mirror of https://github.com/vitalif/e2fsprogs
839 lines
24 KiB
C
839 lines
24 KiB
C
/*
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* probe.c - identify a block device by its contents, and return a dev
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* struct with the details
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*
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* Copyright (C) 1999 by Andries Brouwer
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* Copyright (C) 1999, 2000 by Theodore Ts'o
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* Copyright (C) 2001 by Andreas Dilger
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_SYS_MKDEV_H
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#include <sys/mkdev.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include "blkid/blkid.h"
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#include "uuid/uuid.h"
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#include "probe.h"
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/* #define DEBUG_PROBE */
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#ifdef DEBUG_PROBE
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#define DEB_PROBE(fmt, arg...) printf("probe: " fmt, ## arg)
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#else
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#define DEB_PROBE(fmt, arg...) do {} while (0)
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#endif
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/*
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* Do the required things for instantiating a new device. This is called if
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* there is nor a probe handler for a filesystem type, and is also called by
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* the filesystem-specific types to do common initialization tasks.
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*
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* The devname, dev_p, and id fields are required. The buf is
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* a buffer to return superblock data in.
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*/
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static int probe_default(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_loff_t offset;
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blkid_dev *dev;
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struct stat st;
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int ret;
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if (!devname || !dev_p || !id || !buf || fd < 0)
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return -BLKID_ERR_PARAM;
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if (fstat(fd, &st) < 0 || !S_ISBLK(st.st_mode))
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return -BLKID_ERR_DEV;
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offset = (blkid_loff_t)id->bim_kboff << 10;
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if (id->bim_kboff < 0)
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offset = (size & ~((blkid_loff_t)id->bim_align - 1)) + offset;
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if (blkid_llseek(fd, offset, 0) < 0 ||
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read(fd, buf, id->bim_kbsize << 10) != id->bim_kbsize << 10)
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return -BLKID_ERR_IO;
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/* Revalidate magic for blkid_validate_devname */
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if (memcmp(id->bim_magic, buf + id->bim_sboff, id->bim_len))
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return -BLKID_ERR_PARAM;
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dev = blkid_new_dev();
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if (!dev)
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return -BLKID_ERR_MEM;
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dev->bid_name = string_copy(devname);
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if (!dev->bid_name) {
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ret = -BLKID_ERR_MEM;
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goto exit_dev;
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}
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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dev->bid_devno = st.st_rdev;
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dev->bid_devsize = size;
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dev->bid_time = time(0);
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dev->bid_flags |= BLKID_BID_FL_VERIFIED;
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if (id->bim_type)
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blkid_create_tag(dev, NULL, "TYPE", id->bim_type,
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strlen(id->bim_type));
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DEB_PROBE("%s: devno 0x%04Lx, type %s\n", devname,
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st.st_rdev, id->bim_type);
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return 0;
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exit_dev:
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blkid_free_dev(dev);
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return ret;
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}
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static int probe_ext2(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct ext2_super_block *es;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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es = (struct ext2_super_block *)buf;
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DEB_PROBE("size = %Ld, ext2_sb.compat = %08X:%08X:%08X\n", size,
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le32_to_cpu(es->s_feature_compat),
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le32_to_cpu(es->s_feature_incompat),
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le32_to_cpu(es->s_feature_ro_compat));
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/* Make sure we don't keep re-probing as ext2 for a journaled fs */
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if (!strcmp(id->bim_type, "ext2") &&
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(le32_to_cpu(es->s_feature_compat) &
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EXT3_FEATURE_COMPAT_HAS_JOURNAL ||
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le32_to_cpu(es->s_feature_incompat) &
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EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
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blkid_free_dev(dev);
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return -BLKID_ERR_PARAM;
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}
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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dev->bid_size = (blkid_loff_t)le32_to_cpu(es->s_blocks_count) <<
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(le32_to_cpu(es->s_log_block_size) + 10);
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/* This is a safe (minimum) number, as it ignores metadata usage. */
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dev->bid_free = (blkid_loff_t)le32_to_cpu(es->s_free_blocks_count) <<
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(le32_to_cpu(es->s_log_block_size) + 10);
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if (strlen(es->s_volume_name)) {
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blkid_create_tag(dev, NULL, "LABEL", es->s_volume_name,
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sizeof(es->s_volume_name));
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}
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if (!uuid_is_null(es->s_uuid)) {
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unsigned char uuid[37];
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uuid_unparse(es->s_uuid, uuid);
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blkid_create_tag(dev, NULL, "UUID", uuid, sizeof(uuid));
