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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Al Viro
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May 21, 2010
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| #include <linux/syscalls.h> | ||
| #include <linux/module.h> | ||
| #include <linux/fs.h> | ||
| #include <linux/file.h> | ||
| #include <linux/namei.h> | ||
| #include <linux/statfs.h> | ||
| #include <linux/security.h> | ||
| #include <linux/uaccess.h> | ||
|
|
||
| int vfs_statfs(struct dentry *dentry, struct kstatfs *buf) | ||
| { | ||
| int retval = -ENODEV; | ||
|
|
||
| if (dentry) { | ||
| retval = -ENOSYS; | ||
| if (dentry->d_sb->s_op->statfs) { | ||
| memset(buf, 0, sizeof(*buf)); | ||
| retval = security_sb_statfs(dentry); | ||
| if (retval) | ||
| return retval; | ||
| retval = dentry->d_sb->s_op->statfs(dentry, buf); | ||
| if (retval == 0 && buf->f_frsize == 0) | ||
| buf->f_frsize = buf->f_bsize; | ||
| } | ||
| } | ||
| return retval; | ||
| } | ||
|
|
||
| EXPORT_SYMBOL(vfs_statfs); | ||
|
|
||
| static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf) | ||
| { | ||
| struct kstatfs st; | ||
| int retval; | ||
|
|
||
| retval = vfs_statfs(dentry, &st); | ||
| if (retval) | ||
| return retval; | ||
|
|
||
| if (sizeof(*buf) == sizeof(st)) | ||
| memcpy(buf, &st, sizeof(st)); | ||
| else { | ||
| if (sizeof buf->f_blocks == 4) { | ||
| if ((st.f_blocks | st.f_bfree | st.f_bavail | | ||
| st.f_bsize | st.f_frsize) & | ||
| 0xffffffff00000000ULL) | ||
| return -EOVERFLOW; | ||
| /* | ||
| * f_files and f_ffree may be -1; it's okay to stuff | ||
| * that into 32 bits | ||
| */ | ||
| if (st.f_files != -1 && | ||
| (st.f_files & 0xffffffff00000000ULL)) | ||
| return -EOVERFLOW; | ||
| if (st.f_ffree != -1 && | ||
| (st.f_ffree & 0xffffffff00000000ULL)) | ||
| return -EOVERFLOW; | ||
| } | ||
|
|
||
| buf->f_type = st.f_type; | ||
| buf->f_bsize = st.f_bsize; | ||
| buf->f_blocks = st.f_blocks; | ||
| buf->f_bfree = st.f_bfree; | ||
| buf->f_bavail = st.f_bavail; | ||
| buf->f_files = st.f_files; | ||
| buf->f_ffree = st.f_ffree; | ||
| buf->f_fsid = st.f_fsid; | ||
| buf->f_namelen = st.f_namelen; | ||
| buf->f_frsize = st.f_frsize; | ||
| memset(buf->f_spare, 0, sizeof(buf->f_spare)); | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf) | ||
| { | ||
| struct kstatfs st; | ||
| int retval; | ||
|
|
||
| retval = vfs_statfs(dentry, &st); | ||
| if (retval) | ||
| return retval; | ||
|
|
||
| if (sizeof(*buf) == sizeof(st)) | ||
| memcpy(buf, &st, sizeof(st)); | ||
| else { | ||
| buf->f_type = st.f_type; | ||
| buf->f_bsize = st.f_bsize; | ||
| buf->f_blocks = st.f_blocks; | ||
| buf->f_bfree = st.f_bfree; | ||
| buf->f_bavail = st.f_bavail; | ||
| buf->f_files = st.f_files; | ||
| buf->f_ffree = st.f_ffree; | ||
| buf->f_fsid = st.f_fsid; | ||
| buf->f_namelen = st.f_namelen; | ||
| buf->f_frsize = st.f_frsize; | ||
| memset(buf->f_spare, 0, sizeof(buf->f_spare)); | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf) | ||
| { | ||
| struct path path; | ||
| int error; | ||
|
|
||
| error = user_path(pathname, &path); | ||
| if (!error) { | ||
| struct statfs tmp; | ||
| error = vfs_statfs_native(path.dentry, &tmp); | ||
| if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | ||
| error = -EFAULT; | ||
| path_put(&path); | ||
| } | ||
| return error; | ||
| } | ||
|
|
||
| SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf) | ||
| { | ||
| struct path path; | ||
| long error; | ||
|
|
||
| if (sz != sizeof(*buf)) | ||
| return -EINVAL; | ||
| error = user_path(pathname, &path); | ||
| if (!error) { | ||
| struct statfs64 tmp; | ||
| error = vfs_statfs64(path.dentry, &tmp); | ||
| if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | ||
| error = -EFAULT; | ||
| path_put(&path); | ||
| } | ||
| return error; | ||
| } | ||
|
|
||
| SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf) | ||
| { | ||
| struct file *file; | ||
| struct statfs tmp; | ||
| int error; | ||
|
|
||
| error = -EBADF; | ||
| file = fget(fd); | ||
| if (!file) | ||
| goto out; | ||
| error = vfs_statfs_native(file->f_path.dentry, &tmp); | ||
| if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | ||
| error = -EFAULT; | ||
| fput(file); | ||
| out: | ||
| return error; | ||
| } | ||
|
|
||
| SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf) | ||
| { | ||
| struct file *file; | ||
| struct statfs64 tmp; | ||
| int error; | ||
|
|
||
| if (sz != sizeof(*buf)) | ||
| return -EINVAL; | ||
|
|
||
| error = -EBADF; | ||
| file = fget(fd); | ||
| if (!file) | ||
| goto out; | ||
| error = vfs_statfs64(file->f_path.dentry, &tmp); | ||
| if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) | ||
| error = -EFAULT; | ||
| fput(file); | ||
| out: | ||
| return error; | ||
| } | ||
|
|
||
| SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) | ||
| { | ||
| struct super_block *s; | ||
| struct ustat tmp; | ||
| struct kstatfs sbuf; | ||
| int err; | ||
|
|
||
| s = user_get_super(new_decode_dev(dev)); | ||
| if (!s) | ||
| return -EINVAL; | ||
|
|
||
| err = vfs_statfs(s->s_root, &sbuf); | ||
| drop_super(s); | ||
| if (err) | ||
| return err; | ||
|
|
||
| memset(&tmp,0,sizeof(struct ustat)); | ||
| tmp.f_tfree = sbuf.f_bfree; | ||
| tmp.f_tinode = sbuf.f_ffree; | ||
|
|
||
| return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0; | ||
| } |
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