From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-in-10.arcor-online.net ([151.189.21.50]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1boTX6-0006zq-JW for barebox@lists.infradead.org; Mon, 26 Sep 2016 10:53:16 +0000 Received: from mail-in-18-z2.arcor-online.net (mail-in-18-z2.arcor-online.net [151.189.8.35]) by mx.arcor.de (Postfix) with ESMTP id 3sjLQl69cmz2f3R for ; Mon, 26 Sep 2016 12:52:47 +0200 (CEST) From: Giorgio Dal Molin Date: Mon, 26 Sep 2016 12:52:32 +0200 Message-Id: <20160926105233.26387-2-iw3gtf@arcor.de> In-Reply-To: <20160926105233.26387-1-iw3gtf@arcor.de> References: <20160926105233.26387-1-iw3gtf@arcor.de> In-Reply-To: <20160926061912.elzmjbs4mdv5ztrb@pengutronix.de> References: <20160926061912.elzmjbs4mdv5ztrb@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/2] mtd: ubi: add API call to rename volumes. To: barebox@lists.infradead.org Cc: Giorgio Dal Molin Signed-off-by: Giorgio Dal Molin --- drivers/mtd/ubi/barebox.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/mtd/ubi/vmt.c | 3 + include/linux/mtd/ubi.h | 1 + 3 files changed, 160 insertions(+) diff --git a/drivers/mtd/ubi/barebox.c b/drivers/mtd/ubi/barebox.c index 23c4bfd..329cf45 100644 --- a/drivers/mtd/ubi/barebox.c +++ b/drivers/mtd/ubi/barebox.c @@ -280,6 +280,162 @@ int ubi_api_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) return ubi_remove_volume(desc, no_vtbl); } +int ubi_api_rename_volumes(int ubi_num, struct ubi_rnvol_req *req) +{ + int i, n, err; + struct list_head rename_list; + struct ubi_rename_entry *re, *re1; + struct ubi_device *ubi; + + if (req->count < 0 || req->count > UBI_MAX_RNVOL) + return -EINVAL; + + if (req->count == 0) + return 0; + + ubi = ubi_get_device(ubi_num); + if (!ubi) + return -ENODEV; + + /* 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) + return -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) { + ubi_err(ubi, "duplicated volume id %d", + req->ents[i].vol_id); + return -EINVAL; + } + if (!strcmp(req->ents[i].name, req->ents[n].name)) { + ubi_err(ubi, "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_READONLY); + if (IS_ERR(re->desc)) { + err = PTR_ERR(re->desc); + ubi_err(ubi, "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_gen("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 */ + ubi_err(ubi, "cannot open volume \"%s\", error %d", + re->new_name, err); + goto out_free; + } + + re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); + if (!re1) { + err = -ENOMEM; + ubi_close_volume(desc); + goto out_free; + } + + re1->remove = 1; + re1->desc = desc; + list_add(&re1->list, &rename_list); + dbg_gen("will remove volume %d, name \"%s\"", + re1->desc->vol->vol_id, re1->desc->vol->name); + } + + mutex_lock(&ubi->device_mutex); + err = ubi_rename_volumes(ubi, &rename_list); + mutex_unlock(&ubi->device_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 cdev *cdev, int cmd, void *buf) { struct ubi_device *ubi = cdev->priv; diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c index 41b814c..ed04364 100644 --- a/drivers/mtd/ubi/vmt.c +++ b/drivers/mtd/ubi/vmt.c @@ -411,6 +411,9 @@ int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) vol->name_len = re->new_name_len; memcpy(vol->name, re->new_name, re->new_name_len + 1); + free(vol->cdev.name); + vol->cdev.name = basprintf("%s.%s", ubi->cdev.name, vol->name); + vol->cdev.size = vol->used_bytes; ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED); } } diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h index c72f95b..c215ff2 100644 --- a/include/linux/mtd/ubi.h +++ b/include/linux/mtd/ubi.h @@ -220,6 +220,7 @@ int ubi_flush(int ubi_num, int vol_id, int lnum); int ubi_api_create_volume(int ubi_num, struct ubi_mkvol_req *req); int ubi_api_remove_volume(struct ubi_volume_desc *desc, int no_vtbl); +int ubi_api_rename_volumes(int ubi_num, struct ubi_rnvol_req *req); /* * This function is the same as the 'ubi_leb_read()' function, but it does not -- 2.10.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox