[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/e2fsprogs/e2fsprogs-1.42.9/lib/ext2fs/csum.c b/ap/app/e2fsprogs/e2fsprogs-1.42.9/lib/ext2fs/csum.c
new file mode 100644
index 0000000..b681d34
--- /dev/null
+++ b/ap/app/e2fsprogs/e2fsprogs-1.42.9/lib/ext2fs/csum.c
@@ -0,0 +1,308 @@
+/*
+ * csum.c --- checksumming of ext3 structures
+ *
+ * Copyright (C) 2006 Cluster File Systems, Inc.
+ * Copyright (C) 2006, 2007 by Andreas Dilger <adilger@clusterfs.com>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+#include "crc16.h"
+#include <assert.h>
+
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
+#ifdef DEBUG
+#define STATIC
+#else
+#define STATIC static
+#endif
+
+__u16 ext2fs_group_desc_csum(ext2_filsys fs, dgrp_t group)
+{
+ struct ext2_group_desc *desc = ext2fs_group_desc(fs, fs->group_desc,
+ group);
+ size_t size = EXT2_DESC_SIZE(fs->super);
+ size_t offset;
+ __u16 crc;
+
+ if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
+ size_t offset = offsetof(struct ext2_group_desc, bg_checksum);
+
+#ifdef WORDS_BIGENDIAN
+ struct ext4_group_desc swabdesc;
+ size_t save_size = size;
+ const size_t ext4_bg_size = sizeof(struct ext4_group_desc);
+ struct ext2_group_desc *save_desc = desc;
+
+ /* Have to swab back to little-endian to do the checksum */
+ if (size > ext4_bg_size)
+ size = ext4_bg_size;
+ memcpy(&swabdesc, desc, size);
+ ext2fs_swap_group_desc2(fs,
+ (struct ext2_group_desc *) &swabdesc);
+ desc = (struct ext2_group_desc *) &swabdesc;
+
+ group = ext2fs_swab32(group);
+#endif
+ crc = ext2fs_crc16(~0, fs->super->s_uuid,
+ sizeof(fs->super->s_uuid));
+ crc = ext2fs_crc16(crc, &group, sizeof(group));
+ crc = ext2fs_crc16(crc, desc, offset);
+ offset += sizeof(desc->bg_checksum); /* skip checksum */
+ /* for checksum of struct ext4_group_desc do the rest...*/
+ if (offset < size) {
+ crc = ext2fs_crc16(crc, (char *)desc + offset,
+ size - offset);
+ }
+#ifdef WORDS_BIGENDIAN
+ /*
+ * If the size of the bg descriptor is greater than 64
+ * bytes, which is the size of the traditional ext4 bg
+ * descriptor, checksum the rest of the descriptor here
+ */
+ if (save_size > ext4_bg_size)
+ crc = ext2fs_crc16(crc,
+ (char *)save_desc + ext4_bg_size,
+ save_size - ext4_bg_size);
+#endif
+ }
+
+ return crc;
+}
+
+int ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group)
+{
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
+ (ext2fs_bg_checksum(fs, group) !=
+ ext2fs_group_desc_csum(fs, group)))
+ return 0;
+
+ return 1;
+}
+
+void ext2fs_group_desc_csum_set(ext2_filsys fs, dgrp_t group)
+{
+ if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ return;
+
+ /* ext2fs_bg_checksum_set() sets the actual checksum field but
+ * does not calculate the checksum itself. */
+ ext2fs_bg_checksum_set(fs, group, ext2fs_group_desc_csum(fs, group));
+}
+
+static __u32 find_last_inode_ingrp(ext2fs_inode_bitmap bitmap,
+ __u32 inodes_per_grp, dgrp_t grp_no)
