3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Niels de Vos <ndevos@xxxxxxxxxx>
commit 53ce9a3364de0723b27d861de93bfc882f7db050 upstream.
In case d_lookup() returns a dentry with d_inode == NULL, the dentry is not
returned with dput(). This results in triggering a BUG() in
shrink_dcache_for_umount_subtree():
BUG: Dentry ...{i=0,n=...} still in use (1) [unmount of fuse fuse]
[SzM: need to d_drop() as well]
Reported-by: Justin Clift <jclift@xxxxxxxxxx>
Signed-off-by: Niels de Vos <ndevos@xxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Tested-by: Brian Foster <bfoster@xxxxxxxxxx>
Tested-by: Niels de Vos <ndevos@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fuse/dir.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1229,9 +1229,15 @@ static int fuse_direntplus_link(struct f
name.hash = full_name_hash(name.name, name.len);
dentry = d_lookup(parent, &name);
- if (dentry && dentry->d_inode) {
+ if (dentry) {
inode = dentry->d_inode;
- if (get_node_id(inode) == o->nodeid) {
+ if (!inode) {
+ d_drop(dentry);
+ } else if (get_node_id(inode) != o->nodeid) {
+ err = d_invalidate(dentry);
+ if (err)
+ goto out;
+ } else {
struct fuse_inode *fi;
fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
@@ -1244,9 +1250,6 @@ static int fuse_direntplus_link(struct f
*/
goto found;
}
- err = d_invalidate(dentry);
- if (err)
- goto out;
dput(dentry);
dentry = NULL;
}
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