mirror of https://gitee.com/openkylin/linux.git
820 lines
18 KiB
C
820 lines
18 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2006
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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
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* 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
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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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* Author: Artem Bityutskiy (Битюцкий Артём)
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*/
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/*
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* This file includes implementation of UBI character device operations.
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*
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* There are two kinds of character devices in UBI: UBI character devices and
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* UBI volume character devices. UBI character devices allow users to
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* manipulate whole volumes: create, remove, and re-size them. Volume character
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* devices provide volume I/O capabilities.
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*
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* Major and minor numbers are assigned dynamically to both UBI and volume
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* character devices.
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*
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* Well, there is the third kind of character devices - the UBI control
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* character device, which allows to manipulate by UBI devices - create and
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* delete them. In other words, it is used for attaching and detaching MTD
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* devices.
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*/
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#include <linux/module.h>
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#include <linux/stat.h>
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#include <linux/ioctl.h>
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#include <linux/capability.h>
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#include <mtd/ubi-user.h>
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#include <asm/uaccess.h>
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#include <asm/div64.h>
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#include "ubi.h"
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/**
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* get_exclusive - get exclusive access to an UBI volume.
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* @desc: volume descriptor
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*
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* This function changes UBI volume open mode to "exclusive". Returns previous
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* mode value (positive integer) in case of success and a negative error code
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* in case of failure.
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*/
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static int get_exclusive(struct ubi_volume_desc *desc)
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{
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int users, err;
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struct ubi_volume *vol = desc->vol;
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spin_lock(&vol->ubi->volumes_lock);
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users = vol->readers + vol->writers + vol->exclusive;
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ubi_assert(users > 0);
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if (users > 1) {
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dbg_err("%d users for volume %d", users, vol->vol_id);
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err = -EBUSY;
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} else {
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vol->readers = vol->writers = 0;
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vol->exclusive = 1;
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err = desc->mode;
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desc->mode = UBI_EXCLUSIVE;
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}
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spin_unlock(&vol->ubi->volumes_lock);
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return err;
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}
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/**
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* revoke_exclusive - revoke exclusive mode.
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* @desc: volume descriptor
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* @mode: new mode to switch to
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*/
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static void revoke_exclusive(struct ubi_volume_desc *desc, int mode)
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{
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struct ubi_volume *vol = desc->vol;
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spin_lock(&vol->ubi->volumes_lock);
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ubi_assert(vol->readers == 0 && vol->writers == 0);
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ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE);
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vol->exclusive = 0;
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if (mode == UBI_READONLY)
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vol->readers = 1;
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else if (mode == UBI_READWRITE)
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vol->writers = 1;
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else
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vol->exclusive = 1;
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spin_unlock(&vol->ubi->volumes_lock);
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desc->mode = mode;
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}
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static int vol_cdev_open(struct inode *inode, struct file *file)
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{
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struct ubi_volume_desc *desc;
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int vol_id = iminor(inode) - 1, mode, ubi_num;
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ubi_num = ubi_major2num(imajor(inode));
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if (ubi_num < 0)
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return ubi_num;
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if (file->f_mode & FMODE_WRITE)
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mode = UBI_READWRITE;
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else
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mode = UBI_READONLY;
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dbg_msg("open volume %d, mode %d", vol_id, mode);
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desc = ubi_open_volume(ubi_num, vol_id, mode);
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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file->private_data = desc;
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return 0;
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}
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static int vol_cdev_release(struct inode *inode, struct file *file)
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{
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struct ubi_volume_desc *desc = file->private_data;
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struct ubi_volume *vol = desc->vol;
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dbg_msg("release volume %d, mode %d", vol->vol_id, desc->mode);
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if (vol->updating) {
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ubi_warn("update of volume %d not finished, volume is damaged",
