diff options
Diffstat (limited to 'automount.c')
| -rw-r--r-- | automount.c | 784 |
1 files changed, 0 insertions, 784 deletions
diff --git a/automount.c b/automount.c deleted file mode 100644 index 465354f555..0000000000 --- a/automount.c +++ /dev/null @@ -1,784 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8 -*-*/ - -/*** - This file is part of systemd. - - Copyright 2010 Lennart Poettering - - systemd 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. - - systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <limits.h> -#include <sys/mount.h> -#include <unistd.h> -#include <fcntl.h> -#include <sys/epoll.h> -#include <sys/stat.h> -#include <linux/auto_fs4.h> -#include <linux/auto_dev-ioctl.h> - -#include "unit.h" -#include "automount.h" -#include "load-fragment.h" -#include "load-dropin.h" -#include "unit-name.h" -#include "dbus-automount.h" - -static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = { - [AUTOMOUNT_DEAD] = UNIT_INACTIVE, - [AUTOMOUNT_WAITING] = UNIT_ACTIVE, - [AUTOMOUNT_RUNNING] = UNIT_ACTIVE, - [AUTOMOUNT_MAINTAINANCE] = UNIT_INACTIVE, -}; - -static int open_dev_autofs(Manager *m); - -static void automount_init(Unit *u) { - Automount *a = AUTOMOUNT(u); - - assert(u); - assert(u->meta.load_state == UNIT_STUB); - - a->pipe_watch.fd = a->pipe_fd = -1; - a->pipe_watch.type = WATCH_INVALID; -} - -static void repeat_unmout(const char *path) { - assert(path); - - for (;;) { - - if (umount2(path, MNT_DETACH) >= 0) - continue; - - if (errno != EINVAL) - log_error("Failed to unmount: %m"); - - break; - } -} - -static void unmount_autofs(Automount *a) { - assert(a); - - if (a->pipe_fd < 0) - return; - - automount_send_ready(a, -EHOSTDOWN); - - unit_unwatch_fd(UNIT(a), &a->pipe_watch); - close_nointr_nofail(a->pipe_fd); - a->pipe_fd = -1; - - /* If we reload/reexecute things we keep the mount point - * around */ - if (a->where && - (UNIT(a)->meta.manager->exit_code != MANAGER_RELOAD && - UNIT(a)->meta.manager->exit_code != MANAGER_REEXECUTE)) - repeat_unmout(a->where); -} - -static void automount_done(Unit *u) { - Automount *a = AUTOMOUNT(u); - - assert(a); - - unmount_autofs(a); - a->mount = NULL; - - free(a->where); - a->where = NULL; - - set_free(a->tokens); - a->tokens = NULL; -} - -int automount_add_one_mount_link(Automount *a, Mount *m) { - int r; - - assert(a); - assert(m); - - if (a->meta.load_state != UNIT_LOADED || - m->meta.load_state != UNIT_LOADED) - return 0; - - if (!path_startswith(a->where, m->where)) - return 0; - - if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(a), true)) < 0) - return r; - - if ((r = unit_add_dependency(UNIT(a), UNIT_REQUIRES, UNIT(m), true)) < 0) - return r; - - return 0; -} - -static int automount_add_mount_links(Automount *a) { - Meta *other; - int r; - - assert(a); - - LIST_FOREACH(units_per_type, other, a->meta.manager->units_per_type[UNIT_MOUNT]) - if ((r = automount_add_one_mount_link(a, (Mount*) other)) < 0) - return r; - - return 0; -} - -static int automount_verify(Automount *a) { - bool b; - char *e; - assert(a); - - if (UNIT(a)->meta.load_state != UNIT_LOADED) - return 0; - - if (!(e = unit_name_from_path(a->where, ".automount"))) - return -ENOMEM; - - b = unit_has_name(UNIT(a), e); - free(e); - - if (!b) { - log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(a)->meta.id); - return -EINVAL; - } - - return 0; -} - -static int automount_load(Unit *u) { - int r; - Automount *a = AUTOMOUNT(u); - - assert(u); - assert(u->meta.load_state == UNIT_STUB); - - /* Load a .automount file */ - if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) - return r; - - if (u->meta.load_state == UNIT_LOADED) { - - if (!a->where) - if (!