fs/ubifs/journal.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file is part of UBIFS.
   4  *
   5  * Copyright (C) 2006-2008 Nokia Corporation.
   6  *
   7  * Authors: Artem Bityutskiy (Битюцкий Артём)
   8  *          Adrian Hunter
   9  */
  10
  11 /*
  12  * This file implements UBIFS journal.
  13  *
  14  * The journal consists of 2 parts - the log and bud LEBs. The log has fixed
  15  * length and position, while a bud logical eraseblock is any LEB in the main
  16  * area. Buds contain file system data - data nodes, inode nodes, etc. The log
  17  * contains only references to buds and some other stuff like commit
  18  * start node. The idea is that when we commit the journal, we do
  19  * not copy the data, the buds just become indexed. Since after the commit the
  20  * nodes in bud eraseblocks become leaf nodes of the file system index tree, we
  21  * use term "bud". Analogy is obvious, bud eraseblocks contain nodes which will
  22  * become leafs in the future.
  23  *
  24  * The journal is multi-headed because we want to write data to the journal as
  25  * optimally as possible. It is nice to have nodes belonging to the same inode
  26  * in one LEB, so we may write data owned by different inodes to different
  27  * journal heads, although at present only one data head is used.
  28  *
  29  * For recovery reasons, the base head contains all inode nodes, all directory
  30  * entry nodes and all truncate nodes. This means that the other heads contain
  31  * only data nodes.
  32  *
  33  * Bud LEBs may be half-indexed. For example, if the bud was not full at the
  34  * time of commit, the bud is retained to continue to be used in the journal,
  35  * even though the "front" of the LEB is now indexed. In that case, the log
  36  * reference contains the offset where the bud starts for the purposes of the
  37  * journal.
  38  *
  39  * The journal size has to be limited, because the larger is the journal, the
  40  * longer it takes to mount UBIFS (scanning the journal) and the more memory it
  41  * takes (indexing in the TNC).
  42  *
  43  * All the journal write operations like 'ubifs_jnl_update()' here, which write
  44  * multiple UBIFS nodes to the journal at one go, are atomic with respect to
  45  * unclean reboots. Should the unclean reboot happen, the recovery code drops
  46  * all the nodes.
  47  */
  48
  49 #include "ubifs.h"
  50
  51 /**
  52  * zero_ino_node_unused - zero out unused fields of an on-flash inode node.
  53  * @ino: the inode to zero out
  54  */
  55 static inline void zero_ino_node_unused(struct ubifs_ino_node *ino)
  56 {
  57         memset(ino->padding1, 0, 4);
  58         memset(ino->padding2, 0, 26);
  59 }
  60
  61 /**
  62  * zero_dent_node_unused - zero out unused fields of an on-flash directory
  63  *                         entry node.
  64  * @dent: the directory entry to zero out
  65  */
  66 static inline void zero_dent_node_unused(struct ubifs_dent_node *dent)
  67 {
  68         dent->padding1 = 0;
  69 }
  70
  71 /**
  72  * zero_trun_node_unused - zero out unused fields of an on-flash truncation
  73  *                         node.
  74  * @trun: the truncation node to zero out
  75  */
  76 static inline void zero_trun_node_unused(struct ubifs_trun_node *trun)
  77 {
  78         memset(trun->padding, 0, 12);
  79 }
  80
  81 static void ubifs_add_auth_dirt(struct ubifs_info *c, int lnum)
  82 {
  83         if (ubifs_authenticated(c))
  84                 ubifs_add_dirt(c, lnum, ubifs_auth_node_sz(c));
  85 }
  86
  87 /**
  88  * reserve_space - reserve space in the journal.
  89  * @c: UBIFS file-system description object
  90  * @jhead: journal head number
  91  * @len: node length
  92  *
  93  * This function reserves space in journal head @head. If the reservation
  94  * succeeded, the journal head stays locked and later has to be unlocked using
  95  * 'release_head()'. Returns zero in case of success, %-EAGAIN if commit has to
  96  * be done, and other negative error codes in case of other failures.
  97  */
  98 static int reserve_space(struct ubifs_info *c, int jhead, int len)
  99 {
 100         int err = 0, err1, retries = 0, avail, lnum, offs, squeeze;
 101         struct ubifs_wbuf *wbuf = &c->jheads[jhead].wbuf;
 102
 103         /*
 104          * Typically, the base head has smaller nodes written to it, so it is
 105          * better to try to allocate space at the ends of eraseblocks. This is
 106          * what the squeeze parameter does.
 107          */
 108         ubifs_assert(c, !c->ro_media && !c->ro_mount);
 109         squeeze = (jhead == BASEHD);
 110 again:
 111         mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
 112
 113         if (c->ro_error) {
 114                 err = -EROFS;
 115                 goto out_unlock;
 116         }
 117
 118         avail = c->leb_size - wbuf->offs - wbuf->used;
 119         if (wbuf->lnum != -1 && avail >= len)
 120                 return 0;
 121
 122         /*
 123          * Write buffer wasn't seek'ed or there is no enough space - look for an
 124          * LEB with some empty space.
 125          */
 126         lnum = ubifs_find_free_space(c, len, &offs, squeeze);
 127         if (lnum >= 0)
 128                 goto out;
 129
 130         err = lnum;
 131         if (err != -ENOSPC)
 132                 goto out_unlock;
 133
 134         /*
 135          * No free space, we have to run garbage collector to make
 136          * some. But the write-buffer mutex has to be unlocked because
 137          * GC also takes it.
 138          */
 139         dbg_jnl("no free space in jhead %s, run GC", dbg_jhead(jhead));
 140         mutex_unlock(&wbuf->io_mutex);
 141
 142         lnum = ubifs_garbage_collect(c, 0);
 143         if (lnum < 0) {
 144                 err = lnum;
 145                 if (err != -ENOSPC)
 146                         return err;
 147
 148                 /*
 149                  * GC could not make a free LEB. But someone else may
 150                  * have allocated new bud for this journal head,
 151                  * because we dropped @wbuf->io_mutex, so try once
 152                  * again.
 153                  */
 154                 dbg_jnl("GC couldn't make a free LEB for jhead %s",
 155                         dbg_jhead(jhead));
 156                 if (retries++ < 2) {
 157                         dbg_jnl("retry (%d)", retries);
 158                         goto again;
 159                 }
 160
 161                 dbg_jnl("return -ENOSPC");
 162                 return err;
 163         }
 164
 165         mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
 166         dbg_jnl("got LEB %d for jhead %s", lnum, dbg_jhead(jhead));
 167         avail = c->leb_size - wbuf->offs - wbuf->used;
 168
 169         if (wbuf->lnum != -1 && avail >= len) {
 170                 /*
 171                  * Someone else has switched the journal head and we have
 172                  * enough space now. This happens when more than one process is
 173                  * trying to write to the same journal head at the same time.
 174                  */
 175                 dbg_jnl("return LEB %d back, already have LEB %d:%d",
 176                         lnum, wbuf->lnum, wbuf->offs + wbuf->used);
 177                 err = ubifs_return_leb(c, lnum);
 178                 if (err)
 179                         goto out_unlock;
 180                 return 0;
 181         }
 182
 183         offs = 0;
 184
 185 out:
 186         /*
 187          * Make sure we synchronize the write-buffer before we add the new bud
 188          * to the log. Otherwise we may have a power cut after the log
 189          * reference node for the last bud (@lnum) is written but before the
 190          * write-buffer data are written to the next-to-last bud
 191          * (@wbuf->lnum). And the effect would be that the recovery would see
 192          * that there is corruption in the next-to-last bud.
 193          */
 194         err = ubifs_wbuf_sync_nolock(wbuf);
 195         if (err)
 196                 goto out_return;
 197         err = ubifs_add_bud_to_log(c, jhead, lnum, offs);
 198         if (err)
 199                 goto out_return;
 200         err = ubifs_wbuf_seek_nolock(wbuf, lnum, offs);
 201         if (err)
 202                 goto out_unlock;
 203
 204         return 0;
 205
 206 out_unlock:
 207         mutex_unlock(&wbuf->io_mutex);
 208         return err;
 209
 210 out_return:
 211         /* An error occurred and the LEB has to be returned to lprops */
 212         ubifs_assert(c, err < 0);
 213         err1 = ubifs_return_leb(c, lnum);
 214         if (err1 && err == -EAGAIN)
 215                 /*
 216                  * Return original error code only if it is not %-EAGAIN,
 217                  * which is not really an error. Otherwise, return the error
 218                  * code of 'ubifs_return_leb()'.
 219                  */
 220                 err = err1;
 221         mutex_unlock(&wbuf->io_mutex);
 222         return err;
 223 }
 224
 225 static int ubifs_hash_nodes(struct ubifs_info *c, void *node,
 226                              int len, struct shash_desc *hash)
 227 {
 228         int auth_node_size = ubifs_auth_node_sz(c);
 229         int err;
 230
 231         while (1) {
 232                 const struct ubifs_ch *ch = node;
 233                 int nodelen = le32_to_cpu(ch->len);
 234
 235                 ubifs_assert(c, len >= auth_node_size);
 236
 237                 if (len == auth_node_size)
 238                         break;
 239
 240                 ubifs_assert(c, len > nodelen);
 241                 ubifs_assert(c, ch->magic == cpu_to_le32(UBIFS_NODE_MAGIC));
 242
 243                 err = ubifs_shash_update(c, hash, (void *)node, nodelen);
 244                 if (err)
 245                         return err;
 246
 247                 node += ALIGN(nodelen, 8);
 248                 len -= ALIGN(nodelen, 8);
 249         }
 250
 251         return ubifs_prepare_auth_node(c, node, hash);
 252 }
 253
 254 /**
 255  * write_head - write data to a journal head.
