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_attribs.h"
  15
  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
  28 void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
  29 {
  30 #ifdef CONFIG_YAFFS_WINCE
  31                 oh->win_atime[0] = obj->win_atime[0];
  32                 oh->win_ctime[0] = obj->win_ctime[0];
  33                 oh->win_mtime[0] = obj->win_mtime[0];
  34                 oh->win_atime[1] = obj->win_atime[1];
  35                 oh->win_ctime[1] = obj->win_ctime[1];
  36                 oh->win_mtime[1] = obj->win_mtime[1];
  37 #else
  38                 oh->yst_uid = obj->yst_uid;
  39                 oh->yst_gid = obj->yst_gid;
  40                 oh->yst_atime = obj->yst_atime;
  41                 oh->yst_mtime = obj->yst_mtime;
  42                 oh->yst_ctime = obj->yst_ctime;
  43                 oh->yst_rdev = obj->yst_rdev;
  44 #endif
  45
  46 }
  47
  48 void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
  49 {
  50
  51 #ifdef CONFIG_YAFFS_WINCE
  52                 yfsd_win_file_time_now(obj->win_atime);
  53                 obj->win_ctime[0] = obj->win_mtime[0] = obj->win_atime[0];
  54                 obj->win_ctime[1] = obj->win_mtime[1] = obj->win_atime[1];
  55
  56 #else
  57         yaffs_load_current_time(obj, 1, 1);
  58         obj->yst_rdev = rdev;
  59         obj->yst_uid = uid;
  60         obj->yst_gid = gid;
  61 #endif
  62 }
  63
  64 void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
  65 {
  66 #ifdef CONFIG_YAFFS_WINCE
  67                 yfsd_win_file_time_now(the_obj->win_atime);
  68                 the_obj->win_ctime[0] = the_obj->win_mtime[0] =
  69                     the_obj->win_atime[0];
  70                 the_obj->win_ctime[1] = the_obj->win_mtime[1] =
  71                     the_obj->win_atime[1];
  72
  73 #else
  74
  75         obj->yst_mtime = Y_CURRENT_TIME;
  76         if (do_a)
  77                 obj->yst_atime = obj->yst_atime;
  78         if (do_c)
  79                 obj->yst_ctime = obj->yst_atime;
  80 #endif
  81 }
  82
  83 loff_t yaffs_get_file_size(struct yaffs_obj *obj)
  84 {
  85         YCHAR *alias = NULL;
  86         obj = yaffs_get_equivalent_obj(obj);
  87
  88         switch (obj->variant_type) {
  89         case YAFFS_OBJECT_TYPE_FILE:
  90                 return obj->variant.file_variant.file_size;
  91         case YAFFS_OBJECT_TYPE_SYMLINK:
  92                 alias = obj->variant.symlink_variant.alias;
  93                 if (!alias)
  94                         return 0;
  95                 return yaffs_strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
  96         default:
  97                 return 0;
  98         }
  99 }
 100
 101 int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
 102 {
 103         unsigned int valid = attr->ia_valid;
 104
 105         if (valid & ATTR_MODE)
 106                 obj->yst_mode = attr->ia_mode;
 107         if (valid & ATTR_UID)
 108                 obj->yst_uid = attr->ia_uid;
 109         if (valid & ATTR_GID)
 110                 obj->yst_gid = attr->ia_gid;
 111
 112         if (valid & ATTR_ATIME)
 113                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
 114         if (valid & ATTR_CTIME)
 115                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
 116         if (valid & ATTR_MTIME)
 117                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
 118
 119         if (valid & ATTR_SIZE)
 120                 yaffs_resize_file(obj, attr->ia_size);
 121
 122         yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
 123
 124         return YAFFS_OK;
 125
 126 }
 127
 128 int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
 129 {
 130         unsigned int valid = 0;
 131
 132         attr->ia_mode = obj->yst_mode;
 133         valid |= ATTR_MODE;
 134         attr->ia_uid = obj->yst_uid;
 135         valid |= ATTR_UID;
 136         attr->ia_gid = obj->yst_gid;
 137         valid |= ATTR_GID;
 138
 139         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
 140         valid |= ATTR_ATIME;
 141         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
 142         valid |= ATTR_CTIME;
 143         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
 144         valid |= ATTR_MTIME;
 145
 146         attr->ia_size = yaffs_get_file_size(obj);
 147         valid |= ATTR_SIZE;
 148
 149         attr->ia_valid = valid;
 150
 151         return YAFFS_OK;
 152 }