![Ben Dooks](/assets/img/avatar_default.png)
In build.c, the following pr_err calls should be terminated with a new-line to avoid other messages being concatenated onto the end. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
679 lines
16 KiB
C
679 lines
16 KiB
C
/*
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* Copyright (c) 2014 Ezequiel Garcia
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* Copyright (c) 2011 Free Electrons
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*
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* Driver parameter handling strongly based on drivers/mtd/ubi/build.c
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* Copyright (c) International Business Machines Corp., 2006
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* Copyright (c) Nokia Corporation, 2007
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* Authors: Artem Bityutskiy, Frank Haverkamp
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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/*
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* Read-only block devices on top of UBI volumes
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*
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* A simple implementation to allow a block device to be layered on top of a
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* UBI volume. The implementation is provided by creating a static 1-to-1
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* mapping between the block device and the UBI volume.
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*
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* The addressed byte is obtained from the addressed block sector, which is
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* mapped linearly into the corresponding LEB:
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*
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* LEB number = addressed byte / LEB size
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*
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* This feature is compiled in the UBI core, and adds a 'block' parameter
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* to allow early creation of block devices on top of UBI volumes. Runtime
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* block creation/removal for UBI volumes is provided through two UBI ioctls:
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* UBI_IOCVOLCRBLK and UBI_IOCVOLRMBLK.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/mtd/ubi.h>
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#include <linux/workqueue.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/hdreg.h>
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#include <linux/scatterlist.h>
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#include <linux/idr.h>
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#include <asm/div64.h>
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#include "ubi-media.h"
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#include "ubi.h"
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/* Maximum number of supported devices */
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#define UBIBLOCK_MAX_DEVICES 32
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/* Maximum length of the 'block=' parameter */
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#define UBIBLOCK_PARAM_LEN 63
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/* Maximum number of comma-separated items in the 'block=' parameter */
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#define UBIBLOCK_PARAM_COUNT 2
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struct ubiblock_param {
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int ubi_num;
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int vol_id;
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char name[UBIBLOCK_PARAM_LEN+1];
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};
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struct ubiblock_pdu {
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struct work_struct work;
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struct ubi_sgl usgl;
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};
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/* Numbers of elements set in the @ubiblock_param array */
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static int ubiblock_devs __initdata;
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/* MTD devices specification parameters */
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static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES] __initdata;
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struct ubiblock {
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struct ubi_volume_desc *desc;
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int ubi_num;
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int vol_id;
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int refcnt;
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int leb_size;
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struct gendisk *gd;
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struct request_queue *rq;
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struct workqueue_struct *wq;
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struct mutex dev_mutex;
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struct list_head list;
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struct blk_mq_tag_set tag_set;
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};
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/* Linked list of all ubiblock instances */
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static LIST_HEAD(ubiblock_devices);
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static DEFINE_MUTEX(devices_mutex);
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static int ubiblock_major;
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static int __init ubiblock_set_param(const char *val,
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const struct kernel_param *kp)
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{
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int i, ret;
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size_t len;
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struct ubiblock_param *param;
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char buf[UBIBLOCK_PARAM_LEN];
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char *pbuf = &buf[0];
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char *tokens[UBIBLOCK_PARAM_COUNT];
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if (!val)
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return -EINVAL;
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len = strnlen(val, UBIBLOCK_PARAM_LEN);
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if (len == 0) {
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pr_warn("UBI: block: empty 'block=' parameter - ignored\n");
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return 0;
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}
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if (len == UBIBLOCK_PARAM_LEN) {
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pr_err("UBI: block: parameter \"%s\" is too long, max. is %d\n",
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val, UBIBLOCK_PARAM_LEN);
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return -EINVAL;
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}
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strcpy(buf, val);
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/* Get rid of the final newline */
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if (buf[len - 1] == '\n')
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buf[len - 1] = '\0';
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for (i = 0; i < UBIBLOCK_PARAM_COUNT; i++)
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tokens[i] = strsep(&pbuf, ",");
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param = &ubiblock_param[ubiblock_devs];
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if (tokens[1]) {
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/* Two parameters: can be 'ubi, vol_id' or 'ubi, vol_name' */
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ret = kstrtoint(tokens[0], 10, ¶m->ubi_num);
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if (ret < 0)
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return -EINVAL;
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/* Second param can be a number or a name */
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ret = kstrtoint(tokens[1], 10, ¶m->vol_id);
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if (ret < 0) {
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param->vol_id = -1;
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strcpy(param->name, tokens[1]);
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}
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} else {
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/* One parameter: must be device path */
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strcpy(param->name, tokens[0]);
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param->ubi_num = -1;
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param->vol_id = -1;
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}
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ubiblock_devs++;
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return 0;
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}
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static const struct kernel_param_ops ubiblock_param_ops = {
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.set = ubiblock_set_param,
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};
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module_param_cb(block, &ubiblock_param_ops, NULL, 0);
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MODULE_PARM_DESC(block, "Attach block devices to UBI volumes. Parameter format: block=<path|dev,num|dev,name>.\n"
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"Multiple \"block\" parameters may be specified.\n"
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"UBI volumes may be specified by their number, name, or path to the device node.\n"
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"Examples\n"
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"Using the UBI volume path:\n"
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"ubi.block=/dev/ubi0_0\n"
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"Using the UBI device, and the volume name:\n"
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"ubi.block=0,rootfs\n"
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"Using both UBI device number and UBI volume number:\n"
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"ubi.block=0,0\n");
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static struct ubiblock *find_dev_nolock(int ubi_num, int vol_id)
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{
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struct ubiblock *dev;
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list_for_each_entry(dev, &ubiblock_devices, list)
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if (dev->ubi_num == ubi_num && dev->vol_id == vol_id)
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return dev;
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return NULL;
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}
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static int ubiblock_read(struct ubiblock_pdu *pdu)
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{
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int ret, leb, offset, bytes_left, to_read;
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u64 pos;
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struct request *req = blk_mq_rq_from_pdu(pdu);
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struct ubiblock *dev = req->q->queuedata;
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to_read = blk_rq_bytes(req);
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pos = blk_rq_pos(req) << 9;
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/* Get LEB:offset address to read from */
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offset = do_div(pos, dev->leb_size);
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leb = pos;
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bytes_left = to_read;
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while (bytes_left) {
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/*
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* We can only read one LEB at a time. Therefore if the read
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* length is larger than one LEB size, we split the operation.
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*/
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if (offset + to_read > dev->leb_size)
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to_read = dev->leb_size - offset;
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ret = ubi_read_sg(dev->desc, leb, &pdu->usgl, offset, to_read);
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if (ret < 0)
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return ret;
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bytes_left -= to_read;
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to_read = bytes_left;
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leb += 1;
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offset = 0;
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}
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return 0;
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}
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static int ubiblock_open(struct block_device *bdev, fmode_t mode)
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{
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struct ubiblock *dev = bdev->bd_disk->private_data;
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int ret;
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mutex_lock(&dev->dev_mutex);
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if (dev->refcnt > 0) {
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/*
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* The volume is already open, just increase the reference
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* counter.
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*/
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goto out_done;
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}
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/*
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* We want users to be aware they should only mount us as read-only.
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* It's just a paranoid check, as write requests will get rejected
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* in any case.
