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Diffstat (limited to 'fs/xfs/xfs_dir2_data.h')
| -rw-r--r-- | fs/xfs/xfs_dir2_data.h | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_data.h b/fs/xfs/xfs_dir2_data.h new file mode 100644 index 000000000000..3f02294ccff0 --- /dev/null +++ b/fs/xfs/xfs_dir2_data.h @@ -0,0 +1,231 @@ +/* + * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 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. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ +#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. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTSIZE) +int xfs_dir2_data_entsize(int n); +#define XFS_DIR2_DATA_ENTSIZE(n) xfs_dir2_data_entsize(n) +#else +#define XFS_DIR2_DATA_ENTSIZE(n) \ + ((int)(roundup(offsetof(xfs_dir2_data_entry_t, name[0]) + (n) + \ + (uint)sizeof(xfs_dir2_data_off_t), XFS_DIR2_DATA_ALIGN))) +#endif + +/* + * Pointer to an entry's tag word. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTRY_TAG_P) +xfs_dir2_data_off_t *xfs_dir2_data_entry_tag_p(xfs_dir2_data_entry_t *dep); +#define XFS_DIR2_DATA_ENTRY_TAG_P(dep) xfs_dir2_data_entry_tag_p(dep) +#else +#define XFS_DIR2_DATA_ENTRY_TAG_P(dep) \ + ((xfs_dir2_data_off_t *)\ + ((char *)(dep) + XFS_DIR2_DATA_ENTSIZE((dep)->namelen) - \ + (uint)sizeof(xfs_dir2_data_off_t))) +#endif + +/* + * Pointer to a freespace's tag word. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_UNUSED_TAG_P) +xfs_dir2_data_off_t *xfs_dir2_data_unused_tag_p(xfs_dir2_data_unused_t *dup); +#define XFS_DIR2_DATA_UNUSED_TAG_P(dup) \ + xfs_dir2_data_unused_tag_p(dup) +#else +#define XFS_DIR2_DATA_UNUSED_TAG_P(dup) \ + ((xfs_dir2_data_off_t *)\ + ((char *)(dup) + INT_GET((dup)->length, ARCH_CONVERT) \ + - (uint)sizeof(xfs_dir2_data_off_t))) +#endif + +/* + * 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_freeremove(xfs_dir2_data_t *d, + xfs_dir2_data_free_t *dfp, 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__ */ |