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kernel: backport the ubiblock patches from 3.14->3.10 

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41120 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
John Crispin 2014-06-11 12:59:15 +00:00
parent 41aefc9332
commit 2b08433100
13 changed files with 1754 additions and 0 deletions
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847
target/linux/generic/patches-3.10/040-UBI-R-O-block-driver-on-top-of-UBI-volumes.patch Normal file
View File

@ -0,0 +1,847 @@
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
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index 36663af..783fb18 100644
--- 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
diff --git a/drivers/mtd/ubi/Makefile b/drivers/mtd/ubi/Makefile
index b46b0c97..4e3c3d7 100644
--- 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
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
new file mode 100644
index 0000000..cea7d1c
--- /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, &param->ubi_num);
+ if (ret < 0)
+ return -EINVAL;
+
+ /* Second param can be a number or a name */
+ ret = kstrtoint(tokens[1], 10, &param->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");
+}
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 57deae9..6e30a3c 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1298,6 +1298,15 @@ 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:
@@ -1326,6 +1335,8 @@ 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);
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 8ca49f2..39d3774 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -561,6 +561,26 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
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;
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 8ea6297..e76ff98 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -864,6 +864,20 @@ int ubi_update_fastmap(struct ubi_device *ubi);
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
diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h
index 723c324..b98585a 100644
--- 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.
*/
/*
@@ -191,6 +198,10 @@
/* 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
--
1.9.2

194
target/linux/generic/patches-3.10/041-UBI-block-do-not-use-term-attach.patch Normal file
View File

@ -0,0 +1,194 @@
From 4d283ee2517303afa54ad6cbd9342a2f748cf509 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Date: Tue, 4 Mar 2014 12:00:26 +0200
Subject: [PATCH] UBI: block: do not use term "attach"
We already use term attach/detach for UBI->MTD relations, let's not use this
for UBI->ubiblock relations to avoid confusion. Just use 'create' and 'remove'
instead. E.g., "create a R/O block device on top of a UBI volume".
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
drivers/mtd/ubi/block.c | 39 ++++++++++++++++++++-------------------
drivers/mtd/ubi/cdev.c | 4 ++--
drivers/mtd/ubi/ubi.h | 14 ++++++++++----
3 files changed, 32 insertions(+), 25 deletions(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index cea7d1c..6402e41 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -29,10 +29,10 @@
*
* 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.
+ * This feature is compiled in the UBI core, and adds a 'block' parameter
+ * to allow early creation of block devices on top of UBI volumes. Runtime
+ * block creation/removal for UBI volumes is provided through two UBI ioctls:
+ * UBI_IOCVOLATTBLK and UBI_IOCVOLDETBLK.
*/
#include <linux/module.h>
@@ -374,7 +374,7 @@ static const struct block_device_operations ubiblock_ops = {
.getgeo = ubiblock_getgeo,
};
-int ubiblock_add(struct ubi_volume_info *vi)
+int ubiblock_create(struct ubi_volume_info *vi)
{
struct ubiblock *dev;
struct gendisk *gd;
@@ -464,7 +464,7 @@ static void ubiblock_cleanup(struct ubiblock *dev)
put_disk(dev->gd);
}
-int ubiblock_del(struct ubi_volume_info *vi)
+int ubiblock_remove(struct ubi_volume_info *vi)
{
struct ubiblock *dev;
@@ -503,7 +503,8 @@ static void ubiblock_resize(struct ubi_volume_info *vi)
/*
* Need to lock the device list until we stop using the device,
- * otherwise the device struct might get released in 'ubiblock_del()'.
+ * otherwise the device struct might get released in
+ * 'ubiblock_remove()'.
*/
mutex_lock(&devices_mutex);
dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
@@ -528,12 +529,12 @@ static int ubiblock_notify(struct notifier_block *nb,
switch (notification_type) {
case UBI_VOLUME_ADDED:
/*
- * We want to enforce explicit block device attaching for
+ * We want to enforce explicit block device creation for
* volumes, so when a volume is added we do nothing.
*/
break;
case UBI_VOLUME_REMOVED:
- ubiblock_del(&nt->vi);
+ ubiblock_remove(&nt->vi);
break;
case UBI_VOLUME_RESIZED:
ubiblock_resize(&nt->vi);
@@ -561,7 +562,7 @@ open_volume_desc(const char *name, int ubi_num, int vol_id)
return ubi_open_volume(ubi_num, vol_id, UBI_READONLY);
}
-static int __init ubiblock_attach_from_param(void)
+static int __init ubiblock_create_from_param(void)
{
int i, ret;
struct ubiblock_param *p;
@@ -582,7 +583,7 @@ static int __init ubiblock_attach_from_param(void)
ubi_get_volume_info(desc, &vi);
ubi_close_volume(desc);
- ret = ubiblock_add(&vi);
+ ret = ubiblock_create(&vi);
if (ret) {
ubi_err("block: can't add '%s' volume, err=%d\n",
vi.name, ret);
@@ -592,7 +593,7 @@ static int __init ubiblock_attach_from_param(void)
return ret;
}
-static void ubiblock_detach_all(void)
+static void ubiblock_remove_all(void)
{
struct ubiblock *next;
struct ubiblock *dev;
@@ -618,13 +619,13 @@ int __init ubiblock_init(void)
return ubiblock_major;
/* Attach block devices from 'block=' module param */
- ret = ubiblock_attach_from_param();
+ ret = ubiblock_create_from_param();
if (ret)
- goto err_detach;
+ goto err_remove;
/*
- * Block devices needs to be attached to volumes explicitly
- * upon user request. So we ignore existing volumes.
+ * Block devices are only created upon user requests, so we ignore
+ * existing volumes.
*/
ret = ubi_register_volume_notifier(&ubiblock_notifier, 1);
if (ret)
@@ -633,14 +634,14 @@ int __init ubiblock_init(void)
err_unreg:
unregister_blkdev(ubiblock_major, "ubiblock");
-err_detach:
- ubiblock_detach_all();
+err_remove:
+ ubiblock_remove_all();
return ret;
}
void __exit ubiblock_exit(void)
{
ubi_unregister_volume_notifier(&ubiblock_notifier);
- ubiblock_detach_all();
+ ubiblock_remove_all();
unregister_blkdev(ubiblock_major, "ubiblock");
}
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 39d3774..11c8473 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -567,7 +567,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
struct ubi_volume_info vi;
ubi_get_volume_info(desc, &vi);
- err = ubiblock_add(&vi);
+ err = ubiblock_create(&vi);
break;
}
@@ -577,7 +577,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
struct ubi_volume_info vi;
ubi_get_volume_info(desc, &vi);
- err = ubiblock_del(&vi);
+ err = ubiblock_remove(&vi);
break;
}
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index e76ff98..2e588a9 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -868,13 +868,19 @@ int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
#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);
+int ubiblock_create(struct ubi_volume_info *vi);
+int ubiblock_remove(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; }
+static inline int ubiblock_create(struct ubi_volume_info *vi)
+{
+ return -ENOTTY;
+}
+static inline int ubiblock_remove(struct ubi_volume_info *vi)
+{
+ return -ENOTTY;
+}
#endif
--
1.9.2

42
target/linux/generic/patches-3.10/042-UBI-block-Mark-init-only-symbol-as-__initdata.patch Normal file
View File

@ -0,0 +1,42 @@
From ca2b722d1ab5bc3ffc34b5995248968cd8a7cb6f Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Mon, 3 Mar 2014 13:42:38 -0300
Subject: [PATCH] UBI: block: Mark init-only symbol as __initdata
ubiblock_param_ops should be marked as __init as it's only used to set
a driver parameter on insertion time. This commit fixes the following:
WARNING: drivers/mtd/built-in.o(.text+0x653ac): Section mismatch in
reference from the variable ubiblock_param_ops to the function
.init.text:ubiblock_set_param()
The function ubiblock_param_ops() references the function __init
ubiblock_set_param(). This is often because ubiblock_param_ops lacks a
__init annotation or the annotation of ubiblock_set_param is wrong.
Given gcc errors if the struct is marked const __initdata, this commit
drops the const mark from it.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
drivers/mtd/ubi/block.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 6402e41..cd6be98 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -156,7 +156,7 @@ static int __init ubiblock_set_param(const char *val,
return 0;
}
-static const struct kernel_param_ops ubiblock_param_ops = {
+static struct kernel_param_ops ubiblock_param_ops __initdata = {
.set = ubiblock_set_param,
};
module_param_cb(block, &ubiblock_param_ops, NULL, 0);
--
1.9.2

