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mtd: harmonize mtd_writev usage 

This patch makes the 'mtd_writev()' function more usable and logical. We first
teach it to fall-back to the 'default_mtd_writev()' function if the MTD driver
does not define its own '->writev()' method. Then we make block2mtd and JFFS2
just 'mtd_writev()' instead of 'default_mtd_writev()' function. This means we
can now stop exporting 'default_mtd_writev()' and instead, export
'mtd_writev()'. This is much cleaner and more logical, as well as allows us to
get read of another direct 'mtd->writev' access in JFFS2.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2011-12-30 16:23:41 +02:00 committed by David Woodhouse
parent e2936b2af5
commit 1dbebd3256
4 changed files with 27 additions and 23 deletions
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2
drivers/mtd/devices/block2mtd.c
View File

@ -288,7 +288,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
dev->mtd.flags = MTD_CAP_RAM;
dev->mtd.erase = block2mtd_erase;
dev->mtd.write = block2mtd_write;
dev->mtd.writev = default_mtd_writev;
dev->mtd.writev = mtd_writev;
dev->mtd.sync = block2mtd_sync;
dev->mtd.read = block2mtd_read;
dev->mtd.priv = dev;

26
drivers/mtd/mtdcore.c
View File

@ -696,8 +696,8 @@ EXPORT_SYMBOL_GPL(__put_mtd_device);
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
unsigned long i;
size_t totlen = 0, thislen;
@ -716,7 +716,27 @@ int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
*retlen = totlen;
return ret;
}
EXPORT_SYMBOL_GPL(default_mtd_writev);
/*
* mtd_writev - the vector-based MTD write method
* @mtd: mtd device description object pointer
* @vecs: the vectors to write
* @count: count of vectors in @vecs
* @to: the MTD device offset to write to
* @retlen: on exit contains the count of bytes written to the MTD device.
*
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
*retlen = 0;
if (!mtd->writev)
return default_mtd_writev(mtd, vecs, count, to, retlen);
return mtd->writev(mtd, vecs, count, to, retlen);
}
EXPORT_SYMBOL_GPL(mtd_writev);
/**
* mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size

6
fs/jffs2/writev.c
View File

@ -26,11 +26,7 @@ int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
}
}
if (c->mtd->writev)
return mtd_writev(c->mtd, vecs, count, to, retlen);
else {
return default_mtd_writev(c->mtd, vecs, count, to, retlen);
}
return mtd_writev(c->mtd, vecs, count, to, retlen);
}
int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,

16
include/linux/mtd/mtd.h
View File

@ -394,16 +394,8 @@ static inline int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
return mtd->lock_user_prot_reg(mtd, from, len);
}
/*
* kvec-based read/write method. NB: The 'count' parameter is the number of
* _vectors_, each of which contains an (ofs, len) tuple.
*/
static inline int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
*retlen = 0;
return mtd->writev(mtd, vecs, count, to, retlen);
}
int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen);
static inline void mtd_sync(struct mtd_info *mtd)
{
@ -510,10 +502,6 @@ struct mtd_notifier {
extern void register_mtd_user (struct mtd_notifier *new);
extern int unregister_mtd_user (struct mtd_notifier *old);
int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen);
void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
void mtd_erase_callback(struct erase_info *instr);