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authorGravatar Mike Frysinger <vapier@gentoo.org>2015-12-16 14:42:25 -0500
committerGravatar Mike Frysinger <vapier@gentoo.org>2015-12-16 14:42:25 -0500
commite0942acb9e186cbfc16afe704e10a8af9cd1cc58 (patch)
treeb6181b4d21ca5761db0bb914cfa9f659308c29cb /util-linux/volume_id
parent5f11ec3f6a7e4fe6cc2626ccb7cda4ecb5c3938a (diff)
downloadbusybox-e0942acb9e186cbfc16afe704e10a8af9cd1cc58.tar.gz
busybox-e0942acb9e186cbfc16afe704e10a8af9cd1cc58.tar.bz2
blkid: add bcache support
URL: https://bugs.gentoo.org/508596 Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'util-linux/volume_id')
-rw-r--r--util-linux/volume_id/bcache.c110
-rw-r--r--util-linux/volume_id/volume_id.c3
-rw-r--r--util-linux/volume_id/volume_id_internal.h2
3 files changed, 115 insertions, 0 deletions
diff --git a/util-linux/volume_id/bcache.c b/util-linux/volume_id/bcache.c
new file mode 100644
index 000000000..648e44de5
--- /dev/null
+++ b/util-linux/volume_id/bcache.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2013 Rolf Fokkens <rolf@fokkens.nl>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * Based on code fragments from bcache-tools by Kent Overstreet:
+ * http://evilpiepirate.org/git/bcache-tools.git
+ */
+
+//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_BCACHE) += bcache.o
+
+//config:
+//config:config FEATURE_VOLUMEID_BCACHE
+//config: bool "bcache filesystem"
+//config: default y
+//config: depends on VOLUMEID
+//config: help
+//config: TODO
+//config:
+
+#include "volume_id_internal.h"
+
+#define SB_LABEL_SIZE 32
+#define SB_JOURNAL_BUCKETS 256U
+
+static const char bcache_magic[] = {
+ 0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
+ 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81
+};
+
+struct bcache_super_block {
+ uint64_t csum;
+ uint64_t offset; /* sector where this sb was written */
+ uint64_t version;
+
+ uint8_t magic[16];
+
+ uint8_t uuid[16];
+ union {
+ uint8_t set_uuid[16];
+ uint64_t set_magic;
+ };
+ uint8_t label[SB_LABEL_SIZE];
+
+ uint64_t flags;
+ uint64_t seq;
+ uint64_t pad[8];
+
+ union {
+ struct {
+ /* Cache devices */
+ uint64_t nbuckets; /* device size */
+
+ uint16_t block_size; /* sectors */
+ uint16_t bucket_size; /* sectors */
+
+ uint16_t nr_in_set;
+ uint16_t nr_this_dev;
+ };
+ struct {
+ /* Backing devices */
+ uint64_t data_offset;
+
+ /*
+ * block_size from the cache device section is still used by
+ * backing devices, so don't add anything here until we fix
+ * things to not need it for backing devices anymore
+ */
+ };
+ };
+
+ uint32_t last_mount; /* time_t */
+
+ uint16_t first_bucket;
+ union {
+ uint16_t njournal_buckets;
+ uint16_t keys;
+ };
+ uint64_t d[SB_JOURNAL_BUCKETS]; /* journal buckets */
+};
+
+/* magic string */
+#define BCACHE_SB_MAGIC bcache_magic
+/* magic string len */
+#define BCACHE_SB_MAGIC_LEN sizeof (bcache_magic)
+/* super block offset */
+#define BCACHE_SB_OFF 0x1000
+/* supper block offset in kB */
+#define BCACHE_SB_KBOFF (BCACHE_SB_OFF >> 10)
+/* magic string offset within super block */
+#define BCACHE_SB_MAGIC_OFF offsetof (struct bcache_super_block, magic)
+
+int FAST_FUNC volume_id_probe_bcache(struct volume_id *id /*,uint64_t off*/)
+{
+ struct bcache_super_block *sb;
+
+ sb = volume_id_get_buffer(id, BCACHE_SB_OFF, sizeof(*sb));
+ if (sb == NULL)
+ return -1;
+
+ if (memcmp(sb->magic, BCACHE_SB_MAGIC, BCACHE_SB_MAGIC_LEN) != 0)
+ return -1;
+
+ volume_id_set_label_string(id, sb->label, SB_LABEL_SIZE);
+ volume_id_set_uuid(id, sb->uuid, UUID_DCE);
+ IF_FEATURE_BLKID_TYPE(id->type = "bcache";)
+
+ return 0;
+}
diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c
index 5c459a0e2..3f71e0084 100644
--- a/util-linux/volume_id/volume_id.c
+++ b/util-linux/volume_id/volume_id.c
@@ -107,6 +107,9 @@ static const probe_fptr fs1[] = {
#if ENABLE_FEATURE_VOLUMEID_XFS
volume_id_probe_xfs,
#endif
+#if ENABLE_FEATURE_VOLUMEID_BCACHE
+ volume_id_probe_bcache,
+#endif
};
/* fill buffer with maximum */
diff --git a/util-linux/volume_id/volume_id_internal.h b/util-linux/volume_id/volume_id_internal.h
index 6e2dbd7bb..3061ac4d5 100644
--- a/util-linux/volume_id/volume_id_internal.h
+++ b/util-linux/volume_id/volume_id_internal.h
@@ -169,6 +169,8 @@ int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/,
/* FS */
+int FAST_FUNC volume_id_probe_bcache(struct volume_id *id /*,uint64_t off*/);
+
int FAST_FUNC volume_id_probe_btrfs(struct volume_id *id /*,uint64_t off*/);
int FAST_FUNC volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/);