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, orphan_added = 0;
 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                 orphan_added = 1;
 634         }
 635
 636         err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, sync);
 637         if (err)
 638                 goto out_release;
 639         if (!sync) {
 640                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
 641
 642                 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
 643                 ubifs_wbuf_add_ino_nolock(wbuf, dir->i_ino);
 644         }
 645         release_head(c, BASEHD);
 646         kfree(dent);
 647         ubifs_add_auth_dirt(c, lnum);
 648
 649         if (deletion) {
 650                 if (fname_name(nm) == NULL)
 651                         err = ubifs_tnc_remove_dh(c, &dent_key, nm->minor_hash);
 652                 else
 653                         err = ubifs_tnc_remove_nm(c, &dent_key, nm);
 654                 if (err)
 655                         goto out_ro;
 656                 err = ubifs_add_dirt(c, lnum, dlen);
 657         } else
 658                 err = ubifs_tnc_add_nm(c, &dent_key, lnum, dent_offs, dlen,
 659                                        hash_dent, nm);
 660         if (err)
 661                 goto out_ro;
 662
 663         /*
 664          * Note, we do not remove the inode from TNC even if the last reference
 665          * to it has just been deleted, because the inode may still be opened.
 666          * Instead, the inode has been added to orphan lists and the orphan
 667          * subsystem will take further care about it.
 668          */
 669         ino_key_init(c, &ino_key, inode->i_ino);
 670         ino_offs = dent_offs + aligned_dlen;
 671         err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, ilen, hash_ino);
 672         if (err)
 673                 goto out_ro;
 674
 675         ino_key_init(c, &ino_key, dir->i_ino);
 676         ino_offs += aligned_ilen;
 677         err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs,
 678                             UBIFS_INO_NODE_SZ + host_ui->data_len, hash_ino_host);
 679         if (err)
 680                 goto out_ro;
 681
 682         finish_reservation(c);
 683         spin_lock(&ui->ui_lock);
 684         ui->synced_i_size = ui->ui_size;
 685         spin_unlock(&ui->ui_lock);
 686         if (xent) {
 687                 spin_lock(&host_ui->ui_lock);
 688                 host_ui->synced_i_size = host_ui->ui_size;
 689                 spin_unlock(&host_ui->ui_lock);
 690         }
 691         mark_inode_clean(c, ui);
 692         mark_inode_clean(c, host_ui);
 693         return 0;
 694
 695 out_finish:
 696         finish_reservation(c);
 697 out_free:
 698         kfree(dent);
 699         return err;
 700
 701 out_release:
 702         release_head(c, BASEHD);
 703         kfree(dent);
 704 out_ro:
 705         ubifs_ro_mode(c, err);
 706         if (orphan_added)
 707                 ubifs_delete_orphan(c, inode->i_ino);
 708         finish_reservation(c);
 709         return err;
 710 }
 711
 712 /**
 713  * ubifs_jnl_write_data - write a data node to the journal.
 714  * @c: UBIFS file-system description object
 715  * @inode: inode the data node belongs to
 716  * @key: node key
 717  * @buf: buffer to write
 718  * @len: data length (must not exceed %UBIFS_BLOCK_SIZE)
 719  *
 720  * This function writes a data node to the journal. Returns %0 if the data node
 721  * was successfully written, and a negative error code in case of failure.
 722  */
 723 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
 724                          const union ubifs_key *key, const void *buf, int len)
 725 {
 726         struct ubifs_data_node *data;
 727         int err, lnum, offs, compr_type, out_len, compr_len, auth_len;
 728         int dlen = COMPRESSED_DATA_NODE_BUF_SZ, allocated = 1;
 729         int write_len;
 730         struct ubifs_inode *ui = ubifs_inode(inode);
 731         bool encrypted = IS_ENCRYPTED(inode);
 732         u8 hash[UBIFS_HASH_ARR_SZ];
 733
 734         dbg_jnlk(key, "ino %lu, blk %u, len %d, key ",
 735                 (unsigned long)key_inum(c, key), key_block(c, key), len);
 736         ubifs_assert(c, len <= UBIFS_BLOCK_SIZE);
 737
 738         if (encrypted)
 739                 dlen += UBIFS_CIPHER_BLOCK_SIZE;
 740
 741         auth_len = ubifs_auth_node_sz(c);
 742
 743         data = kmalloc(dlen + auth_len, GFP_NOFS | __GFP_NOWARN);
 744         if (!data) {
 745                 /*
 746                  * Fall-back to the write reserve buffer. Note, we might be
 747                  * currently on the memory reclaim path, when the kernel is
 748                  * trying to free some memory by writing out dirty pages. The
 749                  * write reserve buffer helps us to guarantee that we are
 750                  * always able to write the data.
 751                  */
 752                 allocated = 0;
 753                 mutex_lock(&c->write_reserve_mutex);
 754                 data = c->write_reserve_buf;
 755         }
 756
 757         data->ch.node_type = UBIFS_DATA_NODE;
 758         key_write(c, key, &data->key);
 759         data->size = cpu_to_le32(len);
 760
 761         if (!(ui->flags & UBIFS_COMPR_FL))
 762                 /* Compression is disabled for this inode */
 763                 compr_type = UBIFS_COMPR_NONE;
 764         else
 765                 compr_type = ui->compr_type;
 766
 767         out_len = compr_len = dlen - UBIFS_DATA_NODE_SZ;
 768         ubifs_compress(c, buf, len, &data->data, &compr_len, &compr_type);
 769         ubifs_assert(c, compr_len <= UBIFS_BLOCK_SIZE);
 770
 771         if (encrypted) {
 772                 err = ubifs_encrypt(inode, data, compr_len, &out_len, key_block(c, key));
 773                 if (err)
 774                         goto out_free;
 775
 776         } else {
 777                 data->compr_size = 0;
 778                 out_len = compr_len;
 779         }
 780
 781         dlen = UBIFS_DATA_NODE_SZ + out_len;
 782         if (ubifs_authenticated(c))
 783                 write_len = ALIGN(dlen, 8) + auth_len;
 784         else
 785                 write_len = dlen;
 786
 787         data->compr_type = cpu_to_le16(compr_type);
 788
 789         /* Make reservation before allocating sequence numbers */
 790         err = make_reservation(c, DATAHD, write_len);
 791         if (err)
 792                 goto out_free;
 793
 794         ubifs_prepare_node(c, data, dlen, 0);
 795         err = write_head(c, DATAHD, data, write_len, &lnum, &offs, 0);
 796         if (err)
 797                 goto out_release;
 798
 799         err = ubifs_node_calc_hash(c, data, hash);
 800         if (err)
 801                 goto out_release;
 802
 803         ubifs_wbuf_add_ino_nolock(&c->jheads[DATAHD].wbuf, key_inum(c, key));
 804         release_head(c, DATAHD);
 805
 806         ubifs_add_auth_dirt(c, lnum);
 807
 808         err = ubifs_tnc_add(c, key, lnum, offs, dlen, hash);
 809         if (err)
 810                 goto out_ro;
 811
 812         finish_reservation(c);
 813         if (!allocated)
 814                 mutex_unlock(&c->write_reserve_mutex);
 815         else
 816                 kfree(data);
 817         return 0;
 818
 819 out_release:
 820         release_head(c, DATAHD);
 821 out_ro:
 822         ubifs_ro_mode(c, err);
 823         finish_reservation(c);
 824 out_free:
 825         if (!allocated)
 826                 mutex_unlock(&c->write_reserve_mutex);
 827         else
 828                 kfree(data);
 829         return err;
 830 }
 831
 832 /**
 833  * ubifs_jnl_write_inode - flush inode to the journal.
