linux/fs/gfs2/xattr.h
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __EATTR_DOT_H__
  11#define __EATTR_DOT_H__
  12
  13struct gfs2_inode;
  14struct iattr;
  15
  16#define GFS2_EA_REC_LEN(ea) be32_to_cpu((ea)->ea_rec_len)
  17#define GFS2_EA_DATA_LEN(ea) be32_to_cpu((ea)->ea_data_len)
  18
  19#define GFS2_EA_SIZE(ea) \
  20ALIGN(sizeof(struct gfs2_ea_header) + (ea)->ea_name_len + \
  21      ((GFS2_EA_IS_STUFFED(ea)) ? GFS2_EA_DATA_LEN(ea) : \
  22                                  (sizeof(__be64) * (ea)->ea_num_ptrs)), 8)
  23
  24#define GFS2_EA_IS_STUFFED(ea) (!(ea)->ea_num_ptrs)
  25#define GFS2_EA_IS_LAST(ea) ((ea)->ea_flags & GFS2_EAFLAG_LAST)
  26
  27#define GFS2_EAREQ_SIZE_STUFFED(er) \
  28ALIGN(sizeof(struct gfs2_ea_header) + (er)->er_name_len + (er)->er_data_len, 8)
  29
  30#define GFS2_EA2NAME(ea) ((char *)((struct gfs2_ea_header *)(ea) + 1))
  31#define GFS2_EA2DATA(ea) (GFS2_EA2NAME(ea) + (ea)->ea_name_len)
  32
  33#define GFS2_EA2DATAPTRS(ea) \
  34((__be64 *)(GFS2_EA2NAME(ea) + ALIGN((ea)->ea_name_len, 8)))
  35
  36#define GFS2_EA2NEXT(ea) \
  37((struct gfs2_ea_header *)((char *)(ea) + GFS2_EA_REC_LEN(ea)))
  38
  39#define GFS2_EA_BH2FIRST(bh) \
  40((struct gfs2_ea_header *)((bh)->b_data + sizeof(struct gfs2_meta_header)))
  41
  42struct gfs2_ea_request {
  43        const char *er_name;
  44        char *er_data;
  45        unsigned int er_name_len;
  46        unsigned int er_data_len;
  47        unsigned int er_type; /* GFS2_EATYPE_... */
  48};
  49
  50struct gfs2_ea_location {
  51        struct buffer_head *el_bh;
  52        struct gfs2_ea_header *el_ea;
  53        struct gfs2_ea_header *el_prev;
  54};
  55
  56extern int __gfs2_xattr_set(struct inode *inode, const char *name,
  57                            const void *value, size_t size,
  58                            int flags, int type);
  59extern ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size);
  60extern int gfs2_ea_dealloc(struct gfs2_inode *ip);
  61
  62/* Exported to acl.c */
  63
  64extern int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **data);
  65extern int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data);
  66
  67#endif /* __EATTR_DOT_H__ */
  68
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