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mtd: implement proper partition handling

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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.

While at it, be consistent in the naming of the mtd_info structures to
ease the understanding of the new hierarchy: these structures are
usually called 'mtd', unless there are multiple instances of the same
structure. In this case, there is usually a parent/child bound so we
will call them 'parent' and 'child'.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200114090952.11232-1-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2020-01-14 10:09:52 +01:00
parent 98d54f81e3
commit 46b5889cc2
5 changed files with 477 additions and 604 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/mtd/mtdchar.c
View file

@ -349,6 +349,7 @@ static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
uint64_t start, uint32_t length, void __user *ptr,
uint32_t __user *retp)
{
struct mtd_info *master = mtd_get_master(mtd);
struct mtd_file_info *mfi = file->private_data;
struct mtd_oob_ops ops = {};
uint32_t retlen;
@ -360,7 +361,7 @@ static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
if (length > 4096)
return -EINVAL;
if (!mtd->_write_oob)
if (!master->_write_oob)
return -EOPNOTSUPP;
ops.ooblen = length;
@ -586,6 +587,7 @@ static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
static int mtdchar_write_ioctl(struct mtd_info *mtd,
struct mtd_write_req __user *argp)
{
struct mtd_info *master = mtd_get_master(mtd);
struct mtd_write_req req;
struct mtd_oob_ops ops = {};
const void __user *usr_data, *usr_oob;
@ -597,9 +599,8 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
usr_data = (const void __user *)(uintptr_t)req.usr_data;
usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
if (!mtd->_write_oob)
if (!master->_write_oob)
return -EOPNOTSUPP;
ops.mode = req.mode;
ops.len = (size_t)req.len;
ops.ooblen = (size_t)req.ooblen;
@ -635,6 +636,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
struct mtd_info *master = mtd_get_master(mtd);
void __user *argp = (void __user *)arg;
int ret = 0;
struct mtd_info_user info;
@ -824,7 +826,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct nand_oobinfo oi;
if (!mtd->ooblayout)
if (!master->ooblayout)
return -EOPNOTSUPP;
ret = get_oobinfo(mtd, &oi);
@ -918,7 +920,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct nand_ecclayout_user *usrlay;
if (!mtd->ooblayout)
if (!master->ooblayout)
return -EOPNOTSUPP;
usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);

240
drivers/mtd/mtdcore.c
View file

@ -456,13 +456,14 @@ static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state,
int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
struct mtd_pairing_info *info)
{
int npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd);
struct mtd_info *master = mtd_get_master(mtd);
int npairs = mtd_wunit_per_eb(master) / mtd_pairing_groups(master);
if (wunit < 0 || wunit >= npairs)
return -EINVAL;
if (mtd->pairing && mtd->pairing->get_info)
return mtd->pairing->get_info(mtd, wunit, info);
if (master->pairing && master->pairing->get_info)
return master->pairing->get_info(master, wunit, info);
info->group = 0;
info->pair = wunit;
@ -498,15 +499,16 @@ EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info);
int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
const struct mtd_pairing_info *info)
{
int ngroups = mtd_pairing_groups(mtd);
int npairs = mtd_wunit_per_eb(mtd) / ngroups;
struct mtd_info *master = mtd_get_master(mtd);
int ngroups = mtd_pairing_groups(master);
int npairs = mtd_wunit_per_eb(master) / ngroups;
if (!info || info->pair < 0 || info->pair >= npairs ||
info->group < 0 || info->group >= ngroups)
return -EINVAL;
if (mtd->pairing && mtd->pairing->get_wunit)
return mtd->pairing->get_wunit(mtd, info);
if (master->pairing && master->pairing->get_wunit)
return mtd->pairing->get_wunit(master, info);
return info->pair;
}
@ -524,10 +526,12 @@ EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit);
*/
int mtd_pairing_groups(struct mtd_info *mtd)
{
if (!mtd->pairing || !mtd->pairing->ngroups)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->pairing || !master->pairing->ngroups)
return 1;
return mtd->pairing->ngroups;
return master->pairing->ngroups;
}
EXPORT_SYMBOL_GPL(mtd_pairing_groups);
@ -587,6 +591,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
int add_mtd_device(struct mtd_info *mtd)
{
struct mtd_info *master = mtd_get_master(mtd);
struct mtd_notifier *not;
int i, error;
@ -608,7 +613,7 @@ int add_mtd_device(struct mtd_info *mtd)
(mtd->_read && mtd->_read_oob)))
return -EINVAL;
if (WARN_ON((!mtd->erasesize || !mtd->_erase) &&
if (WARN_ON((!mtd->erasesize || !master->_erase) &&
!(mtd->flags & MTD_NO_ERASE)))
return -EINVAL;
@ -765,7 +770,8 @@ static void mtd_set_dev_defaults(struct mtd_info *mtd)
pr_debug("mtd device won't show a device symlink in sysfs\n");
}
mtd->orig_flags = mtd->flags;
INIT_LIST_HEAD(&mtd->partitions);
mutex_init(&mtd->master.partitions_lock);
}
/**
@ -971,20 +977,26 @@ EXPORT_SYMBOL_GPL(get_mtd_device);
int __get_mtd_device(struct mtd_info *mtd)
{
struct mtd_info *master = mtd_get_master(mtd);
int err;
if (!try_module_get(mtd->owner))
if (!try_module_get(master->owner))
return -ENODEV;
if (mtd->_get_device) {
err = mtd->_get_device(mtd);
if (master->_get_device) {
err = master->_get_device(mtd);
if (err) {
module_put(mtd->owner);
module_put(master->owner);
return err;
}
}
while (mtd->parent) {
mtd->usecount++;
mtd = mtd->parent;
}
return 0;
}
EXPORT_SYMBOL_GPL(__get_mtd_device);
@ -1038,13 +1050,18 @@ EXPORT_SYMBOL_GPL(put_mtd_device);
void __put_mtd_device(struct mtd_info *mtd)
{
struct mtd_info *master = mtd_get_master(mtd);
while (mtd->parent) {
--mtd->usecount;
BUG_ON(mtd->usecount < 0);
mtd = mtd->parent;
}
if (mtd->_put_device)
mtd->_put_device(mtd);
if (master->_put_device)
