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.
26 * When UBI is initialized, it attaches all the MTD devices specified as the
27 * module load parameters or the kernel boot parameters. If MTD devices were
28 * specified, UBI does not attach any MTD device, but it is possible to do
29 * later using the "UBI control device".
32 #include <linux/err.h>
33 #include <linux/module.h>
34 #include <linux/moduleparam.h>
35 #include <linux/stringify.h>
36 #include <linux/namei.h>
37 #include <linux/stat.h>
38 #include <linux/miscdevice.h>
39 #include <linux/mtd/partitions.h>
40 #include <linux/log2.h>
41 #include <linux/kthread.h>
42 #include <linux/kernel.h>
43 #include <linux/slab.h>
44 #include <linux/major.h>
47 /* Maximum length of the 'mtd=' parameter */
48 #define MTD_PARAM_LEN_MAX 64
50 /* Maximum number of comma-separated items in the 'mtd=' parameter */
51 #define MTD_PARAM_MAX_COUNT 4
53 /* Maximum value for the number of bad PEBs per 1024 PEBs */
54 #define MAX_MTD_UBI_BEB_LIMIT 768
56 #ifdef CONFIG_MTD_UBI_MODULE
57 #define ubi_is_module() 1
59 #define ubi_is_module() 0
63 * struct mtd_dev_param - MTD device parameter description data structure.
64 * @name: MTD character device node path, MTD device name, or MTD device number
66 * @vid_hdr_offs: VID header offset
67 * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs
69 struct mtd_dev_param {
70 char name[MTD_PARAM_LEN_MAX];
76 /* Numbers of elements set in the @mtd_dev_param array */
77 static int __initdata mtd_devs;
79 /* MTD devices specification parameters */
80 static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES];
81 #ifdef CONFIG_MTD_UBI_FASTMAP
82 /* UBI module parameter to enable fastmap automatically on non-fastmap images */
83 static bool fm_autoconvert;
85 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
86 struct class *ubi_class;
88 /* Slab cache for wear-leveling entries */
89 struct kmem_cache *ubi_wl_entry_slab;
91 /* UBI control character device */
92 static struct miscdevice ubi_ctrl_cdev = {
93 .minor = MISC_DYNAMIC_MINOR,
95 .fops = &ubi_ctrl_cdev_operations,
98 /* All UBI devices in system */
99 static struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
101 /* Serializes UBI devices creations and removals */
102 DEFINE_MUTEX(ubi_devices_mutex);
104 /* Protects @ubi_devices and @ubi->ref_count */
105 static DEFINE_SPINLOCK(ubi_devices_lock);
107 /* "Show" method for files in '/<sysfs>/class/ubi/' */
108 static ssize_t ubi_version_show(struct class *class,
109 struct class_attribute *attr, char *buf)
111 return sprintf(buf, "%d\n", UBI_VERSION);
114 /* UBI version attribute ('/<sysfs>/class/ubi/version') */
115 static struct class_attribute ubi_version =
116 __ATTR(version, S_IRUGO, ubi_version_show, NULL);
118 static ssize_t dev_attribute_show(struct device *dev,
119 struct device_attribute *attr, char *buf);
121 /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
122 static struct device_attribute dev_eraseblock_size =
123 __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL);
124 static struct device_attribute dev_avail_eraseblocks =
125 __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
126 static struct device_attribute dev_total_eraseblocks =
127 __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
128 static struct device_attribute dev_volumes_count =
129 __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL);
130 static struct device_attribute dev_max_ec =
131 __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
132 static struct device_attribute dev_reserved_for_bad =
133 __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
134 static struct device_attribute dev_bad_peb_count =
135 __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL);
136 static struct device_attribute dev_max_vol_count =
137 __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL);
138 static struct device_attribute dev_min_io_size =
139 __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL);
140 static struct device_attribute dev_bgt_enabled =
141 __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);
142 static struct device_attribute dev_mtd_num =
143 __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL);
146 * ubi_volume_notify - send a volume change notification.
147 * @ubi: UBI device description object
148 * @vol: volume description object of the changed volume
149 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
151 * This is a helper function which notifies all subscribers about a volume
152 * change event (creation, removal, re-sizing, re-naming, updating). Returns
153 * zero in case of success and a negative error code in case of failure.
155 int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
158 struct ubi_notification nt;
160 ubi_do_get_device_info(ubi, &nt.di);
161 ubi_do_get_volume_info(ubi, vol, &nt.vi);
164 case UBI_VOLUME_ADDED:
165 case UBI_VOLUME_REMOVED:
166 case UBI_VOLUME_RESIZED:
167 case UBI_VOLUME_RENAMED:
168 ret = ubi_update_fastmap(ubi);
170 ubi_msg(ubi, "Unable to write a new fastmap: %i", ret);
173 return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
177 * ubi_notify_all - send a notification to all volumes.
178 * @ubi: UBI device description object
179 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
180 * @nb: the notifier to call
182 * This function walks all volumes of UBI device @ubi and sends the @ntype
183 * notification for each volume. If @nb is %NULL, then all registered notifiers
184 * are called, otherwise only the @nb notifier is called. Returns the number of
185 * sent notifications.
