diff options
Diffstat (limited to '')
| -rw-r--r-- | debugfs/set_fields.c | 1024 |
1 files changed, 1024 insertions, 0 deletions
diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c new file mode 100644 index 0000000..f916dea --- /dev/null +++ b/debugfs/set_fields.c @@ -0,0 +1,1024 @@ +/* + * set_fields.c --- set a superblock value + * + * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ + +#define _XOPEN_SOURCE 600 /* for inclusion of strptime() and strtoull */ + +#ifdef HAVE_STRTOULL +#define STRTOULL strtoull +#else +#define STRTOULL strtoul +#endif + +#include "config.h" +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <ctype.h> +#include <string.h> +#include <strings.h> +#include <time.h> +#include <sys/types.h> +#include <sys/stat.h> +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#include <assert.h> +#if HAVE_STRINGS_H +#include <strings.h> +#endif +#include <fcntl.h> +#include <utime.h> + +#include "debugfs.h" +#include "uuid/uuid.h" +#include "e2p/e2p.h" +#include "support/quotaio.h" + +static struct ext2_super_block set_sb; +static struct ext2_inode_large set_inode; +static struct ext2_group_desc set_gd; +static struct ext4_group_desc set_gd4; +static struct mmp_struct set_mmp; +static dgrp_t set_bg; +static ext2_ino_t set_ino; +static int array_idx; + +#define FLAG_ARRAY 0x0001 +#define FLAG_ALIAS 0x0002 /* Data intersects with other field */ +#define FLAG_CSUM 0x0004 + +struct field_set_info { + const char *name; + void *ptr; + void *ptr2; + unsigned int size; + errcode_t (*func)(struct field_set_info *info, char *field, char *arg); + int flags; + int max_idx; +}; + +static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_int(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_string(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_encoding(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_time(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg); +static errcode_t parse_inode_csum(struct field_set_info *info, char *field, + char *arg); +static errcode_t parse_mmp_clear(struct field_set_info *info, char *field, + char *arg); + +#if __GNUC_PREREQ (4, 6) || defined(__clang__) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wmissing-field-initializers" +#endif + +static struct field_set_info super_fields[] = { + { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint }, + { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi, + 4, parse_uint }, + { "r_blocks_count", &set_sb.s_r_blocks_count, + &set_sb.s_r_blocks_count_hi, 4, parse_uint }, + { "free_blocks_count", &set_sb.s_free_blocks_count, + &set_sb.s_free_blocks_hi, 4, parse_uint }, + { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint }, + { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint }, + { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint }, + { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int }, + { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint }, + { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint }, + { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint }, + { "mtime", &set_sb.s_mtime, NULL, 4, parse_time }, + { "wtime", &set_sb.s_wtime, NULL, 4, parse_time }, + { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint }, + { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int }, + /* s_magic */ + { "state", &set_sb.s_state, NULL, 2, parse_uint }, + { "errors", &set_sb.s_errors, NULL, 2, parse_uint }, + { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint }, + { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time }, + { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint }, + { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint }, + { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint }, + { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint }, + { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint }, + { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint }, + { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint }, + { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint }, + { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint }, + { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint }, + { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint }, + { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid }, + { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string }, + { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string }, + { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL, + 4, parse_uint }, + { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint }, + { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1, + parse_uint }, + { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2, + parse_uint }, + { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid }, + { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint }, + { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint }, + { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint }, + { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid }, + { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg }, + { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint }, + { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint }, + { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint }, + { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint }, + { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time }, + { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY, + 17 }, + { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint }, + { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint }, + { "flags", &set_sb.s_flags, NULL, 4, parse_uint }, + { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint }, + { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint }, + { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint }, + { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint }, + { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint }, + { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint }, + { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint }, + { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint }, + { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, + NULL, 8, parse_uint }, + { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint }, + { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string }, + { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint }, + { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint }, + { "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint }, + { "overhead_clusters", &set_sb.s_overhead_clusters, NULL, 4, parse_uint }, + { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint, + FLAG_ARRAY, 2 }, + { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint }, + { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint }, + { "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint }, + { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint }, + { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time }, + { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint }, + { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint }, + { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string }, + { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint }, + { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time }, + { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint }, + { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint }, + { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string }, + { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint }, + { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint, + FLAG_ARRAY, 4 }, + { "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid }, + { "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint }, + { "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint }, + { "encoding", &set_sb.s_encoding, NULL, 2, parse_encoding }, + { "orphan_file_inum", &set_sb.s_orphan_file_inum, NULL, 4, parse_uint }, + { 0, 0, 0, 0 } +}; + +static struct field_set_info inode_fields[] = { + { "mode", &set_inode.i_mode, NULL, 2, parse_uint }, + { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high, + 2, parse_uint }, + { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint }, + { "atime", &set_inode.i_atime, &set_inode.i_atime_extra, + 4, parse_time }, + { "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra, + 4, parse_time }, + { "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra, + 4, parse_time }, + { "dtime", &set_inode.i_dtime, NULL, + 4, parse_time }, + { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high, + 2, parse_uint }, + { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint }, + /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */ + { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi, + 6, parse_uint }, + { "flags", &set_inode.i_flags, NULL, 4, parse_uint }, + { "version", &set_inode.osd1.linux1.l_i_version, + &set_inode.i_version_hi, 4, parse_uint }, + { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, + 4, parse_uint, FLAG_ALIAS }, + { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY, + EXT2_NDIR_BLOCKS }, + { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint }, + { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint }, + { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint }, + { "generation", &set_inode.i_generation, NULL, 4, parse_uint }, + /* Special case: i_file_acl_high is 2 bytes */ + { "file_acl", &set_inode.i_file_acl, + &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint }, + { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint }, + { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS }, + { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint }, + { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, + &set_inode.i_checksum_hi, 2, parse_inode_csum, FLAG_CSUM }, + { "author", &set_inode.osd2.hurd2.h_i_author, NULL, + 4, parse_uint, FLAG_ALIAS }, + { "extra_isize", &set_inode.i_extra_isize, NULL, + 2, parse_uint }, + { "ctime_extra", &set_inode.i_ctime_extra, NULL, + 4, parse_uint, FLAG_ALIAS }, + { "mtime_extra", &set_inode.i_mtime_extra, NULL, + 4, parse_uint, FLAG_ALIAS }, + { "atime_extra", &set_inode.i_atime_extra, NULL, + 4, parse_uint, FLAG_ALIAS }, + { "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra, + 4, parse_time }, + { "crtime_extra", &set_inode.i_crtime_extra, NULL, + 4, parse_uint, FLAG_ALIAS }, + { "projid", &set_inode.i_projid, NULL, 4, parse_uint }, + { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY }, + { 0, 0, 0, 0 } +}; + +static struct field_set_info ext2_bg_fields[] = { + { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint }, + { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint }, + { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint }, + { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint }, + { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint }, + { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint }, + { "flags", &set_gd.bg_flags, NULL, 2, parse_uint }, + { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint }, + { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum }, + { 0, 0, 0, 0 } +}; + +static struct field_set_info ext4_bg_fields[] = { + { "block_bitmap", &set_gd4.bg_block_bitmap, + &set_gd4.bg_block_bitmap_hi, 4, parse_uint }, + { "inode_bitmap", &set_gd4.bg_inode_bitmap, + &set_gd4.bg_inode_bitmap_hi, 4, parse_uint }, + { "inode_table", &set_gd4.bg_inode_table, + &set_gd4.bg_inode_table_hi, 4, parse_uint }, + { "free_blocks_count", &set_gd4.bg_free_blocks_count, + &set_gd4.bg_free_blocks_count_hi, 2, parse_uint }, + { "free_inodes_count", &set_gd4.bg_free_inodes_count, + &set_gd4.bg_free_inodes_count_hi, 2, parse_uint }, + { "used_dirs_count", &set_gd4.bg_used_dirs_count, + &set_gd4.bg_used_dirs_count_hi, 2, parse_uint }, + { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint }, + { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo, + &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint }, + { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo, + &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint }, + { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo, + &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint }, + { "itable_unused", &set_gd4.bg_itable_unused, + &set_gd4.bg_itable_unused_hi, 2, parse_uint }, + { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum }, + { 0, 0, 0, 0 } +}; + +static struct field_set_info mmp_fields[] = { + { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), + parse_mmp_clear, FLAG_ALIAS }, + { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint }, + { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint }, + { "time", &set_mmp.mmp_time, NULL, 