/* ----------------------------------------------------------------------- *
*
* direct.c - Linux automounter direct mount handling
*
* Copyright 1997 Transmeta Corporation - All Rights Reserved
* Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
* Copyright 2001-2005 Ian Kent <raven@themaw.net>
*
* This program 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, Inc., 675 Mass Ave, Cambridge MA 02139,
* USA; either version 2 of the License, or (at your option) any later
* version.
*
* This program 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.
*
* ----------------------------------------------------------------------- */
#include <dirent.h>
#include <libgen.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <sys/mount.h>
#include <sys/vfs.h>
#include <sched.h>
#define INCLUDE_PENDING_FUNCTIONS
#include "automount.h"
/* Attribute to create detached thread */
extern pthread_attr_t th_attr_detached;
struct mnt_params {
char *options;
};
pthread_key_t key_mnt_direct_params;
pthread_key_t key_mnt_offset_params;
pthread_once_t key_mnt_params_once = PTHREAD_ONCE_INIT;
static void key_mnt_params_destroy(void *arg)
{
struct mnt_params *mp;
mp = (struct mnt_params *) arg;
if (mp->options)
free(mp->options);
free(mp);
return;
}
static void key_mnt_params_init(void)
{
int status;
status = pthread_key_create(&key_mnt_direct_params, key_mnt_params_destroy);
if (status)
fatal(status);
status = pthread_key_create(&key_mnt_offset_params, key_mnt_params_destroy);
if (status)
fatal(status);
return;
}
static void mnts_cleanup(void *arg)
{
struct mnt_list *mnts = (struct mnt_list *) arg;
tree_free_mnt_tree(mnts);
return;
}
int do_umount_autofs_direct(struct autofs_point *ap, struct mapent *me)
{
struct ioctl_ops *ops = get_ioctl_ops();
char buf[MAX_ERR_BUF];
int ioctlfd = -1, rv, left, retries;
int opened = 0;
left = umount_multi(ap, me->key, 0);
if (left) {
warn(ap->logopt, "could not unmount %d dirs under %s",
left, me->key);
return 1;
}
if (me->ioctlfd != -1) {
if (ap->state == ST_READMAP &&
is_mounted(me->key, MNTS_REAL)) {
error(ap->logopt,
"attempt to umount busy direct mount %s",
me->key);
return 1;
}
ioctlfd = me->ioctlfd;
} else {
ops->open(ap->logopt, &ioctlfd, me->dev, me->key);
opened = 1;
}
if (ioctlfd >= 0) {
unsigned int status = 1;
rv = ops->askumount(ap->logopt, ioctlfd, &status);
if (rv) {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
error(ap->logopt, "ioctl failed: %s", estr);
/* The ioctl failed so this probably won't
* work either but since we opened it here
* try anyway. We should set these catatonic
* too but ....
*/
if (opened)
ops->close(ap->logopt, ioctlfd);
return 1;
} else if (!status) {
if (ap->state != ST_SHUTDOWN_FORCE) {
error(ap->logopt,
"ask umount returned busy for %s",
me->key);
if (opened)
ops->close(ap->logopt, ioctlfd);
return 1;
} else {
me->ioctlfd = -1;
ops->close(ap->logopt, ioctlfd);
goto force_umount;
}
}
me->ioctlfd = -1;
ops->close(ap->logopt, ioctlfd);
} else {
error(ap->logopt,
"couldn't get ioctl fd for direct mount %s", me->key);
return 1;
}
sched_yield();
retries = UMOUNT_RETRIES;
while ((rv = umount(me->key)) == -1 && retries--) {
