1 /* 2 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __XFS_ATTR_SF_H__ 19 #define __XFS_ATTR_SF_H__ 20 21 /* 22 * Attribute storage when stored inside the inode. 23 * 24 * Small attribute lists are packed as tightly as possible so as 25 * to fit into the literal area of the inode. 26 */ 27 28 /* 29 * Entries are packed toward the top as tight as possible. 30 */ 31 typedef struct xfs_attr_shortform { 32 struct xfs_attr_sf_hdr { /* constant-structure header block */ 33 __be16 totsize; /* total bytes in shortform list */ 34 __u8 count; /* count of active entries */ 35 } hdr; 36 struct xfs_attr_sf_entry { 37 __uint8_t namelen; /* actual length of name (no NULL) */ 38 __uint8_t valuelen; /* actual length of value (no NULL) */ 39 __uint8_t flags; /* flags bits (see xfs_attr_leaf.h) */ 40 __uint8_t nameval[1]; /* name & value bytes concatenated */ 41 } list[1]; /* variable sized array */ 42 } xfs_attr_shortform_t; 43 typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t; 44 typedef struct xfs_attr_sf_entry xfs_attr_sf_entry_t; 45 46 /* 47 * We generate this then sort it, attr_list() must return things in hash-order. 48 */ 49 typedef struct xfs_attr_sf_sort { 50 __uint8_t entno; /* entry number in original list */ 51 __uint8_t namelen; /* length of name value (no null) */ 52 __uint8_t valuelen; /* length of value */ 53 __uint8_t flags; /* flags bits (see xfs_attr_leaf.h) */ 54 xfs_dahash_t hash; /* this entry's hash value */ 55 unsigned char *name; /* name value, pointer into buffer */ 56 } xfs_attr_sf_sort_t; 57 58 #define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen) /* space name/value uses */ \ 59 (((int)sizeof(xfs_attr_sf_entry_t)-1 + (nlen)+(vlen))) 60 #define XFS_ATTR_SF_ENTSIZE_MAX /* max space for name&value */ \ 61 ((1 << (NBBY*(int)sizeof(__uint8_t))) - 1) 62 #define XFS_ATTR_SF_ENTSIZE(sfep) /* space an entry uses */ \ 63 ((int)sizeof(xfs_attr_sf_entry_t)-1 + (sfep)->namelen+(sfep)->valuelen) 64 #define XFS_ATTR_SF_NEXTENTRY(sfep) /* next entry in struct */ \ 65 ((xfs_attr_sf_entry_t *)((char *)(sfep) + XFS_ATTR_SF_ENTSIZE(sfep))) 66 #define XFS_ATTR_SF_TOTSIZE(dp) /* total space in use */ \ 67 (be16_to_cpu(((xfs_attr_shortform_t *) \ 68 ((dp)->i_afp->if_u1.if_data))->hdr.totsize)) 69 70 #endif /* __XFS_ATTR_SF_H__ */ 71