fs/xfs/xfs_inode_item_recover.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_inode.h"
  14 #include "xfs_trans.h"
  15 #include "xfs_inode_item.h"
  16 #include "xfs_trace.h"
  17 #include "xfs_trans_priv.h"
  18 #include "xfs_buf_item.h"
  19 #include "xfs_log.h"
  20 #include "xfs_error.h"
  21 #include "xfs_log_priv.h"
  22 #include "xfs_log_recover.h"
  23 #include "xfs_icache.h"
  24 #include "xfs_bmap_btree.h"
  25
  26 STATIC void
  27 xlog_recover_inode_ra_pass2(
  28         struct xlog                     *log,
  29         struct xlog_recover_item        *item)
  30 {
  31         if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
  32                 struct xfs_inode_log_format     *ilfp = item->ri_buf[0].i_addr;
  33
  34                 xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
  35                                    &xfs_inode_buf_ra_ops);
  36         } else {
  37                 struct xfs_inode_log_format_32  *ilfp = item->ri_buf[0].i_addr;
  38
  39                 xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
  40                                    &xfs_inode_buf_ra_ops);
  41         }
  42 }
  43
  44 /*
  45  * Inode fork owner changes
  46  *
  47  * If we have been told that we have to reparent the inode fork, it's because an
  48  * extent swap operation on a CRC enabled filesystem has been done and we are
  49  * replaying it. We need to walk the BMBT of the appropriate fork and change the
  50  * owners of it.
  51  *
  52  * The complexity here is that we don't have an inode context to work with, so
  53  * after we've replayed the inode we need to instantiate one.  This is where the
  54  * fun begins.
  55  *
  56  * We are in the middle of log recovery, so we can't run transactions. That
  57  * means we cannot use cache coherent inode instantiation via xfs_iget(), as
  58  * that will result in the corresponding iput() running the inode through
  59  * xfs_inactive(). If we've just replayed an inode core that changes the link
  60  * count to zero (i.e. it's been unlinked), then xfs_inactive() will run
  61  * transactions (bad!).
  62  *
  63  * So, to avoid this, we instantiate an inode directly from the inode core we've
  64  * just recovered. We have the buffer still locked, and all we really need to
  65  * instantiate is the inode core and the forks being modified. We can do this
  66  * manually, then run the inode btree owner change, and then tear down the
  67  * xfs_inode without having to run any transactions at all.
  68  *
  69  * Also, because we don't have a transaction context available here but need to
  70  * gather all the buffers we modify for writeback so we pass the buffer_list
  71  * instead for the operation to use.
  72  */
  73
  74 STATIC int
  75 xfs_recover_inode_owner_change(
  76         struct xfs_mount        *mp,
  77         struct xfs_dinode       *dip,
  78         struct xfs_inode_log_format *in_f,
  79         struct list_head        *buffer_list)
  80 {
  81         struct xfs_inode        *ip;
  82         int                     error;
  83
  84         ASSERT(in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER));
  85
  86         ip = xfs_inode_alloc(mp, in_f->ilf_ino);
  87         if (!ip)
  88                 return -ENOMEM;
  89
  90         /* instantiate the inode */
  91         ASSERT(dip->di_version >= 3);
  92
  93         error = xfs_inode_from_disk(ip, dip);
  94         if (error)
  95                 goto out_free_ip;
  96
  97         if (in_f->ilf_fields & XFS_ILOG_DOWNER) {
  98                 ASSERT(in_f->ilf_fields & XFS_ILOG_DBROOT);
  99                 error = xfs_bmbt_change_owner(NULL, ip, XFS_DATA_FORK,
 100                                               ip->i_ino, buffer_list);
 101                 if (error)
 102                         goto out_free_ip;
 103         }
 104
 105         if (in_f->ilf_fields & XFS_ILOG_AOWNER) {
 106                 ASSERT(in_f->ilf_fields & XFS_ILOG_ABROOT);
 107                 error = xfs_bmbt_change_owner(NULL, ip, XFS_ATTR_FORK,
 108                                               ip->i_ino, buffer_list);
 109                 if (error)
 110                         goto out_free_ip;
 111         }
 112
 113 out_free_ip:
 114         xfs_inode_free(ip);
 115         return error;
 116 }
 117
 118 static inline bool xfs_log_dinode_has_bigtime(const struct xfs_log_dinode *ld)
 119 {
 120         return ld->di_version >= 3 &&
 121                (ld->di_flags2 & XFS_DIFLAG2_BIGTIME);
 122 }
 123
 124 /* Convert a log timestamp to an ondisk timestamp. */
 125 static inline xfs_timestamp_t
