Lines Matching +full:- +full:c
1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2006-2008 Nokia Corporation.
6 * Copyright (C) 2006, 2007 University of Szeged, Hungary
14 * This file implements UBIFS I/O subsystem which provides various I/O-related
16 * write-buffering support. Write buffers help to save space which otherwise
18 * Instead, data first goes to the write-buffer and is flushed when the
22 * UBIFS distinguishes between minimum write size (@c->min_io_size) and maximum
23 * write size (@c->max_write_size). The latter is the maximum amount of bytes
25 * @c->max_write_size units should presumably be faster. Obviously,
26 * @c->min_io_size <= @c->max_write_size. Write-buffers are of
27 * @c->max_write_size bytes in size for maximum performance. However, when a
28 * write-buffer is flushed, only the portion of it (aligned to @c->min_io_size
29 * boundary) which contains data is written, not the whole write-buffer,
30 * because this is more space-efficient.
33 * hand, we want to write in optimal @c->max_write_size bytes chunks, which
34 * also means aligning writes at the @c->max_write_size bytes offsets. On the
37 * the next write offset to be not aligned to @c->max_write_size bytes. So the
38 * have to make sure that the write-buffer offset (@wbuf->offs) becomes aligned
39 * to @c->max_write_size bytes again. We do this by temporarily shrinking
40 * write-buffer size (@wbuf->size).
42 * Write-buffers are defined by 'struct ubifs_wbuf' objects and protected by
43 * mutexes defined inside these objects. Since sometimes upper-level code
44 * has to lock the write-buffer (e.g. journal space reservation code), many
45 * functions related to write-buffers have "nolock" suffix which means that the
46 * caller has to lock the write-buffer before calling this function.
48 * UBIFS stores nodes at 64 bit-aligned addresses. If the node length is not
66 * ubifs_ro_mode - switch UBIFS to read read-only mode.
67 * @c: UBIFS file-system description object
70 void ubifs_ro_mode(struct ubifs_info *c, int err) in ubifs_ro_mode() argument
72 if (!c->ro_error) { in ubifs_ro_mode()
73 c->ro_error = 1; in ubifs_ro_mode()
74 c->no_chk_data_crc = 0; in ubifs_ro_mode()
75 c->vfs_sb->s_flags |= SB_RDONLY; in ubifs_ro_mode()
76 ubifs_warn(c, "switched to read-only mode, error %d", err); in ubifs_ro_mode()
87 int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs, in ubifs_leb_read() argument
92 err = ubi_read(c->ubi, lnum, buf, offs, len); in ubifs_leb_read()
94 * In case of %-EBADMSG print the error message only if the in ubifs_leb_read()
97 if (err && (err != -EBADMSG || even_ebadmsg)) { in ubifs_leb_read()
98 ubifs_err(c, "reading %d bytes from LEB %d:%d failed, error %d", in ubifs_leb_read()
105 int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs, in ubifs_leb_write() argument
110 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_leb_write()
111 if (c->ro_error) in ubifs_leb_write()
112 return -EROFS; in ubifs_leb_write()
113 if (!dbg_is_tst_rcvry(c)) in ubifs_leb_write()
114 err = ubi_leb_write(c->ubi, lnum, buf, offs, len); in ubifs_leb_write()
116 err = dbg_leb_write(c, lnum, buf, offs, len); in ubifs_leb_write()
118 ubifs_err(c, "writing %d bytes to LEB %d:%d failed, error %d", in ubifs_leb_write()
120 ubifs_ro_mode(c, err); in ubifs_leb_write()
126 int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len) in ubifs_leb_change() argument
130 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_leb_change()
131 if (c->ro_error) in ubifs_leb_change()
132 return -EROFS; in ubifs_leb_change()
133 if (!dbg_is_tst_rcvry(c)) in ubifs_leb_change()
134 err = ubi_leb_change(c->ubi, lnum, buf, len); in ubifs_leb_change()
136 err = dbg_leb_change(c, lnum, buf, len); in ubifs_leb_change()
138 ubifs_err(c, "changing %d bytes in LEB %d failed, error %d", in ubifs_leb_change()
140 ubifs_ro_mode(c, err); in ubifs_leb_change()
146 int ubifs_leb_unmap(struct ubifs_info *c, int lnum) in ubifs_leb_unmap() argument
150 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_leb_unmap()
151 if (c->ro_error) in ubifs_leb_unmap()
152 return -EROFS; in ubifs_leb_unmap()
153 if (!dbg_is_tst_rcvry(c)) in ubifs_leb_unmap()
154 err = ubi_leb_unmap(c->ubi, lnum); in ubifs_leb_unmap()
156 err = dbg_leb_unmap(c, lnum); in ubifs_leb_unmap()
158 ubifs_err(c, "unmap LEB %d failed, error %d", lnum, err); in ubifs_leb_unmap()
159 ubifs_ro_mode(c, err); in ubifs_leb_unmap()
165 int ubifs_leb_map(struct ubifs_info *c, int lnum) in ubifs_leb_map() argument
169 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_leb_map()
170 if (c->ro_error) in ubifs_leb_map()
171 return -EROFS; in ubifs_leb_map()
172 if (!dbg_is_tst_rcvry(c)) in ubifs_leb_map()
173 err = ubi_leb_map(c->ubi, lnum); in ubifs_leb_map()
175 err = dbg_leb_map(c, lnum); in ubifs_leb_map()
177 ubifs_err(c, "mapping LEB %d failed, error %d", lnum, err); in ubifs_leb_map()
178 ubifs_ro_mode(c, err); in ubifs_leb_map()
184 int ubifs_is_mapped(const struct ubifs_info *c, int lnum) in ubifs_is_mapped() argument
188 err = ubi_is_mapped(c->ubi, lnum); in ubifs_is_mapped()
190 ubifs_err(c, "ubi_is_mapped failed for LEB %d, error %d", in ubifs_is_mapped()
200 stats->magic_errors++; in record_magic_error()
206 stats->node_errors++; in record_node_error()
212 stats->crc_errors++; in record_crc_error()
216 * ubifs_check_node - check node.
217 * @c: UBIFS file-system description object
227 * feeds it a file-system image with incorrect nodes. For example, too large
231 * This function may skip data nodes CRC checking if @c->no_chk_data_crc is
233 * @must_chk_crc is true, then @c->no_chk_data_crc is ignored and CRC is
234 * checked. Similarly, if @c->mounting or @c->remounting_rw is true (we are
235 * mounting or re-mounting to R/W mode), @c->no_chk_data_crc is ignored and CRC
236 * is checked. This is because during mounting or re-mounting from R/O mode to
241 * This function returns zero in case of success and %-EUCLEAN in case of bad
244 int ubifs_check_node(const struct ubifs_info *c, const void *buf, int len, in ubifs_check_node() argument
247 int err = -EINVAL, type, node_len; in ubifs_check_node()
251 ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt && offs >= 0); in ubifs_check_node()
252 ubifs_assert(c, !(offs & 7) && offs < c->leb_size); in ubifs_check_node()
254 magic = le32_to_cpu(ch->magic); in ubifs_check_node()
257 ubifs_err(c, "bad magic %#08x, expected %#08x", in ubifs_check_node()
259 record_magic_error(c->stats); in ubifs_check_node()
260 err = -EUCLEAN; in ubifs_check_node()
264 type = ch->node_type; in ubifs_check_node()
267 ubifs_err(c, "bad node type %d", type); in ubifs_check_node()
268 record_node_error(c->stats); in ubifs_check_node()
272 node_len = le32_to_cpu(ch->len); in ubifs_check_node()
273 if (node_len + offs > c->leb_size) in ubifs_check_node()
276 if (c->ranges[type].max_len == 0) { in ubifs_check_node()
277 if (node_len != c->ranges[type].len) in ubifs_check_node()
279 } else if (node_len < c->ranges[type].min_len || in ubifs_check_node()
280 node_len > c->ranges[type].max_len) in ubifs_check_node()
283 if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->mounting && in ubifs_check_node()
284 !c->remounting_rw && c->no_chk_data_crc) in ubifs_check_node()
287 crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8); in ubifs_check_node()
288 node_crc = le32_to_cpu(ch->crc); in ubifs_check_node()
291 ubifs_err(c, "bad CRC: calculated %#08x, read %#08x", in ubifs_check_node()
293 record_crc_error(c->stats); in ubifs_check_node()
294 err = -EUCLEAN; in ubifs_check_node()
302 ubifs_err(c, "bad node length %d", node_len); in ubifs_check_node()
305 ubifs_err(c, "bad node at LEB %d:%d", lnum, offs); in ubifs_check_node()
306 ubifs_dump_node(c, buf, len); in ubifs_check_node()
313 * ubifs_pad - pad flash space.
314 * @c: UBIFS file-system description object
318 * The flash media obliges us to write only in chunks of %c->min_io_size and
319 * when we have to write less data we add padding node to the write-buffer and
325 * Padding nodes are also used to fill gaps when the "commit-in-gaps" method is
328 void ubifs_pad(const struct ubifs_info *c, void *buf, int pad) in ubifs_pad() argument
330 ubifs_assert(c, pad >= 0); in ubifs_pad()
336 ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC); in ubifs_pad()
337 ch->node_type = UBIFS_PAD_NODE; in ubifs_pad()
338 ch->group_type = UBIFS_NO_NODE_GROUP; in ubifs_pad()
339 ch->padding[0] = ch->padding[1] = 0; in ubifs_pad()
340 ch->sqnum = 0; in ubifs_pad()
341 ch->len = cpu_to_le32(UBIFS_PAD_NODE_SZ); in ubifs_pad()
342 pad -= UBIFS_PAD_NODE_SZ; in ubifs_pad()
343 pad_node->pad_len = cpu_to_le32(pad); in ubifs_pad()
352 * next_sqnum - get next sequence number.
353 * @c: UBIFS file-system description object
355 static unsigned long long next_sqnum(struct ubifs_info *c) in next_sqnum() argument
359 spin_lock(&c->cnt_lock); in next_sqnum()
360 sqnum = ++c->max_sqnum; in next_sqnum()
361 spin_unlock(&c->cnt_lock); in next_sqnum()
365 ubifs_err(c, "sequence number overflow %llu, end of life", in next_sqnum()
367 ubifs_ro_mode(c, -EINVAL); in next_sqnum()
369 ubifs_warn(c, "running out of sequence numbers, end of life soon"); in next_sqnum()
375 void ubifs_init_node(struct ubifs_info *c, void *node, int len, int pad) in ubifs_init_node() argument
378 unsigned long long sqnum = next_sqnum(c); in ubifs_init_node()
380 ubifs_assert(c, len >= UBIFS_CH_SZ); in ubifs_init_node()
382 ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC); in ubifs_init_node()
383 ch->len = cpu_to_le32(len); in ubifs_init_node()
384 ch->group_type = UBIFS_NO_NODE_GROUP; in ubifs_init_node()
385 ch->sqnum = cpu_to_le64(sqnum); in ubifs_init_node()
386 ch->padding[0] = ch->padding[1] = 0; in ubifs_init_node()
390 pad = ALIGN(len, c->min_io_size) - len; in ubifs_init_node()
391 ubifs_pad(c, node + len, pad); in ubifs_init_node()
400 crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8); in ubifs_crc_node()
401 ch->crc = cpu_to_le32(crc); in ubifs_crc_node()
405 * ubifs_prepare_node_hmac - prepare node to be written to flash.
406 * @c: UBIFS file-system description object
412 * This function prepares node at @node to be written to the media - it
419 int ubifs_prepare_node_hmac(struct ubifs_info *c, void *node, int len, in ubifs_prepare_node_hmac() argument
424 ubifs_init_node(c, node, len, pad); in ubifs_prepare_node_hmac()
427 err = ubifs_node_insert_hmac(c, node, len, hmac_offs); in ubifs_prepare_node_hmac()
438 * ubifs_prepare_node - prepare node to be written to flash.
439 * @c: UBIFS file-system description object
444 * This function prepares node at @node to be written to the media - it
448 void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad) in ubifs_prepare_node() argument
454 ubifs_prepare_node_hmac(c, node, len, 0, pad); in ubifs_prepare_node()
458 * ubifs_prep_grp_node - prepare node of a group to be written to flash.
459 * @c: UBIFS file-system description object
464 * This function prepares node at @node to be written to the media - it
467 void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last) in ubifs_prep_grp_node() argument
470 unsigned long long sqnum = next_sqnum(c); in ubifs_prep_grp_node()
472 ubifs_assert(c, len >= UBIFS_CH_SZ); in ubifs_prep_grp_node()
474 ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC); in ubifs_prep_grp_node()
475 ch->len = cpu_to_le32(len); in ubifs_prep_grp_node()
477 ch->group_type = UBIFS_LAST_OF_NODE_GROUP; in ubifs_prep_grp_node()
479 ch->group_type = UBIFS_IN_NODE_GROUP; in ubifs_prep_grp_node()
480 ch->sqnum = cpu_to_le64(sqnum); in ubifs_prep_grp_node()
481 ch->padding[0] = ch->padding[1] = 0; in ubifs_prep_grp_node()
486 * wbuf_timer_callback_nolock - write-buffer timer callback function.
487 * @timer: timer data (write-buffer descriptor)
489 * This function is called when the write-buffer timer expires.
495 dbg_io("jhead %s", dbg_jhead(wbuf->jhead)); in wbuf_timer_callback_nolock()
496 wbuf->need_sync = 1; in wbuf_timer_callback_nolock()
497 wbuf->c->need_wbuf_sync = 1; in wbuf_timer_callback_nolock()
498 ubifs_wake_up_bgt(wbuf->c); in wbuf_timer_callback_nolock()
503 * new_wbuf_timer_nolock - start new write-buffer timer.
504 * @c: UBIFS file-system description object
505 * @wbuf: write-buffer descriptor
507 static void new_wbuf_timer_nolock(struct ubifs_info *c, struct ubifs_wbuf *wbuf) in new_wbuf_timer_nolock() argument
515 ubifs_assert(c, !hrtimer_active(&wbuf->timer)); in new_wbuf_timer_nolock()
516 ubifs_assert(c, delta <= ULONG_MAX); in new_wbuf_timer_nolock()
518 if (wbuf->no_timer) in new_wbuf_timer_nolock()
520 dbg_io("set timer for jhead %s, %llu-%llu millisecs", in new_wbuf_timer_nolock()
521 dbg_jhead(wbuf->jhead), in new_wbuf_timer_nolock()
524 hrtimer_start_range_ns(&wbuf->timer, softlimit, delta, in new_wbuf_timer_nolock()
529 * cancel_wbuf_timer_nolock - cancel write-buffer timer.
530 * @wbuf: write-buffer descriptor
534 if (wbuf->no_timer) in cancel_wbuf_timer_nolock()
536 wbuf->need_sync = 0; in cancel_wbuf_timer_nolock()
537 hrtimer_cancel(&wbuf->timer); in cancel_wbuf_timer_nolock()
541 * ubifs_wbuf_sync_nolock - synchronize write-buffer.
542 * @wbuf: write-buffer to synchronize
544 * This function synchronizes write-buffer @buf and returns zero in case of
547 * Note, although write-buffers are of @c->max_write_size, this function does
548 * not necessarily writes all @c->max_write_size bytes to the flash. Instead,
549 * if the write-buffer is only partially filled with data, only the used part
550 * of the write-buffer (aligned on @c->min_io_size boundary) is synchronized.
555 struct ubifs_info *c = wbuf->c; in ubifs_wbuf_sync_nolock() local
559 if (!wbuf->used || wbuf->lnum == -1) in ubifs_wbuf_sync_nolock()
560 /* Write-buffer is empty or not seeked */ in ubifs_wbuf_sync_nolock()
564 wbuf->lnum, wbuf->offs, wbuf->used, dbg_jhead(wbuf->jhead)); in ubifs_wbuf_sync_nolock()
565 ubifs_assert(c, !(wbuf->avail & 7)); in ubifs_wbuf_sync_nolock()
566 ubifs_assert(c, wbuf->offs + wbuf->size <= c->leb_size); in ubifs_wbuf_sync_nolock()
567 ubifs_assert(c, wbuf->size >= c->min_io_size); in ubifs_wbuf_sync_nolock()
568 ubifs_assert(c, wbuf->size <= c->max_write_size); in ubifs_wbuf_sync_nolock()
569 ubifs_assert(c, wbuf->size % c->min_io_size == 0); in ubifs_wbuf_sync_nolock()
570 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_wbuf_sync_nolock()
571 if (c->leb_size - wbuf->offs >= c->max_write_size) in ubifs_wbuf_sync_nolock()
572 ubifs_assert(c, !((wbuf->offs + wbuf->size) % c->max_write_size)); in ubifs_wbuf_sync_nolock()
574 if (c->ro_error) in ubifs_wbuf_sync_nolock()
575 return -EROFS; in ubifs_wbuf_sync_nolock()
581 sync_len = ALIGN(wbuf->used, c->min_io_size); in ubifs_wbuf_sync_nolock()
582 dirt = sync_len - wbuf->used; in ubifs_wbuf_sync_nolock()
584 ubifs_pad(c, wbuf->buf + wbuf->used, dirt); in ubifs_wbuf_sync_nolock()
585 err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs, sync_len); in ubifs_wbuf_sync_nolock()
589 spin_lock(&wbuf->lock); in ubifs_wbuf_sync_nolock()
590 wbuf->offs += sync_len; in ubifs_wbuf_sync_nolock()
592 * Now @wbuf->offs is not necessarily aligned to @c->max_write_size. in ubifs_wbuf_sync_nolock()
594 * @c->max_write_size chunks and to @c->max_write_size-aligned offset. in ubifs_wbuf_sync_nolock()
595 * Thus, if @wbuf->offs is not aligned to @c->max_write_size now, make in ubifs_wbuf_sync_nolock()
596 * sure that @wbuf->offs + @wbuf->size is aligned to in ubifs_wbuf_sync_nolock()
597 * @c->max_write_size. This way we make sure that after next in ubifs_wbuf_sync_nolock()
598 * write-buffer flush we are again at the optimal offset (aligned to in ubifs_wbuf_sync_nolock()
599 * @c->max_write_size). in ubifs_wbuf_sync_nolock()
601 if (c->leb_size - wbuf->offs < c->max_write_size) in ubifs_wbuf_sync_nolock()
602 wbuf->size = c->leb_size - wbuf->offs; in ubifs_wbuf_sync_nolock()
603 else if (wbuf->offs & (c->max_write_size - 1)) in ubifs_wbuf_sync_nolock()
604 wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs; in ubifs_wbuf_sync_nolock()
606 wbuf->size = c->max_write_size; in ubifs_wbuf_sync_nolock()
607 wbuf->avail = wbuf->size; in ubifs_wbuf_sync_nolock()
608 wbuf->used = 0; in ubifs_wbuf_sync_nolock()
609 wbuf->next_ino = 0; in ubifs_wbuf_sync_nolock()
610 spin_unlock(&wbuf->lock); in ubifs_wbuf_sync_nolock()
612 if (wbuf->sync_callback) in ubifs_wbuf_sync_nolock()
613 err = wbuf->sync_callback(c, wbuf->lnum, in ubifs_wbuf_sync_nolock()
614 c->leb_size - wbuf->offs, dirt); in ubifs_wbuf_sync_nolock()
619 * ubifs_wbuf_seek_nolock - seek write-buffer.
620 * @wbuf: write-buffer
624 * This function targets the write-buffer to logical eraseblock @lnum:@offs.
625 * The write-buffer has to be empty. Returns zero in case of success and a
630 const struct ubifs_info *c = wbuf->c; in ubifs_wbuf_seek_nolock() local
632 dbg_io("LEB %d:%d, jhead %s", lnum, offs, dbg_jhead(wbuf->jhead)); in ubifs_wbuf_seek_nolock()
633 ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt); in ubifs_wbuf_seek_nolock()
634 ubifs_assert(c, offs >= 0 && offs <= c->leb_size); in ubifs_wbuf_seek_nolock()
635 ubifs_assert(c, offs % c->min_io_size == 0 && !(offs & 7)); in ubifs_wbuf_seek_nolock()
636 ubifs_assert(c, lnum != wbuf->lnum); in ubifs_wbuf_seek_nolock()
637 ubifs_assert(c, wbuf->used == 0); in ubifs_wbuf_seek_nolock()
639 spin_lock(&wbuf->lock); in ubifs_wbuf_seek_nolock()
640 wbuf->lnum = lnum; in ubifs_wbuf_seek_nolock()
641 wbuf->offs = offs; in ubifs_wbuf_seek_nolock()
642 if (c->leb_size - wbuf->offs < c->max_write_size) in ubifs_wbuf_seek_nolock()
643 wbuf->size = c->leb_size - wbuf->offs; in ubifs_wbuf_seek_nolock()
644 else if (wbuf->offs & (c->max_write_size - 1)) in ubifs_wbuf_seek_nolock()
645 wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs; in ubifs_wbuf_seek_nolock()
647 wbuf->size = c->max_write_size; in ubifs_wbuf_seek_nolock()
648 wbuf->avail = wbuf->size; in ubifs_wbuf_seek_nolock()
649 wbuf->used = 0; in ubifs_wbuf_seek_nolock()
650 spin_unlock(&wbuf->lock); in ubifs_wbuf_seek_nolock()
656 * ubifs_bg_wbufs_sync - synchronize write-buffers.
657 * @c: UBIFS file-system description object
659 * This function is called by background thread to synchronize write-buffers.
663 int ubifs_bg_wbufs_sync(struct ubifs_info *c) in ubifs_bg_wbufs_sync() argument
667 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_bg_wbufs_sync()
668 if (!c->need_wbuf_sync) in ubifs_bg_wbufs_sync()
670 c->need_wbuf_sync = 0; in ubifs_bg_wbufs_sync()
672 if (c->ro_error) { in ubifs_bg_wbufs_sync()
673 err = -EROFS; in ubifs_bg_wbufs_sync()
678 for (i = 0; i < c->jhead_cnt; i++) { in ubifs_bg_wbufs_sync()
679 struct ubifs_wbuf *wbuf = &c->jheads[i].wbuf; in ubifs_bg_wbufs_sync()
687 if (mutex_is_locked(&wbuf->io_mutex)) in ubifs_bg_wbufs_sync()
690 mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead); in ubifs_bg_wbufs_sync()
691 if (!wbuf->need_sync) { in ubifs_bg_wbufs_sync()
692 mutex_unlock(&wbuf->io_mutex); in ubifs_bg_wbufs_sync()
697 mutex_unlock(&wbuf->io_mutex); in ubifs_bg_wbufs_sync()
699 ubifs_err(c, "cannot sync write-buffer, error %d", err); in ubifs_bg_wbufs_sync()
700 ubifs_ro_mode(c, err); in ubifs_bg_wbufs_sync()
709 for (i = 0; i < c->jhead_cnt; i++) { in ubifs_bg_wbufs_sync()
710 struct ubifs_wbuf *wbuf = &c->jheads[i].wbuf; in ubifs_bg_wbufs_sync()
712 mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead); in ubifs_bg_wbufs_sync()
714 mutex_unlock(&wbuf->io_mutex); in ubifs_bg_wbufs_sync()
720 * ubifs_wbuf_write_nolock - write data to flash via write-buffer.
721 * @wbuf: write-buffer
725 * This function writes data to flash via write-buffer @wbuf. This means that
727 * does not take whole max. write unit (@c->max_write_size). Instead, the node
728 * will sit in RAM until the write-buffer is synchronized (e.g., by timer, or
729 * because more data are appended to the write-buffer).
733 * space in this logical eraseblock, %-ENOSPC is returned.
737 struct ubifs_info *c = wbuf->c; in ubifs_wbuf_write_nolock() local
741 dbg_ntype(((struct ubifs_ch *)buf)->node_type), in ubifs_wbuf_write_nolock()
742 dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs + wbuf->used); in ubifs_wbuf_write_nolock()
743 ubifs_assert(c, len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt); in ubifs_wbuf_write_nolock()
744 ubifs_assert(c, wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0); in ubifs_wbuf_write_nolock()
745 ubifs_assert(c, !(wbuf->offs & 7) && wbuf->offs <= c->leb_size); in ubifs_wbuf_write_nolock()
746 ubifs_assert(c, wbuf->avail > 0 && wbuf->avail <= wbuf->size); in ubifs_wbuf_write_nolock()
747 ubifs_assert(c, wbuf->size >= c->min_io_size); in ubifs_wbuf_write_nolock()
748 ubifs_assert(c, wbuf->size <= c->max_write_size); in ubifs_wbuf_write_nolock()
749 ubifs_assert(c, wbuf->size % c->min_io_size == 0); in ubifs_wbuf_write_nolock()
750 ubifs_assert(c, mutex_is_locked(&wbuf->io_mutex)); in ubifs_wbuf_write_nolock()
751 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_wbuf_write_nolock()
752 ubifs_assert(c, !c->space_fixup); in ubifs_wbuf_write_nolock()
753 if (c->leb_size - wbuf->offs >= c->max_write_size) in ubifs_wbuf_write_nolock()
754 ubifs_assert(c, !((wbuf->offs + wbuf->size) % c->max_write_size)); in ubifs_wbuf_write_nolock()
756 if (c->leb_size - wbuf->offs - wbuf->used < aligned_len) { in ubifs_wbuf_write_nolock()
757 err = -ENOSPC; in ubifs_wbuf_write_nolock()
763 if (c->ro_error) in ubifs_wbuf_write_nolock()
764 return -EROFS; in ubifs_wbuf_write_nolock()
766 if (aligned_len <= wbuf->avail) { in ubifs_wbuf_write_nolock()
769 * write-buffer. in ubifs_wbuf_write_nolock()
771 memcpy(wbuf->buf + wbuf->used, buf, len); in ubifs_wbuf_write_nolock()
773 ubifs_assert(c, aligned_len - len < 8); in ubifs_wbuf_write_nolock()
774 ubifs_pad(c, wbuf->buf + wbuf->used + len, aligned_len - len); in ubifs_wbuf_write_nolock()
777 if (aligned_len == wbuf->avail) { in ubifs_wbuf_write_nolock()
779 dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs); in ubifs_wbuf_write_nolock()
780 err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, in ubifs_wbuf_write_nolock()
781 wbuf->offs, wbuf->size); in ubifs_wbuf_write_nolock()
785 spin_lock(&wbuf->lock); in ubifs_wbuf_write_nolock()
786 wbuf->offs += wbuf->size; in ubifs_wbuf_write_nolock()
787 if (c->leb_size - wbuf->offs >= c->max_write_size) in ubifs_wbuf_write_nolock()
788 wbuf->size = c->max_write_size; in ubifs_wbuf_write_nolock()
790 wbuf->size = c->leb_size - wbuf->offs; in ubifs_wbuf_write_nolock()
791 wbuf->avail = wbuf->size; in ubifs_wbuf_write_nolock()
792 wbuf->used = 0; in ubifs_wbuf_write_nolock()
793 wbuf->next_ino = 0; in ubifs_wbuf_write_nolock()
794 spin_unlock(&wbuf->lock); in ubifs_wbuf_write_nolock()
796 spin_lock(&wbuf->lock); in ubifs_wbuf_write_nolock()
797 wbuf->avail -= aligned_len; in ubifs_wbuf_write_nolock()
798 wbuf->used += aligned_len; in ubifs_wbuf_write_nolock()
799 spin_unlock(&wbuf->lock); in ubifs_wbuf_write_nolock()
805 if (wbuf->used) { in ubifs_wbuf_write_nolock()
809 * write-buffer and switch to the next max. write unit. in ubifs_wbuf_write_nolock()
812 dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs); in ubifs_wbuf_write_nolock()
813 memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail); in ubifs_wbuf_write_nolock()
814 err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs, in ubifs_wbuf_write_nolock()
815 wbuf->size); in ubifs_wbuf_write_nolock()
819 wbuf->offs += wbuf->size; in ubifs_wbuf_write_nolock()
820 len -= wbuf->avail; in ubifs_wbuf_write_nolock()
821 aligned_len -= wbuf->avail; in ubifs_wbuf_write_nolock()
822 written += wbuf->avail; in ubifs_wbuf_write_nolock()
823 } else if (wbuf->offs & (c->max_write_size - 1)) { in ubifs_wbuf_write_nolock()
825 * The write-buffer offset is not aligned to in ubifs_wbuf_write_nolock()
826 * @c->max_write_size and @wbuf->size is less than in ubifs_wbuf_write_nolock()
827 * @c->max_write_size. Write @wbuf->size bytes to make sure the in ubifs_wbuf_write_nolock()
828 * following writes are done in optimal @c->max_write_size in ubifs_wbuf_write_nolock()
832 wbuf->size, wbuf->lnum, wbuf->offs); in ubifs_wbuf_write_nolock()
833 err = ubifs_leb_write(c, wbuf->lnum, buf, wbuf->offs, in ubifs_wbuf_write_nolock()
834 wbuf->size); in ubifs_wbuf_write_nolock()
838 wbuf->offs += wbuf->size; in ubifs_wbuf_write_nolock()
839 len -= wbuf->size; in ubifs_wbuf_write_nolock()
840 aligned_len -= wbuf->size; in ubifs_wbuf_write_nolock()
841 written += wbuf->size; in ubifs_wbuf_write_nolock()
847 * We align node length to 8-byte boundary because we anyway flash wbuf in ubifs_wbuf_write_nolock()
850 n = aligned_len >> c->max_write_shift; in ubifs_wbuf_write_nolock()
852 int m = n - 1; in ubifs_wbuf_write_nolock()
854 dbg_io("write %d bytes to LEB %d:%d", n, wbuf->lnum, in ubifs_wbuf_write_nolock()
855 wbuf->offs); in ubifs_wbuf_write_nolock()
858 /* '(n-1)<<c->max_write_shift < len' is always true. */ in ubifs_wbuf_write_nolock()
859 m <<= c->max_write_shift; in ubifs_wbuf_write_nolock()
860 err = ubifs_leb_write(c, wbuf->lnum, buf + written, in ubifs_wbuf_write_nolock()
861 wbuf->offs, m); in ubifs_wbuf_write_nolock()
864 wbuf->offs += m; in ubifs_wbuf_write_nolock()
865 aligned_len -= m; in ubifs_wbuf_write_nolock()
866 len -= m; in ubifs_wbuf_write_nolock()
871 * The non-written len of buf may be less than 'n' because in ubifs_wbuf_write_nolock()
875 n = 1 << c->max_write_shift; in ubifs_wbuf_write_nolock()
876 memcpy(wbuf->buf, buf + written, min(len, n)); in ubifs_wbuf_write_nolock()
878 ubifs_assert(c, n - len < 8); in ubifs_wbuf_write_nolock()
879 ubifs_pad(c, wbuf->buf + len, n - len); in ubifs_wbuf_write_nolock()
882 err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs, n); in ubifs_wbuf_write_nolock()
885 wbuf->offs += n; in ubifs_wbuf_write_nolock()
886 aligned_len -= n; in ubifs_wbuf_write_nolock()
887 len -= min(len, n); in ubifs_wbuf_write_nolock()
891 spin_lock(&wbuf->lock); in ubifs_wbuf_write_nolock()
895 * max. write unit, so write it to the write-buffer and we are in ubifs_wbuf_write_nolock()
898 memcpy(wbuf->buf, buf + written, len); in ubifs_wbuf_write_nolock()
900 ubifs_assert(c, aligned_len - len < 8); in ubifs_wbuf_write_nolock()
901 ubifs_pad(c, wbuf->buf + len, aligned_len - len); in ubifs_wbuf_write_nolock()
905 if (c->leb_size - wbuf->offs >= c->max_write_size) in ubifs_wbuf_write_nolock()
906 wbuf->size = c->max_write_size; in ubifs_wbuf_write_nolock()
908 wbuf->size = c->leb_size - wbuf->offs; in ubifs_wbuf_write_nolock()
909 wbuf->avail = wbuf->size - aligned_len; in ubifs_wbuf_write_nolock()
910 wbuf->used = aligned_len; in ubifs_wbuf_write_nolock()
911 wbuf->next_ino = 0; in ubifs_wbuf_write_nolock()
912 spin_unlock(&wbuf->lock); in ubifs_wbuf_write_nolock()
915 if (wbuf->sync_callback) { in ubifs_wbuf_write_nolock()
916 int free = c->leb_size - wbuf->offs - wbuf->used; in ubifs_wbuf_write_nolock()
918 err = wbuf->sync_callback(c, wbuf->lnum, free, 0); in ubifs_wbuf_write_nolock()
923 if (wbuf->used) in ubifs_wbuf_write_nolock()
924 new_wbuf_timer_nolock(c, wbuf); in ubifs_wbuf_write_nolock()
929 ubifs_err(c, "cannot write %d bytes to LEB %d:%d, error %d", in ubifs_wbuf_write_nolock()
930 len, wbuf->lnum, wbuf->offs, err); in ubifs_wbuf_write_nolock()
931 ubifs_dump_node(c, buf, written + len); in ubifs_wbuf_write_nolock()
933 ubifs_dump_leb(c, wbuf->lnum); in ubifs_wbuf_write_nolock()
938 * ubifs_write_node_hmac - write node to the media.
