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reiserfs: Make flush bios explicitely sync 

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
CC: reiserfs-devel@vger.kernel.org
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2017-05-02 13:16:18 +02:00
parent 0f0b9b63e1
commit d8747d642e
1 changed files with 2 additions and 2 deletions
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4
fs/reiserfs/journal.c
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@ -1112,7 +1112,7 @@ static int flush_commit_list(struct super_block *s,
depth = reiserfs_write_unlock_nested(s);
if (reiserfs_barrier_flush(s))
__sync_dirty_buffer(jl->j_commit_bh,
REQ_PREFLUSH | REQ_FUA);
REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
else
sync_dirty_buffer(jl->j_commit_bh);
reiserfs_write_lock_nested(s, depth);
@ -1271,7 +1271,7 @@ static int _update_journal_header_block(struct super_block *sb,
if (reiserfs_barrier_flush(sb))
__sync_dirty_buffer(journal->j_header_bh,
REQ_PREFLUSH | REQ_FUA);
REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
else
sync_dirty_buffer(journal->j_header_bh);