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_mount.h"
  25#include "xfs_inode.h"
  26#include "xfs_trans.h"
  27#include "xfs_trans_priv.h"
  28#include "xfs_inode_item.h"
  29#include "xfs_trace.h"
  30
  31/*
  32 * Add a locked inode to the transaction.
  33 *
  34 * The inode must be locked, and it cannot be associated with any transaction.
  35 * If lock_flags is non-zero the inode will be unlocked on transaction commit.
  36 */
  37void
  38xfs_trans_ijoin(
  39        struct xfs_trans        *tp,
  40        struct xfs_inode        *ip,
  41        uint                    lock_flags)
  42{
  43        xfs_inode_log_item_t    *iip;
  44
  45        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  46        if (ip->i_itemp == NULL)
  47                xfs_inode_item_init(ip, ip->i_mount);
  48        iip = ip->i_itemp;
  49
  50        ASSERT(iip->ili_lock_flags == 0);
  51        iip->ili_lock_flags = lock_flags;
  52
  53        /*
  54         * Get a log_item_desc to point at the new item.
  55         */
  56        xfs_trans_add_item(tp, &iip->ili_item);
  57}
  58
  59/*
  60 * Transactional inode timestamp update. Requires the inode to be locked and
  61 * joined to the transaction supplied. Relies on the transaction subsystem to
  62 * track dirty state and update/writeback the inode accordingly.
  63 */
  64void
  65xfs_trans_ichgtime(
  66        struct xfs_trans        *tp,
  67        struct xfs_inode        *ip,
  68        int                     flags)
  69{
  70        struct inode            *inode = VFS_I(ip);
  71        struct timespec         tv;
  72
  73        ASSERT(tp);
  74        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  75
  76        tv = current_time(inode);
  77
  78        if (flags & XFS_ICHGTIME_MOD)
  79                inode->i_mtime = tv;
  80        if (flags & XFS_ICHGTIME_CHG)
  81                inode->i_ctime = tv;
  82}
  83
  84/*
  85 * This is called to mark the fields indicated in fieldmask as needing
  86 * to be logged when the transaction is committed.  The inode must
  87 * already be associated with the given transaction.
  88 *
  89 * The values for fieldmask are defined in xfs_inode_item.h.  We always
  90 * log all of the core inode if any of it has changed, and we always log
  91 * all of the inline data/extents/b-tree root if any of them has changed.
  92 */
  93void
  94xfs_trans_log_inode(
  95        xfs_trans_t     *tp,
  96        xfs_inode_t     *ip,
  97        uint            flags)
  98{
  99        ASSERT(ip->i_itemp != NULL);
 100        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 101
 102        /*
 103         * Record the specific change for fdatasync optimisation. This
 104         * allows fdatasync to skip log forces for inodes that are only
 105         * timestamp dirty. We do this before the change count so that
 106         * the core being logged in this case does not impact on fdatasync
 107         * behaviour.
 108         */
 109        ip->i_itemp->ili_fsync_fields |= flags;
 110
 111        /*
 112         * First time we log the inode in a transaction, bump the inode change
 113         * counter if it is configured for this to occur. We don't use
 114         * inode_inc_version() because there is no need for extra locking around
 115         * i_version as we already hold the inode locked exclusively for
 116         * metadata modification.
 117         */
 118        if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
 119            IS_I_VERSION(VFS_I(ip))) {
 120                VFS_I(ip)->i_version++;
 121                flags |= XFS_ILOG_CORE;
 122        }
 123
 124        tp->t_flags |= XFS_TRANS_DIRTY;
 125        ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 126
 127        /*
 128         * Always OR in the bits from the ili_last_fields field.
 129         * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 130         * routines in the eventual clearing of the ili_fields bits.
 131         * See the big comment in xfs_iflush() for an explanation of
 132         * this coordination mechanism.
 133         */
 134        flags |= ip->i_itemp->ili_last_fields;
 135        ip->i_itemp->ili_fields |= flags;
 136}
 137