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mtd: mtdpart: implement proper partition handling 

Instead of collecting partitions in a flat list, create a hierarchy
within the mtd_info structure: use a partitions list to keep track of
the partitions of an MTD device (which might be itself a partition of
another MTD device), a pointer to the parent device (NULL when the MTD
device is the root one, not a partition).

By also saving directly in mtd_info the offset of the partition, we
can get rid of the mtd_part structure.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Miquel Raynal 2018-09-29 12:58:27 +02:00 committed by Jagan Teki
parent ff4afa8a98
commit 2a74930da5
4 changed files with 209 additions and 239 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/mtd/mtdcore.c
View File

@ -426,6 +426,8 @@ int add_mtd_device(struct mtd_info *mtd)
mtd->index = i;
mtd->usecount = 0;
INIT_LIST_HEAD(&mtd->partitions);
/* default value if not set by driver */
if (mtd->bitflip_threshold == 0)
mtd->bitflip_threshold = mtd->ecc_strength;

379
drivers/mtd/mtdpart.c
View File

@ -30,29 +30,12 @@
#include "mtdcore.h"
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
#ifndef __UBOOT__
static DEFINE_MUTEX(mtd_partitions_mutex);
#else
DEFINE_MUTEX(mtd_partitions_mutex);
#endif
/* 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))
#ifdef __UBOOT__
/* from mm/util.c */
@ -294,19 +277,18 @@ void mtd_free_parsed_partitions(struct mtd_partition *parts,
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;
res = part->master->_read(part->master, from + part->offset, len,
stats = mtd->parent->ecc_stats;
res = mtd->parent->_read(mtd->parent, from + mtd->offset, len,
retlen, buf);
if (unlikely(mtd_is_eccerr(res)))
mtd->ecc_stats.failed +=
part->master->ecc_stats.failed - stats.failed;
mtd->parent->ecc_stats.failed - stats.failed;
else
mtd->ecc_stats.corrected +=
part->master->ecc_stats.corrected - stats.corrected;
mtd->parent->ecc_stats.corrected - stats.corrected;
return res;
}
@ -314,17 +296,13 @@ static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
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);
return part->master->_point(part->master, from + part->offset, len,
return mtd->parent->_point(mtd->parent, from + mtd->offset, len,
retlen, virt, phys);
}
static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
struct mtd_part *part = PART(mtd);
return part->master->_unpoint(part->master, from + part->offset, len);
return mtd->parent->_unpoint(mtd->parent, from + mtd->offset, len);
}
#endif
@ -333,17 +311,13 @@ static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
unsigned long offset,
unsigned long flags)
{
struct mtd_part *part = PART(mtd);
offset += part->offset;
return part->master->_get_unmapped_area(part->master, len, offset,
flags);
offset += mtd->offset;
return mtd->parent->_get_unmapped_area(mtd->parent, 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)
@ -368,7 +342,7 @@ static int part_read_oob(struct mtd_info *mtd, loff_t from,
return -EINVAL;
}
res = part->master->_read_oob(part->master, from + part->offset, ops);
res = mtd->parent->_read_oob(mtd->parent, from + mtd->offset, ops);
if (unlikely(res)) {
if (mtd_is_bitflip(res))
mtd->ecc_stats.corrected++;
@ -381,99 +355,87 @@ static int part_read_oob(struct mtd_info *mtd, loff_t from,
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 part->master->_read_user_prot_reg(part->master, from, len,
return mtd->parent->_read_user_prot_reg(mtd->parent, from, len,
retlen, buf);
}
static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
size_t *retlen, struct otp_info *buf)
{
struct mtd_part *part = PART(mtd);
return part->master->_get_user_prot_info(part->master, len, retlen,
return mtd->parent->_get_user_prot_info(mtd->parent, len, retlen,
buf);
}
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 part->master->_read_fact_prot_reg(part->master, from, len,
return mtd->parent->_read_fact_prot_reg(mtd->parent, from, len,
retlen, buf);
}
static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
size_t *retlen, struct otp_info *buf)
{
struct mtd_part *part = PART(mtd);
return part->master->_get_fact_prot_info(part->master, len, retlen,
return mtd->parent->_get_fact_prot_info(mtd->parent, len, retlen,
buf);
}
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);
return part->master->_write(part->master, to + part->offset, len,
return mtd->parent->_write(mtd->parent, to + mtd->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);
return part->master->_panic_write(part->master, to + part->offset, len,
return mtd->parent->_panic_write(mtd->parent, to + mtd->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 (to >= mtd->size)
