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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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UBI: implement multiple volumes rename
Quite useful ioctl which allows to make atomic system upgrades. The idea belongs to Richard Titmuss <richard_titmuss@logitech.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
parent
c8566350a3
commit
f40ac9cdf6
6 changed files with 375 additions and 15 deletions
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@ -806,6 +806,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
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mutex_init(&ubi->buf_mutex);
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mutex_init(&ubi->ckvol_mutex);
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mutex_init(&ubi->mult_mutex);
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mutex_init(&ubi->volumes_mutex);
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spin_lock_init(&ubi->volumes_lock);
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@ -605,6 +605,166 @@ static int verify_rsvol_req(const struct ubi_device *ubi,
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return 0;
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}
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/**
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* rename_volumes - rename UBI volumes.
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* @ubi: UBI device description object
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* @req: volumes re-name request
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*
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* This is a helper function for the volume re-name IOCTL which validates the
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* the request, opens the volume and calls corresponding volumes management
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* function. Returns zero in case of success and a negative error code in case
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* of failure.
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*/
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static int rename_volumes(struct ubi_device *ubi,
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struct ubi_rnvol_req *req)
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{
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int i, n, err;
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struct list_head rename_list;
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struct ubi_rename_entry *re, *re1;
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if (req->count < 0 || req->count > UBI_MAX_RNVOL)
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return -EINVAL;
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if (req->count == 0)
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return 0;
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/* Validate volume IDs and names in the request */
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for (i = 0; i < req->count; i++) {
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if (req->ents[i].vol_id < 0 ||
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req->ents[i].vol_id >= ubi->vtbl_slots)
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return -EINVAL;
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if (req->ents[i].name_len < 0)
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return -EINVAL;
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if (req->ents[i].name_len > UBI_VOL_NAME_MAX)
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return -ENAMETOOLONG;
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req->ents[i].name[req->ents[i].name_len] = '\0';
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n = strlen(req->ents[i].name);
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if (n != req->ents[i].name_len)
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err = -EINVAL;
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}
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/* Make sure volume IDs and names are unique */
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for (i = 0; i < req->count - 1; i++) {
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for (n = i + 1; n < req->count; n++) {
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if (req->ents[i].vol_id == req->ents[n].vol_id) {
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dbg_err("duplicated volume id %d",
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req->ents[i].vol_id);
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return -EINVAL;
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}
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if (!strcmp(req->ents[i].name, req->ents[n].name)) {
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dbg_err("duplicated volume name \"%s\"",
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req->ents[i].name);
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return -EINVAL;
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}
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}
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}
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/* Create the re-name list */
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INIT_LIST_HEAD(&rename_list);
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for (i = 0; i < req->count; i++) {
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int vol_id = req->ents[i].vol_id;
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int name_len = req->ents[i].name_len;
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const char *name = req->ents[i].name;
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re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
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if (!re) {
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err = -ENOMEM;
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goto out_free;
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}
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re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
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if (IS_ERR(re->desc)) {
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err = PTR_ERR(re->desc);
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dbg_err("cannot open volume %d, error %d", vol_id, err);
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kfree(re);
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goto out_free;
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}
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/* Skip this re-naming if the name does not really change */
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if (re->desc->vol->name_len == name_len &&
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!memcmp(re->desc->vol->name, name, name_len)) {
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ubi_close_volume(re->desc);
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kfree(re);
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continue;
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}
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re->new_name_len = name_len;
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memcpy(re->new_name, name, name_len);
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list_add_tail(&re->list, &rename_list);
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dbg_msg("will rename volume %d from \"%s\" to \"%s\"",
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vol_id, re->desc->vol->name, name);
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}
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if (list_empty(&rename_list))
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return 0;
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/* Find out the volumes which have to be removed */
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list_for_each_entry(re, &rename_list, list) {
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struct ubi_volume_desc *desc;
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int no_remove_needed = 0;
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/*
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* Volume @re->vol_id is going to be re-named to
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* @re->new_name, while its current name is @name. If a volume
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* with name @re->new_name currently exists, it has to be
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* removed, unless it is also re-named in the request (@req).
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*/
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list_for_each_entry(re1, &rename_list, list) {
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if (re->new_name_len == re1->desc->vol->name_len &&
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!memcmp(re->new_name, re1->desc->vol->name,
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re1->desc->vol->name_len)) {
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no_remove_needed = 1;
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break;
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}
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}
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if (no_remove_needed)
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continue;
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/*
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* It seems we need to remove volume with name @re->new_name,
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* if it exists.
