yaffs_attribs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14
  15 #include "yaffs_guts.h"
  16 #include "yaffs_attribs.h"
  17
  18 void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
  19 {
  20         obj->yst_uid = oh->yst_uid;
  21         obj->yst_gid = oh->yst_gid;
  22         obj->yst_atime = oh->yst_atime;
  23         obj->yst_mtime = oh->yst_mtime;
  24         obj->yst_ctime = oh->yst_ctime;
  25         obj->yst_rdev = oh->yst_rdev;
  26 }
  27
  28 void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
  29 {
  30         oh->yst_uid = obj->yst_uid;
  31         oh->yst_gid = obj->yst_gid;
  32         oh->yst_atime = obj->yst_atime;
  33         oh->yst_mtime = obj->yst_mtime;
  34         oh->yst_ctime = obj->yst_ctime;
  35         oh->yst_rdev = obj->yst_rdev;
  36
  37 }
  38
  39 void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
  40 {
  41         obj->yst_mtime = Y_CURRENT_TIME;
  42         if(do_a)
  43                 obj->yst_atime = obj->yst_atime;
  44         if(do_c)
  45                 obj->yst_ctime = obj->yst_atime;
  46 }
  47
  48 void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
  49 {
  50         yaffs_load_current_time(obj,1,1);
  51         obj->yst_rdev = rdev;
  52         obj->yst_uid = uid;
  53         obj->yst_gid = gid;
  54 }
  55
  56
  57 loff_t yaffs_get_file_size(struct yaffs_obj *obj)
  58 {
  59         YCHAR *alias = NULL;
  60         obj = yaffs_get_equivalent_obj(obj);
  61
  62         switch (obj->variant_type) {
  63         case YAFFS_OBJECT_TYPE_FILE:
  64                 return obj->variant.file_variant.file_size;
  65         case YAFFS_OBJECT_TYPE_SYMLINK:
  66                 alias = obj->variant.symlink_variant.alias;
  67                 if(!alias)
  68                         return 0;
  69                 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
  70         default:
  71                 return 0;
  72         }
  73 }
  74
  75 int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
  76 {
  77         unsigned int valid = attr->ia_valid;
  78
  79         if (valid & ATTR_MODE)
  80                 obj->yst_mode = attr->ia_mode;
  81         if (valid & ATTR_UID)
  82                 obj->yst_uid = attr->ia_uid;
  83         if (valid & ATTR_GID)
  84                 obj->yst_gid = attr->ia_gid;
  85
  86         if (valid & ATTR_ATIME)
  87                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
  88         if (valid & ATTR_CTIME)
  89                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
  90         if (valid & ATTR_MTIME)
  91                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
  92
  93         if (valid & ATTR_SIZE)
  94                 yaffs_resize_file(obj, attr->ia_size);
  95
  96         yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
  97
  98         return YAFFS_OK;
  99
 100 }
 101
 102 int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
 103 {
 104         unsigned int valid = 0;
 105
 106         attr->ia_mode = obj->yst_mode;
 107         valid |= ATTR_MODE;
 108         attr->ia_uid = obj->yst_uid;
 109         valid |= ATTR_UID;
 110         attr->ia_gid = obj->yst_gid;
 111         valid |= ATTR_GID;
 112
 113         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
 114         valid |= ATTR_ATIME;
 115         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
 116         valid |= ATTR_CTIME;
 117         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
 118         valid |= ATTR_MTIME;
 119
 120         attr->ia_size = yaffs_get_file_size(obj);
 121         valid |= ATTR_SIZE;
 122
 123         attr->ia_valid = valid;
 124
 125         return YAFFS_OK;
 126 }
 127
 128