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-rw-r--r--fs/notify/inotify/inotify_user.c79
1 files changed, 49 insertions, 30 deletions
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index aff4214f16c3..726118a5845b 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -365,6 +365,17 @@ static int inotify_find_inode(const char __user *dirname, struct path *path, uns
return error;
}
+static void inotify_remove_from_idr(struct fsnotify_group *group,
+ struct inotify_inode_mark_entry *ientry)
+{
+ struct idr *idr;
+
+ spin_lock(&group->inotify_data.idr_lock);
+ idr = &group->inotify_data.idr;
+ idr_remove(idr, ientry->wd);
+ spin_unlock(&group->inotify_data.idr_lock);
+ ientry->wd = -1;
+}
/*
* 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.
@@ -375,7 +386,6 @@ void inotify_ignored_and_remove_idr(struct fsnotify_mark_entry *entry,
struct inotify_inode_mark_entry *ientry;
struct inotify_event_private_data *event_priv;
struct fsnotify_event_private_data *fsn_event_priv;
- struct idr *idr;
ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
@@ -397,10 +407,7 @@ void inotify_ignored_and_remove_idr(struct fsnotify_mark_entry *entry,
skip_send_ignore:
/* remove this entry from the idr */
- spin_lock(&group->inotify_data.idr_lock);
- idr = &group->inotify_data.idr;
- idr_remove(idr, ientry->wd);
- spin_unlock(&group->inotify_data.idr_lock);
+ inotify_remove_from_idr(group, ientry);
/* removed from idr, drop that reference */
fsnotify_put_mark(entry);
@@ -420,6 +427,7 @@ static int inotify_update_watch(struct fsnotify_group *group, struct inode *inod
{
struct fsnotify_mark_entry *entry = NULL;
struct inotify_inode_mark_entry *ientry;
+ struct inotify_inode_mark_entry *tmp_ientry;
int ret = 0;
int add = (arg & IN_MASK_ADD);
__u32 mask;
@@ -430,50 +438,60 @@ static int inotify_update_watch(struct fsnotify_group *group, struct inode *inod
if (unlikely(!mask))
return -EINVAL;
- ientry = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL);
- if (unlikely(!ientry))
+ tmp_ientry = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL);
+ if (unlikely(!tmp_ientry))
return -ENOMEM;
/* we set the mask at the end after attaching it */
- fsnotify_init_mark(&ientry->fsn_entry, inotify_free_mark);
- ientry->wd = 0;
+ fsnotify_init_mark(&tmp_ientry->fsn_entry, inotify_free_mark);
+ tmp_ientry->wd = -1;
find_entry:
spin_lock(&inode->i_lock);
entry = fsnotify_find_mark_entry(group, inode);
spin_unlock(&inode->i_lock);
if (entry) {
- kmem_cache_free(inotify_inode_mark_cachep, ientry);
ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
} else {
- if (atomic_read(&group->inotify_data.user->inotify_watches) >= inotify_max_user_watches) {
- ret = -ENOSPC;
- goto out_err;
- }
-
- ret = fsnotify_add_mark(&ientry->fsn_entry, group, inode);
- if (ret == -EEXIST)
- goto find_entry;
- else if (ret)
+ ret = -ENOSPC;
+ if (atomic_read(&group->inotify_data.user->inotify_watches) >= inotify_max_user_watches)
goto out_err;
-
- entry = &ientry->fsn_entry;
retry:
ret = -ENOMEM;
if (unlikely(!idr_pre_get(&group->inotify_data.idr, GFP_KERNEL)))
goto out_err;
spin_lock(&group->inotify_data.idr_lock);
- ret = idr_get_new_above(&group->inotify_data.idr, entry,
- ++group->inotify_data.last_wd,
- &ientry->wd);
+ ret = idr_get_new_above(&group->inotify_data.idr, &tmp_ientry->fsn_entry,
+ group->inotify_data.last_wd,
+ &tmp_ientry->wd);
spin_unlock(&group->inotify_data.idr_lock);
if (ret) {
if (ret == -EAGAIN)
goto retry;
goto out_err;
}
+
+ ret = fsnotify_add_mark(&tmp_ientry->fsn_entry, group, inode);
+ if (ret) {
+ inotify_remove_from_idr(group, tmp_ientry);
+ if (ret == -EEXIST)
+ goto find_entry;
+ goto out_err;
+ }
+
+ /* tmp_ientry has been added to the inode, so we are all set up.
+ * now we just need to make sure tmp_ientry doesn't get freed and
+ * we need to set up entry and ientry so the generic code can
+ * do its thing. */
+ ientry = tmp_ientry;
+ entry = &ientry->fsn_entry;
+ tmp_ientry = NULL;
+
atomic_inc(&group->inotify_data.user->inotify_watches);
+ /* update the idr hint */
+ group->inotify_data.last_wd = ientry->wd;
+
/* we put the mark on the idr, take a reference */
fsnotify_get_mark(entry);
}
@@ -514,14 +532,15 @@ retry:
* depending on which path we took... */
fsnotify_put_mark(entry);
- return ret;
-
out_err:
- /* see this isn't supposed to happen, just kill the watch */
- if (entry) {
- fsnotify_destroy_mark_by_entry(entry);
- fsnotify_put_mark(entry);
+ /* could be an error, could be that we found an existing mark */
+ if (tmp_ientry) {
+ /* on the idr but didn't make it on the inode */
+ if (tmp_ientry->wd != -1)
+ inotify_remove_from_idr(group, tmp_ientry);
+ kmem_cache_free(inotify_inode_mark_cachep, tmp_ientry);
}
+
return ret;
}