Commit 495e8677 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
Browse files

Btrfs: hold i_mutex when calling btrfs_log_dentry_safe



Since we walk up the path logging all of the parts of the inode's path, we need
to hold i_mutex to make sure that the inode is not renamed while we're logging
everything.  btrfs_log_dentry_safe does dget_parent and all of that jazz, but we
may get unexpected results if the rename changes the inode's location while
we're higher up the path logging those dentries, so do this for safety reasons.
Thanks,
Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 6a912213
......@@ -1047,8 +1047,14 @@ out:
if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
num_written = PTR_ERR(trans);
goto done;
}
mutex_lock(&inode->i_mutex);
ret = btrfs_log_dentry_safe(trans, root,
file->f_dentry);
mutex_unlock(&inode->i_mutex);
if (ret == 0) {
ret = btrfs_sync_log(trans, root);
if (ret == 0)
......@@ -1067,6 +1073,7 @@ out:
(start_pos + num_written - 1) >> PAGE_CACHE_SHIFT);
}
}
done:
current->backing_dev_info = NULL;
return num_written ? num_written : err;
}
......
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