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authorLinus Torvalds <torvalds@linux-foundation.org>2009-06-19 17:46:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-19 17:46:44 -0700
commitbee89ab228e6f51c4ddd3481b9bd491859a8ee7b (patch)
tree1810eef473172ab9e8ff52ded5e81f39eb8af748 /fs
parent5c6fb0059cec9a3c0f6d88a0ddf3d62ad323cd57 (diff)
parent528da3e9e237059a84a2625e942811cf824a6efd (diff)
downloadlinux-bee89ab228e6f51c4ddd3481b9bd491859a8ee7b.tar.gz
Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify
* 'for-linus' of git://git.infradead.org/users/eparis/notify: inotify: inotify_destroy_mark_entry could get called twice
Diffstat (limited to 'fs')
-rw-r--r--fs/notify/inotify/inotify.h3
-rw-r--r--fs/notify/inotify/inotify_fsnotify.c2
-rw-r--r--fs/notify/inotify/inotify_user.c32
3 files changed, 8 insertions, 29 deletions
diff --git a/fs/notify/inotify/inotify.h b/fs/notify/inotify/inotify.h
index ea2605a58b8..f234f3a4c8c 100644
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -15,7 +15,8 @@ struct inotify_inode_mark_entry {
int wd;
};
-extern void inotify_destroy_mark_entry(struct fsnotify_mark_entry *entry, struct fsnotify_group *group);
+extern void inotify_ignored_and_remove_idr(struct fsnotify_mark_entry *entry,
+ struct fsnotify_group *group);
extern void inotify_free_event_priv(struct fsnotify_event_private_data *event_priv);
extern const struct fsnotify_ops inotify_fsnotify_ops;
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 7ef75b83247..47cd258fd24 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -81,7 +81,7 @@ static int inotify_handle_event(struct fsnotify_group *group, struct fsnotify_ev
static void inotify_freeing_mark(struct fsnotify_mark_entry *entry, struct fsnotify_group *group)
{
- inotify_destroy_mark_entry(entry, group);
+ inotify_ignored_and_remove_idr(entry, group);
}
static bool inotify_should_send_event(struct fsnotify_group *group, struct inode *inode, __u32 mask)
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 982a412ac5b..ff231ad2389 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -363,39 +363,17 @@ static int inotify_find_inode(const char __user *dirname, struct path *path, uns
}
/*
- * When, for whatever reason, inotify is done with a mark (or what used to be a
- * watch) we need to remove that watch from the idr and we need to send IN_IGNORED
- * for the given wd.
- *
- * There is a bit of recursion here. The loop looks like:
- * inotify_destroy_mark_entry -> fsnotify_destroy_mark_by_entry ->
- * inotify_freeing_mark -> inotify_destory_mark_entry -> restart
- * But the loop is broken in 2 places. fsnotify_destroy_mark_by_entry sets
- * entry->group = NULL before the call to inotify_freeing_mark, so the if (egroup)
- * test below will not call back to fsnotify again. But even if that test wasn't
- * there this would still be safe since fsnotify_destroy_mark_by_entry() is
- * safe from recursion.
+ * Send IN_IGNORED for this wd, remove this wd from the idr, and drop the
+ * internal reference help on the mark because it is in the idr.
*/
-void inotify_destroy_mark_entry(struct fsnotify_mark_entry *entry, struct fsnotify_group *group)
+void inotify_ignored_and_remove_idr(struct fsnotify_mark_entry *entry,
+ struct fsnotify_group *group)
{
struct inotify_inode_mark_entry *ientry;
struct inotify_event_private_data *event_priv;
struct fsnotify_event_private_data *fsn_event_priv;
- struct fsnotify_group *egroup;
struct idr *idr;
- spin_lock(&entry->lock);
- egroup = entry->group;
-
- /* if egroup we aren't really done and something might still send events
- * for this inode, on the callback we'll send the IN_IGNORED */
- if (egroup) {
- spin_unlock(&entry->lock);
- fsnotify_destroy_mark_by_entry(entry);
- return;
- }
- spin_unlock(&entry->lock);
-
ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
event_priv = kmem_cache_alloc(event_priv_cachep, GFP_KERNEL);
@@ -699,7 +677,7 @@ SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd)
fsnotify_get_mark(entry);
spin_unlock(&group->inotify_data.idr_lock);
- inotify_destroy_mark_entry(entry, group);
+ fsnotify_destroy_mark_by_entry(entry);
fsnotify_put_mark(entry);
out: