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  * We generate this then sort it, attr_list() must return things in hash-order.
  11  */
  12 typedef struct xfs_attr_sf_sort {
  13         uint8_t         entno;          /* entry number in original list */
  14         uint8_t         namelen;        /* length of name value (no null) */
  15         uint8_t         valuelen;       /* length of value */
  16         uint8_t         flags;          /* flags bits (see xfs_attr_leaf.h) */
  17         xfs_dahash_t    hash;           /* this entry's hash value */
  18         unsigned char   *name;          /* name value, pointer into buffer */
  19         void            *value;
  20 } xfs_attr_sf_sort_t;
  21
  22 #define XFS_ATTR_SF_ENTSIZE_MAX                 /* max space for name&value */ \
  23         ((1 << (NBBY*(int)sizeof(uint8_t))) - 1)
  24
  25 /* space name/value uses */
  26 static inline int xfs_attr_sf_entsize_byname(uint8_t nlen, uint8_t vlen)
  27 {
  28         return sizeof(struct xfs_attr_sf_entry) + nlen + vlen;
  29 }
  30
  31 /* space an entry uses */
  32 static inline int xfs_attr_sf_entsize(struct xfs_attr_sf_entry *sfep)
  33 {
  34         return struct_size(sfep, nameval, sfep->namelen + sfep->valuelen);
  35 }
  36
  37 /* first entry in the SF attr fork */
  38 static inline struct xfs_attr_sf_entry *
  39 xfs_attr_sf_firstentry(struct xfs_attr_sf_hdr *hdr)
  40 {
  41         return (struct xfs_attr_sf_entry *)(hdr + 1);
  42 }
  43
  44 /* next entry after sfep */
  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 /* pointer to the space after the last entry, e.g. for adding a new one */
  52 static inline struct xfs_attr_sf_entry *
  53 xfs_attr_sf_endptr(struct xfs_attr_sf_hdr *sf)
  54 {
  55         return (void *)sf + be16_to_cpu(sf->totsize);
  56 }
  57
  58 #endif  /* __XFS_ATTR_SF_H__ */