 126 xfs_log_dinode_to_disk_ts(
 127         struct xfs_log_dinode           *from,
 128         const xfs_ictimestamp_t         its)
 129 {
 130         struct xfs_legacy_timestamp     *lts;
 131         struct xfs_legacy_ictimestamp   *lits;
 132         xfs_timestamp_t                 ts;
 133
 134         if (xfs_log_dinode_has_bigtime(from))
 135                 return cpu_to_be64(its);
 136
 137         lts = (struct xfs_legacy_timestamp *)&ts;
 138         lits = (struct xfs_legacy_ictimestamp *)&its;
 139         lts->t_sec = cpu_to_be32(lits->t_sec);
 140         lts->t_nsec = cpu_to_be32(lits->t_nsec);
 141
 142         return ts;
 143 }
 144
 145 STATIC void
 146 xfs_log_dinode_to_disk(
 147         struct xfs_log_dinode   *from,
 148         struct xfs_dinode       *to)
 149 {
 150         to->di_magic = cpu_to_be16(from->di_magic);
 151         to->di_mode = cpu_to_be16(from->di_mode);
 152         to->di_version = from->di_version;
 153         to->di_format = from->di_format;
 154         to->di_onlink = 0;
 155         to->di_uid = cpu_to_be32(from->di_uid);
 156         to->di_gid = cpu_to_be32(from->di_gid);
 157         to->di_nlink = cpu_to_be32(from->di_nlink);
 158         to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
 159         to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
 160         memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
 161
 162         to->di_atime = xfs_log_dinode_to_disk_ts(from, from->di_atime);
 163         to->di_mtime = xfs_log_dinode_to_disk_ts(from, from->di_mtime);
 164         to->di_ctime = xfs_log_dinode_to_disk_ts(from, from->di_ctime);
 165
 166         to->di_size = cpu_to_be64(from->di_size);
 167         to->di_nblocks = cpu_to_be64(from->di_nblocks);
 168         to->di_extsize = cpu_to_be32(from->di_extsize);
 169         to->di_nextents = cpu_to_be32(from->di_nextents);
 170         to->di_anextents = cpu_to_be16(from->di_anextents);
 171         to->di_forkoff = from->di_forkoff;
 172         to->di_aformat = from->di_aformat;
 173         to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
 174         to->di_dmstate = cpu_to_be16(from->di_dmstate);
 175         to->di_flags = cpu_to_be16(from->di_flags);
 176         to->di_gen = cpu_to_be32(from->di_gen);
 177
 178         if (from->di_version == 3) {
 179                 to->di_changecount = cpu_to_be64(from->di_changecount);
 180                 to->di_crtime = xfs_log_dinode_to_disk_ts(from,
 181                                                           from->di_crtime);
 182                 to->di_flags2 = cpu_to_be64(from->di_flags2);
 183                 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
 184                 to->di_ino = cpu_to_be64(from->di_ino);
 185                 to->di_lsn = cpu_to_be64(from->di_lsn);
 186                 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
 187                 uuid_copy(&to->di_uuid, &from->di_uuid);
 188                 to->di_flushiter = 0;
 189         } else {
 190                 to->di_flushiter = cpu_to_be16(from->di_flushiter);
 191         }
 192 }
 193
 194 STATIC int
 195 xlog_recover_inode_commit_pass2(
 196         struct xlog                     *log,
 197         struct list_head                *buffer_list,
 198         struct xlog_recover_item        *item,
 199         xfs_lsn_t                       current_lsn)
 200 {
 201         struct xfs_inode_log_format     *in_f;
 202         struct xfs_mount                *mp = log->l_mp;
 203         struct xfs_buf                  *bp;
 204         struct xfs_dinode               *dip;
 205         int                             len;
 206         char                            *src;
 207         char                            *dest;
 208         int                             error;
 209         int                             attr_index;
 210         uint                            fields;
 211         struct xfs_log_dinode           *ldip;
 212         uint                            isize;
 213         int                             need_free = 0;
 214
 215         if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
 216                 in_f = item->ri_buf[0].i_addr;
 217         } else {
 218                 in_f = kmem_alloc(sizeof(struct xfs_inode_log_format), 0);
 219                 need_free = 1;
 220                 error = xfs_inode_item_format_convert(&item->ri_buf[0], in_f);
 221                 if (error)
 222                         goto error;
 223         }
 224
 225         /*
 226          * Inode buffers can be freed, look out for it,
 227          * and do not replay the inode.
