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
90 lines
2 KiB
C
90 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* perf_hooks.c
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*
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* Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2016 Huawei Inc.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include "util/util.h"
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#include "util/debug.h"
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#include "util/perf-hooks.h"
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static sigjmp_buf jmpbuf;
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static const struct perf_hook_desc *current_perf_hook;
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void perf_hooks__invoke(const struct perf_hook_desc *desc)
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{
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if (!(desc && desc->p_hook_func && *desc->p_hook_func))
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return;
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if (sigsetjmp(jmpbuf, 1)) {
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pr_warning("Fatal error (SEGFAULT) in perf hook '%s'\n",
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desc->hook_name);
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*(current_perf_hook->p_hook_func) = NULL;
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} else {
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current_perf_hook = desc;
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(**desc->p_hook_func)(desc->hook_ctx);
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}
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current_perf_hook = NULL;
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}
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void perf_hooks__recover(void)
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{
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if (current_perf_hook)
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siglongjmp(jmpbuf, 1);
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}
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#define PERF_HOOK(name) \
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perf_hook_func_t __perf_hook_func_##name = NULL; \
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struct perf_hook_desc __perf_hook_desc_##name = \
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{.hook_name = #name, \
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.p_hook_func = &__perf_hook_func_##name, \
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.hook_ctx = NULL};
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#include "perf-hooks-list.h"
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#undef PERF_HOOK
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#define PERF_HOOK(name) \
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&__perf_hook_desc_##name,
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static struct perf_hook_desc *perf_hooks[] = {
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#include "perf-hooks-list.h"
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};
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#undef PERF_HOOK
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int perf_hooks__set_hook(const char *hook_name,
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perf_hook_func_t hook_func,
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void *hook_ctx)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
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if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
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continue;
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if (*(perf_hooks[i]->p_hook_func))
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pr_warning("Overwrite existing hook: %s\n", hook_name);
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*(perf_hooks[i]->p_hook_func) = hook_func;
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perf_hooks[i]->hook_ctx = hook_ctx;
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return 0;
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}
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return -ENOENT;
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}
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perf_hook_func_t perf_hooks__get_hook(const char *hook_name)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
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if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
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continue;
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return *(perf_hooks[i]->p_hook_func);
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}
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return ERR_PTR(-ENOENT);
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}
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