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Source at commit b13e7eb172b6f08e5fc22da162bdde5fcde201b5 created 11 years 11 months ago. By Maarten ter Huurne, fbcon: Add 6x10 font | |
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1 | #include <linux/syscalls.h> |
2 | #include <linux/module.h> |
3 | #include <linux/fs.h> |
4 | #include <linux/file.h> |
5 | #include <linux/mount.h> |
6 | #include <linux/namei.h> |
7 | #include <linux/statfs.h> |
8 | #include <linux/security.h> |
9 | #include <linux/uaccess.h> |
10 | #include "internal.h" |
11 | |
12 | static int flags_by_mnt(int mnt_flags) |
13 | { |
14 | int flags = 0; |
15 | |
16 | if (mnt_flags & MNT_READONLY) |
17 | flags |= ST_RDONLY; |
18 | if (mnt_flags & MNT_NOSUID) |
19 | flags |= ST_NOSUID; |
20 | if (mnt_flags & MNT_NODEV) |
21 | flags |= ST_NODEV; |
22 | if (mnt_flags & MNT_NOEXEC) |
23 | flags |= ST_NOEXEC; |
24 | if (mnt_flags & MNT_NOATIME) |
25 | flags |= ST_NOATIME; |
26 | if (mnt_flags & MNT_NODIRATIME) |
27 | flags |= ST_NODIRATIME; |
28 | if (mnt_flags & MNT_RELATIME) |
29 | flags |= ST_RELATIME; |
30 | return flags; |
31 | } |
32 | |
33 | static int flags_by_sb(int s_flags) |
34 | { |
35 | int flags = 0; |
36 | if (s_flags & MS_SYNCHRONOUS) |
37 | flags |= ST_SYNCHRONOUS; |
38 | if (s_flags & MS_MANDLOCK) |
39 | flags |= ST_MANDLOCK; |
40 | return flags; |
41 | } |
42 | |
43 | static int calculate_f_flags(struct vfsmount *mnt) |
44 | { |
45 | return ST_VALID | flags_by_mnt(mnt->mnt_flags) | |
46 | flags_by_sb(mnt->mnt_sb->s_flags); |
47 | } |
48 | |
49 | static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf) |
50 | { |
51 | int retval; |
52 | |
53 | if (!dentry->d_sb->s_op->statfs) |
54 | return -ENOSYS; |
55 | |
56 | memset(buf, 0, sizeof(*buf)); |
57 | retval = security_sb_statfs(dentry); |
58 | if (retval) |
59 | return retval; |
60 | retval = dentry->d_sb->s_op->statfs(dentry, buf); |
61 | if (retval == 0 && buf->f_frsize == 0) |
62 | buf->f_frsize = buf->f_bsize; |
63 | return retval; |
64 | } |
65 | |
66 | int vfs_statfs(struct path *path, struct kstatfs *buf) |
67 | { |
68 | int error; |
69 | |
70 | error = statfs_by_dentry(path->dentry, buf); |
71 | if (!error) |
72 | buf->f_flags = calculate_f_flags(path->mnt); |
73 | return error; |
74 | } |
75 | EXPORT_SYMBOL(vfs_statfs); |
76 | |
77 | int user_statfs(const char __user *pathname, struct kstatfs *st) |
78 | { |
79 | struct path path; |
80 | int error = user_path_at(AT_FDCWD, pathname, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); |
81 | if (!error) { |
82 | error = vfs_statfs(&path, st); |
83 | path_put(&path); |
84 | } |
85 | return error; |
86 | } |
87 | |
88 | int fd_statfs(int fd, struct kstatfs *st) |
89 | { |
90 | struct file *file = fget(fd); |
91 | int error = -EBADF; |
92 | if (file) { |
93 | error = vfs_statfs(&file->f_path, st); |
94 | fput(file); |
95 | } |
96 | return error; |
97 | } |
98 | |
99 | static int do_statfs_native(struct kstatfs *st, struct statfs __user *p) |
100 | { |
101 | struct statfs buf; |
102 | |
103 | if (sizeof(buf) == sizeof(*st)) |
104 | memcpy(&buf, st, sizeof(*st)); |
105 | else { |
106 | if (sizeof buf.f_blocks == 4) { |
107 | if ((st->f_blocks | st->f_bfree | st->f_bavail | |
108 | st->f_bsize | st->f_frsize) & |
109 | 0xffffffff00000000ULL) |
110 | return -EOVERFLOW; |
111 | /* |
112 | * f_files and f_ffree may be -1; it's okay to stuff |
113 | * that into 32 bits |
114 | */ |
115 | if (st->f_files != -1 && |
