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bcache: check CACHE_SET_IO_DISABLE bit in bch_journal() 

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>
This commit is contained in:
Coly Li 2019-06-28 19:59:36 +08:00 committed by Jens Axboe
parent e775339e1a
commit 383ff2183a
1 changed files with 4 additions and 0 deletions
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4
drivers/md/bcache/journal.c
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@ -811,6 +811,10 @@ 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;