fs/ubifs/journal.c

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This source file includes following definitions.
zero_ino_node_unused
zero_dent_node_unused
zero_trun_node_unused
ubifs_add_auth_dirt
reserve_space
ubifs_hash_nodes
write_head
make_reservation
release_head
finish_reservation
get_dent_type
pack_inode
mark_inode_clean
set_dent_cookie
ubifs_jnl_update
ubifs_jnl_write_data
ubifs_jnl_write_inode
ubifs_jnl_delete_inode
ubifs_jnl_xrename
ubifs_jnl_rename
truncate_data_node
ubifs_jnl_truncate
ubifs_jnl_delete_xattr
ubifs_jnl_change_xattr
   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 = 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 (nm->hash)
 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 (nm->hash)
 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 = ubifs_crypt_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                                 goto out_release;
 909                         }
 910                         ubifs_assert(c, ubifs_inode(xino)->xattr);
 911 
 912                         clear_nlink(xino);
 913                         pack_inode(c, ino, xino, 0);
 914                         ino = (void *)ino + UBIFS_INO_NODE_SZ;
 915                         iput(xino);
 916 
 917                         kfree(pxent);
 918                         pxent = xent;
 919                         key_read(c, &xent->key, &key);
 920                 }
 921                 kfree(pxent);
 922         }
 923 
 924         pack_inode(c, ino, inode, 1);
 925         err = ubifs_node_calc_hash(c, ino, hash);
 926         if (err)
 927                 goto out_release;
 928 
 929         err = write_head(c, BASEHD, ino_start, write_len, &lnum, &offs, sync);
 930         if (err)
 931                 goto out_release;
 932         if (!sync)
 933                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
 934                                           inode->i_ino);
 935         release_head(c, BASEHD);
 936 
 937         ubifs_add_auth_dirt(c, lnum);
 938 
 939         if (last_reference) {
 940                 err = ubifs_tnc_remove_ino(c, inode->i_ino);
 941                 if (err)
 942                         goto out_ro;
 943                 ubifs_delete_orphan(c, inode->i_ino);
 944                 err = ubifs_add_dirt(c, lnum, write_len);
 945         } else {
 946                 union ubifs_key key;
 947 
 948                 ino_key_init(c, &key, inode->i_ino);
 949                 err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash);
 950         }
 951         if (err)
 952                 goto out_ro;
 953 
 954         finish_reservation(c);
 955         spin_lock(&ui->ui_lock);
 956         ui->synced_i_size = ui->ui_size;
 957         spin_unlock(&ui->ui_lock);
 958         kfree(ino_start);
 959         return 0;
 960 
 961 out_release:
 962         release_head(c, BASEHD);
 963 out_ro:
 964         ubifs_ro_mode(c, err);
 965         finish_reservation(c);
 966 out_free:
 967         kfree(ino_start);
 968         return err;
 969 }
 970 
 971 /**
 972  * ubifs_jnl_delete_inode - delete an inode.
 973  * @c: UBIFS file-system description object
 974  * @inode: inode to delete
 975  *
 976  * This function deletes inode @inode which includes removing it from orphans,
 977  * deleting it from TNC and, in some cases, writing a deletion inode to the
 978  * journal.
 979  *
 980  * When regular file inodes are unlinked or a directory inode is removed, the
 981  * 'ubifs_jnl_update()' function writes a corresponding deletion inode and
 982  * direntry to the media, and adds the inode to orphans. After this, when the
 983  * last reference to this inode has been dropped, this function is called. In
 984  * general, it has to write one more deletion inode to the media, because if
 985  * a commit happened between 'ubifs_jnl_update()' and
 986  * 'ubifs_jnl_delete_inode()', the deletion inode is not in the journal
 987  * anymore, and in fact it might not be on the flash anymore, because it might
 988  * have been garbage-collected already. And for optimization reasons UBIFS does
 989  * not read the orphan area if it has been unmounted cleanly, so it would have
 990  * no indication in the journal that there is a deleted inode which has to be
 991  * removed from TNC.
 992  *
 993  * However, if there was no commit between 'ubifs_jnl_update()' and
 994  * 'ubifs_jnl_delete_inode()', then there is no need to write the deletion
 995  * inode to the media for the second time. And this is quite a typical case.
 996  *
 997  * This function returns zero in case of success and a negative error code in
 998  * case of failure.
 999  */
1000 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode)
1001 {
1002         int err;
1003         struct ubifs_inode *ui = ubifs_inode(inode);
1004 
1005         ubifs_assert(c, inode->i_nlink == 0);
1006 
1007         if (ui->xattr_cnt || ui->del_cmtno != c->cmt_no)
1008                 /* A commit happened for sure or inode hosts xattrs */
1009                 return ubifs_jnl_write_inode(c, inode);
1010 
1011         down_read(&c->commit_sem);
1012         /*
1013          * Check commit number again, because the first test has been done
1014          * without @c->commit_sem, so a commit might have happened.
