fs/xfs/libxfs/xfs_attr_sf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_ATTR_SF_H__
   7 #define __XFS_ATTR_SF_H__
   8
   9 /*
  10  * Attribute storage when stored inside the inode.
  11  *
  12  * Small attribute lists are packed as tightly as possible so as
  13  * to fit into the literal area of the inode.
  14  */
  15 typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
  16
  17 /*
  18  * We generate this then sort it, attr_list() must return things in hash-order.
  19  */
  20 typedef struct xfs_attr_sf_sort {
  21         uint8_t         entno;          /* entry number in original list */
  22         uint8_t         namelen;        /* length of name value (no null) */
  23         uint8_t         valuelen;       /* length of value */
  24         uint8_t         flags;          /* flags bits (see xfs_attr_leaf.h) */
  25         xfs_dahash_t    hash;           /* this entry's hash value */
  26         unsigned char   *name;          /* name value, pointer into buffer */
  27 } xfs_attr_sf_sort_t;
  28
  29 #define XFS_ATTR_SF_ENTSIZE_MAX                 /* max space for name&value */ \
  30         ((1 << (NBBY*(int)sizeof(uint8_t))) - 1)
  31
  32 /* space name/value uses */
  33 static inline int xfs_attr_sf_entsize_byname(uint8_t nlen, uint8_t vlen)
  34 {
  35         return sizeof(struct xfs_attr_sf_entry) + nlen + vlen;
  36 }
  37
  38 /* space an entry uses */
  39 static inline int xfs_attr_sf_entsize(struct xfs_attr_sf_entry *sfep)
  40 {
  41         return struct_size(sfep, nameval, sfep->namelen + sfep->valuelen);
  42 }
  43
  44 /* next entry in struct */
  45 static inline struct xfs_attr_sf_entry *
  46 xfs_attr_sf_nextentry(struct xfs_attr_sf_entry *sfep)
  47 {
  48         return (void *)sfep + xfs_attr_sf_entsize(sfep);
  49 }
  50
  51 #endif  /* __XFS_ATTR_SF_H__ */