return -EINVAL;
if (ops->datbuf && to + ops->len > mtd->size)
return -EINVAL;
return part->master->_write_oob(part->master, to + part->offset, ops);
return mtd->parent->_write_oob(mtd->parent, to + mtd->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 part->master->_write_user_prot_reg(part->master, from, len,
return mtd->parent->_write_user_prot_reg(mtd->parent, 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 part->master->_lock_user_prot_reg(part->master, from, len);
return mtd->parent->_lock_user_prot_reg(mtd->parent, from, len);
}
#ifndef __UBOOT__
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);
return part->master->_writev(part->master, vecs, count,
to + part->offset, retlen);
return mtd->parent->_writev(mtd->parent, vecs, count,
to + mtd->offset, retlen);
}
#endif
static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct mtd_part *part = PART(mtd);
int ret;
instr->addr += part->offset;
ret = part->master->_erase(part->master, instr);
instr->addr += mtd->offset;
ret = mtd->parent->_erase(mtd->parent, instr);
if (ret) {
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
instr->fail_addr -= mtd->offset;
instr->addr -= mtd->offset;
}
return ret;
}
@ -481,11 +443,9 @@ static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
void mtd_erase_callback(struct erase_info *instr)
{
if (instr->mtd->_erase == part_erase) {
struct mtd_part *part = PART(instr->mtd);
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
instr->fail_addr -= instr->mtd->offset;
instr->addr -= instr->mtd->offset;
}
if (instr->callback)
instr->callback(instr);
@ -494,107 +454,112 @@ 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);
return part->master->_lock(part->master, ofs + part->offset, len);
return mtd->parent->_lock(mtd->parent, ofs + mtd->offset, len);
}
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
return part->master->_unlock(part->master, ofs + part->offset, len);
return mtd->parent->_unlock(mtd->parent, ofs + mtd->offset, len);
}
static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = PART(mtd);
return part->master->_is_locked(part->master, ofs + part->offset, len);
return mtd->parent->_is_locked(mtd->parent, ofs + mtd->offset, len);
}
static void part_sync(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
part->master->_sync(part->master);
mtd->parent->_sync(mtd->parent);
}
#ifndef __UBOOT__
static int part_suspend(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
return part->master->_suspend(part->master);
return mtd->parent->_suspend(mtd->parent);
}
static void part_resume(struct mtd_info *mtd)
{
struct mtd_part *part = PART(mtd);
part->master->_resume(part->master);
mtd->parent->_resume(mtd->parent);
}
#endif
static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
ofs += part->offset;
return part->master->_block_isreserved(part->master, ofs);
ofs += mtd->offset;
return mtd->parent->_block_isreserved(mtd->parent, ofs);
}
static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
ofs += part->offset;
return part->master->_block_isbad(part->master, ofs);
ofs += mtd->offset;
return mtd->parent->_block_isbad(mtd->parent, ofs);
}
static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = PART(mtd);
int res;
ofs += part->offset;
res = part->master->_block_markbad(part->master, ofs);
ofs += mtd->offset;
res = mtd->parent->_block_markbad(mtd->parent, ofs);
if (!res)
mtd->ecc_stats.badblocks++;
return res;
}
static inline void free_partition(struct mtd_part *p)
static inline void free_partition(struct mtd_info *p)
{
kfree(p->mtd.name);
kfree(p->name);
kfree(p);
}
/*
* This function unregisters and destroy all slave MTD objects which are
* attached to the given master MTD object.
* attached to the given master MTD object, recursively.
*/
int del_mtd_partitions(struct mtd_info *master)
static int do_del_mtd_partitions(struct mtd_info *master)
{
struct mtd_part *slave, *next;
struct mtd_info *slave, *next;
int ret, err = 0;
debug("Deleting MTD partitions on \"%s\":\n", master->name);
list_for_each_entry_safe(slave, next, &master->partitions, node) {
if (mtd_has_partitions(slave))
del_mtd_partitions(slave);
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);
debug("Deleting %s MTD partition\n", slave->name);
ret = del_mtd_device(slave);
if (ret < 0) {
printf("Error when deleting partition \"%s\" (%d)\n",
slave->name, ret);
err = ret;
continue;
}
list_del(&slave->list);
list_del(&slave->node);
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)
int del_mtd_partitions(struct mtd_info *master)
{
struct mtd_part *slave;
int ret;
debug("Deleting MTD partitions on \"%s\":\n", master->name);
mutex_lock(&mtd_partitions_mutex);