1015          */
1016         if (ui->del_cmtno != c->cmt_no) {
1017                 up_read(&c->commit_sem);
1018                 return ubifs_jnl_write_inode(c, inode);
1019         }
1020 
1021         err = ubifs_tnc_remove_ino(c, inode->i_ino);
1022         if (err)
1023                 ubifs_ro_mode(c, err);
1024         else
1025                 ubifs_delete_orphan(c, inode->i_ino);
1026         up_read(&c->commit_sem);
1027         return err;
1028 }
1029 
1030 /**
1031  * ubifs_jnl_xrename - cross rename two directory entries.
1032  * @c: UBIFS file-system description object
1033  * @fst_dir: parent inode of 1st directory entry to exchange
1034  * @fst_inode: 1st inode to exchange
1035  * @fst_nm: name of 1st inode to exchange
1036  * @snd_dir: parent inode of 2nd directory entry to exchange
1037  * @snd_inode: 2nd inode to exchange
1038  * @snd_nm: name of 2nd inode to exchange
1039  * @sync: non-zero if the write-buffer has to be synchronized
1040  *
1041  * This function implements the cross rename operation which may involve
1042  * writing 2 inodes and 2 directory entries. It marks the written inodes as clean
1043  * and returns zero on success. In case of failure, a negative error code is
1044  * returned.
1045  */
1046 int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
1047                       const struct inode *fst_inode,
1048                       const struct fscrypt_name *fst_nm,
1049                       const struct inode *snd_dir,
1050                       const struct inode *snd_inode,
1051                       const struct fscrypt_name *snd_nm, int sync)
1052 {
1053         union ubifs_key key;
1054         struct ubifs_dent_node *dent1, *dent2;
1055         int err, dlen1, dlen2, lnum, offs, len, plen = UBIFS_INO_NODE_SZ;
1056         int aligned_dlen1, aligned_dlen2;
1057         int twoparents = (fst_dir != snd_dir);
1058         void *p;
1059         u8 hash_dent1[UBIFS_HASH_ARR_SZ];
1060         u8 hash_dent2[UBIFS_HASH_ARR_SZ];
1061         u8 hash_p1[UBIFS_HASH_ARR_SZ];
1062         u8 hash_p2[UBIFS_HASH_ARR_SZ];
1063 
1064         ubifs_assert(c, ubifs_inode(fst_dir)->data_len == 0);
1065         ubifs_assert(c, ubifs_inode(snd_dir)->data_len == 0);
1066         ubifs_assert(c, mutex_is_locked(&ubifs_inode(fst_dir)->ui_mutex));
1067         ubifs_assert(c, mutex_is_locked(&ubifs_inode(snd_dir)->ui_mutex));
1068 
1069         dlen1 = UBIFS_DENT_NODE_SZ + fname_len(snd_nm) + 1;
1070         dlen2 = UBIFS_DENT_NODE_SZ + fname_len(fst_nm) + 1;
1071         aligned_dlen1 = ALIGN(dlen1, 8);
1072         aligned_dlen2 = ALIGN(dlen2, 8);
1073 
1074         len = aligned_dlen1 + aligned_dlen2 + ALIGN(plen, 8);
1075         if (twoparents)
1076                 len += plen;
1077 
1078         len += ubifs_auth_node_sz(c);
1079 
1080         dent1 = kzalloc(len, GFP_NOFS);
1081         if (!dent1)
1082                 return -ENOMEM;
1083 
1084         /* Make reservation before allocating sequence numbers */
1085         err = make_reservation(c, BASEHD, len);
1086         if (err)
1087                 goto out_free;
1088 
1089         /* Make new dent for 1st entry */
1090         dent1->ch.node_type = UBIFS_DENT_NODE;
1091         dent_key_init_flash(c, &dent1->key, snd_dir->i_ino, snd_nm);
1092         dent1->inum = cpu_to_le64(fst_inode->i_ino);
1093         dent1->type = get_dent_type(fst_inode->i_mode);
1094         dent1->nlen = cpu_to_le16(fname_len(snd_nm));
1095         memcpy(dent1->name, fname_name(snd_nm), fname_len(snd_nm));
1096         dent1->name[fname_len(snd_nm)] = '\0';
1097         set_dent_cookie(c, dent1);
1098         zero_dent_node_unused(dent1);
1099         ubifs_prep_grp_node(c, dent1, dlen1, 0);
1100         err = ubifs_node_calc_hash(c, dent1, hash_dent1);
1101         if (err)
1102                 goto out_release;
1103 
1104         /* Make new dent for 2nd entry */
1105         dent2 = (void *)dent1 + aligned_dlen1;
1106         dent2->ch.node_type = UBIFS_DENT_NODE;
1107         dent_key_init_flash(c, &dent2->key, fst_dir->i_ino, fst_nm);
1108         dent2->inum = cpu_to_le64(snd_inode->i_ino);
1109         dent2->type = get_dent_type(snd_inode->i_mode);
1110         dent2->nlen = cpu_to_le16(fname_len(fst_nm));
1111         memcpy(dent2->name, fname_name(fst_nm), fname_len(fst_nm));
1112         dent2->name[fname_len(fst_nm)] = '\0';
1113         set_dent_cookie(c, dent2);
1114         zero_dent_node_unused(dent2);
1115         ubifs_prep_grp_node(c, dent2, dlen2, 0);
1116         err = ubifs_node_calc_hash(c, dent2, hash_dent2);
1117         if (err)
1118                 goto out_release;
1119 
1120         p = (void *)dent2 + aligned_dlen2;
1121         if (!twoparents) {
1122                 pack_inode(c, p, fst_dir, 1);
1123                 err = ubifs_node_calc_hash(c, p, hash_p1);
1124                 if (err)
1125                         goto out_release;
1126         } else {
