From e21e7095a78867364d7aa9223d833ccb966f93f3 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 1 Feb 2010 11:05:16 -0500
Subject: [PATCH] Don't mess with generic_permission() under ->d_lock in hpfs
Just use dentry_unhash() there
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/hpfs/namei.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index 15fd2c06f4a7..11c2b4080f65 100644
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -413,22 +413,25 @@ again:
mutex_unlock(&hpfs_i(dir)->i_mutex);
mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
- d_drop(dentry);
- spin_lock(&dentry->d_lock);
- if (atomic_read(&dentry->d_count) > 1 ||
- generic_permission(inode, MAY_WRITE, NULL) ||
+ dentry_unhash(dentry);
+ if (!d_unhashed(dentry)) {
+ dput(dentry);
+ unlock_kernel();
+ return -ENOSPC;
+ }
+ if (generic_permission(inode, MAY_WRITE, NULL) ||
!S_ISREG(inode->i_mode) ||
get_write_access(inode)) {
- spin_unlock(&dentry->d_lock);
d_rehash(dentry);
+ dput(dentry);
} else {
struct iattr newattrs;
- spin_unlock(&dentry->d_lock);
/*printk("HPFS: truncating file before delete.\n");*/
newattrs.ia_size = 0;
newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
err = notify_change(dentry, &newattrs);
put_write_access(inode);
+ dput(dentry);
if (!err)
goto again;
}