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>
46 /* Maximum length of the 'mtd=' parameter */
47 #define MTD_PARAM_LEN_MAX 64
49 /* Maximum number of comma-separated items in the 'mtd=' parameter */
50 #define MTD_PARAM_MAX_COUNT 3
52 /* Maximum value for the number of bad PEBs per 1024 PEBs */
53 #define MAX_MTD_UBI_BEB_LIMIT 768
55 #ifdef CONFIG_MTD_UBI_MODULE
56 #define ubi_is_module() 1
58 #define ubi_is_module() 0
62 * struct mtd_dev_param - MTD device parameter description data structure.
63 * @name: MTD character device node path, MTD device name, or MTD device number
65 * @vid_hdr_offs: VID header offset
66 * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs
68 struct mtd_dev_param
{
69 char name
[MTD_PARAM_LEN_MAX
];
74 /* Numbers of elements set in the @mtd_dev_param array */
75 static int __initdata mtd_devs
;
77 /* MTD devices specification parameters */
78 static struct mtd_dev_param __initdata mtd_dev_param
[UBI_MAX_DEVICES
];
80 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
81 struct class *ubi_class
;
83 /* Slab cache for wear-leveling entries */
84 struct kmem_cache
*ubi_wl_entry_slab
;
86 /* UBI control character device */
87 static struct miscdevice ubi_ctrl_cdev
= {
88 .minor
= MISC_DYNAMIC_MINOR
,
90 .fops
= &ubi_ctrl_cdev_operations
,
93 /* All UBI devices in system */
94 static struct ubi_device
*ubi_devices
[UBI_MAX_DEVICES
];
96 /* Serializes UBI devices creations and removals */
97 DEFINE_MUTEX(ubi_devices_mutex
);
99 /* Protects @ubi_devices and @ubi->ref_count */
100 static DEFINE_SPINLOCK(ubi_devices_lock
);
102 /* "Show" method for files in '/<sysfs>/class/ubi/' */
103 static ssize_t
ubi_version_show(struct class *class,
104 struct class_attribute
*attr
, char *buf
)
106 return sprintf(buf
, "%d\n", UBI_VERSION
);
109 /* UBI version attribute ('/<sysfs>/class/ubi/version') */
110 static struct class_attribute ubi_version
=
111 __ATTR(version
, S_IRUGO
, ubi_version_show
, NULL
);
113 static ssize_t
dev_attribute_show(struct device
*dev
,
114 struct device_attribute
*attr
, char *buf
);
116 /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
117 static struct device_attribute dev_eraseblock_size
=
118 __ATTR(eraseblock_size
, S_IRUGO
, dev_attribute_show
, NULL
);
119 static struct device_attribute dev_avail_eraseblocks
=
120 __ATTR(avail_eraseblocks
, S_IRUGO
, dev_attribute_show
, NULL
);
121 static struct device_attribute dev_total_eraseblocks
=
122 __ATTR(total_eraseblocks
, S_IRUGO
, dev_attribute_show
, NULL
);
123 static struct device_attribute dev_volumes_count
=
124 __ATTR(volumes_count
, S_IRUGO
, dev_attribute_show
, NULL
);
125 static struct device_attribute dev_max_ec
=
126 __ATTR(max_ec
, S_IRUGO
, dev_attribute_show
, NULL
);
127 static struct device_attribute dev_reserved_for_bad
=
128 __ATTR(reserved_for_bad
, S_IRUGO
, dev_attribute_show
, NULL
);
129 static struct device_attribute dev_bad_peb_count
=
130 __ATTR(bad_peb_count
, S_IRUGO
, dev_attribute_show
, NULL
);
131 static struct device_attribute dev_max_vol_count
=
132 __ATTR(max_vol_count
, S_IRUGO
, dev_attribute_show
, NULL
);
133 static struct device_attribute dev_min_io_size
=
134 __ATTR(min_io_size
, S_IRUGO
, dev_attribute_show
, NULL
);
135 static struct device_attribute dev_bgt_enabled
=
136 __ATTR(bgt_enabled
, S_IRUGO
, dev_attribute_show
, NULL
);
137 static struct device_attribute dev_mtd_num
=
138 __ATTR(mtd_num
, S_IRUGO
, dev_attribute_show
, NULL
);
141 * ubi_volume_notify - send a volume change notification.
142 * @ubi: UBI device description object
143 * @vol: volume description object of the changed volume
144 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
146 * This is a helper function which notifies all subscribers about a volume
147 * change event (creation, removal, re-sizing, re-naming, updating). Returns
148 * zero in case of success and a negative error code in case of failure.
150 int ubi_volume_notify(struct ubi_device
*ubi
, struct ubi_volume
*vol
, int ntype
)
152 struct ubi_notification nt
;
154 ubi_do_get_device_info(ubi
, &nt
.di
);
155 ubi_do_get_volume_info(ubi
, vol
, &nt
.vi
);
156 return blocking_notifier_call_chain(&ubi_notifiers
, ntype
, &nt
);
160 * ubi_notify_all - send a notification to all volumes.
161 * @ubi: UBI device description object
162 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
163 * @nb: the notifier to call
165 * This function walks all volumes of UBI device @ubi and sends the @ntype
166 * notification for each volume. If @nb is %NULL, then all registered notifiers
167 * are called, otherwise only the @nb notifier is called. Returns the number of
168 * sent notifications.
170 int ubi_notify_all(struct ubi_device
*ubi
, int ntype
, struct notifier_block
*nb
)
172 struct ubi_notification nt
;
175 ubi_do_get_device_info(ubi
, &nt
.di
);
177 mutex_lock(&ubi
->device_mutex
);
178 for (i
= 0; i
< ubi
->vtbl_slots
; i
++) {
180 * Since the @ubi->device is locked, and we are not going to
181 * change @ubi->volumes, we do not have to lock
182 * @ubi->volumes_lock.
184 if (!ubi
->volumes
[i
])
187 ubi_do_get_volume_info(ubi
, ubi
->volumes
[i
], &nt
.vi
);
189 nb
->notifier_call(nb
, ntype
, &nt
);
191 blocking_notifier_call_chain(&ubi_notifiers
, ntype
,
195 mutex_unlock(&ubi
->device_mutex
);
201 * ubi_enumerate_volumes - send "add" notification for all existing volumes.
202 * @nb: the notifier to call
204 * This function walks all UBI devices and volumes and sends the
205 * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all
206 * registered notifiers are called, otherwise only the @nb notifier is called.
207 * Returns the number of sent notifications.
209 int ubi_enumerate_volumes(struct notifier_block
*nb
)
214 * Since the @ubi_devices_mutex is locked, and we are not going to
215 * change @ubi_devices, we do not have to lock @ubi_devices_lock.
217 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
218 struct ubi_device
*ubi
= ubi_devices
[i
];
222 count
+= ubi_notify_all(ubi
, UBI_VOLUME_ADDED
, nb
);
229 * ubi_get_device - get UBI device.
230 * @ubi_num: UBI device number
232 * This function returns UBI device description object for UBI device number
233 * @ubi_num, or %NULL if the device does not exist. This function increases the
234 * device reference count to prevent removal of the device. In other words, the
235 * device cannot be removed if its reference count is not zero.
237 struct ubi_device
*ubi_get_device(int ubi_num
)
239 struct ubi_device
*ubi
;
241 spin_lock(&ubi_devices_lock
);
242 ubi
= ubi_devices
[ubi_num
];
244 ubi_assert(ubi
->ref_count
>= 0);
246 get_device(&ubi
->dev
);
248 spin_unlock(&ubi_devices_lock
);
254 * ubi_put_device - drop an UBI device reference.
255 * @ubi: UBI device description object
257 void ubi_put_device(struct ubi_device
*ubi
)
259 spin_lock(&ubi_devices_lock
);
261 put_device(&ubi
->dev
);
262 spin_unlock(&ubi_devices_lock
);
266 * ubi_get_by_major - get UBI device by character device major number.
267 * @major: major number
269 * This function is similar to 'ubi_get_device()', but it searches the device
270 * by its major number.
272 struct ubi_device
*ubi_get_by_major(int major
)
275 struct ubi_device
*ubi
;
277 spin_lock(&ubi_devices_lock
);
278 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
279 ubi
= ubi_devices
[i
];
280 if (ubi
&& MAJOR(ubi
->cdev
.dev
) == major
) {
281 ubi_assert(ubi
->ref_count
>= 0);
283 get_device(&ubi
->dev
);
284 spin_unlock(&ubi_devices_lock
);
288 spin_unlock(&ubi_devices_lock
);
294 * ubi_major2num - get UBI device number by character device major number.
295 * @major: major number
297 * This function searches UBI device number object by its major number. If UBI
298 * device was not found, this function returns -ENODEV, otherwise the UBI device
299 * number is returned.
301 int ubi_major2num(int major
)
303 int i
, ubi_num
= -ENODEV
;
305 spin_lock(&ubi_devices_lock
);
306 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
307 struct ubi_device
*ubi
= ubi_devices
[i
];
309 if (ubi
&& MAJOR(ubi
->cdev
.dev
) == major
) {
310 ubi_num
= ubi
->ubi_num
;
314 spin_unlock(&ubi_devices_lock
);
319 /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
320 static ssize_t
dev_attribute_show(struct device
*dev
,
321 struct device_attribute
*attr
, char *buf
)
324 struct ubi_device
*ubi
;
327 * The below code looks weird, but it actually makes sense. We get the
328 * UBI device reference from the contained 'struct ubi_device'. But it
329 * is unclear if the device was removed or not yet. Indeed, if the
330 * device was removed before we increased its reference count,
331 * 'ubi_get_device()' will return -ENODEV and we fail.
333 * Remember, 'struct ubi_device' is freed in the release function, so
334 * we still can use 'ubi->ubi_num'.
336 ubi
= container_of(dev
, struct ubi_device
, dev
);
337 ubi
= ubi_get_device(ubi
->ubi_num
);
341 if (attr
== &dev_eraseblock_size
)
342 ret
= sprintf(buf
, "%d\n", ubi
->leb_size
);
343 else if (attr
== &dev_avail_eraseblocks
)
344 ret
= sprintf(buf
, "%d\n", ubi
->avail_pebs
);
345 else if (attr
== &dev_total_eraseblocks
)
346 ret
= sprintf(buf
, "%d\n", ubi
->good_peb_count
);
347 else if (attr
== &dev_volumes_count
)
348 ret
= sprintf(buf
, "%d\n", ubi
->vol_count
- UBI_INT_VOL_COUNT
);
349 else if (attr
== &dev_max_ec
)
350 ret
= sprintf(buf
, "%d\n", ubi
->max_ec
);
351 else if (attr
== &dev_reserved_for_bad
)
352 ret
= sprintf(buf
, "%d\n", ubi
->beb_rsvd_pebs
);
353 else if (attr
== &dev_bad_peb_count
)
354 ret
= sprintf(buf
, "%d\n", ubi
->bad_peb_count
);
355 else if (attr
== &dev_max_vol_count
)
356 ret
= sprintf(buf
, "%d\n", ubi
->vtbl_slots
);
357 else if (attr
== &dev_min_io_size
)
358 ret
= sprintf(buf
, "%d\n", ubi
->min_io_size
);
359 else if (attr
== &dev_bgt_enabled
)
360 ret
= sprintf(buf
, "%d\n", ubi
->thread_enabled
);
361 else if (attr
== &dev_mtd_num
)
362 ret
= sprintf(buf
, "%d\n", ubi
->mtd
->index
);
370 static void dev_release(struct device
*dev
)
372 struct ubi_device
*ubi
= container_of(dev
, struct ubi_device
, dev
);
378 * ubi_sysfs_init - initialize sysfs for an UBI device.
