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| author | Chandan Babu R <chandan.babu@oracle.com> | 2023-11-06 18:40:43 +0530 |
|---|---|---|
| committer | Carlos Maiolino <cem@kernel.org> | 2023-11-21 14:09:36 +0100 |
| commit | ead0662803cb98d441b4eb9e2bfc4c4875cf92ef (patch) | |
| tree | d002f9e64e7fdca61623bb0ab3f45aa48e7bd7d1 | |
| parent | 46944d20004aea2d3e8bd8cbee088257c759ce6e (diff) | |
| download | xfsprogs-dev-ead0662803cb98d441b4eb9e2bfc4c4875cf92ef.tar.gz | |
metadump: Define metadump v2 ondisk format structures and macros
The corresponding metadump file's disk layout is as shown below,
|------------------------------|
| struct xfs_metadump_header |
|------------------------------|
| struct xfs_meta_extent 0 |
| Extent 0's data |
| struct xfs_meta_extent 1 |
| Extent 1's data |
| ... |
| struct xfs_meta_extent (n-1) |
| Extent (n-1)'s data |
|------------------------------|
The "struct xfs_metadump_header" is followed by alternating series of "struct
xfs_meta_extent" and the extent itself.
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
| -rw-r--r-- | include/xfs_metadump.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/include/xfs_metadump.h b/include/xfs_metadump.h index a4dca25cb9..e9c3dcb8f7 100644 --- a/include/xfs_metadump.h +++ b/include/xfs_metadump.h @@ -8,7 +8,9 @@ #define _XFS_METADUMP_H_ #define XFS_MD_MAGIC_V1 0x5846534d /* 'XFSM' */ +#define XFS_MD_MAGIC_V2 0x584D4432 /* 'XMD2' */ +/* Metadump v1 */ typedef struct xfs_metablock { __be32 mb_magic; __be16 mb_count; @@ -23,4 +25,70 @@ typedef struct xfs_metablock { #define XFS_METADUMP_FULLBLOCKS (1 << 2) #define XFS_METADUMP_DIRTYLOG (1 << 3) +/* + * Metadump v2 + * + * The following diagram depicts the ondisk layout of the metadump v2 format. + * + * |------------------------------| + * | struct xfs_metadump_header | + * |------------------------------| + * | struct xfs_meta_extent 0 | + * | Extent 0's data | + * | struct xfs_meta_extent 1 | + * | Extent 1's data | + * | ... | + * | struct xfs_meta_extent (n-1) | + * | Extent (n-1)'s data | + * |------------------------------| + * + * The "struct xfs_metadump_header" is followed by alternating series of "struct + * xfs_meta_extent" and the extent itself. + */ +struct xfs_metadump_header { + __be32 xmh_magic; + __be32 xmh_version; + __be32 xmh_compat_flags; + __be32 xmh_incompat_flags; + __be64 xmh_reserved; +} __packed; + +/* + * User-supplied directory entry and extended attribute names have been + * obscured, and extended attribute values are zeroed to protect privacy. + */ +#define XFS_MD2_COMPAT_OBFUSCATED (1 << 0) + +/* Full blocks have been dumped. */ +#define XFS_MD2_COMPAT_FULLBLOCKS (1 << 1) + +/* Log was dirty. */ +#define XFS_MD2_COMPAT_DIRTYLOG (1 << 2) + +/* Dump contains external log contents. */ +#define XFS_MD2_COMPAT_EXTERNALLOG (1 << 3) + +struct xfs_meta_extent { + /* + * Lowest 54 bits are used to store 512 byte addresses. + * Next 2 bits is used for indicating the device. + * 00 - Data device + * 01 - External log + */ + __be64 xme_addr; + /* In units of 512 byte blocks */ + __be32 xme_len; +} __packed; + +#define XME_ADDR_DEVICE_SHIFT 54 + +#define XME_ADDR_DADDR_MASK ((1ULL << XME_ADDR_DEVICE_SHIFT) - 1) + +/* Extent was copied from the data device */ +#define XME_ADDR_DATA_DEVICE (0ULL << XME_ADDR_DEVICE_SHIFT) +/* Extent was copied from the log device */ +#define XME_ADDR_LOG_DEVICE (1ULL << XME_ADDR_DEVICE_SHIFT) + +#define XME_ADDR_DEVICE_MASK (3ULL << XME_ADDR_DEVICE_SHIFT) + #endif /* _XFS_METADUMP_H_ */ |