Merge tag 'upstream-3.7-rc1' of git://git.infradead.org/linux-ubi

Pull UBI changes from Artem Bityutskiy:
 "The main change is the way we reserve eraseblocks for bad blocks
  handling.  We used to reserve 2% of the partition, but now we are more
  aggressive and we reserve 2% of the entire chip, which is what
  actually manufacturers specify in data sheets.  We introduced an
  option to users to override the default, though.

  There are a couple of fixes as well, and a number of cleanups."

* tag 'upstream-3.7-rc1' of git://git.infradead.org/linux-ubi: (24 commits)
  UBI: fix trivial typo 'it' => 'is'
  UBI: load after mtd device drivers
  UBI: print less
  UBI: use pr_ helper instead of printk
  UBI: comply with coding style
  UBI: erase free PEB with bitflip in EC header
  UBI: fix autoresize handling in R/O mode
  UBI: add max_beb_per1024 to attach ioctl
  UBI: allow specifying bad PEBs limit using module parameter
  UBI: check max_beb_per1024 value in ubi_attach_mtd_dev
  UBI: prepare for max_beb_per1024 module parameter addition
  UBI: introduce MTD_PARAM_MAX_COUNT
  UBI: separate bad_peb_limit in a function
  arm: sam9_l9260_defconfig: correct CONFIG_MTD_UBI_BEB_LIMIT
  UBI: use the whole MTD device size to get bad_peb_limit
  mtd: mtdparts: introduce mtd_get_device_size
  mtd: mark mtd_is_partition argument as constant
  arm: sam9_l9260_defconfig: remove non-existing config option
  UBI: kill CONFIG_MTD_UBI_BEB_RESERVE
  UBI: limit amount of reserved eraseblocks for bad PEB handling
  ...

arch/arm/configs/sam9_l9260_defconfig

@@ -39,7 +39,7 @@ CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_ATMEL=y
 CONFIG_MTD_NAND_PLATFORM=y
 CONFIG_MTD_UBI=y
-CONFIG_MTD_UBI_BEB_RESERVE=3
+CONFIG_MTD_UBI_BEB_LIMIT=25
 CONFIG_MTD_UBI_GLUEBI=y
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_RAM=y

drivers/mtd/mtdpart.c

@@ -744,7 +744,7 @@ int parse_mtd_partitions(struct mtd_info *master, const char **types,
 	return ret;
 }
 
-int mtd_is_partition(struct mtd_info *mtd)
+int mtd_is_partition(const struct mtd_info *mtd)
 {
 	struct mtd_part *part;
 	int ispart = 0;
@@ -760,3 +760,13 @@ int mtd_is_partition(struct mtd_info *mtd)
 	return ispart;
 }
 EXPORT_SYMBOL_GPL(mtd_is_partition);
+
+/* Returns the size of the entire flash chip */
+uint64_t mtd_get_device_size(const struct mtd_info *mtd)
+{
+	if (!mtd_is_partition(mtd))
+		return mtd->size;
+
+	return PART(mtd)->master->size;
+}
+EXPORT_SYMBOL_GPL(mtd_get_device_size);

drivers/mtd/ubi/Kconfig

@@ -27,20 +27,34 @@ config MTD_UBI_WL_THRESHOLD
 	  life-cycle less than 10000, the threshold should be lessened (e.g.,
 	  to 128 or 256, although it does not have to be power of 2).
 
-config MTD_UBI_BEB_RESERVE
-	int "Percentage of reserved eraseblocks for bad eraseblocks handling"
-	default 2
-	range 0 25
+config MTD_UBI_BEB_LIMIT
+	int "Maximum expected bad eraseblock count per 1024 eraseblocks"
+	default 20
+	range 0 768
 	help
-	  If the MTD device admits of bad eraseblocks (e.g. NAND flash), UBI
-	  reserves some amount of physical eraseblocks to handle new bad
-	  eraseblocks. For example, if a flash physical eraseblock becomes bad,
-	  UBI uses these reserved physical eraseblocks to relocate the bad one.
-	  This option specifies how many physical eraseblocks will be reserved
-	  for bad eraseblock handling (percents of total number of good flash
-	  eraseblocks). If the underlying flash does not admit of bad
-	  eraseblocks (e.g. NOR flash), this value is ignored and nothing is
-	  reserved. Leave the default value if unsure.
+	  This option specifies the maximum bad physical eraseblocks UBI
+	  expects on the MTD device (per 1024 eraseblocks). If the underlying
+	  flash does not admit of bad eraseblocks (e.g. NOR flash), this value
+	  is ignored.
+
+	  NAND datasheets often specify the minimum and maximum NVM (Number of
+	  Valid Blocks) for the flashes' endurance lifetime. The maximum
+	  expected bad eraseblocks per 1024 eraseblocks then can be calculated
+	  as "1024 * (1 - MinNVB / MaxNVB)", which gives 20 for most NANDs
+	  (MaxNVB is basically the total count of eraseblocks on the chip).
+
+	  To put it differently, if this value is 20, UBI will try to reserve
+	  about 1.9% of physical eraseblocks for bad blocks handling. And that
+	  will be 1.9% of eraseblocks on the entire NAND chip, not just the MTD
+	  partition UBI attaches. This means that if you have, say, a NAND
+	  flash chip admits maximum 40 bad eraseblocks, and it is split on two
+	  MTD partitions of the same size, UBI will reserve 40 eraseblocks when
+	  attaching a partition.
+
+	  This option can be overridden by the "mtd=" UBI module parameter or
+	  by the "attach" ioctl.
+
+	  Leave the default value if unsure.
 