 834  * @c: UBIFS file-system description object
 835  * @inode: inode to flush
 836  *
 837  * This function writes inode @inode to the journal. If the inode is
 838  * synchronous, it also synchronizes the write-buffer. Returns zero in case of
 839  * success and a negative error code in case of failure.
 840  */
 841 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
 842 {
 843         int err, lnum, offs;
 844         struct ubifs_ino_node *ino, *ino_start;
 845         struct ubifs_inode *ui = ubifs_inode(inode);
 846         int sync = 0, write_len = 0, ilen = UBIFS_INO_NODE_SZ;
 847         int last_reference = !inode->i_nlink;
 848         int kill_xattrs = ui->xattr_cnt && last_reference;
 849         u8 hash[UBIFS_HASH_ARR_SZ];
 850
 851         dbg_jnl("ino %lu, nlink %u", inode->i_ino, inode->i_nlink);
 852
 853         /*
 854          * If the inode is being deleted, do not write the attached data. No
 855          * need to synchronize the write-buffer either.
 856          */
 857         if (!last_reference) {
 858                 ilen += ui->data_len;
 859                 sync = IS_SYNC(inode);
 860         } else if (kill_xattrs) {
 861                 write_len += UBIFS_INO_NODE_SZ * ui->xattr_cnt;
 862         }
 863
 864         if (ubifs_authenticated(c))
 865                 write_len += ALIGN(ilen, 8) + ubifs_auth_node_sz(c);
 866         else
 867                 write_len += ilen;
 868
 869         ino_start = ino = kmalloc(write_len, GFP_NOFS);
 870         if (!ino)
 871                 return -ENOMEM;
 872
 873         /* Make reservation before allocating sequence numbers */
 874         err = make_reservation(c, BASEHD, write_len);
 875         if (err)
 876                 goto out_free;
 877
 878         if (kill_xattrs) {
 879                 union ubifs_key key;
 880                 struct fscrypt_name nm = {0};
 881                 struct inode *xino;
 882                 struct ubifs_dent_node *xent, *pxent = NULL;
 883
 884                 if (ui->xattr_cnt >= ubifs_xattr_max_cnt(c)) {
 885                         ubifs_err(c, "Cannot delete inode, it has too much xattrs!");
 886                         goto out_release;
 887                 }
 888
 889                 lowest_xent_key(c, &key, inode->i_ino);
 890                 while (1) {
 891                         xent = ubifs_tnc_next_ent(c, &key, &nm);
 892                         if (IS_ERR(xent)) {
 893                                 err = PTR_ERR(xent);
 894                                 if (err == -ENOENT)
 895                                         break;
 896
 897                                 kfree(pxent);
 898                                 goto out_release;
 899                         }
 900
 901                         fname_name(&nm) = xent->name;
 902                         fname_len(&nm) = le16_to_cpu(xent->nlen);
 903
 904                         xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum));
 905                         if (IS_ERR(xino)) {
 906                                 err = PTR_ERR(xino);
 907                                 ubifs_err(c, "dead directory entry '%s', error %d",
 908                                           xent->name, err);
 909                                 ubifs_ro_mode(c, err);
 910                                 kfree(pxent);
 911                                 kfree(xent);
 912                                 goto out_release;
 913                         }
 914                         ubifs_assert(c, ubifs_inode(xino)->xattr);
 915
 916                         clear_nlink(xino);
 917                         pack_inode(c, ino, xino, 0);
 918                         ino = (void *)ino + UBIFS_INO_NODE_SZ;
 919                         iput(xino);
 920
 921                         kfree(pxent);
 922                         pxent = xent;
 923                         key_read(c, &xent->key, &key);
 924                 }
 925                 kfree(pxent);
 926         }
 927
 928         pack_inode(c, ino, inode, 1);
 929         err = ubifs_node_calc_hash(c, ino, hash);
 930         if (err)
 931                 goto out_release;
 932
 933         err = write_head(c, BASEHD, ino_start, write_len, &lnum, &offs, sync);
 934         if (err)
 935                 goto out_release;
 936         if (!sync)
 937                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
 938                                           inode->i_ino);
 939         release_head(c, BASEHD);
 940
 941         if (last_reference) {
 942                 err = ubifs_tnc_remove_ino(c, inode->i_ino);
 943                 if (err)
 944                         goto out_ro;
 945                 ubifs_delete_orphan(c, inode->i_ino);
 946                 err = ubifs_add_dirt(c, lnum, write_len);
 947         } else {
 948                 union ubifs_key key;
 949
 950                 ubifs_add_auth_dirt(c, lnum);
 951
 952                 ino_key_init(c, &key, inode->i_ino);
 953                 err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash);
 954         }
 955         if (err)
 956                 goto out_ro;
 957
 958         finish_reservation(c);
 959         spin_lock(&ui->ui_lock);
 960         ui->synced_i_size = ui->ui_size;
 961         spin_unlock(&ui->ui_lock);
 962         kfree(ino_start);
 963         return 0;
 964
 965 out_release:
 966         release_head(c, BASEHD);
 967 out_ro:
 968         ubifs_ro_mode(c, err);
 969         finish_reservation(c);
 970 out_free:
 971         kfree(ino_start);
 972         return err;
 973 }
 974
 975 /**
 976  * ubifs_jnl_delete_inode - delete an inode.
