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10b575d04c
As found by
git grep -E '(open|setmntent|pipe2?)\(' |
grep -vE '((zfs|zpool)_|fd|dl|lzc_re|pidfile_|g_)open\('
FreeBSD's pidfile_open() says nothing about the flags of the files it
opens, but we can't do anything about it anyway; the implementation does
open all files with O_CLOEXEC
Consider this output with zpool.d/media appended with
"pid=$$; (ls -l /proc/$pid/fd > /dev/tty)":
$ /sbin/zpool iostat -vc media
lrwx------ 0 -> /dev/pts/0
l-wx------ 1 -> 'pipe:[3278500]'
l-wx------ 2 -> /dev/null
lrwx------ 3 -> /dev/zfs
lr-x------ 4 -> /proc/31895/mounts
lrwx------ 5 -> /dev/zfs
lr-x------ 10 -> /usr/lib/zfs-linux/zpool.d/media
vs
$ ./zpool iostat -vc vendor,upath,iostat,media
lrwx------ 0 -> /dev/pts/0
l-wx------ 1 -> 'pipe:[3279887]'
l-wx------ 2 -> /dev/null
lr-x------ 10 -> /usr/lib/zfs-linux/zpool.d/media
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11866
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2017, Lawrence Livermore National Security, LLC.
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/systeminfo.h>
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static unsigned long
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get_spl_hostid(void)
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{
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FILE *f;
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unsigned long hostid;
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char *env;
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/*
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* Allow the hostid to be subverted for testing.
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*/
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env = getenv("ZFS_HOSTID");
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if (env) {
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hostid = strtoull(env, NULL, 0);
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return (hostid & HOSTID_MASK);
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}
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f = fopen("/sys/module/spl/parameters/spl_hostid", "re");
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if (!f)
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return (0);
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if (fscanf(f, "%lu", &hostid) != 1)
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hostid = 0;
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fclose(f);
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return (hostid & HOSTID_MASK);
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}
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unsigned long
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get_system_hostid(void)
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{
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unsigned long system_hostid = get_spl_hostid();
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/*
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* We do not use the library call gethostid() because
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* it generates a hostid value that the kernel is
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* unaware of, if the spl_hostid module parameter has not
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* been set and there is no system hostid file (e.g.
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* /etc/hostid). The kernel and userspace must agree.
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* See comments above hostid_read() in the SPL.
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*/
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if (system_hostid == 0) {
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int fd, rc;
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unsigned long hostid;
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int hostid_size = 4; /* 4 bytes regardless of arch */
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fd = open("/etc/hostid", O_RDONLY | O_CLOEXEC);
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if (fd >= 0) {
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rc = read(fd, &hostid, hostid_size);
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if (rc > 0)
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system_hostid = (hostid & HOSTID_MASK);
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close(fd);
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}
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}
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return (system_hostid);
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}
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