3dc604d636
From U-Boot commit: | commit 37f23885e4905ff500a8524328aa3084ac11cdb4 | Author: Ronald Zachariah <rozachar@cisco.com> | Date: Thu Apr 28 07:08:34 2016 +0200 | | fs: ext4: fix symlink read function | | The function ext4fs_read_symlink was unable to handle a symlink | which had target name of exactly 60 characters. | | Signed-off-by: Ronald Zachariah <rozachar@cisco.com> | Signed-off-by: Stefan Roese <sr@denx.de> | Reviewed-by: Stephen Warren <swarren@nvidia.com> | Cc: Tom Rini <trini@konsulko.com> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
554 lines
13 KiB
C
554 lines
13 KiB
C
/*
|
|
* (C) Copyright 2011 - 2012 Samsung Electronics
|
|
* EXT4 filesystem implementation in Uboot by
|
|
* Uma Shankar <uma.shankar@samsung.com>
|
|
* Manjunatha C Achar <a.manjunatha@samsung.com>
|
|
*
|
|
* ext4ls and ext4load : Based on ext2 ls load support in Uboot.
|
|
*
|
|
* (C) Copyright 2004
|
|
* esd gmbh <www.esd-electronics.com>
|
|
* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
|
|
*
|
|
* based on code from grub2 fs/ext2.c and fs/fshelp.c by
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
|
|
*
|
|
* ext4write : Based on generic ext4 protocol.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <malloc.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/time.h>
|
|
#include <linux/magic.h>
|
|
#include <asm/byteorder.h>
|
|
#include <dma.h>
|
|
|
|
#include "ext4_common.h"
|
|
|
|
static struct ext4_extent_header *ext4fs_get_extent_block(struct ext2_data *data,
|
|
char *buf, struct ext4_extent_header *ext_block,
|
|
uint32_t fileblock, int log2_blksz)
|
|
{
|
|
struct ext4_extent_idx *index;
|
|
unsigned long long block;
|
|
struct ext_filesystem *fs = data->fs;
|
|
int blksz = EXT2_BLOCK_SIZE(data);
|
|
int i, ret;
|
|
|
|
while (1) {
|
|
index = (struct ext4_extent_idx *)(ext_block + 1);
|
|
|
|
if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
|
|
return 0;
|
|
|
|
if (ext_block->eh_depth == 0)
|
|
return ext_block;
|
|
i = -1;
|
|
do {
|
|
i++;
|
|
if (i >= le16_to_cpu(ext_block->eh_entries))
|
|
break;
|
|
} while (fileblock >= le32_to_cpu(index[i].ei_block));
|
|
|
|
if (--i < 0)
|
|
return 0;
|
|
|
|
block = le16_to_cpu(index[i].ei_leaf_hi);
|
|
block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
|
|
|
|
ret = ext4fs_devread(fs, block << log2_blksz, 0, blksz, buf);
|
|
if (ret)
|
|
return NULL;
|
|
else
|
|
ext_block = (struct ext4_extent_header *)buf;
|
|
}
|
|
}
|
|
|
|
static int ext4fs_blockgroup(struct ext2_data *data, int group,
|
|
struct ext2_block_group *blkgrp)
|
|
{
|
|
long int blkno;
|
|
unsigned int blkoff, desc_per_blk;
|
|
struct ext_filesystem *fs = data->fs;
|
|
|
|
desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
|
|
|
|
blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
|
|
group / desc_per_blk;
|
|
blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
|
|
|
|
dev_dbg(fs->dev, "read %d group descriptor (blkno %ld blkoff %u)\n",
|
|
group, blkno, blkoff);
|
|
|
|
return ext4fs_devread(fs, blkno << LOG2_EXT2_BLOCK_SIZE(data),
|
|
blkoff, sizeof(struct ext2_block_group),
|
|
(char *)blkgrp);
|
|
}
|
|
|
|
int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
|
|
{
|
|
struct ext2_block_group blkgrp;
|
|
struct ext2_sblock *sblock = &data->sblock;
|
|
struct ext_filesystem *fs = data->fs;
|
|
int inodes_per_block, ret;
|
|
long int blkno;
|
|
unsigned int blkoff;
|
|
|
|
/* It is easier to calculate if the first inode is 0. */
|
|
ino--;
|
|
ret = ext4fs_blockgroup(data, ino / __le32_to_cpu
|
|
(sblock->inodes_per_group), &blkgrp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
|
|
blkno = __le32_to_cpu(blkgrp.inode_table_id) +
