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/* * Copyright (c) 2000,2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __XFS_DIR2_DATA_H__ #define __XFS_DIR2_DATA_H__ /* * Directory format 2, data block structures. */ struct xfs_dabuf; struct xfs_da_args; struct xfs_inode; struct xfs_trans; /* * Constants. */ #define XFS_DIR2_DATA_MAGIC 0x58443244 /* XD2D: for multiblock dirs */ #define XFS_DIR2_DATA_ALIGN_LOG 3 /* i.e., 8 bytes */ #define XFS_DIR2_DATA_ALIGN (1 << XFS_DIR2_DATA_ALIGN_LOG) #define XFS_DIR2_DATA_FREE_TAG 0xffff #define XFS_DIR2_DATA_FD_COUNT 3 /* * Directory address space divided into sections, * spaces separated by 32gb. */ #define XFS_DIR2_SPACE_SIZE (1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG)) #define XFS_DIR2_DATA_SPACE 0 #define XFS_DIR2_DATA_OFFSET (XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE) #define XFS_DIR2_DATA_FIRSTDB(mp) \ XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATA_OFFSET) /* * Offsets of . and .. in data space (always block 0) */ #define XFS_DIR2_DATA_DOT_OFFSET \ ((xfs_dir2_data_aoff_t)sizeof(xfs_dir2_data_hdr_t)) #define XFS_DIR2_DATA_DOTDOT_OFFSET \ (XFS_DIR2_DATA_DOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(1)) #define XFS_DIR2_DATA_FIRST_OFFSET \ (XFS_DIR2_DATA_DOTDOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(2)) /* * Structures. */ /* * Describe a free area in the data block. * The freespace will be formatted as a xfs_dir2_data_unused_t. */ typedef struct xfs_dir2_data_free { xfs_dir2_data_off_t offset; /* start of freespace */ xfs_dir2_data_off_t length; /* length of freespace */ } xfs_dir2_data_free_t; /* * Header for the data blocks. * Always at the beginning of a directory-sized block. * The code knows that XFS_DIR2_DATA_FD_COUNT is 3. */ typedef struct xfs_dir2_data_hdr { __uint32_t magic; /* XFS_DIR2_DATA_MAGIC */ /* or XFS_DIR2_BLOCK_MAGIC */ xfs_dir2_data_free_t bestfree[XFS_DIR2_DATA_FD_COUNT]; } xfs_dir2_data_hdr_t; /* * Active entry in a data block. Aligned to 8 bytes. * Tag appears as the last 2 bytes. */ typedef struct xfs_dir2_data_entry { xfs_ino_t inumber; /* inode number */ __uint8_t namelen; /* name length */ __uint8_t name[1]; /* name bytes, no null */ /* variable offset */ xfs_dir2_data_off_t tag; /* starting offset of us */ } xfs_dir2_data_entry_t; /* * Unused entry in a data block. Aligned to 8 bytes. * Tag appears as the last 2 bytes. */ typedef struct xfs_dir2_data_unused { __uint16_t freetag; /* XFS_DIR2_DATA_FREE_TAG */ xfs_dir2_data_off_t length; /* total free length */ /* variable offset */ xfs_dir2_data_off_t tag; /* starting offset of us */ } xfs_dir2_data_unused_t; typedef union { xfs_dir2_data_entry_t entry; xfs_dir2_data_unused_t unused; } xfs_dir2_data_union_t; /* * Generic data block structure, for xfs_db. */ typedef struct xfs_dir2_data { xfs_dir2_data_hdr_t hdr; /* magic XFS_DIR2_DATA_MAGIC */ xfs_dir2_data_union_t u[1]; } xfs_dir2_data_t; /* * Macros. */ /* * Size of a data entry. */ #define XFS_DIR2_DATA_ENTSIZE(n) xfs_dir2_data_entsize(n) static inline int xfs_dir2_data_entsize(int n) { return (int)roundup(offsetof(xfs_dir2_data_entry_t, name[0]) + (n) + \ (uint)sizeof(xfs_dir2_data_off_t), XFS_DIR2_DATA_ALIGN); } /* * Pointer to an entry's tag word. */ #define XFS_DIR2_DATA_ENTRY_TAG_P(dep) xfs_dir2_data_entry_tag_p(dep) static inline xfs_dir2_data_off_t * xfs_dir2_data_entry_tag_p(xfs_dir2_data_entry_t *dep) { return (xfs_dir2_data_off_t *) \ ((char *)(dep) + XFS_DIR2_DATA_ENTSIZE((dep)->namelen) - \ (uint)sizeof(xfs_dir2_data_off_t)); } /* * Pointer to a freespace's tag word. */ #define XFS_DIR2_DATA_UNUSED_TAG_P(dup) \ xfs_dir2_data_unused_tag_p(dup) static inline xfs_dir2_data_off_t * xfs_dir2_data_unused_tag_p(xfs_dir2_data_unused_t *dup) { return (xfs_dir2_data_off_t *) \ ((char *)(dup) + INT_GET((dup)->length, ARCH_CONVERT) \ - (uint)sizeof(xfs_dir2_data_off_t)); } /* * Function declarations. */ #ifdef DEBUG extern void xfs_dir2_data_check(struct xfs_inode *dp, struct xfs_dabuf *bp); #else #define xfs_dir2_data_check(dp,bp) #endif extern xfs_dir2_data_free_t *xfs_dir2_data_freefind(xfs_dir2_data_t *d, xfs_dir2_data_unused_t *dup); extern xfs_dir2_data_free_t *xfs_dir2_data_freeinsert(xfs_dir2_data_t *d, xfs_dir2_data_unused_t *dup, int *loghead); extern void xfs_dir2_data_freescan(struct xfs_mount *mp, xfs_dir2_data_t *d, int *loghead, char *aendp); extern int xfs_dir2_data_init(struct xfs_da_args *args, xfs_dir2_db_t blkno, struct xfs_dabuf **bpp); extern void xfs_dir2_data_log_entry(struct xfs_trans *tp, struct xfs_dabuf *bp, xfs_dir2_data_entry_t *dep); extern void xfs_dir2_data_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp); extern void xfs_dir2_data_log_unused(struct xfs_trans *tp, struct xfs_dabuf *bp, xfs_dir2_data_unused_t *dup); extern void xfs_dir2_data_make_free(struct xfs_trans *tp, struct xfs_dabuf *bp, xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp); extern void xfs_dir2_data_use_free(struct xfs_trans *tp, struct xfs_dabuf *bp, xfs_dir2_data_unused_t *dup, xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp); #endif /* __XFS_DIR2_DATA_H__ */