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This mod introduces multi-level in-core file extent functionality,
building upon the new layout introduced in mod xfs-linux:xfs-kern:207390a.

The new multi-level extent allocations are only required for heavily
fragmented files, so the old-style linear extent list is used on files
until the extents reach a pre-determined size of 4k. 4k buffers are
used because this is the system page size on Linux i386 and systems
with larger page sizes don't seem to gain much, if anything, by using
their native page size as the extent buffer size. Also, using 4k extent
buffers everywhere provides a consistent interface for CXFS across
different platforms.

The 4k extent buffers are managed by an indirection array (xfs_ext_irec_t)
which is basically just a pointer array with a bit of extra information
to keep track of the number of extents in each buffer as well as the
extent offset of each buffer.

Major changes include:

- Add multi-level in-core file extent functionality to the xfs_iext_
  subroutines introduced in mod:  xfs-linux:xfs-kern:207390a

- Introduce 13 new subroutines which add functionality for multi-level
  in-core file extents:
        xfs_iext_add_indirect_multi()
        xfs_iext_remove_indirect()
        xfs_iext_realloc_indirect()
        xfs_iext_indirect_to_direct()
        xfs_iext_bno_to_irec()
        xfs_iext_idx_to_irec()
        xfs_iext_irec_init()
        xfs_iext_irec_new()
        xfs_iext_irec_remove()
        xfs_iext_irec_compact()
        xfs_iext_irec_compact_pages()
        xfs_iext_irec_compact_full()
        xfs_iext_irec_update_extoffs()
- Export new function needed by CXFS 4.1: xfs_iext_idx_to_irec()

/*
 * 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_dir.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_dir_sf.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_dir_leaf.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_cap.h"
#include "xfs_mac.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 "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_DIR_TRACE
EXPORT_SYMBOL(xfs_dir_trace_buf);
#endif

#ifdef XFS_BUF_TRACE
extern ktrace_t *xfs_buf_trace_buf;
EXPORT_SYMBOL(xfs_buf_trace_buf);
#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_XFS_DEBUG)
extern struct list_head xfs_buftarg_list;
EXPORT_SYMBOL(xfs_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);
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_shake_deregister);
EXPORT_SYMBOL(kmem_shake_register);
EXPORT_SYMBOL(kmem_zalloc);
EXPORT_SYMBOL(kmem_zone_alloc);
EXPORT_SYMBOL(kmem_zone_free);
EXPORT_SYMBOL(kmem_zone_init);
EXPORT_SYMBOL(kmem_zone_zalloc);
EXPORT_SYMBOL(linvfs_aops);
EXPORT_SYMBOL(linvfs_dir_inode_operations);
EXPORT_SYMBOL(linvfs_dir_operations);
EXPORT_SYMBOL(linvfs_file_inode_operations);
EXPORT_SYMBOL(linvfs_file_operations);
EXPORT_SYMBOL(linvfs_invis_file_operations);
EXPORT_SYMBOL(linvfs_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);
#if ((defined(DEBUG) || defined(INDUCE_IO_ERROR)) && !defined(NO_WANT_RANDOM))
EXPORT_SYMBOL(random);
#endif
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(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_do_search_extents);
EXPORT_SYMBOL(xfs_bmap_finish);
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_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_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_xlate_dinode_core);
EXPORT_SYMBOL(xfs_xlatesb);
EXPORT_SYMBOL(xfs_zero_eof);
EXPORT_SYMBOL(xlog_recover_process_iunlinks);
EXPORT_SYMBOL(xfs_ichgtime_fast);