 config MTD_UBI_GLUEBI
 	tristate "MTD devices emulation driver (gluebi)"

drivers/mtd/ubi/attach.c

@@ -79,7 +79,7 @@
  *     NAND), it is probably a PEB which was being erased when power cut
  *     happened, so this is corruption type 1. However, this is just a guess,
  *     which might be wrong.
- *   o Otherwise this it corruption type 2.
+ *   o Otherwise this is corruption type 2.
  */
 
 #include <linux/err.h>
@@ -378,8 +378,8 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
 			if (err == UBI_IO_BITFLIPS)
 				bitflips = 1;
 			else {
-				ubi_err("VID of PEB %d header is bad, but it "
-					"was OK earlier, err %d", pnum, err);
+				ubi_err("VID of PEB %d header is bad, but it was OK earlier, err %d",
+					pnum, err);
 				if (err > 0)
 					err = -EIO;
 
@@ -790,11 +790,11 @@ static int check_corruption(struct ubi_device *ubi, struct ubi_vid_hdr *vid_hdr,
 	if (ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->leb_size))
 		goto out_unlock;
 
-	ubi_err("PEB %d contains corrupted VID header, and the data does not "
-		"contain all 0xFF, this may be a non-UBI PEB or a severe VID "
-		"header corruption which requires manual inspection", pnum);
+	ubi_err("PEB %d contains corrupted VID header, and the data does not contain all 0xFF",
+		pnum);
+	ubi_err("this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection");
 	ubi_dump_vid_hdr(vid_hdr);
-	dbg_msg("hexdump of PEB %d offset %d, length %d",
+	pr_err("hexdump of PEB %d offset %d, length %d",
 	       pnum, ubi->leb_start, ubi->leb_size);
 	ubi_dbg_print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
 			       ubi->peb_buf, ubi->leb_size, 1);
@@ -907,8 +907,8 @@ static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
 			ubi->image_seq = image_seq;
 		if (ubi->image_seq && image_seq &&
 		    ubi->image_seq != image_seq) {
-			ubi_err("bad image sequence number %d in PEB %d, "
-				"expected %d", image_seq, pnum, ubi->image_seq);
+			ubi_err("bad image sequence number %d in PEB %d, expected %d",
+				image_seq, pnum, ubi->image_seq);
 			ubi_dump_ec_hdr(ech);
 			return -EINVAL;
 		}
@@ -975,7 +975,7 @@ static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
 			return err;
 		goto adjust_mean_ec;
 	case UBI_IO_FF:
-		if (ec_err)
+		if (ec_err || bitflips)
 			err = add_to_list(ai, pnum, UBI_UNKNOWN,
 					  UBI_UNKNOWN, ec, 1, &ai->erase);
 		else
@@ -997,8 +997,8 @@ static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
 		/* Unsupported internal volume */
 		switch (vidh->compat) {
 		case UBI_COMPAT_DELETE:
-			ubi_msg("\"delete\" compatible internal volume %d:%d"
-				" found, will remove it", vol_id, lnum);
+			ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it",
+				vol_id, lnum);
 			err = add_to_list(ai, pnum, vol_id, lnum,
 					  ec, 1, &ai->erase);
 			if (err)
@@ -1006,15 +1006,14 @@ static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
 			return 0;
 
 		case UBI_COMPAT_RO:
-			ubi_msg("read-only compatible internal volume %d:%d"
-				" found, switch to read-only mode",
+			ubi_msg("read-only compatible internal volume %d:%d found, switch to read-only mode",
 				vol_id, lnum);
 			ubi->ro_mode = 1;
 			break;
 
 		case UBI_COMPAT_PRESERVE:
-			ubi_msg("\"preserve\" compatible internal volume %d:%d"
-				" found", vol_id, lnum);
+			ubi_msg("\"preserve\" compatible internal volume %d:%d found",
+				vol_id, lnum);
 			err = add_to_list(ai, pnum, vol_id, lnum,
 					  ec, 0, &ai->alien);
 			if (err)
@@ -1075,10 +1074,10 @@ static int late_analysis(struct ubi_device *ubi, struct ubi_attach_info *ai)
 	if (ai->corr_peb_count) {
 		ubi_err("%d PEBs are corrupted and preserved",
 			ai->corr_peb_count);
-		printk(KERN_ERR "Corrupted PEBs are:");
+		pr_err("Corrupted PEBs are:");
 		list_for_each_entry(aeb, &ai->corr, u.list)
-			printk(KERN_CONT " %d", aeb->pnum);
-		printk(KERN_CONT "\n");
+			pr_cont(" %d", aeb->pnum);
+		pr_cont("\n");
 
 		/*
 		 * If too many PEBs are corrupted, we refuse attaching,
@@ -1112,8 +1111,7 @@ static int late_analysis(struct ubi_device *ubi, struct ubi_attach_info *ai)
 			get_random_bytes(&ubi->image_seq,
 					 sizeof(ubi->image_seq));
 		} else {
-			ubi_err("MTD device is not UBI-formatted and possibly "
-				"contains non-UBI data - refusing it");
+			ubi_err("MTD device is not UBI-formatted and possibly contains non-UBI data - refusing it");
 			return -EINVAL;
 		}
 