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}
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return 0;
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}
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static int probe_jbd(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct ext2_super_block *es;
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int ret;
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if ((ret = probe_ext2(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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es = (struct ext2_super_block *)buf;
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if (!(le32_to_cpu(es->s_feature_incompat) &
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EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
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blkid_free_dev(dev);
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return -BLKID_ERR_PARAM;
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}
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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return 0;
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}
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static int probe_ext3(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct ext2_super_block *es;
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int ret;
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if ((ret = probe_ext2(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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es = (struct ext2_super_block *)buf;
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if (!(le32_to_cpu(es->s_feature_compat) &
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EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
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blkid_free_dev(dev);
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*dev_p = NULL;
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return -BLKID_ERR_PARAM;
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}
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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if (!(le32_to_cpu(es->s_feature_incompat) &
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EXT3_FEATURE_INCOMPAT_RECOVER)) {
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blkid_create_tag(dev, NULL, "TYPE", "ext2", 4);
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dev->bid_flags |= BLKID_BID_FL_MTYPE;
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}
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return 0;
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}
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static int probe_vfat(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct vfat_super_block *vs;
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char serno[10];
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blkid_loff_t sectors;
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int cluster_size;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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vs = (struct vfat_super_block *)buf;
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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sectors = ((vs->vs_sectors[1] << 8) | vs->vs_sectors[0]);
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if (sectors == 0)
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sectors = vs->vs_total_sect;
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cluster_size = ((vs->vs_sector_size[1] << 8) | vs->vs_sector_size[0]);
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dev->bid_size = sectors * cluster_size;
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DEB_PROBE("%Ld %d byte sectors\n", sectors, cluster_size);
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if (strncmp(vs->vs_label, "NO NAME", 7)) {
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unsigned char *end = vs->vs_label + sizeof(vs->vs_label) - 1;
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while (*end == ' ' && end >= vs->vs_label)
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--end;
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if (end >= vs->vs_label)
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blkid_create_tag(dev, NULL, "LABEL", vs->vs_label,
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end - vs->vs_label + 1);
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}
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/* We can't just print them as %04X, because they are unaligned */
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sprintf(serno, "%02X%02X-%02X%02X", vs->vs_serno[3], vs->vs_serno[2],
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vs->vs_serno[1], vs->vs_serno[0]);
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blkid_create_tag(dev, NULL, "UUID", serno, sizeof(serno));
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return 0;
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}
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static int probe_msdos(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct msdos_super_block *ms;
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char serno[10];
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int cluster_size;
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blkid_loff_t sectors;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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ms = (struct msdos_super_block *)buf;
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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sectors = ((ms->ms_sectors[1] << 8) | ms->ms_sectors[0]);
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if (sectors == 0)
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sectors = ms->ms_total_sect;
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cluster_size = ((ms->ms_sector_size[1] << 8) | ms->ms_sector_size[0]);
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dev->bid_size = sectors * cluster_size;
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DEB_PROBE("%Ld %d byte sectors\n", sectors, cluster_size);
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if (strncmp(ms->ms_label, "NO NAME", 7)) {
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unsigned char *end = ms->ms_label + sizeof(ms->ms_label) - 1;
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while (*end == ' ' && end >= ms->ms_label)
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--end;
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if (end >= ms->ms_label)
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blkid_create_tag(dev, NULL, "LABEL", ms->ms_label,
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end - ms->ms_label + 1);
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}
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/* We can't just print them as %04X, because they are unaligned */
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sprintf(serno, "%02X%02X-%02X%02X", ms->ms_serno[3], ms->ms_serno[2],
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ms->ms_serno[1], ms->ms_serno[0]);
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blkid_create_tag(dev, NULL, "UUID", serno, sizeof(serno));
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return 0;
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}
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static int probe_xfs(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct xfs_super_block *xs;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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xs = (struct xfs_super_block *)buf;
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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/* If the filesystem size is larger than the device, this is bad */
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dev->bid_size = be64_to_cpu(xs->xs_dblocks) *
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be32_to_cpu(xs->xs_blocksize);
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dev->bid_free = be64_to_cpu(xs->xs_fdblocks) *