1127                 pack_inode(c, p, fst_dir, 0);
1128                 err = ubifs_node_calc_hash(c, p, hash_p1);
1129                 if (err)
1130                         goto out_release;
1131                 p += ALIGN(plen, 8);
1132                 pack_inode(c, p, snd_dir, 1);
1133                 err = ubifs_node_calc_hash(c, p, hash_p2);
1134                 if (err)
1135                         goto out_release;
1136         }
1137 
1138         err = write_head(c, BASEHD, dent1, len, &lnum, &offs, sync);
1139         if (err)
1140                 goto out_release;
1141         if (!sync) {
1142                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1143 
1144                 ubifs_wbuf_add_ino_nolock(wbuf, fst_dir->i_ino);
1145                 ubifs_wbuf_add_ino_nolock(wbuf, snd_dir->i_ino);
1146         }
1147         release_head(c, BASEHD);
1148 
1149         ubifs_add_auth_dirt(c, lnum);
1150 
1151         dent_key_init(c, &key, snd_dir->i_ino, snd_nm);
1152         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, snd_nm);
1153         if (err)
1154                 goto out_ro;
1155 
1156         offs += aligned_dlen1;
1157         dent_key_init(c, &key, fst_dir->i_ino, fst_nm);
1158         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, fst_nm);
1159         if (err)
1160                 goto out_ro;
1161 
1162         offs += aligned_dlen2;
1163 
1164         ino_key_init(c, &key, fst_dir->i_ino);
1165         err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p1);
1166         if (err)
1167                 goto out_ro;
1168 
1169         if (twoparents) {
1170                 offs += ALIGN(plen, 8);
1171                 ino_key_init(c, &key, snd_dir->i_ino);
1172                 err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_p2);
1173                 if (err)
1174                         goto out_ro;
1175         }
1176 
1177         finish_reservation(c);
1178 
1179         mark_inode_clean(c, ubifs_inode(fst_dir));
1180         if (twoparents)
1181                 mark_inode_clean(c, ubifs_inode(snd_dir));
1182         kfree(dent1);
1183         return 0;
1184 
1185 out_release:
1186         release_head(c, BASEHD);
1187 out_ro:
1188         ubifs_ro_mode(c, err);
1189         finish_reservation(c);
1190 out_free:
1191         kfree(dent1);
1192         return err;
1193 }
1194 
1195 /**
1196  * ubifs_jnl_rename - rename a directory entry.
1197  * @c: UBIFS file-system description object
1198  * @old_dir: parent inode of directory entry to rename
1199  * @old_dentry: directory entry to rename
1200  * @new_dir: parent inode of directory entry to rename
1201  * @new_dentry: new directory entry (or directory entry to replace)
1202  * @sync: non-zero if the write-buffer has to be synchronized
1203  *
1204  * This function implements the re-name operation which may involve writing up
1205  * to 4 inodes and 2 directory entries. It marks the written inodes as clean
1206  * and returns zero on success. In case of failure, a negative error code is
1207  * returned.
1208  */
1209 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
1210                      const struct inode *old_inode,
1211                      const struct fscrypt_name *old_nm,
1212                      const struct inode *new_dir,
1213                      const struct inode *new_inode,
1214                      const struct fscrypt_name *new_nm,
1215                      const struct inode *whiteout, int sync)
1216 {
1217         void *p;
1218         union ubifs_key key;
1219         struct ubifs_dent_node *dent, *dent2;
1220         int err, dlen1, dlen2, ilen, lnum, offs, len;
1221         int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ;
1222         int last_reference = !!(new_inode && new_inode->i_nlink == 0);
1223         int move = (old_dir != new_dir);
1224         struct ubifs_inode *uninitialized_var(new_ui);
1225         u8 hash_old_dir[UBIFS_HASH_ARR_SZ];
1226         u8 hash_new_dir[UBIFS_HASH_ARR_SZ];
1227         u8 hash_new_inode[UBIFS_HASH_ARR_SZ];
1228         u8 hash_dent1[UBIFS_HASH_ARR_SZ];
1229         u8 hash_dent2[UBIFS_HASH_ARR_SZ];
1230 
1231         ubifs_assert(c, ubifs_inode(old_dir)->data_len == 0);
1232         ubifs_assert(c, ubifs_inode(new_dir)->data_len == 0);
1233         ubifs_assert(c, mutex_is_locked(&ubifs_inode(old_dir)->ui_mutex));
1234         ubifs_assert(c, mutex_is_locked(&ubifs_inode(new_dir)->ui_mutex));
1235 
1236         dlen1 = UBIFS_DENT_NODE_SZ + fname_len(new_nm) + 1;
1237         dlen2 = UBIFS_DENT_NODE_SZ + fname_len(old_nm) + 1;
1238         if (new_inode) {
1239                 new_ui = ubifs_inode(new_inode);
1240                 ubifs_assert(c, mutex_is_locked(&new_ui->ui_mutex));
1241                 ilen = UBIFS_INO_NODE_SZ;
1242                 if (!last_reference)
1243                         ilen += new_ui->data_len;
1244         } else
1245                 ilen = 0;
1246 
1247         aligned_dlen1 = ALIGN(dlen1, 8);
