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
44 lines
845 B
C
44 lines
845 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <linux/bitops.h>
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#include "api/fs/fs.h"
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#include "smt.h"
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int smt_on(void)
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{
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static bool cached;
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static int cached_result;
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int cpu;
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int ncpu;
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if (cached)
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return cached_result;
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ncpu = sysconf(_SC_NPROCESSORS_CONF);
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for (cpu = 0; cpu < ncpu; cpu++) {
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unsigned long long siblings;
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char *str;
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size_t strlen;
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char fn[256];
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snprintf(fn, sizeof fn,
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"devices/system/cpu/cpu%d/topology/thread_siblings",
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cpu);
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if (sysfs__read_str(fn, &str, &strlen) < 0)
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continue;
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/* Entry is hex, but does not have 0x, so need custom parser */
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siblings = strtoull(str, NULL, 16);
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free(str);
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if (hweight64(siblings) > 1) {
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cached_result = 1;
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cached = true;
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break;
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}
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}
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if (!cached) {
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cached_result = 0;
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cached = true;
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}
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return cached_result;
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}
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