939 * @c: UBIFS file-system description object
952 int ubifs_write_node_hmac(struct ubifs_info *c, void *buf, int len, int lnum, in ubifs_write_node_hmac() argument
955 int err, buf_len = ALIGN(len, c->min_io_size); in ubifs_write_node_hmac()
958 lnum, offs, dbg_ntype(((struct ubifs_ch *)buf)->node_type), len, in ubifs_write_node_hmac()
960 ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt && offs >= 0); in ubifs_write_node_hmac()
961 ubifs_assert(c, offs % c->min_io_size == 0 && offs < c->leb_size); in ubifs_write_node_hmac()
962 ubifs_assert(c, !c->ro_media && !c->ro_mount); in ubifs_write_node_hmac()
963 ubifs_assert(c, !c->space_fixup); in ubifs_write_node_hmac()
965 if (c->ro_error) in ubifs_write_node_hmac()
966 return -EROFS; in ubifs_write_node_hmac()
968 err = ubifs_prepare_node_hmac(c, buf, len, hmac_offs, 1); in ubifs_write_node_hmac()
972 err = ubifs_leb_write(c, lnum, buf, offs, buf_len); in ubifs_write_node_hmac()
974 ubifs_dump_node(c, buf, len); in ubifs_write_node_hmac()
980 * ubifs_write_node - write node to the media.
981 * @c: UBIFS file-system description object
993 int ubifs_write_node(struct ubifs_info *c, void *buf, int len, int lnum, in ubifs_write_node() argument
996 return ubifs_write_node_hmac(c, buf, len, lnum, offs, -1); in ubifs_write_node()
1000 * ubifs_read_node_wbuf - read node from the media or write-buffer.
1001 * @wbuf: wbuf to check for un-written data
1009 * in @buf. If the node partially or fully sits in the write-buffer, this
1011 * Returns zero in case of success, %-EUCLEAN if CRC mismatched and a negative
1017 const struct ubifs_info *c = wbuf->c; in ubifs_read_node_wbuf() local
1022 dbg_ntype(type), len, dbg_jhead(wbuf->jhead)); in ubifs_read_node_wbuf()
1023 ubifs_assert(c, wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0); in ubifs_read_node_wbuf()
1024 ubifs_assert(c, !(offs & 7) && offs < c->leb_size); in ubifs_read_node_wbuf()
1025 ubifs_assert(c, type >= 0 && type < UBIFS_NODE_TYPES_CNT); in ubifs_read_node_wbuf()
1027 spin_lock(&wbuf->lock); in ubifs_read_node_wbuf()
1028 overlap = (lnum == wbuf->lnum && offs + len > wbuf->offs); in ubifs_read_node_wbuf()
1030 /* We may safely unlock the write-buffer and read the data */ in ubifs_read_node_wbuf()
1031 spin_unlock(&wbuf->lock); in ubifs_read_node_wbuf()
1032 return ubifs_read_node(c, buf, type, len, lnum, offs); in ubifs_read_node_wbuf()
1036 rlen = wbuf->offs - offs; in ubifs_read_node_wbuf()
1040 /* Copy the rest from the write-buffer */ in ubifs_read_node_wbuf()
1041 memcpy(buf + rlen, wbuf->buf + offs + rlen - wbuf->offs, len - rlen); in ubifs_read_node_wbuf()
1042 spin_unlock(&wbuf->lock); in ubifs_read_node_wbuf()
1045 /* Read everything that goes before write-buffer */ in ubifs_read_node_wbuf()
1046 err = ubifs_leb_read(c, lnum, buf, offs, rlen, 0); in ubifs_read_node_wbuf()
1047 if (err && err != -EBADMSG) in ubifs_read_node_wbuf()
1051 if (type != ch->node_type) { in ubifs_read_node_wbuf()
1052 ubifs_err(c, "bad node type (%d but expected %d)", in ubifs_read_node_wbuf()
1053 ch->node_type, type); in ubifs_read_node_wbuf()
1057 err = ubifs_check_node(c, buf, len, lnum, offs, 0, 0); in ubifs_read_node_wbuf()
1059 ubifs_err(c, "expected node type %d", type); in ubifs_read_node_wbuf()
1063 rlen = le32_to_cpu(ch->len); in ubifs_read_node_wbuf()
1065 ubifs_err(c, "bad node length %d, expected %d", rlen, len); in ubifs_read_node_wbuf()
1072 ubifs_err(c, "bad node at LEB %d:%d", lnum, offs); in ubifs_read_node_wbuf()
1073 ubifs_dump_node(c, buf, len); in ubifs_read_node_wbuf()
1075 return -EINVAL; in ubifs_read_node_wbuf()
1079 * ubifs_read_node - read node.
