*
* Major and minor numbers are assigned dynamically to both UBI and volume
* character devices.
+ *
+ * Well, there is the third kind of character devices - the UBI control
+ * character device, which allows to manipulate by UBI devices - create and
+ * delete them. In other words, it is used for attaching and detaching MTD
+ * devices.
*/
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/ioctl.h>
#include <linux/capability.h>
+#include <linux/uaccess.h>
+#include <linux/smp_lock.h>
#include <mtd/ubi-user.h>
-#include <asm/uaccess.h>
#include <asm/div64.h>
#include "ubi.h"
-/*
- * Maximum sequence numbers of UBI and volume character device IOCTLs (direct
- * logical eraseblock erase is a debug-only feature).
- */
-#define UBI_CDEV_IOC_MAX_SEQ 2
-#ifndef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
-#define VOL_CDEV_IOC_MAX_SEQ 1
-#else
-#define VOL_CDEV_IOC_MAX_SEQ 2
-#endif
-
-/**
- * major_to_device - get UBI device object by character device major number.
- * @major: major number
- *
- * This function returns a pointer to the UBI device object.
- */
-static struct ubi_device *major_to_device(int major)
-{
- int i;
-
- for (i = 0; i < ubi_devices_cnt; i++)
- if (ubi_devices[i] && ubi_devices[i]->major == major)
- return ubi_devices[i];
- BUG();
- return NULL;
-}
-
/**
* get_exclusive - get exclusive access to an UBI volume.
* @desc: volume descriptor
static int vol_cdev_open(struct inode *inode, struct file *file)
{
struct ubi_volume_desc *desc;
- const struct ubi_device *ubi = major_to_device(imajor(inode));
- int vol_id = iminor(inode) - 1;
- int mode;
+ int vol_id = iminor(inode) - 1, mode, ubi_num;
+
+ lock_kernel();
+ ubi_num = ubi_major2num(imajor(inode));
+ if (ubi_num < 0) {
+ unlock_kernel();
+ return ubi_num;
+ }
if (file->f_mode & FMODE_WRITE)
mode = UBI_READWRITE;
else
mode = UBI_READONLY;
- dbg_msg("open volume %d, mode %d", vol_id, mode);
+ dbg_gen("open volume %d, mode %d", vol_id, mode);
- desc = ubi_open_volume(ubi->ubi_num, vol_id, mode);
+ desc = ubi_open_volume(ubi_num, vol_id, mode);
+ unlock_kernel();
if (IS_ERR(desc))
return PTR_ERR(desc);
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
- dbg_msg("release volume %d, mode %d", vol->vol_id, desc->mode);
+ dbg_gen("release volume %d, mode %d", vol->vol_id, desc->mode);
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_gen("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);
return -EINVAL;
}
- dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld",
+ dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld",
vol->vol_id, offset, origin, new_offset);
file->f_pos = new_offset;
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
- int err, lnum, off, len, vol_id = desc->vol->vol_id, tbuf_size;
+ int err, lnum, off, len, tbuf_size;
size_t count_save = count;
void *tbuf;
uint64_t tmp;
- dbg_msg("read %zd bytes from offset %lld of volume %d",
- count, *offp, vol_id);
+ dbg_gen("read %zd bytes from offset %lld of volume %d",
+ count, *offp, vol->vol_id);
if (vol->updating) {
dbg_err("updating");
return 0;
if (vol->corrupted)
- dbg_msg("read from corrupted volume %d", vol_id);
+ dbg_gen("read from corrupted volume %d", vol->vol_id);
if (*offp + count > vol->used_bytes)
count_save = count = vol->used_bytes - *offp;
if (off + len >= vol->usable_leb_size)
len = vol->usable_leb_size - off;
- err = ubi_eba_read_leb(ubi, vol_id, lnum, tbuf, off, len, 0);
