diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-06-14 09:48:25 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-06-17 07:31:05 -0600 |
| commit | 5cf9c91ba927119fc6606b938b1895bb2459d3bc (patch) | |
| tree | c6d3d7b1806f35e8fff9c439285324c6feeddad5 /include | |
| parent | 50e34d78815e474d410f342fbe783b18192ca518 (diff) | |
| download | linux-5cf9c91ba927119fc6606b938b1895bb2459d3bc.tar.bz2 | |
block: serialize all debugfs operations using q->debugfs_mutex
Various places like I/O schedulers or the QOS infrastructure try to
register debugfs files on demans, which can race with creating and
removing the main queue debugfs directory. Use the existing
debugfs_mutex to serialize all debugfs operations that rely on
q->debugfs_dir or the directories hanging off it.
To make the teardown code a little simpler declare all debugfs dentry
pointers and not just the main one uncoditionally in blkdev.h.
Move debugfs_mutex next to the dentries that it protects and document
what it is used for.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220614074827.458955-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index bb6e3c31b3b7..73c886eba8e1 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -482,7 +482,6 @@ struct request_queue { #endif /* CONFIG_BLK_DEV_ZONED */ int node; - struct mutex debugfs_mutex; #ifdef CONFIG_BLK_DEV_IO_TRACE struct blk_trace __rcu *blk_trace; #endif @@ -526,11 +525,12 @@ struct request_queue { struct bio_set bio_split; struct dentry *debugfs_dir; - -#ifdef CONFIG_BLK_DEBUG_FS struct dentry *sched_debugfs_dir; struct dentry *rqos_debugfs_dir; -#endif + /* + * Serializes all debugfs metadata operations using the above dentries. + */ + struct mutex debugfs_mutex; bool mq_sysfs_init_done; |