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22a8578fca
By replacing a kthread with a workqueue, the code is now a bit clearer. There's also a slight reduction of code size (numbers apply for x86): Before: text data bss dec hex filename 3248 36 0 3284 cd4 drivers/mtd/mtd_blkdevs.o After: text data bss dec hex filename 3150 36 0 3186 c72 drivers/mtd/mtd_blkdevs.o Due to lack of real hardware, tests have been performed on an emulated environment with mtdswap and mtdblock over nandsim devices. Some real testing should be done, before merging this patch. Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
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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
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* 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
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* 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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#ifndef __MTD_TRANS_H__
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#define __MTD_TRANS_H__
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#include <linux/mutex.h>
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#include <linux/kref.h>
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#include <linux/sysfs.h>
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#include <linux/workqueue.h>
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struct hd_geometry;
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struct mtd_info;
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struct mtd_blktrans_ops;
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struct file;
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struct inode;
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struct mtd_blktrans_dev {
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struct mtd_blktrans_ops *tr;
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struct list_head list;
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struct mtd_info *mtd;
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struct mutex lock;
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int devnum;
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bool bg_stop;
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unsigned long size;
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int readonly;
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int open;
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struct kref ref;
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struct gendisk *disk;
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struct attribute_group *disk_attributes;
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struct workqueue_struct *wq;
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struct work_struct work;
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struct request_queue *rq;
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spinlock_t queue_lock;
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void *priv;
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fmode_t file_mode;
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};
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struct mtd_blktrans_ops {
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char *name;
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int major;
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int part_bits;
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int blksize;
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int blkshift;
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/* Access functions */
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int (*readsect)(struct mtd_blktrans_dev *dev,
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unsigned long block, char *buffer);
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int (*writesect)(struct mtd_blktrans_dev *dev,
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unsigned long block, char *buffer);
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int (*discard)(struct mtd_blktrans_dev *dev,
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unsigned long block, unsigned nr_blocks);
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void (*background)(struct mtd_blktrans_dev *dev);
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/* Block layer ioctls */
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int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
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int (*flush)(struct mtd_blktrans_dev *dev);
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/* Called with mtd_table_mutex held; no race with add/remove */
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int (*open)(struct mtd_blktrans_dev *dev);
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int (*release)(struct mtd_blktrans_dev *dev);
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/* Called on {de,}registration and on subsequent addition/removal
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of devices, with mtd_table_mutex held. */
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void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
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void (*remove_dev)(struct mtd_blktrans_dev *dev);
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struct list_head devs;
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struct list_head list;
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struct module *owner;
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};
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extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
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extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
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extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
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extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
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extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
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#endif /* __MTD_TRANS_H__ */
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