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authorChristoph Hellwig <hch@infradead.org>2008-02-05 12:13:15 +1100
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-02-07 18:22:24 +1100
commitf6aa7f2184330262e1cb5f7802536e5346bd46a3 (patch)
tree73edcd57933b033bf69e6ae5cf46e102b47b41cb /fs/xfs/xfs_dfrag.c
parent35fec8df65217546f6d9d508b203c1d135a67fbc (diff)
downloadlinux-f6aa7f2184330262e1cb5f7802536e5346bd46a3.tar.bz2
[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 <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_dfrag.c')
-rw-r--r--fs/xfs/xfs_dfrag.c20
1 files changed, 11 insertions, 9 deletions
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);