blob: bad77daf61eb546747bf18d401710a6b35f52b44 [file] [log] [blame]
/*
* Simple MTD partitioning layer
*
* Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
* Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
* Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
* Copyright (c) 2013 The Linux Foundation. All rights reserved.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kmod.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/root_dev.h>
#include <linux/magic.h>
#include <linux/err.h>
#include "mtdcore.h"
static bool rootfs_split = 1;
#define MTD_ERASE_PARTIAL 0x8000 /* partition only covers parts of an erase block */
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
static DEFINE_MUTEX(mtd_partitions_mutex);
/* Our partition node structure */
struct mtd_part {
struct mtd_info mtd;
struct mtd_info *master;
uint64_t offset;
struct list_head list;
};
/*
* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
* the pointer to that structure with this macro.
*/
#define PART(x) ((struct mtd_part *)(x))
#define IS_PART(mtd) (mtd->read == part_read)
/*
* MTD methods which simply translate the effective address and pass through
* to the _real_ device.
*/
static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_part *part = PART(mtd);
struct mtd_ecc_stats stats;
int res;
stats = part->master->ecc_stats;
if (from >= mtd->size)
len = 0;
else if (from + len > mtd->size)
len = mtd->size - from;
res = mtd_read(part->master, from + part->offset, len, retlen, buf);
if (unlikely(res)) {
if (mtd_is_bitflip(res))
mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
if (mtd_is_eccerr(res))
mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
}
return res;
}
static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void **virt, resource_size_t *phys)
{
struct mtd_part *part = PART(mtd);
if (from >= mtd->size)
len = 0;
else if (from + len > mtd->size)
len = mtd->size - from;
return mtd_point(part->master, from + part->offset, len, retlen,
virt, phys);
}
static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
struct mtd_part *part = PART(mtd);
mtd_unpoint(part->master, from + part->offset, len);
}
static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
unsigned long len,
unsigned long offset,
unsigned long flags)
{
struct mtd_part *part = PART(mtd);
offset += part->offset;
return mtd_get_unmapped_area(part->master, len, offset, flags);
}
static int part_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
struct mtd_part *part = PART(mtd);
int res;
if (from >= mtd->size)
return -EINVAL;
if (ops->datbuf && from + ops->len > mtd->size)
return -EINVAL;
/*
* If OOB is also requested, make sure that we do not read past the end
* of this partition.
*/
if (ops->oobbuf) {
size_t len, pages;
if (ops->mode == MTD_OPS_AUTO_OOB)
len = mtd->oobavail;
else
len = mtd->oobsize;
pages = mtd_div_by_ws(mtd->size, mtd);
pages -= mtd_div_by_ws(from, mtd);
if (ops->ooboffs + ops->ooblen > pages * len)
return -EINVAL;
}
res = mtd_read_oob(part->master, from + part->offset, ops);
if (unlikely(res)) {
if (mtd_is_bitflip(res))
mtd->ecc_stats.corrected++;
if (mtd_is_eccerr(res))
mtd->ecc_stats.failed++;
}
return res;
}
static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen, u_char *buf)
{
struct mtd_part *part = PART(mtd);
return mtd_read_user_prot_reg(part->master, from, len, retlen, buf);
}
static int part_get_user_prot_info(struct mtd_info *mtd,
struct otp_info *buf, size_t len)
{
struct mtd_part *part = PART(mtd);
return mtd_get_user_prot_info(part->master, buf, len);
}
static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen, u_char *buf)
{
struct mtd_part *part = PART(mtd);
return mtd_read_fact_prot_reg(part->master, from, len, retlen, buf);
}
static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
size_t len)
{
struct mtd_part *part = PART(mtd);
return mtd_get_fact_prot_info(part->master, buf, len);
}
static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct mtd_part *part = PART(mtd);
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (to >= mtd->size)
len = 0;
else if (to + len > mtd->size)
len = mtd->size - to;
return mtd_write(part->master, to + part->offset, len, retlen, buf);
}
static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct mtd_part *part = PART(mtd);
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (to >= mtd->size)
len = 0;
else if (to + len > mtd->size)
len = mtd->size - to;
return mtd_panic_write(part->master, to + part->offset, len, retlen,
buf);
}
static int part_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
struct mtd_part *part = PART(mtd);
