416 lines
10 KiB
C
416 lines
10 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#include <errno.h>
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#include <stdio.h>
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#include <mntent.h>
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#include "unit.h"
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#include "mount.h"
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#include "load-fragment.h"
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#include "load-dropin.h"
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#include "log.h"
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static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
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[MOUNT_DEAD] = UNIT_INACTIVE,
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[MOUNT_MOUNTING] = UNIT_ACTIVATING,
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[MOUNT_MOUNTED] = UNIT_ACTIVE,
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[MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
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[MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
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};
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static const char* const state_string_table[_MOUNT_STATE_MAX] = {
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[MOUNT_DEAD] = "dead",
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[MOUNT_MOUNTING] = "mounting",
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[MOUNT_MOUNTED] = "mounted",
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[MOUNT_UNMOUNTING] = "unmounting",
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[MOUNT_MAINTAINANCE] = "maintainance"
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};
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static void mount_done(Unit *u) {
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Mount *d = MOUNT(u);
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assert(d);
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free(d->what);
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free(d->where);
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}
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static void mount_set_state(Mount *m, MountState state) {
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MountState old_state;
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assert(m);
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old_state = m->state;
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m->state = state;
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log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
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unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
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}
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static int mount_coldplug(Unit *u) {
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Mount *m = MOUNT(u);
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assert(m);
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assert(m->state == MOUNT_DEAD);
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if (m->from_proc_self_mountinfo)
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mount_set_state(m, MOUNT_MOUNTED);
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return 0;
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}
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static void mount_dump(Unit *u, FILE *f, const char *prefix) {
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Mount *s = MOUNT(u);
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assert(s);
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fprintf(f,
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"%sMount State: %s\n"
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"%sWhere: %s\n"
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"%sWhat: %s\n"
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"%sFrom /etc/fstab: %s\n"
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"%sFrom /proc/self/mountinfo: %s\n",
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prefix, state_string_table[s->state],
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prefix, s->where,
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prefix, s->what,
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prefix, yes_no(s->from_etc_fstab),
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prefix, yes_no(s->from_proc_self_mountinfo));
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}
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static UnitActiveState mount_active_state(Unit *u) {
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assert(u);
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return state_translation_table[MOUNT(u)->state];
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}
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static void mount_shutdown(Manager *m) {
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}
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static int mount_add_node_links(Mount *m) {
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Unit *device;
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char *e;
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int r;
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assert(m);
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/* Adds in links to the device that this node is based on */
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if (!path_startswith(m->what, "/dev/"))
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return 0;
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if (!(e = unit_name_escape_path("node-", m->what+1, ".device")))
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return -ENOMEM;
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r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
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free(e);
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if (r < 0)
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return r;
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if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
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return r;
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if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
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return r;
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if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
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return r;
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return 0;
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}
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static int mount_add_path_links(Mount *m) {
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Iterator i;
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Unit *other;
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int r;
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/* Adds in link to other mount points, that might lie below or
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* above us in the hierarchy */
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HASHMAP_FOREACH(other, UNIT(m)->meta.manager->units, i) {
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Mount *n;
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if (other->meta.type != UNIT_MOUNT)
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continue;
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n = MOUNT(other);
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if (path_startswith(m->where, n->where)) {
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if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, other)) < 0)
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return r;
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if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, other)) < 0)
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return r;
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} else if (startswith(n->where, m->where)) {
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if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, other)) < 0)
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return r;
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if ((r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m))) < 0)
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return r;
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}
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}
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return 0;
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}
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static int mount_add_one(Manager *m, const char *what, const char *where, bool live) {
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char *e;
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int r;
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Unit *u;
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bool delete;
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assert(m);
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assert(what);
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assert(where);
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/* probably some kind of swap, which we don't cover for now */
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if (where[0] != '/')
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return 0;
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if (streq(where, "/"))
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e = strdup("rootfs.mount");
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else
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e = unit_name_escape_path("fs-", where+1, ".mount");
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if (!e)
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return -ENOMEM;
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if (!(u = manager_get_unit(m, e))) {
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delete = true;
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if (!(u = unit_new(m))) {
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free(e);
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return -ENOMEM;
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}
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r = unit_add_name(u, e);
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free(e);
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if (r < 0)
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goto fail;
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if (!(MOUNT(u)->what = strdup(what)) ||
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!(MOUNT(u)->where = strdup(where))) {
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r = -ENOMEM;
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goto fail;
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}