ret = do_del_mtd_partitions(master);
mutex_unlock(&mtd_partitions_mutex);
return ret;
}
static struct mtd_info *allocate_partition(struct mtd_info *master,
const struct mtd_partition *part,
int partno, uint64_t cur_offset)
{
struct mtd_info *slave;
char *name;
/* allocate the partition structure */
@ -609,85 +574,87 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
}
/* 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->type = master->type;
slave->flags = master->flags & ~part->mask_flags;
slave->size = part->size;
slave->writesize = master->writesize;
slave->writebufsize = master->writebufsize;
slave->oobsize = master->oobsize;
slave->oobavail = master->oobavail;
slave->subpage_sft = master->subpage_sft;
slave->mtd.name = name;
slave->mtd.owner = master->owner;
slave->name = name;
slave->owner = master->owner;
#ifndef __UBOOT__
slave->mtd.backing_dev_info = master->backing_dev_info;
slave->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->dev.parent = master->dev.parent;
#endif
if (master->_read)
slave->mtd._read = part_read;
slave->_read = part_read;
if (master->_write)
slave->mtd._write = part_write;
slave->_write = part_write;
if (master->_panic_write)
slave->mtd._panic_write = part_panic_write;
slave->_panic_write = part_panic_write;
#ifndef __UBOOT__
if (master->_point && master->_unpoint) {
slave->mtd._point = part_point;
slave->mtd._unpoint = part_unpoint;
slave->_point = part_point;
slave->_unpoint = part_unpoint;
}
#endif
if (master->_get_unmapped_area)
slave->mtd._get_unmapped_area = part_get_unmapped_area;
slave->_get_unmapped_area = part_get_unmapped_area;
if (master->_read_oob)
slave->mtd._read_oob = part_read_oob;
slave->_read_oob = part_read_oob;
if (master->_write_oob)
slave->mtd._write_oob = part_write_oob;
slave->_write_oob = part_write_oob;
if (master->_read_user_prot_reg)
slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
slave->_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;
slave->_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;
slave->_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;
slave->_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;
slave->_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;
slave->_get_fact_prot_info = part_get_fact_prot_info;
if (master->_sync)
slave->mtd._sync = part_sync;
slave->_sync = part_sync;
#ifndef __UBOOT__
if (!partno && !master->dev.class && master->_suspend &&
master->_resume) {
slave->mtd._suspend = part_suspend;
slave->mtd._resume = part_resume;
slave->_suspend = part_suspend;
slave->_resume = part_resume;
}
if (master->_writev)
slave->mtd._writev = part_writev;
slave->_writev = part_writev;
#endif
if (master->_lock)
slave->mtd._lock = part_lock;
slave->_lock = part_lock;
if (master->_unlock)
slave->mtd._unlock = part_unlock;
slave->_unlock = part_unlock;
if (master->_is_locked)
slave->mtd._is_locked = part_is_locked;
slave->_is_locked = part_is_locked;
if (master->_block_isreserved)
slave->mtd._block_isreserved = part_block_isreserved;
slave->_block_isreserved = part_block_isreserved;
if (master->_block_isbad)
slave->mtd._block_isbad = part_block_isbad;
slave->_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->_block_markbad = part_block_markbad;
slave->_erase = part_erase;
slave->parent = master;
slave->offset = part->offset;
INIT_LIST_HEAD(&slave->partitions);
INIT_LIST_HEAD(&slave->node);
if (slave->offset == MTDPART_OFS_APPEND)
slave->offset = cur_offset;
@ -703,41 +670,41 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
}
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;
if (master->size - slave->offset >= slave->size) {
slave->size = master->size - slave->offset
- slave->size;
} else {
debug("mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
part->name, master->size - slave->offset,
slave->mtd.size);
slave->size);
/* register to preserve ordering */
goto out_register;
}
}
if (slave->mtd.size == MTDPART_SIZ_FULL)
slave->mtd.size = master->size - slave->offset;
if (slave->size == MTDPART_SIZ_FULL)
slave->size = master->size - slave->offset;
debug("0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
(unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
(unsigned long long)(slave->offset + slave->size), slave->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;
slave->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;
if (slave->offset + slave->size > master->size) {
slave->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);
part->name, master->name, slave->size);
}
if (master->numeraseregions > 1) {
/* Deal with variable erase size stuff */
int i, max = master->numeraseregions;
u64 end = slave->offset + slave->mtd.size;