@@ -1172,7 +1170,7 @@ static struct ubi_attach_info *scan_all(struct ubi_device *ubi)
 			goto out_vidh;
 	}
 
-	dbg_msg("scanning is finished");
+	ubi_msg("scanning is finished");
 
 	/* Calculate mean erase counter */
 	if (ai->ec_count)
@@ -1244,7 +1242,7 @@ int ubi_attach(struct ubi_device *ubi)
 	ubi->corr_peb_count = ai->corr_peb_count;
 	ubi->max_ec = ai->max_ec;
 	ubi->mean_ec = ai->mean_ec;
-	ubi_msg("max. sequence number:       %llu", ai->max_sqnum);
+	dbg_gen("max. sequence number:       %llu", ai->max_sqnum);
 
 	err = ubi_read_volume_table(ubi, ai);
 	if (err)

drivers/mtd/ubi/cdev.c

@@ -140,9 +140,9 @@ static int vol_cdev_release(struct inode *inode, struct file *file)
 		vol->updating = 0;
 		vfree(vol->upd_buf);
 	} else if (vol->changing_leb) {
-		dbg_gen("only %lld of %lld bytes received for atomic LEB change"
-			" for volume %d:%d, cancel", vol->upd_received,
-			vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id);
+		dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel",
+			vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num,
+			vol->vol_id);
 		vol->changing_leb = 0;
 		vfree(vol->upd_buf);
 	}
@@ -189,7 +189,8 @@ static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
 	return new_offset;
 }
 
-static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
+			  int datasync)
 {
 	struct ubi_volume_desc *desc = file->private_data;
 	struct ubi_device *ubi = desc->vol->ubi;
@@ -753,7 +754,7 @@ static int rename_volumes(struct ubi_device *ubi,
 		re->new_name_len = name_len;
 		memcpy(re->new_name, name, name_len);
 		list_add_tail(&re->list, &rename_list);
-		dbg_msg("will rename volume %d from \"%s\" to \"%s\"",
+		dbg_gen("will rename volume %d from \"%s\" to \"%s\"",
 			vol_id, re->desc->vol->name, name);
 	}
 
@@ -811,7 +812,7 @@ static int rename_volumes(struct ubi_device *ubi,
 		re1->remove = 1;
 		re1->desc = desc;
 		list_add(&re1->list, &rename_list);
-		dbg_msg("will remove volume %d, name \"%s\"",
+		dbg_gen("will remove volume %d, name \"%s\"",
 			re1->desc->vol->vol_id, re1->desc->vol->name);
 	}
 
@@ -942,7 +943,7 @@ static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
 	{
 		struct ubi_rnvol_req *req;
 
-		dbg_msg("re-name volumes");
+		dbg_gen("re-name volumes");
 		req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
 		if (!req) {
 			err = -ENOMEM;
@@ -1010,7 +1011,8 @@ static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
 		 * 'ubi_attach_mtd_dev()'.
 		 */
 		mutex_lock(&ubi_devices_mutex);
-		err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
+		err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
+					 req.max_beb_per1024);
 		mutex_unlock(&ubi_devices_mutex);
 		if (err < 0)
 			put_mtd_device(mtd);

drivers/mtd/ubi/debug.h

@@ -29,7 +29,7 @@ void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr);
 
 #define ubi_assert(expr)  do {                                               \
 	if (unlikely(!(expr))) {                                             \
-		printk(KERN_CRIT "UBI assert failed in %s at %u (pid %d)\n", \
+		pr_crit("UBI assert failed in %s at %u (pid %d)\n",          \
 		       __func__, __LINE__, current->pid);                    \
 		dump_stack();                                                \
 	}                                                                    \
@@ -39,12 +39,8 @@ void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr);
 		print_hex_dump(l, ps, pt, r, g, b, len, a)
 
 #define ubi_dbg_msg(type, fmt, ...) \
-	pr_debug("UBI DBG " type ": " fmt "\n", ##__VA_ARGS__)
-
-/* Just a debugging messages not related to any specific UBI subsystem */
-#define dbg_msg(fmt, ...)                                    \
-	printk(KERN_DEBUG "UBI DBG (pid %d): %s: " fmt "\n", \
-	       current->pid, __func__, ##__VA_ARGS__)
+	pr_debug("UBI DBG " type " (pid %d): " fmt "\n", current->pid,       \
+		 ##__VA_ARGS__)
 