(a->where = unit_name_to_path(u->meta.id))) - return -ENOMEM; - - path_kill_slashes(a->where); - - if ((r = automount_add_mount_links(a)) < 0) - return r; - - if ((r = unit_load_related_unit(u, ".mount", (Unit**) &a->mount)) < 0) - return r; - - if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(a->mount), true)) < 0) - return r; - } - - return automount_verify(a); -} - -static void automount_set_state(Automount *a, AutomountState state) { - AutomountState old_state; - assert(a); - - old_state = a->state; - a->state = state; - - if (state != AUTOMOUNT_WAITING && - state != AUTOMOUNT_RUNNING) - unmount_autofs(a); - - if (state != old_state) - log_debug("%s changed %s -> %s", - UNIT(a)->meta.id, - automount_state_to_string(old_state), - automount_state_to_string(state)); - - unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state]); -} - -static int automount_coldplug(Unit *u) { - Automount *a = AUTOMOUNT(u); - int r; - - assert(a); - assert(a->state == AUTOMOUNT_DEAD); - - if (a->deserialized_state != a->state) { - - if ((r = open_dev_autofs(u->meta.manager)) < 0) - return r; - - if (a->deserialized_state == AUTOMOUNT_WAITING || - a->deserialized_state == AUTOMOUNT_RUNNING) { - - assert(a->pipe_fd >= 0); - - if ((r = unit_watch_fd(UNIT(a), a->pipe_fd, EPOLLIN, &a->pipe_watch)) < 0) - return r; - } - - automount_set_state(a, a->deserialized_state); - } - - return 0; -} - -static void automount_dump(Unit *u, FILE *f, const char *prefix) { - Automount *a = AUTOMOUNT(u); - - assert(a); - - fprintf(f, - "%sAutomount State: %s\n" - "%sWhere: %s\n", - prefix, automount_state_to_string(a->state), - prefix, a->where); -} - -static void automount_enter_dead(Automount *a, bool success) { - assert(a); - - if (!success) - a->failure = true; - - automount_set_state(a, a->failure ? AUTOMOUNT_MAINTAINANCE : AUTOMOUNT_DEAD); -} - -static int open_dev_autofs(Manager *m) { - struct autofs_dev_ioctl param; - - assert(m); - - if (m->dev_autofs_fd >= 0) - return m->dev_autofs_fd; - - if ((m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY)) < 0) { - log_error("Failed to open /dev/autofs: %s", strerror(errno)); - return -errno; - } - - init_autofs_dev_ioctl(¶m); - if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) { - close_nointr_nofail(m->dev_autofs_fd); - m->dev_autofs_fd = -1; - return -errno; - } - - log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor); - - return m->dev_autofs_fd; -} - -static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) { - struct autofs_dev_ioctl *param; - size_t l; - int r; - - assert(dev_autofs_fd >= 0); - assert(where); - - l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1; - - if (!(param = malloc(l))) - return -ENOMEM; - - init_autofs_dev_ioctl(param); - param->size = l; - param->ioctlfd = -1; - param->openmount.devid = devid; - strcpy(param->path, where); - - if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) { - r = -errno; - goto finish; - } - - if (param->ioctlfd < 0) { - r = -EIO; - goto finish; - } - - fd_cloexec(param->ioctlfd, true); - r = param->ioctlfd; - -finish: - free(param); - return r; -} - -static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) { - uint32_t major, minor; - struct autofs_dev_ioctl param; - - assert(dev_autofs_fd >= 0); - assert(ioctl_fd >= 0); - - init_autofs_dev_ioctl(¶m); - param.ioctlfd = ioctl_fd; - - if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0) - return -errno; - - major = param.protover.version; - - init_autofs_dev_ioctl(¶m); - param.ioctlfd = ioctl_fd; - - if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0) - return -errno; - - minor = param.protosubver.sub_version; - - log_debug("Autofs protocol version %i.%i", major, minor); - return 0; -} - -static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) { - struct autofs_dev_ioctl param; - - assert(dev_autofs_fd >= 0); - assert(ioctl_fd >= 0); - - init_autofs_dev_ioctl(¶m); - param.ioctlfd = ioctl_fd; - param.timeout.timeout = sec; - - if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m) < 0) - return -errno; - - return 0; -} - -static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) { - struct autofs_dev_ioctl param; - - assert(dev_autofs_fd >= 0); - assert(ioctl_fd >= 0); - - init_autofs_dev_ioctl(¶m); - param.ioctlfd = ioctl_fd; - - if (status) { - param.fail.token = token; - param.fail.status = status; - } else - param.ready.token = token; - - if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m) < 0) - return -errno; - - return 0; -} - -int automount_send_ready(Automount *a, int status) { - int