Merge branch 'linus' into stackprotector

Conflicts:
	arch/x86/kernel/Makefile
	include/asm-x86/pda.h

1 files changed, 215 insertions, 44 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d2a1b71e93c..a92d9e4ea96 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -16,14 +16,15 @@
 #include <linux/bio.h>
 #include <linux/module.h>
 #include <linux/stringify.h>
+#include <linux/gfp.h>
 #include <linux/bsg.h>
+#include <linux/smp.h>
 
 #include <asm/scatterlist.h>
 
 struct scsi_ioctl_command;
 
 struct request_queue;
-typedef struct request_queue request_queue_t __deprecated;
 struct elevator_queue;
 typedef struct elevator_queue elevator_t;
 struct request_pm_state;
@@ -34,12 +35,6 @@ struct sg_io_hdr;
 #define BLKDEV_MIN_RQ   4
 #define BLKDEV_MAX_RQ   128     /* Default maximum */
 
-int put_io_context(struct io_context *ioc);
-void exit_io_context(void);
-struct io_context *get_io_context(gfp_t gfp_flags, int node);
-struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
-void copy_io_context(struct io_context **pdst, struct io_context **psrc);
-
 struct request;
 typedef void (rq_end_io_fn)(struct request *, int);
 
@@ -61,7 +56,6 @@ enum rq_cmd_type_bits {
         REQ_TYPE_PM_SUSPEND,            /* suspend request */
         REQ_TYPE_PM_RESUME,             /* resume request */
         REQ_TYPE_PM_SHUTDOWN,           /* shutdown request */
-        REQ_TYPE_FLUSH,                 /* flush request */
         REQ_TYPE_SPECIAL,               /* driver defined type */
         REQ_TYPE_LINUX_BLOCK,           /* generic block layer message */
         /*
@@ -83,19 +77,18 @@ enum rq_cmd_type_bits {
  *
  */
 enum {
-        /*
-         * just examples for now
-         */
         REQ_LB_OP_EJECT = 0x40,         /* eject request */
-        REQ_LB_OP_FLUSH = 0x41,         /* flush device */
+        REQ_LB_OP_FLUSH = 0x41,         /* flush request */
+        REQ_LB_OP_DISCARD = 0x42,       /* discard sectors */
 };
 
 /*
- * request type modified bits. first three bits match BIO_RW* bits, important
+ * request type modified bits. first two bits match BIO_RW* bits, important
  */
 enum rq_flag_bits {
         __REQ_RW,               /* not set, read. set, write */
         __REQ_FAILFAST,         /* no low level driver retries */
+        __REQ_DISCARD,          /* request to discard sectors */
         __REQ_SORTED,           /* elevator knows about this request */
         __REQ_SOFTBARRIER,      /* may not be passed by ioscheduler */
         __REQ_HARDBARRIER,      /* may not be passed by drive either */
@@ -113,10 +106,12 @@ enum rq_flag_bits {
         __REQ_ALLOCED,          /* request came from our alloc pool */
         __REQ_RW_META,          /* metadata io request */
         __REQ_COPY_USER,        /* contains copies of user pages */
+        __REQ_INTEGRITY,        /* integrity metadata has been remapped */
         __REQ_NR_BITS,          /* stops here */
 };
 
 #define REQ_RW          (1 << __REQ_RW)
+#define REQ_DISCARD     (1 << __REQ_DISCARD)
 #define REQ_FAILFAST    (1 << __REQ_FAILFAST)
 #define REQ_SORTED      (1 << __REQ_SORTED)
 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
@@ -135,6 +130,7 @@ enum rq_flag_bits {
 #define REQ_ALLOCED     (1 << __REQ_ALLOCED)
 #define REQ_RW_META     (1 << __REQ_RW_META)
 #define REQ_COPY_USER   (1 << __REQ_COPY_USER)
+#define REQ_INTEGRITY   (1 << __REQ_INTEGRITY)
 
 #define BLK_MAX_CDB     16
 
@@ -145,12 +141,14 @@ enum rq_flag_bits {
  */
 struct request {
         struct list_head queuelist;
-        struct list_head donelist;
+        struct call_single_data csd;
+        int cpu;
 
         struct request_queue *q;
 
         unsigned int cmd_flags;
         enum rq_cmd_type_bits cmd_type;
+        unsigned long atomic_flags;
 
