diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/attr.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/attr.c')
-rw-r--r-- | fs/attr.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/fs/attr.c b/fs/attr.c new file mode 100644 index 00000000000..c3c76fe7834 --- /dev/null +++ b/fs/attr.c | |||
@@ -0,0 +1,208 @@ | |||
1 | /* | ||
2 | * linux/fs/attr.c | ||
3 | * | ||
4 | * Copyright (C) 1991, 1992 Linus Torvalds | ||
5 | * changes by Thomas Schoebel-Theuer | ||
6 | */ | ||
7 | |||
8 | #include <linux/module.h> | ||
9 | #include <linux/time.h> | ||
10 | #include <linux/mm.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> | ||
17 | #include <linux/time.h> | ||
18 | |||
19 | /* Taken over from the old code... */ | ||
20 | |||
21 | /* POSIX UID/GID verification for setting inode attributes. */ | ||
22 | int inode_change_ok(struct inode *inode, struct iattr *attr) | ||
23 | { | ||
24 | int retval = -EPERM; | ||
25 | unsigned int ia_valid = attr->ia_valid; | ||
26 | |||
27 | /* If force is set do it anyway. */ | ||
28 | if (ia_valid & ATTR_FORCE) | ||
29 | goto fine; | ||
30 | |||
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)) | ||
35 | goto error; | ||
36 | |||
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)) && | ||
41 | !capable(CAP_CHOWN)) | ||
42 | goto error; | ||
43 | |||
44 | /* Make sure a caller can chmod. */ | ||
45 | if (ia_valid & ATTR_MODE) { | ||
46 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | ||
47 | goto error; | ||
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; | ||
52 | } | ||
53 | |||
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)) | ||
57 | goto error; | ||
58 | } | ||
59 | fine: | ||
60 | retval = 0; | ||
61 | error: | ||
62 | return retval; | ||
63 | } | ||
64 | |||
65 | EXPORT_SYMBOL(inode_change_ok); | ||
66 | |||
67 | int inode_setattr(struct inode * inode, struct iattr * attr) | ||
68 | { | ||
69 | unsigned int ia_valid = attr->ia_valid; | ||
70 | int error = 0; | ||
71 | |||
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)) | ||
76 | goto out; | ||
77 | } else { | ||
78 | /* | ||
79 | * We skipped the truncate but must still update | ||
80 | * timestamps | ||
81 | */ | ||
82 | ia_valid |= ATTR_MTIME|ATTR_CTIME; | ||
83 | } | ||
84 | } | ||
85 | |||
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; | ||
101 | |||
102 | if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) | ||
103 | mode &= ~S_ISGID; | ||
104 | inode->i_mode = mode; | ||
105 | } | ||
106 | mark_inode_dirty(inode); | ||
107 | out: | ||
108 | return error; | ||
109 | } | ||
110 | |||
111 | EXPORT_SYMBOL(inode_setattr); | ||
112 | |||
113 | int setattr_mask(unsigned int ia_valid) | ||
114 | { | ||
115 | unsigned long dn_mask = 0; | ||
116 | |||
117 | if (ia_valid & ATTR_UID) | ||
118 | dn_mask |= DN_ATTRIB; | ||
119 | if (ia_valid & ATTR_GID) | ||
120 | dn_mask |= DN_ATTRIB; | ||
121 | if (ia_valid & ATTR_SIZE) | ||
122 | dn_mask |= DN_MODIFY; | ||
123 | /* both times implies a utime(s) call */ | ||
124 | if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME)) | ||
125 | dn_mask |= DN_ATTRIB; | ||
126 | else if (ia_valid & ATTR_ATIME) | ||
127 | dn_mask |= DN_ACCESS; | ||
128 | else if (ia_valid & ATTR_MTIME) | ||
129 | dn_mask |= DN_MODIFY; | ||
130 | if (ia_valid & ATTR_MODE) | ||
131 | dn_mask |= DN_ATTRIB; | ||
132 | return dn_mask; | ||
133 | } | ||
134 | |||
135 | int notify_change(struct dentry * dentry, struct iattr * attr) | ||
136 | { | ||
137 | struct inode *inode = dentry->d_inode; | ||
138 | mode_t mode; | ||
139 | int error; | ||
140 | struct timespec now; | ||
141 | unsigned int ia_valid = attr->ia_valid; | ||
142 | |||
143 | if (!inode) | ||
144 | BUG(); | ||
145 | |||
146 | mode = inode->i_mode; | ||
147 | now = current_fs_time(inode->i_sb); | ||
148 | |||
149 | attr->ia_ctime = now; | ||
150 | if (!(ia_valid & ATTR_ATIME_SET)) | ||
151 | attr->ia_atime = now; | ||
152 | if (!(ia_valid & ATTR_MTIME_SET)) | ||
153 | attr->ia_mtime = now; | ||
154 | if (ia_valid & ATTR_KILL_SUID) { | ||
155 | attr->ia_valid &= ~ATTR_KILL_SUID; | ||
156 | if (mode & S_ISUID) { | ||
157 | if (!(ia_valid & ATTR_MODE)) { | ||
158 | ia_valid = attr->ia_valid |= ATTR_MODE; | ||
159 | attr->ia_mode = inode->i_mode; | ||
160 | } | ||
161 | attr->ia_mode &= ~S_ISUID; | ||
162 | } | ||
163 | } | ||
164 | if (ia_valid & ATTR_KILL_SGID) { | ||
165 | attr->ia_valid &= ~ ATTR_KILL_SGID; | ||
166 | if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { | ||
167 | if (!(ia_valid & ATTR_MODE)) { | ||
168 | ia_valid = attr->ia_valid |= ATTR_MODE; | ||
169 | attr->ia_mode = inode->i_mode; | ||
170 | } | ||
171 | attr->ia_mode &= ~S_ISGID; | ||
172 | } | ||
173 | } | ||
174 | if (!attr->ia_valid) | ||
175 | return 0; | ||
176 | |||
177 | if (ia_valid & ATTR_SIZE) | ||
178 | down_write(&dentry->d_inode->i_alloc_sem); | ||
179 | |||
180 | if (inode->i_op && inode->i_op->setattr) { | ||
181 | error = security_inode_setattr(dentry, attr); | ||
182 | if (!error) | ||
183 | error = inode->i_op->setattr(dentry, attr); | ||
184 | } else { | ||
185 | error = inode_change_ok(inode, attr); | ||
186 | if (!error) | ||
187 | error = security_inode_setattr(dentry, attr); | ||
188 | if (!error) { | ||
189 | if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || | ||
190 | (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) | ||
191 | error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0; | ||
192 | if (!error) | ||
193 | error = inode_setattr(inode, attr); | ||
194 | } | ||
195 | } | ||
196 | |||
197 | if (ia_valid & ATTR_SIZE) | ||
198 | up_write(&dentry->d_inode->i_alloc_sem); | ||
199 | |||
200 | if (!error) { | ||
201 | unsigned long dn_mask = setattr_mask(ia_valid); | ||
202 | if (dn_mask) | ||
203 | dnotify_parent(dentry, dn_mask); | ||
204 | } | ||
205 | return error; | ||
206 | } | ||
207 | |||
208 | EXPORT_SYMBOL(notify_change); | ||