2 * This file is part of UBIFS.
4 * Copyright (C) 2006-2008 Nokia Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
24 * This file implements UBIFS journal.
26 * The journal consists of 2 parts - the log and bud LEBs. The log has fixed
27 * length and position, while a bud logical eraseblock is any LEB in the main
28 * area. Buds contain file system data - data nodes, inode nodes, etc. The log
29 * contains only references to buds and some other stuff like commit
30 * start node. The idea is that when we commit the journal, we do
31 * not copy the data, the buds just become indexed. Since after the commit the
32 * nodes in bud eraseblocks become leaf nodes of the file system index tree, we
33 * use term "bud". Analogy is obvious, bud eraseblocks contain nodes which will
34 * become leafs in the future.
36 * The journal is multi-headed because we want to write data to the journal as
37 * optimally as possible. It is nice to have nodes belonging to the same inode
38 * in one LEB, so we may write data owned by different inodes to different
39 * journal heads, although at present only one data head is used.
41 * For recovery reasons, the base head contains all inode nodes, all directory
42 * entry nodes and all truncate nodes. This means that the other heads contain
45 * Bud LEBs may be half-indexed. For example, if the bud was not full at the
46 * time of commit, the bud is retained to continue to be used in the journal,
47 * even though the "front" of the LEB is now indexed. In that case, the log
48 * reference contains the offset where the bud starts for the purposes of the
51 * The journal size has to be limited, because the larger is the journal, the
52 * longer it takes to mount UBIFS (scanning the journal) and the more memory it
53 * takes (indexing in the TNC).
55 * All the journal write operations like 'ubifs_jnl_update()' here, which write
56 * multiple UBIFS nodes to the journal at one go, are atomic with respect to
57 * unclean reboots. Should the unclean reboot happen, the recovery code drops
64 * zero_ino_node_unused - zero out unused fields of an on-flash inode node.
65 * @ino: the inode to zero out
67 static inline void zero_ino_node_unused(struct ubifs_ino_node *ino)
69 memset(ino->padding1, 0, 4);
70 memset(ino->padding2, 0, 26);
74 * zero_dent_node_unused - zero out unused fields of an on-flash directory
76 * @dent: the directory entry to zero out
78 static inline void zero_dent_node_unused(struct ubifs_dent_node *dent)
81 memset(dent->padding2, 0, 4);
85 * zero_trun_node_unused - zero out unused fields of an on-flash truncation
87 * @trun: the truncation node to zero out
89 static inline void zero_trun_node_unused(struct ubifs_trun_node *trun)
91 memset(trun->padding, 0, 12);
95 * reserve_space - reserve space in the journal.
96 * @c: UBIFS file-system description object
97 * @jhead: journal head number
100 * This function reserves space in journal head @head. If the reservation
101 * succeeded, the journal head stays locked and later has to be unlocked using
102 * 'release_head()'. 'write_node()' and 'write_head()' functions also unlock
103 * it. Returns zero in case of success, %-EAGAIN if commit has to be done, and
104 * other negative error codes in case of other failures.
106 static int reserve_space(struct ubifs_info *c, int jhead, int len)
108 int err = 0, err1, retries = 0, avail, lnum, offs, squeeze;
109 struct ubifs_wbuf *wbuf = &c->jheads[jhead].wbuf;
112 * Typically, the base head has smaller nodes written to it, so it is
113 * better to try to allocate space at the ends of eraseblocks. This is
114 * what the squeeze parameter does.
116 ubifs_assert(!c->ro_media && !c->ro_mount);
117 squeeze = (jhead == BASEHD);
119 mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
126 avail = c->leb_size - wbuf->offs - wbuf->used;
127 if (wbuf->lnum != -1 && avail >= len)
131 * Write buffer wasn't seek'ed or there is no enough space - look for an
132 * LEB with some empty space.
134 lnum = ubifs_find_free_space(c, len, &offs, squeeze);
143 * No free space, we have to run garbage collector to make
144 * some. But the write-buffer mutex has to be unlocked because
147 dbg_jnl("no free space in jhead %s, run GC", dbg_jhead(jhead));
148 mutex_unlock(&wbuf->io_mutex);
150 lnum = ubifs_garbage_collect(c, 0);
157 * GC could not make a free LEB. But someone else may
158 * have allocated new bud for this journal head,
159 * because we dropped @wbuf->io_mutex, so try once
162 dbg_jnl("GC couldn't make a free LEB for jhead %s",
165 dbg_jnl("retry (%d)", retries);
169 dbg_jnl("return -ENOSPC");
173 mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
174 dbg_jnl("got LEB %d for jhead %s", lnum, dbg_jhead(jhead));
175 avail = c->leb_size - wbuf->offs - wbuf->used;
177 if (wbuf->lnum != -1 && avail >= len) {
179 * Someone else has switched the journal head and we have
180 * enough space now. This happens when more than one process is
181 * trying to write to the same journal head at the same time.
183 dbg_jnl("return LEB %d back, already have LEB %d:%d",
184 lnum, wbuf->lnum, wbuf->offs + wbuf->used);
185 err = ubifs_return_leb(c, lnum);
195 * Make sure we synchronize the write-buffer before we add the new bud
196 * to the log. Otherwise we may have a power cut after the log
197 * reference node for the last bud (@lnum) is written but before the
198 * write-buffer data are written to the next-to-last bud
199 * (@wbuf->lnum). And the effect would be that the recovery would see
200 * that there is corruption in the next-to-last bud.
202 err = ubifs_wbuf_sync_nolock(wbuf);
205 err = ubifs_add_bud_to_log(c, jhead, lnum, offs);
208 err = ubifs_wbuf_seek_nolock(wbuf, lnum, offs);
215 mutex_unlock(&wbuf->io_mutex);
219 /* An error occurred and the LEB has to be returned to lprops */
220 ubifs_assert(err < 0);
221 err1 = ubifs_return_leb(c, lnum);
222 if (err1 && err == -EAGAIN)
224 * Return original error code only if it is not %-EAGAIN,
225 * which is not really an error. Otherwise, return the error
226 * code of 'ubifs_return_leb()'.
229 mutex_unlock(&wbuf->io_mutex);
234 * write_node - write node to a journal head.
235 * @c: UBIFS file-system description object
236 * @jhead: journal head
237 * @node: node to write
239 * @lnum: LEB number written is returned here
240 * @offs: offset written is returned here
242 * This function writes a node to reserved space of journal head @jhead.
