+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011 - 2012 Samsung Electronics
* EXT4 filesystem implementation in Uboot by
* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
*
* ext4write : Based on generic ext4 protocol.
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
crc = ext2fs_crc16(crc, desc, offset);
offset += sizeof(desc->bg_checksum); /* skip checksum */
assert(offset == sizeof(*desc));
+ if (offset < fs->gdsize) {
+ crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
+ fs->gdsize - offset);
+ }
}
return crc;
offset = 0;
do {
+ if (offset & 3) {
+ printf("Badly aligned ext2_dirent\n");
+ break;
+ }
+
dir = (struct ext2_dirent *)(block_buffer + offset);
direntname = (char*)(dir) + sizeof(struct ext2_dirent);
static int unlink_filename(char *filename, unsigned int blknr)
{
- int totalbytes = 0;
- int templength = 0;
- int status, inodeno;
- int found = 0;
- char *root_first_block_buffer = NULL;
+ int status;
+ int inodeno = 0;
+ int offset;
+ char *block_buffer = NULL;
struct ext2_dirent *dir = NULL;
- struct ext2_dirent *previous_dir = NULL;
- char *ptr = NULL;
+ struct ext2_dirent *previous_dir;
struct ext_filesystem *fs = get_fs();
int ret = -1;
+ char *direntname;
- /* get the first block of root */
- root_first_block_buffer = zalloc(fs->blksz);
- if (!root_first_block_buffer)
+ block_buffer = zalloc(fs->blksz);
+ if (!block_buffer)
return -ENOMEM;
+
+ /* read the directory block */
status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
- fs->blksz, root_first_block_buffer);
+ fs->blksz, block_buffer);
if (status == 0)
goto fail;
- if (ext4fs_log_journal(root_first_block_buffer, blknr))
- goto fail;
- dir = (struct ext2_dirent *)root_first_block_buffer;
- ptr = (char *)dir;
- totalbytes = 0;
- while (le16_to_cpu(dir->direntlen) >= 0) {
- /*
- * blocksize-totalbytes because last
- * directory length i.e., *dir->direntlen
- * is free availble space in the block that
- * means it is a last entry of directory entry
- */
+ offset = 0;
+ do {
+ if (offset & 3) {
+ printf("Badly aligned ext2_dirent\n");
+ break;
+ }
+
+ previous_dir = dir;
+ dir = (struct ext2_dirent *)(block_buffer + offset);
+ direntname = (char *)(dir) + sizeof(struct ext2_dirent);
+
+ int direntlen = le16_to_cpu(dir->direntlen);
+ if (direntlen < sizeof(struct ext2_dirent))
+ break;
+
if (dir->inode && (strlen(filename) == dir->namelen) &&
- (strncmp(ptr + sizeof(struct ext2_dirent),
- filename, dir->namelen) == 0)) {
- printf("file found, deleting\n");
+ (strncmp(direntname, filename, dir->namelen) == 0)) {
inodeno = le32_to_cpu(dir->inode);
- if (previous_dir) {
- uint16_t new_len;
- new_len = le16_to_cpu(previous_dir->direntlen);
- new_len += le16_to_cpu(dir->direntlen);
- previous_dir->direntlen = cpu_to_le16(new_len);
- } else {
- dir->inode = 0;
- }
- found = 1;
break;
}
- if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen))
- break;
+ offset += direntlen;
- /* traversing the each directory entry */
- templength = le16_to_cpu(dir->direntlen);
- totalbytes = totalbytes + templength;
- previous_dir = dir;
- dir = (struct ext2_dirent *)((char *)dir + templength);
- ptr = (char *)dir;
- }
+ } while (offset < fs->blksz);
+ if (inodeno > 0) {
+ printf("file found, deleting\n");
+ if (ext4fs_log_journal(block_buffer, blknr))
+ goto fail;
- if (found == 1) {
- if (ext4fs_put_metadata(root_first_block_buffer, blknr))
+ if (previous_dir) {
+ /* merge dir entry with predecessor */
+ uint16_t new_len;
+ new_len = le16_to_cpu(previous_dir->direntlen);
+ new_len += le16_to_cpu(dir->direntlen);
+ previous_dir->direntlen = cpu_to_le16(new_len);
+ } else {
+ /* invalidate dir entry */
+ dir->inode = 0;
+ }
+ if (ext4fs_put_metadata(block_buffer, blknr))
goto fail;
ret = inodeno;
}
fail:
- free(root_first_block_buffer);
+ free(block_buffer);
return ret;
}
- get_fs()->dev_desc->log2blksz;
if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
+ long int startblock, endblock;
char *buf = zalloc(blksz);
if (!buf)
return -ENOMEM;
struct ext4_extent_header *ext_block;
struct ext4_extent *extent;
- int i = -1;
+ int i;
ext_block =
ext4fs_get_extent_block(ext4fs_root, buf,
(struct ext4_extent_header *)
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)) {
+ for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
+ startblock = le32_to_cpu(extent[i].ee_block);
+ endblock = startblock + le16_to_cpu(extent[i].ee_len);
+
+ if (startblock > fileblock) {
+ /* Sparse file */
free(buf);
return 0;
- }
- start = le16_to_cpu(extent[i].ee_start_hi);
- start = (start << 32) +
+ } else if (fileblock < endblock) {
+ 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 (fileblock - startblock) + start;
+ }
}
- printf("Extent Error\n");
free(buf);
- return -1;
+ return 0;
}
/* Direct blocks. */
/* Make sure this is an ext2 filesystem. */
if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
- goto fail;
+ goto fail_noerr;
if (le32_to_cpu(data->sblock.revision_level) == 0) {
fs->inodesz = 128;
+ fs->gdsize = 32;
} else {
debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
__le32_to_cpu(data->sblock.feature_compatibility),
return 1;
fail:
printf("Failed to mount ext2 filesystem...\n");
+fail_noerr:
free(data);
ext4fs_root = NULL;
projects / u-boot / blobdiff