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dm: add integrity support

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This patch provides support for data integrity passthrough in the device
mapper.

 - If one or more component devices support integrity an integrity
   profile is preallocated for the DM device.

 - If all component devices have compatible profiles the DM device is
   flagged as capable.

 - Handle integrity metadata when splitting and cloning bios.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Martin K. Petersen
2009-04-09 00:27:12 +01:00
committed by Alasdair G Kergon
parent 577c9c456f
commit 9c47008d13
3 changed files with 76 additions and 0 deletions
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15
drivers/md/dm.c
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@ -700,6 +700,12 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
clone->bi_io_vec->bv_len = clone->bi_size;
clone->bi_flags |= 1 << BIO_CLONED;
if (bio_integrity(bio)) {
bio_integrity_clone(clone, bio, GFP_NOIO);
bio_integrity_trim(clone,
bio_sector_offset(bio, idx, offset), len);
}
return clone;
}
@ -721,6 +727,14 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
clone->bi_size = to_bytes(len);
clone->bi_flags &= ~(1 << BIO_SEG_VALID);
if (bio_integrity(bio)) {
bio_integrity_clone(clone, bio, GFP_NOIO);
if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
bio_integrity_trim(clone,
bio_sector_offset(bio, idx, 0), len);
}
return clone;
}
@ -1193,6 +1207,7 @@ static void free_dev(struct mapped_device *md)
mempool_destroy(md->tio_pool);
mempool_destroy(md->io_pool);
bioset_free(md->bs);
blk_integrity_unregister(md->disk);
del_gendisk(md->disk);
free_minor(minor);