--- /dev/null
+/* AFS vnode management
+ *
+ * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include "internal.h"
+
+#if 0
+static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent,
+ int depth, char lr)
+{
+ struct afs_vnode *vnode;
+ bool bad = false;
+
+ if (!node)
+ return false;
+
+ if (node->rb_left)
+ bad = dump_tree_aux(node->rb_left, node, depth + 2, '/');
+
+ vnode = rb_entry(node, struct afs_vnode, cb_promise);
+ _debug("%c %*.*s%c%p {%d}",
+ rb_is_red(node) ? 'R' : 'B',
+ depth, depth, "", lr,
+ vnode, vnode->cb_expires_at);
+ if (rb_parent(node) != parent) {
+ printk("BAD: %p != %p\n", rb_parent(node), parent);
+ bad = true;
+ }
+
+ if (node->rb_right)
+ bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\');
+
+ return bad;
+}
+
+static noinline void dump_tree(const char *name, struct afs_server *server)
+{
+ _enter("%s", name);
+ if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-'))
+ BUG();
+}
+#endif
+
+/*
+ * 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("");
+}
+
+/*
+ * insert a vnode into the promising server's update/expiration tree
+ * - caller must hold vnode->lock
+ */
+static void afs_vnode_note_promise(struct afs_vnode *vnode,
+ struct afs_server *server)
+{
+ struct afs_server *old_server;
+ struct afs_vnode *xvnode;
+ struct rb_node *parent, **p;
+
+ _enter("%p,%p", vnode, server);
+
+ ASSERT(server != NULL);
+
+ old_server = vnode->server;
+ if (vnode->cb_promised) {
+ if (server == old_server &&
+ vnode->cb_expires == vnode->cb_expires_at) {
+ _leave(" [no change]");
+ return;
+ }
+
+ spin_lock(&old_server->cb_lock);
+ if (vnode->cb_promised) {
+ _debug("delete");
+ rb_erase(&vnode->cb_promise, &old_server->cb_promises);
+ vnode->cb_promised = false;
+ }
+ spin_unlock(&old_server->cb_lock);
+ }
+
+ if (vnode->server != server)
+ afs_install_vnode(vnode, server);
+
+ vnode->cb_expires_at = vnode->cb_expires;
+ _debug("PROMISE on %p {%lu}",
+ vnode, (unsigned long) vnode->cb_expires_at);
+
+ /* abuse an RB-tree to hold the expiration order (we may have multiple
+ * items with the same expiration time) */
+ spin_lock(&server->cb_lock);
+
+ parent = NULL;
+ p = &server->cb_promises.rb_node;
+ while (*p) {
+ parent = *p;
+ xvnode = rb_entry(parent, struct afs_vnode, cb_promise);
+ if (vnode->cb_expires_at < xvnode->cb_expires_at)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&vnode->cb_promise, parent, p);
+ rb_insert_color(&vnode->cb_promise, &server->cb_promises);
+ vnode->cb_promised = true;
+
+ spin_unlock(&server->cb_lock);
+ _leave("");
+}
+
+/*
+ * handle remote file deletion by discarding the callback promise
+ */
+static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
+{
+ struct afs_server *server;
+
+ _enter("{%p}", vnode->server);
+
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+
+ server = vnode->server;
+ if (server) {
+ if (vnode->cb_promised) {
+ spin_lock(&server->cb_lock);
+ if (vnode->cb_promised) {
+ rb_erase(&vnode->cb_promise,
+ &server->cb_promises);
+ vnode->cb_promised = false;
+ }
+ spin_unlock(&server->cb_lock);
+ }
+
+ spin_lock(&server->fs_lock);
+ rb_erase(&vnode->server_rb, &server->fs_vnodes);
+ spin_unlock(&server->fs_lock);
+
+ vnode->server = NULL;
+ afs_put_server(server);
+ } else {
+ ASSERT(!vnode->cb_promised);
+ }
+
+ _leave("");
+}
+
+/*
+ * finish off updating the recorded status of a file after a successful
+ * operation completion
+ * - starts callback expiry timer
+ * - adds to server's callback list
+ */
+void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
+ struct afs_server *server)
+{
+ struct afs_server *oldserver = NULL;
+
+ _enter("%p,%p", vnode, server);
+
+ spin_lock(&vnode->lock);
+ clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ afs_vnode_note_promise(vnode, server);
+ vnode->update_cnt--;
+ ASSERTCMP(vnode->update_cnt, >=, 0);
+ spin_unlock(&vnode->lock);
+
+ wake_up_all(&vnode->update_waitq);
+ afs_put_server(oldserver);
+ _leave("");
+}
+
+/*
+ * finish off updating the recorded status of a file after an operation failed
+ */
+static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret)
+{
+ _enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, ret);
+
+ spin_lock(&vnode->lock);
+
+ clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+
+ if (ret == -ENOENT) {
+ /* the file was deleted on the server */
+ _debug("got NOENT from server - marking file deleted");
+ afs_vnode_deleted_remotely(vnode);
+ }
+
+ vnode->update_cnt--;
+ ASSERTCMP(vnode->update_cnt, >=, 0);
+ spin_unlock(&vnode->lock);
+
+ wake_up_all(&vnode->update_waitq);