+ err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
if (err)
break;
struct ubi_volume_desc *desc = file->private_data;
struct ubi_volume *vol = desc->vol;
struct ubi_device *ubi = vol->ubi;
- int lnum, off, len, tbuf_size, vol_id = vol->vol_id, err = 0;
+ int lnum, off, len, tbuf_size, err = 0;
size_t count_save = count;
char *tbuf;
uint64_t tmp;
- dbg_msg("requested: write %zd bytes to offset %lld of volume %u",
- count, *offp, desc->vol->vol_id);
+ dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
+ count, *offp, vol->vol_id);
if (vol->vol_type == UBI_STATIC_VOLUME)
return -EROFS;
off = do_div(tmp, vol->usable_leb_size);
lnum = tmp;
- if (off % ubi->min_io_size) {
+ if (off & (ubi->min_io_size - 1)) {
dbg_err("unaligned position");
return -EINVAL;
}
count_save = count = vol->used_bytes - *offp;
/* We can write only in fractions of the minimum I/O unit */
- if (count % ubi->min_io_size) {
+ if (count & (ubi->min_io_size - 1)) {
dbg_err("unaligned write length");
return -EINVAL;
}
break;
}
- err = ubi_eba_write_leb(ubi, vol_id, lnum, tbuf, off, len,
+ err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len,
UBI_UNKNOWN);
if (err)
break;
}
#else
-#define vol_cdev_direct_write(file, buf, count, offp) -EPERM
+#define vol_cdev_direct_write(file, buf, count, offp) (-EPERM)
#endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */
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->vol_id, 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", count);
+ 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;
+ if (vol->changing_leb) {
+ revoke_exclusive(desc, UBI_READWRITE);
+ return count;
+ }
+
err = ubi_check_volume(ubi, vol->vol_id);
if (err < 0)
return err;
revoke_exclusive(desc, UBI_READWRITE);
}
- *offp += count;
return count;
}
break;
}
- rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad);
+ rsvd_bytes = (long long)vol->reserved_pebs *
+ ubi->leb_size-vol->data_pad;
if (bytes < 0 || bytes > rsvd_bytes) {
err = -EINVAL;
break;
if (err < 0)
break;
- err = ubi_start_update(ubi, vol->vol_id, bytes);
+ err = ubi_start_update(ubi, vol, bytes);
if (bytes == 0)
revoke_exclusive(desc, UBI_READWRITE);
+ break;
+ }
+
+ /* Atomic logical eraseblock change command */
+ case UBI_IOCEBCH:
+ {
+ struct ubi_leb_change_req req;
- file->f_pos = 0;
+ 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;
}
break;
}
- if (desc->mode == UBI_READONLY) {
+ if (desc->mode == UBI_READONLY ||
+ vol->vol_type == UBI_STATIC_VOLUME) {
err = -EROFS;
break;
}
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->vol_id, lnum);
+ dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
+ err = ubi_eba_unmap_leb(ubi, vol, lnum);
if (err)
break;
if (req->alignment > ubi->leb_size)
goto bad;
- n = req->alignment % ubi->min_io_size;
+ n = req->alignment & (ubi->min_io_size - 1);
if (req->alignment != 1 && n)
goto bad;
goto bad;
}
+ n = strnlen(req->name, req->name_len + 1);
+ if (n != req->name_len)
+ goto bad;
+
return 0;
bad:
return 0;
}
+/**
+ * rename_volumes - rename UBI volumes.
+ * @ubi: UBI device description object
+ * @req: volumes re-name request
+ *
+ * This is a helper function for the volume re-name IOCTL which validates the
+ * the request, opens the volume and calls corresponding volumes management
+ * function. Returns zero in case of success and a negative error code in case
+ * of failure.
