mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 13:44:15 +08:00
mtd: prepare partition add and del functions for ioctl requests
mtd_is_master, mtd_add_partition and mtd_del_partition functions are added to give the possibility of partition manipulation by ioctl request. The old partition add function is modified to fit the dynamic allocation. Signed-off-by: Roman Tereshonkov <roman.tereshonkov@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Roman Tereshonkov
David Woodhouse
parent
93ac5a552c
commit
5daa7b2149
@ -29,9 +29,11 @@
|
||||
#include <linux/kmod.h>
|
||||
#include <linux/mtd/mtd.h>
|
||||
#include <linux/mtd/partitions.h>
|
||||
#include <linux/err.h>
|
||||
|
||||
/* Our partition linked list */
|
||||
static LIST_HEAD(mtd_partitions);
|
||||
static DEFINE_MUTEX(mtd_partitions_mutex);
|
||||
|
||||
/* Our partition node structure */
|
||||
struct mtd_part {
|
||||
@ -326,6 +328,12 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
|
||||
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.
|
||||
@ -334,33 +342,42 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
|
||||
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);
|
||||
del_mtd_device(&slave->mtd);
|
||||
kfree(slave);
|
||||
free_partition(slave);
|
||||
}
|
||||
mutex_unlock(&mtd_partitions_mutex);
|
||||
|
||||
return 0;
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(del_mtd_partitions);
|
||||
|
||||
static struct mtd_part *add_one_partition(struct mtd_info *master,
|
||||
const struct mtd_partition *part, int partno,
|
||||
uint64_t cur_offset)
|
||||
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);
|
||||
if (!slave) {
|
||||
name = kstrdup(part->name, GFP_KERNEL);
|
||||
if (!name || !slave) {
|
||||
printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
|
||||
master->name);
|
||||
del_mtd_partitions(master);
|
||||
return NULL;
|
||||
master->name);
|
||||
kfree(name);
|
||||
kfree(slave);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
list_add(&slave->list, &mtd_partitions);
|
||||
|
||||
/* set up the MTD object for this partition */
|
||||
slave->mtd.type = master->type;
|
||||
@ -371,7 +388,7 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
|
||||
slave->mtd.oobavail = master->oobavail;
|
||||
slave->mtd.subpage_sft = master->subpage_sft;
|
||||
|
||||
slave->mtd.name = part->name;
|
||||
slave->mtd.name = name;
|
||||
slave->mtd.owner = master->owner;
|
||||
slave->mtd.backing_dev_info = master->backing_dev_info;
|
||||
|
||||
@ -518,12 +535,89 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
|
||||
}
|
||||
|
||||
out_register:
|
||||
/* register our partition */
|
||||
add_mtd_device(&slave->mtd);
|
||||
|
||||
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);
|
||||
|
||||
/*
|
||||
* 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
|
||||
@ -544,9 +638,16 @@ int add_mtd_partitions(struct mtd_info *master,
|
||||
printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
|
||||
|
||||
for (i = 0; i < nbparts; i++) {
|
||||
slave = add_one_partition(master, parts + i, i, cur_offset);
|
||||
if (!slave)
|
||||
return -ENOMEM;
|
||||
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);
|
||||
|
||||
cur_offset = slave->offset + slave->mtd.size;
|
||||
}
|
||||
|
||||
@ -618,3 +719,20 @@ int parse_mtd_partitions(struct mtd_info *master, const char **types,
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(parse_mtd_partitions);
|
||||
|
||||
int mtd_is_master(struct mtd_info *mtd)
|
||||
{
|
||||
struct mtd_part *part;
|
||||
int nopart = 0;
|
||||
|
||||
mutex_lock(&mtd_partitions_mutex);
|
||||
list_for_each_entry(part, &mtd_partitions, list)
|
||||
if (&part->mtd == mtd) {
|
||||
nopart = 1;
|
||||
break;
|
||||
}
|
||||
mutex_unlock(&mtd_partitions_mutex);
|
||||
|
||||
return nopart;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(mtd_is_master);
|
||||
|
||||
@ -89,4 +89,9 @@ static inline int mtd_has_cmdlinepart(void) { return 1; }
|
||||
static inline int mtd_has_cmdlinepart(void) { return 0; }
|
||||
#endif
|
||||
|
||||
int mtd_is_master(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);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user