 228          */
 229         if (xlog_is_buffer_cancelled(log, in_f->ilf_blkno, in_f->ilf_len)) {
 230                 error = 0;
 231                 trace_xfs_log_recover_inode_cancel(log, in_f);
 232                 goto error;
 233         }
 234         trace_xfs_log_recover_inode_recover(log, in_f);
 235
 236         error = xfs_buf_read(mp->m_ddev_targp, in_f->ilf_blkno, in_f->ilf_len,
 237                         0, &bp, &xfs_inode_buf_ops);
 238         if (error)
 239                 goto error;
 240         ASSERT(in_f->ilf_fields & XFS_ILOG_CORE);
 241         dip = xfs_buf_offset(bp, in_f->ilf_boffset);
 242
 243         /*
 244          * Make sure the place we're flushing out to really looks
 245          * like an inode!
 246          */
 247         if (XFS_IS_CORRUPT(mp, !xfs_verify_magic16(bp, dip->di_magic))) {
 248                 xfs_alert(mp,
 249         "%s: Bad inode magic number, dip = "PTR_FMT", dino bp = "PTR_FMT", ino = %Ld",
 250                         __func__, dip, bp, in_f->ilf_ino);
 251                 error = -EFSCORRUPTED;
 252                 goto out_release;
 253         }
 254         ldip = item->ri_buf[1].i_addr;
 255         if (XFS_IS_CORRUPT(mp, ldip->di_magic != XFS_DINODE_MAGIC)) {
 256                 xfs_alert(mp,
 257                         "%s: Bad inode log record, rec ptr "PTR_FMT", ino %Ld",
 258                         __func__, item, in_f->ilf_ino);
 259                 error = -EFSCORRUPTED;
 260                 goto out_release;
 261         }
 262
 263         /*
 264          * If the inode has an LSN in it, recover the inode only if it's less
 265          * than the lsn of the transaction we are replaying. Note: we still
 266          * need to replay an owner change even though the inode is more recent
 267          * than the transaction as there is no guarantee that all the btree
 268          * blocks are more recent than this transaction, too.
 269          */
 270         if (dip->di_version >= 3) {
 271                 xfs_lsn_t       lsn = be64_to_cpu(dip->di_lsn);
 272
 273                 if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) >= 0) {
 274                         trace_xfs_log_recover_inode_skip(log, in_f);
 275                         error = 0;
 276                         goto out_owner_change;
 277                 }
 278         }
 279
 280         /*
 281          * di_flushiter is only valid for v1/2 inodes. All changes for v3 inodes
 282          * are transactional and if ordering is necessary we can determine that
 283          * more accurately by the LSN field in the V3 inode core. Don't trust
 284          * the inode versions we might be changing them here - use the
 285          * superblock flag to determine whether we need to look at di_flushiter
 286          * to skip replay when the on disk inode is newer than the log one
 287          */
 288         if (!xfs_sb_version_has_v3inode(&mp->m_sb) &&
 289             ldip->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
 290                 /*
 291                  * Deal with the wrap case, DI_MAX_FLUSH is less
 292                  * than smaller numbers
 293                  */
 294                 if (be16_to_cpu(dip->di_flushiter) == DI_MAX_FLUSH &&
 295                     ldip->di_flushiter < (DI_MAX_FLUSH >> 1)) {
 296                         /* do nothing */
 297                 } else {
 298                         trace_xfs_log_recover_inode_skip(log, in_f);
 299                         error = 0;
 300                         goto out_release;
 301                 }
 302         }
 303
 304         /* Take the opportunity to reset the flush iteration count */
 305         ldip->di_flushiter = 0;
 306
 307         if (unlikely(S_ISREG(ldip->di_mode))) {
 308                 if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
 309                     (ldip->di_format != XFS_DINODE_FMT_BTREE)) {
 310                         XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(3)",
 311                                          XFS_ERRLEVEL_LOW, mp, ldip,
 312                                          sizeof(*ldip));
 313                         xfs_alert(mp,
 314                 "%s: Bad regular inode log record, rec ptr "PTR_FMT", "
 315                 "ino ptr = "PTR_FMT", ino bp = "PTR_FMT", ino %Ld",
 316                                 __func__, item, dip, bp, in_f->ilf_ino);
 317                         error = -EFSCORRUPTED;
 318                         goto out_release;
 319                 }
 320         } else if (unlikely(S_ISDIR(ldip->di_mode))) {
 321                 if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
 322                     (ldip->di_format != XFS_DINODE_FMT_BTREE) &&
 323                     (ldip->di_format != XFS_DINODE_FMT_LOCAL)) {
 324                         XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(4)",
 325                                              XFS_ERRLEVEL_LOW, mp, ldip,
 326                                              sizeof(*ldip));
 327                         xfs_alert(mp,
 328                 "%s: Bad dir inode log record, rec ptr "PTR_FMT", "
 329                 "ino ptr = "PTR_FMT", ino bp = "PTR_FMT", ino %Ld",
 330                                 __func__, item, dip, bp, in_f->ilf_ino);
 331                         error = -EFSCORRUPTED;
 332                         goto out_release;
 333                 }
 334         }
 335         if (unlikely(ldip->di_nextents + ldip->di_anextents > ldip->di_nblocks)){
 336                 XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(5)",
 337                                      XFS_ERRLEVEL_LOW, mp, ldip,
 338                                      sizeof(*ldip));
 339                 xfs_alert(mp,
 340         "%s: Bad inode log record, rec ptr "PTR_FMT", dino ptr "PTR_FMT", "
 341         "dino bp "PTR_FMT", ino %Ld, total extents = %d, nblocks = %Ld",
 342                         __func__, item, dip, bp, in_f->ilf_ino,
 343                         ldip->di_nextents + ldip->di_anextents,
 344                         ldip->di_nblocks);
 345                 error = -EFSCORRUPTED;
 346                 goto out_release;
 347         }
 348         if (unlikely(ldip->di_forkoff > mp->m_sb.sb_inodesize)) {
 349                 XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(6)",
 350                                      XFS_ERRLEVEL_LOW, mp, ldip,
 351                                      sizeof(*ldip));
 352                 xfs_alert(mp,
 353         "%s: Bad inode log record, rec ptr "PTR_FMT", dino ptr "PTR_FMT", "
 354         "dino bp "PTR_FMT", ino %Ld, forkoff 0x%x", __func__,
 355                         item, dip, bp, in_f->ilf_ino, ldip->di_forkoff);
