if (tape->drv_write_prot)
+                        mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
+
+                if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
+                        return -EFAULT;
+                return 0;
+        case MTIOCPOS:
+                mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
+                if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
+                        return -EFAULT;
+                return 0;
+        default:
+                if (tape->chrdev_dir == IDETAPE_DIR_READ)
+                        idetape_discard_read_pipeline(drive, 1);
+                return idetape_blkdev_ioctl(drive, cmd, arg);
         }
 }
 
@@ -3347,23 +3188,20 @@ static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
         idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
         if (idetape_queue_pc_tail(drive, &pc)) {
                 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
-                if (tape->tape_block_size == 0) {
+                if (tape->blk_size == 0) {
                         printk(KERN_WARNING "ide-tape: Cannot deal with zero "
                                             "block size, assuming 32k\n");
-                        tape->tape_block_size = 32768;
+                        tape->blk_size = 32768;
                 }
                 return;
         }
-        tape->tape_block_size = (pc.buffer[4 + 5] << 16) +
+        tape->blk_size = (pc.buffer[4 + 5] << 16) +
                                 (pc.buffer[4 + 6] << 8)  +
                                  pc.buffer[4 + 7];
         tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7;
 }
 
-/*
- *      Our character device open function.
- */
-static int idetape_chrdev_open (struct inode *inode, struct file *filp)
+static int idetape_chrdev_open(struct inode *inode, struct file *filp)
 {
         unsigned int minor = iminor(inode), i = minor & ~0xc0;
         ide_drive_t *drive;
@@ -3371,6 +3209,15 @@ static int idetape_chrdev_open (struct inode *inode, struct file *filp)
         idetape_pc_t pc;
         int retval;
 
+        if (i >= MAX_HWIFS * MAX_DRIVES)
+                return -ENXIO;
+
+        tape = ide_tape_chrdev_get(i);
+        if (!tape)
+                return -ENXIO;
+
+        debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
+
         /*
          * We really want to do nonseekable_open(inode, filp); here, but some
          * versions of tar incorrectly call lseek on tapes and bail out if that
@@ -3378,16 +3225,6 @@ static int idetape_chrdev_open (struct inode *inode, struct file *filp)
          */
         filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
 
-#if IDETAPE_DEBUG_LOG
-        printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
-#endif /* IDETAPE_DEBUG_LOG */
-        
-        if (i >= MAX_HWIFS * MAX_DRIVES)
-                return -ENXIO;
-
-        if (!(tape = ide_tape_chrdev_get(i)))
-                return -ENXIO;
-
         drive = tape->drive;
 
         filp->private_data = tape;
@@ -3408,7 +3245,7 @@ static int idetape_chrdev_open (struct inode *inode, struct file *filp)
         if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
                 (void)idetape_rewind_tape(drive);
 
-        if (tape->chrdev_direction != idetape_direction_read)
+        if (tape->chrdev_dir != IDETAPE_DIR_READ)
                 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
 
         /* Read block size and write protect status from drive. */
@@ -3430,10 +3267,8 @@ static int idetape_chrdev_open (struct inode *inode, struct file *filp)
                 }
         }
 
-        /*
-         * Lock the tape drive door so user can't eject.
-         */
-        if (tape->chrdev_direction == idetape_direction_none) {
+        /* Lock the tape drive door so user can't eject. */
+        if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
                 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
                         if (!idetape_queue_pc_tail(drive, &pc)) {
                                 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
@@ -3450,14 +3285,15 @@ out_put_tape:
         return retval;
 }
 
-static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
+static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
 {
         idetape_tape_t *tape = drive->driver_data;
 
         idetape_empty_write_pipeline(drive);
         tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
         if (tape->merge_stage != NULL) {
-                idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
+                idetape_pad_zeros(drive, tape->blk_size *
+                                (tape->user_bs_factor - 1));
                 __idetape_kfree_stage(tape->merge_stage);
                 tape->merge_stage = NULL;
         }
@@ -3466,10 +3302,7 @@ static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
         idetape_flush_tape_buffers(drive);
 }
 
-/*
- *      Our character device release function.
- */
-static int idetape_chrdev_release (struct inode *inode, struct file *filp)
+static int idetape_chrdev_release(struct inode *inode, struct file *filp)
 {
         struct ide_tape_obj *tape = ide_tape_f(filp);
         ide_drive_t *drive = tape->drive;
@@ -3478,14 +3311,12 @@ static int idetape_chrdev_release (struct inode *inode, struct file *filp)
 
         lock_kernel();
         tape = drive->driver_data;
-#if IDETAPE_DEBUG_LOG
-        if (tape->debug_level >= 3)
-                printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
-#endif /* IDETAPE_DEBUG_LOG */
 
