LXR linux/fs/xfs/xfs_trans

   1/*
   2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#include "xfs.h"
  19#include "xfs_fs.h"
  20#include "xfs_shared.h"
  21#include "xfs_format.h"
  22#include "xfs_log_format.h"
  23#include "xfs_trans_resv.h"
  24#include "xfs_sb.h"
  25#include "xfs_ag.h"
  26#include "xfs_mount.h"
  27#include "xfs_inode.h"
  28#include "xfs_trans.h"
  29#include "xfs_trans_priv.h"
  30#include "xfs_inode_item.h"
  31#include "xfs_trace.h"
  32
  33/*
  34 * Add a locked inode to the transaction.
  35 *
  36 * The inode must be locked, and it cannot be associated with any transaction.
  37 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
  38 */
  39void
  40xfs_trans_ijoin(
  41        struct xfs_trans        *tp,
  42        struct xfs_inode        *ip,
  43        uint                    lock_flags)
  44{
  45        xfs_inode_log_item_t    *iip;
  46
  47        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  48        if (ip->i_itemp == NULL)
  49                xfs_inode_item_init(ip, ip->i_mount);
  50        iip = ip->i_itemp;
  51
  52        ASSERT(iip->ili_lock_flags == 0);
  53        iip->ili_lock_flags = lock_flags;
  54
  55        /*
  56         * Get a log_item_desc to point at the new item.
  57         */
  58        xfs_trans_add_item(tp, &iip->ili_item);
  59}
  60
  61/*
  62 * Transactional inode timestamp update. Requires the inode to be locked and
  63 * joined to the transaction supplied. Relies on the transaction subsystem to
  64 * track dirty state and update/writeback the inode accordingly.
  65 */
  66void
  67xfs_trans_ichgtime(
  68        struct xfs_trans        *tp,
  69        struct xfs_inode        *ip,
  70        int                     flags)
  71{
  72        struct inode            *inode = VFS_I(ip);
  73        timespec_t              tv;
  74
  75        ASSERT(tp);
  76        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  77
  78        tv = current_fs_time(inode->i_sb);
  79
  80        if ((flags & XFS_ICHGTIME_MOD) &&
  81            !timespec_equal(&inode->i_mtime, &tv)) {
  82                inode->i_mtime = tv;
  83                ip->i_d.di_mtime.t_sec = tv.tv_sec;
  84                ip->i_d.di_mtime.t_nsec = tv.tv_nsec;
  85        }
  86        if ((flags & XFS_ICHGTIME_CHG) &&
  87            !timespec_equal(&inode->i_ctime, &tv)) {
  88                inode->i_ctime = tv;
  89                ip->i_d.di_ctime.t_sec = tv.tv_sec;
  90                ip->i_d.di_ctime.t_nsec = tv.tv_nsec;
  91        }
  92}
  93
  94/*
  95 * This is called to mark the fields indicated in fieldmask as needing
  96 * to be logged when the transaction is committed.  The inode must
  97 * already be associated with the given transaction.
  98 *
  99 * The values for fieldmask are defined in xfs_inode_item.h.  We always
 100 * log all of the core inode if any of it has changed, and we always log
 101 * all of the inline data/extents/b-tree root if any of them has changed.
 102 */
 103void
 104xfs_trans_log_inode(
 105        xfs_trans_t     *tp,
 106        xfs_inode_t     *ip,
 107        uint            flags)
 108{
 109        ASSERT(ip->i_itemp != NULL);
 110        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 111
 112        /*
 113         * First time we log the inode in a transaction, bump the inode change
 114         * counter if it is configured for this to occur. We don't use
 115         * inode_inc_version() because there is no need for extra locking around
 116         * i_version as we already hold the inode locked exclusively for
 117         * metadata modification.
 118         */
 119        if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
 120            IS_I_VERSION(VFS_I(ip))) {
 121                ip->i_d.di_changecount = ++VFS_I(ip)->i_version;
 122                flags |= XFS_ILOG_CORE;
 123        }
 124
 125        tp->t_flags |= XFS_TRANS_DIRTY;
 126        ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 127
 128        /*
 129         * Always OR in the bits from the ili_last_fields field.
 130         * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 131         * routines in the eventual clearing of the ili_fields bits.
 132         * See the big comment in xfs_iflush() for an explanation of
 133         * this coordination mechanism.
 134         */
 135        flags |= ip->i_itemp->ili_last_fields;
 136        ip->i_itemp->ili_fields |= flags;
 137}
 138