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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (c) International Business Machines Corp., 2006
0004  *
0005  * Author: Artem Bityutskiy (Битюцкий Артём)
0006  */
0007 
0008 #include "ubi.h"
0009 #include <linux/debugfs.h>
0010 #include <linux/uaccess.h>
0011 #include <linux/module.h>
0012 #include <linux/seq_file.h>
0013 
0014 
0015 /**
0016  * ubi_dump_flash - dump a region of flash.
0017  * @ubi: UBI device description object
0018  * @pnum: the physical eraseblock number to dump
0019  * @offset: the starting offset within the physical eraseblock to dump
0020  * @len: the length of the region to dump
0021  */
0022 void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
0023 {
0024     int err;
0025     size_t read;
0026     void *buf;
0027     loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
0028 
0029     buf = vmalloc(len);
0030     if (!buf)
0031         return;
0032     err = mtd_read(ubi->mtd, addr, len, &read, buf);
0033     if (err && err != -EUCLEAN) {
0034         ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes",
0035             err, len, pnum, offset, read);
0036         goto out;
0037     }
0038 
0039     ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d",
0040         len, pnum, offset);
0041     print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
0042 out:
0043     vfree(buf);
0044     return;
0045 }
0046 
0047 /**
0048  * ubi_dump_ec_hdr - dump an erase counter header.
0049  * @ec_hdr: the erase counter header to dump
0050  */
0051 void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
0052 {
0053     pr_err("Erase counter header dump:\n");
0054     pr_err("\tmagic          %#08x\n", be32_to_cpu(ec_hdr->magic));
0055     pr_err("\tversion        %d\n", (int)ec_hdr->version);
0056     pr_err("\tec             %llu\n", (long long)be64_to_cpu(ec_hdr->ec));
0057     pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset));
0058     pr_err("\tdata_offset    %d\n", be32_to_cpu(ec_hdr->data_offset));
0059     pr_err("\timage_seq      %d\n", be32_to_cpu(ec_hdr->image_seq));
0060     pr_err("\thdr_crc        %#08x\n", be32_to_cpu(ec_hdr->hdr_crc));
0061     pr_err("erase counter header hexdump:\n");
0062     print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
0063                ec_hdr, UBI_EC_HDR_SIZE, 1);
0064 }
0065 
0066 /**
0067  * ubi_dump_vid_hdr - dump a volume identifier header.
0068  * @vid_hdr: the volume identifier header to dump
0069  */
0070 void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
0071 {
0072     pr_err("Volume identifier header dump:\n");
0073     pr_err("\tmagic     %08x\n", be32_to_cpu(vid_hdr->magic));
0074     pr_err("\tversion   %d\n",  (int)vid_hdr->version);
0075     pr_err("\tvol_type  %d\n",  (int)vid_hdr->vol_type);
0076     pr_err("\tcopy_flag %d\n",  (int)vid_hdr->copy_flag);
0077     pr_err("\tcompat    %d\n",  (int)vid_hdr->compat);
0078     pr_err("\tvol_id    %d\n",  be32_to_cpu(vid_hdr->vol_id));
0079     pr_err("\tlnum      %d\n",  be32_to_cpu(vid_hdr->lnum));
0080     pr_err("\tdata_size %d\n",  be32_to_cpu(vid_hdr->data_size));
0081     pr_err("\tused_ebs  %d\n",  be32_to_cpu(vid_hdr->used_ebs));
0082     pr_err("\tdata_pad  %d\n",  be32_to_cpu(vid_hdr->data_pad));
0083     pr_err("\tsqnum     %llu\n",
0084         (unsigned long long)be64_to_cpu(vid_hdr->sqnum));
0085     pr_err("\thdr_crc   %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
0086     pr_err("Volume identifier header hexdump:\n");
0087     print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
0088                vid_hdr, UBI_VID_HDR_SIZE, 1);
0089 }
0090 
0091 /**
0092  * ubi_dump_vol_info - dump volume information.
