From f6aa7f2184330262e1cb5f7802536e5346bd46a3 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 5 Feb 2008 12:13:15 +1100 Subject: [XFS] stop re-checking permissions in xfs_swapext xfs_swapext should simplify check if we have a writeable file descriptor instead of re-checking the permissions using xfs_iaccess. Add an additional check to refuse O_APPEND file descriptors because swapext is not an append-only write operation. SGI-PV: 971186 SGI-Modid: xfs-linux-melb:xfs-kern:30369a Signed-off-by: Christoph Hellwig Signed-off-by: Lachlan McIlroy --- fs/xfs/xfs_dfrag.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'fs/xfs') diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c index 5d3285952ff7..3f53fad356a3 100644 --- a/fs/xfs/xfs_dfrag.c +++ b/fs/xfs/xfs_dfrag.c @@ -74,12 +74,23 @@ xfs_swapext( goto out_free_sxp; } + if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) { + error = XFS_ERROR(EBADF); + goto out_put_file; + } + target_file = fget((int)sxp->sx_fdtmp); if (!target_file) { error = XFS_ERROR(EINVAL); goto out_put_file; } + if (!(target_file->f_mode & FMODE_WRITE) || + (target_file->f_flags & O_APPEND)) { + error = XFS_ERROR(EBADF); + goto out_put_target_file; + } + ip = XFS_I(file->f_path.dentry->d_inode); tip = XFS_I(target_file->f_path.dentry->d_inode); @@ -154,15 +165,6 @@ xfs_swap_extents( xfs_lock_inodes(ips, 2, 0, lock_flags); locked = 1; - /* Check permissions */ - error = xfs_iaccess(ip, S_IWUSR, NULL); - if (error) - goto error0; - - error = xfs_iaccess(tip, S_IWUSR, NULL); - if (error) - goto error0; - /* Verify that both files have the same format */ if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) { error = XFS_ERROR(EINVAL); -- cgit v1.2.3-59-g8ed1b