u64 end = slave->offset + slave->size;
struct mtd_erase_region_info *regions = master->eraseregions;
/* Find the first erase regions which is part of this
@ -750,44 +717,43 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
/* Pick biggest erasesize */
for (; i < max && regions[i].offset < end; i++) {
if (slave->mtd.erasesize < regions[i].erasesize) {
slave->mtd.erasesize = regions[i].erasesize;
if (slave->erasesize < regions[i].erasesize)
slave->erasesize = regions[i].erasesize;
}
}
BUG_ON(slave->mtd.erasesize == 0);
WARN_ON(slave->erasesize == 0);
} else {
/* Single erase size */
slave->mtd.erasesize = master->erasesize;
slave->erasesize = master->erasesize;
}
if ((slave->mtd.flags & MTD_WRITEABLE) &&
mtd_mod_by_eb(slave->offset, &slave->mtd)) {
if ((slave->flags & MTD_WRITEABLE) &&
mtd_mod_by_eb(slave->offset, slave)) {
/* Doesn't start on a boundary of major erase size */
/* FIXME: Let it be writable if it is on a boundary of
* _minor_ erase size though */
slave->mtd.flags &= ~MTD_WRITEABLE;
slave->flags &= ~MTD_WRITEABLE;
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
part->name);
}
if ((slave->mtd.flags & MTD_WRITEABLE) &&
mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
slave->mtd.flags &= ~MTD_WRITEABLE;
if ((slave->flags & MTD_WRITEABLE) &&
mtd_mod_by_eb(slave->size, slave)) {
slave->flags &= ~MTD_WRITEABLE;
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
part->name);
}
slave->mtd.ecclayout = master->ecclayout;
slave->mtd.ecc_step_size = master->ecc_step_size;
slave->mtd.ecc_strength = master->ecc_strength;
slave->mtd.bitflip_threshold = master->bitflip_threshold;
slave->ecclayout = master->ecclayout;
slave->ecc_step_size = master->ecc_step_size;
slave->ecc_strength = master->ecc_strength;
slave->bitflip_threshold = master->bitflip_threshold;
if (master->_block_isbad) {
uint64_t offs = 0;
while (offs < slave->mtd.size) {
while (offs < slave->size) {
if (mtd_block_isbad(master, offs + slave->offset))
slave->mtd.ecc_stats.badblocks++;
offs += slave->mtd.erasesize;
slave->ecc_stats.badblocks++;
offs += slave->erasesize;
}
}
@ -800,7 +766,7 @@ int mtd_add_partition(struct mtd_info *master, const char *name,
long long offset, long long length)
{
struct mtd_partition part;
struct mtd_part *p, *new;
struct mtd_info *p, *new;
uint64_t start, end;
int ret = 0;
@ -829,21 +795,20 @@ int mtd_add_partition(struct mtd_info *master, const char *name,
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)))
list_for_each_entry(p, &master->partitions, node) {
if (start >= p->offset &&
(start < (p->offset + p->size)))
goto err_inv;
if ((end >= p->offset) &&
(end < (p->offset + p->mtd.size)))
if (end >= p->offset &&
(end < (p->offset + p->size)))
goto err_inv;
}
list_add(&new->list, &mtd_partitions);
list_add_tail(&new->node, &master->partitions);
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&new->mtd);
add_mtd_device(new);
return ret;
err_inv:
@ -855,18 +820,17 @@ EXPORT_SYMBOL_GPL(mtd_add_partition);
int mtd_del_partition(struct mtd_info *master, int partno)
{
struct mtd_part *slave, *next;
struct mtd_info *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);
list_for_each_entry_safe(slave, next, &master->partitions, node)
if (slave->index == partno) {
ret = del_mtd_device(slave);
if (ret < 0)
break;
list_del(&slave->list);
list_del(&slave->node);
free_partition(slave);
break;
}
@ -890,20 +854,10 @@ int add_mtd_partitions(struct mtd_info *master,
const struct mtd_partition *parts,
int nbparts)
{
struct mtd_part *slave;
struct mtd_info *slave;
uint64_t cur_offset = 0;
int i;
#ifdef __UBOOT__
/*
* Need to init the list here, since LIST_INIT() does not
* work on platforms where relocation has problems (like MIPS
* & PPC).
*/
if (mtd_partitions.next == NULL)
INIT_LIST_HEAD(&mtd_partitions);
#endif
debug("Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
for (i = 0; i < nbparts; i++) {
@ -912,12 +866,12 @@ int add_mtd_partitions(struct mtd_info *master,
return PTR_ERR(slave);
mutex_lock(&mtd_partitions_mutex);
list_add(&slave->list, &mtd_partitions);
list_add_tail(&slave->node, &master->partitions);
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
add_mtd_device(slave);
cur_offset = slave->offset + slave->mtd.size;
cur_offset = slave->offset + slave->size;
}
return 0;
@ -1020,29 +974,12 @@ int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
}
#endif
int mtd_is_partition(const 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);
/* 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;
if (mtd_is_partition(mtd))
return mtd->parent->size;
return PART(mtd)->master->size;
return mtd->size;
}
EXPORT_SYMBOL_GPL(mtd_get_device_size);

