/*
* finish off updating the recorded status of a file
* - starts callback expiry timer
* - adds to server's callback list
*/
void afs_vnode_finalise_status_update(afs_vnode_t *vnode, afs_server_t *server, int ret)
{
afs_server_t *oldserver = NULL;
_enter("%p,%p,%d",vnode,server,ret);
spin_lock(&vnode->lock);
vnode->flags &= ~AFS_VNODE_CHANGED;
if (ret==0) {
/* adjust the callback timeout appropriately */
afs_kafstimod_add_timer(&vnode->cb_timeout,vnode->cb_expiry*HZ);
spin_lock(&afs_cb_hash_lock);
list_del(&vnode->cb_hash_link);
list_add_tail(&vnode->cb_hash_link,&afs_cb_hash(server,&vnode->fid));
spin_unlock(&afs_cb_hash_lock);
/* swap ref to old callback server with that for new callback server */
oldserver = xchg(&vnode->cb_server,server);
if (oldserver!=server) {
if (oldserver) {
spin_lock(&oldserver->cb_lock);
list_del_init(&vnode->cb_link);
spin_unlock(&oldserver->cb_lock);
}
afs_get_server(server);
spin_lock(&server->cb_lock);
list_add_tail(&vnode->cb_link,&server->cb_promises);
spin_unlock(&server->cb_lock);
}
else {
/* same server */
oldserver = NULL;
}
}
else if (ret==-ENOENT) {
/* the file was deleted - clear the callback timeout */
oldserver = xchg(&vnode->cb_server,NULL);
afs_kafstimod_del_timer(&vnode->cb_timeout);
_debug("got NOENT from server - marking file deleted");
vnode->flags |= AFS_VNODE_DELETED;
}
vnode->update_cnt--;
spin_unlock(&vnode->lock);
wake_up_all(&vnode->update_waitq);
afs_put_server(oldserver);
_leave("");
} /* end afs_vnode_finalise_status_update() */
/*
* insert a vnode into the backing server's vnode tree
*/
static void afs_install_vnode(struct afs_vnode *vnode,
struct afs_server *server)
{
struct afs_server *old_server = vnode->server;
struct afs_vnode *xvnode;
struct rb_node *parent, **p;
_enter("%p,%p", vnode, server);
if (old_server) {
spin_lock(&old_server->fs_lock);
rb_erase(&vnode->server_rb, &old_server->fs_vnodes);
spin_unlock(&old_server->fs_lock);
}
afs_get_server(server);
vnode->server = server;
afs_put_server(old_server);
/* insert into the server's vnode tree in FID order */
spin_lock(&server->fs_lock);
parent = NULL;
p = &server->fs_vnodes.rb_node;
while (*p) {
parent = *p;
xvnode = rb_entry(parent, struct afs_vnode, server_rb);
if (vnode->fid.vid < xvnode->fid.vid)
p = &(*p)->rb_left;
else if (vnode->fid.vid > xvnode->fid.vid)
p = &(*p)->rb_right;
else if (vnode->fid.vnode < xvnode->fid.vnode)
p = &(*p)->rb_left;
else if (vnode->fid.vnode > xvnode->fid.vnode)
p = &(*p)->rb_right;
else if (vnode->fid.unique < xvnode->fid.unique)
p = &(*p)->rb_left;
else if (vnode->fid.unique > xvnode->fid.unique)
p = &(*p)->rb_right;
else
BUG(); /* can't happen unless afs_iget() malfunctions */
}
rb_link_node(&vnode->server_rb, parent, p);
rb_insert_color(&vnode->server_rb, &server->fs_vnodes);
spin_unlock(&server->fs_lock);
_leave("");
}
/*
* pick a server to use to try accessing this volume
* - returns with an elevated usage count on the server chosen
*/
struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *vnode)
{
struct afs_volume *volume = vnode->volume;
struct afs_server *server;
int ret, state, loop;
_enter("%s", volume->vlocation->vldb.name);
/* stick with the server we're already using if we can */
if (vnode->server && vnode->server->fs_state == 0) {
afs_get_server(vnode->server);
_leave(" = %p [current]", vnode->server);
return vnode->server;
}
down_read(&volume->server_sem);
/* handle the no-server case */
if (volume->nservers == 0) {
ret = volume->rjservers ? -ENOMEDIUM : -ESTALE;
up_read(&volume->server_sem);
_leave(" = %d [no servers]", ret);
return ERR_PTR(ret);
}
/* basically, just search the list for the first live server and use
* that */
ret = 0;
for (loop = 0; loop < volume->nservers; loop++) {
server = volume->servers[loop];
state = server->fs_state;
_debug("consider %d [%d]", loop, state);
switch (state) {
/* found an apparently healthy server */
case 0:
afs_get_server(server);
up_read(&volume->server_sem);
_leave(" = %p (picked %08x)",
server, ntohl(server->addr.s_addr));
return server;
case -ENETUNREACH:
if (ret == 0)
ret = state;
break;
case -EHOSTUNREACH:
if (ret == 0 ||
ret == -ENETUNREACH)
ret = state;
break;
case -ECONNREFUSED:
if (ret == 0 ||
ret == -ENETUNREACH ||
ret == -EHOSTUNREACH)
ret = state;
break;
default:
case -EREMOTEIO:
if (ret == 0 ||
ret == -ENETUNREACH ||
ret == -EHOSTUNREACH ||
ret == -ECONNREFUSED)
ret = state;
break;
}
}
/* no available servers
* - TODO: handle the no active servers case better
*/
up_read(&volume->server_sem);
_leave(" = %d", ret);
return ERR_PTR(ret);
}