116 | (st->f_files & 0xffffffff00000000ULL)) |
117 | return -EOVERFLOW; |
118 | if (st->f_ffree != -1 && |
119 | (st->f_ffree & 0xffffffff00000000ULL)) |
120 | return -EOVERFLOW; |
121 | } |
122 | |
123 | buf.f_type = st->f_type; |
124 | buf.f_bsize = st->f_bsize; |
125 | buf.f_blocks = st->f_blocks; |
126 | buf.f_bfree = st->f_bfree; |
127 | buf.f_bavail = st->f_bavail; |
128 | buf.f_files = st->f_files; |
129 | buf.f_ffree = st->f_ffree; |
130 | buf.f_fsid = st->f_fsid; |
131 | buf.f_namelen = st->f_namelen; |
132 | buf.f_frsize = st->f_frsize; |
133 | buf.f_flags = st->f_flags; |
134 | memset(buf.f_spare, 0, sizeof(buf.f_spare)); |
135 | } |
136 | if (copy_to_user(p, &buf, sizeof(buf))) |
137 | return -EFAULT; |
138 | return 0; |
139 | } |
140 | |
141 | static int do_statfs64(struct kstatfs *st, struct statfs64 __user *p) |
142 | { |
143 | struct statfs64 buf; |
144 | if (sizeof(buf) == sizeof(*st)) |
145 | memcpy(&buf, st, sizeof(*st)); |
146 | else { |
147 | buf.f_type = st->f_type; |
148 | buf.f_bsize = st->f_bsize; |
149 | buf.f_blocks = st->f_blocks; |
150 | buf.f_bfree = st->f_bfree; |
151 | buf.f_bavail = st->f_bavail; |
152 | buf.f_files = st->f_files; |
153 | buf.f_ffree = st->f_ffree; |
154 | buf.f_fsid = st->f_fsid; |
155 | buf.f_namelen = st->f_namelen; |
156 | buf.f_frsize = st->f_frsize; |
157 | buf.f_flags = st->f_flags; |
158 | memset(buf.f_spare, 0, sizeof(buf.f_spare)); |
159 | } |
160 | if (copy_to_user(p, &buf, sizeof(buf))) |
161 | return -EFAULT; |
162 | return 0; |
163 | } |
164 | |
165 | SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf) |
166 | { |
167 | struct kstatfs st; |
168 | int error = user_statfs(pathname, &st); |
169 | if (!error) |
170 | error = do_statfs_native(&st, buf); |
171 | return error; |
172 | } |
173 | |
174 | SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf) |
175 | { |
176 | struct kstatfs st; |
177 | int error; |
178 | if (sz != sizeof(*buf)) |
179 | return -EINVAL; |
180 | error = user_statfs(pathname, &st); |
181 | if (!error) |
182 | error = do_statfs64(&st, buf); |
183 | return error; |
184 | } |
185 | |
186 | SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf) |
187 | { |
188 | struct kstatfs st; |
189 | int error = fd_statfs(fd, &st); |
190 | if (!error) |
191 | error = do_statfs_native(&st, buf); |
192 | return error; |
193 | } |
194 | |
195 | SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf) |
196 | { |
197 | struct kstatfs st; |
198 | int error; |
199 | |
200 | if (sz != sizeof(*buf)) |
201 | return -EINVAL; |
202 | |
203 | error = fd_statfs(fd, &st); |
204 | if (!error) |
205 | error = do_statfs64(&st, buf); |
206 | return error; |
207 | } |
208 | |
209 | int vfs_ustat(dev_t dev, struct kstatfs *sbuf) |
210 | { |
211 | struct super_block *s = user_get_super(dev); |
212 | int err; |
213 | if (!s) |
214 | return -EINVAL; |
215 | |
216 | err = statfs_by_dentry(s->s_root, sbuf); |
217 | drop_super(s); |
218 | return err; |
219 | } |
220 | |
221 | SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) |
222 | { |
223 | struct ustat tmp; |
224 | struct kstatfs sbuf; |
225 | int err = vfs_ustat(new_decode_dev(dev), &sbuf); |
226 | if (err) |
227 | return err; |
228 | |
229 | memset(&tmp,0,sizeof(struct ustat)); |
230 | tmp.f_tfree = sbuf.f_bfree; |
231 | tmp.f_tinode = sbuf.f_ffree; |
232 | |
233 | return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0; |
234 | } |
235 |
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