ioctl_fd, r; - unsigned token; - - assert(a); - assert(status <= 0); - - if (set_isempty(a->tokens)) - return 0; - - if ((ioctl_fd = open_ioctl_fd(UNIT(a)->meta.manager->dev_autofs_fd, a->where, a->dev_id)) < 0) { - r = ioctl_fd; - goto fail; - } - - if (status) - log_debug("Sending failure: %s", strerror(-status)); - else - log_debug("Sending success."); - - /* Autofs thankfully does not hand out 0 as a token */ - while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) { - int k; - - /* Autofs fun fact II: - * - * if you pass a positive status code here, the kernel will - * freeze! Yay! */ - - if ((k = autofs_send_ready(UNIT(a)->meta.manager->dev_autofs_fd, - ioctl_fd, - token, - status)) < 0) - r = k; - } - - r = 0; - -fail: - if (ioctl_fd >= 0) - close_nointr_nofail(ioctl_fd); - - return r; -} - -static void automount_enter_waiting(Automount *a) { - int p[2] = { -1, -1 }; - char name[32], options[128]; - bool mounted = false; - int r, ioctl_fd = -1, dev_autofs_fd; - struct stat st; - - assert(a); - assert(a->pipe_fd < 0); - assert(a->where); - - if (a->tokens) - set_clear(a->tokens); - - if ((dev_autofs_fd = open_dev_autofs(UNIT(a)->meta.manager)) < 0) { - r = dev_autofs_fd; - goto fail; - } - - /* We knowingly ignore the results of this call */ - mkdir_p(a->where, 0555); - - if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) { - r = -errno; - goto fail; - } - - snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp()); - char_array_0(options); - - snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid()); - char_array_0(name); - - if (mount(name, a->where, "autofs", 0, options) < 0) { - r = -errno; - goto fail; - } - - mounted = true; - - close_nointr_nofail(p[1]); - p[1] = -1; - - if (stat(a->where, &st) < 0) { - r = -errno; - goto fail; - } - - if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) { - r = ioctl_fd; - goto fail; - } - - if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0) - goto fail; - - if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0) - goto fail; - - /* Autofs fun fact: - * - * Unless we close the ioctl fd here, for some weird reason - * the direct mount will not receive events from the - * kernel. */ - - close_nointr_nofail(ioctl_fd); - ioctl_fd = -1; - - if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0) - goto fail; - - a->pipe_fd = p[0]; - a->dev_id = st.st_dev; - - automount_set_state(a, AUTOMOUNT_WAITING); - - return; - -fail: - assert_se(close_pipe(p) == 0); - - if (ioctl_fd >= 0) - close_nointr_nofail(ioctl_fd); - - if (mounted) - repeat_unmout(a->where); - - log_error("Failed to initialize automounter: %s", strerror(-r)); - automount_enter_dead(a, false); -} - -static void automount_enter_runnning(Automount *a) { - int r; - struct stat st; - - assert(a); - assert(a->mount); - - /* Before we do anything, let's see if somebody is playing games with us? */ - - if (stat(a->where, &st) < 0) { - log_warning("%s failed stat automount point: %m", a->meta.id); - goto fail; - } - - if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) - log_info("%s's automount point already active?", a->meta.id); - else if ((r = manager_add_job(UNIT(a)->meta.manager, JOB_START, UNIT(a->mount), JOB_REPLACE, true, NULL)) < 0) { - log_warning("%s failed to queue mount startup job: %s", a->meta.id, strerror(-r)); - goto fail; - } - - automount_set_state(a, AUTOMOUNT_RUNNING); - return; - -fail: - automount_enter_dead(a, false); -} - -static int automount_start(Unit *u) { - Automount *a = AUTOMOUNT(u); - - assert(a); - - if (path_is_mount_point(a->where)) { - log_error("Path %s is already a mount point, refusing start for %s", a->where, u->meta.id); - return -EEXIST; - } - - assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_MAINTAINANCE); - - a->failure = false; - automount_enter_waiting(a); - return 0; -} - -static int automount_stop(Unit *u) { - Automount *a = AUTOMOUNT(u); - - assert(a); - - assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING); - - automount_enter_dead(a, true); - return 0; -} - -static int automount_serialize(Unit *u, FILE *f, FDSet *fds) { - Automount *a = AUTOMOUNT(u); - void *p; - Iterator i; - - assert(a); - assert(f); - assert(fds); - - unit_serialize_item(u, f, "state", automount_state_to_string(a->state)); - unit_serialize_item(u, f, "failure", yes_no(a->failure)); - unit_serialize_item_format(u, f, "dev-id", "%u", (unsigned) a->dev_id); - - SET_FOREACH(p, a->tokens, i) - unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p)); - - if (a->pipe_fd >= 0) { - int copy; - - if ((copy = fdset_put_dup(fds, a->pipe_fd)) < 0) - return copy; - - unit_serialize_item_format(u, f, "pipe-fd", "%i", copy); - } - - return 0; -} - -static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { - Automount *a = AUTOMOUNT(u); - int r; - - assert(a); - assert(fds); - - if (streq(key, "state")) { - AutomountState state; - - if ((state = automount_state_from_string(value)) < 0) - log_debug("Failed to parse state value %s", value); - else - a->deserialized_state = state; - } else if (streq(key, "failure")) { - int b; - - if ((b = parse_boolean(value)) < 0) - log_debug("Failed to parse failure value %s", value); - else - a->failure = b || a->failure; - } else if (streq(key, "dev-id")) { - unsigned d; - - if (safe_atou(value, &d) < 0) - log_debug("Failed to parse dev-id value %s", value); - else - a->dev_id = (unsigned) d; - } else if (streq(key, "token")) { - unsigned token; - - if (safe_atou(value, &token) < 0) - log_debug("Failed to parse token value %s", value); - else { - if (!a->tokens) - if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) - return -ENOMEM; - - if ((r = set_put(a->tokens, UINT_TO_PTR(token))) < 0) - return r; - } - } else if (streq(key, "pipe-fd")) { - int fd; - - if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) - log_debug("Failed to parse pipe-fd value %s", value); - else { - if (a->pipe_fd >= 0) - close_nointr_nofail(a->pipe_fd); - - a->pipe_fd = fdset_remove(fds, fd); - } - } else - log_debug("Unknown serialization key '%s'", key); - - return 0; -} - -static UnitActiveState automount_active_state(Unit *u) { - assert(u); - - return state_translation_table[AUTOMOUNT(u)->state]; -} - -static const char *automount_sub_state_to_string(Unit *u) { - assert(u); - - return automount_state_to_string(AUTOMOUNT(u)->state); -} - -static bool automount_check_gc(Unit *u) { - Automount *a = AUTOMOUNT(u); - - assert(a); - - return UNIT_VTABLE(UNIT(a->mount))->check_gc(UNIT(a->mount)); -} - -static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { - Automount *a = AUTOMOUNT(u); - union autofs_v5_packet_union packet; - ssize_t l; - int r; - - assert(a); - assert(fd == a->pipe_fd); - - if (events != EPOLLIN) { - log_error("Got invalid poll event on pipe."); - goto fail; - } - - if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet))) != sizeof(packet)) { - log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read"); - goto fail; - } - - switch (packet.hdr.type) { - - case autofs_ptype_missing_direct: - log_debug("Got direct mount request for %s", packet.v5_packet.name); - - if (!a->tokens) - if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) { - log_error("Failed to allocate token set."); - goto fail; - } - - 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); -} - -static const char* const automount_state_table[_AUTOMOUNT_STATE_MAX] = { - [AUTOMOUNT_DEAD] = "dead", - [AUTOMOUNT_WAITING] = "waiting", - [AUTOMOUNT_RUNNING] = "running", - [AUTOMOUNT_MAINTAINANCE] = "maintainance" -}; - -DEFINE_STRING_TABLE_LOOKUP(automount_state, AutomountState); - -const UnitVTable automount_vtable = { - .suffix = ".automount", - - .no_alias = true, - .no_instances = true, - - .init = automount_init, - .load = automount_load, - .done = automount_done, - - .coldplug = automount_coldplug, - - .dump = automount_dump, - - .start = automount_start, - .stop = automount_stop, - - .serialize = automount_serialize, - .deserialize_item = automount_deserialize_item, - - .active_state = automount_active_state, - .sub_state_to_string = automount_sub_state_to_string, - - .check_gc = automount_check_gc, - - .fd_event = automount_fd_event, - - .bus_message_handler = bus_automount_message_handler, - - .shutdown = automount_shutdown -}; |