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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.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:29478a by kenmcd.

  Use the generic filldir directory formatter callbacks rather than
  the complex xfs_uio_move based implementation. Removes a copy
  and simplifies the code greatly.

/*
 * Copyright (c) 2004-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_buf.h"
#include "xfs_log.h"
#include "xfs_imap.h"
#include "xfs_inum.h"
#include "xfs_clnt.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_refcache.h"
#include "xfs_dir2_data.h"
#include "xfs_dir2_leaf.h"
#include "xfs_dir2_block.h"
#include "xfs_dir2_node.h"
#include "xfs_dir2_trace.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_inode_item.h"
#include "xfs_buf_item.h"
#include "xfs_extfree_item.h"
#include "xfs_log_priv.h"
#include "xfs_trans_priv.h"
#include "xfs_trans_space.h"
#include "xfs_utils.h"
#include "xfs_iomap.h"
#include "xfs_filestream.h"
#include "support/ktrace.h"


/*
 * Export symbols used for XFS tracing
 */

#if defined(CONFIG_XFS_TRACE)
EXPORT_SYMBOL(ktrace_enter);
EXPORT_SYMBOL(ktrace_free);
EXPORT_SYMBOL(ktrace_alloc);
EXPORT_SYMBOL(ktrace_skip);
EXPORT_SYMBOL(ktrace_nentries);
EXPORT_SYMBOL(ktrace_first);
EXPORT_SYMBOL(ktrace_next);
#endif

#ifdef XFS_VNODE_TRACE
EXPORT_SYMBOL(vn_trace_ref);
EXPORT_SYMBOL(vn_trace_entry);
EXPORT_SYMBOL(vn_trace_exit);
EXPORT_SYMBOL(vn_trace_hold);
EXPORT_SYMBOL(vn_trace_rele);
#endif

#ifdef XFS_ILOCK_TRACE
EXPORT_SYMBOL(xfs_ilock_trace_buf);
#endif
#ifdef XFS_ALLOC_TRACE
EXPORT_SYMBOL(xfs_alloc_trace_buf);
#endif
#ifdef XFS_BMAP_TRACE
EXPORT_SYMBOL(xfs_bmap_trace_buf);
#endif
#ifdef XFS_BMBT_TRACE
EXPORT_SYMBOL(xfs_bmbt_trace_buf);
#endif
#ifdef XFS_ATTR_TRACE
EXPORT_SYMBOL(xfs_attr_trace_buf);
#endif
#ifdef XFS_DIR2_TRACE
EXPORT_SYMBOL(xfs_dir2_trace_buf);
#endif
#ifdef XFS_FILESTREAMS_TRACE
EXPORT_SYMBOL(xfs_filestreams_trace_buf);
#endif

#ifdef XFS_BUF_TRACE
extern ktrace_t *xfs_buf_trace_buf;
EXPORT_SYMBOL(xfs_buf_trace_buf);
EXPORT_SYMBOL(xfs_buf_trace);
#endif


/*
 * Export symbols used for XFS debugging
 */
EXPORT_SYMBOL(xfs_next_bit);
EXPORT_SYMBOL(xfs_contig_bits);
EXPORT_SYMBOL(xfs_bmbt_get_all);
EXPORT_SYMBOL(xfs_params);
#ifndef XFS_NATIVE_HOST
EXPORT_SYMBOL(xfs_bmbt_disk_get_all);
#endif

