nfsdcltrack: remove the nfsdcld daemon

Since we want to move to using the usermodehelper upcall
unconditionally, just remove nfsdcld. The kernel code to handle
this will be formally deprecated in 3.10 as well.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

4 files changed, 2 insertions, 797 deletions

diff --git a/utils/nfsdcltrack/Makefile.am b/utils/nfsdcltrack/Makefile.am
index 1746a25..a860ffb 100644
--- a/utils/nfsdcltrack/Makefile.am
+++ b/utils/nfsdcltrack/Makefile.am
@@ -1,13 +1,10 @@
 ## Process this file with automake to produce Makefile.in
 
-man8_MANS	= nfsdcld.man nfsdcltrack.man
+man8_MANS	= nfsdcltrack.man
 EXTRA_DIST	= $(man8_MANS)
 
 AM_CFLAGS	+= -D_LARGEFILE64_SOURCE
-sbin_PROGRAMS	= nfsdcld nfsdcltrack
-
-nfsdcld_SOURCES = nfsdcld.c sqlite.c
-nfsdcld_LDADD = ../../support/nfs/libnfs.a $(LIBEVENT) $(LIBSQLITE) $(LIBCAP)
+sbin_PROGRAMS	= nfsdcltrack
 
 nfsdcltrack_SOURCES = nfsdcltrack.c sqlite.c
 nfsdcltrack_LDADD = ../../support/nfs/libnfs.a $(LIBSQLITE) $(LIBCAP)
diff --git a/utils/nfsdcltrack/nfsdcld b/utils/nfsdcltrack/nfsdcld
deleted file mode 100755
index eedf29d..0000000
--- a/utils/nfsdcltrack/nfsdcld
+++ /dev/null
diff --git a/utils/nfsdcltrack/nfsdcld.c b/utils/nfsdcltrack/nfsdcld.c
deleted file mode 100644
index 473d069..0000000
--- a/utils/nfsdcltrack/nfsdcld.c
+++ /dev/null
@@ -1,607 +0,0 @@
-/*
- * nfsdcld.c -- NFSv4 client name tracking daemon
- *
- * Copyright (C) 2011  Red Hat, Jeff Layton <jlayton@redhat.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif /* HAVE_CONFIG_H */
-
-#include <errno.h>
-#include <event.h>
-#include <stdbool.h>
-#include <getopt.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <libgen.h>
-#include <sys/inotify.h>
-#ifdef HAVE_SYS_CAPABILITY_H
-#include <sys/prctl.h>
-#include <sys/capability.h>
-#endif
-
-#include "xlog.h"
-#include "nfslib.h"
-#include "cld.h"
-#include "sqlite.h"
-
-#ifndef PIPEFS_DIR
-#define PIPEFS_DIR NFS_STATEDIR "/rpc_pipefs"
-#endif
-
-#define DEFAULT_CLD_PATH	PIPEFS_DIR "/nfsd/cld"
-
-#ifndef CLD_DEFAULT_STORAGEDIR
-#define CLD_DEFAULT_STORAGEDIR NFS_STATEDIR "/nfsdcld"
-#endif
-
-#define UPCALL_VERSION		1
-
-/* private data structures */
-struct cld_client {
-	int			cl_fd;
-	struct event		cl_event;
-	struct cld_msg	cl_msg;
-};
-
-/* global variables */
-static char *pipepath = DEFAULT_CLD_PATH;
-static int 		inotify_fd = -1;
-static struct event	pipedir_event;
-
-static struct option longopts[] =
-{
-	{ "help", 0, NULL, 'h' },
-	{ "foreground", 0, NULL, 'F' },
-	{ "debug", 0, NULL, 'd' },
-	{ "pipe", 1, NULL, 'p' },
-	{ "storagedir", 1, NULL, 's' },
-	{ NULL, 0, 0, 0 },
-};
-
-/* forward declarations */
-static void cldcb(int UNUSED(fd), short which, void *data);
-
-static void
-usage(char *progname)
-{
-	printf("%s [ -hFd ] [ -p pipe ] [ -s dir ]\n", progname);
-}
-
-static int
-cld_set_caps(void)
-{
-	int ret = 0;
-#ifdef HAVE_SYS_CAPABILITY_H
-	unsigned long i;
-	cap_t caps;
-
-	if (getuid() != 0) {
-		xlog(L_ERROR, "Not running as root. Daemon won't be able to "
-			      "open the pipe after dropping capabilities!");
-		return -EINVAL;
-	}
-
-	/* prune the bounding set to nothing */
-	for (i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0 ; ++i) {
-		ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0);
-		if (ret) {
-			xlog(L_ERROR, "Unable to prune capability %lu from "
-				      "bounding set: %m", i);
-			return -errno;
-		}
-	}
-
-	/* get a blank capset */
-	caps = cap_init();
-	if (caps == NULL) {
-		xlog(L_ERROR, "Unable to get blank capability set: %m");
-		return -errno;
-	}
-
-	/* reset the process capabilities */
-	if (cap_set_proc(caps) != 0) {
-		xlog(L_ERROR, "Unable to set process capabilities: %m");
-		ret = -errno;
-	}
-	cap_free(caps);
-#endif
-	return ret;
-}
-
-#define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX)
-
-static int
-cld_pipe_open(struct cld_client *clnt)
-{
-	int fd;
-
-	xlog(D_GENERAL, "%s: opening upcall pipe %s", __func__, pipepath);
-	fd = open(pipepath, O_RDWR, 0);
-	if (fd < 0) {
-		xlog(D_GENERAL, "%s: open of %s failed: %m", __func__, pipepath);
-		return -errno;
-	}
-
-	if (clnt->cl_event.ev_flags & EVLIST_INIT)
-		event_del(&clnt->cl_event);
-	if (clnt->cl_fd >= 0)
-		close(clnt->cl_fd);
-
-	clnt->cl_fd = fd;
-	event_set(&clnt->cl_event, clnt->cl_fd, EV_READ, cldcb, clnt);
-	/* event_add is done by the caller */
-	return 0;
-}
-
-static void
-cld_inotify_cb(int UNUSED(fd), short which, void *data)
-{
-	int ret;
-	size_t elen;
-	ssize_t rret;
-	char evbuf[INOTIFY_EVENT_MAX];
-	char *dirc = NULL, *pname;
-	struct inotify_event *event = (struct inotify_event *)evbuf;
-	struct cld_client *clnt = data;
-
-	if (which != EV_READ)
-		return;
-
-	xlog(D_GENERAL, "%s: called for EV_READ", __func__);
-
-	dirc = strndup(pipepath, PATH_MAX);
-	if (!dirc) {
-		xlog(L_ERROR, "%s: unable to allocate memory", __func__);
-		goto out;
-	}
-
-	rret = read(inotify_fd, evbuf, INOTIFY_EVENT_MAX);
-	if (rret < 0) {
-		xlog(L_ERROR, "%s: read from inotify fd failed: %m", __func__);
-		goto out;
-	}
-
-	/* check to see if we have a filename in the evbuf */
-	if (!event->len) {
-		xlog(D_GENERAL, "%s: no filename in inotify event", __func__);
-		goto out;
-	}
-
-	pname = basename(dirc);
-	elen = strnlen(event->name, event->len);
-
-	/* does the filename match our pipe? */
-	if (strlen(pname) != elen || memcmp(pname, event->name, elen)) {
-		xlog(D_GENERAL, "%s: wrong filename (%s)", __func__,
-				event->name);
-		goto out;
