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
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdbool.h>
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#include <errno.h>
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#include <linux/perf_event.h>
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#include "../../perf.h"
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#include <linux/types.h>
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#include "../../util/debug.h"
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#include "../../util/tsc.h"
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int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc,
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struct perf_tsc_conversion *tc)
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{
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bool cap_user_time_zero;
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u32 seq;
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int i = 0;
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while (1) {
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seq = pc->lock;
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rmb();
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tc->time_mult = pc->time_mult;
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tc->time_shift = pc->time_shift;
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tc->time_zero = pc->time_zero;
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cap_user_time_zero = pc->cap_user_time_zero;
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rmb();
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if (pc->lock == seq && !(seq & 1))
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break;
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if (++i > 10000) {
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pr_debug("failed to get perf_event_mmap_page lock\n");
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return -EINVAL;
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}
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}
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if (!cap_user_time_zero)
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return -EOPNOTSUPP;
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return 0;
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}
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u64 rdtsc(void)
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{
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unsigned int low, high;
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asm volatile("rdtsc" : "=a" (low), "=d" (high));
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return low | ((u64)high) << 32;
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}
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int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
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struct perf_tool *tool,
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perf_event__handler_t process,
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struct machine *machine)
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{
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union perf_event event = {
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.time_conv = {
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.header = {
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.type = PERF_RECORD_TIME_CONV,
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.size = sizeof(struct time_conv_event),
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},
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},
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};
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struct perf_tsc_conversion tc;
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int err;
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if (!pc)
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return 0;
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err = perf_read_tsc_conversion(pc, &tc);
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if (err == -EOPNOTSUPP)
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return 0;
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if (err)
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return err;
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pr_debug2("Synthesizing TSC conversion information\n");
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event.time_conv.time_mult = tc.time_mult;
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event.time_conv.time_shift = tc.time_shift;
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event.time_conv.time_zero = tc.time_zero;
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return process(tool, &event, NULL, machine);
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}
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