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 #include <linux/iversion.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  */
  39 void
  40 xfs_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  */
  66 void
  67 xfs_trans_ichgtime(
  68         struct xfs_trans        *tp,
  69         struct xfs_inode        *ip,
  70         int                     flags)
  71 {
  72         struct inode            *inode = VFS_I(ip);
  73         struct timespec         tv;
  74
  75         ASSERT(tp);
  76         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  77
  78         tv = current_time(inode);
  79
  80         if (flags & XFS_ICHGTIME_MOD)
  81                 inode->i_mtime = tv;
  82         if (flags & XFS_ICHGTIME_CHG)
  83                 inode->i_ctime = tv;
  84 }
  85
  86 /*
  87  * This is called to mark the fields indicated in fieldmask as needing
  88  * to be logged when the transaction is committed.  The inode must
  89  * already be associated with the given transaction.
  90  *
  91  * The values for fieldmask are defined in xfs_inode_item.h.  We always
  92  * log all of the core inode if any of it has changed, and we always log
  93  * all of the inline data/extents/b-tree root if any of them has changed.
  94  */
  95 void
  96 xfs_trans_log_inode(
  97         xfs_trans_t     *tp,
  98         xfs_inode_t     *ip,
  99         uint            flags)
 100 {
 101         ASSERT(ip->i_itemp != NULL);
 102         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 103
 104         /*
 105          * Record the specific change for fdatasync optimisation. This
 106          * allows fdatasync to skip log forces for inodes that are only
 107          * timestamp dirty. We do this before the change count so that
 108          * the core being logged in this case does not impact on fdatasync
 109          * behaviour.
 110          */
 111         ip->i_itemp->ili_fsync_fields |= flags;
 112
 113         /*
 114          * First time we log the inode in a transaction, bump the inode change
 115          * counter if it is configured for this to occur. While we have the
 116          * inode locked exclusively for metadata modification, we can usually
 117          * avoid setting XFS_ILOG_CORE if no one has queried the value since
 118          * the last time it was incremented. If we have XFS_ILOG_CORE already
 119          * set however, then go ahead and bump the i_version counter
 120          * unconditionally.
 121          */
 122         if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
 123             IS_I_VERSION(VFS_I(ip))) {
 124                 if (inode_maybe_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE))
 125                         flags |= XFS_ILOG_CORE;
 126         }
 127
 128         tp->t_flags |= XFS_TRANS_DIRTY;
 129         ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 130
 131         /*
 132          * Always OR in the bits from the ili_last_fields field.
 133          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 134          * routines in the eventual clearing of the ili_fields bits.
 135          * See the big comment in xfs_iflush() for an explanation of
 136          * this coordination mechanism.
 137          */
 138         flags |= ip->i_itemp->ili_last_fields;
 139         ip->i_itemp->ili_fields |= flags;
 140 }
 141
 142 int
 143 xfs_trans_roll_inode(
 144         struct xfs_trans        **tpp,
 145         struct xfs_inode        *ip)
 146 {
 147         int                     error;
 148
 149         xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
 150         error = xfs_trans_roll(tpp);
 151         if (!error)
 152                 xfs_trans_ijoin(*tpp, ip, 0);
 153         return error;
 154 }