-        if (tape->chrdev_direction == idetape_direction_write)
+        debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
+
+        if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
                 idetape_write_release(drive, minor);
-        if (tape->chrdev_direction == idetape_direction_read) {
+        if (tape->chrdev_dir == IDETAPE_DIR_READ) {
                 if (minor < 128)
                         idetape_discard_read_pipeline(drive, 1);
                 else
@@ -3497,7 +3328,7 @@ static int idetape_chrdev_release (struct inode *inode, struct file *filp)
         }
         if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
                 (void) idetape_rewind_tape(drive);
-        if (tape->chrdev_direction == idetape_direction_none) {
+        if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
                 if (tape->door_locked == DOOR_LOCKED) {
                         if (idetape_create_prevent_cmd(drive, &pc, 0)) {
                                 if (!idetape_queue_pc_tail(drive, &pc))
@@ -3512,37 +3343,39 @@ static int idetape_chrdev_release (struct inode *inode, struct file *filp)
 }
 
 /*
- *      idetape_identify_device is called to check the contents of the
- *      ATAPI IDENTIFY command results. We return:
+ * check the contents of the ATAPI IDENTIFY command results. We return:
  *
- *      1       If the tape can be supported by us, based on the information
- *              we have so far.
+ * 1 - If the tape can be supported by us, based on the information we have so
+ * far.
  *
- *      0       If this tape driver is not currently supported by us.
+ * 0 - If this tape driver is not currently supported by us.
  */
-static int idetape_identify_device (ide_drive_t *drive)
+static int idetape_identify_device(ide_drive_t *drive)
 {
-        struct idetape_id_gcw gcw;
-        struct hd_driveid *id = drive->id;
+        u8 gcw[2], protocol, device_type, removable, packet_size;
 
         if (drive->id_read == 0)
                 return 1;
 
-        *((unsigned short *) &gcw) = id->config;
+        *((unsigned short *) &gcw) = drive->id->config;
+
+        protocol        =   (gcw[1] & 0xC0) >> 6;
+        device_type     =    gcw[1] & 0x1F;
+        removable       = !!(gcw[0] & 0x80);
+        packet_size     =    gcw[0] & 0x3;
 
         /* Check that we can support this device */
-
-        if (gcw.protocol != 2)
+        if (protocol != 2)
                 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
-                                gcw.protocol);
-        else if (gcw.device_type != 1)
+                                protocol);
+        else if (device_type != 1)
                 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
-                                "to tape\n", gcw.device_type);
-        else if (!gcw.removable)
+                                "to tape\n", device_type);
+        else if (!removable)
                 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
-        else if (gcw.packet_size != 0) {
-                printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 "
-                                "bytes long\n", gcw.packet_size);
+        else if (packet_size != 0) {
+                printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12"
+                                " bytes\n", packet_size);
         } else
                 return 1;
         return 0;
@@ -3550,9 +3383,9 @@ static int idetape_identify_device (ide_drive_t *drive)
 
 static void idetape_get_inquiry_results(ide_drive_t *drive)
 {
-        char *r;
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t pc;
+        char fw_rev[6], vendor_id[10], product_id[18];
 
         idetape_create_inquiry_cmd(&pc);
         if (idetape_queue_pc_tail(drive, &pc)) {
@@ -3560,27 +3393,23 @@ static void idetape_get_inquiry_results(ide_drive_t *drive)
                                 tape->name);
                 return;
         }
-        memcpy(tape->vendor_id, &pc.buffer[8], 8);
-        memcpy(tape->product_id, &pc.buffer[16], 16);
-        memcpy(tape->firmware_revision, &pc.buffer[32], 4);
-
-        ide_fixstring(tape->vendor_id, 10, 0);
-        ide_fixstring(tape->product_id, 18, 0);
-        ide_fixstring(tape->firmware_revision, 6, 0);
-        r = tape->firmware_revision;
-        if (*(r + 1) == '.')
-                tape->firmware_revision_num = (*r - '0') * 100 +
-                        (*(r + 2) - '0') * 10 + *(r + 3) - '0';
+        memcpy(vendor_id, &pc.buffer[8], 8);
+        memcpy(product_id, &pc.buffer[16], 16);
+        memcpy(fw_rev, &pc.buffer[32], 4);
+
+        ide_fixstring(vendor_id, 10, 0);
+        ide_fixstring(product_id, 18, 0);
+        ide_fixstring(fw_rev, 6, 0);
+
         printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
-                        drive->name, tape->name, tape->vendor_id,
-                        tape->product_id, tape->firmware_revision);
+                        drive->name, tape->name, vendor_id, product_id, fw_rev);
 }
 
 /*
  * Ask the tape about its various parameters. In particular, we will adjust our
  * data transfer buffer size to the recommended value as returned by the tape.
  */
-static void idetape_get_mode_sense_results (ide_drive_t *drive)
+static void idetape_get_mode_sense_results(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
         idetape_pc_t pc;
@@ -3591,7 +3420,7 @@ static void idetape_get_mode_sense_results (ide_drive_t *drive)
         if (idetape_queue_pc_tail(drive, &pc)) {
                 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
                                 " some default values\n");
-                tape->tape_block_size = 512;
+                tape->blk_size = 512;
                 put_unaligned(52,   (u16 *)&tape->caps[12]);
                 put_unaligned(540,  (u16 *)&tape->caps[14]);
                 put_unaligned(6*52, (u16 *)&tape->caps[16]);
@@ -3621,62 +3450,75 @@ static void idetape_get_mode_sense_results (ide_drive_t *drive)
 
         memcpy(&tape->caps, caps, 20);
         if (caps[7] & 0x02)
-                tape->tape_block_size = 512;
+                tape->blk_size = 512;
         else if (caps[7] & 0x04)
-                tape->tape_block_size = 1024;
+                tape->blk_size = 1024;
 }
 
 #ifdef CONFIG_IDE_PROC_FS
-static void idetape_add_settings (ide_drive_t *drive)
+static void idetape_add_settings(ide_drive_t *drive)
 {
         idetape_tape_t *tape = drive->driver_data;
 
-/*
- *                      drive   setting name            read/write      data type       min                     max                     mul_factor                      div_factor      data pointer                            set function
- */
         ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
                         1, 2, (u16 *)&tape->caps[16], NULL);
-        ide_add_setting(drive,  "pipeline_min",         SETTING_RW,     TYPE_INT,       1,                      0xffff,                 tape->stage_size / 1024,        1,              &tape->min_pipeline,                    NULL);
-        ide_add_setting(drive,  "pipeline",             SETTING_RW,     TYPE_INT,       1,                      0xffff,                 tape->stage_size / 1024,        1,              &tape->max_stages,                      NULL);
-        ide_add_setting(drive,  "pipeline_max",         SETTING_RW,     TYPE_INT,       1,                      0xffff,                 tape->stage_size / 1024,        1,              &tape->max_pipeline,                    NULL);
-        ide_add_setting(drive,  "pipeline_used",        SETTING_READ,   TYPE_INT,       0,                      0xffff,                 tape->stage_size / 1024,        1,              &tape->nr_stages,                       NULL);
-        ide_add_setting(drive,  "pipeline_pending",     SETTING_READ,   TYPE_INT,       0,                      0xffff,                 tape->stage_size / 1024,        1,              &tape->nr_pending_stages,               NULL);
+        ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff,
+                        tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
+        ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff,
+                        tape->stage_size / 1024, 1, &tape->max_stages, NULL);
+        ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff,
+                        tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
+        ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0,
+                        0xffff, tape->stage_size / 1024, 1, &tape->nr_stages,
+                        NULL);
+        ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0,
+                        0xffff, tape->stage_size / 1024, 1,
+                        &tape->nr_pending_stages, NULL);
         ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
                         1, 1, (u16 *)&tape->caps[14], NULL);
-        ide_add_setting(drive,  "stage",                SETTING_READ,   TYPE_INT,       0,                      0xffff,                 1,                              1024,           &tape->stage_size,                      NULL);
-        ide_add_setting(drive,  "tdsc",                 SETTING_RW,     TYPE_INT,       IDETAPE_DSC_RW_MIN,     IDETAPE_DSC_RW_MAX,     1000,                           HZ,             &tape->best_dsc_rw_frequency,           NULL);
-        ide_add_setting(drive,  "dsc_overlap",          SETTING_RW,     TYPE_BYTE,      0,                      1,                      1,                              1,              &drive->dsc_overlap,                    NULL);
-        ide_add_setting(drive,  "pipeline_head_speed_c",SETTING_READ,   TYPE_INT,       0,                      0xffff,                 1,                              1,              &tape->controlled_pipeline_head_speed,  NULL);
-        ide_add_setting(drive,  "pipeline_head_speed_u",SETTING_READ,   TYPE_INT,       0,                      0xffff,                 1,                              1,              &tape->uncontrolled_pipeline_head_speed,NULL);
-        ide_add_setting(drive,  "avg_speed",            SETTING_READ,   TYPE_INT,       0,                      0xffff,                 1,                              1,              &tape->avg_speed,                       NULL);
-        ide_add_setting(drive,  "debug_level",          SETTING_RW,     TYPE_INT,       0,                      0xffff,                 1,                              1,              &tape->debug_level,                     NULL);
+        ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
+                        1024, &tape->stage_size, NULL);
+        ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
+                        IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
+                        NULL);
+        ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
+                        1, &drive->dsc_overlap, NULL);
+        ide_add_setting(drive, "pipeline_head_speed_c", SETTING_READ, TYPE_INT,
+                        0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed,
+                        NULL);
+        ide_add_setting(drive, "pipeline_head_speed_u", SETTING_READ, TYPE_INT,
+                        0, 0xffff, 1, 1,
+                        &tape->uncontrolled_pipeline_head_speed, NULL);
+        ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
+                        1, 1, &tape->avg_speed, NULL);
+        ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
+                        1, &tape->debug_mask, NULL);
 }
 #else
 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
 #endif
 