#if defined(CONFIG_KDB_MODULES)
EXPORT_SYMBOL(xfs_get_buftarg_list);
#endif

/*
 * Export symbols used by XFS behavior modules.
 */

EXPORT_SYMBOL(assfail);
EXPORT_SYMBOL(cmn_err);
EXPORT_SYMBOL(bhv_base);
EXPORT_SYMBOL(bhv_get_vfsops);
EXPORT_SYMBOL(bhv_head_destroy);
EXPORT_SYMBOL(bhv_insert);
EXPORT_SYMBOL(bhv_insert_initial);
EXPORT_SYMBOL(bhv_lookup_range);
EXPORT_SYMBOL(bhv_module_init);
EXPORT_SYMBOL(bhv_module_exit);
EXPORT_SYMBOL(bhv_remove_vfsops);
EXPORT_SYMBOL(bhv_remove_all_vfsops);
EXPORT_SYMBOL(bhv_remove_not_first);
EXPORT_SYMBOL(fs_flush_pages);
EXPORT_SYMBOL(fs_flushinval_pages);
EXPORT_SYMBOL(fs_tosspages);
EXPORT_SYMBOL(fs_noval);
EXPORT_SYMBOL(icmn_err);
EXPORT_SYMBOL(kmem_alloc);
EXPORT_SYMBOL(kmem_free);
EXPORT_SYMBOL(kmem_realloc);
EXPORT_SYMBOL(kmem_zalloc);
EXPORT_SYMBOL(kmem_zone_alloc);
EXPORT_SYMBOL(kmem_zalloc_greedy);
EXPORT_SYMBOL(kmem_zone_free);
EXPORT_SYMBOL(kmem_zone_init);
EXPORT_SYMBOL(kmem_zone_zalloc);
EXPORT_SYMBOL(xfs_address_space_operations);
EXPORT_SYMBOL(xfs_dir_inode_operations);
EXPORT_SYMBOL(xfs_dir_file_operations);
EXPORT_SYMBOL(xfs_inode_operations);
EXPORT_SYMBOL(xfs_file_operations);
EXPORT_SYMBOL(xfs_invis_file_operations);
EXPORT_SYMBOL(xfs_symlink_inode_operations);
EXPORT_SYMBOL(xfs_buf_delwri_dequeue);
EXPORT_SYMBOL(_xfs_buf_find);
EXPORT_SYMBOL(xfs_buf_iostart);
EXPORT_SYMBOL(xfs_buf_ispin);
#ifdef DEBUG
EXPORT_SYMBOL(xfs_buf_lock_value);
#endif
EXPORT_SYMBOL(xfs_buf_offset);
EXPORT_SYMBOL(xfs_buf_rele);
EXPORT_SYMBOL(xfs_buf_readahead);
EXPORT_SYMBOL(xfs_buf_unlock);
EXPORT_SYMBOL(sys_cred);
EXPORT_SYMBOL(uuid_create_nil);
EXPORT_SYMBOL(uuid_equal);
EXPORT_SYMBOL(uuid_getnodeuniq);
EXPORT_SYMBOL(uuid_hash64);
EXPORT_SYMBOL(uuid_is_nil);
EXPORT_SYMBOL(uuid_table_remove);
EXPORT_SYMBOL(vfs_mount);
EXPORT_SYMBOL(vfs_parseargs);
EXPORT_SYMBOL(vfs_showargs);
EXPORT_SYMBOL(vfs_unmount);
EXPORT_SYMBOL(vfs_mntupdate);
EXPORT_SYMBOL(vfs_root);
EXPORT_SYMBOL(vfs_statvfs);
EXPORT_SYMBOL(vfs_sync);
EXPORT_SYMBOL(vfs_vget);
EXPORT_SYMBOL(vfs_dmapiops);
EXPORT_SYMBOL(vfs_quotactl);
EXPORT_SYMBOL(vfs_get_inode);
EXPORT_SYMBOL(vfs_init_vnode);
EXPORT_SYMBOL(vfs_force_shutdown);
EXPORT_SYMBOL(vfs_from_sb);
EXPORT_SYMBOL(vn_hold);
EXPORT_SYMBOL(vn_initialize);
EXPORT_SYMBOL(vn_revalidate);
EXPORT_SYMBOL(vn_revalidate_core);