 /* General debugging messages */
 #define dbg_gen(fmt, ...) ubi_dbg_msg("gen", fmt, ##__VA_ARGS__)

drivers/mtd/ubi/eba.c

@@ -420,9 +420,8 @@ int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
 				 */
 				if (err == UBI_IO_BAD_HDR_EBADMSG ||
 				    err == UBI_IO_BAD_HDR) {
-					ubi_warn("corrupted VID header at PEB "
-						 "%d, LEB %d:%d", pnum, vol_id,
-						 lnum);
+					ubi_warn("corrupted VID header at PEB %d, LEB %d:%d",
+						 pnum, vol_id, lnum);
 					err = -EBADMSG;
 				} else
 					ubi_ro_mode(ubi);
@@ -660,9 +659,8 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
 	if (len) {
 		err = ubi_io_write_data(ubi, buf, pnum, offset, len);
 		if (err) {
-			ubi_warn("failed to write %d bytes at offset %d of "
-				 "LEB %d:%d, PEB %d", len, offset, vol_id,
-				 lnum, pnum);
+			ubi_warn("failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
+				 len, offset, vol_id, lnum, pnum);
 			goto write_error;
 		}
 	}
@@ -1040,9 +1038,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
 	 * cancel it.
 	 */
 	if (vol->eba_tbl[lnum] != from) {
-		dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to "
-		       "PEB %d, cancel", vol_id, lnum, from,
-		       vol->eba_tbl[lnum]);
+		dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to PEB %d, cancel",
+		       vol_id, lnum, from, vol->eba_tbl[lnum]);
 		err = MOVE_CANCEL_RACE;
 		goto out_unlock_leb;
 	}
@@ -1107,8 +1104,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
 	err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1);
 	if (err) {
 		if (err != UBI_IO_BITFLIPS) {
-			ubi_warn("error %d while reading VID header back from "
-				  "PEB %d", err, to);
+			ubi_warn("error %d while reading VID header back from PEB %d",
+				 err, to);
 			if (is_error_sane(err))
 				err = MOVE_TARGET_RD_ERR;
 		} else
@@ -1134,8 +1131,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
 		err = ubi_io_read_data(ubi, ubi->peb_buf, to, 0, aldata_size);
 		if (err) {
 			if (err != UBI_IO_BITFLIPS) {
-				ubi_warn("error %d while reading data back "
-					 "from PEB %d", err, to);
+				ubi_warn("error %d while reading data back from PEB %d",
+					 err, to);
 				if (is_error_sane(err))
 					err = MOVE_TARGET_RD_ERR;
 			} else
@@ -1146,8 +1143,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
 		cond_resched();
 
 		if (crc != crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size)) {
-			ubi_warn("read data back from PEB %d and it is "
-				 "different", to);
+			ubi_warn("read data back from PEB %d and it is different",
+				 to);
 			err = -EINVAL;
 			goto out_unlock_buf;
 		}
@@ -1197,8 +1194,8 @@ static void print_rsvd_warning(struct ubi_device *ubi,
 			return;
 	}
 
-	ubi_warn("cannot reserve enough PEBs for bad PEB handling, reserved %d,"
-		 " need %d", ubi->beb_rsvd_pebs, ubi->beb_rsvd_level);
+	ubi_warn("cannot reserve enough PEBs for bad PEB handling, reserved %d, need %d",
+		 ubi->beb_rsvd_pebs, ubi->beb_rsvd_level);
 	if (ubi->corr_peb_count)
 		ubi_warn("%d PEBs are corrupted and not used",
 			 ubi->corr_peb_count);

drivers/mtd/ubi/gluebi.c

@@ -41,7 +41,7 @@
 #include "ubi-media.h"
 
 #define err_msg(fmt, ...)                                   \
-	printk(KERN_DEBUG "gluebi (pid %d): %s: " fmt "\n", \
+	pr_err("gluebi (pid %d): %s: " fmt "\n",            \
 	       current->pid, __func__, ##__VA_ARGS__)
 
 /**
@@ -341,9 +341,8 @@ static int gluebi_create(struct ubi_device_info *di,
 	mutex_lock(&devices_mutex);
 	g = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
 	if (g)
-		err_msg("gluebi MTD device %d form UBI device %d volume %d "
-			"already exists", g->mtd.index, vi->ubi_num,
-			vi->vol_id);
+		err_msg("gluebi MTD device %d form UBI device %d volume %d already exists",
+			g->mtd.index, vi->ubi_num, vi->vol_id);
 	mutex_unlock(&devices_mutex);
 
 	if (mtd_device_register(mtd, NULL, 0)) {
@@ -376,8 +375,8 @@ static int gluebi_remove(struct ubi_volume_info *vi)
 	mutex_lock(&devices_mutex);
 	gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
 	if (!gluebi) {
-		err_msg("got remove notification for unknown UBI device %d "
-			"volume %d", vi->ubi_num, vi->vol_id);
+		err_msg("got remove notification for unknown UBI device %d volume %d",
+			vi->ubi_num, vi->vol_id);
 		err = -ENOENT;
 	} else if (gluebi->refcnt)
 		err = -EBUSY;
@@ -390,9 +389,8 @@ static int gluebi_remove(struct ubi_volume_info *vi)
 	mtd = &gluebi->mtd;
 	err = mtd_device_unregister(mtd);
 	if (err) {
-		err_msg("cannot remove fake MTD device %d, UBI device %d, "
-			"volume %d, error %d", mtd->index, gluebi->ubi_num,
-			gluebi->vol_id, err);
+		err_msg("cannot remove fake MTD device %d, UBI device %d, volume %d, error %d",
+			mtd->index, gluebi->ubi_num, gluebi->vol_id, err);
 		mutex_lock(&devices_mutex);
 		list_add_tail(&gluebi->list, &gluebi_devices);
 		mutex_unlock(&devices_mutex);
@@ -422,8 +420,8 @@ static int gluebi_updated(struct ubi_volume_info *vi)
 	gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
 	if (!gluebi) {
 		mutex_unlock(&devices_mutex);
-		err_msg("got update notification for unknown UBI device %d "
-			"volume %d", vi->ubi_num, vi->vol_id);
+		err_msg("got update notification for unknown UBI device %d volume %d",
+			vi->ubi_num, vi->vol_id);
 		return -ENOENT;
 	}
 