         /* Maintain bio traversal state for part by part I/O submission.
          * hard_* are block layer internals, no driver should touch them!
@@ -195,13 +193,6 @@ struct request {
          */
         unsigned short nr_phys_segments;
 
-        /* Number of scatter-gather addr+len pairs after
-         * physical and DMA remapping hardware coalescing is performed.
-         * This is the number of scatter-gather entries the driver
-         * will actually have to deal with after DMA mapping is done.
-         */
-        unsigned short nr_hw_segments;
-
         unsigned short ioprio;
 
         void *special;
@@ -225,6 +216,8 @@ struct request {
         void *data;
         void *sense;
 
+        unsigned long deadline;
+        struct list_head timeout_list;
         unsigned int timeout;
         int retries;
 
@@ -238,6 +231,11 @@ struct request {
         struct request *next_rq;
 };
 
+static inline unsigned short req_get_ioprio(struct request *req)
+{
+        return req->ioprio;
+}
+
 /*
  * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
  * requests. Some step values could eventually be made generic.
@@ -257,12 +255,29 @@ typedef void (request_fn_proc) (struct request_queue *q);
 typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
 typedef int (prep_rq_fn) (struct request_queue *, struct request *);
 typedef void (unplug_fn) (struct request_queue *);
+typedef int (prepare_discard_fn) (struct request_queue *, struct request *);
 
 struct bio_vec;
-typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *);
+struct bvec_merge_data {
+        struct block_device *bi_bdev;
+        sector_t bi_sector;
+        unsigned bi_size;
+        unsigned long bi_rw;
+};
+typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
+                             struct bio_vec *);
 typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
 typedef void (softirq_done_fn)(struct request *);
 typedef int (dma_drain_needed_fn)(struct request *);
+typedef int (lld_busy_fn) (struct request_queue *q);
+
+enum blk_eh_timer_return {
+        BLK_EH_NOT_HANDLED,
+        BLK_EH_HANDLED,
+        BLK_EH_RESET_TIMER,
+};
+
+typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
 
 enum blk_queue_state {
         Queue_down,
@@ -278,6 +293,15 @@ struct blk_queue_tag {
         atomic_t refcnt;                /* map can be shared */
 };
 
+#define BLK_SCSI_MAX_CMDS       (256)
+#define BLK_SCSI_CMD_PER_LONG   (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
+
+struct blk_cmd_filter {
+        unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
+        unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
+        struct kobject kobj;
+};
+
 struct request_queue
 {
         /*
@@ -296,10 +320,13 @@ struct request_queue
         make_request_fn         *make_request_fn;
         prep_rq_fn              *prep_rq_fn;
         unplug_fn               *unplug_fn;
+        prepare_discard_fn      *prepare_discard_fn;
         merge_bvec_fn           *merge_bvec_fn;
         prepare_flush_fn        *prepare_flush_fn;
         softirq_done_fn         *softirq_done_fn;
+        rq_timed_out_fn         *rq_timed_out_fn;
         dma_drain_needed_fn     *dma_drain_needed;
+        lld_busy_fn             *lld_busy_fn;
 
         /*
          * Dispatch queue sorting
@@ -374,6 +401,10 @@ struct request_queue
         unsigned int            nr_sorted;
         unsigned int            in_flight;
 
+        unsigned int            rq_timeout;
+        struct timer_list       timeout;
+        struct list_head        timeout_list;
+
         /*
          * sg stuff
          */
@@ -396,6 +427,7 @@ struct request_queue
 #if defined(CONFIG_BLK_DEV_BSG)
         struct bsg_class_device bsg_dev;
 #endif
+        struct blk_cmd_filter cmd_filter;
 };
 
 #define QUEUE_FLAG_CLUSTER      0       /* cluster several segments into 1 */
@@ -409,6 +441,10 @@ struct request_queue
 #define QUEUE_FLAG_ELVSWITCH    8       /* don't use elevator, just do FIFO */
 #define QUEUE_FLAG_BIDI         9       /* queue supports bidi requests */
 #define QUEUE_FLAG_NOMERGES    10       /* disable merge attempts */
+#define QUEUE_FLAG_SAME_COMP   11       /* force complete on same CPU */
+#define QUEUE_FLAG_FAIL_IO     12       /* fake timeout */
+#define QUEUE_FLAG_STACKABLE   13       /* supports request stacking */
+#define QUEUE_FLAG_NONROT      14       /* non-rotational device (SSD) */
 
 static inline int queue_is_locked(struct request_queue *q)
 {
@@ -426,6 +462,32 @@ static inline void queue_flag_set_unlocked(unsigned int flag,
         __set_bit(flag, &q->queue_flags);
 }
 
+static inline int queue_flag_test_and_clear(unsigned int flag,
+                                            struct request_queue *q)
+{
+        WARN_ON_ONCE(!queue_is_locked(q));
+
+        if (test_bit(flag, &q->queue_flags)) {
+                __clear_bit(flag, &q->queue_flags);
+                return 1;
+        }
+
+        return 0;
+}
+
+static inline int queue_flag_test_and_set(unsigned int flag,
+                                          struct request_queue *q)
+{
+        WARN_ON_ONCE(!queue_is_locked(q));
+
+        if (!test_bit(flag, &q->queue_flags)) {
+                __set_bit(flag, &q->queue_flags);
+                return 0;
+        }
+
+        return 1;
+}
+
 static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
 {
         WARN_ON_ONCE(!queue_is_locked(q));
@@ -488,7 +550,10 @@ enum {
 #define blk_queue_tagged(q)     test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
 #define blk_queue_stopped(q)    test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
 #define blk_queue_nomerges(q)   test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
+#define blk_queue_nonrot(q)     test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
 #define blk_queue_flushing(q)   ((q)->ordseq)
+#define blk_queue_stackable(q)  \
+        test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
 
 #define blk_fs_request(rq)      ((rq)->cmd_type == REQ_TYPE_FS)
 #define blk_pc_request(rq)      ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
@@ -498,16 +563,18 @@ enum {
 #define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST)
 #define blk_rq_started(rq)      ((rq)->cmd_flags & REQ_STARTED)
 
-#define blk_account_rq(rq)      (blk_rq_started(rq) && blk_fs_request(rq))
+#define blk_account_rq(rq)      (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) 
 
 #define blk_pm_suspend_request(rq)      ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND)
 #define blk_pm_resume_request(rq)       ((rq)->cmd_type == REQ_TYPE_PM_RESUME)
 #define blk_pm_request(rq)      \
         (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
 
+#define blk_rq_cpu_valid(rq)    ((rq)->cpu != -1)
 #define blk_sorted_rq(rq)       ((rq)->cmd_flags & REQ_SORTED)
 #define blk_barrier_rq(rq)      ((rq)->cmd_flags & REQ_HARDBARRIER)
 #define blk_fua_rq(rq)          ((rq)->cmd_flags & REQ_FUA)
+#define blk_discard_rq(rq)      ((rq)->cmd_flags & REQ_DISCARD)
 #define blk_bidi_rq(rq)         ((rq)->next_rq != NULL)
 #define blk_empty_barrier(rq)   (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
 /* rq->queuelist of dequeued request must be list_empty() */
@@ -554,7 +621,8 @@ static inline void blk_clear_queue_full(struct request_queue *q, int rw)
 #define RQ_NOMERGE_FLAGS        \
         (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER)
 #define rq_mergeable(rq)        \
-        (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq)))
+        (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
+         (blk_discard_rq(rq) || blk_fs_request((rq))))
 
 /*
  * q->prep_rq_fn return values
@@ -599,6 +667,12 @@ static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
 }
 #endif /* CONFIG_MMU */
 
