target/linux/generic/files/fs/yaffs2/yaffs_attribs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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 #include "yaffs_guts.h"
  15 #include "yaffs_attribs.h"
  16
  17 void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
  18 {
  19         obj->yst_uid = oh->yst_uid;
  20         obj->yst_gid = oh->yst_gid;
  21         obj->yst_atime = oh->yst_atime;
  22         obj->yst_mtime = oh->yst_mtime;
  23         obj->yst_ctime = oh->yst_ctime;
  24         obj->yst_rdev = oh->yst_rdev;
  25 }
  26
  27 void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
  28 {
  29         oh->yst_uid = obj->yst_uid;
  30         oh->yst_gid = obj->yst_gid;
  31         oh->yst_atime = obj->yst_atime;
  32         oh->yst_mtime = obj->yst_mtime;
  33         oh->yst_ctime = obj->yst_ctime;
  34         oh->yst_rdev = obj->yst_rdev;
  35
  36 }
  37
  38 void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
  39 {
  40         obj->yst_mtime = Y_CURRENT_TIME;
  41         if (do_a)
  42                 obj->yst_atime = obj->yst_mtime;
  43         if (do_c)
  44                 obj->yst_ctime = obj->yst_mtime;
  45 }
  46
  47 void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
  48 {
  49         yaffs_load_current_time(obj, 1, 1);
  50         obj->yst_rdev = rdev;
  51         obj->yst_uid = uid;
  52         obj->yst_gid = gid;
  53 }
  54
  55 static loff_t yaffs_get_file_size(struct yaffs_obj *obj)
  56 {
  57         YCHAR *alias = NULL;
  58         obj = yaffs_get_equivalent_obj(obj);
  59
  60         switch (obj->variant_type) {
  61         case YAFFS_OBJECT_TYPE_FILE:
  62                 return obj->variant.file_variant.file_size;
  63         case YAFFS_OBJECT_TYPE_SYMLINK:
  64                 alias = obj->variant.symlink_variant.alias;
  65                 if (!alias)
  66                         return 0;
  67                 return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
  68         default:
  69                 return 0;
  70         }
  71 }
  72
  73 int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
  74 {
  75         unsigned int valid = attr->ia_valid;
  76
  77         if (valid & ATTR_MODE)
  78                 obj->yst_mode = attr->ia_mode;
  79         if (valid & ATTR_UID)
  80                 obj->yst_uid = attr->ia_uid;
  81         if (valid & ATTR_GID)
  82                 obj->yst_gid = attr->ia_gid;
  83
  84         if (valid & ATTR_ATIME)
  85                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
  86         if (valid & ATTR_CTIME)
  87                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
  88         if (valid & ATTR_MTIME)
  89                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
  90
  91         if (valid & ATTR_SIZE)
  92                 yaffs_resize_file(obj, attr->ia_size);
  93
  94         yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
  95
  96         return YAFFS_OK;
  97
  98 }
  99
 100 int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
 101 {
 102         unsigned int valid = 0;
 103
 104         attr->ia_mode = obj->yst_mode;
 105         valid |= ATTR_MODE;
 106         attr->ia_uid = obj->yst_uid;
 107         valid |= ATTR_UID;
 108         attr->ia_gid = obj->yst_gid;
 109         valid |= ATTR_GID;
 110
 111         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
 112         valid |= ATTR_ATIME;
 113         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
 114         valid |= ATTR_CTIME;
 115         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
 116         valid |= ATTR_MTIME;
 117
 118         attr->ia_size = yaffs_get_file_size(obj);
 119         valid |= ATTR_SIZE;
 120
 121         attr->ia_valid = valid;
 122
 123         return YAFFS_OK;
 124 }