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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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72
drivers/mtd/ubi/cdev.c
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@@ -132,8 +132,15 @@ static int vol_cdev_release(struct inode *inode, struct file *file)
if (vol->updating) {
ubi_warn("update of volume %d not finished, volume is damaged",
vol->vol_id);
ubi_assert(!vol->changing_leb);
vol->updating = 0;
vfree(vol->upd_buf);
} else if (vol->changing_leb) {
dbg_msg("only %lld of %lld bytes received for atomic LEB change"
" for volume %d:%d, cancel", vol->upd_received,
vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id);
vol->changing_leb = 0;
vfree(vol->upd_buf);
}
ubi_close_volume(desc);
@@ -351,24 +358,32 @@ static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
if (!vol->updating)
if (!vol->updating && !vol->changing_leb)
return vol_cdev_direct_write(file, buf, count, offp);
err = ubi_more_update_data(ubi, vol, buf, count);
if (vol->updating)
err = ubi_more_update_data(ubi, vol, buf, count);
else
err = ubi_more_leb_change_data(ubi, vol, buf, count);
if (err < 0) {
ubi_err("cannot write %zd bytes of update data, error %d",
ubi_err("cannot accept more %zd bytes of data, error %d",
count, err);
return err;
}
if (err) {
/*
* Update is finished, @err contains number of actually written
* bytes now.
* The operation is finished, @err contains number of actually
* written bytes.
*/
count = err;
vol->updating = 0;
if (vol->changing_leb) {
revoke_exclusive(desc, UBI_READWRITE);
return count;
}
err = ubi_check_volume(ubi, vol->vol_id);
if (err < 0)
return err;
@@ -433,6 +448,43 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
/* Atomic logical eraseblock change command */
case UBI_IOCEBCH:
{
struct ubi_leb_change_req req;
err = copy_from_user(&req, argp,
sizeof(struct ubi_leb_change_req));
if (err) {
err = -EFAULT;
break;
}
if (desc->mode == UBI_READONLY ||
vol->vol_type == UBI_STATIC_VOLUME) {
err = -EROFS;
break;
}
/* Validate the request */
err = -EINVAL;
if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
req.bytes < 0 || req.lnum >= vol->usable_leb_size)
break;
if (req.dtype != UBI_LONGTERM && req.dtype != UBI_SHORTTERM &&
req.dtype != UBI_UNKNOWN)
break;
err = get_exclusive(desc);
if (err < 0)
break;
err = ubi_start_leb_change(ubi, vol, &req);
if (req.bytes == 0)
revoke_exclusive(desc, UBI_READWRITE);
break;
}
#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
/* Logical eraseblock erasure command */
case UBI_IOCEBER:
@@ -445,7 +497,8 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
if (desc->mode == UBI_READONLY) {
if (desc->mode == UBI_READONLY ||
vol->vol_type == UBI_STATIC_VOLUME) {
err = -EROFS;
break;
}
@@ -455,11 +508,6 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
if (vol->vol_type != UBI_DYNAMIC_VOLUME) {
err = -EROFS;
break;
}
dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
err = ubi_eba_unmap_leb(ubi, vol, lnum);
if (err)