struct timespec tm = {0, 200000000};
if (errno != EBUSY)
break;
nanosleep(&tm, NULL);
}
if (rv == -1) {
switch (errno) {
case ENOENT:
case EINVAL:
warn(ap->logopt, "mount point %s does not exist",
me->key);
return 0;
break;
case EBUSY:
warn(ap->logopt, "mount point %s is in use", me->key);
if (ap->state == ST_SHUTDOWN_FORCE)
goto force_umount;
else {
if (ap->state != ST_READMAP)
set_direct_mount_tree_catatonic(ap, me);
return 0;
}
break;
case ENOTDIR:
error(ap->logopt, "mount point is not a directory");
return 0;
break;
}
return 1;
}
force_umount:
if (rv != 0) {
info(ap->logopt, "forcing umount of direct mount %s", me->key);
rv = umount2(me->key, MNT_DETACH);
} else
info(ap->logopt, "umounted direct mount %s", me->key);
if (!rv && me->flags & MOUNT_FLAG_DIR_CREATED) {
if (rmdir(me->key) == -1) {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
warn(ap->logopt, "failed to remove dir %s: %s",
me->key, estr);
}
}
return rv;
}
int umount_autofs_direct(struct autofs_point *ap)
{
struct map_source *map;
struct mapent_cache *nc, *mc;
struct mapent *me, *ne;
nc = ap->entry->master->nc;
cache_readlock(nc);
pthread_cleanup_push(cache_lock_cleanup, nc);
map = ap->entry->maps;
while (map) {
mc = map->mc;
pthread_cleanup_push(cache_lock_cleanup, mc);
cache_readlock(mc);
me = cache_enumerate(mc, NULL);
while (me) {
int error;
ne = cache_lookup_distinct(nc, me->key);
if (ne && map->master_line > ne->age) {
me = cache_enumerate(mc, me);
continue;
}
/* The daemon is exiting so ...
* If we get a fail here we must make our
* best effort to set the direct mount trigger
* catatonic regardless of the reason for the
* failed umount.
*/
error = do_umount_autofs_direct(ap, me);
if (!error)
goto done;
if (ap->state != ST_READMAP)
set_direct_mount_tree_catatonic(ap, me);
done:
me = cache_enumerate(mc, me);
}
pthread_cleanup_pop(1);
map = map->next;
}
pthread_cleanup_pop(1);
close(ap->state_pipe[0]);
close(ap->state_pipe[1]);
if (ap->pipefd >= 0)
close(ap->pipefd);
if (ap->kpipefd >= 0) {
close(ap->kpipefd);
ap->kpipefd = -1;
}
return 0;
}
int do_mount_autofs_direct(struct autofs_point *ap,
struct mapent *me, time_t timeout)
{
const char *str_direct = mount_type_str(t_direct);
struct ioctl_ops *ops = get_ioctl_ops();
struct mnt_params *mp;
struct stat st;
int status, ret, ioctlfd;
const char *map_name;
time_t runfreq;
int err;
if (timeout) {
/* Calculate the expire run frequency */
runfreq = (timeout + CHECK_RATIO - 1) / CHECK_RATIO;
if (ap->exp_runfreq)
ap->exp_runfreq = min(ap->exp_runfreq, runfreq);
else
ap->exp_runfreq = runfreq;
}
if (ops->version && !do_force_unlink) {
ap->flags |= MOUNT_FLAG_REMOUNT;
ret = try_remount(ap, me, t_direct);
ap->flags &= ~MOUNT_FLAG_REMOUNT;
if (ret == 1)
return 0;
if (ret == 0)
return -1;
} else {
if (ap->state == ST_READMAP && is_mounted(me->key, MNTS_ALL)) {
time_t tout = get_exp_timeout(ap, me->source);
int save_ioctlfd, ioctlfd;
save_ioctlfd = ioctlfd = me->ioctlfd;
if (ioctlfd == -1)
ops->open(ap->logopt,
&ioctlfd, me->dev, me->key);
if (ioctlfd < 0) {
error(ap->logopt,
"failed to create ioctl fd for %s",
me->key);
return 0;
}