 256  * @c: UBIFS file-system description object
 257  * @jhead: journal head
 258  * @buf: buffer to write
 259  * @len: length to write
 260  * @lnum: LEB number written is returned here
 261  * @offs: offset written is returned here
 262  * @sync: non-zero if the write-buffer has to by synchronized
 263  *
 264  * This function writes data to the reserved space of journal head @jhead.
 265  * Returns zero in case of success and a negative error code in case of
 266  * failure.
 267  */
 268 static int write_head(struct ubifs_info *c, int jhead, void *buf, int len,
 269                       int *lnum, int *offs, int sync)
 270 {
 271         int err;
 272         struct ubifs_wbuf *wbuf = &c->jheads[jhead].wbuf;
 273
 274         ubifs_assert(c, jhead != GCHD);
 275
 276         *lnum = c->jheads[jhead].wbuf.lnum;
 277         *offs = c->jheads[jhead].wbuf.offs + c->jheads[jhead].wbuf.used;
 278         dbg_jnl("jhead %s, LEB %d:%d, len %d",
 279                 dbg_jhead(jhead), *lnum, *offs, len);
 280
 281         if (ubifs_authenticated(c)) {
 282                 err = ubifs_hash_nodes(c, buf, len, c->jheads[jhead].log_hash);
 283                 if (err)
 284                         return err;
 285         }
 286
 287         err = ubifs_wbuf_write_nolock(wbuf, buf, len);
 288         if (err)
 289                 return err;
 290         if (sync)
 291                 err = ubifs_wbuf_sync_nolock(wbuf);
 292         return err;
 293 }
 294
 295 /**
 296  * make_reservation - reserve journal space.
 297  * @c: UBIFS file-system description object
 298  * @jhead: journal head
 299  * @len: how many bytes to reserve
 300  *
 301  * This function makes space reservation in journal head @jhead. The function
 302  * takes the commit lock and locks the journal head, and the caller has to
 303  * unlock the head and finish the reservation with 'finish_reservation()'.
 304  * Returns zero in case of success and a negative error code in case of
 305  * failure.
 306  *
 307  * Note, the journal head may be unlocked as soon as the data is written, while
 308  * the commit lock has to be released after the data has been added to the
 309  * TNC.
 310  */
 311 static int make_reservation(struct ubifs_info *c, int jhead, int len)
 312 {
 313         int err, cmt_retries = 0, nospc_retries = 0;
 314
 315 again:
 316         down_read(&c->commit_sem);
 317         err = reserve_space(c, jhead, len);
 318         if (!err)
 319                 /* c->commit_sem will get released via finish_reservation(). */
 320                 return 0;
 321         up_read(&c->commit_sem);
 322
 323         if (err == -ENOSPC) {
 324                 /*
 325                  * GC could not make any progress. We should try to commit
 326                  * once because it could make some dirty space and GC would
 327                  * make progress, so make the error -EAGAIN so that the below
 328                  * will commit and re-try.
 329                  */
 330                 if (nospc_retries++ < 2) {
 331                         dbg_jnl("no space, retry");
 332                         err = -EAGAIN;
 333                 }
 334
 335                 /*
 336                  * This means that the budgeting is incorrect. We always have
 337                  * to be able to write to the media, because all operations are
 338                  * budgeted. Deletions are not budgeted, though, but we reserve
 339                  * an extra LEB for them.
 340                  */
 341         }
 342
 343         if (err != -EAGAIN)
 344                 goto out;
 345
 346         /*
 347          * -EAGAIN means that the journal is full or too large, or the above
 348          * code wants to do one commit. Do this and re-try.
 349          */
 350         if (cmt_retries > 128) {
 351                 /*
 352                  * This should not happen unless the journal size limitations
 353                  * are too tough.
 354                  */
 355                 ubifs_err(c, "stuck in space allocation");
 356                 err = -ENOSPC;
 357                 goto out;
 358         } else if (cmt_retries > 32)
 359                 ubifs_warn(c, "too many space allocation re-tries (%d)",
 360                            cmt_retries);
 361
 362         dbg_jnl("-EAGAIN, commit and retry (retried %d times)",
 363                 cmt_retries);
 364         cmt_retries += 1;
 365
 366         err = ubifs_run_commit(c);
 367         if (err)
 368                 return err;
 369         goto again;
 370
 371 out:
 372         ubifs_err(c, "cannot reserve %d bytes in jhead %d, error %d",
 373                   len, jhead, err);
 374         if (err == -ENOSPC) {
 375                 /* This are some budgeting problems, print useful information */
 376                 down_write(&c->commit_sem);
 377                 dump_stack();
 378                 ubifs_dump_budg(c, &c->bi);
 379                 ubifs_dump_lprops(c);
 380                 cmt_retries = dbg_check_lprops(c);
 381                 up_write(&c->commit_sem);
 382         }
 383         return err;
 384 }
 385
 386 /**
 387  * release_head - release a journal head.
 388  * @c: UBIFS file-system description object
 389  * @jhead: journal head
 390  *
 391  * This function releases journal head @jhead which was locked by
 392  * the 'make_reservation()' function. It has to be called after each successful
 393  * 'make_reservation()' invocation.
 394  */
 395 static inline void release_head(struct ubifs_info *c, int jhead)
 396 {
 397         mutex_unlock(&c->jheads[jhead].wbuf.io_mutex);
 398 }
 399
 400 /**
 401  * finish_reservation - finish a reservation.
 402  * @c: UBIFS file-system description object
 403  *
 404  * This function finishes journal space reservation. It must be called after
 405  * 'make_reservation()'.
 406  */
 407 static void finish_reservation(struct ubifs_info *c)
 408 {
 409         up_read(&c->commit_sem);
 410 }
 411
 412 /**
 413  * get_dent_type - translate VFS inode mode to UBIFS directory entry type.
 414  * @mode: inode mode
 415  */
 416 static int get_dent_type(int mode)
 417 {
 418         switch (mode & S_IFMT) {
 419         case S_IFREG:
 420                 return UBIFS_ITYPE_REG;
 421         case S_IFDIR:
 422                 return UBIFS_ITYPE_DIR;
 423         case S_IFLNK:
 424                 return UBIFS_ITYPE_LNK;
 425         case S_IFBLK:
 426                 return UBIFS_ITYPE_BLK;
 427         case S_IFCHR:
 428                 return UBIFS_ITYPE_CHR;
 429         case S_IFIFO:
 430                 return UBIFS_ITYPE_FIFO;
 431         case S_IFSOCK:
 432                 return UBIFS_ITYPE_SOCK;
 433         default:
 434                 BUG();
 435         }
 436         return 0;
 437 }
 438
 439 /**
 440  * pack_inode - pack an inode node.
 441  * @c: UBIFS file-system description object
 442  * @ino: buffer in which to pack inode node
 443  * @inode: inode to pack
 444  * @last: indicates the last node of the group
 445  */
 446 static void pack_inode(struct ubifs_info *c, struct ubifs_ino_node *ino,
 447                        const struct inode *inode, int last)
 448 {
 449         int data_len = 0, last_reference = !inode->i_nlink;
 450         struct ubifs_inode *ui = ubifs_inode(inode);
 451
 452         ino->ch.node_type = UBIFS_INO_NODE;
 453         ino_key_init_flash(c, &ino->key, inode->i_ino);
 454         ino->creat_sqnum = cpu_to_le64(ui->creat_sqnum);
 455         ino->atime_sec  = cpu_to_le64(inode->i_atime.tv_sec);
 456         ino->atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
 457         ino->ctime_sec  = cpu_to_le64(inode->i_ctime.tv_sec);
 458         ino->ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 459         ino->mtime_sec  = cpu_to_le64(inode->i_mtime.tv_sec);
 460         ino->mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 461         ino->uid   = cpu_to_le32(i_uid_read(inode));
 462         ino->gid   = cpu_to_le32(i_gid_read(inode));
 463         ino->mode  = cpu_to_le32(inode->i_mode);
 464         ino->flags = cpu_to_le32(ui->flags);
 465         ino->size  = cpu_to_le64(ui->ui_size);
 466         ino->nlink = cpu_to_le32(inode->i_nlink);
 467         ino->compr_type  = cpu_to_le16(ui->compr_type);
 468         ino->data_len    = cpu_to_le32(ui->data_len);
 469         ino->xattr_cnt   = cpu_to_le32(ui->xattr_cnt);
 470         ino->xattr_size  = cpu_to_le32(ui->xattr_size);
 471         ino->xattr_names = cpu_to_le32(ui->xattr_names);
 472         zero_ino_node_unused(ino);
 473
 474         /*
 475          * Drop the attached data if this is a deletion inode, the data is not
 476          * needed anymore.
 477          */
 478         if (!last_reference) {
 479                 memcpy(ino->data, ui->data, ui->data_len);
 480                 data_len = ui->data_len;
 481         }
 482
 483         ubifs_prep_grp_node(c, ino, UBIFS_INO_NODE_SZ + data_len, last);
 484 }
 485
 486 /**
 487  * mark_inode_clean - mark UBIFS inode as clean.
