kernel/2.6.29.6-aldebaran-rt/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_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_btree.h"
  38 #include "xfs_ialloc.h"
  39 #include "xfs_trans_priv.h"
  40 #include "xfs_inode_item.h"
  41
  42 #ifdef XFS_TRANS_DEBUG
  43 STATIC void
  44 xfs_trans_inode_broot_debug(
  45         xfs_inode_t     *ip);
  46 #else
  47 #define xfs_trans_inode_broot_debug(ip)
  48 #endif
  49
  50
  51 /*
  52  * Get and lock the inode for the caller if it is not already
  53  * locked within the given transaction.  If it is already locked
  54  * within the transaction, just increment its lock recursion count
  55  * and return a pointer to it.
  56  *
  57  * For an inode to be locked in a transaction, the inode lock, as
  58  * opposed to the io lock, must be taken exclusively.  This ensures
  59  * that the inode can be involved in only 1 transaction at a time.
  60  * Lock recursion is handled on the io lock, but only for lock modes
  61  * of equal or lesser strength.  That is, you can recur on the io lock
  62  * held EXCL with a SHARED request but not vice versa.  Also, if
  63  * the inode is already a part of the transaction then you cannot
  64  * go from not holding the io lock to having it EXCL or SHARED.
  65  *
  66  * Use the inode cache routine xfs_inode_incore() to find the inode
  67  * if it is already owned by this transaction.
  68  *
  69  * If we don't already own the inode, use xfs_iget() to get it.
  70  * Since the inode log item structure is embedded in the incore
  71  * inode structure and is initialized when the inode is brought
  72  * into memory, there is nothing to do with it here.
  73  *
  74  * If the given transaction pointer is NULL, just call xfs_iget().
  75  * This simplifies code which must handle both cases.
  76  */
  77 int
  78 xfs_trans_iget(
  79         xfs_mount_t     *mp,
  80         xfs_trans_t     *tp,
  81         xfs_ino_t       ino,
  82         uint            flags,
  83         uint            lock_flags,
  84         xfs_inode_t     **ipp)
  85 {
  86         int                     error;
  87         xfs_inode_t             *ip;
  88
  89         /*
  90          * If the transaction pointer is NULL, just call the normal
  91          * xfs_iget().
  92          */
  93         if (tp == NULL)
  94                 return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0);
  95
  96         /*
  97          * If we find the inode in core with this transaction
  98          * pointer in its i_transp field, then we know we already
  99          * have it locked.  In this case we just increment the lock
 100          * recursion count and return the inode to the caller.
 101          * Assert that the inode is already locked in the mode requested
 102          * by the caller.  We cannot do lock promotions yet, so
 103          * die if someone gets this wrong.
 104          */
 105         if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
 106                 /*
 107                  * Make sure that the inode lock is held EXCL and
 108                  * that the io lock is never upgraded when the inode
 109                  * is already a part of the transaction.
 110                  */
 111                 ASSERT(ip->i_itemp != NULL);
 112                 ASSERT(lock_flags & XFS_ILOCK_EXCL);
 113                 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 114                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 115                        xfs_isilocked(ip, XFS_IOLOCK_EXCL));
 116                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 117                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
 118                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 119                        xfs_isilocked(ip, XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED));
 120                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 121                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
 122
 123                 if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
 124                         ip->i_itemp->ili_iolock_recur++;
 125                 }
 126                 if (lock_flags & XFS_ILOCK_EXCL) {
 127                         ip->i_itemp->ili_ilock_recur++;
 128                 }
 129                 *ipp = ip;
 130                 return 0;
 131         }
 132
 133         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 134         error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0);
 135         if (error) {
 136                 return error;
 137         }
 138         ASSERT(ip != NULL);
 139
 140         xfs_trans_ijoin(tp, ip, lock_flags);
 141         *ipp = ip;
 142         return 0;
 143 }
 144
 145 /*
 146  * Add the locked inode to the transaction.
 147  * The inode must be locked, and it cannot be associated with any
 148  * transaction.  The caller must specify the locks already held
 149  * on the inode.