187 int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb)
189 struct ubi_notification nt;
192 ubi_do_get_device_info(ubi, &nt.di);
194 mutex_lock(&ubi->device_mutex);
195 for (i = 0; i < ubi->vtbl_slots; i++) {
197 * Since the @ubi->device is locked, and we are not going to
198 * change @ubi->volumes, we do not have to lock
199 * @ubi->volumes_lock.
201 if (!ubi->volumes[i])
204 ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi);
206 nb->notifier_call(nb, ntype, &nt);
208 blocking_notifier_call_chain(&ubi_notifiers, ntype,
212 mutex_unlock(&ubi->device_mutex);
218 * ubi_enumerate_volumes - send "add" notification for all existing volumes.
219 * @nb: the notifier to call
221 * This function walks all UBI devices and volumes and sends the
222 * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all
223 * registered notifiers are called, otherwise only the @nb notifier is called.
224 * Returns the number of sent notifications.
226 int ubi_enumerate_volumes(struct notifier_block *nb)
231 * Since the @ubi_devices_mutex is locked, and we are not going to
232 * change @ubi_devices, we do not have to lock @ubi_devices_lock.
234 for (i = 0; i < UBI_MAX_DEVICES; i++) {
235 struct ubi_device *ubi = ubi_devices[i];
239 count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb);
246 * ubi_get_device - get UBI device.
247 * @ubi_num: UBI device number
249 * This function returns UBI device description object for UBI device number
250 * @ubi_num, or %NULL if the device does not exist. This function increases the
251 * device reference count to prevent removal of the device. In other words, the
252 * device cannot be removed if its reference count is not zero.
254 struct ubi_device *ubi_get_device(int ubi_num)
256 struct ubi_device *ubi;
258 spin_lock(&ubi_devices_lock);
259 ubi = ubi_devices[ubi_num];
261 ubi_assert(ubi->ref_count >= 0);
263 get_device(&ubi->dev);
265 spin_unlock(&ubi_devices_lock);
271 * ubi_put_device - drop an UBI device reference.
272 * @ubi: UBI device description object
274 void ubi_put_device(struct ubi_device *ubi)
276 spin_lock(&ubi_devices_lock);
278 put_device(&ubi->dev);
279 spin_unlock(&ubi_devices_lock);
283 * ubi_get_by_major - get UBI device by character device major number.
284 * @major: major number
286 * This function is similar to 'ubi_get_device()', but it searches the device
287 * by its major number.
289 struct ubi_device *ubi_get_by_major(int major)
292 struct ubi_device *ubi;
294 spin_lock(&ubi_devices_lock);
295 for (i = 0; i < UBI_MAX_DEVICES; i++) {
296 ubi = ubi_devices[i];
297 if (ubi && MAJOR(ubi->cdev.dev) == major) {
298 ubi_assert(ubi->ref_count >= 0);
300 get_device(&ubi->dev);
301 spin_unlock(&ubi_devices_lock);
305 spin_unlock(&ubi_devices_lock);
311 * ubi_major2num - get UBI device number by character device major number.
312 * @major: major number
314 * This function searches UBI device number object by its major number. If UBI
315 * device was not found, this function returns -ENODEV, otherwise the UBI device
316 * number is returned.
318 int ubi_major2num(int major)
320 int i, ubi_num = -ENODEV;
322 spin_lock(&ubi_devices_lock);
323 for (i = 0; i < UBI_MAX_DEVICES; i++) {
324 struct ubi_device *ubi = ubi_devices[i];
326 if (ubi && MAJOR(ubi->cdev.dev) == major) {
327 ubi_num = ubi->ubi_num;
331 spin_unlock(&ubi_devices_lock);
336 /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
337 static ssize_t dev_attribute_show(struct device *dev,
338 struct device_attribute *attr, char *buf)
341 struct ubi_device *ubi;
344 * The below code looks weird, but it actually makes sense. We get the
345 * UBI device reference from the contained 'struct ubi_device'. But it
346 * is unclear if the device was removed or not yet. Indeed, if the
347 * device was removed before we increased its reference count,
348 * 'ubi_get_device()' will return -ENODEV and we fail.
350 * Remember, 'struct ubi_device' is freed in the release function, so
351 * we still can use 'ubi->ubi_num'.