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*/
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desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, UBI_EXCLUSIVE);
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if (IS_ERR(desc)) {
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err = PTR_ERR(desc);
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if (err == -ENODEV)
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/* Re-naming into a non-existing volume name */
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continue;
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/* The volume exists but busy, or an error occurred */
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dbg_err("cannot open volume \"%s\", error %d",
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re->new_name, err);
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goto out_free;
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}
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re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
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if (!re) {
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err = -ENOMEM;
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ubi_close_volume(desc);
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goto out_free;
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}
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re->remove = 1;
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re->desc = desc;
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list_add(&re->list, &rename_list);
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dbg_msg("will remove volume %d, name \"%s\"",
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re->desc->vol->vol_id, re->desc->vol->name);
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}
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mutex_lock(&ubi->volumes_mutex);
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err = ubi_rename_volumes(ubi, &rename_list);
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mutex_unlock(&ubi->volumes_mutex);
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out_free:
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list_for_each_entry_safe(re, re1, &rename_list, list) {
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ubi_close_volume(re->desc);
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list_del(&re->list);
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kfree(re);
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}
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return err;
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}
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static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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@ -670,7 +830,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
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}
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mutex_lock(&ubi->volumes_mutex);
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err = ubi_remove_volume(desc);
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err = ubi_remove_volume(desc, 0);
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mutex_unlock(&ubi->volumes_mutex);
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/*
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@ -717,6 +877,32 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
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break;
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}
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/* Re-name volumes command */
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case UBI_IOCRNVOL:
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{
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struct ubi_rnvol_req *req;
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dbg_msg("re-name volumes");
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req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
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if (!req) {
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err = -ENOMEM;
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break;
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};
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err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
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if (err) {
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err = -EFAULT;
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kfree(req);
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break;
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}
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mutex_lock(&ubi->mult_mutex);
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err = rename_volumes(ubi, req);
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mutex_unlock(&ubi->mult_mutex);
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kfree(req);
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break;
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}
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default:
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err = -ENOTTY;
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break;
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@ -131,6 +131,27 @@ struct ubi_ltree_entry {
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struct rw_semaphore mutex;
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};
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/**
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* struct ubi_rename_entry - volume re-name description data structure.
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* @new_name_len: new volume name length
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* @new_name: new volume name
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* @remove: if not zero, this volume should be removed, not re-named
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* @desc: descriptor of the volume
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* @list: links re-name entries into a list
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*
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* This data structure is utilized in the multiple volume re-name code. Namely,
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* UBI first creates a list of &struct ubi_rename_entry objects from the
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* &struct ubi_rnvol_req request object, and then utilizes this list to do all
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* the job.
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*/
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struct ubi_rename_entry {
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int new_name_len;
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char new_name[UBI_VOL_NAME_MAX + 1];
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int remove;
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struct ubi_volume_desc *desc;
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struct list_head list;
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};
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struct ubi_volume_desc;
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/**
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@ -206,7 +227,7 @@ struct ubi_volume {
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int alignment;
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int data_pad;
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int name_len;
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char name[UBI_VOL_NAME_MAX+1];
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char name[UBI_VOL_NAME_MAX + 1];
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int upd_ebs;
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int ch_lnum;
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@ -272,7 +293,7 @@ struct ubi_wl_entry;
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* @vtbl_size: size of the volume table in bytes
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* @vtbl: in-RAM volume table copy
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* @volumes_mutex: protects on-flash volume table and serializes volume
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* changes, like creation, deletion, update, resize
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* changes, like creation, deletion, update, re-size and re-name
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*
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* @max_ec: current highest erase counter value
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* @mean_ec: current mean erase counter value
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@ -330,6 +351,8 @@ struct ubi_wl_entry;
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* @peb_buf1: a buffer of PEB size used for different purposes
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* @peb_buf2: another buffer of PEB size used for different purposes
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* @buf_mutex: proptects @peb_buf1 and @peb_buf2
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* @ckvol_mutex: serializes static volume checking when opening
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* @mult_mutex: serializes operations on multiple volumes, like re-nameing
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* @dbg_peb_buf: buffer of PEB size used for debugging
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* @dbg_buf_mutex: proptects @dbg_peb_buf
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*/
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@ -410,6 +433,7 @@ struct ubi_device {
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void *peb_buf2;
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struct mutex buf_mutex;
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struct mutex ckvol_mutex;
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struct mutex mult_mutex;
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#ifdef CONFIG_MTD_UBI_DEBUG
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void *dbg_peb_buf;
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struct mutex dbg_buf_mutex;
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@ -426,12 +450,15 @@ extern struct mutex ubi_devices_mutex;
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/* vtbl.c */
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int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
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struct ubi_vtbl_record *vtbl_rec);
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int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
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struct list_head *rename_list);
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int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_scan_info *si);
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/* vmt.c */
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int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req);
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int ubi_remove_volume(struct ubi_volume_desc *desc);
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int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl);
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int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs);
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int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list);
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int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol);
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void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol);
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@ -402,13 +402,14 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
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/**
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* ubi_remove_volume - remove volume.
