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

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 <LinoSanfilippo@gmx.de>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Lino Sanfilippo 2011-06-14 17:29:45 +02:00 committed by Eric Paris
parent a0d271cbfe
commit d8153d4d8b
4 changed files with 13 additions and 14 deletions
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14
fs/notify/fanotify/fanotify_user.c
View File

@ -415,7 +415,7 @@ static int fanotify_release(struct inode *ignored, struct file *file)
wake_up(&group->fanotify_data.access_waitq);
#endif
/* matches the fanotify_init->fsnotify_alloc_group */
fsnotify_put_group(group);
fsnotify_destroy_group(group);
return 0;
}
@ -728,13 +728,13 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
break;
default:
fd = -EINVAL;
goto out_put_group;
goto out_destroy_group;
}
if (flags & FAN_UNLIMITED_QUEUE) {
fd = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out_put_group;
goto out_destroy_group;
group->max_events = UINT_MAX;
} else {
group->max_events = FANOTIFY_DEFAULT_MAX_EVENTS;
@ -743,7 +743,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
if (flags & FAN_UNLIMITED_MARKS) {
fd = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out_put_group;
goto out_destroy_group;
group->fanotify_data.max_marks = UINT_MAX;
} else {
group->fanotify_data.max_marks = FANOTIFY_DEFAULT_MAX_MARKS;
@ -751,12 +751,12 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags);
if (fd < 0)
goto out_put_group;
goto out_destroy_group;
return fd;
out_put_group:
fsnotify_put_group(group);
out_destroy_group:
fsnotify_destroy_group(group);
return fd;
}

2
fs/notify/group.c
View File

@ -50,7 +50,7 @@ void fsnotify_final_destroy_group(struct fsnotify_group *group)
* situtation, the fsnotify_final_destroy_group will get called when that final
* mark is freed.
*/
static void fsnotify_destroy_group(struct fsnotify_group *group)
void fsnotify_destroy_group(struct fsnotify_group *group)
{
/* clear all inode marks for this group */
fsnotify_clear_marks_by_group(group);

8
fs/notify/inotify/inotify_user.c
View File

@ -293,10 +293,8 @@ static int inotify_release(struct inode *ignored, struct file *file)
pr_debug("%s: group=%p\n", __func__, group);
fsnotify_clear_marks_by_group(group);
/* free this group, matching get was inotify_init->fsnotify_obtain_group */
fsnotify_put_group(group);
fsnotify_destroy_group(group);
return 0;
}
@ -712,7 +710,7 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events)
if (atomic_inc_return(&group->inotify_data.user->inotify_devs) >
inotify_max_user_instances) {
fsnotify_put_group(group);
fsnotify_destroy_group(group);
return ERR_PTR(-EMFILE);
}
@ -741,7 +739,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
ret = anon_inode_getfd("inotify", &inotify_fops, group,
O_RDONLY | flags);
if (ret < 0)
fsnotify_put_group(group);
fsnotify_destroy_group(group);
return ret;
}

3
include/linux/fsnotify_backend.h
View File

@ -364,7 +364,8 @@ static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode
extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
/* drop reference on a group from fsnotify_alloc_group */
extern void fsnotify_put_group(struct fsnotify_group *group);
/* destroy group */
extern void fsnotify_destroy_group(struct fsnotify_group *group);
/* take a reference to an event */
extern void fsnotify_get_event(struct fsnotify_event *event);
extern void fsnotify_put_event(struct fsnotify_event *event);