-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) &
- 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;
-}
-
-asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf)
-{
- struct nameidata nd;
- int error;
-
- error = user_path_walk(path, &nd);
- if (!error) {
- struct statfs tmp;
- error = vfs_statfs_native(nd.dentry, &tmp);
- if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
- error = -EFAULT;
- path_release(&nd);
- }
- return error;
-}
-
-
-asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64 __user *buf)
-{
- struct nameidata nd;
- long error;
-
- if (sz != sizeof(*buf))
- return -EINVAL;
- error = user_path_walk(path, &nd);
- if (!error) {
- struct statfs64 tmp;
- error = vfs_statfs64(nd.dentry, &tmp);
- if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
- error = -EFAULT;
- path_release(&nd);
- }
- return error;
-}
-
-
-asmlinkage long sys_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_dentry, &tmp);
- if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
- error = -EFAULT;
- fput(file);
-out:
- return error;
-}
-
-asmlinkage long sys_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_dentry, &tmp);
- if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
- error = -EFAULT;
- fput(file);
-out:
- return error;
-}