383 lines
7.5 KiB
C
383 lines
7.5 KiB
C
/*
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* devfs.c - a device file system for barebox
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 version 2
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* as published by the Free Software Foundation.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <malloc.h>
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#include <fs.h>
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#include <command.h>
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#include <errno.h>
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#include <xfuncs.h>
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#include <linux/stat.h>
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#include <ioctl.h>
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#include <nand.h>
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#include <linux/mtd/mtd-abi.h>
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#include <partition.h>
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static LIST_HEAD(cdev_list);
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struct cdev *cdev_by_name(const char *filename)
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{
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struct cdev *cdev;
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list_for_each_entry(cdev, &cdev_list, list) {
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if (!strcmp(cdev->name, filename))
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return cdev;
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}
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return NULL;
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}
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ssize_t cdev_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
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{
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if (!cdev->ops->read)
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return -ENOSYS;
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return cdev->ops->read(cdev, buf, count, cdev->offset +offset, flags);
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}
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ssize_t cdev_write(struct cdev *cdev, const void *buf, size_t count, ulong offset, ulong flags)
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{
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if (!cdev->ops->write)
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return -ENOSYS;
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return cdev->ops->write(cdev, buf, count, cdev->offset + offset, flags);
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}
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static int devfs_read(struct device_d *_dev, FILE *f, void *buf, size_t size)
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{
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struct cdev *cdev = f->inode;
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return cdev_read(cdev, buf, size, f->pos, f->flags);
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}
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static int devfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t size)
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{
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struct cdev *cdev = f->inode;
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return cdev_write(cdev, buf, size, f->pos, f->flags);
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}
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static off_t devfs_lseek(struct device_d *_dev, FILE *f, off_t pos)
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{
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struct cdev *cdev = f->inode;
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off_t ret = -1;
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if (cdev->ops->lseek)
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ret = cdev->ops->lseek(cdev, pos + cdev->offset);
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if (ret != -1)
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f->pos = pos;
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return ret - cdev->offset;
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}
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static int devfs_erase(struct device_d *_dev, FILE *f, size_t count, unsigned long offset)
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{
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struct cdev *cdev = f->inode;
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if (!cdev->ops->erase)
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return -ENOSYS;
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return cdev->ops->erase(cdev, count, offset + cdev->offset);
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}
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static int devfs_protect(struct device_d *_dev, FILE *f, size_t count, unsigned long offset, int prot)
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{
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struct cdev *cdev = f->inode;
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if (!cdev->ops->protect)
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return -ENOSYS;
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return cdev->ops->protect(cdev, count, offset + cdev->offset, prot);
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}
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static int devfs_memmap(struct device_d *_dev, FILE *f, void **map, int flags)
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{
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struct cdev *cdev = f->inode;
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int ret = -ENOSYS;
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if (!cdev->ops->memmap)
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return -EINVAL;
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ret = cdev->ops->memmap(cdev, map, flags);
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if (!ret)
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*map = (void *)((unsigned long)*map + cdev->offset);
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return ret;
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}
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static int devfs_open(struct device_d *_dev, FILE *f, const char *filename)
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{
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struct cdev *cdev;
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int ret;
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cdev = cdev_by_name(filename + 1);
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if (!cdev)
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return -ENOENT;
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f->size = cdev->size;
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f->inode = cdev;
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if (cdev->ops->open) {
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ret = cdev->ops->open(cdev, f);
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if (ret)
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return ret;
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}
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cdev->open++;
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return 0;
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}
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static int devfs_close(struct device_d *_dev, FILE *f)
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{
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struct cdev *cdev = f->inode;
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int ret;
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if (cdev->ops->close) {
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ret = cdev->ops->close(cdev, f);
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if (ret)
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return ret;
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}
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cdev->open--;
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return 0;
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}
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static int partition_ioctl(struct cdev *cdev, int request, void *buf)
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{
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size_t offset;
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switch (request) {
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case MEMSETBADBLOCK:
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case MEMGETBADBLOCK:
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offset = (off_t)buf;
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offset += cdev->offset;
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return cdev->ops->ioctl(cdev, request, (void *)offset);
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case MEMGETINFO:
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return cdev->ops->ioctl(cdev, request, buf);
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default:
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return -EINVAL;
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}
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}
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static int devfs_ioctl(struct device_d *_dev, FILE *f, int request, void *buf)
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{
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struct cdev *cdev = f->inode;
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int ret = -EINVAL;
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if (!cdev->ops->ioctl)
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goto out;
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if (cdev->flags & DEVFS_IS_PARTITION)
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ret = partition_ioctl(cdev, request, buf);
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else
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ret = cdev->ops->ioctl(cdev, request, buf);
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out:
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return ret;
