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e84a2ed7a8
Linux has an unresolved hang if you resize a pipe with bytes in it. Since there's no obvious way to detect this happening, added a workaround to disable resizing the pipe buffer if you set an environment variable. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rich Ercolani <rincebrain@gmail.com> Closes #13309
69 lines
1.8 KiB
C
69 lines
1.8 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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#if __linux__
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/*
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* Sadly, Linux has an unfixed deadlock if you do SETPIPE_SZ on a pipe
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* with data in it.
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* cf. #13232, https://bugzilla.kernel.org/show_bug.cgi?id=212295
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*
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* And since the problem is in waking up the writer, there's nothing
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* we can do about it from here.
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*
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* So if people want to, they can set this, but they
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* may regret it...
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*/
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if (getenv("ZFS_SET_PIPE_MAX") == NULL)
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return;
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#endif
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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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