/**
* do_sync_erase - synchronously erase a physical eraseblock.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to erase
*
* This function synchronously erases physical eraseblock @pnum and returns
* zero in case of success and a negative error code in case of failure. If
* %-EIO is returned, the physical eraseblock most probably went bad.
*/
static int do_sync_erase(struct ubi_device *ubi, int pnum)
{
int err, retries = 0;
struct erase_info ei;
wait_queue_head_t wq;
dbg_io("erase PEB %d", pnum);
retry:
init_waitqueue_head(&wq);
memset(&ei, 0, sizeof(struct erase_info));
ei.mtd = ubi->mtd;
ei.addr = (loff_t)pnum * ubi->peb_size;
ei.len = ubi->peb_size;
ei.callback = erase_callback;
ei.priv = (unsigned long)&wq;
err = ubi->mtd->erase(ubi->mtd, &ei);
if (err) {
if (retries++ < UBI_IO_RETRIES) {
dbg_io("error %d while erasing PEB %d, retry",
err, pnum);
yield();
goto retry;
}
ubi_err("cannot erase PEB %d, error %d", pnum, err);
ubi_dbg_dump_stack();
return err;
}
err = wait_event_interruptible(wq, ei.state == MTD_ERASE_DONE ||
ei.state == MTD_ERASE_FAILED);
if (err) {
ubi_err("interrupted PEB %d erasure", pnum);
return -EINTR;
}
if (ei.state == MTD_ERASE_FAILED) {
if (retries++ < UBI_IO_RETRIES) {
dbg_io("error while erasing PEB %d, retry", pnum);
yield();
goto retry;
}
ubi_err("cannot erase PEB %d", pnum);
ubi_dbg_dump_stack();
return -EIO;
}
err = ubi_dbg_check_all_ff(ubi, pnum, 0, ubi->peb_size);
if (err)
return err;
if (ubi_dbg_is_erase_failure() && !err) {
dbg_err("cannot erase PEB %d (emulated)", pnum);
return -EIO;
}
return 0;
}
/**
* ubi_io_write - write data to a physical eraseblock.
* @ubi: UBI device description object
* @buf: buffer with the data to write
* @pnum: physical eraseblock number to write to
* @offset: offset within the physical eraseblock where to write
* @len: how many bytes to write
*
* This function writes @len bytes of data from buffer @buf to offset @offset
* of physical eraseblock @pnum. If all the data were successfully written,
* zero is returned. If an error occurred, this function returns a negative
* error code. If %-EIO is returned, the physical eraseblock most probably went
* bad.
*
* Note, in case of an error, it is possible that something was still written
* to the flash media, but may be some garbage.
*/
int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
int len)
{
int err;
size_t written;
loff_t addr;
dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
ubi_assert(offset >= 0 && offset + len <= ubi->peb_size);
ubi_assert(offset % ubi->hdrs_min_io_size == 0);
ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0);
if (ubi->ro_mode) {
ubi_err("read-only mode");
return -EROFS;
}
/* The below has to be compiled out if paranoid checks are disabled */
err = paranoid_check_not_bad(ubi, pnum);
if (err)
return err;
/* The area we are writing to has to contain all 0xFF bytes */
err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
if (err)
return err;
if (offset >= ubi->leb_start) {
/*
* We write to the data area of the physical eraseblock. Make
* sure it has valid EC and VID headers.
*/
err = paranoid_check_peb_ec_hdr(ubi, pnum);
if (err)
return err;
err = paranoid_check_peb_vid_hdr(ubi, pnum);
if (err)
return err;
}
if (ubi_dbg_is_write_failure()) {
dbg_err("cannot write %d bytes to PEB %d:%d "
"(emulated)", len, pnum, offset);
ubi_dbg_dump_stack();
return -EIO;
}
addr = (loff_t)pnum * ubi->peb_size + offset;
err = ubi->mtd->write(ubi->mtd, addr, len, &written, buf);
if (err) {
ubi_err("error %d while writing %d bytes to PEB %d:%d, written "
"%zd bytes", err, len, pnum, offset, written);
ubi_dbg_dump_stack();
ubi_dbg_dump_flash(ubi, pnum, offset, len);
} else
ubi_assert(written == len);
if (!err) {
err = ubi_dbg_check_write(ubi, buf, pnum, offset, len);
if (err)
return err;
/*
* Since we always write sequentially, the rest of the PEB has
* to contain only 0xFF bytes.
*/
offset += len;
len = ubi->peb_size - offset;
if (len)
err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
}
return err;
}
/**
* ubi_io_write - write data to a physical eraseblock.
* @ubi: UBI device description object
* @buf: buffer with the data to write
* @pnum: physical eraseblock number to write to
* @offset: offset within the physical eraseblock where to write
* @len: how many bytes to write
*
* This function writes @len bytes of data from buffer @buf to offset @offset
* of physical eraseblock @pnum. If all the data were successfully written,
* zero is returned. If an error occurred, this function returns a negative
* error code. If %-EIO is returned, the physical eraseblock most probably went
* bad.
*
* Note, in case of an error, it is possible that something was still written
* to the flash media, but may be some garbage.
*/
int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
int len)
{
int err;
size_t written;
loff_t addr;
#ifdef CONFIG_MTD_MSM_NAND
void *buf_new;
#endif
dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
ubi_assert(offset >= 0 && offset + len <= ubi->peb_size);
ubi_assert(offset % ubi->hdrs_min_io_size == 0);
ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0);
if (ubi->ro_mode) {
ubi_err("read-only mode");
return -EROFS;
}
/* The below has to be compiled out if paranoid checks are disabled */
err = paranoid_check_not_bad(ubi, pnum);
if (err)
return err > 0 ? -EINVAL : err;
/* The area we are writing to has to contain all 0xFF bytes */
err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
if (err)
return err > 0 ? -EINVAL : err;
if (offset >= ubi->leb_start) {
/*
* We write to the data area of the physical eraseblock. Make
* sure it has valid EC and VID headers.
*/
err = paranoid_check_peb_ec_hdr(ubi, pnum);
if (err)
return err > 0 ? -EINVAL : err;
err = paranoid_check_peb_vid_hdr(ubi, pnum);
if (err)
return err > 0 ? -EINVAL : err;
}
if (ubi_dbg_is_write_failure()) {
dbg_err("cannot write %d bytes to PEB %d:%d "
"(emulated)", len, pnum, offset);
ubi_dbg_dump_stack();
return -EIO;
}
addr = (loff_t)pnum * ubi->peb_size + offset;
#ifdef CONFIG_MTD_MSM_NAND
if(!(buf_new = kmalloc(len, GFP_KERNEL | __GFP_NOFAIL)))
return -ENOMEM;
memcpy(buf_new, buf, len);
err = ubi->mtd->write(ubi->mtd, addr, len, &written, buf_new);
#else
err = ubi->mtd->write(ubi->mtd, addr, len, &written, buf);
#endif
if (err) {
ubi_err("error %d while writing %d bytes to PEB %d:%d, written "
"%zd bytes", err, len, pnum, offset, written);
ubi_dbg_dump_stack();
ubi_dbg_dump_flash(ubi, pnum, offset, len);
} else
ubi_assert(written == len);
#ifdef CONFIG_MTD_MSM_NAND
kfree(buf_new);
#endif
return err;
}
