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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 | ||
ebabe9a9 | 10 | int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf) |
7ed1ee61 | 11 | { |
ebabe9a9 CH |
12 | int retval; |
13 | ||
14 | if (!dentry->d_sb->s_op->statfs) | |
15 | return -ENOSYS; | |
16 | ||
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; | |
7ed1ee61 AV |
24 | return retval; |
25 | } | |
26 | ||
ebabe9a9 CH |
27 | int vfs_statfs(struct path *path, struct kstatfs *buf) |
28 | { | |
29 | return statfs_by_dentry(path->dentry, buf); | |
30 | } | |
7ed1ee61 AV |
31 | EXPORT_SYMBOL(vfs_statfs); |
32 | ||
ebabe9a9 | 33 | static int do_statfs_native(struct path *path, struct statfs *buf) |
7ed1ee61 AV |
34 | { |
35 | struct kstatfs st; | |
36 | int retval; | |
37 | ||
ebabe9a9 | 38 | retval = vfs_statfs(path, &st); |
7ed1ee61 AV |
39 | if (retval) |
40 | return retval; | |
41 | ||
42 | if (sizeof(*buf) == sizeof(st)) | |
43 | memcpy(buf, &st, sizeof(st)); | |
44 | else { | |
45 | if (sizeof buf->f_blocks == 4) { | |
46 | if ((st.f_blocks | st.f_bfree | st.f_bavail | | |
47 | st.f_bsize | st.f_frsize) & | |
48 | 0xffffffff00000000ULL) | |
49 | return -EOVERFLOW; | |
50 | /* | |
51 | * f_files and f_ffree may be -1; it's okay to stuff | |
52 | * that into 32 bits | |
53 | */ | |
54 | if (st.f_files != -1 && | |
55 | (st.f_files & 0xffffffff00000000ULL)) | |
56 | return -EOVERFLOW; | |
57 | if (st.f_ffree != -1 && | |
58 | (st.f_ffree & 0xffffffff00000000ULL)) | |
59 | return -EOVERFLOW; | |
60 | } | |
61 | ||
62 | buf->f_type = st.f_type; | |
63 | buf->f_bsize = st.f_bsize; | |
64 | buf->f_blocks = st.f_blocks; | |
65 | buf->f_bfree = st.f_bfree; | |
66 | buf->f_bavail = st.f_bavail; | |
67 | buf->f_files = st.f_files; | |
68 | buf->f_ffree = st.f_ffree; | |
69 | buf->f_fsid = st.f_fsid; | |
70 | buf->f_namelen = st.f_namelen; | |
71 | buf->f_frsize = st.f_frsize; | |
72 | memset(buf->f_spare, 0, sizeof(buf->f_spare)); | |
73 | } | |
74 | return 0; | |
75 | } | |
76 | ||
ebabe9a9 | 77 | static int do_statfs64(struct path *path, struct statfs64 *buf) |
7ed1ee61 AV |
78 | { |
79 | struct kstatfs st; | |
80 | int retval; | |
81 | ||
ebabe9a9 | 82 | retval = vfs_statfs(path, &st); |
7ed1ee61 AV |
83 | if (retval) |
84 | return retval; | |
85 | ||
86 | if (sizeof(*buf) == sizeof(st)) | |
87 | memcpy(buf, &st, sizeof(st)); | |
88 | else { | |
89 | buf->f_type = st.f_type; | |
90 | buf->f_bsize = st.f_bsize; | |
91 | buf->f_blocks = st.f_blocks; | |
92 | buf->f_bfree = st.f_bfree; | |
93 | buf->f_bavail = st.f_bavail; | |
94 | buf->f_files = st.f_files; | |
95 | buf->f_ffree = st.f_ffree; | |
96 | buf->f_fsid = st.f_fsid; | |
97 | buf->f_namelen = st.f_namelen; | |
98 | buf->f_frsize = st.f_frsize; | |
99 | memset(buf->f_spare, 0, sizeof(buf->f_spare)); | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf) | |
105 | { | |
106 | struct path path; | |
107 | int error; | |
108 | ||
109 | error = user_path(pathname, &path); | |
110 | if (!error) { | |
111 | struct statfs tmp; | |
ebabe9a9 | 112 | error = do_statfs_native(&path, &tmp); |
7ed1ee61 AV |
113 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
114 | error = -EFAULT; | |
115 | path_put(&path); | |
116 | } | |
117 | return error; | |
118 | } | |
119 | ||
120 | SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf) | |
121 | { | |
122 | struct path path; | |
123 | long error; | |
124 | ||
125 | if (sz != sizeof(*buf)) | |
126 | return -EINVAL; | |
127 | error = user_path(pathname, &path); | |
128 | if (!error) { | |
129 | struct statfs64 tmp; | |
ebabe9a9 | 130 | error = do_statfs64(&path, &tmp); |
7ed1ee61 AV |
131 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
132 | error = -EFAULT; | |
133 | path_put(&path); | |
134 | } | |
135 | return error; | |
136 | } | |
137 | ||
138 | SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf) | |
139 | { | |
140 | struct file *file; | |
141 | struct statfs tmp; | |
142 | int error; | |
143 | ||
144 | error = -EBADF; | |
145 | file = fget(fd); | |
146 | if (!file) | |
147 | goto out; | |
ebabe9a9 | 148 | error = do_statfs_native(&file->f_path, &tmp); |
7ed1ee61 AV |
149 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
150 | error = -EFAULT; | |
151 | fput(file); | |
152 | out: | |
153 | return error; | |
154 | } | |
155 | ||
156 | SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf) | |
157 | { | |
158 | struct file *file; | |
159 | struct statfs64 tmp; | |
160 | int error; | |
161 | ||
162 | if (sz != sizeof(*buf)) | |
163 | return -EINVAL; | |
164 | ||
165 | error = -EBADF; | |
166 | file = fget(fd); | |
167 | if (!file) | |
168 | goto out; | |
ebabe9a9 | 169 | error = do_statfs64(&file->f_path, &tmp); |
7ed1ee61 AV |
170 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
171 | error = -EFAULT; | |
172 | fput(file); | |
173 | out: | |
174 | return error; | |
175 | } | |
176 | ||
177 | SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) | |
178 | { | |
179 | struct super_block *s; | |
180 | struct ustat tmp; | |
181 | struct kstatfs sbuf; | |
182 | int err; | |
183 | ||
184 | s = user_get_super(new_decode_dev(dev)); | |
185 | if (!s) | |
186 | return -EINVAL; | |
187 | ||
ebabe9a9 | 188 | err = statfs_by_dentry(s->s_root, &sbuf); |
7ed1ee61 AV |
189 | drop_super(s); |
190 | if (err) | |
191 | return err; | |
192 | ||
193 | memset(&tmp,0,sizeof(struct ustat)); | |
194 | tmp.f_tfree = sbuf.f_bfree; | |
195 | tmp.f_tinode = sbuf.f_ffree; | |
196 | ||
197 | return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0; | |
198 | } |