243 * Returns zero in case of success and a negative error code in case of
246 static int write_node(struct ubifs_info *c, int jhead, void *node, int len,
247 int *lnum, int *offs)
249 struct ubifs_wbuf *wbuf = &c->jheads[jhead].wbuf;
251 ubifs_assert(jhead != GCHD);
253 *lnum = c->jheads[jhead].wbuf.lnum;
254 *offs = c->jheads[jhead].wbuf.offs + c->jheads[jhead].wbuf.used;
256 dbg_jnl("jhead %s, LEB %d:%d, len %d",
257 dbg_jhead(jhead), *lnum, *offs, len);
258 ubifs_prepare_node(c, node, len, 0);
260 return ubifs_wbuf_write_nolock(wbuf, node, len);
264 * write_head - write data to a journal head.
265 * @c: UBIFS file-system description object
266 * @jhead: journal head
267 * @buf: buffer to write
268 * @len: length to write
269 * @lnum: LEB number written is returned here
270 * @offs: offset written is returned here
271 * @sync: non-zero if the write-buffer has to by synchronized
273 * This function is the same as 'write_node()' but it does not assume the
274 * buffer it is writing is a node, so it does not prepare it (which means
275 * initializing common header and calculating CRC).
277 static int write_head(struct ubifs_info *c, int jhead, void *buf, int len,
278 int *lnum, int *offs, int sync)
281 struct ubifs_wbuf *wbuf = &c->jheads[jhead].wbuf;
283 ubifs_assert(jhead != GCHD);
285 *lnum = c->jheads[jhead].wbuf.lnum;
286 *offs = c->jheads[jhead].wbuf.offs + c->jheads[jhead].wbuf.used;
287 dbg_jnl("jhead %s, LEB %d:%d, len %d",
288 dbg_jhead(jhead), *lnum, *offs, len);
290 err = ubifs_wbuf_write_nolock(wbuf, buf, len);
294 err = ubifs_wbuf_sync_nolock(wbuf);
299 * make_reservation - reserve journal space.
300 * @c: UBIFS file-system description object
301 * @jhead: journal head
302 * @len: how many bytes to reserve
304 * This function makes space reservation in journal head @jhead. The function
305 * takes the commit lock and locks the journal head, and the caller has to
306 * unlock the head and finish the reservation with 'finish_reservation()'.
307 * Returns zero in case of success and a negative error code in case of
310 * Note, the journal head may be unlocked as soon as the data is written, while
311 * the commit lock has to be released after the data has been added to the
314 static int make_reservation(struct ubifs_info *c, int jhead, int len)
316 int err, cmt_retries = 0, nospc_retries = 0;
319 down_read(&c->commit_sem);
320 err = reserve_space(c, jhead, len);
323 up_read(&c->commit_sem);
325 if (err == -ENOSPC) {
327 * GC could not make any progress. We should try to commit
328 * once because it could make some dirty space and GC would
329 * make progress, so make the error -EAGAIN so that the below
330 * will commit and re-try.
332 if (nospc_retries++ < 2) {
333 dbg_jnl("no space, retry");
338 * This means that the budgeting is incorrect. We always have
339 * to be able to write to the media, because all operations are
340 * budgeted. Deletions are not budgeted, though, but we reserve
341 * an extra LEB for them.
349 * -EAGAIN means that the journal is full or too large, or the above
350 * code wants to do one commit. Do this and re-try.
352 if (cmt_retries > 128) {
354 * This should not happen unless the journal size limitations
357 ubifs_err(c, "stuck in space allocation");
360 } else if (cmt_retries > 32)
361 ubifs_warn(c, "too many space allocation re-tries (%d)",
364 dbg_jnl("-EAGAIN, commit and retry (retried %d times)",
368 err = ubifs_run_commit(c);
374 ubifs_err(c, "cannot reserve %d bytes in jhead %d, error %d",
376 if (err == -ENOSPC) {
377 /* This are some budgeting problems, print useful information */
378 down_write(&c->commit_sem);
380 ubifs_dump_budg(c, &c->bi);
381 ubifs_dump_lprops(c);
382 cmt_retries = dbg_check_lprops(c);
383 up_write(&c->commit_sem);
389 * release_head - release a journal head.
390 * @c: UBIFS file-system description object
391 * @jhead: journal head
393 * This function releases journal head @jhead which was locked by
394 * the 'make_reservation()' function. It has to be called after each successful
395 * 'make_reservation()' invocation.
397 static inline void release_head(struct ubifs_info *c, int jhead)
399 mutex_unlock(&c->jheads[jhead].wbuf.io_mutex);
403 * finish_reservation - finish a reservation.
404 * @c: UBIFS file-system description object
406 * This function finishes journal space reservation. It must be called after
407 * 'make_reservation()'.
409 static void finish_reservation(struct ubifs_info *c)
411 up_read(&c->commit_sem);
415 * get_dent_type - translate VFS inode mode to UBIFS directory entry type.
418 static int get_dent_type(int mode)
420 switch (mode & S_IFMT) {
422 return UBIFS_ITYPE_REG;
424 return UBIFS_ITYPE_DIR;
426 return UBIFS_ITYPE_LNK;
428 return UBIFS_ITYPE_BLK;
430 return UBIFS_ITYPE_CHR;
432 return UBIFS_ITYPE_FIFO;
434 return UBIFS_ITYPE_SOCK;
442 * pack_inode - pack an inode node.
443 * @c: UBIFS file-system description object
444 * @ino: buffer in which to pack inode node
445 * @inode: inode to pack
446 * @last: indicates the last node of the group
448 static void pack_inode(struct ubifs_info *c, struct ubifs_ino_node *ino,
449 const struct inode *inode, int last)
451 int data_len = 0, last_reference = !inode->i_nlink;
452 struct ubifs_inode *ui = ubifs_inode(inode);
454 ino->ch.node_type = UBIFS_INO_NODE;
455 ino_key_init_flash(c, &ino->key, inode->i_ino);
456 ino->creat_sqnum = cpu_to_le64(ui->creat_sqnum);
457 ino->atime_sec = cpu_to_le64(inode->i_atime.tv_sec);
458 ino->atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
459 ino->ctime_sec = cpu_to_le64(inode->i_ctime.tv_sec);
460 ino->ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
461 ino->mtime_sec = cpu_to_le64(inode->i_mtime.tv_sec);
462 ino->mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
463 ino->uid = cpu_to_le32(i_uid_read(inode));
464 ino->gid = cpu_to_le32(i_gid_read(inode));
465 ino->mode = cpu_to_le32(inode->i_mode);
466 ino->flags = cpu_to_le32(ui->flags);
467 ino->size = cpu_to_le64(ui->ui_size);
468 ino->nlink = cpu_to_le32(inode->i_nlink);
469 ino->compr_type = cpu_to_le16(ui->compr_type);
470 ino->data_len = cpu_to_le32(ui->data_len);
471 ino->xattr_cnt = cpu_to_le32(ui->xattr_cnt);
472 ino->xattr_size = cpu_to_le32(ui->xattr_size);
473 ino->xattr_names = cpu_to_le32(ui->xattr_names);
474 zero_ino_node_unused(ino);
477 * Drop the attached data if this is a deletion inode, the data is not
480 if (!last_reference) {
481 memcpy(ino->data, ui->data, ui->data_len);
482 data_len = ui->data_len;
485 ubifs_prep_grp_node(c, ino, UBIFS_INO_NODE_SZ + data_len, last);
489 * mark_inode_clean - mark UBIFS inode as clean.