-	}
-
-	ret = cld_pipe_open(clnt);
-	switch (ret) {
-	case 0:
-		/* readd the event for the cl_event pipe */
-		event_add(&clnt->cl_event, NULL);
-		break;
-	case -ENOENT:
-		/* pipe must have disappeared, wait for it to come back */
-		goto out;
-	default:
-		/* anything else is fatal */
-		xlog(L_FATAL, "%s: unable to open new pipe (%d). Aborting.",
-			ret, __func__);
-		exit(ret);
-	}
-
-out:
-	event_add(&pipedir_event, NULL);
-	free(dirc);
-}
-
-static int
-cld_inotify_setup(void)
-{
-	int ret;
-	char *dirc, *dname;
-
-	dirc = strndup(pipepath, PATH_MAX);
-	if (!dirc) {
-		xlog_err("%s: unable to allocate memory", __func__);
-		ret = -ENOMEM;
-		goto out_free;
-	}
-
-	dname = dirname(dirc);
-
-	inotify_fd = inotify_init();
-	if (inotify_fd < 0) {
-		xlog_err("%s: inotify_init failed: %m", __func__);
-		ret = -errno;
-		goto out_free;
-	}
-
-	ret = inotify_add_watch(inotify_fd, dname, IN_CREATE);
-	if (ret < 0) {
-		xlog_err("%s: inotify_add_watch failed: %m", __func__);
-		ret = -errno;
-		goto out_err;
-	}
-
-out_free:
-	free(dirc);
-	return 0;
-out_err:
-	close(inotify_fd);
-	goto out_free;
-}
-
-/*
- * Set an inotify watch on the directory that should contain the pipe, and then
- * try to open it. If it fails with anything but -ENOENT, return the error
- * immediately.
- *
- * If it succeeds, then set up the pipe event handler. At that point, set up
- * the inotify event handler and go ahead and return success.
- */
-static int
-cld_pipe_init(struct cld_client *clnt)
-{
-	int ret;
-
-	xlog(D_GENERAL, "%s: init pipe handlers", __func__);
-
-	ret = cld_inotify_setup();
-	if (ret != 0)
-		goto out;
-
-	clnt->cl_fd = -1;
-	ret = cld_pipe_open(clnt);
-	switch (ret) {
-	case 0:
-		/* add the event and we're good to go */
-		event_add(&clnt->cl_event, NULL);
-		break;
-	case -ENOENT:
-		/* ignore this error -- cld_inotify_cb will handle it */
-		ret = 0;
-		break;
-	default:
-		/* anything else is fatal */
-		close(inotify_fd);
-		goto out;
-	}
-
-	/* set event for inotify read */
-	event_set(&pipedir_event, inotify_fd, EV_READ, cld_inotify_cb, clnt);
-	event_add(&pipedir_event, NULL);
-out:
-	return ret;
-}
-
-static void
-cld_not_implemented(struct cld_client *clnt)
-{
-	int ret;
-	ssize_t bsize, wsize;
-	struct cld_msg *cmsg = &clnt->cl_msg;
-
-	xlog(D_GENERAL, "%s: downcalling with not implemented error", __func__);
-
-	/* set up reply */
-	cmsg->cm_status = -EOPNOTSUPP;
-
-	bsize = sizeof(*cmsg);
-
-	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
-	if (wsize != bsize)
-		xlog(L_ERROR, "%s: problem writing to cld pipe (%ld): %m",
-			 __func__, wsize);
-
-	/* reopen pipe, just to be sure */
-	ret = cld_pipe_open(clnt);
-	if (ret) {
-		xlog(L_FATAL, "%s: unable to reopen pipe: %d", __func__, ret);
