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fanotify: ignored_mask to ignore events

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When fanotify receives an event it will check event->mask & ~ignored_mask.
If no bits are left the event will not be sent.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2009-12-17 21:24:33 -05:00
parent 33af5e32e0
commit 32a4df13b8
1 changed files with 23 additions and 14 deletions
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37
fs/notify/fanotify/fanotify.c
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@ -100,31 +100,39 @@ static int fanotify_handle_event(struct fsnotify_group *group, struct fsnotify_e
}
static bool should_send_vfsmount_event(struct fsnotify_group *group, struct vfsmount *mnt,
__u32 mask)
struct inode *inode, __u32 mask)
{
struct fsnotify_mark *fsn_mark;
bool send;
struct fsnotify_mark *mnt_mark;
struct fsnotify_mark *inode_mark;
pr_debug("%s: group=%p vfsmount=%p mask=%x\n",
__func__, group, mnt, mask);
fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
if (!fsn_mark)
mnt_mark = fsnotify_find_vfsmount_mark(group, mnt);
if (!mnt_mark)
return false;
send = (mask & fsn_mark->mask);
mask &= mnt_mark->mask;
mask &= ~mnt_mark->ignored_mask;
if (mask) {
inode_mark = fsnotify_find_inode_mark(group, inode);
if (inode_mark) {
mask &= ~inode_mark->ignored_mask;
fsnotify_put_mark(inode_mark);
}
}
/* find took a reference */
fsnotify_put_mark(fsn_mark);
fsnotify_put_mark(mnt_mark);
return send;
return mask;
}
static bool should_send_inode_event(struct fsnotify_group *group, struct inode *inode,
__u32 mask)
{
struct fsnotify_mark *fsn_mark;
bool send;
pr_debug("%s: group=%p inode=%p mask=%x\n",
__func__, group, inode, mask);
@ -137,20 +145,21 @@ static bool should_send_inode_event(struct fsnotify_group *group, struct inode *
* events on the child, don't send it! */
if ((mask & FS_EVENT_ON_CHILD) &&
!(fsn_mark->mask & FS_EVENT_ON_CHILD)) {
send = false;
mask = 0;
} else {
/*
* We care about children, but do we care about this particular
* type of event?
*/
mask = (mask & ~FS_EVENT_ON_CHILD);
send = (fsn_mark->mask & mask);
mask &= ~FS_EVENT_ON_CHILD;
mask &= fsn_mark->mask;
mask &= ~fsn_mark->ignored_mask;
}
/* find took a reference */
fsnotify_put_mark(fsn_mark);
return send;
return mask;
}
static bool fanotify_should_send_event(struct fsnotify_group *group, struct inode *to_tell,
@ -170,7 +179,7 @@ static bool fanotify_should_send_event(struct fsnotify_group *group, struct inod
return false;
if (mnt)
return should_send_vfsmount_event(group, mnt, mask);
return should_send_vfsmount_event(group, mnt, to_tell, mask);
else
return should_send_inode_event(group, to_tell, mask);
}