| Message ID | 20230606092806.1604491-11-chandan.babu@oracle.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | Metadump v2 | expand |
On Tue, Jun 06, 2023 at 02:57:53PM +0530, Chandan Babu R wrote: > 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. > > Signed-off-by: Chandan Babu R <chandan.babu@oracle.com> > --- > include/xfs_metadump.h | 58 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 58 insertions(+) > > diff --git a/include/xfs_metadump.h b/include/xfs_metadump.h > index a4dca25c..518cb302 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 +25,60 @@ 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; > + > +#define XFS_MD2_INCOMPAT_OBFUSCATED (1 << 0) > +#define XFS_MD2_INCOMPAT_FULLBLOCKS (1 << 1) > +#define XFS_MD2_INCOMPAT_DIRTYLOG (1 << 2) > +#define XFS_MD2_INCOMPAT_EXTERNALLOG (1 << 3) Please document the meaning of these four flags. /* * User-supplied directory entry and extended attribute names have been * obscured, and extended attribute values are zeroed to protect privacy. */ #define XFS_MD2_INCOMPAT_OBFUSCATED (1 << 0) /* Full blocks have been dumped. */ #define XFS_MD2_INCOMPAT_FULLBLOCKS (1 << 1) /* Log was dirty. */ #define XFS_MD2_INCOMPAT_DIRTYLOG (1 << 2) /* Dump contains external log contents. */ #define XFS_MD2_INCOMPAT_EXTERNALLOG (1 << 3) Otherwise looks fine to me. --D > + > +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_ */ > -- > 2.39.1 >
On Wed, Jul 12, 2023 at 10:18:42 AM -0700, Darrick J. Wong wrote: > On Tue, Jun 06, 2023 at 02:57:53PM +0530, Chandan Babu R wrote: >> 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. >> >> Signed-off-by: Chandan Babu R <chandan.babu@oracle.com> >> --- >> include/xfs_metadump.h | 58 ++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 58 insertions(+) >> >> diff --git a/include/xfs_metadump.h b/include/xfs_metadump.h >> index a4dca25c..518cb302 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 +25,60 @@ 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; >> + >> +#define XFS_MD2_INCOMPAT_OBFUSCATED (1 << 0) >> +#define XFS_MD2_INCOMPAT_FULLBLOCKS (1 << 1) >> +#define XFS_MD2_INCOMPAT_DIRTYLOG (1 << 2) >> +#define XFS_MD2_INCOMPAT_EXTERNALLOG (1 << 3) > > Please document the meaning of these four flags. > > /* > * User-supplied directory entry and extended attribute names have been > * obscured, and extended attribute values are zeroed to protect privacy. > */ > #define XFS_MD2_INCOMPAT_OBFUSCATED (1 << 0) > > /* Full blocks have been dumped. */ > #define XFS_MD2_INCOMPAT_FULLBLOCKS (1 << 1) > > /* Log was dirty. */ > #define XFS_MD2_INCOMPAT_DIRTYLOG (1 << 2) > > /* Dump contains external log contents. */ > #define XFS_MD2_INCOMPAT_EXTERNALLOG (1 << 3) > > Otherwise looks fine to me. > Sure. I will add the required comments.
diff --git a/include/xfs_metadump.h b/include/xfs_metadump.h index a4dca25c..518cb302 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 +25,60 @@ 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; + +#define XFS_MD2_INCOMPAT_OBFUSCATED (1 << 0) +#define XFS_MD2_INCOMPAT_FULLBLOCKS (1 << 1) +#define XFS_MD2_INCOMPAT_DIRTYLOG (1 << 2) +#define XFS_MD2_INCOMPAT_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_ */
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. Signed-off-by: Chandan Babu R <chandan.babu@oracle.com> --- include/xfs_metadump.h | 58 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+)