215 lines
5.1 KiB
C
215 lines
5.1 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.h"
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typedef int (*raid_probe_fptr)(struct volume_id *id, uint64_t off, uint64_t size);
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typedef int (*probe_fptr)(struct volume_id *id, uint64_t off);
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static const raid_probe_fptr raid1[] = {
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#if ENABLE_FEATURE_VOLUMEID_LINUXRAID
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volume_id_probe_linux_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_ISWRAID
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volume_id_probe_intel_software_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_LSIRAID
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volume_id_probe_lsi_mega_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_VIARAID
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volume_id_probe_via_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_SILICONRAID
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volume_id_probe_silicon_medley_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
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volume_id_probe_nvidia_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_PROMISERAID
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volume_id_probe_promise_fasttrack_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
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volume_id_probe_highpoint_45x_raid,
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#endif
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};
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static const probe_fptr raid2[] = {
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#if ENABLE_FEATURE_VOLUMEID_LVM
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volume_id_probe_lvm1,
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volume_id_probe_lvm2,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
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volume_id_probe_highpoint_37x_raid,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_LUKS
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volume_id_probe_luks,
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#endif
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};
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/* signature in the first block, only small buffer needed */
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static const probe_fptr fs1[] = {
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#if ENABLE_FEATURE_VOLUMEID_FAT
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volume_id_probe_vfat,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_MAC
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volume_id_probe_mac_partition_map,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_XFS
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volume_id_probe_xfs,
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#endif
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};
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/* fill buffer with maximum */
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static const probe_fptr fs2[] = {
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#if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
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volume_id_probe_linux_swap,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_EXT
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volume_id_probe_ext,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_REISERFS
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volume_id_probe_reiserfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_JFS
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volume_id_probe_jfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_UDF
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volume_id_probe_udf,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_ISO9660
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volume_id_probe_iso9660,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_HFS
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volume_id_probe_hfs_hfsplus,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_UFS
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volume_id_probe_ufs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_NTFS
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volume_id_probe_ntfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_CRAMFS
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volume_id_probe_cramfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_ROMFS
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volume_id_probe_romfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_HPFS
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volume_id_probe_hpfs,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_SYSV
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volume_id_probe_sysv,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_MINIX
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volume_id_probe_minix,
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#endif
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#if ENABLE_FEATURE_VOLUMEID_OCFS2
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volume_id_probe_ocfs2,
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#endif
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};
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int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
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{
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int i;
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if (id == NULL)
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return -EINVAL;
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/* probe for raid first, cause fs probes may be successful on raid members */
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if (size) {
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for (i = 0; i < ARRAY_SIZE(raid1); i++)
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if (raid1[i](id, off, size) == 0)
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goto ret;
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}
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for (i = 0; i < ARRAY_SIZE(raid2); i++)
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if (raid2[i](id, off) == 0)
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goto ret;
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/* signature in the first block, only small buffer needed */
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for (i = 0; i < ARRAY_SIZE(fs1); i++)
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if (fs1[i](id, off) == 0)
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goto ret;
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/* fill buffer with maximum */
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volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
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for (i = 0; i < ARRAY_SIZE(fs2); i++)
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if (fs2[i](id, off) == 0)
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goto ret;
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return -1;
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ret:
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/* If the filestystem in recognized, we free the allocated buffers,
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otherwise they will stay in place for the possible next probe call */
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volume_id_free_buffer(id);
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return 0;
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}
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/* open volume by device node */
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struct volume_id *volume_id_open_node(const char *path)
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{
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struct volume_id *id;
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int fd;
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fd = xopen(path, O_RDONLY);
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id = xzalloc(sizeof(struct volume_id));
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id->fd = fd;
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///* close fd on device close */
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//id->fd_close = 1;
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return id;
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}
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#ifdef UNUSED
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/* open volume by major/minor */
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struct volume_id *volume_id_open_dev_t(dev_t devt)
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{
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struct volume_id *id;
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char *tmp_node[VOLUME_ID_PATH_MAX];
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tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
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(unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
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/* create temporary node to open block device */
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unlink(tmp_node);
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if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
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bb_perror_msg_and_die("cannot mknod(%s)", tmp_node);
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id = volume_id_open_node(tmp_node);
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unlink(tmp_node);
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free(tmp_node);
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return id;
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}
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#endif
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void free_volume_id(struct volume_id *id)
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{
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if (id == NULL)
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return;
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//if (id->fd_close != 0) - always true
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close(id->fd);
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volume_id_free_buffer(id);
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free(id->partitions);
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free(id);
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}
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