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (to >= mtd->size)
return -EINVAL;
if (ops->datbuf && to + ops->len > mtd->size)
return -EINVAL;
return mtd_write_oob(part->master, to + part->offset, ops);
}
static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen, u_char *buf)
{
struct mtd_part *part = PART(mtd);
return mtd_write_user_prot_reg(part->master, from, len, retlen, buf);
}
static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len)
{
struct mtd_part *part = PART(mtd);
return mtd_lock_user_prot_reg(part->master, from, len);
}
static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
struct mtd_part *part = PART(mtd);
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
return mtd_writev(part->master, vecs, count, to + part->offset,
retlen);
}
static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct mtd_part *part = PART(mtd);
int ret;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (instr->addr >= mtd->size)
return -EINVAL;
instr->partial_start = false;
if (mtd->flags & MTD_ERASE_PARTIAL) {
size_t readlen = 0;
u64 mtd_ofs;
instr->erase_buf = kmalloc(part->master->erasesize, GFP_ATOMIC);
if (!instr->erase_buf)
return -ENOMEM;
mtd_ofs = part->offset + instr->addr;
instr->erase_buf_ofs = do_div(mtd_ofs, part->master->erasesize);
if (instr->erase_buf_ofs > 0) {
instr->addr -= instr->erase_buf_ofs;
ret = mtd_read(part->master,
instr->addr + part->offset,
part->master->erasesize,
&readlen, instr->erase_buf);
instr->partial_start = true;
} else {
mtd_ofs = part->offset + part->mtd.size;
instr->erase_buf_ofs = part->master->erasesize -
do_div(mtd_ofs, part->master->erasesize);
if (instr->erase_buf_ofs > 0) {
instr->len += instr->erase_buf_ofs;
ret = mtd_read(part->master,
part->offset + instr->addr +
instr->len - part->master->erasesize,
part->master->erasesize, &readlen,
instr->erase_buf);
} else {
ret = 0;
}
}
if (ret < 0) {
kfree(instr->erase_buf);
return ret;
}
}
instr->addr += part->offset;
ret = mtd_erase(part->master, instr);
if (ret) {
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
if (mtd->flags & MTD_ERASE_PARTIAL)
kfree(instr->erase_buf);
}
return ret;
}
void mtd_erase_callback(struct erase_info *instr)
{
if (instr->mtd->erase == part_erase) {
struct mtd_part *part = PART(instr->mtd);
size_t wrlen = 0;
if (instr->mtd->flags & MTD_ERASE_PARTIAL) {
if (instr->partial_start) {
part->master->write(part->master,
instr->addr, instr->erase_buf_ofs,
&wrlen, instr->erase_buf);
instr->addr += instr->erase_buf_ofs;
} else {
instr->len -= instr->erase_buf_ofs;
part->master->write(part->master,
instr->addr + instr->len,
instr->erase_buf_ofs, &wrlen,
instr->erase_buf +
part->master->erasesize -
instr->erase_buf_ofs);
}
kfree(instr->erase_buf);
}
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
}
if (instr->callback)
instr->callback(instr);
}
EXPORT_SYMBOL_GPL(mtd_erase_callback);
static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
if ((len + ofs) > mtd->size)
return -EINVAL;
return mtd_lock(part->master, ofs + part->offset, len);
}
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
if ((len + ofs) > mtd->size)
return -EINVAL;
ofs += part->offset;
if (mtd->flags & MTD_ERASE_PARTIAL) {
/* round up len to next erasesize and round down offset to prev block */
len = (mtd_div_by_eb(len, part->master) + 1) * part->master->erasesize;
ofs &= ~(part->master->erasesize - 1);
}
return mtd_unlock(part->master, ofs, len);
}
static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
if ((len + ofs) > mtd->size)
return -EINVAL;
return mtd_is_locked(part->master, ofs + part->offset, len);
}
static void part_sync(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
mtd_sync(part->master);
}
static int part_suspend(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
return mtd_suspend(part->master);
}
static void part_resume(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
mtd_resume(part->master);
}
static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
if (ofs >= mtd->size)
return -EINVAL;
ofs += part->offset;
return mtd_block_isbad(part->master, ofs);
}
static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
int res;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (ofs >= mtd->size)
return -EINVAL;
ofs += part->offset;
res = mtd_block_markbad(part->master, ofs);
if (!res)
mtd->ecc_stats.badblocks++;
return res;
}
static inline void free_partition(struct mtd_part *p)
{
kfree(p->mtd.name);
kfree(p);
}
/*
* This function unregisters and destroy all slave MTD objects which are
* attached to the given master MTD object.
