154 lines
4.5 KiB
C
Executable File
154 lines
4.5 KiB
C
Executable File
/*
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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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/* Here we keep miscellaneous functions which are used all over the UBI code */
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#include "ubi.h"
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/**
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* calc_data_len - calculate how much real data is stored in a buffer.
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* @ubi: UBI device description object
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* @buf: a buffer with the contents of the physical eraseblock
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* @length: the buffer length
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*
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* This function calculates how much "real data" is stored in @buf and returnes
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* the length. Continuous 0xFF bytes at the end of the buffer are not
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* considered as "real data".
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*/
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int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
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int length)
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{
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int i;
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ubi_assert(!(length & (ubi->min_io_size - 1)));
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for (i = length - 1; i >= 0; i--)
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if (((const uint8_t *)buf)[i] != 0xFF)
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break;
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/* The resulting length must be aligned to the minimum flash I/O size */
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length = ALIGN(i + 1, ubi->min_io_size);
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return length;
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}
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/**
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* ubi_check_volume - check the contents of a static volume.
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* @ubi: UBI device description object
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* @vol_id: ID of the volume to check
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*
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* This function checks if static volume @vol_id is corrupted by fully reading
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* it and checking data CRC. This function returns %0 if the volume is not
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* corrupted, %1 if it is corrupted and a negative error code in case of
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* failure. Dynamic volumes are not checked and zero is returned immediately.
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*/
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int ubi_check_volume(struct ubi_device *ubi, int vol_id)
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{
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void *buf;
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int err = 0, i;
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struct ubi_volume *vol = ubi->volumes[vol_id];
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if (vol->vol_type != UBI_STATIC_VOLUME)
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return 0;
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buf = vmalloc(vol->usable_leb_size);
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if (!buf)
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return -ENOMEM;
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for (i = 0; i < vol->used_ebs; i++) {
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int size;
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if (i == vol->used_ebs - 1)
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size = vol->last_eb_bytes;
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else
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size = vol->usable_leb_size;
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err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1);
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if (err) {
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if (mtd_is_eccerr(err))
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err = 1;
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break;
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}
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}
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vfree(buf);
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return err;
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}
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/**
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* ubi_update_reserved - update bad eraseblock handling accounting data.
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* @ubi: UBI device description object
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*
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* This function calculates the gap between current number of PEBs reserved for
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* bad eraseblock handling and the required level of PEBs that must be
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* reserved, and if necessary, reserves more PEBs to fill that gap, according
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* to availability. Should be called with ubi->volumes_lock held.
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*/
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void ubi_update_reserved(struct ubi_device *ubi)
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{
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int need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
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if (need <= 0 || ubi->avail_pebs == 0)
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return;
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need = min_t(int, need, ubi->avail_pebs);
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ubi->avail_pebs -= need;
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ubi->rsvd_pebs += need;
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ubi->beb_rsvd_pebs += need;
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ubi_msg("reserved more %d PEBs for bad PEB handling", need);
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}
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/**
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* ubi_calculate_reserved - calculate how many PEBs must be reserved for bad
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* eraseblock handling.
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* @ubi: UBI device description object
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*/
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void ubi_calculate_reserved(struct ubi_device *ubi)
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{
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/*
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* Calculate the actual number of PEBs currently needed to be reserved
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* for future bad eraseblock handling.
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*/
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ubi->beb_rsvd_level = ubi->bad_peb_limit - ubi->bad_peb_count;
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if (ubi->beb_rsvd_level < 0) {
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ubi->beb_rsvd_level = 0;
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ubi_warn("number of bad PEBs (%d) is above the expected limit (%d), not reserving any PEBs for bad PEB handling, will use available PEBs (if any)",
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ubi->bad_peb_count, ubi->bad_peb_limit);
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}
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}
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/**
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* ubi_check_pattern - check if buffer contains only a certain byte pattern.
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* @buf: buffer to check
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* @patt: the pattern to check
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* @size: buffer size in bytes
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*
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* This function returns %1 in there are only @patt bytes in @buf, and %0 if
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* something else was also found.
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*/
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int ubi_check_pattern(const void *buf, uint8_t patt, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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if (((const uint8_t *)buf)[i] != patt)
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return 0;
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return 1;
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}
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