610 lines
16 KiB
C
610 lines
16 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <limits.h>
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#include <sys/mount.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/epoll.h>
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#include <sys/stat.h>
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#include <linux/auto_fs4.h>
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#include <linux/auto_dev-ioctl.h>
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#include "unit.h"
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#include "automount.h"
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#include "load-fragment.h"
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#include "load-dropin.h"
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#include "unit-name.h"
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#include "dbus-automount.h"
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static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
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[AUTOMOUNT_DEAD] = UNIT_INACTIVE,
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[AUTOMOUNT_WAITING] = UNIT_ACTIVE,
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[AUTOMOUNT_RUNNING] = UNIT_ACTIVE,
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[AUTOMOUNT_MAINTAINANCE] = UNIT_INACTIVE,
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};
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static const char* const state_string_table[_AUTOMOUNT_STATE_MAX] = {
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[AUTOMOUNT_DEAD] = "dead",
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[AUTOMOUNT_WAITING] = "waiting",
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[AUTOMOUNT_RUNNING] = "running",
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[AUTOMOUNT_MAINTAINANCE] = "maintainance"
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};
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static char *automount_name_from_where(const char *where) {
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assert(where);
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if (streq(where, "/"))
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return strdup("-.automount");
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return unit_name_build_escape(where+1, NULL, ".automount");
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}
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static void automount_init(Unit *u) {
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Automount *a = AUTOMOUNT(u);
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assert(u);
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assert(u->meta.load_state == UNIT_STUB);
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a->pipe_watch.fd = a->pipe_fd = -1;
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}
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static void repeat_unmout(const char *path) {
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assert(path);
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for (;;) {
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if (umount2(path, MNT_DETACH) >= 0)
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continue;
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if (errno != EINVAL)
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log_error("Failed to unmount: %m");
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break;
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}
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}
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static void unmount_autofs(Automount *a) {
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assert(a);
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if (a->pipe_fd < 0)
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return;
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automount_send_ready(a, -EHOSTDOWN);
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unit_unwatch_fd(UNIT(a), &a->pipe_watch);
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close_nointr_nofail(a->pipe_fd);
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a->pipe_fd = -1;
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repeat_unmout(a->where);
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}
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static void automount_done(Unit *u) {
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Automount *a = AUTOMOUNT(u);
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assert(a);
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unmount_autofs(a);
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a->mount = NULL;
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if (a->tokens) {
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set_free(a->tokens);
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a->tokens = NULL;
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}
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}
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static int automount_verify(Automount *a) {
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bool b;
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char *e;
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assert(a);
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if (UNIT(a)->meta.load_state != UNIT_LOADED)
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return 0;
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if (!a->where) {
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log_error("%s lacks Where setting. Refusing.", UNIT(a)->meta.id);
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return -EINVAL;
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}
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path_kill_slashes(a->where);
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if (!(e = automount_name_from_where(a->where)))
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return -ENOMEM;
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b = unit_has_name(UNIT(a), e);
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free(e);
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if (!b) {
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log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(a)->meta.id);
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return -EINVAL;
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}
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return 0;
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}
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static int automount_load(Unit *u) {
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int r;
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Automount *a = AUTOMOUNT(u);
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assert(u);
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assert(u->meta.load_state == UNIT_STUB);
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/* Load a .automount file */
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if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
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return r;
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if (u->meta.load_state == UNIT_LOADED) {
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if ((r = unit_load_related_unit(u, ".mount", (Unit**) &a->mount)) < 0)
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return r;
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if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(a->mount))) < 0)
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return r;
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}
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return automount_verify(a);
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}
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static void automount_set_state(Automount *a, AutomountState state) {
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AutomountState old_state;
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assert(a);
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old_state = a->state;
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a->state = state;
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if (state != AUTOMOUNT_WAITING &&
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state != AUTOMOUNT_RUNNING)
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unmount_autofs(a);
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if (state != old_state)
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log_debug("%s changed %s → %s", UNIT(a)->meta.id, state_string_table[old_state], state_string_table[state]);
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unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state]);
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}
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static void automount_dump(Unit *u, FILE *f, const char *prefix) {
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Automount *s = AUTOMOUNT(u);
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assert(s);
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fprintf(f,
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"%sAutomount State: %s\n",
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prefix, state_string_table[s->state]);
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}
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static void automount_enter_dead(Automount *a, bool success) {
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assert(a);
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if (!success)
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a->failure = true;
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automount_set_state(a, a->failure ? AUTOMOUNT_MAINTAINANCE : AUTOMOUNT_DEAD);
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}
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static int open_dev_autofs(Manager *m) {
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struct autofs_dev_ioctl param;
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assert(m);
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if (m->dev_autofs_fd >= 0)
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return m->dev_autofs_fd;