*/
int del_mtd_partitions(struct mtd_info *master)
{
struct mtd_part *slave, *next;
int ret, err = 0;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
if (slave->master == master) {
ret = del_mtd_device(&slave->mtd);
if (ret < 0) {
err = ret;
continue;
}
list_del(&slave->list);
free_partition(slave);
}
mutex_unlock(&mtd_partitions_mutex);
return err;
}
static struct mtd_part *allocate_partition(struct mtd_info *master,
const struct mtd_partition *part, int partno,
uint64_t cur_offset)
{
struct mtd_part *slave;
char *name;
/* allocate the partition structure */
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
name = kstrdup(part->name, GFP_KERNEL);
if (!name || !slave) {
printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
master->name);
kfree(name);
kfree(slave);
return ERR_PTR(-ENOMEM);
}
/* set up the MTD object for this partition */
slave->mtd.type = master->type;
slave->mtd.flags = master->flags & ~part->mask_flags;
slave->mtd.size = part->size;
slave->mtd.writesize = master->writesize;
slave->mtd.writebufsize = master->writebufsize;
slave->mtd.oobsize = master->oobsize;
slave->mtd.oobavail = master->oobavail;
slave->mtd.subpage_sft = master->subpage_sft;
slave->mtd.name = name;
slave->mtd.owner = master->owner;
slave->mtd.backing_dev_info = master->backing_dev_info;
/* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
* to have the same data be in two different partitions.
*/
slave->mtd.dev.parent = master->dev.parent;
slave->mtd.read = part_read;
slave->mtd.write = part_write;
if (master->panic_write)
slave->mtd.panic_write = part_panic_write;
if (master->point && master->unpoint) {
slave->mtd.point = part_point;
slave->mtd.unpoint = part_unpoint;
}
if (master->get_unmapped_area)
slave->mtd.get_unmapped_area = part_get_unmapped_area;
if (master->read_oob)
slave->mtd.read_oob = part_read_oob;
if (master->write_oob)
slave->mtd.write_oob = part_write_oob;
if (master->read_user_prot_reg)
slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
if (master->read_fact_prot_reg)
slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
if (master->write_user_prot_reg)
slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
if (master->lock_user_prot_reg)
slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
if (master->get_user_prot_info)
slave->mtd.get_user_prot_info = part_get_user_prot_info;
if (master->get_fact_prot_info)
slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
if (master->sync)
slave->mtd.sync = part_sync;
if (!partno && !master->dev.class && master->suspend && master->resume) {
slave->mtd.suspend = part_suspend;
slave->mtd.resume = part_resume;
}
if (master->writev)
slave->mtd.writev = part_writev;
if (master->lock)
slave->mtd.lock = part_lock;
if (master->unlock)
slave->mtd.unlock = part_unlock;
if (master->is_locked)
slave->mtd.is_locked = part_is_locked;
if (master->block_isbad)
slave->mtd.block_isbad = part_block_isbad;
if (master->block_markbad)
slave->mtd.block_markbad = part_block_markbad;
slave->mtd.erase = part_erase;
slave->master = master;
slave->offset = part->offset;
if (slave->offset == MTDPART_OFS_APPEND)
slave->offset = cur_offset;
if (slave->offset == MTDPART_OFS_NXTBLK) {
slave->offset = cur_offset;
if (mtd_mod_by_eb(cur_offset, master) != 0) {
/* Round up to next erasesize */
slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
printk(KERN_NOTICE "Moving partition %d: "
"0x%012llx -> 0x%012llx\n", partno,
(unsigned long long)cur_offset, (unsigned long long)slave->offset);
}
}
if (slave->offset == MTDPART_OFS_RETAIN) {
slave->offset = cur_offset;
if (master->size - slave->offset >= slave->mtd.size) {
slave->mtd.size = master->size - slave->offset
- slave->mtd.size;
} else {
printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
part->name, master->size - slave->offset,
slave->mtd.size);
/* register to preserve ordering */
goto out_register;
}
}