 488  * @c: UBIFS file-system description object
 489  * @ui: UBIFS inode to mark as clean
 490  *
 491  * This helper function marks UBIFS inode @ui as clean by cleaning the
 492  * @ui->dirty flag and releasing its budget. Note, VFS may still treat the
 493  * inode as dirty and try to write it back, but 'ubifs_write_inode()' would
 494  * just do nothing.
 495  */
 496 static void mark_inode_clean(struct ubifs_info *c, struct ubifs_inode *ui)
 497 {
 498         if (ui->dirty)
 499                 ubifs_release_dirty_inode_budget(c, ui);
 500         ui->dirty = 0;
 501 }
 502
 503 static void set_dent_cookie(struct ubifs_info *c, struct ubifs_dent_node *dent)
 504 {
 505         if (c->double_hash)
 506                 dent->cookie = (__force __le32) prandom_u32();
 507         else
 508                 dent->cookie = 0;
 509 }
 510
 511 /**
 512  * ubifs_jnl_update - update inode.
 513  * @c: UBIFS file-system description object
 514  * @dir: parent inode or host inode in case of extended attributes
 515  * @nm: directory entry name
 516  * @inode: inode to update
 517  * @deletion: indicates a directory entry deletion i.e unlink or rmdir
 518  * @xent: non-zero if the directory entry is an extended attribute entry
 519  *
 520  * This function updates an inode by writing a directory entry (or extended
 521  * attribute entry), the inode itself, and the parent directory inode (or the
 522  * host inode) to the journal.
 523  *
 524  * The function writes the host inode @dir last, which is important in case of
 525  * extended attributes. Indeed, then we guarantee that if the host inode gets
 526  * synchronized (with 'fsync()'), and the write-buffer it sits in gets flushed,
 527  * the extended attribute inode gets flushed too. And this is exactly what the
 528  * user expects - synchronizing the host inode synchronizes its extended
 529  * attributes. Similarly, this guarantees that if @dir is synchronized, its
 530  * directory entry corresponding to @nm gets synchronized too.
 531  *
 532  * If the inode (@inode) or the parent directory (@dir) are synchronous, this
 533  * function synchronizes the write-buffer.
 534  *
 535  * This function marks the @dir and @inode inodes as clean and returns zero on
 536  * success. In case of failure, a negative error code is returned.
 537  */
 538 int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
 539                      const struct fscrypt_name *nm, const struct inode *inode,
 540                      int deletion, int xent)
 541 {
 542         int err, dlen, ilen, len, lnum, ino_offs, dent_offs;
 543         int aligned_dlen, aligned_ilen, sync = IS_DIRSYNC(dir);
 544         int last_reference = !!(deletion && inode->i_nlink == 0);
 545         struct ubifs_inode *ui = ubifs_inode(inode);
 546         struct ubifs_inode *host_ui = ubifs_inode(dir);
 547         struct ubifs_dent_node *dent;
 548         struct ubifs_ino_node *ino;
 549         union ubifs_key dent_key, ino_key;
 550         u8 hash_dent[UBIFS_HASH_ARR_SZ];
 551         u8 hash_ino[UBIFS_HASH_ARR_SZ];
 552         u8 hash_ino_host[UBIFS_HASH_ARR_SZ];
 553
 554         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
 555
 556         dlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1;
 557         ilen = UBIFS_INO_NODE_SZ;
 558
 559         /*
 560          * If the last reference to the inode is being deleted, then there is
 561          * no need to attach and write inode data, it is being deleted anyway.
 562          * And if the inode is being deleted, no need to synchronize
 563          * write-buffer even if the inode is synchronous.
 564          */
 565         if (!last_reference) {
 566                 ilen += ui->data_len;
 567                 sync |= IS_SYNC(inode);
 568         }
 569
 570         aligned_dlen = ALIGN(dlen, 8);
 571         aligned_ilen = ALIGN(ilen, 8);
 572
 573         len = aligned_dlen + aligned_ilen + UBIFS_INO_NODE_SZ;
 574         /* Make sure to also account for extended attributes */
 575         if (ubifs_authenticated(c))
 576                 len += ALIGN(host_ui->data_len, 8) + ubifs_auth_node_sz(c);
 577         else
 578                 len += host_ui->data_len;
 579
 580         dent = kzalloc(len, GFP_NOFS);
 581         if (!dent)
 582                 return -ENOMEM;
 583
 584         /* Make reservation before allocating sequence numbers */
 585         err = make_reservation(c, BASEHD, len);
 586         if (err)
 587                 goto out_free;
 588
 589         if (!xent) {
 590                 dent->ch.node_type = UBIFS_DENT_NODE;
 591                 if (fname_name(nm) == NULL)
 592                         dent_key_init_hash(c, &dent_key, dir->i_ino, nm->hash);
 593                 else
 594                         dent_key_init(c, &dent_key, dir->i_ino, nm);
 595         } else {
 596                 dent->ch.node_type = UBIFS_XENT_NODE;
 597                 xent_key_init(c, &dent_key, dir->i_ino, nm);
 598         }
 599
 600         key_write(c, &dent_key, dent->key);
 601         dent->inum = deletion ? 0 : cpu_to_le64(inode->i_ino);
 602         dent->type = get_dent_type(inode->i_mode);
 603         dent->nlen = cpu_to_le16(fname_len(nm));
 604         memcpy(dent->name, fname_name(nm), fname_len(nm));
 605         dent->name[fname_len(nm)] = '\0';
 606         set_dent_cookie(c, dent);
 607
 608         zero_dent_node_unused(dent);
 609         ubifs_prep_grp_node(c, dent, dlen, 0);
 610         err = ubifs_node_calc_hash(c, dent, hash_dent);
 611         if (err)
 612                 goto out_release;
 613
 614         ino = (void *)dent + aligned_dlen;
 615         pack_inode(c, ino, inode, 0);
 616         err = ubifs_node_calc_hash(c, ino, hash_ino);
 617         if (err)
 618                 goto out_release;
 619
 620         ino = (void *)ino + aligned_ilen;
 621         pack_inode(c, ino, dir, 1);
 622         err = ubifs_node_calc_hash(c, ino, hash_ino_host);
 623         if (err)
 624                 goto out_release;
 625
 626         if (last_reference) {
 627                 err = ubifs_add_orphan(c, inode->i_ino);
 628                 if (err) {
 629                         release_head(c, BASEHD);
 630                         goto out_finish;
 631                 }
 632                 ui->del_cmtno = c->cmt_no;
 633         }
 634
 635         err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, sync);
 636         if (err)
 637                 goto out_release;
 638         if (!sync) {
 639                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
 640
 641                 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
 642                 ubifs_wbuf_add_ino_nolock(wbuf, dir->i_ino);
 643         }
 644         release_head(c, BASEHD);
 645         kfree(dent);
 646         ubifs_add_auth_dirt(c, lnum);
 647
 648         if (deletion) {
 649                 if (fname_name(nm) == NULL)
 650                         err = ubifs_tnc_remove_dh(c, &dent_key, nm->minor_hash);
 651                 else
 652                         err = ubifs_tnc_remove_nm(c, &dent_key, nm);
 653                 if (err)
 654                         goto out_ro;
 655                 err = ubifs_add_dirt(c, lnum, dlen);
 656         } else
 657                 err = ubifs_tnc_add_nm(c, &dent_key, lnum, dent_offs, dlen,
 658                                        hash_dent, nm);
 659         if (err)
 660                 goto out_ro;
 661
 662         /*
 663          * Note, we do not remove the inode from TNC even if the last reference
 664          * to it has just been deleted, because the inode may still be opened.
 665          * Instead, the inode has been added to orphan lists and the orphan
 666          * subsystem will take further care about it.
 667          */
 668         ino_key_init(c, &ino_key, inode->i_ino);
 669         ino_offs = dent_offs + aligned_dlen;
 670         err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, ilen, hash_ino);
 671         if (err)
 672                 goto out_ro;
 673
 674         ino_key_init(c, &ino_key, dir->i_ino);
 675         ino_offs += aligned_ilen;
 676         err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs,
 677                             UBIFS_INO_NODE_SZ + host_ui->data_len, hash_ino_host);
 678         if (err)
 679                 goto out_ro;
 680
 681         finish_reservation(c);
 682         spin_lock(&ui->ui_lock);
 683         ui->synced_i_size = ui->ui_size;
 684         spin_unlock(&ui->ui_lock);
 685         if (xent) {
 686                 spin_lock(&host_ui->ui_lock);
 687                 host_ui->synced_i_size = host_ui->ui_size;
 688                 spin_unlock(&host_ui->ui_lock);
 689         }
 690         mark_inode_clean(c, ui);
 691         mark_inode_clean(c, host_ui);
 692         return 0;
 693
 694 out_finish:
 695         finish_reservation(c);
 696 out_free:
 697         kfree(dent);
 698         return err;
 699
 700 out_release:
 701         release_head(c, BASEHD);
 702         kfree(dent);
 703 out_ro:
 704         ubifs_ro_mode(c, err);
 705         if (last_reference)
 706                 ubifs_delete_orphan(c, inode->i_ino);
 707         finish_reservation(c);
 708         return err;
 709 }
 710
 711 /**
 712  * ubifs_jnl_write_data - write a data node to the journal.
