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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
53 lines
1.4 KiB
C
53 lines
1.4 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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#include <libzfs.h>
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#include "libzfs_impl.h"
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#ifndef F_SETPIPE_SZ
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#define F_SETPIPE_SZ (F_SETLEASE + 7)
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#endif /* F_SETPIPE_SZ */
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#ifndef F_GETPIPE_SZ
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#define F_GETPIPE_SZ (F_GETLEASE + 7)
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#endif /* F_GETPIPE_SZ */
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void
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libzfs_set_pipe_max(int infd)
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{
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FILE *procf = fopen("/proc/sys/fs/pipe-max-size", "re");
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if (procf != NULL) {
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unsigned long max_psize;
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long cur_psize;
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if (fscanf(procf, "%lu", &max_psize) > 0) {
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cur_psize = fcntl(infd, F_GETPIPE_SZ);
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if (cur_psize > 0 &&
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max_psize > (unsigned long) cur_psize)
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fcntl(infd, F_SETPIPE_SZ,
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max_psize);
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}
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fclose(procf);
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}
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}
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