0093  * @vol: UBI volume description object
0094  */
0095 void ubi_dump_vol_info(const struct ubi_volume *vol)
0096 {
0097     pr_err("Volume information dump:\n");
0098     pr_err("\tvol_id          %d\n", vol->vol_id);
0099     pr_err("\treserved_pebs   %d\n", vol->reserved_pebs);
0100     pr_err("\talignment       %d\n", vol->alignment);
0101     pr_err("\tdata_pad        %d\n", vol->data_pad);
0102     pr_err("\tvol_type        %d\n", vol->vol_type);
0103     pr_err("\tname_len        %d\n", vol->name_len);
0104     pr_err("\tusable_leb_size %d\n", vol->usable_leb_size);
0105     pr_err("\tused_ebs        %d\n", vol->used_ebs);
0106     pr_err("\tused_bytes      %lld\n", vol->used_bytes);
0107     pr_err("\tlast_eb_bytes   %d\n", vol->last_eb_bytes);
0108     pr_err("\tcorrupted       %d\n", vol->corrupted);
0109     pr_err("\tupd_marker      %d\n", vol->upd_marker);
0110     pr_err("\tskip_check      %d\n", vol->skip_check);
0111 
0112     if (vol->name_len <= UBI_VOL_NAME_MAX &&
0113         strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
0114         pr_err("\tname            %s\n", vol->name);
0115     } else {
0116         pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
0117                vol->name[0], vol->name[1], vol->name[2],
0118                vol->name[3], vol->name[4]);
0119     }
0120 }
0121 
0122 /**
0123  * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
0124  * @r: the object to dump
0125  * @idx: volume table index
0126  */
0127 void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
0128 {
0129     int name_len = be16_to_cpu(r->name_len);
0130 
0131     pr_err("Volume table record %d dump:\n", idx);
0132     pr_err("\treserved_pebs   %d\n", be32_to_cpu(r->reserved_pebs));
0133     pr_err("\talignment       %d\n", be32_to_cpu(r->alignment));
0134     pr_err("\tdata_pad        %d\n", be32_to_cpu(r->data_pad));
0135     pr_err("\tvol_type        %d\n", (int)r->vol_type);
0136     pr_err("\tupd_marker      %d\n", (int)r->upd_marker);
0137     pr_err("\tname_len        %d\n", name_len);
0138 
0139     if (r->name[0] == '\0') {
0140         pr_err("\tname            NULL\n");
0141         return;
0142     }
0143 
0144     if (name_len <= UBI_VOL_NAME_MAX &&
0145         strnlen(&r->name[0], name_len + 1) == name_len) {
0146         pr_err("\tname            %s\n", &r->name[0]);
0147     } else {
0148         pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
0149             r->name[0], r->name[1], r->name[2], r->name[3],
0150             r->name[4]);
0151     }
0152     pr_err("\tcrc             %#08x\n", be32_to_cpu(r->crc));
0153 }
0154 
0155 /**
0156  * ubi_dump_av - dump a &struct ubi_ainf_volume object.
0157  * @av: the object to dump
0158  */
0159 void ubi_dump_av(const struct ubi_ainf_volume *av)
0160 {
0161     pr_err("Volume attaching information dump:\n");
0162     pr_err("\tvol_id         %d\n", av->vol_id);
0163     pr_err("\thighest_lnum   %d\n", av->highest_lnum);
0164     pr_err("\tleb_count      %d\n", av->leb_count);
0165     pr_err("\tcompat         %d\n", av->compat);
0166     pr_err("\tvol_type       %d\n", av->vol_type);
0167     pr_err("\tused_ebs       %d\n", av->used_ebs);
0168     pr_err("\tlast_data_size %d\n", av->last_data_size);
0169     pr_err("\tdata_pad       %d\n", av->data_pad);
0170 }
0171 
0172 /**
0173  * ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
0174  * @aeb: the object to dump
0175  * @type: object type: 0 - not corrupted, 1 - corrupted
0176  */
0177 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
0178 {
0179     pr_err("eraseblock attaching information dump:\n");
0180     pr_err("\tec       %d\n", aeb->ec);
0181     pr_err("\tpnum     %d\n", aeb->pnum);
0182     if (type == 0) {
0183         pr_err("\tlnum     %d\n", aeb->lnum);
0184         pr_err("\tscrub    %d\n", aeb->scrub);
0185         pr_err("\tsqnum    %llu\n", aeb->sqnum);
0186     }
0187 }
0188 
0189 /**
0190  * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
0191  * @req: the object to dump
0192  */
0193 void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
0194 {
0195     char nm[17];
0196 
0197     pr_err("Volume creation request dump:\n");
0198     pr_err("\tvol_id    %d\n",   req->vol_id);
0199     pr_err("\talignment %d\n",   req->alignment);
0200     pr_err("\tbytes     %lld\n", (long long)req->bytes);
0201     pr_err("\tvol_type  %d\n",   req->vol_type);
0202     pr_err("\tname_len  %d\n",   req->name_len);
0203 
0204     memcpy(nm, req->name, 16);
0205     nm[16] = 0;
0206     pr_err("\t1st 16 characters of name: %s\n", nm);
0207 }
0208 
0209 /*
0210  * Root directory for UBI stuff in debugfs. Contains sub-directories which
0211  * contain the stuff specific to particular UBI devices.
