16c00db4bb
Pull AFS fixes from David Howells:
"Here's a set of patches that fix a number of bugs in the in-kernel AFS
client, including:
- Fix directory locking to not use individual page locks for
directory reading/scanning but rather to use a semaphore on the
afs_vnode struct as the directory contents must be read in a single
blob and data from different reads must not be mixed as the entire
contents may be shuffled about between reads.
- Fix address list parsing to handle port specifiers correctly.
- Only give up callback records on a server if we actually talked to
that server (we might not be able to access a server).
- Fix some callback handling bugs, including refcounting,
whole-volume callbacks and when callbacks actually get broken in
response to a CB.CallBack op.
- Fix some server/address rotation bugs, including giving up if we
can't probe a server; giving up if a server says it doesn't have a
volume, but there are more servers to try.
- Fix the decoding of fetched statuses to be OpenAFS compatible.
- Fix the handling of server lookups in Cache Manager ops (such as
CB.InitCallBackState3) to use a UUID if possible and to handle no
server being found.
- Fix a bug in server lookup where not all addresses are compared.
- Fix the non-encryption of calls that prevents some servers from
being accessed (this also requires an AF_RXRPC patch that has
already gone in through the net tree).
There's also a patch that adds tracepoints to log Cache Manager ops
that don't find a matching server, either by UUID or by address"
* tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Fix the non-encryption of calls
afs: Fix CB.CallBack handling
afs: Fix whole-volume callback handling
afs: Fix afs_find_server search loop
afs: Fix the handling of an unfound server in CM operations
afs: Add a tracepoint to record callbacks from unlisted servers
afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID
afs: Fix VNOVOL handling in address rotation
afs: Fix AFSFetchStatus decoder to provide OpenAFS compatibility
afs: Fix server rotation's handling of fileserver probe failure
afs: Fix refcounting in callback registration
afs: Fix giving up callbacks on server destruction
afs: Fix address list parsing
afs: Fix directory page locking
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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* call-path.h: Manipulate a tree data structure containing function call paths
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/rbtree.h>
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#include <linux/list.h>
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#include "util.h"
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#include "call-path.h"
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static void call_path__init(struct call_path *cp, struct call_path *parent,
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struct symbol *sym, u64 ip, bool in_kernel)
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{
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cp->parent = parent;
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cp->sym = sym;
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cp->ip = sym ? 0 : ip;
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cp->db_id = 0;
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cp->in_kernel = in_kernel;
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RB_CLEAR_NODE(&cp->rb_node);
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cp->children = RB_ROOT;
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}
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struct call_path_root *call_path_root__new(void)
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{
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struct call_path_root *cpr;
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cpr = zalloc(sizeof(struct call_path_root));
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if (!cpr)
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return NULL;
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call_path__init(&cpr->call_path, NULL, NULL, 0, false);
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INIT_LIST_HEAD(&cpr->blocks);
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return cpr;
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}
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void call_path_root__free(struct call_path_root *cpr)
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{
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struct call_path_block *pos, *n;
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list_for_each_entry_safe(pos, n, &cpr->blocks, node) {
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list_del(&pos->node);
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free(pos);
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}
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free(cpr);
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}
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static struct call_path *call_path__new(struct call_path_root *cpr,
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struct call_path *parent,
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struct symbol *sym, u64 ip,
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bool in_kernel)
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{
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struct call_path_block *cpb;
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struct call_path *cp;
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size_t n;
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if (cpr->next < cpr->sz) {
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cpb = list_last_entry(&cpr->blocks, struct call_path_block,
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node);
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} else {
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cpb = zalloc(sizeof(struct call_path_block));
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if (!cpb)
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return NULL;
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list_add_tail(&cpb->node, &cpr->blocks);
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cpr->sz += CALL_PATH_BLOCK_SIZE;
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}
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n = cpr->next++ & CALL_PATH_BLOCK_MASK;
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cp = &cpb->cp[n];
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call_path__init(cp, parent, sym, ip, in_kernel);
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return cp;
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}
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struct call_path *call_path__findnew(struct call_path_root *cpr,
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struct call_path *parent,
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struct symbol *sym, u64 ip, u64 ks)
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{
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struct rb_node **p;
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struct rb_node *node_parent = NULL;
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struct call_path *cp;
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bool in_kernel = ip >= ks;
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if (sym)
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ip = 0;
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if (!parent)
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return call_path__new(cpr, parent, sym, ip, in_kernel);
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p = &parent->children.rb_node;
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while (*p != NULL) {
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node_parent = *p;
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cp = rb_entry(node_parent, struct call_path, rb_node);
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if (cp->sym == sym && cp->ip == ip)
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return cp;
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if (sym < cp->sym || (sym == cp->sym && ip < cp->ip))
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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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cp = call_path__new(cpr, parent, sym, ip, in_kernel);
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if (!cp)
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return NULL;
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rb_link_node(&cp->rb_node, node_parent, p);
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rb_insert_color(&cp->rb_node, &parent->children);
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return cp;
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}
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