+{
+ ext2_ino_t i, start_ino, end_ino;
+
+ start_ino = grp_no * inodes_per_grp + 1;
+ end_ino = start_ino + inodes_per_grp - 1;
+
+ for (i = end_ino; i >= start_ino; i--) {
+ if (ext2fs_fast_test_inode_bitmap2(bitmap, i))
+ return i - start_ino + 1;
+ }
+ return inodes_per_grp;
+}
+
+/* update the bitmap flags, set the itable high watermark, and calculate
+ * checksums for the group descriptors */
+errcode_t ext2fs_set_gdt_csum(ext2_filsys fs)
+{
+ struct ext2_super_block *sb = fs->super;
+ int dirty = 0;
+ dgrp_t i;
+
+ if (!fs->inode_map)
+ return EXT2_ET_NO_INODE_BITMAP;
+
+ if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ return 0;
+
+ for (i = 0; i < fs->group_desc_count; i++) {
+ __u32 old_csum = ext2fs_bg_checksum(fs, i);
+ __u32 old_unused = ext2fs_bg_itable_unused(fs, i);
+ __u32 old_flags = ext2fs_bg_flags(fs, i);
+ __u32 old_free_inodes_count = ext2fs_bg_free_inodes_count(fs, i);
+
+ if (old_free_inodes_count == sb->s_inodes_per_group) {
+ ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
+ ext2fs_bg_itable_unused_set(fs, i, sb->s_inodes_per_group);
+ } else {
+ int unused =
+ sb->s_inodes_per_group -
+ find_last_inode_ingrp(fs->inode_map,
+ sb->s_inodes_per_group, i);
+
+ ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
+ ext2fs_bg_itable_unused_set(fs, i, unused);
+ }
+
+ ext2fs_group_desc_csum_set(fs, i);
+ if (old_flags != ext2fs_bg_flags(fs, i))
+ dirty = 1;
+ if (old_unused != ext2fs_bg_itable_unused(fs, i))
+ dirty = 1;
+ if (old_csum != ext2fs_bg_checksum(fs, i))
+ dirty = 1;
+ }
+ if (dirty)
+ ext2fs_mark_super_dirty(fs);
+ return 0;
+}
+
+#ifdef DEBUG
+#include "e2p/e2p.h"
+
+void print_csum(const char *msg, ext2_filsys fs, dgrp_t group)
+{
+ __u16 crc1, crc2, crc3;
+ dgrp_t swabgroup;
+ struct ext2_group_desc *desc = ext2fs_group_desc(fs, fs->group_desc,
+ group);
+ size_t size = EXT2_DESC_SIZE(fs->super);
+ struct ext2_super_block *sb = fs->super;
+ int offset = offsetof(struct ext2_group_desc, bg_checksum);
+#ifdef WORDS_BIGENDIAN
+ struct ext4_group_desc swabdesc;
+ struct ext2_group_desc *save_desc = desc;
+ const size_t ext4_bg_size = sizeof(struct ext4_group_desc);
+ size_t save_size = size;
+#endif
+
+#ifdef WORDS_BIGENDIAN
+ /* Have to swab back to little-endian to do the checksum */
+ if (size > ext4_bg_size)
+ size = ext4_bg_size;
+ memcpy(&swabdesc, desc, size);
+ ext2fs_swap_group_desc2(fs, (struct ext2_group_desc *) &swabdesc);
+ desc = (struct ext2_group_desc *) &swabdesc;
+
+ swabgroup = ext2fs_swab32(group);
+#else
+ swabgroup = group;
+#endif
+
+ crc1 = ext2fs_crc16(~0, sb->s_uuid, sizeof(fs->super->s_uuid));
+ crc2 = ext2fs_crc16(crc1, &swabgroup, sizeof(swabgroup));
+ crc3 = ext2fs_crc16(crc2, desc, offset);
+ offset += sizeof(desc->bg_checksum); /* skip checksum */
+ /* for checksum of struct ext4_group_desc do the rest...*/
+ if (offset < size)
+ crc3 = ext2fs_crc16(crc3, (char *)desc + offset, size - offset);