1248         aligned_dlen2 = ALIGN(dlen2, 8);
1249         len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + ALIGN(plen, 8);
1250         if (move)
1251                 len += plen;
1252 
1253         len += ubifs_auth_node_sz(c);
1254 
1255         dent = kzalloc(len, GFP_NOFS);
1256         if (!dent)
1257                 return -ENOMEM;
1258 
1259         /* Make reservation before allocating sequence numbers */
1260         err = make_reservation(c, BASEHD, len);
1261         if (err)
1262                 goto out_free;
1263 
1264         /* Make new dent */
1265         dent->ch.node_type = UBIFS_DENT_NODE;
1266         dent_key_init_flash(c, &dent->key, new_dir->i_ino, new_nm);
1267         dent->inum = cpu_to_le64(old_inode->i_ino);
1268         dent->type = get_dent_type(old_inode->i_mode);
1269         dent->nlen = cpu_to_le16(fname_len(new_nm));
1270         memcpy(dent->name, fname_name(new_nm), fname_len(new_nm));
1271         dent->name[fname_len(new_nm)] = '\0';
1272         set_dent_cookie(c, dent);
1273         zero_dent_node_unused(dent);
1274         ubifs_prep_grp_node(c, dent, dlen1, 0);
1275         err = ubifs_node_calc_hash(c, dent, hash_dent1);
1276         if (err)
1277                 goto out_release;
1278 
1279         dent2 = (void *)dent + aligned_dlen1;
1280         dent2->ch.node_type = UBIFS_DENT_NODE;
1281         dent_key_init_flash(c, &dent2->key, old_dir->i_ino, old_nm);
1282 
1283         if (whiteout) {
1284                 dent2->inum = cpu_to_le64(whiteout->i_ino);
1285                 dent2->type = get_dent_type(whiteout->i_mode);
1286         } else {
1287                 /* Make deletion dent */
1288                 dent2->inum = 0;
1289                 dent2->type = DT_UNKNOWN;
1290         }
1291         dent2->nlen = cpu_to_le16(fname_len(old_nm));
1292         memcpy(dent2->name, fname_name(old_nm), fname_len(old_nm));
1293         dent2->name[fname_len(old_nm)] = '\0';
1294         set_dent_cookie(c, dent2);
1295         zero_dent_node_unused(dent2);
1296         ubifs_prep_grp_node(c, dent2, dlen2, 0);
1297         err = ubifs_node_calc_hash(c, dent2, hash_dent2);
1298         if (err)
1299                 goto out_release;
1300 
1301         p = (void *)dent2 + aligned_dlen2;
1302         if (new_inode) {
1303                 pack_inode(c, p, new_inode, 0);
1304                 err = ubifs_node_calc_hash(c, p, hash_new_inode);
1305                 if (err)
1306                         goto out_release;
1307 
1308                 p += ALIGN(ilen, 8);
1309         }
1310 
1311         if (!move) {
1312                 pack_inode(c, p, old_dir, 1);
1313                 err = ubifs_node_calc_hash(c, p, hash_old_dir);
1314                 if (err)
1315                         goto out_release;
1316         } else {
1317                 pack_inode(c, p, old_dir, 0);
1318                 err = ubifs_node_calc_hash(c, p, hash_old_dir);
1319                 if (err)
1320                         goto out_release;
1321 
1322                 p += ALIGN(plen, 8);
1323                 pack_inode(c, p, new_dir, 1);
1324                 err = ubifs_node_calc_hash(c, p, hash_new_dir);
1325                 if (err)
1326                         goto out_release;
1327         }
1328 
1329         if (last_reference) {
1330                 err = ubifs_add_orphan(c, new_inode->i_ino);
1331                 if (err) {
1332                         release_head(c, BASEHD);
1333                         goto out_finish;
1334                 }
1335                 new_ui->del_cmtno = c->cmt_no;
1336         }
1337 
1338         err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync);
1339         if (err)
1340                 goto out_release;
1341         if (!sync) {
1342                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1343 
1344                 ubifs_wbuf_add_ino_nolock(wbuf, new_dir->i_ino);
1345                 ubifs_wbuf_add_ino_nolock(wbuf, old_dir->i_ino);
1346                 if (new_inode)
1347                         ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
1348                                                   new_inode->i_ino);
1349         }
1350         release_head(c, BASEHD);
1351 
1352         ubifs_add_auth_dirt(c, lnum);
1353 
1354         dent_key_init(c, &key, new_dir->i_ino, new_nm);
1355         err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, hash_dent1, new_nm);
1356         if (err)
1357                 goto out_ro;
1358 
1359         offs += aligned_dlen1;
1360         if (whiteout) {
1361                 dent_key_init(c, &key, old_dir->i_ino, old_nm);
1362                 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, hash_dent2, old_nm);
1363                 if (err)
1364                         goto out_ro;
1365 
1366                 ubifs_delete_orphan(c, whiteout->i_ino);
1367         } else {
1368                 err = ubifs_add_dirt(c, lnum, dlen2);
1369                 if (err)
1370                         goto out_ro;
1371 
1372                 dent_key_init(c, &key, old_dir->i_ino, old_nm);
1373                 err = ubifs_tnc_remove_nm(c, &key, old_nm);
1374                 if (err)
1375                         goto out_ro;
1376         }
1377 
1378         offs += aligned_dlen2;
1379         if (new_inode) {
1380                 ino_key_init(c, &key, new_inode->i_ino);
1381                 err = ubifs_tnc_add(c, &key, lnum, offs, ilen, hash_new_inode);
1382                 if (err)
1383                         goto out_ro;
1384                 offs += ALIGN(ilen, 8);
1385         }
1386 
1387         ino_key_init(c, &key, old_dir->i_ino);
1388         err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_old_dir);
1389         if (err)
1390                 goto out_ro;
1391 
1392         if (move) {
1393                 offs += ALIGN(plen, 8);
1394                 ino_key_init(c, &key, new_dir->i_ino);
1395                 err = ubifs_tnc_add(c, &key, lnum, offs, plen, hash_new_dir);
1396                 if (err)
1397                         goto out_ro;
1398         }
1399 
1400         finish_reservation(c);
1401         if (new_inode) {
1402                 mark_inode_clean(c, new_ui);
1403                 spin_lock(&new_ui->ui_lock);
1404                 new_ui->synced_i_size = new_ui->ui_size;
1405                 spin_unlock(&new_ui->ui_lock);
1406         }
1407         mark_inode_clean(c, ubifs_inode(old_dir));
1408         if (move)
1409                 mark_inode_clean(c, ubifs_inode(new_dir));
1410         kfree(dent);
1411         return 0;
1412 
1413 out_release:
1414         release_head(c, BASEHD);
1415 out_ro:
1416         ubifs_ro_mode(c, err);
1417         if (last_reference)
1418                 ubifs_delete_orphan(c, new_inode->i_ino);
1419 out_finish:
1420         finish_reservation(c);
1421 out_free:
1422         kfree(dent);
1423         return err;
1424 }
1425 
1426 /**
1427  * truncate_data_node - re-compress/encrypt a truncated data node.
1428  * @c: UBIFS file-system description object
1429  * @inode: inode which referes to the data node
1430  * @block: data block number
1431  * @dn: data node to re-compress
1432  * @new_len: new length
1433  *
1434  * This function is used when an inode is truncated and the last data node of
1435  * the inode has to be re-compressed/encrypted and re-written.
1436  */
1437 static int truncate_data_node(const struct ubifs_info *c, const struct inode *inode,
1438                               unsigned int block, struct ubifs_data_node *dn,
1439                               int *new_len)
1440 {
1441         void *buf;
1442         int err, dlen, compr_type, out_len, old_dlen;
1443 
1444         out_len = le32_to_cpu(dn->size);
1445         buf = kmalloc_array(out_len, WORST_COMPR_FACTOR, GFP_NOFS);
1446         if (!buf)
1447                 return -ENOMEM;
1448 
1449         dlen = old_dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
1450         compr_type = le16_to_cpu(dn->compr_type);
1451 
1452         if (ubifs_crypt_is_encrypted(inode)) {
1453                 err = ubifs_decrypt(inode, dn, &dlen, block);
1454                 if (err)
1455                         goto out;
1456         }
1457 
1458         if (compr_type == UBIFS_COMPR_NONE) {
1459                 out_len = *new_len;
1460         } else {
1461                 err = ubifs_decompress(c, &dn->data, dlen, buf, &out_len, compr_type);
1462                 if (err)
1463                         goto out;
1464 
1465                 ubifs_compress(c, buf, *new_len, &dn->data, &out_len, &compr_type);
1466         }
1467 
1468         if (ubifs_crypt_is_encrypted(inode)) {
1469                 err = ubifs_encrypt(inode, dn, out_len, &old_dlen, block);
1470                 if (err)
1471                         goto out;
1472 
1473                 out_len = old_dlen;
1474         } else {
1475                 dn->compr_size = 0;
1476         }
1477 
1478         ubifs_assert(c, out_len <= UBIFS_BLOCK_SIZE);
1479         dn->compr_type = cpu_to_le16(compr_type);
1480         dn->size = cpu_to_le32(*new_len);
1481         *new_len = UBIFS_DATA_NODE_SZ + out_len;
1482         err = 0;
1483 out:
1484         kfree(buf);
1485         return err;
1486 }
1487 
1488 /**
1489  * ubifs_jnl_truncate - update the journal for a truncation.
1490  * @c: UBIFS file-system description object
1491  * @inode: inode to truncate
1492  * @old_size: old size
1493  * @new_size: new size
1494  *
1495  * When the size of a file decreases due to truncation, a truncation node is
1496  * written, the journal tree is updated, and the last data block is re-written
1497  * if it has been affected. The inode is also updated in order to synchronize
1498  * the new inode size.
1499  *
1500  * This function marks the inode as clean and returns zero on success. In case
1501  * of failure, a negative error code is returned.