379 * @ubi: UBI device description object
380 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
383 * This function returns zero in case of success and a negative error code in
386 static int ubi_sysfs_init(struct ubi_device
*ubi
, int *ref
)
390 ubi
->dev
.release
= dev_release
;
391 ubi
->dev
.devt
= ubi
->cdev
.dev
;
392 ubi
->dev
.class = ubi_class
;
393 dev_set_name(&ubi
->dev
, UBI_NAME_STR
"%d", ubi
->ubi_num
);
394 err
= device_register(&ubi
->dev
);
399 err
= device_create_file(&ubi
->dev
, &dev_eraseblock_size
);
402 err
= device_create_file(&ubi
->dev
, &dev_avail_eraseblocks
);
405 err
= device_create_file(&ubi
->dev
, &dev_total_eraseblocks
);
408 err
= device_create_file(&ubi
->dev
, &dev_volumes_count
);
411 err
= device_create_file(&ubi
->dev
, &dev_max_ec
);
414 err
= device_create_file(&ubi
->dev
, &dev_reserved_for_bad
);
417 err
= device_create_file(&ubi
->dev
, &dev_bad_peb_count
);
420 err
= device_create_file(&ubi
->dev
, &dev_max_vol_count
);
423 err
= device_create_file(&ubi
->dev
, &dev_min_io_size
);
426 err
= device_create_file(&ubi
->dev
, &dev_bgt_enabled
);
429 err
= device_create_file(&ubi
->dev
, &dev_mtd_num
);
434 * ubi_sysfs_close - close sysfs for an UBI device.
435 * @ubi: UBI device description object
437 static void ubi_sysfs_close(struct ubi_device
*ubi
)
439 device_remove_file(&ubi
->dev
, &dev_mtd_num
);
440 device_remove_file(&ubi
->dev
, &dev_bgt_enabled
);
441 device_remove_file(&ubi
->dev
, &dev_min_io_size
);
442 device_remove_file(&ubi
->dev
, &dev_max_vol_count
);
443 device_remove_file(&ubi
->dev
, &dev_bad_peb_count
);
444 device_remove_file(&ubi
->dev
, &dev_reserved_for_bad
);
445 device_remove_file(&ubi
->dev
, &dev_max_ec
);
446 device_remove_file(&ubi
->dev
, &dev_volumes_count
);
447 device_remove_file(&ubi
->dev
, &dev_total_eraseblocks
);
448 device_remove_file(&ubi
->dev
, &dev_avail_eraseblocks
);
449 device_remove_file(&ubi
->dev
, &dev_eraseblock_size
);
450 device_unregister(&ubi
->dev
);
454 * kill_volumes - destroy all user volumes.
455 * @ubi: UBI device description object
457 static void kill_volumes(struct ubi_device
*ubi
)
461 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
463 ubi_free_volume(ubi
, ubi
->volumes
[i
]);
467 * uif_init - initialize user interfaces for an UBI device.
468 * @ubi: UBI device description object
469 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
470 * taken, otherwise set to %0
472 * This function initializes various user interfaces for an UBI device. If the
473 * initialization fails at an early stage, this function frees all the
474 * resources it allocated, returns an error, and @ref is set to %0. However,
475 * if the initialization fails after the UBI device was registered in the
476 * driver core subsystem, this function takes a reference to @ubi->dev, because
477 * otherwise the release function ('dev_release()') would free whole @ubi
478 * object. The @ref argument is set to %1 in this case. The caller has to put
481 * This function returns zero in case of success and a negative error code in
484 static int uif_init(struct ubi_device
*ubi
, int *ref
)
490 sprintf(ubi
->ubi_name
, UBI_NAME_STR
"%d", ubi
->ubi_num
);
493 * Major numbers for the UBI character devices are allocated
494 * dynamically. Major numbers of volume character devices are
495 * equivalent to ones of the corresponding UBI character device. Minor
496 * numbers of UBI character devices are 0, while minor numbers of
497 * volume character devices start from 1. Thus, we allocate one major
498 * number and ubi->vtbl_slots + 1 minor numbers.
500 err
= alloc_chrdev_region(&dev
, 0, ubi
->vtbl_slots
+ 1, ubi
->ubi_name
);
502 ubi_err("cannot register UBI character devices");
506 ubi_assert(MINOR(dev
) == 0);
507 cdev_init(&ubi
->cdev
, &ubi_cdev_operations
);
508 dbg_gen("%s major is %u", ubi
->ubi_name
, MAJOR(dev
));
509 ubi
->cdev
.owner
= THIS_MODULE
;
511 err
= cdev_add(&ubi
->cdev
, dev
, 1);
513 ubi_err("cannot add character device");
517 err
= ubi_sysfs_init(ubi
, ref
);
521 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
522 if (ubi
->volumes
[i
]) {
523 err
= ubi_add_volume(ubi
, ubi
->volumes
[i
]);
525 ubi_err("cannot add volume %d", i
);
536 get_device(&ubi
->dev
);
537 ubi_sysfs_close(ubi
);
538 cdev_del(&ubi
->cdev
);
540 unregister_chrdev_region(ubi
->cdev
.dev
, ubi
->vtbl_slots
+ 1);
541 ubi_err("cannot initialize UBI %s, error %d", ubi
->ubi_name
, err
);
546 * uif_close - close user interfaces for an UBI device.
