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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
  18 #define IATTR_UID ia_uid
  19 #define IATTR_GID ia_gid
  20 #else
  21 #define IATTR_UID ia_uid.val
  22 #define IATTR_GID ia_gid.val
  23 #endif
  24
  25 void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
  26 {
  27         obj->yst_uid = oh->yst_uid;
  28         obj->yst_gid = oh->yst_gid;
  29         obj->yst_atime = oh->yst_atime;
  30         obj->yst_mtime = oh->yst_mtime;
  31         obj->yst_ctime = oh->yst_ctime;
  32         obj->yst_rdev = oh->yst_rdev;
  33 }
  34
  35 void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
  36 {
  37         oh->yst_uid = obj->yst_uid;
  38         oh->yst_gid = obj->yst_gid;
  39         oh->yst_atime = obj->yst_atime;
  40         oh->yst_mtime = obj->yst_mtime;
  41         oh->yst_ctime = obj->yst_ctime;
  42         oh->yst_rdev = obj->yst_rdev;
  43
  44 }
  45
  46 void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
  47 {
  48         obj->yst_mtime = Y_CURRENT_TIME;
  49         if (do_a)
  50                 obj->yst_atime = obj->yst_mtime;
  51         if (do_c)
  52                 obj->yst_ctime = obj->yst_mtime;
  53 }
  54
  55 void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
  56 {
  57         yaffs_load_current_time(obj, 1, 1);
  58         obj->yst_rdev = rdev;
  59         obj->yst_uid = uid;
  60         obj->yst_gid = gid;
  61 }
  62
  63 static loff_t yaffs_get_file_size(struct yaffs_obj *obj)
  64 {
  65         YCHAR *alias = NULL;
  66         obj = yaffs_get_equivalent_obj(obj);
  67
  68         switch (obj->variant_type) {
  69         case YAFFS_OBJECT_TYPE_FILE:
  70                 return obj->variant.file_variant.file_size;
  71         case YAFFS_OBJECT_TYPE_SYMLINK:
  72                 alias = obj->variant.symlink_variant.alias;
  73                 if (!alias)
  74                         return 0;
  75                 return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
  76         default:
  77                 return 0;
  78         }
  79 }
  80
  81 int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
  82 {
  83         unsigned int valid = attr->ia_valid;
  84
  85         if (valid & ATTR_MODE)
  86                 obj->yst_mode = attr->ia_mode;
  87         if (valid & ATTR_UID)
  88                 obj->yst_uid = attr->IATTR_UID;
  89         if (valid & ATTR_GID)
  90                 obj->yst_gid = attr->IATTR_GID;
  91
  92         if (valid & ATTR_ATIME)
  93                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
  94         if (valid & ATTR_CTIME)
  95                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
  96         if (valid & ATTR_MTIME)
  97                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
  98
  99         if (valid & ATTR_SIZE)
 100                 yaffs_resize_file(obj, attr->ia_size);
 101
 102         yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
 103
 104         return YAFFS_OK;
 105
 106 }
 107
 108 int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
 109 {
 110         unsigned int valid = 0;
 111
 112         attr->ia_mode = obj->yst_mode;
 113         valid |= ATTR_MODE;
 114         attr->IATTR_UID = obj->yst_uid;
 115         valid |= ATTR_UID;
 116         attr->IATTR_GID = obj->yst_gid;
 117         valid |= ATTR_GID;
 118
 119         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
 120         valid |= ATTR_ATIME;
 121         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
 122         valid |= ATTR_CTIME;
 123         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
 124         valid |= ATTR_MTIME;
 125
 126         attr->ia_size = yaffs_get_file_size(obj);
 127         valid |= ATTR_SIZE;
 128
 129         attr->ia_valid = valid;
 130
 131         return YAFFS_OK;
 132 }