|
|
(ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
|
|
blkoff = (ino % inodes_per_block) * fs->inodesz;
|
|
/* Read the inode. */
|
|
ret = ext4fs_devread(fs, blkno << LOG2_EXT2_BLOCK_SIZE(data), blkoff,
|
|
sizeof(struct ext2_inode), (char *)inode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ext4fs_get_indir_block(struct ext2fs_node *node,
|
|
struct ext4fs_indir_block *indir, int blkno)
|
|
{
|
|
struct ext_filesystem *fs = node->data->fs;
|
|
int blksz;
|
|
int ret;
|
|
|
|
blksz = EXT2_BLOCK_SIZE(node->data);
|
|
|
|
if (indir->blkno == blkno)
|
|
return 0;
|
|
|
|
ret = ext4fs_devread(fs, blkno, 0, blksz, (void *)indir->data);
|
|
if (ret) {
|
|
dev_err(fs->dev, "** SI ext2fs read block (indir 1)"
|
|
"failed. **\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
long int read_allocated_block(struct ext2fs_node *node, int fileblock)
|
|
{
|
|
long int blknr;
|
|
int blksz;
|
|
int log2_blksz;
|
|
long int rblock;
|
|
long int perblock_parent;
|
|
long int perblock_child;
|
|
unsigned long long start;
|
|
struct ext2_inode *inode = &node->inode;
|
|
struct ext2_data *data = node->data;
|
|
int ret;
|
|
|
|
/* get the blocksize of the filesystem */
|
|
blksz = EXT2_BLOCK_SIZE(node->data);
|
|
log2_blksz = LOG2_EXT2_BLOCK_SIZE(node->data);
|
|
|
|
if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
|
|
char *buf = zalloc(blksz);
|
|
struct ext4_extent_header *ext_block;
|
|
struct ext4_extent *extent;
|
|
int i = -1;
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
ext_block = ext4fs_get_extent_block(node->data, buf,
|
|
(struct ext4_extent_header *)inode->b.blocks.dir_blocks,
|
|
fileblock, log2_blksz);
|
|
if (!ext_block) {
|
|
pr_err("invalid extent block\n");
|
|
free(buf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
extent = (struct ext4_extent *)(ext_block + 1);
|
|
|
|
do {
|
|
i++;
|
|
if (i >= le16_to_cpu(ext_block->eh_entries))
|
|
break;
|
|
} while (fileblock >= le32_to_cpu(extent[i].ee_block));
|
|
|
|
if (--i >= 0) {
|
|
fileblock -= le32_to_cpu(extent[i].ee_block);
|
|
if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
|
|
start = le16_to_cpu(extent[i].ee_start_hi);
|
|
start = (start << 32) +
|
|
le32_to_cpu(extent[i].ee_start_lo);
|
|
free(buf);
|
|
return fileblock + start;
|
|
}
|
|
|
|
free(buf);
|
|
return -EIO;
|
|
}
|
|
|
|
if (fileblock < INDIRECT_BLOCKS) {
|
|
/* Direct blocks. */
|
|
blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
|
|
} else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
|
|
/* Indirect. */
|
|
ret = ext4fs_get_indir_block(node, &data->indir1,
|
|
__le32_to_cpu(inode->b.blocks.indir_block) << log2_blksz);
|
|
if (ret)
|
|
return ret;
|
|
blknr = __le32_to_cpu(data->indir1.data[fileblock - INDIRECT_BLOCKS]);
|
|
} else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
|
|
(blksz / 4 + 1)))) {
|
|
/* Double indirect. */
|
|
long int perblock = blksz / 4;
|
|
long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
|
|
|
|
ret = ext4fs_get_indir_block(node, &data->indir1,
|
|
__le32_to_cpu(inode->b.blocks.double_indir_block) << log2_blksz);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ext4fs_get_indir_block(node, &data->indir2,
|
|
__le32_to_cpu(data->indir1.data[rblock / perblock]) << log2_blksz);
|
|
if (ret)
|
|
return ret;
|
|
|
|
blknr = __le32_to_cpu(data->indir2.data[rblock % perblock]);
|
|
} else {
|
|
/* Triple indirect. */
|
|
rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
|
|
(blksz / 4 * blksz / 4));
|
|
perblock_child = blksz / 4;
|
|
perblock_parent = ((blksz / 4) * (blksz / 4));
|
|
|
|
ret = ext4fs_get_indir_block(node, &data->indir1,
|
|
