/*

   * Copyright (c) 2000,2005 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_shared.h"

  #include "xfs_format.h"

  #include "xfs_log_format.h"
  #include "xfs_trans_resv.h"

  #include "xfs_mount.h"

  #include "xfs_inode.h"

  #include "xfs_trans.h"

  #include "xfs_trans_priv.h"
  #include "xfs_inode_item.h"

  #include "xfs_trace.h"

  /*

   * Add a locked inode to the transaction.
   *
   * The inode must be locked, and it cannot be associated with any transaction.

   * If lock_flags is non-zero the inode will be unlocked on transaction commit.

   */
  void
  xfs_trans_ijoin(

  	struct xfs_trans	*tp,

  	struct xfs_inode	*ip,
  	uint			lock_flags)

  {
  	xfs_inode_log_item_t	*iip;

  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

  	if (ip->i_itemp == NULL)
  		xfs_inode_item_init(ip, ip->i_mount);
  	iip = ip->i_itemp;

  	ASSERT(iip->ili_lock_flags == 0);

  	iip->ili_lock_flags = lock_flags;

  
  	/*
  	 * Get a log_item_desc to point at the new item.
  	 */

  	xfs_trans_add_item(tp, &iip->ili_item);

  }

  /*

   * Transactional inode timestamp update. Requires the inode to be locked and
   * joined to the transaction supplied. Relies on the transaction subsystem to
   * track dirty state and update/writeback the inode accordingly.
   */
  void
  xfs_trans_ichgtime(
  	struct xfs_trans	*tp,
  	struct xfs_inode	*ip,
  	int			flags)
  {
  	struct inode		*inode = VFS_I(ip);

  	struct timespec		tv;

  
  	ASSERT(tp);
  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

  	tv = current_time(inode);

  	if (flags & XFS_ICHGTIME_MOD)

  		inode->i_mtime = tv;

  	if (flags & XFS_ICHGTIME_CHG)

  		inode->i_ctime = tv;

  }
  
  /*

   * This is called to mark the fields indicated in fieldmask as needing
   * to be logged when the transaction is committed.  The inode must
   * already be associated with the given transaction.
   *
   * The values for fieldmask are defined in xfs_inode_item.h.  We always
   * log all of the core inode if any of it has changed, and we always log
   * all of the inline data/extents/b-tree root if any of them has changed.
   */
  void
  xfs_trans_log_inode(
  	xfs_trans_t	*tp,
  	xfs_inode_t	*ip,
  	uint		flags)
  {

  	ASSERT(ip->i_itemp != NULL);

  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

  	/*

  	 * Record the specific change for fdatasync optimisation. This
  	 * allows fdatasync to skip log forces for inodes that are only
  	 * timestamp dirty. We do this before the change count so that
  	 * the core being logged in this case does not impact on fdatasync
  	 * behaviour.
  	 */
  	ip->i_itemp->ili_fsync_fields |= flags;
  
  	/*

  	 * First time we log the inode in a transaction, bump the inode change

  	 * counter if it is configured for this to occur. We don't use
  	 * inode_inc_version() because there is no need for extra locking around
  	 * i_version as we already hold the inode locked exclusively for
  	 * metadata modification.

  	 */
  	if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
  	    IS_I_VERSION(VFS_I(ip))) {

  		VFS_I(ip)->i_version++;

  		flags |= XFS_ILOG_CORE;
  	}

  	tp->t_flags |= XFS_TRANS_DIRTY;

  	ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;

  
  	/*
  	 * Always OR in the bits from the ili_last_fields field.
  	 * This is to coordinate with the xfs_iflush() and xfs_iflush_done()

  	 * routines in the eventual clearing of the ili_fields bits.

  	 * See the big comment in xfs_iflush() for an explanation of

  	 * this coordination mechanism.

  	 */
  	flags |= ip->i_itemp->ili_last_fields;

  	ip->i_itemp->ili_fields |= flags;

  }