ops->timeout(ap->logopt, ioctlfd, tout);
if (save_ioctlfd == -1)
ops->close(ap->logopt, ioctlfd);
return 0;
}
ret = unlink_mount_tree(ap, ap->path);
if (!ret) {
error(ap->logopt,
"already mounted as other than autofs "
"or failed to unlink entry in tree");
goto out_err;
}
if (me->ioctlfd != -1) {
error(ap->logopt, "active direct mount %s", me->key);
return -1;
}
}
status = pthread_once(&key_mnt_params_once, key_mnt_params_init);
if (status)
fatal(status);
mp = pthread_getspecific(key_mnt_direct_params);
if (!mp) {
mp = (struct mnt_params *) malloc(sizeof(struct mnt_params));
if (!mp) {
crit(ap->logopt,
"mnt_params value create failed for direct mount %s",
ap->path);
return 0;
}
mp->options = NULL;
status = pthread_setspecific(key_mnt_direct_params, mp);
if (status) {
free(mp);
fatal(status);
}
}
if (!mp->options) {
mp->options = make_options_string(ap->path,
ap->kpipefd, str_direct, ap->flags);
if (!mp->options)
return 0;
}
/* In case the directory doesn't exist, try to mkdir it */
if (mkdir_path(me->key, mp_mode) < 0) {
if (errno != EEXIST && errno != EROFS) {
crit(ap->logopt,
"failed to create mount directory %s", me->key);
return -1;
}
/* If we recieve an error, and it's EEXIST or EROFS we know
the directory was not created. */
me->flags &= ~MOUNT_FLAG_DIR_CREATED;
} else {
/* No errors so the directory was successfully created */
me->flags |= MOUNT_FLAG_DIR_CREATED;
}
map_name = me->mc->map->argv[0];
ret = mount(map_name, me->key, "autofs", MS_MGC_VAL, mp->options);
if (ret) {
crit(ap->logopt, "failed to mount autofs path %s", me->key);
goto out_err;
}
ret = stat(me->key, &st);
if (ret == -1) {
error(ap->logopt,
"failed to stat direct mount trigger %s", me->key);
goto out_umount;
}
if (ap->mode && (err = chmod(me->key, ap->mode)))
warn(ap->logopt, "failed to change mode of %s", me->key);
ops->open(ap->logopt, &ioctlfd, st.st_dev, me->key);
if (ioctlfd < 0) {
crit(ap->logopt, "failed to create ioctl fd for %s", me->key);
goto out_umount;
}
ops->timeout(ap->logopt, ioctlfd, timeout);
notify_mount_result(ap, me->key, timeout, str_direct);
cache_set_ino_index(me->mc, me->key, st.st_dev, st.st_ino);
ops->close(ap->logopt, ioctlfd);
debug(ap->logopt, "mounted trigger %s", me->key);
return 0;
out_umount:
/* TODO: maybe force umount (-l) */
umount(me->key);
out_err:
if (me->flags & MOUNT_FLAG_DIR_CREATED)
rmdir(me->key);
return -1;
}
int mount_autofs_direct(struct autofs_point *ap)
{
struct map_source *map;
struct mapent_cache *nc, *mc;
struct mapent *me, *ne, *nested;
time_t now = monotonic_time(NULL);
if (strcmp(ap->path, "/-")) {
error(ap->logopt, "expected direct map, exiting");
return -1;
}
/* TODO: check map type */
if (lookup_nss_read_map(ap, NULL, now))
lookup_prune_cache(ap, now);
else {
error(ap->logopt, "failed to read direct map");
return -1;
}
pthread_cleanup_push(master_source_lock_cleanup, ap->entry);
master_source_readlock(ap->entry);
nc = ap->entry->master->nc;
cache_readlock(nc);
pthread_cleanup_push(cache_lock_cleanup, nc);
map = ap->entry->maps;
while (map) {
time_t timeout;
/*
* Only consider map sources that have been read since
* the map entry was last updated.