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be32_to_cpu(xs->xs_blocksize);
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if (strlen(xs->xs_fname))
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blkid_create_tag(dev, NULL, "LABEL", xs->xs_fname,
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sizeof(xs->xs_fname));
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if (!uuid_is_null(xs->xs_uuid)) {
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char uuid[37];
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uuid_unparse(xs->xs_uuid, uuid);
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blkid_create_tag(dev, NULL, "UUID", uuid, sizeof(uuid));
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}
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return 0;
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}
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static int probe_reiserfs(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct reiserfs_super_block *rs;
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unsigned int blocksize;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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rs = (struct reiserfs_super_block *)buf;
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blocksize = le16_to_cpu(rs->rs_blocksize);
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/* If the superblock is inside the journal, we have the wrong one */
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if (id->bim_kboff/(blocksize>>10) > le32_to_cpu(rs->rs_journal_block)) {
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blkid_free_dev(dev);
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return -BLKID_ERR_BIG;
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}
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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/* If the filesystem size is larger than the device, this is bad */
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dev->bid_size = le32_to_cpu(rs->rs_blocks_count) * blocksize;
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dev->bid_free = le32_to_cpu(rs->rs_free_blocks) * blocksize;
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/* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
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if (!strcmp(id->bim_magic, "ReIsEr2Fs") ||
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!strcmp(id->bim_magic, "ReIsEr3Fs")) {
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if (strlen(rs->rs_label)) {
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blkid_create_tag(dev, NULL, "LABEL", rs->rs_label,
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sizeof(rs->rs_label));
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}
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if (!uuid_is_null(rs->rs_uuid)) {
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unsigned char uuid[37];
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uuid_unparse(rs->rs_uuid, uuid);
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blkid_create_tag(dev, NULL, "UUID", uuid, sizeof(uuid));
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}
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}
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return 0;
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}
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static int probe_minix(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct minix_super_block *ms;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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ms = (struct minix_super_block *)buf;
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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dev->bid_size = ms->ms_nzones << ms->ms_log_zone_size;
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return 0;
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}
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static int probe_swap(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct swap_header *sh;
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int psize;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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/* PAGE_SIZE can be found by where the magic is located */
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psize = (id->bim_kboff << 10) + (id->bim_sboff + 10);
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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sh = (struct swap_header *)buf;
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/* Is swap data in local endian format? */
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dev->bid_size = (blkid_loff_t)(sh->sh_last_page + 1) * psize;
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/* A label can not exist on the old (128MB max) swap format */
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if (!strcmp(id->bim_magic, "SWAPSPACE2") && sh->sh_label[0]) {
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blkid_create_tag(dev, NULL, "LABEL", sh->sh_label,
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sizeof(sh->sh_label));
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}
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return 0;
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}
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static int probe_mdraid(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct mdp_superblock_s *md;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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/* Don't set this until there is no chance of error */
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*dev_p = dev;
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md = (struct mdp_superblock_s *)buf;
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/* What units is md->size in? Assume 512-byte sectors? */
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dev->bid_size = md->size * 512;
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/* The MD UUID is not contiguous in the superblock, make it so */
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if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
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unsigned char md_uuid[16];
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unsigned char uuid[37];
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memcpy(md_uuid, &md->set_uuid0, 4);
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memcpy(md_uuid + 4, &md->set_uuid1, 12);
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uuid_unparse(md_uuid, uuid);
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blkid_create_tag(dev, NULL, "UUID", uuid, sizeof(uuid));
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}
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return 0;
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}
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static int probe_hfs(int fd, blkid_dev **dev_p, const char *devname,
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struct blkid_magic *id, unsigned char *buf,
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blkid_loff_t size)
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{
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blkid_dev *dev;
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struct hfs_super_block *hfs;
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int ret;
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if ((ret = probe_default(fd, &dev, devname, id, buf, size)) < 0)
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return ret;
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hfs = (struct hfs_super_block *)buf;
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if (be32_to_cpu(hfs->h_blksize) != 512)
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return -BLKID_ERR_PARAM;
|
|
|
|
/* Don't set this until there is no chance of error */
|
|
*dev_p = dev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined
|
|
* in the type_array table below + bim_kbalign. If we ever start looking for magics
|
|
* relative to the end of a device, we can start using negative offsets
|
|
* in type_array.
|
|
*/
|
|
#define BLKID_BLK_BITS (10)
|
|
#define BLKID_BLK_KBITS (BLKID_BLK_BITS - 10)
|
|
#define BLKID_BLK_SIZE (1024 << BLKID_BLK_KBITS)
|
|
#define BLKID_BLK_MASK (BLKID_BLK_SIZE - 1)
|
|
#define BLKID_BLK_OFFS 128 /* currently MDRAID kboff + align */
|
|
|
|
/*
|
|
* Various filesystem magics that we can check for. Note that kboff and
|
|
* sboff are in kilobytes and bytes respectively. All magics are in
|
|
* byte strings so we don't worry about endian issues.
|
|
*/
|
|
struct blkid_magic type_array[] = {
|
|
/* type kboff sboff len magic align kbsize probe */
|
|
{ "MDRAID", -64, 0, 4, "\251+N\374", 65536, 4, probe_mdraid },
|
|
/*{ "LVM", 0, 0, 4, "HM\001\000", 1, 4, probe_lvm },*/
|
|
{ "jbd", 1, 0x38, 2, "\123\357", 1, 1, probe_jbd },
|
|
{ "ext3", 1, 0x38, 2, "\123\357", 1, 1, probe_ext3 },
|
|
{ "ext2", 1, 0x38, 2, "\123\357", 1, 1, probe_ext2 },
|
|
{ "reiserfs", 8, 0x34, 8, "ReIsErFs", 1, 1, probe_reiserfs },
|
|
{ "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", 1, 1, probe_reiserfs },
|
|
{ "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", 1, 1, probe_reiserfs },
|
|
{ "reiserfs", 64, 0x34, 8, "ReIsErFs", 1, 1, probe_reiserfs },
|
|
{ "reiserfs", 8, 20, 8, "ReIsErFs", 1, 1, probe_reiserfs },
|
|
{ "ntfs", 0, 3, 8, "NTFS ", 1, 1, probe_default },
|
|
{ "vfat", 0, 0x52, 5, "MSWIN", 1, 1, probe_vfat },
|
|
{ "vfat", 0, 0x52, 8, "FAT32 ", 1, 1, probe_vfat },
|
|
{ "msdos", 0, 0x36, 5, "MSDOS", 1, 1, probe_msdos },
|
|
{ "msdos", 0, 0x36, 8, "FAT16 ", 1, 1, probe_msdos },
|
|
{ "msdos", 0, 0x36, 8, "FAT12 ", 1, 1, probe_msdos },
|
|
{ "minix", 1, 0x10, 2, "\177\023", 1, 1, probe_minix },
|
|
{ "minix", 1, 0x10, 2, "\217\023", 1, 1, probe_minix },
|
|
{ "minix", 1, 0x10, 2, "\150\044", 1, 1, probe_minix },
|
|
{ "minix", 1, 0x10, 2, "\170\044", 1, 1, probe_minix },
|
|
{ "vxfs", 1, 0, 4, "\365\374\001\245", 1, 1, probe_default },
|
|
{ "xfs", 0, 0, 4, "XFSB", 1, 1, probe_xfs },
|
|
{ "romfs", 0, 0, 8, "-rom1fs-", 1, 1, probe_default },
|
|
{ "bfs", 0, 0, 4, "\316\372\173\033", 1, 1, probe_default },
|
|
{ "cramfs", 0, 0, 4, "E=\315\034", 1, 1, probe_default },
|
|
{ "qnx4", 0, 4, 6, "QNX4FS", 1, 1, probe_default },
|
|
{ "iso9660", 32, 1, 5, "CD001", 1, 1, probe_default },
|
|
{ "iso9660", 32, 9, 5, "CDROM", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "BEA01", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "BOOT2", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "CD001", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "CDW02", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "NSR02", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "NSR03", 1, 1, probe_default },
