mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 00:48:52 +09:00
![Stefan Roese](/assets/img/avatar_default.png)
The U-Boot UBIFS implementation is largely a direct copy from the current Linux version (2.6.29-rc6). As already done in the UBI version we have an "abstraction layer" to redefine or remove some OS calls (e.g. mutex_lock() ...). This makes it possible to use the original Linux code with very little changes. And by this we can better update to later Linux versions. I removed some of the Linux features that are not used in the U-Boot version (e.g. garbage-collection, write support). Signed-off-by: Stefan Roese <sr@denx.de> CC: Artem Bityutskiy <dedekind@infradead.org> CC: Adrian Hunter <ext-Adrian.Hunter@nokia.com>
363 lines
8.9 KiB
C
363 lines
8.9 KiB
C
/*
|
|
* This file is part of UBIFS.
|
|
*
|
|
* Copyright (C) 2006-2008 Nokia Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 51
|
|
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Authors: Adrian Hunter
|
|
* Artem Bityutskiy (Битюцкий Артём)
|
|
*/
|
|
|
|
/*
|
|
* This file implements the scan which is a general-purpose function for
|
|
* determining what nodes are in an eraseblock. The scan is used to replay the
|
|
* journal, to do garbage collection. for the TNC in-the-gaps method, and by
|
|
* debugging functions.
|
|
*/
|
|
|
|
#include "ubifs.h"
|
|
|
|
/**
|
|
* scan_padding_bytes - scan for padding bytes.
|
|
* @buf: buffer to scan
|
|
* @len: length of buffer
|
|
*
|
|
* This function returns the number of padding bytes on success and
|
|
* %SCANNED_GARBAGE on failure.
|
|
*/
|
|
static int scan_padding_bytes(void *buf, int len)
|
|
{
|
|
int pad_len = 0, max_pad_len = min_t(int, UBIFS_PAD_NODE_SZ, len);
|
|
uint8_t *p = buf;
|
|
|
|
dbg_scan("not a node");
|
|
|
|
while (pad_len < max_pad_len && *p++ == UBIFS_PADDING_BYTE)
|
|
pad_len += 1;
|
|
|
|
if (!pad_len || (pad_len & 7))
|
|
return SCANNED_GARBAGE;
|
|
|
|
dbg_scan("%d padding bytes", pad_len);
|
|
|
|
return pad_len;
|
|
}
|
|
|
|
/**
|
|
* ubifs_scan_a_node - scan for a node or padding.
|
|
* @c: UBIFS file-system description object
|
|
* @buf: buffer to scan
|
|
* @len: length of buffer
|
|
* @lnum: logical eraseblock number
|
|
* @offs: offset within the logical eraseblock
|
|
* @quiet: print no messages
|
|
*
|
|
* This function returns a scanning code to indicate what was scanned.
|
|
*/
|
|
int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
|
|
int offs, int quiet)
|
|
{
|
|
struct ubifs_ch *ch = buf;
|
|
uint32_t magic;
|
|
|
|
magic = le32_to_cpu(ch->magic);
|
|
|
|
if (magic == 0xFFFFFFFF) {
|
|
dbg_scan("hit empty space");
|
|
return SCANNED_EMPTY_SPACE;
|
|
}
|
|
|
|
if (magic != UBIFS_NODE_MAGIC)
|
|
return scan_padding_bytes(buf, len);
|
|
|
|
if (len < UBIFS_CH_SZ)
|
|
return SCANNED_GARBAGE;
|
|
|
|
dbg_scan("scanning %s", dbg_ntype(ch->node_type));
|
|
|
|
if (ubifs_check_node(c, buf, lnum, offs, quiet, 1))
|
|
return SCANNED_A_CORRUPT_NODE;
|
|
|
|
if (ch->node_type == UBIFS_PAD_NODE) {
|
|
struct ubifs_pad_node *pad = buf;
|
|
int pad_len = le32_to_cpu(pad->pad_len);
|
|
int node_len = le32_to_cpu(ch->len);
|
|
|
|
/* Validate the padding node */
|
|
if (pad_len < 0 ||
|
|
offs + node_len + pad_len > c->leb_size) {
|
|
if (!quiet) {
|
|
ubifs_err("bad pad node at LEB %d:%d",
|
|
lnum, offs);
|
|
dbg_dump_node(c, pad);
|
|
}
|
|
return SCANNED_A_BAD_PAD_NODE;
|
|
}
|
|
|
|
/* Make the node pads to 8-byte boundary */
|
|
if ((node_len + pad_len) & 7) {
|
|
if (!quiet) {
|
|
dbg_err("bad padding length %d - %d",
|
|
offs, offs + node_len + pad_len);
|
|
}
|
|
return SCANNED_A_BAD_PAD_NODE;
|
|
}
|
|
|
|
dbg_scan("%d bytes padded, offset now %d",
|
|
pad_len, ALIGN(offs + node_len + pad_len, 8));
|
|
|
|
return node_len + pad_len;
|
|
}
|
|
|
|
return SCANNED_A_NODE;
|
|
}
|
|
|
|
/**
|
|
* ubifs_start_scan - create LEB scanning information at start of scan.
