From: Coly Li colyli@suse.de
[ 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 --- drivers/md/bcache/journal.c | 4 ++++ 1 file changed, 4 insertions(+)
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;