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![Christoph Hellwig](/assets/img/avatar_default.png)
blk_cleanup_disk is nothing but a trivial wrapper for put_disk now, so remove it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Link: https://lore.kernel.org/r/20220619060552.1850436-7-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
548 lines
12 KiB
C
548 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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#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/blk-mq.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 <linux/uaccess.h>
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#include "mtdcore.h"
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static LIST_HEAD(blktrans_majors);
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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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put_disk(dev->disk);
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blk_mq_free_tag_set(dev->tag_set);
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kfree(dev->tag_set);
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list_del(&dev->list);
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kfree(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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kref_put(&dev->ref, blktrans_dev_release);
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}
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static blk_status_t 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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struct req_iterator iter;
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struct bio_vec bvec;
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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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switch (req_op(req)) {
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case REQ_OP_FLUSH:
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if (tr->flush(dev))
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return BLK_STS_IOERR;
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return BLK_STS_OK;
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case REQ_OP_DISCARD:
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if (tr->discard(dev, block, nsect))
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return BLK_STS_IOERR;
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return BLK_STS_OK;
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case REQ_OP_READ:
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buf = kmap(bio_page(req->bio)) + bio_offset(req->bio);
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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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kunmap(bio_page(req->bio));
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return BLK_STS_IOERR;
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}
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}
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kunmap(bio_page(req->bio));
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rq_for_each_segment(bvec, req, iter)
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flush_dcache_page(bvec.bv_page);
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return BLK_STS_OK;
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case REQ_OP_WRITE:
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if (!tr->writesect)
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return BLK_STS_IOERR;
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rq_for_each_segment(bvec, req, iter)
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flush_dcache_page(bvec.bv_page);
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buf = kmap(bio_page(req->bio)) + bio_offset(req->bio);
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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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kunmap(bio_page(req->bio));
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return BLK_STS_IOERR;
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}
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}
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kunmap(bio_page(req->bio));
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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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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 struct request *mtd_next_request(struct mtd_blktrans_dev *dev)
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{
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struct request *rq;
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rq = list_first_entry_or_null(&dev->rq_list, struct request, queuelist);
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if (rq) {
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list_del_init(&rq->queuelist);
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blk_mq_start_request(rq);
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return rq;
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}
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return NULL;
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}
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static void mtd_blktrans_work(struct mtd_blktrans_dev *dev)
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__releases(&dev->queue_lock)
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__acquires(&dev->queue_lock)
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{
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struct mtd_blktrans_ops *tr = dev->tr;
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struct request *req = NULL;
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int background_done = 0;
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while (1) {
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blk_status_t res;
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dev->bg_stop = false;
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if (!req && !(req = mtd_next_request(dev))) {
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if (tr->background && !background_done) {
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spin_unlock_irq(&dev->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(&dev->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(&dev->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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if (!blk_update_request(req, res, blk_rq_cur_bytes(req))) {
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__blk_mq_end_request(req, res);
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req = NULL;
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}
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background_done = 0;
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cond_resched();
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spin_lock_irq(&dev->queue_lock);
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}
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}
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static blk_status_t mtd_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 mtd_blktrans_dev *dev;
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dev = hctx->queue->queuedata;
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if (!dev) {
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blk_mq_start_request(bd->rq);
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return BLK_STS_IOERR;
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}
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spin_lock_irq(&dev->queue_lock);
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list_add_tail(&bd->rq->queuelist, &dev->rq_list);
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mtd_blktrans_work(dev);
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spin_unlock_irq(&dev->queue_lock);
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return BLK_STS_OK;
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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 = bdev->bd_disk->private_data;
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int ret = 0;
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kref_get(&dev->ref);
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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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__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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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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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 = disk->private_data;
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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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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 = bdev->bd_disk->private_data;
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int ret = -ENXIO;
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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) : -ENOTTY;
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unlock:
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mutex_unlock(&dev->lock);
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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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.getgeo = blktrans_getgeo,
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};
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static const struct blk_mq_ops mtd_mq_ops = {
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.queue_rq = mtd_queue_rq,
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};
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int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
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{
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struct mtd_blktrans_ops *tr = new->tr;
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struct mtd_blktrans_dev *d;
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int last_devnum = -1;
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struct gendisk *gd;
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int ret;
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lockdep_assert_held(&mtd_table_mutex);
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list_for_each_entry(d, &tr->devs, list) {
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if (new->devnum == -1) {
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/* Use first free number */
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if (d->devnum != last_devnum+1) {
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/* Found a free devnum. Plug it in here */
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new->devnum = last_devnum+1;
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list_add_tail(&new->list, &d->list);
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goto added;
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}
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} else if (d->devnum == new->devnum) {
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/* Required number taken */
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return -EBUSY;
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} else if (d->devnum > new->devnum) {
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/* Required number was free */
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list_add_tail(&new->list, &d->list);
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goto added;
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}
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last_devnum = d->devnum;
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}
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ret = -EBUSY;
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if (new->devnum == -1)
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new->devnum = last_devnum+1;
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/* Check that the device and any partitions will get valid
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* minor numbers and that the disk naming code below can cope
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* with this number. */
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if (new->devnum > (MINORMASK >> tr->part_bits) ||
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(tr->part_bits && new->devnum >= 27 * 26))
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return ret;
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list_add_tail(&new->list, &tr->devs);
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added:
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mutex_init(&new->lock);