 977  * @c: UBIFS file-system description object
 978  * @inode: inode to delete
 979  *
 980  * This function deletes inode @inode which includes removing it from orphans,
 981  * deleting it from TNC and, in some cases, writing a deletion inode to the
 982  * journal.
 983  *
 984  * When regular file inodes are unlinked or a directory inode is removed, the
 985  * 'ubifs_jnl_update()' function writes a corresponding deletion inode and
 986  * direntry to the media, and adds the inode to orphans. After this, when the
 987  * last reference to this inode has been dropped, this function is called. In
 988  * general, it has to write one more deletion inode to the media, because if
 989  * a commit happened between 'ubifs_jnl_update()' and
 990  * 'ubifs_jnl_delete_inode()', the deletion inode is not in the journal
 991  * anymore, and in fact it might not be on the flash anymore, because it might
 992  * have been garbage-collected already. And for optimization reasons UBIFS does
 993  * not read the orphan area if it has been unmounted cleanly, so it would have
 994  * no indication in the journal that there is a deleted inode which has to be
 995  * removed from TNC.
 996  *
 997  * However, if there was no commit between 'ubifs_jnl_update()' and
 998  * 'ubifs_jnl_delete_inode()', then there is no need to write the deletion
 999  * inode to the media for the second time. And this is quite a typical case.
1000  *
1001  * This function returns zero in case of success and a negative error code in
1002  * case of failure.
1003  */
1004 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode)
1005 {
1006         int err;
1007         struct ubifs_inode *ui = ubifs_inode(inode);
1008
1009         ubifs_assert(c, inode->i_nlink == 0);
1010
1011         if (ui->xattr_cnt || ui->del_cmtno != c->cmt_no)
1012                 /* A commit happened for sure or inode hosts xattrs */
1013                 return ubifs_jnl_write_inode(c, inode);
1014
1015         down_read(&c->commit_sem);
1016         /*
1017          * Check commit number again, because the first test has been done
1018          * without @c->commit_sem, so a commit might have happened.
1019          */
1020         if (ui->del_cmtno != c->cmt_no) {
1021                 up_read(&c->commit_sem);
1022                 return ubifs_jnl_write_inode(c, inode);
1023         }
1024
1025         err = ubifs_tnc_remove_ino(c, inode->i_ino);
1026         if (err)
1027                 ubifs_ro_mode(c, err);
1028         else
1029                 ubifs_delete_orphan(c, inode->i_ino);
1030         up_read(&c->commit_sem);
1031         return err;
1032 }
1033
1034 /**
1035  * ubifs_jnl_xrename - cross rename two directory entries.
1036  * @c: UBIFS file-system description object
1037  * @fst_dir: parent inode of 1st directory entry to exchange
1038  * @fst_inode: 1st inode to exchange
1039  * @fst_nm: name of 1st inode to exchange
1040  * @snd_dir: parent inode of 2nd directory entry to exchange
1041  * @snd_inode: 2nd inode to exchange
1042  * @snd_nm: name of 2nd inode to exchange
1043  * @sync: non-zero if the write-buffer has to be synchronized
1044  *
1045  * This function implements the cross rename operation which may involve
1046  * writing 2 inodes and 2 directory entries. It marks the written inodes as clean
1047  * and returns zero on success. In case of failure, a negative error code is
1048  * returned.
1049  */
1050 int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
1051                       const struct inode *fst_inode,
1052                       const struct fscrypt_name *fst_nm,
1053                       const struct inode *snd_dir,
1054                       const struct inode *snd_inode,
1055                       const struct fscrypt_name *snd_nm, int sync)
1056 {
1057         union ubifs_key key;
1058         struct ubifs_dent_node *dent1, *dent2;
1059         int err, dlen1, dlen2, lnum, offs, len, plen = UBIFS_INO_NODE_SZ;
1060         int aligned_dlen1, aligned_dlen2;
1061         int twoparents = (fst_dir != snd_dir);
1062         void *p;
1063         u8 hash_dent1[UBIFS_HASH_ARR_SZ];
1064         u8 hash_dent2[UBIFS_HASH_ARR_SZ];
1065         u8 hash_p1[UBIFS_HASH_ARR_SZ];
1066         u8 hash_p2[UBIFS_HASH_ARR_SZ];
1067
1068         ubifs_assert(c, ubifs_inode(fst_dir)->data_len == 0);
1069         ubifs_assert(c, ubifs_inode(snd_dir)->data_len == 0);
1070         ubifs_assert(c, mutex_is_locked(&ubifs_inode(fst_dir)->ui_mutex));
1071         ubifs_assert(c, mutex_is_locked(&ubifs_inode(snd_dir)->ui_mutex));
1072
1073         dlen1 = UBIFS_DENT_NODE_SZ + fname_len(snd_nm) + 1;
1074         dlen2 = UBIFS_DENT_NODE_SZ + fname_len(fst_nm) + 1;
1075         aligned_dlen1 = ALIGN(dlen1, 8);
1076         aligned_dlen2 = ALIGN(dlen2, 8);
1077
1078         len = aligned_dlen1 + aligned_dlen2 + ALIGN(plen, 8);
1079         if (twoparents)
1080                 len += plen;
1081
1082         len += ubifs_auth_node_sz(c);
1083
1084         dent1 = kzalloc(len, GFP_NOFS);
1085         if (!dent1)
1086                 return -ENOMEM;
