diff options
Diffstat (limited to 'target/linux/generic/patches-3.10/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch')
| -rw-r--r-- | target/linux/generic/patches-3.10/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch | 829 |
1 files changed, 0 insertions, 829 deletions
diff --git a/target/linux/generic/patches-3.10/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch b/target/linux/generic/patches-3.10/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch deleted file mode 100644 index b629466d93..0000000000 --- a/target/linux/generic/patches-3.10/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch +++ /dev/null @@ -1,829 +0,0 @@ -From 9d54c8a33eec78289b1b3f6e10874719c27ce0a7 Mon Sep 17 00:00:00 2001 -From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> -Date: Tue, 25 Feb 2014 13:25:22 -0300 -Subject: [PATCH] UBI: R/O block driver on top of UBI volumes - -This commit introduces read-only block device emulation on top of UBI volumes. - -Given UBI takes care of wear leveling and bad block management it's possible -to add a thin layer to enable block device access to UBI volumes. -This allows to use a block-oriented filesystem on a flash device. - -The UBI block devices are meant to be used in conjunction with any -regular, block-oriented file system (e.g. ext4), although it's primarily -targeted at read-only file systems, such as squashfs. - -Block devices are created upon user request through new ioctls: -UBI_IOCVOLATTBLK to attach and UBI_IOCVOLDETBLK to detach. -Also, a new UBI module parameter is added 'ubi.block'. This parameter is -needed in order to attach a block device on boot-up time, allowing to -mount the rootfs on a ubiblock device. -For instance, you could have these kernel parameters: - - ubi.mtd=5 ubi.block=0,0 root=/dev/ubiblock0_0 - -Or, if you compile ubi as a module: - - $ modprobe ubi mtd=/dev/mtd5 block=/dev/ubi0_0 - -Artem: amend commentaries and massage the patch a little bit. - -Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> -Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> ---- - drivers/mtd/ubi/Kconfig | 15 + - drivers/mtd/ubi/Makefile | 1 + - drivers/mtd/ubi/block.c | 646 ++++++++++++++++++++++++++++++++++++++++++++ - drivers/mtd/ubi/build.c | 11 + - drivers/mtd/ubi/cdev.c | 20 ++ - drivers/mtd/ubi/ubi.h | 14 + - include/uapi/mtd/ubi-user.h | 11 + - 7 files changed, 718 insertions(+) - create mode 100644 drivers/mtd/ubi/block.c - ---- a/drivers/mtd/ubi/Kconfig -+++ b/drivers/mtd/ubi/Kconfig -@@ -87,4 +87,19 @@ config MTD_UBI_GLUEBI - work on top of UBI. Do not enable this unless you use legacy - software. - -+config MTD_UBI_BLOCK -+ bool "Read-only block devices on top of UBI volumes" -+ default n -+ help -+ This option enables read-only UBI block devices support. UBI block -+ devices will be layered on top of UBI volumes, which means that the -+ UBI driver will transparently handle things like bad eraseblocks and -+ bit-flips. You can put any block-oriented file system on top of UBI -+ volumes in read-only mode (e.g., ext4), but it is probably most -+ practical for read-only file systems, like squashfs. -+ -+ When selected, this feature will be built in the UBI driver. -+ -+ If in doubt, say "N". -+ - endif # MTD_UBI ---- a/drivers/mtd/ubi/Makefile -+++ b/drivers/mtd/ubi/Makefile -@@ -3,5 +3,6 @@ obj-$(CONFIG_MTD_UBI) += ubi.o - ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o attach.o - ubi-y += misc.o debug.o - ubi-$(CONFIG_MTD_UBI_FASTMAP) += fastmap.o -+ubi-$(CONFIG_MTD_UBI_BLOCK) += block.o - - obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o ---- /dev/null -+++ b/drivers/mtd/ubi/block.c -@@ -0,0 +1,646 @@ -+/* -+ * Copyright (c) 2014 Ezequiel Garcia -+ * Copyright (c) 2011 Free Electrons -+ * -+ * Driver parameter handling strongly based on drivers/mtd/ubi/build.c -+ * Copyright (c) International Business Machines Corp., 2006 -+ * Copyright (c) Nokia Corporation, 2007 -+ * Authors: Artem Bityutskiy, Frank Haverkamp -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License as published by -+ * the Free Software Foundation, version 2. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See -+ * the GNU General Public License for more details. -+ */ -+ -+/* -+ * Read-only block devices on top of UBI volumes -+ * -+ * A simple implementation to allow a block device to be layered on top of a -+ * UBI volume. The implementation is provided by creating a static 1-to-1 -+ * mapping between the block device and the UBI volume. -+ * -+ * The addressed byte is obtained from the addressed block sector, which is -+ * mapped linearly into the corresponding LEB: -+ * -+ * LEB number = addressed byte / LEB size -+ * -+ * This feature is compiled in the UBI core, and adds a new 'block' parameter -+ * to allow early block device attaching. Runtime block attach/detach for UBI -+ * volumes is provided through two new UBI ioctls: UBI_IOCVOLATTBLK and -+ * UBI_IOCVOLDETBLK. -+ */ -+ -+#include <linux/module.h> -+#include <linux/init.h> -+#include <linux/err.h> -+#include <linux/kernel.h> -+#include <linux/list.h> -+#include <linux/mutex.h> -+#include <linux/slab.h> -+#include <linux/vmalloc.h> -+#include <linux/mtd/ubi.h> -+#include <linux/workqueue.h> -+#include <linux/blkdev.h> -+#include <linux/hdreg.h> -+#include <asm/div64.h> -+ -+#include "ubi-media.h" -+#include "ubi.h" -+ -+/* Maximum number of supported devices */ -+#define UBIBLOCK_MAX_DEVICES 32 -+ -+/* Maximum length of the 'block=' parameter */ -+#define UBIBLOCK_PARAM_LEN 63 -+ -+/* Maximum number of comma-separated items in the 'block=' parameter */ -+#define UBIBLOCK_PARAM_COUNT 2 -+ -+struct ubiblock_param { -+ int ubi_num; -+ int vol_id; -+ char name[UBIBLOCK_PARAM_LEN+1]; -+}; -+ -+/* Numbers of elements set in the @ubiblock_param array */ -+static int ubiblock_devs __initdata; -+ -+/* MTD devices specification parameters */ -+static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES] __initdata; -+ -+struct ubiblock { -+ struct ubi_volume_desc *desc; -+ int ubi_num; -+ int vol_id; -+ int refcnt; -+ int leb_size; -+ -+ struct gendisk *gd; -+ struct request_queue *rq; -+ -+ struct workqueue_struct *wq; -+ struct work_struct work; -+ -+ struct mutex dev_mutex; -+ spinlock_t queue_lock; -+ struct list_head list; -+}; -+ -+/* Linked list of all ubiblock instances */ -+static LIST_HEAD(ubiblock_devices); -+static DEFINE_MUTEX(devices_mutex); -+static int ubiblock_major; -+ -+static int __init ubiblock_set_param(const char *val, -+ const struct kernel_param *kp) -+{ -+ int i, ret; -+ size_t len; -+ struct ubiblock_param *param; -+ char buf[UBIBLOCK_PARAM_LEN]; -+ char *pbuf = &buf[0]; -+ char *tokens[UBIBLOCK_PARAM_COUNT]; -+ -+ if (!val) -+ return -EINVAL; -+ -+ len = strnlen(val, UBIBLOCK_PARAM_LEN); -+ if (len == 0) { -+ ubi_warn("block: empty 'block=' parameter - ignored\n"); -+ return 0; -+ } -+ -+ if (len == UBIBLOCK_PARAM_LEN) { -+ ubi_err("block: parameter \"%s\" is too long, max. is %d\n", -+ val, UBIBLOCK_PARAM_LEN); -+ return -EINVAL; -+ } -+ -+ strcpy(buf, val); -+ -+ /* Get rid of the final newline */ -+ if (buf[len - 1] == '\n') -+ buf[len - 1] = '\0'; -+ -+ for (i = 0; i < UBIBLOCK_PARAM_COUNT; i++) -+ tokens[i] = strsep(&pbuf, ","); -+ -+ param = &ubiblock_param[ubiblock_devs]; -+ if (tokens[1]) { -+ /* Two parameters: can be 'ubi, vol_id' or 'ubi, vol_name' */ -+ ret = kstrtoint(tokens[0], 10, ¶m->ubi_num); -+ if (ret < 0) -+ return -EINVAL; -+ -+ /* Second param can be a number or a name */ -+ ret = kstrtoint(tokens[1], 10, ¶m->vol_id); -+ if (ret < 0) { -+ param->vol_id = -1; -+ strcpy(param->name, tokens[1]); -+ } -+ -+ } else { -+ /* One parameter: must be device path */ -+ strcpy(param->name, tokens[0]); -+ param->ubi_num = -1; -+ param->vol_id = -1; -+ } -+ -+ ubiblock_devs++; -+ -+ return 0; -+} -+ -+static const struct kernel_param_ops ubiblock_param_ops = { -+ .set = ubiblock_set_param, -+}; -+module_param_cb(block, &ubiblock_param_ops, NULL, 0); -+MODULE_PARM_DESC(block, "Attach block devices to UBI volumes. Parameter format: block=<path|dev,num|dev,name>.\n" -+ "Multiple \"block\" parameters may be specified.\n" -+ "UBI volumes may be specified by their number, name, or path to the device node.\n" -+ "Examples\n" -+ "Using the UBI volume path:\n" -+ "ubi.block=/dev/ubi0_0\n" -+ "Using the UBI device, and the volume name:\n" -+ "ubi.block=0,rootfs\n" -+ "Using both UBI device number and UBI volume number:\n" -+ "ubi.block=0,0\n"); -+ -+static struct ubiblock *find_dev_nolock(int ubi_num, int vol_id) -+{ -+ struct ubiblock *dev; -+ -+ list_for_each_entry(dev, &ubiblock_devices, list) -+ if (dev->ubi_num == ubi_num && dev->vol_id == vol_id) -+ return dev; -+ return NULL; -+} -+ -+static int ubiblock_read_to_buf(struct ubiblock *dev, char *buffer, -+ int leb, int offset, int len) -+{ -+ int ret; -+ -+ ret = ubi_read(dev->desc, leb, buffer, offset, len); -+ if (ret) { -+ ubi_err("%s ubi_read error %d", -+ dev->gd->disk_name, ret); -+ return ret; -+ } -+ return 0; -+} -+ -+static int ubiblock_read(struct ubiblock *dev, char *buffer, -+ sector_t sec, int len) -+{ -+ int ret, leb, offset; -+ int bytes_left = len; -+ int to_read = len; -+ loff_t pos = sec << 9; -+ -+ /* Get LEB:offset address to read from */ -+ offset = do_div(pos, dev->leb_size); -+ leb = pos; -+ -+ while (bytes_left) { -+ /* -+ * We can only read one LEB at a time. Therefore if the read -+ * length is larger than one LEB size, we split the operation. -+ */ -+ if (offset + to_read > dev->leb_size) -+ to_read = dev->leb_size - offset; -+ -+ ret = ubiblock_read_to_buf(dev, buffer, leb, offset, to_read); -+ if (ret) -+ return ret; -+ -+ buffer += to_read; -+ bytes_left -= to_read; -+ to_read = bytes_left; -+ leb += 1; -+ offset = 0; -+ } -+ return 0; -+} -+ -+static int