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_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  */
  93 void
  94 xfs_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
 138 int
 139 xfs_trans_roll_inode(
 140         struct xfs_trans        **tpp,
 141         struct xfs_inode        *ip)
 142 {
 143         int                     error;
 144
 145         xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
 146         error = xfs_trans_roll(tpp);
 147         if (!error)
 148                 xfs_trans_ijoin(*tpp, ip, 0);
 149         return error;
 150 }