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if ((m->dev_autofs_fd = open("/dev/autofs", O_RDONLY)) < 0) {
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log_error("Failed to open /dev/autofs: %s", strerror(errno));
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return -errno;
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}
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init_autofs_dev_ioctl(¶m);
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if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) {
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close_nointr_nofail(m->dev_autofs_fd);
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m->dev_autofs_fd = -1;
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return -errno;
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}
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log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor);
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return m->dev_autofs_fd;
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}
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static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) {
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struct autofs_dev_ioctl *param;
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size_t l;
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int r;
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assert(dev_autofs_fd >= 0);
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assert(where);
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l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1;
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if (!(param = malloc(l)))
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return -ENOMEM;
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init_autofs_dev_ioctl(param);
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param->size = l;
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param->ioctlfd = -1;
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param->openmount.devid = devid;
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strcpy(param->path, where);
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if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) {
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r = -errno;
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goto finish;
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}
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if (param->ioctlfd < 0) {
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r = -EIO;
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goto finish;
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}
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r = param->ioctlfd;
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finish:
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free(param);
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return r;
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}
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static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) {
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uint32_t major, minor;
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struct autofs_dev_ioctl param;
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assert(dev_autofs_fd >= 0);
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assert(ioctl_fd >= 0);
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init_autofs_dev_ioctl(¶m);
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param.ioctlfd = ioctl_fd;
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if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0)
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return -errno;
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major = param.protover.version;
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init_autofs_dev_ioctl(¶m);
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param.ioctlfd = ioctl_fd;
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if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0)
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return -errno;
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minor = param.protosubver.sub_version;
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log_debug("Autofs protocol version %i.%i", major, minor);
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return 0;
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}
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static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) {
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struct autofs_dev_ioctl param;
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assert(dev_autofs_fd >= 0);
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assert(ioctl_fd >= 0);
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init_autofs_dev_ioctl(¶m);
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param.ioctlfd = ioctl_fd;
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param.timeout.timeout = sec;
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if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m) < 0)
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return -errno;
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return 0;
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}
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static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) {
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struct autofs_dev_ioctl param;
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assert(dev_autofs_fd >= 0);
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assert(ioctl_fd >= 0);
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init_autofs_dev_ioctl(¶m);
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param.ioctlfd = ioctl_fd;
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if (status) {
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param.fail.token = token;
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param.fail.status = status;
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} else
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param.ready.token = token;
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if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m) < 0)
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return -errno;
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return 0;
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}
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int automount_send_ready(Automount *a, int status) {
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int ioctl_fd, r;
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unsigned token;
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assert(a);
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assert(status <= 0);
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if (set_isempty(a->tokens))
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return 0;
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if ((ioctl_fd = open_ioctl_fd(UNIT(a)->meta.manager->dev_autofs_fd, a->where, a->dev_id)) < 0) {
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r = ioctl_fd;
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goto fail;
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}
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if (status)
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log_debug("Sending failure: %s", strerror(-status));
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else
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log_debug("Sending success.");
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/* Autofs thankfully does not hand out 0 as a token */
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while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) {
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int k;
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/* Autofs fun fact II:
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*
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* if you pass a positive status code here, the kernel will
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* freeze! Yay! */
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if ((k = autofs_send_ready(UNIT(a)->meta.manager->dev_autofs_fd,
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ioctl_fd,
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token,
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status)) < 0)
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r = k;
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}
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r = 0;
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fail:
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if (ioctl_fd >= 0)
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close_nointr_nofail(ioctl_fd);
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return r;
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}
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static void automount_enter_waiting(Automount *a) {
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int p[2] = { -1, -1 };
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char name[32], options[128];
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bool mounted = false;
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int r, ioctl_fd = -1, dev_autofs_fd;
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struct stat st;
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assert(a);
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assert(a->pipe_fd < 0);
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assert(a->where);
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if (a->tokens)
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set_clear(a->tokens);
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else if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) {
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r = -ENOMEM;
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goto fail;
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}
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if ((dev_autofs_fd = open_dev_autofs(UNIT(a)->meta.manager)) < 0) {
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r = dev_autofs_fd;
