- struct inode *inode = dentry->d_inode;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct ptlrpc_request *request;
- int op, mode;
- char *symname;
- int rc;
- ENTRY;
-
- op = it->it_op;
- mode = it->it_mode;
-
- ll_intent_release(dentry, it);
- down(&lli->lli_open_sem);
-
- it->it_op = op;
- it->it_mode = mode;
-
- rc = ll_readlink_internal(inode, &request, &symname);
- if (rc)
- GOTO(out, rc);
-
- rc = vfs_follow_link_it(nd, symname, it);
- out:
- up(&lli->lli_open_sem);
- ptlrpc_req_finished(request);
-
- RETURN(rc);
+ struct inode *inode = dentry->d_inode;
+ struct ptlrpc_request *request = NULL;
+ int rc;
+ char *symname = NULL;
+ ENTRY;
+
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ /* Limit the recursive symlink depth to 5 instead of default
+ * 8 links when kernel has 4k stack to prevent stack overflow.
+ * For 8k stacks we need to limit it to 7 for local servers. */
+ if (THREAD_SIZE < 8192 && current->link_count >= 6) {
+ rc = -ELOOP;
+ } else if (THREAD_SIZE == 8192 && current->link_count >= 8) {
+ rc = -ELOOP;
+ } else {
+ ll_inode_size_lock(inode);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ ll_inode_size_unlock(inode);
+ }
+ if (rc) {
+ ptlrpc_req_finished(request);
+ request = NULL;
+ symname = ERR_PTR(rc);
+ }
+
+ nd_set_link(nd, symname);
+ /* symname may contain a pointer to the request message buffer,
+ * we delay request releasing until ll_put_link then.
+ */
+ RETURN(request);
+}
+#else
+# ifdef HAVE_IOP_GET_LINK
+static const char *ll_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ struct ptlrpc_request *request;
+ char *symname = NULL;
+ int rc;
+
+ ENTRY;
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ if (!dentry)
+ RETURN(ERR_PTR(-ECHILD));
+ ll_inode_size_lock(inode);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ ll_inode_size_unlock(inode);
+ if (rc < 0) {
+ ptlrpc_req_finished(request);
+ return ERR_PTR(rc);
+ }
+
+ /* symname may contain a pointer to the request message buffer,
+ * we delay request releasing then.
+ */
+ set_delayed_call(done, ll_put_link, request);
+ RETURN(symname);
+}
+# else
+static const char *ll_follow_link(struct dentry *dentry, void **cookie)
+{
+ struct inode *inode = d_inode(dentry);
+ struct ptlrpc_request *request;
+ char *symname = NULL;
+ int rc;
+ ENTRY;
+
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ ll_inode_size_lock(inode);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ ll_inode_size_unlock(inode);
+ if (rc < 0) {
+ ptlrpc_req_finished(request);
+ return ERR_PTR(rc);
+ }
+
+ /* symname may contain a pointer to the request message buffer,
+ * we delay request releasing until ll_put_link then.
+ */
+ *cookie = request;
+ RETURN(symname);