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add initrd-fs.target and root-fs.target

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Instead of using local-fs*.target in the initrd, use root-fs.target for
sysroot.mount and initrd-fs.target for /sysroot/usr and friends.

Using local-fs.target would mean to carry over the activated
local-fs.target to the isolated initrd-switch-root.target and thus in
the real root. Having local-fs.target already active after
deserialization causes ordering problems with the real root services and
targets.

We better isolate to targets for initrd-switch-root.target, which are
only available in the initrd.
This commit is contained in:
Harald Hoyer 2013-03-04 19:01:05 +01:00
parent 783162123d
commit 700e07ffd5
9 changed files with 110 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile.am
View File

@ -347,6 +347,8 @@ dist_systemunit_DATA = \
units/kexec.target \
units/local-fs.target \
units/local-fs-pre.target \
units/initrd-fs.target \
units/root-fs.target \
units/remote-fs.target \
units/remote-fs-pre.target \
units/network.target \

30
man/systemd.special.xml
View File

@ -64,6 +64,7 @@
<filename>halt.target</filename>,
<filename>hibernate.target</filename>,
<filename>hybrid-sleep.target</filename>,
<filename>initrd-fs.target</filename>,
<filename>kbrequest.target</filename>,
<filename>kexec.target</filename>,
<filename>local-fs.target</filename>,
@ -78,6 +79,7 @@
<filename>remote-fs.target</filename>,
<filename>remote-fs-pre.target</filename>,
<filename>rescue.target</filename>,
<filename>root-fs.target</filename>,
<filename>rpcbind.target</filename>,
<filename>runlevel2.target</filename>,
<filename>runlevel3.target</filename>,
@ -295,6 +297,22 @@
this unit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>initrd-fs.target</filename></term>
<listitem>
<para>systemd automatically
adds dependencies of type
Before to sysroot-usr.mount and
all mount points fround in
<filename>/etc/fstab</filename>
that have the
<option>auto</option> and
<option>x-initrd.mount</option>
mount options set.
See also <literal>systemd-fstab-generator</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>kbrequest.target</filename></term>
<listitem>
@ -504,6 +522,17 @@
unit, for compatibility with SysV.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>root-fs.target</filename></term>
<listitem>
<para>systemd automatically
adds dependencies of type
Before to the sysroot.mount unit,
which is generated from the kernel command
line by the <literal>systemd-fstab-generator</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>rpcbind.target</filename></term>
<listitem>
@ -760,6 +789,7 @@
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry>
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>

2
src/core/special.h
View File

@ -48,6 +48,8 @@
#define SPECIAL_SOCKETS_TARGET "sockets.target"
#define SPECIAL_LOCAL_FS_TARGET "local-fs.target"
#define SPECIAL_LOCAL_FS_PRE_TARGET "local-fs-pre.target"
#define SPECIAL_INITRD_FS_TARGET "initrd-fs.target"
#define SPECIAL_ROOT_FS_TARGET "root-fs.target"
#define SPECIAL_REMOTE_FS_TARGET "remote-fs.target" /* LSB's $remote_fs */
#define SPECIAL_REMOTE_FS_PRE_TARGET "remote-fs-pre.target"
#define SPECIAL_SWAP_TARGET "swap.target"