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vol->vol_id);
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ubi_assert(!vol->changing_leb);
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vol->updating = 0;
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vfree(vol->upd_buf);
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} else if (vol->changing_leb) {
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dbg_msg("only %lld of %lld bytes received for atomic LEB change"
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" for volume %d:%d, cancel", vol->upd_received,
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vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id);
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vol->changing_leb = 0;
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vfree(vol->upd_buf);
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}
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ubi_close_volume(desc);
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return 0;
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}
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static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
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{
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struct ubi_volume_desc *desc = file->private_data;
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struct ubi_volume *vol = desc->vol;
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loff_t new_offset;
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if (vol->updating) {
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/* Update is in progress, seeking is prohibited */
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dbg_err("updating");
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return -EBUSY;
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}
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switch (origin) {
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case 0: /* SEEK_SET */
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new_offset = offset;
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break;
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case 1: /* SEEK_CUR */
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new_offset = file->f_pos + offset;
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break;
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case 2: /* SEEK_END */
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new_offset = vol->used_bytes + offset;
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break;
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default:
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return -EINVAL;
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}
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if (new_offset < 0 || new_offset > vol->used_bytes) {
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dbg_err("bad seek %lld", new_offset);
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return -EINVAL;
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}
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dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld",
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vol->vol_id, offset, origin, new_offset);
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file->f_pos = new_offset;
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return new_offset;
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}
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static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
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loff_t *offp)
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{
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struct ubi_volume_desc *desc = file->private_data;
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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int err, lnum, off, len, tbuf_size;
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size_t count_save = count;
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void *tbuf;
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uint64_t tmp;
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dbg_msg("read %zd bytes from offset %lld of volume %d",
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count, *offp, vol->vol_id);
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if (vol->updating) {
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dbg_err("updating");
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return -EBUSY;
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}
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if (vol->upd_marker) {
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dbg_err("damaged volume, update marker is set");
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return -EBADF;
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}
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if (*offp == vol->used_bytes || count == 0)
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return 0;
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if (vol->corrupted)
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dbg_msg("read from corrupted volume %d", vol->vol_id);
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if (*offp + count > vol->used_bytes)
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count_save = count = vol->used_bytes - *offp;
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tbuf_size = vol->usable_leb_size;
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if (count < tbuf_size)
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tbuf_size = ALIGN(count, ubi->min_io_size);
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tbuf = vmalloc(tbuf_size);
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if (!tbuf)
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return -ENOMEM;
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len = count > tbuf_size ? tbuf_size : count;
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tmp = *offp;
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off = do_div(tmp, vol->usable_leb_size);
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lnum = tmp;
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do {
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cond_resched();
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if (off + len >= vol->usable_leb_size)
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len = vol->usable_leb_size - off;
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err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
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if (err)
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break;
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off += len;
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if (off == vol->usable_leb_size) {
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lnum += 1;
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off -= vol->usable_leb_size;
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}
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count -= len;
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*offp += len;
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err = copy_to_user(buf, tbuf, len);
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if (err) {
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err = -EFAULT;
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break;
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}
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buf += len;
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len = count > tbuf_size ? tbuf_size : count;
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} while (count);
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vfree(tbuf);
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return err ? err : count_save - count;
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}
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#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
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/*
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* This function allows to directly write to dynamic UBI volumes, without
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* issuing the volume update operation. Available only as a debugging feature.
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* Very useful for testing UBI.
