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1025 lines
24 KiB
1025 lines
24 KiB
/* AFS vnode management
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*
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* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include "internal.h"
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#if 0
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static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent,
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int depth, char lr)
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{
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struct afs_vnode *vnode;
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bool bad = false;
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if (!node)
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return false;
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if (node->rb_left)
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bad = dump_tree_aux(node->rb_left, node, depth + 2, '/');
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vnode = rb_entry(node, struct afs_vnode, cb_promise);
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_debug("%c %*.*s%c%p {%d}",
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rb_is_red(node) ? 'R' : 'B',
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depth, depth, "", lr,
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vnode, vnode->cb_expires_at);
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if (rb_parent(node) != parent) {
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printk("BAD: %p != %p\n", rb_parent(node), parent);
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bad = true;
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}
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if (node->rb_right)
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bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\');
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return bad;
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}
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static noinline void dump_tree(const char *name, struct afs_server *server)
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{
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_enter("%s", name);
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if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-'))
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BUG();
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}
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#endif
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/*
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* insert a vnode into the backing server's vnode tree
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*/
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static void afs_install_vnode(struct afs_vnode *vnode,
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struct afs_server *server)
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{
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struct afs_server *old_server = vnode->server;
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struct afs_vnode *xvnode;
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struct rb_node *parent, **p;
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_enter("%p,%p", vnode, server);
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if (old_server) {
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spin_lock(&old_server->fs_lock);
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rb_erase(&vnode->server_rb, &old_server->fs_vnodes);
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spin_unlock(&old_server->fs_lock);
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}
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afs_get_server(server);
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vnode->server = server;
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afs_put_server(old_server);
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/* insert into the server's vnode tree in FID order */
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spin_lock(&server->fs_lock);
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parent = NULL;
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p = &server->fs_vnodes.rb_node;
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while (*p) {
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parent = *p;
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xvnode = rb_entry(parent, struct afs_vnode, server_rb);
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if (vnode->fid.vid < xvnode->fid.vid)
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p = &(*p)->rb_left;
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else if (vnode->fid.vid > xvnode->fid.vid)
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p = &(*p)->rb_right;
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else if (vnode->fid.vnode < xvnode->fid.vnode)
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p = &(*p)->rb_left;
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else if (vnode->fid.vnode > xvnode->fid.vnode)
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p = &(*p)->rb_right;
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else if (vnode->fid.unique < xvnode->fid.unique)
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p = &(*p)->rb_left;
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else if (vnode->fid.unique > xvnode->fid.unique)
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p = &(*p)->rb_right;
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else
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BUG(); /* can't happen unless afs_iget() malfunctions */
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}
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rb_link_node(&vnode->server_rb, parent, p);
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rb_insert_color(&vnode->server_rb, &server->fs_vnodes);
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spin_unlock(&server->fs_lock);
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_leave("");
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}
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/*
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* insert a vnode into the promising server's update/expiration tree
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* - caller must hold vnode->lock
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*/
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static void afs_vnode_note_promise(struct afs_vnode *vnode,
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struct afs_server *server)
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{
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struct afs_server *old_server;
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struct afs_vnode *xvnode;
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struct rb_node *parent, **p;
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_enter("%p,%p", vnode, server);
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ASSERT(server != NULL);
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old_server = vnode->server;
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if (vnode->cb_promised) {
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if (server == old_server &&
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vnode->cb_expires == vnode->cb_expires_at) {
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_leave(" [no change]");
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return;
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}
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spin_lock(&old_server->cb_lock);
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if (vnode->cb_promised) {
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_debug("delete");
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rb_erase(&vnode->cb_promise, &old_server->cb_promises);
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vnode->cb_promised = false;
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}
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spin_unlock(&old_server->cb_lock);
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}
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if (vnode->server != server)
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afs_install_vnode(vnode, server);
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vnode->cb_expires_at = vnode->cb_expires;
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_debug("PROMISE on %p {%lu}",
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vnode, (unsigned long) vnode->cb_expires_at);
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/* abuse an RB-tree to hold the expiration order (we may have multiple
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* items with the same expiration time) */
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spin_lock(&server->cb_lock);
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parent = NULL;
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p = &server->cb_promises.rb_node;
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while (*p) {
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parent = *p;
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xvnode = rb_entry(parent, struct afs_vnode, cb_promise);
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if (vnode->cb_expires_at < xvnode->cb_expires_at)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&vnode->cb_promise, parent, p);
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rb_insert_color(&vnode->cb_promise, &server->cb_promises);
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vnode->cb_promised = true;
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spin_unlock(&server->cb_lock);
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_leave("");
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}
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/*
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* handle remote file deletion by discarding the callback promise
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*/
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static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
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{
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struct afs_server *server;
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_enter("{%p}", vnode->server);
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set_bit(AFS_VNODE_DELETED, &vnode->flags);
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server = vnode->server;
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if (server) {
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if (vnode->cb_promised) {
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spin_lock(&server->cb_lock);
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if (vnode->cb_promised) {
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rb_erase(&vnode->cb_promise,
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&server->cb_promises);
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vnode->cb_promised = false;
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}
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spin_unlock(&server->cb_lock);
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}
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spin_lock(&server->fs_lock);
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rb_erase(&vnode->server_rb, &server->fs_vnodes);
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spin_unlock(&server->fs_lock);
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vnode->server = NULL;
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afs_put_server(server);
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} else {
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ASSERT(!vnode->cb_promised);
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}
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_leave("");
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}
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/*
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* finish off updating the recorded status of a file after a successful
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* operation completion
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* - starts callback expiry timer
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* - adds to server's callback list
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*/
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void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
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struct afs_server *server)
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{
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struct afs_server *oldserver = NULL;
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_enter("%p,%p", vnode, server);
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spin_lock(&vnode->lock);
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clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
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afs_vnode_note_promise(vnode, server);
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vnode->update_cnt--;
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ASSERTCMP(vnode->update_cnt, >=, 0);
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spin_unlock(&vnode->lock);
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wake_up_all(&vnode->update_waitq);
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afs_put_server(oldserver);
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_leave("");
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}
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/*
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* finish off updating the recorded status of a file after an operation failed
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*/
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static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret)
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{
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_enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, ret);
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spin_lock(&vnode->lock);
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clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
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if (ret == -ENOENT) {
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/* the file was deleted on the server */
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_debug("got NOENT from server - marking file deleted");
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afs_vnode_deleted_remotely(vnode);
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}
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vnode->update_cnt--;
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ASSERTCMP(vnode->update_cnt, >=, 0);
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spin_unlock(&vnode->lock);
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wake_up_all(&vnode->update_waitq);
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_leave("");
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}
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/*
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* fetch file status from the volume
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* - don't issue a fetch if:
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* - the changed bit is not set and there's a valid callback
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* - there are any outstanding ops that will fetch the status
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* - TODO implement local caching
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*/
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int afs_vnode_fetch_status(struct afs_vnode *vnode,
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struct afs_vnode *auth_vnode, struct key *key)
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{
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struct afs_server *server;
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unsigned long acl_order;
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int ret;
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DECLARE_WAITQUEUE(myself, current);
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_enter("%s,{%x:%u.%u}",
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vnode->volume->vlocation->vldb.name,
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vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
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if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
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vnode->cb_promised) {
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_leave(" [unchanged]");
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return 0;
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}
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if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
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_leave(" [deleted]");
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return -ENOENT;
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}
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acl_order = 0;
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if (auth_vnode)
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acl_order = auth_vnode->acl_order;
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spin_lock(&vnode->lock);
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if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
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vnode->cb_promised) {
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spin_unlock(&vnode->lock);
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_leave(" [unchanged]");
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return 0;
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}
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ASSERTCMP(vnode->update_cnt, >=, 0);
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if (vnode->update_cnt > 0) {
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/* someone else started a fetch */
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_debug("wait on fetch %d", vnode->update_cnt);
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set_current_state(TASK_UNINTERRUPTIBLE);
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ASSERT(myself.func != NULL);
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add_wait_queue(&vnode->update_waitq, &myself);
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/* wait for the status to be updated */
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for (;;) {
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if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
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break;
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if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
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break;
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/* check to see if it got updated and invalidated all
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* before we saw it */
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if (vnode->update_cnt == 0) {
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remove_wait_queue(&vnode->update_waitq,
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&myself);
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set_current_state(TASK_RUNNING);
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goto get_anyway;
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}
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spin_unlock(&vnode->lock);
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schedule();
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set_current_state(TASK_UNINTERRUPTIBLE);
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spin_lock(&vnode->lock);
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}
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remove_wait_queue(&vnode->update_waitq, &myself);
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spin_unlock(&vnode->lock);
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set_current_state(TASK_RUNNING);
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return test_bit(AFS_VNODE_DELETED, &vnode->flags) ?
