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| author | Jan Kara <jack@suse.cz> | 2014-04-03 14:46:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-03 16:20:51 -0700 |
| commit | 9573f79355ff3711c98227d14a9b7f4cb3222b97 (patch) | |
| tree | b1ad8d66757b538cf67a570332ae263e2510fc50 | |
| parent | f083441ba86acb9e2ef9c1d1747725e488c8b1ff (diff) | |
| download | linux-rpi-9573f79355ff3711c98227d14a9b7f4cb3222b97.tar.gz linux-rpi-9573f79355ff3711c98227d14a9b7f4cb3222b97.tar.bz2 linux-rpi-9573f79355ff3711c98227d14a9b7f4cb3222b97.zip | |
fanotify: convert access_mutex to spinlock
access_mutex is used only to guard operations on access_list. There's
no need for sleeping within this lock so just make a spinlock out of it.
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Eric Paris <eparis@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/notify/fanotify/fanotify_user.c | 14 | ||||
| -rw-r--r-- | include/linux/fsnotify_backend.h | 2 |
2 files changed, 8 insertions, 8 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 8f5e85269110..2a57278afb80 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -134,7 +134,7 @@ static struct fanotify_perm_event_info *dequeue_event( { struct fanotify_perm_event_info *event, *return_e = NULL; - mutex_lock(&group->fanotify_data.access_mutex); + spin_lock(&group->fanotify_data.access_lock); list_for_each_entry(event, &group->fanotify_data.access_list, fae.fse.list) { if (event->fd != fd) @@ -144,7 +144,7 @@ static struct fanotify_perm_event_info *dequeue_event( return_e = event; break; } - mutex_unlock(&group->fanotify_data.access_mutex); + spin_unlock(&group->fanotify_data.access_lock); pr_debug("%s: found return_re=%p\n", __func__, return_e); @@ -213,10 +213,10 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group, pevent = FANOTIFY_PE(event); pevent->fd = fd; - mutex_lock(&group->fanotify_data.access_mutex); + spin_lock(&group->fanotify_data.access_lock); list_add_tail(&pevent->fae.fse.list, &group->fanotify_data.access_list); - mutex_unlock(&group->fanotify_data.access_mutex); + spin_unlock(&group->fanotify_data.access_lock); } #endif @@ -346,7 +346,7 @@ static int fanotify_release(struct inode *ignored, struct file *file) #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS struct fanotify_perm_event_info *event, *next; - mutex_lock(&group->fanotify_data.access_mutex); + spin_lock(&group->fanotify_data.access_lock); atomic_inc(&group->fanotify_data.bypass_perm); @@ -358,7 +358,7 @@ static int fanotify_release(struct inode *ignored, struct file *file) list_del_init(&event->fae.fse.list); event->response = FAN_ALLOW; } - mutex_unlock(&group->fanotify_data.access_mutex); + spin_unlock(&group->fanotify_data.access_lock); wake_up(&group->fanotify_data.access_waitq); #endif @@ -700,7 +700,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags) group->fanotify_data.f_flags = event_f_flags; #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS - mutex_init(&group->fanotify_data.access_mutex); + spin_lock_init(&group->fanotify_data.access_lock); init_waitqueue_head(&group->fanotify_data.access_waitq); INIT_LIST_HEAD(&group->fanotify_data.access_list); atomic_set(&group->fanotify_data.bypass_perm, 0); diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 64cf3ef50696..fc7718c6bd3e 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -178,7 +178,7 @@ struct fsnotify_group { struct fanotify_group_private_data { #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS /* allows a group to block waiting for a userspace response */ - struct mutex access_mutex; + spinlock_t access_lock; struct list_head access_list; wait_queue_head_t access_waitq; atomic_t bypass_perm; |