mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 09:08:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
601
drivers/mtd/mtd_blkdevs.c
Normal file
601
drivers/mtd/mtd_blkdevs.c
Normal file
|
|
@ -0,0 +1,601 @@
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|||
/*
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* Interface to Linux block layer for MTD 'translation layers'.
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*
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* Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
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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; either version 2 of the License, or
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* (at your option) any later version.
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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 the
|
||||
* GNU General Public License for more details.
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*
|
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* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/fs.h>
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#include <linux/mtd/blktrans.h>
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#include <linux/mtd/mtd.h>
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/spinlock.h>
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#include <linux/hdreg.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include "mtdcore.h"
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static LIST_HEAD(blktrans_majors);
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static DEFINE_MUTEX(blktrans_ref_mutex);
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static void blktrans_dev_release(struct kref *kref)
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{
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struct mtd_blktrans_dev *dev =
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container_of(kref, struct mtd_blktrans_dev, ref);
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dev->disk->private_data = NULL;
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blk_cleanup_queue(dev->rq);
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put_disk(dev->disk);
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list_del(&dev->list);
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kfree(dev);
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}
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static struct mtd_blktrans_dev *blktrans_dev_get(struct gendisk *disk)
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{
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struct mtd_blktrans_dev *dev;
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mutex_lock(&blktrans_ref_mutex);
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dev = disk->private_data;
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if (!dev)
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goto unlock;
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kref_get(&dev->ref);
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unlock:
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mutex_unlock(&blktrans_ref_mutex);
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return dev;
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}
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static void blktrans_dev_put(struct mtd_blktrans_dev *dev)
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{
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mutex_lock(&blktrans_ref_mutex);
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kref_put(&dev->ref, blktrans_dev_release);
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mutex_unlock(&blktrans_ref_mutex);
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}
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static int do_blktrans_request(struct mtd_blktrans_ops *tr,
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struct mtd_blktrans_dev *dev,
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struct request *req)
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{
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unsigned long block, nsect;
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char *buf;
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block = blk_rq_pos(req) << 9 >> tr->blkshift;
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nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
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buf = bio_data(req->bio);
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if (req->cmd_type != REQ_TYPE_FS)
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return -EIO;
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if (req->cmd_flags & REQ_FLUSH)
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return tr->flush(dev);
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if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
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get_capacity(req->rq_disk))
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return -EIO;
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if (req->cmd_flags & REQ_DISCARD)
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return tr->discard(dev, block, nsect);
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switch(rq_data_dir(req)) {
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case READ:
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for (; nsect > 0; nsect--, block++, buf += tr->blksize)
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if (tr->readsect(dev, block, buf))
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return -EIO;
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rq_flush_dcache_pages(req);
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return 0;
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case WRITE:
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if (!tr->writesect)
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return -EIO;
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rq_flush_dcache_pages(req);
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for (; nsect > 0; nsect--, block++, buf += tr->blksize)
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if (tr->writesect(dev, block, buf))
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return -EIO;
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return 0;
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default:
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printk(KERN_NOTICE "Unknown request %u\n", rq_data_dir(req));
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return -EIO;
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}
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}
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int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev)
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{
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return dev->bg_stop;
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}
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EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background);
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static void mtd_blktrans_work(struct work_struct *work)
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{
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struct mtd_blktrans_dev *dev =
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container_of(work, struct mtd_blktrans_dev, work);
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struct mtd_blktrans_ops *tr = dev->tr;
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struct request_queue *rq = dev->rq;
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struct request *req = NULL;
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int background_done = 0;
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spin_lock_irq(rq->queue_lock);
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while (1) {
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int res;
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dev->bg_stop = false;
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if (!req && !(req = blk_fetch_request(rq))) {
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if (tr->background && !background_done) {
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spin_unlock_irq(rq->queue_lock);
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mutex_lock(&dev->lock);
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tr->background(dev);
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mutex_unlock(&dev->lock);
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spin_lock_irq(rq->queue_lock);
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/*
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* Do background processing just once per idle
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* period.