547 * @ubi: UBI device description object
549 * Note, since this function un-registers UBI volume device objects (@vol->dev),
550 * the memory allocated voe the volumes is freed as well (in the release
553 static void uif_close(struct ubi_device
*ubi
)
556 ubi_sysfs_close(ubi
);
557 cdev_del(&ubi
->cdev
);
558 unregister_chrdev_region(ubi
->cdev
.dev
, ubi
->vtbl_slots
+ 1);
562 * ubi_free_internal_volumes - free internal volumes.
563 * @ubi: UBI device description object
565 void ubi_free_internal_volumes(struct ubi_device
*ubi
)
569 for (i
= ubi
->vtbl_slots
;
570 i
< ubi
->vtbl_slots
+ UBI_INT_VOL_COUNT
; i
++) {
571 kfree(ubi
->volumes
[i
]->eba_tbl
);
572 kfree(ubi
->volumes
[i
]);
576 static int get_bad_peb_limit(const struct ubi_device
*ubi
, int max_beb_per1024
)
578 int limit
, device_pebs
;
579 uint64_t device_size
;
581 if (!max_beb_per1024
)
585 * Here we are using size of the entire flash chip and
586 * not just the MTD partition size because the maximum
587 * number of bad eraseblocks is a percentage of the
588 * whole device and bad eraseblocks are not fairly
589 * distributed over the flash chip. So the worst case
590 * is that all the bad eraseblocks of the chip are in
591 * the MTD partition we are attaching (ubi->mtd).
593 device_size
= mtd_get_device_size(ubi
->mtd
);
594 device_pebs
= mtd_div_by_eb(device_size
, ubi
->mtd
);
595 limit
= mult_frac(device_pebs
, max_beb_per1024
, 1024);
598 if (mult_frac(limit
, 1024, max_beb_per1024
) < device_pebs
)
605 * io_init - initialize I/O sub-system for a given UBI device.
606 * @ubi: UBI device description object
607 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
609 * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
611 * o EC header is always at offset zero - this cannot be changed;
612 * o VID header starts just after the EC header at the closest address
613 * aligned to @io->hdrs_min_io_size;
614 * o data starts just after the VID header at the closest address aligned to
617 * This function returns zero in case of success and a negative error code in
620 static int io_init(struct ubi_device
*ubi
, int max_beb_per1024
)
622 if (ubi
->mtd
->numeraseregions
!= 0) {
624 * Some flashes have several erase regions. Different regions
625 * may have different eraseblock size and other
626 * characteristics. It looks like mostly multi-region flashes
627 * have one "main" region and one or more small regions to
628 * store boot loader code or boot parameters or whatever. I
629 * guess we should just pick the largest region. But this is
632 ubi_err("multiple regions, not implemented");
636 if (ubi
->vid_hdr_offset
< 0)
640 * Note, in this implementation we support MTD devices with 0x7FFFFFFF
641 * physical eraseblocks maximum.
644 ubi
->peb_size
= ubi
->mtd
->erasesize
;
645 ubi
->peb_count
= mtd_div_by_eb(ubi
->mtd
->size
, ubi
->mtd
);
646 ubi
->flash_size
= ubi
->mtd
->size
;
648 if (mtd_can_have_bb(ubi
->mtd
)) {
649 ubi
->bad_allowed
= 1;
650 ubi
->bad_peb_limit
= get_bad_peb_limit(ubi
, max_beb_per1024
);
653 if (ubi
->mtd
->type
== MTD_NORFLASH
) {
654 ubi_assert(ubi
->mtd
->writesize
== 1);
658 ubi
->min_io_size
= ubi
->mtd
->writesize
;
659 ubi
->hdrs_min_io_size
= ubi
->mtd
->writesize
>> ubi
->mtd
->subpage_sft
;
662 * Make sure minimal I/O unit is power of 2. Note, there is no
663 * fundamental reason for this assumption. It is just an optimization
664 * which allows us to avoid costly division operations.
666 if (!is_power_of_2(ubi
->min_io_size
)) {
667 ubi_err("min. I/O unit (%d) is not power of 2",
672 ubi_assert(ubi
->hdrs_min_io_size
> 0);
673 ubi_assert(ubi
->hdrs_min_io_size
<= ubi
->min_io_size
);
674 ubi_assert(ubi
->min_io_size
% ubi
->hdrs_min_io_size
== 0);
676 ubi
->max_write_size
= ubi
->mtd
->writebufsize
;
678 * Maximum write size has to be greater or equivalent to min. I/O
679 * size, and be multiple of min. I/O size.