 713  * @c: UBIFS file-system description object
 714  * @inode: inode the data node belongs to
 715  * @key: node key
 716  * @buf: buffer to write
 717  * @len: data length (must not exceed %UBIFS_BLOCK_SIZE)
 718  *
 719  * This function writes a data node to the journal. Returns %0 if the data node
 720  * was successfully written, and a negative error code in case of failure.
 721  */
 722 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
 723                          const union ubifs_key *key, const void *buf, int len)
 724 {
 725         struct ubifs_data_node *data;
 726         int err, lnum, offs, compr_type, out_len, compr_len, auth_len;
 727         int dlen = COMPRESSED_DATA_NODE_BUF_SZ, allocated = 1;
 728         int write_len;
 729         struct ubifs_inode *ui = ubifs_inode(inode);
 730         bool encrypted = IS_ENCRYPTED(inode);
 731         u8 hash[UBIFS_HASH_ARR_SZ];
 732
 733         dbg_jnlk(key, "ino %lu, blk %u, len %d, key ",
 734                 (unsigned long)key_inum(c, key), key_block(c, key), len);
 735         ubifs_assert(c, len <= UBIFS_BLOCK_SIZE);
 736
 737         if (encrypted)
 738                 dlen += UBIFS_CIPHER_BLOCK_SIZE;
 739
 740         auth_len = ubifs_auth_node_sz(c);
 741
 742         data = kmalloc(dlen + auth_len, GFP_NOFS | __GFP_NOWARN);
 743         if (!data) {
 744                 /*
 745                  * Fall-back to the write reserve buffer. Note, we might be
 746                  * currently on the memory reclaim path, when the kernel is
 747                  * trying to free some memory by writing out dirty pages. The
 748                  * write reserve buffer helps us to guarantee that we are
 749                  * always able to write the data.
 750                  */
 751                 allocated = 0;
 752                 mutex_lock(&c->write_reserve_mutex);
 753                 data = c->write_reserve_buf;
 754         }
 755
 756         data->ch.node_type = UBIFS_DATA_NODE;
 757         key_write(c, key, &data->key);
 758         data->size = cpu_to_le32(len);
 759
 760         if (!(ui->flags & UBIFS_COMPR_FL))
 761                 /* Compression is disabled for this inode */
 762                 compr_type = UBIFS_COMPR_NONE;
 763         else
 764                 compr_type = ui->compr_type;
 765
 766         out_len = compr_len = dlen - UBIFS_DATA_NODE_SZ;
 767         ubifs_compress(c, buf, len, &data->data, &compr_len, &compr_type);
 768         ubifs_assert(c, compr_len <= UBIFS_BLOCK_SIZE);
 769
 770         if (encrypted) {
 771                 err = ubifs_encrypt(inode, data, compr_len, &out_len, key_block(c, key));
 772                 if (err)
 773                         goto out_free;
 774
 775         } else {
 776                 data->compr_size = 0;
 777                 out_len = compr_len;
 778         }
 779
 780         dlen = UBIFS_DATA_NODE_SZ + out_len;
 781         if (ubifs_authenticated(c))
 782                 write_len = ALIGN(dlen, 8) + auth_len;
 783         else
 784                 write_len = dlen;
 785
 786         data->compr_type = cpu_to_le16(compr_type);
 787
 788         /* Make reservation before allocating sequence numbers */
 789         err = make_reservation(c, DATAHD, write_len);
 790         if (err)
 791                 goto out_free;
 792
 793         ubifs_prepare_node(c, data, dlen, 0);
 794         err = write_head(c, DATAHD, data, write_len, &lnum, &offs, 0);
 795         if (err)
 796                 goto out_release;
 797
 798         err = ubifs_node_calc_hash(c, data, hash);
 799         if (err)
 800                 goto out_release;
 801
 802         ubifs_wbuf_add_ino_nolock(&c->jheads[DATAHD].wbuf, key_inum(c, key));
 803         release_head(c, DATAHD);
 804
 805         ubifs_add_auth_dirt(c, lnum);
 806
 807         err = ubifs_tnc_add(c, key, lnum, offs, dlen, hash);
 808         if (err)
 809                 goto out_ro;
 810
 811         finish_reservation(c);
 812         if (!allocated)
 813                 mutex_unlock(&c->write_reserve_mutex);
 814         else
 815                 kfree(data);
 816         return 0;
 817
 818 out_release:
 819         release_head(c, DATAHD);
 820 out_ro:
 821         ubifs_ro_mode(c, err);
 822         finish_reservation(c);
 823 out_free:
 824         if (!allocated)
 825                 mutex_unlock(&c->write_reserve_mutex);
 826         else
 827                 kfree(data);
 828         return err;
 829 }
 830
 831 /**
 832  * ubifs_jnl_write_inode - flush inode to the journal.
 833  * @c: UBIFS file-system description object
 834  * @inode: inode to flush
 835  *
 836  * This function writes inode @inode to the journal. If the inode is
 837  * synchronous, it also synchronizes the write-buffer. Returns zero in case of
 838  * success and a negative error code in case of failure.
 839  */
 840 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
 841 {
 842         int err, lnum, offs;
 843         struct ubifs_ino_node *ino, *ino_start;
 844         struct ubifs_inode *ui = ubifs_inode(inode);
 845         int sync = 0, write_len = 0, ilen = UBIFS_INO_NODE_SZ;
 846         int last_reference = !inode->i_nlink;
 847         int kill_xattrs = ui->xattr_cnt && last_reference;
 848         u8 hash[UBIFS_HASH_ARR_SZ];
 849
 850         dbg_jnl("ino %lu, nlink %u", inode->i_ino, inode->i_nlink);
 851
 852         /*
 853          * If the inode is being deleted, do not write the attached data. No
 854          * need to synchronize the write-buffer either.
 855          */
 856         if (!last_reference) {
 857                 ilen += ui->data_len;
 858                 sync = IS_SYNC(inode);
 859         } else if (kill_xattrs) {
 860                 write_len += UBIFS_INO_NODE_SZ * ui->xattr_cnt;
 861         }
 862
 863         if (ubifs_authenticated(c))
 864                 write_len += ALIGN(ilen, 8) + ubifs_auth_node_sz(c);
 865         else
 866                 write_len += ilen;
 867
 868         ino_start = ino = kmalloc(write_len, GFP_NOFS);
 869         if (!ino)
 870                 return -ENOMEM;
 871
 872         /* Make reservation before allocating sequence numbers */
 873         err = make_reservation(c, BASEHD, write_len);
 874         if (err)
 875                 goto out_free;
 876
 877         if (kill_xattrs) {
 878                 union ubifs_key key;
 879                 struct fscrypt_name nm = {0};
 880                 struct inode *xino;
 881                 struct ubifs_dent_node *xent, *pxent = NULL;
 882
 883                 if (ui->xattr_cnt >= ubifs_xattr_max_cnt(c)) {
 884                         ubifs_err(c, "Cannot delete inode, it has too much xattrs!");
 885                         goto out_release;
 886                 }
 887
 888                 lowest_xent_key(c, &key, inode->i_ino);
 889                 while (1) {
 890                         xent = ubifs_tnc_next_ent(c, &key, &nm);
 891                         if (IS_ERR(xent)) {
 892                                 err = PTR_ERR(xent);
 893                                 if (err == -ENOENT)
 894                                         break;
 895
 896                                 goto out_release;
 897                         }
 898
 899                         fname_name(&nm) = xent->name;
 900                         fname_len(&nm) = le16_to_cpu(xent->nlen);
 901
 902                         xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum));
 903                         if (IS_ERR(xino)) {
 904                                 err = PTR_ERR(xino);
 905                                 ubifs_err(c, "dead directory entry '%s', error %d",
 906                                           xent->name, err);
 907                                 ubifs_ro_mode(c, err);
 908                                 kfree(xent);
 909                                 goto out_release;
 910                         }
 911                         ubifs_assert(c, ubifs_inode(xino)->xattr);
 912
 913                         clear_nlink(xino);
 914                         pack_inode(c, ino, xino, 0);
 915                         ino = (void *)ino + UBIFS_INO_NODE_SZ;
 916                         iput(xino);
 917
 918                         kfree(pxent);
 919                         pxent = xent;
 920                         key_read(c, &xent->key, &key);
 921                 }
 922                 kfree(pxent);
 923         }
 924
 925         pack_inode(c, ino, inode, 1);
 926         err = ubifs_node_calc_hash(c, ino, hash);
 927         if (err)
 928                 goto out_release;
 929
 930         err = write_head(c, BASEHD, ino_start, write_len, &lnum, &offs, sync);
 931         if (err)
 932                 goto out_release;
 933         if (!sync)
 934                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
 935                                           inode->i_ino);
 936         release_head(c, BASEHD);
 937
 938         ubifs_add_auth_dirt(c, lnum);
 939
 940         if (last_reference) {
 941                 err = ubifs_tnc_remove_ino(c, inode->i_ino);
 942                 if (err)
 943                         goto out_ro;
 944                 ubifs_delete_orphan(c, inode->i_ino);
 945                 err = ubifs_add_dirt(c, lnum, write_len);
 946         } else {
 947                 union ubifs_key key;
 948
 949                 ino_key_init(c, &key, inode->i_ino);
 950                 err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash);
 951         }
 952         if (err)
 953                 goto out_ro;
 954
 955         finish_reservation(c);
 956         spin_lock(&ui->ui_lock);
 957         ui->synced_i_size = ui->ui_size;
 958         spin_unlock(&ui->ui_lock);
 959         kfree(ino_start);
 960         return 0;
 961
 962 out_release:
 963         release_head(c, BASEHD);
 964 out_ro:
 965         ubifs_ro_mode(c, err);
 966         finish_reservation(c);
 967 out_free:
 968         kfree(ino_start);
 969         return err;
 970 }
 971
 972 /**
 973  * ubifs_jnl_delete_inode - delete an inode.