+ */
+static int rename_volumes(struct ubi_device *ubi,
+ struct ubi_rnvol_req *req)
+{
+ int i, n, err;
+ struct list_head rename_list;
+ struct ubi_rename_entry *re, *re1;
+
+ if (req->count < 0 || req->count > UBI_MAX_RNVOL)
+ return -EINVAL;
+
+ if (req->count == 0)
+ return 0;
+
+ /* Validate volume IDs and names in the request */
+ for (i = 0; i < req->count; i++) {
+ if (req->ents[i].vol_id < 0 ||
+ req->ents[i].vol_id >= ubi->vtbl_slots)
+ return -EINVAL;
+ if (req->ents[i].name_len < 0)
+ return -EINVAL;
+ if (req->ents[i].name_len > UBI_VOL_NAME_MAX)
+ return -ENAMETOOLONG;
+ req->ents[i].name[req->ents[i].name_len] = '\0';
+ n = strlen(req->ents[i].name);
+ if (n != req->ents[i].name_len)
+ err = -EINVAL;
+ }
+
+ /* Make sure volume IDs and names are unique */
+ for (i = 0; i < req->count - 1; i++) {
+ for (n = i + 1; n < req->count; n++) {
+ if (req->ents[i].vol_id == req->ents[n].vol_id) {
+ dbg_err("duplicated volume id %d",
+ req->ents[i].vol_id);
+ return -EINVAL;
+ }
+ if (!strcmp(req->ents[i].name, req->ents[n].name)) {
+ dbg_err("duplicated volume name \"%s\"",
+ req->ents[i].name);
+ return -EINVAL;
+ }
+ }
+ }
+
+ /* Create the re-name list */
+ INIT_LIST_HEAD(&rename_list);
+ for (i = 0; i < req->count; i++) {
+ int vol_id = req->ents[i].vol_id;
+ int name_len = req->ents[i].name_len;
+ const char *name = req->ents[i].name;
+
+ re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
+ if (!re) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
+ if (IS_ERR(re->desc)) {
+ err = PTR_ERR(re->desc);
+ dbg_err("cannot open volume %d, error %d", vol_id, err);
+ kfree(re);
+ goto out_free;
+ }
+
+ /* Skip this re-naming if the name does not really change */
+ if (re->desc->vol->name_len == name_len &&
+ !memcmp(re->desc->vol->name, name, name_len)) {
+ ubi_close_volume(re->desc);
+ kfree(re);
+ continue;
+ }
+
+ re->new_name_len = name_len;
+ memcpy(re->new_name, name, name_len);
+ list_add_tail(&re->list, &rename_list);
+ dbg_msg("will rename volume %d from \"%s\" to \"%s\"",
+ vol_id, re->desc->vol->name, name);
+ }
+
+ if (list_empty(&rename_list))
+ return 0;
+
+ /* Find out the volumes which have to be removed */
+ list_for_each_entry(re, &rename_list, list) {
+ struct ubi_volume_desc *desc;
+ int no_remove_needed = 0;
+
+ /*
+ * Volume @re->vol_id is going to be re-named to
+ * @re->new_name, while its current name is @name. If a volume
+ * with name @re->new_name currently exists, it has to be
+ * removed, unless it is also re-named in the request (@req).
+ */
+ list_for_each_entry(re1, &rename_list, list) {
+ if (re->new_name_len == re1->desc->vol->name_len &&
+ !memcmp(re->new_name, re1->desc->vol->name,
+ re1->desc->vol->name_len)) {
+ no_remove_needed = 1;
+ break;
+ }
+ }
+
+ if (no_remove_needed)
+ continue;
+
+ /*
+ * It seems we need to remove volume with name @re->new_name,
+ * if it exists.
+ */
+ desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, UBI_EXCLUSIVE);
+ if (IS_ERR(desc)) {
+ err = PTR_ERR(desc);
+ if (err == -ENODEV)
+ /* Re-naming into a non-existing volume name */
+ continue;
+
+ /* The volume exists but busy, or an error occurred */
+ dbg_err("cannot open volume \"%s\", error %d",
+ re->new_name, err);
+ goto out_free;
+ }
+
+ re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
+ if (!re) {
+ err = -ENOMEM;
+ ubi_close_volume(desc);
+ goto out_free;
+ }
+
+ re->remove = 1;
+ re->desc = desc;
+ list_add(&re->list, &rename_list);
+ dbg_msg("will remove volume %d, name \"%s\"",
+ re->desc->vol->vol_id, re->desc->vol->name);
+ }
+
+ mutex_lock(&ubi->volumes_mutex);
+ err = ubi_rename_volumes(ubi, &rename_list);
+ mutex_unlock(&ubi->volumes_mutex);
+
+out_free:
+ list_for_each_entry_safe(re, re1, &rename_list, list) {
+ ubi_close_volume(re->desc);
+ list_del(&re->list);
+ kfree(re);
+ }
+ return err;
+}
+
static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- ubi = major_to_device(imajor(inode));
- if (IS_ERR(ubi))
- return PTR_ERR(ubi);
+ ubi = ubi_get_by_major(imajor(inode));
+ if (!ubi)
+ return -ENODEV;
switch (cmd) {
/* Create volume command */
{
struct ubi_mkvol_req req;
- dbg_msg("create volume");
- err = copy_from_user(&req, argp,
- sizeof(struct ubi_mkvol_req));
+ dbg_gen("create volume");
+ err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
if (err) {
err = -EFAULT;
break;
}
+ req.name[req.name_len] = '\0';
err = verify_mkvol_req(ubi, &req);
if (err)
break;
- req.name[req.name_len] = '\0';
-
+ mutex_lock(&ubi->volumes_mutex);
err = ubi_create_volume(ubi, &req);
+ mutex_unlock(&ubi->volumes_mutex);
if (err)
break;
{
int vol_id;
- dbg_msg("remove volume");
+ dbg_gen("remove volume");
err = get_user(vol_id, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
- err = ubi_remove_volume(desc);
- if (err)
- ubi_close_volume(desc);
+ mutex_lock(&ubi->volumes_mutex);
+ err = ubi_remove_volume(desc, 0);
+ mutex_unlock(&ubi->volumes_mutex);
+ /*
+ * The volume is deleted (unless an error occurred), and the
+ * 'struct ubi_volume' object will be freed when
+ * 'ubi_close_volume()' will call 'put_device()'.
