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
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <api/fs/fs.h>
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#include "header.h"
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#define MIDR "/regs/identification/midr_el1"
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#define MIDR_SIZE 19
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#define MIDR_REVISION_MASK 0xf
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#define MIDR_VARIANT_SHIFT 20
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#define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT)
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char *get_cpuid_str(struct perf_pmu *pmu)
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{
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char *buf = NULL;
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char path[PATH_MAX];
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const char *sysfs = sysfs__mountpoint();
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int cpu;
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u64 midr = 0;
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struct cpu_map *cpus;
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FILE *file;
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if (!sysfs || !pmu || !pmu->cpus)
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return NULL;
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buf = malloc(MIDR_SIZE);
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if (!buf)
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return NULL;
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/* read midr from list of cpus mapped to this pmu */
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cpus = cpu_map__get(pmu->cpus);
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for (cpu = 0; cpu < cpus->nr; cpu++) {
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scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR,
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sysfs, cpus->map[cpu]);
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file = fopen(path, "r");
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if (!file) {
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pr_debug("fopen failed for file %s\n", path);
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continue;
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}
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if (!fgets(buf, MIDR_SIZE, file)) {
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fclose(file);
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continue;
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}
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fclose(file);
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/* Ignore/clear Variant[23:20] and
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* Revision[3:0] of MIDR
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*/
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midr = strtoul(buf, NULL, 16);
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midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK));
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scnprintf(buf, MIDR_SIZE, "0x%016lx", midr);
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/* got midr break loop */
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break;
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}
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if (!midr) {
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pr_err("failed to get cpuid string for PMU %s\n", pmu->name);
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free(buf);
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buf = NULL;
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}
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cpu_map__put(cpus);
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return buf;
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}
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