UBI: implement atomic LEB change ioctl
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
Родитель
866136827b
Коммит
e653879c26
|
|
@ -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)
|
||||
|
|
|
|||
|
|
@ -158,15 +158,23 @@ struct ubi_volume_desc;
|
|||
* @name: volume name
|
||||
*
|
||||
* @upd_ebs: how many eraseblocks are expected to be updated
|
||||
* @upd_bytes: how many bytes are expected to be received
|
||||
* @upd_received: how many update bytes were already received
|
||||
* @upd_buf: update buffer which is used to collect update data
|
||||
* @ch_lnum: LEB number which is being changing by the atomic LEB change
|
||||
* operation
|
||||
* @ch_dtype: data persistency type which is being changing by the atomic LEB
|
||||
* change operation
|
||||
* @upd_bytes: how many bytes are expected to be received for volume update or
|
||||
* atomic LEB change
|
||||
* @upd_received: how many bytes were already received for volume update or
|
||||
* atomic LEB change
|
||||
* @upd_buf: update buffer which is used to collect update data or data for
|
||||
* atomic LEB change
|
||||
*
|
||||
* @eba_tbl: EBA table of this volume (LEB->PEB mapping)
|
||||
* @checked: %1 if this static volume was checked
|
||||
* @corrupted: %1 if the volume is corrupted (static volumes only)
|
||||
* @upd_marker: %1 if the update marker is set for this volume
|
||||
* @updating: %1 if the volume is being updated
|
||||
* @changing_leb: %1 if the atomic LEB change ioctl command is in progress
|
||||
*
|
||||
* @gluebi_desc: gluebi UBI volume descriptor
|
||||
* @gluebi_refcount: reference count of the gluebi MTD device
|
||||
|
|
@ -202,6 +210,8 @@ struct ubi_volume {
|
|||
char name[UBI_VOL_NAME_MAX+1];
|
||||
|
||||
int upd_ebs;
|
||||
int ch_lnum;
|
||||
int ch_dtype;
|
||||
long long upd_bytes;
|
||||
long long upd_received;
|
||||
void *upd_buf;
|
||||
|
|
@ -211,9 +221,14 @@ struct ubi_volume {
|
|||
int corrupted:1;
|
||||
int upd_marker:1;
|
||||
int updating:1;
|
||||
int changing_leb:1;
|
||||
|
||||
#ifdef CONFIG_MTD_UBI_GLUEBI
|
||||
/* Gluebi-related stuff may be compiled out */
|
||||
/*
|
||||
* Gluebi-related stuff may be compiled out.
|
||||
* TODO: this should not be built into UBI but should be a separate
|
||||
* ubimtd driver which works on top of UBI and emulates MTD devices.
|
||||
*/
|
||||
struct ubi_volume_desc *gluebi_desc;
|
||||
int gluebi_refcount;
|
||||
struct mtd_info gluebi_mtd;
|
||||
|
|
@ -427,6 +442,10 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
long long bytes);
|
||||
int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
|
||||
const void __user *buf, int count);
|
||||
int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
|
||||
const struct ubi_leb_change_req *req);
|
||||
int ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol,
|
||||
const void __user *buf, int count);
|
||||
|
||||
/* misc.c */
|
||||
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf, int length);
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
}
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче