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authorSven-Göran Bergh <sgb@systemasis.org>2013-01-14 01:21:41 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2013-01-14 01:21:41 (GMT)
commit6928d9f0495d814a08195d0e9805fd91cbb3d384 (patch)
tree7c70e4c9a721fcb0673b48907908c53d19737b21
parent6967578728a3eef43b7b2be4080dafc1b87f528d (diff)
downloadbusybox-6928d9f0495d814a08195d0e9805fd91cbb3d384.tar.gz
busybox-6928d9f0495d814a08195d0e9805fd91cbb3d384.tar.bz2
volume_id: add squashfs detection
function old new delta volume_id_probe_squashfs - 74 +74 fs1 12 16 +4 Signed-off-by: Sven-Göran Bergh <sgb@systemasis.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--util-linux/Config.src10
-rw-r--r--util-linux/volume_id/squashfs.c59
-rw-r--r--util-linux/volume_id/volume_id.c3
-rw-r--r--util-linux/volume_id/volume_id_internal.h2
4 files changed, 74 insertions, 0 deletions
diff --git a/util-linux/Config.src b/util-linux/Config.src
index e4516dd..6c1b928 100644
--- a/util-linux/Config.src
+++ b/util-linux/Config.src
@@ -841,6 +841,16 @@ config FEATURE_VOLUMEID_ROMFS
help
TODO
+config FEATURE_VOLUMEID_SQUASHFS
+ bool "SquashFS filesystem"
+ default y
+ depends on VOLUMEID && FEATURE_BLKID_TYPE
+ help
+ Squashfs is a compressed read-only filesystem for Linux. Squashfs is
+ intended for general read-only filesystem use and in constrained block
+ device/memory systems (e.g. embedded systems) where low overhead is
+ needed.
+
config FEATURE_VOLUMEID_SYSV
bool "sysv filesystem"
default y
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*/);