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kref_init(&new->ref);
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if (!tr->writesect)
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new->readonly = 1;
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ret = -ENOMEM;
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new->tag_set = kzalloc(sizeof(*new->tag_set), GFP_KERNEL);
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if (!new->tag_set)
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goto out_list_del;
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ret = blk_mq_alloc_sq_tag_set(new->tag_set, &mtd_mq_ops, 2,
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BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
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if (ret)
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goto out_kfree_tag_set;
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/* Create gendisk */
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gd = blk_mq_alloc_disk(new->tag_set, new);
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if (IS_ERR(gd)) {
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ret = PTR_ERR(gd);
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goto out_free_tag_set;
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}
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new->disk = gd;
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new->rq = new->disk->queue;
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gd->private_data = new;
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gd->major = tr->major;
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gd->first_minor = (new->devnum) << tr->part_bits;
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gd->minors = 1 << tr->part_bits;
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gd->fops = &mtd_block_ops;
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if (tr->part_bits) {
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if (new->devnum < 26)
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snprintf(gd->disk_name, sizeof(gd->disk_name),
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"%s%c", tr->name, 'a' + new->devnum);
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else
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snprintf(gd->disk_name, sizeof(gd->disk_name),
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"%s%c%c", tr->name,
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'a' - 1 + new->devnum / 26,
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'a' + new->devnum % 26);
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} else {
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snprintf(gd->disk_name, sizeof(gd->disk_name),
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"%s%d", tr->name, new->devnum);
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gd->flags |= GENHD_FL_NO_PART;
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}
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set_capacity(gd, ((u64)new->size * tr->blksize) >> 9);
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/* Create the request queue */
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spin_lock_init(&new->queue_lock);
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INIT_LIST_HEAD(&new->rq_list);
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if (tr->flush)
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blk_queue_write_cache(new->rq, true, false);
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blk_queue_logical_block_size(new->rq, tr->blksize);
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blk_queue_flag_set(QUEUE_FLAG_NONROT, new->rq);
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blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, new->rq);
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if (tr->discard) {
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blk_queue_max_discard_sectors(new->rq, UINT_MAX);
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new->rq->limits.discard_granularity = tr->blksize;
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}
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gd->queue = new->rq;
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if (new->readonly)
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set_disk_ro(gd, 1);
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ret = device_add_disk(&new->mtd->dev, gd, NULL);
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if (ret)
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goto out_cleanup_disk;
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if (new->disk_attributes) {
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ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
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new->disk_attributes);
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WARN_ON(ret);
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}
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return 0;
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out_cleanup_disk:
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put_disk(new->disk);
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out_free_tag_set:
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blk_mq_free_tag_set(new->tag_set);
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out_kfree_tag_set:
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kfree(new->tag_set);
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out_list_del:
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list_del(&new->list);
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return ret;
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}
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int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
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{
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unsigned long flags;
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lockdep_assert_held(&mtd_table_mutex);
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if (old->disk_attributes)
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sysfs_remove_group(&disk_to_dev(old->disk)->kobj,
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old->disk_attributes);
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/* Stop new requests to arrive */
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del_gendisk(old->disk);
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/* Kill current requests */
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spin_lock_irqsave(&old->queue_lock, flags);
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old->rq->queuedata = NULL;
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spin_unlock_irqrestore(&old->queue_lock, flags);
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/* freeze+quiesce queue to ensure all requests are flushed */
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blk_mq_freeze_queue(old->rq);
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blk_mq_quiesce_queue(old->rq);
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blk_mq_unquiesce_queue(old->rq);
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blk_mq_unfreeze_queue(old->rq);
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/* If the device is currently open, tell trans driver to close it,
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then put mtd device, and don't touch it again */
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mutex_lock(&old->lock);
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if (old->open) {
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if (old->tr->release)
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old->tr->release(old);
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__put_mtd_device(old->mtd);
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}
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old->mtd = NULL;
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mutex_unlock(&old->lock);
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blktrans_dev_put(old);
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return 0;
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}
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static void blktrans_notify_remove(struct mtd_info *mtd)
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{
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struct mtd_blktrans_ops *tr;
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struct mtd_blktrans_dev *dev, *next;
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list_for_each_entry(tr, &blktrans_majors, list)
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list_for_each_entry_safe(dev, next, &tr->devs, list)
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if (dev->mtd == mtd)
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tr->remove_dev(dev);
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}
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static void blktrans_notify_add(struct mtd_info *mtd)
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{
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struct mtd_blktrans_ops *tr;
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if (mtd->type == MTD_ABSENT)
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return;
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list_for_each_entry(tr, &blktrans_majors, list)
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tr->add_mtd(tr, mtd);
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}
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static struct mtd_notifier blktrans_notifier = {
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.add = blktrans_notify_add,
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.remove = blktrans_notify_remove,
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};
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int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
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{
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struct mtd_info *mtd;
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int ret;
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/* Register the notifier if/when the first device type is
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registered, to prevent the link/init ordering from fucking
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us over. */
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if (!blktrans_notifier.list.next)
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register_mtd_user(&blktrans_notifier);
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ret = register_blkdev(tr->major, tr->name);
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if (ret < 0) {
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printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
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tr->name, tr->major, ret);
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return ret;
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}
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if (ret)
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tr->major = ret;
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tr->blkshift = ffs(tr->blksize) - 1;
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INIT_LIST_HEAD(&tr->devs);
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mutex_lock(&mtd_table_mutex);
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list_add(&tr->list, &blktrans_majors);
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mtd_for_each_device(mtd)
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if (mtd->type != MTD_ABSENT)
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tr->add_mtd(tr, mtd);
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mutex_unlock(&mtd_table_mutex);
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return 0;
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}
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int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr)
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{
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struct mtd_blktrans_dev *dev, *next;
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mutex_lock(&mtd_table_mutex);
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/* Remove it from the list of active majors */
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list_del(&tr->list);
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|
list_for_each_entry_safe(dev, next, &tr->devs, list)
|
|
tr->remove_dev(dev);
|
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
unregister_blkdev(tr->major, tr->name);
|
|
|
|
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'");
|