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*/
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background_done = !dev->bg_stop;
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continue;
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}
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break;
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}
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spin_unlock_irq(rq->queue_lock);
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mutex_lock(&dev->lock);
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res = do_blktrans_request(dev->tr, dev, req);
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mutex_unlock(&dev->lock);
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spin_lock_irq(rq->queue_lock);
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if (!__blk_end_request_cur(req, res))
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req = NULL;
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background_done = 0;
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}
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if (req)
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__blk_end_request_all(req, -EIO);
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spin_unlock_irq(rq->queue_lock);
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}
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static void mtd_blktrans_request(struct request_queue *rq)
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{
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struct mtd_blktrans_dev *dev;
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struct request *req = NULL;
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dev = rq->queuedata;
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if (!dev)
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while ((req = blk_fetch_request(rq)) != NULL)
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__blk_end_request_all(req, -ENODEV);
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else
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queue_work(dev->wq, &dev->work);
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}
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static int blktrans_open(struct block_device *bdev, fmode_t mode)
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{
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struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
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int ret = 0;
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if (!dev)
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return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
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mutex_lock(&dev->lock);
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if (dev->open)
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goto unlock;
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kref_get(&dev->ref);
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__module_get(dev->tr->owner);
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if (!dev->mtd)
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goto unlock;
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if (dev->tr->open) {
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ret = dev->tr->open(dev);
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if (ret)
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goto error_put;
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}
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ret = __get_mtd_device(dev->mtd);
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if (ret)
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goto error_release;
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dev->file_mode = mode;
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unlock:
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dev->open++;
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mutex_unlock(&dev->lock);
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blktrans_dev_put(dev);
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return ret;
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error_release:
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if (dev->tr->release)
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dev->tr->release(dev);
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error_put:
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module_put(dev->tr->owner);
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kref_put(&dev->ref, blktrans_dev_release);
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mutex_unlock(&dev->lock);
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blktrans_dev_put(dev);
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return ret;
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}
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static void blktrans_release(struct gendisk *disk, fmode_t mode)
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{
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struct mtd_blktrans_dev *dev = blktrans_dev_get(disk);
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if (!dev)
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return;
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mutex_lock(&dev->lock);
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if (--dev->open)
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goto unlock;
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kref_put(&dev->ref, blktrans_dev_release);
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module_put(dev->tr->owner);
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if (dev->mtd) {
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if (dev->tr->release)
