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restore pinning the victim dentry in vfs_rmdir()/vfs_rename_dir()

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We used to get the victim pinned by dentry_unhash() prior to commit
64252c75a2 ("vfs: remove dget() from dentry_unhash()") and ->rmdir()
and ->rename() instances relied on that; most of them don't care, but
ones that used d_delete() themselves do.  As the result, we are getting
rmdir() oopses on NFS now.

Just grab the reference before locking the victim and drop it explicitly
after unlocking, same as vfs_rename_other() does.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Simon Kirby <sim@hostway.ca>
Cc: stable@kernel.org (3.0.x)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2011-09-14 18:55:41 +01:00 committed by Linus Torvalds
parent 003f6c9df5
commit 1d2ef59014
1 changed files with 4 additions and 0 deletions
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4
fs/namei.c
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@ -2616,6 +2616,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
if (!dir->i_op->rmdir)
return -EPERM;
dget(dentry);
mutex_lock(&dentry->d_inode->i_mutex);
error = -EBUSY;
@ -2636,6 +2637,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
out:
mutex_unlock(&dentry->d_inode->i_mutex);
dput(dentry);
if (!error)
d_delete(dentry);
return error;
@ -3025,6 +3027,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
if (error)
return error;
dget(new_dentry);
if (target)
mutex_lock(&target->i_mutex);
@ -3045,6 +3048,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
out:
if (target)
mutex_unlock(&target->i_mutex);
dput(new_dentry);
if (!error)
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
d_move(old_dentry,new_dentry);