-		exit(ret);
-	}
-}
-
-static void
-cld_create(struct cld_client *clnt)
-{
-	int ret;
-	ssize_t bsize, wsize;
-	struct cld_msg *cmsg = &clnt->cl_msg;
-
-	xlog(D_GENERAL, "%s: create client record.", __func__);
-
-	ret = sqlite_insert_client(cmsg->cm_u.cm_name.cn_id,
-				   cmsg->cm_u.cm_name.cn_len);
-
-	cmsg->cm_status = ret ? -EREMOTEIO : ret;
-
-	bsize = sizeof(*cmsg);
-
-	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
-	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
-	if (wsize != bsize) {
-		xlog(L_ERROR, "%s: problem writing to cld pipe (%ld): %m",
-			 __func__, wsize);
-		ret = cld_pipe_open(clnt);
-		if (ret) {
-			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
-					__func__, ret);
-			exit(ret);
-		}
-	}
-}
-
-static void
-cld_remove(struct cld_client *clnt)
-{
-	int ret;
-	ssize_t bsize, wsize;
-	struct cld_msg *cmsg = &clnt->cl_msg;
-
-	xlog(D_GENERAL, "%s: remove client record.", __func__);
-
-	ret = sqlite_remove_client(cmsg->cm_u.cm_name.cn_id,
-				   cmsg->cm_u.cm_name.cn_len);
-
-	cmsg->cm_status = ret ? -EREMOTEIO : ret;
-
-	bsize = sizeof(*cmsg);
-
-	xlog(D_GENERAL, "%s: downcall with status %d", __func__,
-			cmsg->cm_status);
-	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
-	if (wsize != bsize) {
-		xlog(L_ERROR, "%s: problem writing to cld pipe (%ld): %m",
-			 __func__, wsize);
-		ret = cld_pipe_open(clnt);
-		if (ret) {
-			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
-					__func__, ret);
-			exit(ret);
-		}
-	}
-}
-
-static void
-cld_check(struct cld_client *clnt)
-{
-	int ret;
-	ssize_t bsize, wsize;
-	struct cld_msg *cmsg = &clnt->cl_msg;
-
-	xlog(D_GENERAL, "%s: check client record", __func__);
-
-	ret = sqlite_check_client(cmsg->cm_u.cm_name.cn_id,
-				  cmsg->cm_u.cm_name.cn_len);
-
-	/* set up reply */
-	cmsg->cm_status = ret ? -EACCES : ret;
-
-	bsize = sizeof(*cmsg);
-
-	xlog(D_GENERAL, "%s: downcall with status %d", __func__,
-			cmsg->cm_status);
-	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
-	if (wsize != bsize) {
-		xlog(L_ERROR, "%s: problem writing to cld pipe (%ld): %m",
-			 __func__, wsize);
-		ret = cld_pipe_open(clnt);
-		if (ret) {
-			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
-					__func__, ret);
-			exit(ret);
-		}
-	}
-}
-
-static void
-cld_gracedone(struct cld_client *clnt)
-{
-	int ret;
-	ssize_t bsize, wsize;
-	struct cld_msg *cmsg = &clnt->cl_msg;
-
-	xlog(D_GENERAL, "%s: grace done. cm_gracetime=%ld", __func__,
-			cmsg->cm_u.cm_gracetime);
-
-	ret = sqlite_remove_unreclaimed(cmsg->cm_u.cm_gracetime);
-
-	/* set up reply: downcall with 0 status */
-	cmsg->cm_status = ret ? -EREMOTEIO : ret;
-
-	bsize = sizeof(*cmsg);
-