490 * @c: UBIFS file-system description object
491 * @ui: UBIFS inode to mark as clean
493 * This helper function marks UBIFS inode @ui as clean by cleaning the
494 * @ui->dirty flag and releasing its budget. Note, VFS may still treat the
495 * inode as dirty and try to write it back, but 'ubifs_write_inode()' would
498 static void mark_inode_clean(struct ubifs_info *c, struct ubifs_inode *ui)
501 ubifs_release_dirty_inode_budget(c, ui);
506 * ubifs_jnl_update - update inode.
507 * @c: UBIFS file-system description object
508 * @dir: parent inode or host inode in case of extended attributes
509 * @nm: directory entry name
510 * @inode: inode to update
511 * @deletion: indicates a directory entry deletion i.e unlink or rmdir
512 * @xent: non-zero if the directory entry is an extended attribute entry
514 * This function updates an inode by writing a directory entry (or extended
515 * attribute entry), the inode itself, and the parent directory inode (or the
516 * host inode) to the journal.
518 * The function writes the host inode @dir last, which is important in case of
519 * extended attributes. Indeed, then we guarantee that if the host inode gets
520 * synchronized (with 'fsync()'), and the write-buffer it sits in gets flushed,
521 * the extended attribute inode gets flushed too. And this is exactly what the
522 * user expects - synchronizing the host inode synchronizes its extended
523 * attributes. Similarly, this guarantees that if @dir is synchronized, its
524 * directory entry corresponding to @nm gets synchronized too.
526 * If the inode (@inode) or the parent directory (@dir) are synchronous, this
527 * function synchronizes the write-buffer.
529 * This function marks the @dir and @inode inodes as clean and returns zero on
530 * success. In case of failure, a negative error code is returned.
532 int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
533 const struct qstr *nm, const struct inode *inode,
534 int deletion, int xent)
536 int err, dlen, ilen, len, lnum, ino_offs, dent_offs;
537 int aligned_dlen, aligned_ilen, sync = IS_DIRSYNC(dir);
538 int last_reference = !!(deletion && inode->i_nlink == 0);
539 struct ubifs_inode *ui = ubifs_inode(inode);
540 struct ubifs_inode *host_ui = ubifs_inode(dir);
541 struct ubifs_dent_node *dent;
542 struct ubifs_ino_node *ino;
543 union ubifs_key dent_key, ino_key;
545 dbg_jnl("ino %lu, dent '%.*s', data len %d in dir ino %lu",
546 inode->i_ino, nm->len, nm->name, ui->data_len, dir->i_ino);
547 ubifs_assert(mutex_is_locked(&host_ui->ui_mutex));
549 dlen = UBIFS_DENT_NODE_SZ + nm->len + 1;
550 ilen = UBIFS_INO_NODE_SZ;
553 * If the last reference to the inode is being deleted, then there is
554 * no need to attach and write inode data, it is being deleted anyway.
555 * And if the inode is being deleted, no need to synchronize
556 * write-buffer even if the inode is synchronous.
558 if (!last_reference) {
559 ilen += ui->data_len;
560 sync |= IS_SYNC(inode);
563 aligned_dlen = ALIGN(dlen, 8);
564 aligned_ilen = ALIGN(ilen, 8);
566 len = aligned_dlen + aligned_ilen + UBIFS_INO_NODE_SZ;
567 /* Make sure to also account for extended attributes */
568 len += host_ui->data_len;
570 dent = kmalloc(len, GFP_NOFS);
574 /* Make reservation before allocating sequence numbers */
575 err = make_reservation(c, BASEHD, len);
580 dent->ch.node_type = UBIFS_DENT_NODE;
581 dent_key_init(c, &dent_key, dir->i_ino, nm);
583 dent->ch.node_type = UBIFS_XENT_NODE;
584 xent_key_init(c, &dent_key, dir->i_ino, nm);
587 key_write(c, &dent_key, dent->key);
588 dent->inum = deletion ? 0 : cpu_to_le64(inode->i_ino);
589 dent->type = get_dent_type(inode->i_mode);
590 dent->nlen = cpu_to_le16(nm->len);
591 memcpy(dent->name, nm->name, nm->len);
592 dent->name[nm->len] = '\0';
593 zero_dent_node_unused(dent);
594 ubifs_prep_grp_node(c, dent, dlen, 0);
596 ino = (void *)dent + aligned_dlen;
597 pack_inode(c, ino, inode, 0);
598 ino = (void *)ino + aligned_ilen;
599 pack_inode(c, ino, dir, 1);
601 if (last_reference) {
602 err = ubifs_add_orphan(c, inode->i_ino);
604 release_head(c, BASEHD);
607 ui->del_cmtno = c->cmt_no;
610 err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, sync);
614 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
616 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
617 ubifs_wbuf_add_ino_nolock(wbuf, dir->i_ino);
619 release_head(c, BASEHD);
623 err = ubifs_tnc_remove_nm(c, &dent_key, nm);
626 err = ubifs_add_dirt(c, lnum, dlen);
628 err = ubifs_tnc_add_nm(c, &dent_key, lnum, dent_offs, dlen, nm);
633 * Note, we do not remove the inode from TNC even if the last reference
634 * to it has just been deleted, because the inode may still be opened.
635 * Instead, the inode has been added to orphan lists and the orphan
636 * subsystem will take further care about it.
638 ino_key_init(c, &ino_key, inode->i_ino);
639 ino_offs = dent_offs + aligned_dlen;
640 err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs, ilen);
644 ino_key_init(c, &ino_key, dir->i_ino);
645 ino_offs += aligned_ilen;
646 err = ubifs_tnc_add(c, &ino_key, lnum, ino_offs,
647 UBIFS_INO_NODE_SZ + host_ui->data_len);
651 finish_reservation(c);
652 spin_lock(&ui->ui_lock);
653 ui->synced_i_size = ui->ui_size;
654 spin_unlock(&ui->ui_lock);
655 mark_inode_clean(c, ui);
656 mark_inode_clean(c, host_ui);
660 finish_reservation(c);
666 release_head(c, BASEHD);
669 ubifs_ro_mode(c, err);
671 ubifs_delete_orphan(c, inode->i_ino);
672 finish_reservation(c);
677 * ubifs_jnl_write_data - write a data node to the journal.