33
target/linux/generic/patches-3.10/043-UBI-block-Use-u64-for-the-64-bit-dividend.patch Normal file
View File

@ -0,0 +1,33 @@
From 9981e14ab2f7c6a4d2bb45e51a6371964919837d Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Mon, 3 Mar 2014 13:42:39 -0300
Subject: [PATCH] UBI: block: Use 'u64' for the 64-bit dividend
Fixes the following warning on ARCH=avr32:
drivers/mtd/ubi/block.c: In function 'ubiblock_read':
drivers/mtd/ubi/block.c:207: warning: comparison of distinct pointer types lacks a cast
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
drivers/mtd/ubi/block.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index cd6be98..16e6731 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -201,7 +201,7 @@ static int ubiblock_read(struct ubiblock *dev, char *buffer,
int ret, leb, offset;
int bytes_left = len;
int to_read = len;
- loff_t pos = sec << 9;
+ u64 pos = sec << 9;
/* Get LEB:offset address to read from */
offset = do_div(pos, dev->leb_size);
--
1.9.2

92
target/linux/generic/patches-3.10/044-UBI-rename-block-device-ioctls.patch Normal file
View File

@ -0,0 +1,92 @@
From 8af871887fcba470ff9265c65cff7d14d9e0e3f9 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Date: Wed, 5 Mar 2014 13:01:56 +0200
Subject: [PATCH] UBI: rename block device ioctls
Rename the UBI_IOCVOLATTBLK and UBI_IOCVOLDETBLK to UBI_IOCVOLCRBLK and
UBI_IOCVOLRMBLK, because we do not use terms "attach" and "detach" for the R/O
block devices on top of UBI volumes. Instead, we use terms "create" and
"remove". This patch also amends the related commentaries.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Acked-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
drivers/mtd/ubi/block.c | 2 +-
drivers/mtd/ubi/cdev.c | 8 ++++----
include/uapi/mtd/ubi-user.h | 14 +++++++-------
3 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 16e6731..69a74fd 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -32,7 +32,7 @@
* This feature is compiled in the UBI core, and adds a 'block' parameter
* to allow early creation of block devices on top of UBI volumes. Runtime
* block creation/removal for UBI volumes is provided through two UBI ioctls:
- * UBI_IOCVOLATTBLK and UBI_IOCVOLDETBLK.
+ * UBI_IOCVOLCRBLK and UBI_IOCVOLRMBLK.
*/
#include <linux/module.h>
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 11c8473..f54562a 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -561,8 +561,8 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
break;
}
- /* Attach a block device to an UBI volume */
- case UBI_IOCVOLATTBLK:
+ /* Create a R/O block device on top of the UBI volume */
+ case UBI_IOCVOLCRBLK:
{
struct ubi_volume_info vi;
@@ -571,8 +571,8 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
break;
}
- /* Dettach a block device from an UBI volume */
- case UBI_IOCVOLDETBLK:
+ /* Remove the R/O block device */
+ case UBI_IOCVOLRMBLK:
{
struct ubi_volume_info vi;
diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h
index b98585a..9c885e2 100644
--- a/include/uapi/mtd/ubi-user.h
+++ b/include/uapi/mtd/ubi-user.h
@@ -138,9 +138,9 @@
* 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.
+ * To create or remove a R/O block device on top of an UBI volume the
+ * %UBI_IOCVOLCRBLK and %UBI_IOCVOLRMBLK ioctl commands should be used,
+ * respectively. These commands take no arguments.
*/
/*
@@ -198,10 +198,10 @@
/* 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)
+/* Create a R/O block device on top of an UBI volume */
+#define UBI_IOCVOLCRBLK _IO(UBI_VOL_IOC_MAGIC, 7)
+/* Remove the R/O block device */
+#define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8)
/* Maximum MTD device name length supported by UBI */
#define MAX_UBI_MTD_NAME_LEN 127
--
1.9.2

35
target/linux/generic/patches-3.10/045-UBI-block-Remove-__initdata-from-ubiblock_param_ops.patch Normal file
View File

