The nfs.conf has config options for the rpc_pipefs mountpoint.
Currently, changing these from the default also requires manually
overriding the systemd unit files that are hard-coded to mount the
filesystem on /var/lib/nfs/rpc_pipefs.
This patch adds a generator that creates a mount unit file for the
rpc_pipefs when a non-default value is specified in /etc/nfs.conf, as
well as a target unit file to override the dependencies for the systemd
units using the rpc_pipefs. The blkmapd, idmapd, and gssd service unit
files have been modified to define their dependencies on the rpc_pipefs
mountpoint indirectly via the rpc_pipefs target unit file. Since both
rpc-pipefs-generator.c and nfs-server-generator.c need to convert path
names to unit file names, that functionality has been moved to
systemd.c.
This patch also removes the dependency on the rpc_pipefs from the
rpc-svcgssd.service unit file. rpc.svcgssd uses the sunrpc cache
mechanism to exchange data with the kernel, not the rpc_pipefs.
Signed-off-by: Scott Mayhew <smayhew@xxxxxxxxxx>
---
.gitignore | 1 +
systemd/Makefile.am | 14 ++++-
systemd/nfs-blkmap.service | 4 +-
systemd/nfs-idmapd.service | 4 +-
systemd/nfs-server-generator.c | 33 +---------
systemd/rpc-gssd.service.in | 4 +-
systemd/rpc-pipefs-generator.c | 138 +++++++++++++++++++++++++++++++++++++++++
systemd/rpc-svcgssd.service | 3 +-
systemd/rpc_pipefs.target | 3 +
systemd/systemd.c | 133 +++++++++++++++++++++++++++++++++++++++
systemd/systemd.h | 6 ++
11 files changed, 302 insertions(+), 41 deletions(-)
create mode 100644 systemd/rpc-pipefs-generator.c
create mode 100644 systemd/rpc_pipefs.target
create mode 100644 systemd/systemd.c
create mode 100644 systemd/systemd.h
diff --git a/.gitignore b/.gitignore
index 126d12c..941aca0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -70,6 +70,7 @@ tests/nsm_client/nlm_sm_inter_svc.c
tests/nsm_client/nlm_sm_inter_xdr.c
utils/nfsidmap/nfsidmap
systemd/nfs-server-generator
+systemd/rpc-pipefs-generator
systemd/nfs-config.service
systemd/rpc-gssd.service
# cscope database files
diff --git a/systemd/Makefile.am b/systemd/Makefile.am
index 0d15b9f..eef53c4 100644
--- a/systemd/Makefile.am
+++ b/systemd/Makefile.am
@@ -4,6 +4,7 @@ MAINTAINERCLEANFILES = Makefile.in
unit_files = \
nfs-client.target \
+ rpc_pipefs.target \
\
nfs-mountd.service \
nfs-server.service \
@@ -42,14 +43,23 @@ EXTRA_DIST = $(unit_files) $(man5_MANS) $(man7_MANS)
unit_dir = /usr/lib/systemd/system
generator_dir = /usr/lib/systemd/system-generators
-EXTRA_PROGRAMS = nfs-server-generator
+EXTRA_PROGRAMS = nfs-server-generator rpc-pipefs-generator
genexecdir = $(generator_dir)
+
+COMMON_SRCS = systemd.c systemd.h
+
+nfs_server_generator_SOURCES = $(COMMON_SRCS) nfs-server-generator.c
+
+rpc_pipefs_generator_SOURCES = $(COMMON_SRCS) rpc-pipefs-generator.c
+
nfs_server_generator_LDADD = ../support/export/libexport.a \
../support/nfs/libnfs.a \
../support/misc/libmisc.a
+rpc_pipefs_generator_LDADD = ../support/nfs/libnfs.a
+
if INSTALL_SYSTEMD
-genexec_PROGRAMS = nfs-server-generator
+genexec_PROGRAMS = nfs-server-generator rpc-pipefs-generator
install-data-hook: $(unit_files)
mkdir -p $(DESTDIR)/$(unitdir)
cp $(unit_files) $(DESTDIR)/$(unitdir)
diff --git a/systemd/nfs-blkmap.service b/systemd/nfs-blkmap.service
index ddc324e..2bbcee6 100644
--- a/systemd/nfs-blkmap.service
+++ b/systemd/nfs-blkmap.service
@@ -2,8 +2,8 @@
Description=pNFS block layout mapping daemon
DefaultDependencies=no
Conflicts=umount.target
-After=var-lib-nfs-rpc_pipefs.mount
-Requires=var-lib-nfs-rpc_pipefs.mount
+After=rpc_pipefs.target
+Requires=rpc_pipefs.target
PartOf=nfs-utils.service
diff --git a/systemd/nfs-idmapd.service b/systemd/nfs-idmapd.service
index acca86b..f38fe52 100644
--- a/systemd/nfs-idmapd.service
+++ b/systemd/nfs-idmapd.service
@@ -1,8 +1,8 @@
[Unit]
Description=NFSv4 ID-name mapping service
DefaultDependencies=no
-Requires=var-lib-nfs-rpc_pipefs.mount
-After=var-lib-nfs-rpc_pipefs.mount local-fs.target
+Requires=rpc_pipefs.target
+After=rpc_pipefs.target local-fs.target
BindsTo=nfs-server.service
diff --git a/systemd/nfs-server-generator.c b/systemd/nfs-server-generator.c
index 4aa6509..ce3d7fd 100644
--- a/systemd/nfs-server-generator.c
+++ b/systemd/nfs-server-generator.c
@@ -29,6 +29,7 @@
#include "misc.h"
#include "nfslib.h"
#include "exportfs.h"
+#include "systemd.h"
/* A simple "set of strings" to remove duplicates
* found in /etc/exports
@@ -55,35 +56,6 @@ static int is_unique(struct list **lp, char *path)
return 1;
}
-/* We need to convert a path name to a systemd unit
- * name. This requires some translation ('/' -> '-')
- * and some escaping.
- */
-static void systemd_escape(FILE *f, char *path)
-{
- while (*path == '/')
- path++;
- if (!*path) {
- /* "/" becomes "-", otherwise leading "/" is ignored */
- fputs("-", f);
- return;
- }
- while (*path) {
- char c = *path++;
-
- if (c == '/') {
- /* multiple non-trailing slashes become '-' */
- while (*path == '/')
- path++;
- if (*path)
- fputs("-", f);
- } else if (isalnum(c) || c == ':' || c == '.')
- fputc(c, f);
- else
- fprintf(f, "\\x%02x", c & 0xff);
- }
-}
-
static int has_noauto_flag(char *path)
{
FILE *fstab;
@@ -168,8 +140,7 @@ int main(int argc, char *argv[])
strcmp(mnt->mnt_type, "nfs4") != 0)
continue;
fprintf(f, "Before= ");
- systemd_escape(f, mnt->mnt_dir);
- fprintf(f, ".mount\n");
+ fprintf(f, "%s\n", systemd_escape(mnt->mnt_dir, ".mount"));
}
fclose(fstab);
diff --git a/systemd/rpc-gssd.service.in b/systemd/rpc-gssd.service.in
index b353027..6807db3 100644
--- a/systemd/rpc-gssd.service.in
+++ b/systemd/rpc-gssd.service.in
@@ -2,8 +2,8 @@
Description=RPC security service for NFS client and server
DefaultDependencies=no
Conflicts=umount.target
-Requires=var-lib-nfs-rpc_pipefs.mount
-After=var-lib-nfs-rpc_pipefs.mount
+Requires=rpc_pipefs.target
+After=rpc_pipefs.target
ConditionPathExists=@_sysconfdir@/krb5.keytab
diff --git a/systemd/rpc-pipefs-generator.c b/systemd/rpc-pipefs-generator.c
new file mode 100644
index 0000000..66addb9
--- /dev/null
+++ b/systemd/rpc-pipefs-generator.c
@@ -0,0 +1,138 @@
+/*
+ * rpc-pipefs-generator:
+ * systemd generator to create ordering dependencies between
+ * nfs services and the rpc_pipefs mountpoint
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <mntent.h>
+
+#include "nfslib.h"
+#include "conffile.h"
+#include "systemd.h"
+
+#define RPC_PIPEFS_DEFAULT "/var/lib/nfs/rpc_pipefs"
+char *conf_path = NFS_CONFFILE;
+
+static int generate_mount_unit(const char *pipefs_path, const char *pipefs_unit,
+ const char *dirname)
+{
+ char *path;
+ FILE *f;
+
+ path = malloc(strlen(dirname) + 1 + strlen(pipefs_unit));
