*/
/*
- * 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
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);
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
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
* @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,
return err;
err = ubi_wl_flush(ubi);
if (err == 0) {
+ vol->updating = 0;
err = to_write;
vfree(vol->upd_buf);
}
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;
+}
projects / linux-2.6 / blobdiff