|
|
* @c: UBIFS file-system description object
|
|
* @lnum: logical eraseblock number
|
|
* @offs: offset to start at (usually zero)
|
|
* @sbuf: scan buffer (must be c->leb_size)
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum,
|
|
int offs, void *sbuf)
|
|
{
|
|
struct ubifs_scan_leb *sleb;
|
|
int err;
|
|
|
|
dbg_scan("scan LEB %d:%d", lnum, offs);
|
|
|
|
sleb = kzalloc(sizeof(struct ubifs_scan_leb), GFP_NOFS);
|
|
if (!sleb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
sleb->lnum = lnum;
|
|
INIT_LIST_HEAD(&sleb->nodes);
|
|
sleb->buf = sbuf;
|
|
|
|
err = ubi_read(c->ubi, lnum, sbuf + offs, offs, c->leb_size - offs);
|
|
if (err && err != -EBADMSG) {
|
|
ubifs_err("cannot read %d bytes from LEB %d:%d,"
|
|
" error %d", c->leb_size - offs, lnum, offs, err);
|
|
kfree(sleb);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
if (err == -EBADMSG)
|
|
sleb->ecc = 1;
|
|
|
|
return sleb;
|
|
}
|
|
|
|
/**
|
|
* ubifs_end_scan - update LEB scanning information at end of scan.
|
|
* @c: UBIFS file-system description object
|
|
* @sleb: scanning information
|
|
* @lnum: logical eraseblock number
|
|
* @offs: offset to start at (usually zero)
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
|
|
int lnum, int offs)
|
|
{
|
|
lnum = lnum;
|
|
dbg_scan("stop scanning LEB %d at offset %d", lnum, offs);
|
|
ubifs_assert(offs % c->min_io_size == 0);
|
|
|
|
sleb->endpt = ALIGN(offs, c->min_io_size);
|
|
}
|
|
|
|
/**
|
|
* ubifs_add_snod - add a scanned node to LEB scanning information.
|
|
* @c: UBIFS file-system description object
|
|
* @sleb: scanning information
|
|
* @buf: buffer containing node
|
|
* @offs: offset of node on flash
|
|
*
|
|
* This function returns %0 on success and a negative error code on failure.
|
|
*/
|
|
int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
|
|
void *buf, int offs)
|
|
{
|
|
struct ubifs_ch *ch = buf;
|
|
struct ubifs_ino_node *ino = buf;
|
|
struct ubifs_scan_node *snod;
|
|
|
|
snod = kzalloc(sizeof(struct ubifs_scan_node), GFP_NOFS);
|
|
if (!snod)
|
|
return -ENOMEM;
|
|
|
|
snod->sqnum = le64_to_cpu(ch->sqnum);
|
|
snod->type = ch->node_type;
|
|
snod->offs = offs;
|
|
snod->len = le32_to_cpu(ch->len);
|
|
snod->node = buf;
|
|
|
|
switch (ch->node_type) {
|
|
case UBIFS_INO_NODE:
|
|
case UBIFS_DENT_NODE:
|
|
case UBIFS_XENT_NODE:
|
|
case UBIFS_DATA_NODE:
|
|
case UBIFS_TRUN_NODE:
|
|
/*
|
|
* The key is in the same place in all keyed
|
|
* nodes.
|
|
*/
|
|
key_read(c, &ino->key, &snod->key);
|
|
break;
|
|
}
|
|
list_add_tail(&snod->list, &sleb->nodes);
|
|
sleb->nodes_cnt += 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ubifs_scanned_corruption - print information after UBIFS scanned corruption.
