32 STATIC __u16 ext2fs_group_desc_csum(ext2_filsys fs, dgrp_t group)  in ext2fs_group_desc_csum()  argument
37 	desc = &fs->group_desc[group];  in ext2fs_group_desc_csum()
39 	if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {  in ext2fs_group_desc_csum()
51 		crc = ext2fs_crc16(~0, fs->super->s_uuid,  in ext2fs_group_desc_csum()
52 				   sizeof(fs->super->s_uuid));  in ext2fs_group_desc_csum()
58 		if (offset < fs->super->s_desc_size) {  in ext2fs_group_desc_csum()
60 				    fs->super->s_desc_size - offset);  in ext2fs_group_desc_csum()
67 int ext2fs_group_desc_csum_verify(ext2_filsys fs, dgrp_t group)  in ext2fs_group_desc_csum_verify()  argument
69 	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,  in ext2fs_group_desc_csum_verify()
71 	    (fs->group_desc[group].bg_checksum !=  in ext2fs_group_desc_csum_verify()
72 	     ext2fs_group_desc_csum(fs, group)))  in ext2fs_group_desc_csum_verify()
78 void ext2fs_group_desc_csum_set(ext2_filsys fs, dgrp_t group)  in ext2fs_group_desc_csum_set()  argument
80 	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,  in ext2fs_group_desc_csum_set()
82 		fs->group_desc[group].bg_checksum =  in ext2fs_group_desc_csum_set()
83 			ext2fs_group_desc_csum(fs, group);  in ext2fs_group_desc_csum_set()
103 errcode_t ext2fs_set_gdt_csum(ext2_filsys fs)  in ext2fs_set_gdt_csum()  argument
105 	struct ext2_super_block *sb = fs->super;  in ext2fs_set_gdt_csum()
106 	struct ext2_group_desc *bg = fs->group_desc;  in ext2fs_set_gdt_csum()
110 	if (!fs->inode_map)  in ext2fs_set_gdt_csum()
113 	if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,  in ext2fs_set_gdt_csum()
117 	for (i = 0; i < fs->group_desc_count; i++, bg++) {  in ext2fs_set_gdt_csum()
128 				find_last_inode_ingrp(fs->inode_map,  in ext2fs_set_gdt_csum()
132 		ext2fs_group_desc_csum_set(fs, i);  in ext2fs_set_gdt_csum()
141 		ext2fs_mark_super_dirty(fs);  in ext2fs_set_gdt_csum()
148 void print_csum(const char *msg, ext2_filsys fs, dgrp_t group)  in print_csum()  argument
152 	struct ext2_group_desc *desc = &fs->group_desc[group];  in print_csum()
153 	struct ext2_super_block *sb = fs->super;  in print_csum()
156 	struct ext2_group_desc swabdesc = fs->group_desc[group];  in print_csum()
167 	crc1 = ext2fs_crc16(~0, sb->s_uuid, sizeof(fs->super->s_uuid));  in print_csum()
173 	       ext2fs_group_desc_csum(fs, group));  in print_csum()
183 	ext2_filsys		fs;  in main()  local
191 				   test_io_manager, &fs);  in main()
197 	memcpy(fs->super->s_uuid, sb_uuid, 16);  in main()
198 	fs->super->s_feature_ro_compat = EXT4_FEATURE_RO_COMPAT_GDT_CSUM;  in main()
200 	for (i=0; i < fs->group_desc_count; i++) {  in main()
201 		fs->group_desc[i].bg_block_bitmap = 124;  in main()
202 		fs->group_desc[i].bg_inode_bitmap = 125;  in main()
203 		fs->group_desc[i].bg_inode_table = 126;  in main()
204 		fs->group_desc[i].bg_free_blocks_count = 31119;  in main()
205 		fs->group_desc[i].bg_free_inodes_count = 15701;  in main()
206 		fs->group_desc[i].bg_used_dirs_count = 2;  in main()
207 		fs->group_desc[i].bg_flags = 0;  in main()
210 	csum1 = ext2fs_group_desc_csum(fs, 0);  in main()
211 	print_csum("csum0000", fs, 0);  in main()
217 	csum2 = ext2fs_group_desc_csum(fs, 1);  in main()
218 	print_csum("csum0001", fs, 1);  in main()
223 	csum2 = ext2fs_group_desc_csum(fs, 2);  in main()
224 	print_csum("csumffff", fs, 2);  in main()
229 	fs->group_desc[0].bg_checksum = csum1;  in main()
230 	csum2 = ext2fs_group_desc_csum(fs, 0);  in main()
231 	print_csum("csum_set", fs, 0);  in main()
236 	if (!ext2fs_group_desc_csum_verify(fs, 0)) {  in main()
240 	memset(fs->super->s_uuid, 0x30, sizeof(fs->super->s_uuid));  in main()
241 	print_csum("new_uuid", fs, 0);  in main()
242 	if (ext2fs_group_desc_csum_verify(fs, 0) != 0) {  in main()
246 	csum1 = fs->group_desc[0].bg_checksum = ext2fs_group_desc_csum(fs, 0);  in main()
247 	print_csum("csum_new", fs, 0);  in main()
248 	fs->group_desc[0].bg_free_blocks_count = 1;  in main()
249 	csum2 = ext2fs_group_desc_csum(fs, 0);  in main()
250 	print_csum("csum_blk", fs, 0);  in main()