@@ -449,8 +447,8 @@ static int gluebi_resized(struct ubi_volume_info *vi)
 	gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
 	if (!gluebi) {
 		mutex_unlock(&devices_mutex);
-		err_msg("got update notification for unknown UBI device %d "
-			"volume %d", vi->ubi_num, vi->vol_id);
+		err_msg("got update notification for unknown UBI device %d volume %d",
+			vi->ubi_num, vi->vol_id);
 		return -ENOENT;
 	}
 	gluebi->mtd.size = vi->used_bytes;
@@ -507,9 +505,9 @@ static void __exit ubi_gluebi_exit(void)
 
 		err = mtd_device_unregister(mtd);
 		if (err)
-			err_msg("error %d while removing gluebi MTD device %d, "
-				"UBI device %d, volume %d - ignoring", err,
-				mtd->index, gluebi->ubi_num, gluebi->vol_id);
+			err_msg("error %d while removing gluebi MTD device %d, UBI device %d, volume %d - ignoring",
+				err, mtd->index, gluebi->ubi_num,
+				gluebi->vol_id);
 		kfree(mtd->name);
 		kfree(gluebi);
 	}

drivers/mtd/ubi/io.c

@@ -177,21 +177,20 @@ int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
 			 * enabled. A corresponding message will be printed
 			 * later, when it is has been scrubbed.
 			 */
-			dbg_msg("fixable bit-flip detected at PEB %d", pnum);
+			ubi_msg("fixable bit-flip detected at PEB %d", pnum);
 			ubi_assert(len == read);
 			return UBI_IO_BITFLIPS;
 		}
 
 		if (retries++ < UBI_IO_RETRIES) {
-			ubi_warn("error %d%s while reading %d bytes from PEB "
-				 "%d:%d, read only %zd bytes, retry",
+			ubi_warn("error %d%s while reading %d bytes from PEB %d:%d, read only %zd bytes, retry",
 				 err, errstr, len, pnum, offset, read);
 			yield();
 			goto retry;
 		}
 
-		ubi_err("error %d%s while reading %d bytes from PEB %d:%d, "
-			"read %zd bytes", err, errstr, len, pnum, offset, read);
+		ubi_err("error %d%s while reading %d bytes from PEB %d:%d, read %zd bytes",
+			err, errstr, len, pnum, offset, read);
 		dump_stack();
 
 		/*
@@ -274,8 +273,8 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
 	}
 
 	if (ubi_dbg_is_write_failure(ubi)) {
-		ubi_err("cannot write %d bytes to PEB %d:%d "
-			"(emulated)", len, pnum, offset);
+		ubi_err("cannot write %d bytes to PEB %d:%d (emulated)",
+			len, pnum, offset);
 		dump_stack();
 		return -EIO;
 	}
@@ -283,8 +282,8 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
 	addr = (loff_t)pnum * ubi->peb_size + offset;
 	err = mtd_write(ubi->mtd, addr, len, &written, buf);
 	if (err) {
-		ubi_err("error %d while writing %d bytes to PEB %d:%d, written "
-			"%zd bytes", err, len, pnum, offset, written);
+		ubi_err("error %d while writing %d bytes to PEB %d:%d, written %zd bytes",
+			err, len, pnum, offset, written);
 		dump_stack();
 		ubi_dump_flash(ubi, pnum, offset, len);
 	} else
@@ -685,8 +684,7 @@ static int validate_ec_hdr(const struct ubi_device *ubi,
 	leb_start = be32_to_cpu(ec_hdr->data_offset);
 
 	if (ec_hdr->version != UBI_VERSION) {
-		ubi_err("node with incompatible UBI version found: "
-			"this UBI version is %d, image version is %d",
+		ubi_err("node with incompatible UBI version found: this UBI version is %d, image version is %d",
 			UBI_VERSION, (int)ec_hdr->version);
 		goto bad;
 	}
@@ -777,10 +775,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
 		if (ubi_check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) {
 			/* The physical eraseblock is supposedly empty */
 			if (verbose)
-				ubi_warn("no EC header found at PEB %d, "
-					 "only 0xFF bytes", pnum);
-			dbg_bld("no EC header found at PEB %d, "
-				"only 0xFF bytes", pnum);
+				ubi_warn("no EC header found at PEB %d, only 0xFF bytes",
+					 pnum);
+			dbg_bld("no EC header found at PEB %d, only 0xFF bytes",
+				pnum);
 			if (!read_err)
 				return UBI_IO_FF;
 			else
@@ -792,12 +790,12 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
 		 * 0xFF bytes. Report that the header is corrupted.
 		 */
 		if (verbose) {
-			ubi_warn("bad magic number at PEB %d: %08x instead of "
-				 "%08x", pnum, magic, UBI_EC_HDR_MAGIC);
+			ubi_warn("bad magic number at PEB %d: %08x instead of %08x",
+				 pnum, magic, UBI_EC_HDR_MAGIC);
 			ubi_dump_ec_hdr(ec_hdr);
 		}
-		dbg_bld("bad magic number at PEB %d: %08x instead of "
-			"%08x", pnum, magic, UBI_EC_HDR_MAGIC);
+		dbg_bld("bad magic number at PEB %d: %08x instead of %08x",
+			pnum, magic, UBI_EC_HDR_MAGIC);
 		return UBI_IO_BAD_HDR;
 	}
 
