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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2020-11-11 12:33:12 -0500 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-22 17:08:46 -0400 |
| commit | eb8e6e9ccbb4ba37c04a7cff032975b4df7d63c7 (patch) | |
| tree | 946041b0c3ce44e48e4968840527b11e2d1c25d8 /fs/bcachefs/fs.h | |
| parent | 6d9378f3dcd7b91effdc4ffe1da1a2e8987e9f1e (diff) | |
| download | lwn-eb8e6e9ccbb4ba37c04a7cff032975b4df7d63c7.tar.gz lwn-eb8e6e9ccbb4ba37c04a7cff032975b4df7d63c7.zip | |
bcachefs: Deadlock prevention for ei_pagecache_lock
In the dio write path, when get_user_pages() invokes the fault handler
we have a recursive locking situation - we have to handle the lock
ordering ourselves or we have a deadlock: this patch addresses that by
checking for locking ordering violations and doing the unlock/relock
dance if necessary.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/fs.h')
| -rw-r--r-- | fs/bcachefs/fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/bcachefs/fs.h b/fs/bcachefs/fs.h index b3a2993dd9bc..7c095b856b05 100644 --- a/fs/bcachefs/fs.h +++ b/fs/bcachefs/fs.h @@ -26,6 +26,7 @@ static inline void pagecache_lock_init(struct pagecache_lock *lock) } void bch2_pagecache_add_put(struct pagecache_lock *); +bool bch2_pagecache_add_tryget(struct pagecache_lock *); void bch2_pagecache_add_get(struct pagecache_lock *); void bch2_pagecache_block_put(struct pagecache_lock *); void bch2_pagecache_block_get(struct pagecache_lock *); |