master->_put_device(master);
module_put(mtd->owner);
module_put(master->owner);
}
EXPORT_SYMBOL_GPL(__put_mtd_device);
@ -1055,9 +1072,13 @@ EXPORT_SYMBOL_GPL(__put_mtd_device);
*/
int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct mtd_info *master = mtd_get_master(mtd);
u64 mst_ofs = mtd_get_master_ofs(mtd, 0);
int ret;
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
if (!mtd->erasesize || !mtd->_erase)
if (!mtd->erasesize || !master->_erase)
return -ENOTSUPP;
if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr)
@ -1069,7 +1090,14 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
return 0;
ledtrig_mtd_activity();
return mtd->_erase(mtd, instr);
instr->addr += mst_ofs;
ret = master->_erase(master, instr);
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= mst_ofs;
instr->addr -= mst_ofs;
return ret;
}
EXPORT_SYMBOL_GPL(mtd_erase);
@ -1079,30 +1107,36 @@ EXPORT_SYMBOL_GPL(mtd_erase);
int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
void **virt, resource_size_t *phys)
{
struct mtd_info *master = mtd_get_master(mtd);
*retlen = 0;
*virt = NULL;
if (phys)
*phys = 0;
if (!mtd->_point)
if (!master->_point)
return -EOPNOTSUPP;
if (from < 0 || from >= mtd->size || len > mtd->size - from)
return -EINVAL;
if (!len)
return 0;
return mtd->_point(mtd, from, len, retlen, virt, phys);
from = mtd_get_master_ofs(mtd, from);
return master->_point(master, from, len, retlen, virt, phys);
}
EXPORT_SYMBOL_GPL(mtd_point);
/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
if (!mtd->_unpoint)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_unpoint)
return -EOPNOTSUPP;
if (from < 0 || from >= mtd->size || len > mtd->size - from)
return -EINVAL;
if (!len)
return 0;
return mtd->_unpoint(mtd, from, len);
return master->_unpoint(master, mtd_get_master_ofs(mtd, from), len);
}
EXPORT_SYMBOL_GPL(mtd_unpoint);
@ -1129,6 +1163,25 @@ unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
}
EXPORT_SYMBOL_GPL(mtd_get_unmapped_area);
static void mtd_update_ecc_stats(struct mtd_info *mtd, struct mtd_info *master,
const struct mtd_ecc_stats *old_stats)
{
struct mtd_ecc_stats diff;
if (master == mtd)
return;
diff = master->ecc_stats;
diff.failed -= old_stats->failed;
diff.corrected -= old_stats->corrected;
while (mtd->parent) {
mtd->ecc_stats.failed += diff.failed;
mtd->ecc_stats.corrected += diff.corrected;
mtd = mtd->parent;
}
}
int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
u_char *buf)
{
@ -1171,8 +1224,10 @@ EXPORT_SYMBOL_GPL(mtd_write);
int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
const u_char *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
*retlen = 0;
if (!mtd->_panic_write)
if (!master->_panic_write)
return -EOPNOTSUPP;
if (to < 0 || to >= mtd->size || len > mtd->size - to)
return -EINVAL;
@ -1183,7 +1238,8 @@ int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
if (!mtd->oops_panic_write)
mtd->oops_panic_write = true;
return mtd->_panic_write(mtd, to, len, retlen, buf);
return master->_panic_write(master, mtd_get_master_ofs(mtd, to), len,
retlen, buf);
}
EXPORT_SYMBOL_GPL(mtd_panic_write);
@ -1222,7 +1278,10 @@ static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs,
int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
{
struct mtd_info *master = mtd_get_master(mtd);
struct mtd_ecc_stats old_stats = master->ecc_stats;
int ret_code;
ops->retlen = ops->oobretlen = 0;
ret_code = mtd_check_oob_ops(mtd, from, ops);
@ -1232,15 +1291,18 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
ledtrig_mtd_activity();
/* Check the validity of a potential fallback on mtd->_read */
if (!mtd->_read_oob && (!mtd->_read || ops->oobbuf))
if (!master->_read_oob && (!master->_read || ops->oobbuf))
return -EOPNOTSUPP;
if (mtd->_read_oob)
ret_code = mtd->_read_oob(mtd, from, ops);
from = mtd_get_master_ofs(mtd, from);
if (master->_read_oob)
ret_code = master->_read_oob(master, from, ops);
else
ret_code = mtd->_read(mtd, from, ops->len, &ops->retlen,
ret_code = master->_read(master, from, ops->len, &ops->retlen,
ops->datbuf);
mtd_update_ecc_stats(mtd, master, &old_stats);
/*
* In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics
* similar to mtd->_read(), returning a non-negative integer
@ -1258,6 +1320,7 @@ EXPORT_SYMBOL_GPL(mtd_read_oob);
int mtd_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops)
{
struct mtd_info *master = mtd_get_master(mtd);
int ret;
ops->retlen = ops->oobretlen = 0;
@ -1272,13 +1335,15 @@ int mtd_write_oob(struct mtd_info *mtd, loff_t to,
ledtrig_mtd_activity();
/* Check the validity of a potential fallback on mtd->_write */
if (!mtd->_write_oob && (!mtd->_write || ops->oobbuf))
if (!master->_write_oob && (!master->_write || ops->oobbuf))
return -EOPNOTSUPP;
if (mtd->_write_oob)
return mtd->_write_oob(mtd, to, ops);
to = mtd_get_master_ofs(mtd, to);
if (master->_write_oob)
return master->_write_oob(master, to, ops);
else
return mtd->_write(mtd, to, ops->len, &ops->retlen,
return master->_write(master, to, ops->len, &ops->retlen,
ops->datbuf);
}
EXPORT_SYMBOL_GPL(mtd_write_oob);
@ -1302,15 +1367,17 @@ EXPORT_SYMBOL_GPL(mtd_write_oob);
int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobecc)
{
struct mtd_info *master = mtd_get_master(mtd);
memset(oobecc, 0, sizeof(*oobecc));
if (!mtd || section < 0)
if (!master || section < 0)
return -EINVAL;
if (!mtd->ooblayout || !mtd->ooblayout->ecc)
if (!master->ooblayout || !master->ooblayout->ecc)
return -ENOTSUPP;
return mtd->ooblayout->ecc(mtd, section, oobecc);
return master->ooblayout->ecc(master, section, oobecc);
}
EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
@ -1334,15 +1401,17 @@ EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
int mtd_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobfree)
{
struct mtd_info *master = mtd_get_master(mtd);
memset(oobfree, 0, sizeof(*oobfree));
if (!mtd || section < 0)
if (!master || section < 0)
return -EINVAL;
if (!mtd->ooblayout || !mtd->ooblayout->free)
