/**
* ubi_io_write_vid_hdr - write a volume identifier header.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to write to
* @vidb: the volume identifier buffer to write
*
* This function writes the volume identifier header described by @vid_hdr to
* physical eraseblock @pnum. This function automatically fills the
* @vidb->hdr->magic and the @vidb->hdr->version fields, as well as calculates
* header CRC checksum and stores it at vidb->hdr->hdr_crc.
*
* This function returns zero in case of success and a negative error code in
* case of failure. If %-EIO is returned, the physical eraseblock probably went
* bad.
*/
int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
struct ubi_vid_io_buf *vidb)
{
struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb);
int err;
uint32_t crc;
void *p = vidb->buffer;
dbg_io("write VID header to PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
err = self_check_peb_ec_hdr(ubi, pnum);
if (err)
return err;
vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC);
vid_hdr->version = UBI_VERSION;
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
vid_hdr->hdr_crc = cpu_to_be32(crc);
err = self_check_vid_hdr(ubi, pnum, vid_hdr);
if (err)
return err;
if (ubi_dbg_power_cut(ubi, POWER_CUT_VID_WRITE))
return -EROFS;
err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
return err;
}
/**
* ubi_io_write_vid_hdr - write a volume identifier header.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to write to
* @vid_hdr: the volume identifier header to write
*
* This function writes the volume identifier header described by @vid_hdr to
* physical eraseblock @pnum. This function automatically fills the
* @vid_hdr->magic and the @vid_hdr->version fields, as well as calculates
* header CRC checksum and stores it at vid_hdr->hdr_crc.
*
* This function returns zero in case of success and a negative error code in
* case of failure. If %-EIO is returned, the physical eraseblock probably went
* bad.
*/
int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
struct ubi_vid_hdr *vid_hdr)
{
int err;
uint32_t crc;
void *p;
dbg_io("write VID header to PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
err = self_check_peb_ec_hdr(ubi, pnum);
if (err)
return err;
vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC);
vid_hdr->version = UBI_VERSION;
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
vid_hdr->hdr_crc = cpu_to_be32(crc);
err = self_check_vid_hdr(ubi, pnum, vid_hdr);
if (err)
return err;
p = (char *)vid_hdr - ubi->vid_hdr_shift;
err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
return err;
}
/**
* ubi_io_write_vid_hdr - write a volume identifier header.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to write to
* @vid_hdr: the volume identifier header to write
*
* This function writes the volume identifier header described by @vid_hdr to
* physical eraseblock @pnum. This function automatically fills the
* @vid_hdr->magic and the @vid_hdr->version fields, as well as calculates
* header CRC checksum and stores it at vid_hdr->hdr_crc.
*
* This function returns zero in case of success and a negative error code in
* case of failure. If %-EIO is returned, the physical eraseblock probably went
* bad.
*/
int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
struct ubi_vid_hdr *vid_hdr)
{
int err;
uint32_t crc;
void *p;
dbg_io("write VID header to PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
err = self_check_peb_ec_hdr(ubi, pnum);
if (err)
return err;
vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC);
vid_hdr->version = UBI_VERSION;
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
vid_hdr->hdr_crc = cpu_to_be32(crc);
err = self_check_vid_hdr(ubi, pnum, vid_hdr);
if (err)
return err;
#ifdef CONFIG_BLB
{
extern int blb_record_page1(struct ubi_device *ubi, int pnum,
struct ubi_vid_hdr *vid_hdr, int);
int vol_id = be32_to_cpu(vid_hdr->vol_id);
if(vol_id < UBI_INTERNAL_VOL_START) {
lockdep_off();
blb_record_page1(ubi, pnum, vid_hdr, 0);
lockdep_on();
}
}
#endif
p = (char *)vid_hdr - ubi->vid_hdr_shift;
err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
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;
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(ubi, "read-only mode");
return -EROFS;
}
err = self_check_not_bad(ubi, pnum);
if (err)
return err;
/* The area we are writing to has to contain all 0xFF bytes */
err = ubi_self_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 = self_check_peb_ec_hdr(ubi, pnum);
if (err)
return err;
err = self_check_peb_vid_hdr(ubi, pnum);
if (err)
return err;
}
if (ubi_dbg_is_write_failure(ubi)) {
ubi_err(ubi, "cannot write %d bytes to PEB %d:%d (emulated)",
len, pnum, offset);
dump_stack();
return -EIO;
}
addr = (loff_t)pnum * ubi->peb_size + offset;
err = mtd_write(ubi->mtd, addr, len, &written, buf);
if (err) {
ubi_err(ubi, "error %d while writing %d bytes to PEB %d:%d, written %zd bytes",
err, len, pnum, offset, written);
dump_stack();
ubi_dump_flash(ubi, pnum, offset, len);
} else
ubi_assert(written == len);
if (!err) {
err = self_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_self_check_all_ff(ubi, pnum, offset, len);
}
return err;
}