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}
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static int devfs_truncate(struct device_d *dev, FILE *f, ulong size)
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{
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if (size > f->dev->size)
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return -ENOSPC;
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return 0;
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}
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static DIR* devfs_opendir(struct device_d *dev, const char *pathname)
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{
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DIR *dir;
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dir = xzalloc(sizeof(DIR));
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if (!list_empty(&cdev_list))
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dir->priv = list_first_entry(&cdev_list, struct cdev, list);
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return dir;
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}
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static struct dirent* devfs_readdir(struct device_d *_dev, DIR *dir)
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{
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struct cdev *cdev = dir->priv;
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if (!cdev)
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return NULL;
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list_for_each_entry_from(cdev, &cdev_list, list) {
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strcpy(dir->d.d_name, cdev->name);
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dir->priv = list_entry(cdev->list.next, struct cdev, list);
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return &dir->d;
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}
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return NULL;
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}
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static int devfs_closedir(struct device_d *dev, DIR *dir)
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{
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free(dir);
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return 0;
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}
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static int devfs_stat(struct device_d *_dev, const char *filename, struct stat *s)
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{
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struct cdev *cdev;
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cdev = cdev_by_name(filename + 1);
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if (!cdev)
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return -ENOENT;
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s->st_mode = S_IFCHR;
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s->st_size = cdev->size;
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if (cdev->ops->write)
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s->st_mode |= S_IWUSR;
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if (cdev->ops->read)
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s->st_mode |= S_IRUSR;
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return 0;
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}
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static int devfs_probe(struct device_d *dev)
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{
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return 0;
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}
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static void devfs_delete(struct device_d *dev)
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{
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}
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static struct fs_driver_d devfs_driver = {
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.type = FS_TYPE_DEVFS,
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.read = devfs_read,
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.write = devfs_write,
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.lseek = devfs_lseek,
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.open = devfs_open,
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.close = devfs_close,
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.ioctl = devfs_ioctl,
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.opendir = devfs_opendir,
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.readdir = devfs_readdir,
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.truncate = devfs_truncate,
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.closedir = devfs_closedir,
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.stat = devfs_stat,
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.erase = devfs_erase,
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.protect = devfs_protect,
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.memmap = devfs_memmap,
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.flags = FS_DRIVER_NO_DEV,
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.drv = {
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.probe = devfs_probe,
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.remove = devfs_delete,
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.name = "devfs",
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.type_data = &devfs_driver,
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}
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};
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static int devfs_init(void)
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{
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return register_fs_driver(&devfs_driver);
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}
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coredevice_initcall(devfs_init);
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int devfs_create(struct cdev *new)
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{
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struct cdev *cdev;
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cdev = cdev_by_name(new->name);
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if (cdev)
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return -EEXIST;
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list_add_tail(&new->list, &cdev_list);
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if (new->dev)
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list_add_tail(&new->devices_list, &new->dev->cdevs);
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return 0;
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}
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int devfs_remove(struct cdev *cdev)
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{
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if (cdev->open)
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return -EBUSY;
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list_del(&cdev->list);
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if (cdev->dev)
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list_del(&cdev->devices_list);
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return 0;
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}
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int devfs_add_partition(const char *devname, unsigned long offset, size_t size,
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int flags, const char *name)
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{
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struct cdev *cdev, *new;
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cdev = cdev_by_name(name);
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if (cdev)
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return -EEXIST;
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cdev = cdev_by_name(devname);
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if (!cdev)
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return -ENOENT;
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if (offset + size > cdev->size)
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return -EINVAL;
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new = xzalloc(sizeof (*new));
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new->name = strdup(name);
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new->ops = cdev->ops;
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new->priv = cdev->priv;
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new->size = size;
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new->offset = offset + cdev->offset;
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new->dev = cdev->dev;
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new->flags = flags | DEVFS_IS_PARTITION;
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devfs_create(new);
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return 0;
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}
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int devfs_del_partition(const char *name)
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{
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struct cdev *cdev;
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int ret;
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cdev = cdev_by_name(name);
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if (!cdev)
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return -ENOENT;
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if (!(cdev->flags & DEVFS_IS_PARTITION))
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return -EINVAL;
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if (cdev->flags & DEVFS_PARTITION_FIXED)
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return -EPERM;
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ret = devfs_remove(cdev);
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if (ret)
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return ret;
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free(cdev->name);
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free(cdev);
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return 0;
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}
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