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if ((r = unit_set_description(u, where)) < 0)
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goto fail;
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} else {
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delete = false;
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free(e);
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}
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if (live)
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MOUNT(u)->from_proc_self_mountinfo = true;
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else
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MOUNT(u)->from_etc_fstab = true;
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if ((r = mount_add_node_links(MOUNT(u))) < 0)
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goto fail;
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if ((r = mount_add_path_links(MOUNT(u))) < 0)
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goto fail;
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unit_add_to_load_queue(u);
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return 0;
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fail:
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if (delete && u)
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unit_free(u);
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return 0;
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}
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static char *fstab_node_to_udev_node(char *p) {
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char *dn, *t;
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int r;
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/* FIXME: to follow udev's logic 100% we need to leave valid
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* UTF8 chars unescaped */
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if (startswith(p, "LABEL=")) {
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if (!(t = xescape(p+6, "/ ")))
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return NULL;
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r = asprintf(&dn, "/dev/disk/by-label/%s", t);
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free(t);
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if (r < 0)
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return NULL;
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return dn;
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}
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if (startswith(p, "UUID=")) {
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if (!(t = xescape(p+5, "/ ")))
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return NULL;
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r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
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free(t);
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if (r < 0)
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return NULL;
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return dn;
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}
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return strdup(p);
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}
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static int mount_load_etc_fstab(Manager *m) {
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FILE *f;
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int r;
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struct mntent* me;
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assert(m);
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errno = 0;
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if (!(f = setmntent("/etc/fstab", "r")))
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return -errno;
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while ((me = getmntent(f))) {
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char *where, *what;
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if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
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r = -ENOMEM;
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goto finish;
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}
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if (!(where = strdup(me->mnt_dir))) {
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free(what);
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r = -ENOMEM;
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goto finish;
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}
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if (what[0] == '/')
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path_kill_slashes(what);
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if (where[0] == '/')
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path_kill_slashes(where);
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r = mount_add_one(m, what, where, false);
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free(what);
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free(where);
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if (r < 0)
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goto finish;
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}
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r = 0;
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finish:
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endmntent(f);
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return r;
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}
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static int mount_load_proc_self_mountinfo(Manager *m) {
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FILE *f;
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int r;
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assert(m);
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if (!(f = fopen("/proc/self/mountinfo", "r")))
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return -errno;
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for (;;) {
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int k;
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char *device, *path, *d, *p;
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if ((k = fscanf(f,
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"%*s " /* (1) mount id */
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"%*s " /* (2) parent id */
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"%*s " /* (3) major:minor */
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"%*s " /* (4) root */
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"%ms " /* (5) mount point */
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"%*s" /* (6) mount options */
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"%*[^-]" /* (7) optional fields */
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"- " /* (8) seperator */
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"%*s " /* (9) file system type */
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"%ms" /* (10) mount source */
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"%*[^\n]", /* some rubbish at the end */
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&path,
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&device)) != 2) {
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if (k == EOF) {
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if (feof(f))
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break;
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r = -errno;
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goto finish;
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}
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r = -EBADMSG;
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goto finish;
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}
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if (!(d = cunescape(device))) {
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free(device);
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free(path);
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r = -ENOMEM;
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goto finish;
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}
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free(device);
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if (!(p = cunescape(path))) {
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free(d);
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free(path);
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r = -ENOMEM;
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goto finish;
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}
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free(path);
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r = mount_add_one(m, d, p, true);
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free(d);
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free(p);
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if (r < 0)
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goto finish;
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}
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r = 0;
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finish:
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fclose(f);
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return r;
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}
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static int mount_enumerate(Manager *m) {
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int r;
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assert(m);
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if ((r = mount_load_etc_fstab(m)) < 0)
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goto fail;
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if ((r = mount_load_proc_self_mountinfo(m)) < 0)
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goto fail;
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return 0;
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fail:
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mount_shutdown(m);
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return r;
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}
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const UnitVTable mount_vtable = {
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.suffix = ".mount",
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.init = unit_load_fragment_and_dropin,
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.done = mount_done,
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.coldplug = mount_coldplug,
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.dump = mount_dump,
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.active_state = mount_active_state,
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.enumerate = mount_enumerate,
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.shutdown = mount_shutdown
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};
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