if (!master->ooblayout || !master->ooblayout->free)
return -ENOTSUPP;
return mtd->ooblayout->free(mtd, section, oobfree);
return master->ooblayout->free(master, section, oobfree);
}
EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
@ -1651,60 +1720,69 @@ EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
struct otp_info *buf)
{
if (!mtd->_get_fact_prot_info)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_get_fact_prot_info)
return -EOPNOTSUPP;
if (!len)
return 0;
return mtd->_get_fact_prot_info(mtd, len, retlen, buf);
return master->_get_fact_prot_info(master, len, retlen, buf);
}
EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info);
int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
*retlen = 0;
if (!mtd->_read_fact_prot_reg)
if (!master->_read_fact_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf);
return master->_read_fact_prot_reg(master, from, len, retlen, buf);
}
EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg);
int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
struct otp_info *buf)
{
if (!mtd->_get_user_prot_info)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_get_user_prot_info)
return -EOPNOTSUPP;
if (!len)
return 0;
return mtd->_get_user_prot_info(mtd, len, retlen, buf);
return master->_get_user_prot_info(master, len, retlen, buf);
}
EXPORT_SYMBOL_GPL(mtd_get_user_prot_info);
int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
*retlen = 0;
if (!mtd->_read_user_prot_reg)
if (!master->_read_user_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf);
return master->_read_user_prot_reg(master, from, len, retlen, buf);
}
EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg);
int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_info *master = mtd_get_master(mtd);
int ret;
*retlen = 0;
if (!mtd->_write_user_prot_reg)
if (!master->_write_user_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
ret = mtd->_write_user_prot_reg(mtd, to, len, retlen, buf);
ret = master->_write_user_prot_reg(master, to, len, retlen, buf);
if (ret)
return ret;
@ -1718,80 +1796,105 @@ EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg);
int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len)
{
if (!mtd->_lock_user_prot_reg)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_lock_user_prot_reg)
return -EOPNOTSUPP;
if (!len)
return 0;
return mtd->_lock_user_prot_reg(mtd, from, len);
return master->_lock_user_prot_reg(master, from, len);
}
EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg);
/* Chip-supported device locking */
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
if (!mtd->_lock)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_lock)
return -EOPNOTSUPP;
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
return -EINVAL;
if (!len)
return 0;
return mtd->_lock(mtd, ofs, len);
return master->_lock(master, mtd_get_master_ofs(mtd, ofs), len);
}
EXPORT_SYMBOL_GPL(mtd_lock);
int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
if (!mtd->_unlock)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_unlock)
return -EOPNOTSUPP;
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
return -EINVAL;
if (!len)
return 0;
return mtd->_unlock(mtd, ofs, len);
return master->_unlock(master, mtd_get_master_ofs(mtd, ofs), len);
}
EXPORT_SYMBOL_GPL(mtd_unlock);
int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
if (!mtd->_is_locked)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_is_locked)
return -EOPNOTSUPP;
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
return -EINVAL;
if (!len)
return 0;
return mtd->_is_locked(mtd, ofs, len);
return master->_is_locked(master, mtd_get_master_ofs(mtd, ofs), len);
}
EXPORT_SYMBOL_GPL(mtd_is_locked);
int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_info *master = mtd_get_master(mtd);
if (ofs < 0 || ofs >= mtd->size)
return -EINVAL;
if (!mtd->_block_isreserved)
if (!master->_block_isreserved)
return 0;
return mtd->_block_isreserved(mtd, ofs);
return master->_block_isreserved(master, mtd_get_master_ofs(mtd, ofs));
}
EXPORT_SYMBOL_GPL(mtd_block_isreserved);
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_info *master = mtd_get_master(mtd);
if (ofs < 0 || ofs >= mtd->size)
return -EINVAL;
if (!mtd->_block_isbad)
if (!master->_block_isbad)
return 0;
return mtd->_block_isbad(mtd, ofs);
return master->_block_isbad(master, mtd_get_master_ofs(mtd, ofs));
}
EXPORT_SYMBOL_GPL(mtd_block_isbad);
int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
if (!mtd->_block_markbad)
struct mtd_info *master = mtd_get_master(mtd);
int ret;
if (!master->_block_markbad)
return -EOPNOTSUPP;
if (ofs < 0 || ofs >= mtd->size)
return -EINVAL;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
return mtd->_block_markbad(mtd, ofs);
ret = master->_block_markbad(master, mtd_get_master_ofs(mtd, ofs));
if (ret)
return ret;
while (mtd->parent) {
mtd->ecc_stats.badblocks++;
mtd = mtd->parent;
}
return 0;
}
EXPORT_SYMBOL_GPL(mtd_block_markbad);
@ -1841,12 +1944,17 @@ static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
struct mtd_info *master = mtd_get_master(mtd);
*retlen = 0;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
if (!mtd->_writev)
if (!master->_writev)
return default_mtd_writev(mtd, vecs, count, to, retlen);
return mtd->_writev(mtd, vecs, count, to, retlen);
return master->_writev(master, vecs, count,
mtd_get_master_ofs(mtd, to), retlen);
}
EXPORT_SYMBOL_GPL(mtd_writev);

685
drivers/mtd/mtdpart.c
View file

@ -20,339 +20,52 @@
#include "mtdcore.h"
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
static DEFINE_MUTEX(mtd_partitions_mutex);
/**
* struct mtd_part - our partition node structure
*
* @mtd: struct holding partition details
* @parent: parent mtd - flash device or another partition
* @offset: partition offset relative to the *flash device*
*/
struct mtd_part {
struct mtd_info mtd;
struct mtd_info *parent;
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.
