diff options
| author | Bart Van Assche | 2017-02-01 10:20:58 -0800 |
|---|---|---|
| committer | Jens Axboe | 2017-02-01 12:22:59 -0700 |
| commit | 8c0f14eab8f138689e68b3498c0c5fd6ff20a948 (patch) | |
| tree | 7cff92fac926029a2fc6b4fb1ae959b69e53325b | |
| parent | a1ae0f74a73fbd113647321c49032a561b3f3781 (diff) | |
blk-mq-debug: Make show() operations interruptible
Allow users to interrupt show operations instead of making a user
space process unkillable if ownership of q->sysfs_lock cannot be
obtained.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq-debugfs.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 0119ec533824..54b2f484eab4 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -178,13 +178,17 @@ static int hctx_tags_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; + int res; - mutex_lock(&q->sysfs_lock); + res = mutex_lock_interruptible(&q->sysfs_lock); + if (res) + goto out; if (hctx->tags) blk_mq_debugfs_tags_show(m, hctx->tags); mutex_unlock(&q->sysfs_lock); - return 0; +out: + return res; } static int hctx_tags_open(struct inode *inode, struct file *file) @@ -203,12 +207,17 @@ static int hctx_tags_bitmap_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; + int res; - mutex_lock(&q->sysfs_lock); + res = mutex_lock_interruptible(&q->sysfs_lock); + if (res) + goto out; if (hctx->tags) sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); mutex_unlock(&q->sysfs_lock); - return 0; + +out: + return res; } static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) @@ -227,13 +236,17 @@ static int hctx_sched_tags_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; + int res; - mutex_lock(&q->sysfs_lock); + res = mutex_lock_interruptible(&q->sysfs_lock); + if (res) + goto out; if (hctx->sched_tags) blk_mq_debugfs_tags_show(m, hctx->sched_tags); mutex_unlock(&q->sysfs_lock); - return 0; +out: + return res; } static int hctx_sched_tags_open(struct inode *inode, struct file *file) @@ -252,12 +265,17 @@ static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; + int res; - mutex_lock(&q->sysfs_lock); + res = mutex_lock_interruptible(&q->sysfs_lock); + if (res) + goto out; if (hctx->sched_tags) sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); mutex_unlock(&q->sysfs_lock); - return 0; + +out: + return res; } static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) |