ide: add generic packet command representation ide_atapi_pc

This new struct unifies ide{-floppy,-tape,-scsi}'s view of a packet command. For now,
it represents the common denominator between the three drivers while adding driver-
specific members at the end of the struct which will be merged/simplified into the
generic ATAPI handling code in later steps, or removed completely.

Bart:
- move struct ide_atapi_pc outside of #ifdef/#endif CONFIG_IDE_PROC_FS

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 3b691cce00e1..e9b1def1e66a 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -595,6 +595,53 @@ int set_io_32bit(ide_drive_t *, int);
 int set_pio_mode(ide_drive_t *, int);
 int set_using_dma(ide_drive_t *, int);
 
+struct ide_atapi_pc {
+        /* actual packet bytes */
+        u8 c[12];
+        /* incremented on each retry */
+        int retries;
+        int error;
+
+        /* bytes to transfer */
+        int req_xfer;
+        /* bytes actually transferred */
+        int xferred;
+
+        /* data buffer */
+        u8 *buf;
+        /* current buffer position */
+        u8 *cur_pos;
+        int buf_size;
+        /* missing/available data on the current buffer */
+        int b_count;
+
+        /* the corresponding request */
+        struct request *rq;
+
+        unsigned long flags;
+
+        /*
+         * those are more or less driver-specific and some of them are subject
+         * to change/removal later.
+         */
+        u8 pc_buf[256];
+        void (*idefloppy_callback) (ide_drive_t *);
+        ide_startstop_t (*idetape_callback) (ide_drive_t *);
+
+        /* idetape only */
+        struct idetape_bh *bh;
+        char *b_data;
+
+        /* idescsi only for now */
+        struct scatterlist *sg;
+        unsigned int sg_cnt;
+
+        struct scsi_cmnd *scsi_cmd;
+        void (*done) (struct scsi_cmnd *);
+
+        unsigned long timeout;
+};
+
 #ifdef CONFIG_IDE_PROC_FS
 /*
  * configurable drive settings