*/
static inline struct mtd_part *mtd_to_part(const struct mtd_info *mtd)
{
return container_of(mtd, struct mtd_part, mtd);
}
static u64 part_absolute_offset(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
if (!mtd_is_partition(mtd))
return 0;
return part_absolute_offset(part->parent) + part->offset;
}
/*
* 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)
static inline void free_partition(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
struct mtd_ecc_stats stats;
int res;
stats = part->parent->ecc_stats;
res = part->parent->_read(part->parent, from + part->offset, len,
retlen, buf);
if (unlikely(mtd_is_eccerr(res)))
mtd->ecc_stats.failed +=
part->parent->ecc_stats.failed - stats.failed;
else
mtd->ecc_stats.corrected +=
part->parent->ecc_stats.corrected - stats.corrected;
return res;
kfree(mtd->name);
kfree(mtd);
}
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 = mtd_to_part(mtd);
return part->parent->_point(part->parent, from + part->offset, len,
retlen, virt, phys);
}
static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_unpoint(part->parent, from + part->offset, len);
}
static int part_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
struct mtd_part *part = mtd_to_part(mtd);
struct mtd_ecc_stats stats;
int res;
stats = part->parent->ecc_stats;
res = part->parent->_read_oob(part->parent, from + part->offset, ops);
if (unlikely(mtd_is_eccerr(res)))
mtd->ecc_stats.failed +=
part->parent->ecc_stats.failed - stats.failed;
else
mtd->ecc_stats.corrected +=
part->parent->ecc_stats.corrected - stats.corrected;
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 = mtd_to_part(mtd);
return part->parent->_read_user_prot_reg(part->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 = mtd_to_part(mtd);
return part->parent->_get_user_prot_info(part->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 = mtd_to_part(mtd);
return part->parent->_read_fact_prot_reg(part->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 = mtd_to_part(mtd);
return part->parent->_get_fact_prot_info(part->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 = mtd_to_part(mtd);
return part->parent->_write(part->parent, 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 = mtd_to_part(mtd);
return part->parent->_panic_write(part->parent, 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 = mtd_to_part(mtd);
return part->parent->_write_oob(part->parent, 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 = mtd_to_part(mtd);
return part->parent->_write_user_prot_reg(part->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 = mtd_to_part(mtd);
return part->parent->_lock_user_prot_reg(part->parent, 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 = mtd_to_part(mtd);
return part->parent->_writev(part->parent, vecs, count,
to + part->offset, retlen);
}
static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
{
struct mtd_part *part = mtd_to_part(mtd);
int ret;
instr->addr += part->offset;
ret = part->parent->_erase(part->parent, instr);
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
instr->addr -= part->offset;
return ret;
}
static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_lock(part->parent, ofs + part->offset, len);
}
static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_unlock(part->parent, ofs + part->offset, len);
}
static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_is_locked(part->parent, ofs + part->offset, len);
}
static void part_sync(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
part->parent->_sync(part->parent);
}
static int part_suspend(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_suspend(part->parent);
}
static void part_resume(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
part->parent->_resume(part->parent);
}
static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = mtd_to_part(mtd);
ofs += part->offset;
return part->parent->_block_isreserved(part->parent, ofs);
}
static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = mtd_to_part(mtd);
ofs += part->offset;
return part->parent->_block_isbad(part->parent, ofs);
}
static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
struct mtd_part *part = mtd_to_part(mtd);
int res;
ofs += part->offset;
res = part->parent->_block_markbad(part->parent, ofs);
if (!res)
mtd->ecc_stats.badblocks++;
return res;
}
static int part_get_device(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_get_device(part->parent);
}
static void part_put_device(struct mtd_info *mtd)
{
struct mtd_part *part = mtd_to_part(mtd);
part->parent->_put_device(part->parent);
}
static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct mtd_part *part = mtd_to_part(mtd);
return mtd_ooblayout_ecc(part->parent, section, oobregion);
}
static int part_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct mtd_part *part = mtd_to_part(mtd);
return mtd_ooblayout_free(part->parent, section, oobregion);
}
static const struct mtd_ooblayout_ops part_ooblayout_ops = {
.ecc = part_ooblayout_ecc,
.free = part_ooblayout_free,
};
static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
{
struct mtd_part *part = mtd_to_part(mtd);
return part->parent->_max_bad_blocks(part->parent,
ofs + part->offset, len);
}
static inline void free_partition(struct mtd_part *p)
{
kfree(p->mtd.name);
kfree(p);
}
static struct mtd_part *allocate_partition(struct mtd_info *parent,
const struct mtd_partition *part, int partno,
uint64_t cur_offset)
static struct mtd_info *allocate_partition(struct mtd_info *parent,
const struct mtd_partition *part,
int partno, uint64_t cur_offset)
{
int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize :
parent->erasesize;
struct mtd_part *slave;
struct mtd_info *child, *master = mtd_get_master(parent);
u32 remainder;
char *name;
u64 tmp;
/* allocate the partition structure */
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
child = kzalloc(sizeof(*child), GFP_KERNEL);