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goto fail;
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}
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/* We knowingly ignore the results of this call */
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mkdir_p(a->where, 0555);
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if (pipe2(p, O_NONBLOCK) < 0) {
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r = -errno;
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goto fail;
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}
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snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp());
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char_array_0(options);
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snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid());
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char_array_0(name);
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if (mount(name, a->where, "autofs", 0, options) < 0) {
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r = -errno;
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goto fail;
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}
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mounted = true;
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close_nointr_nofail(p[1]);
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p[1] = -1;
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if (stat(a->where, &st) < 0) {
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r = -errno;
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goto fail;
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}
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if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) {
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r = ioctl_fd;
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goto fail;
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}
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if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0)
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goto fail;
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if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0)
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goto fail;
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/* Autofs fun fact:
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*
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* Unless we close the ioctl fd here, for some weird reason
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* the direct mount will not receive events from the
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* kernel. */
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close_nointr_nofail(ioctl_fd);
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ioctl_fd = -1;
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if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0)
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goto fail;
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a->pipe_fd = p[0];
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a->dev_id = st.st_dev;
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automount_set_state(a, AUTOMOUNT_WAITING);
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return;
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fail:
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assert_se(close_pipe(p) == 0);
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if (ioctl_fd >= 0)
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close_nointr_nofail(ioctl_fd);
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if (mounted)
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repeat_unmout(a->where);
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log_error("Failed to initialize automounter: %s", strerror(-r));
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automount_enter_dead(a, false);
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}
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static void automount_enter_runnning(Automount *a) {
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int r;
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struct stat st;
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assert(a);
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assert(a->mount);
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/* Before we do anything, let's see if somebody is playing games with us? */
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if (stat(a->where, &st) < 0) {
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log_warning("%s failed stat automount point: %m", a->meta.id);
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goto fail;
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}
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if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
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log_info("%s's automount point already active?", a->meta.id);
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else if ((r = manager_add_job(UNIT(a)->meta.manager, JOB_START, UNIT(a->mount), JOB_REPLACE, true, NULL)) < 0) {
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log_warning("%s failed to queue mount startup job: %s", a->meta.id, strerror(-r));
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goto fail;
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}
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automount_set_state(a, AUTOMOUNT_RUNNING);
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return;
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fail:
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automount_enter_dead(a, false);
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}
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static int automount_start(Unit *u) {
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Automount *a = AUTOMOUNT(u);
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assert(a);
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if (path_is_mount_point(a->where)) {
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log_error("Path %s is already a mount point, refusing start for %s", a->where, u->meta.id);
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return -EEXIST;
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}
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assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_MAINTAINANCE);
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a->failure = false;
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automount_enter_waiting(a);
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return 0;
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}
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static int automount_stop(Unit *u) {
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Automount *a = AUTOMOUNT(u);
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assert(a);
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assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING);
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automount_enter_dead(a, true);
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return 0;
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}
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static UnitActiveState automount_active_state(Unit *u) {
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return state_translation_table[AUTOMOUNT(u)->state];
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}
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static const char *automount_sub_state_to_string(Unit *u) {
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assert(u);
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return state_string_table[AUTOMOUNT(u)->state];
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}
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static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
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union autofs_v5_packet_union packet;
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ssize_t l;
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int r;
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Automount *a = AUTOMOUNT(u);
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assert(a);
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assert(fd == a->pipe_fd);
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if (events != EPOLLIN) {
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log_error("Got invalid poll event on pipe.");
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goto fail;
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}
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if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet))) != sizeof(packet)) {
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log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read");
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goto fail;
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}
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|
switch (packet.hdr.type) {
|
|
|
|
case autofs_ptype_missing_direct:
|
|
log_debug("Got direct mount request for %s", packet.v5_packet.name);
|
|
|
|
if ((r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token))) < 0) {
|
|
log_error("Failed to remember token: %s", strerror(-r));
|
|
goto fail;
|
|
}
|
|
|
|
automount_enter_runnning(a);
|
|
break;
|
|
|
|
default:
|
|
log_error("Received unknown automount request %i", packet.hdr.type);
|
|
break;
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
automount_enter_dead(a, false);
|
|
}
|
|
|
|
static void automount_shutdown(Manager *m) {
|
|
assert(m);
|
|
|
|
if (m->dev_autofs_fd >= 0)
|
|
close_nointr_nofail(m->dev_autofs_fd);
|
|
}
|
|
|
|
const UnitVTable automount_vtable = {
|
|
.suffix = ".automount",
|
|
|
|
.no_alias = true,
|
|
.no_instances = true,
|
|
|
|
.init = automount_init,
|
|
.load = automount_load,
|
|
.done = automount_done,
|
|
|
|
.dump = automount_dump,
|
|
|
|
.start = automount_start,
|
|
.stop = automount_stop,
|
|
|
|
.active_state = automount_active_state,
|
|
.sub_state_to_string = automount_sub_state_to_string,
|
|
|
|
.fd_event = automount_fd_event,
|
|
|
|
.bus_message_handler = bus_automount_message_handler,
|
|
|
|
.shutdown = automount_shutdown
|
|
};
|