1087
1088         /* Make reservation before allocating sequence numbers */
1089         err = make_reservation(c, BASEHD, len);
1090         if (err)
1091                 goto out_free;
1092
1093         /* Make new dent for 1st entry */
1094         dent1->ch.node_type = UBIFS_DENT_NODE;
1095         dent_key_init_flash(c, &dent1->key, snd_dir->i_ino, snd_nm);
1096         dent1->inum = cpu_to_le64(fst_inode->i_ino);
1097         dent1->type = get_dent_type(fst_inode->i_mode);
1098         dent1->nlen = cpu_to_le16(fname_len(snd_nm));
1099         memcpy(dent1->name, fname_name(snd_nm), fname_len(snd_nm));
1100         dent1->name[fname_len(snd_nm)] = '\0';
1101         set_dent_cookie(c, dent1);
1102         zero_dent_node_unused(dent1);
1103         ubifs_prep_grp_node(c, dent1, dlen1, 0);
1104         err = ubifs_node_calc_hash(c, dent1, hash_dent1);
1105         if (err)
1106                 goto out_release;
1107
1108         /* Make new dent for 2nd entry */
1109         dent2 = (void *)dent1 + aligned_dlen1;
1110         dent2->ch.node_type = UBIFS_DENT_NODE;
1111         dent_key_init_flash(c, &dent2->key, fst_dir->i_ino, fst_nm);
1112         dent2->inum = cpu_to_le64(snd_inode->i_ino);
1113         dent2->type = get_dent_type(snd_inode->i_mode);
1114         dent2->nlen = cpu_to_le16(fname_len(fst_nm));
1115         memcpy(dent2->name, fname_name(fst_nm), fname_len(fst_nm));
1116         dent2->name[fname_len(fst_nm)] = '\0';
1117         set_dent_cookie(c, dent2);
1118         zero_dent_node_unused(dent2);
1119         ubifs_prep_grp_node(c, dent2, dlen2, 0);
1120         err = ubifs_node_calc_hash(c, dent2, hash_dent2);
1121         if (err)
1122                 goto out_release;
1123
1124         p = (void *)dent2 + aligned_dlen2;
1125         if (!twoparents) {
1126                 pack_inode(c, p, fst_dir, 1);
1127                 err = ubifs_node_calc_hash(c, p, hash_p1);
1128                 if (err)
1129                         goto out_release;
1130         } else {
1131                 pack_inode(c, p, fst_dir, 0);
1132                 err = ubifs_node_calc_hash(c, p, hash_p1);
1133                 if (err)
1134                         goto out_release;
1135                 p += ALIGN(plen, 8);
1136                 pack_inode(c, p, snd_dir, 1);
1137                 err = ubifs_node_calc_hash(c, p, hash_p2);
1138                 if (err)
1139                         goto out_release;
1140         }
1141
1142         err = write_head(c, BASEHD, dent1, len, &lnum, &offs, sync);
1143         if (err)
1144                 goto out_release;
1145         if (!sync) {
1146                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1147
1148                 ubifs_wbuf_add_ino_nolock(wbuf, fst_dir->i_ino);
1149                 ubifs_wbuf_add_ino_nolock(wbuf, snd_dir->i_ino);
1150         }
1151         release_head(c, BASEHD);
1152
1153         ubifs_add_auth_dirt(c, lnum);
1154
1155         dent_key_init(c, &key, snd_dir->i_ino, snd_nm);
1156         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, snd_nm);
1157         if (err)
1158                 goto out_ro;
1159
1160         offs += aligned_dlen1;
1161         dent_key_init(c, &key, fst_dir->i_ino, fst_nm);
1162         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, fst_nm);
1163         if (err)
1164                 goto out_ro;
1165
1166         offs += aligned_dlen2;
1167
1168         ino_key_init(c, &key, fst_dir->i_ino);
1169         err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p1);
1170         if (err)
1171                 goto out_ro;
1172
1173         if (twoparents) {
1174                 offs += ALIGN(plen, 8);
1175                 ino_key_init(c, &key, snd_dir->i_ino);
1176                 err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p2);
1177                 if (err)
1178                         goto out_ro;
1179         }
1180
1181         finish_reservation(c);
1182
1183         mark_inode_clean(c, ubifs_inode(fst_dir));
1184         if (twoparents)
1185                 mark_inode_clean(c, ubifs_inode(snd_dir));
1186         kfree(dent1);
1187         return 0;
1188
1189 out_release:
1190         release_head(c, BASEHD);
1191 out_ro:
1192         ubifs_ro_mode(c, err);
1193         finish_reservation(c);
1194 out_free:
1195         kfree(dent1);
1196         return err;
1197 }
1198
1199 /**
1200  * ubifs_jnl_rename - rename a directory entry.
1201  * @c: UBIFS file-system description object
1202  * @old_dir: parent inode of directory entry to rename
1203  * @old_dentry: directory entry to rename
1204  * @new_dir: parent inode of directory entry to rename
1205  * @new_dentry: new directory entry (or directory entry to replace)
1206  * @sync: non-zero if the write-buffer has to be synchronized
1207  *
1208  * This function implements the re-name operation which may involve writing up
1209  * to 4 inodes and 2 directory entries. It marks the written inodes as clean
1210  * and returns zero on success. In case of failure, a negative error code is
1211  * returned.
