diff options
Diffstat (limited to 'util-linux/volume_id')
| -rw-r--r-- | util-linux/volume_id/squashfs.c | 59 | ||||
| -rw-r--r-- | util-linux/volume_id/volume_id.c | 3 | ||||
| -rw-r--r-- | util-linux/volume_id/volume_id_internal.h | 2 |
3 files changed, 64 insertions, 0 deletions
diff --git a/util-linux/volume_id/squashfs.c b/util-linux/volume_id/squashfs.c new file mode 100644 index 0000000..331ac20 --- /dev/null +++ b/util-linux/volume_id/squashfs.c @@ -0,0 +1,59 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org> + * + * Licensed under GPLv2, see file LICENSE in this source tree. + */ + +//config:config FEATURE_VOLUMEID_SQUASHFS +//config: bool "SquashFS filesystem" +//config: default y +//config: depends on VOLUMEID && FEATURE_BLKID_TYPE +//config: help +//config: Squashfs is a compressed read-only filesystem for Linux. Squashfs is +//config: intended for general read-only filesystem use and in constrained block +//config: device/memory systems (e.g. embedded systems) where low overhead is +//config: needed. + +//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SQUASHFS) += squashfs.o + +#include "volume_id_internal.h" + +struct squashfs_superblock { + uint32_t magic; +/* + uint32_t dummy[6]; + uint16_t major; + uint16_t minor; +*/ +} PACKED; + +int FAST_FUNC volume_id_probe_squashfs(struct volume_id *id /*,uint64_t off*/) +{ +#define off ((uint64_t)0) + struct squashfs_superblock *sb; + + dbg("SquashFS: probing at offset 0x%llx", (unsigned long long) off); + sb = volume_id_get_buffer(id, off, 0x200); + if (!sb) + return -1; + + // Old SquashFS (pre 4.0) can be both big and little endian, so test for both. + // Likewise, it is commonly used in firwmare with some non-standard signatures. +#define pack(a,b,c,d) ( (uint32_t)((a * 256 + b) * 256 + c) * 256 + d ) +#define SIG1 pack('s','q','s','h') +#define SIG2 pack('h','s','q','s') +#define SIG3 pack('s','h','s','q') +#define SIG4 pack('q','s','h','s') + if (sb->magic == SIG1 + || sb->magic == SIG2 + || sb->magic == SIG3 + || sb->magic == SIG4 + ) { + IF_FEATURE_BLKID_TYPE(id->type = "squashfs";) + return 0; + } + + return -1; +} diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c index 3c3c698..f0fc84c 100644 --- a/util-linux/volume_id/volume_id.c +++ b/util-linux/volume_id/volume_id.c @@ -99,6 +99,9 @@ static const probe_fptr fs1[] = { #if ENABLE_FEATURE_VOLUMEID_MAC volume_id_probe_mac_partition_map, #endif +#if ENABLE_FEATURE_VOLUMEID_SQUASHFS + volume_id_probe_squashfs, +#endif #if ENABLE_FEATURE_VOLUMEID_XFS volume_id_probe_xfs, #endif diff --git a/util-linux/volume_id/volume_id_internal.h b/util-linux/volume_id/volume_id_internal.h index e26ebaa..3f02bd5 100644 --- a/util-linux/volume_id/volume_id_internal.h +++ b/util-linux/volume_id/volume_id_internal.h @@ -227,6 +227,8 @@ int FAST_FUNC volume_id_probe_reiserfs(struct volume_id *id /*,uint64_t off*/); int FAST_FUNC volume_id_probe_romfs(struct volume_id *id /*,uint64_t off*/); +int FAST_FUNC volume_id_probe_squashfs(struct volume_id *id /*,uint64_t off*/); + int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/); int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/); |