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    Subject[PATCH 05/22 take 3] UBI: startup code
    diff -auNrp tmp-from/drivers/mtd/ubi/build.c tmp-to/drivers/mtd/ubi/build.c
    --- tmp-from/drivers/mtd/ubi/build.c 1970-01-01 02:00:00.000000000 +0200
    +++ tmp-to/drivers/mtd/ubi/build.c 2007-03-14 17:15:50.000000000 +0200
    @@ -0,0 +1,467 @@
    +/*
    + * Copyright (c) International Business Machines Corp., 2006
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
    + * the GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    + *
    + * Author: Artem B. Bityutskiy,
    + * Frank Haverkamp
    + */
    +
    +/*
    + * UBI build unit.
    + *
    + * This unit is responsible for UBI initialization and for building UBI
    + * devices. At the moment UBI only one build method - scanning. But in futire
    + * we may add on-flash EBA table support and implement better build method.
    + */
    +
    +#include <linux/err.h>
    +#include <linux/module.h>
    +#include <linux/moduleparam.h>
    +#include <linux/stringify.h>
    +#include <linux/stat.h>
    +#include "ubi.h"
    +
    +/* Maximum MTD device specification parameter length */
    +#define UBI_MTD_PARAM_LEN_MAX 64
    +
    +/**
    + * struct mtd_dev_param - MTD device parameter description data structure.
    + *
    + * @name: MTD device name or number string
    + * @vid_hdr_offs: VID header offset
    + * @data_offs: data offset
    + */
    +struct mtd_dev_param
    +{
    + char name[UBI_MTD_PARAM_LEN_MAX];
    + int vid_hdr_offs;
    + int data_offs;
    +};
    +
    +/* Numbers of elements set in the @mtd_dev_param array. */
    +static int mtd_devs = 0;
    +
    +/* MTD devices specification parameters */
    +static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES];
    +
    +/* Number of UBI devices in system */
    +int ubis_num;
    +
    +/* All the UBI devices in system */
    +struct ubi_info *ubis[UBI_MAX_DEVICES];
    +
    +/**
    + * attach_by_scanning - attach a MTD device using scanning method.
    + *
    + * @ubi: UBI device descriptor
    + *
    + * This function returns zero in case of success and a negative error code in
    + * case of failure.
    + *
    + * Note, currently this is the only method to attach UBI devices. Hopefully in
    + * the future we'll have more scalable attaching methods and avoid full media
    + * scanning. In this case scanning could be used as a fall-back attaching
    + * method.
    + */
    +static int attach_by_scanning(struct ubi_info *ubi)
    +{
    + int err;
    + struct ubi_scan_info *si;
    +
    + dbg_bld("attach mtd device by scanning");
    +
    + si = ubi_scan(ubi);
    + if (IS_ERR(si))
    + return PTR_ERR(si);
    +
    + err = ubi_vtbl_init_scan(ubi, si);
    + if (err)
    + goto out_si;
    +
    + err = ubi_acc_init_scan(ubi, si);
    + if (err)
    + goto out_vtbl;
    +
    + err = ubi_wl_init_scan(ubi, si);
    + if (err)
    + goto out_vtbl;
    +
    + err = ubi_eba_init_scan(ubi, si);
    + if (err)
    + goto out_wl;
    +
    + ubi_msg("mean erase counter: %d", si->mean_ec);
    + ubi_scan_destroy_si(si);
    + return 0;
    +
    +out_wl:
    + ubi_wl_close(ubi);
    +out_vtbl:
    + ubi_vtbl_close(ubi);
    +out_si:
    + ubi_scan_destroy_si(si);
    + return err;
    +}
    +
    +/**
    + * detach_mtd_dev - detach an MTD device.
