fs/xfs/xfs_trans_inode.c

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include "xfs.h"
  34 #include "xfs_macros.h"
  35 #include "xfs_types.h"
  36 #include "xfs_inum.h"
  37 #include "xfs_log.h"
  38 #include "xfs_trans.h"
  39 #include "xfs_sb.h"
  40 #include "xfs_ag.h"
  41 #include "xfs_dir.h"
  42 #include "xfs_dir2.h"
  43 #include "xfs_dmapi.h"
  44 #include "xfs_mount.h"
  45 #include "xfs_trans_priv.h"
  46 #include "xfs_alloc_btree.h"
  47 #include "xfs_bmap_btree.h"
  48 #include "xfs_ialloc_btree.h"
  49 #include "xfs_btree.h"
  50 #include "xfs_ialloc.h"
  51 #include "xfs_attr_sf.h"
  52 #include "xfs_dir_sf.h"
  53 #include "xfs_dir2_sf.h"
  54 #include "xfs_dinode.h"
  55 #include "xfs_inode_item.h"
  56 #include "xfs_inode.h"
  57
  58 #ifdef XFS_TRANS_DEBUG
  59 STATIC void
  60 xfs_trans_inode_broot_debug(
  61         xfs_inode_t     *ip);
  62 #else
  63 #define xfs_trans_inode_broot_debug(ip)
  64 #endif
  65
  66
  67 /*
  68  * Get and lock the inode for the caller if it is not already
  69  * locked within the given transaction.  If it is already locked
  70  * within the transaction, just increment its lock recursion count
  71  * and return a pointer to it.
  72  *
  73  * For an inode to be locked in a transaction, the inode lock, as
  74  * opposed to the io lock, must be taken exclusively.  This ensures
  75  * that the inode can be involved in only 1 transaction at a time.
  76  * Lock recursion is handled on the io lock, but only for lock modes
  77  * of equal or lesser strength.  That is, you can recur on the io lock
  78  * held EXCL with a SHARED request but not vice versa.  Also, if
  79  * the inode is already a part of the transaction then you cannot
  80  * go from not holding the io lock to having it EXCL or SHARED.
  81  *
  82  * Use the inode cache routine xfs_inode_incore() to find the inode
  83  * if it is already owned by this transaction.
  84  *
  85  * If we don't already own the inode, use xfs_iget() to get it.
  86  * Since the inode log item structure is embedded in the incore
  87  * inode structure and is initialized when the inode is brought
  88  * into memory, there is nothing to do with it here.
  89  *
  90  * If the given transaction pointer is NULL, just call xfs_iget().
  91  * This simplifies code which must handle both cases.
  92  */
  93 int
  94 xfs_trans_iget(
  95         xfs_mount_t     *mp,
  96         xfs_trans_t     *tp,
  97         xfs_ino_t       ino,
  98         uint            flags,
  99         uint            lock_flags,
 100         xfs_inode_t     **ipp)
 101 {
 102         int                     error;
 103         xfs_inode_t             *ip;
 104         xfs_inode_log_item_t    *iip;
 105
 106         /*
 107          * If the transaction pointer is NULL, just call the normal
 108          * xfs_iget().
 109          */
 110         if (tp == NULL)
 111                 return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0);
 112
 113         /*
 114          * If we find the inode in core with this transaction
 115          * pointer in its i_transp field, then we know we already
 116          * have it locked.  In this case we just increment the lock
 117          * recursion count and return the inode to the caller.
 118          * Assert that the inode is already locked in the mode requested
 119          * by the caller.  We cannot do lock promotions yet, so
 120          * die if someone gets this wrong.
 121          */
 122         if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) {
 123                 /*
 124                  * Make sure that the inode lock is held EXCL and
 125                  * that the io lock is never upgraded when the inode
 126                  * is already a part of the transaction.
 127                  */
 128                 ASSERT(ip->i_itemp != NULL);
 129                 ASSERT(lock_flags & XFS_ILOCK_EXCL);
 130                 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 131                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 132                        ismrlocked(&ip->i_iolock, MR_UPDATE));
 133                 ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) ||
 134                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL));
 135                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 136                        ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS)));
 137                 ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) ||
 138                        (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY));
 139
 140                 if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
 141                         ip->i_itemp->ili_iolock_recur++;
 142                 }
 143                 if (lock_flags & XFS_ILOCK_EXCL) {
 144                         ip->i_itemp->ili_ilock_recur++;
 145                 }
 146                 *ipp = ip;
 147                 return 0;
 148         }
 149
 150         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 151         error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0);
 152         if (error) {
 153                 return error;
 154         }
 155         ASSERT(ip != NULL);
 156
 157         /*
 158          * Get a log_item_desc to point at the new item.
 159          */
 160         if (ip->i_itemp == NULL)
 161                 xfs_inode_item_init(ip, mp);
 162         iip = ip->i_itemp;
 163         (void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip));
 164
 165         xfs_trans_inode_broot_debug(ip);
 166
 167         /*
 168          * If the IO lock has been acquired, mark that in
 169          * the inode log item so we'll know to unlock it
 170          * when the transaction commits.
 171          */
 172         ASSERT(iip->ili_flags == 0);
 173         if (lock_flags & XFS_IOLOCK_EXCL) {
 174                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 175         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 176                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 177         }
 178
 179         /*
 180          * Initialize i_transp so we can find it with xfs_inode_incore()
 181          * above.
 182          */
 183         ip->i_transp = tp;
 184
 185         *ipp = ip;
 186         return 0;
 187 }
 188
 189 /*
 190  * Add the locked inode to the transaction.
 191  * The inode must be locked, and it cannot be associated with any
 192  * transaction.  The caller must specify the locks already held
 193  * on the inode.
 194  */
 195 void
 196 xfs_trans_ijoin(
 197         xfs_trans_t     *tp,
 198         xfs_inode_t     *ip,
 199         uint            lock_flags)
 200 {
 201         xfs_inode_log_item_t    *iip;
 202
 203         ASSERT(ip->i_transp == NULL);
 204         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 205         ASSERT(lock_flags & XFS_ILOCK_EXCL);
 206         if (ip->i_itemp == NULL)
 207                 xfs_inode_item_init(ip, ip->i_mount);
 208         iip = ip->i_itemp;
 209         ASSERT(iip->ili_flags == 0);
 210         ASSERT(iip->ili_ilock_recur == 0);
 211         ASSERT(iip->ili_iolock_recur == 0);
 212
 213         /*
 214          * Get a log_item_desc to point at the new item.
 215          */
 216         (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip));
 217
 218         xfs_trans_inode_broot_debug(ip);
 219
 220         /*
 221          * If the IO lock is already held, mark that in the inode log item.
 222          */
 223         if (lock_flags & XFS_IOLOCK_EXCL) {
 224                 iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL;
 225         } else if (lock_flags & XFS_IOLOCK_SHARED) {
 226                 iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED;
 227         }
 228
 229         /*
 230          * Initialize i_transp so we can find it with xfs_inode_incore()
 231          * in xfs_trans_iget() above.
 232          */
 233         ip->i_transp = tp;
 234 }
 235
 236
 237
 238 /*
 239  * Mark the inode as not needing to be unlocked when the inode item's
 240  * IOP_UNLOCK() routine is called.  The inode must already be locked
 241  * and associated with the given transaction.
 242  */
 243 /*ARGSUSED*/
 244 void
 245 xfs_trans_ihold(
 246         xfs_trans_t     *tp,
 247         xfs_inode_t     *ip)
 248 {
 249         ASSERT(ip->i_transp == tp);
 250         ASSERT(ip->i_itemp != NULL);
 251         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 252
 253         ip->i_itemp->ili_flags |= XFS_ILI_HOLD;
 254 }
 255
 256 /*
 257  * Cancel the previous inode hold request made on this inode
 258  * for this transaction.
 259  */
 260 /*ARGSUSED*/
 261 void
 262 xfs_trans_ihold_release(
 263         xfs_trans_t     *tp,
 264         xfs_inode_t     *ip)
 265 {
 266         ASSERT(ip->i_transp == tp);
 267         ASSERT(ip->i_itemp != NULL);
 268         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 269         ASSERT(ip->i_itemp->ili_flags & XFS_ILI_HOLD);
 270
 271         ip->i_itemp->ili_flags &= ~XFS_ILI_HOLD;
 272 }
 273
 274
 275 /*
 276  * This is called to mark the fields indicated in fieldmask as needing
 277  * to be logged when the transaction is committed.  The inode must
 278  * already be associated with the given transaction.
 279  *
 280  * The values for fieldmask are defined in xfs_inode_item.h.  We always
 281  * log all of the core inode if any of it has changed, and we always log
 282  * all of the inline data/extents/b-tree root if any of them has changed.
 283  */
 284 void
 285 xfs_trans_log_inode(
 286         xfs_trans_t     *tp,
 287         xfs_inode_t     *ip,
 288         uint            flags)
 289 {
 290         xfs_log_item_desc_t     *lidp;
 291
 292         ASSERT(ip->i_transp == tp);
 293         ASSERT(ip->i_itemp != NULL);
 294         ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
 295
 296         lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp));
 297         ASSERT(lidp != NULL);
 298
 299         tp->t_flags |= XFS_TRANS_DIRTY;
 300         lidp->lid_flags |= XFS_LID_DIRTY;
 301
 302         /*
 303          * Always OR in the bits from the ili_last_fields field.
 304          * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
 305          * routines in the eventual clearing of the ilf_fields bits.
 306          * See the big comment in xfs_iflush() for an explanation of
 307          * this coorination mechanism.
 308          */
 309         flags |= ip->i_itemp->ili_last_fields;
 310         ip->i_itemp->ili_format.ilf_fields |= flags;
 311 }
 312
 313 #ifdef XFS_TRANS_DEBUG
 314 /*
 315  * Keep track of the state of the inode btree root to make sure we
 316  * log it properly.
 317  */
 318 STATIC void
 319 xfs_trans_inode_broot_debug(
 320         xfs_inode_t     *ip)
 321 {
 322         xfs_inode_log_item_t    *iip;
 323
 324         ASSERT(ip->i_itemp != NULL);
 325         iip = ip->i_itemp;
 326         if (iip->ili_root_size != 0) {
 327                 ASSERT(iip->ili_orig_root != NULL);
 328                 kmem_free(iip->ili_orig_root, iip->ili_root_size);
 329                 iip->ili_root_size = 0;
 330                 iip->ili_orig_root = NULL;
 331         }
 332         if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
 333                 ASSERT((ip->i_df.if_broot != NULL) &&
 334                        (ip->i_df.if_broot_bytes > 0));
 335                 iip->ili_root_size = ip->i_df.if_broot_bytes;
 336                 iip->ili_orig_root =
 337                         (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
 338                 memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
 339                       iip->ili_root_size);
 340         }
 341 }
 342 #endif