@ -0,0 +1,35 @@
From d56030ac25d383218045c5d87e98e0494d6af3ad Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Wed, 19 Mar 2014 11:43:22 +0100
Subject: [PATCH] UBI: block: Remove __initdata from ubiblock_param_ops
You cannot mark these parameters as __initdata.
Otherwise the data is gone upon module exit.
Fixes:
[ 172.045465] BUG: unable to handle kernel paging request at ffffffffa001db38
[ 172.046020] IP: [<ffffffff81067aa4>] destroy_params+0x24/0x50
Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
drivers/mtd/ubi/block.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 69a74fd..7ff473c 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -156,7 +156,7 @@ static int __init ubiblock_set_param(const char *val,
return 0;
}
-static struct kernel_param_ops ubiblock_param_ops __initdata = {
+static struct kernel_param_ops ubiblock_param_ops = {
.set = ubiblock_set_param,
};
module_param_cb(block, &ubiblock_param_ops, NULL, 0);
--
1.9.2

30
target/linux/generic/patches-3.10/046-UBI-avoid-workqueue-format-string-leak.patch Normal file
View File

@ -0,0 +1,30 @@
From bebfef150e0b8fa68704cddacf05b8c26462d565 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Mon, 7 Apr 2014 21:44:07 -0700
Subject: [PATCH] UBI: avoid workqueue format string leak
When building the name for the workqueue thread, make sure a format
string cannot leak in from the disk name.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
drivers/mtd/ubi/block.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 7ff473c..8d659e6 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -431,7 +431,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
* 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);
+ dev->wq = alloc_workqueue("%s", 0, 0, gd->disk_name);
if (!dev->wq)
goto out_free_queue;
INIT_WORK(&dev->work, ubiblock_do_work);
--
1.9.2

63
target/linux/generic/patches-3.10/047-UBI-make-UBI_IOCVOLCRBLK-take-a-parameter-for-future.patch Normal file
View File

@ -0,0 +1,63 @@
From 463c5eedb4a13b9aa91f05498a0f2c20bd03f8c4 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Wed, 5 Mar 2014 11:16:14 -0300
Subject: [PATCH] UBI: make UBI_IOCVOLCRBLK take a parameter for future usage
In order to allow a future ioctl parameter, such as a creation flag,
we change the UBI_IOCVOLCRBLK so it accepts a struct ubi_blkcreate_req.
For the time being the structure is not in use, but fully reserved.
This ABI change is still possible and harmless, because the ioctl has just
been introduced and there's no userspace program which uses it.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
include/uapi/mtd/ubi-user.h | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h
index 9c885e2..1927b0d 100644
--- a/include/uapi/mtd/ubi-user.h
+++ b/include/uapi/mtd/ubi-user.h
@@ -138,9 +138,12 @@
* Block devices on UBI volumes
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
- * To create or remove a R/O block device on top of an UBI volume the
- * %UBI_IOCVOLCRBLK and %UBI_IOCVOLRMBLK ioctl commands should be used,
- * respectively. These commands take no arguments.
+ * To create a R/O block device on top of an UBI volume the %UBI_IOCVOLCRBLK
+ * should be used. A pointer to a &struct ubi_blkcreate_req object is expected
+ * to be passed, which is not used and reserved for future usage.
+ *
+ * Conversely, to remove a block device the %UBI_IOCVOLRMBLK should be used,
+ * which takes no arguments.
*/
/*
@@ -199,7 +202,7 @@
#define UBI_IOCSETVOLPROP _IOW(UBI_VOL_IOC_MAGIC, 6, \
struct ubi_set_vol_prop_req)
/* Create a R/O block device on top of an UBI volume */
-#define UBI_IOCVOLCRBLK _IO(UBI_VOL_IOC_MAGIC, 7)
+#define UBI_IOCVOLCRBLK _IOW(UBI_VOL_IOC_MAGIC, 7, struct ubi_blkcreate_req)
/* Remove the R/O block device */
#define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8)
@@ -431,4 +434,12 @@ struct ubi_set_vol_prop_req {
__u64 value;
} __packed;
+/**
+ * struct ubi_blkcreate_req - a data structure used in block creation requests.
+ * @padding: reserved for future, not used, has to be zeroed
+ */
+struct ubi_blkcreate_req {
+ __s8 padding[128];
+} __packed;
+
#endif /* __UBI_USER_H__ */
--
1.9.2