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*/
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if (mode & FMODE_WRITE) {
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ret = -EPERM;
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goto out_unlock;
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}
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dev->desc = ubi_open_volume(dev->ubi_num, dev->vol_id, UBI_READONLY);
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if (IS_ERR(dev->desc)) {
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dev_err(disk_to_dev(dev->gd), "failed to open ubi volume %d_%d",
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dev->ubi_num, dev->vol_id);
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ret = PTR_ERR(dev->desc);
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dev->desc = NULL;
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goto out_unlock;
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}
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out_done:
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dev->refcnt++;
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mutex_unlock(&dev->dev_mutex);
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return 0;
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out_unlock:
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mutex_unlock(&dev->dev_mutex);
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return ret;
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}
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static void ubiblock_release(struct gendisk *gd, fmode_t mode)
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{
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struct ubiblock *dev = gd->private_data;
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mutex_lock(&dev->dev_mutex);
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dev->refcnt--;
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if (dev->refcnt == 0) {
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ubi_close_volume(dev->desc);
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dev->desc = NULL;
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}
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mutex_unlock(&dev->dev_mutex);
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}
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static int ubiblock_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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{
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/* Some tools might require this information */
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geo->heads = 1;
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geo->cylinders = 1;
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geo->sectors = get_capacity(bdev->bd_disk);
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geo->start = 0;
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return 0;
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}
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static const struct block_device_operations ubiblock_ops = {
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.owner = THIS_MODULE,
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.open = ubiblock_open,
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.release = ubiblock_release,
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.getgeo = ubiblock_getgeo,
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};
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static void ubiblock_do_work(struct work_struct *work)
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{
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int ret;
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struct ubiblock_pdu *pdu = container_of(work, struct ubiblock_pdu, work);
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struct request *req = blk_mq_rq_from_pdu(pdu);
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blk_mq_start_request(req);
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/*
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* It is safe to ignore the return value of blk_rq_map_sg() because
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* the number of sg entries is limited to UBI_MAX_SG_COUNT
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* and ubi_read_sg() will check that limit.
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*/
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blk_rq_map_sg(req->q, req, pdu->usgl.sg);
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ret = ubiblock_read(pdu);
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rq_flush_dcache_pages(req);
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blk_mq_end_request(req, errno_to_blk_status(ret));
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}
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static blk_status_t ubiblock_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *bd)
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{
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struct request *req = bd->rq;
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struct ubiblock *dev = hctx->queue->queuedata;
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struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req);
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switch (req_op(req)) {
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case REQ_OP_READ:
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ubi_sgl_init(&pdu->usgl);
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queue_work(dev->wq, &pdu->work);
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return BLK_STS_OK;
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default:
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return BLK_STS_IOERR;
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}
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}
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static int ubiblock_init_request(struct blk_mq_tag_set *set,
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struct request *req, unsigned int hctx_idx,
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unsigned int numa_node)
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{
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struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req);
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sg_init_table(pdu->usgl.sg, UBI_MAX_SG_COUNT);
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INIT_WORK(&pdu->work, ubiblock_do_work);
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return 0;
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}
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static const struct blk_mq_ops ubiblock_mq_ops = {
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.queue_rq = ubiblock_queue_rq,
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.init_request = ubiblock_init_request,
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};
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static DEFINE_IDR(ubiblock_minor_idr);
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int ubiblock_create(struct ubi_volume_info *vi)
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{
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struct ubiblock *dev;
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struct gendisk *gd;
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u64 disk_capacity = vi->used_bytes >> 9;
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int ret;
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if ((sector_t)disk_capacity != disk_capacity)
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return -EFBIG;
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/* Check that the volume isn't already handled */
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mutex_lock(&devices_mutex);
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if (find_dev_nolock(vi->ubi_num, vi->vol_id)) {
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mutex_unlock(&devices_mutex);
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return -EEXIST;
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}
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mutex_unlock(&devices_mutex);
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dev = kzalloc(sizeof(struct ubiblock), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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mutex_init(&dev->dev_mutex);
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dev->ubi_num = vi->ubi_num;
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dev->vol_id = vi->vol_id;
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dev->leb_size = vi->usable_leb_size;
