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| author | Coly Li <colyli@suse.de> | 2019-06-28 13:59:36 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-06-28 15:39:15 +0200 |
| commit | 383ff2183ad16a8842d1fbd9dd3e1cbd66813e64 (patch) | |
| tree | f344136d16b98123ef876d058aa7082b7226f8b6 /drivers/md/bcache | |
| parent | bcache: check CACHE_SET_IO_DISABLE in allocator code (diff) | |
| download | linux-383ff2183ad16a8842d1fbd9dd3e1cbd66813e64.tar.xz linux-383ff2183ad16a8842d1fbd9dd3e1cbd66813e64.zip | |
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>
Diffstat (limited to 'drivers/md/bcache')
| -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 4e5fc05720fc..54f8886b6177 100644 --- a/drivers/md/bcache/journal.c +++ b/drivers/md/bcache/journal.c @@ -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; |