fs/gfs2/xattr.h

   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
  13 struct gfs2_inode;
  14 struct 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) \
  20 ALIGN(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) \
  28 ALIGN(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
  42 struct 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
  50 struct 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
  56 extern int gfs2_xattr_get(struct inode *inode, int type, const char *name,
  57                           void *buffer, size_t size);
  58 extern int gfs2_xattr_set(struct inode *inode, int type, const char *name,
  59                           const void *value, size_t size, int flags);
  60 extern ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size);
  61 extern int gfs2_ea_dealloc(struct gfs2_inode *ip);
  62
  63 /* Exported to acl.c */
  64
  65 extern int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
  66                         struct gfs2_ea_location *el);
  67 extern int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
  68                             char *data, size_t size);
  69 extern int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
  70                              struct iattr *attr, char *data);
  71
  72 #endif /* __EATTR_DOT_H__ */