353 ubi = container_of(dev, struct ubi_device, dev);
354 ubi = ubi_get_device(ubi->ubi_num);
358 if (attr == &dev_eraseblock_size)
359 ret = sprintf(buf, "%d\n", ubi->leb_size);
360 else if (attr == &dev_avail_eraseblocks)
361 ret = sprintf(buf, "%d\n", ubi->avail_pebs);
362 else if (attr == &dev_total_eraseblocks)
363 ret = sprintf(buf, "%d\n", ubi->good_peb_count);
364 else if (attr == &dev_volumes_count)
365 ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT);
366 else if (attr == &dev_max_ec)
367 ret = sprintf(buf, "%d\n", ubi->max_ec);
368 else if (attr == &dev_reserved_for_bad)
369 ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
370 else if (attr == &dev_bad_peb_count)
371 ret = sprintf(buf, "%d\n", ubi->bad_peb_count);
372 else if (attr == &dev_max_vol_count)
373 ret = sprintf(buf, "%d\n", ubi->vtbl_slots);
374 else if (attr == &dev_min_io_size)
375 ret = sprintf(buf, "%d\n", ubi->min_io_size);
376 else if (attr == &dev_bgt_enabled)
377 ret = sprintf(buf, "%d\n", ubi->thread_enabled);
378 else if (attr == &dev_mtd_num)
379 ret = sprintf(buf, "%d\n", ubi->mtd->index);
387 static void dev_release(struct device *dev)
389 struct ubi_device *ubi = container_of(dev, struct ubi_device, dev);
395 * ubi_sysfs_init - initialize sysfs for an UBI device.
396 * @ubi: UBI device description object
397 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
400 * This function returns zero in case of success and a negative error code in
403 static int ubi_sysfs_init(struct ubi_device *ubi, int *ref)
407 ubi->dev.release = dev_release;
408 ubi->dev.devt = ubi->cdev.dev;
409 ubi->dev.class = ubi_class;
410 dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num);
411 err = device_register(&ubi->dev);
416 err = device_create_file(&ubi->dev, &dev_eraseblock_size);
419 err = device_create_file(&ubi->dev, &dev_avail_eraseblocks);
422 err = device_create_file(&ubi->dev, &dev_total_eraseblocks);
425 err = device_create_file(&ubi->dev, &dev_volumes_count);
428 err = device_create_file(&ubi->dev, &dev_max_ec);
431 err = device_create_file(&ubi->dev, &dev_reserved_for_bad);
434 err = device_create_file(&ubi->dev, &dev_bad_peb_count);
437 err = device_create_file(&ubi->dev, &dev_max_vol_count);
440 err = device_create_file(&ubi->dev, &dev_min_io_size);
443 err = device_create_file(&ubi->dev, &dev_bgt_enabled);
446 err = device_create_file(&ubi->dev, &dev_mtd_num);
451 * ubi_sysfs_close - close sysfs for an UBI device.
452 * @ubi: UBI device description object
454 static void ubi_sysfs_close(struct ubi_device *ubi)
456 device_remove_file(&ubi->dev, &dev_mtd_num);
457 device_remove_file(&ubi->dev, &dev_bgt_enabled);
458 device_remove_file(&ubi->dev, &dev_min_io_size);
459 device_remove_file(&ubi->dev, &dev_max_vol_count);
460 device_remove_file(&ubi->dev, &dev_bad_peb_count);
461 device_remove_file(&ubi->dev, &dev_reserved_for_bad);
462 device_remove_file(&ubi->dev, &dev_max_ec);
463 device_remove_file(&ubi->dev, &dev_volumes_count);
464 device_remove_file(&ubi->dev, &dev_total_eraseblocks);
465 device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
466 device_remove_file(&ubi->dev, &dev_eraseblock_size);
467 device_unregister(&ubi->dev);
471 * kill_volumes - destroy all user volumes.
472 * @ubi: UBI device description object
474 static void kill_volumes(struct ubi_device *ubi)
478 for (i = 0; i < ubi->vtbl_slots; i++)
480 ubi_free_volume(ubi, ubi->volumes[i]);
484 * uif_init - initialize user interfaces for an UBI device.
485 * @ubi: UBI device description object
486 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
487 * taken, otherwise set to %0
489 * This function initializes various user interfaces for an UBI device. If the
490 * initialization fails at an early stage, this function frees all the
491 * resources it allocated, returns an error, and @ref is set to %0. However,
492 * if the initialization fails after the UBI device was registered in the
493 * driver core subsystem, this function takes a reference to @ubi->dev, because
494 * otherwise the release function ('dev_release()') would free whole @ubi
495 * object. The @ref argument is set to %1 in this case. The caller has to put
498 * This function returns zero in case of success and a negative error code in
501 static int uif_init(struct ubi_device *ubi, int *ref)
507 sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
510 * Major numbers for the UBI character devices are allocated
511 * dynamically. Major numbers of volume character devices are
512 * equivalent to ones of the corresponding UBI character device. Minor
513 * numbers of UBI character devices are 0, while minor numbers of
514 * volume character devices start from 1. Thus, we allocate one major
515 * number and ubi->vtbl_slots + 1 minor numbers.
517 err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name);
519 ubi_err(ubi, "cannot register UBI character devices");
523 ubi_assert(MINOR(dev) == 0);
524 cdev_init(&ubi->cdev, &ubi_cdev_operations);
525 dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev));
526 ubi->cdev.owner = THIS_MODULE;
528 err = cdev_add(&ubi->cdev, dev, 1);
530 ubi_err(ubi, "cannot add character device");
534 err = ubi_sysfs_init(ubi, ref);
538 for (i = 0; i < ubi->vtbl_slots; i++)
539 if (ubi->volumes[i]) {
540 err = ubi_add_volume(ubi, ubi->volumes[i]);
542 ubi_err(ubi, "cannot add volume %d", i);
553 get_device(&ubi->dev);
554 ubi_sysfs_close(ubi);
555 cdev_del(&ubi->cdev);
557 unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
558 ubi_err(ubi, "cannot initialize UBI %s, error %d",
564 * uif_close - close user interfaces for an UBI device.