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* @desc: volume descriptor
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* @no_vtbl: do not change volume table if not zero
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*
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* This function removes volume described by @desc. The volume has to be opened
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* in "exclusive" mode. Returns zero in case of success and a negative error
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* code in case of failure. The caller has to have the @ubi->volumes_mutex
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* locked.
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*/
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int ubi_remove_volume(struct ubi_volume_desc *desc)
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int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
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{
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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@ -437,9 +438,11 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
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if (err)
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goto out_err;
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if (!no_vtbl) {
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err = ubi_change_vtbl_record(ubi, vol_id, NULL);
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if (err)
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goto out_err;
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}
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for (i = 0; i < vol->reserved_pebs; i++) {
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err = ubi_eba_unmap_leb(ubi, vol, i);
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@ -465,6 +468,7 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
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ubi->vol_count -= 1;
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spin_unlock(&ubi->volumes_lock);
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if (!no_vtbl)
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err = paranoid_check_volumes(ubi);
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return err;
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@ -601,6 +605,44 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
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return err;
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}
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/**
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* ubi_rename_volumes - re-name UBI volumes.
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* @ubi: UBI device description object
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* @renam_list: list of &struct ubi_rename_entry objects
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*
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* This function re-names or removes volumes specified in the re-name list.
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* Returns zero in case of success and a negative error code in case of
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* failure.
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*/
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int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
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{
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int err;
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struct ubi_rename_entry *re;
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err = ubi_vtbl_rename_volumes(ubi, rename_list);
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if (err)
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return err;
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list_for_each_entry(re, rename_list, list) {
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if (re->remove) {
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err = ubi_remove_volume(re->desc, 1);
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if (err)
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break;
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} else {
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struct ubi_volume *vol = re->desc->vol;
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spin_lock(&ubi->volumes_lock);
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vol->name_len = re->new_name_len;
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memcpy(vol->name, re->new_name, re->new_name_len + 1);
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spin_unlock(&ubi->volumes_lock);
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}
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}
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if (!err)
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paranoid_check_volumes(ubi);
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return err;
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}
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/**
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* ubi_add_volume - add volume.
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* @ubi: UBI device description object
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@ -826,10 +868,9 @@ static int paranoid_check_volume(struct ubi_device *ubi, int vol_id)
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fail:
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ubi_err("paranoid check failed for volume %d", vol_id);
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if (vol) {
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if (vol)
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ubi_dbg_dump_vol_info(vol);
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ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
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}
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spin_unlock(&ubi->volumes_lock);
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return -EINVAL;
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}
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@ -114,6 +114,57 @@ int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
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return 0;
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}
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/**
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* ubi_vtbl_rename_volumes - rename UBI volumes in the volume table.
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* @ubi: UBI device description object
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* @renam_list: list of &struct ubi_rename_entry objects
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*
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* This function re-names multiple volumes specified in @req in the volume
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* table. Returns zero in case of success and a negative error code in case of
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* failure.
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*/
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int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
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struct list_head *rename_list)
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{
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int i, err;
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struct ubi_rename_entry *re;
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struct ubi_volume *layout_vol;
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list_for_each_entry(re, rename_list, list) {
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uint32_t crc;
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struct ubi_volume *vol = re->desc->vol;
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struct ubi_vtbl_record *vtbl_rec = &ubi->vtbl[vol->vol_id];
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if (re->remove) {
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memcpy(vtbl_rec, &empty_vtbl_record,
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sizeof(struct ubi_vtbl_record));
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continue;
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}
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vtbl_rec->name_len = cpu_to_be16(re->new_name_len);
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memcpy(vtbl_rec->name, re->new_name, re->new_name_len);
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memset(vtbl_rec->name + re->new_name_len, 0,
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UBI_VOL_NAME_MAX + 1 - re->new_name_len);
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crc = crc32(UBI_CRC32_INIT, vtbl_rec,
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UBI_VTBL_RECORD_SIZE_CRC);
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vtbl_rec->crc = cpu_to_be32(crc);
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}
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|
||||
layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOLUME_ID)];
|
||||
for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
|
||||
err = ubi_eba_unmap_leb(ubi, layout_vol, i);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = ubi_eba_write_leb(ubi, layout_vol, i, ubi->vtbl, 0,
|
||||
ubi->vtbl_size, UBI_LONGTERM);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* vtbl_check - check if volume table is not corrupted and contains sensible
|
||||
* data.
|
||||
|
|
|
|||
|
|
@ -58,6 +58,13 @@
|
|||
* device should be used. A &struct ubi_rsvol_req object has to be properly
|
||||
* filled and a pointer to it has to be passed to the IOCTL.