do_ubiblock_request(struct ubiblock *dev, struct request *req) -+{ -+ int len, ret; -+ sector_t sec; -+ -+ if (req->cmd_type != REQ_TYPE_FS) -+ return -EIO; -+ -+ if (blk_rq_pos(req) + blk_rq_cur_sectors(req) > -+ get_capacity(req->rq_disk)) -+ return -EIO; -+ -+ if (rq_data_dir(req) != READ) -+ return -ENOSYS; /* Write not implemented */ -+ -+ sec = blk_rq_pos(req); -+ len = blk_rq_cur_bytes(req); -+ -+ /* -+ * Let's prevent the device from being removed while we're doing I/O -+ * work. Notice that this means we serialize all the I/O operations, -+ * but it's probably of no impact given the NAND core serializes -+ * flash access anyway. -+ */ -+ mutex_lock(&dev->dev_mutex); -+ ret = ubiblock_read(dev, req->buffer, sec, len); -+ mutex_unlock(&dev->dev_mutex); -+ -+ return ret; -+} -+ -+static void ubiblock_do_work(struct work_struct *work) -+{ -+ struct ubiblock *dev = -+ container_of(work, struct ubiblock, work); -+ struct request_queue *rq = dev->rq; -+ struct request *req; -+ int res; -+ -+ spin_lock_irq(rq->queue_lock); -+ -+ req = blk_fetch_request(rq); -+ while (req) { -+ -+ spin_unlock_irq(rq->queue_lock); -+ res = do_ubiblock_request(dev, req); -+ spin_lock_irq(rq->queue_lock); -+ -+ /* -+ * If we're done with this request, -+ * we need to fetch a new one -+ */ -+ if (!__blk_end_request_cur(req, res)) -+ req = blk_fetch_request(rq); -+ } -+ -+ spin_unlock_irq(rq->queue_lock); -+} -+ -+static void ubiblock_request(struct request_queue *rq) -+{ -+ struct ubiblock *dev; -+ struct request *req; -+ -+ dev = rq->queuedata; -+ -+ if (!dev) -+ while ((req = blk_fetch_request(rq)) != NULL) -+ __blk_end_request_all(req, -ENODEV); -+ else -+ queue_work(dev->wq, &dev->work); -+} -+ -+static int ubiblock_open(struct block_device *bdev, fmode_t mode) -+{ -+ struct ubiblock *dev = bdev->bd_disk->private_data; -+ int ret; -+ -+ mutex_lock(&dev->dev_mutex); -+ if (dev->refcnt > 0) { -+ /* -+ * The volume is already open, just increase the reference -+ * counter. -+ */ -+ goto out_done; -+ } -+ -+ /* -+ * We want users to be aware they should only mount us as read-only. -+ * It's just a paranoid check, as write requests will get rejected -+ * in any case. -+ */ -+ if (mode & FMODE_WRITE) { -+ ret = -EPERM; -+ goto out_unlock; -+ } -+ -+ dev->desc = ubi_open_volume(dev->ubi_num, dev->vol_id, UBI_READONLY); -+ if (IS_ERR(dev->desc)) { -+ ubi_err("%s failed to open ubi volume %d_%d", -+ dev->gd->disk_name, dev->ubi_num, dev->vol_id); -+ ret = PTR_ERR(dev->desc); -+ dev->desc = NULL; -+ goto out_unlock; -+ } -+ -+out_done: -+ dev->refcnt++; -+ mutex_unlock(&dev->dev_mutex); -+ return 0; -+ -+out_unlock: -+ mutex_unlock(&dev->dev_mutex); -+ return ret; -+} -+ -+static void ubiblock_release(struct gendisk *gd, fmode_t mode) -+{ -+ struct ubiblock *dev = gd->private_data; -+ -+ mutex_lock(&dev->dev_mutex); -+ dev->refcnt--; -+ if (dev->refcnt == 0) { -+ ubi_close_volume(dev->desc); -+ dev->desc = NULL; -+ } -+ mutex_unlock(&dev->dev_mutex); -+} -+ -+static int ubiblock_getgeo(struct block_device *bdev, struct hd_geometry *geo) -+{ -+ /* Some tools might require this information */ -+ geo->heads = 1; -+ geo->cylinders = 1; -+ geo->sectors = get_capacity(bdev->bd_disk); -+ geo->start = 0; -+ return 0; -+} -+ -+static const struct