    + *
    + * @ubi: the UBI device description object
    + */
    +static void detach_mtd_dev(struct ubi_info *ubi)
    +{
    + int mtd_num = ubi->io.mtd_num, ubi_num = ubi->ubi_num;
    +
    + dbg_bld("detaching mtd%d from ubi%d", mtd_num, ubi_num);
    +
    + ubi_uif_close(ubi);
    + ubi_eba_close(ubi);
    + ubi_wl_close(ubi);
    + ubi_vtbl_close(ubi);
    + ubi_io_close(ubi);
    + kfree(ubis[ubi_num]);
    + ubis[ubi_num] = NULL;
    + ubis_num -= 1;
    + ubi_assert(ubis_num >= 0);
    +
    + ubi_msg("detached mtd%d from ubi%d", mtd_num, ubi_num);
    +}
    +
    +/**
    + * attach_mtd_dev - attach an MTD device.
    + *
    + * @mtd_dev: MTD device name or number string to attach
    + * @vid_hdr_offset: volume identifier header offset in physical eraseblocks
    + * @data_offset: data offset in physical eraseblock
    + *
    + * This function attaches an MTD device to UBI. It first treats @mtd_dev as the
    + * MTD device name, and tries to open it by this name. If it is unable to open,
    + * it tries to convert @mtd_dev to an integer and open the MTD device by its
    + * number. Returns zero in case of success and a negative error code in case of
    + * failure.
    + */
    +static int attach_mtd_dev(const char *mtd_dev, int vid_hdr_offset,
    + int data_offset)
    +{
    + struct mtd_info *mtd;
    + int i, err, mtd_num, ubi_num = ubis_num;
    + struct ubi_info *ubi;
    +
    + if (ubis_num == UBI_MAX_DEVICES) {
    + ubi_err("too many UBI devices, max. is %d", UBI_MAX_DEVICES);
    + return -EINVAL;
    + }
    +
    + mtd = get_mtd_device_nm(mtd_dev);
    + if (IS_ERR(mtd)) {
    + char *endp;
    +
    + if (PTR_ERR(mtd) != -ENODEV)
    + return PTR_ERR(mtd);
    +
    + /*
    + * Probably this is not MTD device name but MTD device number -
    + * check it out.
    + */
    + mtd_num = simple_strtoul(mtd_dev, &endp, 0);
    + if (*endp != '\0' || mtd_dev == endp) {
    + ubi_err("incorrect MTD device: \"%s\"", mtd_dev);
    + return -ENODEV;
    + }
    +
    + mtd = get_mtd_device(NULL, mtd_num);
    + if (IS_ERR(mtd))
    + return PTR_ERR(mtd);
    + }
    +
    + mtd_num = mtd->index;
    +
    + /*
    + * Ok, now we know MTD device number. Close it and let I/O unit to deal
    + * with it later.
    + */
    + put_mtd_device(mtd);
    +
    + /* Check if we already have the same MTD device attached */
    + for (i = 0; i < ubis_num; i++)
    + if (ubis[i]->io.mtd_num == mtd_num) {
    + ubi_err("mtd%d is already attached to ubi%d",
    + mtd_num, i);
    + return -EINVAL;
    + }
    +
    + ubi = ubis[ubi_num] = kzalloc(sizeof(struct ubi_info), GFP_KERNEL);
    + if (!ubis[ubi_num])
    + return -ENOMEM;
    +
    + ubi->ubi_num = ubi_num;
    +
    + dbg_bld("attaching mtd%d to ubi%d", mtd_num, ubi_num);
    +
    + err = ubi_io_init(ubi, mtd_num, vid_hdr_offset, data_offset);
    + if (err) {
    + dbg_err("failed to initialize I/O unit, error %d", err);
    + goto out_free;
    + }
    +
    + err = attach_by_scanning(ubi);
    + if (err) {
    + dbg_err("failed to attach MTD device, error %d", err);
    + goto out_io;
    + }
    +
    + err = ubi_uif_init(ubi);
    + if (err) {
    + dbg_err("failed to initialize user interfaces unit, error %d",
    + err);