0212  */
0213 static struct dentry *dfs_rootdir;
0214 
0215 /**
0216  * ubi_debugfs_init - create UBI debugfs directory.
0217  *
0218  * Create UBI debugfs directory. Returns zero in case of success and a negative
0219  * error code in case of failure.
0220  */
0221 int ubi_debugfs_init(void)
0222 {
0223     if (!IS_ENABLED(CONFIG_DEBUG_FS))
0224         return 0;
0225 
0226     dfs_rootdir = debugfs_create_dir("ubi", NULL);
0227     if (IS_ERR_OR_NULL(dfs_rootdir)) {
0228         int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV;
0229 
0230         pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",
0231                err);
0232         return err;
0233     }
0234 
0235     return 0;
0236 }
0237 
0238 /**
0239  * ubi_debugfs_exit - remove UBI debugfs directory.
0240  */
0241 void ubi_debugfs_exit(void)
0242 {
0243     if (IS_ENABLED(CONFIG_DEBUG_FS))
0244         debugfs_remove(dfs_rootdir);
0245 }
0246 
0247 /* Read an UBI debugfs file */
0248 static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
0249                  size_t count, loff_t *ppos)
0250 {
0251     unsigned long ubi_num = (unsigned long)file->private_data;
0252     struct dentry *dent = file->f_path.dentry;
0253     struct ubi_device *ubi;
0254     struct ubi_debug_info *d;
0255     char buf[8];
0256     int val;
0257 
0258     ubi = ubi_get_device(ubi_num);
0259     if (!ubi)
0260         return -ENODEV;
0261     d = &ubi->dbg;
0262 
0263     if (dent == d->dfs_chk_gen)
0264         val = d->chk_gen;
0265     else if (dent == d->dfs_chk_io)
0266         val = d->chk_io;
0267     else if (dent == d->dfs_chk_fastmap)
0268         val = d->chk_fastmap;
0269     else if (dent == d->dfs_disable_bgt)
0270         val = d->disable_bgt;
0271     else if (dent == d->dfs_emulate_bitflips)
0272         val = d->emulate_bitflips;
0273     else if (dent == d->dfs_emulate_io_failures)
0274         val = d->emulate_io_failures;
0275     else if (dent == d->dfs_emulate_power_cut) {
0276         snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
0277         count = simple_read_from_buffer(user_buf, count, ppos,
0278                         buf, strlen(buf));
0279         goto out;
0280     } else if (dent == d->dfs_power_cut_min) {
0281         snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
0282         count = simple_read_from_buffer(user_buf, count, ppos,
0283                         buf, strlen(buf));
0284         goto out;
0285     } else if (dent == d->dfs_power_cut_max) {
0286         snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
0287         count = simple_read_from_buffer(user_buf, count, ppos,
0288                         buf, strlen(buf));
0289         goto out;
0290     }
0291     else {
0292         count = -EINVAL;
0293         goto out;
0294     }
0295 
0296     if (val)
0297         buf[0] = '1';
0298     else
0299         buf[0] = '0';
0300     buf[1] = '\n';
0301     buf[2] = 0x00;
0302 
0303     count = simple_read_from_buffer(user_buf, count, ppos, buf, 2);
0304 
0305 out:
0306     ubi_put_device(ubi);
0307     return count;
0308 }
0309 
0310 /* Write an UBI debugfs file */
0311 static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
0312                   size_t count, loff_t *ppos)
0313 {
0314     unsigned long ubi_num = (unsigned long)file->private_data;
0315     struct dentry *dent = file->f_path.dentry;
0316     struct ubi_device *ubi;
0317     struct ubi_debug_info *d;
0318     size_t buf_size;
0319     char buf[8] = {0};
0320     int val;
0321 
0322     ubi = ubi_get_device(ubi_num);
0323     if (!ubi)
0324         return -ENODEV;
0325     d = &ubi->dbg;
0326 
0327     buf_size = min_t(size_t, count, (sizeof(buf) - 1));
0328     if (copy_from_user(buf, user_buf, buf_size)) {
0329         count = -EFAULT;
0330         goto out;
0331     }
0332 
0333     if (dent == d->dfs_power_cut_min) {
0334         if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
0335             count = -EINVAL;
0336         goto out;
0337     } else if (dent == d->dfs_power_cut_max) {
0338         if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
0339             count = -EINVAL;
0340         goto out;
0341     } else if (dent == d->dfs_emulate_power_cut) {
0342         if (kstrtoint(buf, 0, &val) != 0)