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/* Initialize the gendisk of this ubiblock device */
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gd = alloc_disk(1);
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if (!gd) {
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pr_err("UBI: block: alloc_disk failed\n");
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ret = -ENODEV;
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goto out_free_dev;
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}
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gd->fops = &ubiblock_ops;
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gd->major = ubiblock_major;
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gd->first_minor = idr_alloc(&ubiblock_minor_idr, dev, 0, 0, GFP_KERNEL);
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if (gd->first_minor < 0) {
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dev_err(disk_to_dev(gd),
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"block: dynamic minor allocation failed");
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ret = -ENODEV;
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goto out_put_disk;
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}
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gd->private_data = dev;
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sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id);
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set_capacity(gd, disk_capacity);
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dev->gd = gd;
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dev->tag_set.ops = &ubiblock_mq_ops;
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dev->tag_set.queue_depth = 64;
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dev->tag_set.numa_node = NUMA_NO_NODE;
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dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
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dev->tag_set.cmd_size = sizeof(struct ubiblock_pdu);
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dev->tag_set.driver_data = dev;
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dev->tag_set.nr_hw_queues = 1;
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ret = blk_mq_alloc_tag_set(&dev->tag_set);
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if (ret) {
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dev_err(disk_to_dev(dev->gd), "blk_mq_alloc_tag_set failed");
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goto out_remove_minor;
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}
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dev->rq = blk_mq_init_queue(&dev->tag_set);
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if (IS_ERR(dev->rq)) {
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dev_err(disk_to_dev(gd), "blk_mq_init_queue failed");
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ret = PTR_ERR(dev->rq);
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goto out_free_tags;
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}
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blk_queue_max_segments(dev->rq, UBI_MAX_SG_COUNT);
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dev->rq->queuedata = dev;
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dev->gd->queue = dev->rq;
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/*
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* Create one workqueue per volume (per registered block device).
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* Rembember workqueues are cheap, they're not threads.
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*/
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dev->wq = alloc_workqueue("%s", 0, 0, gd->disk_name);
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if (!dev->wq) {
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ret = -ENOMEM;
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goto out_free_queue;
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}
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mutex_lock(&devices_mutex);
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list_add_tail(&dev->list, &ubiblock_devices);
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mutex_unlock(&devices_mutex);
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/* Must be the last step: anyone can call file ops from now on */
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add_disk(dev->gd);
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dev_info(disk_to_dev(dev->gd), "created from ubi%d:%d(%s)",
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dev->ubi_num, dev->vol_id, vi->name);
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return 0;
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out_free_queue:
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blk_cleanup_queue(dev->rq);
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out_free_tags:
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blk_mq_free_tag_set(&dev->tag_set);
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out_remove_minor:
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idr_remove(&ubiblock_minor_idr, gd->first_minor);
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out_put_disk:
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put_disk(dev->gd);
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out_free_dev:
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kfree(dev);
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return ret;
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}
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static void ubiblock_cleanup(struct ubiblock *dev)
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{
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/* Stop new requests to arrive */
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del_gendisk(dev->gd);
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/* Flush pending work */
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destroy_workqueue(dev->wq);
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/* Finally destroy the blk queue */
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blk_cleanup_queue(dev->rq);
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blk_mq_free_tag_set(&dev->tag_set);
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dev_info(disk_to_dev(dev->gd), "released");
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idr_remove(&ubiblock_minor_idr, dev->gd->first_minor);
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put_disk(dev->gd);
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}
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int ubiblock_remove(struct ubi_volume_info *vi)
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{
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struct ubiblock *dev;
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mutex_lock(&devices_mutex);
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dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
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if (!dev) {
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mutex_unlock(&devices_mutex);
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return -ENODEV;
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}
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/* Found a device, let's lock it so we can check if it's busy */
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mutex_lock(&dev->dev_mutex);
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if (dev->refcnt > 0) {
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mutex_unlock(&dev->dev_mutex);
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mutex_unlock(&devices_mutex);
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return -EBUSY;
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}
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/* Remove from device list */
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list_del(&dev->list);
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mutex_unlock(&devices_mutex);
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ubiblock_cleanup(dev);
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mutex_unlock(&dev->dev_mutex);
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kfree(dev);
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return 0;
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}
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static int ubiblock_resize(struct ubi_volume_info *vi)
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|
{
|
|
struct ubiblock *dev;
|
|
u64 disk_capacity = vi->used_bytes >> 9;
|
|
|
|
/*
|
|
* Need to lock the device list until we stop using the device,
|
|
* otherwise the device struct might get released in
|
|
* 'ubiblock_remove()'.