1502  */
1503 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
1504                        loff_t old_size, loff_t new_size)
1505 {
1506         union ubifs_key key, to_key;
1507         struct ubifs_ino_node *ino;
1508         struct ubifs_trun_node *trun;
1509         struct ubifs_data_node *uninitialized_var(dn);
1510         int err, dlen, len, lnum, offs, bit, sz, sync = IS_SYNC(inode);
1511         struct ubifs_inode *ui = ubifs_inode(inode);
1512         ino_t inum = inode->i_ino;
1513         unsigned int blk;
1514         u8 hash_ino[UBIFS_HASH_ARR_SZ];
1515         u8 hash_dn[UBIFS_HASH_ARR_SZ];
1516 
1517         dbg_jnl("ino %lu, size %lld -> %lld",
1518                 (unsigned long)inum, old_size, new_size);
1519         ubifs_assert(c, !ui->data_len);
1520         ubifs_assert(c, S_ISREG(inode->i_mode));
1521         ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
1522 
1523         sz = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ +
1524              UBIFS_MAX_DATA_NODE_SZ * WORST_COMPR_FACTOR;
1525 
1526         sz += ubifs_auth_node_sz(c);
1527 
1528         ino = kmalloc(sz, GFP_NOFS);
1529         if (!ino)
1530                 return -ENOMEM;
1531 
1532         trun = (void *)ino + UBIFS_INO_NODE_SZ;
1533         trun->ch.node_type = UBIFS_TRUN_NODE;
1534         trun->inum = cpu_to_le32(inum);
1535         trun->old_size = cpu_to_le64(old_size);
1536         trun->new_size = cpu_to_le64(new_size);
1537         zero_trun_node_unused(trun);
1538 
1539         dlen = new_size & (UBIFS_BLOCK_SIZE - 1);
1540         if (dlen) {
1541                 /* Get last data block so it can be truncated */
1542                 dn = (void *)trun + UBIFS_TRUN_NODE_SZ;
1543                 blk = new_size >> UBIFS_BLOCK_SHIFT;
1544                 data_key_init(c, &key, inum, blk);
1545                 dbg_jnlk(&key, "last block key ");
1546                 err = ubifs_tnc_lookup(c, &key, dn);
1547                 if (err == -ENOENT)
1548                         dlen = 0; /* Not found (so it is a hole) */
1549                 else if (err)
1550                         goto out_free;
1551                 else {
1552                         int dn_len = le32_to_cpu(dn->size);
1553 
1554                         if (dn_len <= 0 || dn_len > UBIFS_BLOCK_SIZE) {
1555                                 ubifs_err(c, "bad data node (block %u, inode %lu)",
1556                                           blk, inode->i_ino);
1557                                 ubifs_dump_node(c, dn);
1558                                 goto out_free;
1559                         }
1560 
1561                         if (dn_len <= dlen)
1562                                 dlen = 0; /* Nothing to do */
1563                         else {
1564                                 err = truncate_data_node(c, inode, blk, dn, &dlen);
1565                                 if (err)
1566                                         goto out_free;
1567                         }
1568                 }
1569         }
1570 
1571         /* Must make reservation before allocating sequence numbers */
1572         len = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ;
1573 
1574         if (ubifs_authenticated(c))
1575                 len += ALIGN(dlen, 8) + ubifs_auth_node_sz(c);
1576         else
1577                 len += dlen;
1578 
1579         err = make_reservation(c, BASEHD, len);
1580         if (err)
1581                 goto out_free;
1582 
1583         pack_inode(c, ino, inode, 0);
1584         err = ubifs_node_calc_hash(c, ino, hash_ino);
1585         if (err)
1586                 goto out_release;
1587 
1588         ubifs_prep_grp_node(c, trun, UBIFS_TRUN_NODE_SZ, dlen ? 0 : 1);
1589         if (dlen) {
1590                 ubifs_prep_grp_node(c, dn, dlen, 1);
1591                 err = ubifs_node_calc_hash(c, dn, hash_dn);
1592                 if (err)
1593                         goto out_release;
1594         }
1595 
1596         err = write_head(c, BASEHD, ino, len, &lnum, &offs, sync);
1597         if (err)
1598                 goto out_release;
1599         if (!sync)
1600                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, inum);
1601         release_head(c, BASEHD);
1602 
1603         ubifs_add_auth_dirt(c, lnum);
1604 
1605         if (dlen) {
1606                 sz = offs + UBIFS_INO_NODE_SZ + UBIFS_TRUN_NODE_SZ;
1607                 err = ubifs_tnc_add(c, &key, lnum, sz, dlen, hash_dn);
1608                 if (err)
1609                         goto out_ro;
1610         }
1611 
1612         ino_key_init(c, &key, inum);
1613         err = ubifs_tnc_add(c, &key, lnum, offs, UBIFS_INO_NODE_SZ, hash_ino);
1614         if (err)
1615                 goto out_ro;
1616 
1617         err = ubifs_add_dirt(c, lnum, UBIFS_TRUN_NODE_SZ);
1618         if (err)
1619                 goto out_ro;
1620 
1621         bit = new_size & (UBIFS_BLOCK_SIZE - 1);
1622         blk = (new_size >> UBIFS_BLOCK_SHIFT) + (bit ? 1 : 0);
1623         data_key_init(c, &key, inum, blk);
1624 
1625         bit = old_size & (UBIFS_BLOCK_SIZE - 1);
1626         blk = (old_size >> UBIFS_BLOCK_SHIFT) - (bit ? 0 : 1);
1627         data_key_init(c, &to_key, inum, blk);
1628 
1629         err = ubifs_tnc_remove_range(c, &key, &to_key);
1630         if (err)
1631                 goto out_ro;
1632 
1633         finish_reservation(c);
1634         spin_lock(&ui->ui_lock);
1635         ui->synced_i_size = ui->ui_size;
1636         spin_unlock(&ui->ui_lock);
1637         mark_inode_clean(c, ui);
1638         kfree(ino);
1639         return 0;
1640 
1641 out_release:
1642         release_head(c, BASEHD);
1643 out_ro:
1644         ubifs_ro_mode(c, err);
1645         finish_reservation(c);
1646 out_free:
1647         kfree(ino);
1648         return err;
1649 }
1650 
1651 
1652 /**
1653  * ubifs_jnl_delete_xattr - delete an extended attribute.