@@ -806,12 +804,12 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
 
 	if (hdr_crc != crc) {
 		if (verbose) {
-			ubi_warn("bad EC header CRC at PEB %d, calculated "
-				 "%#08x, read %#08x", pnum, crc, hdr_crc);
+			ubi_warn("bad EC header CRC at PEB %d, calculated %#08x, read %#08x",
+				 pnum, crc, hdr_crc);
 			ubi_dump_ec_hdr(ec_hdr);
 		}
-		dbg_bld("bad EC header CRC at PEB %d, calculated "
-			"%#08x, read %#08x", pnum, crc, hdr_crc);
+		dbg_bld("bad EC header CRC at PEB %d, calculated %#08x, read %#08x",
+			pnum, crc, hdr_crc);
 
 		if (!read_err)
 			return UBI_IO_BAD_HDR;
@@ -1032,10 +1030,10 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
 
 		if (ubi_check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
 			if (verbose)
-				ubi_warn("no VID header found at PEB %d, "
-					 "only 0xFF bytes", pnum);
-			dbg_bld("no VID header found at PEB %d, "
-				"only 0xFF bytes", pnum);
+				ubi_warn("no VID header found at PEB %d, only 0xFF bytes",
+					 pnum);
+			dbg_bld("no VID header found at PEB %d, only 0xFF bytes",
+				pnum);
 			if (!read_err)
 				return UBI_IO_FF;
 			else
@@ -1043,12 +1041,12 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
 		}
 
 		if (verbose) {
-			ubi_warn("bad magic number at PEB %d: %08x instead of "
-				 "%08x", pnum, magic, UBI_VID_HDR_MAGIC);
+			ubi_warn("bad magic number at PEB %d: %08x instead of %08x",
+				 pnum, magic, UBI_VID_HDR_MAGIC);
 			ubi_dump_vid_hdr(vid_hdr);
 		}
-		dbg_bld("bad magic number at PEB %d: %08x instead of "
-			"%08x", pnum, magic, UBI_VID_HDR_MAGIC);
+		dbg_bld("bad magic number at PEB %d: %08x instead of %08x",
+			pnum, magic, UBI_VID_HDR_MAGIC);
 		return UBI_IO_BAD_HDR;
 	}
 
@@ -1057,12 +1055,12 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
 
 	if (hdr_crc != crc) {
 		if (verbose) {
-			ubi_warn("bad CRC at PEB %d, calculated %#08x, "
-				 "read %#08x", pnum, crc, hdr_crc);
+			ubi_warn("bad CRC at PEB %d, calculated %#08x, read %#08x",
+				 pnum, crc, hdr_crc);
 			ubi_dump_vid_hdr(vid_hdr);
 		}
-		dbg_bld("bad CRC at PEB %d, calculated %#08x, "
-			"read %#08x", pnum, crc, hdr_crc);
+		dbg_bld("bad CRC at PEB %d, calculated %#08x, read %#08x",
+			pnum, crc, hdr_crc);
 		if (!read_err)
 			return UBI_IO_BAD_HDR;
 		else
@@ -1300,8 +1298,8 @@ static int self_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
 	crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_EC_HDR_SIZE_CRC);
 	hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
 	if (hdr_crc != crc) {
-		ubi_err("bad VID header CRC at PEB %d, calculated %#08x, "
-			"read %#08x", pnum, crc, hdr_crc);
+		ubi_err("bad VID header CRC at PEB %d, calculated %#08x, read %#08x",
+			pnum, crc, hdr_crc);
 		ubi_err("self-check failed for PEB %d", pnum);
 		ubi_dump_vid_hdr(vid_hdr);
 		dump_stack();
@@ -1411,15 +1409,15 @@ int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
 
 	err = mtd_read(ubi->mtd, addr, len, &read, buf);
 	if (err && !mtd_is_bitflip(err)) {
-		ubi_err("error %d while reading %d bytes from PEB %d:%d, "
-			"read %zd bytes", err, len, pnum, offset, read);
+		ubi_err("error %d while reading %d bytes from PEB %d:%d, read %zd bytes",
+			err, len, pnum, offset, read);
 		goto error;
 	}
 
 	err = ubi_check_pattern(buf, 0xFF, len);
 	if (err == 0) {
-		ubi_err("flash region at PEB %d:%d, length %d does not "
-			"contain all 0xFF bytes", pnum, offset, len);
+		ubi_err("flash region at PEB %d:%d, length %d does not contain all 0xFF bytes",
+			pnum, offset, len);
 		goto fail;
 	}
 