name = kstrdup(part->name, GFP_KERNEL);
if (!name || !slave) {
if (!name || !child) {
printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
parent->name);
kfree(name);
kfree(slave);
kfree(child);
return ERR_PTR(-ENOMEM);
}
/* set up the MTD object for this partition */
slave->mtd.type = parent->type;
slave->mtd.flags = parent->orig_flags & ~part->mask_flags;
slave->mtd.orig_flags = slave->mtd.flags;
slave->mtd.size = part->size;
slave->mtd.writesize = parent->writesize;
slave->mtd.writebufsize = parent->writebufsize;
slave->mtd.oobsize = parent->oobsize;
slave->mtd.oobavail = parent->oobavail;
slave->mtd.subpage_sft = parent->subpage_sft;
slave->mtd.pairing = parent->pairing;
child->type = parent->type;
child->part.flags = parent->flags & ~part->mask_flags;
child->flags = child->part.flags;
child->size = part->size;
child->writesize = parent->writesize;
child->writebufsize = parent->writebufsize;
child->oobsize = parent->oobsize;
child->oobavail = parent->oobavail;
child->subpage_sft = parent->subpage_sft;
slave->mtd.name = name;
slave->mtd.owner = parent->owner;
child->name = name;
child->owner = parent->owner;
/* NOTE: Historically, we didn't arrange MTDs as a tree out of
* concern for showing the same data in multiple partitions.
@ -360,134 +73,76 @@ static struct mtd_part *allocate_partition(struct mtd_info *parent,
* so the MTD_PARTITIONED_MASTER option allows that. The master
* will have device nodes etc only if this is set, so make the
* parent conditional on that option. Note, this is a way to
* distinguish between the master and the partition in sysfs.
* distinguish between the parent and its partitions in sysfs.
*/
slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ?
&parent->dev :
parent->dev.parent;
slave->mtd.dev.of_node = part->of_node;
child->dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ?
&parent->dev : parent->dev.parent;
child->dev.of_node = part->of_node;
child->parent = parent;
child->part.offset = part->offset;
INIT_LIST_HEAD(&child->partitions);
if (parent->_read)
slave->mtd._read = part_read;
if (parent->_write)
slave->mtd._write = part_write;
if (parent->_panic_write)
slave->mtd._panic_write = part_panic_write;
if (parent->_point && parent->_unpoint) {
slave->mtd._point = part_point;
slave->mtd._unpoint = part_unpoint;
}
if (parent->_read_oob)
slave->mtd._read_oob = part_read_oob;
if (parent->_write_oob)
slave->mtd._write_oob = part_write_oob;
if (parent->_read_user_prot_reg)
slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
if (parent->_read_fact_prot_reg)
slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
if (parent->_write_user_prot_reg)
slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
if (parent->_lock_user_prot_reg)
slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
if (parent->_get_user_prot_info)
slave->mtd._get_user_prot_info = part_get_user_prot_info;
if (parent->_get_fact_prot_info)
slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
if (parent->_sync)
slave->mtd._sync = part_sync;
if (!partno && !parent->dev.class && parent->_suspend &&
parent->_resume) {
slave->mtd._suspend = part_suspend;
slave->mtd._resume = part_resume;
}
if (parent->_writev)
slave->mtd._writev = part_writev;
if (parent->_lock)
slave->mtd._lock = part_lock;
if (parent->_unlock)
slave->mtd._unlock = part_unlock;
if (parent->_is_locked)
slave->mtd._is_locked = part_is_locked;
if (parent->_block_isreserved)
slave->mtd._block_isreserved = part_block_isreserved;
if (parent->_block_isbad)
slave->mtd._block_isbad = part_block_isbad;
if (parent->_block_markbad)
slave->mtd._block_markbad = part_block_markbad;
if (parent->_max_bad_blocks)
slave->mtd._max_bad_blocks = part_max_bad_blocks;
if (parent->_get_device)
slave->mtd._get_device = part_get_device;
if (parent->_put_device)
slave->mtd._put_device = part_put_device;
slave->mtd._erase = part_erase;
slave->parent = parent;
slave->offset = part->offset;
if (slave->offset == MTDPART_OFS_APPEND)
slave->offset = cur_offset;
if (slave->offset == MTDPART_OFS_NXTBLK) {
if (child->part.offset == MTDPART_OFS_APPEND)
child->part.offset = cur_offset;
if (child->part.offset == MTDPART_OFS_NXTBLK) {
tmp = cur_offset;
slave->offset = cur_offset;
child->part.offset = cur_offset;
remainder = do_div(tmp, wr_alignment);
if (remainder) {
slave->offset += wr_alignment - remainder;
child->part.offset += wr_alignment - remainder;
printk(KERN_NOTICE "Moving partition %d: "
"0x%012llx -> 0x%012llx\n", partno,
(unsigned long long)cur_offset, (unsigned long long)slave->offset);
(unsigned long long)cur_offset,
child->part.offset);
}
}
if (slave->offset == MTDPART_OFS_RETAIN) {
slave->offset = cur_offset;
if (parent->size - slave->offset >= slave->mtd.size) {
slave->mtd.size = parent->size - slave->offset
- slave->mtd.size;
if (child->part.offset == MTDPART_OFS_RETAIN) {
child->part.offset = cur_offset;
if (parent->size - child->part.offset >= child->size) {
child->size = parent->size - child->part.offset -
child->size;
} else {
printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
part->name, parent->size - slave->offset,
slave->mtd.size);
part->name, parent->size - child->part.offset,
child->size);
/* register to preserve ordering */
goto out_register;
}
}
if (slave->mtd.size == MTDPART_SIZ_FULL)
slave->mtd.size = parent->size - slave->offset;
if (child->size == MTDPART_SIZ_FULL)
child->size = parent->size - child->part.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);
printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n",
child->part.offset, child->part.offset + child->size,
child->name);
/* let's do some sanity checks */
if (slave->offset >= parent->size) {
if (child->part.offset >= parent->size) {
/* let's register it anyway to preserve ordering */
slave->offset = 0;
slave->mtd.size = 0;
child->part.offset = 0;
child->size = 0;
/* Initialize ->erasesize to make add_mtd_device() happy. */
