kernel.git/fs/notify/group.c, branch linux-3.13.y

fsnotify: make fasync generic for both inotify and fanotify

2012-12-11T18:44:36Z

inotify is supposed to support async signal notification when information is available on the inotify fd. This patch moves that support to generic fsnotify functions so it can be used by all notification mechanisms. Signed-off-by: Eric Paris

fsnotify: use a mutex instead of a spinlock to protect a groups mark list

2012-12-11T18:29:46Z

Replaces the groups mark_lock spinlock with a mutex. Using a mutex instead of a spinlock results in more flexibility (i.e it allows to sleep while the lock is held). Signed-off-by: Lino Sanfilippo Signed-off-by: Eric Paris

fsnotify: use reference counting for groups

2012-12-11T18:29:44Z

Get a group ref for each mark that is added to the groups list and release that ref when the mark is freed in fsnotify_put_mark(). We also use get a group reference for duplicated marks and for private event data. Now we dont free a group any more when the number of marks becomes 0 but when the groups ref count does. Since this will only happen when all marks are removed from a groups mark list, we dont have to set the groups number of marks to 1 at group creation. Beside clearing all marks in fsnotify_destroy_group() we do also flush the groups event queue. This is since events may hold references to groups (due to private event data) and we have to put those references first before we get a chance to put the final ref, which will result in a call to fsnotify_final_destroy_group(). Signed-off-by: Lino Sanfilippo Signed-off-by: Eric Paris

fsnotify: introduce fsnotify_get_group()

2012-12-11T18:29:44Z

Introduce fsnotify_get_group() which increments the reference counter of a group. Signed-off-by: Lino Sanfilippo Signed-off-by: Eric Paris

inotify, fanotify: replace fsnotify_put_group() with fsnotify_destroy_group()

2012-12-11T18:29:43Z

Currently in fsnotify_put_group() the ref count of a group is decremented and if it becomes 0 fsnotify_destroy_group() is called. Since a groups ref count is only at group creation set to 1 and never increased after that a call to fsnotify_put_group() always results in a call to fsnotify_destroy_group(). With this patch fsnotify_destroy_group() is called directly. Signed-off-by: Lino Sanfilippo Signed-off-by: Eric Paris

atomic: use

2011-07-26T23:49:47Z

This allows us to move duplicated code in (atomic_inc_not_zero() for now) to Signed-off-by: Arun Sharma Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Cc: Eric Dumazet Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

fsnotify: remove global fsnotify groups lists

2010-07-28T14:18:54Z

The global fsnotify groups lists were invented as a way to increase the performance of fsnotify by shortcutting events which were not interesting. With the changes to walk the object lists rather than global groups lists these shortcuts are not useful. Signed-off-by: Eric Paris

fsnotify: remove group->mask

2010-07-28T14:18:54Z

group->mask is now useless. It was originally a shortcut for fsnotify to save on performance. These checks are now redundant, so we remove them. Signed-off-by: Eric Paris

fsnotify: remove the global masks

2010-07-28T14:18:54Z

Because we walk the object->fsnotify_marks list instead of the global fsnotify groups list we don't need the fsnotify_inode_mask and fsnotify_vfsmount_mask as these were simply shortcuts in fsnotify() for performance. They are now extra checks, rip them out. Signed-off-by: Eric Paris

fsnotify: srcu to protect read side of inode and vfsmount locks

2010-07-28T14:18:52Z

Currently reading the inode->i_fsnotify_marks or vfsmount->mnt_fsnotify_marks lists are protected by a spinlock on both the read and the write side. This patch protects the read side of those lists with a new single srcu. Signed-off-by: Eric Paris