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    Annotation of /trunk/mkinitrd-magellan/busybox/util-linux/volume_id/ocfs2.c

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    Revision 984 - (hide annotations) (download)
    Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
    File MIME type: text/plain
    File size: 4394 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 niro 816 /*
    2     * volume_id - reads filesystem label and uuid
    3     *
    4     * Copyright (C) Andre Masella <andre@masella.no-ip.org>
    5     *
    6     * This library is free software; you can redistribute it and/or
    7     * modify it under the terms of the GNU Lesser General Public
    8     * License as published by the Free Software Foundation; either
    9     * version 2.1 of the License, or (at your option) any later version.
    10     *
    11     * This library is distributed in the hope that it will be useful,
    12     * but WITHOUT ANY WARRANTY; without even the implied warranty of
    13     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    14     * Lesser General Public License for more details.
    15     *
    16     * You should have received a copy of the GNU Lesser General Public
    17     * License along with this library; if not, write to the Free Software
    18     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    19     */
    20    
    21     #include "volume_id_internal.h"
    22    
    23     /* All these values are taken from ocfs2-tools's ocfs2_fs.h */
    24     #define OCFS2_VOL_UUID_LEN 16
    25     #define OCFS2_MAX_VOL_LABEL_LEN 64
    26     #define OCFS2_SUPERBLOCK_OFFSET 0x2000
    27    
    28    
    29     /* This is the superblock. The OCFS2 header files have structs in structs.
    30     This is one has been simplified since we only care about the superblock.
    31     */
    32    
    33     struct ocfs2_super_block {
    34     uint8_t i_signature[8]; /* Signature for validation */
    35     uint32_t i_generation; /* Generation number */
    36     int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */
    37     uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */
    38     uint32_t i_reserved0;
    39     uint32_t i_clusters; /* Cluster count */
    40     uint32_t i_uid; /* Owner UID */
    41     uint32_t i_gid; /* Owning GID */
    42     uint64_t i_size; /* Size in bytes */
    43     uint16_t i_mode; /* File mode */
    44     uint16_t i_links_count; /* Links count */
    45     uint32_t i_flags; /* File flags */
    46     uint64_t i_atime; /* Access time */
    47     uint64_t i_ctime; /* Creation time */
    48     uint64_t i_mtime; /* Modification time */
    49     uint64_t i_dtime; /* Deletion time */
    50     uint64_t i_blkno; /* Offset on disk, in blocks */
    51     uint64_t i_last_eb_blk; /* Pointer to last extent block */
    52     uint32_t i_fs_generation; /* Generation per fs-instance */
    53     uint32_t i_atime_nsec;
    54     uint32_t i_ctime_nsec;
    55     uint32_t i_mtime_nsec;
    56     uint64_t i_reserved1[9];
    57     uint64_t i_pad1; /* Generic way to refer to this 64bit union */
    58     /* Normally there is a union of the different block types, but we only care about the superblock. */
    59     uint16_t s_major_rev_level;
    60     uint16_t s_minor_rev_level;
    61     uint16_t s_mnt_count;
    62     int16_t s_max_mnt_count;
    63     uint16_t s_state; /* File system state */
    64     uint16_t s_errors; /* Behaviour when detecting errors */
    65     uint32_t s_checkinterval; /* Max time between checks */
    66     uint64_t s_lastcheck; /* Time of last check */
    67     uint32_t s_creator_os; /* OS */
    68     uint32_t s_feature_compat; /* Compatible feature set */
    69     uint32_t s_feature_incompat; /* Incompatible feature set */
    70     uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */
    71     uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */
    72     uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */
    73     uint32_t s_blocksize_bits; /* Blocksize for this fs */
    74     uint32_t s_clustersize_bits; /* Clustersize for this fs */
    75     uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */
    76     uint16_t s_reserved1;
    77     uint32_t s_reserved2;
    78     uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */
    79     uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
    80     uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
    81 niro 984 } PACKED;
    82 niro 816
    83 niro 984 int FAST_FUNC volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/)
    84 niro 816 {
    85 niro 984 #define off ((uint64_t)0)
    86 niro 816 struct ocfs2_super_block *os;
    87    
    88     dbg("probing at offset 0x%llx", (unsigned long long) off);
    89    
    90     os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200);
    91     if (os == NULL)
    92     return -1;
    93    
    94     if (memcmp(os->i_signature, "OCFSV2", 6) != 0) {
    95     return -1;
    96     }
    97    
    98     // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
    99     // volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
    100     // OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
    101     volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
    102     OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
    103     volume_id_set_uuid(id, os->s_uuid, UUID_DCE);
    104     // id->type = "ocfs2";
    105     return 0;
    106     }