79
src/fstab-generator/fstab-generator.c
View File

@ -200,14 +200,13 @@ static bool mount_in_initrd(struct mntent *me) {
}
static int add_mount(const char *what, const char *where, const char *type, const char *opts,
int passno, bool noauto, bool nofail, bool automount, bool isbind, bool isnetwork,
const char *source) {
int passno, bool noauto, bool nofail, bool automount, bool isbind,
const char *pre, const char *post, const char *source) {
char _cleanup_free_
*name = NULL, *unit = NULL, *lnk = NULL, *device = NULL,
*automount_name = NULL, *automount_unit = NULL;
FILE _cleanup_fclose_ *f = NULL;
int r;
const char *post, *pre;
assert(what);
assert(where);
@ -227,14 +226,6 @@ static int add_mount(const char *what, const char *where, const char *type, cons
mount_point_ignore(where))
return 0;
if (isnetwork) {
post = SPECIAL_REMOTE_FS_TARGET;
pre = SPECIAL_REMOTE_FS_PRE_TARGET;
} else {
post = SPECIAL_LOCAL_FS_TARGET;
pre = SPECIAL_LOCAL_FS_PRE_TARGET;
}
name = unit_name_from_path(where, ".mount");
if (!name)
return log_oom();
@ -259,17 +250,19 @@ static int add_mount(const char *what, const char *where, const char *type, cons
"DefaultDependencies=no\n",
source);
if (!path_equal(where, "/"))
if (!path_equal(where, "/")) {
if (pre)
fprintf(f,
"After=%s\n"
"Wants=%s\n",
pre,
pre);
fprintf(f,
"After=%s\n"
"Wants=%s\n"
"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
"Before=" SPECIAL_UMOUNT_TARGET "\n",
pre,
pre);
"Before=" SPECIAL_UMOUNT_TARGET "\n");
}
if (!noauto && !nofail && !automount)
if (post && !noauto && !nofail && !automount)
fprintf(f,
"Before=%s\n",
post);
@ -299,14 +292,16 @@ static int add_mount(const char *what, const char *where, const char *type, cons
}
if (!noauto) {
lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
if (!lnk)
return log_oom();
if (post) {
lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
if (!lnk)
return log_oom();
mkdir_parents_label(lnk, 0755);
if (symlink(unit, lnk) < 0) {
log_error("Failed to create symlink %s: %m", lnk);
return -errno;
mkdir_parents_label(lnk, 0755);
if (symlink(unit, lnk) < 0) {
log_error("Failed to create symlink %s: %m", lnk);
return -errno;
}
}
if (!isbind &&
@ -353,12 +348,17 @@ static int add_mount(const char *what, const char *where, const char *type, cons
"SourcePath=%s\n"
"DefaultDependencies=no\n"
"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
"Before=" SPECIAL_UMOUNT_TARGET " %s\n"
"\n"
"Before=" SPECIAL_UMOUNT_TARGET "\n",
source);
if (post)
fprintf(f,
"Before= %s\n",
post);
fprintf(f,
"[Automount]\n"
"Where=%s\n",
source,
post,
where);
fflush(f);
@ -421,7 +421,8 @@ static int parse_fstab(const char *prefix, bool initrd) {
if (streq(me->mnt_type, "swap"))
k = add_swap(what, me);
else {
bool noauto, nofail, automount, isbind, isnetwork;
bool noauto, nofail, automount, isbind;
const char *pre, *post;
noauto = !!hasmntopt(me, "noauto");
nofail = !!hasmntopt(me, "nofail");
@ -429,11 +430,21 @@ static int parse_fstab(const char *prefix, bool initrd) {
hasmntopt(me, "comment=systemd.automount") ||
hasmntopt(me, "x-systemd.automount");
isbind = mount_is_bind(me);
isnetwork = mount_is_network(me);
if (initrd) {
post = SPECIAL_INITRD_FS_TARGET;
pre = NULL;
} else if (mount_is_network(me)) {
post = SPECIAL_REMOTE_FS_TARGET;
pre = SPECIAL_REMOTE_FS_PRE_TARGET;
} else {
post = SPECIAL_LOCAL_FS_TARGET;
pre = SPECIAL_LOCAL_FS_PRE_TARGET;
}
k = add_mount(what, where, me->mnt_type, me->mnt_opts,
me->mnt_passno, noauto, nofail, automount,
isbind, isnetwork, fstab_path);
isbind, pre, post, fstab_path);
}
if (k < 0)
@ -514,7 +525,7 @@ static int parse_new_root_from_proc_cmdline(void) {
log_debug("Found entry what=%s where=/sysroot type=%s", what, type);
r = add_mount(what, "/sysroot", type, opts, 0, false, false, false,
false, false, "/proc/cmdline");
false, NULL, SPECIAL_ROOT_FS_TARGET, "/proc/cmdline");
return (r < 0) ? r : 0;
}

4
units/initrd-cleanup.service.in
View File

@ -10,8 +10,8 @@ Description=Cleaning Up and Shutting Down Daemons
DefaultDependencies=no
ConditionPathExists=/etc/initrd-release
OnFailure=emergency.target
Requires=local-fs.target swap.target
After=local-fs.target swap.target
Wants=root-fs.target initrd-fs.target
After=root-fs.target initrd-fs.target
[Service]
Type=oneshot

13
units/initrd-fs.target Normal file
View File

@ -0,0 +1,13 @@
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Initrd File Systems
Documentation=man:systemd.special(7)
OnFailure=emergency.target
OnFailureIsolate=yes
ConditionPathExists=/etc/initrd-release

6
units/initrd-parse-etc.service.in
View File

@ -8,13 +8,13 @@
[Unit]
Description=Reload Configuration from the Real Root
DefaultDependencies=no
Requires=local-fs.target swap.target
After=local-fs.target swap.target
Requires=root-fs.target
After=root-fs.target
OnFailure=emergency.target
ConditionPathExists=/etc/initrd-release
[Service]
Type=oneshot
ExecStartPre=@rootbindir@/systemctl daemon-reload
ExecStart=@rootbindir@/systemctl start local-fs.target
ExecStart=@rootbindir@/systemctl start initrd-fs.target
ExecStart=@rootbindir@/systemctl --no-block start initrd-cleanup.service

4
units/initrd-switch-root.target
View File

@ -12,5 +12,5 @@ DefaultDependencies=no
Requires=initrd-switch-root.service
Before=initrd-switch-root.service
AllowIsolate=yes
Wants=initrd-udevadm-cleanup-db.service local-fs.target swap.target systemd-journald.service
After=initrd-udevadm-cleanup-db.service local-fs.target swap.target emergency.service emergency.target
Wants=initrd-udevadm-cleanup-db.service root-fs.target initrd-fs.target systemd-journald.service
After=initrd-udevadm-cleanup-db.service root-fs.target initrd-fs.target emergency.service emergency.target

11
units/root-fs.target Normal file
View File

@ -0,0 +1,11 @@
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Initrd Root File System
Documentation=man:systemd.special(7)
ConditionPathExists=/etc/initrd-release