-	xlog(D_GENERAL, "Doing downcall with status %d", cmsg->cm_status);
-	wsize = atomicio((void *)write, clnt->cl_fd, cmsg, bsize);
-	if (wsize != bsize) {
-		xlog(L_ERROR, "%s: problem writing to cld pipe (%ld): %m",
-			 __func__, wsize);
-		ret = cld_pipe_open(clnt);
-		if (ret) {
-			xlog(L_FATAL, "%s: unable to reopen pipe: %d",
-					__func__, ret);
-			exit(ret);
-		}
-	}
-}
-
-static void
-cldcb(int UNUSED(fd), short which, void *data)
-{
-	ssize_t len;
-	struct cld_client *clnt = data;
-	struct cld_msg *cmsg = &clnt->cl_msg;
-
-	if (which != EV_READ)
-		goto out;
-
-	len = atomicio(read, clnt->cl_fd, cmsg, sizeof(*cmsg));
-	if (len <= 0) {
-		xlog(L_ERROR, "%s: pipe read failed: %m", __func__);
-		cld_pipe_open(clnt);
-		goto out;
-	}
-
-	if (cmsg->cm_vers != UPCALL_VERSION) {
-		xlog(L_ERROR, "%s: unsupported upcall version: %hu",
-				cmsg->cm_vers);
-		cld_pipe_open(clnt);
-		goto out;
-	}
-
-	switch(cmsg->cm_cmd) {
-	case Cld_Create:
-		cld_create(clnt);
-		break;
-	case Cld_Remove:
-		cld_remove(clnt);
-		break;
-	case Cld_Check:
-		cld_check(clnt);
-		break;
-	case Cld_GraceDone:
-		cld_gracedone(clnt);
-		break;
-	default:
-		xlog(L_WARNING, "%s: command %u is not yet implemented",
-				__func__, cmsg->cm_cmd);
-		cld_not_implemented(clnt);
-	}
-out:
-	event_add(&clnt->cl_event, NULL);
-}
-
-int
-main(int argc, char **argv)
-{
-	char arg;
-	int rc = 0;
-	bool foreground = false;
-	char *progname;
-	char *storagedir = CLD_DEFAULT_STORAGEDIR;
-	struct cld_client clnt;
-
-	memset(&clnt, 0, sizeof(clnt));
-
-	progname = strdup(basename(argv[0]));
-	if (!progname) {
-		fprintf(stderr, "%s: unable to allocate memory.\n", argv[0]);
-		return 1;
-	}
-
-	event_init();
-	xlog_syslog(0);
-	xlog_stderr(1);
-
-	/* process command-line options */
-	while ((arg = getopt_long(argc, argv, "hdFp:s:", longopts,
-				  NULL)) != EOF) {
-		switch (arg) {
-		case 'd':
-			xlog_config(D_ALL, 1);
-			break;
-		case 'F':
-			foreground = true;
-			break;
-		case 'p':
-			pipepath = optarg;
-			break;
-		case 's':
-			storagedir = optarg;
-			break;
-		default:
-			usage(progname);
-			return 0;
-		}
-	}
-
-
-	xlog_open(progname);
-	if (!foreground) {
-		xlog_syslog(1);
-		xlog_stderr(0);
-		rc = daemon(0, 0);
-		if (rc) {
-			xlog(L_ERROR, "Unable to daemonize: %m");
-			goto out;
-		}
-	}
-
-	/* drop all capabilities */
-	rc = cld_set_caps();
-	if (rc)
-		goto out;
-
-	/*
-	 * now see if the storagedir is writable by root w/o CAP_DAC_OVERRIDE.
-	 * If it isn't then give the user a warning but proceed as if
-	 * everything is OK. If the DB has already been created, then
-	 * everything might still work. If it doesn't exist at all, then
-	 * assume that the maindb init will be able to create it. Fail on
-	 * anything else.