+struct rq_map_data {
+        struct page **pages;
+        int page_order;
+        int nr_entries;
+};
+
 struct req_iterator {
         int i;
         struct bio *bio;
@@ -623,11 +697,15 @@ extern void generic_make_request(struct bio *bio);
 extern void blk_rq_init(struct request_queue *q, struct request *rq);
 extern void blk_put_request(struct request *);
 extern void __blk_put_request(struct request_queue *, struct request *);
-extern void blk_end_sync_rq(struct request *rq, int error);
 extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
 extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
 extern void blk_requeue_request(struct request_queue *, struct request *);
+extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
+extern int blk_lld_busy(struct request_queue *q);
+extern int blk_insert_cloned_request(struct request_queue *q,
+                                     struct request *rq);
 extern void blk_plug_device(struct request_queue *);
+extern void blk_plug_device_unlocked(struct request_queue *);
 extern int blk_remove_plug(struct request_queue *);
 extern void blk_recount_segments(struct request_queue *, struct bio *);
 extern int scsi_cmd_ioctl(struct file *, struct request_queue *,
@@ -667,16 +745,18 @@ extern void __blk_stop_queue(struct request_queue *q);
 extern void __blk_run_queue(struct request_queue *);
 extern void blk_run_queue(struct request_queue *);
 extern void blk_start_queueing(struct request_queue *);
-extern int blk_rq_map_user(struct request_queue *, struct request *, void __user *, unsigned long);
+extern int blk_rq_map_user(struct request_queue *, struct request *,
+                           struct rq_map_data *, void __user *, unsigned long,
+                           gfp_t);
 extern int blk_rq_unmap_user(struct bio *);
 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
-                               struct sg_iovec *, int, unsigned int);
+                               struct rq_map_data *, struct sg_iovec *, int,
+                               unsigned int, gfp_t);
 extern int blk_execute_rq(struct request_queue *, struct gendisk *,
                           struct request *, int);
 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
                                   struct request *, int, rq_end_io_fn *);
-extern int blk_verify_command(unsigned char *, int);
 extern void blk_unplug(struct request_queue *q);
 
 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
@@ -713,12 +793,15 @@ extern int __blk_end_request(struct request *rq, int error,
 extern int blk_end_bidi_request(struct request *rq, int error,
                                 unsigned int nr_bytes, unsigned int bidi_bytes);
 extern void end_request(struct request *, int);
-extern void end_queued_request(struct request *, int);
-extern void end_dequeued_request(struct request *, int);
 extern int blk_end_request_callback(struct request *rq, int error,
                                 unsigned int nr_bytes,
                                 int (drv_callback)(struct request *));
 extern void blk_complete_request(struct request *);
+extern void __blk_complete_request(struct request *);
+extern void blk_abort_request(struct request *);
+extern void blk_abort_queue(struct request_queue *);
+extern void blk_update_request(struct request *rq, int error,
+                               unsigned int nr_bytes);
 
 /*
  * blk_end_request() takes bytes instead of sectors as a complete size.
@@ -749,15 +832,20 @@ extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
 extern void blk_queue_hardsect_size(struct request_queue *, unsigned short);
 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
 extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
+extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
 extern int blk_queue_dma_drain(struct request_queue *q,
                                dma_drain_needed_fn *dma_drain_needed,
                                void *buf, unsigned int size);
+extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
 extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
 extern void blk_queue_dma_alignment(struct request_queue *, int);
 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
+extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *);
+extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
+extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
 extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
 extern int blk_do_ordered(struct request_queue *, struct request **);
@@ -779,8 +867,6 @@ extern void blk_put_queue(struct request_queue *);
 /*
  * tag stuff
  */
-#define blk_queue_tag_depth(q)          ((q)->queue_tags->busy)
-#define blk_queue_tag_queue(q)          ((q)->queue_tags->busy < (q)->queue_tags->max_depth)
 #define blk_rq_tagged(rq)               ((rq)->cmd_flags & REQ_QUEUED)
 extern int blk_queue_start_tag(struct request_queue *, struct request *);
 extern struct request *blk_queue_find_tag(struct request_queue *, int);
@@ -801,6 +887,23 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
 }
 
 extern int blkdev_issue_flush(struct block_device *, sector_t *);
+extern int blkdev_issue_discard(struct block_device *,
+                                sector_t sector, sector_t nr_sects, gfp_t);
+
+static inline int sb_issue_discard(struct super_block *sb,
+                                   sector_t block, sector_t nr_blocks)
+{
+        block <<= (sb->s_blocksize_bits - 9);
+        nr_blocks <<= (sb->s_blocksize_bits - 9);
+        return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL);
+}
+
+/*
+* command filter functions
+*/
+extern int blk_verify_command(struct blk_cmd_filter *filter,
+                              unsigned char *cmd, int has_write_perm);
+extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter);
 
