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nand-bb: implement lseek in readonly mode 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Robert Jarzmik <robert.jarzmik@free.fr>
This commit is contained in:
Sascha Hauer 2011-12-11 13:10:44 +01:00
parent 4ecd0003ac
commit 597ce4cc1c
1 changed files with 35 additions and 0 deletions
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35
drivers/mtd/nand/nand-bb.c
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@ -45,6 +45,7 @@ struct nand_bb {
size_t raw_size;
size_t size;
off_t offset;
unsigned long flags;
void *writebuf;
struct cdev cdev;
@ -171,6 +172,7 @@ static int nand_bb_open(struct cdev *cdev, unsigned long flags)
if (bb->open)
return -EBUSY;
bb->flags = flags;
bb->open = 1;
bb->offset = 0;
bb->needs_write = 0;
@ -211,10 +213,43 @@ static int nand_bb_calc_size(struct nand_bb *bb)
return 0;
}
static off_t nand_bb_lseek(struct cdev *cdev, off_t __offset)
{
struct nand_bb *bb = cdev->priv;
unsigned long raw_pos = 0;
uint32_t offset = __offset;
int ret;
/* lseek only in readonly mode */
if (bb->flags & O_ACCMODE)
return -ENOSYS;
while (raw_pos < bb->raw_size) {
off_t now = min(offset, bb->info.erasesize);
ret = cdev_ioctl(bb->cdev_parent, MEMGETBADBLOCK, (void *)raw_pos);
if (ret < 0)
return ret;
if (!ret) {
offset -= now;
raw_pos += now;
} else {
raw_pos += bb->info.erasesize;
}
if (!offset) {
bb->offset = raw_pos;
return __offset;
}
}
return -EINVAL;
}
static struct file_operations nand_bb_ops = {
.open = nand_bb_open,
.close = nand_bb_close,
.read = nand_bb_read,
.lseek = nand_bb_lseek,
#ifdef CONFIG_NAND_WRITE
.write = nand_bb_write,
.erase = nand_bb_erase,