1212  */
1213 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
1214                      const struct inode *old_inode,
1215                      const struct fscrypt_name *old_nm,
1216                      const struct inode *new_dir,
1217                      const struct inode *new_inode,
1218                      const struct fscrypt_name *new_nm,
1219                      const struct inode *whiteout, int sync)
1220 {
1221         void *p;
1222         union ubifs_key key;
1223         struct ubifs_dent_node *dent, *dent2;
1224         int err, dlen1, dlen2, ilen, lnum, offs, len, orphan_added = 0;
1225         int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ;
1226         int last_reference = !!(new_inode && new_inode->i_nlink == 0);
1227         int move = (old_dir != new_dir);
1228         struct ubifs_inode *new_ui;
1229         u8 hash_old_dir[UBIFS_HASH_ARR_SZ];
1230         u8 hash_new_dir[UBIFS_HASH_ARR_SZ];
1231         u8 hash_new_inode[UBIFS_HASH_ARR_SZ];
1232         u8 hash_dent1[UBIFS_HASH_ARR_SZ];
1233         u8 hash_dent2[UBIFS_HASH_ARR_SZ];
1234
1235         ubifs_assert(c, ubifs_inode(old_dir)->data_len == 0);
1236         ubifs_assert(c, ubifs_inode(new_dir)->data_len == 0);
1237         ubifs_assert(c, mutex_is_locked(&ubifs_inode(old_dir)->ui_mutex));
1238         ubifs_assert(c, mutex_is_locked(&ubifs_inode(new_dir)->ui_mutex));
1239
1240         dlen1 = UBIFS_DENT_NODE_SZ + fname_len(new_nm) + 1;
1241         dlen2 = UBIFS_DENT_NODE_SZ + fname_len(old_nm) + 1;
1242         if (new_inode) {
1243                 new_ui = ubifs_inode(new_inode);
1244                 ubifs_assert(c, mutex_is_locked(&new_ui->ui_mutex));
1245                 ilen = UBIFS_INO_NODE_SZ;
1246                 if (!last_reference)
1247                         ilen += new_ui->data_len;
1248         } else
1249                 ilen = 0;
1250
1251         aligned_dlen1 = ALIGN(dlen1, 8);
1252         aligned_dlen2 = ALIGN(dlen2, 8);
1253         len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + ALIGN(plen, 8);
1254         if (move)
1255                 len += plen;
1256
1257         len += ubifs_auth_node_sz(c);
1258
1259         dent = kzalloc(len, GFP_NOFS);
1260         if (!dent)
1261                 return -ENOMEM;
1262
1263         /* Make reservation before allocating sequence numbers */
1264         err = make_reservation(c, BASEHD, len);
1265         if (err)
1266                 goto out_free;
1267
1268         /* Make new dent */
1269         dent->ch.node_type = UBIFS_DENT_NODE;
1270         dent_key_init_flash(c, &dent->key, new_dir->i_ino, new_nm);
1271         dent->inum = cpu_to_le64(old_inode->i_ino);
1272         dent->type = get_dent_type(old_inode->i_mode);
1273         dent->nlen = cpu_to_le16(fname_len(new_nm));
1274         memcpy(dent->name, fname_name(new_nm), fname_len(new_nm));
1275         dent->name[fname_len(new_nm)] = '\0';
1276         set_dent_cookie(c, dent);
1277         zero_dent_node_unused(dent);
1278         ubifs_prep_grp_node(c, dent, dlen1, 0);
1279         err = ubifs_node_calc_hash(c, dent, hash_dent1);
1280         if (err)
1281                 goto out_release;
1282
1283         dent2 = (void *)dent + aligned_dlen1;
1284         dent2->ch.node_type = UBIFS_DENT_NODE;
1285         dent_key_init_flash(c, &dent2->key, old_dir->i_ino, old_nm);
1286
1287         if (whiteout) {
1288                 dent2->inum = cpu_to_le64(whiteout->i_ino);
1289                 dent2->type = get_dent_type(whiteout->i_mode);
1290         } else {
1291                 /* Make deletion dent */
1292                 dent2->inum = 0;
1293                 dent2->type = DT_UNKNOWN;
1294         }
1295         dent2->nlen = cpu_to_le16(fname_len(old_nm));
1296         memcpy(dent2->name, fname_name(old_nm), fname_len(old_nm));
1297         dent2->name[fname_len(old_nm)] = '\0';
1298         set_dent_cookie(c, dent2);
1299         zero_dent_node_unused(dent2);
1300         ubifs_prep_grp_node(c, dent2, dlen2, 0);
1301         err = ubifs_node_calc_hash(c, dent2, hash_dent2);
1302         if (err)
1303                 goto out_release;
1304
1305         p = (void *)dent2 + aligned_dlen2;
1306         if (new_inode) {
1307                 pack_inode(c, p, new_inode, 0);
1308                 err = ubifs_node_calc_hash(c, p, hash_new_inode);
1309                 if (err)
1310                         goto out_release;
1311
1312                 p += ALIGN(ilen, 8);
1313         }
1314
1315         if (!move) {
1316                 pack_inode(c, p, old_dir, 1);
1317                 err = ubifs_node_calc_hash(c, p, hash_old_dir);
1318                 if (err)
1319                         goto out_release;
1320         } else {
1321                 pack_inode(c, p, old_dir, 0);
1322                 err = ubifs_node_calc_hash(c, p, hash_old_dir);
1323                 if (err)
1324                         goto out_release;
1325
1326                 p += ALIGN(plen, 8);
1327                 pack_inode(c, p, new_dir, 1);
1328                 err = ubifs_node_calc_hash(c, p, hash_new_dir);
1329                 if (err)
1330                         goto out_release;
1331         }
1332
1333         if (last_reference) {
1334                 err = ubifs_add_orphan(c, new_inode->i_ino);
1335                 if (err) {
1336                         release_head(c, BASEHD);
1337                         goto out_finish;
1338                 }
1339                 new_ui->del_cmtno = c->cmt_no;
1340                 orphan_added = 1;
1341         }
1342
1343         err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync);
1344         if (err)
1345                 goto out_release;
1346         if (!sync) {
1347                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1348
1349                 ubifs_wbuf_add_ino_nolock(wbuf, new_dir->i_ino);
1350                 ubifs_wbuf_add_ino_nolock(wbuf, old_dir->i_ino);
1351                 if (new_inode)
1352                         ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
1353                                                   new_inode->i_ino);
1354         }
1355         release_head(c, BASEHD);
1356
1357         ubifs_add_auth_dirt(c, lnum);
1358
1359         dent_key_init(c, &key, new_dir->i_ino, new_nm);
1360         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, new_nm);
1361         if (err)
1362                 goto out_ro;
1363
1364         offs += aligned_dlen1;
1365         if (whiteout) {
1366                 dent_key_init(c, &key, old_dir->i_ino, old_nm);
1367                 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, old_nm);
1368                 if (err)
1369                         goto out_ro;
1370
1371                 ubifs_delete_orphan(c, whiteout->i_ino);
1372         } else {
1373                 err = ubifs_add_dirt(c, lnum, dlen2);
1374                 if (err)
1375                         goto out_ro;
1376
1377                 dent_key_init(c, &key, old_dir->i_ino, old_nm);
1378                 err = ubifs_tnc_remove_nm(c, &key, old_nm);
1379                 if (err)
1380                         goto out_ro;
1381         }
1382
1383         offs += aligned_dlen2;
1384         if (new_inode) {
1385                 ino_key_init(c, &key, new_inode->i_ino);
1386                 err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash_new_inode);
1387                 if (err)
1388                         goto out_ro;
1389                 offs += ALIGN(ilen, 8);
1390         }
1391
1392         ino_key_init(c, &key, old_dir->i_ino);
1393         err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_old_dir);
1394         if (err)
1395                 goto out_ro;
1396
1397         if (move) {
1398                 offs += ALIGN(plen, 8);
1399                 ino_key_init(c, &key, new_dir->i_ino);
1400                 err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_new_dir);
1401                 if (err)
1402                         goto out_ro;
1403         }
1404
1405         finish_reservation(c);
1406         if (new_inode) {
1407                 mark_inode_clean(c, new_ui);
1408                 spin_lock(&new_ui->ui_lock);
1409                 new_ui->synced_i_size = new_ui->ui_size;
1410                 spin_unlock(&new_ui->ui_lock);
1411         }
1412         mark_inode_clean(c, ubifs_inode(old_dir));
1413         if (move)
1414                 mark_inode_clean(c, ubifs_inode(new_dir));
1415         kfree(dent);
1416         return 0;
1417
1418 out_release:
1419         release_head(c, BASEHD);
1420 out_ro:
1421         ubifs_ro_mode(c, err);
1422         if (orphan_added)
1423                 ubifs_delete_orphan(c, new_inode->i_ino);
1424 out_finish:
1425         finish_reservation(c);
1426 out_free:
1427         kfree(dent);
1428         return err;
1429 }
1430
1431 /**
1432  * truncate_data_node - re-compress/encrypt a truncated data node.
