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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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/* Here we keep miscellaneous functions which are used all over the UBI code */
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#include <ubi_uboot.h>
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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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cond_resched();
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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(ubi, "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(ubi, "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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