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ubi: allow to write to volume with offset

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Introduce ubi_volume_offset_write() helper, which
allow to write to ubi volume with specified offset.

Signed-off-by: Alexey Romanov <avromanov@salutedevices.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Acked-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
This commit is contained in:
Alexey Romanov
2024-07-18 08:45:24 +03:00
committed by Michael Trimarchi
parent cead69c528
commit 25ee9c2005
3 changed files with 75 additions and 9 deletions
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72
cmd/ubi.c
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@@ -423,9 +423,75 @@ int ubi_volume_begin_write(char *volume, void *buf, size_t size,
return ubi_volume_continue_write(volume, buf, size);
}
int ubi_volume_write(char *volume, void *buf, size_t size)
static int ubi_volume_offset_write(char *volume, void *buf, loff_t offset,
size_t size)
{
return ubi_volume_begin_write(volume, buf, size, size);
int len, tbuf_size, ret;
u64 lnum;
struct ubi_volume *vol;
loff_t off = offset;
void *tbuf;
vol = ubi_find_volume(volume);
if (!vol)
return -ENODEV;
if (size > vol->reserved_pebs * (ubi->leb_size - vol->data_pad))
return -EINVAL;
tbuf_size = vol->usable_leb_size;
tbuf = malloc_cache_aligned(tbuf_size);
if (!tbuf)
return -ENOMEM;
lnum = off;
off = do_div(lnum, vol->usable_leb_size);
do {
struct ubi_volume_desc desc = {
.vol = vol,
.mode = UBI_READWRITE,
};
len = size > tbuf_size ? tbuf_size : size;
if (off + len >= vol->usable_leb_size)
len = vol->usable_leb_size - off;
ret = ubi_read(&desc, (int)lnum, tbuf, 0, tbuf_size);
if (ret) {
pr_err("Failed to read leb %lld (%d)\n", lnum, ret);
goto exit;
}
memcpy(tbuf + off, buf, len);
ret = ubi_leb_change(&desc, (int)lnum, tbuf, tbuf_size);
if (ret) {
pr_err("Failed to write leb %lld (%d)\n", lnum, ret);
goto exit;
}
off += len;
if (off >= vol->usable_leb_size) {
lnum++;
off -= vol->usable_leb_size;
}
buf += len;
size -= len;
} while (size);
exit:
free(tbuf);
return ret;
}
int ubi_volume_write(char *volume, void *buf, loff_t offset, size_t size)
{
if (!offset)
return ubi_volume_begin_write(volume, buf, size, size);
return ubi_volume_offset_write(volume, buf, offset, size);
}
int ubi_volume_read(char *volume, char *buf, loff_t offset, size_t size)
@@ -769,7 +835,7 @@ static int do_ubi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
(void *)addr, size, full_size);
}
} else {
ret = ubi_volume_write(argv[3], (void *)addr, size);
ret = ubi_volume_write(argv[3], (void *)addr, 0, size);
}
if (!ret) {
printf("%lld bytes written to volume %s\n", size,