diff options
Diffstat (limited to 'fs/xfs/xfs_btree.h')
| -rw-r--r-- | fs/xfs/xfs_btree.h | 64 |
1 files changed, 55 insertions, 9 deletions
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h index f932897..6e6c915 100644 --- a/fs/xfs/xfs_btree.h +++ b/fs/xfs/xfs_btree.h @@ -42,11 +42,15 @@ extern kmem_zone_t *xfs_btree_cur_zone; * Generic btree header. * * This is a combination of the actual format used on disk for short and long - * format btrees. The first three fields are shared by both format, but - * the pointers are different and should be used with care. + * format btrees. The first three fields are shared by both format, but the + * pointers are different and should be used with care. * - * To get the size of the actual short or long form headers please use - * the size macros below. Never use sizeof(xfs_btree_block). + * To get the size of the actual short or long form headers please use the size + * macros below. Never use sizeof(xfs_btree_block). + * + * The blkno, crc, lsn, owner and uuid fields are only available in filesystems + * with the crc feature bit, and all accesses to them must be conditional on + * that flag. */ struct xfs_btree_block { __be32 bb_magic; /* magic number for block type */ @@ -56,10 +60,23 @@ struct xfs_btree_block { struct { __be32 bb_leftsib; __be32 bb_rightsib; + + __be64 bb_blkno; + __be64 bb_lsn; + uuid_t bb_uuid; + __be32 bb_owner; + __le32 bb_crc; } s; /* short form pointers */ struct { __be64 bb_leftsib; __be64 bb_rightsib; + + __be64 bb_blkno; + __be64 bb_lsn; + uuid_t bb_uuid; + __be64 bb_owner; + __le32 bb_crc; + __be32 bb_pad; /* padding for alignment */ } l; /* long form pointers */ } bb_u; /* rest */ }; @@ -67,6 +84,16 @@ struct xfs_btree_block { #define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */ #define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */ +/* sizes of CRC enabled btree blocks */ +#define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40) +#define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48) + + +#define XFS_BTREE_SBLOCK_CRC_OFF \ + offsetof(struct xfs_btree_block, bb_u.s.bb_crc) +#define XFS_BTREE_LBLOCK_CRC_OFF \ + offsetof(struct xfs_btree_block, bb_u.l.bb_crc) + /* * Generic key, ptr and record wrapper structures. @@ -101,13 +128,11 @@ union xfs_btree_rec { #define XFS_BB_NUMRECS 0x04 #define XFS_BB_LEFTSIB 0x08 #define XFS_BB_RIGHTSIB 0x10 +#define XFS_BB_BLKNO 0x20 #define XFS_BB_NUM_BITS 5 #define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1) - -/* - * Magic numbers for btree blocks. - */ -extern const __uint32_t xfs_magics[]; +#define XFS_BB_NUM_BITS_CRC 8 +#define XFS_BB_ALL_BITS_CRC ((1 << XFS_BB_NUM_BITS_CRC) - 1) /* * Generic stats interface @@ -256,6 +281,7 @@ typedef struct xfs_btree_cur #define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */ #define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */ #define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */ +#define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */ #define XFS_BTREE_NOERROR 0 @@ -393,8 +419,20 @@ xfs_btree_init_block( __u32 magic, __u16 level, __u16 numrecs, + __u64 owner, unsigned int flags); +void +xfs_btree_init_block_int( + struct xfs_mount *mp, + struct xfs_btree_block *buf, + xfs_daddr_t blkno, + __u32 magic, + __u16 level, + __u16 numrecs, + __u64 owner, + unsigned int flags); + /* * Common btree core entry points. */ @@ -408,6 +446,14 @@ int xfs_btree_delete(struct xfs_btree_cur *, int *); int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *); /* + * btree block CRC helpers + */ +void xfs_btree_lblock_calc_crc(struct xfs_buf *); +bool xfs_btree_lblock_verify_crc(struct xfs_buf *); +void xfs_btree_sblock_calc_crc(struct xfs_buf *); +bool xfs_btree_sblock_verify_crc(struct xfs_buf *); + +/* * Internal btree helpers also used by xfs_bmap.c. */ void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int); |