1654  * @c: UBIFS file-system description object
1655  * @host: host inode
1656  * @inode: extended attribute inode
1657  * @nm: extended attribute entry name
1658  *
1659  * This function delete an extended attribute which is very similar to
1660  * un-linking regular files - it writes a deletion xentry, a deletion inode and
1661  * updates the target inode. Returns zero in case of success and a negative
1662  * error code in case of failure.
1663  */
1664 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
1665                            const struct inode *inode,
1666                            const struct fscrypt_name *nm)
1667 {
1668         int err, xlen, hlen, len, lnum, xent_offs, aligned_xlen, write_len;
1669         struct ubifs_dent_node *xent;
1670         struct ubifs_ino_node *ino;
1671         union ubifs_key xent_key, key1, key2;
1672         int sync = IS_DIRSYNC(host);
1673         struct ubifs_inode *host_ui = ubifs_inode(host);
1674         u8 hash[UBIFS_HASH_ARR_SZ];
1675 
1676         ubifs_assert(c, inode->i_nlink == 0);
1677         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
1678 
1679         /*
1680          * Since we are deleting the inode, we do not bother to attach any data
1681          * to it and assume its length is %UBIFS_INO_NODE_SZ.
1682          */
1683         xlen = UBIFS_DENT_NODE_SZ + fname_len(nm) + 1;
1684         aligned_xlen = ALIGN(xlen, 8);
1685         hlen = host_ui->data_len + UBIFS_INO_NODE_SZ;
1686         len = aligned_xlen + UBIFS_INO_NODE_SZ + ALIGN(hlen, 8);
1687 
1688         write_len = len + ubifs_auth_node_sz(c);
1689 
1690         xent = kzalloc(write_len, GFP_NOFS);
1691         if (!xent)
1692                 return -ENOMEM;
1693 
1694         /* Make reservation before allocating sequence numbers */
1695         err = make_reservation(c, BASEHD, write_len);
1696         if (err) {
1697                 kfree(xent);
1698                 return err;
1699         }
1700 
1701         xent->ch.node_type = UBIFS_XENT_NODE;
1702         xent_key_init(c, &xent_key, host->i_ino, nm);
1703         key_write(c, &xent_key, xent->key);
1704         xent->inum = 0;
1705         xent->type = get_dent_type(inode->i_mode);
1706         xent->nlen = cpu_to_le16(fname_len(nm));
1707         memcpy(xent->name, fname_name(nm), fname_len(nm));
1708         xent->name[fname_len(nm)] = '\0';
1709         zero_dent_node_unused(xent);
1710         ubifs_prep_grp_node(c, xent, xlen, 0);
1711 
1712         ino = (void *)xent + aligned_xlen;
1713         pack_inode(c, ino, inode, 0);
1714         ino = (void *)ino + UBIFS_INO_NODE_SZ;
1715         pack_inode(c, ino, host, 1);
1716         err = ubifs_node_calc_hash(c, ino, hash);
1717         if (err)
1718                 goto out_release;
1719 
1720         err = write_head(c, BASEHD, xent, write_len, &lnum, &xent_offs, sync);
1721         if (!sync && !err)
1722                 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, host->i_ino);
1723         release_head(c, BASEHD);
1724 
1725         ubifs_add_auth_dirt(c, lnum);
1726         kfree(xent);
1727         if (err)
1728                 goto out_ro;
1729 
1730         /* Remove the extended attribute entry from TNC */
1731         err = ubifs_tnc_remove_nm(c, &xent_key, nm);
1732         if (err)
1733                 goto out_ro;
1734         err = ubifs_add_dirt(c, lnum, xlen);
1735         if (err)
1736                 goto out_ro;
1737 
1738         /*
1739          * Remove all nodes belonging to the extended attribute inode from TNC.
1740          * Well, there actually must be only one node - the inode itself.
