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fsnotify: implement ordering between notifiers

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fanotify needs to be able to specify that some groups get events before
others.  They use this idea to make sure that a hierarchical storage
manager gets access to files before programs which actually use them.  This
is purely infrastructure.  Everything will have a priority of 0, but the
infrastructure will exist for it to be non-zero.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris
2010-10-28 17:21:56 -04:00
parent 9343919c14
commit 6ad2d4e3e9
3 changed files with 20 additions and 3 deletions
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9
fs/notify/inode_mark.c
View File

@@ -177,7 +177,8 @@ void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *mark,
* Attach an initialized mark to a given inode.
* These marks may be used for the fsnotify backend to determine which
* event types should be delivered to which group and for which inodes. These
* marks are ordered according to the group's location in memory.
* marks are ordered according to priority, highest number first, and then by
* the group's location in memory.
*/
int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct fsnotify_group *group, struct inode *inode,
@@ -211,7 +212,11 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
goto out;
}
if (mark->group < lmark->group)
if (mark->group->priority < lmark->group->priority)
continue;
if ((mark->group->priority == lmark->group->priority) &&
(mark->group < lmark->group))
continue;
hlist_add_before_rcu(&mark->i.i_list, &lmark->i.i_list);

6
fs/notify/vfsmount_mark.c
View File

@@ -169,7 +169,11 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
goto out;
}
if (mark->group < lmark->group)
if (mark->group->priority < lmark->group->priority)
continue;
if ((mark->group->priority == lmark->group->priority) &&
(mark->group < lmark->group))
continue;
hlist_add_before_rcu(&mark->m.m_list, &lmark->m.m_list);