1080 * @c: UBIFS file-system description object
1088 * stores in @buf. Returns zero in case of success, %-EUCLEAN if CRC mismatched
1091 int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len, in ubifs_read_node() argument
1098 ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt && offs >= 0); in ubifs_read_node()
1099 ubifs_assert(c, len >= UBIFS_CH_SZ && offs + len <= c->leb_size); in ubifs_read_node()
1100 ubifs_assert(c, !(offs & 7) && offs < c->leb_size); in ubifs_read_node()
1101 ubifs_assert(c, type >= 0 && type < UBIFS_NODE_TYPES_CNT); in ubifs_read_node()
1103 err = ubifs_leb_read(c, lnum, buf, offs, len, 0); in ubifs_read_node()
1104 if (err && err != -EBADMSG) in ubifs_read_node()
1107 if (type != ch->node_type) { in ubifs_read_node()
1108 ubifs_errc(c, "bad node type (%d but expected %d)", in ubifs_read_node()
1109 ch->node_type, type); in ubifs_read_node()
1113 err = ubifs_check_node(c, buf, len, lnum, offs, 0, 0); in ubifs_read_node()
1115 ubifs_errc(c, "expected node type %d", type); in ubifs_read_node()
1119 l = le32_to_cpu(ch->len); in ubifs_read_node()
1121 ubifs_errc(c, "bad node length %d, expected %d", l, len); in ubifs_read_node()
1128 ubifs_errc(c, "bad node at LEB %d:%d, LEB mapping status %d", lnum, in ubifs_read_node()
1129 offs, ubi_is_mapped(c->ubi, lnum)); in ubifs_read_node()
1130 if (!c->probing) { in ubifs_read_node()
1131 ubifs_dump_node(c, buf, len); in ubifs_read_node()
1134 return -EINVAL; in ubifs_read_node()
1138 * ubifs_wbuf_init - initialize write-buffer.
1139 * @c: UBIFS file-system description object
1140 * @wbuf: write-buffer to initialize
1142 * This function initializes write-buffer. Returns zero in case of success
1143 * %-ENOMEM in case of failure.
1145 int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf) in ubifs_wbuf_init() argument
1149 wbuf->buf = kmalloc(c->max_write_size, GFP_KERNEL); in ubifs_wbuf_init()
1150 if (!wbuf->buf) in ubifs_wbuf_init()
1151 return -ENOMEM; in ubifs_wbuf_init()
1153 size = (c->max_write_size / UBIFS_CH_SZ + 1) * sizeof(ino_t); in ubifs_wbuf_init()
1154 wbuf->inodes = kmalloc(size, GFP_KERNEL); in ubifs_wbuf_init()
1155 if (!wbuf->inodes) { in ubifs_wbuf_init()
1156 kfree(wbuf->buf); in ubifs_wbuf_init()
1157 wbuf->buf = NULL; in ubifs_wbuf_init()
1158 return -ENOMEM; in ubifs_wbuf_init()
1161 wbuf->used = 0; in ubifs_wbuf_init()
1162 wbuf->lnum = wbuf->offs = -1; in ubifs_wbuf_init()
1165 * write-buffer size has to be set to @c->max_write_size. Otherwise, in ubifs_wbuf_init()
1169 size = c->max_write_size - (c->leb_start % c->max_write_size); in ubifs_wbuf_init()
1170 wbuf->avail = wbuf->size = size; in ubifs_wbuf_init()
1171 wbuf->sync_callback = NULL; in ubifs_wbuf_init()
1172 mutex_init(&wbuf->io_mutex); in ubifs_wbuf_init()
1173 spin_lock_init(&wbuf->lock); in ubifs_wbuf_init()
1174 wbuf->c = c; in ubifs_wbuf_init()
1175 wbuf->next_ino = 0; in ubifs_wbuf_init()
1177 hrtimer_setup(&wbuf->timer, wbuf_timer_callback_nolock, CLOCK_MONOTONIC, HRTIMER_MODE_REL); in ubifs_wbuf_init()
1182 * ubifs_wbuf_add_ino_nolock - add an inode number into the wbuf inode array.
1183 * @wbuf: the write-buffer where to add
1186 * This function adds an inode number to the inode array of the write-buffer.
1190 if (!wbuf->buf) in ubifs_wbuf_add_ino_nolock()
1194 spin_lock(&wbuf->lock); in ubifs_wbuf_add_ino_nolock()
1195 if (wbuf->used) in ubifs_wbuf_add_ino_nolock()
1196 wbuf->inodes[wbuf->next_ino++] = inum; in ubifs_wbuf_add_ino_nolock()
1197 spin_unlock(&wbuf->lock); in ubifs_wbuf_add_ino_nolock()
1201 * wbuf_has_ino - returns if the wbuf contains data from the inode.
1202 * @wbuf: the write-buffer
1205 * This function returns with %1 if the write-buffer contains some data from the
1212 spin_lock(&wbuf->lock); in wbuf_has_ino()
1213 for (i = 0; i < wbuf->next_ino; i++) in wbuf_has_ino()
1214 if (inum == wbuf->inodes[i]) { in wbuf_has_ino()
1218 spin_unlock(&wbuf->lock); in wbuf_has_ino()
1224 * ubifs_sync_wbufs_by_inode - synchronize write-buffers for an inode.
1225 * @c: UBIFS file-system description object
1228 * This function synchronizes write-buffers which contain nodes belonging to
1232 int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode) in ubifs_sync_wbufs_by_inode() argument
1236 for (i = 0; i < c->jhead_cnt; i++) { in ubifs_sync_wbufs_by_inode()
1237 struct ubifs_wbuf *wbuf = &c->jheads[i].wbuf; in ubifs_sync_wbufs_by_inode()
1243 * a _copy_ of corresponding on-flash node which sits in ubifs_sync_wbufs_by_inode()
1248 if (!wbuf_has_ino(wbuf, inode->i_ino)) in ubifs_sync_wbufs_by_inode()
1251 mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead); in ubifs_sync_wbufs_by_inode()
1252 if (wbuf_has_ino(wbuf, inode->i_ino)) in ubifs_sync_wbufs_by_inode()
1254 mutex_unlock(&wbuf->io_mutex); in ubifs_sync_wbufs_by_inode()
1257 ubifs_ro_mode(c, err); in ubifs_sync_wbufs_by_inode()