diff options
| author | Josef Bacik <josef@redhat.com> | 2010-11-20 09:48:00 +0000 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-11-21 22:26:09 -0500 |
| commit | 6a912213046ecb6511fdf35531a0c7de3de963c9 (patch) | |
| tree | b745a07d0ad5c5bedf68c55739200093f9d96c1b /fs/btrfs/inode.c | |
| parent | 76195853903ca613ba722203db9b747d70478fc7 (diff) | |
| download | lwn-6a912213046ecb6511fdf35531a0c7de3de963c9.tar.gz lwn-6a912213046ecb6511fdf35531a0c7de3de963c9.zip | |
Btrfs: use dget_parent where we can UPDATED
There are lots of places where we do dentry->d_parent->d_inode without holding
the dentry->d_lock. This could cause problems with rename. So instead we need
to use dget_parent() and hold the reference to the parent as long as we are
going to use it's inode and then dput it at the end.
Signed-off-by: Josef Bacik <josef@redhat.com>
Cc: raven@themaw.net
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index fc22f556aa24..c0faf47d0cd9 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4811,10 +4811,12 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, if (err) { drop_inode = 1; } else { + struct dentry *parent = dget_parent(dentry); btrfs_update_inode_block_group(trans, dir); err = btrfs_update_inode(trans, root, inode); BUG_ON(err); - btrfs_log_new_name(trans, inode, NULL, dentry->d_parent); + btrfs_log_new_name(trans, inode, NULL, parent); + dput(parent); } nr = trans->blocks_used; @@ -6768,8 +6770,9 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, BUG_ON(ret); if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { - btrfs_log_new_name(trans, old_inode, old_dir, - new_dentry->d_parent); + struct dentry *parent = dget_parent(new_dentry); + btrfs_log_new_name(trans, old_inode, old_dir, parent); + dput(parent); btrfs_end_log_trans(root); } out_fail: |