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| author | Coly Li <colyli@suse.de> | 2019-06-28 14:59:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 10:12:46 +0300 |
| commit | 7afcee1058a4a30972a19c4e37faafe435361133 (patch) | |
| tree | 02d78ab6f5679a760053a86ad1b1e57626699878 /drivers/md | |
| parent | 2e99386f735640d475c07fea556b0eb9cacc277e (diff) | |
| download | linux-7afcee1058a4a30972a19c4e37faafe435361133.tar.xz | |
bcache: check CACHE_SET_IO_DISABLE bit in bch_journal()
[ Upstream commit 383ff2183ad16a8842d1fbd9dd3e1cbd66813e64 ]
When too many I/O errors happen on cache set and CACHE_SET_IO_DISABLE
bit is set, bch_journal() may continue to work because the journaling
bkey might be still in write set yet. The caller of bch_journal() may
believe the journal still work but the truth is in-memory journal write
set won't be written into cache device any more. This behavior may
introduce potential inconsistent metadata status.
This patch checks CACHE_SET_IO_DISABLE bit at the head of bch_journal(),
if the bit is set, bch_journal() returns NULL immediately to notice
caller to know journal does not work.
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/journal.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c index 6c94fa007796..ac3cec56ec19 100644 --- a/drivers/md/bcache/journal.c +++ b/drivers/md/bcache/journal.c @@ -810,6 +810,10 @@ atomic_t *bch_journal(struct cache_set *c, struct journal_write *w; atomic_t *ret; + /* No journaling if CACHE_SET_IO_DISABLE set already */ + if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) + return NULL; + if (!CACHE_SYNC(&c->sb)) return NULL; |