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dm integrity: use bvec_kmap_local in integrity_metadata

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Using local kmaps slightly reduces the chances to stray writes, and
the bvec interface cleans up the code a little bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Christoph Hellwig 2021-10-19 15:44:03 +02:00 committed by Mike Snitzer
parent 089975379d
commit c12d205dae
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-integrity.c
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@ -1770,7 +1770,7 @@ static void integrity_metadata(struct work_struct *w)
char *mem, *checksums_ptr;
again:
mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
mem = bvec_kmap_local(&bv);
pos = 0;
checksums_ptr = checksums;
do {
@ -1780,7 +1780,7 @@ again:
pos += ic->sectors_per_block << SECTOR_SHIFT;
sector += ic->sectors_per_block;
} while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
kunmap_atomic(mem);
kunmap_local(mem);
r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);