slave->mtd.erasesize = parent->erasesize;
child->erasesize = parent->erasesize;
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
part->name);
goto out_register;
}
if (slave->offset + slave->mtd.size > parent->size) {
slave->mtd.size = parent->size - slave->offset;
if (child->part.offset + child->size > parent->size) {
child->size = parent->size - child->part.offset;
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
part->name, parent->name, (unsigned long long)slave->mtd.size);
part->name, parent->name, child->size);
}
if (parent->numeraseregions > 1) {
/* Deal with variable erase size stuff */
int i, max = parent->numeraseregions;
u64 end = slave->offset + slave->mtd.size;
u64 end = child->part.offset + child->size;
struct mtd_erase_region_info *regions = parent->eraseregions;
/* Find the first erase regions which is part of this
* partition. */
for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
for (i = 0; i < max && regions[i].offset <= child->part.offset;
i++)
;
/* The loop searched for the region _behind_ the first one */
if (i > 0)
@ -495,70 +150,68 @@ static struct mtd_part *allocate_partition(struct mtd_info *parent,
/* 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 (child->erasesize < regions[i].erasesize)
child->erasesize = regions[i].erasesize;
}
}
BUG_ON(slave->mtd.erasesize == 0);
BUG_ON(child->erasesize == 0);
} else {
/* Single erase size */
slave->mtd.erasesize = parent->erasesize;
child->erasesize = parent->erasesize;
}
/*
* Slave erasesize might differ from the master one if the master
* Child erasesize might differ from the parent one if the parent
* exposes several regions with different erasesize. Adjust
* wr_alignment accordingly.
*/
if (!(slave->mtd.flags & MTD_NO_ERASE))
wr_alignment = slave->mtd.erasesize;
if (!(child->flags & MTD_NO_ERASE))
wr_alignment = child->erasesize;
tmp = part_absolute_offset(parent) + slave->offset;
tmp = mtd_get_master_ofs(child, 0);
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
if ((child->flags & MTD_WRITEABLE) && remainder) {
/* 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;
child->flags &= ~MTD_WRITEABLE;
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
part->name);
}
tmp = part_absolute_offset(parent) + slave->mtd.size;
tmp = mtd_get_master_ofs(child, 0) + child->size;
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
slave->mtd.flags &= ~MTD_WRITEABLE;
if ((child->flags & MTD_WRITEABLE) && remainder) {
child->flags &= ~MTD_WRITEABLE;
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
part->name);
}
mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
slave->mtd.ecc_step_size = parent->ecc_step_size;
slave->mtd.ecc_strength = parent->ecc_strength;
slave->mtd.bitflip_threshold = parent->bitflip_threshold;
child->ecc_step_size = parent->ecc_step_size;
child->ecc_strength = parent->ecc_strength;
child->bitflip_threshold = parent->bitflip_threshold;
if (parent->_block_isbad) {
if (master->_block_isbad) {
uint64_t offs = 0;
while (offs < slave->mtd.size) {
if (mtd_block_isreserved(parent, offs + slave->offset))
slave->mtd.ecc_stats.bbtblocks++;
else if (mtd_block_isbad(parent, offs + slave->offset))
slave->mtd.ecc_stats.badblocks++;
offs += slave->mtd.erasesize;
while (offs < child->size) {
if (mtd_block_isreserved(child, offs))
child->ecc_stats.bbtblocks++;
else if (mtd_block_isbad(child, offs))
child->ecc_stats.badblocks++;
offs += child->erasesize;
}
}
out_register:
return slave;
return child;
}
static ssize_t mtd_partition_offset_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mtd_info *mtd = dev_get_drvdata(dev);
struct mtd_part *part = mtd_to_part(mtd);
return snprintf(buf, PAGE_SIZE, "%llu\n", part->offset);
return snprintf(buf, PAGE_SIZE, "%lld\n", mtd->part.offset);
}
static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL);
@ -568,9 +221,9 @@ static const struct attribute *mtd_partition_attrs[] = {
NULL
};
static int mtd_add_partition_attrs(struct mtd_part *new)
static int mtd_add_partition_attrs(struct mtd_info *new)
{
int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs);
int ret = sysfs_create_files(&new->dev.kobj, mtd_partition_attrs);
if (ret)
printk(KERN_WARNING
"mtd: failed to create partition attrs, err=%d\n", ret);
@ -580,8 +233,9 @@ static int mtd_add_partition_attrs(struct mtd_part *new)
int mtd_add_partition(struct mtd_info *parent, const char *name,
long long offset, long long length)
{
struct mtd_info *master = mtd_get_master(parent);
struct mtd_partition part;
struct mtd_part *new;
struct mtd_info *child;
int ret = 0;
/* the direct offset is expected */
@ -600,28 +254,28 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
part.size = length;
part.offset = offset;
new = allocate_partition(parent, &part, -1, offset);
if (IS_ERR(new))
return PTR_ERR(new);
child = allocate_partition(parent, &part, -1, offset);
if (IS_ERR(child))
return PTR_ERR(child);
mutex_lock(&mtd_partitions_mutex);
list_add(&new->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
mutex_lock(&master->master.partitions_lock);
list_add_tail(&child->part.node, &parent->partitions);
mutex_unlock(&master->master.partitions_lock);
ret = add_mtd_device(&new->mtd);
ret = add_mtd_device(child);
if (ret)
goto err_remove_part;
mtd_add_partition_attrs(new);
mtd_add_partition_attrs(child);
return 0;
err_remove_part:
mutex_lock(&mtd_partitions_mutex);
list_del(&new->list);
mutex_unlock(&mtd_partitions_mutex);
mutex_lock(&master->master.partitions_lock);
list_del(&child->part.node);
mutex_unlock(&master->master.partitions_lock);
free_partition(new);
free_partition(child);
return ret;
}
@ -630,119 +284,142 @@ EXPORT_SYMBOL_GPL(mtd_add_partition);
/**
* __mtd_del_partition - delete MTD partition
*
* @priv: internal MTD struct for partition to be deleted
* @priv: MTD structure to be deleted
*
* This function must be called with the partitions mutex locked.