drivers/mtd/ubi/misc.c

@@ -121,10 +121,16 @@ void ubi_update_reserved(struct ubi_device *ubi)
  */
 void ubi_calculate_reserved(struct ubi_device *ubi)
 {
-	ubi->beb_rsvd_level = ubi->good_peb_count/100;
-	ubi->beb_rsvd_level *= CONFIG_MTD_UBI_BEB_RESERVE;
-	if (ubi->beb_rsvd_level < MIN_RESEVED_PEBS)
-		ubi->beb_rsvd_level = MIN_RESEVED_PEBS;
+	/*
+	 * Calculate the actual number of PEBs currently needed to be reserved
+	 * for future bad eraseblock handling.
+	 */
+	ubi->beb_rsvd_level = ubi->bad_peb_limit - ubi->bad_peb_count;
+	if (ubi->beb_rsvd_level < 0) {
+		ubi->beb_rsvd_level = 0;
+		ubi_warn("number of bad PEBs (%d) is above the expected limit (%d), not reserving any PEBs for bad PEB handling, will use available PEBs (if any)",
+			 ubi->bad_peb_count, ubi->bad_peb_limit);
+	}
 }
 
 /**

drivers/mtd/ubi/ubi.h

@@ -51,17 +51,14 @@
 #define UBI_NAME_STR "ubi"
 
 /* Normal UBI messages */
-#define ubi_msg(fmt, ...) printk(KERN_NOTICE "UBI: " fmt "\n", ##__VA_ARGS__)
+#define ubi_msg(fmt, ...) pr_notice("UBI: " fmt "\n", ##__VA_ARGS__)
 /* UBI warning messages */
-#define ubi_warn(fmt, ...) printk(KERN_WARNING "UBI warning: %s: " fmt "\n", \
+#define ubi_warn(fmt, ...) pr_warn("UBI warning: %s: " fmt "\n",  \
 				   __func__, ##__VA_ARGS__)
 /* UBI error messages */
-#define ubi_err(fmt, ...) printk(KERN_ERR "UBI error: %s: " fmt "\n", \
+#define ubi_err(fmt, ...) pr_err("UBI error: %s: " fmt "\n",      \
 				 __func__, ##__VA_ARGS__)
 
-/* Lowest number PEBs reserved for bad PEB handling */
-#define MIN_RESEVED_PEBS 2
-
 /* Background thread name pattern */
 #define UBI_BGT_NAME_PATTERN "ubi_bgt%dd"
 
@@ -363,6 +360,7 @@ struct ubi_wl_entry;
  * @flash_size: underlying MTD device size (in bytes)
  * @peb_count: count of physical eraseblocks on the MTD device
  * @peb_size: physical eraseblock size
+ * @bad_peb_limit: top limit of expected bad physical eraseblocks
  * @bad_peb_count: count of bad physical eraseblocks
  * @good_peb_count: count of good physical eraseblocks
  * @corr_peb_count: count of corrupted physical eraseblocks (preserved and not
@@ -410,6 +408,7 @@ struct ubi_device {
 	int avail_pebs;
 	int beb_rsvd_pebs;
 	int beb_rsvd_level;
+	int bad_peb_limit;
 
 	int autoresize_vol_id;
 	int vtbl_slots;
@@ -694,7 +693,8 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
 			 struct ubi_vid_hdr *vid_hdr);
 
 /* build.c */
-int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset);
+int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
+		       int vid_hdr_offset, int max_beb_per1024);
 int ubi_detach_mtd_dev(int ubi_num, int anyway);
 struct ubi_device *ubi_get_device(int ubi_num);
 void ubi_put_device(struct ubi_device *ubi);

drivers/mtd/ubi/vtbl.c

@@ -270,8 +270,8 @@ static int vtbl_check(const struct ubi_device *ubi,
 
 			if (len1 > 0 && len1 == len2 &&
 			    !strncmp(vtbl[i].name, vtbl[n].name, len1)) {
-				ubi_err("volumes %d and %d have the same name"
-					" \"%s\"", i, n, vtbl[i].name);
+				ubi_err("volumes %d and %d have the same name \"%s\"",
+					i, n, vtbl[i].name);
 				ubi_dump_vtbl_record(&vtbl[i], i);
 				ubi_dump_vtbl_record(&vtbl[n], n);
 				return -EINVAL;
@@ -304,7 +304,7 @@ static int create_vtbl(struct ubi_device *ubi, struct ubi_attach_info *ai,
 	struct ubi_vid_hdr *vid_hdr;
 	struct ubi_ainf_peb *new_aeb;
 
-	ubi_msg("create volume table (copy #%d)", copy + 1);
+	dbg_gen("create volume table (copy #%d)", copy + 1);
 
 	vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
 	if (!vid_hdr)
@@ -562,8 +562,8 @@ static int init_volumes(struct ubi_device *ubi,
 		if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
 			/* Auto re-size flag may be set only for one volume */
 			if (ubi->autoresize_vol_id != -1) {
-				ubi_err("more than one auto-resize volume (%d "
-					"and %d)", ubi->autoresize_vol_id, i);
+				ubi_err("more than one auto-resize volume (%d and %d)",
+					ubi->autoresize_vol_id, i);
 				kfree(vol);
 				return -EINVAL;
 			}

drivers/mtd/ubi/wl.c

@@ -978,9 +978,10 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
 			int cancel)
 {
 	struct ubi_wl_entry *e = wl_wrk->e;
-	int pnum = e->pnum, err, need;
+	int pnum = e->pnum;
 	int vol_id = wl_wrk->vol_id;
 	int lnum = wl_wrk->lnum;
+	int err, available_consumed = 0;
 