+ */
+ ubi_close_volume(desc);
break;
}
uint64_t tmp;
struct ubi_rsvol_req req;
- dbg_msg("re-size volume");
- err = copy_from_user(&req, argp,
- sizeof(struct ubi_rsvol_req));
+ dbg_gen("re-size volume");
+ err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
if (err) {
err = -EFAULT;
break;
pebs = !!do_div(tmp, desc->vol->usable_leb_size);
pebs += tmp;
+ mutex_lock(&ubi->volumes_mutex);
err = ubi_resize_volume(desc, pebs);
+ mutex_unlock(&ubi->volumes_mutex);
ubi_close_volume(desc);
break;
}
+ /* Re-name volumes command */
+ case UBI_IOCRNVOL:
+ {
+ struct ubi_rnvol_req *req;
+
+ dbg_msg("re-name volumes");
+ req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
+ if (!req) {
+ err = -ENOMEM;
+ break;
+ };
+
+ err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
+ if (err) {
+ err = -EFAULT;
+ kfree(req);
+ break;
+ }
+
+ mutex_lock(&ubi->mult_mutex);
+ err = rename_volumes(ubi, req);
+ mutex_unlock(&ubi->mult_mutex);
+ kfree(req);
+ break;
+ }
+
default:
err = -ENOTTY;
break;
}
+ ubi_put_device(ubi);
return err;
}
+static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int err = 0;
+ void __user *argp = (void __user *)arg;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ switch (cmd) {
+ /* Attach an MTD device command */
+ case UBI_IOCATT:
+ {
+ struct ubi_attach_req req;
+ struct mtd_info *mtd;
+
+ dbg_gen("attach MTD device");
+ err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
+ if (err) {
+ err = -EFAULT;
+ break;
+ }
+
+ if (req.mtd_num < 0 ||
+ (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
+ err = -EINVAL;
+ break;
+ }
+
+ mtd = get_mtd_device(NULL, req.mtd_num);
+ if (IS_ERR(mtd)) {
+ err = PTR_ERR(mtd);
+ break;
+ }
+
+ /*
+ * Note, further request verification is done by
+ * 'ubi_attach_mtd_dev()'.
+ */
+ mutex_lock(&ubi_devices_mutex);
+ err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
+ mutex_unlock(&ubi_devices_mutex);
+ if (err < 0)
+ put_mtd_device(mtd);
+ else
+ /* @err contains UBI device number */
+ err = put_user(err, (__user int32_t *)argp);
+
+ break;
+ }
+
+ /* Detach an MTD device command */
+ case UBI_IOCDET:
+ {
+ int ubi_num;
+
+ dbg_gen("dettach MTD device");
+ err = get_user(ubi_num, (__user int32_t *)argp);
+ if (err) {
+ err = -EFAULT;
+ break;
+ }
+
+ mutex_lock(&ubi_devices_mutex);
+ err = ubi_detach_mtd_dev(ubi_num, 0);
+ mutex_unlock(&ubi_devices_mutex);
+ break;
+ }
+
+ default:
+ err = -ENOTTY;
+ break;
+ }
+
+ return err;
+}
+
+/* UBI control character device operations */
+struct file_operations ubi_ctrl_cdev_operations = {
+ .ioctl = ctrl_cdev_ioctl,
+ .owner = THIS_MODULE,
+};
+
/* UBI character device operations */
struct file_operations ubi_cdev_operations = {
.owner = THIS_MODULE,
projects / deliverable / linux.git / blobdiff