|
|
{ "udf", 32, 1, 5, "TEA01", 1, 1, probe_default },
|
|
{ "jfs", 32, 0, 4, "JFS1", 1, 1, probe_default },
|
|
{ "hfs", 1, 0, 2, "BD", 1, 1, probe_hfs },
|
|
{ "ufs", 8, 0x55c, 4, "T\031\001\000", 1, 1, probe_default },
|
|
{ "hpfs", 8, 0, 4, "I\350\225\371", 1, 1, probe_default },
|
|
{ "sysv", 0, 0x3f8, 4, "\020~\030\375", 1, 1, probe_default },
|
|
{ "swap", 0, 0xff6, 10, "SWAP-SPACE", 1, 4, probe_swap },
|
|
{ "swap", 0, 0xff6, 10, "SWAPSPACE2", 1, 4, probe_swap },
|
|
{ "swap", 0, 0x1ff6, 10, "SWAP-SPACE", 1, 8, probe_swap },
|
|
{ "swap", 0, 0x1ff6, 10, "SWAPSPACE2", 1, 8, probe_swap },
|
|
{ "swap", 0, 0x3ff6, 10, "SWAP-SPACE", 1, 16, probe_swap },
|
|
{ "swap", 0, 0x3ff6, 10, "SWAPSPACE2", 1, 16, probe_swap },
|
|
{ NULL, 0, 0, 0, NULL, 1, 0, NULL }
|
|
};
|
|
|
|
|
|
/*
|
|
* When probing for a lot of magics, we handle everything in 1kB buffers so
|
|
* that we don't have to worry about reading each combination of block sizes.
|
|
*/
|
|
static unsigned char *read_one_buf(int fd, blkid_loff_t offset)
|
|
{
|
|
char *buf;
|
|
|
|
if (lseek(fd, offset, SEEK_SET) < 0)
|
|
return NULL;
|
|
|
|
if (!(buf = (unsigned char *)malloc(BLKID_BLK_SIZE)))
|
|
return NULL;
|
|
|
|
if (read(fd, buf, BLKID_BLK_SIZE) != BLKID_BLK_SIZE) {
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static unsigned char *read_sb_buf(int fd, unsigned char **bufs, int kboff,
|
|
blkid_loff_t start)
|
|
{
|
|
int index = kboff >> BLKID_BLK_KBITS;
|
|
unsigned char **buf;
|
|
|
|
if (index > BLKID_BLK_OFFS || index < -BLKID_BLK_OFFS) {
|
|
fprintf(stderr, "reading from invalid offset %d (%d)!\n",
|
|
kboff, index);
|
|
return NULL;
|
|
}
|
|
|
|
buf = bufs + index;
|
|
if (!*buf)
|
|
*buf = read_one_buf(fd, start);
|
|
|
|
return *buf;
|
|
}
|
|
|
|
static struct blkid_magic *devname_to_magic(const char *devname, int fd,
|
|
unsigned char **bufs,
|
|
struct blkid_magic *id,
|
|
blkid_loff_t size)
|
|
{
|
|
struct blkid_magic *ret = NULL;
|
|
|
|
if (!bufs || fd < 0)
|
|
return NULL;
|
|
|
|
if (id >= type_array + sizeof(type_array) / sizeof(*id))
|
|
return NULL;
|
|
|
|
for (id = id < type_array ? type_array : id + 1; id->bim_type; ++id) {
|
|
unsigned char *buf;
|
|
blkid_loff_t start = 0LL;
|
|
blkid_loff_t offset = 0LL;
|
|
int kboff;
|
|
|
|
offset = ((blkid_loff_t)id->bim_kboff << 10) +
|
|
(id->bim_sboff & ~0x3ffULL);
|
|
/*
|
|
* We index negative buffers by their actual offset (including
|
|
* superblock offsets > 1kB, not the aligned offset, so that
|
|
* we correctly access negative buffers with different
|
|
* alignment requirements.