565 * @ubi: UBI device description object
567 * Note, since this function un-registers UBI volume device objects (@vol->dev),
568 * the memory allocated voe the volumes is freed as well (in the release
571 static void uif_close(struct ubi_device *ubi)
574 ubi_sysfs_close(ubi);
575 cdev_del(&ubi->cdev);
576 unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
580 * ubi_free_internal_volumes - free internal volumes.
581 * @ubi: UBI device description object
583 void ubi_free_internal_volumes(struct ubi_device *ubi)
587 for (i = ubi->vtbl_slots;
588 i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
589 kfree(ubi->volumes[i]->eba_tbl);
590 kfree(ubi->volumes[i]);
594 static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
596 int limit, device_pebs;
597 uint64_t device_size;
599 if (!max_beb_per1024)
603 * Here we are using size of the entire flash chip and
604 * not just the MTD partition size because the maximum
605 * number of bad eraseblocks is a percentage of the
606 * whole device and bad eraseblocks are not fairly
607 * distributed over the flash chip. So the worst case
608 * is that all the bad eraseblocks of the chip are in
609 * the MTD partition we are attaching (ubi->mtd).
611 device_size = mtd_get_device_size(ubi->mtd);
612 device_pebs = mtd_div_by_eb(device_size, ubi->mtd);
613 limit = mult_frac(device_pebs, max_beb_per1024, 1024);
616 if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs)
623 * io_init - initialize I/O sub-system for a given UBI device.
624 * @ubi: UBI device description object
625 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
627 * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
629 * o EC header is always at offset zero - this cannot be changed;
630 * o VID header starts just after the EC header at the closest address
631 * aligned to @io->hdrs_min_io_size;
632 * o data starts just after the VID header at the closest address aligned to
635 * This function returns zero in case of success and a negative error code in
638 static int io_init(struct ubi_device *ubi, int max_beb_per1024)
640 dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb));
641 dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
643 if (ubi->mtd->numeraseregions != 0) {
645 * Some flashes have several erase regions. Different regions
646 * may have different eraseblock size and other
647 * characteristics. It looks like mostly multi-region flashes
648 * have one "main" region and one or more small regions to
649 * store boot loader code or boot parameters or whatever. I
650 * guess we should just pick the largest region. But this is
653 ubi_err(ubi, "multiple regions, not implemented");
657 if (ubi->vid_hdr_offset < 0)
661 * Note, in this implementation we support MTD devices with 0x7FFFFFFF
662 * physical eraseblocks maximum.
665 ubi->peb_size = ubi->mtd->erasesize;
666 ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd);
667 ubi->flash_size = ubi->mtd->size;
669 if (mtd_can_have_bb(ubi->mtd)) {
670 ubi->bad_allowed = 1;
671 ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024);
674 if (ubi->mtd->type == MTD_NORFLASH) {
675 ubi_assert(ubi->mtd->writesize == 1);
679 ubi->min_io_size = ubi->mtd->writesize;
680 ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
683 * Make sure minimal I/O unit is power of 2. Note, there is no
684 * fundamental reason for this assumption. It is just an optimization
685 * which allows us to avoid costly division operations.
687 if (!is_power_of_2(ubi->min_io_size)) {
688 ubi_err(ubi, "min. I/O unit (%d) is not power of 2",
693 ubi_assert(ubi->hdrs_min_io_size > 0);
694 ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
695 ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
697 ubi->max_write_size = ubi->mtd->writebufsize;
699 * Maximum write size has to be greater or equivalent to min. I/O
700 * size, and be multiple of min. I/O size.
702 if (ubi->max_write_size < ubi->min_io_size ||
703 ubi->max_write_size % ubi->min_io_size ||
704 !is_power_of_2(ubi->max_write_size)) {
705 ubi_err(ubi, "bad write buffer size %d for %d min. I/O unit",
706 ubi->max_write_size, ubi->min_io_size);
710 /* Calculate default aligned sizes of EC and VID headers */
711 ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
712 ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
714 dbg_gen("min_io_size %d", ubi->min_io_size);
715 dbg_gen("max_write_size %d", ubi->max_write_size);
716 dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
717 dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
718 dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
720 if (ubi->vid_hdr_offset == 0)
722 ubi->vid_hdr_offset = ubi->vid_hdr_aloffset =
725 ubi->vid_hdr_aloffset = ubi->vid_hdr_offset &
726 ~(ubi->hdrs_min_io_size - 1);
727 ubi->vid_hdr_shift = ubi->vid_hdr_offset -
728 ubi->vid_hdr_aloffset;
731 /* Similar for the data offset */
732 ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE;
733 ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size);
735 dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset);
736 dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
737 dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift);
738 dbg_gen("leb_start %d", ubi->leb_start);
740 /* The shift must be aligned to 32-bit boundary */
741 if (ubi->vid_hdr_shift % 4) {
742 ubi_err(ubi, "unaligned VID header shift %d",
748 if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE ||
749 ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE ||
750 ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE ||
751 ubi->leb_start & (ubi->min_io_size - 1)) {
752 ubi_err(ubi, "bad VID header (%d) or data offsets (%d)",
753 ubi->vid_hdr_offset, ubi->leb_start);
758 * Set maximum amount of physical erroneous eraseblocks to be 10%.
