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_dir.h"
  28 #include "xfs_dir2.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir_sf.h"
  35 #include "xfs_dir2_sf.h"
  36 #include "xfs_attr_sf.h"
  37 #include "xfs_dinode.h"
  38 #include "xfs_inode.h"
  39 #include "xfs_btree.h"
  40 #include "xfs_ialloc.h"
  41 #include "xfs_trans_priv.h"
  42 #include "xfs_inode_item.h"
  43
  44 #ifdef XFS_TRANS_DEBUG
  45 STATIC void
  46 xfs_trans_inode_broot_debug(
  47         xfs_inode_t     *ip);
  48 #else
  49 #define xfs_trans_inode_broot_debug(ip)
  50 #endif
  51
  52
  53 /*
  54  * Get and lock the inode for the caller if it is not already
  55  * locked within the given transaction.  If it is already locked
  56  * within the transaction, just increment its lock recursion count
  57  * and return a pointer to it.
  58  *
  59  * For an inode to be locked in a transaction, the inode lock, as
  60  * opposed to the io lock, must be taken exclusively.  This ensures
  61  * that the inode can be involved in only 1 transaction at a time.
  62  * Lock recursion is handled on the io lock, but only for lock modes
  63  * of equal or lesser strength.  That is, you can recur on the io lock
  64  * held EXCL with a SHARED request but not vice versa.  Also, if
  65  * the inode is already a part of the transaction then you cannot
  66  * go from not holding the io lock to having it EXCL or SHARED.
  67  *
  68  * Use the inode cache routine xfs_inode_incore() to find the inode
  69  * if it is already owned by this transaction.
  70  *
  71  * If we don't already own the inode, use xfs_iget() to get it.
  72  * Since the inode log item structure is embedded in the incore
  73  * inode structure and is initialized when the inode is brought
  74  * into memory, there is nothing to do with it here.
  75  *
  76  * If the given transaction pointer is NULL, just call xfs_iget().
  77  * This simplifies code which must handle both cases.
  78  */
  79 int
  80 xfs_trans_iget(
  81         xfs_mount_t     *mp,
  82         xfs_trans_t     *tp,
  83         xfs_ino_t       ino,
  84         uint            flags,
  85         uint            lock_flags,
  86         xfs_inode_t     **ipp)
  87 {
  88         int                     error;
  89         xfs_inode_t             *ip;
  90         xfs_inode_log_item_t    *iip;
  91
  92         /*
  93          * If the transaction pointer is NULL, just call the normal
  94          * xfs_iget().
  95          */
  96         if (tp == NULL)
  97                 return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0);
  98
  99         /*
 100          * If we find the inode in core with this transaction
 101          * pointer in its i_transp field, then we know we already
 102          * have it locked.  In this case we just increment the lock
 103          * recursion count and return the inode to the caller.
 104          * Assert that the inode is already locked in the mode requested
 105          * by the caller.  We cannot do lock promotions yet, so
 106          * die if someone gets this wrong.
 107          */
 108         if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
 109                 /*
 110                  * Make sure that the inode lock is held EXCL and
 111                  * that the io lock is never upgraded when the inode
 112                  * is already a part of the transaction.
 113                  */
 114                 ASSERT(ip->i_itemp != NULL);
 115                 ASSERT(lock_flags & XFS_ILOCK_EXCL);
 116                 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 117                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 118                        ismrlocked(&ip->i_iolock, MR_UPDATE));
 119                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 120                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
 121                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 122                        ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS)));
 123                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 124                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
 125
 126                 if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
 127                         ip->i_itemp->ili_iolock_recur++;
 128                 }
 129                 if (lock_flags & XFS_ILOCK_EXCL) {
 130                         ip->i_itemp->ili_ilock_recur++;
 131                 }
 132                 *ipp = ip;
 133                 return 0;
 134         }
 135
 136         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 137         error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0);
 138         if (error) {
 139                 return error;
 140         }
 141         ASSERT(ip != NULL);
 142
 143         /*
 144          * Get a log_item_desc to point at the new item.
 145          */
 146         if (ip->i_itemp == NULL)
 147                 xfs_inode_item_init(ip, mp);
 148         iip = ip->i_itemp;
 149         (void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip));
 150
 151         xfs_trans_inode_broot_debug(ip);
 152
 153         /*
 154          * If the IO lock has been acquired, mark that in
 155          * the inode log item so we'll know to unlock it
 156          * when the transaction commits.
 157          */
 158         ASSERT(iip->ili_flags == 0);
 159         if (lock_flags & XFS_IOLOCK_EXCL) {
 160                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 161         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 162                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 163         }
 164
 165         /*
 166          * Initialize i_transp so we can find it with xfs_inode_incore()
 167          * above.
