1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 4163f2910e3d..f703f4827b6f 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -20,6 +20,7 @@
  */
 #define SD_MAX_RETRIES          5
 #define SD_PASSTHROUGH_RETRIES  1
+#define SD_MAX_MEDIUM_TIMEOUTS  2
 
 /*
  * Size of the initial data buffer for mode and read capacity data
@@ -59,6 +60,8 @@ struct scsi_disk {
         u32             unmap_alignment;
         u32             index;
         unsigned int    physical_block_size;
+        unsigned int    max_medium_access_timeouts;
+        unsigned int    medium_access_timed_out;
         u8              media_present;
         u8              write_prot;
         u8              protection_type;/* Data Integrity Field */
@@ -88,6 +91,38 @@ static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
                     (sdsk)->disk->disk_name, ##a) :                     \
         sdev_printk(prefix, (sdsk)->device, fmt, ##a)
 
+static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
+{
+        switch (scmd->cmnd[0]) {
+        case READ_6:
+        case READ_10:
+        case READ_12:
+        case READ_16:
+        case SYNCHRONIZE_CACHE:
+        case VERIFY:
+        case VERIFY_12:
+        case VERIFY_16:
+        case WRITE_6:
+        case WRITE_10:
+        case WRITE_12:
+        case WRITE_16:
+        case WRITE_SAME:
+        case WRITE_SAME_16:
+        case UNMAP:
+                return 1;
+        case VARIABLE_LENGTH_CMD:
+                switch (scmd->cmnd[9]) {
+                case READ_32:
+                case VERIFY_32:
+                case WRITE_32:
+                case WRITE_SAME_32:
+                        return 1;
+                }
+        }
+
+        return 0;
+}
+
 /*
  * A DIF-capable target device can be formatted with different
  * protection schemes.  Currently 0 through 3 are defined: