2 * Copyright (c) International Business Machines Corp., 2006
3 * Copyright (c) Nokia Corporation, 2007
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * Author: Artem Bityutskiy (Битюцкий Артём),
24 * This file includes UBI initialization and building of UBI devices. At the
25 * moment UBI devices may only be added while UBI is initialized, but dynamic
26 * device add/remove functionality is planned. Also, at the moment we only
27 * attach UBI devices by scanning, which will become a bottleneck when flashes
28 * reach certain large size. Then one may improve UBI and add other methods.
31 #include <linux/err.h>
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/stringify.h>
35 #include <linux/stat.h>
36 #include <linux/log2.h>
39 /* Maximum length of the 'mtd=' parameter */
40 #define MTD_PARAM_LEN_MAX 64
43 * struct mtd_dev_param - MTD device parameter description data structure.
44 * @name: MTD device name or number string
45 * @vid_hdr_offs: VID header offset
46 * @data_offs: data offset
50 char name[MTD_PARAM_LEN_MAX];
55 /* Numbers of elements set in the @mtd_dev_param array */
56 static int mtd_devs = 0;
58 /* MTD devices specification parameters */
59 static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES];
61 /* Number of UBI devices in system */
64 /* All UBI devices in system */
65 struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
67 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
68 struct class *ubi_class;
70 /* Slab cache for lock-tree entries */
71 struct kmem_cache *ubi_ltree_slab;
73 /* "Show" method for files in '/<sysfs>/class/ubi/' */
74 static ssize_t ubi_version_show(struct class *class, char *buf)
76 return sprintf(buf, "%d\n", UBI_VERSION);
79 /* UBI version attribute ('/<sysfs>/class/ubi/version') */
80 static struct class_attribute ubi_version =
81 __ATTR(version, S_IRUGO, ubi_version_show, NULL);
83 static ssize_t dev_attribute_show(struct device *dev,
84 struct device_attribute *attr, char *buf);
86 /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
87 static struct device_attribute dev_eraseblock_size =
88 __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL);
89 static struct device_attribute dev_avail_eraseblocks =
90 __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
91 static struct device_attribute dev_total_eraseblocks =
92 __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
93 static struct device_attribute dev_volumes_count =
94 __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL);
95 static struct device_attribute dev_max_ec =
96 __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
97 static struct device_attribute dev_reserved_for_bad =
98 __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
99 static struct device_attribute dev_bad_peb_count =
100 __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL);
101 static struct device_attribute dev_max_vol_count =
102 __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL);
103 static struct device_attribute dev_min_io_size =
104 __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL);
105 static struct device_attribute dev_bgt_enabled =
106 __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);
108 /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
109 static ssize_t dev_attribute_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
112 const struct ubi_device *ubi;
114 ubi = container_of(dev, struct ubi_device, dev);
115 if (attr == &dev_eraseblock_size)
116 return sprintf(buf, "%d\n", ubi->leb_size);
117 else if (attr == &dev_avail_eraseblocks)
118 return sprintf(buf, "%d\n", ubi->avail_pebs);
119 else if (attr == &dev_total_eraseblocks)
120 return sprintf(buf, "%d\n", ubi->good_peb_count);
121 else if (attr == &dev_volumes_count)
122 return sprintf(buf, "%d\n", ubi->vol_count);
123 else if (attr == &dev_max_ec)
124 return sprintf(buf, "%d\n", ubi->max_ec);
125 else if (attr == &dev_reserved_for_bad)
126 return sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
127 else if (attr == &dev_bad_peb_count)
128 return sprintf(buf, "%d\n", ubi->bad_peb_count);
129 else if (attr == &dev_max_vol_count)
130 return sprintf(buf, "%d\n", ubi->vtbl_slots);
131 else if (attr == &dev_min_io_size)
132 return sprintf(buf, "%d\n", ubi->min_io_size);
133 else if (attr == &dev_bgt_enabled)
134 return sprintf(buf, "%d\n", ubi->thread_enabled);
141 /* Fake "release" method for UBI devices */
142 static void dev_release(struct device *dev) { }
145 * ubi_sysfs_init - initialize sysfs for an UBI device.
