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/dnotify.h>
14 #include <linux/fcntl.h>
15 #include <linux/quotaops.h>
16 #include <linux/security.h>
18 /* Taken over from the old code... */
20 /* POSIX UID/GID verification for setting inode attributes. */
21 int inode_change_ok(struct inode *inode, struct iattr *attr)
24 unsigned int ia_valid = attr->ia_valid;
26 /* If force is set do it anyway. */
27 if (ia_valid & ATTR_FORCE)
30 /* Make sure a caller can chown. */
31 if ((ia_valid & ATTR_UID) &&
32 (current->fsuid != inode->i_uid ||
33 attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
36 /* Make sure caller can chgrp. */
37 if ((ia_valid & ATTR_GID) &&
38 (current->fsuid != inode->i_uid ||
39 (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
43 /* Make sure a caller can chmod. */
44 if (ia_valid & ATTR_MODE) {
45 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
47 /* Also check the setgid bit! */
48 if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
49 inode->i_gid) && !capable(CAP_FSETID))
50 attr->ia_mode &= ~S_ISGID;
53 /* Check for setting the inode time. */
54 if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
55 if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
64 EXPORT_SYMBOL(inode_change_ok);
66 int inode_setattr_flags(struct inode *inode, unsigned int flags)
68 unsigned int oldflags, newflags;
70 oldflags = inode->i_flags;
71 newflags = oldflags & ~(S_IMMUTABLE | S_IUNLINK | S_BARRIER);
72 if (flags & ATTR_FLAG_IMMUTABLE)
73 newflags |= S_IMMUTABLE;
74 if (flags & ATTR_FLAG_IUNLINK)
75 newflags |= S_IUNLINK;
76 if (flags & ATTR_FLAG_BARRIER)
77 newflags |= S_BARRIER;
79 if (oldflags ^ newflags)
80 inode->i_flags = newflags;
84 int inode_setattr(struct inode * inode, struct iattr * attr)
86 unsigned int ia_valid = attr->ia_valid;
89 if (ia_valid & ATTR_SIZE) {
90 if (attr->ia_size != i_size_read(inode)) {
91 error = vmtruncate(inode, attr->ia_size);
92 if (error || (ia_valid == ATTR_SIZE))
96 * We skipped the truncate but must still update
99 ia_valid |= ATTR_MTIME|ATTR_CTIME;
103 if (ia_valid & ATTR_UID)
104 inode->i_uid = attr->ia_uid;
105 if (ia_valid & ATTR_GID)
106 inode->i_gid = attr->ia_gid;
107 if (ia_valid & ATTR_ATIME)
108 inode->i_atime = attr->ia_atime;
109 if (ia_valid & ATTR_MTIME)
110 inode->i_mtime = attr->ia_mtime;
111 if (ia_valid & ATTR_CTIME)
112 inode->i_ctime = attr->ia_ctime;
113 if (ia_valid & ATTR_MODE) {
114 umode_t mode = attr->ia_mode;
116 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
118 inode->i_mode = mode;
120 if (ia_valid & ATTR_ATTR_FLAG)
121 inode_setattr_flags(inode, attr->ia_attr_flags);
122 mark_inode_dirty(inode);
127 EXPORT_SYMBOL(inode_setattr);
129 int setattr_mask(unsigned int ia_valid)
131 unsigned long dn_mask = 0;
133 if (ia_valid & ATTR_UID)
134 dn_mask |= DN_ATTRIB;
135 if (ia_valid & ATTR_GID)
136 dn_mask |= DN_ATTRIB;
137 if (ia_valid & ATTR_SIZE)
138 dn_mask |= DN_MODIFY;
139 /* both times implies a utime(s) call */
140 if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
141 dn_mask |= DN_ATTRIB;
142 else if (ia_valid & ATTR_ATIME)
143 dn_mask |= DN_ACCESS;
144 else if (ia_valid & ATTR_MTIME)
145 dn_mask |= DN_MODIFY;
146 if (ia_valid & ATTR_MODE)
147 dn_mask |= DN_ATTRIB;
151 int notify_change(struct dentry * dentry, struct iattr * attr)
153 struct inode *inode = dentry->d_inode;
154 mode_t mode = inode->i_mode;
156 struct timespec now = CURRENT_TIME;
157 unsigned int ia_valid = attr->ia_valid;
162 attr->ia_ctime = now;
163 if (!(ia_valid & ATTR_ATIME_SET))
164 attr->ia_atime = now;
165 if (!(ia_valid & ATTR_MTIME_SET))
166 attr->ia_mtime = now;
167 if (ia_valid & ATTR_KILL_SUID) {
168 attr->ia_valid &= ~ATTR_KILL_SUID;
169 if (mode & S_ISUID) {
170 if (!(ia_valid & ATTR_MODE)) {
171 ia_valid = attr->ia_valid |= ATTR_MODE;
172 attr->ia_mode = inode->i_mode;
174 attr->ia_mode &= ~S_ISUID;
177 if (ia_valid & ATTR_KILL_SGID) {
178 attr->ia_valid &= ~ ATTR_KILL_SGID;
179 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
180 if (!(ia_valid & ATTR_MODE)) {
181 ia_valid = attr->ia_valid |= ATTR_MODE;
182 attr->ia_mode = inode->i_mode;
184 attr->ia_mode &= ~S_ISGID;
190 if (inode->i_op && inode->i_op->setattr) {
191 error = security_inode_setattr(dentry, attr);
193 error = inode->i_op->setattr(dentry, attr);
195 error = inode_change_ok(inode, attr);
197 error = security_inode_setattr(dentry, attr);
199 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
200 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
201 error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
203 error = inode_setattr(inode, attr);
207 unsigned long dn_mask = setattr_mask(ia_valid);
209 dnotify_parent(dentry, dn_mask);
214 EXPORT_SYMBOL(notify_change);