8, parse_uint }, + { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename), + parse_string }, + { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname), + parse_string }, + { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint }, + { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint }, + { 0, 0, 0, 0 } +}; +#if __GNUC_PREREQ (4, 6) +#pragma GCC diagnostic pop +#endif + +#ifdef UNITTEST + + +static void do_verify_field_set_info(struct field_set_info *fields, + const void *data, size_t size) +{ + struct field_set_info *ss, *ss2; + const char *begin = (char *)data; + const char *end = begin + size; + + for (ss = fields ; ss->name ; ss++) { + const char *ptr; + + /* Check pointers */ + ptr = ss->ptr; + assert(!ptr || (ptr >= begin && ptr < end)); + ptr = ss->ptr2; + assert(!ptr || (ptr >= begin && ptr < end)); + + /* Check function */ + assert(ss->func); + + for (ss2 = fields ; ss2 != ss ; ss2++) { + /* Check duplicate names */ + assert(strcmp(ss->name, ss2->name)); + + if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS) + continue; + /* Check false aliases, might be copy-n-paste error */ + assert(!ss->ptr || (ss->ptr != ss2->ptr && + ss->ptr != ss2->ptr2)); + assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr && + ss->ptr2 != ss2->ptr2)); + } + } +} + +int main(int argc, char **argv) +{ + do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb)); + do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode)); + do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd)); + do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4)); + do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp)); + return 0; +} + +ext2_filsys current_fs; +ext2_ino_t root, cwd; + +#endif /* UNITTEST */ + +static int check_suffix(const char *field) +{ + int len = strlen(field); + + if (len <= 3) + return 0; + field += len-3; + if (!strcmp(field, "_lo")) + return 1; + if (!strcmp(field, "_hi")) + return 2; + return 0; +} + +static struct field_set_info *find_field(struct field_set_info *fields, + char *field) +{ + struct field_set_info *ss; + const char *prefix; + char *arg, *delim, *idx, *tmp; + int suffix, prefix_len; + + if (fields == super_fields) + prefix = "s_"; + else if (fields == inode_fields) + prefix = "i_"; + else + prefix = "bg_"; + prefix_len = strlen(prefix); + if (strncmp(field, prefix, prefix_len) == 0) + field += prefix_len; + + arg = malloc(strlen(field)+1); + if (!arg) + return NULL; + strcpy(arg, field); + + idx = strchr(arg, '['); + if (idx) { + *idx++ = 0; + delim = idx + strlen(idx) - 1; + if (!*idx || *delim != ']') + idx = 0; + else + *delim = 0; + } + /* + * Can we parse the number? + */ + if (idx) { + array_idx = strtol(idx, &tmp, 0); + if (*tmp) { + *(--idx) = '['; + *delim = ']'; + idx = 0; + } + } + + /* + * If there is a valid _hi or a _lo suffix, strip it off + */ + suffix = check_suffix(arg); + if (suffix > 0) + arg[strlen(arg)-3] = 0; + + for (ss = fields ; ss->name ; ss++) { + if (suffix && ss->ptr2 == 0) + continue; + if (ss->flags & FLAG_ARRAY) { + if (!idx || (strcmp(ss->name, arg) != 0)) + continue; + if (ss->max_idx > 0 && array_idx >= ss->max_idx) + continue; + } else { + if (strcmp(ss->name, arg) != 0) + continue; + } + free(arg); + return ss; + } + free(arg); + return NULL; +} + +/* + * Note: info->size == 6 is special; this means a base size 4 bytes, + * and secondary (high) size of 2 bytes. This is needed for the + * special case of i_blocks_high and i_file_acl_high. + */ +static errcode_t parse_uint(struct field_set_info *info, char *field, + char *arg) +{ + unsigned long long n, num, mask, limit; + int suffix = check_suffix(field); + char *tmp; + void *field1 = info->ptr, *field2 = info->ptr2; + int size = (info->size == 6) ? 4 : info->size; + union { + __u64 *ptr64; + __u32 *ptr32; + __u16 *ptr16; + __u8 *ptr8; + } u; + + if (suffix == 1) + field2 = 0; + if (suffix == 2) { + field1 = field2; + field2 = 0; + } + + u.ptr8 = (__u8 *) field1; + if (info->flags & FLAG_ARRAY) + u.ptr8 += array_idx * info->size; + + errno = 0; + num = STRTOULL(arg, &tmp, 0); + if (*tmp || errno) { + fprintf(stderr, "Couldn't parse '%s' for field %s.