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write barrier support

Issue all log sync operations as ordered writes.  In addition flush the
disk cache on fsync if the sync cached operation didn't sync the log to
disk (this requires some additional bookeping in the transaction and log
code).
If the device doesn't claim to support barriers, the filesystem has an
extern log volume or the trial superblock write with barriers enabled
failed we disable barriers and print a warning.  We should probably fail
the mount completely, but that could lead to nasty boot failures for
the root filesystem.

Not enabled by default yet, needs more destructive testing first.

/*
 * 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 version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include "xfs.h"

#include "xfs_fs.h"
#include "xfs_buf.h"
#include "xfs_macros.h"
#include "xfs_inum.h"
#include "xfs_log.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_imap.h"
#include "xfs_alloc.h"
#include "xfs_dmapi.h"
#include "xfs_quota.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_bit.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_itable.h"
#include "xfs_rw.h"
#include "xfs_refcache.h"
#include "xfs_da_btree.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 PAGEBUF_TRACE
extern ktrace_t *pagebuf_trace_buf;
EXPORT_SYMBOL(pagebuf_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);
#if __BYTE_ORDER != __BIG_ENDIAN
EXPORT_SYMBOL(xfs_bmbt_disk_get_all);
#endif

#if defined(CONFIG_XFS_DEBUG)
extern struct list_head pbd_delwrite_queue;
EXPORT_SYMBOL(pbd_delwrite_queue);

EXPORT_SYMBOL(xfs_fileoff_max);
EXPORT_SYMBOL(xfs_bhvtom);
EXPORT_SYMBOL(xfs_fsb_to_agno);
EXPORT_SYMBOL(xfs_fsb_to_agbno);
EXPORT_SYMBOL(xfs_dir2_data_unused_tag_p);
EXPORT_SYMBOL(xfs_attr_leaf_name_remote);
EXPORT_SYMBOL(xfs_lic_slot);
EXPORT_SYMBOL(xfs_dir2_sf_firstentry);
EXPORT_SYMBOL(xfs_ino_to_agno);
EXPORT_SYMBOL(xfs_dir2_sf_get_inumber);
EXPORT_SYMBOL(xfs_dir2_data_entry_tag_p);
EXPORT_SYMBOL(xfs_dir2_sf_inumberp);
EXPORT_SYMBOL(xfs_dir2_data_entsize);
EXPORT_SYMBOL(xfs_lic_isfree);
EXPORT_SYMBOL(xfs_attr_leaf_name_local);
EXPORT_SYMBOL(xfs_bmap_broot_ptr_addr);
EXPORT_SYMBOL(xfs_dir_sf_get_dirino);
EXPORT_SYMBOL(xfs_ino_to_agbno);
EXPORT_SYMBOL(xfs_dir2_leaf_bests_p);
EXPORT_SYMBOL(xfs_dir2_sf_get_offset);
EXPORT_SYMBOL(startblockval);
EXPORT_SYMBOL(xfs_attr_sf_nextentry);
EXPORT_SYMBOL(xfs_bmap_broot_key_addr);
EXPORT_SYMBOL(xfs_dir2_block_leaf_p);
EXPORT_SYMBOL(xfs_dir_leaf_namestruct);
EXPORT_SYMBOL(xfs_ino_to_offset);
EXPORT_SYMBOL(isnullstartblock);
EXPORT_SYMBOL(xfs_lic_are_all_free);
EXPORT_SYMBOL(xfs_dir_sf_nextentry);
EXPORT_SYMBOL(xfs_dir2_sf_nextentry);

EXPORT_SYMBOL(xfs_da_cookie_entry);
EXPORT_SYMBOL(xfs_da_cookie_bno);
EXPORT_SYMBOL(xfs_da_cookie_hash);
#endif
EXPORT_SYMBOL(xfs_xlate_dinode_core);
EXPORT_SYMBOL(xfs_xlatesb);


/*
 * 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);
#if ((defined(DEBUG) || defined(INDUCE_IO_ERROR)) && !defined(NO_WANT_RANDOM))
EXPORT_SYMBOL(get_thread_id);
#endif
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(pagebuf_delwri_dequeue);
EXPORT_SYMBOL(_pagebuf_find);
EXPORT_SYMBOL(pagebuf_iostart);
EXPORT_SYMBOL(pagebuf_ispin);
#ifdef DEBUG
EXPORT_SYMBOL(pagebuf_lock_value);
#endif
EXPORT_SYMBOL(pagebuf_offset);
EXPORT_SYMBOL(pagebuf_rele);
EXPORT_SYMBOL(pagebuf_readahead);
EXPORT_SYMBOL(pagebuf_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_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_freesb);
EXPORT_SYMBOL(xfs_fs_cmn_err);
EXPORT_SYMBOL(xfs_highbit32);
EXPORT_SYMBOL(xfs_highbit64);
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IALLOC_BLOCKS)
EXPORT_SYMBOL(xfs_ialloc_blocks);
#endif
EXPORT_SYMBOL(xfs_idestroy);
EXPORT_SYMBOL(xfs_iextract);
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_setsize_buftarg);
EXPORT_SYMBOL(xfs_syncsub);
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_write_clear_setuid);
EXPORT_SYMBOL(xfs_zero_eof);
EXPORT_SYMBOL(xlog_recover_process_iunlinks);


#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_BHVTOI)
EXPORT_SYMBOL(xfs_bhvtoi);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_VFSTOM)
EXPORT_SYMBOL(xfs_vfstom);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_BM_MAXLEVELS)
EXPORT_SYMBOL(xfs_bm_maxlevels);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_BMAP_INIT)
EXPORT_SYMBOL(xfs_bmap_init);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_FILBLKS_MIN)
EXPORT_SYMBOL(xfs_filblks_min);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_FSB_TO_DADDR)
EXPORT_SYMBOL(xfs_fsb_to_daddr);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_IFORK_PTR)
EXPORT_SYMBOL(xfs_ifork_ptr);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_IFORK_Q)
EXPORT_SYMBOL(xfs_ifork_q);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_IN_MAXLEVELS)
EXPORT_SYMBOL(xfs_in_maxlevels);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_ITOBHV)
EXPORT_SYMBOL(xfs_itobhv);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_ITOV)
EXPORT_SYMBOL(xfs_itov);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_MTOVFS)
EXPORT_SYMBOL(xfs_mtovfs);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_SB_VERSION_ADDQUOTA)
EXPORT_SYMBOL(xfs_sb_version_addquota);
#endif
#if XFS_WANT_FUNCS_C || (XFS_WANT_SPACE_C && XFSSO_XFS_SB_VERSION_HASQUOTA)
EXPORT_SYMBOL(xfs_sb_version_hasquota);
#endif