146 * @ubi: UBI device description object
148 * This function returns zero in case of success and a negative error code in
151 static int ubi_sysfs_init(struct ubi_device *ubi)
155 ubi->dev.release = dev_release;
156 ubi->dev.devt = ubi->cdev.dev;
157 ubi->dev.class = ubi_class;
158 sprintf(&ubi->dev.bus_id[0], UBI_NAME_STR"%d", ubi->ubi_num);
159 err = device_register(&ubi->dev);
163 err = device_create_file(&ubi->dev, &dev_eraseblock_size);
166 err = device_create_file(&ubi->dev, &dev_avail_eraseblocks);
168 goto out_eraseblock_size;
169 err = device_create_file(&ubi->dev, &dev_total_eraseblocks);
171 goto out_avail_eraseblocks;
172 err = device_create_file(&ubi->dev, &dev_volumes_count);
174 goto out_total_eraseblocks;
175 err = device_create_file(&ubi->dev, &dev_max_ec);
177 goto out_volumes_count;
178 err = device_create_file(&ubi->dev, &dev_reserved_for_bad);
180 goto out_volumes_max_ec;
181 err = device_create_file(&ubi->dev, &dev_bad_peb_count);
183 goto out_reserved_for_bad;
184 err = device_create_file(&ubi->dev, &dev_max_vol_count);
186 goto out_bad_peb_count;
187 err = device_create_file(&ubi->dev, &dev_min_io_size);
189 goto out_max_vol_count;
190 err = device_create_file(&ubi->dev, &dev_bgt_enabled);
192 goto out_min_io_size;
197 device_remove_file(&ubi->dev, &dev_min_io_size);
199 device_remove_file(&ubi->dev, &dev_max_vol_count);
201 device_remove_file(&ubi->dev, &dev_bad_peb_count);
202 out_reserved_for_bad:
203 device_remove_file(&ubi->dev, &dev_reserved_for_bad);
205 device_remove_file(&ubi->dev, &dev_max_ec);
207 device_remove_file(&ubi->dev, &dev_volumes_count);
208 out_total_eraseblocks:
209 device_remove_file(&ubi->dev, &dev_total_eraseblocks);
210 out_avail_eraseblocks:
211 device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
213 device_remove_file(&ubi->dev, &dev_eraseblock_size);
215 device_unregister(&ubi->dev);
217 ubi_err("failed to initialize sysfs for %s, error %d",
223 * ubi_sysfs_close - close sysfs for an UBI device.
224 * @ubi: UBI device description object
226 static void ubi_sysfs_close(struct ubi_device *ubi)
228 device_remove_file(&ubi->dev, &dev_bgt_enabled);
229 device_remove_file(&ubi->dev, &dev_min_io_size);
230 device_remove_file(&ubi->dev, &dev_max_vol_count);
231 device_remove_file(&ubi->dev, &dev_bad_peb_count);
232 device_remove_file(&ubi->dev, &dev_reserved_for_bad);
233 device_remove_file(&ubi->dev, &dev_max_ec);
234 device_remove_file(&ubi->dev, &dev_volumes_count);
235 device_remove_file(&ubi->dev, &dev_total_eraseblocks);
236 device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
237 device_remove_file(&ubi->dev, &dev_eraseblock_size);
238 device_unregister(&ubi->dev);
242 * kill_volumes - destroy all volumes.
243 * @ubi: UBI device description object
245 static void kill_volumes(struct ubi_device *ubi)
249 for (i = 0; i < ubi->vtbl_slots; i++)
251 ubi_free_volume(ubi, i);
255 * uif_init - initialize user interfaces for an UBI device.
256 * @ubi: UBI device description object
258 * This function returns zero in case of success and a negative error code in
261 static int uif_init(struct ubi_device *ubi)
266 mutex_init(&ubi->vtbl_mutex);
267 spin_lock_init(&ubi->volumes_lock);
269 sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
272 * Major numbers for the UBI character devices are allocated
273 * dynamically. Major numbers of volume character devices are
274 * equivalent to ones of the corresponding UBI character device. Minor
275 * numbers of UBI character devices are 0, while minor numbers of
276 * volume character devices start from 1. Thus, we allocate one major
277 * number and ubi->vtbl_slots + 1 minor numbers.
279 err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name);
281 ubi_err("cannot register UBI character devices");
285 ubi_assert(MINOR(dev) == 0);
286 cdev_init(&ubi->cdev, &ubi_cdev_operations);
287 dbg_msg("%s major is %u", ubi->ubi_name, MAJOR(dev));
288 ubi->cdev.owner = THIS_MODULE;
290 err = cdev_add(&ubi->cdev, dev, 1);
292 ubi_err("cannot add character device");
296 err = ubi_sysfs_init(ubi);
300 for (i = 0; i < ubi->vtbl_slots; i++)
301 if (ubi->volumes[i]) {
302 err = ubi_add_volume(ubi, i);
304 ubi_err("cannot add volume %d", i);
313 ubi_sysfs_close(ubi);
315 cdev_del(&ubi->cdev);
317 unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
318 ubi_err("cannot initialize UBI %s, error %d", ubi->ubi_name, err);
323 * uif_close - close user interfaces for an UBI device.
324 * @ubi: UBI device description object
326 static void uif_close(struct ubi_device *ubi)
329 ubi_sysfs_close(ubi);
330 cdev_del(&ubi->cdev);
331 unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
335 * attach_by_scanning - attach an MTD device using scanning method.
336 * @ubi: UBI device descriptor
338 * This function returns zero in case of success and a negative error code in
341 * Note, currently this is the only method to attach UBI devices. Hopefully in
342 * the future we'll have more scalable attaching methods and avoid full media
343 * scanning. But even in this case scanning will be needed as a fall-back
344 * attaching method if there are some on-flash table corruptions.
346 static int attach_by_scanning(struct ubi_device *ubi)
349 struct ubi_scan_info *si;
355 ubi->bad_peb_count = si->bad_peb_count;
356 ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
357 ubi->max_ec = si->max_ec;
358 ubi->mean_ec = si->mean_ec;
360 err = ubi_read_volume_table(ubi, si);
364 err = ubi_wl_init_scan(ubi, si);
368 err = ubi_eba_init_scan(ubi, si);
372 ubi_scan_destroy_si(si);
380 ubi_scan_destroy_si(si);
385 * io_init - initialize I/O unit for a given UBI device.
386 * @ubi: UBI device description object
388 * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
390 * o EC header is always at offset zero - this cannot be changed;
391 * o VID header starts just after the EC header at the closest address
392 * aligned to @io->@hdrs_min_io_size;
393 * o data starts just after the VID header at the closest address aligned to
396 * This function returns zero in case of success and a negative error code in
399 static int io_init(struct ubi_device *ubi)
401 if (ubi->mtd->numeraseregions != 0) {
403 * Some flashes have several erase regions. Different regions
404 * may have different eraseblock size and other
405 * characteristics. It looks like mostly multi-region flashes
406 * have one "main" region and one or more small regions to
407 * store boot loader code or boot parameters or whatever. I
408 * guess we should just pick the largest region. But this is
411 ubi_err("multiple regions, not implemented");
416 * Note, in this implementation we support MTD devices with 0x7FFFFFFF
417 * physical eraseblocks maximum.
420 ubi->peb_size = ubi->mtd->erasesize;
421 ubi->peb_count = ubi->mtd->size / ubi->mtd->erasesize;
422 ubi->flash_size = ubi->mtd->size;
424 if (ubi->mtd->block_isbad && ubi->mtd->block_markbad)
425 ubi->bad_allowed = 1;
427 ubi->min_io_size = ubi->mtd->writesize;
428 ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
430 /* Make sure minimal I/O unit is power of 2 */
431 if (!is_power_of_2(ubi->min_io_size)) {
432 ubi_err("min. I/O unit (%d) is not power of 2",
437 ubi_assert(ubi->hdrs_min_io_size > 0);
438 ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
439 ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
441 /* Calculate default aligned sizes of EC and VID headers */
442 ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
443 ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
445 dbg_msg("min_io_size %d", ubi->min_io_size);
446 dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
447 dbg_msg("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
448 dbg_msg("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
450 if (ubi->vid_hdr_offset == 0)
452 ubi->vid_hdr_offset = ubi->vid_hdr_aloffset =
455 ubi->vid_hdr_aloffset = ubi->vid_hdr_offset &
456 ~(ubi->hdrs_min_io_size - 1);
457 ubi->vid_hdr_shift = ubi->vid_hdr_offset -
458 ubi->vid_hdr_aloffset;
461 /* Similar for the data offset */
462 if (ubi->leb_start == 0) {
463 ubi->leb_start = ubi->vid_hdr_offset + ubi->vid_hdr_alsize;
464 ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size);
467 dbg_msg("vid_hdr_offset %d", ubi->vid_hdr_offset);
468 dbg_msg("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
469 dbg_msg("vid_hdr_shift %d", ubi->vid_hdr_shift);
470 dbg_msg("leb_start %d", ubi->leb_start);
472 /* The shift must be aligned to 32-bit boundary */
473 if (ubi->vid_hdr_shift % 4) {
474 ubi_err("unaligned VID header shift %d",
480 if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE ||
481 ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE ||
482 ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE ||
483 ubi->leb_start % ubi->min_io_size) {
484 ubi_err("bad VID header (%d) or data offsets (%d)",
485 ubi->vid_hdr_offset, ubi->leb_start);
490 * It may happen that EC and VID headers are situated in one minimal
491 * I/O unit. In this case we can only accept this UBI image in
494 if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) {
495 ubi_warn("EC and VID headers are in the same minimal I/O unit, "
496 "switch to read-only mode");
500 ubi->leb_size = ubi->peb_size - ubi->leb_start;
502 if (!(ubi->mtd->flags & MTD_WRITEABLE)) {
503 ubi_msg("MTD device %d is write-protected, attach in "
504 "read-only mode", ubi->mtd->index);
508 dbg_msg("leb_size %d", ubi->leb_size);
509 dbg_msg("ro_mode %d", ubi->ro_mode);
512 * Note, ideally, we have to initialize ubi->bad_peb_count here. But
513 * unfortunately, MTD does not provide this information. We should loop
514 * over all physical eraseblocks and invoke mtd->block_is_bad() for
515 * each physical eraseblock. So, we skip ubi->bad_peb_count
516 * uninitialized and initialize it after scanning.
523 * attach_mtd_dev - attach an MTD device.
524 * @mtd_dev: MTD device name or number string
525 * @vid_hdr_offset: VID header offset
526 * @data_offset: data offset
528 * This function attaches an MTD device to UBI. It first treats @mtd_dev as the
529 * MTD device name, and tries to open it by this name. If it is unable to open,
530 * it tries to convert @mtd_dev to an integer and open the MTD device by its
531 * number. Returns zero in case of success and a negative error code in case of
534 static int attach_mtd_dev(const char *mtd_dev, int vid_hdr_offset,
537 struct ubi_device *ubi;
538 struct mtd_info *mtd;
541 mtd = get_mtd_device_nm(mtd_dev);
546 if (PTR_ERR(mtd) != -ENODEV)
550 * Probably this is not MTD device name but MTD device number -
553 mtd_num = simple_strtoul(mtd_dev, &endp, 0);
554 if (*endp != '\0' || mtd_dev == endp) {
555 ubi_err("incorrect MTD device: \"%s\"", mtd_dev);
559 mtd = get_mtd_device(NULL, mtd_num);
564 /* Check if we already have the same MTD device attached */
565 for (i = 0; i < ubi_devices_cnt; i++)
566 if (ubi_devices[i]->mtd->index == mtd->index) {
567 ubi_err("mtd%d is already attached to ubi%d",
573 ubi = ubi_devices[ubi_devices_cnt] = kzalloc(sizeof(struct ubi_device),
580 ubi->ubi_num = ubi_devices_cnt;
583 dbg_msg("attaching mtd%d to ubi%d: VID header offset %d data offset %d",
584 ubi->mtd->index, ubi_devices_cnt, vid_hdr_offset, data_offset);
586 ubi->vid_hdr_offset = vid_hdr_offset;
587 ubi->leb_start = data_offset;
592 mutex_init(&ubi->buf_mutex);
593 ubi->peb_buf1 = vmalloc(ubi->peb_size);
597 ubi->peb_buf2 = vmalloc(ubi->peb_size);
601 #ifdef CONFIG_MTD_UBI_DEBUG
602 mutex_init(&ubi->dbg_buf_mutex);
603 ubi->dbg_peb_buf = vmalloc(ubi->peb_size);
604 if (!ubi->dbg_peb_buf)
608 err = attach_by_scanning(ubi);
610 dbg_err("failed to attach by scanning, error %d", err);
618 ubi_msg("attached mtd%d to ubi%d", ubi->mtd->index, ubi_devices_cnt);
619 ubi_msg("MTD device name: \"%s\"", ubi->mtd->name);
620 ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
621 ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
622 ubi->peb_size, ubi->peb_size >> 10);
623 ubi_msg("logical eraseblock size: %d bytes", ubi->leb_size);
624 ubi_msg("number of good PEBs: %d", ubi->good_peb_count);
625 ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count);
626 ubi_msg("smallest flash I/O unit: %d", ubi->min_io_size);
627 ubi_msg("VID header offset: %d (aligned %d)",
628 ubi->vid_hdr_offset, ubi->vid_hdr_aloffset);
629 ubi_msg("data offset: %d", ubi->leb_start);
630 ubi_msg("max. allowed volumes: %d", ubi->vtbl_slots);
631 ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD);
632 ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
633 ubi_msg("number of user volumes: %d",
634 ubi->vol_count - UBI_INT_VOL_COUNT);
635 ubi_msg("available PEBs: %d", ubi->avail_pebs);
636 ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs);
637 ubi_msg("number of PEBs reserved for bad PEB handling: %d",
639 ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
641 /* Enable the background thread */
642 if (!DBG_DISABLE_BGT) {
643 ubi->thread_enabled = 1;
644 wake_up_process(ubi->bgt_thread);
647 ubi_devices_cnt += 1;
655 vfree(ubi->peb_buf1);
656 vfree(ubi->peb_buf2);
657 #ifdef CONFIG_MTD_UBI_DEBUG
658 vfree(ubi->dbg_peb_buf);
663 ubi_devices[ubi_devices_cnt] = NULL;
668 * detach_mtd_dev - detach an MTD device.
669 * @ubi: UBI device description object
671 static void detach_mtd_dev(struct ubi_device *ubi)
673 int ubi_num = ubi->ubi_num, mtd_num = ubi->mtd->index;
675 dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
680 put_mtd_device(ubi->mtd);
681 vfree(ubi->peb_buf1);
682 vfree(ubi->peb_buf2);
683 #ifdef CONFIG_MTD_UBI_DEBUG
684 vfree(ubi->dbg_peb_buf);
686 kfree(ubi_devices[ubi_num]);
687 ubi_devices[ubi_num] = NULL;
688 ubi_devices_cnt -= 1;
689 ubi_assert(ubi_devices_cnt >= 0);
690 ubi_msg("mtd%d is detached from ubi%d", mtd_num, ubi_num);
694 * ltree_entry_ctor - lock tree entries slab cache constructor.
