Only load name if read succeeds
[yaffs2.git] / yaffs_attribs.c
1 /*
2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3  *
4  * Copyright (C) 2002-2018 Aleph One Ltd.
5  *
6  * Created by Charles Manning <charles@aleph1.co.uk>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include "yaffs_guts.h"
14 #include "yaffs_attribs.h"
15
16 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
17 #define IATTR_UID ia_uid
18 #define IATTR_GID ia_gid
19 #else
20 #define IATTR_UID ia_uid.val
21 #define IATTR_GID ia_gid.val
22 #endif
23
24 /*
25  * Loading attibs from/to object header assumes the object header
26  * is in cpu endian.
27  */
28 void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
29 {
30         obj->yst_uid = oh->yst_uid;
31         obj->yst_gid = oh->yst_gid;
32         obj->yst_atime = oh->yst_atime;
33         obj->yst_mtime = oh->yst_mtime;
34         obj->yst_ctime = oh->yst_ctime;
35         obj->yst_rdev = oh->yst_rdev;
36 }
37
38 void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
39 {
40         oh->yst_uid = obj->yst_uid;
41         oh->yst_gid = obj->yst_gid;
42         oh->yst_atime = obj->yst_atime;
43         oh->yst_mtime = obj->yst_mtime;
44         oh->yst_ctime = obj->yst_ctime;
45         oh->yst_rdev = obj->yst_rdev;
46
47 }
48
49 void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
50 {
51         obj->yst_mtime = Y_CURRENT_TIME;
52         if (do_a)
53                 obj->yst_atime = obj->yst_mtime;
54         if (do_c)
55                 obj->yst_ctime = obj->yst_mtime;
56 }
57
58 void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
59 {
60         yaffs_load_current_time(obj, 1, 1);
61         obj->yst_rdev = rdev;
62         obj->yst_uid = uid;
63         obj->yst_gid = gid;
64 }
65
66 static loff_t yaffs_get_file_size(struct yaffs_obj *obj)
67 {
68         YCHAR *alias = NULL;
69         obj = yaffs_get_equivalent_obj(obj);
70
71         switch (obj->variant_type) {
72         case YAFFS_OBJECT_TYPE_FILE:
73                 return obj->variant.file_variant.file_size;
74         case YAFFS_OBJECT_TYPE_SYMLINK:
75                 alias = obj->variant.symlink_variant.alias;
76                 if (!alias)
77                         return 0;
78                 return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
79         default:
80                 return 0;
81         }
82 }
83
84 int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
85 {
86         unsigned int valid = attr->ia_valid;
87
88         if (valid & ATTR_MODE)
89                 obj->yst_mode = attr->ia_mode;
90         if (valid & ATTR_UID)
91                 obj->yst_uid = attr->IATTR_UID;
92         if (valid & ATTR_GID)
93                 obj->yst_gid = attr->IATTR_GID;
94
95         if (valid & ATTR_ATIME)
96                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
97         if (valid & ATTR_CTIME)
98                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
99         if (valid & ATTR_MTIME)
100                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
101
102         if (valid & ATTR_SIZE)
103                 yaffs_resize_file(obj, attr->ia_size);
104
105         yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
106
107         return YAFFS_OK;
108
109 }
110
111 int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
112 {
113         unsigned int valid = 0;
114
115         attr->ia_mode = obj->yst_mode;
116         valid |= ATTR_MODE;
117         attr->IATTR_UID = obj->yst_uid;
118         valid |= ATTR_UID;
119         attr->IATTR_GID = obj->yst_gid;
120         valid |= ATTR_GID;
121
122         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
123         valid |= ATTR_ATIME;
124         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
125         valid |= ATTR_CTIME;
126         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
127         valid |= ATTR_MTIME;
128
129         attr->ia_size = yaffs_get_file_size(obj);
130         valid |= ATTR_SIZE;
131
132         attr->ia_valid = valid;
133
134         return YAFFS_OK;
135 }