 974  * @c: UBIFS file-system description object
 975  * @inode: inode to delete
 976  *
 977  * This function deletes inode @inode which includes removing it from orphans,
 978  * deleting it from TNC and, in some cases, writing a deletion inode to the
 979  * journal.
 980  *
 981  * When regular file inodes are unlinked or a directory inode is removed, the
 982  * 'ubifs_jnl_update()' function writes a corresponding deletion inode and
 983  * direntry to the media, and adds the inode to orphans. After this, when the
 984  * last reference to this inode has been dropped, this function is called. In
 985  * general, it has to write one more deletion inode to the media, because if
 986  * a commit happened between 'ubifs_jnl_update()' and
 987  * 'ubifs_jnl_delete_inode()', the deletion inode is not in the journal
 988  * anymore, and in fact it might not be on the flash anymore, because it might
 989  * have been garbage-collected already. And for optimization reasons UBIFS does
 990  * not read the orphan area if it has been unmounted cleanly, so it would have
 991  * no indication in the journal that there is a deleted inode which has to be
 992  * removed from TNC.
 993  *
 994  * However, if there was no commit between 'ubifs_jnl_update()' and
 995  * 'ubifs_jnl_delete_inode()', then there is no need to write the deletion
 996  * inode to the media for the second time. And this is quite a typical case.
 997  *
 998  * This function returns zero in case of success and a negative error code in
 999  * case of failure.
1000  */
1001 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode)
1002 {
1003         int err;
1004         struct ubifs_inode *ui = ubifs_inode(inode);
1005
1006         ubifs_assert(c, inode->i_nlink == 0);
1007
1008         if (ui->xattr_cnt || ui->del_cmtno != c->cmt_no)
1009                 /* A commit happened for sure or inode hosts xattrs */
1010                 return ubifs_jnl_write_inode(c, inode);
1011
1012         down_read(&c->commit_sem);
1013         /*
1014          * Check commit number again, because the first test has been done
1015          * without @c->commit_sem, so a commit might have happened.
1016          */
1017         if (ui->del_cmtno != c->cmt_no) {
1018                 up_read(&c->commit_sem);
1019                 return ubifs_jnl_write_inode(c, inode);
1020         }
1021
1022         err = ubifs_tnc_remove_ino(c, inode->i_ino);
1023         if (err)
1024                 ubifs_ro_mode(c, err);
1025         else
1026                 ubifs_delete_orphan(c, inode->i_ino);
1027         up_read(&c->commit_sem);
1028         return err;
1029 }
1030
1031 /**
1032  * ubifs_jnl_xrename - cross rename two directory entries.
1033  * @c: UBIFS file-system description object
1034  * @fst_dir: parent inode of 1st directory entry to exchange
1035  * @fst_inode: 1st inode to exchange
1036  * @fst_nm: name of 1st inode to exchange
1037  * @snd_dir: parent inode of 2nd directory entry to exchange
1038  * @snd_inode: 2nd inode to exchange
1039  * @snd_nm: name of 2nd inode to exchange
1040  * @sync: non-zero if the write-buffer has to be synchronized
1041  *
1042  * This function implements the cross rename operation which may involve
1043  * writing 2 inodes and 2 directory entries. It marks the written inodes as clean
1044  * and returns zero on success. In case of failure, a negative error code is
1045  * returned.
1046  */
1047 int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
1048                       const struct inode *fst_inode,
1049                       const struct fscrypt_name *fst_nm,
1050                       const struct inode *snd_dir,
1051                       const struct inode *snd_inode,
1052                       const struct fscrypt_name *snd_nm, int sync)
1053 {
1054         union ubifs_key key;
1055         struct ubifs_dent_node *dent1, *dent2;
1056         int err, dlen1, dlen2, lnum, offs, len, plen = UBIFS_INO_NODE_SZ;
1057         int aligned_dlen1, aligned_dlen2;
1058         int twoparents = (fst_dir != snd_dir);
1059         void *p;
1060         u8 hash_dent1[UBIFS_HASH_ARR_SZ];
1061         u8 hash_dent2[UBIFS_HASH_ARR_SZ];
1062         u8 hash_p1[UBIFS_HASH_ARR_SZ];
1063         u8 hash_p2[UBIFS_HASH_ARR_SZ];
1064
1065         ubifs_assert(c, ubifs_inode(fst_dir)->data_len == 0);
1066         ubifs_assert(c, ubifs_inode(snd_dir)->data_len == 0);
1067         ubifs_assert(c, mutex_is_locked(&ubifs_inode(fst_dir)->ui_mutex));
1068         ubifs_assert(c, mutex_is_locked(&ubifs_inode(snd_dir)->ui_mutex));
1069
1070         dlen1 = UBIFS_DENT_NODE_SZ + fname_len(snd_nm) + 1;
1071         dlen2 = UBIFS_DENT_NODE_SZ + fname_len(fst_nm) + 1;
1072         aligned_dlen1 = ALIGN(dlen1, 8);
1073         aligned_dlen2 = ALIGN(dlen2, 8);
1074
1075         len = aligned_dlen1 + aligned_dlen2 + ALIGN(plen, 8);
1076         if (twoparents)
1077                 len += plen;
1078
1079         len += ubifs_auth_node_sz(c);
1080
1081         dent1 = kzalloc(len, GFP_NOFS);
1082         if (!dent1)
1083                 return -ENOMEM;
1084
1085         /* Make reservation before allocating sequence numbers */
1086         err = make_reservation(c, BASEHD, len);
1087         if (err)
1088                 goto out_free;
1089
1090         /* Make new dent for 1st entry */
1091         dent1->ch.node_type = UBIFS_DENT_NODE;
1092         dent_key_init_flash(c, &dent1->key, snd_dir->i_ino, snd_nm);
1093         dent1->inum = cpu_to_le64(fst_inode->i_ino);
1094         dent1->type = get_dent_type(fst_inode->i_mode);
1095         dent1->nlen = cpu_to_le16(fname_len(snd_nm));
1096         memcpy(dent1->name, fname_name(snd_nm), fname_len(snd_nm));
1097         dent1->name[fname_len(snd_nm)] = '\0';
1098         set_dent_cookie(c, dent1);
1099         zero_dent_node_unused(dent1);
1100         ubifs_prep_grp_node(c, dent1, dlen1, 0);
1101         err = ubifs_node_calc_hash(c, dent1, hash_dent1);
1102         if (err)
1103                 goto out_release;
1104
1105         /* Make new dent for 2nd entry */
1106         dent2 = (void *)dent1 + aligned_dlen1;
1107         dent2->ch.node_type = UBIFS_DENT_NODE;
1108         dent_key_init_flash(c, &dent2->key, fst_dir->i_ino, fst_nm);
1109         dent2->inum = cpu_to_le64(snd_inode->i_ino);
1110         dent2->type = get_dent_type(snd_inode->i_mode);
1111         dent2->nlen = cpu_to_le16(fname_len(fst_nm));
1112         memcpy(dent2->name, fname_name(fst_nm), fname_len(fst_nm));
1113         dent2->name[fname_len(fst_nm)] = '\0';
1114         set_dent_cookie(c, dent2);
1115         zero_dent_node_unused(dent2);
1116         ubifs_prep_grp_node(c, dent2, dlen2, 0);
1117         err = ubifs_node_calc_hash(c, dent2, hash_dent2);
1118         if (err)
1119                 goto out_release;
1120
1121         p = (void *)dent2 + aligned_dlen2;
1122         if (!twoparents) {
1123                 pack_inode(c, p, fst_dir, 1);
1124                 err = ubifs_node_calc_hash(c, p, hash_p1);
1125                 if (err)
1126                         goto out_release;
1127         } else {
1128                 pack_inode(c, p, fst_dir, 0);
1129                 err = ubifs_node_calc_hash(c, p, hash_p1);
1130                 if (err)
1131                         goto out_release;
1132                 p += ALIGN(plen, 8);
1133                 pack_inode(c, p, snd_dir, 1);
1134                 err = ubifs_node_calc_hash(c, p, hash_p2);
1135                 if (err)
1136                         goto out_release;
1137         }
1138
1139         err = write_head(c, BASEHD, dent1, len, &lnum, &offs, sync);
1140         if (err)
1141                 goto out_release;
1142         if (!sync) {
1143                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1144
1145                 ubifs_wbuf_add_ino_nolock(wbuf, fst_dir->i_ino);
1146                 ubifs_wbuf_add_ino_nolock(wbuf, snd_dir->i_ino);
1147         }
1148         release_head(c, BASEHD);
1149
1150         ubifs_add_auth_dirt(c, lnum);
1151
1152         dent_key_init(c, &key, snd_dir->i_ino, snd_nm);
1153         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, snd_nm);
1154         if (err)
1155                 goto out_ro;
1156
1157         offs += aligned_dlen1;
1158         dent_key_init(c, &key, fst_dir->i_ino, fst_nm);
1159         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, fst_nm);
1160         if (err)
1161                 goto out_ro;
1162
1163         offs += aligned_dlen2;
1164
1165         ino_key_init(c, &key, fst_dir->i_ino);
1166         err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p1);
1167         if (err)
1168                 goto out_ro;
1169
1170         if (twoparents) {
1171                 offs += ALIGN(plen, 8);
1172                 ino_key_init(c, &key, snd_dir->i_ino);
1173                 err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p2);
1174                 if (err)
1175                         goto out_ro;
1176         }
1177
1178         finish_reservation(c);
1179
1180         mark_inode_clean(c, ubifs_inode(fst_dir));
1181         if (twoparents)
1182                 mark_inode_clean(c, ubifs_inode(snd_dir));
1183         kfree(dent1);
1184         return 0;
1185
1186 out_release:
1187         release_head(c, BASEHD);
1188 out_ro:
1189         ubifs_ro_mode(c, err);
1190         finish_reservation(c);
1191 out_free:
1192         kfree(dent1);
1193         return err;
1194 }
1195
1196 /**
1197  * ubifs_jnl_rename - rename a directory entry.