if (slave->mtd.size == MTDPART_SIZ_FULL)
slave->mtd.size = master->size - slave->offset;
printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
(unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
/* let's do some sanity checks */
if (slave->offset >= master->size) {
/* let's register it anyway to preserve ordering */
slave->offset = 0;
slave->mtd.size = 0;
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
part->name);
goto out_register;
}
if (slave->offset + slave->mtd.size > master->size) {
slave->mtd.size = master->size - slave->offset;
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
part->name, master->name, (unsigned long long)slave->mtd.size);
}
if (master->numeraseregions > 1) {
/* Deal with variable erase size stuff */
int i, max = master->numeraseregions;
u64 end = slave->offset + slave->mtd.size;
struct mtd_erase_region_info *regions = master->eraseregions;
/* Find the first erase regions which is part of this
* partition. */
for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
;
/* The loop searched for the region _behind_ the first one */
if (i > 0)
i--;
/* Pick biggest erasesize */
for (; i < max && regions[i].offset < end; i++) {
if (slave->mtd.erasesize < regions[i].erasesize) {
slave->mtd.erasesize = regions[i].erasesize;
}
}
BUG_ON(slave->mtd.erasesize == 0);
} else {
/* Single erase size */
slave->mtd.erasesize = master->erasesize;
}
if ((slave->mtd.flags & MTD_WRITEABLE) &&
mtd_mod_by_eb(slave->offset, &slave->mtd)) {
/* Doesn't start on a boundary of major erase size */
slave->mtd.flags |= MTD_ERASE_PARTIAL;
if (((u32) slave->mtd.size) > master->erasesize)
slave->mtd.flags &= ~MTD_WRITEABLE;
else
slave->mtd.erasesize = slave->mtd.size;
}
if ((slave->mtd.flags & MTD_WRITEABLE) &&
mtd_mod_by_eb(slave->offset + slave->mtd.size, &slave->mtd)) {
slave->mtd.flags |= MTD_ERASE_PARTIAL;
if ((u32) slave->mtd.size > master->erasesize)
slave->mtd.flags &= ~MTD_WRITEABLE;
else
slave->mtd.erasesize = slave->mtd.size;
}
if ((slave->mtd.flags & (MTD_ERASE_PARTIAL|MTD_WRITEABLE)) == MTD_ERASE_PARTIAL)
printk(KERN_WARNING"mtd: partition \"%s\" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only\n",
part->name);
slave->mtd.ecclayout = master->ecclayout;
if (master->block_isbad) {
uint64_t offs = 0;
while (offs < slave->mtd.size) {
if (mtd_block_isbad(master, offs + slave->offset))
slave->mtd.ecc_stats.badblocks++;
offs += slave->mtd.erasesize;
}
}
out_register:
return slave;
}
int mtd_add_partition(struct mtd_info *master, char *name,
long long offset, long long length)
{
struct mtd_partition part;
struct mtd_part *p, *new;
uint64_t start, end;
int ret = 0;
/* the direct offset is expected */
if (offset == MTDPART_OFS_APPEND ||
offset == MTDPART_OFS_NXTBLK)
return -EINVAL;
if (length == MTDPART_SIZ_FULL)
length = master->size - offset;
if (length <= 0)
return -EINVAL;
part.name = name;
part.size = length;
part.offset = offset;
part.mask_flags = 0;
part.ecclayout = NULL;
new = allocate_partition(master, &part, -1, offset);
if (IS_ERR(new))
return PTR_ERR(new);
start = offset;
end = offset + length;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry(p, &mtd_partitions, list)
if (p->master == master) {
if ((start >= p->offset) &&
(start < (p->offset + p->mtd.size)))
goto err_inv;
if ((end >= p->offset) &&
(end < (p->offset + p->mtd.size)))
goto err_inv;
}
list_add(&new->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&new->mtd);
return ret;
err_inv:
mutex_unlock(&mtd_partitions_mutex);
free_partition(new);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(mtd_add_partition);
int mtd_del_partition(struct mtd_info *master, int partno)
{
struct mtd_part *slave, *next;
int ret = -EINVAL;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
if ((slave->master == master) &&
(slave->mtd.index == partno)) {
ret = del_mtd_device(&slave->mtd);
if (ret < 0)
break;
list_del(&slave->list);