 	if (cancel) {
 		dbg_wl("cancel erasure of PEB %d EC %d", pnum, e->ec);
@@ -1045,21 +1046,15 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
 	}
 
 	spin_lock(&ubi->volumes_lock);
-	need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs + 1;
-	if (need > 0) {
-		need = ubi->avail_pebs >= need ? need : ubi->avail_pebs;
-		ubi->avail_pebs -= need;
-		ubi->rsvd_pebs += need;
-		ubi->beb_rsvd_pebs += need;
-		if (need > 0)
-			ubi_msg("reserve more %d PEBs", need);
-	}
-
 	if (ubi->beb_rsvd_pebs == 0) {
+		if (ubi->avail_pebs == 0) {
 			spin_unlock(&ubi->volumes_lock);
-		ubi_err("no reserved physical eraseblocks");
+			ubi_err("no reserved/available physical eraseblocks");
 			goto out_ro;
 		}
+		ubi->avail_pebs -= 1;
+		available_consumed = 1;
+	}
 	spin_unlock(&ubi->volumes_lock);
 
 	ubi_msg("mark PEB %d as bad", pnum);
@@ -1068,19 +1063,36 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
 		goto out_ro;
 
 	spin_lock(&ubi->volumes_lock);
+	if (ubi->beb_rsvd_pebs > 0) {
+		if (available_consumed) {
+			/*
+			 * The amount of reserved PEBs increased since we last
+			 * checked.
+			 */
+			ubi->avail_pebs += 1;
+			available_consumed = 0;
+		}
 		ubi->beb_rsvd_pebs -= 1;
+	}
 	ubi->bad_peb_count += 1;
 	ubi->good_peb_count -= 1;
 	ubi_calculate_reserved(ubi);
-	if (ubi->beb_rsvd_pebs)
+	if (available_consumed)
+		ubi_warn("no PEBs in the reserved pool, used an available PEB");
+	else if (ubi->beb_rsvd_pebs)
 		ubi_msg("%d PEBs left in the reserve", ubi->beb_rsvd_pebs);
 	else
-		ubi_warn("last PEB from the reserved pool was used");
+		ubi_warn("last PEB from the reserve was used");
 	spin_unlock(&ubi->volumes_lock);
 
 	return err;
 
 out_ro:
+	if (available_consumed) {
+		spin_lock(&ubi->volumes_lock);
+		ubi->avail_pebs += 1;
+		spin_unlock(&ubi->volumes_lock);
+	}
 	ubi_ro_mode(ubi);
 	return err;
 }
@@ -1189,7 +1201,7 @@ int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum)
 {
 	struct ubi_wl_entry *e;
 
-	dbg_msg("schedule PEB %d for scrubbing", pnum);
+	ubi_msg("schedule PEB %d for scrubbing", pnum);
 
 retry:
 	spin_lock(&ubi->wl_lock);

include/linux/mtd/partitions.h

@@ -79,9 +79,10 @@ struct mtd_part_parser {
 extern int register_mtd_parser(struct mtd_part_parser *parser);
 extern int deregister_mtd_parser(struct mtd_part_parser *parser);
 
-int mtd_is_partition(struct mtd_info *mtd);
+int mtd_is_partition(const struct mtd_info *mtd);
 int mtd_add_partition(struct mtd_info *master, char *name,
 		      long long offset, long long length);
 int mtd_del_partition(struct mtd_info *master, int partno);
+uint64_t mtd_get_device_size(const struct mtd_info *mtd);
 
 #endif

include/mtd/ubi-user.h

@@ -222,6 +222,7 @@ enum {
  * @ubi_num: UBI device number to create
  * @mtd_num: MTD device number to attach
  * @vid_hdr_offset: VID header offset (use defaults if %0)
+ * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
  * @padding: reserved for future, not used, has to be zeroed
  *
  * This data structure is used to specify MTD device UBI has to attach and the
@@ -245,12 +246,25 @@ enum {
  * be 2KiB-64 bytes = 1984. Note, that this position is not even 512-bytes
  * aligned, which is OK, as UBI is clever enough to realize this is 4th
  * sub-page of the first page and add needed padding.
+ *
+ * The @max_beb_per1024 is the maximum amount of bad PEBs UBI expects on the
+ * UBI device per 1024 eraseblocks.  This value is often given in an other form
+ * in the NAND datasheet (min NVB i.e. minimal number of valid blocks). The
+ * maximum expected bad eraseblocks per 1024 is then:
+ *    1024 * (1 - MinNVB / MaxNVB)
+ * Which gives 20 for most NAND devices.  This limit is used in order to derive
+ * amount of eraseblock UBI reserves for handling new bad blocks. If the device
+ * has more bad eraseblocks than this limit, UBI does not reserve any physical
+ * eraseblocks for new bad eraseblocks, but attempts to use available
+ * eraseblocks (if any). The accepted range is 0-768. If 0 is given, the
+ * default kernel value of %CONFIG_MTD_UBI_BEB_LIMIT will be used.
  */
 struct ubi_attach_req {
 	__s32 ubi_num;
 	__s32 mtd_num;
 	__s32 vid_hdr_offset;
-	__s8 padding[12];
+	__s16 max_beb_per1024;
+	__s8 padding[10];
 };
 
 /**