*/
if (ap->entry->age > map->age) {
map = map->next;
continue;
}
mc = map->mc;
timeout = get_exp_timeout(ap, map);
cache_readlock(mc);
pthread_cleanup_push(cache_lock_cleanup, mc);
me = cache_enumerate(mc, NULL);
while (me) {
ne = cache_lookup_distinct(nc, me->key);
if (ne) {
if (map->master_line < ne->age) {
/* TODO: check return, locking me */
do_mount_autofs_direct(ap, me, timeout);
}
me = cache_enumerate(mc, me);
continue;
}
nested = cache_partial_match(nc, me->key);
if (nested) {
error(ap->logopt,
"removing invalid nested null entry %s",
nested->key);
nested = cache_partial_match(nc, me->key);
if (nested)
cache_delete(nc, nested->key);
}
/* TODO: check return, locking me */
do_mount_autofs_direct(ap, me, timeout);
me = cache_enumerate(mc, me);
}
pthread_cleanup_pop(1);
map = map->next;
}
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
return 0;
}
int umount_autofs_offset(struct autofs_point *ap, struct mapent *me)
{
struct ioctl_ops *ops = get_ioctl_ops();
char buf[MAX_ERR_BUF];
int ioctlfd = -1, rv = 1, retries;
int opened = 0;
if (me->ioctlfd != -1) {
if (is_mounted(me->key, MNTS_REAL)) {
error(ap->logopt,
"attempt to umount busy offset %s", me->key);
return 1;
}
ioctlfd = me->ioctlfd;
} else {
/* offset isn't mounted, return success and try to recover */
if (!is_mounted(me->key, MNTS_AUTOFS)) {
debug(ap->logopt,
"offset %s not mounted",
me->key);
return 0;
}
ops->open(ap->logopt, &ioctlfd, me->dev, me->key);
opened = 1;
}
if (ioctlfd >= 0) {
unsigned int status = 1;
rv = ops->askumount(ap->logopt, ioctlfd, &status);
if (rv) {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
logerr("ioctl failed: %s", estr);
if (opened && ioctlfd != -1)
ops->close(ap->logopt, ioctlfd);
return 1;
} else if (!status) {
if (ap->state != ST_SHUTDOWN_FORCE) {
if (ap->shutdown)
error(ap->logopt,
"ask umount returned busy for %s",
me->key);
if (opened && ioctlfd != -1)
ops->close(ap->logopt, ioctlfd);
return 1;
} else {
me->ioctlfd = -1;
ops->catatonic(ap->logopt, ioctlfd);
ops->close(ap->logopt, ioctlfd);
goto force_umount;
}
}
me->ioctlfd = -1;
ops->catatonic(ap->logopt, ioctlfd);
ops->close(ap->logopt, ioctlfd);
} else {
struct stat st;
char *estr;
int save_errno = errno;
/* Non existent directory on remote fs - no mount */
if (stat(me->key, &st) == -1 && errno == ENOENT)
return 0;
estr = strerror_r(save_errno, buf, MAX_ERR_BUF);
error(ap->logopt,
"couldn't get ioctl fd for offset %s: %s",
me->key, estr);
goto force_umount;
}
sched_yield();
retries = UMOUNT_RETRIES;
while ((rv = umount(me->key)) == -1 && retries--) {
struct timespec tm = {0, 200000000};
if (errno != EBUSY)
break;
nanosleep(&tm, NULL);
}
if (rv == -1) {
switch (errno) {
case ENOENT:
warn(ap->logopt, "mount point does not exist");
return 0;
break;
case EBUSY:
error(ap->logopt, "mount point %s is in use", me->key);
if (ap->state != ST_SHUTDOWN_FORCE)
return 1;
break;
case ENOTDIR:
error(ap->logopt, "mount point is not a directory");
return 0;
break;
}
goto force_umount;
}
force_umount:
if (rv != 0) {
info(ap->logopt, "forcing umount of offset mount %s", me->key);
rv = umount2(me->key, MNT_DETACH);
} else
info(ap->logopt, "umounted offset mount %s", me->key);
return rv;
}
int mount_autofs_offset(struct autofs_point *ap, struct mapent *me, const char *root, const char *offset)
{
const char *str_offset = mount_type_str(t_offset);
struct ioctl_ops *ops = get_ioctl_ops();
char buf[MAX_ERR_BUF];
struct mnt_params *mp;
time_t timeout = get_exp_timeout(ap, me->source);