759 * Erroneous PEB are those which have read errors.
761 ubi->max_erroneous = ubi->peb_count / 10;
762 if (ubi->max_erroneous < 16)
763 ubi->max_erroneous = 16;
764 dbg_gen("max_erroneous %d", ubi->max_erroneous);
767 * It may happen that EC and VID headers are situated in one minimal
768 * I/O unit. In this case we can only accept this UBI image in
771 if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) {
772 ubi_warn(ubi, "EC and VID headers are in the same minimal I/O unit, switch to read-only mode");
776 ubi->leb_size = ubi->peb_size - ubi->leb_start;
778 if (!(ubi->mtd->flags & MTD_WRITEABLE)) {
779 ubi_msg(ubi, "MTD device %d is write-protected, attach in read-only mode",
785 * Note, ideally, we have to initialize @ubi->bad_peb_count here. But
786 * unfortunately, MTD does not provide this information. We should loop
787 * over all physical eraseblocks and invoke mtd->block_is_bad() for
788 * each physical eraseblock. So, we leave @ubi->bad_peb_count
789 * uninitialized so far.
796 * autoresize - re-size the volume which has the "auto-resize" flag set.
797 * @ubi: UBI device description object
798 * @vol_id: ID of the volume to re-size
800 * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in
801 * the volume table to the largest possible size. See comments in ubi-header.h
802 * for more description of the flag. Returns zero in case of success and a
803 * negative error code in case of failure.
805 static int autoresize(struct ubi_device *ubi, int vol_id)
807 struct ubi_volume_desc desc;
808 struct ubi_volume *vol = ubi->volumes[vol_id];
809 int err, old_reserved_pebs = vol->reserved_pebs;
812 ubi_warn(ubi, "skip auto-resize because of R/O mode");
817 * Clear the auto-resize flag in the volume in-memory copy of the
818 * volume table, and 'ubi_resize_volume()' will propagate this change
821 ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG;
823 if (ubi->avail_pebs == 0) {
824 struct ubi_vtbl_record vtbl_rec;
827 * No available PEBs to re-size the volume, clear the flag on
830 vtbl_rec = ubi->vtbl[vol_id];
831 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
833 ubi_err(ubi, "cannot clean auto-resize flag for volume %d",
837 err = ubi_resize_volume(&desc,
838 old_reserved_pebs + ubi->avail_pebs);
840 ubi_err(ubi, "cannot auto-resize volume %d",
847 ubi_msg(ubi, "volume %d (\"%s\") re-sized from %d to %d LEBs",
848 vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs);
853 * ubi_attach_mtd_dev - attach an MTD device.
854 * @mtd: MTD device description object
855 * @ubi_num: number to assign to the new UBI device
856 * @vid_hdr_offset: VID header offset
857 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
859 * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
860 * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
861 * which case this function finds a vacant device number and assigns it
862 * automatically. Returns the new UBI device number in case of success and a
863 * negative error code in case of failure.
865 * Note, the invocations of this function has to be serialized by the
866 * @ubi_devices_mutex.
868 int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
869 int vid_hdr_offset, int max_beb_per1024)
871 struct ubi_device *ubi;
874 if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT)
877 if (!max_beb_per1024)
878 max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT;
881 * Check if we already have the same MTD device attached.
883 * Note, this function assumes that UBI devices creations and deletions
884 * are serialized, so it does not take the &ubi_devices_lock.
886 for (i = 0; i < UBI_MAX_DEVICES; i++) {
887 ubi = ubi_devices[i];
888 if (ubi && mtd->index == ubi->mtd->index) {
889 ubi_err(ubi, "mtd%d is already attached to ubi%d",
896 * Make sure this MTD device is not emulated on top of an UBI volume
897 * already. Well, generally this recursion works fine, but there are
898 * different problems like the UBI module takes a reference to itself
899 * by attaching (and thus, opening) the emulated MTD device. This
900 * results in inability to unload the module. And in general it makes
901 * no sense to attach emulated MTD devices, so we prohibit this.
903 if (mtd->type == MTD_UBIVOLUME) {
904 ubi_err(ubi, "refuse attaching mtd%d - it is already emulated on top of UBI",
909 if (ubi_num == UBI_DEV_NUM_AUTO) {
910 /* Search for an empty slot in the @ubi_devices array */
911 for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)
912 if (!ubi_devices[ubi_num])
914 if (ubi_num == UBI_MAX_DEVICES) {
915 ubi_err(ubi, "only %d UBI devices may be created",
920 if (ubi_num >= UBI_MAX_DEVICES)
923 /* Make sure ubi_num is not busy */
924 if (ubi_devices[ubi_num]) {
925 ubi_err(ubi, "already exists");
930 ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL);
935 ubi->ubi_num = ubi_num;
936 ubi->vid_hdr_offset = vid_hdr_offset;
937 ubi->autoresize_vol_id = -1;
939 #ifdef CONFIG_MTD_UBI_FASTMAP
940 ubi->fm_pool.used = ubi->fm_pool.size = 0;
941 ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0;
944 * fm_pool.max_size is 5% of the total number of PEBs but it's also
945 * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE.
