fs/xfs/libxfs/xfs_attr_sf.h

   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 typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
  28 typedef 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  */
  33 typedef 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__ */