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-ENOENT : 0;
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}
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get_anyway:
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/* okay... we're going to have to initiate the op */
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vnode->update_cnt++;
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spin_unlock(&vnode->lock);
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/* merge AFS status fetches and clear outstanding callback on this
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* vnode */
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do {
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/* pick a server to query */
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server = afs_volume_pick_fileserver(vnode);
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if (IS_ERR(server))
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goto no_server;
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_debug("USING SERVER: %p{%08x}",
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server, ntohl(server->addr.s_addr));
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ret = afs_fs_fetch_file_status(server, key, vnode, NULL,
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false);
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} while (!afs_volume_release_fileserver(vnode, server, ret));
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/* adjust the flags */
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if (ret == 0) {
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_debug("adjust");
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if (auth_vnode)
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afs_cache_permit(vnode, key, acl_order);
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afs_vnode_finalise_status_update(vnode, server);
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afs_put_server(server);
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} else {
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_debug("failed [%d]", ret);
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afs_vnode_status_update_failed(vnode, ret);
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}
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ASSERTCMP(vnode->update_cnt, >=, 0);
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_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
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return ret;
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no_server:
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spin_lock(&vnode->lock);
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vnode->update_cnt--;
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ASSERTCMP(vnode->update_cnt, >=, 0);
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spin_unlock(&vnode->lock);
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_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
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return PTR_ERR(server);
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}
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/*
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* fetch file data from the volume
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* - TODO implement caching
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*/
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int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
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struct afs_read *desc)
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{
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struct afs_server *server;
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int ret;
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_enter("%s{%x:%u.%u},%x,,,",
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vnode->volume->vlocation->vldb.name,
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vnode->fid.vid,
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vnode->fid.vnode,
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vnode->fid.unique,
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key_serial(key));
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/* this op will fetch the status */
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spin_lock(&vnode->lock);
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vnode->update_cnt++;
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spin_unlock(&vnode->lock);
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/* merge in AFS status fetches and clear outstanding callback on this
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* vnode */
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do {
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/* pick a server to query */
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server = afs_volume_pick_fileserver(vnode);
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if (IS_ERR(server))
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goto no_server;
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_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
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ret = afs_fs_fetch_data(server, key, vnode, desc,
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false);
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} while (!afs_volume_release_fileserver(vnode, server, ret));
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|
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/* adjust the flags */
|
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if (ret == 0) {
|
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afs_vnode_finalise_status_update(vnode, server);
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afs_put_server(server);
|
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} else {
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afs_vnode_status_update_failed(vnode, ret);
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}
|
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|
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_leave(" = %d", ret);
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return ret;
|
|
|
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no_server:
|
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spin_lock(&vnode->lock);
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vnode->update_cnt--;
|
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ASSERTCMP(vnode->update_cnt, >=, 0);
|
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spin_unlock(&vnode->lock);
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return PTR_ERR(server);
|
