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1108 lines
24 KiB
1108 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) International Business Machines Corp., 2006 |
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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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/* |
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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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|
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#include <linux/module.h> |
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#include <linux/stat.h> |
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#include <linux/slab.h> |
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#include <linux/ioctl.h> |
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#include <linux/capability.h> |
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#include <linux/uaccess.h> |
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#include <linux/compat.h> |
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#include <linux/math64.h> |
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#include <mtd/ubi-user.h> |
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#include "ubi.h" |
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|
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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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|
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spin_lock(&vol->ubi->volumes_lock); |
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users = vol->readers + vol->writers + vol->exclusive + vol->metaonly; |
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ubi_assert(users > 0); |
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if (users > 1) { |
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ubi_err(vol->ubi, "%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 = vol->metaonly = 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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|
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return err; |
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} |
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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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|
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spin_lock(&vol->ubi->volumes_lock); |
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ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 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 if (mode == UBI_METAONLY) |
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vol->metaonly = 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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|
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desc->mode = mode; |
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} |
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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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|
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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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|
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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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|
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dbg_gen("open device %d, volume %d, mode %d", |
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ubi_num, vol_id, mode); |
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|
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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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|
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file->private_data = desc; |
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return 0; |
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} |
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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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|
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dbg_gen("release device %d, volume %d, mode %d", |
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vol->ubi->ubi_num, vol->vol_id, desc->mode); |
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|
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if (vol->updating) { |
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ubi_warn(vol->ubi, "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_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", |
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vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, |
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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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|
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ubi_close_volume(desc); |
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return 0; |
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} |
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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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|
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if (vol->updating) { |
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/* Update is in progress, seeking is prohibited */ |
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ubi_err(vol->ubi, "updating"); |
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return -EBUSY; |
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} |
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|
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return fixed_size_llseek(file, offset, origin, vol->used_bytes); |
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} |
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|
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static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, |
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int datasync) |
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{ |
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struct ubi_volume_desc *desc = file->private_data; |
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struct ubi_device *ubi = desc->vol->ubi; |
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struct inode *inode = file_inode(file); |
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int err; |
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inode_lock(inode); |
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err = ubi_sync(ubi->ubi_num); |
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inode_unlock(inode); |
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return err; |