__le32_to_cpu(inode->b.blocks.triple_indir_block) << log2_blksz);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ext4fs_get_indir_block(node, &data->indir2,
|
|
__le32_to_cpu(data->indir1.data[rblock / perblock_parent]) << log2_blksz);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ext4fs_get_indir_block(node, &data->indir3,
|
|
__le32_to_cpu(data->indir2.data[rblock / perblock_child]) << log2_blksz);
|
|
if (ret)
|
|
return ret;
|
|
|
|
blknr = __le32_to_cpu(data->indir3.data[rblock % perblock_child]);
|
|
}
|
|
|
|
return blknr;
|
|
}
|
|
|
|
int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
|
|
struct ext2fs_node **fnode, int *ftype)
|
|
{
|
|
unsigned int fpos = 0;
|
|
int status, ret;
|
|
struct ext2fs_node *diro = (struct ext2fs_node *) dir;
|
|
struct ext_filesystem *fs = dir->data->fs;
|
|
|
|
if (name != NULL)
|
|
dev_dbg(fs->dev, "Iterate dir %s\n", name);
|
|
|
|
if (!diro->inode_read) {
|
|
ret = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
/* Search the file. */
|
|
while (fpos < __le32_to_cpu(diro->inode.size)) {
|
|
struct ext2_dirent dirent;
|
|
|
|
status = ext4fs_read_file(diro, fpos,
|
|
sizeof(struct ext2_dirent),
|
|
(char *) &dirent);
|
|
if (status < 1)
|
|
return -EINVAL;
|
|
|
|
if (dirent.namelen != 0) {
|
|
char filename[dirent.namelen + 1];
|
|
struct ext2fs_node *fdiro;
|
|
int type = FILETYPE_UNKNOWN;
|
|
|
|
status = ext4fs_read_file(diro,
|
|
fpos +
|
|
sizeof(struct ext2_dirent),
|
|
dirent.namelen, filename);
|
|
if (status < 1)
|
|
return -EINVAL;
|
|
|
|
fdiro = zalloc(sizeof(struct ext2fs_node));
|
|
if (!fdiro)
|
|
return -ENOMEM;
|
|
|
|
fdiro->data = diro->data;
|
|
fdiro->ino = __le32_to_cpu(dirent.inode);
|
|
|
|
filename[dirent.namelen] = '\0';
|
|
|
|
if (dirent.filetype != FILETYPE_UNKNOWN) {
|
|
fdiro->inode_read = 0;
|
|
|
|
if (dirent.filetype == FILETYPE_DIRECTORY)
|
|
type = FILETYPE_DIRECTORY;
|
|
else if (dirent.filetype == FILETYPE_SYMLINK)
|
|
type = FILETYPE_SYMLINK;
|
|
else if (dirent.filetype == FILETYPE_REG)
|
|
type = FILETYPE_REG;
|
|
} else {
|
|
ret = ext4fs_read_inode(diro->data,
|
|
__le32_to_cpu
|
|
(dirent.inode),
|
|
&fdiro->inode);
|
|
if (ret) {
|
|
free(fdiro);
|
|
return ret;
|
|
}
|
|
fdiro->inode_read = 1;
|
|
|
|
if ((__le16_to_cpu(fdiro->inode.mode) &
|
|
FILETYPE_INO_MASK) ==
|
|
FILETYPE_INO_DIRECTORY) {
|
|
type = FILETYPE_DIRECTORY;
|
|
} else if ((__le16_to_cpu(fdiro->inode.mode)
|
|
& FILETYPE_INO_MASK) ==
|
|
FILETYPE_INO_SYMLINK) {
|
|
type = FILETYPE_SYMLINK;
|
|
} else if ((__le16_to_cpu(fdiro->inode.mode)
|
|
& FILETYPE_INO_MASK) ==
|
|
FILETYPE_INO_REG) {
|
|
type = FILETYPE_REG;
|
|
}
|
|
}
|
|
|
|
dev_dbg(fs->dev, "iterate >%s<\n", filename);
|
|
|
|
if (strcmp(filename, name) == 0) {
|
|
*ftype = type;
|
|
*fnode = fdiro;
|
|
return 0;
|
|
}
|
|
|
|
free(fdiro);
|
|
}
|
|
fpos += __le16_to_cpu(dirent.direntlen);
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
char *ext4fs_read_symlink(struct ext2fs_node *node)
|
|
{
|
|
char *symlink;
|
|
struct ext2fs_node *diro = node;
|
|
int status, ret;
|
|
|
|
if (!diro->inode_read) {
|
|
ret = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
|
|
if (ret)
|
|
return NULL;
|
|
}
|
|
symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
|
|
if (!symlink)
|
|
return 0;
|
|
|
|
if (__le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
|
|
strncpy(symlink, diro->inode.b.symlink,
|
|
__le32_to_cpu(diro->inode.size));
|
|
} else {
|
|
status = ext4fs_read_file(diro, 0,
|
|
__le32_to_cpu(diro->inode.size),
|
|
symlink);
|
|
if (status == 0) {
|
|
free(symlink);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
symlink[__le32_to_cpu(diro->inode.size)] = '\0';
