#include <linux/namei.h>
#include <linux/stat.h>
#include <linux/miscdevice.h>
+#include <linux/mtd/partitions.h>
#include <linux/log2.h>
#include <linux/kthread.h>
#include <linux/kernel.h>
/* Maximum length of the 'mtd=' parameter */
#define MTD_PARAM_LEN_MAX 64
+/* Maximum number of comma-separated items in the 'mtd=' parameter */
+#define MTD_PARAM_MAX_COUNT 3
+
+/* Maximum value for the number of bad PEBs per 1024 PEBs */
+#define MAX_MTD_UBI_BEB_LIMIT 768
+
#ifdef CONFIG_MTD_UBI_MODULE
#define ubi_is_module() 1
#else
* @name: MTD character device node path, MTD device name, or MTD device number
* string
* @vid_hdr_offs: VID header offset
+ * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs
*/
struct mtd_dev_param {
char name[MTD_PARAM_LEN_MAX];
int vid_hdr_offs;
+ int max_beb_per1024;
};
/* Numbers of elements set in the @mtd_dev_param array */
}
}
+static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
+{
+ int limit, device_pebs;
+ uint64_t device_size;
+
+ if (!max_beb_per1024)
+ return 0;
+
+ /*
+ * Here we are using size of the entire flash chip and
+ * not just the MTD partition size because the maximum
+ * number of bad eraseblocks is a percentage of the
+ * whole device and bad eraseblocks are not fairly
+ * distributed over the flash chip. So the worst case
+ * is that all the bad eraseblocks of the chip are in
+ * the MTD partition we are attaching (ubi->mtd).
+ */
+ device_size = mtd_get_device_size(ubi->mtd);
+ device_pebs = mtd_div_by_eb(device_size, ubi->mtd);
+ limit = mult_frac(device_pebs, max_beb_per1024, 1024);
+
+ /* Round it up */
+ if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs)
+ limit += 1;
+
+ return limit;
+}
+
/**
* io_init - initialize I/O sub-system for a given UBI device.
* @ubi: UBI device description object
+ * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
*
* If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
* assumed:
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
-static int io_init(struct ubi_device *ubi)
+static int io_init(struct ubi_device *ubi, int max_beb_per1024)
{
if (ubi->mtd->numeraseregions != 0) {
/*
ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd);
ubi->flash_size = ubi->mtd->size;
- if (mtd_can_have_bb(ubi->mtd))
+ if (mtd_can_have_bb(ubi->mtd)) {
ubi->bad_allowed = 1;
+ ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024);
+ }
if (ubi->mtd->type == MTD_NORFLASH) {
ubi_assert(ubi->mtd->writesize == 1);
struct ubi_volume *vol = ubi->volumes[vol_id];
int err, old_reserved_pebs = vol->reserved_pebs;
+ if (ubi->ro_mode) {
+ ubi_warn("skip auto-resize because of R/O mode");
+ return 0;
+ }
+
/*
* Clear the auto-resize flag in the volume in-memory copy of the
* volume table, and 'ubi_resize_volume()' will propagate this change
* @mtd: MTD device description object
* @ubi_num: number to assign to the new UBI device
* @vid_hdr_offset: VID header offset
+ * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
*
* This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
* to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
* Note, the invocations of this function has to be serialized by the
* @ubi_devices_mutex.
*/
-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)
{
struct ubi_device *ubi;
int i, err, ref = 0;
+ if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT)
+ return -EINVAL;
+
+ if (!max_beb_per1024)
+ max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT;
+
/*
* Check if we already have the same MTD device attached.
*
dbg_msg("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb));
dbg_msg("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
- err = io_init(ubi);
+ err = io_init(ubi, max_beb_per1024);
if (err)
goto out_free;
ubi_msg("number of PEBs reserved for bad PEB handling: %d",
ubi->beb_rsvd_pebs);
ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
- ubi_msg("image sequence number: %d", ubi->image_seq);
+ ubi_msg("image sequence number: %u", ubi->image_seq);
/*
* The below lock makes sure we do not race with 'ubi_thread()' which
mutex_lock(&ubi_devices_mutex);
err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO,
- p->vid_hdr_offs);
+ p->vid_hdr_offs, p->max_beb_per1024);
mutex_unlock(&ubi_devices_mutex);
if (err < 0) {
ubi_err("cannot attach mtd%d", mtd->index);
struct mtd_dev_param *p;
char buf[MTD_PARAM_LEN_MAX];
char *pbuf = &buf[0];
- char *tokens[2] = {NULL, NULL};
+ char *tokens[MTD_PARAM_MAX_COUNT];
if (!val)
return -EINVAL;
if (buf[len - 1] == '\n')
buf[len - 1] = '\0';
- for (i = 0; i < 2; i++)
+ for (i = 0; i < MTD_PARAM_MAX_COUNT; i++)
tokens[i] = strsep(&pbuf, ",");
if (pbuf) {
if (p->vid_hdr_offs < 0)
return p->vid_hdr_offs;
+ if (tokens[2]) {
+ int err = kstrtoint(tokens[2], 10, &p->max_beb_per1024);
+
+ if (err) {
+ printk(KERN_ERR "UBI error: bad value for "
+ "max_beb_per1024 parameter: %s", tokens[2]);
+ return -EINVAL;
+ }
+ }
+
mtd_devs += 1;
return 0;
}
module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
-MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: "
- "mtd=<name|num|path>[,<vid_hdr_offs>].\n"
+MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]].\n"
"Multiple \"mtd\" parameters may be specified.\n"
- "MTD devices may be specified by their number, name, or "
- "path to the MTD character device node.\n"
- "Optional \"vid_hdr_offs\" parameter specifies UBI VID "
- "header position to be used by UBI.\n"
- "Example 1: mtd=/dev/mtd0 - attach MTD device "
- "/dev/mtd0.\n"
- "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.");
+ "MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
+ "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
+ "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
+ __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n"
+ "\n"
+ "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
+ "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"
+ "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"
+ "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
MODULE_VERSION(__stringify(UBI_VERSION));
MODULE_DESCRIPTION("UBI - Unsorted Block Images");
git.openpandora.org / pandora-kernel.git / blobdiff