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} |
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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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|
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dbg_gen("read %zd bytes from offset %lld of volume %d", |
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count, *offp, vol->vol_id); |
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|
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if (vol->updating) { |
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ubi_err(vol->ubi, "updating"); |
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return -EBUSY; |
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} |
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if (vol->upd_marker) { |
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ubi_err(vol->ubi, "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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|
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if (vol->corrupted) |
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dbg_gen("read from corrupted volume %d", vol->vol_id); |
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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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|
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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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|
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len = count > tbuf_size ? tbuf_size : count; |
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lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
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|
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do { |
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cond_resched(); |
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|
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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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|
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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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|
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count -= len; |
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*offp += len; |
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|
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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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|
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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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|
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vfree(tbuf); |
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return err ? err : count_save - count; |
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} |
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|
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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. |
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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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|
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if (!vol->direct_writes) |
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return -EPERM; |
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|
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dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
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count, *offp, vol->vol_id); |
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|
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if (vol->vol_type == UBI_STATIC_VOLUME) |
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return -EROFS; |
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|
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lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
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if (off & (ubi->min_io_size - 1)) { |
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ubi_err(ubi, "unaligned position"); |
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return -EINVAL; |
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} |
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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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|
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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 - 1)) { |
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ubi_err(ubi, "unaligned write length"); |
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return -EINVAL; |
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} |
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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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|
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len = count > tbuf_size ? tbuf_size : count; |
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|
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while (count) { |
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cond_resched(); |
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|
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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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|
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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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if (err) |
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break; |
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|
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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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|
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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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|
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vfree(tbuf); |
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return err ? err : count_save - count; |
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} |
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|
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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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|
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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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|
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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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|
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if (err < 0) { |