    + goto out_detach;
    + }
    +
    + ubis_num += 1;
    +
    + ubi_msg("attached mtd%d to ubi%d", mtd_num, ubi_num);
    + ubi_msg("MTD device name: \"%s\"", ubi->io.mtd_name);
    + ubi_msg("MTD device size: %llu MiB",
    + ubi->io.flash_size >> 20);
    + ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
    + ubi->io.peb_size, ubi->io.peb_size >> 10);
    + ubi_msg("logical eraseblock size: %d bytes", ubi->io.leb_size);
    + ubi_msg("number of good PEBs: %d", ubi->io.good_peb_count);
    + ubi_msg("number of bad PEBs: %d", ubi->io.bad_peb_count);
    + ubi_msg("smallest flash I/O unit: %d", ubi->io.min_io_size);
    + ubi_msg("VID header offset: %d (aligned %d)",
    + ubi->io.vid_hdr_offset, ubi->io.vid_hdr_aloffset);
    + ubi_msg("data offset: %d", ubi->io.leb_start);
    + ubi_msg("max. allowed volumes: %d", ubi->vtbl.vt_slots);
    + ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD);
    + ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
    + ubi_msg("number of user volumes: %d", ubi->vtbl.vol_count);
    + ubi_msg("available PEBs: %d", ubi->acc.avail_pebs);
    + ubi_msg("total number of reserved PEBs: %d", ubi->acc.rsvd_pebs);
    + ubi_msg("number of PEBs reserved for bad PEB handling: %d",
    + ubi->acc.beb_rsvd_pebs);
    +
    + ubi_wl_enable_thread(ubi);
    +
    + return 0;
    +
    +out_detach:
    + ubi_eba_close(ubi);
    + ubi_wl_close(ubi);
    + ubi_vtbl_close(ubi);
    +out_io:
    + ubi_io_close(ubi);
    +out_free:
    + kfree(ubi);
    + ubis[ubi_num] = NULL;
    + return err;
    +}
    +
    +static int __init ubi_init(void)
    +{
    + int err, i, k;
    +
    + if (mtd_devs > UBI_MAX_DEVICES) {
    + printk("UBI error: too many MTD devices, max. is %d\n",
    + UBI_MAX_DEVICES);
    + return -EINVAL;
    + }
    +
    + err = ubi_dbg_init();
    + if (err) {
    + printk("UBI error: failed to initialize debugging unit, "
    + "error %d", err);
    + return err;
    + }
    +
    + err = ubi_sysfs_infr_init();
    + if (err) {
    + ubi_err("failed to initialize sysfs infrastructure, error %d",
    + err);
    + goto out_dbg;
    + }
    +
    + /* Attach MTD devices */
    + for (i = 0; i < mtd_devs; i++) {
    + struct mtd_dev_param *p = &mtd_dev_param[i];
    +
    + cond_resched();
    +
    + if (!p->name) {
    + dbg_err("empty name");
    + err = -EINVAL;
    + goto out_detach;
    + }
    +
    + err = attach_mtd_dev(p->name, p->vid_hdr_offs, p->data_offs);
    + if (err)
    + goto out_detach;
    + }
    +
    + return 0;
    +
    +out_detach:
    + for (k = 0; k < i; k++)
    + detach_mtd_dev(ubis[k]);
    + ubi_sysfs_infr_close();
    +out_dbg:
    + ubi_dbg_close();
    + return err;
    +}
    +module_init(ubi_init);
    +
    +static void __exit ubi_exit(void)
    +{
    + int i, n = ubis_num;
    +
    + for (i = 0; i < n; i++)
    + detach_mtd_dev(ubis[i]);
    + ubi_sysfs_infr_close();
    + ubi_dbg_close();
    +}
    +module_exit(ubi_exit);
    +
    +/*
    + * bytes_str_to_int - convert a string representing a number of bytes to an
    + * integer.
    + *
    + * @str: the string to convert
    + *
    + * This function returns positive resulting integer in case of success and a
    + * negative error code in case of failure.