1433  * @c: UBIFS file-system description object
1434  * @inode: inode which referes to the data node
1435  * @block: data block number
1436  * @dn: data node to re-compress
1437  * @new_len: new length
1438  *
1439  * This function is used when an inode is truncated and the last data node of
1440  * the inode has to be re-compressed/encrypted and re-written.
1441  */
1442 static int truncate_data_node(const struct ubifs_info *c, const struct inode *inode,
1443                               unsigned int block, struct ubifs_data_node *dn,
1444                               int *new_len)
1445 {
1446         void *buf;
1447         int err, dlen, compr_type, out_len, old_dlen;
1448
1449         out_len = le32_to_cpu(dn->size);
1450         buf = kmalloc_array(out_len, WORST_COMPR_FACTOR, GFP_NOFS);
1451         if (!buf)
1452                 return -ENOMEM;
1453
1454         dlen = old_dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
1455         compr_type = le16_to_cpu(dn->compr_type);
1456
1457         if (IS_ENCRYPTED(inode)) {
1458                 err = ubifs_decrypt(inode, dn, &dlen, block);
1459                 if (err)
1460                         goto out;
1461         }
1462
1463         if (compr_type == UBIFS_COMPR_NONE) {
1464                 out_len = *new_len;
1465         } else {
1466                 err = ubifs_decompress(c, &dn->data, dlen, buf, &out_len, compr_type);
1467                 if (err)
1468                         goto out;
1469
1470                 ubifs_compress(c, buf, *new_len, &dn->data, &out_len, &compr_type);
1471         }
1472
1473         if (IS_ENCRYPTED(inode)) {
1474                 err = ubifs_encrypt(inode, dn, out_len, &old_dlen, block);
1475                 if (err)
1476                         goto out;
1477
1478                 out_len = old_dlen;
1479         } else {
1480                 dn->compr_size = 0;
1481         }
1482
1483         ubifs_assert(c, out_len <= UBIFS_BLOCK_SIZE);
1484         dn->compr_type = cpu_to_le16(compr_type);
1485         dn->size = cpu_to_le32(*new_len);
1486         *new_len = UBIFS_DATA_NODE_SZ + out_len;
1487         err = 0;
1488 out:
1489         kfree(buf);
1490         return err;
1491 }
1492
1493 /**
1494  * ubifs_jnl_truncate - update the journal for a truncation.
1495  * @c: UBIFS file-system description object
1496  * @inode: inode to truncate
1497  * @old_size: old size
1498  * @new_size: new size
1499  *
1500  * When the size of a file decreases due to truncation, a truncation node is
1501  * written, the journal tree is updated, and the last data block is re-written
1502  * if it has been affected. The inode is also updated in order to synchronize
1503  * the new inode size.
1504  *
1505  * This function marks the inode as clean and returns zero on success. In case
1506  * of failure, a negative error code is returned.
1507  */
1508 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
1509                        loff_t old_size, loff_t new_size)
1510 {
1511         union ubifs_key key, to_key;
1512         struct ubifs_ino_node *ino;
1513         struct ubifs_trun_node *trun;
1514         struct ubifs_data_node *dn;
1515         int err, dlen, len, lnum, offs, bit, sz, sync = IS_SYNC(inode);
1516         struct ubifs_inode *ui = ubifs_inode(inode);
1517         ino_t inum = inode->i_ino;
1518         unsigned int blk;
1519         u8 hash_ino[UBIFS_HASH_ARR_SZ];
1520         u8 hash_dn[UBIFS_HASH_ARR_SZ];
1521
1522         dbg_jnl("ino %lu, size %lld -> %lld",
1523                 (unsigned long)inum, old_size, new_size);
1524         ubifs_assert(c, !ui->data_len);
1525         ubifs_assert(c, S_ISREG(inode->i_mode));
1526         ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
1527
1528         sz = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ +
1529              UBIFS_MAX_DATA_NODE_SZ * WORST_COMPR_FACTOR;
1530
1531         sz += ubifs_auth_node_sz(c);
1532
1533         ino = kmalloc(sz, GFP_NOFS);
1534         if (!ino)
1535                 return -ENOMEM;
1536
1537         trun = (void *)ino + UBIFS_INO_NODE_SZ;
1538         trun->ch.node_type = UBIFS_TRUN_NODE;
1539         trun->inum = cpu_to_le32(inum);
1540         trun->old_size = cpu_to_le64(old_size);
1541         trun->new_size = cpu_to_le64(new_size);
1542         zero_trun_node_unused(trun);
1543
1544         dlen = new_size & (UBIFS_BLOCK_SIZE - 1);
1545         if (dlen) {
1546                 /* Get last data block so it can be truncated */
1547                 dn = (void *)trun + UBIFS_TRUN_NODE_SZ;
1548                 blk = new_size >> UBIFS_BLOCK_SHIFT;
1549                 data_key_init(c, &key, inum, blk);
1550                 dbg_jnlk(&key, "last block key ");
1551                 err = ubifs_tnc_lookup(c, &key, dn);
1552                 if (err == -ENOENT)
1553                         dlen = 0; /* Not found (so it is a hole) */
1554                 else if (err)
1555                         goto out_free;
1556                 else {