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*/
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static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offp)
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{
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struct ubi_volume_desc *desc = file->private_data;
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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int lnum, off, len, tbuf_size, err = 0;
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size_t count_save = count;
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char *tbuf;
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uint64_t tmp;
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dbg_msg("requested: write %zd bytes to offset %lld of volume %u",
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count, *offp, vol->vol_id);
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if (vol->vol_type == UBI_STATIC_VOLUME)
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return -EROFS;
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tmp = *offp;
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off = do_div(tmp, vol->usable_leb_size);
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lnum = tmp;
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if (off % ubi->min_io_size) {
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dbg_err("unaligned position");
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return -EINVAL;
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}
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if (*offp + count > vol->used_bytes)
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count_save = count = vol->used_bytes - *offp;
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/* We can write only in fractions of the minimum I/O unit */
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if (count % ubi->min_io_size) {
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dbg_err("unaligned write length");
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return -EINVAL;
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}
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tbuf_size = vol->usable_leb_size;
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if (count < tbuf_size)
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tbuf_size = ALIGN(count, ubi->min_io_size);
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tbuf = vmalloc(tbuf_size);
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if (!tbuf)
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return -ENOMEM;
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len = count > tbuf_size ? tbuf_size : count;
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while (count) {
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cond_resched();
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if (off + len >= vol->usable_leb_size)
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len = vol->usable_leb_size - off;
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err = copy_from_user(tbuf, buf, len);
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if (err) {
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err = -EFAULT;
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break;
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}
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err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len,
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UBI_UNKNOWN);
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if (err)
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break;
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off += len;
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if (off == vol->usable_leb_size) {
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lnum += 1;
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off -= vol->usable_leb_size;
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}
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count -= len;
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*offp += len;
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buf += len;
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len = count > tbuf_size ? tbuf_size : count;
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}
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vfree(tbuf);
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return err ? err : count_save - count;
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}
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#else
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#define vol_cdev_direct_write(file, buf, count, offp) -EPERM
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#endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */
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static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offp)
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{
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int err = 0;
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struct ubi_volume_desc *desc = file->private_data;
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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if (!vol->updating && !vol->changing_leb)
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return vol_cdev_direct_write(file, buf, count, offp);
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if (vol->updating)
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err = ubi_more_update_data(ubi, vol, buf, count);
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else
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err = ubi_more_leb_change_data(ubi, vol, buf, count);
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if (err < 0) {
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ubi_err("cannot accept more %zd bytes of data, error %d",
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count, err);
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return err;
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}
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if (err) {
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/*
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* The operation is finished, @err contains number of actually
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* written bytes.
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*/
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count = err;
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if (vol->changing_leb) {
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revoke_exclusive(desc, UBI_READWRITE);
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return count;
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}
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err = ubi_check_volume(ubi, vol->vol_id);
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if (err < 0)
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return err;
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if (err) {
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ubi_warn("volume %d on UBI device %d is corrupted",
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vol->vol_id, ubi->ubi_num);
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vol->corrupted = 1;
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}
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vol->checked = 1;
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ubi_gluebi_updated(vol);
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revoke_exclusive(desc, UBI_READWRITE);
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}
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return count;
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}
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static int vol_cdev_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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int err = 0;
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struct ubi_volume_desc *desc = file->private_data;
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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void __user *argp = (void __user *)arg;
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switch (cmd) {
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/* Volume update command */
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case UBI_IOCVOLUP:
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{
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int64_t bytes, rsvd_bytes;
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if (!capable(CAP_SYS_RESOURCE)) {
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err = -EPERM;
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break;
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}
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err = copy_from_user(&bytes, argp, sizeof(int64_t));
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if (err) {
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err = -EFAULT;
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break;
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}
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if (desc->mode == UBI_READONLY) {
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err = -EROFS;
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break;
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}
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rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad);
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if (bytes < 0 || bytes > rsvd_bytes) {
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err = -EINVAL;
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break;
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}
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err = get_exclusive(desc);
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if (err < 0)
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break;
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err = ubi_start_update(ubi, vol, bytes);
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if (bytes == 0)
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revoke_exclusive(desc, UBI_READWRITE);
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break;
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}
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/* Atomic logical eraseblock change command */
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case UBI_IOCEBCH:
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{
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struct ubi_leb_change_req req;
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err = copy_from_user(&req, argp,
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sizeof(struct ubi_leb_change_req));
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if (err) {
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err = -EFAULT;
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break;
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}
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if (desc->mode == UBI_READONLY ||
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vol->vol_type == UBI_STATIC_VOLUME) {
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err = -EROFS;
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break;
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}
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/* Validate the request */
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err = -EINVAL;
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if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
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req.bytes < 0 || req.lnum >= vol->usable_leb_size)
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break;
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if (req.dtype != UBI_LONGTERM && req.dtype != UBI_SHORTTERM &&
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req.dtype != UBI_UNKNOWN)
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break;
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err = get_exclusive(desc);
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if (err < 0)
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break;
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err = ubi_start_leb_change(ubi, vol, &req);
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if (req.bytes == 0)
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revoke_exclusive(desc, UBI_READWRITE);
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break;
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}
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#ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
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/* Logical eraseblock erasure command */
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case UBI_IOCEBER:
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{
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int32_t lnum;
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err = get_user(lnum, (__user int32_t *)argp);
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if (err) {
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err = -EFAULT;
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break;
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}
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if (desc->mode == UBI_READONLY ||
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vol->vol_type == UBI_STATIC_VOLUME) {
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err = -EROFS;
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break;
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}
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if (lnum < 0 || lnum >= vol->reserved_pebs) {
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err = -EINVAL;
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break;
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}
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dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
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err = ubi_eba_unmap_leb(ubi, vol, lnum);
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if (err)
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break;
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err = ubi_wl_flush(ubi);
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break;
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}
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#endif
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default:
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err = -ENOTTY;
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break;
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}
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return err;
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}
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/**
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* verify_mkvol_req - verify volume creation request.
