int vfs_statfs(struct path *path, struct kstatfs *buf)
{
int error;
error = statfs_by_dentry(path->dentry, buf);
if (!error)
buf->f_flags = calculate_f_flags(path->mnt);
return error;
}
int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
{
struct super_block *s = user_get_super(dev);
int err;
if (!s)
return -EINVAL;
err = statfs_by_dentry(s->s_root, sbuf);
drop_super(s);
return err;
}
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 = statfs_by_dentry(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;
}
int vfs_statfs(struct path *path, struct kstatfs *buf)
{
int error;
ktime_t statfs_t, statfs_diff;
char pathname[256], *statfs_path;
if (path) {
statfs_path = d_path(path, pathname, sizeof(pathname));
if (IS_ERR(statfs_path))
statfs_path = "(unknown)";
} else
statfs_path = "(unknown)";
statfs_t = ktime_get();
error = statfs_by_dentry(path->dentry, buf);
if (!error)
buf->f_flags = calculate_f_flags(path->mnt);
statfs_diff = ktime_sub(ktime_get(), statfs_t);
if (ktime_to_ns(statfs_diff) >= 5000000000LL)
pr_info("VFS: %s pid:%d(%s)(parent:%d/%s) takes %lld nsec to statfs %s.\n", __func__, current->pid, current->comm, current->parent->pid, current->parent->comm, ktime_to_ns(statfs_diff), statfs_path);
return error;
}
/*
* This is a copy of sys_ustat, just dealing with a structure layout.
* Given how simple this syscall is that apporach is more maintainable
* than the various conversion hacks.
*/
asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
{
struct super_block *sb;
struct compat_ustat tmp;
struct kstatfs sbuf;
int err;
sb = user_get_super(new_decode_dev(dev));
if (!sb)
return -EINVAL;
err = statfs_by_dentry(sb->s_root, &sbuf);
drop_super(sb);
if (err)
return err;
memset(&tmp, 0, sizeof(struct compat_ustat));
tmp.f_tfree = sbuf.f_bfree;
tmp.f_tinode = sbuf.f_ffree;
if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
return -EFAULT;
return 0;
}
int vfs_statfs(struct path *path, struct kstatfs *buf)
{
return statfs_by_dentry(path->dentry, buf);
}
