[XFS] use filldir internally

Currently xfs has a rather complicated internal scheme to allow for
different directory formats in IRIX. This patch rips all code related to
this out and pushes useage of the Linux filldir callback into the lowlevel
directory code. This does not make the code any less portable because
filldir can be used to create dirents of all possible variations
(including the IRIX ones as proved by the IRIX binary emulation code under
arch/mips/).

This patch get rid of an unessecary copy in the readdir path, about 400
lines of code and one of the last two users of the uio structure.

This version is updated to deal with dmapi aswell which greatly simplifies
the get_dirattrs code. The dmapi part has been tested using the
get_dirattrs tools from the xfstest dmapi suite1 with various small and
large directories.

SGI-PV: 968563
SGI-Modid: xfs-linux-melb:xfs-kern:29478a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 0 insertions, 31 deletions

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 0116ce1ad59e..36318c66a7bf 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -3284,37 +3284,6 @@ xfs_rmdir(
         goto std_return;
 }
 
-
-/*
- * Read dp's entries starting at uiop->uio_offset and translate them into
- * bufsize bytes worth of struct dirents starting at bufbase.
- */
-STATIC int
-xfs_readdir(
-        bhv_desc_t      *dir_bdp,
-        uio_t           *uiop,
-        cred_t          *credp,
-        int             *eofp)
-{
-        xfs_inode_t     *dp;
-        xfs_trans_t     *tp = NULL;
-        int             error = 0;
-        uint            lock_mode;
-
-        vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__,
-                                               (inst_t *)__return_address);
-        dp = XFS_BHVTOI(dir_bdp);
-
-        if (XFS_FORCED_SHUTDOWN(dp->i_mount))
-                return XFS_ERROR(EIO);
-
-        lock_mode = xfs_ilock_map_shared(dp);
-        error = xfs_dir_getdents(tp, dp, uiop, eofp);
-        xfs_iunlock_map_shared(dp, lock_mode);
-        return error;
-}
-
-
 STATIC int
 xfs_symlink(
         bhv_desc_t              *dir_bdp,