 168          */
 169         ip->i_transp = tp;
 170
 171         *ipp = ip;
 172         return 0;
 173 }
 174
 175 /*
 176  * Add the locked inode to the transaction.
 177  * The inode must be locked, and it cannot be associated with any
 178  * transaction.  The caller must specify the locks already held
 179  * on the inode.
 180  */
 181 void
 182 xfs_trans_ijoin(
 183         xfs_trans_t     *tp,
 184         xfs_inode_t     *ip,
 185         uint            lock_flags)
 186 {
 187         xfs_inode_log_item_t    *iip;
 188
 189         ASSERT(ip->i_transp == NULL);
 190         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 191         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 192         if (ip->i_itemp == NULL)
 193                 xfs_inode_item_init(ip, ip->i_mount);
 194         iip = ip->i_itemp;
 195         ASSERT(iip->ili_flags == 0);
 196         ASSERT(iip->ili_ilock_recur == 0);
 197         ASSERT(iip->ili_iolock_recur == 0);
 198
 199         /*
 200          * Get a log_item_desc to point at the new item.
 201          */
 202         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
 203
 204         xfs_trans_inode_broot_debug(ip);
 205
 206         /*
 207          * If the IO lock is already held, mark that in the inode log item.
 208          */
 209         if (lock_flags & XFS_IOLOCK_EXCL) {
 210                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 211         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 212                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 213         }
 214
 215         /*
 216          * Initialize i_transp so we can find it with xfs_inode_incore()
 217          * in xfs_trans_iget() above.
 218          */
 219         ip->i_transp = tp;
 220 }
 221
 222
 223
 224 /*
 225  * Mark the inode as not needing to be unlocked when the inode item's
 226  * IOP_UNLOCK() routine is called.  The inode must already be locked
 227  * and associated with the given transaction.
 228  */
 229 /*ARGSUSED*/
 230 void
 231 xfs_trans_ihold(
 232         xfs_trans_t     *tp,
 233         xfs_inode_t     *ip)
 234 {
 235         ASSERT(ip->i_transp == tp);
 236         ASSERT(ip->i_itemp != NULL);
 237         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 238
 239         ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
 240 }
 241
 242
 243 /*
 244  * This is called to mark the fields indicated in fieldmask as needing
 245  * to be logged when the transaction is committed.  The inode must
 246  * already be associated with the given transaction.
 247  *
 248  * The values for fieldmask are defined in xfs_inode_item.h.  We always
 249  * log all of the core inode if any of it has changed, and we always log
 250  * all of the inline data/extents/b-tree root if any of them has changed.
 251  */
 252 void
 253 xfs_trans_log_inode(
 254         xfs_trans_t     *tp,
 255         xfs_inode_t     *ip,
 256         uint            flags)
 257 {
 258         xfs_log_item_desc_t     *lidp;
 259
 260         ASSERT(ip->i_transp == tp);
 261         ASSERT(ip->i_itemp != NULL);
 262         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 263
 264         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
 265         ASSERT(lidp != NULL);
 266
 267         tp->t_flags |= XFS_TRANS_DIRTY;
 268         lidp->lid_flags |= XFS_LID_DIRTY;
 269
 270         /*
 271          * Always OR in the bits from the ili_last_fields field.
 272          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 273          * routines in the eventual clearing of the ilf_fields bits.
 274          * See the big comment in xfs_iflush() for an explanation of
 275          * this coordination mechanism.
 276          */
 277         flags |= ip->i_itemp->ili_last_fields;
 278         ip->i_itemp->ili_format.ilf_fields |= flags;
 279 }
 280
 281 #ifdef XFS_TRANS_DEBUG
 282 /*
 283  * Keep track of the state of the inode btree root to make sure we
 284  * log it properly.
 285  */
 286 STATIC void
 287 xfs_trans_inode_broot_debug(
 288         xfs_inode_t     *ip)
 289 {
 290         xfs_inode_log_item_t    *iip;
 291
 292         ASSERT(ip->i_itemp != NULL);
 293         iip = ip->i_itemp;
 294         if (iip->ili_root_size != 0) {
 295                 ASSERT(iip->ili_orig_root != NULL);
 296                 kmem_free(iip->ili_orig_root, iip->ili_root_size);
 297                 iip->ili_root_size = 0;
 298                 iip->ili_orig_root = NULL;
 299         }
 300         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
 301                 ASSERT((ip->i_df.if_broot != NULL) &&
 302                        (ip->i_df.if_broot_bytes > 0));
 303                 iip->ili_root_size = ip->i_df.if_broot_bytes;
 304                 iip->ili_orig_root =
 305                         (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
 306                 memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
 307                       iip->ili_root_size);
 308         }
 309 }
 310 #endif