fanotify: ignored_mask to ignore events
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>
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commit
32a4df13b8
1 changed files with 23 additions and 14 deletions
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@ -100,31 +100,39 @@ static int fanotify_handle_event(struct fsnotify_group *group, struct fsnotify_e
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}
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static bool should_send_vfsmount_event(struct fsnotify_group *group, struct vfsmount *mnt,
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__u32 mask)
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struct inode *inode, __u32 mask)
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{
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struct fsnotify_mark *fsn_mark;
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bool send;
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struct fsnotify_mark *mnt_mark;
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struct fsnotify_mark *inode_mark;
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pr_debug("%s: group=%p vfsmount=%p mask=%x\n",
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__func__, group, mnt, mask);
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fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
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if (!fsn_mark)
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mnt_mark = fsnotify_find_vfsmount_mark(group, mnt);
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if (!mnt_mark)
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return false;
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send = (mask & fsn_mark->mask);
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mask &= mnt_mark->mask;
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mask &= ~mnt_mark->ignored_mask;
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if (mask) {
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inode_mark = fsnotify_find_inode_mark(group, inode);
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if (inode_mark) {
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mask &= ~inode_mark->ignored_mask;
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fsnotify_put_mark(inode_mark);
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}
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}
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/* find took a reference */
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fsnotify_put_mark(fsn_mark);
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fsnotify_put_mark(mnt_mark);
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return send;
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return mask;
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}
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static bool should_send_inode_event(struct fsnotify_group *group, struct inode *inode,
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__u32 mask)
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{
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struct fsnotify_mark *fsn_mark;
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bool send;
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pr_debug("%s: group=%p inode=%p mask=%x\n",
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__func__, group, inode, mask);
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@ -137,20 +145,21 @@ static bool should_send_inode_event(struct fsnotify_group *group, struct inode *
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* events on the child, don't send it! */
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if ((mask & FS_EVENT_ON_CHILD) &&
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!(fsn_mark->mask & FS_EVENT_ON_CHILD)) {
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send = false;
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mask = 0;
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} else {
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/*
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* We care about children, but do we care about this particular
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* type of event?
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*/
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mask = (mask & ~FS_EVENT_ON_CHILD);
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send = (fsn_mark->mask & mask);
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mask &= ~FS_EVENT_ON_CHILD;
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mask &= fsn_mark->mask;
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mask &= ~fsn_mark->ignored_mask;
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}
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/* find took a reference */
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fsnotify_put_mark(fsn_mark);
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return send;
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return mask;
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}
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static bool fanotify_should_send_event(struct fsnotify_group *group, struct inode *to_tell,
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@ -170,7 +179,7 @@ static bool fanotify_should_send_event(struct fsnotify_group *group, struct inod
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return false;
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if (mnt)
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return should_send_vfsmount_event(group, mnt, mask);
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return should_send_vfsmount_event(group, mnt, to_tell, mask);
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else
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return should_send_inode_event(group, to_tell, mask);
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}
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