681 if (ubi
->max_write_size
< ubi
->min_io_size
||
682 ubi
->max_write_size
% ubi
->min_io_size
||
683 !is_power_of_2(ubi
->max_write_size
)) {
684 ubi_err("bad write buffer size %d for %d min. I/O unit",
685 ubi
->max_write_size
, ubi
->min_io_size
);
689 /* Calculate default aligned sizes of EC and VID headers */
690 ubi
->ec_hdr_alsize
= ALIGN(UBI_EC_HDR_SIZE
, ubi
->hdrs_min_io_size
);
691 ubi
->vid_hdr_alsize
= ALIGN(UBI_VID_HDR_SIZE
, ubi
->hdrs_min_io_size
);
693 dbg_msg("min_io_size %d", ubi
->min_io_size
);
694 dbg_msg("max_write_size %d", ubi
->max_write_size
);
695 dbg_msg("hdrs_min_io_size %d", ubi
->hdrs_min_io_size
);
696 dbg_msg("ec_hdr_alsize %d", ubi
->ec_hdr_alsize
);
697 dbg_msg("vid_hdr_alsize %d", ubi
->vid_hdr_alsize
);
699 if (ubi
->vid_hdr_offset
== 0)
701 ubi
->vid_hdr_offset
= ubi
->vid_hdr_aloffset
=
704 ubi
->vid_hdr_aloffset
= ubi
->vid_hdr_offset
&
705 ~(ubi
->hdrs_min_io_size
- 1);
706 ubi
->vid_hdr_shift
= ubi
->vid_hdr_offset
-
707 ubi
->vid_hdr_aloffset
;
710 /* Similar for the data offset */
711 ubi
->leb_start
= ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
;
712 ubi
->leb_start
= ALIGN(ubi
->leb_start
, ubi
->min_io_size
);
714 dbg_msg("vid_hdr_offset %d", ubi
->vid_hdr_offset
);
715 dbg_msg("vid_hdr_aloffset %d", ubi
->vid_hdr_aloffset
);
716 dbg_msg("vid_hdr_shift %d", ubi
->vid_hdr_shift
);
717 dbg_msg("leb_start %d", ubi
->leb_start
);
719 /* The shift must be aligned to 32-bit boundary */
720 if (ubi
->vid_hdr_shift
% 4) {
721 ubi_err("unaligned VID header shift %d",
727 if (ubi
->vid_hdr_offset
< UBI_EC_HDR_SIZE
||
728 ubi
->leb_start
< ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
||
729 ubi
->leb_start
> ubi
->peb_size
- UBI_VID_HDR_SIZE
||
730 ubi
->leb_start
& (ubi
->min_io_size
- 1)) {
731 ubi_err("bad VID header (%d) or data offsets (%d)",
732 ubi
->vid_hdr_offset
, ubi
->leb_start
);
737 * Set maximum amount of physical erroneous eraseblocks to be 10%.
738 * Erroneous PEB are those which have read errors.
740 ubi
->max_erroneous
= ubi
->peb_count
/ 10;
741 if (ubi
->max_erroneous
< 16)
742 ubi
->max_erroneous
= 16;
743 dbg_msg("max_erroneous %d", ubi
->max_erroneous
);
746 * It may happen that EC and VID headers are situated in one minimal
747 * I/O unit. In this case we can only accept this UBI image in
750 if (ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
<= ubi
->hdrs_min_io_size
) {
751 ubi_warn("EC and VID headers are in the same minimal I/O unit, switch to read-only mode");
755 ubi
->leb_size
= ubi
->peb_size
- ubi
->leb_start
;
757 if (!(ubi
->mtd
->flags
& MTD_WRITEABLE
)) {
758 ubi_msg("MTD device %d is write-protected, attach in read-only mode",
763 ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
764 ubi
->peb_size
, ubi
->peb_size
>> 10);
765 ubi_msg("logical eraseblock size: %d bytes", ubi
->leb_size
);
766 ubi_msg("smallest flash I/O unit: %d", ubi
->min_io_size
);
767 if (ubi
->hdrs_min_io_size
!= ubi
->min_io_size
)
768 ubi_msg("sub-page size: %d",
769 ubi
->hdrs_min_io_size
);
770 ubi_msg("VID header offset: %d (aligned %d)",
771 ubi
->vid_hdr_offset
, ubi
->vid_hdr_aloffset
);
772 ubi_msg("data offset: %d", ubi
->leb_start
);
775 * Note, ideally, we have to initialize @ubi->bad_peb_count here. But
776 * unfortunately, MTD does not provide this information. We should loop
777 * over all physical eraseblocks and invoke mtd->block_is_bad() for
778 * each physical eraseblock. So, we leave @ubi->bad_peb_count
779 * uninitialized so far.
786 * autoresize - re-size the volume which has the "auto-resize" flag set.
787 * @ubi: UBI device description object
788 * @vol_id: ID of the volume to re-size
790 * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in
791 * the volume table to the largest possible size. See comments in ubi-header.h
792 * for more description of the flag. Returns zero in case of success and a
793 * negative error code in case of failure.
795 static int autoresize(struct ubi_device
*ubi
, int vol_id
)
797 struct ubi_volume_desc desc
;
798 struct ubi_volume
*vol
= ubi
->volumes
[vol_id
];
799 int err
, old_reserved_pebs
= vol
->reserved_pebs
;
802 ubi_warn("skip auto-resize because of R/O mode");
807 * Clear the auto-resize flag in the volume in-memory copy of the
808 * volume table, and 'ubi_resize_volume()' will propagate this change
811 ubi
->vtbl
[vol_id
].flags
&= ~UBI_VTBL_AUTORESIZE_FLG
;
813 if (ubi
->avail_pebs
== 0) {
814 struct ubi_vtbl_record vtbl_rec
;
817 * No available PEBs to re-size the volume, clear the flag on
820 memcpy(&vtbl_rec
, &ubi
->vtbl
[vol_id
],
821 sizeof(struct ubi_vtbl_record
));
822 err
= ubi_change_vtbl_record(ubi
, vol_id
, &vtbl_rec
);
824 ubi_err("cannot clean auto-resize flag for volume %d",
828 err
= ubi_resize_volume(&desc
,
829 old_reserved_pebs
+ ubi
->avail_pebs
);
831 ubi_err("cannot auto-resize volume %d", vol_id
);
837 ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id
,
838 vol
->name
, old_reserved_pebs
, vol
->reserved_pebs
);
843 * ubi_attach_mtd_dev - attach an MTD device.
844 * @mtd: MTD device description object
845 * @ubi_num: number to assign to the new UBI device
846 * @vid_hdr_offset: VID header offset
847 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
849 * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
850 * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
851 * which case this function finds a vacant device number and assigns it
852 * automatically. Returns the new UBI device number in case of success and a
853 * negative error code in case of failure.
855 * Note, the invocations of this function has to be serialized by the
856 * @ubi_devices_mutex.