+ if (!path)
+ return 1;
+ sprintf(path, "%s/%s", dirname, pipefs_unit);
+ f = fopen(path, "w");
+ if (!f)
+ return 1;
+
+ fprintf(f, "# Automatically generated by rpc-pipefs-generator\n\n[Unit]\n");
+ fprintf(f, "Description=RPC Pipe File System\n");
+ fprintf(f, "DefaultDependencies=no\n");
+ fprintf(f, "After=systemd-tmpfiles-setup.service\n");
+ fprintf(f, "Conflicts=umount.target\n");
+ fprintf(f, "\n[Mount]\n");
+ fprintf(f, "What=sunrpc\n");
+ fprintf(f, "Where=%s\n", pipefs_path);
+ fprintf(f, "Type=rpc_pipefs\n");
+
+ fclose(f);
+ return 0;
+}
+
+static
+int generate_target(char *pipefs_path, const char *dirname)
+{
+ char *path;
+ char filebase[] = "/rpc_pipefs.target";
+ char *pipefs_unit;
+ FILE *f;
+ int ret = 0;
+
+ pipefs_unit = systemd_escape(pipefs_path, ".mount");
+ if (!pipefs_unit)
+ return 1;
+
+ ret = generate_mount_unit(pipefs_path, pipefs_unit, dirname);
+ if (ret)
+ return ret;
+
+ path = malloc(strlen(dirname) + 1 + sizeof(filebase));
+ if (!path)
+ return 2;
+ sprintf(path, "%s", dirname);
+ mkdir(path, 0755);
+ strcat(path, filebase);
+ f = fopen(path, "w");
+ if (!f)
+ return 1;
+
+ fprintf(f, "# Automatically generated by rpc-pipefs-generator\n\n[Unit]\n");
+ fprintf(f, "Requires=%s\n", pipefs_unit);
+ fprintf(f, "After=%s\n", pipefs_unit);
+ fclose(f);
+
+ return 0;
+}
+
+static int is_non_pipefs_mountpoint(char *path)
+{
+ FILE *mtab;
+ struct mntent *mnt;
+
+ mtab = setmntent("/etc/mtab", "r");
+ if (!mtab)
+ return 0;
+
+ while ((mnt = getmntent(mtab)) != NULL) {
+ if (strlen(mnt->mnt_dir) != strlen(path))
+ continue;
+ if (strncmp(mnt->mnt_dir, path, strlen(mnt->mnt_dir)))
+ continue;
+ if (strncmp(mnt->mnt_type, "rpc_pipefs", strlen(mnt->mnt_type)))
+ break;
+ }
+ fclose(mtab);
+ return mnt != NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ int ret;
+ char *s;
+
+ /* Avoid using any external services */
+ xlog_syslog(0);
+
+ if (argc != 4 || argv[1][0] != '/') {
+ fprintf(stderr, "rpc-pipefs-generator: create systemd dependencies for nfs services\n");
+ fprintf(stderr, "Usage: normal-dir early-dir late-dir\n");
+ exit(1);
+ }
+
+ conf_init();
+ s = conf_get_str("general", "pipefs-directory");
+ if (!s)
+ exit(0);
+ if (strlen(s) == strlen(RPC_PIPEFS_DEFAULT) &&
+ strcmp(s, RPC_PIPEFS_DEFAULT) == 0)
+ exit(0);
+
+ if (is_non_pipefs_mountpoint(s))
+ exit(1);
+
+ ret = generate_target(s, argv[1]);
+ exit(ret);
+}
diff --git a/systemd/rpc-svcgssd.service b/systemd/rpc-svcgssd.service
index 7187e3c..cb2bcd4 100644
--- a/systemd/rpc-svcgssd.service
+++ b/systemd/rpc-svcgssd.service
@@ -1,8 +1,7 @@
[Unit]
Description=RPC security service for NFS server
DefaultDependencies=no
-Requires=var-lib-nfs-rpc_pipefs.mount
-After=var-lib-nfs-rpc_pipefs.mount local-fs.target
+After=local-fs.target
PartOf=nfs-server.service
PartOf=nfs-utils.service
diff --git a/systemd/rpc_pipefs.target b/systemd/rpc_pipefs.target
new file mode 100644
index 0000000..01d4d27
--- /dev/null
+++ b/systemd/rpc_pipefs.target
@@ -0,0 +1,3 @@
+[Unit]
+Requires=var-lib-nfs-rpc_pipefs.mount
+After=var-lib-nfs-rpc_pipefs.mount
diff --git a/systemd/systemd.c b/systemd/systemd.c
new file mode 100644
index 0000000..e10da52
--- /dev/null
+++ b/systemd/systemd.c
@@ -0,0 +1,133 @@
+/*
+ * Helper functions for systemd generators in nfs-utils.
