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_types.h"
  21#include "xfs_log.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_mount.h"
  26#include "xfs_bmap_btree.h"
  27#include "xfs_alloc_btree.h"
  28#include "xfs_ialloc_btree.h"
  29#include "xfs_dinode.h"
  30#include "xfs_inode.h"
  31#include "xfs_btree.h"
  32#include "xfs_trans_priv.h"
  33#include "xfs_inode_item.h"
  34#include "xfs_trace.h"
  35
  36/*
  37 * Add a locked inode to the transaction.
  38 *
  39 * The inode must be locked, and it cannot be associated with any transaction.
  40 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
  41 */
  42void
  43xfs_trans_ijoin(
  44        struct xfs_trans        *tp,
  45        struct xfs_inode        *ip,
  46        uint                    lock_flags)
  47{
  48        xfs_inode_log_item_t    *iip;
  49
  50        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  51        if (ip->i_itemp == NULL)
  52                xfs_inode_item_init(ip, ip->i_mount);
  53        iip = ip->i_itemp;
  54
  55        ASSERT(iip->ili_lock_flags == 0);
  56        iip->ili_lock_flags = lock_flags;
  57
  58        /*
  59         * Get a log_item_desc to point at the new item.
  60         */
  61        xfs_trans_add_item(tp, &iip->ili_item);
  62}
  63
  64/*
  65 * Transactional inode timestamp update. Requires the inode to be locked and
  66 * joined to the transaction supplied. Relies on the transaction subsystem to
  67 * track dirty state and update/writeback the inode accordingly.
  68 */
  69void
  70xfs_trans_ichgtime(
  71        struct xfs_trans        *tp,
  72        struct xfs_inode        *ip,
  73        int                     flags)
  74{
  75        struct inode            *inode = VFS_I(ip);
  76        timespec_t              tv;
  77
  78        ASSERT(tp);
  79        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  80
  81        tv = current_fs_time(inode->i_sb);
  82
  83        if ((flags & XFS_ICHGTIME_MOD) &&
  84            !timespec_equal(&inode->i_mtime, &tv)) {
  85                inode->i_mtime = tv;
  86                ip->i_d.di_mtime.t_sec = tv.tv_sec;
  87                ip->i_d.di_mtime.t_nsec = tv.tv_nsec;
  88        }
  89        if ((flags & XFS_ICHGTIME_CHG) &&
  90            !timespec_equal(&inode->i_ctime, &tv)) {
  91                inode->i_ctime = tv;
  92                ip->i_d.di_ctime.t_sec = tv.tv_sec;
  93                ip->i_d.di_ctime.t_nsec = tv.tv_nsec;
  94        }
  95}
  96
  97/*
  98 * This is called to mark the fields indicated in fieldmask as needing
  99 * to be logged when the transaction is committed.  The inode must
 100 * already be associated with the given transaction.
 101 *
 102 * The values for fieldmask are defined in xfs_inode_item.h.  We always
 103 * log all of the core inode if any of it has changed, and we always log
 104 * all of the inline data/extents/b-tree root if any of them has changed.
 105 */
 106void
 107xfs_trans_log_inode(
 108        xfs_trans_t     *tp,
 109        xfs_inode_t     *ip,
 110        uint            flags)
 111{
 112        ASSERT(ip->i_itemp != NULL);
 113        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 114
 115        /*
 116         * First time we log the inode in a transaction, bump the inode change
 117         * counter if it is configured for this to occur.
 118         */
 119        if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
 120            IS_I_VERSION(VFS_I(ip))) {
 121                inode_inc_iversion(VFS_I(ip));
 122                ip->i_d.di_changecount = VFS_I(ip)->i_version;
 123                flags |= XFS_ILOG_CORE;
 124        }
 125
 126        tp->t_flags |= XFS_TRANS_DIRTY;
 127        ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 128
 129        /*
 130         * Always OR in the bits from the ili_last_fields field.
 131         * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 132         * routines in the eventual clearing of the ili_fields bits.
 133         * See the big comment in xfs_iflush() for an explanation of
 134         * this coordination mechanism.
 135         */
 136        flags |= ip->i_itemp->ili_last_fields;
 137        ip->i_itemp->ili_fields |= flags;
 138}
 139