947 ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size,
948 ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE);
949 if (ubi->fm_pool.max_size < UBI_FM_MIN_POOL_SIZE)
950 ubi->fm_pool.max_size = UBI_FM_MIN_POOL_SIZE;
952 ubi->fm_wl_pool.max_size = UBI_FM_WL_POOL_SIZE;
953 ubi->fm_disabled = !fm_autoconvert;
955 if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd)
956 <= UBI_FM_MAX_START) {
957 ubi_err(ubi, "More than %i PEBs are needed for fastmap, sorry.",
959 ubi->fm_disabled = 1;
962 ubi_msg(ubi, "default fastmap pool size: %d", ubi->fm_pool.max_size);
963 ubi_msg(ubi, "default fastmap WL pool size: %d",
964 ubi->fm_wl_pool.max_size);
966 ubi->fm_disabled = 1;
968 mutex_init(&ubi->buf_mutex);
969 mutex_init(&ubi->ckvol_mutex);
970 mutex_init(&ubi->device_mutex);
971 spin_lock_init(&ubi->volumes_lock);
972 mutex_init(&ubi->fm_mutex);
973 init_rwsem(&ubi->fm_sem);
975 ubi_msg(ubi, "attaching mtd%d", mtd->index);
977 err = io_init(ubi, max_beb_per1024);
982 ubi->peb_buf = vmalloc(ubi->peb_size);
986 #ifdef CONFIG_MTD_UBI_FASTMAP
987 ubi->fm_size = ubi_calc_fm_size(ubi);
988 ubi->fm_buf = vzalloc(ubi->fm_size);
992 err = ubi_attach(ubi, 0);
994 ubi_err(ubi, "failed to attach mtd%d, error %d",
999 if (ubi->autoresize_vol_id != -1) {
1000 err = autoresize(ubi, ubi->autoresize_vol_id);
1005 err = uif_init(ubi, &ref);
1009 err = ubi_debugfs_init_dev(ubi);
1013 ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s", ubi->bgt_name);
1014 if (IS_ERR(ubi->bgt_thread)) {
1015 err = PTR_ERR(ubi->bgt_thread);
1016 ubi_err(ubi, "cannot spawn \"%s\", error %d",
1017 ubi->bgt_name, err);
1021 ubi_msg(ubi, "attached mtd%d (name \"%s\", size %llu MiB)",
1022 mtd->index, mtd->name, ubi->flash_size >> 20);
1023 ubi_msg(ubi, "PEB size: %d bytes (%d KiB), LEB size: %d bytes",
1024 ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size);
1025 ubi_msg(ubi, "min./max. I/O unit sizes: %d/%d, sub-page size %d",
1026 ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size);
1027 ubi_msg(ubi, "VID header offset: %d (aligned %d), data offset: %d",
1028 ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start);
1029 ubi_msg(ubi, "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d",
1030 ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count);
1031 ubi_msg(ubi, "user volume: %d, internal volumes: %d, max. volumes count: %d",
1032 ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT,
1034 ubi_msg(ubi, "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u",
1035 ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD,
1037 ubi_msg(ubi, "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d",
1038 ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs);
1041 * The below lock makes sure we do not race with 'ubi_thread()' which
1042 * checks @ubi->thread_enabled. Otherwise we may fail to wake it up.
1044 spin_lock(&ubi->wl_lock);
1045 ubi->thread_enabled = 1;
1046 wake_up_process(ubi->bgt_thread);
1047 spin_unlock(&ubi->wl_lock);
1049 ubi_devices[ubi_num] = ubi;
1050 ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
1054 ubi_debugfs_exit_dev(ubi);
1056 get_device(&ubi->dev);
1061 ubi_free_internal_volumes(ubi);
1064 vfree(ubi->peb_buf);
1067 put_device(&ubi->dev);
1074 * ubi_detach_mtd_dev - detach an MTD device.
1075 * @ubi_num: UBI device number to detach from
1076 * @anyway: detach MTD even if device reference count is not zero
1078 * This function destroys an UBI device number @ubi_num and detaches the
1079 * underlying MTD device. Returns zero in case of success and %-EBUSY if the
1080 * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not
1083 * Note, the invocations of this function has to be serialized by the
1084 * @ubi_devices_mutex.