|
|
*/
|
|
if (id->bim_kboff < 0) {
|
|
start = (size & ~((blkid_loff_t)id->bim_align - 1)) +
|
|
offset;
|
|
if (start < 0) /* Device too small for alignment */
|
|
continue;
|
|
kboff = (start - size) >> 10;
|
|
} else {
|
|
start = offset;
|
|
kboff = offset >> 10;
|
|
}
|
|
|
|
if ((buf =
|
|
read_sb_buf(fd, bufs, kboff, start)) &&
|
|
!memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ffULL),
|
|
id->bim_len)) {
|
|
ret = id;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Get data from a single block special device.
|
|
*
|
|
* Return a blkid_dev with at least the device type and size set.
|
|
* If the passed-in size is zero, then we get the device size here.
|
|
*/
|
|
blkid_dev *blkid_devname_to_dev(const char *devname, blkid_loff_t size)
|
|
{
|
|
unsigned char *buf_array[BLKID_BLK_OFFS * 2 + 1];
|
|
unsigned char **bufs = buf_array + BLKID_BLK_OFFS;
|
|
blkid_dev *dev = NULL, *last = NULL;
|
|
unsigned char *sb_buf = NULL;
|
|
int sb_size = 0;
|
|
struct blkid_magic *id = NULL;
|
|
blkid_loff_t diff_last = 0xf000000000000000ULL;
|
|
int fd;
|
|
|
|
if (!devname)
|
|
return NULL;
|
|
|
|
fd = open(devname, O_RDONLY);
|
|
if (fd < 0)
|
|
return NULL;
|
|
|
|
if (!size)
|
|
size = blkid_get_dev_size(fd);
|
|
if (size < 1024)
|
|
goto exit_fd;
|
|
|
|
memset(buf_array, 0, sizeof(buf_array));
|
|
|
|
while ((id = devname_to_magic(devname, fd, bufs, id, size)) &&
|
|
diff_last) {
|
|
int new_sb;
|
|
blkid_loff_t diff_dev;
|
|
|
|
DEB_PROBE("found type %s (#%d) on %s, probing\n",
|
|
id->bim_type, id - type_array, devname);
|
|
|
|
new_sb = id->bim_kbsize << 10;
|
|
if (sb_size < new_sb) {
|
|
unsigned char *sav = sb_buf;
|
|
if (!(sb_buf = realloc(sb_buf, new_sb))) {
|
|
sb_buf = sav;
|
|
continue;
|
|
}
|
|
sb_size = new_sb;
|
|
}
|
|
|
|
if (id->bim_probe(fd, &dev, devname, id, sb_buf, size) < 0)
|
|
continue;
|
|
|
|
diff_dev = size - dev->bid_size;
|
|
DEB_PROBE("size = %Lu, fs size = %Lu\n", size, dev->bid_size);
|
|
DEB_PROBE("checking best match: old %Ld, new %Ld\n",
|
|
diff_last, diff_dev);
|
|
/* See which type is a better match by checking size */
|
|
if ((diff_last < 0 && diff_dev > diff_last) ||
|
|
(diff_last > 0 && diff_dev >= 0 && diff_dev < diff_last)) {
|
|
if (last)
|
|
blkid_free_dev(last);
|
|
last = dev;
|
|
diff_last = diff_dev;
|
|
} else
|
|
blkid_free_dev(dev);
|
|
}
|
|
|
|
if (!last)
|
|
DEB_PROBE("unknown device type on %s\n", devname);
|
|
else
|
|
DEB_DUMP_DEV(last);
|
|
|
|
/* Free up any buffers we allocated */
|
|
for (bufs = buf_array; bufs - buf_array < sizeof(buf_array) /
|
|
sizeof(buf_array[0]); bufs++) {
|
|
if (*bufs)
|
|
free(*bufs);
|
|
}
|
|
|
|
if (sb_buf)
|
|
free(sb_buf);
|
|
exit_fd:
|
|
close(fd);
|
|
return last;
|
|
}
|
|
|
|
/*
|
|
* Verify that the data in dev is consistent with what is on the actual
|
|
* block device (using the devname field only). Normally this will be
|
|
* called when finding items in the cache, but for long running processes
|
|
* is also desirable to revalidate an item before use.