1198  * @c: UBIFS file-system description object
1199  * @old_dir: parent inode of directory entry to rename
1200  * @old_dentry: directory entry to rename
1201  * @new_dir: parent inode of directory entry to rename
1202  * @new_dentry: new directory entry (or directory entry to replace)
1203  * @sync: non-zero if the write-buffer has to be synchronized
1204  *
1205  * This function implements the re-name operation which may involve writing up
1206  * to 4 inodes and 2 directory entries. It marks the written inodes as clean
1207  * and returns zero on success. In case of failure, a negative error code is
1208  * returned.
1209  */
1210 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
1211                      const struct inode *old_inode,
1212                      const struct fscrypt_name *old_nm,
1213                      const struct inode *new_dir,
1214                      const struct inode *new_inode,
1215                      const struct fscrypt_name *new_nm,
1216                      const struct inode *whiteout, int sync)
1217 {
1218         void *p;
1219         union ubifs_key key;
1220         struct ubifs_dent_node *dent, *dent2;
1221         int err, dlen1, dlen2, ilen, lnum, offs, len;
1222         int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ;
1223         int last_reference = !!(new_inode && new_inode->i_nlink == 0);
1224         int move = (old_dir != new_dir);
1225         struct ubifs_inode *uninitialized_var(new_ui);
1226         u8 hash_old_dir[UBIFS_HASH_ARR_SZ];
1227         u8 hash_new_dir[UBIFS_HASH_ARR_SZ];
1228         u8 hash_new_inode[UBIFS_HASH_ARR_SZ];
1229         u8 hash_dent1[UBIFS_HASH_ARR_SZ];
1230         u8 hash_dent2[UBIFS_HASH_ARR_SZ];
1231
1232         ubifs_assert(c, ubifs_inode(old_dir)->data_len == 0);
1233         ubifs_assert(c, ubifs_inode(new_dir)->data_len == 0);
1234         ubifs_assert(c, mutex_is_locked(&ubifs_inode(old_dir)->ui_mutex));
1235         ubifs_assert(c, mutex_is_locked(&ubifs_inode(new_dir)->ui_mutex));
1236
1237         dlen1 = UBIFS_DENT_NODE_SZ + fname_len(new_nm) + 1;
1238         dlen2 = UBIFS_DENT_NODE_SZ + fname_len(old_nm) + 1;
1239         if (new_inode) {
1240                 new_ui = ubifs_inode(new_inode);
1241                 ubifs_assert(c, mutex_is_locked(&new_ui->ui_mutex));
1242                 ilen = UBIFS_INO_NODE_SZ;
1243                 if (!last_reference)
1244                         ilen += new_ui->data_len;
1245         } else
1246                 ilen = 0;
1247
1248         aligned_dlen1 = ALIGN(dlen1, 8);
1249         aligned_dlen2 = ALIGN(dlen2, 8);
1250         len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + ALIGN(plen, 8);
1251         if (move)
1252                 len += plen;
1253
1254         len += ubifs_auth_node_sz(c);
1255
1256         dent = kzalloc(len, GFP_NOFS);
1257         if (!dent)
1258                 return -ENOMEM;
1259
1260         /* Make reservation before allocating sequence numbers */
1261         err = make_reservation(c, BASEHD, len);
1262         if (err)
1263                 goto out_free;
1264
1265         /* Make new dent */
1266         dent->ch.node_type = UBIFS_DENT_NODE;
1267         dent_key_init_flash(c, &dent->key, new_dir->i_ino, new_nm);
1268         dent->inum = cpu_to_le64(old_inode->i_ino);
1269         dent->type = get_dent_type(old_inode->i_mode);
1270         dent->nlen = cpu_to_le16(fname_len(new_nm));
1271         memcpy(dent->name, fname_name(new_nm), fname_len(new_nm));
1272         dent->name[fname_len(new_nm)] = '\0';
1273         set_dent_cookie(c, dent);
1274         zero_dent_node_unused(dent);
1275         ubifs_prep_grp_node(c, dent, dlen1, 0);
1276         err = ubifs_node_calc_hash(c, dent, hash_dent1);
1277         if (err)
1278                 goto out_release;
1279
1280         dent2 = (void *)dent + aligned_dlen1;
1281         dent2->ch.node_type = UBIFS_DENT_NODE;
1282         dent_key_init_flash(c, &dent2->key, old_dir->i_ino, old_nm);
1283
1284         if (whiteout) {
1285                 dent2->inum = cpu_to_le64(whiteout->i_ino);
1286                 dent2->type = get_dent_type(whiteout->i_mode);
1287         } else {
1288                 /* Make deletion dent */
1289                 dent2->inum = 0;
1290                 dent2->type = DT_UNKNOWN;
1291         }
1292         dent2->nlen = cpu_to_le16(fname_len(old_nm));
1293         memcpy(dent2->name, fname_name(old_nm), fname_len(old_nm));
1294         dent2->name[fname_len(old_nm)] = '\0';
1295         set_dent_cookie(c, dent2);
1296         zero_dent_node_unused(dent2);
1297         ubifs_prep_grp_node(c, dent2, dlen2, 0);
1298         err = ubifs_node_calc_hash(c, dent2, hash_dent2);
1299         if (err)
1300                 goto out_release;
1301
1302         p = (void *)dent2 + aligned_dlen2;
1303         if (new_inode) {
1304                 pack_inode(c, p, new_inode, 0);
1305                 err = ubifs_node_calc_hash(c, p, hash_new_inode);
1306                 if (err)
1307                         goto out_release;
1308
1309                 p += ALIGN(ilen, 8);
1310         }
1311
1312         if (!move) {
1313                 pack_inode(c, p, old_dir, 1);
1314                 err = ubifs_node_calc_hash(c, p, hash_old_dir);
1315                 if (err)
1316                         goto out_release;
1317         } else {
1318                 pack_inode(c, p, old_dir, 0);
1319                 err = ubifs_node_calc_hash(c, p, hash_old_dir);
1320                 if (err)
1321                         goto out_release;
1322
1323                 p += ALIGN(plen, 8);
1324                 pack_inode(c, p, new_dir, 1);
1325                 err = ubifs_node_calc_hash(c, p, hash_new_dir);
1326                 if (err)
1327                         goto out_release;
1328         }
1329
1330         if (last_reference) {
1331                 err = ubifs_add_orphan(c, new_inode->i_ino);
1332                 if (err) {
1333                         release_head(c, BASEHD);
1334                         goto out_finish;
1335                 }
1336                 new_ui->del_cmtno = c->cmt_no;
1337         }
1338
1339         err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync);
1340         if (err)
1341                 goto out_release;
1342         if (!sync) {
1343                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1344
1345                 ubifs_wbuf_add_ino_nolock(wbuf, new_dir->i_ino);
1346                 ubifs_wbuf_add_ino_nolock(wbuf, old_dir->i_ino);
1347                 if (new_inode)
1348                         ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
1349                                                   new_inode->i_ino);
1350         }
1351         release_head(c, BASEHD);
1352
1353         ubifs_add_auth_dirt(c, lnum);
1354
1355         dent_key_init(c, &key, new_dir->i_ino, new_nm);
1356         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, new_nm);
1357         if (err)
1358                 goto out_ro;
1359
1360         offs += aligned_dlen1;
1361         if (whiteout) {
1362                 dent_key_init(c, &key, old_dir->i_ino, old_nm);
1363                 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, old_nm);
1364                 if (err)
1365                         goto out_ro;
1366
1367                 ubifs_delete_orphan(c, whiteout->i_ino);
1368         } else {
1369                 err = ubifs_add_dirt(c, lnum, dlen2);
1370                 if (err)
1371                         goto out_ro;
1372
1373                 dent_key_init(c, &key, old_dir->i_ino, old_nm);
1374                 err = ubifs_tnc_remove_nm(c, &key, old_nm);
1375                 if (err)
1376                         goto out_ro;
1377         }
1378
1379         offs += aligned_dlen2;
1380         if (new_inode) {
1381                 ino_key_init(c, &key, new_inode->i_ino);
1382                 err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash_new_inode);
1383                 if (err)
1384                         goto out_ro;
1385                 offs += ALIGN(ilen, 8);
1386         }
1387
1388         ino_key_init(c, &key, old_dir->i_ino);
1389         err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_old_dir);
1390         if (err)
1391                 goto out_ro;
1392
1393         if (move) {
1394                 offs += ALIGN(plen, 8);
1395                 ino_key_init(c, &key, new_dir->i_ino);
1396                 err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_new_dir);
1397                 if (err)
1398                         goto out_ro;
1399         }
1400
1401         finish_reservation(c);
1402         if (new_inode) {
1403                 mark_inode_clean(c, new_ui);
1404                 spin_lock(&new_ui->ui_lock);
1405                 new_ui->synced_i_size = new_ui->ui_size;
1406                 spin_unlock(&new_ui->ui_lock);
1407         }
1408         mark_inode_clean(c, ubifs_inode(old_dir));
1409         if (move)
1410                 mark_inode_clean(c, ubifs_inode(new_dir));
1411         kfree(dent);
1412         return 0;
1413
1414 out_release:
1415         release_head(c, BASEHD);
1416 out_ro:
1417         ubifs_ro_mode(c, err);
1418         if (last_reference)
1419                 ubifs_delete_orphan(c, new_inode->i_ino);
1420 out_finish:
1421         finish_reservation(c);
1422 out_free:
1423         kfree(dent);
1424         return err;
1425 }
1426
1427 /**
1428  * truncate_data_node - re-compress/encrypt a truncated data node.