|
||||
*
|
||||
* UBI volumes re-name
|
||||
* ~~~~~~~~~~~~~~~~~~~
|
||||
*
|
||||
* To re-name several volumes atomically at one go, the %UBI_IOCRNVOL command
|
||||
* of the UBI character device should be used. A &struct ubi_rnvol_req object
|
||||
* has to be properly filled and a pointer to it has to be passed to the IOCTL.
|
||||
*
|
||||
* UBI volume update
|
||||
* ~~~~~~~~~~~~~~~~~
|
||||
*
|
||||
|
|
@ -104,6 +111,8 @@
|
|||
#define UBI_IOCRMVOL _IOW(UBI_IOC_MAGIC, 1, int32_t)
|
||||
/* Re-size an UBI volume */
|
||||
#define UBI_IOCRSVOL _IOW(UBI_IOC_MAGIC, 2, struct ubi_rsvol_req)
|
||||
/* Re-name volumes */
|
||||
#define UBI_IOCRNVOL _IOW(UBI_IOC_MAGIC, 3, struct ubi_rnvol_req)
|
||||
|
||||
/* IOCTL commands of the UBI control character device */
|
||||
|
||||
|
|
@ -128,6 +137,9 @@
|
|||
/* Maximum MTD device name length supported by UBI */
|
||||
#define MAX_UBI_MTD_NAME_LEN 127
|
||||
|
||||
/* Maximum amount of UBI volumes that can be re-named at one go */
|
||||
#define UBI_MAX_RNVOL 32
|
||||
|
||||
/*
|
||||
* UBI data type hint constants.
|
||||
*
|
||||
|
|
@ -189,7 +201,7 @@ struct ubi_attach_req {
|
|||
int32_t ubi_num;
|
||||
int32_t mtd_num;
|
||||
int32_t vid_hdr_offset;
|
||||
uint8_t padding[12];
|
||||
int8_t padding[12];
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -250,6 +262,48 @@ struct ubi_rsvol_req {
|
|||
int32_t vol_id;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/**
|
||||
* struct ubi_rnvol_req - volumes re-name request.
|
||||
* @count: count of volumes to re-name
|
||||
* @padding1: reserved for future, not used, has to be zeroed
|
||||
* @vol_id: ID of the volume to re-name
|
||||
* @name_len: name length
|
||||
* @padding2: reserved for future, not used, has to be zeroed
|
||||
* @name: new volume name
|
||||
*
|
||||
* UBI allows to re-name up to %32 volumes at one go. The count of volumes to
|
||||
* re-name is specified in the @count field. The ID of the volumes to re-name
|
||||
* and the new names are specified in the @vol_id and @name fields.
|
||||
*
|
||||
* The UBI volume re-name operation is atomic, which means that should power cut
|
||||
* happen, the volumes will have either old name or new name. So the possible
|
||||
* use-cases of this command is atomic upgrade. Indeed, to upgrade, say, volumes
|
||||
* A and B one may create temporary volumes %A1 and %B1 with the new contents,
|
||||
* then atomically re-name A1->A and B1->B, in which case old %A and %B will
|
||||
* be removed.
|
||||
*
|
||||
* If it is not desirable to remove old A and B, the re-name request has to
|
||||
* contain 4 entries: A1->A, A->A1, B1->B, B->B1, in which case old A1 and B1
|
||||
* become A and B, and old A and B will become A1 and B1.
|
||||
*
|
||||
* It is also OK to request: A1->A, A1->X, B1->B, B->Y, in which case old A1
|
||||
* and B1 become A and B, and old A and B become X and Y.
|
||||
*
|
||||
* In other words, in case of re-naming into an existing volume name, the
|
||||
* existing volume is removed, unless it is re-named as well at the same
|
||||
* re-name request.
|
||||
*/
|
||||
struct ubi_rnvol_req {
|
||||
int32_t count;
|
||||
int8_t padding1[12];
|
||||
struct {
|
||||
int32_t vol_id;
|
||||
int16_t name_len;
|
||||
int8_t padding2[2];
|
||||
char name[UBI_MAX_VOLUME_NAME + 1];
|
||||
} ents[UBI_MAX_RNVOL];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/**
|
||||
* struct ubi_leb_change_req - a data structure used in atomic logical
|
||||
* eraseblock change requests.
|
||||
|
|
@ -261,8 +315,8 @@ struct ubi_rsvol_req {
|
|||
struct ubi_leb_change_req {
|
||||
int32_t lnum;
|
||||
int32_t bytes;
|
||||
uint8_t dtype;
|
||||
uint8_t padding[7];
|
||||
int8_t dtype;
|
||||
int8_t padding[7];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
#endif /* __UBI_USER_H__ */
|
||||
|
|
|
|||
Loading…
Reference in a new issue