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UBI: implement atomic LEB change ioctl

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Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
2008-01-24 18:48:21 +02:00
parent 866136827b
commit e653879c26
3 changed files with 183 additions and 28 deletions
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112
drivers/mtd/ubi/upd.c
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@ -22,7 +22,8 @@
*/
/*
* This file contains implementation of the volume update functionality.
* This file contains implementation of the volume update and atomic LEB change
* functionality.
*
* The update operation is based on the per-volume update marker which is
* stored in the volume table. The update marker is set before the update
@ -133,6 +134,7 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
uint64_t tmp;
dbg_msg("start update of volume %d, %llu bytes", vol->vol_id, bytes);
ubi_assert(!vol->updating && !vol->changing_leb);
vol->updating = 1;
err = set_update_marker(ubi, vol);
@ -167,6 +169,39 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
return 0;
}
/**
* ubi_start_leb_change - start atomic LEB change.
* @ubi: UBI device description object
* @vol: volume description object
* @req: operation request
*
* This function starts atomic LEB change operation. Returns zero in case of
* success and a negative error code in case of failure.
*/
int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
const struct ubi_leb_change_req *req)
{
ubi_assert(!vol->updating && !vol->changing_leb);
dbg_msg("start changing LEB %d:%d, %u bytes",
vol->vol_id, req->lnum, req->bytes);
if (req->bytes == 0)
return ubi_eba_atomic_leb_change(ubi, vol, req->lnum, NULL, 0,
req->dtype);
vol->upd_bytes = req->bytes;
vol->upd_received = 0;
vol->changing_leb = 1;
vol->ch_lnum = req->lnum;
vol->ch_dtype = req->dtype;
vol->upd_buf = vmalloc(req->bytes);
if (!vol->upd_buf)
return -ENOMEM;
return 0;
}
/**
* write_leb - write update data.
* @ubi: UBI device description object
@ -199,21 +234,19 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
static int write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
void *buf, int len, int used_ebs)
{
int err, l;
int err;
if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
l = ALIGN(len, ubi->min_io_size);
memset(buf + len, 0xFF, l - len);
len = ALIGN(len, ubi->min_io_size);
memset(buf + len, 0xFF, len - len);
l = ubi_calc_data_len(ubi, buf, l);
if (l == 0) {
len = ubi_calc_data_len(ubi, buf, len);
if (len == 0) {
dbg_msg("all %d bytes contain 0xFF - skip", len);
return 0;
}
if (len != l)
dbg_msg("skip last %d bytes (0xFF)", len - l);
err = ubi_eba_write_leb(ubi, vol, lnum, buf, 0, l, UBI_UNKNOWN);
err = ubi_eba_write_leb(ubi, vol, lnum, buf, 0, len, UBI_UNKNOWN);
} else {
/*
* When writing static volume, and this is the last logical
@ -239,9 +272,9 @@ static int write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
* @count: how much bytes to write
*
* This function writes more data to the volume which is being updated. It may
* be called arbitrary number of times until all of the update data arrive.
* This function returns %0 in case of success, number of bytes written during
* the last call if the whole volume update was successfully finished, and a
* be called arbitrary number of times until all the update data arriveis. This
* function returns %0 in case of success, number of bytes written during the
* last call if the whole volume update has been successfully finished, and a
* negative error code in case of failure.
*/
int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
@ -340,6 +373,7 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
return err;
err = ubi_wl_flush(ubi);
if (err == 0) {
vol->updating = 0;
err = to_write;
vfree(vol->upd_buf);
}
@ -347,3 +381,57 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
return err;
}
/**
* ubi_more_leb_change_data - accept more data for atomic LEB change.
* @vol: volume description object
* @buf: write data (user-space memory buffer)
* @count: how much bytes to write
*
* This function accepts more data to the volume which is being under the
* "atomic LEB change" operation. It may be called arbitrary number of times
* until all data arrives. This function returns %0 in case of success, number
* of bytes written during the last call if the whole "atomic LEB change"
* operation has been successfully finished, and a negative error code in case
* of failure.
*/
int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
const void __user *buf, int count)
{
int err;
dbg_msg("write %d of %lld bytes, %lld already passed",
count, vol->upd_bytes, vol->upd_received);
if (ubi->ro_mode)
return -EROFS;
if (vol->upd_received + count > vol->upd_bytes)
count = vol->upd_bytes - vol->upd_received;
err = copy_from_user(vol->upd_buf + vol->upd_received, buf, count);
if (err)
return -EFAULT;
vol->upd_received += count;
if (vol->upd_received == vol->upd_bytes) {
int len = ALIGN((int)vol->upd_bytes, ubi->min_io_size);
memset(vol->upd_buf + vol->upd_bytes, 0xFF, len - vol->upd_bytes);
len = ubi_calc_data_len(ubi, vol->upd_buf, len);
err = ubi_eba_atomic_leb_change(ubi, vol, vol->ch_lnum,
vol->upd_buf, len, UBI_UNKNOWN);
if (err)
return err;
}
ubi_assert(vol->upd_received <= vol->upd_bytes);
if (vol->upd_received == vol->upd_bytes) {
vol->changing_leb = 0;
err = count;
vfree(vol->upd_buf);
}
return err;
}