|
|
*/
|
|
mutex_lock(&devices_mutex);
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|
dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
|
|
if (!dev) {
|
|
mutex_unlock(&devices_mutex);
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|
return -ENODEV;
|
|
}
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|
if ((sector_t)disk_capacity != disk_capacity) {
|
|
mutex_unlock(&devices_mutex);
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|
dev_warn(disk_to_dev(dev->gd), "the volume is too big (%d LEBs), cannot resize",
|
|
vi->size);
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|
return -EFBIG;
|
|
}
|
|
|
|
mutex_lock(&dev->dev_mutex);
|
|
|
|
if (get_capacity(dev->gd) != disk_capacity) {
|
|
set_capacity(dev->gd, disk_capacity);
|
|
dev_info(disk_to_dev(dev->gd), "resized to %lld bytes",
|
|
vi->used_bytes);
|
|
}
|
|
mutex_unlock(&dev->dev_mutex);
|
|
mutex_unlock(&devices_mutex);
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|
return 0;
|
|
}
|
|
|
|
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 creation for
|
|
* volumes, so when a volume is added we do nothing.
|
|
*/
|
|
break;
|
|
case UBI_VOLUME_REMOVED:
|
|
ubiblock_remove(&nt->vi);
|
|
break;
|
|
case UBI_VOLUME_RESIZED:
|
|
ubiblock_resize(&nt->vi);
|
|
break;
|
|
case UBI_VOLUME_UPDATED:
|
|
/*
|
|
* If the volume is static, a content update might mean the
|
|
* size (i.e. used_bytes) was also changed.
|
|
*/
|
|
if (nt->vi.vol_type == UBI_STATIC_VOLUME)
|
|
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 void __init ubiblock_create_from_param(void)
|
|
{
|
|
int i, ret = 0;
|
|
struct ubiblock_param *p;
|
|
struct ubi_volume_desc *desc;
|
|
struct ubi_volume_info vi;
|
|
|
|
/*
|
|
* If there is an error creating one of the ubiblocks, continue on to
|
|
* create the following ubiblocks. This helps in a circumstance where
|
|
* the kernel command-line specifies multiple block devices and some
|
|
* may be broken, but we still want the working ones to come up.
|
|
*/
|
|
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)) {
|
|
pr_err(
|
|
"UBI: block: can't open volume on ubi%d_%d, err=%ld\n",
|
|
p->ubi_num, p->vol_id, PTR_ERR(desc));
|
|
continue;
|
|
}
|
|
|
|
ubi_get_volume_info(desc, &vi);
|
|
ubi_close_volume(desc);
|
|
|
|
ret = ubiblock_create(&vi);
|
|
if (ret) {
|
|
pr_err(
|
|
"UBI: block: can't add '%s' volume on ubi%d_%d, err=%d\n",
|
|
vi.name, p->ubi_num, p->vol_id, ret);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ubiblock_remove_all(void)
|
|
{
|
|
struct ubiblock *next;
|
|
struct ubiblock *dev;
|
|
|
|
list_for_each_entry_safe(dev, next, &ubiblock_devices, list) {
|
|
/* 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.
|
|
* Even if one block device in the param list fails to come up,
|
|
* still allow the module to load and leave any others up.
|
|
*/
|
|
ubiblock_create_from_param();
|
|
|
|
/*
|
|
* Block devices are only created upon user requests, 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");
|
|
ubiblock_remove_all();
|
|
return ret;
|
|
}
|
|
|
|
void __exit ubiblock_exit(void)
|
|
{
|
|
ubi_unregister_volume_notifier(&ubiblock_notifier);
|
|
ubiblock_remove_all();
|
|
unregister_blkdev(ubiblock_major, "ubiblock");
|
|
}
|