free_partition(slave);
break;
}
mutex_unlock(&mtd_partitions_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
#ifdef CONFIG_MTD_ROOTFS_SPLIT
#define ROOTFS_SPLIT_NAME "rootfs_data"
#define ROOTFS_REMOVED_NAME "<removed>"
struct squashfs_super_block {
__le32 s_magic;
__le32 pad0[9];
__le64 bytes_used;
};
static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
{
struct squashfs_super_block sb;
int len, ret;
ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb);
if (ret || (len != sizeof(sb))) {
printk(KERN_ALERT "split_squashfs: error occured while reading "
"from \"%s\"\n", master->name);
return -EINVAL;
}
if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
master->name);
*split_offset = 0;
return 0;
}
if (le64_to_cpu((sb.bytes_used)) <= 0) {
printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
master->name);
*split_offset = 0;
return 0;
}
len = (u32) le64_to_cpu(sb.bytes_used);
len += (offset & 0x000fffff);
len += (master->erasesize - 1);
len &= ~(master->erasesize - 1);
len -= (offset & 0x000fffff);
*split_offset = offset + len;
return 0;
}
static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
{
struct mtd_partition *dpart;
struct mtd_part *slave = NULL;
struct mtd_part *spart;
int ret, split_offset = 0;
spart = PART(rpart);
ret = split_squashfs(master, spart->offset, &split_offset);
if (ret)
return ret;
if (split_offset <= 0)
return 0;
dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
if (dpart == NULL) {
printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
ROOTFS_SPLIT_NAME);
return -ENOMEM;
}
memcpy(dpart, part, sizeof(*part));
dpart->name = (unsigned char *)&dpart[1];
strcpy(dpart->name, ROOTFS_SPLIT_NAME);
dpart->size = rpart->size - (split_offset - spart->offset);
dpart->offset = split_offset;
if (dpart == NULL)
return 1;
printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
slave = allocate_partition(master, dpart, 0, split_offset);
if (IS_ERR(slave))
return PTR_ERR(slave);
mutex_lock(&mtd_partitions_mutex);
list_add(&slave->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
rpart->split = &slave->mtd;
return 0;
}
static int refresh_rootfs_split(struct mtd_info *mtd)
{
struct mtd_partition tpart;
struct mtd_part *part;
char *name;
//int index = 0;
int offset, size;
int ret;
part = PART(mtd);
/* check for the new squashfs offset first */
ret = split_squashfs(part->master, part->offset, &offset);
if (ret)
return ret;
if ((offset > 0) && !mtd->split) {
printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
/* if we don't have a rootfs split partition, create a new one */
tpart.name = (char *) mtd->name;
tpart.size = mtd->size;
tpart.offset = part->offset;
return split_rootfs_data(part->master, &part->mtd, &tpart);
} else if ((offset > 0) && mtd->split) {
/* update the offsets of the existing partition */
size = mtd->size + part->offset - offset;
part = PART(mtd->split);
part->offset = offset;
part->mtd.size = size;
printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
__func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
(u32) part->offset, (u32) part->mtd.size);
name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
strcpy(name, ROOTFS_SPLIT_NAME);
part->mtd.name = name;
} else if ((offset <= 0) && mtd->split) {
printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
/* mark existing partition as removed */
part = PART(mtd->split);
name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
strcpy(name, ROOTFS_REMOVED_NAME);
part->mtd.name = name;
part->offset = 0;
part->mtd.size = 0;
}
return 0;
}
#endif /* CONFIG_MTD_ROOTFS_SPLIT */
static int __init no_rootfs_split(char *str)
{
rootfs_split = 0;
return 0;
}
early_param("norootfssplit", no_rootfs_split);
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
* the partition definitions.
*
* We don't register the master, or expect the caller to have done so,
* for reasons of data integrity.