 356                 error = -EFSCORRUPTED;
 357                 goto out_release;
 358         }
 359         isize = xfs_log_dinode_size(mp);
 360         if (unlikely(item->ri_buf[1].i_len > isize)) {
 361                 XFS_CORRUPTION_ERROR("xlog_recover_inode_pass2(7)",
 362                                      XFS_ERRLEVEL_LOW, mp, ldip,
 363                                      sizeof(*ldip));
 364                 xfs_alert(mp,
 365                         "%s: Bad inode log record length %d, rec ptr "PTR_FMT,
 366                         __func__, item->ri_buf[1].i_len, item);
 367                 error = -EFSCORRUPTED;
 368                 goto out_release;
 369         }
 370
 371         /* recover the log dinode inode into the on disk inode */
 372         xfs_log_dinode_to_disk(ldip, dip);
 373
 374         fields = in_f->ilf_fields;
 375         if (fields & XFS_ILOG_DEV)
 376                 xfs_dinode_put_rdev(dip, in_f->ilf_u.ilfu_rdev);
 377
 378         if (in_f->ilf_size == 2)
 379                 goto out_owner_change;
 380         len = item->ri_buf[2].i_len;
 381         src = item->ri_buf[2].i_addr;
 382         ASSERT(in_f->ilf_size <= 4);
 383         ASSERT((in_f->ilf_size == 3) || (fields & XFS_ILOG_AFORK));
 384         ASSERT(!(fields & XFS_ILOG_DFORK) ||
 385                (len == in_f->ilf_dsize));
 386
 387         switch (fields & XFS_ILOG_DFORK) {
 388         case XFS_ILOG_DDATA:
 389         case XFS_ILOG_DEXT:
 390                 memcpy(XFS_DFORK_DPTR(dip), src, len);
 391                 break;
 392
 393         case XFS_ILOG_DBROOT:
 394                 xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src, len,
 395                                  (struct xfs_bmdr_block *)XFS_DFORK_DPTR(dip),
 396                                  XFS_DFORK_DSIZE(dip, mp));
 397                 break;
 398
 399         default:
 400                 /*
 401                  * There are no data fork flags set.
 402                  */
 403                 ASSERT((fields & XFS_ILOG_DFORK) == 0);
 404                 break;
 405         }
 406
 407         /*
 408          * If we logged any attribute data, recover it.  There may or
 409          * may not have been any other non-core data logged in this
 410          * transaction.
 411          */
 412         if (in_f->ilf_fields & XFS_ILOG_AFORK) {
 413                 if (in_f->ilf_fields & XFS_ILOG_DFORK) {
 414                         attr_index = 3;
 415                 } else {
 416                         attr_index = 2;
 417                 }
 418                 len = item->ri_buf[attr_index].i_len;
 419                 src = item->ri_buf[attr_index].i_addr;
 420                 ASSERT(len == in_f->ilf_asize);
 421
 422                 switch (in_f->ilf_fields & XFS_ILOG_AFORK) {
 423                 case XFS_ILOG_ADATA:
 424                 case XFS_ILOG_AEXT:
 425                         dest = XFS_DFORK_APTR(dip);
 426                         ASSERT(len <= XFS_DFORK_ASIZE(dip, mp));
 427                         memcpy(dest, src, len);
 428                         break;
 429
 430                 case XFS_ILOG_ABROOT:
 431                         dest = XFS_DFORK_APTR(dip);
 432                         xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src,
 433                                          len, (struct xfs_bmdr_block *)dest,
 434                                          XFS_DFORK_ASIZE(dip, mp));
 435                         break;
 436
 437                 default:
 438                         xfs_warn(log->l_mp, "%s: Invalid flag", __func__);
 439                         ASSERT(0);
 440                         error = -EFSCORRUPTED;
 441                         goto out_release;
 442                 }
 443         }
 444
 445 out_owner_change:
 446         /* Recover the swapext owner change unless inode has been deleted */
 447         if ((in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER)) &&
 448             (dip->di_mode != 0))
 449                 error = xfs_recover_inode_owner_change(mp, dip, in_f,
 450                                                        buffer_list);
 451         /* re-generate the checksum. */
 452         xfs_dinode_calc_crc(log->l_mp, dip);
 453
 454         ASSERT(bp->b_mount == mp);
 455         bp->b_flags |= _XBF_LOGRECOVERY;
 456         xfs_buf_delwri_queue(bp, buffer_list);
 457
 458 out_release:
 459         xfs_buf_relse(bp);
 460 error:
 461         if (need_free)
 462                 kmem_free(in_f);
 463         return error;
 464 }
 465
 466 const struct xlog_recover_item_ops xlog_inode_item_ops = {
 467         .item_type              = XFS_LI_INODE,
 468         .ra_pass2               = xlog_recover_inode_ra_pass2,
 469         .commit_pass2           = xlog_recover_inode_commit_pass2,
 470 };