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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2014-09-26 19:20:05 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-27 09:14:55 -0600 |
| commit | aae7df50190a640e51bfe11c93f94741ac82ff0b (patch) | |
| tree | 5c10de05e0ebb21e83c5785b2d03ff10ea9e60dc /block/bio-integrity.c | |
| parent | b1f01388574c9329922f760fc2a7335c2d14b08b (diff) | |
| download | linux-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/bio-integrity.c')
| -rw-r--r-- | block/bio-integrity.c | 3 |
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++) { |