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authorMartin K. Petersen <martin.petersen@oracle.com>2014-09-26 19:20:05 -0400
committerJens Axboe <axboe@fb.com>2014-09-27 09:14:55 -0600
commitaae7df50190a640e51bfe11c93f94741ac82ff0b (patch)
tree5c10de05e0ebb21e83c5785b2d03ff10ea9e60dc /block
parentb1f01388574c9329922f760fc2a7335c2d14b08b (diff)
downloadlinux-aae7df50190a640e51bfe11c93f94741ac82ff0b.tar.bz2
block: Integrity checksum flag
Make the choice of checksum a per-I/O property by introducing a flag that can be inspected by the SCSI layer. There are several reasons for this: 1. It allows us to switch choice of checksum without unloading and reloading the HBA driver. 2. During error recovery we need to be able to tell the HBA that checksums read from disk should not be verified and converted to IP checksums. 3. For error injection purposes we need to be able to write a bad guard tag to storage. Since the storage device only supports T10 CRC we need to be able to disable IP checksum conversion on the HBA. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/bio-integrity.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 26aa901b961f..8e0548484dd3 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -297,6 +297,9 @@ int bio_integrity_prep(struct bio *bio)
bip->bip_iter.bi_size = len;
bip_set_seed(bip, bio->bi_iter.bi_sector);
+ if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM)
+ bip->bip_flags |= BIP_IP_CHECKSUM;
+
/* Map it */
offset = offset_in_page(buf);
for (i = 0 ; i < nr_pages ; i++) {