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OpenZFS restructuring - libspl
Factor Linux specific pieces out of libspl. Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Reviewed-by: Sean Eric Fagan <sef@ixsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matt Macy <mmacy@FreeBSD.org> Closes #9336
This commit is contained in:
Matthew Macy
committed by
Brian Behlendorf
Brian Behlendorf
parent
6360e2779e
commit
d31277abb1
@@ -0,0 +1,58 @@
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/*
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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, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* 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 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <string.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <limits.h>
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const char *
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getexecname(void)
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{
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static char execname[PATH_MAX + 1] = "";
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static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
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char *ptr = NULL;
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ssize_t rc;
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(void) pthread_mutex_lock(&mtx);
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if (strlen(execname) == 0) {
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rc = readlink("/proc/self/exe",
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execname, sizeof (execname) - 1);
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if (rc == -1) {
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execname[0] = '\0';
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} else {
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execname[rc] = '\0';
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ptr = execname;
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}
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} else {
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ptr = execname;
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}
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(void) pthread_mutex_unlock(&mtx);
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return (ptr);
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}
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@@ -0,0 +1,86 @@
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/*
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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", "r");
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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);
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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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@@ -0,0 +1,165 @@
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/*
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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, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* 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 2005 Sun Microsystems, Inc. All rights reserved.
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* Copyright 2006 Ricardo Correia. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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#include <stdio.h>
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#include <string.h>
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#include <mntent.h>
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#include <sys/errno.h>
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#include <sys/mnttab.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#define BUFSIZE (MNT_LINE_MAX + 2)
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__thread char buf[BUFSIZE];
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#define DIFF(xx) ( \
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(mrefp->xx != NULL) && \
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(mgetp->xx == NULL || strcmp(mrefp->xx, mgetp->xx) != 0))
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int
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getmntany(FILE *fp, struct mnttab *mgetp, struct mnttab *mrefp)
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{
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int ret;
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while (
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((ret = _sol_getmntent(fp, mgetp)) == 0) && (
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DIFF(mnt_special) || DIFF(mnt_mountp) ||
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DIFF(mnt_fstype) || DIFF(mnt_mntopts))) { }
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return (ret);
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}
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int
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_sol_getmntent(FILE *fp, struct mnttab *mgetp)
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{
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struct mntent mntbuf;
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struct mntent *ret;
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ret = getmntent_r(fp, &mntbuf, buf, BUFSIZE);
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if (ret != NULL) {
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mgetp->mnt_special = mntbuf.mnt_fsname;
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mgetp->mnt_mountp = mntbuf.mnt_dir;
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mgetp->mnt_fstype = mntbuf.mnt_type;
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mgetp->mnt_mntopts = mntbuf.mnt_opts;
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return (0);
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}
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if (feof(fp))
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return (-1);
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return (MNT_TOOLONG);
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}
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static int
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getextmntent_impl(FILE *fp, struct extmnttab *mp, int len)
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{
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int ret;
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struct stat64 st;
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ret = _sol_getmntent(fp, (struct mnttab *)mp);
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if (ret == 0) {
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if (stat64(mp->mnt_mountp, &st) != 0) {
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mp->mnt_major = 0;
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mp->mnt_minor = 0;
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return (ret);
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}
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mp->mnt_major = major(st.st_dev);
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mp->mnt_minor = minor(st.st_dev);
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}
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return (ret);
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}
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int
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getextmntent(const char *path, struct extmnttab *entry, struct stat64 *statbuf)
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{
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struct stat64 st;
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FILE *fp;
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int match;
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if (strlen(path) >= MAXPATHLEN) {
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(void) fprintf(stderr, "invalid object; pathname too long\n");
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return (-1);
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}
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/*
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* Search for the path in /proc/self/mounts. Rather than looking for the
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* specific path, which can be fooled by non-standard paths (i.e. ".."
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* or "//"), we stat() the path and search for the corresponding
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* (major,minor) device pair.
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*/
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if (stat64(path, statbuf) != 0) {
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(void) fprintf(stderr, "cannot open '%s': %s\n",
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path, strerror(errno));
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return (-1);
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}
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#ifdef HAVE_SETMNTENT
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if ((fp = setmntent(MNTTAB, "r")) == NULL) {
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#else
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if ((fp = fopen(MNTTAB, "r")) == NULL) {
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#endif
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(void) fprintf(stderr, "cannot open %s\n", MNTTAB);
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return (-1);
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}
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/*
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* Search for the given (major,minor) pair in the mount table.
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*/
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match = 0;
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while (getextmntent_impl(fp, entry, sizeof (*entry)) == 0) {
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if (makedev(entry->mnt_major, entry->mnt_minor) ==
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statbuf->st_dev) {
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match = 1;
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break;
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}
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}
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if (!match) {
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(void) fprintf(stderr, "cannot find mountpoint for '%s'\n",
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path);
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return (-1);
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}
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if (stat64(entry->mnt_mountp, &st) != 0) {
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entry->mnt_major = 0;
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entry->mnt_minor = 0;
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return (-1);
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}
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return (0);
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}
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