#if defined(CONFIG_XFS_POSIX_ACL)
EXPORT_SYMBOL(xfs_acl_vtoacl);
EXPORT_SYMBOL(xfs_acl_inherit);
#endif
EXPORT_SYMBOL(xfs_alloc_buftarg);
EXPORT_SYMBOL(xfs_flush_buftarg);
EXPORT_SYMBOL(xfs_free_buftarg);
EXPORT_SYMBOL(xfs_bdstrat_cb);
EXPORT_SYMBOL(xfs_bmap_cancel);
EXPORT_SYMBOL(xfs_bmap_count_blocks);
EXPORT_SYMBOL(xfs_bmap_finish);
EXPORT_SYMBOL(xfs_bmap_search_multi_extents);
EXPORT_SYMBOL(xfs_bmapi);
EXPORT_SYMBOL(xfs_bmapi_single);
EXPORT_SYMBOL(xfs_bmbt_get_blockcount);
EXPORT_SYMBOL(xfs_bmbt_get_state);
EXPORT_SYMBOL(xfs_bmbt_get_startoff);
EXPORT_SYMBOL(xfs_bmbt_set_all);
EXPORT_SYMBOL(xfs_bmbt_set_allf);
EXPORT_SYMBOL(xfs_bmbt_set_blockcount);
EXPORT_SYMBOL(xfs_bmbt_set_startblock);
EXPORT_SYMBOL(xfs_bmbt_set_startoff);
EXPORT_SYMBOL(xfs_bmbt_set_state);
EXPORT_SYMBOL(xfs_buf_attach_iodone);
EXPORT_SYMBOL(xfs_bulkstat);
EXPORT_SYMBOL(xfs_bunmapi);
EXPORT_SYMBOL(xfs_bwrite);
EXPORT_SYMBOL(xfs_change_file_space);
EXPORT_SYMBOL(xfs_chashlist_zone);
EXPORT_SYMBOL(xfs_dev_is_read_only);
EXPORT_SYMBOL(xfs_dir_ialloc);
EXPORT_SYMBOL(xfs_error_report);
#ifdef DEBUG
EXPORT_SYMBOL(xfs_error_trap);
#endif
EXPORT_SYMBOL(xfs_file_last_byte);
EXPORT_SYMBOL(xfs_finish_reclaim_all);
EXPORT_SYMBOL(xfs_freesb);
EXPORT_SYMBOL(xfs_fs_cmn_err);
EXPORT_SYMBOL(xfs_highbit32);
EXPORT_SYMBOL(xfs_highbit64);
EXPORT_SYMBOL(xfs_idestroy);
EXPORT_SYMBOL(xfs_iaccess);
EXPORT_SYMBOL(xfs_iextract);
EXPORT_SYMBOL(xfs_iext_add);
EXPORT_SYMBOL(xfs_iext_destroy);
EXPORT_SYMBOL(xfs_iext_get_ext);
EXPORT_SYMBOL(xfs_iext_idx_to_irec);
EXPORT_SYMBOL(xfs_iext_insert);
EXPORT_SYMBOL(xfs_iext_remove);
EXPORT_SYMBOL(xfs_iflock);
EXPORT_SYMBOL(xfs_iflock_nowait);
EXPORT_SYMBOL(xfs_iflush);
EXPORT_SYMBOL(xfs_ifunlock);
EXPORT_SYMBOL(xfs_iget);
EXPORT_SYMBOL(xfs_igrow_start);
EXPORT_SYMBOL(xfs_igrow_finish);
EXPORT_SYMBOL(xfs_ilock);
EXPORT_SYMBOL(xfs_ilock_map_shared);
EXPORT_SYMBOL(xfs_ilock_nowait);
EXPORT_SYMBOL(xfs_inode_lock_init);
EXPORT_SYMBOL(xfs_internal_inum);
EXPORT_SYMBOL(xfs_iocore_inode_init);
EXPORT_SYMBOL(xfs_iocore_xfs);
