diff options
Diffstat (limited to 'util-linux/volume_id/sysv.c')
| -rw-r--r-- | util-linux/volume_id/sysv.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/util-linux/volume_id/sysv.c b/util-linux/volume_id/sysv.c new file mode 100644 index 0000000..71c0fd4 --- /dev/null +++ b/util-linux/volume_id/sysv.c @@ -0,0 +1,125 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "volume_id_internal.h" + +#define SYSV_NICINOD 100 +#define SYSV_NICFREE 50 + +struct sysv_super +{ + uint16_t s_isize; + uint16_t s_pad0; + uint32_t s_fsize; + uint16_t s_nfree; + uint16_t s_pad1; + uint32_t s_free[SYSV_NICFREE]; + uint16_t s_ninode; + uint16_t s_pad2; + uint16_t s_inode[SYSV_NICINOD]; + uint8_t s_flock; + uint8_t s_ilock; + uint8_t s_fmod; + uint8_t s_ronly; + uint32_t s_time; + uint16_t s_dinfo[4]; + uint32_t s_tfree; + uint16_t s_tinode; + uint16_t s_pad3; + uint8_t s_fname[6]; + uint8_t s_fpack[6]; + uint32_t s_fill[12]; + uint32_t s_state; + uint32_t s_magic; + uint32_t s_type; +} __attribute__((__packed__)); + +#define XENIX_NICINOD 100 +#define XENIX_NICFREE 100 + +struct xenix_super { + uint16_t s_isize; + uint32_t s_fsize; + uint16_t s_nfree; + uint32_t s_free[XENIX_NICFREE]; + uint16_t s_ninode; + uint16_t s_inode[XENIX_NICINOD]; + uint8_t s_flock; + uint8_t s_ilock; + uint8_t s_fmod; + uint8_t s_ronly; + uint32_t s_time; + uint32_t s_tfree; + uint16_t s_tinode; + uint16_t s_dinfo[4]; + uint8_t s_fname[6]; + uint8_t s_fpack[6]; + uint8_t s_clean; + uint8_t s_fill[371]; + uint32_t s_magic; + uint32_t s_type; +} __attribute__((__packed__)); + +#define SYSV_SUPERBLOCK_BLOCK 0x01 +#define SYSV_MAGIC 0xfd187e20 +#define XENIX_SUPERBLOCK_BLOCK 0x18 +#define XENIX_MAGIC 0x2b5544 +#define SYSV_MAX_BLOCKSIZE 0x800 + +int volume_id_probe_sysv(struct volume_id *id, uint64_t off) +{ + struct sysv_super *vs; + struct xenix_super *xs; + unsigned boff; + + dbg("probing at offset 0x%llx", (unsigned long long) off); + + for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) { + vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200); + if (vs == NULL) + return -1; + + if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) { + volume_id_set_label_raw(id, vs->s_fname, 6); + volume_id_set_label_string(id, vs->s_fname, 6); + id->type = "sysv"; + goto found; + } + } + + for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) { + xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200); + if (xs == NULL) + return -1; + + if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) { + volume_id_set_label_raw(id, xs->s_fname, 6); + volume_id_set_label_string(id, xs->s_fname, 6); + id->type = "xenix"; + goto found; + } + } + + return -1; + + found: + volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); + return 0; +} |