http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/xfs/xfs_dir2_sf.h

/* * Copyright (c) 2000-2001,2005 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_SF_H__ #define __XFS_DIR2_SF_H__ /* * Directory layout when stored internal to an inode. * * Small directories are packed as tightly as possible so as to * fit into the literal area of the inode. */ struct uio; struct xfs_dabuf; struct xfs_da_args; struct xfs_dir2_block; struct xfs_inode; struct xfs_mount; struct xfs_trans; /* * Maximum size of a shortform directory. */ #define XFS_DIR2_SF_MAX_SIZE \ (XFS_DINODE_MAX_SIZE - (uint)sizeof(xfs_dinode_core_t) - \ (uint)sizeof(xfs_agino_t)) /* * Inode number stored as 8 8-bit values. */ typedef struct { __uint8_t i[8]; } xfs_dir2_ino8_t; /* * Inode number stored as 4 8-bit values. * Works a lot of the time, when all the inode numbers in a directory * fit in 32 bits. */ typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t; typedef union { xfs_dir2_ino8_t i8; xfs_dir2_ino4_t i4; } xfs_dir2_inou_t; #define XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL) /* * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t. * Only need 16 bits, this is the byte offset into the single block form. */ typedef struct { __uint8_t i[2]; } xfs_dir2_sf_off_t; /* * The parent directory has a dedicated field, and the self-pointer must * be calculated on the fly. * * Entries are packed toward the top as tightly as possible. The header * and the elements must be memcpy'd out into a work area to get correct * alignment for the inode number fields. */ typedef struct xfs_dir2_sf_hdr { __uint8_t count; /* count of entries */ __uint8_t i8count; /* count of 8-byte inode #s */ xfs_dir2_inou_t parent; /* parent dir inode number */ } xfs_dir2_sf_hdr_t; typedef struct xfs_dir2_sf_entry { __uint8_t namelen; /* actual name length */ xfs_dir2_sf_off_t offset; /* saved offset */ __uint8_t name[1]; /* name, variable size */ xfs_dir2_inou_t inumber; /* inode number, var. offset */ } xfs_dir2_sf_entry_t; typedef struct xfs_dir2_sf { xfs_dir2_sf_hdr_t hdr; /* shortform header */ xfs_dir2_sf_entry_t list[1]; /* shortform entries */ } xfs_dir2_sf_t; #define XFS_DIR2_SF_HDR_SIZE(i8count) xfs_dir2_sf_hdr_size(i8count) static inline int xfs_dir2_sf_hdr_size(int i8count) { return ((uint)sizeof(xfs_dir2_sf_hdr_t) - \ ((i8count) == 0) * \ ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t))); } #define XFS_DIR2_SF_INUMBERP(sfep) xfs_dir2_sf_inumberp(sfep) static inline xfs_dir2_inou_t *xfs_dir2_sf_inumberp(xfs_dir2_sf_entry_t *sfep) { return (xfs_dir2_inou_t *)&(sfep)->name[(sfep)->namelen]; } #define XFS_DIR2_SF_GET_INUMBER(sfp, from) \ xfs_dir2_sf_get_inumber(sfp, from) static inline xfs_intino_t xfs_dir2_sf_get_inumber(xfs_dir2_sf_t *sfp, xfs_dir2_inou_t *from) { return ((sfp)->hdr.i8count == 0 ? \ (xfs_intino_t)XFS_GET_DIR_INO4((from)->i4) : \ (xfs_intino_t)XFS_GET_DIR_INO8((from)->i8)); } #define XFS_DIR2_SF_PUT_INUMBER(sfp,from,to) \ xfs_dir2_sf_put_inumber(sfp,from,to) static inline void xfs_dir2_sf_put_inumber(xfs_dir2_sf_t *sfp, xfs_ino_t *from, xfs_dir2_inou_t *to) { if ((sfp)->hdr.i8count == 0) XFS_PUT_DIR_INO4(*(from), (to)->i4); else XFS_PUT_DIR_INO8(*(from), (to)->i8); } #define XFS_DIR2_SF_GET_OFFSET(sfep) \ xfs_dir2_sf_get_offset(sfep) static inline xfs_dir2_data_aoff_t xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep) { return INT_GET_UNALIGNED_16_BE(&(sfep)->offset.i); } #define XFS_DIR2_SF_PUT_OFFSET(sfep,off) \ xfs_dir2_sf_put_offset(sfep,off) static inline void xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep, xfs_dir2_data_aoff_t off) { INT_SET_UNALIGNED_16_BE(&(sfep)->offset.i, off); } #define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len) \ xfs_dir2_sf_entsize_byname(sfp,len) static inline int xfs_dir2_sf_entsize_byname(xfs_dir2_sf_t *sfp, int len) { return ((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (len) - \ ((sfp)->hdr.i8count == 0) * \ ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t))); } #define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep) \ xfs_dir2_sf_entsize_byentry(sfp,sfep) static inline int xfs_dir2_sf_entsize_byentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep) { return ((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (sfep)->namelen - \ ((sfp)->hdr.i8count == 0) * \ ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t))); } #define XFS_DIR2_SF_FIRSTENTRY(sfp) xfs_dir2_sf_firstentry(sfp) static inline xfs_dir2_sf_entry_t *xfs_dir2_sf_firstentry(xfs_dir2_sf_t *sfp) { return ((xfs_dir2_sf_entry_t *) \ ((char *)(sfp) + XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count))); } #define XFS_DIR2_SF_NEXTENTRY(sfp,sfep) xfs_dir2_sf_nextentry(sfp,sfep) static inline xfs_dir2_sf_entry_t * xfs_dir2_sf_nextentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep) { return ((xfs_dir2_sf_entry_t *) \ ((char *)(sfep) + XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep))); } /* * Functions. */ extern int xfs_dir2_block_sfsize(struct xfs_inode *dp, struct xfs_dir2_block *block, xfs_dir2_sf_hdr_t *sfhp); extern int xfs_dir2_block_to_sf(struct xfs_da_args *args, struct xfs_dabuf *bp, int size, xfs_dir2_sf_hdr_t *sfhp); extern int xfs_dir2_sf_addname(struct xfs_da_args *args); extern int xfs_dir2_sf_create(struct xfs_da_args *args, xfs_ino_t pino); extern int xfs_dir2_sf_getdents(struct xfs_inode *dp, struct uio *uio, int *eofp, struct xfs_dirent *dbp, xfs_dir2_put_t put); extern int xfs_dir2_sf_lookup(struct xfs_da_args *args); extern int xfs_dir2_sf_removename(struct xfs_da_args *args); extern int xfs_dir2_sf_replace(struct xfs_da_args *args); #endif /* __XFS_DIR2_SF_H__ */