+ _leave("");
+}
+
+/*
+ * fetch file status from the volume
+ * - don't issue a fetch if:
+ * - the changed bit is not set and there's a valid callback
+ * - there are any outstanding ops that will fetch the status
+ * - TODO implement local caching
+ */
+int afs_vnode_fetch_status(struct afs_vnode *vnode,
+ struct afs_vnode *auth_vnode, struct key *key)
+{
+ struct afs_server *server;
+ unsigned long acl_order;
+ int ret;
+
+ DECLARE_WAITQUEUE(myself, current);
+
+ _enter("%s,{%x:%u.%u}",
+ vnode->volume->vlocation->vldb.name,
+ vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
+
+ if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
+ vnode->cb_promised) {
+ _leave(" [unchanged]");
+ return 0;
+ }
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _leave(" [deleted]");
+ return -ENOENT;
+ }
+
+ acl_order = 0;
+ if (auth_vnode)
+ acl_order = auth_vnode->acl_order;
+
+ spin_lock(&vnode->lock);
+
+ if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
+ vnode->cb_promised) {
+ spin_unlock(&vnode->lock);
+ _leave(" [unchanged]");
+ return 0;
+ }
+
+ ASSERTCMP(vnode->update_cnt, >=, 0);
+
+ if (vnode->update_cnt > 0) {
+ /* someone else started a fetch */
+ _debug("wait on fetch %d", vnode->update_cnt);
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ ASSERT(myself.func != NULL);
+ add_wait_queue(&vnode->update_waitq, &myself);
+
+ /* wait for the status to be updated */
+ for (;;) {
+ if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
+ break;
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ break;
+
+ /* check to see if it got updated and invalidated all
+ * before we saw it */
+ if (vnode->update_cnt == 0) {
+ remove_wait_queue(&vnode->update_waitq,
+ &myself);
+ set_current_state(TASK_RUNNING);
+ goto get_anyway;
+ }
+
+ spin_unlock(&vnode->lock);
+
+ schedule();
+ set_current_state(TASK_UNINTERRUPTIBLE);
+
+ spin_lock(&vnode->lock);
+ }
+
+ remove_wait_queue(&vnode->update_waitq, &myself);
+ spin_unlock(&vnode->lock);
+ set_current_state(TASK_RUNNING);
+
+ return test_bit(AFS_VNODE_DELETED, &vnode->flags) ?
+ -ENOENT : 0;
+ }
+
+get_anyway:
+ /* okay... we're going to have to initiate the op */
+ vnode->update_cnt++;
+
+ spin_unlock(&vnode->lock);
+
+ /* merge AFS status fetches and clear outstanding callback on this
+ * vnode */
+ do {
+ /* pick a server to query */
+ server = afs_volume_pick_fileserver(vnode);
+ if (IS_ERR(server))
+ goto no_server;
+
+ _debug("USING SERVER: %p{%08x}",
+ server, ntohl(server->addr.s_addr));
+
+ ret = afs_fs_fetch_file_status(server, key, vnode, NULL,
+ &afs_sync_call);
+
+ } while (!afs_volume_release_fileserver(vnode, server, ret));
+
+ /* adjust the flags */
+ if (ret == 0) {
+ _debug("adjust");
+ if (auth_vnode)
+ afs_cache_permit(vnode, key, acl_order);
+ afs_vnode_finalise_status_update(vnode, server);
+ afs_put_server(server);
+ } else {
+ _debug("failed [%d]", ret);
+ afs_vnode_status_update_failed(vnode, ret);
+ }
+
+ ASSERTCMP(vnode->update_cnt, >=, 0);
+
+ _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);
+}
+
+/*
+ * fetch file data from the volume
+ * - TODO implement caching
+ */
+int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
+ off_t offset, size_t length, struct page *page)
+{
+ 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);
+
+ /* merge in AFS status fetches and clear outstanding callback on this
+ * vnode */
+ 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_fetch_data(server, key, vnode, offset, length,
+ page, &afs_sync_call);
+
+ } 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);
+}
+
+/*
+ * make a file or a directory
+ */
+int afs_vnode_create(struct afs_vnode *vnode, struct key *key,
+ const char *name, umode_t mode, struct afs_fid *newfid,
+ struct afs_file_status *newstatus,
+ struct afs_callback *newcb, struct afs_server **_server)
+{
+ 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 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_create(server, key, vnode, name, mode, newfid,
+ newstatus, newcb, &afs_sync_call);
+
+ } 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);
+}
+
+/*
+ * 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,
+ &afs_sync_call);
+
+ } 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,
+ &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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,
+ &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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, &afs_sync_call);
+
+ } 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);
+}
Code Review / kvmfornfv.git / blobdiff