-	 */
-	if (access(storagedir, W_OK) == -1) {
-		switch (errno) {
-		case EACCES:
-			xlog(L_WARNING, "Storage directory %s is not writable. "
-					"Should be owned by root and writable "
-					"by owner!", storagedir);
-			break;
-		case ENOENT:
-			/* ignore and assume that we can create dir as root */
-			break;
-		default:
-			xlog(L_ERROR, "Unexpected error when checking access "
-				      "on %s: %m", storagedir);
-			rc = -errno;
-			goto out;
-		}
-	}
-
-	/* set up storage db */
-	rc = sqlite_maindb_init(storagedir);
-	if (rc) {
-		xlog(L_ERROR, "Failed to open main database: %d", rc);
-		goto out;
-	}
-
-	/* set up event handler */
-	rc = cld_pipe_init(&clnt);
-	if (rc)
-		goto out;
-
-	xlog(D_GENERAL, "%s: Starting event dispatch handler.", __func__);
-	rc = event_dispatch();
-	if (rc < 0)
-		xlog(L_ERROR, "%s: event_dispatch failed: %m", __func__);
-
-	close(clnt.cl_fd);
-	close(inotify_fd);
-out:
-	free(progname);
-	return rc;
-}
diff --git a/utils/nfsdcltrack/nfsdcld.man b/utils/nfsdcltrack/nfsdcld.man
deleted file mode 100644
index 9ddaf64..0000000
--- a/utils/nfsdcltrack/nfsdcld.man
+++ /dev/null
@@ -1,185 +0,0 @@
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-.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
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-.tr \(*W-
-.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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-.el       .ds Aq '
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-.\" ========================================================================
-.\"
-.IX Title "NFSDCLD 8"
-.TH NFSDCLD 8 "2011-12-21" "" ""
-.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
-.\" way too many mistakes in technical documents.
-.if n .ad l
-.nh
-.SH "NAME"
-nfsdcld \- NFSv4 Client Tracking Daemon
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-nfsdcld [\-d] [\-F] [\-p path] [\-s stable storage dir]
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-nfsdcld is the NFSv4 client tracking daemon. It is not necessary to run
-this daemon on machines that are not acting as NFSv4 servers.
-.PP
-When a network partition is combined with a server reboot, there are
-edge conditions that can cause the server to grant lock reclaims when
-other clients have taken conflicting locks in the interim. A more detailed
-explanation of this issue is described in \s-1RFC\s0 3530, section 8.6.3.
-.PP
-In order to prevent these problems, the server must track a small amount
-of per-client information on stable storage. This daemon provides the
-userspace piece of that functionality.
-.SH "OPTIONS"
-.IX Header "OPTIONS"
-.IP "\fB\-d\fR, \fB\-\-debug\fR" 4
-.IX Item "-d, --debug"
-Enable debug level logging.
-.IP "\fB\-F\fR, \fB\-\-foreground\fR" 4
-.IX Item "-F, --foreground"
-Runs the daemon in the foreground and prints all output to stderr
-.IP "\fB\-p\fR \fIpipe\fR, \fB\-\-pipe\fR=\fIpipe\fR" 4
-.IX Item "-p pipe, --pipe=pipe"
-Location of the \*(L"cld\*(R" upcall pipe. The default value is
-\&\fI/var/lib/nfs/rpc_pipefs/nfsd/cld\fR. If the pipe does not exist when the
-daemon starts then it will wait for it to be created.
-.IP "\fB\-s\fR \fIstorage_dir\fR, \fB\-\-storagedir\fR=\fIstorage_dir\fR" 4
-.IX Item "-s storagedir, --storagedir=storage_dir"
-Directory where stable storage information should be kept. The default
-value is \fI/var/lib/nfs/nfsdcld\fR.
-.SH "NOTES"
-.IX Header "NOTES"
-The Linux kernel NFSv4 server has historically tracked this information
-on stable storage by manipulating information on the filesystem
-directly, in the directory to which \fI/proc/fs/nfsd/nfsv4recoverydir\fR
-points.
-.PP
-This daemon requires a kernel that supports the nfsdcld upcall. If the
-kernel does not support the new upcall, or is using the legacy client
-name tracking code then it will not create the pipe that nfsdcld uses to
-talk to the kernel.
-.PP
-This daemon should be run as root, as the pipe that it uses to communicate
-with the kernel is only accessable by root. The daemon however does drop all
-superuser capabilities after starting. Because of this, the \fIstoragedir\fR
-should be owned by root, and be readable and writable by owner.
-.SH "AUTHORS"
-.IX Header "AUTHORS"
-The nfsdcld daemon was developed by Jeff Layton <jlayton@redhat.com>.