1429  * @c: UBIFS file-system description object
1430  * @inode: inode which referes to the data node
1431  * @block: data block number
1432  * @dn: data node to re-compress
1433  * @new_len: new length
1434  *
1435  * This function is used when an inode is truncated and the last data node of
1436  * the inode has to be re-compressed/encrypted and re-written.
1437  */
1438 static int truncate_data_node(const struct ubifs_info *c, const struct inode *inode,
1439                               unsigned int block, struct ubifs_data_node *dn,
1440                               int *new_len)
1441 {
1442         void *buf;
1443         int err, dlen, compr_type, out_len, old_dlen;
1444
1445         out_len = le32_to_cpu(dn->size);
1446         buf = kmalloc_array(out_len, WORST_COMPR_FACTOR, GFP_NOFS);
1447         if (!buf)
1448                 return -ENOMEM;
1449
1450         dlen = old_dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
1451         compr_type = le16_to_cpu(dn->compr_type);
1452
1453         if (IS_ENCRYPTED(inode)) {
1454                 err = ubifs_decrypt(inode, dn, &dlen, block);
1455                 if (err)
1456                         goto out;
1457         }
1458
1459         if (compr_type == UBIFS_COMPR_NONE) {
1460                 out_len = *new_len;
1461         } else {
1462                 err = ubifs_decompress(c, &dn->data, dlen, buf, &out_len, compr_type);
1463                 if (err)
1464                         goto out;
1465
1466                 ubifs_compress(c, buf, *new_len, &dn->data, &out_len, &compr_type);
1467         }
1468
1469         if (IS_ENCRYPTED(inode)) {
1470                 err = ubifs_encrypt(inode, dn, out_len, &old_dlen, block);
1471                 if (err)
1472                         goto out;
1473
1474                 out_len = old_dlen;
1475         } else {
1476                 dn->compr_size = 0;
1477         }
1478
1479         ubifs_assert(c, out_len <= UBIFS_BLOCK_SIZE);
1480         dn->compr_type = cpu_to_le16(compr_type);
1481         dn->size = cpu_to_le32(*new_len);
1482         *new_len = UBIFS_DATA_NODE_SZ + out_len;
1483         err = 0;
1484 out:
1485         kfree(buf);
1486         return err;
1487 }
1488
1489 /**
1490  * ubifs_jnl_truncate - update the journal for a truncation.
1491  * @c: UBIFS file-system description object
1492  * @inode: inode to truncate
1493  * @old_size: old size
1494  * @new_size: new size
1495  *
1496  * When the size of a file decreases due to truncation, a truncation node is
1497  * written, the journal tree is updated, and the last data block is re-written
1498  * if it has been affected. The inode is also updated in order to synchronize
1499  * the new inode size.
1500  *
1501  * This function marks the inode as clean and returns zero on success. In case
1502  * of failure, a negative error code is returned.
1503  */
1504 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
1505                        loff_t old_size, loff_t new_size)
1506 {
1507         union ubifs_key key, to_key;
1508         struct ubifs_ino_node *ino;
1509         struct ubifs_trun_node *trun;
1510         struct ubifs_data_node *uninitialized_var(dn);
1511         int err, dlen, len, lnum, offs, bit, sz, sync = IS_SYNC(inode);
1512         struct ubifs_inode *ui = ubifs_inode(inode);
1513         ino_t inum = inode->i_ino;
1514         unsigned int blk;
1515         u8 hash_ino[UBIFS_HASH_ARR_SZ];
1516         u8 hash_dn[UBIFS_HASH_ARR_SZ];
1517
1518         dbg_jnl("ino %lu, size %lld -> %lld",
1519                 (unsigned long)inum, old_size, new_size);
1520         ubifs_assert(c, !ui->data_len);
1521         ubifs_assert(c, S_ISREG(inode->i_mode));
1522         ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
1523
1524         sz = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ +
1525              UBIFS_MAX_DATA_NODE_SZ * WORST_COMPR_FACTOR;
1526
1527         sz += ubifs_auth_node_sz(c);
1528
1529         ino = kmalloc(sz, GFP_NOFS);
1530         if (!ino)
1531                 return -ENOMEM;
1532
1533         trun = (void *)ino + UBIFS_INO_NODE_SZ;
1534         trun->ch.node_type = UBIFS_TRUN_NODE;
1535         trun->inum = cpu_to_le32(inum);
1536         trun->old_size = cpu_to_le64(old_size);
1537         trun->new_size = cpu_to_le64(new_size);
1538         zero_trun_node_unused(trun);
1539
1540         dlen = new_size & (UBIFS_BLOCK_SIZE - 1);
1541         if (dlen) {
1542                 /* Get last data block so it can be truncated */
1543                 dn = (void *)trun + UBIFS_TRUN_NODE_SZ;
1544                 blk = new_size >> UBIFS_BLOCK_SHIFT;
1545                 data_key_init(c, &key, inum, blk);
1546                 dbg_jnlk(&key, "last block key ");
1547                 err = ubifs_tnc_lookup(c, &key, dn);
1548                 if (err == -ENOENT)
1549                         dlen = 0; /* Not found (so it is a hole) */
1550                 else if (err)
1551                         goto out_free;
1552                 else {
1553                         int dn_len = le32_to_cpu(dn->size);
1554
1555                         if (dn_len <= 0 || dn_len > UBIFS_BLOCK_SIZE) {
1556                                 ubifs_err(c, "bad data node (block %u, inode %lu)",
1557                                           blk, inode->i_ino);
1558                                 ubifs_dump_node(c, dn);
1559                                 goto out_free;
1560                         }
1561
1562                         if (dn_len <= dlen)
1563                                 dlen = 0; /* Nothing to do */
1564                         else {
1565                                 err = truncate_data_node(c, inode, blk, dn, &dlen);
1566                                 if (err)
1567                                         goto out_free;
1568                         }
1569                 }
1570         }
1571
1572         /* Must make reservation before allocating sequence numbers */
1573         len = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ;
1574
1575         if (ubifs_authenticated(c))
1576                 len += ALIGN(dlen, 8) + ubifs_auth_node_sz(c);
1577         else
1578                 len += dlen;
1579
1580         err = make_reservation(c, BASEHD, len);
1581         if (err)
1582                 goto out_free;
1583
1584         pack_inode(c, ino, inode, 0);
1585         err = ubifs_node_calc_hash(c, ino, hash_ino);
1586         if (err)
1587                 goto out_release;
1588
1589         ubifs_prep_grp_node(c, trun, UBIFS_TRUN_NODE_SZ, dlen ? 0 : 1);
1590         if (dlen) {
1591                 ubifs_prep_grp_node(c, dn, dlen, 1);
1592                 err = ubifs_node_calc_hash(c, dn, hash_dn);
1593                 if (err)
1594                         goto out_release;
1595         }
1596
1597         err = write_head(c, BASEHD, ino, len, &lnum, &offs, sync);
1598         if (err)
1599                 goto out_release;
1600         if (!sync)
1601                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, inum);
1602         release_head(c, BASEHD);
1603
1604         ubifs_add_auth_dirt(c, lnum);
1605
1606         if (dlen) {
1607                 sz = offs + UBIFS_INO_NODE_SZ + UBIFS_TRUN_NODE_SZ;
1608                 err = ubifs_tnc_add(c, &key, lnum, sz, dlen, hash_dn);
1609                 if (err)
1610                         goto out_ro;
1611         }
1612
1613         ino_key_init(c, &key, inum);
1614         err = ubifs_tnc_add(c, &key, lnum, offs, UBIFS_INO_NODE_SZ, hash_ino);
1615         if (err)
1616                 goto out_ro;
1617
1618         err = ubifs_add_dirt(c, lnum, UBIFS_TRUN_NODE_SZ);
1619         if (err)
1620                 goto out_ro;
1621
1622         bit = new_size & (UBIFS_BLOCK_SIZE - 1);
1623         blk = (new_size >> UBIFS_BLOCK_SHIFT) + (bit ? 1 : 0);
1624         data_key_init(c, &key, inum, blk);
1625
1626         bit = old_size & (UBIFS_BLOCK_SIZE - 1);
1627         blk = (old_size >> UBIFS_BLOCK_SHIFT) - (bit ? 0 : 1);
1628         data_key_init(c, &to_key, inum, blk);
1629
1630         err = ubifs_tnc_remove_range(c, &key, &to_key);
1631         if (err)
1632                 goto out_ro;
1633
1634         finish_reservation(c);
1635         spin_lock(&ui->ui_lock);
1636         ui->synced_i_size = ui->ui_size;
1637         spin_unlock(&ui->ui_lock);
1638         mark_inode_clean(c, ui);
1639         kfree(ino);
1640         return 0;
1641
1642 out_release:
1643         release_head(c, BASEHD);
1644 out_ro:
1645         ubifs_ro_mode(c, err);
1646         finish_reservation(c);
1647 out_free:
1648         kfree(ino);
1649         return err;
1650 }
1651
1652
1653 /**
1654  * ubifs_jnl_delete_xattr - delete an extended attribute.