68
target/linux/generic/patches-3.10/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch Normal file
View File

@ -0,0 +1,68 @@
From 8a52e4100d7c3a4a1dfddfa02b8864a9b0068c13 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Sat, 17 May 2014 03:36:18 +0200
Subject: [PATCH 1/5] ubi: auto-attach mtd device named "ubi" or "data" on boot
To: openwrt-devel@lists.openwrt.org
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 6e30a3c..999a36b 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1209,6 +1209,36 @@ static struct mtd_info * __init open_mtd_device(const char *mtd_dev)
return mtd;
}
+/*
+ * This function tries attaching mtd partitions named either "ubi" or "data"
+ * during boot.
+ */
+static void __init ubi_auto_attach(void)
+{
+ int err;
+ struct mtd_info *mtd;
+ /* try attaching mtd device named "ubi" or "data" */
+ mtd = open_mtd_device("ubi");
+ if (IS_ERR(mtd))
+ mtd = open_mtd_device("data");
+
+ if (!IS_ERR(mtd)) {
+ /* auto-add only media types where UBI makes sense */
+ if (mtd->type == MTD_NANDFLASH ||
+ mtd->type == MTD_DATAFLASH ||
+ mtd->type == MTD_MLCNANDFLASH) {
+ mutex_lock(&ubi_devices_mutex);
+ ubi_msg("auto-attach mtd%d", mtd->index);
+ err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0);
+ mutex_unlock(&ubi_devices_mutex);
+ if (err < 0) {
+ ubi_err("cannot attach mtd%d", mtd->index);
+ put_mtd_device(mtd);
+ }
+ }
+ }
+}
+
static int __init ubi_init(void)
{
int err, i, k;
@@ -1298,6 +1328,12 @@ static int __init ubi_init(void)
}
}
+ /* auto-attach mtd devices only if built-in to the kernel and no ubi.mtd
+ * parameter was given */
+ if (config_enabled(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
+ !ubi_is_module() && !mtd_devs)
+ ubi_auto_attach();
+
err = ubiblock_init();
if (err) {
ubi_err("block: cannot initialize, error %d", err);
--
1.9.2

74
target/linux/generic/patches-3.10/491-ubi-auto-create-ubiblock-device-for-rootfs.patch Normal file
View File

@ -0,0 +1,74 @@
From 0f3966579815f889bb2fcb4846152c35f65e79c4 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Thu, 15 May 2014 21:06:33 +0200
Subject: [PATCH 2/5] ubi: auto-create ubiblock device for rootfs
To: openwrt-devel@lists.openwrt.org
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/mtd/ubi/block.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 8d659e6..2dbe2f4 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -593,6 +593,44 @@ static int __init ubiblock_create_from_param(void)
return ret;
}
+#define UBIFS_NODE_MAGIC 0x06101831
+static inline int ubi_vol_is_ubifs(struct ubi_volume_desc *desc)
+{
+ int ret;
+ uint32_t magic_of, magic;
+ ret = ubi_read(desc, 0, (char *)&magic_of, 0, 4);
+ if (ret)
+ return 0;
+ magic = le32_to_cpu(magic_of);
+ return magic == UBIFS_NODE_MAGIC;
+}
+
+static void __init ubiblock_create_auto_rootfs(void)
+{
+ int ubi_num, ret, is_ubifs;
+ struct ubi_volume_desc *desc;
+ struct ubi_volume_info vi;
+
+ for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) {
+ desc = ubi_open_volume_nm(ubi_num, "rootfs", UBI_READONLY);
+ if (IS_ERR(desc))
+ continue;
+
+ ubi_get_volume_info(desc, &vi);
+ is_ubifs = ubi_vol_is_ubifs(desc);
+ ubi_close_volume(desc);
+ if (is_ubifs)
+ break;
+
+ ret = ubiblock_create(&vi);
+ if (ret)
+ ubi_err("block: can't add '%s' volume, err=%d\n",
+ vi.name, ret);
+ /* always break if we get here */
+ break;
+ }
+}
+
static void ubiblock_remove_all(void)
{
struct ubiblock *next;
@@ -623,6 +661,10 @@ int __init ubiblock_init(void)
if (ret)
goto err_remove;
+ /* auto-attach "rootfs" volume if existing and non-ubifs */
+ if (config_enabled(CONFIG_MTD_ROOTFS_ROOT_DEV))
+ ubiblock_create_auto_rootfs();
+
/*
* Block devices are only created upon user requests, so we ignore
* existing volumes.
--
1.9.2