\n", + arg, info->name); + return EINVAL; + } + mask = ~0ULL >> ((8 - size) * 8); + limit = ~0ULL >> ((8 - info->size) * 8); + if (field2 && info->size != 6) + limit = ~0ULL >> ((8 - info->size*2) * 8); + + if (num > limit) { + fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n", + arg, info->name, limit); + return EINVAL; + } + n = num & mask; + switch (size) { + case 8: + *u.ptr64 = n; + break; + case 4: + *u.ptr32 = n; + break; + case 2: + *u.ptr16 = n; + break; + case 1: + *u.ptr8 = n; + break; + } + if (!field2) + return 0; + n = (size == 8) ? 0 : (num >> (size*8)); + u.ptr8 = (__u8 *) field2; + if (info->size == 6) + size = 2; + switch (size) { + case 8: + /* Should never get here */ + fprintf(stderr, "64-bit field %s has a second 64-bit field\n" + "defined; BUG?!?\n", info->name); + *u.ptr64 = 0; + break; + case 4: + *u.ptr32 = n; + break; + case 2: + *u.ptr16 = n; + break; + case 1: + *u.ptr8 = n; + break; + } + return 0; +} + +static errcode_t parse_int(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), char *arg) +{ + long num; + char *tmp; + __s32 *ptr32; + __s16 *ptr16; + __s8 *ptr8; + + num = strtol(arg, &tmp, 0); + if (*tmp) { + fprintf(stderr, "Couldn't parse '%s' for field %s.\n", + arg, info->name); + return EINVAL; + } + switch (info->size) { + case 4: + ptr32 = (__s32 *) info->ptr; + *ptr32 = num; + break; + case 2: + ptr16 = (__s16 *) info->ptr; + *ptr16 = num; + break; + case 1: + ptr8 = (__s8 *) info->ptr; + *ptr8 = num; + break; + } + return 0; +} + +static errcode_t parse_string(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), char *arg) +{ + char *cp = (char *) info->ptr; + + if (strlen(arg) >= info->size) { + fprintf(stderr, "Error maximum size for %s is %d.\n", + info->name, info->size); + return EINVAL; + } + strcpy(cp, arg); + return 0; +} + +static errcode_t parse_time(struct field_set_info *info, + char *field, char *arg) +{ + __s64 t; + __u32 t_low, t_high; + __u32 *ptr_low, *ptr_high; + + if (check_suffix(field)) + return parse_uint(info, field, arg); + + ptr_low = (__u32 *) info->ptr; + ptr_high = (__u32 *) info->ptr2; + + t = string_to_time(arg); + + if (t == -1) { + fprintf(stderr, "Couldn't parse '%s' for field %s.\n", + arg, info->name); + return EINVAL; + } + t_low = (__u32) t; + t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK; + *ptr_low = t_low; + if (ptr_high) + *ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high; + return 0; +} + +static errcode_t parse_uuid(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), char *arg) +{ + unsigned char * p = (unsigned char *) info->ptr; + + if ((strcasecmp(arg, "null") == 0) || + (strcasecmp(arg, "clear") == 0)) { + uuid_clear(p); + } else if (strcasecmp(arg, "time") == 0) { + uuid_generate_time(p); + } else if (strcasecmp(arg, "random") == 0) { + uuid_generate(p); + } else if (uuid_parse(arg, p)) { + fprintf(stderr, "Invalid UUID format: %s\n", arg); + return EINVAL; + } + return 0; +} + +static errcode_t parse_hashalg(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), char *arg) +{ + int hashv; + unsigned char *p = (unsigned char *) info->ptr; + + hashv = e2p_string2hash(arg); + if (hashv < 0) { + fprintf(stderr, "Invalid hash algorithm: %s\n", arg); + return EINVAL; + } + *p = hashv; + return 0; +} + +static errcode_t parse_encoding(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), char *arg) +{ + int encoding; + unsigned char *p = (unsigned char *) info->ptr; + + encoding = e2p_str2encoding(arg); + if (encoding < 0) + return parse_uint(info, field, arg); + *p = encoding; + return 0; +} + +static errcode_t parse_bmap(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), char *arg) +{ + blk64_t blk; + errcode_t retval; + char *tmp; + + blk = strtoull(arg, &tmp, 0); + if (*tmp) { + fprintf(stderr, "Couldn't parse '%s' for field %s.