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authorChris Mason <chris.mason@oracle.com>2009-02-20 10:55:10 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-20 10:55:10 -0500
commit2cfbd50b536c878e58ab3681c4e944fa3d99b415 (patch)
treeaf29d7c8a094b0560c3ed04aebacdea23ae1177f /fs
parent2456242530a21cfee82646ebeeda65d3f74faa4c (diff)
downloadlinux-2cfbd50b536c878e58ab3681c4e944fa3d99b415.tar.bz2
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/file.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3e8023efaff7..872f104576e5 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1222,7 +1222,7 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
/*
* 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 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
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 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
* 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 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
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;
}