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Commit | Line | Data |
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7ed1ee61 AV |
1 | #include <linux/syscalls.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/fs.h> | |
4 | #include <linux/file.h> | |
5 | #include <linux/namei.h> | |
6 | #include <linux/statfs.h> | |
7 | #include <linux/security.h> | |
8 | #include <linux/uaccess.h> | |
9 | ||
10 | int vfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
11 | { | |
12 | int retval = -ENODEV; | |
13 | ||
14 | if (dentry) { | |
15 | retval = -ENOSYS; | |
16 | if (dentry->d_sb->s_op->statfs) { | |
17 | memset(buf, 0, sizeof(*buf)); | |
18 | retval = security_sb_statfs(dentry); | |
19 | if (retval) | |
20 | return retval; | |
21 | retval = dentry->d_sb->s_op->statfs(dentry, buf); | |
22 | if (retval == 0 && buf->f_frsize == 0) | |
23 | buf->f_frsize = buf->f_bsize; | |
24 | } | |
25 | } | |
26 | return retval; | |
27 | } | |
28 | ||
29 | EXPORT_SYMBOL(vfs_statfs); | |
30 | ||
31 | static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf) | |
32 | { | |
33 | struct kstatfs st; | |
34 | int retval; | |
35 | ||
36 | retval = vfs_statfs(dentry, &st); | |
37 | if (retval) | |
38 | return retval; | |
39 | ||
40 | if (sizeof(*buf) == sizeof(st)) | |
41 | memcpy(buf, &st, sizeof(st)); | |
42 | else { | |
43 | if (sizeof buf->f_blocks == 4) { | |
44 | if ((st.f_blocks | st.f_bfree | st.f_bavail | | |
45 | st.f_bsize | st.f_frsize) & | |
46 | 0xffffffff00000000ULL) | |
47 | return -EOVERFLOW; | |
48 | /* | |
49 | * f_files and f_ffree may be -1; it's okay to stuff | |
50 | * that into 32 bits | |
51 | */ | |
52 | if (st.f_files != -1 && | |
53 | (st.f_files & 0xffffffff00000000ULL)) | |
54 | return -EOVERFLOW; | |
55 | if (st.f_ffree != -1 && | |
56 | (st.f_ffree & 0xffffffff00000000ULL)) | |
57 | return -EOVERFLOW; | |
58 | } | |
59 | ||
60 | buf->f_type = st.f_type; | |
61 | buf->f_bsize = st.f_bsize; | |
62 | buf->f_blocks = st.f_blocks; | |
63 | buf->f_bfree = st.f_bfree; | |
64 | buf->f_bavail = st.f_bavail; | |
65 | buf->f_files = st.f_files; | |
66 | buf->f_ffree = st.f_ffree; | |
67 | buf->f_fsid = st.f_fsid; | |
68 | buf->f_namelen = st.f_namelen; | |
69 | buf->f_frsize = st.f_frsize; | |
70 | memset(buf->f_spare, 0, sizeof(buf->f_spare)); | |
71 | } | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf) | |
76 | { | |
77 | struct kstatfs st; | |
78 | int retval; | |
79 | ||
80 | retval = vfs_statfs(dentry, &st); | |
81 | if (retval) | |
82 | return retval; | |
83 | ||
84 | if (sizeof(*buf) == sizeof(st)) | |
85 | memcpy(buf, &st, sizeof(st)); | |
86 | else { | |
87 | buf->f_type = st.f_type; | |
88 | buf->f_bsize = st.f_bsize; | |
89 | buf->f_blocks = st.f_blocks; | |
90 | buf->f_bfree = st.f_bfree; | |
91 | buf->f_bavail = st.f_bavail; | |
92 | buf->f_files = st.f_files; | |
93 | buf->f_ffree = st.f_ffree; | |
94 | buf->f_fsid = st.f_fsid; | |
95 | buf->f_namelen = st.f_namelen; | |
96 | buf->f_frsize = st.f_frsize; | |
97 | memset(buf->f_spare, 0, sizeof(buf->f_spare)); | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
102 | SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf) | |
103 | { | |
104 | struct path path; | |
105 | int error; | |
106 | ||
107 | error = user_path(pathname, &path); | |
108 | if (!error) { | |
109 | struct statfs tmp; | |
110 | error = vfs_statfs_native(path.dentry, &tmp); | |
111 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | |
112 | error = -EFAULT; | |
113 | path_put(&path); | |
114 | } | |
115 | return error; | |
116 | } | |
117 | ||
118 | SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf) | |
119 | { | |
120 | struct path path; | |
121 | long error; | |
122 | ||
123 | if (sz != sizeof(*buf)) | |
124 | return -EINVAL; | |
125 | error = user_path(pathname, &path); | |
126 | if (!error) { | |
127 | struct statfs64 tmp; | |
128 | error = vfs_statfs64(path.dentry, &tmp); | |
129 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | |
130 | error = -EFAULT; | |
131 | path_put(&path); | |
132 | } | |
133 | return error; | |
134 | } | |
135 | ||
136 | SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf) | |
137 | { | |
138 | struct file *file; | |
139 | struct statfs tmp; | |
140 | int error; | |
141 | ||
142 | error = -EBADF; | |
143 | file = fget(fd); | |
144 | if (!file) | |
145 | goto out; | |
146 | error = vfs_statfs_native(file->f_path.dentry, &tmp); | |
147 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | |
148 | error = -EFAULT; | |
149 | fput(file); | |
150 | out: | |
151 | return error; | |
152 | } | |
153 | ||
154 | SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf) | |
155 | { | |
156 | struct file *file; | |
157 | struct statfs64 tmp; | |
158 | int error; | |
159 | ||
160 | if (sz != sizeof(*buf)) | |
161 | return -EINVAL; | |
162 | ||
163 | error = -EBADF; | |
164 | file = fget(fd); | |
165 | if (!file) | |
166 | goto out; | |
167 | error = vfs_statfs64(file->f_path.dentry, &tmp); | |
168 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | |
169 | error = -EFAULT; | |
170 | fput(file); | |
171 | out: | |
172 | return error; | |
173 | } | |
174 | ||
175 | SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) | |
176 | { | |
177 | struct super_block *s; | |
178 | struct ustat tmp; | |
179 | struct kstatfs sbuf; | |
180 | int err; | |
181 | ||
182 | s = user_get_super(new_decode_dev(dev)); | |
183 | if (!s) | |
184 | return -EINVAL; | |
185 | ||
186 | err = vfs_statfs(s->s_root, &sbuf); | |
187 | drop_super(s); | |
188 | if (err) | |
189 | return err; | |
190 | ||
191 | memset(&tmp,0,sizeof(struct ustat)); | |
192 | tmp.f_tfree = sbuf.f_bfree; | |
193 | tmp.f_tinode = sbuf.f_ffree; | |
194 | ||
195 | return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0; | |
196 | } |