4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * changes by Thomas Schoebel-Theuer
8 #include <linux/time.h>
10 #include <linux/string.h>
11 #include <linux/smp_lock.h>
12 #include <linux/dnotify.h>
13 #include <linux/fcntl.h>
14 #include <linux/quotaops.h>
15 #include <linux/security.h>
17 /* Taken over from the old code... */
19 /* POSIX UID/GID verification for setting inode attributes. */
20 int inode_change_ok(struct inode
*inode
, struct iattr
*attr
)
23 unsigned int ia_valid
= attr
->ia_valid
;
25 /* If force is set do it anyway. */
26 if (ia_valid
& ATTR_FORCE
)
29 /* Make sure a caller can chown. */
30 if ((ia_valid
& ATTR_UID
) &&
31 (current
->fsuid
!= inode
->i_uid
||
32 attr
->ia_uid
!= inode
->i_uid
) && !capable(CAP_CHOWN
))
35 /* Make sure caller can chgrp. */
36 if ((ia_valid
& ATTR_GID
) &&
37 (!in_group_p(attr
->ia_gid
) && attr
->ia_gid
!= inode
->i_gid
) &&
41 /* Make sure a caller can chmod. */
42 if (ia_valid
& ATTR_MODE
) {
43 if ((current
->fsuid
!= inode
->i_uid
) && !capable(CAP_FOWNER
))
45 /* Also check the setgid bit! */
46 if (!in_group_p((ia_valid
& ATTR_GID
) ? attr
->ia_gid
:
47 inode
->i_gid
) && !capable(CAP_FSETID
))
48 attr
->ia_mode
&= ~S_ISGID
;
51 /* Check for setting the inode time. */
52 if (ia_valid
& (ATTR_MTIME_SET
| ATTR_ATIME_SET
)) {
53 if (current
->fsuid
!= inode
->i_uid
&& !capable(CAP_FOWNER
))
62 int inode_setattr(struct inode
* inode
, struct iattr
* attr
)
64 unsigned int ia_valid
= attr
->ia_valid
;
67 if (ia_valid
& ATTR_SIZE
) {
68 if (attr
->ia_size
!= i_size_read(inode
)) {
69 error
= vmtruncate(inode
, attr
->ia_size
);
70 if (error
|| (ia_valid
== ATTR_SIZE
))
74 * We skipped the truncate but must still update
77 ia_valid
|= ATTR_MTIME
|ATTR_CTIME
;
81 if (ia_valid
& ATTR_UID
)
82 inode
->i_uid
= attr
->ia_uid
;
83 if (ia_valid
& ATTR_GID
)
84 inode
->i_gid
= attr
->ia_gid
;
85 if (ia_valid
& ATTR_ATIME
)
86 inode
->i_atime
= attr
->ia_atime
;
87 if (ia_valid
& ATTR_MTIME
)
88 inode
->i_mtime
= attr
->ia_mtime
;
89 if (ia_valid
& ATTR_CTIME
)
90 inode
->i_ctime
= attr
->ia_ctime
;
91 if (ia_valid
& ATTR_MODE
) {
92 umode_t mode
= attr
->ia_mode
;
94 if (!in_group_p(inode
->i_gid
) && !capable(CAP_FSETID
))
98 mark_inode_dirty(inode
);
103 int setattr_mask(unsigned int ia_valid
)
105 unsigned long dn_mask
= 0;
107 if (ia_valid
& ATTR_UID
)
108 dn_mask
|= DN_ATTRIB
;
109 if (ia_valid
& ATTR_GID
)
110 dn_mask
|= DN_ATTRIB
;
111 if (ia_valid
& ATTR_SIZE
)
112 dn_mask
|= DN_MODIFY
;
113 /* both times implies a utime(s) call */
114 if ((ia_valid
& (ATTR_ATIME
|ATTR_MTIME
)) == (ATTR_ATIME
|ATTR_MTIME
))
115 dn_mask
|= DN_ATTRIB
;
116 else if (ia_valid
& ATTR_ATIME
)
117 dn_mask
|= DN_ACCESS
;
118 else if (ia_valid
& ATTR_MTIME
)
119 dn_mask
|= DN_MODIFY
;
120 if (ia_valid
& ATTR_MODE
)
121 dn_mask
|= DN_ATTRIB
;
125 int notify_change(struct dentry
* dentry
, struct iattr
* attr
)
127 struct inode
*inode
= dentry
->d_inode
;
128 mode_t mode
= inode
->i_mode
;
130 struct timespec now
= CURRENT_TIME
;
131 unsigned int ia_valid
= attr
->ia_valid
;
136 attr
->ia_ctime
= now
;
137 if (!(ia_valid
& ATTR_ATIME_SET
))
138 attr
->ia_atime
= now
;
139 if (!(ia_valid
& ATTR_MTIME_SET
))
140 attr
->ia_mtime
= now
;
141 if (ia_valid
& ATTR_KILL_SUID
) {
142 attr
->ia_valid
&= ~ATTR_KILL_SUID
;
143 if (mode
& S_ISUID
) {
144 if (!(ia_valid
& ATTR_MODE
)) {
145 ia_valid
= attr
->ia_valid
|= ATTR_MODE
;
146 attr
->ia_mode
= inode
->i_mode
;
148 attr
->ia_mode
&= ~S_ISUID
;
151 if (ia_valid
& ATTR_KILL_SGID
) {
152 attr
->ia_valid
&= ~ ATTR_KILL_SGID
;
153 if ((mode
& (S_ISGID
| S_IXGRP
)) == (S_ISGID
| S_IXGRP
)) {
154 if (!(ia_valid
& ATTR_MODE
)) {
155 ia_valid
= attr
->ia_valid
|= ATTR_MODE
;
156 attr
->ia_mode
= inode
->i_mode
;
158 attr
->ia_mode
&= ~S_ISGID
;
164 if (inode
->i_op
&& inode
->i_op
->setattr
) {
165 error
= security_inode_setattr(dentry
, attr
);
167 error
= inode
->i_op
->setattr(dentry
, attr
);
169 error
= inode_change_ok(inode
, attr
);
171 error
= security_inode_setattr(dentry
, attr
);
173 if ((ia_valid
& ATTR_UID
&& attr
->ia_uid
!= inode
->i_uid
) ||
174 (ia_valid
& ATTR_GID
&& attr
->ia_gid
!= inode
->i_gid
))
175 error
= DQUOT_TRANSFER(inode
, attr
) ? -EDQUOT
: 0;
177 error
= inode_setattr(inode
, attr
);
181 unsigned long dn_mask
= setattr_mask(ia_valid
);
183 dnotify_parent(dentry
, dn_mask
);