diff options
Diffstat (limited to 'fs/xfs/xfs_dinode.h')
| -rw-r--r-- | fs/xfs/xfs_dinode.h | 104 |
1 files changed, 50 insertions, 54 deletions
diff --git a/fs/xfs/xfs_dinode.h b/fs/xfs/xfs_dinode.h index 10f9204b81e..0b7ebf922af 100644 --- a/fs/xfs/xfs_dinode.h +++ b/fs/xfs/xfs_dinode.h @@ -18,32 +18,32 @@ #ifndef __XFS_DINODE_H__ #define __XFS_DINODE_H__ -struct xfs_buf; -struct xfs_mount; - #define XFS_DINODE_VERSION_1 1 #define XFS_DINODE_VERSION_2 2 #define XFS_DINODE_GOOD_VERSION(v) \ (((v) == XFS_DINODE_VERSION_1 || (v) == XFS_DINODE_VERSION_2)) #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ -/* - * Disk inode structure. - * This is just the header; the inode is expanded to fill a variable size - * with the last field expanding. It is split into the core and "other" - * because we only need the core part in the in-core inode. - */ typedef struct xfs_timestamp { __be32 t_sec; /* timestamp seconds */ __be32 t_nsec; /* timestamp nanoseconds */ } xfs_timestamp_t; /* - * Note: Coordinate changes to this structure with the XFS_DI_* #defines - * below, the offsets table in xfs_ialloc_log_di() and struct xfs_icdinode - * in xfs_inode.h. + * On-disk inode structure. + * + * This is just the header or "dinode core", the inode is expanded to fill a + * variable size the leftover area split into a data and an attribute fork. + * The format of the data and attribute fork depends on the format of the + * inode as indicated by di_format and di_aformat. To access the data and + * attribute use the XFS_DFORK_PTR, XFS_DFORK_DPTR, and XFS_DFORK_PTR macros + * below. + * + * There is a very similar struct icdinode in xfs_inode which matches the + * layout of the first 96 bytes of this structure, but is kept in native + * format instead of big endian. */ -typedef struct xfs_dinode_core { +typedef struct xfs_dinode { __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ __be16 di_mode; /* mode and type of file */ __u8 di_version; /* inode version */ @@ -69,33 +69,12 @@ typedef struct xfs_dinode_core { __be16 di_dmstate; /* DMIG state info */ __be16 di_flags; /* random flags, XFS_DIFLAG_... */ __be32 di_gen; /* generation number */ -} xfs_dinode_core_t; -#define DI_MAX_FLUSH 0xffff + /* di_next_unlinked is the only non-core field in the old dinode */ + __be32 di_next_unlinked;/* agi unlinked list ptr */ +} __attribute__((packed)) xfs_dinode_t; -typedef struct xfs_dinode -{ - xfs_dinode_core_t di_core; - /* - * In adding anything between the core and the union, be - * sure to update the macros like XFS_LITINO below. - */ - __be32 di_next_unlinked;/* agi unlinked list ptr */ - union { - xfs_bmdr_block_t di_bmbt; /* btree root block */ - xfs_bmbt_rec_32_t di_bmx[1]; /* extent list */ - xfs_dir2_sf_t di_dir2sf; /* shortform directory v2 */ - char di_c[1]; /* local contents */ - __be32 di_dev; /* device for S_IFCHR/S_IFBLK */ - uuid_t di_muuid; /* mount point value */ - char di_symlink[1]; /* local symbolic link */ - } di_u; - union { - xfs_bmdr_block_t di_abmbt; /* btree root block */ - xfs_bmbt_rec_32_t di_abmx[1]; /* extent list */ - xfs_attr_shortform_t di_attrsf; /* shortform attribute list */ - } di_a; -} xfs_dinode_t; +#define DI_MAX_FLUSH 0xffff /* * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. @@ -108,14 +87,12 @@ typedef struct xfs_dinode /* * Values for di_format */ -typedef enum xfs_dinode_fmt -{ - XFS_DINODE_FMT_DEV, /* CHR, BLK: di_dev */ - XFS_DINODE_FMT_LOCAL, /* DIR, REG: di_c */ - /* LNK: di_symlink */ - XFS_DINODE_FMT_EXTENTS, /* DIR, REG, LNK: di_bmx */ - XFS_DINODE_FMT_BTREE, /* DIR, REG, LNK: di_bmbt */ - XFS_DINODE_FMT_UUID /* MNT: di_uuid */ +typedef enum xfs_dinode_fmt { + XFS_DINODE_FMT_DEV, /* xfs_dev_t */ + XFS_DINODE_FMT_LOCAL, /* bulk data */ + XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ + XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ + XFS_DINODE_FMT_UUID /* uuid_t */ } xfs_dinode_fmt_t; /* @@ -136,8 +113,8 @@ typedef enum xfs_dinode_fmt /* * Inode data & attribute fork sizes, per inode. */ -#define XFS_DFORK_Q(dip) ((dip)->di_core.di_forkoff != 0) -#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_core.di_forkoff << 3)) +#define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) +#define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) #define XFS_DFORK_DSIZE(dip,mp) \ (XFS_DFORK_Q(dip) ? \ @@ -152,23 +129,42 @@ typedef enum xfs_dinode_fmt XFS_DFORK_DSIZE(dip, mp) : \ XFS_DFORK_ASIZE(dip, mp)) -#define XFS_DFORK_DPTR(dip) ((dip)->di_u.di_c) +/* + * Return pointers to the data or attribute forks. + */ +#define XFS_DFORK_DPTR(dip) \ + ((char *)(dip) + sizeof(struct xfs_dinode)) #define XFS_DFORK_APTR(dip) \ - ((dip)->di_u.di_c + XFS_DFORK_BOFF(dip)) + (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) #define XFS_DFORK_PTR(dip,w) \ ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) + #define XFS_DFORK_FORMAT(dip,w) \ ((w) == XFS_DATA_FORK ? \ - (dip)->di_core.di_format : \ - (dip)->di_core.di_aformat) + (dip)->di_format : \ + (dip)->di_aformat) #define XFS_DFORK_NEXTENTS(dip,w) \ ((w) == XFS_DATA_FORK ? \ - be32_to_cpu((dip)->di_core.di_nextents) : \ - be16_to_cpu((dip)->di_core.di_anextents)) + be32_to_cpu((dip)->di_nextents) : \ + be16_to_cpu((dip)->di_anextents)) #define XFS_BUF_TO_DINODE(bp) ((xfs_dinode_t *)XFS_BUF_PTR(bp)) /* + * For block and character special files the 32bit dev_t is stored at the + * beginning of the data fork. + */ +static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) +{ + return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); +} + +static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) +{ + *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); +} + +/* * Values for di_flags * There should be a one-to-one correspondence between these flags and the * XFS_XFLAG_s. |