|
|
*
|
|
* If we are unable to revalidate the data, we return the old data and
|
|
* do not set the BLKID_BID_FL_VERIFIED flag on it.
|
|
*/
|
|
blkid_dev *blkid_verify_devname(blkid_cache *cache, blkid_dev *dev)
|
|
{
|
|
blkid_loff_t size;
|
|
struct blkid_magic *id;
|
|
blkid_dev *new = NULL;
|
|
char *sb_buf = NULL;
|
|
int sb_size = 0;
|
|
time_t diff;
|
|
int fd;
|
|
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
diff = time(0) - dev->bid_time;
|
|
|
|
if (diff < BLKID_PROBE_MIN || (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
|
|
diff < BLKID_PROBE_INTERVAL))
|
|
return dev;
|
|
|
|
DEB_PROBE("need to revalidate %s\n", dev->bid_name);
|
|
|
|
if ((fd = open(dev->bid_name, O_RDONLY)) < 0) {
|
|
if (errno == ENXIO || errno == ENODEV) {
|
|
fprintf(stderr, "unable to open %s for revalidation\n",
|
|
dev->bid_name);
|
|
blkid_free_dev(dev);
|
|
return NULL;
|
|
}
|
|
/* We don't have read permission, just return cache data. */
|
|
DEB_PROBE("returning unverified data for %s\n", dev->bid_name);
|
|
return dev;
|
|
}
|
|
|
|
size = blkid_get_dev_size(fd);
|
|
|
|
/* See if we can probe this device by its existing type directly */
|
|
for (id = type_array; id->bim_type; id++) {
|
|
if (!strcmp(id->bim_type, dev->bid_type)) {
|
|
int new_sb = id->bim_kbsize << 10;
|
|
/* See if we need to allocate a larger sb buffer */
|
|
if (sb_size < new_sb) {
|
|
char *sav = sb_buf;
|
|
|
|
/* We can't revalidate, return old dev */
|
|
if (!(sb_buf = realloc(sb_buf, new_sb))) {
|
|
fprintf(stderr, "not enough memory for "
|
|
"%s revalidation\n",
|
|
dev->bid_name);
|
|
free(sav);
|
|
goto exit_fd;
|
|
}
|
|
sb_size = new_sb;
|
|
}
|
|
|
|
if (id->bim_probe(fd, &new, dev->bid_name, id, sb_buf,
|
|
size) == 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (sb_buf)
|
|
free(sb_buf);
|
|
|
|
/* Otherwise we need to determine the device type first */
|
|
if (new || (new = blkid_devname_to_dev(dev->bid_name, size))) {
|
|
new->bid_id = dev->bid_id; /* save old id for cache */
|
|
blkid_free_dev(dev);
|
|
dev = blkid_add_dev_to_cache(cache, new);
|
|
}
|
|
|
|
exit_fd:
|
|
close(fd);
|
|
|
|
/* In case the cache is missing the device size */
|
|
if (dev->bid_devsize == 0)
|
|
dev->bid_devsize = size;
|
|
return dev;
|
|
|
|
}
|
|
|
|
#ifdef TEST_PROGRAM
|
|
int main(int argc, char **argv)
|
|
{
|
|
blkid_dev *dev;
|
|
|
|
if (argc != 2) {
|
|
fprintf(stderr, "Usage: %s device\n"
|
|
"Probe a single device to determine type\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
dev = blkid_devname_to_dev(argv[1], 0);
|
|
if (dev)
|
|
blkid_free_dev(dev);
|
|
else
|
|
printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
|
|
return (0);
|
|
}
|
|
#endif
|