EXPORT_SYMBOL(xfs_iomap);
EXPORT_SYMBOL(xfs_iput);
EXPORT_SYMBOL(xfs_iput_new);
EXPORT_SYMBOL(xfs_iread);
EXPORT_SYMBOL(xfs_iread_extents);
EXPORT_SYMBOL(xfs_itruncate_start);
EXPORT_SYMBOL(xfs_iunlock);
EXPORT_SYMBOL(xfs_iunlock_map_shared);
EXPORT_SYMBOL(xfs_itruncate_finish);
EXPORT_SYMBOL(_xfs_log_force);
EXPORT_SYMBOL(xfs_log_force_umount);
EXPORT_SYMBOL(xfs_log_unmount_dealloc);
EXPORT_SYMBOL(xfs_log_unmount_write);
EXPORT_SYMBOL(xfs_mod_sb);
EXPORT_SYMBOL(xfs_mount_free);
EXPORT_SYMBOL(xfs_mount_init);
EXPORT_SYMBOL(xfs_mount_reset_sbqflags);
EXPORT_SYMBOL(xfs_mountfs);
EXPORT_SYMBOL(xfs_qm_dqcheck);
EXPORT_SYMBOL(xfs_readsb);
EXPORT_SYMBOL(xfs_read_buf);
EXPORT_SYMBOL(xfs_rwlock);
EXPORT_SYMBOL(xfs_rwunlock);
EXPORT_SYMBOL(xfs_setattr);
EXPORT_SYMBOL(xfs_setsize_buftarg);
EXPORT_SYMBOL(xfs_syncsub);
EXPORT_SYMBOL(xfs_sync_inodes);
EXPORT_SYMBOL(xfs_trans_add_item);
EXPORT_SYMBOL(xfs_trans_alloc);
EXPORT_SYMBOL(xfs_trans_bhold);
EXPORT_SYMBOL(xfs_trans_bhold_release);
EXPORT_SYMBOL(xfs_trans_bjoin);
EXPORT_SYMBOL(xfs_trans_brelse);
EXPORT_SYMBOL(xfs_trans_cancel);
EXPORT_SYMBOL(_xfs_trans_commit);
EXPORT_SYMBOL(xfs_trans_delete_ail);
EXPORT_SYMBOL(xfs_trans_dquot_buf);
EXPORT_SYMBOL(xfs_trans_find_item);
EXPORT_SYMBOL(xfs_trans_get_buf);
EXPORT_SYMBOL(xfs_trans_iget);
EXPORT_SYMBOL(xfs_trans_ihold);
EXPORT_SYMBOL(xfs_trans_ijoin);
EXPORT_SYMBOL(xfs_trans_log_buf);
EXPORT_SYMBOL(xfs_trans_log_inode);
EXPORT_SYMBOL(xfs_trans_mod_sb);
EXPORT_SYMBOL(xfs_trans_read_buf);
EXPORT_SYMBOL(xfs_trans_reserve);
EXPORT_SYMBOL(xfs_trans_unlocked_item);
EXPORT_SYMBOL(xfs_truncate_file);
EXPORT_SYMBOL(xfs_unmount_flush);
EXPORT_SYMBOL(xfs_unmountfs_writesb);
EXPORT_SYMBOL(xfs_vfsops);
EXPORT_SYMBOL(xfs_vnodeops);
EXPORT_SYMBOL(xfs_vtoi);
EXPORT_SYMBOL(xfs_write_clear_setuid);
EXPORT_SYMBOL(xfs_dinode_from_disk);
EXPORT_SYMBOL(xfs_sb_from_disk);
EXPORT_SYMBOL(xfs_zero_eof);
EXPORT_SYMBOL(xlog_recover_process_iunlinks);
EXPORT_SYMBOL(xfs_ichgtime_fast);
EXPORT_SYMBOL(xfs_free_eofblocks);