|
|
* @c: UBIFS file-system description object
|
|
* @lnum: LEB number of corruption
|
|
* @offs: offset of corruption
|
|
* @buf: buffer containing corruption
|
|
*/
|
|
void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
|
|
void *buf)
|
|
{
|
|
int len;
|
|
|
|
ubifs_err("corrupted data at LEB %d:%d", lnum, offs);
|
|
if (dbg_failure_mode)
|
|
return;
|
|
len = c->leb_size - offs;
|
|
if (len > 4096)
|
|
len = 4096;
|
|
dbg_err("first %d bytes from LEB %d:%d", len, lnum, offs);
|
|
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 4, buf, len, 1);
|
|
}
|
|
|
|
/**
|
|
* ubifs_scan - scan a logical eraseblock.
|
|
* @c: UBIFS file-system description object
|
|
* @lnum: logical eraseblock number
|
|
* @offs: offset to start at (usually zero)
|
|
* @sbuf: scan buffer (must be c->leb_size)
|
|
*
|
|
* This function scans LEB number @lnum and returns complete information about
|
|
* its contents. Returns an error code in case of failure.
|
|
*/
|
|
struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
|
|
int offs, void *sbuf)
|
|
{
|
|
void *buf = sbuf + offs;
|
|
int err, len = c->leb_size - offs;
|
|
struct ubifs_scan_leb *sleb;
|
|
|
|
sleb = ubifs_start_scan(c, lnum, offs, sbuf);
|
|
if (IS_ERR(sleb))
|
|
return sleb;
|
|
|
|
while (len >= 8) {
|
|
struct ubifs_ch *ch = buf;
|
|
int node_len, ret;
|
|
|
|
dbg_scan("look at LEB %d:%d (%d bytes left)",
|
|
lnum, offs, len);
|
|
|
|
cond_resched();
|
|
|
|
ret = ubifs_scan_a_node(c, buf, len, lnum, offs, 0);
|
|
|
|
if (ret > 0) {
|
|
/* Padding bytes or a valid padding node */
|
|
offs += ret;
|
|
buf += ret;
|
|
len -= ret;
|
|
continue;
|
|
}
|
|
|
|
if (ret == SCANNED_EMPTY_SPACE)
|
|
/* Empty space is checked later */
|
|
break;
|
|
|
|
switch (ret) {
|
|
case SCANNED_GARBAGE:
|
|
dbg_err("garbage");
|
|
goto corrupted;
|
|
case SCANNED_A_NODE:
|
|
break;
|
|
case SCANNED_A_CORRUPT_NODE:
|
|
case SCANNED_A_BAD_PAD_NODE:
|
|
dbg_err("bad node");
|
|
goto corrupted;
|
|
default:
|
|
dbg_err("unknown");
|
|
goto corrupted;
|
|
}
|
|
|
|
err = ubifs_add_snod(c, sleb, buf, offs);
|
|
if (err)
|
|
goto error;
|
|
|
|
node_len = ALIGN(le32_to_cpu(ch->len), 8);
|
|
offs += node_len;
|
|
buf += node_len;
|
|
len -= node_len;
|
|
}
|
|
|
|
if (offs % c->min_io_size)
|
|
goto corrupted;
|
|
|
|
ubifs_end_scan(c, sleb, lnum, offs);
|
|
|
|
for (; len > 4; offs += 4, buf = buf + 4, len -= 4)
|
|
if (*(uint32_t *)buf != 0xffffffff)
|
|
break;
|
|
for (; len; offs++, buf++, len--)
|
|
if (*(uint8_t *)buf != 0xff) {
|
|
ubifs_err("corrupt empty space at LEB %d:%d",
|
|
lnum, offs);
|
|
goto corrupted;
|
|
}
|
|
|
|
return sleb;
|
|
|
|
corrupted:
|
|
ubifs_scanned_corruption(c, lnum, offs, buf);
|
|
err = -EUCLEAN;
|
|
error:
|
|
ubifs_err("LEB %d scanning failed", lnum);
|
|
ubifs_scan_destroy(sleb);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* ubifs_scan_destroy - destroy LEB scanning information.
|
|
* @sleb: scanning information to free
|
|
*/
|
|
void ubifs_scan_destroy(struct ubifs_scan_leb *sleb)
|
|
{
|
|
struct ubifs_scan_node *node;
|
|
struct list_head *head;
|
|
|
|
head = &sleb->nodes;
|
|
while (!list_empty(head)) {
|
|
node = list_entry(head->next, struct ubifs_scan_node, list);
|
|
list_del(&node->list);
|
|
kfree(node);
|
|
}
|
|
kfree(sleb);
|
|
}
|