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dm integrity: optimize writing dm-bufio buffers that are partially changed

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Rather than write the entire dm-bufio buffer when only a subset is
changed, improve dm-bufio (and dm-integrity) by only writing the subset
of the buffer that changed.

Update dm-integrity to make use of dm-bufio's new
dm_bufio_mark_partial_buffer_dirty() interface.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka
2017-04-30 17:31:22 -04:00
committed by Mike Snitzer
parent dc6364b517
commit 1e3b21c6fb
3 changed files with 77 additions and 29 deletions
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2
drivers/md/dm-integrity.c
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@@ -1040,7 +1040,7 @@ static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, se
memcpy(tag, dp, to_copy);
} else if (op == TAG_WRITE) {
memcpy(dp, tag, to_copy);
dm_bufio_mark_buffer_dirty(b);
dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
} else {
/* e.g.: op == TAG_CMP */
if (unlikely(memcmp(dp, tag, to_copy))) {