858 int ubi_attach_mtd_dev(struct mtd_info
*mtd
, int ubi_num
,
859 int vid_hdr_offset
, int max_beb_per1024
)
861 struct ubi_device
*ubi
;
864 if (max_beb_per1024
< 0 || max_beb_per1024
> MAX_MTD_UBI_BEB_LIMIT
)
867 if (!max_beb_per1024
)
868 max_beb_per1024
= CONFIG_MTD_UBI_BEB_LIMIT
;
871 * Check if we already have the same MTD device attached.
873 * Note, this function assumes that UBI devices creations and deletions
874 * are serialized, so it does not take the &ubi_devices_lock.
876 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
877 ubi
= ubi_devices
[i
];
878 if (ubi
&& mtd
->index
== ubi
->mtd
->index
) {
879 ubi_err("mtd%d is already attached to ubi%d",
886 * Make sure this MTD device is not emulated on top of an UBI volume
887 * already. Well, generally this recursion works fine, but there are
888 * different problems like the UBI module takes a reference to itself
889 * by attaching (and thus, opening) the emulated MTD device. This
890 * results in inability to unload the module. And in general it makes
891 * no sense to attach emulated MTD devices, so we prohibit this.
893 if (mtd
->type
== MTD_UBIVOLUME
) {
894 ubi_err("refuse attaching mtd%d - it is already emulated on top of UBI",
899 if (ubi_num
== UBI_DEV_NUM_AUTO
) {
900 /* Search for an empty slot in the @ubi_devices array */
901 for (ubi_num
= 0; ubi_num
< UBI_MAX_DEVICES
; ubi_num
++)
902 if (!ubi_devices
[ubi_num
])
904 if (ubi_num
== UBI_MAX_DEVICES
) {
905 ubi_err("only %d UBI devices may be created",
910 if (ubi_num
>= UBI_MAX_DEVICES
)
913 /* Make sure ubi_num is not busy */
914 if (ubi_devices
[ubi_num
]) {
915 ubi_err("ubi%d already exists", ubi_num
);
920 ubi
= kzalloc(sizeof(struct ubi_device
), GFP_KERNEL
);
925 ubi
->ubi_num
= ubi_num
;
926 ubi
->vid_hdr_offset
= vid_hdr_offset
;
927 ubi
->autoresize_vol_id
= -1;
929 mutex_init(&ubi
->buf_mutex
);
930 mutex_init(&ubi
->ckvol_mutex
);
931 mutex_init(&ubi
->device_mutex
);
932 spin_lock_init(&ubi
->volumes_lock
);
934 ubi_msg("attaching mtd%d to ubi%d", mtd
->index
, ubi_num
);
935 dbg_msg("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb
));
936 dbg_msg("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry
));
938 err
= io_init(ubi
, max_beb_per1024
);
943 ubi
->peb_buf
= vmalloc(ubi
->peb_size
);
947 err
= ubi_debugging_init_dev(ubi
);
951 err
= ubi_attach(ubi
);
953 ubi_err("failed to attach mtd%d, error %d", mtd
->index
, err
);
957 if (ubi
->autoresize_vol_id
!= -1) {
958 err
= autoresize(ubi
, ubi
->autoresize_vol_id
);
963 err
= uif_init(ubi
, &ref
);
967 err
= ubi_debugfs_init_dev(ubi
);
971 ubi
->bgt_thread
= kthread_create(ubi_thread
, ubi
, ubi
->bgt_name
);
972 if (IS_ERR(ubi
->bgt_thread
)) {
973 err
= PTR_ERR(ubi
->bgt_thread
);
974 ubi_err("cannot spawn \"%s\", error %d", ubi
->bgt_name
,
979 ubi_msg("attached mtd%d to ubi%d", mtd
->index
, ubi_num
);
980 ubi_msg("MTD device name: \"%s\"", mtd
->name
);
981 ubi_msg("MTD device size: %llu MiB", ubi
->flash_size
>> 20);
982 ubi_msg("number of good PEBs: %d", ubi
->good_peb_count
);
983 ubi_msg("number of bad PEBs: %d", ubi
->bad_peb_count
);
984 ubi_msg("number of corrupted PEBs: %d", ubi
->corr_peb_count
);
985 ubi_msg("max. allowed volumes: %d", ubi
->vtbl_slots
);
986 ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD
);
987 ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT
);
988 ubi_msg("number of user volumes: %d",
989 ubi
->vol_count
- UBI_INT_VOL_COUNT
);
990 ubi_msg("available PEBs: %d", ubi
->avail_pebs
);
991 ubi_msg("total number of reserved PEBs: %d", ubi
->rsvd_pebs
);
992 ubi_msg("number of PEBs reserved for bad PEB handling: %d",
994 ubi_msg("max/mean erase counter: %d/%d", ubi
->max_ec
, ubi
->mean_ec
);
995 ubi_msg("image sequence number: %u", ubi
->image_seq
);
998 * The below lock makes sure we do not race with 'ubi_thread()' which
999 * checks @ubi->thread_enabled. Otherwise we may fail to wake it up.
1001 spin_lock(&ubi
->wl_lock
);
1002 ubi
->thread_enabled
= 1;
1003 wake_up_process(ubi
->bgt_thread
);
1004 spin_unlock(&ubi
->wl_lock
);
1006 ubi_devices
[ubi_num
] = ubi
;
1007 ubi_notify_all(ubi
, UBI_VOLUME_ADDED
, NULL
);
1011 ubi_debugfs_exit_dev(ubi
);
1013 get_device(&ubi
->dev
);
1018 ubi_free_internal_volumes(ubi
);
1021 ubi_debugging_exit_dev(ubi
);
1023 vfree(ubi
->peb_buf
);
1025 put_device(&ubi
->dev
);
1032 * ubi_detach_mtd_dev - detach an MTD device.
1033 * @ubi_num: UBI device number to detach from
1034 * @anyway: detach MTD even if device reference count is not zero
1036 * This function destroys an UBI device number @ubi_num and detaches the
1037 * underlying MTD device. Returns zero in case of success and %-EBUSY if the
1038 * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not
1041 * Note, the invocations of this function has to be serialized by the
1042 * @ubi_devices_mutex.
