The patch titled
ecryptfs: clean up (un)lock_parent
has been added to the -mm tree. Its filename is
ecryptfs-clean-up-unlock_parent.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: ecryptfs: clean up (un)lock_parent
From: Miklos Szeredi <mszeredi@xxxxxxx>
dget(dentry->d_parent) --> dget_parent(dentry)
unlock_parent() is racy and unnecessary. Replace single caller with
unlock_dir().
There are several other suspect uses of ->d_parent in ecryptfs...
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Cc: Michael Halcrow <mhalcrow@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ecryptfs/inode.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff -puN fs/ecryptfs/inode.c~ecryptfs-clean-up-unlock_parent fs/ecryptfs/inode.c
--- a/fs/ecryptfs/inode.c~ecryptfs-clean-up-unlock_parent
+++ a/fs/ecryptfs/inode.c
@@ -37,17 +37,11 @@ static struct dentry *lock_parent(struct
{
struct dentry *dir;
- dir = dget(dentry->d_parent);
+ dir = dget_parent(dentry);
mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
return dir;
}
-static void unlock_parent(struct dentry *dentry)
-{
- mutex_unlock(&(dentry->d_parent->d_inode->i_mutex));
- dput(dentry->d_parent);
-}
-
static void unlock_dir(struct dentry *dir)
{
mutex_unlock(&dir->d_inode->i_mutex);
@@ -426,8 +420,9 @@ static int ecryptfs_unlink(struct inode
int rc = 0;
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
+ struct dentry *lower_dir_dentry;
- lock_parent(lower_dentry);
+ lower_dir_dentry = lock_parent(lower_dentry);
rc = vfs_unlink(lower_dir_inode, lower_dentry);
if (rc) {
printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
@@ -439,7 +434,7 @@ static int ecryptfs_unlink(struct inode
dentry->d_inode->i_ctime = dir->i_ctime;
d_drop(dentry);
out_unlock:
- unlock_parent(lower_dentry);
+ unlock_dir(lower_dir_dentry);
return rc;
}
_
Patches currently in -mm which might be from mszeredi@xxxxxxx are
ecryptfs-clean-up-unlock_parent.patch
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