678 * @c: UBIFS file-system description object
679 * @inode: inode the data node belongs to
681 * @buf: buffer to write
682 * @len: data length (must not exceed %UBIFS_BLOCK_SIZE)
684 * This function writes a data node to the journal. Returns %0 if the data node
685 * was successfully written, and a negative error code in case of failure.
687 int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
688 const union ubifs_key *key, const void *buf, int len)
690 struct ubifs_data_node *data;
691 int err, lnum, offs, compr_type, out_len, compr_len;
692 int dlen = COMPRESSED_DATA_NODE_BUF_SZ, allocated = 1;
693 struct ubifs_inode *ui = ubifs_inode(inode);
694 bool encrypted = ubifs_crypt_is_encrypted(inode);
696 dbg_jnlk(key, "ino %lu, blk %u, len %d, key ",
697 (unsigned long)key_inum(c, key), key_block(c, key), len);
698 ubifs_assert(len <= UBIFS_BLOCK_SIZE);
701 dlen += UBIFS_CIPHER_BLOCK_SIZE;
703 data = kmalloc(dlen, GFP_NOFS | __GFP_NOWARN);
706 * Fall-back to the write reserve buffer. Note, we might be
707 * currently on the memory reclaim path, when the kernel is
708 * trying to free some memory by writing out dirty pages. The
709 * write reserve buffer helps us to guarantee that we are
710 * always able to write the data.
713 mutex_lock(&c->write_reserve_mutex);
714 data = c->write_reserve_buf;
717 data->ch.node_type = UBIFS_DATA_NODE;
718 key_write(c, key, &data->key);
719 data->size = cpu_to_le32(len);
721 if (!(ui->flags & UBIFS_COMPR_FL))
722 /* Compression is disabled for this inode */
723 compr_type = UBIFS_COMPR_NONE;
725 compr_type = ui->compr_type;
727 out_len = compr_len = dlen - UBIFS_DATA_NODE_SZ;
728 ubifs_compress(c, buf, len, &data->data, &compr_len, &compr_type);
729 ubifs_assert(compr_len <= UBIFS_BLOCK_SIZE);
732 err = ubifs_encrypt(inode, data, compr_len, &out_len, key_block(c, key));
737 data->compr_size = 0;
740 dlen = UBIFS_DATA_NODE_SZ + out_len;
741 data->compr_type = cpu_to_le16(compr_type);
743 /* Make reservation before allocating sequence numbers */
744 err = make_reservation(c, DATAHD, dlen);
748 err = write_node(c, DATAHD, data, dlen, &lnum, &offs);
751 ubifs_wbuf_add_ino_nolock(&c->jheads[DATAHD].wbuf, key_inum(c, key));
752 release_head(c, DATAHD);
754 err = ubifs_tnc_add(c, key, lnum, offs, dlen);
758 finish_reservation(c);
760 mutex_unlock(&c->write_reserve_mutex);
766 release_head(c, DATAHD);
768 ubifs_ro_mode(c, err);
769 finish_reservation(c);
772 mutex_unlock(&c->write_reserve_mutex);
779 * ubifs_jnl_write_inode - flush inode to the journal.
780 * @c: UBIFS file-system description object
781 * @inode: inode to flush
783 * This function writes inode @inode to the journal. If the inode is
784 * synchronous, it also synchronizes the write-buffer. Returns zero in case of
785 * success and a negative error code in case of failure.
787 int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
790 struct ubifs_ino_node *ino;
791 struct ubifs_inode *ui = ubifs_inode(inode);
792 int sync = 0, len = UBIFS_INO_NODE_SZ, last_reference = !inode->i_nlink;
794 dbg_jnl("ino %lu, nlink %u", inode->i_ino, inode->i_nlink);
797 * If the inode is being deleted, do not write the attached data. No
798 * need to synchronize the write-buffer either.
800 if (!last_reference) {
802 sync = IS_SYNC(inode);
804 ino = kmalloc(len, GFP_NOFS);
808 /* Make reservation before allocating sequence numbers */
809 err = make_reservation(c, BASEHD, len);
813 pack_inode(c, ino, inode, 1);
814 err = write_head(c, BASEHD, ino, len, &lnum, &offs, sync);
818 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
820 release_head(c, BASEHD);
822 if (last_reference) {
823 err = ubifs_tnc_remove_ino(c, inode->i_ino);
826 ubifs_delete_orphan(c, inode->i_ino);
827 err = ubifs_add_dirt(c, lnum, len);
831 ino_key_init(c, &key, inode->i_ino);
832 err = ubifs_tnc_add(c, &key, lnum, offs, len);
837 finish_reservation(c);
838 spin_lock(&ui->ui_lock);
839 ui->synced_i_size = ui->ui_size;
840 spin_unlock(&ui->ui_lock);
845 release_head(c, BASEHD);
847 ubifs_ro_mode(c, err);
848 finish_reservation(c);
855 * ubifs_jnl_delete_inode - delete an inode.
856 * @c: UBIFS file-system description object
857 * @inode: inode to delete
859 * This function deletes inode @inode which includes removing it from orphans,
860 * deleting it from TNC and, in some cases, writing a deletion inode to the
863 * When regular file inodes are unlinked or a directory inode is removed, the
864 * 'ubifs_jnl_update()' function writes a corresponding deletion inode and
865 * direntry to the media, and adds the inode to orphans. After this, when the
866 * last reference to this inode has been dropped, this function is called. In
867 * general, it has to write one more deletion inode to the media, because if
868 * a commit happened between 'ubifs_jnl_update()' and
869 * 'ubifs_jnl_delete_inode()', the deletion inode is not in the journal
870 * anymore, and in fact it might not be on the flash anymore, because it might
871 * have been garbage-collected already. And for optimization reasons UBIFS does
872 * not read the orphan area if it has been unmounted cleanly, so it would have
873 * no indication in the journal that there is a deleted inode which has to be
876 * However, if there was no commit between 'ubifs_jnl_update()' and
877 * 'ubifs_jnl_delete_inode()', then there is no need to write the deletion
878 * inode to the media for the second time. And this is quite a typical case.