58
target/linux/generic/patches-3.10/492-try-auto-mounting-ubi0-rootfs-in-init-do_mounts.c.patch Normal file
View File

@ -0,0 +1,58 @@
From eea9e1785e4c05c2a3444506aabafa0ae958538f Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Sat, 17 May 2014 03:35:02 +0200
Subject: [PATCH 4/5] try auto-mounting ubi0:rootfs in init/do_mounts.c
To: openwrt-devel@lists.openwrt.org
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
init/do_mounts.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 82f2288..faba9c6 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -432,7 +432,27 @@ retry:
out:
put_page(page);
}
-
+
+static int __init mount_ubi_rootfs(void)
+{
+ int flags = MS_SILENT;
+ int err, tried = 0;
+
+ while (tried < 2) {
+ err = do_mount_root("ubi0:rootfs", "ubifs", flags, \
+ root_mount_data);
+ switch (err) {
+ case -EACCES:
+ flags |= MS_RDONLY;
+ tried++;
+ default:
+ return err;
+ }
+ }
+
+ return -EINVAL;
+}
+
#ifdef CONFIG_ROOT_NFS
#define NFSROOT_TIMEOUT_MIN 5
@@ -526,6 +546,10 @@ void __init mount_root(void)
change_floppy("root floppy");
}
#endif
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+ if (!mount_ubi_rootfs())
+ return;
+#endif
#ifdef CONFIG_BLOCK
create_dev("/dev/root", ROOT_DEV);
mount_block_root("/dev/root", root_mountflags);
--
1.9.2

42
target/linux/generic/patches-3.10/493-ubi-set-ROOT_DEV-to-ubiblock-rootfs-if-unset.patch Normal file
View File

@ -0,0 +1,42 @@
From cd68d1b12b5ea4c01a664c064179ada42bf55d3d Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Thu, 15 May 2014 20:55:42 +0200
Subject: [PATCH 5/5] ubi: set ROOT_DEV to ubiblock "rootfs" if unset
To: openwrt-devel@lists.openwrt.org
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/mtd/ubi/block.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 2dbe2f4..eaa29f8 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -48,6 +48,7 @@
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <asm/div64.h>
+#include <linux/root_dev.h>
#include "ubi-media.h"
#include "ubi.h"
@@ -444,6 +445,15 @@ int ubiblock_create(struct ubi_volume_info *vi)
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);
+
+ if (!strcmp(vi->name, "rootfs") &&
+ config_enabled(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
+ ROOT_DEV == 0) {
+ pr_notice("ubiblock: device ubiblock%d_%d (%s) set to be root filesystem\n",
+ dev->ubi_num, dev->vol_id, vi->name);
+ ROOT_DEV = MKDEV(gd->major, gd->first_minor);
+ }
+
return 0;
out_free_queue:
--
1.9.2

176
target/linux/generic/patches-3.10/552-ubifs-respect-silent-mount-flag.patch Normal file
View File