0343             count = -EINVAL;
0344         else
0345             d->emulate_power_cut = val;
0346         goto out;
0347     }
0348 
0349     if (buf[0] == '1')
0350         val = 1;
0351     else if (buf[0] == '0')
0352         val = 0;
0353     else {
0354         count = -EINVAL;
0355         goto out;
0356     }
0357 
0358     if (dent == d->dfs_chk_gen)
0359         d->chk_gen = val;
0360     else if (dent == d->dfs_chk_io)
0361         d->chk_io = val;
0362     else if (dent == d->dfs_chk_fastmap)
0363         d->chk_fastmap = val;
0364     else if (dent == d->dfs_disable_bgt)
0365         d->disable_bgt = val;
0366     else if (dent == d->dfs_emulate_bitflips)
0367         d->emulate_bitflips = val;
0368     else if (dent == d->dfs_emulate_io_failures)
0369         d->emulate_io_failures = val;
0370     else
0371         count = -EINVAL;
0372 
0373 out:
0374     ubi_put_device(ubi);
0375     return count;
0376 }
0377 
0378 /* File operations for all UBI debugfs files except
0379  * detailed_erase_block_info
0380  */
0381 static const struct file_operations dfs_fops = {
0382     .read   = dfs_file_read,
0383     .write  = dfs_file_write,
0384     .open   = simple_open,
0385     .llseek = no_llseek,
0386     .owner  = THIS_MODULE,
0387 };
0388 
0389 /* As long as the position is less then that total number of erase blocks,
0390  * we still have more to print.
0391  */
0392 static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos)
0393 {
0394     struct ubi_device *ubi = s->private;
0395 
0396     if (*pos < ubi->peb_count)
0397         return pos;
0398 
0399     return NULL;
0400 }
0401 
0402 /* Since we are using the position as the iterator, we just need to check if we
0403  * are done and increment the position.
0404  */
0405 static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos)
0406 {
0407     struct ubi_device *ubi = s->private;
0408 
0409     (*pos)++;
0410 
0411     if (*pos < ubi->peb_count)
0412         return pos;
0413 
0414     return NULL;
0415 }
0416 
0417 static void eraseblk_count_seq_stop(struct seq_file *s, void *v)
0418 {
0419 }
0420 
0421 static int eraseblk_count_seq_show(struct seq_file *s, void *iter)
0422 {
0423     struct ubi_device *ubi = s->private;
0424     struct ubi_wl_entry *wl;
0425     int *block_number = iter;
0426     int erase_count = -1;
0427     int err;
0428 
0429     /* If this is the start, print a header */
0430     if (*block_number == 0)
0431         seq_puts(s, "physical_block_number\terase_count\n");
0432 
0433     err = ubi_io_is_bad(ubi, *block_number);
0434     if (err)
0435         return err;
0436 
0437     spin_lock(&ubi->wl_lock);
0438 
0439     wl = ubi->lookuptbl[*block_number];
0440     if (wl)
0441         erase_count = wl->ec;
0442 
0443     spin_unlock(&ubi->wl_lock);
0444 
0445     if (erase_count < 0)
0446         return 0;
0447 
0448     seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count);
0449 
0450     return 0;
0451 }
0452 
0453 static const struct seq_operations eraseblk_count_seq_ops = {
0454     .start = eraseblk_count_seq_start,
0455     .next = eraseblk_count_seq_next,
0456     .stop = eraseblk_count_seq_stop,
0457     .show = eraseblk_count_seq_show
0458 };
0459 
0460 static int eraseblk_count_open(struct inode *inode, struct file *f)
0461 {
0462     struct seq_file *s;
0463     int err;
0464 
0465     err = seq_open(f, &eraseblk_count_seq_ops);
0466     if (err)
0467         return err;
0468 
0469     s = f->private_data;
0470     s->private = ubi_get_device((unsigned long)inode->i_private);
0471 
0472     if (!s->private)
0473         return -ENODEV;
0474     else
0475         return 0;
0476 }
0477 
0478 static int eraseblk_count_release(struct inode *inode, struct file *f)
0479 {
0480     struct seq_file *s = f->private_data;
0481     struct ubi_device *ubi = s->private;
0482 
0483     ubi_put_device(ubi);
0484 
0485     return seq_release(inode, f);
0486 }
0487 
0488 static const struct file_operations eraseblk_count_fops = {
0489     .owner = THIS_MODULE,
0490     .open = eraseblk_count_open,
0491     .read = seq_read,
0492     .llseek = seq_lseek,
0493     .release = eraseblk_count_release,
0494 };
0495 
0496 /**
0497  * ubi_debugfs_init_dev - initialize debugfs for an UBI device.
0498  * @ubi: UBI device description object
0499  *
0500  * This function creates all debugfs files for UBI device @ubi. Returns zero in
0501  * case of success and a negative error code in case of failure.
0502  */
0503 int ubi_debugfs_init_dev(struct ubi_device *ubi)
0504 {
0505     unsigned long ubi_num = ubi->ubi_num;
0506     struct ubi_debug_info *d = &ubi->dbg;
0507     int n;
0508 
0509     if (!IS_ENABLED(CONFIG_DEBUG_FS))
0510         return 0;
0511 
0512     n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
0513              ubi->ubi_num);
0514     if (n > UBI_DFS_DIR_LEN) {
0515         /* The array size is too small */
0516         return -EINVAL;
0517     }
0518 
0519     d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir);
0520 
0521     d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir,
0522                          (void *)ubi_num, &dfs_fops);
0523 
0524     d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir,
0525                         (void *)ubi_num, &dfs_fops);
0526 
0527     d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR,
0528                          d->dfs_dir, (void *)ubi_num,
0529                          &dfs_fops);
0530 
0531     d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR,
0532                          d->dfs_dir, (void *)ubi_num,
0533                          &dfs_fops);
0534 
0535     d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips",
0536                               S_IWUSR, d->dfs_dir,
0537                               (void *)ubi_num,
0538                               &dfs_fops);
0539 
0540     d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures",
0541                              S_IWUSR, d->dfs_dir,
0542                              (void *)ubi_num,
0543                              &dfs_fops);
0544 
0545     d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut",
0546                                S_IWUSR, d->dfs_dir,
0547                                (void *)ubi_num,
0548                                &dfs_fops);
0549 
0550     d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min",
0551                            S_IWUSR, d->dfs_dir,
0552                            (void *)ubi_num, &dfs_fops);
0553 
0554     d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max",
0555                            S_IWUSR, d->dfs_dir,
0556                            (void *)ubi_num, &dfs_fops);
0557 
0558     debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir,
0559                 (void *)ubi_num, &eraseblk_count_fops);
0560 
0561     return 0;
0562 }
0563 
0564 /**
0565  * ubi_debugfs_exit_dev - free all debugfs files corresponding to device @ubi
0566  * @ubi: UBI device description object
0567  */
0568 void ubi_debugfs_exit_dev(struct ubi_device *ubi)
0569 {
0570     if (IS_ENABLED(CONFIG_DEBUG_FS))
0571         debugfs_remove_recursive(ubi->dbg.dfs_dir);
0572 }
0573 
0574 /**
0575  * ubi_dbg_power_cut - emulate a power cut if it is time to do so
0576  * @ubi: UBI device description object
0577  * @caller: Flags set to indicate from where the function is being called
0578  *
0579  * Returns non-zero if a power cut was emulated, zero if not.
0580  */
0581 int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
0582 {
0583     unsigned int range;
0584 
0585     if ((ubi->dbg.emulate_power_cut & caller) == 0)
0586         return 0;
0587 
0588     if (ubi->dbg.power_cut_counter == 0) {
0589         ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
0590 
0591         if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
0592             range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
0593             ubi->dbg.power_cut_counter += prandom_u32() % range;
0594         }
0595         return 0;
0596     }
0597 
0598     ubi->dbg.power_cut_counter--;
0599     if (ubi->dbg.power_cut_counter)
0600         return 0;
0601 
0602     ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
0603     ubi_ro_mode(ubi);
0604     return 1;
0605 }
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