880 * This function returns zero in case of success and a negative error code in
883 int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode)
886 struct ubifs_inode *ui = ubifs_inode(inode);
888 ubifs_assert(inode->i_nlink == 0);
890 if (ui->del_cmtno != c->cmt_no)
891 /* A commit happened for sure */
892 return ubifs_jnl_write_inode(c, inode);
894 down_read(&c->commit_sem);
896 * Check commit number again, because the first test has been done
897 * without @c->commit_sem, so a commit might have happened.
899 if (ui->del_cmtno != c->cmt_no) {
900 up_read(&c->commit_sem);
901 return ubifs_jnl_write_inode(c, inode);
904 err = ubifs_tnc_remove_ino(c, inode->i_ino);
906 ubifs_ro_mode(c, err);
908 ubifs_delete_orphan(c, inode->i_ino);
909 up_read(&c->commit_sem);
914 * ubifs_jnl_xrename - cross rename two directory entries.
915 * @c: UBIFS file-system description object
916 * @fst_dir: parent inode of 1st directory entry to exchange
917 * @fst_dentry: 1st directory entry to exchange
918 * @snd_dir: parent inode of 2nd directory entry to exchange
919 * @snd_dentry: 2nd directory entry to exchange
920 * @sync: non-zero if the write-buffer has to be synchronized
922 * This function implements the cross rename operation which may involve
923 * writing 2 inodes and 2 directory entries. It marks the written inodes as clean
924 * and returns zero on success. In case of failure, a negative error code is
927 int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
928 const struct dentry *fst_dentry,
929 const struct inode *snd_dir,
930 const struct dentry *snd_dentry, int sync)
933 struct ubifs_dent_node *dent1, *dent2;
934 int err, dlen1, dlen2, lnum, offs, len, plen = UBIFS_INO_NODE_SZ;
935 int aligned_dlen1, aligned_dlen2;
936 int twoparents = (fst_dir != snd_dir);
937 const struct inode *fst_inode = d_inode(fst_dentry);
938 const struct inode *snd_inode = d_inode(snd_dentry);
941 dbg_jnl("dent '%pd' in dir ino %lu between dent '%pd' in dir ino %lu",
942 fst_dentry, fst_dir->i_ino, snd_dentry, snd_dir->i_ino);
944 ubifs_assert(ubifs_inode(fst_dir)->data_len == 0);
945 ubifs_assert(ubifs_inode(snd_dir)->data_len == 0);
946 ubifs_assert(mutex_is_locked(&ubifs_inode(fst_dir)->ui_mutex));
947 ubifs_assert(mutex_is_locked(&ubifs_inode(snd_dir)->ui_mutex));
949 dlen1 = UBIFS_DENT_NODE_SZ + snd_dentry->d_name.len + 1;
950 dlen2 = UBIFS_DENT_NODE_SZ + fst_dentry->d_name.len + 1;
951 aligned_dlen1 = ALIGN(dlen1, 8);
952 aligned_dlen2 = ALIGN(dlen2, 8);
954 len = aligned_dlen1 + aligned_dlen2 + ALIGN(plen, 8);
958 dent1 = kmalloc(len, GFP_NOFS);
962 /* Make reservation before allocating sequence numbers */
963 err = make_reservation(c, BASEHD, len);
967 /* Make new dent for 1st entry */
968 dent1->ch.node_type = UBIFS_DENT_NODE;
969 dent_key_init_flash(c, &dent1->key, snd_dir->i_ino, &snd_dentry->d_name);
970 dent1->inum = cpu_to_le64(fst_inode->i_ino);
971 dent1->type = get_dent_type(fst_inode->i_mode);
972 dent1->nlen = cpu_to_le16(snd_dentry->d_name.len);
973 memcpy(dent1->name, snd_dentry->d_name.name, snd_dentry->d_name.len);
974 dent1->name[snd_dentry->d_name.len] = '\0';
975 zero_dent_node_unused(dent1);
976 ubifs_prep_grp_node(c, dent1, dlen1, 0);
978 /* Make new dent for 2nd entry */
979 dent2 = (void *)dent1 + aligned_dlen1;
980 dent2->ch.node_type = UBIFS_DENT_NODE;
981 dent_key_init_flash(c, &dent2->key, fst_dir->i_ino, &fst_dentry->d_name);
982 dent2->inum = cpu_to_le64(snd_inode->i_ino);
983 dent2->type = get_dent_type(snd_inode->i_mode);
984 dent2->nlen = cpu_to_le16(fst_dentry->d_name.len);
985 memcpy(dent2->name, fst_dentry->d_name.name, fst_dentry->d_name.len);
986 dent2->name[fst_dentry->d_name.len] = '\0';
987 zero_dent_node_unused(dent2);
988 ubifs_prep_grp_node(c, dent2, dlen2, 0);
990 p = (void *)dent2 + aligned_dlen2;
992 pack_inode(c, p, fst_dir, 1);
994 pack_inode(c, p, fst_dir, 0);
996 pack_inode(c, p, snd_dir, 1);
999 err = write_head(c, BASEHD, dent1, len, &lnum, &offs, sync);
1003 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1005 ubifs_wbuf_add_ino_nolock(wbuf, fst_dir->i_ino);
1006 ubifs_wbuf_add_ino_nolock(wbuf, snd_dir->i_ino);
1008 release_head(c, BASEHD);
1010 dent_key_init(c, &key, snd_dir->i_ino, &snd_dentry->d_name);
1011 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, &snd_dentry->d_name);
1015 offs += aligned_dlen1;
1016 dent_key_init(c, &key, fst_dir->i_ino, &fst_dentry->d_name);
1017 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, &fst_dentry->d_name);
1021 offs += aligned_dlen2;
1023 ino_key_init(c, &key, fst_dir->i_ino);
1024 err = ubifs_tnc_add(c, &key, lnum, offs, plen);
1029 offs += ALIGN(plen, 8);
1030 ino_key_init(c, &key, snd_dir->i_ino);
1031 err = ubifs_tnc_add(c, &key, lnum, offs, plen);
1036 finish_reservation(c);
1038 mark_inode_clean(c, ubifs_inode(fst_dir));
1040 mark_inode_clean(c, ubifs_inode(snd_dir));
1045 release_head(c, BASEHD);
1047 ubifs_ro_mode(c, err);
1048 finish_reservation(c);
1055 * ubifs_jnl_rename - rename a directory entry.
