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authorMartin K. Petersen <martin.petersen@oracle.com>2008-07-17 12:28:34 +0400
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-07-26 23:14:55 +0400
commite0597d70012c82e16ee152270a55d89d8bf66693 (patch)
tree1752132ba07975a8db2bf93ddad88e1a6c06f4d2 /drivers/scsi/sd.h
parent511e44f42e3239a4df77b8e0e46d294d98a768ad (diff)
downloadlinux-e0597d70012c82e16ee152270a55d89d8bf66693.tar.xz
[SCSI] sd: Identify DIF protection type and application tag ownership
If a disk is formatted with protection information (Inquiry bit PROTECT=1) it is required to support Read Capacity(16). Force use of the 16-bit command in this case and extract the P_TYPE field which indicates whether the disk is formatted using DIF Type 1, 2 or 3. The ATO (App Tag Own) bit in the Control Mode Page indicates whether the storage device or the initiator own the contents of the DIF application tag. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/sd.h')
-rw-r--r--drivers/scsi/sd.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 03a3d45cfa42..86b18d4170fe 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -41,7 +41,9 @@ struct scsi_disk {
u32 index;
u8 media_present;
u8 write_prot;
+ u8 protection_type;/* Data Integrity Field */
unsigned previous_state : 1;
+ unsigned ATO : 1; /* state of disk ATO bit */
unsigned WCE : 1; /* state of disk WCE bit */
unsigned RCD : 1; /* state of disk RCD bit, unused */
unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
@@ -59,4 +61,25 @@ static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
(sdsk)->disk->disk_name, ##a) : \
sdev_printk(prefix, (sdsk)->device, fmt, ##a)
+/*
+ * A DIF-capable target device can be formatted with different
+ * protection schemes. Currently 0 through 3 are defined:
+ *
+ * Type 0 is regular (unprotected) I/O
+ *
+ * Type 1 defines the contents of the guard and reference tags
+ *
+ * Type 2 defines the contents of the guard and reference tags and
+ * uses 32-byte commands to seed the latter
+ *
+ * Type 3 defines the contents of the guard tag only
+ */
+
+enum sd_dif_target_protection_types {
+ SD_DIF_TYPE0_PROTECTION = 0x0,
+ SD_DIF_TYPE1_PROTECTION = 0x1,
+ SD_DIF_TYPE2_PROTECTION = 0x2,
+ SD_DIF_TYPE3_PROTECTION = 0x3,
+};
+
#endif /* _SCSI_DISK_H */