1557                         int dn_len = le32_to_cpu(dn->size);
1558
1559                         if (dn_len <= 0 || dn_len > UBIFS_BLOCK_SIZE) {
1560                                 ubifs_err(c, "bad data node (block %u, inode %lu)",
1561                                           blk, inode->i_ino);
1562                                 ubifs_dump_node(c, dn);
1563                                 goto out_free;
1564                         }
1565
1566                         if (dn_len <= dlen)
1567                                 dlen = 0; /* Nothing to do */
1568                         else {
1569                                 err = truncate_data_node(c, inode, blk, dn, &dlen);
1570                                 if (err)
1571                                         goto out_free;
1572                         }
1573                 }
1574         }
1575
1576         /* Must make reservation before allocating sequence numbers */
1577         len = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ;
1578
1579         if (ubifs_authenticated(c))
1580                 len += ALIGN(dlen, 8) + ubifs_auth_node_sz(c);
1581         else
1582                 len += dlen;
1583
1584         err = make_reservation(c, BASEHD, len);
1585         if (err)
1586                 goto out_free;
1587
1588         pack_inode(c, ino, inode, 0);
1589         err = ubifs_node_calc_hash(c, ino, hash_ino);
1590         if (err)
1591                 goto out_release;
1592
1593         ubifs_prep_grp_node(c, trun, UBIFS_TRUN_NODE_SZ, dlen ? 0 : 1);
1594         if (dlen) {
1595                 ubifs_prep_grp_node(c, dn, dlen, 1);
1596                 err = ubifs_node_calc_hash(c, dn, hash_dn);
1597                 if (err)
1598                         goto out_release;
1599         }
1600
1601         err = write_head(c, BASEHD, ino, len, &lnum, &offs, sync);
1602         if (err)
1603                 goto out_release;
1604         if (!sync)
1605                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, inum);
1606         release_head(c, BASEHD);
1607
1608         ubifs_add_auth_dirt(c, lnum);
1609
1610         if (dlen) {
1611                 sz = offs + UBIFS_INO_NODE_SZ + UBIFS_TRUN_NODE_SZ;
1612                 err = ubifs_tnc_add(c, &key, lnum, sz, dlen, hash_dn);
1613                 if (err)
1614                         goto out_ro;
1615         }
1616
1617         ino_key_init(c, &key, inum);
1618         err = ubifs_tnc_add(c, &key, lnum, offs, UBIFS_INO_NODE_SZ, hash_ino);
1619         if (err)
1620                 goto out_ro;
1621
1622         err = ubifs_add_dirt(c, lnum, UBIFS_TRUN_NODE_SZ);
1623         if (err)
1624                 goto out_ro;
1625
1626         bit = new_size & (UBIFS_BLOCK_SIZE - 1);
1627         blk = (new_size >> UBIFS_BLOCK_SHIFT) + (bit ? 1 : 0);
1628         data_key_init(c, &key, inum, blk);
1629
1630         bit = old_size & (UBIFS_BLOCK_SIZE - 1);
1631         blk = (old_size >> UBIFS_BLOCK_SHIFT) - (bit ? 0 : 1);
1632         data_key_init(c, &to_key, inum, blk);
1633
1634         err = ubifs_tnc_remove_range(c, &key, &to_key);
1635         if (err)
1636                 goto out_ro;
1637
1638         finish_reservation(c);
1639         spin_lock(&ui->ui_lock);
1640         ui->synced_i_size = ui->ui_size;
1641         spin_unlock(&ui->ui_lock);
1642         mark_inode_clean(c, ui);
1643         kfree(ino);
1644         return 0;
1645
1646 out_release:
1647         release_head(c, BASEHD);
1648 out_ro:
1649         ubifs_ro_mode(c, err);
1650         finish_reservation(c);
1651 out_free:
1652         kfree(ino);
1653         return err;
1654 }
1655
1656
1657 /**
1658  * ubifs_jnl_delete_xattr - delete an extended attribute.
1659  * @c: UBIFS file-system description object
1660  * @host: host inode
1661  * @inode: extended attribute inode
1662  * @nm: extended attribute entry name
1663  *
1664  * This function delete an extended attribute which is very similar to
1665  * un-linking regular files - it writes a deletion xentry, a deletion inode and
1666  * updates the target inode. Returns zero in case of success and a negative
1667  * error code in case of failure.
1668  */
1669 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
1670                            const struct inode *inode,
1671                            const struct fscrypt_name *nm)
1672 {
1673         int err, xlen, hlen, len, lnum, xent_offs, aligned_xlen, write_len;
1674         struct ubifs_dent_node *xent;
1675         struct ubifs_ino_node *ino;
1676         union ubifs_key xent_key, key1, key2;
1677         int sync = IS_DIRSYNC(host);
1678         struct ubifs_inode *host_ui = ubifs_inode(host);
1679         u8 hash[UBIFS_HASH_ARR_SZ];
1680
1681         ubifs_assert(c, inode->i_nlink == 0);
1682         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
1683
1684         /*
1685          * Since we are deleting the inode, we do not bother to attach any data
1686          * to it and assume its length is %UBIFS_INO_NODE_SZ.
