+++ /dev/null
-/*
- * Copyright (C) 1999, 2001 by Andries Brouwer
- * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
- * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
- *
- * This file may be redistributed under the terms of the
- * GNU Lesser General Public License.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <ctype.h>
-#include <stdint.h>
-#ifdef __linux__
-#include <sys/utsname.h>
-#endif
-#include <time.h>
-
-#include "linux_version.h"
-#include "superblocks.h"
-
-struct ext2_super_block {
- uint32_t s_inodes_count;
- uint32_t s_blocks_count;
- uint32_t s_r_blocks_count;
- uint32_t s_free_blocks_count;
- uint32_t s_free_inodes_count;
- uint32_t s_first_data_block;
- uint32_t s_log_block_size;
- uint32_t s_dummy3[7];
- unsigned char s_magic[2];
- uint16_t s_state;
- uint16_t s_errors;
- uint16_t s_minor_rev_level;
- uint32_t s_lastcheck;
- uint32_t s_checkinterval;
- uint32_t s_creator_os;
- uint32_t s_rev_level;
- uint16_t s_def_resuid;
- uint16_t s_def_resgid;
- uint32_t s_first_ino;
- uint16_t s_inode_size;
- uint16_t s_block_group_nr;
- uint32_t s_feature_compat;
- uint32_t s_feature_incompat;
- uint32_t s_feature_ro_compat;
- unsigned char s_uuid[16];
- char s_volume_name[16];
- char s_last_mounted[64];
- uint32_t s_algorithm_usage_bitmap;
- uint8_t s_prealloc_blocks;
- uint8_t s_prealloc_dir_blocks;
- uint16_t s_reserved_gdt_blocks;
- uint8_t s_journal_uuid[16];
- uint32_t s_journal_inum;
- uint32_t s_journal_dev;
- uint32_t s_last_orphan;
- uint32_t s_hash_seed[4];
- uint8_t s_def_hash_version;
- uint8_t s_jnl_backup_type;
- uint16_t s_reserved_word_pad;
- uint32_t s_default_mount_opts;
- uint32_t s_first_meta_bg;
- uint32_t s_mkfs_time;
- uint32_t s_jnl_blocks[17];
- uint32_t s_blocks_count_hi;
- uint32_t s_r_blocks_count_hi;
- uint32_t s_free_blocks_hi;
- uint16_t s_min_extra_isize;
- uint16_t s_want_extra_isize;
- uint32_t s_flags;
- uint16_t s_raid_stride;
- uint16_t s_mmp_interval;
- uint64_t s_mmp_block;
- uint32_t s_raid_stripe_width;
- uint32_t s_reserved[163];
-} __attribute__((packed));
-
-/* magic string */
-#define EXT_SB_MAGIC "\123\357"
-/* supper block offset */
-#define EXT_SB_OFF 0x400
-/* supper block offset in kB */
-#define EXT_SB_KBOFF (EXT_SB_OFF >> 10)
-/* magic string offset within super block */
-#define EXT_MAG_OFF 0x38
-
-
-
-/* for s_flags */
-#define EXT2_FLAGS_TEST_FILESYS 0x0004
-
-/* for s_feature_compat */
-#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
-
-/* for s_feature_ro_compat */
-#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
-#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
-#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
-#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
-#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
-#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
-#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
-
-/* for s_feature_incompat */
-#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
-#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
-#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
-#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
-#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
-#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
-#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
-#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
-
-#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
- EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
- EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
-#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
- EXT2_FEATURE_INCOMPAT_META_BG)
-#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
-#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
-
-#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
- EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
- EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
-#define EXT3_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
- EXT3_FEATURE_INCOMPAT_RECOVER| \
- EXT2_FEATURE_INCOMPAT_META_BG)
-#define EXT3_FEATURE_INCOMPAT_UNSUPPORTED ~EXT3_FEATURE_INCOMPAT_SUPP
-#define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT3_FEATURE_RO_COMPAT_SUPP
-
-/*
- * Check to see if a filesystem is in /proc/filesystems.