    + */
    +static int __init bytes_str_to_int(const char *str)
    +{
    + char *endp;
    + unsigned long result;
    +
    + result = simple_strtoul(str, &endp, 0);
    + if (str == endp || result < 0) {
    + printk("UBI error: incorrect bytes count: \"%s\"\n", str);
    + return -EINVAL;
    + }
    +
    + switch (*endp) {
    + case 'G':
    + result *= 1024;
    + case 'M':
    + result *= 1024;
    + case 'K':
    + case 'k':
    + result *= 1024;
    + if (endp[1] == 'i' && (endp[2] == '\0' ||
    + endp[2] == 'B' || endp[2] == 'b'))
    + endp += 2;
    + case '\0':
    + break;
    + default:
    + printk("UBI error: incorrect bytes count: \"%s\"\n", str);
    + return -EINVAL;
    + }
    +
    + return result;
    +}
    +
    +/**
    + * ubi_mtd_param_parse - parse the "mtd" UBI parameter.
    + *
    + * @val: the parameter value to parse
    + * @kp: not used
    + *
    + * This function returns zero in case of success and a negative error code in
    + * case of error.
    + */
    +static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
    +{
    + int i, len;
    + struct mtd_dev_param *p;
    + char buf[UBI_MTD_PARAM_LEN_MAX];
    + char *pbuf = &buf[0];
    + char *tokens[3] = {NULL, NULL, NULL};
    +
    + /* Ensure EC and VID headers have correct size */
    + BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
    + BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
    +
    + if (mtd_devs == UBI_MAX_DEVICES) {
    + printk("UBI error: too many parameters, max. is %d\n",
    + UBI_MAX_DEVICES);
    + return -EINVAL;
    + }
    +
    + len = strnlen(val, UBI_MTD_PARAM_LEN_MAX);
    + if (len == UBI_MTD_PARAM_LEN_MAX) {
    + printk("UBI error: parameter \"%s\" is too long, max. is %d\n",
    + val, UBI_MTD_PARAM_LEN_MAX);
    + return -EINVAL;
    + }
    +
    + if (len == 0) {
    + printk("UBI warning: empty \"mtd\" parameter - ignored\n");
    + return 0;
    + }
    +
    + strcpy(buf, val);
    +
    + /* Get rid of the final newline */
    + if (buf[len - 1] == '\n')
    + buf[len - 1] = 0;
    +
    + for (i = 0; i < 3; i++)
    + tokens[i] = strsep(&pbuf, ",");
    +
    + if (pbuf) {
    + printk("UBI error: too many arguments at \"%s\"\n", val);
    + return -EINVAL;
    + }
    +
    + if (tokens[0] == '\0')
    + return -EINVAL;
    +
    + p = &mtd_dev_param[mtd_devs];
    + strcpy(&p->name[0], tokens[0]);
    +
    + if (tokens[1])
    + p->vid_hdr_offs = bytes_str_to_int(tokens[1]);
    + if (tokens[2])
    + p->data_offs = bytes_str_to_int(tokens[2]);
    +
    + if (p->vid_hdr_offs < 0)
    + return p->vid_hdr_offs;
    + if (p->data_offs < 0)
    + return p->data_offs;
    +
    + 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>[,<vid_hdr_offs>,<data_offs>]. "
    + "Multiple \"mtd\" parameters may be specified.\n"
    + "MTD devices may be specified by their number or name. "
    + "Optional \"vid_hdr_offs\" and \"data_offs\" parameters "
    + "specify UBI VID header position and data starting "
    + "position to be used by UBI.\n"
    + "Example: mtd=content,1984,2048 mtd=4 - attach MTD device"
    + "with name content using VID header offset 1984 and data "
    + "start 2048, and MTD device number 4 using default "
    + "offsets");
    +
    +MODULE_VERSION(__stringify(UBI_VERSION));
    +MODULE_DESCRIPTION("UBI - Unsorted Block Images");
    +MODULE_AUTHOR("Artem B. Bityutskiy");
    +MODULE_LICENSE("GPL");
    -
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      Last update: 2007-03-14 16:27    [W:0.067 / U:90.120 seconds]
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