block_device_operations ubiblock_ops = { -+ .owner = THIS_MODULE, -+ .open = ubiblock_open, -+ .release = ubiblock_release, -+ .getgeo = ubiblock_getgeo, -+}; -+ -+int ubiblock_add(struct ubi_volume_info *vi) -+{ -+ struct ubiblock *dev; -+ struct gendisk *gd; -+ int disk_capacity; -+ int ret; -+ -+ /* Check that the volume isn't already handled */ -+ mutex_lock(&devices_mutex); -+ if (find_dev_nolock(vi->ubi_num, vi->vol_id)) { -+ mutex_unlock(&devices_mutex); -+ return -EEXIST; -+ } -+ mutex_unlock(&devices_mutex); -+ -+ dev = kzalloc(sizeof(struct ubiblock), GFP_KERNEL); -+ if (!dev) -+ return -ENOMEM; -+ -+ mutex_init(&dev->dev_mutex); -+ -+ dev->ubi_num = vi->ubi_num; -+ dev->vol_id = vi->vol_id; -+ dev->leb_size = vi->usable_leb_size; -+ -+ /* Initialize the gendisk of this ubiblock device */ -+ gd = alloc_disk(1); -+ if (!gd) { -+ ubi_err("block: alloc_disk failed"); -+ ret = -ENODEV; -+ goto out_free_dev; -+ } -+ -+ gd->fops = &ubiblock_ops; -+ gd->major = ubiblock_major; -+ gd->first_minor = dev->ubi_num * UBI_MAX_VOLUMES + dev->vol_id; -+ gd->private_data = dev; -+ sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id); -+ disk_capacity = (vi->size * vi->usable_leb_size) >> 9; -+ set_capacity(gd, disk_capacity); -+ dev->gd = gd; -+ -+ spin_lock_init(&dev->queue_lock); -+ dev->rq = blk_init_queue(ubiblock_request, &dev->queue_lock); -+ if (!dev->rq) { -+ ubi_err("block: blk_init_queue failed"); -+ ret = -ENODEV; -+ goto out_put_disk; -+ } -+ -+ dev->rq->queuedata = dev; -+ dev->gd->queue = dev->rq; -+ -+ /* -+ * Create one workqueue per volume (per registered block device). -+ * Rembember workqueues are cheap, they're not threads. -+ */ -+ dev->wq = alloc_workqueue(gd->disk_name, 0, 0); -+ if (!dev->wq) -+ goto out_free_queue; -+ INIT_WORK(&dev->work, ubiblock_do_work); -+ -+ mutex_lock(&devices_mutex); -+ list_add_tail(&dev->list, &ubiblock_devices); -+ mutex_unlock(&devices_mutex); -+ -+ /* Must be the last step: anyone can call file ops from now on */ -+ add_disk(dev->gd); -+ ubi_msg("%s created from ubi%d:%d(%s)", -+ dev->gd->disk_name, dev->ubi_num, dev->vol_id, vi->name); -+ return 0; -+ -+out_free_queue: -+ blk_cleanup_queue(dev->rq); -+out_put_disk: -+ put_disk(dev->gd); -+out_free_dev: -+ kfree(dev); -+ -+ return ret; -+} -+ -+static void ubiblock_cleanup(struct ubiblock *dev) -+{ -+ del_gendisk(dev->gd); -+ blk_cleanup_queue(dev->rq); -+ ubi_msg("%s released", dev->gd->disk_name); -+ put_disk(dev->gd); -+} -+ -+int ubiblock_del(struct ubi_volume_info *vi) -+{ -+ struct ubiblock *dev; -+ -+ mutex_lock(&devices_mutex); -+ dev = find_dev_nolock(vi->ubi_num, vi->vol_id); -+ if (!dev) { -+ mutex_unlock(&devices_mutex); -+ return -ENODEV; -+ } -+ -+ /* Found a device, let's lock it so we can check if it's busy */ -+ mutex_lock(&dev->dev_mutex); -+ if (dev->refcnt > 0) { -+ mutex_unlock(&dev->dev_mutex); -+ mutex_unlock(&devices_mutex); -+ return -EBUSY; -+ } -+ -+ /* Remove from device list */ -+ list_del(&dev->list); -+ mutex_unlock(&devices_mutex); -+ -+ /* Flush pending work and stop this workqueue */ -+ destroy_workqueue(dev->wq); -+ -+ ubiblock_cleanup(dev); -+ mutex_unlock(&dev->dev_mutex); -+ kfree(dev); -+ return 0; -+} -+ -+static void ubiblock_resize(struct ubi_volume_info *vi) -+{ -+ struct ubiblock *dev; -+ int disk_capacity; -+ -+ /* -+ * Need to lock the device list until we stop using the device, -+ * otherwise the device struct might get released in 'ubiblock_del()'. -+ */ -+ mutex_lock(&devices_mutex); -+ dev = find_dev_nolock(vi->ubi_num, vi->vol_id); -+ if (!dev) { -+ mutex_unlock(&devices_mutex); -+ return; -+ } -+ -+ mutex_lock(&dev->dev_mutex); -+ disk_capacity = (vi->size * vi->usable_leb_size) >> 9; -+ set_capacity(dev->gd, disk_capacity); -+ ubi_msg("%s resized to %d LEBs", dev->gd->disk_name, vi->size); -+ mutex_unlock(&dev->dev_mutex); -+ mutex_unlock(&devices_mutex); -+} -+ -+static int ubiblock_notify(struct notifier_block *nb, -+ unsigned long notification_type, void *ns_ptr) -+{ -+ struct ubi_notification *nt = ns_ptr; -+ -+ switch (notification_type) { -+ case UBI_VOLUME_ADDED: -+ /* -+ * We want to enforce explicit block device attaching for -+ * volumes, so when a volume is added we do nothing. -+ */ -+ break; -+ case UBI_VOLUME_REMOVED: -+ ubiblock_del(&nt->vi); -+ break; -+ case UBI_VOLUME_RESIZED: -+ ubiblock_resize(&nt->vi); -+ break; -+ default: -+ break; -+ } -+ return NOTIFY_OK; -+} -+ -+static struct notifier_block ubiblock_notifier = { -+ .notifier_call = ubiblock_notify, -+}; -+ -+static struct ubi_volume_desc * __init -+open_volume_desc(const char *name, int ubi_num, int vol_id) -+{ -+ if (ubi_num == -1) -+ /* No ubi num, name must be a vol device path */ -+ return ubi_open_volume_path(name, UBI_READONLY); -+ else if (vol_id == -1) -+ /* No vol_id, must be vol_name */ -+ return ubi_open_volume_nm(ubi_num, name, UBI_READONLY); -+ else -+ return ubi_open_volume(ubi_num, vol_id, UBI_READONLY); -+} -+ -+static int __init ubiblock_attach_from_param(void) -+{ -+ int i, ret; -+ struct ubiblock_param *p; -+ struct ubi_volume_desc *desc; -+ struct ubi_volume_info vi; -+ -+ for (i = 0; i < ubiblock_devs; i++) { -+ p = &ubiblock_param[i]; -+ -+ desc = open_volume_desc(p->name, p->ubi_num, p->vol_id); -+ if (IS_ERR(desc)) { -+ ubi_err("block: can't open volume, err=%ld\n", -+ PTR_ERR(desc)); -+ ret = PTR_ERR(desc); -+ break; -+ } -+ -+ ubi_get_volume_info(desc, &vi); -+ ubi_close_volume(desc); -+ -+ ret = ubiblock_add(&vi); -+ if (ret) { -+ ubi_err("block: can't add '%s' volume, err=%d\n", -+ vi.name, ret); -+ break; -+ } -+ } -+ return ret; -+} -+ -+static void ubiblock_detach_all(void) -+{ -+ struct ubiblock *next; -+ struct ubiblock *dev; -+ -+ list_for_each_entry_safe(dev, next, &ubiblock_devices, list) { -+ /* Flush pending work and stop workqueue */ -+ destroy_workqueue(dev->wq); -+ /* The module is being forcefully removed */ -+ WARN_ON(dev->desc); -+ /* Remove from device list */ -+ list_del(&dev->list); -+ ubiblock_cleanup(dev); -+ kfree(dev); -+ } -+} -+ -+int __init ubiblock_init(void) -+{ -+ int ret; -+ -+ ubiblock_major = register_blkdev(0, "ubiblock"); -+ if (ubiblock_major < 0) -+ return ubiblock_major; -+ -+ /* Attach block devices from 'block=' module param */ -+ ret = ubiblock_attach_from_param(); -+ if (ret) -+ goto err_detach; -+ -+ /* -+ * Block devices needs to be attached to volumes explicitly -+ * upon user request. So we ignore existing volumes. -+ */ -+ ret = ubi_register_volume_notifier(&ubiblock_notifier, 1); -+ if (ret) -+ goto err_unreg; -+ return 0; -+ -+err_unreg: -+ unregister_blkdev(ubiblock_major, "ubiblock"); -+err_detach: -+ ubiblock_detach_all(); -+ return ret; -+} -+ -+void __exit ubiblock_exit(void) -+{ -+ ubi_unregister_volume_notifier(&ubiblock_notifier); -+ ubiblock_detach_all(); -+ unregister_blkdev(ubiblock_major, "ubiblock"); -+} ---- a/drivers/mtd/ubi/build.c -+++ b/drivers/mtd/ubi/build.c -@@ -1290,6 +1290,15 @@ static int __init ubi_init(void) - } - } - -+ err = ubiblock_init(); -+ if (err) { -+ ubi_err("block: cannot initialize, error %d", err); -+ -+ /* See comment above re-ubi_is_module(). */ -+ if (ubi_is_module()) -+ goto out_detach; -+ } -+ - return 0; - - out_detach: -@@ -1318,6 +1327,8 @@ static void __exit ubi_exit(void) - { - int i; - -+ ubiblock_exit(); -+ - for (i = 0; i < UBI_MAX_DEVICES; i++) - if (ubi_devices[i]) { - mutex_lock(&ubi_devices_mutex); ---- a/drivers/mtd/ubi/cdev.c -+++ b/drivers/mtd/ubi/cdev.c -@@ -585,6 +585,26 @@ static long vol_cdev_ioctl(struct file * - break; - } - -+ /* Attach a block device to an UBI volume */ -+ case UBI_IOCVOLATTBLK: -+ { -+ struct ubi_volume_info vi; -+ -+ ubi_get_volume_info(desc, &vi); -+ err = ubiblock_add(&vi); -+ break; -+ } -+ -+ /* Dettach a block device from an UBI volume */ -+ case UBI_IOCVOLDETBLK: -+ { -+ struct ubi_volume_info vi; -+ -+ ubi_get_volume_info(desc, &vi); -+ err = ubiblock_del(&vi); -+ break; -+ } -+ - default: - err = -ENOTTY; - break; ---- a/drivers/mtd/ubi/ubi.h -+++ b/drivers/mtd/ubi/ubi.h -@@ -864,6 +864,20 @@ int ubi_update_fastmap(struct ubi_device - int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, - int fm_anchor); - -+/* block.c */ -+#ifdef CONFIG_MTD_UBI_BLOCK -+int ubiblock_init(void); -+void ubiblock_exit(void); -+int ubiblock_add(struct ubi_volume_info *vi); -+int ubiblock_del(struct ubi_volume_info *vi); -+#else -+static inline int ubiblock_init(void) { return 0; } -+static inline void ubiblock_exit(void) {} -+static inline int ubiblock_add(struct ubi_volume_info *vi) { return -ENOTTY; } -+static inline int ubiblock_del(struct ubi_volume_info *vi) { return -ENOTTY; } -+#endif -+ -+ - /* - * ubi_rb_for_each_entry - walk an RB-tree. - * @rb: a pointer to type 'struct rb_node' to use as a loop counter ---- a/include/uapi/mtd/ubi-user.h -+++ b/include/uapi/mtd/ubi-user.h -@@ -134,6 +134,13 @@ - * used. A pointer to a &struct ubi_set_vol_prop_req object is expected to be - * passed. The object describes which property should be set, and to which value - * it should be set. -+ * -+ * Block devices on UBI volumes -+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -+ * -+ * To attach or detach a block device from an UBI volume the %UBI_IOCVOLATTBLK -+ * and %UBI_IOCVOLDETBLK ioctl commands should be used, respectively. -+ * These commands take no arguments. - */ - - /* -@@ -188,6 +195,10 @@ - /* Set an UBI volume property */ - #define UBI_IOCSETVOLPROP _IOW(UBI_VOL_IOC_MAGIC, 6, \ - struct ubi_set_vol_prop_req) -+/* Attach a block device to an UBI volume */ -+#define UBI_IOCVOLATTBLK _IO(UBI_VOL_IOC_MAGIC, 7) -+/* Detach a block device from an UBI volume */ -+#define UBI_IOCVOLDETBLK _IO(UBI_VOL_IOC_MAGIC, 8) - - /* Maximum MTD device name length supported by UBI */ - #define MAX_UBI_MTD_NAME_LEN 127 |