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fsnotify: remove the global masks

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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 <eparis@redhat.com>
This commit is contained in:
Eric Paris 2010-07-28 10:18:39 -04:00
parent 2612abb51b
commit 03930979af
4 changed files with 2 additions and 48 deletions
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5
fs/notify/fsnotify.c
View File

@ -227,11 +227,6 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
if (mask & FS_MODIFY)
__fsnotify_flush_ignored_mask(to_tell, data, data_is);
/* if none of the directed listeners or vfsmount listeners care */
if (!(test_mask & fsnotify_inode_mask) &&
!(test_mask & fsnotify_vfsmount_mask))
return 0;
if (data_is == FSNOTIFY_EVENT_FILE)
mnt = ((struct file *)data)->f_path.mnt;

4
fs/notify/fsnotify.h
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@ -10,10 +10,6 @@
extern struct list_head fsnotify_inode_groups;
/* all groups which receive vfsmount fsnotify events */
extern struct list_head fsnotify_vfsmount_groups;
/* all bitwise OR of all event types (FS_*) for all fsnotify_inode_groups */
extern __u32 fsnotify_inode_mask;
/* all bitwise OR of all event types (FS_*) for all fsnotify_vfsmount_groups */
extern __u32 fsnotify_vfsmount_mask;
/* destroy all events sitting in this groups notification queue */
extern void fsnotify_flush_notify(struct fsnotify_group *group);

39
fs/notify/group.c
View File

@ -34,54 +34,21 @@ static DEFINE_MUTEX(fsnotify_grp_mutex);
LIST_HEAD(fsnotify_inode_groups);
/* all groups registered to receive mount point filesystem notifications */
LIST_HEAD(fsnotify_vfsmount_groups);
/* bitwise OR of all events (FS_*) interesting to some group on this system */
__u32 fsnotify_inode_mask;
/* bitwise OR of all events (FS_*) interesting to some group on this system */
__u32 fsnotify_vfsmount_mask;
/*
* When a new group registers or changes it's set of interesting events
* this function updates the fsnotify_mask to contain all interesting events
*/
void fsnotify_recalc_global_mask(void)
{
struct fsnotify_group *group;
__u32 inode_mask = 0;
__u32 vfsmount_mask = 0;
mutex_lock(&fsnotify_grp_mutex);
list_for_each_entry_rcu(group, &fsnotify_inode_groups, inode_group_list)
inode_mask |= group->mask;
list_for_each_entry_rcu(group, &fsnotify_vfsmount_groups, vfsmount_group_list)
vfsmount_mask |= group->mask;
fsnotify_inode_mask = inode_mask;
fsnotify_vfsmount_mask = vfsmount_mask;
mutex_unlock(&fsnotify_grp_mutex);
}
/*
* Update the group->mask by running all of the marks associated with this
* group and finding the bitwise | of all of the mark->mask. If we change
* the group->mask we need to update the global mask of events interesting
* to the system.
* group and finding the bitwise | of all of the mark->mask.
*/
void fsnotify_recalc_group_mask(struct fsnotify_group *group)
{
__u32 mask = 0;
__u32 old_mask = group->mask;
struct fsnotify_mark *mark;
spin_lock(&group->mark_lock);
list_for_each_entry(mark, &group->marks_list, g_list)
mask |= mark->mask;
spin_unlock(&group->mark_lock);
group->mask = mask;
if (old_mask != mask)
fsnotify_recalc_global_mask();
spin_unlock(&group->mark_lock);
}
void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
@ -217,8 +184,6 @@ void fsnotify_put_group(struct fsnotify_group *group)
mutex_unlock(&fsnotify_grp_mutex);
/* and now it is really dead. _Nothing_ could be seeing it */
fsnotify_recalc_global_mask();
fsnotify_destroy_group(group);
}

2
include/linux/fsnotify_backend.h
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@ -365,8 +365,6 @@ static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode
/* called from fsnotify listeners, such as fanotify or dnotify */
/* must call when a group changes its ->mask */
extern void fsnotify_recalc_global_mask(void);
/* get a reference to an existing or create a new group */
extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
/* run all marks associated with this group and update group->mask */