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ubi_err(ubi, "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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|
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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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|
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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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|
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/* |
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* We voluntarily do not take into account the skip_check flag |
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* as we want to make sure what we wrote was correctly written. |
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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(ubi, "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_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
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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 long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
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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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|
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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 = (long long)vol->reserved_pebs * |
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vol->usable_leb_size; |
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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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ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
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revoke_exclusive(desc, UBI_READWRITE); |
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} |
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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 */ |
|
err = -EINVAL; |
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if (!ubi_leb_valid(vol, req.lnum) || |
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req.bytes < 0 || req.bytes > vol->usable_leb_size) |
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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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/* Logical eraseblock erasure command */ |
|
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); |
|
if (err) { |
|
err = -EFAULT; |
|
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; |
|
break; |
|
} |
|
|
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if (!ubi_leb_valid(vol, lnum)) { |
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err = -EINVAL; |
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break; |
|
} |
|
|
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dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
|
err = ubi_eba_unmap_leb(ubi, vol, lnum); |
|
if (err) |
|
break; |
|
|
|
err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); |
|
break; |
|
} |
|
|
|
/* Logical eraseblock map command */ |
|
case UBI_IOCEBMAP: |
|
{ |
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struct ubi_map_req req; |
|
|
|
err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); |
|
if (err) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
err = ubi_leb_map(desc, req.lnum); |
|
break; |
|
} |
|
|
|
/* Logical eraseblock un-map command */ |
|
case UBI_IOCEBUNMAP: |
|
{ |
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int32_t lnum; |
|
|
|
err = get_user(lnum, (__user int32_t *)argp); |
|
if (err) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
err = ubi_leb_unmap(desc, lnum); |
|
break; |
|
} |
|
|
|
/* Check if logical eraseblock is mapped command */ |
|
case UBI_IOCEBISMAP: |
|
{ |
|
int32_t lnum; |
|
|
|
err = get_user(lnum, (__user int32_t *)argp); |
|
if (err) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
err = ubi_is_mapped(desc, lnum); |
|
break; |
|
} |
|
|
|
/* Set volume property command */ |
|
case UBI_IOCSETVOLPROP: |
|
{ |
|
struct ubi_set_vol_prop_req req; |
|
|
|
err = copy_from_user(&req, argp, |
|
sizeof(struct ubi_set_vol_prop_req)); |
|
if (err) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
switch (req.property) { |
|
case UBI_VOL_PROP_DIRECT_WRITE: |
|
mutex_lock(&ubi->device_mutex); |
|
desc->vol->direct_writes = !!req.value; |
|
mutex_unlock(&ubi->device_mutex); |
|
break; |
|
default: |
|
err = -EINVAL; |
|
break; |
|
} |
|
break; |
|
} |
|
|
|
/* Create a R/O block device on top of the UBI volume */ |
|
case UBI_IOCVOLCRBLK: |
|
{ |
|
struct ubi_volume_info vi; |
|
|
|
ubi_get_volume_info(desc, &vi); |
|
err = ubiblock_create(&vi); |
|
break; |
|
} |
|
|
|
/* Remove the R/O block device */ |
|
case UBI_IOCVOLRMBLK: |
|
{ |
|
struct ubi_volume_info vi; |
|
|
|
ubi_get_volume_info(desc, &vi); |
|
err = ubiblock_remove(&vi); |
|
break; |
|
} |
|
|
|
default: |
|
err = -ENOTTY; |
|
break; |
|
} |
|
return err; |
|
} |
|
|
|
/** |
|
* verify_mkvol_req - verify volume creation request. |
|
* @ubi: UBI device description object |
|
* @req: the request to check |
|
* |
|
* This function zero if the request is correct, and %-EINVAL if not. |
|
*/ |
|
static int verify_mkvol_req(const struct ubi_device *ubi, |
|
const struct ubi_mkvol_req *req) |
|
{ |
|
int n, err = -EINVAL; |
|
|
|
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->flags & ~UBI_VOL_VALID_FLGS) |
|
goto bad; |
|
|
|
if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG && |
|
req->vol_type != UBI_STATIC_VOLUME) |
|
goto bad; |
|
|
|
if (req->alignment > ubi->leb_size) |
|
goto bad; |
|
|
|
n = req->alignment & (ubi->min_io_size - 1); |
|
if (req->alignment != 1 && n) |
|
goto bad; |
|
|
|
if (!req->name[0] || !req->name_len) |
|
goto bad; |
|
|
|
if (req->name_len > UBI_VOL_NAME_MAX) { |
|
err = -ENAMETOOLONG; |
|
goto bad; |
|
} |
|
|
|
n = strnlen(req->name, req->name_len + 1); |
|
if (n != req->name_len) |
|
goto bad; |
|
|
|
return 0; |
|
|
|
bad: |
|
ubi_err(ubi, "bad volume creation request"); |
|
ubi_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; |
|
} |
|
|
|
/** |
|
* rename_volumes - rename UBI volumes. |
|
* @ubi: UBI device description object |
|
* @req: volumes re-name request |
|
* |
|
* This is a helper function for the volume re-name IOCTL which validates the |
|
* the request, opens the volume and calls corresponding volumes management |
|
* function. Returns zero in case of success and a negative error code in case |
|
* of failure. |
|
*/ |
|
static int rename_volumes(struct ubi_device *ubi, |
|
struct ubi_rnvol_req *req) |
|
{ |
|
int i, n, err; |
|
struct list_head rename_list; |
|
struct ubi_rename_entry *re, *re1; |
|
|
|
if (req->count < 0 || req->count > UBI_MAX_RNVOL) |
|
return -EINVAL; |
|
|
|
if (req->count == 0) |
|
return 0; |
|
|
|
/* Validate volume IDs and names in the request */ |
|
for (i = 0; i < req->count; i++) { |
