Btrfs: check file pointer in btrfs_sync_file
fsync can be called by NFS with a null file pointer, and btrfs was
oopsing in this case.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3e8023e..872f104 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1222,7 +1222,7 @@
/*
* ok we haven't committed the transaction yet, lets do a commit
*/
- if (file->private_data)
+ if (file && file->private_data)
btrfs_ioctl_trans_end(file);
trans = btrfs_start_transaction(root, 1);
@@ -1231,7 +1231,7 @@
goto out;
}
- ret = btrfs_log_dentry_safe(trans, root, file->f_dentry);
+ ret = btrfs_log_dentry_safe(trans, root, dentry);
if (ret < 0)
goto out;
@@ -1245,7 +1245,7 @@
* file again, but that will end up using the synchronization
* inside btrfs_sync_log to keep things safe.
*/
- mutex_unlock(&file->f_dentry->d_inode->i_mutex);
+ mutex_unlock(&dentry->d_inode->i_mutex);
if (ret > 0) {
ret = btrfs_commit_transaction(trans, root);
@@ -1253,7 +1253,7 @@
btrfs_sync_log(trans, root);
ret = btrfs_end_transaction(trans, root);
}
- mutex_lock(&file->f_dentry->d_inode->i_mutex);
+ mutex_lock(&dentry->d_inode->i_mutex);
out:
return ret > 0 ? EIO : ret;
}