+#ifdef WORDS_BIGENDIAN
+ if (save_size > ext4_bg_size)
+ crc3 = ext2fs_crc16(crc3, (char *)save_desc + ext4_bg_size,
+ save_size - ext4_bg_size);
+#endif
+
+ printf("%s UUID %s=%04x, grp %u=%04x: %04x=%04x\n",
+ msg, e2p_uuid2str(sb->s_uuid), crc1, group, crc2, crc3,
+ ext2fs_group_desc_csum(fs, group));
+}
+
+unsigned char sb_uuid[16] = { 0x4f, 0x25, 0xe8, 0xcf, 0xe7, 0x97, 0x48, 0x23,
+ 0xbe, 0xfa, 0xa7, 0x88, 0x4b, 0xae, 0xec, 0xdb };
+
+int main(int argc, char **argv)
+{
+ struct ext2_super_block param;
+ errcode_t retval;
+ ext2_filsys fs;
+ int i;
+ __u16 csum1, csum2, csum_known = 0xd3a4;
+
+ memset(¶m, 0, sizeof(param));
+ ext2fs_blocks_count_set(¶m, 32768);
+#if 0
+ param.s_feature_incompat |= EXT4_FEATURE_INCOMPAT_64BIT;
+ param.s_desc_size = 128;
+ csum_known = 0x5b6e;
+#endif
+
+ retval = ext2fs_initialize("test fs", EXT2_FLAG_64BITS, ¶m,
+ test_io_manager, &fs);
+ if (retval) {
+ com_err("setup", retval,
+ "While initializing filesystem");
+ exit(1);
+ }
+ memcpy(fs->super->s_uuid, sb_uuid, 16);
+ fs->super->s_feature_ro_compat = EXT4_FEATURE_RO_COMPAT_GDT_CSUM;
+
+ for (i=0; i < fs->group_desc_count; i++) {
+ ext2fs_block_bitmap_loc_set(fs, i, 124);
+ ext2fs_inode_bitmap_loc_set(fs, i, 125);
+ ext2fs_inode_table_loc_set(fs, i, 126);
+ ext2fs_bg_free_blocks_count_set(fs, i, 31119);
+ ext2fs_bg_free_inodes_count_set(fs, i, 15701);
+ ext2fs_bg_used_dirs_count_set(fs, i, 2);
+ ext2fs_bg_flags_zap(fs, i);
+ };
+
+ csum1 = ext2fs_group_desc_csum(fs, 0);
+ print_csum("csum0000", fs, 0);
+
+ if (csum1 != csum_known) {
+ printf("checksum for group 0 should be %04x\n", csum_known);
+ exit(1);
+ }
+ csum2 = ext2fs_group_desc_csum(fs, 1);
+ print_csum("csum0001", fs, 1);
+ if (csum1 == csum2) {
+ printf("checksums for different groups shouldn't match\n");
+ exit(1);
+ }
+ csum2 = ext2fs_group_desc_csum(fs, 2);
+ print_csum("csumffff", fs, 2);
+ if (csum1 == csum2) {
+ printf("checksums for different groups shouldn't match\n");
+ exit(1);
+ }
+ ext2fs_bg_checksum_set(fs, 0, csum1);
+ csum2 = ext2fs_group_desc_csum(fs, 0);
+ print_csum("csum_set", fs, 0);
+ if (csum1 != csum2) {
+ printf("checksums should not depend on checksum field\n");
+ exit(1);
+ }
+ if (!ext2fs_group_desc_csum_verify(fs, 0)) {
+ printf("checksums should verify against gd_checksum\n");
+ exit(1);
+ }
+ memset(fs->super->s_uuid, 0x30, sizeof(fs->super->s_uuid));
+ print_csum("new_uuid", fs, 0);
+ if (ext2fs_group_desc_csum_verify(fs, 0) != 0) {
+ printf("checksums for different filesystems shouldn't match\n");
+ exit(1);
+ }
+ csum1 = ext2fs_group_desc_csum(fs, 0);
+ ext2fs_bg_checksum_set(fs, 0, csum1);
+ print_csum("csum_new", fs, 0);
+ ext2fs_bg_free_blocks_count_set(fs, 0, 1);
+ csum2 = ext2fs_group_desc_csum(fs, 0);
+ print_csum("csum_blk", fs, 0);
+ if (csum1 == csum2) {
+ printf("checksums for different data shouldn't match\n");
+ exit(1);
+ }
+
+ return 0;
+}
+#endif