1741          */
1742         lowest_ino_key(c, &key1, inode->i_ino);
1743         highest_ino_key(c, &key2, inode->i_ino);
1744         err = ubifs_tnc_remove_range(c, &key1, &key2);
1745         if (err)
1746                 goto out_ro;
1747         err = ubifs_add_dirt(c, lnum, UBIFS_INO_NODE_SZ);
1748         if (err)
1749                 goto out_ro;
1750 
1751         /* And update TNC with the new host inode position */
1752         ino_key_init(c, &key1, host->i_ino);
1753         err = ubifs_tnc_add(c, &key1, lnum, xent_offs + len - hlen, hlen, hash);
1754         if (err)
1755                 goto out_ro;
1756 
1757         finish_reservation(c);
1758         spin_lock(&host_ui->ui_lock);
1759         host_ui->synced_i_size = host_ui->ui_size;
1760         spin_unlock(&host_ui->ui_lock);
1761         mark_inode_clean(c, host_ui);
1762         return 0;
1763 
1764 out_release:
1765         kfree(xent);
1766         release_head(c, BASEHD);
1767 out_ro:
1768         ubifs_ro_mode(c, err);
1769         finish_reservation(c);
1770         return err;
1771 }
1772 
1773 /**
1774  * ubifs_jnl_change_xattr - change an extended attribute.
1775  * @c: UBIFS file-system description object
1776  * @inode: extended attribute inode
1777  * @host: host inode
1778  *
1779  * This function writes the updated version of an extended attribute inode and
1780  * the host inode to the journal (to the base head). The host inode is written
1781  * after the extended attribute inode in order to guarantee that the extended
1782  * attribute will be flushed when the inode is synchronized by 'fsync()' and
1783  * consequently, the write-buffer is synchronized. This function returns zero
1784  * in case of success and a negative error code in case of failure.
1785  */
1786 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode,
1787                            const struct inode *host)
1788 {
1789         int err, len1, len2, aligned_len, aligned_len1, lnum, offs;
1790         struct ubifs_inode *host_ui = ubifs_inode(host);
1791         struct ubifs_ino_node *ino;
1792         union ubifs_key key;
1793         int sync = IS_DIRSYNC(host);
1794         u8 hash_host[UBIFS_HASH_ARR_SZ];
1795         u8 hash[UBIFS_HASH_ARR_SZ];
1796 
1797         dbg_jnl("ino %lu, ino %lu", host->i_ino, inode->i_ino);
1798         ubifs_assert(c, host->i_nlink > 0);
1799         ubifs_assert(c, inode->i_nlink > 0);
1800         ubifs_assert(c, mutex_is_locked(&host_ui->ui_mutex));
1801 
1802         len1 = UBIFS_INO_NODE_SZ + host_ui->data_len;
1803         len2 = UBIFS_INO_NODE_SZ + ubifs_inode(inode)->data_len;
1804         aligned_len1 = ALIGN(len1, 8);
1805         aligned_len = aligned_len1 + ALIGN(len2, 8);
1806 
1807         aligned_len += ubifs_auth_node_sz(c);
1808 
1809         ino = kzalloc(aligned_len, GFP_NOFS);
1810         if (!ino)
1811                 return -ENOMEM;
1812 
1813         /* Make reservation before allocating sequence numbers */
1814         err = make_reservation(c, BASEHD, aligned_len);
1815         if (err)
1816                 goto out_free;
1817 
1818         pack_inode(c, ino, host, 0);
1819         err = ubifs_node_calc_hash(c, ino, hash_host);
1820         if (err)
1821                 goto out_release;
1822         pack_inode(c, (void *)ino + aligned_len1, inode, 1);
1823         err = ubifs_node_calc_hash(c, (void *)ino + aligned_len1, hash);
1824         if (err)
1825                 goto out_release;
1826 
1827         err = write_head(c, BASEHD, ino, aligned_len, &lnum, &offs, 0);
1828         if (!sync && !err) {
1829                 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1830 
1831                 ubifs_wbuf_add_ino_nolock(wbuf, host->i_ino);
1832                 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
1833         }
1834         release_head(c, BASEHD);
1835         if (err)
1836                 goto out_ro;
1837 
1838         ubifs_add_auth_dirt(c, lnum);
1839 
1840         ino_key_init(c, &key, host->i_ino);
1841         err = ubifs_tnc_add(c, &key, lnum, offs, len1, hash_host);
1842         if (err)
1843                 goto out_ro;
1844 
1845         ino_key_init(c, &key, inode->i_ino);
1846         err = ubifs_tnc_add(c, &key, lnum, offs + aligned_len1, len2, hash);
1847         if (err)
1848                 goto out_ro;
1849 
1850         finish_reservation(c);
1851         spin_lock(&host_ui->ui_lock);
1852         host_ui->synced_i_size = host_ui->ui_size;
1853         spin_unlock(&host_ui->ui_lock);
1854         mark_inode_clean(c, host_ui);
1855         kfree(ino);
1856         return 0;
1857 
1858 out_release:
1859         release_head(c, BASEHD);
1860 out_ro:
1861         ubifs_ro_mode(c, err);
1862         finish_reservation(c);
1863 out_free:
1864         kfree(ino);
1865         return err;
1866 }
1867
/* [<][>][^][v][top][bottom][index][help] */
root/fs/ubifs/journal.c

DEFINITIONS
