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         xfs_inode_log_item_t    *iip;
  89
  90         /*
  91          * If the transaction pointer is NULL, just call the normal
  92          * xfs_iget().
  93          */
  94         if (tp == NULL)
  95                 return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0);
  96
  97         /*
  98          * If we find the inode in core with this transaction
  99          * pointer in its i_transp field, then we know we already
 100          * have it locked.  In this case we just increment the lock
 101          * recursion count and return the inode to the caller.
 102          * Assert that the inode is already locked in the mode requested
 103          * by the caller.  We cannot do lock promotions yet, so
 104          * die if someone gets this wrong.
 105          */
 106         if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
 107                 /*
 108                  * Make sure that the inode lock is held EXCL and
 109                  * that the io lock is never upgraded when the inode
 110                  * is already a part of the transaction.
 111                  */
 112                 ASSERT(ip->i_itemp != NULL);
 113                 ASSERT(lock_flags & XFS_ILOCK_EXCL);
 114                 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 115                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 116                        ismrlocked(&ip->i_iolock, MR_UPDATE));
 117                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 118                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
 119                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 120                        ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS)));
 121                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 122                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
 123
 124                 if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
 125                         ip->i_itemp->ili_iolock_recur++;
 126                 }
 127                 if (lock_flags & XFS_ILOCK_EXCL) {
 128                         ip->i_itemp->ili_ilock_recur++;
 129                 }
 130                 *ipp = ip;
 131                 return 0;
 132         }
 133
 134         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 135         error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0);
 136         if (error) {
 137                 return error;
 138         }
 139         ASSERT(ip != NULL);
 140
 141         /*
 142          * Get a log_item_desc to point at the new item.
 143          */
 144         if (ip->i_itemp == NULL)
 145                 xfs_inode_item_init(ip, mp);
 146         iip = ip->i_itemp;
 147         (void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip));
 148
 149         xfs_trans_inode_broot_debug(ip);
 150
 151         /*
 152          * If the IO lock has been acquired, mark that in
 153          * the inode log item so we'll know to unlock it
 154          * when the transaction commits.
 155          */
 156         ASSERT(iip->ili_flags == 0);
 157         if (lock_flags & XFS_IOLOCK_EXCL) {
 158                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 159         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 160                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 161         }
 162
 163         /*
 164          * Initialize i_transp so we can find it with xfs_inode_incore()
 165          * above.
 166          */
 167         ip->i_transp = tp;
 168
 169         *ipp = ip;
 170         return 0;
 171 }
 172
 173 /*
 174  * Add the locked inode to the transaction.
 175  * The inode must be locked, and it cannot be associated with any
 176  * transaction.  The caller must specify the locks already held
 177  * on the inode.
 178  */
 179 void
 180 xfs_trans_ijoin(
 181         xfs_trans_t     *tp,
 182         xfs_inode_t     *ip,
 183         uint            lock_flags)
 184 {
 185         xfs_inode_log_item_t    *iip;
 186
 187         ASSERT(ip->i_transp == NULL);
 188         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 189         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 190         if (ip->i_itemp == NULL)
 191                 xfs_inode_item_init(ip, ip->i_mount);
 192         iip = ip->i_itemp;
 193         ASSERT(iip->ili_flags == 0);
 194         ASSERT(iip->ili_ilock_recur == 0);
 195         ASSERT(iip->ili_iolock_recur == 0);
 196
 197         /*
 198          * Get a log_item_desc to point at the new item.
 199          */
 200         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
 201
 202         xfs_trans_inode_broot_debug(ip);
 203
 204         /*
 205          * If the IO lock is already held, mark that in the inode log item.
 206          */
 207         if (lock_flags & XFS_IOLOCK_EXCL) {
 208                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 209         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 210                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 211         }
 212
 213         /*
 214          * Initialize i_transp so we can find it with xfs_inode_incore()
 215          * in xfs_trans_iget() above.
 216          */
 217         ip->i_transp = tp;
 218 }
 219
 220
 221
 222 /*
 223  * Mark the inode as not needing to be unlocked when the inode item's
 224  * IOP_UNLOCK() routine is called.  The inode must already be locked
 225  * and associated with the given transaction.
 226  */
 227 /*ARGSUSED*/
 228 void
 229 xfs_trans_ihold(
 230         xfs_trans_t     *tp,
 231         xfs_inode_t     *ip)
 232 {
 233         ASSERT(ip->i_transp == tp);
 234         ASSERT(ip->i_itemp != NULL);
 235         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 236
 237         ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
 238 }
 239
 240
 241 /*
 242  * This is called to mark the fields indicated in fieldmask as needing
 243  * to be logged when the transaction is committed.  The inode must
 244  * already be associated with the given transaction.
 245  *
 246  * The values for fieldmask are defined in xfs_inode_item.h.  We always
 247  * log all of the core inode if any of it has changed, and we always log
 248  * all of the inline data/extents/b-tree root if any of them has changed.
 249  */
 250 void
 251 xfs_trans_log_inode(
 252         xfs_trans_t     *tp,
 253         xfs_inode_t     *ip,
 254         uint            flags)
 255 {
 256         xfs_log_item_desc_t     *lidp;
 257
 258         ASSERT(ip->i_transp == tp);
 259         ASSERT(ip->i_itemp != NULL);
 260         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 261
 262         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
 263         ASSERT(lidp != NULL);
 264
 265         tp->t_flags |= XFS_TRANS_DIRTY;
 266         lidp->lid_flags |= XFS_LID_DIRTY;
 267
 268         /*
 269          * Always OR in the bits from the ili_last_fields field.
 270          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 271          * routines in the eventual clearing of the ilf_fields bits.
 272          * See the big comment in xfs_iflush() for an explanation of
 273          * this coordination mechanism.
 274          */
 275         flags |= ip->i_itemp->ili_last_fields;
 276         ip->i_itemp->ili_format.ilf_fields |= flags;
 277 }
 278
 279 #ifdef XFS_TRANS_DEBUG
 280 /*
 281  * Keep track of the state of the inode btree root to make sure we
 282  * log it properly.
 283  */
 284 STATIC void
 285 xfs_trans_inode_broot_debug(
 286         xfs_inode_t     *ip)
 287 {
 288         xfs_inode_log_item_t    *iip;
 289
 290         ASSERT(ip->i_itemp != NULL);
 291         iip = ip->i_itemp;
 292         if (iip->ili_root_size != 0) {
 293                 ASSERT(iip->ili_orig_root != NULL);
 294                 kmem_free(iip->ili_orig_root, iip->ili_root_size);
 295                 iip->ili_root_size = 0;
 296                 iip->ili_orig_root = NULL;
 297         }
 298         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
 299                 ASSERT((ip->i_df.if_broot != NULL) &&
 300                        (ip->i_df.if_broot_bytes > 0));
 301                 iip->ili_root_size = ip->i_df.if_broot_bytes;
 302                 iip->ili_orig_root =
 303                         (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
 304                 memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
 305                       iip->ili_root_size);
 306         }
 307 }
 308 #endif