fs/gfs2/eattr.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_EAREQ_SIZE_UNSTUFFED(sdp, er) \
  31 ALIGN(sizeof(struct gfs2_ea_header) + (er)->er_name_len + \
  32       sizeof(__be64) * DIV_ROUND_UP((er)->er_data_len, (sdp)->sd_jbsize), 8)
  33
  34 #define GFS2_EA2NAME(ea) ((char *)((struct gfs2_ea_header *)(ea) + 1))
  35 #define GFS2_EA2DATA(ea) (GFS2_EA2NAME(ea) + (ea)->ea_name_len)
  36
  37 #define GFS2_EA2DATAPTRS(ea) \
  38 ((__be64 *)(GFS2_EA2NAME(ea) + ALIGN((ea)->ea_name_len, 8)))
  39
  40 #define GFS2_EA2NEXT(ea) \
  41 ((struct gfs2_ea_header *)((char *)(ea) + GFS2_EA_REC_LEN(ea)))
  42
  43 #define GFS2_EA_BH2FIRST(bh) \
  44 ((struct gfs2_ea_header *)((bh)->b_data + sizeof(struct gfs2_meta_header)))
  45
  46 #define GFS2_ERF_MODE 0x80000000
  47
  48 struct gfs2_ea_request {
  49         const char *er_name;
  50         char *er_data;
  51         unsigned int er_name_len;
  52         unsigned int er_data_len;
  53         unsigned int er_type; /* GFS2_EATYPE_... */
  54         int er_flags;
  55         mode_t er_mode;
  56 };
  57
  58 struct gfs2_ea_location {
  59         struct buffer_head *el_bh;
  60         struct gfs2_ea_header *el_ea;
  61         struct gfs2_ea_header *el_prev;
  62 };
  63
  64 int gfs2_ea_get_i(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  65 int gfs2_ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  66 int gfs2_ea_remove_i(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  67
  68 int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  69 int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  70 int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  71 int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er);
  72
  73 int gfs2_ea_dealloc(struct gfs2_inode *ip);
  74
  75 /* Exported to acl.c */
  76
  77 int gfs2_ea_find(struct gfs2_inode *ip,
  78                  struct gfs2_ea_request *er,
  79                  struct gfs2_ea_location *el);
  80 int gfs2_ea_get_copy(struct gfs2_inode *ip,
  81                      struct gfs2_ea_location *el,
  82                      char *data);
  83 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
  84                       struct iattr *attr, char *data);
  85
  86 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
  87 {
  88         switch (ea->ea_type) {
  89         case GFS2_EATYPE_USR:
  90                 return 5 + ea->ea_name_len + 1;
  91         case GFS2_EATYPE_SYS:
  92                 return 7 + ea->ea_name_len + 1;
  93         case GFS2_EATYPE_SECURITY:
  94                 return 9 + ea->ea_name_len + 1;
  95         default:
  96                 return 0;
  97         }
  98 }
  99
 100 #endif /* __EATTR_DOT_H__ */