1086 int ubi_detach_mtd_dev(int ubi_num, int anyway)
1088 struct ubi_device *ubi;
1090 if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
1093 ubi = ubi_get_device(ubi_num);
1097 spin_lock(&ubi_devices_lock);
1098 put_device(&ubi->dev);
1099 ubi->ref_count -= 1;
1100 if (ubi->ref_count) {
1102 spin_unlock(&ubi_devices_lock);
1105 /* This may only happen if there is a bug */
1106 ubi_err(ubi, "%s reference count %d, destroy anyway",
1107 ubi->ubi_name, ubi->ref_count);
1109 ubi_devices[ubi_num] = NULL;
1110 spin_unlock(&ubi_devices_lock);
1112 ubi_assert(ubi_num == ubi->ubi_num);
1113 ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
1114 ubi_msg(ubi, "detaching mtd%d", ubi->mtd->index);
1115 #ifdef CONFIG_MTD_UBI_FASTMAP
1116 /* If we don't write a new fastmap at detach time we lose all
1117 * EC updates that have been made since the last written fastmap. */
1118 ubi_update_fastmap(ubi);
1121 * Before freeing anything, we have to stop the background thread to
1122 * prevent it from doing anything on this device while we are freeing.
1124 if (ubi->bgt_thread)
1125 kthread_stop(ubi->bgt_thread);
1128 * Get a reference to the device in order to prevent 'dev_release()'
1129 * from freeing the @ubi object.
1131 get_device(&ubi->dev);
1133 ubi_debugfs_exit_dev(ubi);
1137 ubi_free_internal_volumes(ubi);
1139 put_mtd_device(ubi->mtd);
1140 vfree(ubi->peb_buf);
1142 ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index);
1143 put_device(&ubi->dev);
1148 * open_mtd_by_chdev - open an MTD device by its character device node path.
1149 * @mtd_dev: MTD character device node path
1151 * This helper function opens an MTD device by its character node device path.
1152 * Returns MTD device description object in case of success and a negative
1153 * error code in case of failure.
1155 static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev)
1157 int err, major, minor, mode;
1160 /* Probably this is an MTD character device node path */
1161 err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path);
1163 return ERR_PTR(err);
1165 /* MTD device number is defined by the major / minor numbers */
1166 major = imajor(path.dentry->d_inode);
1167 minor = iminor(path.dentry->d_inode);
1168 mode = path.dentry->d_inode->i_mode;
1170 if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode))
1171 return ERR_PTR(-EINVAL);
1175 * Just do not think the "/dev/mtdrX" devices support is need,
1176 * so do not support them to avoid doing extra work.
1178 return ERR_PTR(-EINVAL);
1180 return get_mtd_device(NULL, minor / 2);
1184 * open_mtd_device - open MTD device by name, character device path, or number.
1185 * @mtd_dev: name, character device node path, or MTD device device number
1187 * This function tries to open and MTD device described by @mtd_dev string,
1188 * which is first treated as ASCII MTD device number, and if it is not true, it
1189 * is treated as MTD device name, and if that is also not true, it is treated
1190 * as MTD character device node path. Returns MTD device description object in
1191 * case of success and a negative error code in case of failure.
1193 static struct mtd_info * __init open_mtd_device(const char *mtd_dev)
1195 struct mtd_info *mtd;
1199 mtd_num = simple_strtoul(mtd_dev, &endp, 0);
1200 if (*endp != '\0' || mtd_dev == endp) {
1202 * This does not look like an ASCII integer, probably this is
1205 mtd = get_mtd_device_nm(mtd_dev);
1206 if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV)
1207 /* Probably this is an MTD character device node path */
1208 mtd = open_mtd_by_chdev(mtd_dev);
1210 mtd = get_mtd_device(NULL, mtd_num);
1215 static int __init ubi_init(void)
1219 /* Ensure that EC and VID headers have correct size */
1220 BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
1221 BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
1223 if (mtd_devs > UBI_MAX_DEVICES) {
1224 pr_err("UBI error: too many MTD devices, maximum is %d",
1229 /* Create base sysfs directory and sysfs files */
1230 ubi_class = class_create(THIS_MODULE, UBI_NAME_STR);
1231 if (IS_ERR(ubi_class)) {
1232 err = PTR_ERR(ubi_class);
1233 pr_err("UBI error: cannot create UBI class");
1237 err = class_create_file(ubi_class, &ubi_version);
1239 pr_err("UBI error: cannot create sysfs file");
1243 err = misc_register(&ubi_ctrl_cdev);
1245 pr_err("UBI error: cannot register device");
1249 ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",
1250 sizeof(struct ubi_wl_entry),
1252 if (!ubi_wl_entry_slab) {
1257 err = ubi_debugfs_init();
1262 /* Attach MTD devices */
1263 for (i = 0; i < mtd_devs; i++) {
1264 struct mtd_dev_param *p = &mtd_dev_param[i];
1265 struct mtd_info *mtd;
1269 mtd = open_mtd_device(p->name);
1272 pr_err("UBI error: cannot open mtd %s, error %d",
1274 /* See comment below re-ubi_is_module(). */
1275 if (ubi_is_module())
1280 mutex_lock(&ubi_devices_mutex);
1281 err = ubi_attach_mtd_dev(mtd, p->ubi_num,
1282 p->vid_hdr_offs, p->max_beb_per1024);
1283 mutex_unlock(&ubi_devices_mutex);
1285 pr_err("UBI error: cannot attach mtd%d",
1287 put_mtd_device(mtd);
1290 * Originally UBI stopped initializing on any error.