+ *
+ * Currently just systemd_escape().
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
+static const char hex[16] =
+{
+ '0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
+};
+
+/*
+ * determine length of the string that systemd_escape() needs to allocate
+ */
+static int systemd_len(char *path)
+{
+ char *p;
+ int len = 0;
+
+ p = path;
+ while (*p == '/')
+ /* multiple leading "/" are ignored */
+ p++;
+
+ if (!*p)
+ /* root directory "/" becomes is encoded as a single "-" */
+ return 1;
+
+ if (*p == '.')
+ /*
+ * replace "." with "\x2d" escape sequence if
+ * it's the first character in escaped path
+ * */
+ len += 4;
+
+ while (*p) {
+ unsigned char c = *p++;
+
+ if (c == '/') {
+ /* multiple non-trailing slashes become '-' */
+ while (*p == '/')
+ p++;
+ if (*p)
+ len++;
+ } else if (isalnum(c) || c == ':' || c == '.' || c == '_')
+ /* these characters are not replaced */
+ len++;
+ else
+ /* replace with "\x2d" escape sequence */
+ len += 4;
+ }
+
+ return len;
+}
+
+/*
+ * convert c to "\x2d" escape sequence and append to string
+ * at position p, advancing p
+ */
+static char *hexify(unsigned char c, char *p)
+{
+ *p++ = '\\';
+ *p++ = 'x';
+ *p++ = hex[c >> 4];
+ *p++ = hex[c & 0xf];
+ return p;
+}
+
+/*
+ * convert a path to a unit name according to the logic in systemd.unit(5):
+ *
+ * Basically, given a path, "/" is replaced by "-", and all other
+ * characters which are not ASCII alphanumerics are replaced by C-style
+ * "\x2d" escapes (except that "_" is never replaced and "." is only
+ * replaced when it would be the first character in the escaped path).
+ * The root directory "/" is encoded as single dash, while otherwise the
+ * initial and ending "/" are removed from all paths during
+ * transformation.
+ *
+ * NB: Although the systemd.unit(5) doesn't mention it, the ':' character
+ * is not escaped.
+ */
+char *systemd_escape(char *path, char *suffix)
+{
+ char *result;
+ char *p;
+ int len;
+
+ len = systemd_len(path);
+ result = malloc(len + strlen(suffix) + 1);
+ p = result;
+ while (*path == '/')
+ /* multiple leading "/" are ignored */
+ path++;
+ if (!*path) {
+ /* root directory "/" becomes is encoded as a single "-" */
+ *p++ = '-';
+ goto out;
+ }
+ if (*path == '.')
+ /*
+ * replace "." with "\x2d" escape sequence if
+ * it's the first character in escaped path
+ * */
+ p = hexify(*path++, p);
+
+ while (*path) {
+ unsigned char c = *path++;
+
+ if (c == '/') {
+ /* multiple non-trailing slashes become '-' */
+ while (*path == '/')
+ path++;
+ if (*path)
+ *p++ = '-';
+ } else if (isalnum(c) || c == ':' || c == '.' || c == '_')
+ /* these characters are not replaced */
+ *p++ = c;
+ else
+ /* replace with "\x2d" escape sequence */
+ p = hexify(c, p);
+ }
+
+out:
+ sprintf(p, suffix);
+ return result;
+}
diff --git a/systemd/systemd.h b/systemd/systemd.h
new file mode 100644
index 0000000..25235ec
--- /dev/null
+++ b/systemd/systemd.h
@@ -0,0 +1,6 @@
+#ifndef SYSTEMD_H
+#define SYSTEMD_H
+
+char *systemd_escape(char *path, char *suffix);
+
+#endif /* SYSTEMD_H */
--
2.9.3
--
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