1056 * @c: UBIFS file-system description object
1057 * @old_dir: parent inode of directory entry to rename
1058 * @old_dentry: directory entry to rename
1059 * @new_dir: parent inode of directory entry to rename
1060 * @new_dentry: new directory entry (or directory entry to replace)
1061 * @sync: non-zero if the write-buffer has to be synchronized
1063 * This function implements the re-name operation which may involve writing up
1064 * to 4 inodes and 2 directory entries. It marks the written inodes as clean
1065 * and returns zero on success. In case of failure, a negative error code is
1068 int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
1069 const struct dentry *old_dentry,
1070 const struct inode *new_dir,
1071 const struct dentry *new_dentry,
1072 const struct inode *whiteout, int sync)
1075 union ubifs_key key;
1076 struct ubifs_dent_node *dent, *dent2;
1077 int err, dlen1, dlen2, ilen, lnum, offs, len;
1078 const struct inode *old_inode = d_inode(old_dentry);
1079 const struct inode *new_inode = d_inode(new_dentry);
1080 int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ;
1081 int last_reference = !!(new_inode && new_inode->i_nlink == 0);
1082 int move = (old_dir != new_dir);
1083 struct ubifs_inode *uninitialized_var(new_ui);
1085 dbg_jnl("dent '%pd' in dir ino %lu to dent '%pd' in dir ino %lu",
1086 old_dentry, old_dir->i_ino, new_dentry, new_dir->i_ino);
1087 ubifs_assert(ubifs_inode(old_dir)->data_len == 0);
1088 ubifs_assert(ubifs_inode(new_dir)->data_len == 0);
1089 ubifs_assert(mutex_is_locked(&ubifs_inode(old_dir)->ui_mutex));
1090 ubifs_assert(mutex_is_locked(&ubifs_inode(new_dir)->ui_mutex));
1092 dlen1 = UBIFS_DENT_NODE_SZ + new_dentry->d_name.len + 1;
1093 dlen2 = UBIFS_DENT_NODE_SZ + old_dentry->d_name.len + 1;
1095 new_ui = ubifs_inode(new_inode);
1096 ubifs_assert(mutex_is_locked(&new_ui->ui_mutex));
1097 ilen = UBIFS_INO_NODE_SZ;
1098 if (!last_reference)
1099 ilen += new_ui->data_len;
1103 aligned_dlen1 = ALIGN(dlen1, 8);
1104 aligned_dlen2 = ALIGN(dlen2, 8);
1105 len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + ALIGN(plen, 8);
1108 dent = kmalloc(len, GFP_NOFS);
1112 /* Make reservation before allocating sequence numbers */
1113 err = make_reservation(c, BASEHD, len);
1118 dent->ch.node_type = UBIFS_DENT_NODE;
1119 dent_key_init_flash(c, &dent->key, new_dir->i_ino, &new_dentry->d_name);
1120 dent->inum = cpu_to_le64(old_inode->i_ino);
1121 dent->type = get_dent_type(old_inode->i_mode);
1122 dent->nlen = cpu_to_le16(new_dentry->d_name.len);
1123 memcpy(dent->name, new_dentry->d_name.name, new_dentry->d_name.len);
1124 dent->name[new_dentry->d_name.len] = '\0';
1125 zero_dent_node_unused(dent);
1126 ubifs_prep_grp_node(c, dent, dlen1, 0);
1128 dent2 = (void *)dent + aligned_dlen1;
1129 dent2->ch.node_type = UBIFS_DENT_NODE;
1130 dent_key_init_flash(c, &dent2->key, old_dir->i_ino,
1131 &old_dentry->d_name);
1134 dent2->inum = cpu_to_le64(whiteout->i_ino);
1135 dent2->type = get_dent_type(whiteout->i_mode);
1137 /* Make deletion dent */
1139 dent2->type = DT_UNKNOWN;
1141 dent2->nlen = cpu_to_le16(old_dentry->d_name.len);
1142 memcpy(dent2->name, old_dentry->d_name.name, old_dentry->d_name.len);
1143 dent2->name[old_dentry->d_name.len] = '\0';
1144 zero_dent_node_unused(dent2);
1145 ubifs_prep_grp_node(c, dent2, dlen2, 0);
1147 p = (void *)dent2 + aligned_dlen2;
1149 pack_inode(c, p, new_inode, 0);
1150 p += ALIGN(ilen, 8);
1154 pack_inode(c, p, old_dir, 1);
1156 pack_inode(c, p, old_dir, 0);
1157 p += ALIGN(plen, 8);
1158 pack_inode(c, p, new_dir, 1);
1161 if (last_reference) {
1162 err = ubifs_add_orphan(c, new_inode->i_ino);
1164 release_head(c, BASEHD);
1167 new_ui->del_cmtno = c->cmt_no;
1170 err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync);
1174 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1176 ubifs_wbuf_add_ino_nolock(wbuf, new_dir->i_ino);
1177 ubifs_wbuf_add_ino_nolock(wbuf, old_dir->i_ino);
1179 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf,
1182 release_head(c, BASEHD);
1184 dent_key_init(c, &key, new_dir->i_ino, &new_dentry->d_name);
1185 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, &new_dentry->d_name);
1189 offs += aligned_dlen1;
1191 dent_key_init(c, &key, old_dir->i_ino, &old_dentry->d_name);
1192 err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, &old_dentry->d_name);
1196 ubifs_delete_orphan(c, whiteout->i_ino);
1198 err = ubifs_add_dirt(c, lnum, dlen2);
1202 dent_key_init(c, &key, old_dir->i_ino, &old_dentry->d_name);
1203 err = ubifs_tnc_remove_nm(c, &key, &old_dentry->d_name);
1208 offs += aligned_dlen2;
1210 ino_key_init(c, &key, new_inode->i_ino);
1211 err = ubifs_tnc_add(c, &key, lnum, offs, ilen);
1214 offs += ALIGN(ilen, 8);
1217 ino_key_init(c, &key, old_dir->i_ino);
1218 err = ubifs_tnc_add(c, &key, lnum, offs, plen);
1223 offs += ALIGN(plen, 8);
1224 ino_key_init(c, &key, new_dir->i_ino);
1225 err = ubifs_tnc_add(c, &key, lnum, offs, plen);
1230 finish_reservation(c);
1232 mark_inode_clean(c, new_ui);
1233 spin_lock(&new_ui->ui_lock);
1234 new_ui->synced_i_size = new_ui->ui_size;
1235 spin_unlock(&new_ui->ui_lock);
1237 mark_inode_clean(c, ubifs_inode(old_dir));
1239 mark_inode_clean(c, ubifs_inode(new_dir));
1244 release_head(c, BASEHD);
1246 ubifs_ro_mode(c, err);
1248 ubifs_delete_orphan(c, new_inode->i_ino);
1250 finish_reservation(c);
1257 * truncate_data_node - re-compress/encrypt a truncated data node.