1291 * However, later on it was found out that this
1292 * behavior is not very good when UBI is compiled into
1293 * the kernel and the MTD devices to attach are passed
1294 * through the command line. Indeed, UBI failure
1295 * stopped whole boot sequence.
1297 * To fix this, we changed the behavior for the
1298 * non-module case, but preserved the old behavior for
1299 * the module case, just for compatibility. This is a
1300 * little inconsistent, though.
1302 if (ubi_is_module())
1307 err = ubiblock_init();
1309 pr_err("UBI error: block: cannot initialize, error %d", err);
1311 /* See comment above re-ubi_is_module(). */
1312 if (ubi_is_module())
1319 for (k = 0; k < i; k++)
1320 if (ubi_devices[k]) {
1321 mutex_lock(&ubi_devices_mutex);
1322 ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1);
1323 mutex_unlock(&ubi_devices_mutex);
1327 kmem_cache_destroy(ubi_wl_entry_slab);
1329 misc_deregister(&ubi_ctrl_cdev);
1331 class_remove_file(ubi_class, &ubi_version);
1333 class_destroy(ubi_class);
1335 pr_err("UBI error: cannot initialize UBI, error %d", err);
1338 late_initcall(ubi_init);
1340 static void __exit ubi_exit(void)
1346 for (i = 0; i < UBI_MAX_DEVICES; i++)
1347 if (ubi_devices[i]) {
1348 mutex_lock(&ubi_devices_mutex);
1349 ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1);
1350 mutex_unlock(&ubi_devices_mutex);
1353 kmem_cache_destroy(ubi_wl_entry_slab);
1354 misc_deregister(&ubi_ctrl_cdev);
1355 class_remove_file(ubi_class, &ubi_version);
1356 class_destroy(ubi_class);
1358 module_exit(ubi_exit);
1361 * bytes_str_to_int - convert a number of bytes string into an integer.
1362 * @str: the string to convert
1364 * This function returns positive resulting integer in case of success and a
1365 * negative error code in case of failure.
1367 static int __init bytes_str_to_int(const char *str)
1370 unsigned long result;
1372 result = simple_strtoul(str, &endp, 0);
1373 if (str == endp || result >= INT_MAX) {
1374 pr_err("UBI error: incorrect bytes count: \"%s\"\n", str);
1385 if (endp[1] == 'i' && endp[2] == 'B')
1390 pr_err("UBI error: incorrect bytes count: \"%s\"\n", str);
1398 * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter.
1399 * @val: the parameter value to parse
1402 * This function returns zero in case of success and a negative error code in
1405 static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
1408 struct mtd_dev_param *p;
1409 char buf[MTD_PARAM_LEN_MAX];
1410 char *pbuf = &buf[0];
1411 char *tokens[MTD_PARAM_MAX_COUNT], *token;
1416 if (mtd_devs == UBI_MAX_DEVICES) {
1417 pr_err("UBI error: too many parameters, max. is %d\n",
1422 len = strnlen(val, MTD_PARAM_LEN_MAX);
1423 if (len == MTD_PARAM_LEN_MAX) {
1424 pr_err("UBI error: parameter \"%s\" is too long, max. is %d\n",
1425 val, MTD_PARAM_LEN_MAX);
1430 pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n");
1436 /* Get rid of the final newline */
1437 if (buf[len - 1] == '\n')
1438 buf[len - 1] = '\0';
1440 for (i = 0; i < MTD_PARAM_MAX_COUNT; i++)
1441 tokens[i] = strsep(&pbuf, ",");
1444 pr_err("UBI error: too many arguments at \"%s\"\n", val);
1448 p = &mtd_dev_param[mtd_devs];
1449 strcpy(&p->name[0], tokens[0]);
1453 p->vid_hdr_offs = bytes_str_to_int(token);
1455 if (p->vid_hdr_offs < 0)
1456 return p->vid_hdr_offs;
1461 int err = kstrtoint(token, 10, &p->max_beb_per1024);
1464 pr_err("UBI error: bad value for max_beb_per1024 parameter: %s",
1472 int err = kstrtoint(token, 10, &p->ubi_num);
1475 pr_err("UBI error: bad value for ubi_num parameter: %s",
1480 p->ubi_num = UBI_DEV_NUM_AUTO;
1486 module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
1487 MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n"
1488 "Multiple \"mtd\" parameters may be specified.\n"
1489 "MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
1490 "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
1491 "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
1492 __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n"
1493 "Optional \"ubi_num\" parameter specifies UBI device number which have to be assigned to the newly created UBI device (assigned automatically by default)\n"
1495 "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
1496 "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n"
1497 "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n"
1498 "Example 4: mtd=/dev/mtd1,0,0,5 - attach MTD device /dev/mtd1 to UBI 5 and using default values for the other fields.\n"
1499 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
1500 #ifdef CONFIG_MTD_UBI_FASTMAP
1501 module_param(fm_autoconvert, bool, 0644);
1502 MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap.");
1504 MODULE_VERSION(__stringify(UBI_VERSION));
1505 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
1506 MODULE_AUTHOR("Artem Bityutskiy");
1507 MODULE_LICENSE("GPL");