1044 int ubi_detach_mtd_dev(int ubi_num
, int anyway
)
1046 struct ubi_device
*ubi
;
1048 if (ubi_num
< 0 || ubi_num
>= UBI_MAX_DEVICES
)
1051 ubi
= ubi_get_device(ubi_num
);
1055 spin_lock(&ubi_devices_lock
);
1056 put_device(&ubi
->dev
);
1057 ubi
->ref_count
-= 1;
1058 if (ubi
->ref_count
) {
1060 spin_unlock(&ubi_devices_lock
);
1063 /* This may only happen if there is a bug */
1064 ubi_err("%s reference count %d, destroy anyway",
1065 ubi
->ubi_name
, ubi
->ref_count
);
1067 ubi_devices
[ubi_num
] = NULL
;
1068 spin_unlock(&ubi_devices_lock
);
1070 ubi_assert(ubi_num
== ubi
->ubi_num
);
1071 ubi_notify_all(ubi
, UBI_VOLUME_REMOVED
, NULL
);
1072 dbg_msg("detaching mtd%d from ubi%d", ubi
->mtd
->index
, ubi_num
);
1075 * Before freeing anything, we have to stop the background thread to
1076 * prevent it from doing anything on this device while we are freeing.
1078 if (ubi
->bgt_thread
)
1079 kthread_stop(ubi
->bgt_thread
);
1082 * Get a reference to the device in order to prevent 'dev_release()'
1083 * from freeing the @ubi object.
1085 get_device(&ubi
->dev
);
1087 ubi_debugfs_exit_dev(ubi
);
1090 ubi_free_internal_volumes(ubi
);
1092 put_mtd_device(ubi
->mtd
);
1093 ubi_debugging_exit_dev(ubi
);
1094 vfree(ubi
->peb_buf
);
1095 ubi_msg("mtd%d is detached from ubi%d", ubi
->mtd
->index
, ubi
->ubi_num
);
1096 put_device(&ubi
->dev
);
1101 * open_mtd_by_chdev - open an MTD device by its character device node path.
1102 * @mtd_dev: MTD character device node path
1104 * This helper function opens an MTD device by its character node device path.
1105 * Returns MTD device description object in case of success and a negative
1106 * error code in case of failure.
1108 static struct mtd_info
* __init
open_mtd_by_chdev(const char *mtd_dev
)
1110 int err
, major
, minor
, mode
;
1113 /* Probably this is an MTD character device node path */
1114 err
= kern_path(mtd_dev
, LOOKUP_FOLLOW
, &path
);
1116 return ERR_PTR(err
);
1118 /* MTD device number is defined by the major / minor numbers */
1119 major
= imajor(path
.dentry
->d_inode
);
1120 minor
= iminor(path
.dentry
->d_inode
);
1121 mode
= path
.dentry
->d_inode
->i_mode
;
1123 if (major
!= MTD_CHAR_MAJOR
|| !S_ISCHR(mode
))
1124 return ERR_PTR(-EINVAL
);
1128 * Just do not think the "/dev/mtdrX" devices support is need,
1129 * so do not support them to avoid doing extra work.
1131 return ERR_PTR(-EINVAL
);
1133 return get_mtd_device(NULL
, minor
/ 2);
1137 * open_mtd_device - open MTD device by name, character device path, or number.
1138 * @mtd_dev: name, character device node path, or MTD device device number
1140 * This function tries to open and MTD device described by @mtd_dev string,
1141 * which is first treated as ASCII MTD device number, and if it is not true, it
1142 * is treated as MTD device name, and if that is also not true, it is treated
1143 * as MTD character device node path. Returns MTD device description object in
1144 * case of success and a negative error code in case of failure.
1146 static struct mtd_info
* __init
open_mtd_device(const char *mtd_dev
)
1148 struct mtd_info
*mtd
;
1152 mtd_num
= simple_strtoul(mtd_dev
, &endp
, 0);
1153 if (*endp
!= '\0' || mtd_dev
== endp
) {
1155 * This does not look like an ASCII integer, probably this is
1158 mtd
= get_mtd_device_nm(mtd_dev
);
1159 if (IS_ERR(mtd
) && PTR_ERR(mtd
) == -ENODEV
)
1160 /* Probably this is an MTD character device node path */
1161 mtd
= open_mtd_by_chdev(mtd_dev
);
1163 mtd
= get_mtd_device(NULL
, mtd_num
);
1168 static int __init
ubi_init(void)
1172 /* Ensure that EC and VID headers have correct size */
1173 BUILD_BUG_ON(sizeof(struct ubi_ec_hdr
) != 64);
1174 BUILD_BUG_ON(sizeof(struct ubi_vid_hdr
) != 64);
1176 if (mtd_devs
> UBI_MAX_DEVICES
) {
1177 ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES
);
1181 /* Create base sysfs directory and sysfs files */
1182 ubi_class
= class_create(THIS_MODULE
, UBI_NAME_STR
);
1183 if (IS_ERR(ubi_class
)) {
1184 err
= PTR_ERR(ubi_class
);
1185 ubi_err("cannot create UBI class");
1189 err
= class_create_file(ubi_class
, &ubi_version
);
1191 ubi_err("cannot create sysfs file");
1195 err
= misc_register(&ubi_ctrl_cdev
);
1197 ubi_err("cannot register device");
1201 ubi_wl_entry_slab
= kmem_cache_create("ubi_wl_entry_slab",
1202 sizeof(struct ubi_wl_entry
),
1204 if (!ubi_wl_entry_slab
)
1207 err
= ubi_debugfs_init();
1212 /* Attach MTD devices */
1213 for (i
= 0; i
< mtd_devs
; i
++) {
1214 struct mtd_dev_param
*p
= &mtd_dev_param
[i
];
1215 struct mtd_info
*mtd
;
1219 mtd
= open_mtd_device(p
->name
);
1225 mutex_lock(&ubi_devices_mutex
);
1226 err
= ubi_attach_mtd_dev(mtd
, UBI_DEV_NUM_AUTO
,
1227 p
->vid_hdr_offs
, p
->max_beb_per1024
);
1228 mutex_unlock(&ubi_devices_mutex
);
1230 ubi_err("cannot attach mtd%d", mtd
->index
);
1231 put_mtd_device(mtd
);
1234 * Originally UBI stopped initializing on any error.
1235 * However, later on it was found out that this
1236 * behavior is not very good when UBI is compiled into
1237 * the kernel and the MTD devices to attach are passed
1238 * through the command line. Indeed, UBI failure
1239 * stopped whole boot sequence.
1241 * To fix this, we changed the behavior for the
1242 * non-module case, but preserved the old behavior for
1243 * the module case, just for compatibility. This is a
1244 * little inconsistent, though.
1246 if (ubi_is_module())
1254 for (k
= 0; k
< i
; k
++)
1255 if (ubi_devices
[k
]) {
1256 mutex_lock(&ubi_devices_mutex
);
1257 ubi_detach_mtd_dev(ubi_devices
[k
]->ubi_num
, 1);
1258 mutex_unlock(&ubi_devices_mutex
);
1262 kmem_cache_destroy(ubi_wl_entry_slab
);
1264 misc_deregister(&ubi_ctrl_cdev
);
1266 class_remove_file(ubi_class
, &ubi_version
);
1268 class_destroy(ubi_class
);
1270 ubi_err("UBI error: cannot initialize UBI, error %d", err
);
1273 module_init(ubi_init
);
1275 static void __exit
ubi_exit(void)
1279 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++)
1280 if (ubi_devices
[i
]) {
1281 mutex_lock(&ubi_devices_mutex
);
1282 ubi_detach_mtd_dev(ubi_devices
[i
]->ubi_num
, 1);
1283 mutex_unlock(&ubi_devices_mutex
);
1286 kmem_cache_destroy(ubi_wl_entry_slab
);
1287 misc_deregister(&ubi_ctrl_cdev
);
1288 class_remove_file(ubi_class
, &ubi_version
);
1289 class_destroy(ubi_class
);
1291 module_exit(ubi_exit
);
1294 * bytes_str_to_int - convert a number of bytes string into an integer.
1295 * @str: the string to convert
1297 * This function returns positive resulting integer in case of success and a
1298 * negative error code in case of failure.
1300 static int __init
bytes_str_to_int(const char *str
)
1303 unsigned long result
;
1305 result
= simple_strtoul(str
, &endp
, 0);
1306 if (str
== endp
|| result
>= INT_MAX
) {
1307 printk(KERN_ERR
"UBI error: incorrect bytes count: \"%s\"\n",
1319 if (endp
[1] == 'i' && endp
[2] == 'B')
1324 printk(KERN_ERR
"UBI error: incorrect bytes count: \"%s\"\n",
1333 * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter.
1334 * @val: the parameter value to parse
1337 * This function returns zero in case of success and a negative error code in
1340 static int __init
ubi_mtd_param_parse(const char *val
, struct kernel_param
*kp
)
1343 struct mtd_dev_param
*p
;
1344 char buf
[MTD_PARAM_LEN_MAX
];
1345 char *pbuf
= &buf
[0];
1346 char *tokens
[MTD_PARAM_MAX_COUNT
];
1351 if (mtd_devs
== UBI_MAX_DEVICES
) {
1352 printk(KERN_ERR
"UBI error: too many parameters, max. is %d\n",
1357 len
= strnlen(val
, MTD_PARAM_LEN_MAX
);
1358 if (len
== MTD_PARAM_LEN_MAX
) {
1359 printk(KERN_ERR
"UBI error: parameter \"%s\" is too long, max. is %d\n",
1360 val
, MTD_PARAM_LEN_MAX
);
1365 printk(KERN_WARNING
"UBI warning: empty 'mtd=' parameter - ignored\n");
1371 /* Get rid of the final newline */
1372 if (buf
[len
- 1] == '\n')
1373 buf
[len
- 1] = '\0';
1375 for (i
= 0; i
< MTD_PARAM_MAX_COUNT
; i
++)
1376 tokens
[i
] = strsep(&pbuf
, ",");
1379 printk(KERN_ERR
"UBI error: too many arguments at \"%s\"\n",
1384 p
= &mtd_dev_param
[mtd_devs
];
1385 strcpy(&p
->name
[0], tokens
[0]);
1388 p
->vid_hdr_offs
= bytes_str_to_int(tokens
[1]);
1390 if (p
->vid_hdr_offs
< 0)
1391 return p
->vid_hdr_offs
;
1394 int err
= kstrtoint(tokens
[2], 10, &p
->max_beb_per1024
);
1397 printk(KERN_ERR
"UBI error: bad value for max_beb_per1024 parameter: %s",
1407 module_param_call(mtd
, ubi_mtd_param_parse
, NULL
, NULL
, 000);
1408 MODULE_PARM_DESC(mtd
, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]].\n"
1409 "Multiple \"mtd\" parameters may be specified.\n"
1410 "MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
1411 "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
1412 "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
1413 __stringify(CONFIG_MTD_UBI_BEB_LIMIT
) ") if 0)\n"
1415 "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
1416 "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"
1417 "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"
1418 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
1420 MODULE_VERSION(__stringify(UBI_VERSION
));
1421 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
1422 MODULE_AUTHOR("Artem Bityutskiy");
1423 MODULE_LICENSE("GPL");