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* @ubi: UBI device description object
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* @req: the request to check
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*
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* This function zero if the request is correct, and %-EINVAL if not.
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*/
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static int verify_mkvol_req(const struct ubi_device *ubi,
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const struct ubi_mkvol_req *req)
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{
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int n, err = -EINVAL;
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|
if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
|
|
req->name_len < 0)
|
|
goto bad;
|
|
|
|
if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
|
|
req->vol_id != UBI_VOL_NUM_AUTO)
|
|
goto bad;
|
|
|
|
if (req->alignment == 0)
|
|
goto bad;
|
|
|
|
if (req->bytes == 0)
|
|
goto bad;
|
|
|
|
if (req->vol_type != UBI_DYNAMIC_VOLUME &&
|
|
req->vol_type != UBI_STATIC_VOLUME)
|
|
goto bad;
|
|
|
|
if (req->alignment > ubi->leb_size)
|
|
goto bad;
|
|
|
|
n = req->alignment % ubi->min_io_size;
|
|
if (req->alignment != 1 && n)
|
|
goto bad;
|
|
|
|
if (req->name_len > UBI_VOL_NAME_MAX) {
|
|
err = -ENAMETOOLONG;
|
|
goto bad;
|
|
}
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
dbg_err("bad volume creation request");
|
|
ubi_dbg_dump_mkvol_req(req);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* verify_rsvol_req - verify volume re-size request.
|
|
* @ubi: UBI device description object
|
|
* @req: the request to check
|
|
*
|
|
* This function returns zero if the request is correct, and %-EINVAL if not.
|
|
*/
|
|
static int verify_rsvol_req(const struct ubi_device *ubi,
|
|
const struct ubi_rsvol_req *req)
|
|
{
|
|
if (req->bytes <= 0)
|
|
return -EINVAL;
|
|
|
|
if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
struct ubi_device *ubi;
|
|
struct ubi_volume_desc *desc;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
|
|
ubi = ubi_get_by_major(imajor(inode));
|
|
if (!ubi)
|
|
return -ENODEV;
|
|
|
|
switch (cmd) {
|
|
/* Create volume command */
|
|
case UBI_IOCMKVOL:
|
|
{
|
|
struct ubi_mkvol_req req;
|
|
|
|
dbg_msg("create volume");
|
|
err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
|
|
if (err) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
err = verify_mkvol_req(ubi, &req);
|
|
if (err)
|
|
break;
|
|
|
|
req.name[req.name_len] = '\0';
|
|
|
|
mutex_lock(&ubi->volumes_mutex);
|
|
err = ubi_create_volume(ubi, &req);
|
|
mutex_unlock(&ubi->volumes_mutex);
|
|
if (err)
|
|
break;
|
|
|
|
err = put_user(req.vol_id, (__user int32_t *)argp);
|
|
if (err)
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
/* Remove volume command */
|
|
case UBI_IOCRMVOL:
|
|
{
|
|
int vol_id;
|
|
|
|
dbg_msg("remove volume");
|
|
err = get_user(vol_id, (__user int32_t *)argp);
|
|
if (err) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
|
|
if (IS_ERR(desc)) {
|
|
err = PTR_ERR(desc);
|
|
break;
|
|
}
|
|
|
|
mutex_lock(&ubi->volumes_mutex);
|
|
err = ubi_remove_volume(desc);
|
|
mutex_unlock(&ubi->volumes_mutex);
|
|
|
|
/*
|
|
* The volume is deleted (unless an error occurred), and the
|
|
* 'struct ubi_volume' object will be freed when
|
|
* 'ubi_close_volume()' will call 'put_device()'.