695 * @obj: the lock-tree entry to construct
696 * @cache: the lock tree entry slab cache
697 * @flags: constructor flags
699 static void ltree_entry_ctor(struct kmem_cache *cache, void *obj)
701 struct ubi_ltree_entry *le = obj;
704 init_rwsem(&le->mutex);
707 static int __init ubi_init(void)
711 /* Ensure that EC and VID headers have correct size */
712 BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
713 BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
715 if (mtd_devs > UBI_MAX_DEVICES) {
716 printk("UBI error: too many MTD devices, maximum is %d\n",
721 ubi_class = class_create(THIS_MODULE, UBI_NAME_STR);
722 if (IS_ERR(ubi_class))
723 return PTR_ERR(ubi_class);
725 err = class_create_file(ubi_class, &ubi_version);
729 ubi_ltree_slab = kmem_cache_create("ubi_ltree_slab",
730 sizeof(struct ubi_ltree_entry), 0,
731 0, <ree_entry_ctor);
735 /* Attach MTD devices */
736 for (i = 0; i < mtd_devs; i++) {
737 struct mtd_dev_param *p = &mtd_dev_param[i];
740 err = attach_mtd_dev(p->name, p->vid_hdr_offs, p->data_offs);
748 for (k = 0; k < i; k++)
749 detach_mtd_dev(ubi_devices[k]);
750 kmem_cache_destroy(ubi_ltree_slab);
752 class_remove_file(ubi_class, &ubi_version);
754 class_destroy(ubi_class);
757 module_init(ubi_init);
759 static void __exit ubi_exit(void)
761 int i, n = ubi_devices_cnt;
763 for (i = 0; i < n; i++)
764 detach_mtd_dev(ubi_devices[i]);
765 kmem_cache_destroy(ubi_ltree_slab);
766 class_remove_file(ubi_class, &ubi_version);
767 class_destroy(ubi_class);
769 module_exit(ubi_exit);
772 * bytes_str_to_int - convert a string representing number of bytes to an
774 * @str: the string to convert
776 * This function returns positive resulting integer in case of success and a
777 * negative error code in case of failure.
779 static int __init bytes_str_to_int(const char *str)
782 unsigned long result;
784 result = simple_strtoul(str, &endp, 0);
785 if (str == endp || result < 0) {
786 printk("UBI error: incorrect bytes count: \"%s\"\n", str);
798 if (endp[1] == 'i' && (endp[2] == '\0' ||
799 endp[2] == 'B' || endp[2] == 'b'))
804 printk("UBI error: incorrect bytes count: \"%s\"\n", str);
812 * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter.
813 * @val: the parameter value to parse
816 * This function returns zero in case of success and a negative error code in
819 static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
822 struct mtd_dev_param *p;
823 char buf[MTD_PARAM_LEN_MAX];
824 char *pbuf = &buf[0];
825 char *tokens[3] = {NULL, NULL, NULL};
827 if (mtd_devs == UBI_MAX_DEVICES) {
828 printk("UBI error: too many parameters, max. is %d\n",
833 len = strnlen(val, MTD_PARAM_LEN_MAX);
834 if (len == MTD_PARAM_LEN_MAX) {
835 printk("UBI error: parameter \"%s\" is too long, max. is %d\n",
836 val, MTD_PARAM_LEN_MAX);
841 printk("UBI warning: empty 'mtd=' parameter - ignored\n");
847 /* Get rid of the final newline */
848 if (buf[len - 1] == '\n')
851 for (i = 0; i < 3; i++)
852 tokens[i] = strsep(&pbuf, ",");
855 printk("UBI error: too many arguments at \"%s\"\n", val);
859 p = &mtd_dev_param[mtd_devs];
860 strcpy(&p->name[0], tokens[0]);
863 p->vid_hdr_offs = bytes_str_to_int(tokens[1]);
865 p->data_offs = bytes_str_to_int(tokens[2]);
867 if (p->vid_hdr_offs < 0)
868 return p->vid_hdr_offs;
869 if (p->data_offs < 0)
876 module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
877 MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: "
878 "mtd=<name|num>[,<vid_hdr_offs>,<data_offs>]. "
879 "Multiple \"mtd\" parameters may be specified.\n"
880 "MTD devices may be specified by their number or name. "
881 "Optional \"vid_hdr_offs\" and \"data_offs\" parameters "
882 "specify UBI VID header position and data starting "
883 "position to be used by UBI.\n"
884 "Example: mtd=content,1984,2048 mtd=4 - attach MTD device"
885 "with name content using VID header offset 1984 and data "
886 "start 2048, and MTD device number 4 using default "
889 MODULE_VERSION(__stringify(UBI_VERSION));
890 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
891 MODULE_AUTHOR("Artem Bityutskiy");
892 MODULE_LICENSE("GPL");