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}
|
|
|
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/*
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* make a file or a directory
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*/
|
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int afs_vnode_create(struct afs_vnode *vnode, struct key *key,
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const char *name, umode_t mode, struct afs_fid *newfid,
|
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struct afs_file_status *newstatus,
|
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struct afs_callback *newcb, struct afs_server **_server)
|
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{
|
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struct afs_server *server;
|
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int ret;
|
|
|
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_enter("%s{%x:%u.%u},%x,%s,,",
|
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vnode->volume->vlocation->vldb.name,
|
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vnode->fid.vid,
|
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vnode->fid.vnode,
|
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vnode->fid.unique,
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key_serial(key),
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name);
|
|
|
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/* this op will fetch the status on the directory we're creating in */
|
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spin_lock(&vnode->lock);
|
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vnode->update_cnt++;
|
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spin_unlock(&vnode->lock);
|
|
|
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do {
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/* pick a server to query */
|
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server = afs_volume_pick_fileserver(vnode);
|
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if (IS_ERR(server))
|
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goto no_server;
|
|
|
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_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
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ret = afs_fs_create(server, key, vnode, name, mode, newfid,
|
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newstatus, newcb, false);
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|
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} while (!afs_volume_release_fileserver(vnode, server, ret));
|
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|
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/* adjust the flags */
|
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if (ret == 0) {
|
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afs_vnode_finalise_status_update(vnode, server);
|
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*_server = server;
|
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} else {
|
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afs_vnode_status_update_failed(vnode, ret);
|
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*_server = NULL;
|
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}
|
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|
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_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
|
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return ret;
|
|
|
|
no_server:
|
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spin_lock(&vnode->lock);
|
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vnode->update_cnt--;
|
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ASSERTCMP(vnode->update_cnt, >=, 0);
|
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spin_unlock(&vnode->lock);
|
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_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
|
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return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* remove a file or directory
|
|
*/
|
|
int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name,
|
|
bool isdir)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x,%s",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key),
|
|
name);
|
|
|
|
/* this op will fetch the status on the directory we're removing from */
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_remove(server, key, vnode, name, isdir,
|
|
false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0) {
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_put_server(server);
|
|
} else {
|
|
afs_vnode_status_update_failed(vnode, ret);
|
|
}
|
|
|
|
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
|
|
return ret;
|
|
|
|
no_server:
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt--;
|
|
ASSERTCMP(vnode->update_cnt, >=, 0);
|
|
spin_unlock(&vnode->lock);
|
|
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* create a hard link
|
|
*/
|
|
int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode,
|
|
struct key *key, const char *name)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s",
|
|
dvnode->volume->vlocation->vldb.name,
|
|
dvnode->fid.vid,
|
|
dvnode->fid.vnode,
|
|
dvnode->fid.unique,
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key),
|
|
name);
|
|
|
|
/* this op will fetch the status on the directory we're removing from */
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
spin_lock(&dvnode->lock);
|
|
dvnode->update_cnt++;
|
|
spin_unlock(&dvnode->lock);
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(dvnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_link(server, key, dvnode, vnode, name,
|
|
false);
|
|
|
|
} while (!afs_volume_release_fileserver(dvnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0) {
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_vnode_finalise_status_update(dvnode, server);
|
|
afs_put_server(server);
|
|
} else {
|
|
afs_vnode_status_update_failed(vnode, ret);
|
|
afs_vnode_status_update_failed(dvnode, ret);
|
|
}
|
|
|
|
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
|
|
return ret;
|
|
|
|
no_server:
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt--;
|
|
ASSERTCMP(vnode->update_cnt, >=, 0);
|
|
spin_unlock(&vnode->lock);
|
|
spin_lock(&dvnode->lock);
|
|
dvnode->update_cnt--;
|
|
ASSERTCMP(dvnode->update_cnt, >=, 0);
|
|
spin_unlock(&dvnode->lock);
|
|
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* create a symbolic link
|
|
*/
|
|
int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key,
|
|
const char *name, const char *content,
|
|
struct afs_fid *newfid,
|
|
struct afs_file_status *newstatus,
|
|
struct afs_server **_server)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x,%s,%s,,,",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key),