 150  */
 151 void
 152 xfs_trans_ijoin(
 153         xfs_trans_t     *tp,
 154         xfs_inode_t     *ip,
 155         uint            lock_flags)
 156 {
 157         xfs_inode_log_item_t    *iip;
 158
 159         ASSERT(ip->i_transp == NULL);
 160         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 161         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 162         if (ip->i_itemp == NULL)
 163                 xfs_inode_item_init(ip, ip->i_mount);
 164         iip = ip->i_itemp;
 165         ASSERT(iip->ili_flags == 0);
 166         ASSERT(iip->ili_ilock_recur == 0);
 167         ASSERT(iip->ili_iolock_recur == 0);
 168
 169         /*
 170          * Get a log_item_desc to point at the new item.
 171          */
 172         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
 173
 174         xfs_trans_inode_broot_debug(ip);
 175
 176         /*
 177          * If the IO lock is already held, mark that in the inode log item.
 178          */
 179         if (lock_flags & XFS_IOLOCK_EXCL) {
 180                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 181         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 182                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 183         }
 184
 185         /*
 186          * Initialize i_transp so we can find it with xfs_inode_incore()
 187          * in xfs_trans_iget() above.
 188          */
 189         ip->i_transp = tp;
 190 }
 191
 192
 193
 194 /*
 195  * Mark the inode as not needing to be unlocked when the inode item's
 196  * IOP_UNLOCK() routine is called.  The inode must already be locked
 197  * and associated with the given transaction.
 198  */
 199 /*ARGSUSED*/
 200 void
 201 xfs_trans_ihold(
 202         xfs_trans_t     *tp,
 203         xfs_inode_t     *ip)
 204 {
 205         ASSERT(ip->i_transp == tp);
 206         ASSERT(ip->i_itemp != NULL);
 207         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 208
 209         ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
 210 }
 211
 212
 213 /*
 214  * This is called to mark the fields indicated in fieldmask as needing
 215  * to be logged when the transaction is committed.  The inode must
 216  * already be associated with the given transaction.
 217  *
 218  * The values for fieldmask are defined in xfs_inode_item.h.  We always
 219  * log all of the core inode if any of it has changed, and we always log
 220  * all of the inline data/extents/b-tree root if any of them has changed.
 221  */
 222 void
 223 xfs_trans_log_inode(
 224         xfs_trans_t     *tp,
 225         xfs_inode_t     *ip,
 226         uint            flags)
 227 {
 228         xfs_log_item_desc_t     *lidp;
 229
 230         ASSERT(ip->i_transp == tp);
 231         ASSERT(ip->i_itemp != NULL);
 232         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 233
 234         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
 235         ASSERT(lidp != NULL);
 236
 237         tp->t_flags |= XFS_TRANS_DIRTY;
 238         lidp->lid_flags |= XFS_LID_DIRTY;
 239
 240         /*
 241          * Always OR in the bits from the ili_last_fields field.
 242          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 243          * routines in the eventual clearing of the ilf_fields bits.
 244          * See the big comment in xfs_iflush() for an explanation of
 245          * this coordination mechanism.
 246          */
 247         flags |= ip->i_itemp->ili_last_fields;
 248         ip->i_itemp->ili_format.ilf_fields |= flags;
 249 }
 250
 251 #ifdef XFS_TRANS_DEBUG
 252 /*
 253  * Keep track of the state of the inode btree root to make sure we
 254  * log it properly.
 255  */
 256 STATIC void
 257 xfs_trans_inode_broot_debug(
 258         xfs_inode_t     *ip)
 259 {
 260         xfs_inode_log_item_t    *iip;
 261
 262         ASSERT(ip->i_itemp != NULL);
 263         iip = ip->i_itemp;
 264         if (iip->ili_root_size != 0) {
 265                 ASSERT(iip->ili_orig_root != NULL);
 266                 kmem_free(iip->ili_orig_root);
 267                 iip->ili_root_size = 0;
 268                 iip->ili_orig_root = NULL;
 269         }
 270         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
 271                 ASSERT((ip->i_df.if_broot != NULL) &&
 272                        (ip->i_df.if_broot_bytes > 0));
 273                 iip->ili_root_size = ip->i_df.if_broot_bytes;
 274                 iip->ili_orig_root =
 275                         (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
 276                 memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
 277                       iip->ili_root_size);
 278         }
 279 }
 280 #endif