1655  * @c: UBIFS file-system description object
1656  * @host: host inode
1657  * @inode: extended attribute inode
1658  * @nm: extended attribute entry name
1659  *
1660  * This function delete an extended attribute which is very similar to
1661  * un-linking regular files - it writes a deletion xentry, a deletion inode and
1662  * updates the target inode. Returns zero in case of success and a negative
1663  * error code in case of failure.
1664  */
1665 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
1666                            const struct inode *inode,
1667                            const struct fscrypt_name *nm)
1668 {
1669         int err, xlen, hlen, len, lnum, xent_offs, aligned_xlen, write_len;
1670         struct ubifs_dent_node *xent;
1671         struct ubifs_ino_node *ino;
1672         union ubifs_key xent_key, key1, key2;
1673         int sync = IS_DIRSYNC(host);
1674         struct ubifs_inode *host_ui = ubifs_inode(host);
1675         u8 hash[UBIFS_HASH_ARR_SZ];
1676
1677         ubifs_assert(c, inode->i_nlink == 0);
1678         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
1679
1680         /*
1681          * Since we are deleting the inode, we do not bother to attach any data
1682          * to it and assume its length is %UBIFS_INO_NODE_SZ.
1683          */
1684         xlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1;
1685         aligned_xlen = ALIGN(xlen, 8);
1686         hlen = host_ui->data_len + UBIFS_INO_NODE_SZ;
1687         len = aligned_xlen + UBIFS_INO_NODE_SZ + ALIGN(hlen, 8);
1688
1689         write_len = len + ubifs_auth_node_sz(c);
1690
1691         xent = kzalloc(write_len, GFP_NOFS);
1692         if (!xent)
1693                 return -ENOMEM;
1694
1695         /* Make reservation before allocating sequence numbers */
1696         err = make_reservation(c, BASEHD, write_len);
1697         if (err) {
1698                 kfree(xent);
1699                 return err;
1700         }
1701
1702         xent->ch.node_type = UBIFS_XENT_NODE;
1703         xent_key_init(c, &xent_key, host->i_ino, nm);
1704         key_write(c, &xent_key, xent->key);
1705         xent->inum = 0;
1706         xent->type = get_dent_type(inode->i_mode);
1707         xent->nlen = cpu_to_le16(fname_len(nm));
1708         memcpy(xent->name, fname_name(nm), fname_len(nm));
1709         xent->name[fname_len(nm)] = '\0';
1710         zero_dent_node_unused(xent);
1711         ubifs_prep_grp_node(c, xent, xlen, 0);
1712
1713         ino = (void *)xent + aligned_xlen;
1714         pack_inode(c, ino, inode, 0);
1715         ino = (void *)ino + UBIFS_INO_NODE_SZ;
1716         pack_inode(c, ino, host, 1);
1717         err = ubifs_node_calc_hash(c, ino, hash);
1718         if (err)
1719                 goto out_release;
1720
1721         err = write_head(c, BASEHD, xent, write_len, &lnum, &xent_offs, sync);
1722         if (!sync && !err)
1723                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, host->i_ino);
1724         release_head(c, BASEHD);
1725
1726         ubifs_add_auth_dirt(c, lnum);
1727         kfree(xent);
1728         if (err)
1729                 goto out_ro;
1730
1731         /* Remove the extended attribute entry from TNC */
1732         err = ubifs_tnc_remove_nm(c, &xent_key, nm);
1733         if (err)
1734                 goto out_ro;
1735         err = ubifs_add_dirt(c, lnum, xlen);
1736         if (err)
1737                 goto out_ro;
1738
1739         /*
1740          * Remove all nodes belonging to the extended attribute inode from TNC.
1741          * Well, there actually must be only one node - the inode itself.
1742          */
1743         lowest_ino_key(c, &key1, inode->i_ino);
1744         highest_ino_key(c, &key2, inode->i_ino);
1745         err = ubifs_tnc_remove_range(c, &key1, &key2);
1746         if (err)
1747                 goto out_ro;
1748         err = ubifs_add_dirt(c, lnum, UBIFS_INO_NODE_SZ);
1749         if (err)
1750                 goto out_ro;
1751
1752         /* And update TNC with the new host inode position */
1753         ino_key_init(c, &key1, host->i_ino);
1754         err = ubifs_tnc_add(c, &key1, lnum, xent_offs + len - hlen, hlen, hash);
1755         if (err)
1756                 goto out_ro;
1757
1758         finish_reservation(c);
1759         spin_lock(&host_ui->ui_lock);
1760         host_ui->synced_i_size = host_ui->ui_size;
1761         spin_unlock(&host_ui->ui_lock);
1762         mark_inode_clean(c, host_ui);
1763         return 0;
1764
1765 out_release:
1766         kfree(xent);
1767         release_head(c, BASEHD);
1768 out_ro:
1769         ubifs_ro_mode(c, err);
1770         finish_reservation(c);
1771         return err;
1772 }
1773
1774 /**
1775  * ubifs_jnl_change_xattr - change an extended attribute.
1776  * @c: UBIFS file-system description object
1777  * @inode: extended attribute inode
1778  * @host: host inode
1779  *
1780  * This function writes the updated version of an extended attribute inode and
1781  * the host inode to the journal (to the base head). The host inode is written
1782  * after the extended attribute inode in order to guarantee that the extended
1783  * attribute will be flushed when the inode is synchronized by 'fsync()' and
1784  * consequently, the write-buffer is synchronized. This function returns zero
1785  * in case of success and a negative error code in case of failure.
1786  */
1787 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode,
1788                            const struct inode *host)
1789 {
1790         int err, len1, len2, aligned_len, aligned_len1, lnum, offs;
1791         struct ubifs_inode *host_ui = ubifs_inode(host);
1792         struct ubifs_ino_node *ino;
1793         union ubifs_key key;
1794         int sync = IS_DIRSYNC(host);
1795         u8 hash_host[UBIFS_HASH_ARR_SZ];
1796         u8 hash[UBIFS_HASH_ARR_SZ];
1797
1798         dbg_jnl("ino %lu, ino %lu", host->i_ino, inode->i_ino);
1799         ubifs_assert(c, host->i_nlink > 0);
1800         ubifs_assert(c, inode->i_nlink > 0);
1801         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
1802
1803         len1 = UBIFS_INO_NODE_SZ + host_ui->data_len;
1804         len2 = UBIFS_INO_NODE_SZ + ubifs_inode(inode)->data_len;
1805         aligned_len1 = ALIGN(len1, 8);
1806         aligned_len = aligned_len1 + ALIGN(len2, 8);
1807
1808         aligned_len += ubifs_auth_node_sz(c);
1809
1810         ino = kzalloc(aligned_len, GFP_NOFS);
1811         if (!ino)
1812                 return -ENOMEM;
1813
1814         /* Make reservation before allocating sequence numbers */
1815         err = make_reservation(c, BASEHD, aligned_len);
1816         if (err)
1817                 goto out_free;
1818
1819         pack_inode(c, ino, host, 0);
1820         err = ubifs_node_calc_hash(c, ino, hash_host);
1821         if (err)
1822                 goto out_release;
1823         pack_inode(c, (void *)ino + aligned_len1, inode, 1);
1824         err = ubifs_node_calc_hash(c, (void *)ino + aligned_len1, hash);
1825         if (err)
1826                 goto out_release;
1827
1828         err = write_head(c, BASEHD, ino, aligned_len, &lnum, &offs, 0);
1829         if (!sync && !err) {
1830                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1831
1832                 ubifs_wbuf_add_ino_nolock(wbuf, host->i_ino);
1833                 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
1834         }
1835         release_head(c, BASEHD);
1836         if (err)
1837                 goto out_ro;
1838
1839         ubifs_add_auth_dirt(c, lnum);
1840
1841         ino_key_init(c, &key, host->i_ino);
1842         err = ubifs_tnc_add(c, &key, lnum, offs, len1, hash_host);
1843         if (err)
1844                 goto out_ro;
1845
1846         ino_key_init(c, &key, inode->i_ino);
1847         err = ubifs_tnc_add(c, &key, lnum, offs + aligned_len1, len2, hash);
1848         if (err)
1849                 goto out_ro;
1850
1851         finish_reservation(c);
1852         spin_lock(&host_ui->ui_lock);
1853         host_ui->synced_i_size = host_ui->ui_size;
1854         spin_unlock(&host_ui->ui_lock);
1855         mark_inode_clean(c, host_ui);
1856         kfree(ino);
1857         return 0;
1858
1859 out_release:
1860         release_head(c, BASEHD);
1861 out_ro:
1862         ubifs_ro_mode(c, err);
1863         finish_reservation(c);
1864 out_free:
1865         kfree(ino);
1866         return err;
1867 }
1868