*/
static int __mtd_del_partition(struct mtd_part *priv)
static int __mtd_del_partition(struct mtd_info *mtd)
{
struct mtd_part *child, *next;
struct mtd_info *child, *next;
int err;
list_for_each_entry_safe(child, next, &mtd_partitions, list) {
if (child->parent == &priv->mtd) {
list_for_each_entry_safe(child, next, &mtd->partitions, part.node) {
err = __mtd_del_partition(child);
if (err)
return err;
}
}
sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs);
sysfs_remove_files(&mtd->dev.kobj, mtd_partition_attrs);
err = del_mtd_device(&priv->mtd);
err = del_mtd_device(mtd);
if (err)
return err;
list_del(&priv->list);
free_partition(priv);
list_del(&child->part.node);
free_partition(mtd);
return 0;
}
/*
* This function unregisters and destroy all slave MTD objects which are
* attached to the given MTD object.
* attached to the given MTD object, recursively.
*/
int del_mtd_partitions(struct mtd_info *mtd)
static int __del_mtd_partitions(struct mtd_info *mtd)
{
struct mtd_part *slave, *next;
struct mtd_info *child, *next;
LIST_HEAD(tmp_list);
int ret, err = 0;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
if (slave->parent == mtd) {
ret = __mtd_del_partition(slave);
if (ret < 0)
list_for_each_entry_safe(child, next, &mtd->partitions, part.node) {
if (mtd_has_partitions(child))
del_mtd_partitions(child);
pr_info("Deleting %s MTD partition\n", child->name);
ret = del_mtd_device(child);
if (ret < 0) {
pr_err("Error when deleting partition \"%s\" (%d)\n",
child->name, ret);
err = ret;
continue;
}
list_del(&child->part.node);
free_partition(child);
}
mutex_unlock(&mtd_partitions_mutex);
return err;
}
int del_mtd_partitions(struct mtd_info *mtd)
{
struct mtd_info *master = mtd_get_master(mtd);
int ret;
pr_info("Deleting MTD partitions on \"%s\":\n", mtd->name);
mutex_lock(&master->master.partitions_lock);
ret = __del_mtd_partitions(mtd);
mutex_unlock(&master->master.partitions_lock);
return ret;
}
int mtd_del_partition(struct mtd_info *mtd, int partno)
{
struct mtd_part *slave, *next;
struct mtd_info *child, *master = mtd_get_master(mtd);
int ret = -EINVAL;
mutex_lock(&mtd_partitions_mutex);
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
if ((slave->parent == mtd) &&
(slave->mtd.index == partno)) {
ret = __mtd_del_partition(slave);
mutex_lock(&master->master.partitions_lock);
list_for_each_entry(child, &mtd->partitions, part.node) {
if (child->index == partno) {
ret = __mtd_del_partition(child);
break;
}
mutex_unlock(&mtd_partitions_mutex);
}
mutex_unlock(&master->master.partitions_lock);
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
* the partition definitions.
* This function, given a parent MTD object and a partition table, creates
* and registers the child MTD objects which are bound to the parent according
* to the partition definitions.
*
* For historical reasons, this function's caller only registers the master
* For historical reasons, this function's caller only registers the parent
* if the MTD_PARTITIONED_MASTER config option is set.
*/
int add_mtd_partitions(struct mtd_info *master,
int add_mtd_partitions(struct mtd_info *parent,
const struct mtd_partition *parts,
int nbparts)
{
struct mtd_part *slave;
struct mtd_info *child, *master = mtd_get_master(parent);
uint64_t cur_offset = 0;
int i, ret;
printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n",
nbparts, parent->name);
for (i = 0; i < nbparts; i++) {
slave = allocate_partition(master, parts + i, i, cur_offset);
if (IS_ERR(slave)) {
ret = PTR_ERR(slave);
child = allocate_partition(parent, parts + i, i, cur_offset);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto err_del_partitions;
}
mutex_lock(&mtd_partitions_mutex);
list_add(&slave->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
mutex_lock(&master->master.partitions_lock);
list_add_tail(&child->part.node, &parent->partitions);
mutex_unlock(&master->master.partitions_lock);
ret = add_mtd_device(&slave->mtd);
ret = add_mtd_device(child);
if (ret) {
mutex_lock(&mtd_partitions_mutex);
list_del(&slave->list);
mutex_unlock(&mtd_partitions_mutex);
mutex_lock(&master->master.partitions_lock);
list_del(&child->part.node);
mutex_unlock(&master->master.partitions_lock);
free_partition(slave);
free_partition(child);
goto err_del_partitions;
}
mtd_add_partition_attrs(slave);
/* Look for subpartitions */
parse_mtd_partitions(&slave->mtd, parts[i].types, NULL);
mtd_add_partition_attrs(child);
cur_offset = slave->offset + slave->mtd.size;
/* Look for subpartitions */
parse_mtd_partitions(child, parts[i].types, NULL);
cur_offset = child->part.offset + child->size;
}
return 0;
@ -1023,29 +700,11 @@ void mtd_part_parser_cleanup(struct mtd_partitions *parts)
}
}
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;
struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd);
return mtd_get_device_size(mtd_to_part(mtd)->parent);
return master->size;
}
EXPORT_SYMBOL_GPL(mtd_get_device_size);

125
include/linux/mtd/mtd.h
View file

@ -8,6 +8,7 @@
#include <linux/types.h>
#include <linux/uio.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/of.h>
@ -194,10 +195,43 @@ struct mtd_debug_info {
const char *partid;
};
/**
* struct mtd_part - MTD partition specific fields
*
* @node: list node used to add an MTD partition to the parent partition list
* @offset: offset of the partition relatively to the parent offset
* @flags: original flags (before the mtdpart logic decided to tweak them based
* on flash constraints, like eraseblock/pagesize alignment)
*
* This struct is embedded in mtd_info and contains partition-specific
* properties/fields.
*/
struct mtd_part {
struct list_head node;
u64 offset;
u32 flags;
};
/**
* struct mtd_master - MTD master specific fields
*
* @partitions_lock: lock protecting accesses to the partition list. Protects
* not only the master partition list, but also all
* sub-partitions.
* @suspended: et to 1 when the device is suspended, 0 otherwise
*
* This struct is embedded in mtd_info and contains master-specific
* properties/fields. The master is the root MTD device from the MTD partition
* point of view.
*/
struct mtd_master {
struct mutex partitions_lock;
unsigned int suspended : 1;
};
struct mtd_info {
u_char type;
uint32_t flags;
uint32_t orig_flags; /* Flags as before running mtd checks */
uint64_t size; // Total size of the MTD
/* "Major" erase size for the device. Naïve users may take this
@ -339,7 +373,51 @@ struct mtd_info {
int usecount;
struct mtd_debug_info dbg;
struct nvmem_device *nvmem;
/*
* Parent device from the MTD partition point of view.
*
* MTD masters do not have any parent, MTD partitions do. The parent
* MTD device can itself be a partition.
*/
struct mtd_info *parent;
/* List of partitions attached to this MTD device */
struct list_head partitions;
union {
struct mtd_part part;
struct mtd_master master;
};
};
static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd)
{
while (mtd->parent)
mtd = mtd->parent;
return mtd;
}
static inline u64 mtd_get_master_ofs(struct mtd_info *mtd, u64 ofs)
{
while (mtd->parent) {
ofs += mtd->part.offset;
mtd = mtd->parent;
}
return ofs;
}
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);
@ -392,13 +470,16 @@ static inline u32 mtd_oobavail(struct mtd_info *mtd, struct mtd_oob_ops *ops)
static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
loff_t ofs, size_t len)
{
if (!mtd->_max_bad_blocks)
struct mtd_info *master = mtd_get_master(mtd);
if (!master->_max_bad_blocks)
return -ENOTSUPP;
if (mtd->size < (len + ofs) || ofs < 0)
return -EINVAL;
return mtd->_max_bad_blocks(mtd, ofs, len);
return master->_max_bad_blocks(master, mtd_get_master_ofs(mtd, ofs),
len);
}
int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
@ -439,8 +520,10 @@ int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
static inline void mtd_sync(struct mtd_info *mtd)
{
if (mtd->_sync)
mtd->_sync(mtd);
struct mtd_info *master = mtd_get_master(mtd);
if (master->_sync)
master->_sync(master);
}
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
@ -452,13 +535,31 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs);
static inline int mtd_suspend(struct mtd_info *mtd)
{
return mtd->_suspend ? mtd->_suspend(mtd) : 0;
struct mtd_info *master = mtd_get_master(mtd);
int ret;
if (master->master.suspended)
return 0;
ret = master->_suspend ? master->_suspend(master) : 0;
if (ret)
return ret;
master->master.suspended = 1;
return 0;
}
static inline void mtd_resume(struct mtd_info *mtd)
{
if (mtd->_resume)
mtd->_resume(mtd);
struct mtd_info *master = mtd_get_master(mtd);
if (!master->master.suspended)
return;
if (master->_resume)
master->_resume(master);
master->master.suspended = 0;
}
static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
@ -538,7 +639,9 @@ static inline loff_t mtd_wunit_to_offset(struct mtd_info *mtd, loff_t base,
static inline int mtd_has_oob(const struct mtd_info *mtd)
{
return mtd->_read_oob && mtd->_write_oob;
struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd);
return master->_read_oob && master->_write_oob;
}
static inline int mtd_type_is_nand(const struct mtd_info *mtd)
@ -548,7 +651,9 @@ static inline int mtd_type_is_nand(const struct mtd_info *mtd)
static inline int mtd_can_have_bb(const struct mtd_info *mtd)
{
return !!mtd->_block_isbad;
struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd);
return !!master->_block_isbad;
}
/* Kernel-side ioctl definitions */

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

@ -105,7 +105,6 @@ extern void deregister_mtd_parser(struct mtd_part_parser *parser);
module_driver(__mtd_part_parser, register_mtd_parser, \
deregister_mtd_parser)
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);