1687          */
1688         xlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1;
1689         aligned_xlen = ALIGN(xlen, 8);
1690         hlen = host_ui->data_len + UBIFS_INO_NODE_SZ;
1691         len = aligned_xlen + UBIFS_INO_NODE_SZ + ALIGN(hlen, 8);
1692
1693         write_len = len + ubifs_auth_node_sz(c);
1694
1695         xent = kzalloc(write_len, GFP_NOFS);
1696         if (!xent)
1697                 return -ENOMEM;
1698
1699         /* Make reservation before allocating sequence numbers */
1700         err = make_reservation(c, BASEHD, write_len);
1701         if (err) {
1702                 kfree(xent);
1703                 return err;
1704         }
1705
1706         xent->ch.node_type = UBIFS_XENT_NODE;
1707         xent_key_init(c, &xent_key, host->i_ino, nm);
1708         key_write(c, &xent_key, xent->key);
1709         xent->inum = 0;
1710         xent->type = get_dent_type(inode->i_mode);
1711         xent->nlen = cpu_to_le16(fname_len(nm));
1712         memcpy(xent->name, fname_name(nm), fname_len(nm));
1713         xent->name[fname_len(nm)] = '\0';
1714         zero_dent_node_unused(xent);
1715         ubifs_prep_grp_node(c, xent, xlen, 0);
1716
1717         ino = (void *)xent + aligned_xlen;
1718         pack_inode(c, ino, inode, 0);
1719         ino = (void *)ino + UBIFS_INO_NODE_SZ;
1720         pack_inode(c, ino, host, 1);
1721         err = ubifs_node_calc_hash(c, ino, hash);
1722         if (err)
1723                 goto out_release;
1724
1725         err = write_head(c, BASEHD, xent, write_len, &lnum, &xent_offs, sync);
1726         if (!sync && !err)
1727                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, host->i_ino);
1728         release_head(c, BASEHD);
1729
1730         ubifs_add_auth_dirt(c, lnum);
1731         kfree(xent);
1732         if (err)
1733                 goto out_ro;
1734
1735         /* Remove the extended attribute entry from TNC */
1736         err = ubifs_tnc_remove_nm(c, &xent_key, nm);
1737         if (err)
1738                 goto out_ro;
1739         err = ubifs_add_dirt(c, lnum, xlen);
1740         if (err)
1741                 goto out_ro;
1742
1743         /*
1744          * Remove all nodes belonging to the extended attribute inode from TNC.
1745          * Well, there actually must be only one node - the inode itself.
1746          */
1747         lowest_ino_key(c, &key1, inode->i_ino);
1748         highest_ino_key(c, &key2, inode->i_ino);
1749         err = ubifs_tnc_remove_range(c, &key1, &key2);
1750         if (err)
1751                 goto out_ro;
1752         err = ubifs_add_dirt(c, lnum, UBIFS_INO_NODE_SZ);
1753         if (err)
1754                 goto out_ro;
1755
1756         /* And update TNC with the new host inode position */
1757         ino_key_init(c, &key1, host->i_ino);
1758         err = ubifs_tnc_add(c, &key1, lnum, xent_offs + len - hlen, hlen, hash);
1759         if (err)
1760                 goto out_ro;
1761
1762         finish_reservation(c);
1763         spin_lock(&host_ui->ui_lock);
1764         host_ui->synced_i_size = host_ui->ui_size;
1765         spin_unlock(&host_ui->ui_lock);
1766         mark_inode_clean(c, host_ui);
1767         return 0;
1768
1769 out_release:
1770         kfree(xent);
1771         release_head(c, BASEHD);
1772 out_ro:
1773         ubifs_ro_mode(c, err);
1774         finish_reservation(c);
1775         return err;
1776 }
1777
1778 /**
1779  * ubifs_jnl_change_xattr - change an extended attribute.
1780  * @c: UBIFS file-system description object
1781  * @inode: extended attribute inode
1782  * @host: host inode
1783  *
1784  * This function writes the updated version of an extended attribute inode and
1785  * the host inode to the journal (to the base head). The host inode is written
1786  * after the extended attribute inode in order to guarantee that the extended
1787  * attribute will be flushed when the inode is synchronized by 'fsync()' and
1788  * consequently, the write-buffer is synchronized. This function returns zero
1789  * in case of success and a negative error code in case of failure.
1790  */
1791 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode,
1792                            const struct inode *host)
1793 {
1794         int err, len1, len2, aligned_len, aligned_len1, lnum, offs;
1795         struct ubifs_inode *host_ui = ubifs_inode(host);
1796         struct ubifs_ino_node *ino;
1797         union ubifs_key key;
1798         int sync = IS_DIRSYNC(host);
1799         u8 hash_host[UBIFS_HASH_ARR_SZ];
1800         u8 hash[UBIFS_HASH_ARR_SZ];
1801
1802         dbg_jnl("ino %lu, ino %lu", host->i_ino, inode->i_ino);
1803         ubifs_assert(c, inode->i_nlink > 0);
1804         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
1805
1806         len1 = UBIFS_INO_NODE_SZ + host_ui->data_len;
1807         len2 = UBIFS_INO_NODE_SZ + ubifs_inode(inode)->data_len;
1808         aligned_len1 = ALIGN(len1, 8);
1809         aligned_len = aligned_len1 + ALIGN(len2, 8);
1810
1811         aligned_len += ubifs_auth_node_sz(c);
1812
1813         ino = kzalloc(aligned_len, GFP_NOFS);
1814         if (!ino)
1815                 return -ENOMEM;
1816
1817         /* Make reservation before allocating sequence numbers */
1818         err = make_reservation(c, BASEHD, aligned_len);
1819         if (err)
1820                 goto out_free;
1821
1822         pack_inode(c, ino, host, 0);
1823         err = ubifs_node_calc_hash(c, ino, hash_host);
1824         if (err)
1825                 goto out_release;
1826         pack_inode(c, (void *)ino + aligned_len1, inode, 1);
1827         err = ubifs_node_calc_hash(c, (void *)ino + aligned_len1, hash);
1828         if (err)
1829                 goto out_release;
1830
1831         err = write_head(c, BASEHD, ino, aligned_len, &lnum, &offs, 0);
1832         if (!sync && !err) {
1833                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1834
1835                 ubifs_wbuf_add_ino_nolock(wbuf, host->i_ino);
1836                 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
1837         }
1838         release_head(c, BASEHD);
1839         if (err)
1840                 goto out_ro;
1841
1842         ubifs_add_auth_dirt(c, lnum);
1843
1844         ino_key_init(c, &key, host->i_ino);
1845         err = ubifs_tnc_add(c, &key, lnum, offs, len1, hash_host);
1846         if (err)
1847                 goto out_ro;
1848
1849         ino_key_init(c, &key, inode->i_ino);
1850         err = ubifs_tnc_add(c, &key, lnum, offs + aligned_len1, len2, hash);
1851         if (err)
1852                 goto out_ro;
1853
1854         finish_reservation(c);
1855         spin_lock(&host_ui->ui_lock);
1856         host_ui->synced_i_size = host_ui->ui_size;
1857         spin_unlock(&host_ui->ui_lock);
1858         mark_inode_clean(c, host_ui);
1859         kfree(ino);
1860         return 0;
1861
1862 out_release:
1863         release_head(c, BASEHD);
1864 out_ro:
1865         ubifs_ro_mode(c, err);
1866         finish_reservation(c);
1867 out_free:
1868         kfree(ino);
1869         return err;
1870 }
1871