|
|
|
|
return symlink;
|
|
}
|
|
|
|
int ext4fs_find_file(const char *currpath,
|
|
struct ext2fs_node *currroot,
|
|
struct ext2fs_node **currfound, int *foundtype)
|
|
{
|
|
char fpath[strlen(currpath) + 1];
|
|
char *name = fpath;
|
|
char *next;
|
|
int type = FILETYPE_DIRECTORY;
|
|
struct ext2fs_node *currnode = currroot;
|
|
struct ext2fs_node *oldnode = currroot;
|
|
int ret = 0;
|
|
|
|
strncpy(fpath, currpath, strlen(currpath) + 1);
|
|
|
|
/* Remove all leading slashes. */
|
|
while (*name == '/')
|
|
name++;
|
|
|
|
if (!*name) {
|
|
*currfound = currnode;
|
|
goto out;
|
|
}
|
|
|
|
for (;;) {
|
|
/* Extract the actual part from the pathname. */
|
|
next = strchr(name, '/');
|
|
if (next) {
|
|
/* Remove all leading slashes. */
|
|
while (*next == '/')
|
|
*(next++) = '\0';
|
|
}
|
|
|
|
if (type != FILETYPE_DIRECTORY) {
|
|
ext4fs_free_node(currnode, currroot);
|
|
return -ENOENT;
|
|
}
|
|
|
|
oldnode = currnode;
|
|
|
|
/* Iterate over the directory. */
|
|
ret = ext4fs_iterate_dir(currnode, name, &currnode, &type);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ext4fs_free_node(oldnode, currroot);
|
|
|
|
/* Found the node! */
|
|
if (!next || *next == '\0') {
|
|
*currfound = currnode;
|
|
goto out;
|
|
}
|
|
name = next;
|
|
}
|
|
|
|
out:
|
|
if (foundtype)
|
|
*foundtype = type;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ext4fs_open(struct ext2_data *data, const char *filename, struct ext2fs_node **inode)
|
|
{
|
|
struct ext2fs_node *fdiro = NULL;
|
|
int status, ret;
|
|
int type;
|
|
|
|
status = ext4fs_find_file(filename, &data->diropen, &fdiro, &type);
|
|
if (status)
|
|
goto fail;
|
|
|
|
if (type != FILETYPE_REG)
|
|
return -EINVAL;
|
|
|
|
if (!fdiro->inode_read) {
|
|
ret = ext4fs_read_inode(fdiro->data, fdiro->ino,
|
|
&fdiro->inode);
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
|
|
*inode = fdiro;
|
|
|
|
return 0;
|
|
fail:
|
|
ext4fs_free_node(fdiro, &data->diropen);
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
int ext4fs_mount(struct ext_filesystem *fs)
|
|
{
|
|
struct ext2_data *data;
|
|
int ret, blksz;
|
|
|
|
data = zalloc(sizeof(struct ext2_data));
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
/* Read the superblock. */
|
|
ret = ext4fs_devread(fs, 1 * 2, 0, sizeof(struct ext2_sblock),
|
|
(char *)&data->sblock);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
/* Make sure this is an ext2 filesystem. */
|
|
if (__le16_to_cpu(data->sblock.magic) != EXT2_SUPER_MAGIC) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (__le32_to_cpu(data->sblock.revision_level == 0))
|
|
fs->inodesz = 128;
|
|
else
|
|
fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
|
|
|
|
dev_info(fs->dev, "EXT2 rev %d, inode_size %d\n",
|
|
__le32_to_cpu(data->sblock.revision_level), fs->inodesz);
|
|
|
|
data->diropen.data = data;
|
|
data->diropen.ino = 2;
|
|
data->diropen.inode_read = 1;
|
|
data->inode = &data->diropen.inode;
|
|
data->fs = fs;
|
|
fs->data = data;
|
|
|
|
blksz = EXT2_BLOCK_SIZE(data);
|
|
|
|
fs->data->indir1.data = malloc(blksz);
|
|
fs->data->indir2.data = malloc(blksz);
|
|
fs->data->indir3.data = malloc(blksz);
|
|
|
|
if (!fs->data->indir1.data || !fs->data->indir2.data ||
|
|
!fs->data->indir3.data) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ret = ext4fs_read_inode(data, 2, data->inode);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
return 0;
|
|
fail:
|
|
free(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ext4fs_umount(struct ext_filesystem *fs)
|
|
{
|
|
free(fs->data->indir1.data);
|
|
free(fs->data->indir2.data);
|
|
free(fs->data->indir3.data);
|
|
free(fs->data);
|
|
}
|