\n", + arg, info->name); + return EINVAL; + } + + retval = ext2fs_bmap2(current_fs, set_ino, + (struct ext2_inode *) &set_inode, + NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL, + &blk); + if (retval) { + com_err("set_inode", retval, "while setting block map"); + } + return retval; +} + +static errcode_t parse_gd_csum(struct field_set_info *info, char *field, + char *arg) +{ + __u16 *checksum = info->ptr; + + if (strcmp(arg, "calc") == 0) { + *checksum = ext2fs_group_desc_csum(current_fs, set_bg); + printf("Checksum set to 0x%04x\n", *checksum); + return 0; + } + return parse_uint(info, field, arg); +} + +static errcode_t parse_inode_csum(struct field_set_info *info, char *field, + char *arg) +{ + errcode_t retval = 0; + __u32 crc; + int is_large_inode = 0; + + if (strcmp(arg, "calc") == 0) { + size_t sz = EXT2_INODE_SIZE(current_fs->super); + struct ext2_inode_large *tmp_inode = NULL; + + retval = ext2fs_get_mem(sz, &tmp_inode); + if (retval) + goto out; + + retval = ext2fs_read_inode_full(current_fs, set_ino, + (struct ext2_inode *) tmp_inode, + sz); + if (retval) + goto out; + +#ifdef WORDS_BIGENDIAN + ext2fs_swap_inode_full(current_fs, tmp_inode, + tmp_inode, 1, sz); +#endif + + if (sz > EXT2_GOOD_OLD_INODE_SIZE) + is_large_inode = 1; + + retval = ext2fs_inode_csum_set(current_fs, set_ino, + tmp_inode); + if (retval) + goto out; +#ifdef WORDS_BIGENDIAN + crc = set_inode.i_checksum_lo = + ext2fs_swab16(tmp_inode->i_checksum_lo); + +#else + crc = set_inode.i_checksum_lo = tmp_inode->i_checksum_lo; +#endif + if (is_large_inode && + set_inode.i_extra_isize >= + (offsetof(struct ext2_inode_large, + i_checksum_hi) - + EXT2_GOOD_OLD_INODE_SIZE)) { +#ifdef WORDS_BIGENDIAN + set_inode.i_checksum_lo = + ext2fs_swab16(tmp_inode->i_checksum_lo); +#else + set_inode.i_checksum_hi = tmp_inode->i_checksum_hi; +#endif + crc |= ((__u32)set_inode.i_checksum_hi) << 16; + } + printf("Checksum set to 0x%08x\n", crc); + out: + ext2fs_free_mem(&tmp_inode); + return retval; + } + return parse_uint(info, field, arg); +} + +static void print_possible_fields(struct field_set_info *fields) +{ + struct field_set_info *ss; + const char *type, *cmd; + FILE *f; + char name[40], idx[40]; + + if (fields == super_fields) { + type = "Superblock"; + cmd = "set_super_value"; + } else if (fields == inode_fields) { + type = "Inode"; + cmd = "set_inode"; + } else if (fields == mmp_fields) { + type = "MMP"; + cmd = "set_mmp_value"; + } else { + type = "Block group descriptor"; + cmd = "set_block_group"; + } + f = open_pager(); + + fprintf(f, "%s fields supported by the %s command:\n", type, cmd); + + for (ss = fields ; ss->name ; ss++) { + type = "unknown"; + if (ss->func == parse_string) + type = "string"; + else if (ss->func == parse_int) + type = "integer"; + else if (ss->func == parse_uint) + type = "unsigned integer"; + else if (ss->func == parse_uuid) + type = "UUID"; + else if (ss->func == parse_hashalg) + type = "hash algorithm"; + else if (ss->func == parse_time) + type = "date/time"; + else if (ss->func == parse_bmap) + type = "set physical->logical block map"; + else if (ss->func == parse_gd_csum) + type = "unsigned integer OR \"calc\""; + strcpy(name, ss->name); + if (ss->flags & FLAG_ARRAY) { + if (ss->max_idx > 0) + sprintf(idx, "[%d]", ss->max_idx); + else + strcpy(idx, "[]"); + strcat(name, idx); + } + if (ss->ptr2) + strcat(name, "[_hi|_lo]"); + fprintf(f, "\t%-25s\t%s\n", name, type); + } + close_pager(f); +} + + +void do_set_super(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + const char *usage = "<field> <value>\n" + "\t\"set_super_value -l\" will list the names of " + "superblock fields\n\twhich can be set."; + static struct field_set_info *ss; + + if ((argc == 2) && !strcmp(argv[1], "-l")) { + print_possible_fields(super_fields); + return; + } + + if (common_args_process(argc, argv, 3, 3, "set_super_value", + usage, CHECK_FS_RW)) + return; + + if ((ss = find_field(super_fields, argv[1])) == 0) { + com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); + return; + } + set_sb = *current_fs->super; + if (ss->func(ss, argv[1], argv[2]) == 0) { + *current_fs->super = set_sb; + ext2fs_mark_super_dirty(current_fs); + } +} + +void do_set_inode(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + const char *usage = "<inode> <field> <value>\n" + "\t\"set_inode_field -l\" will list the names of " + "the fields in an ext2 inode\n\twhich can be set."; + static struct field_set_info *ss; + + if ((argc == 2) && !strcmp(argv[1], "-l")) { + print_possible_fields(inode_fields); + return; + } + + if (common_args_process(argc, argv, 4, 4, "set_inode", + usage, CHECK_FS_RW)) + return; + + if ((ss = find_field(inode_fields, argv[2])) == 0) { + com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); + return; + } + + set_ino = string_to_inode(argv[1]); + if (!set_ino) + return; + + if (debugfs_read_inode2(set_ino, + (struct ext2_inode *) &set_inode, argv[1], + sizeof(set_inode), + (ss->flags & FLAG_CSUM) ? + READ_INODE_NOCSUM : 0)) + return; + + if (ss->func(ss, argv[2], argv[3]) == 0) { + debugfs_write_inode2(set_ino, + (struct ext2_inode *) &set_inode, + argv[1], sizeof(set_inode), + (ss->flags & FLAG_CSUM) ? + WRITE_INODE_NOCSUM : 0); + } +} + +void do_set_block_group_descriptor(int argc, char *argv[], + int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + const char *usage = "<bg number> <field> <value>\n" + "\t\"set_block_group -l\" will list the names of " + "the fields in a block group descriptor\n\twhich can be set."; + struct field_set_info *table; + struct field_set_info *ss; + char *end; + void *edit, *target; + int size; + + /* + * Determine whether we are editing an ext2 or ext4 block group + * descriptor. Descriptors larger than ext4_group_desc cannot + * have their fields edited yet, because they do not have any + * names assigned. When that happens, this function needs to + * be updated for the new descriptor struct and fields. + */ + if (current_fs && + EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) { + table = ext4_bg_fields; + edit = &set_gd4; + size = sizeof(set_gd4); + } else { + table = ext2_bg_fields; + edit = &set_gd; + size = sizeof(set_gd); + } + + if ((argc == 2) && !strcmp(argv[1], "-l")) { + print_possible_fields(table); + return; + } + + if (common_args_process(argc, argv, 4, 4, "set_block_group", + usage, CHECK_FS_RW)) + return; + + set_bg = strtoul(argv[1], &end, 0); + if (*end) { + com_err(argv[0], 0, "invalid block group number: %s", argv[1]); + return; + } + + if (set_bg >= current_fs->group_desc_count) { + com_err(argv[0], 0, "block group number too big: %d", set_bg); + return; + } + + if ((ss = find_field(table, argv[2])) == 0) { + com_err(argv[0], 0, "invalid field specifier: %s", argv[2]); + return; + } + + target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg); + memcpy(edit, target, size); + if (ss->func(ss, argv[2], argv[3]) == 0) { + memcpy(target, edit, size); + ext2fs_mark_super_dirty(current_fs); + } +} + +static errcode_t parse_mmp_clear(struct field_set_info *info, + char *field EXT2FS_ATTR((unused)), + char *arg EXT2FS_ATTR((unused))) +{ + errcode_t retval; + + retval = ext2fs_mmp_clear(current_fs); + if (retval != 0) + com_err("set_mmp_value", retval, "while clearing MMP block\n"); + else + memcpy(info->ptr, current_fs->mmp_buf, info->size); + + return 1; /* we don't need the MMP block written again */ +} + +#ifdef CONFIG_MMP +void do_set_mmp_value(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + const char *usage = "<field> <value>\n" + "\t\"set_mmp_value -l\" will list the names of " + "MMP fields\n\twhich can be set."; + static struct field_set_info *smmp; + struct mmp_struct *mmp_s; + errcode_t retval; + + if (argc == 2 && strcmp(argv[1], "-l") == 0) { + print_possible_fields(mmp_fields); + return; + } + + if (check_fs_open(argv[0])) + return; + + if (current_fs->super->s_mmp_block == 0) { + com_err(argv[0], 0, "no MMP block allocated\n"); + return; + } + + if (common_args_process(argc, argv, 2, 3, "set_mmp_value", + usage, CHECK_FS_RW)) + return; + + mmp_s = current_fs->mmp_buf; + if (mmp_s == NULL) { + retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s); + if (retval) { + com_err(argv[0], retval, "allocating MMP buffer\n"); + return; + } + retval = ext2fs_mmp_read(current_fs, + current_fs->super->s_mmp_block, mmp_s); + if (retval) { + com_err(argv[0], retval, "reading MMP block %llu.\n", + (long long)current_fs->super->s_mmp_block); + ext2fs_free_mem(&mmp_s); + return; + } + current_fs->mmp_buf = mmp_s; + } + + smmp = find_field(mmp_fields, argv[1]); + if (smmp == 0) { + com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); + return; + } + + set_mmp = *mmp_s; + if (smmp->func(smmp, argv[1], argv[2]) == 0) { + ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block, + &set_mmp); + *mmp_s = set_mmp; + } +} +#else +void do_set_mmp_value(int argc EXT2FS_ATTR((unused)), + char *argv[] EXT2FS_ATTR((unused)), + int sci_idx EXT2FS_ATTR((unused)), + void *infop EXT2FS_ATTR((unused))) +{ + fprintf(stdout, "MMP is unsupported, please recompile with " + "--enable-mmp\n"); +} +#endif + |