|
if (req->ents[i].vol_id < 0 || |
|
req->ents[i].vol_id >= ubi->vtbl_slots) |
|
return -EINVAL; |
|
if (req->ents[i].name_len < 0) |
|
return -EINVAL; |
|
if (req->ents[i].name_len > UBI_VOL_NAME_MAX) |
|
return -ENAMETOOLONG; |
|
req->ents[i].name[req->ents[i].name_len] = '\0'; |
|
n = strlen(req->ents[i].name); |
|
if (n != req->ents[i].name_len) |
|
return -EINVAL; |
|
} |
|
|
|
/* Make sure volume IDs and names are unique */ |
|
for (i = 0; i < req->count - 1; i++) { |
|
for (n = i + 1; n < req->count; n++) { |
|
if (req->ents[i].vol_id == req->ents[n].vol_id) { |
|
ubi_err(ubi, "duplicated volume id %d", |
|
req->ents[i].vol_id); |
|
return -EINVAL; |
|
} |
|
if (!strcmp(req->ents[i].name, req->ents[n].name)) { |
|
ubi_err(ubi, "duplicated volume name \"%s\"", |
|
req->ents[i].name); |
|
return -EINVAL; |
|
} |
|
} |
|
} |
|
|
|
/* Create the re-name list */ |
|
INIT_LIST_HEAD(&rename_list); |
|
for (i = 0; i < req->count; i++) { |
|
int vol_id = req->ents[i].vol_id; |
|
int name_len = req->ents[i].name_len; |
|
const char *name = req->ents[i].name; |
|
|
|
re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
|
if (!re) { |
|
err = -ENOMEM; |
|
goto out_free; |
|
} |
|
|
|
re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY); |
|
if (IS_ERR(re->desc)) { |
|
err = PTR_ERR(re->desc); |
|
ubi_err(ubi, "cannot open volume %d, error %d", |
|
vol_id, err); |
|
kfree(re); |
|
goto out_free; |
|
} |
|
|
|
/* Skip this re-naming if the name does not really change */ |
|
if (re->desc->vol->name_len == name_len && |
|
!memcmp(re->desc->vol->name, name, name_len)) { |
|
ubi_close_volume(re->desc); |
|
kfree(re); |
|
continue; |
|
} |
|
|
|
re->new_name_len = name_len; |
|
memcpy(re->new_name, name, name_len); |
|
list_add_tail(&re->list, &rename_list); |
|
dbg_gen("will rename volume %d from \"%s\" to \"%s\"", |
|
vol_id, re->desc->vol->name, name); |
|
} |
|
|
|
if (list_empty(&rename_list)) |
|
return 0; |
|
|
|
/* Find out the volumes which have to be removed */ |
|
list_for_each_entry(re, &rename_list, list) { |
|
struct ubi_volume_desc *desc; |
|
int no_remove_needed = 0; |
|
|
|
/* |
|
* Volume @re->vol_id is going to be re-named to |
|
* @re->new_name, while its current name is @name. If a volume |
|
* with name @re->new_name currently exists, it has to be |
|
* removed, unless it is also re-named in the request (@req). |
|
*/ |
|
list_for_each_entry(re1, &rename_list, list) { |
|
if (re->new_name_len == re1->desc->vol->name_len && |
|
!memcmp(re->new_name, re1->desc->vol->name, |
|
re1->desc->vol->name_len)) { |
|
no_remove_needed = 1; |
|
break; |
|
} |
|
} |
|
|
|
if (no_remove_needed) |
|
continue; |
|
|
|
/* |
|
* It seems we need to remove volume with name @re->new_name, |
|
* if it exists. |
|
*/ |
|
desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
|
UBI_EXCLUSIVE); |
|
if (IS_ERR(desc)) { |
|
err = PTR_ERR(desc); |
|
if (err == -ENODEV) |
|
/* Re-naming into a non-existing volume name */ |
|
continue; |
|
|
|
/* The volume exists but busy, or an error occurred */ |
|
ubi_err(ubi, "cannot open volume \"%s\", error %d", |
|
re->new_name, err); |
|
goto out_free; |
|
} |
|
|
|
re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
|
if (!re1) { |
|
err = -ENOMEM; |
|
ubi_close_volume(desc); |
|
goto out_free; |
|
} |
|
|
|
re1->remove = 1; |
|
re1->desc = desc; |
|
list_add(&re1->list, &rename_list); |
|
dbg_gen("will remove volume %d, name \"%s\"", |
|
re1->desc->vol->vol_id, re1->desc->vol->name); |
|
} |
|
|
|
mutex_lock(&ubi->device_mutex); |
|
err = ubi_rename_volumes(ubi, &rename_list); |
|
mutex_unlock(&ubi->device_mutex); |
|
|
|
out_free: |
|
list_for_each_entry_safe(re, re1, &rename_list, list) { |
|
ubi_close_volume(re->desc); |
|
list_del(&re->list); |
|
kfree(re); |
|
} |
|
return err; |
|
} |
|
|
|
static long ubi_cdev_ioctl(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(file->f_mapping->host)); |
|
if (!ubi) |
|
return -ENODEV; |
|
|
|
switch (cmd) { |
|
/* Create volume command */ |
|
case UBI_IOCMKVOL: |
|
{ |
|
struct ubi_mkvol_req req; |
|
|
|
dbg_gen("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; |
|
|
|
mutex_lock(&ubi->device_mutex); |
|
err = ubi_create_volume(ubi, &req); |
|
mutex_unlock(&ubi->device_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_gen("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->device_mutex); |
|
err = ubi_remove_volume(desc, 0); |
|
mutex_unlock(&ubi->device_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; |
|
struct ubi_rsvol_req req; |
|
|
|
dbg_gen("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; |
|
} |
|
|
|
pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
|
desc->vol->usable_leb_size); |
|
|
|
mutex_lock(&ubi->device_mutex); |
|
err = ubi_resize_volume(desc, pebs); |
|
mutex_unlock(&ubi->device_mutex); |
|
ubi_close_volume(desc); |
|
break; |
|
} |
|
|
|
/* Re-name volumes command */ |
|
case UBI_IOCRNVOL: |
|
{ |
|
struct ubi_rnvol_req *req; |
|
|
|
dbg_gen("re-name volumes"); |
|
req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); |
|
if (!req) { |
|
err = -ENOMEM; |
|
break; |
|
} |
|
|
|
err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); |
|
if (err) { |
|
err = -EFAULT; |
|
kfree(req); |
|
break; |
|
} |
|
|
|
err = rename_volumes(ubi, req); |
|
kfree(req); |
|
break; |
|
} |
|
|
|
/* Check a specific PEB for bitflips and scrub it if needed */ |
|
case UBI_IOCRPEB: |
|
{ |
|
int pnum; |
|
|
|
err = get_user(pnum, (__user int32_t *)argp); |
|
if (err) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
|
|
err = ubi_bitflip_check(ubi, pnum, 0); |
|
break; |
|
} |
|
|
|
/* Force scrubbing for a specific PEB */ |
|
case UBI_IOCSPEB: |
|
{ |
|
int pnum; |
|
|
|
err = get_user(pnum, (__user int32_t *)argp); |
|
if (err) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
|
|
err = ubi_bitflip_check(ubi, pnum, 1); |
|
break; |
|
} |
|
|
|
default: |
|
err = -ENOTTY; |
|
break; |
|
} |
|
|
|
ubi_put_device(ubi); |
|
return err; |
|
} |
|
|
|
static long ctrl_cdev_ioctl(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_gen("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, |
|
req.max_beb_per1024); |
|
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_gen("detach 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 volume character device operations */ |
|
const 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, |
|
.fsync = vol_cdev_fsync, |
|
.unlocked_ioctl = vol_cdev_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
}; |
|
|
|
/* UBI character device operations */ |
|
const struct file_operations ubi_cdev_operations = { |
|
.owner = THIS_MODULE, |
|
.llseek = no_llseek, |
|
.unlocked_ioctl = ubi_cdev_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
}; |
|
|
|
/* UBI control character device operations */ |
|
const struct file_operations ubi_ctrl_cdev_operations = { |
|
.owner = THIS_MODULE, |
|
.unlocked_ioctl = ctrl_cdev_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.llseek = no_llseek, |
|
};
|
|
|