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scoutfs-utils: move super id to block hdr magic

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Move the magic value that identifies the super block into the block
header and use it for btree blocks as well.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2019-04-12 10:54:20 -07:00
committed by Zach Brown
parent dd117593da
commit 64bdda717c
3 changed files with 16 additions and 15 deletions
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utils/src/format.h
+7 -5
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@@ -3,8 +3,10 @@
/* statfs(2) f_type */
#define SCOUTFS_SUPER_MAGIC 0x554f4353 /* "SCOU" */
/* super block id */
#define SCOUTFS_SUPER_ID 0x2e736674756f6373ULL /* "scoutfs." */
/* block header magic values, chosen at random */
#define SCOUTFS_BLOCK_MAGIC_SUPER 0x103c428b
#define SCOUTFS_BLOCK_MAGIC_BTREE 0xe597f96d
/*
* The super block and btree blocks are fixed 4k.
@@ -67,12 +69,12 @@ struct scoutfs_inet_addr {
/*
* This header is stored at the start of btree blocks and the super
* block for verification. The crc is calculated by zeroing the crc and
* padding so the buffer is large and aligned.
* block for verification. The crc field is not included in the
* calculation of the crc.
*/
struct scoutfs_block_header {
__le32 crc;
__le32 _pad;
__le32 magic;
__le64 fsid;
__le64 seq;
__le64 blkno;