|
|
name, content);
|
|
|
|
/* this op will fetch the status on the directory we're creating in */
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_symlink(server, key, vnode, name, content,
|
|
newfid, newstatus, false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0) {
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
*_server = server;
|
|
} else {
|
|
afs_vnode_status_update_failed(vnode, ret);
|
|
*_server = NULL;
|
|
}
|
|
|
|
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
|
|
return ret;
|
|
|
|
no_server:
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt--;
|
|
ASSERTCMP(vnode->update_cnt, >=, 0);
|
|
spin_unlock(&vnode->lock);
|
|
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* rename a file
|
|
*/
|
|
int afs_vnode_rename(struct afs_vnode *orig_dvnode,
|
|
struct afs_vnode *new_dvnode,
|
|
struct key *key,
|
|
const char *orig_name,
|
|
const char *new_name)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s",
|
|
orig_dvnode->volume->vlocation->vldb.name,
|
|
orig_dvnode->fid.vid,
|
|
orig_dvnode->fid.vnode,
|
|
orig_dvnode->fid.unique,
|
|
new_dvnode->volume->vlocation->vldb.name,
|
|
new_dvnode->fid.vid,
|
|
new_dvnode->fid.vnode,
|
|
new_dvnode->fid.unique,
|
|
key_serial(key),
|
|
orig_name,
|
|
new_name);
|
|
|
|
/* this op will fetch the status on both the directories we're dealing
|
|
* with */
|
|
spin_lock(&orig_dvnode->lock);
|
|
orig_dvnode->update_cnt++;
|
|
spin_unlock(&orig_dvnode->lock);
|
|
if (new_dvnode != orig_dvnode) {
|
|
spin_lock(&new_dvnode->lock);
|
|
new_dvnode->update_cnt++;
|
|
spin_unlock(&new_dvnode->lock);
|
|
}
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(orig_dvnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_rename(server, key, orig_dvnode, orig_name,
|
|
new_dvnode, new_name, false);
|
|
|
|
} while (!afs_volume_release_fileserver(orig_dvnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0) {
|
|
afs_vnode_finalise_status_update(orig_dvnode, server);
|
|
if (new_dvnode != orig_dvnode)
|
|
afs_vnode_finalise_status_update(new_dvnode, server);
|
|
afs_put_server(server);
|
|
} else {
|
|
afs_vnode_status_update_failed(orig_dvnode, ret);
|
|
if (new_dvnode != orig_dvnode)
|
|
afs_vnode_status_update_failed(new_dvnode, ret);
|
|
}
|
|
|
|
_leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt);
|
|
return ret;
|
|
|
|
no_server:
|
|
spin_lock(&orig_dvnode->lock);
|
|
orig_dvnode->update_cnt--;
|
|
ASSERTCMP(orig_dvnode->update_cnt, >=, 0);
|
|
spin_unlock(&orig_dvnode->lock);
|
|
if (new_dvnode != orig_dvnode) {
|
|
spin_lock(&new_dvnode->lock);
|
|
new_dvnode->update_cnt--;
|
|
ASSERTCMP(new_dvnode->update_cnt, >=, 0);
|
|
spin_unlock(&new_dvnode->lock);
|
|
}
|
|
_leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt);
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* write to a file
|
|
*/
|
|
int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last,
|
|
unsigned offset, unsigned to)
|
|
{
|
|
struct afs_server *server;
|
|
struct afs_vnode *vnode = wb->vnode;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(wb->key),
|
|
first, last, offset, to);
|
|
|
|
/* this op will fetch the status */
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_store_data(server, wb, first, last, offset, to,
|
|
false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0) {
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_put_server(server);
|
|
} else {
|
|
afs_vnode_status_update_failed(vnode, ret);
|
|
}
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
no_server:
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt--;
|
|
ASSERTCMP(vnode->update_cnt, >=, 0);
|
|
spin_unlock(&vnode->lock);
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* set the attributes on a file
|
|
*/
|
|
int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key,
|
|
struct iattr *attr)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key));
|
|
|
|
/* this op will fetch the status */
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_setattr(server, key, vnode, attr, false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0) {
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_put_server(server);
|
|
} else {
|
|
afs_vnode_status_update_failed(vnode, ret);
|
|
}
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
no_server:
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt--;
|
|
ASSERTCMP(vnode->update_cnt, >=, 0);
|
|
spin_unlock(&vnode->lock);
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* get the status of a volume
|
|
*/
|
|
int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key,
|
|
struct afs_volume_status *vs)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x,",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key));
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_get_volume_status(server, key, vnode, vs, false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0)
|
|
afs_put_server(server);
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
no_server:
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* get a lock on a file
|
|
*/
|
|
int afs_vnode_set_lock(struct afs_vnode *vnode, struct key *key,
|
|
afs_lock_type_t type)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x,%u",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key), type);
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_set_lock(server, key, vnode, type, false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0)
|
|
afs_put_server(server);
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
no_server:
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* extend a lock on a file
|
|
*/
|
|
int afs_vnode_extend_lock(struct afs_vnode *vnode, struct key *key)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key));
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_extend_lock(server, key, vnode, false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0)
|
|
afs_put_server(server);
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
no_server:
|
|
return PTR_ERR(server);
|
|
}
|
|
|
|
/*
|
|
* release a lock on a file
|
|
*/
|
|
int afs_vnode_release_lock(struct afs_vnode *vnode, struct key *key)
|
|
{
|
|
struct afs_server *server;
|
|
int ret;
|
|
|
|
_enter("%s{%x:%u.%u},%x",
|
|
vnode->volume->vlocation->vldb.name,
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique,
|
|
key_serial(key));
|
|
|
|
do {
|
|
/* pick a server to query */
|
|
server = afs_volume_pick_fileserver(vnode);
|
|
if (IS_ERR(server))
|
|
goto no_server;
|
|
|
|
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
|
|
|
|
ret = afs_fs_release_lock(server, key, vnode, false);
|
|
|
|
} while (!afs_volume_release_fileserver(vnode, server, ret));
|
|
|
|
/* adjust the flags */
|
|
if (ret == 0)
|
|
afs_put_server(server);
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
no_server:
|
|
return PTR_ERR(server);
|
|
}
|
|
|