|
|
*/
|
|
ubi_close_volume(desc);
|
|
break;
|
|
}
|
|
|
|
/* Re-size volume command */
|
|
case UBI_IOCRSVOL:
|
|
{
|
|
int pebs;
|
|
uint64_t tmp;
|
|
struct ubi_rsvol_req req;
|
|
|
|
dbg_msg("re-size volume");
|
|
err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
|
|
if (err) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
err = verify_rsvol_req(ubi, &req);
|
|
if (err)
|
|
break;
|
|
|
|
desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
|
|
if (IS_ERR(desc)) {
|
|
err = PTR_ERR(desc);
|
|
break;
|
|
}
|
|
|
|
tmp = req.bytes;
|
|
pebs = !!do_div(tmp, desc->vol->usable_leb_size);
|
|
pebs += tmp;
|
|
|
|
mutex_lock(&ubi->volumes_mutex);
|
|
err = ubi_resize_volume(desc, pebs);
|
|
mutex_unlock(&ubi->volumes_mutex);
|
|
ubi_close_volume(desc);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
err = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
ubi_put_device(ubi);
|
|
return err;
|
|
}
|
|
|
|
static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
/* Attach an MTD device command */
|
|
case UBI_IOCATT:
|
|
{
|
|
struct ubi_attach_req req;
|
|
struct mtd_info *mtd;
|
|
|
|
dbg_msg("attach MTD device");
|
|
err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
|
|
if (err) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (req.mtd_num < 0 ||
|
|
(req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
mtd = get_mtd_device(NULL, req.mtd_num);
|
|
if (IS_ERR(mtd)) {
|
|
err = PTR_ERR(mtd);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Note, further request verification is done by
|
|
* 'ubi_attach_mtd_dev()'.
|
|
*/
|
|
mutex_lock(&ubi_devices_mutex);
|
|
err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
|
|
mutex_unlock(&ubi_devices_mutex);
|
|
if (err < 0)
|
|
put_mtd_device(mtd);
|
|
else
|
|
/* @err contains UBI device number */
|
|
err = put_user(err, (__user int32_t *)argp);
|
|
|
|
break;
|
|
}
|
|
|
|
/* Detach an MTD device command */
|
|
case UBI_IOCDET:
|
|
{
|
|
int ubi_num;
|
|
|
|
dbg_msg("dettach MTD device");
|
|
err = get_user(ubi_num, (__user int32_t *)argp);
|
|
if (err) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
mutex_lock(&ubi_devices_mutex);
|
|
err = ubi_detach_mtd_dev(ubi_num, 0);
|
|
mutex_unlock(&ubi_devices_mutex);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
err = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/* UBI control character device operations */
|
|
struct file_operations ubi_ctrl_cdev_operations = {
|
|
.ioctl = ctrl_cdev_ioctl,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/* UBI character device operations */
|
|
struct file_operations ubi_cdev_operations = {
|
|
.owner = THIS_MODULE,
|
|
.ioctl = ubi_cdev_ioctl,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
/* UBI volume character device operations */
|
|
struct file_operations ubi_vol_cdev_operations = {
|
|
.owner = THIS_MODULE,
|
|
.open = vol_cdev_open,
|
|
.release = vol_cdev_release,
|
|
.llseek = vol_cdev_llseek,
|
|
.read = vol_cdev_read,
|
|
.write = vol_cdev_write,
|
|
.ioctl = vol_cdev_ioctl,
|
|
};
|