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Btrfs: check file pointer in btrfs_sync_file

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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>
This commit is contained in:
Chris Mason 2009-02-20 10:55:10 -05:00
parent 2456242530
commit 2cfbd50b53
1 changed files with 4 additions and 4 deletions
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8
fs/btrfs/file.c
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@ -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;
}