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dev->tr->release(dev);
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__put_mtd_device(dev->mtd);
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}
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unlock:
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mutex_unlock(&dev->lock);
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blktrans_dev_put(dev);
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}
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static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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{
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struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
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int ret = -ENXIO;
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if (!dev)
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return ret;
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mutex_lock(&dev->lock);
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if (!dev->mtd)
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goto unlock;
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ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : 0;
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unlock:
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mutex_unlock(&dev->lock);
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blktrans_dev_put(dev);
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return ret;
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}
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static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
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int ret = -ENXIO;
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if (!dev)
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return ret;
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mutex_lock(&dev->lock);
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if (!dev->mtd)
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goto unlock;
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switch (cmd) {
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case BLKFLSBUF:
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ret = dev->tr->flush ? dev->tr->flush(dev) : 0;
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break;
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default:
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ret = -ENOTTY;
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}
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unlock:
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mutex_unlock(&dev->lock);
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blktrans_dev_put(dev);
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return ret;
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}
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static const struct block_device_operations mtd_block_ops = {
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.owner = THIS_MODULE,
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.open = blktrans_open,
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.release = blktrans_release,
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.ioctl = blktrans_ioctl,
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.getgeo = blktrans_getgeo,
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||||
};
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||||
|
||||
int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
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||||
{
|
||||
struct mtd_blktrans_ops *tr = new->tr;
|
||||
struct mtd_blktrans_dev *d;
|
||||
int last_devnum = -1;
|
||||
struct gendisk *gd;
|
||||
int ret;
|
||||
|
||||
if (mutex_trylock(&mtd_table_mutex)) {
|
||||
mutex_unlock(&mtd_table_mutex);
|
||||
BUG();
|
||||
}
|
||||
|
||||
mutex_lock(&blktrans_ref_mutex);
|
||||
list_for_each_entry(d, &tr->devs, list) {
|
||||
if (new->devnum == -1) {
|
||||
/* Use first free number */
|
||||
if (d->devnum != last_devnum+1) {
|
||||
/* Found a free devnum. Plug it in here */
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||||
new->devnum = last_devnum+1;
|
||||
list_add_tail(&new->list, &d->list);
|
||||
goto added;
|
||||
}
|
||||
} else if (d->devnum == new->devnum) {
|
||||
/* Required number taken */
|
||||
mutex_unlock(&blktrans_ref_mutex);
|
||||
return -EBUSY;
|
||||
} else if (d->devnum > new->devnum) {
|
||||
/* Required number was free */
|
||||
list_add_tail(&new->list, &d->list);
|
||||
goto added;
|
||||
}
|
||||
last_devnum = d->devnum;
|
||||
}
|
||||
|
||||
ret = -EBUSY;
|
||||
if (new->devnum == -1)
|
||||
new->devnum = last_devnum+1;
|
||||
|
||||
/* Check that the device and any partitions will get valid
|
||||
* minor numbers and that the disk naming code below can cope
|
||||
* with this number. */
|
||||
if (new->devnum > (MINORMASK >> tr->part_bits) ||
|
||||
(tr->part_bits && new->devnum >= 27 * 26)) {
|
||||
mutex_unlock(&blktrans_ref_mutex);
|
||||
goto error1;
|
||||
}
|
||||
|
||||
list_add_tail(&new->list, &tr->devs);
|
||||
added:
|
||||
mutex_unlock(&blktrans_ref_mutex);
|
||||
|
||||
mutex_init(&new->lock);
|
||||
kref_init(&new->ref);
|
||||
if (!tr->writesect)
|
||||
new->readonly = 1;
|
||||
|
||||
/* Create gendisk */
|
||||
ret = -ENOMEM;
|
||||
gd = alloc_disk(1 << tr->part_bits);
|
||||
|
||||
if (!gd)
|
||||
goto error2;
|
||||
|
||||
new->disk = gd;
|
||||
gd->private_data = new;
|
||||
gd->major = tr->major;
|
||||
gd->first_minor = (new->devnum) << tr->part_bits;
|
||||
gd->fops = &mtd_block_ops;
|
||||
|
||||
if (tr->part_bits)
|
||||
if (new->devnum < 26)
|
||||
snprintf(gd->disk_name, sizeof(gd->disk_name),
|
||||