1258 * @c: UBIFS file-system description object
1259 * @inode: inode which referes to the data node
1260 * @block: data block number
1261 * @dn: data node to re-compress
1262 * @new_len: new length
1264 * This function is used when an inode is truncated and the last data node of
1265 * the inode has to be re-compressed/encrypted and re-written.
1267 static int truncate_data_node(const struct ubifs_info *c, const struct inode *inode,
1268 unsigned int block, struct ubifs_data_node *dn,
1272 int err, dlen, compr_type, out_len, old_dlen;
1274 out_len = le32_to_cpu(dn->size);
1275 buf = kmalloc(out_len * WORST_COMPR_FACTOR, GFP_NOFS);
1279 dlen = old_dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
1280 compr_type = le16_to_cpu(dn->compr_type);
1282 if (ubifs_crypt_is_encrypted(inode)) {
1283 err = ubifs_decrypt(inode, dn, &dlen, block);
1288 if (compr_type != UBIFS_COMPR_NONE) {
1289 err = ubifs_decompress(c, &dn->data, dlen, buf, &out_len, compr_type);
1293 ubifs_compress(c, buf, *new_len, &dn->data, &out_len, &compr_type);
1296 if (ubifs_crypt_is_encrypted(inode)) {
1297 err = ubifs_encrypt(inode, dn, out_len, &old_dlen, block);
1306 ubifs_assert(out_len <= UBIFS_BLOCK_SIZE);
1307 dn->compr_type = cpu_to_le16(compr_type);
1308 dn->size = cpu_to_le32(*new_len);
1309 *new_len = UBIFS_DATA_NODE_SZ + out_len;
1316 * ubifs_jnl_truncate - update the journal for a truncation.
1317 * @c: UBIFS file-system description object
1318 * @inode: inode to truncate
1319 * @old_size: old size
1320 * @new_size: new size
1322 * When the size of a file decreases due to truncation, a truncation node is
1323 * written, the journal tree is updated, and the last data block is re-written
1324 * if it has been affected. The inode is also updated in order to synchronize
1325 * the new inode size.
1327 * This function marks the inode as clean and returns zero on success. In case
1328 * of failure, a negative error code is returned.
1330 int ubifs_jnl_truncate(struct ubifs_info *c, const struct inode *inode,
1331 loff_t old_size, loff_t new_size)
1333 union ubifs_key key, to_key;
1334 struct ubifs_ino_node *ino;
1335 struct ubifs_trun_node *trun;
1336 struct ubifs_data_node *uninitialized_var(dn);
1337 int err, dlen, len, lnum, offs, bit, sz, sync = IS_SYNC(inode);
1338 struct ubifs_inode *ui = ubifs_inode(inode);
1339 ino_t inum = inode->i_ino;
1342 dbg_jnl("ino %lu, size %lld -> %lld",
1343 (unsigned long)inum, old_size, new_size);
1344 ubifs_assert(!ui->data_len);
1345 ubifs_assert(S_ISREG(inode->i_mode));
1346 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
1348 sz = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ +
1349 UBIFS_MAX_DATA_NODE_SZ * WORST_COMPR_FACTOR;
1350 ino = kmalloc(sz, GFP_NOFS);
1354 trun = (void *)ino + UBIFS_INO_NODE_SZ;
1355 trun->ch.node_type = UBIFS_TRUN_NODE;
1356 trun->inum = cpu_to_le32(inum);
1357 trun->old_size = cpu_to_le64(old_size);
1358 trun->new_size = cpu_to_le64(new_size);
1359 zero_trun_node_unused(trun);
1361 dlen = new_size & (UBIFS_BLOCK_SIZE - 1);
1363 /* Get last data block so it can be truncated */
1364 dn = (void *)trun + UBIFS_TRUN_NODE_SZ;
1365 blk = new_size >> UBIFS_BLOCK_SHIFT;
1366 data_key_init(c, &key, inum, blk);
1367 dbg_jnlk(&key, "last block key ");
1368 err = ubifs_tnc_lookup(c, &key, dn);
1370 dlen = 0; /* Not found (so it is a hole) */
1374 if (le32_to_cpu(dn->size) <= dlen)
1375 dlen = 0; /* Nothing to do */
1377 err = truncate_data_node(c, inode, blk, dn, &dlen);
1384 /* Must make reservation before allocating sequence numbers */
1385 len = UBIFS_TRUN_NODE_SZ + UBIFS_INO_NODE_SZ;
1388 err = make_reservation(c, BASEHD, len);
1392 pack_inode(c, ino, inode, 0);
1393 ubifs_prep_grp_node(c, trun, UBIFS_TRUN_NODE_SZ, dlen ? 0 : 1);
1395 ubifs_prep_grp_node(c, dn, dlen, 1);
1397 err = write_head(c, BASEHD, ino, len, &lnum, &offs, sync);
1401 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, inum);
1402 release_head(c, BASEHD);
1405 sz = offs + UBIFS_INO_NODE_SZ + UBIFS_TRUN_NODE_SZ;
1406 err = ubifs_tnc_add(c, &key, lnum, sz, dlen);
1411 ino_key_init(c, &key, inum);
1412 err = ubifs_tnc_add(c, &key, lnum, offs, UBIFS_INO_NODE_SZ);
1416 err = ubifs_add_dirt(c, lnum, UBIFS_TRUN_NODE_SZ);
1420 bit = new_size & (UBIFS_BLOCK_SIZE - 1);
1421 blk = (new_size >> UBIFS_BLOCK_SHIFT) + (bit ? 1 : 0);
1422 data_key_init(c, &key, inum, blk);
1424 bit = old_size & (UBIFS_BLOCK_SIZE - 1);
1425 blk = (old_size >> UBIFS_BLOCK_SHIFT) - (bit ? 0 : 1);
1426 data_key_init(c, &to_key, inum, blk);
1428 err = ubifs_tnc_remove_range(c, &key, &to_key);
1432 finish_reservation(c);
1433 spin_lock(&ui->ui_lock);
1434 ui->synced_i_size = ui->ui_size;
1435 spin_unlock(&ui->ui_lock);
1436 mark_inode_clean(c, ui);
1441 release_head(c, BASEHD);
1443 ubifs_ro_mode(c, err);
1444 finish_reservation(c);
1452 * ubifs_jnl_delete_xattr - delete an extended attribute.
1453 * @c: UBIFS file-system description object
1455 * @inode: extended attribute inode
1456 * @nm: extended attribute entry name
1458 * This function delete an extended attribute which is very similar to
1459 * un-linking regular files - it writes a deletion xentry, a deletion inode and
1460 * updates the target inode. Returns zero in case of success and a negative
1461 * error code in case of failure.
1463 int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
1464 const struct inode *inode, const struct qstr *nm)
1466 int err, xlen, hlen, len, lnum, xent_offs, aligned_xlen;
1467 struct ubifs_dent_node *xent;
1468 struct ubifs_ino_node *ino;
1469 union ubifs_key xent_key, key1, key2;
1470 int sync = IS_DIRSYNC(host);
1471 struct ubifs_inode *host_ui = ubifs_inode(host);
1473 dbg_jnl("host %lu, xattr ino %lu, name '%s', data len %d",
1474 host->i_ino, inode->i_ino, nm->name,
1475 ubifs_inode(inode)->data_len);
1476 ubifs_assert(inode->i_nlink == 0);
1477 ubifs_assert(mutex_is_locked(&host_ui->ui_mutex));
1480 * Since we are deleting the inode, we do not bother to attach any data
1481 * to it and assume its length is %UBIFS_INO_NODE_SZ.
1483 xlen = UBIFS_DENT_NODE_SZ + nm->len + 1;
1484 aligned_xlen = ALIGN(xlen, 8);
1485 hlen = host_ui->data_len + UBIFS_INO_NODE_SZ;
1486 len = aligned_xlen + UBIFS_INO_NODE_SZ + ALIGN(hlen, 8);
1488 xent = kmalloc(len, GFP_NOFS);
1492 /* Make reservation before allocating sequence numbers */
1493 err = make_reservation(c, BASEHD, len);
1499 xent->ch.node_type = UBIFS_XENT_NODE;
1500 xent_key_init(c, &xent_key, host->i_ino, nm);
1501 key_write(c, &xent_key, xent->key);
1503 xent->type = get_dent_type(inode->i_mode);
1504 xent->nlen = cpu_to_le16(nm->len);
1505 memcpy(xent->name, nm->name, nm->len);
1506 xent->name[nm->len] = '\0';
1507 zero_dent_node_unused(xent);
1508 ubifs_prep_grp_node(c, xent, xlen, 0);
1510 ino = (void *)xent + aligned_xlen;
1511 pack_inode(c, ino, inode, 0);
1512 ino = (void *)ino + UBIFS_INO_NODE_SZ;
1513 pack_inode(c, ino, host, 1);
1515 err = write_head(c, BASEHD, xent, len, &lnum, &xent_offs, sync);
1517 ubifs_wbuf_add_ino_nolock(&c->jheads[BASEHD].wbuf, host->i_ino);
1518 release_head(c, BASEHD);
1523 /* Remove the extended attribute entry from TNC */
1524 err = ubifs_tnc_remove_nm(c, &xent_key, nm);
1527 err = ubifs_add_dirt(c, lnum, xlen);
1532 * Remove all nodes belonging to the extended attribute inode from TNC.
1533 * Well, there actually must be only one node - the inode itself.
1535 lowest_ino_key(c, &key1, inode->i_ino);
1536 highest_ino_key(c, &key2, inode->i_ino);
1537 err = ubifs_tnc_remove_range(c, &key1, &key2);
1540 err = ubifs_add_dirt(c, lnum, UBIFS_INO_NODE_SZ);
1544 /* And update TNC with the new host inode position */
1545 ino_key_init(c, &key1, host->i_ino);
1546 err = ubifs_tnc_add(c, &key1, lnum, xent_offs + len - hlen, hlen);
1550 finish_reservation(c);
1551 spin_lock(&host_ui->ui_lock);
1552 host_ui->synced_i_size = host_ui->ui_size;
1553 spin_unlock(&host_ui->ui_lock);
1554 mark_inode_clean(c, host_ui);
1558 ubifs_ro_mode(c, err);
1559 finish_reservation(c);
1564 * ubifs_jnl_change_xattr - change an extended attribute.
1565 * @c: UBIFS file-system description object
1566 * @inode: extended attribute inode
1569 * This function writes the updated version of an extended attribute inode and
1570 * the host inode to the journal (to the base head). The host inode is written
1571 * after the extended attribute inode in order to guarantee that the extended
1572 * attribute will be flushed when the inode is synchronized by 'fsync()' and
1573 * consequently, the write-buffer is synchronized. This function returns zero
1574 * in case of success and a negative error code in case of failure.
1576 int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode,
1577 const struct inode *host)
1579 int err, len1, len2, aligned_len, aligned_len1, lnum, offs;
1580 struct ubifs_inode *host_ui = ubifs_inode(host);
1581 struct ubifs_ino_node *ino;
1582 union ubifs_key key;
1583 int sync = IS_DIRSYNC(host);
1585 dbg_jnl("ino %lu, ino %lu", host->i_ino, inode->i_ino);
1586 ubifs_assert(host->i_nlink > 0);
1587 ubifs_assert(inode->i_nlink > 0);
1588 ubifs_assert(mutex_is_locked(&host_ui->ui_mutex));
1590 len1 = UBIFS_INO_NODE_SZ + host_ui->data_len;
1591 len2 = UBIFS_INO_NODE_SZ + ubifs_inode(inode)->data_len;
1592 aligned_len1 = ALIGN(len1, 8);
1593 aligned_len = aligned_len1 + ALIGN(len2, 8);
1595 ino = kmalloc(aligned_len, GFP_NOFS);
1599 /* Make reservation before allocating sequence numbers */
1600 err = make_reservation(c, BASEHD, aligned_len);
1604 pack_inode(c, ino, host, 0);
1605 pack_inode(c, (void *)ino + aligned_len1, inode, 1);
1607 err = write_head(c, BASEHD, ino, aligned_len, &lnum, &offs, 0);
1608 if (!sync && !err) {
1609 struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
1611 ubifs_wbuf_add_ino_nolock(wbuf, host->i_ino);
1612 ubifs_wbuf_add_ino_nolock(wbuf, inode->i_ino);
1614 release_head(c, BASEHD);
1618 ino_key_init(c, &key, host->i_ino);
1619 err = ubifs_tnc_add(c, &key, lnum, offs, len1);
1623 ino_key_init(c, &key, inode->i_ino);
1624 err = ubifs_tnc_add(c, &key, lnum, offs + aligned_len1, len2);
1628 finish_reservation(c);
1629 spin_lock(&host_ui->ui_lock);
1630 host_ui->synced_i_size = host_ui->ui_size;
1631 spin_unlock(&host_ui->ui_lock);
1632 mark_inode_clean(c, host_ui);
1637 ubifs_ro_mode(c, err);
1638 finish_reservation(c);