 /*
- *      ide_setup is called to:
+ * The function below is called to:
  *
- *              1.      Initialize our various state variables.
- *              2.      Ask the tape for its capabilities.
- *              3.      Allocate a buffer which will be used for data
- *                      transfer. The buffer size is chosen based on
- *                      the recommendation which we received in step (2).
+ * 1. Initialize our various state variables.
+ * 2. Ask the tape for its capabilities.
+ * 3. Allocate a buffer which will be used for data transfer. The buffer size
+ * is chosen based on the recommendation which we received in step 2.
  *
- *      Note that at this point ide.c already assigned us an irq, so that
- *      we can queue requests here and wait for their completion.
+ * Note that at this point ide.c already assigned us an irq, so that we can
+ * queue requests here and wait for their completion.
  */
-static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
+static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
 {
         unsigned long t1, tmid, tn, t;
         int speed;
-        struct idetape_id_gcw gcw;
         int stage_size;
+        u8 gcw[2];
         struct sysinfo si;
         u16 *ctl = (u16 *)&tape->caps[12];
 
-        spin_lock_init(&tape->spinlock);
+        spin_lock_init(&tape->lock);
         drive->dsc_overlap = 1;
         if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
                 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
@@ -3690,25 +3532,29 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
         tape->name[0] = 'h';
         tape->name[1] = 't';
         tape->name[2] = '0' + minor;
-        tape->chrdev_direction = idetape_direction_none;
+        tape->chrdev_dir = IDETAPE_DIR_NONE;
         tape->pc = tape->pc_stack;
         tape->max_insert_speed = 10000;
         tape->speed_control = 1;
         *((unsigned short *) &gcw) = drive->id->config;
-        if (gcw.drq_type == 1)
+
+        /* Command packet DRQ type */
+        if (((gcw[0] & 0x60) >> 5) == 1)
                 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
 
-        tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
-        
+        tape->min_pipeline = 10;
+        tape->max_pipeline = 10;
+        tape->max_stages   = 10;
+
         idetape_get_inquiry_results(drive);
         idetape_get_mode_sense_results(drive);
         ide_tape_get_bsize_from_bdesc(drive);
         tape->user_bs_factor = 1;
-        tape->stage_size = *ctl * tape->tape_block_size;
+        tape->stage_size = *ctl * tape->blk_size;
         while (tape->stage_size > 0xffff) {
                 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
                 *ctl /= 2;
-                tape->stage_size = *ctl * tape->tape_block_size;
+                tape->stage_size = *ctl * tape->blk_size;
         }
         stage_size = tape->stage_size;
         tape->pages_per_stage = stage_size / PAGE_SIZE;
@@ -3722,17 +3568,22 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
 
         tape->max_stages = speed * 1000 * 10 / tape->stage_size;
 
-        /*
-         *      Limit memory use for pipeline to 10% of physical memory
-         */
+        /* Limit memory use for pipeline to 10% of physical memory */
         si_meminfo(&si);
-        if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
-                tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
+        if (tape->max_stages * tape->stage_size >
+                        si.totalram * si.mem_unit / 10)
+                tape->max_stages =
+                        si.totalram * si.mem_unit / (10 * tape->stage_size);
+
         tape->max_stages   = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
         tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
-        tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
-        if (tape->max_stages == 0)
-                tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
+        tape->max_pipeline =
+                min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
+        if (tape->max_stages == 0) {
+                tape->max_stages   = 1;
+                tape->min_pipeline = 1;
+                tape->max_pipeline = 1;
+        }
 
         t1 = (tape->stage_size * HZ) / (speed * 1000);
         tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
@@ -3744,17 +3595,19 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
                 t = t1;
 
         /*
-         *      Ensure that the number we got makes sense; limit
-         *      it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
+         * Ensure that the number we got makes sense; limit it within
+         * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
          */
-        tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
+        tape->best_dsc_rw_freq = max_t(unsigned long,
+                                min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
+                                IDETAPE_DSC_RW_MIN);
         printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
                 "%dkB pipeline, %lums tDSC%s\n",
                 drive->name, tape->name, *(u16 *)&tape->caps[14],
                 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
                 tape->stage_size / 1024,
                 tape->max_stages * tape->stage_size / 1024,
-                tape->best_dsc_rw_frequency * 1000 / HZ,
+                tape->best_dsc_rw_freq * 1000 / HZ,
                 drive->using_dma ? ", DMA":"");
 
         idetape_add_settings(drive);
@@ -3782,7 +3635,8 @@ static void ide_tape_release(struct kref *kref)
         drive->dsc_overlap = 0;
         drive->driver_data = NULL;
         device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
-        device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
+        device_destroy(idetape_sysfs_class,
+                        MKDEV(IDETAPE_MAJOR, tape->minor + 128));
         idetape_devs[tape->minor] = NULL;
         g->private_data = NULL;
         put_disk(g);
@@ -3831,9 +3685,7 @@ static ide_driver_t idetape_driver = {
 #endif
 };
 
-/*
- *      Our character device supporting functions, passed to register_chrdev.
- */
+/* Our character device supporting functions, passed to register_chrdev. */
 static const struct file_operations idetape_fops = {
         .owner          = THIS_MODULE,
         .read           = idetape_chrdev_read,
@@ -3848,7 +3700,8 @@ static int idetape_open(struct inode *inode, struct file *filp)
         struct gendisk *disk = inode->i_bdev->bd_disk;
         struct ide_tape_obj *tape;
 
-        if (!(tape = ide_tape_get(disk)))
+        tape = ide_tape_get(disk);
+        if (!tape)
                 return -ENXIO;
 
         return 0;
@@ -3895,21 +3748,20 @@ static int ide_tape_probe(ide_drive_t *drive)
                 goto failed;
         if (drive->media != ide_tape)
                 goto failed;
-        if (!idetape_identify_device (drive)) {
-                printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
+        if (!idetape_identify_device(drive)) {
+                printk(KERN_ERR "ide-tape: %s: not supported by this version of"
+                                " the driver\n", drive->name);
                 goto failed;
         }
         if (drive->scsi) {
-                printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
+                printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi"
+                                 " emulation.\n", drive->name);
                 goto failed;
         }
-        if (strstr(drive->id->model, "OnStream DI-")) {
-                printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
-                printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
-        }
-        tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
+        tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
         if (tape == NULL) {
-                printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
+                printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
+                                drive->name);
                 goto failed;
         }
 
@@ -3955,10 +3807,7 @@ failed:
         return -ENODEV;
 }
 
-MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
-MODULE_LICENSE("GPL");
-
-static void __exit idetape_exit (void)
+static void __exit idetape_exit(void)
 {
         driver_unregister(&idetape_driver.gen_driver);
         class_destroy(idetape_sysfs_class);
@@ -3977,7 +3826,8 @@ static int __init idetape_init(void)
         }
 
         if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
-                printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
+                printk(KERN_ERR "ide-tape: Failed to register chrdev"
+                                " interface\n");
                 error = -EBUSY;
                 goto out_free_class;
         }
@@ -4000,3 +3850,5 @@ MODULE_ALIAS("ide:*m-tape*");
 module_init(idetape_init);
 module_exit(idetape_exit);
 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
+MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
+MODULE_LICENSE("GPL");