"%s%c", tr->name, 'a' + new->devnum);
|
||||
else
|
||||
snprintf(gd->disk_name, sizeof(gd->disk_name),
|
||||
"%s%c%c", tr->name,
|
||||
'a' - 1 + new->devnum / 26,
|
||||
'a' + new->devnum % 26);
|
||||
else
|
||||
snprintf(gd->disk_name, sizeof(gd->disk_name),
|
||||
"%s%d", tr->name, new->devnum);
|
||||
|
||||
set_capacity(gd, (new->size * tr->blksize) >> 9);
|
||||
|
||||
/* Create the request queue */
|
||||
spin_lock_init(&new->queue_lock);
|
||||
new->rq = blk_init_queue(mtd_blktrans_request, &new->queue_lock);
|
||||
|
||||
if (!new->rq)
|
||||
goto error3;
|
||||
|
||||
if (tr->flush)
|
||||
blk_queue_flush(new->rq, REQ_FLUSH);
|
||||
|
||||
new->rq->queuedata = new;
|
||||
blk_queue_logical_block_size(new->rq, tr->blksize);
|
||||
|
||||
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, new->rq);
|
||||
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, new->rq);
|
||||
|
||||
if (tr->discard) {
|
||||
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq);
|
||||
new->rq->limits.max_discard_sectors = UINT_MAX;
|
||||
}
|
||||
|
||||
gd->queue = new->rq;
|
||||
|
||||
/* Create processing workqueue */
|
||||
new->wq = alloc_workqueue("%s%d", 0, 0,
|
||||
tr->name, new->mtd->index);
|
||||
if (!new->wq)
|
||||
goto error4;
|
||||
INIT_WORK(&new->work, mtd_blktrans_work);
|
||||
|
||||
gd->driverfs_dev = &new->mtd->dev;
|
||||
|
||||
if (new->readonly)
|
||||
set_disk_ro(gd, 1);
|
||||
|
||||
add_disk(gd);
|
||||
|
||||
if (new->disk_attributes) {
|
||||
ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
|
||||
new->disk_attributes);
|
||||
WARN_ON(ret);
|
||||
}
|
||||
return 0;
|
||||
error4:
|
||||
blk_cleanup_queue(new->rq);
|
||||
error3:
|
||||
put_disk(new->disk);
|
||||
error2:
|
||||
list_del(&new->list);
|
||||
error1:
|
||||
return ret;
|
||||
}
|
||||
|
||||
int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
if (mutex_trylock(&mtd_table_mutex)) {
|
||||
mutex_unlock(&mtd_table_mutex);
|
||||
BUG();
|
||||
}
|
||||
|
||||
if (old->disk_attributes)
|
||||
sysfs_remove_group(&disk_to_dev(old->disk)->kobj,
|
||||
old->disk_attributes);
|
||||
|
||||
/* Stop new requests to arrive */
|
||||
del_gendisk(old->disk);
|
||||
|
||||
/* Stop workqueue. This will perform any pending request. */
|
||||
destroy_workqueue(old->wq);
|
||||
|
||||
/* Kill current requests */
|
||||
spin_lock_irqsave(&old->queue_lock, flags);
|
||||
old->rq->queuedata = NULL;
|
||||
blk_start_queue(old->rq);
|
||||
spin_unlock_irqrestore(&old->queue_lock, flags);
|
||||
|
||||
/* If the device is currently open, tell trans driver to close it,
|
||||
then put mtd device, and don't touch it again */
|
||||
mutex_lock(&old->lock);
|
||||
if (old->open) {
|
||||
if (old->tr->release)
|
||||
old->tr->release(old);
|
||||
__put_mtd_device(old->mtd);
|
||||
}
|
||||
|
||||
old->mtd = NULL;
|
||||
|
||||
mutex_unlock(&old->lock);
|
||||
blktrans_dev_put(old);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void blktrans_notify_remove(struct mtd_info *mtd)
|
||||
{
|
||||
struct mtd_blktrans_ops *tr;
|
||||
struct mtd_blktrans_dev *dev, *next;
|
||||
|
||||
list_for_each_entry(tr, &blktrans_majors, list)
|
||||
list_for_each_entry_safe(dev, next, &tr->devs, list)
|
||||
if (dev->mtd == mtd)
|
||||
tr->remove_dev(dev);
|
||||
}
|
||||
|
||||
static void blktrans_notify_add(struct mtd_info *mtd)
|
||||
{
|
||||
struct mtd_blktrans_ops *tr;
|
||||
|
||||
if (mtd->type == MTD_ABSENT)
|
||||
return;
|
||||
|
||||
list_for_each_entry(tr, &blktrans_majors, list)
|
||||
tr->add_mtd(tr, mtd);
|
||||
}
|
||||
|
||||
static struct mtd_notifier blktrans_notifier = {
|
||||
.add = blktrans_notify_add,
|
||||
.remove = blktrans_notify_remove,
|
||||
};
|
||||
|
||||
int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
|
||||
{
|
||||
struct mtd_info *mtd;
|
||||
int ret;
|
||||
|
||||
/* Register the notifier if/when the first device type is
|
||||
registered, to prevent the link/init ordering from fucking
|
||||
us over. */
|
||||
if (!blktrans_notifier.list.next)
|
||||
register_mtd_user(&blktrans_notifier);
|
||||
|
||||
|
||||
mutex_lock(&mtd_table_mutex);
|
||||
|
||||
ret = register_blkdev(tr->major, tr->name);
|
||||
if (ret < 0) {
|
||||
printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
|
||||
tr->name, tr->major, ret);
|
||||
mutex_unlock(&mtd_table_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (ret)
|
||||
tr->major = ret;
|
||||
|
||||
tr->blkshift = ffs(tr->blksize) - 1;
|
||||
|
||||
INIT_LIST_HEAD(&tr->devs);
|
||||
list_add(&tr->list, &blktrans_majors);
|
||||
|
||||
mtd_for_each_device(mtd)
|
||||
if (mtd->type != MTD_ABSENT)
|
||||
tr->add_mtd(tr, mtd);
|
||||
|
||||
mutex_unlock(&mtd_table_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
|
||||
{
|
||||
struct mtd_blktrans_dev *dev, *next;
|
||||
|
||||
mutex_lock(&mtd_table_mutex);
|
||||
|
||||
/* Remove it from the list of active majors */
|
||||
list_del(&tr->list);
|
||||
|
||||
list_for_each_entry_safe(dev, next, &tr->devs, list)
|
||||
tr->remove_dev(dev);
|
||||
|
||||
unregister_blkdev(tr->major, tr->name);
|
||||
mutex_unlock(&mtd_table_mutex);
|
||||
|
||||
BUG_ON(!list_empty(&tr->devs));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit mtd_blktrans_exit(void)
|
||||
{
|
||||
/* No race here -- if someone's currently in register_mtd_blktrans
|
||||
we're screwed anyway. */
|
||||
if (blktrans_notifier.list.next)
|
||||
unregister_mtd_user(&blktrans_notifier);
|
||||
}
|
||||
|
||||
module_exit(mtd_blktrans_exit);
|
||||
|
||||
EXPORT_SYMBOL_GPL(register_mtd_blktrans);
|
||||
EXPORT_SYMBOL_GPL(deregister_mtd_blktrans);
|
||||
EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev);
|
||||
EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev);
|
||||
|
||||
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'");
|
||||
Loading…
Add table
Add a link
Reference in a new issue