static const char *ecryptfs_follow_link(struct dentry *dentry, void **cookie)
{
size_t len;
char *buf = ecryptfs_readlink_lower(dentry, &len);
if (IS_ERR(buf))
return buf;
fsstack_copy_attr_atime(d_inode(dentry),
d_inode(ecryptfs_dentry_to_lower(dentry)));
buf[len] = '\0';
return *cookie = buf;
}
static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
size_t len;
char *buf = ecryptfs_readlink_lower(dentry, &len);
if (IS_ERR(buf))
goto out;
fsstack_copy_attr_atime(dentry->d_inode,
ecryptfs_dentry_to_lower(dentry)->d_inode);
buf[len] = '\0';
out:
nd_set_link(nd, buf);
return NULL;
}
static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char *buf;
size_t len = PATH_MAX;
int rc;
rc = ecryptfs_readlink_lower(dentry, &buf, &len);
if (rc)
goto out;
fsstack_copy_attr_atime(dentry->d_inode,
ecryptfs_dentry_to_lower(dentry)->d_inode);
buf[len] = '\0';
out:
nd_set_link(nd, buf);
return NULL;
}
static int
ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
{
char *kbuf;
size_t kbufsiz, copied;
int rc;
rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
if (rc)
goto out;
copied = min_t(size_t, bufsiz, kbufsiz);
rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
kfree(kbuf);
fsstack_copy_attr_atime(dentry->d_inode,
ecryptfs_dentry_to_lower(dentry)->d_inode);
out:
return rc;
}
static const char *ecryptfs_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
size_t len;
char *buf;
if (!dentry)
return ERR_PTR(-ECHILD);
buf = ecryptfs_readlink_lower(dentry, &len);
if (IS_ERR(buf))
return buf;
fsstack_copy_attr_atime(d_inode(dentry),
d_inode(ecryptfs_dentry_to_lower(dentry)));
buf[len] = '\0';
set_delayed_call(done, kfree_link, buf);
return buf;
}