- * Returns 1 if found, 0 if not
- */
-static int fs_proc_check(const char *fs_name)
-{
- FILE *f;
- char buf[80], *cp, *t;
-
- f = fopen("/proc/filesystems", "r");
- if (!f)
- return 0;
- while (!feof(f)) {
- if (!fgets(buf, sizeof(buf), f))
- break;
- cp = buf;
- if (!isspace(*cp)) {
- while (*cp && !isspace(*cp))
- cp++;
- }
- while (*cp && isspace(*cp))
- cp++;
- if ((t = strchr(cp, '\n')) != NULL)
- *t = 0;
- if ((t = strchr(cp, '\t')) != NULL)
- *t = 0;
- if ((t = strchr(cp, ' ')) != NULL)
- *t = 0;
- if (!strcmp(fs_name, cp)) {
- fclose(f);
- return 1;
- }
- }
- fclose(f);
- return (0);
-}
-
-/*
- * Check to see if a filesystem is available as a module
- * Returns 1 if found, 0 if not
- */
-static int check_for_modules(const char *fs_name)
-{
-#ifdef __linux__
- struct utsname uts;
- FILE *f;
- char buf[1024], *cp;
- int namesz;
-
- if (uname(&uts))
- return 0;
- snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
-
- f = fopen(buf, "r");
- if (!f)
- return 0;
-
- namesz = strlen(fs_name);
-
- while (!feof(f)) {
- if (!fgets(buf, sizeof(buf), f))
- break;
- if ((cp = strchr(buf, ':')) != NULL)
- *cp = 0;
- else
- continue;
- if ((cp = strrchr(buf, '/')) == NULL)
- continue;
- cp++;
-
- if (!strncmp(cp, fs_name, namesz) &&
- (!strcmp(cp + namesz, ".ko") ||
- !strcmp(cp + namesz, ".ko.gz"))) {
- fclose(f);
- return 1;
- }
- }
- fclose(f);
-#endif /* __linux__ */
- return 0;
-}
-
-/*
- * Starting in 2.6.29, ext4 can be used to support filesystems
- * without a journal.
- */
-#define EXT4_SUPPORTS_EXT2 KERNEL_VERSION(2, 6, 29)
-
-static int system_supports_ext2(void)
-{
- static time_t last_check = 0;
- static int ret = -1;
- time_t now = time(0);
-
- if (ret != -1 || (now - last_check) < 5)
- return ret;
- last_check = now;
- ret = (fs_proc_check("ext2") || check_for_modules("ext2"));
- return ret;
-}
-
-static int system_supports_ext4(void)
-{
- static time_t last_check = 0;
- static int ret = -1;
- time_t now = time(0);
-
- if (ret != -1 || (now - last_check) < 5)
- return ret;
- last_check = now;
- ret = (fs_proc_check("ext4") || check_for_modules("ext4"));
- return ret;
-}
-
-static int system_supports_ext4dev(void)
-{
- static time_t last_check = 0;
- static int ret = -1;
- time_t now = time(0);
-
- if (ret != -1 || (now - last_check) < 5)
- return ret;
- last_check = now;
- ret = (fs_proc_check("ext4dev") || check_for_modules("ext4dev"));
- return ret;
-}
-/*
- * reads superblock and returns:
- * fc = feature_compat
- * fi = feature_incompat
- * frc = feature_ro_compat
- */
-static struct ext2_super_block *ext_get_super(
- blkid_probe pr, uint32_t *fc, uint32_t *fi, uint32_t *frc)
-{
- struct ext2_super_block *es;
-
- es = (struct ext2_super_block *)
- blkid_probe_get_buffer(pr, EXT_SB_OFF, 0x200);
- if (!es)
- return NULL;
- if (fc)
- *fc = le32_to_cpu(es->s_feature_compat);
- if (fi)
- *fi = le32_to_cpu(es->s_feature_incompat);
- if (frc)
- *frc = le32_to_cpu(es->s_feature_ro_compat);
-
- return es;
-}
-
-static void ext_get_info(blkid_probe pr, int ver, struct ext2_super_block *es)
-{
- //struct blkid_chain *chn = blkid_probe_get_chain(pr);
-
- DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