32
include/linux/mtd/mtd.h
View File

@ -20,6 +20,7 @@
#include <linux/compat.h>
#include <mtd/mtd-abi.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <div64.h>
#if IS_ENABLED(CONFIG_DM)
#include <dm/device.h>
@ -307,6 +308,27 @@ struct mtd_info {
struct udevice *dev;
#endif
int usecount;
/* MTD devices do not have any parent. MTD partitions do. */
struct mtd_info *parent;
/*
* Offset of the partition relatively to the parent offset.
* Is 0 for real MTD devices (ie. not partitions).
*/
u64 offset;
/*
* List node used to add an MTD partition to the parent
* partition list.
*/
struct list_head node;
/*
* List of partitions attached to this MTD device (the parent
* MTD device can itself be a partition).
*/
struct list_head partitions;
};
#if IS_ENABLED(CONFIG_DM)
@ -334,6 +356,16 @@ static inline const struct device_node *mtd_get_of_node(struct mtd_info *mtd)
}
#endif
static inline bool mtd_is_partition(const struct mtd_info *mtd)
{
return mtd->parent;
}
static inline bool mtd_has_partitions(const struct mtd_info *mtd)
{
return !list_empty(&mtd->partitions);
}
int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobecc);
int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,

1
include/linux/mtd/partitions.h
View File

@ -81,7 +81,6 @@ extern void register_mtd_parser(struct mtd_part_parser *parser);
extern void deregister_mtd_parser(struct mtd_part_parser *parser);
#endif
int mtd_is_partition(const struct mtd_info *mtd);
int mtd_add_partition(struct mtd_info *master, const char *name,
long long offset, long long length);
int mtd_del_partition(struct mtd_info *master, int partno);