 #define MAX_PHYS_SEGMENTS 128
 #define MAX_HW_SEGMENTS 128
@@ -831,6 +934,13 @@ static inline int queue_dma_alignment(struct request_queue *q)
         return q ? q->dma_alignment : 511;
 }
 
+static inline int blk_rq_aligned(struct request_queue *q, void *addr,
+                                 unsigned int len)
+{
+        unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
+        return !((unsigned long)addr & alignment) && !(len & alignment);
+}
+
 /* assumes size > 256 */
 static inline unsigned int blksize_bits(unsigned int size)
 {
@@ -857,7 +967,7 @@ static inline void put_dev_sector(Sector p)
 }
 
 struct work_struct;
-int kblockd_schedule_work(struct work_struct *work);
+int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
 void kblockd_flush_work(struct work_struct *work);
 
 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
@@ -865,28 +975,89 @@ void kblockd_flush_work(struct work_struct *work);
 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
         MODULE_ALIAS("block-major-" __stringify(major) "-*")
 
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
 
-#else /* CONFIG_BLOCK */
-/*
- * stubs for when the block layer is configured out
- */
-#define buffer_heads_over_limit 0
+#define INTEGRITY_FLAG_READ     2       /* verify data integrity on read */
+#define INTEGRITY_FLAG_WRITE    4       /* generate data integrity on write */
 
-static inline long nr_blockdev_pages(void)
+struct blk_integrity_exchg {
+        void                    *prot_buf;
+        void                    *data_buf;
+        sector_t                sector;
+        unsigned int            data_size;
+        unsigned short          sector_size;
+        const char              *disk_name;
+};
+
+typedef void (integrity_gen_fn) (struct blk_integrity_exchg *);
+typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *);
+typedef void (integrity_set_tag_fn) (void *, void *, unsigned int);
+typedef void (integrity_get_tag_fn) (void *, void *, unsigned int);
+
+struct blk_integrity {
+        integrity_gen_fn        *generate_fn;
+        integrity_vrfy_fn       *verify_fn;
+        integrity_set_tag_fn    *set_tag_fn;
+        integrity_get_tag_fn    *get_tag_fn;
+
+        unsigned short          flags;
+        unsigned short          tuple_size;
+        unsigned short          sector_size;
+        unsigned short          tag_size;
+
+        const char              *name;
+
+        struct kobject          kobj;
+};
+
+extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
+extern void blk_integrity_unregister(struct gendisk *);
+extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
+extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
+extern int blk_rq_count_integrity_sg(struct request *);
+
+static inline
+struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
 {
-        return 0;
+        return bdev->bd_disk->integrity;
 }
 
-static inline void exit_io_context(void)
+static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
 {
+        return disk->integrity;
 }
 
-struct io_context;
-static inline int put_io_context(struct io_context *ioc)
+static inline int blk_integrity_rq(struct request *rq)
 {
-        return 1;
+        if (rq->bio == NULL)
+                return 0;
+
+        return bio_integrity(rq->bio);
 }
 
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+
+#define blk_integrity_rq(rq)                    (0)
+#define blk_rq_count_integrity_sg(a)            (0)
+#define blk_rq_map_integrity_sg(a, b)           (0)
+#define bdev_get_integrity(a)                   (0)
+#define blk_get_integrity(a)                    (0)
+#define blk_integrity_compare(a, b)             (0)
+#define blk_integrity_register(a, b)            (0)
+#define blk_integrity_unregister(a)             do { } while (0);
+
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
+#else /* CONFIG_BLOCK */
+/*
+ * stubs for when the block layer is configured out
+ */
+#define buffer_heads_over_limit 0
+
+static inline long nr_blockdev_pages(void)
+{
+        return 0;
+}
 
 #endif /* CONFIG_BLOCK */