*/
int add_mtd_partitions(struct mtd_info *master,
const struct mtd_partition *parts,
int nbparts)
{
struct mtd_part *slave;
uint64_t cur_offset = 0;
int i;
#ifdef CONFIG_MTD_ROOTFS_SPLIT
int ret;
#endif
printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
for (i = 0; i < nbparts; i++) {
slave = allocate_partition(master, parts + i, i, cur_offset);
if (IS_ERR(slave))
return PTR_ERR(slave);
mutex_lock(&mtd_partitions_mutex);
list_add(&slave->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
if (!strcmp(parts[i].name, "rootfs")) {
#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
if (ROOT_DEV == 0) {
printk(KERN_NOTICE "mtd: partition \"rootfs\" "
"set to be root filesystem\n");
ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
}
#endif
#ifdef CONFIG_MTD_ROOTFS_SPLIT
if (rootfs_split) {
ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
/* if (ret == 0)
* j++; */
}
#endif
}
cur_offset = slave->offset + slave->mtd.size;
}
return 0;
}
int mtd_device_refresh(struct mtd_info *mtd)
{
int ret = 0;
if (IS_PART(mtd)) {
struct mtd_part *part;
struct mtd_info *master;
part = PART(mtd);
master = part->master;
if (master->refresh_device)
ret = master->refresh_device(master);
}
if (!ret && mtd->refresh_device)
ret = mtd->refresh_device(mtd);
#ifdef CONFIG_MTD_ROOTFS_SPLIT
if (rootfs_split) {
if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
refresh_rootfs_split(mtd);
}
#endif
return 0;
}
EXPORT_SYMBOL_GPL(mtd_device_refresh);
static DEFINE_SPINLOCK(part_parser_lock);
static LIST_HEAD(part_parsers);
static struct mtd_part_parser *get_partition_parser(const char *name)
{
struct mtd_part_parser *p, *ret = NULL;
spin_lock(&part_parser_lock);
list_for_each_entry(p, &part_parsers, list)
if (!strcmp(p->name, name) && try_module_get(p->owner)) {
ret = p;
break;
}
spin_unlock(&part_parser_lock);
return ret;
}
#define put_partition_parser(p) do { module_put((p)->owner); } while (0)
int register_mtd_parser(struct mtd_part_parser *p)
{
spin_lock(&part_parser_lock);
list_add(&p->list, &part_parsers);
spin_unlock(&part_parser_lock);
return 0;
}
EXPORT_SYMBOL_GPL(register_mtd_parser);
int deregister_mtd_parser(struct mtd_part_parser *p)
{
spin_lock(&part_parser_lock);
list_del(&p->list);
spin_unlock(&part_parser_lock);
return 0;
}
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
/*
* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
* are changing this array!
*/
static const char *default_mtd_part_types[] = {
"cmdlinepart",
"ofpart",
NULL
};
/**
* parse_mtd_partitions - parse MTD partitions
* @master: the master partition (describes whole MTD device)
* @types: names of partition parsers to try or %NULL
* @pparts: array of partitions found is returned here
* @data: MTD partition parser-specific data
*
* This function tries to find partition on MTD device @master. It uses MTD
* partition parsers, specified in @types. However, if @types is %NULL, then
* the default list of parsers is used. The default list contains only the
* "cmdlinepart" and "ofpart" parsers ATM.
*
* This function may return:
* o a negative error code in case of failure
* o zero if no partitions were found
* o a positive number of found partitions, in which case on exit @pparts will
* point to an array containing this number of &struct mtd_info objects.
*/
int parse_mtd_partitions(struct mtd_info *master, const char **types,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct mtd_part_parser *parser;
int ret = 0;
if (!types)
types = default_mtd_part_types;
for ( ; ret <= 0 && *types; types++) {
parser = get_partition_parser(*types);
if (!parser && !request_module("%s", *types))
parser = get_partition_parser(*types);
if (!parser)
continue;
ret = (*parser->parse_fn)(master, pparts, data);
if (ret > 0) {
printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
ret, parser->name, master->name);
}
put_partition_parser(parser);
}
return ret;
}
int mtd_is_partition(struct mtd_info *mtd)
{
struct mtd_part *part;
int ispart = 0;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry(part, &mtd_partitions, list)
if (&part->mtd == mtd) {
ispart = 1;
break;
}
mutex_unlock(&mtd_partitions_mutex);
return ispart;
}
EXPORT_SYMBOL_GPL(mtd_is_partition);