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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/attr.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * changes by Thomas Schoebel-Theuer
8 #include <linux/module.h>
9 #include <linux/time.h>
11 #include <linux/string.h>
12 #include <linux/smp_lock.h>
13 #include <linux/fsnotify.h>
14 #include <linux/fcntl.h>
15 #include <linux/quotaops.h>
16 #include <linux/security.h>
17 #include <linux/time.h>
19 /* Taken over from the old code... */
21 /* POSIX UID/GID verification for setting inode attributes. */
22 int inode_change_ok(struct inode
*inode
, struct iattr
*attr
)
25 unsigned int ia_valid
= attr
->ia_valid
;
27 /* If force is set do it anyway. */
28 if (ia_valid
& ATTR_FORCE
)
31 /* Make sure a caller can chown. */
32 if ((ia_valid
& ATTR_UID
) &&
33 (current
->fsuid
!= inode
->i_uid
||
34 attr
->ia_uid
!= inode
->i_uid
) && !capable(CAP_CHOWN
))
37 /* Make sure caller can chgrp. */
38 if ((ia_valid
& ATTR_GID
) &&
39 (current
->fsuid
!= inode
->i_uid
||
40 (!in_group_p(attr
->ia_gid
) && attr
->ia_gid
!= inode
->i_gid
)) &&
44 /* Make sure a caller can chmod. */
45 if (ia_valid
& ATTR_MODE
) {
46 if ((current
->fsuid
!= inode
->i_uid
) && !capable(CAP_FOWNER
))
48 /* Also check the setgid bit! */
49 if (!in_group_p((ia_valid
& ATTR_GID
) ? attr
->ia_gid
:
50 inode
->i_gid
) && !capable(CAP_FSETID
))
51 attr
->ia_mode
&= ~S_ISGID
;
54 /* Check for setting the inode time. */
55 if (ia_valid
& (ATTR_MTIME_SET
| ATTR_ATIME_SET
)) {
56 if (current
->fsuid
!= inode
->i_uid
&& !capable(CAP_FOWNER
))
65 EXPORT_SYMBOL(inode_change_ok
);
67 int inode_setattr(struct inode
* inode
, struct iattr
* attr
)
69 unsigned int ia_valid
= attr
->ia_valid
;
72 if (ia_valid
& ATTR_SIZE
) {
73 if (attr
->ia_size
!= i_size_read(inode
)) {
74 error
= vmtruncate(inode
, attr
->ia_size
);
75 if (error
|| (ia_valid
== ATTR_SIZE
))
79 * We skipped the truncate but must still update
82 ia_valid
|= ATTR_MTIME
|ATTR_CTIME
;
86 if (ia_valid
& ATTR_UID
)
87 inode
->i_uid
= attr
->ia_uid
;
88 if (ia_valid
& ATTR_GID
)
89 inode
->i_gid
= attr
->ia_gid
;
90 if (ia_valid
& ATTR_ATIME
)
91 inode
->i_atime
= timespec_trunc(attr
->ia_atime
,
92 inode
->i_sb
->s_time_gran
);
93 if (ia_valid
& ATTR_MTIME
)
94 inode
->i_mtime
= timespec_trunc(attr
->ia_mtime
,
95 inode
->i_sb
->s_time_gran
);
96 if (ia_valid
& ATTR_CTIME
)
97 inode
->i_ctime
= timespec_trunc(attr
->ia_ctime
,
98 inode
->i_sb
->s_time_gran
);
99 if (ia_valid
& ATTR_MODE
) {
100 umode_t mode
= attr
->ia_mode
;
102 if (!in_group_p(inode
->i_gid
) && !capable(CAP_FSETID
))
104 inode
->i_mode
= mode
;
106 mark_inode_dirty(inode
);
110 EXPORT_SYMBOL(inode_setattr
);
112 int notify_change(struct dentry
* dentry
, struct iattr
* attr
)
114 struct inode
*inode
= dentry
->d_inode
;
118 unsigned int ia_valid
= attr
->ia_valid
;
123 mode
= inode
->i_mode
;
124 now
= current_fs_time(inode
->i_sb
);
126 attr
->ia_ctime
= now
;
127 if (!(ia_valid
& ATTR_ATIME_SET
))
128 attr
->ia_atime
= now
;
129 if (!(ia_valid
& ATTR_MTIME_SET
))
130 attr
->ia_mtime
= now
;
131 if (ia_valid
& ATTR_KILL_SUID
) {
132 attr
->ia_valid
&= ~ATTR_KILL_SUID
;
133 if (mode
& S_ISUID
) {
134 if (!(ia_valid
& ATTR_MODE
)) {
135 ia_valid
= attr
->ia_valid
|= ATTR_MODE
;
136 attr
->ia_mode
= inode
->i_mode
;
138 attr
->ia_mode
&= ~S_ISUID
;
141 if (ia_valid
& ATTR_KILL_SGID
) {
142 attr
->ia_valid
&= ~ ATTR_KILL_SGID
;
143 if ((mode
& (S_ISGID
| S_IXGRP
)) == (S_ISGID
| S_IXGRP
)) {
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_ISGID
;
154 if (ia_valid
& ATTR_SIZE
)
155 down_write(&dentry
->d_inode
->i_alloc_sem
);
157 if (inode
->i_op
&& inode
->i_op
->setattr
) {
158 error
= security_inode_setattr(dentry
, attr
);
160 error
= inode
->i_op
->setattr(dentry
, attr
);
162 error
= inode_change_ok(inode
, attr
);
164 error
= security_inode_setattr(dentry
, attr
);
166 if ((ia_valid
& ATTR_UID
&& attr
->ia_uid
!= inode
->i_uid
) ||
167 (ia_valid
& ATTR_GID
&& attr
->ia_gid
!= inode
->i_gid
))
168 error
= DQUOT_TRANSFER(inode
, attr
) ? -EDQUOT
: 0;
170 error
= inode_setattr(inode
, attr
);
174 if (ia_valid
& ATTR_SIZE
)
175 up_write(&dentry
->d_inode
->i_alloc_sem
);
178 fsnotify_change(dentry
, ia_valid
);
183 EXPORT_SYMBOL(notify_change
);