LXR linux/fs/xfs/libxfs/xfs_attr

   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 */
  27typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
  28typedef struct xfs_attr_sf_entry xfs_attr_sf_entry_t;
  29
  30/*
  31 * We generate this then sort it, attr_list() must return things in hash-order.
  32 */
  33typedef struct xfs_attr_sf_sort {
  34        __uint8_t       entno;          /* entry number in original list */
  35        __uint8_t       namelen;        /* length of name value (no null) */
  36        __uint8_t       valuelen;       /* length of value */
  37        __uint8_t       flags;          /* flags bits (see xfs_attr_leaf.h) */
  38        xfs_dahash_t    hash;           /* this entry's hash value */
  39        unsigned char   *name;          /* name value, pointer into buffer */
  40} xfs_attr_sf_sort_t;
  41
  42#define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen)   /* space name/value uses */ \
  43        (((int)sizeof(xfs_attr_sf_entry_t)-1 + (nlen)+(vlen)))
  44#define XFS_ATTR_SF_ENTSIZE_MAX                 /* max space for name&value */ \
  45        ((1 << (NBBY*(int)sizeof(__uint8_t))) - 1)
  46#define XFS_ATTR_SF_ENTSIZE(sfep)               /* space an entry uses */ \
  47        ((int)sizeof(xfs_attr_sf_entry_t)-1 + (sfep)->namelen+(sfep)->valuelen)
  48#define XFS_ATTR_SF_NEXTENTRY(sfep)             /* next entry in struct */ \
  49        ((xfs_attr_sf_entry_t *)((char *)(sfep) + XFS_ATTR_SF_ENTSIZE(sfep)))
  50#define XFS_ATTR_SF_TOTSIZE(dp)                 /* total space in use */ \
  51        (be16_to_cpu(((xfs_attr_shortform_t *)  \
  52                ((dp)->i_afp->if_u1.if_data))->hdr.totsize))
  53
  54#endif  /* __XFS_ATTR_SF_H__ */
  55