release/src-rt-6.x.4708/linux/linux-2.6.36/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_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_alloc_btree.h"
  30 #include "xfs_ialloc_btree.h"
  31 #include "xfs_dinode.h"
  32 #include "xfs_inode.h"
  33 #include "xfs_btree.h"
  34 #include "xfs_trans_priv.h"
  35 #include "xfs_inode_item.h"
  36 #include "xfs_trace.h"
  37
  38 #ifdef XFS_TRANS_DEBUG
  39 STATIC void
  40 xfs_trans_inode_broot_debug(
  41         xfs_inode_t     *ip);
  42 #else
  43 #define xfs_trans_inode_broot_debug(ip)
  44 #endif
  45
  46 /*
  47  * Get an inode and join it to the transaction.
  48  */
  49 int
  50 xfs_trans_iget(
  51         xfs_mount_t     *mp,
  52         xfs_trans_t     *tp,
  53         xfs_ino_t       ino,
  54         uint            flags,
  55         uint            lock_flags,
  56         xfs_inode_t     **ipp)
  57 {
  58         int                     error;
  59
  60         error = xfs_iget(mp, tp, ino, flags, lock_flags, ipp);
  61         if (!error && tp) {
  62                 xfs_trans_ijoin(tp, *ipp);
  63                 (*ipp)->i_itemp->ili_lock_flags = lock_flags;
  64         }
  65         return error;
  66 }
  67
  68 /*
  69  * Add a locked inode to the transaction.
  70  *
  71  * The inode must be locked, and it cannot be associated with any transaction.
  72  */
  73 void
  74 xfs_trans_ijoin(
  75         struct xfs_trans        *tp,
  76         struct xfs_inode        *ip)
  77 {
  78         xfs_inode_log_item_t    *iip;
  79
  80         ASSERT(ip->i_transp == NULL);
  81         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
  82         if (ip->i_itemp == NULL)
  83                 xfs_inode_item_init(ip, ip->i_mount);
  84         iip = ip->i_itemp;
  85         ASSERT(iip->ili_lock_flags == 0);
  86
  87         /*
  88          * Get a log_item_desc to point at the new item.
  89          */
  90         xfs_trans_add_item(tp, &iip->ili_item);
  91
  92         xfs_trans_inode_broot_debug(ip);
  93
  94         /*
  95          * Initialize i_transp so we can find it with xfs_inode_incore()
  96          * in xfs_trans_iget() above.
  97          */
  98         ip->i_transp = tp;
  99 }
 100
 101 /*
 102  * Add a locked inode to the transaction.
 103  *
 104  *
 105  * Grabs a reference to the inode which will be dropped when the transaction
 106  * is commited.  The inode will also be unlocked at that point.  The inode
 107  * must be locked, and it cannot be associated with any transaction.
 108  */
 109 void
 110 xfs_trans_ijoin_ref(
 111         struct xfs_trans        *tp,
 112         struct xfs_inode        *ip,
 113         uint                    lock_flags)
 114 {
 115         xfs_trans_ijoin(tp, ip);
 116         IHOLD(ip);
 117         ip->i_itemp->ili_lock_flags = lock_flags;
 118 }
 119
 120 /*
 121  * This is called to mark the fields indicated in fieldmask as needing
 122  * to be logged when the transaction is committed.  The inode must
 123  * already be associated with the given transaction.
 124  *
 125  * The values for fieldmask are defined in xfs_inode_item.h.  We always
 126  * log all of the core inode if any of it has changed, and we always log
 127  * all of the inline data/extents/b-tree root if any of them has changed.
 128  */
 129 void
 130 xfs_trans_log_inode(
 131         xfs_trans_t     *tp,
 132         xfs_inode_t     *ip,
 133         uint            flags)
 134 {
 135         ASSERT(ip->i_transp == tp);
 136         ASSERT(ip->i_itemp != NULL);
 137         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 138
 139         tp->t_flags |= XFS_TRANS_DIRTY;
 140         ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 141
 142         /*
 143          * Always OR in the bits from the ili_last_fields field.
 144          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 145          * routines in the eventual clearing of the ilf_fields bits.
 146          * See the big comment in xfs_iflush() for an explanation of
 147          * this coordination mechanism.
 148          */
 149         flags |= ip->i_itemp->ili_last_fields;
 150         ip->i_itemp->ili_format.ilf_fields |= flags;
 151 }
 152
 153 #ifdef XFS_TRANS_DEBUG
 154 /*
 155  * Keep track of the state of the inode btree root to make sure we
 156  * log it properly.
 157  */
 158 STATIC void
 159 xfs_trans_inode_broot_debug(
 160         xfs_inode_t     *ip)
 161 {
 162         xfs_inode_log_item_t    *iip;
 163
 164         ASSERT(ip->i_itemp != NULL);
 165         iip = ip->i_itemp;
 166         if (iip->ili_root_size != 0) {
 167                 ASSERT(iip->ili_orig_root != NULL);
 168                 kmem_free(iip->ili_orig_root);
 169                 iip->ili_root_size = 0;
 170                 iip->ili_orig_root = NULL;
 171         }
 172         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
 173                 ASSERT((ip->i_df.if_broot != NULL) &&
 174                        (ip->i_df.if_broot_bytes > 0));
 175                 iip->ili_root_size = ip->i_df.if_broot_bytes;
 176                 iip->ili_orig_root =
 177                         (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
 178                 memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
 179                       iip->ili_root_size);
 180         }
 181 }
 182 #endif