@ -0,0 +1,176 @@
From 248b89b95d27659c5360ef5b68cca21d096ee909 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Sat, 17 May 2014 03:16:54 +0200
Subject: [PATCH 3/5] ubifs: respect MS_SILENT mount flag
To: dedekind1@gmail.com,
linux-mtd@lists.infradead.org
When attempting to mount a non-ubifs formatted volume, lots of error
messages (including a stack dump) are thrown to the kernel log even if
the MS_SILENT mount flag is set.
Fix this by checking the MS_SILENT flag in ubifs_read_sb_node and
passing it down to ubifs_read_node, which now got an additional
parameter for that purpose.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
fs/ubifs/commit.c | 4 ++--
fs/ubifs/io.c | 23 ++++++++++++++---------
fs/ubifs/sb.c | 5 +++--
fs/ubifs/tnc_misc.c | 4 ++--
fs/ubifs/ubifs.h | 2 +-
5 files changed, 22 insertions(+), 16 deletions(-)
diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c
index ff82293..865d13f 100644
--- a/fs/ubifs/commit.c
+++ b/fs/ubifs/commit.c
@@ -542,7 +542,7 @@ int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot)
if (!idx)
return -ENOMEM;
- err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
+ err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs, 0);
if (err)
goto out;
@@ -610,7 +610,7 @@ int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot)
list_add_tail(&i->list, &list);
/* Read the index node */
idx = &i->idx;
- err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
+ err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs, 0);
if (err)
goto out_free;
/* Validate index node */
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index e18b988..51c4072 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -912,7 +912,7 @@ int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
if (!overlap) {
/* We may safely unlock the write-buffer and read the data */
spin_unlock(&wbuf->lock);
- return ubifs_read_node(c, buf, type, len, lnum, offs);
+ return ubifs_read_node(c, buf, type, len, lnum, offs, 0);
}
/* Don't read under wbuf */
@@ -966,13 +966,14 @@ out:
* @len: node length (not aligned)
* @lnum: logical eraseblock number
* @offs: offset within the logical eraseblock
+ * @silent: suppress error messages
*
* This function reads a node of known type and and length, checks it and
* stores in @buf. Returns zero in case of success, %-EUCLEAN if CRC mismatched
* and a negative error code in case of failure.
*/
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
- int lnum, int offs)
+ int lnum, int offs, int silent)
{
int err, l;
struct ubifs_ch *ch = buf;
@@ -988,30 +989,34 @@ int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
return err;
if (type != ch->node_type) {
- ubifs_err("bad node type (%d but expected %d)",
+ if (!silent) ubifs_err("bad node type (%d but expected %d)",
ch->node_type, type);
goto out;
}
err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
if (err) {
- ubifs_err("expected node type %d", type);
+ if (!silent)
+ ubifs_err("expected node type %d", type);
return err;
}
l = le32_to_cpu(ch->len);
if (l != len) {
- ubifs_err("bad node length %d, expected %d", l, len);
+ if (!silent)
+ ubifs_err("bad node length %d, expected %d", l, len);
goto out;
}
return 0;
out:
- ubifs_err("bad node at LEB %d:%d, LEB mapping status %d", lnum, offs,
- ubi_is_mapped(c->ubi, lnum));
- ubifs_dump_node(c, buf);
- dump_stack();
+ if (!silent) {
+ ubifs_err("bad node at LEB %d:%d, LEB mapping status %d", lnum,
+ offs, ubi_is_mapped(c->ubi, lnum));
+ ubifs_dump_node(c, buf);
+ dump_stack();
+ }
return -EINVAL;
}
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 4c37607..b46847d 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -482,14 +482,15 @@ failed:
struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
{
struct ubifs_sb_node *sup;
- int err;
+ int silent, err;
sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS);
if (!sup)
return ERR_PTR(-ENOMEM);
+ silent = !!(c->vfs_sb->s_flags & MS_SILENT);
err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ,
- UBIFS_SB_LNUM, 0);
+ UBIFS_SB_LNUM, 0, silent);
if (err) {
kfree(sup);
return ERR_PTR(err);
diff --git a/fs/ubifs/tnc_misc.c b/fs/ubifs/tnc_misc.c
index f6bf899..e128689 100644
--- a/fs/ubifs/tnc_misc.c
+++ b/fs/ubifs/tnc_misc.c
@@ -280,7 +280,7 @@ static int read_znode(struct ubifs_info *c, int lnum, int offs, int len,
if (!idx)
return -ENOMEM;
- err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
+ err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs, 0);
if (err < 0) {
kfree(idx);
return err;
@@ -472,7 +472,7 @@ int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr,
zbr->lnum, zbr->offs);
else
err = ubifs_read_node(c, node, type, zbr->len, zbr->lnum,
- zbr->offs);
+ zbr->offs, 0);
if (err) {
dbg_tnck(key, "key ");
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index e8c8cfe..85fdd11 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1481,7 +1481,7 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len);
int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs);
int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf);
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
- int lnum, int offs);
+ int lnum, int offs, int silent);
int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
int lnum, int offs);
int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum,
--
1.9.2