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dm: make flush bios explicitly sync

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Commit b685d3d65a ("block: treat REQ_FUA and REQ_PREFLUSH as
synchronous") removed REQ_SYNC flag from WRITE_{FUA|PREFLUSH|...}
definitions.  generic_make_request_checks() however strips REQ_FUA and
REQ_PREFLUSH flags from a bio when the storage doesn't report volatile
write cache and thus write effectively becomes asynchronous which can
lead to performance regressions.

Fix the problem by making sure all bios which are synchronous are
properly marked with REQ_SYNC.

Fixes: b685d3d65a ("block: treat REQ_FUA and REQ_PREFLUSH as synchronous")
Cc: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Jan Kara
2017-05-31 09:44:32 +02:00
committed by Mike Snitzer
parent 8c1e2162f2
commit ff0361b34a
5 changed files with 7 additions and 5 deletions
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3
drivers/md/dm-integrity.c
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@@ -783,7 +783,8 @@ static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsi
for (i = 0; i < commit_sections; i++)
rw_section_mac(ic, commit_start + i, true);
}
rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, commit_sections, &io_comp);
rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start,
commit_sections, &io_comp);
} else {
unsigned to_end;
io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);