- le32_to_cpu(es->s_feature_compat),
- le32_to_cpu(es->s_feature_incompat),
- le32_to_cpu(es->s_feature_ro_compat)));
-
- if (strlen(es->s_volume_name))
- blkid_probe_set_label(pr, (unsigned char *) es->s_volume_name,
- sizeof(es->s_volume_name));
- blkid_probe_set_uuid(pr, es->s_uuid);
-
- if (le32_to_cpu(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL)
- blkid_probe_set_uuid_as(pr, es->s_journal_uuid, "EXT_JOURNAL");
-
-/* if (ver != 2 && (chn->flags & BLKID_SUBLKS_SECTYPE) &&
- ((le32_to_cpu(es->s_feature_incompat) & EXT2_FEATURE_INCOMPAT_UNSUPPORTED) == 0))
- blkid_probe_set_value(pr, "SEC_TYPE",
- (unsigned char *) "ext2",
- sizeof("ext2"));*/
-
- blkid_probe_sprintf_version(pr, "%u.%u",
- le32_to_cpu(es->s_rev_level),
- le16_to_cpu(es->s_minor_rev_level));
-}
-
-
-static int probe_jbd(blkid_probe pr,
- const struct blkid_idmag *mag __attribute__((__unused__)))
-{
- struct ext2_super_block *es;
- uint32_t fi;
-
- es = ext_get_super(pr, NULL, &fi, NULL);
- if (!es)
- return -BLKID_ERR_PARAM;
- if (!(fi & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
- return -BLKID_ERR_PARAM;
-
- ext_get_info(pr, 2, es);
- return 0;
-}
-
-static int probe_ext2(blkid_probe pr,
- const struct blkid_idmag *mag __attribute__((__unused__)))
-{
- struct ext2_super_block *es;
- uint32_t fc, frc, fi;
-
- es = ext_get_super(pr, &fc, &fi, &frc);
- if (!es)
- return -BLKID_ERR_PARAM;
-
- /* Distinguish between ext3 and ext2 */
- if (fc & EXT3_FEATURE_COMPAT_HAS_JOURNAL)
- return -BLKID_ERR_PARAM;
-
- /* Any features which ext2 doesn't understand */
- if ((frc & EXT2_FEATURE_RO_COMPAT_UNSUPPORTED) ||
- (fi & EXT2_FEATURE_INCOMPAT_UNSUPPORTED))
- return -BLKID_ERR_PARAM;
-
- /*
- * If ext2 is not present, but ext4 or ext4dev are, then
- * disclaim we are ext2
- */
- if (!system_supports_ext2() &&
- (system_supports_ext4() || system_supports_ext4dev()) &&
- get_linux_version() >= EXT4_SUPPORTS_EXT2)
- return -BLKID_ERR_PARAM;
-
- ext_get_info(pr, 2, es);
- return 0;
-}
-
-static int probe_ext3(blkid_probe pr,
- const struct blkid_idmag *mag __attribute__((__unused__)))
-{
- struct ext2_super_block *es;
- uint32_t fc, frc, fi;
-
- es = ext_get_super(pr, &fc, &fi, &frc);
- if (!es)
- return -BLKID_ERR_PARAM;
-
- /* ext3 requires journal */
- if (!(fc & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
- return -BLKID_ERR_PARAM;
-
- /* Any features which ext3 doesn't understand */
- if ((frc & EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) ||
- (fi & EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
- return -BLKID_ERR_PARAM;
-
- ext_get_info(pr, 3, es);
- return 0;
-}
-
-
-static int probe_ext4dev(blkid_probe pr,
- const struct blkid_idmag *mag __attribute__((__unused__)))
-{
- struct ext2_super_block *es;
- uint32_t fc, frc, fi;
-
- es = ext_get_super(pr, &fc, &fi, &frc);
- if (!es)
- return -BLKID_ERR_PARAM;
-
- /* Distinguish from jbd */
- if (fi & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
- return -BLKID_ERR_PARAM;
-
- /*
- * If the filesystem does not have a journal and ext2 and ext4
- * is not present, then force this to be detected as an
- * ext4dev filesystem.
