fs/xfs/xfs_trans_inode.c

   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  */
  37 void
  38 xfs_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  */
  64 void
  65 xfs_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_fs_time(inode->i_sb);
  77
  78         if ((flags & XFS_ICHGTIME_MOD) &&
  79             !timespec_equal(&inode->i_mtime, &tv)) {
  80                 inode->i_mtime = tv;
  81                 ip->i_d.di_mtime.t_sec = tv.tv_sec;
  82                 ip->i_d.di_mtime.t_nsec = tv.tv_nsec;
  83         }
  84         if ((flags & XFS_ICHGTIME_CHG) &&
  85             !timespec_equal(&inode->i_ctime, &tv)) {
  86                 inode->i_ctime = tv;
  87                 ip->i_d.di_ctime.t_sec = tv.tv_sec;
  88                 ip->i_d.di_ctime.t_nsec = tv.tv_nsec;
  89         }
  90 }
  91
  92 /*
  93  * This is called to mark the fields indicated in fieldmask as needing
  94  * to be logged when the transaction is committed.  The inode must
  95  * already be associated with the given transaction.
  96  *
  97  * The values for fieldmask are defined in xfs_inode_item.h.  We always
  98  * log all of the core inode if any of it has changed, and we always log
  99  * all of the inline data/extents/b-tree root if any of them has changed.
 100  */
 101 void
 102 xfs_trans_log_inode(
 103         xfs_trans_t     *tp,
 104         xfs_inode_t     *ip,
 105         uint            flags)
 106 {
 107         ASSERT(ip->i_itemp != NULL);
 108         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 109
 110         /*
 111          * Record the specific change for fdatasync optimisation. This
 112          * allows fdatasync to skip log forces for inodes that are only
 113          * timestamp dirty. We do this before the change count so that
 114          * the core being logged in this case does not impact on fdatasync
 115          * behaviour.
 116          */
 117         ip->i_itemp->ili_fsync_fields |= flags;
 118
 119         /*
 120          * First time we log the inode in a transaction, bump the inode change
 121          * counter if it is configured for this to occur. We don't use
 122          * inode_inc_version() because there is no need for extra locking around
 123          * i_version as we already hold the inode locked exclusively for
 124          * metadata modification.
 125          */
 126         if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
 127             IS_I_VERSION(VFS_I(ip))) {
 128                 ip->i_d.di_changecount = ++VFS_I(ip)->i_version;
 129                 flags |= XFS_ILOG_CORE;
 130         }
 131
 132         tp->t_flags |= XFS_TRANS_DIRTY;
 133         ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 134
 135         /*
 136          * Always OR in the bits from the ili_last_fields field.
 137          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 138          * routines in the eventual clearing of the ili_fields bits.
 139          * See the big comment in xfs_iflush() for an explanation of
 140          * this coordination mechanism.
 141          */
 142         flags |= ip->i_itemp->ili_last_fields;
 143         ip->i_itemp->ili_fields |= flags;
 144 }