- */
- if (!(fc & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
- !system_supports_ext2() && !system_supports_ext4() &&
- system_supports_ext4dev() &&
- get_linux_version() >= EXT4_SUPPORTS_EXT2)
- goto force_ext4dev;
-
- /*
- * If the filesystem is marked as OK for use by in-development
- * filesystem code, but ext4dev is not supported, and ext4 is,
- * then don't call ourselves ext4dev, since we should be
- * detected as ext4 in that case.
- *
- * If the filesystem is marked as in use by production
- * filesystem, then it can only be used by ext4 and NOT by
- * ext4dev, so always disclaim we are ext4dev in that case.
- */
- if (le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
- if (!system_supports_ext4dev() && system_supports_ext4())
- return -BLKID_ERR_PARAM;
- } else
- return -BLKID_ERR_PARAM;
-
-force_ext4dev:
- ext_get_info(pr, 4, es);
- return 0;
-}
-
-static int probe_ext4(blkid_probe pr,
- const struct blkid_idmag *mag __attribute__((__unused__)))
-{
- struct ext2_super_block *es;
- uint32_t fc, frc, fi;
-
- es = ext_get_super(pr, &fc, &fi, &frc);
- if (!es)
- return -1;
-
- /* Distinguish from jbd */
- if (fi & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
- return -BLKID_ERR_PARAM;
-
- /*
- * If the filesystem does not have a journal and ext2 is not
- * present, then force this to be detected as an ext2
- * filesystem.
- */
- if (!(fc & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
- !system_supports_ext2() && system_supports_ext4() &&
- get_linux_version() >= EXT4_SUPPORTS_EXT2)
- goto force_ext4;
-
- /* Ext4 has at least one feature which ext3 doesn't understand */
- if (!(frc & EXT3_FEATURE_RO_COMPAT_UNSUPPORTED) &&
- !(fi & EXT3_FEATURE_INCOMPAT_UNSUPPORTED))
- return -BLKID_ERR_PARAM;
-
-force_ext4:
- /*
- * If the filesystem is a OK for use by in-development
- * filesystem code, and ext4dev is supported or ext4 is not
- * supported, then don't call ourselves ext4, so we can redo
- * the detection and mark the filesystem as ext4dev.
- *
- * If the filesystem is marked as in use by production
- * filesystem, then it can only be used by ext4 and NOT by
- * ext4dev.
- */
- if (le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS) {
- if (system_supports_ext4dev() || !system_supports_ext4())
- return -BLKID_ERR_PARAM;
- }
-
- ext_get_info(pr, 4, es);
- return 0;
-}
-
-#define BLKID_EXT_MAGICS \
- { \
- { \
- .magic = EXT_SB_MAGIC, \
- .len = sizeof(EXT_SB_MAGIC) - 1, \
- .kboff = EXT_SB_KBOFF, \
- .sboff = EXT_MAG_OFF \
- }, \
- { NULL } \
- }
-
-const struct blkid_idinfo jbd_idinfo =
-{
- .name = "jbd",
- .usage = BLKID_USAGE_OTHER,
- .probefunc = probe_jbd,
- .magics = BLKID_EXT_MAGICS
-};
-
-const struct blkid_idinfo ext2_idinfo =
-{
- .name = "ext2",
- .usage = BLKID_USAGE_FILESYSTEM,
- .probefunc = probe_ext2,
- .magics = BLKID_EXT_MAGICS
-};
-
-const struct blkid_idinfo ext3_idinfo =
-{
- .name = "ext3",
- .usage = BLKID_USAGE_FILESYSTEM,
- .probefunc = probe_ext3,
- .magics = BLKID_EXT_MAGICS
-};
-
-const struct blkid_idinfo ext4_idinfo =
-{
- .name = "ext4",
- .usage = BLKID_USAGE_FILESYSTEM,
- .probefunc = probe_ext4,
- .magics = BLKID_EXT_MAGICS
-};
-
-const struct blkid_idinfo ext4dev_idinfo =
-{
- .name = "ext4dev",
- .usage = BLKID_USAGE_FILESYSTEM,
- .probefunc = probe_ext4dev,
- .magics = BLKID_EXT_MAGICS
-};
-
projects / project / ubox.git / blobdiff