struct stat st;
int ioctlfd, status, ret;
const char *hosts_map_name = "-hosts";
const char *map_name = hosts_map_name;
const char *type;
char mountpoint[PATH_MAX];
if (ops->version && ap->flags & MOUNT_FLAG_REMOUNT) {
ret = try_remount(ap, me, t_offset);
if (ret == 1)
return MOUNT_OFFSET_OK;
/* Offset mount not found, fall thru and try to mount it */
if (!(ret == -1 && errno == ENOENT))
return MOUNT_OFFSET_FAIL;
} else {
if (is_mounted(me->key, MNTS_AUTOFS)) {
if (ap->state != ST_READMAP)
warn(ap->logopt,
"trigger %s already mounted", me->key);
return MOUNT_OFFSET_OK;
}
if (me->ioctlfd != -1) {
error(ap->logopt, "active offset mount %s", me->key);
return MOUNT_OFFSET_FAIL;
}
}
status = pthread_once(&key_mnt_params_once, key_mnt_params_init);
if (status)
fatal(status);
mp = pthread_getspecific(key_mnt_offset_params);
if (!mp) {
mp = (struct mnt_params *) malloc(sizeof(struct mnt_params));
if (!mp) {
crit(ap->logopt,
"mnt_params value create failed for offset mount %s",
me->key);
return MOUNT_OFFSET_OK;
}
mp->options = NULL;
status = pthread_setspecific(key_mnt_offset_params, mp);
if (status) {
free(mp);
fatal(status);
}
}
if (!mp->options) {
mp->options = make_options_string(ap->path,
ap->kpipefd, str_offset, ap->flags);
if (!mp->options)
return MOUNT_OFFSET_OK;
}
strcpy(mountpoint, root);
strcat(mountpoint, offset);
/* In case the directory doesn't exist, try to mkdir it */
if (mkdir_path(mountpoint, mp_mode) < 0) {
if (errno == EEXIST) {
/*
* If the mount point directory is a real mount
* and it isn't the root offset then it must be
* a mount that has been automatically mounted by
* the kernel NFS client.
*/
if (me->multi != me &&
is_mounted(mountpoint, MNTS_REAL))
return MOUNT_OFFSET_IGNORE;
/*
* If we recieve an error, and it's EEXIST
* we know the directory was not created.
*/
me->flags &= ~MOUNT_FLAG_DIR_CREATED;
} else if (errno == EACCES) {
/*
* We require the mount point directory to exist when
* installing multi-mount triggers into a host
* filesystem.
*
* If it doesn't exist it is not a valid part of the
* mount heirachy.
*/
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
debug(ap->logopt,
"can't create mount directory: %s, %s",
mountpoint, estr);
return MOUNT_OFFSET_FAIL;
} else {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
crit(ap->logopt,
"failed to create mount directory: %s, %s",
mountpoint, estr);
return MOUNT_OFFSET_FAIL;
}
} else {
/* No errors so the directory was successfully created */
me->flags |= MOUNT_FLAG_DIR_CREATED;
}
debug(ap->logopt,
"calling mount -t autofs " SLOPPY " -o %s automount %s",
mp->options, mountpoint);
type = ap->entry->maps->type;
if (!type || strcmp(ap->entry->maps->type, "hosts"))
map_name = me->mc->map->argv[0];
ret = mount(map_name, mountpoint, "autofs", MS_MGC_VAL, mp->options);
if (ret) {
crit(ap->logopt,
"failed to mount offset trigger %s at %s",
me->key, mountpoint);
goto out_err;
}
ret = stat(mountpoint, &st);
if (ret == -1) {
error(ap->logopt,
"failed to stat direct mount trigger %s", mountpoint);
goto out_umount;
}
ops->open(ap->logopt, &ioctlfd, st.st_dev, mountpoint);
if (ioctlfd < 0) {
crit(ap->logopt, "failed to create ioctl fd for %s", mountpoint);
goto out_umount;
}
ops->timeout(ap->logopt, ioctlfd, timeout);
cache_set_ino_index(me->mc, me->key, st.st_dev, st.st_ino);
if (ap->logopt & LOGOPT_DEBUG)
notify_mount_result(ap, mountpoint, timeout, str_offset);
else
notify_mount_result(ap, me->key, timeout, str_offset);
ops->close(ap->logopt, ioctlfd);
debug(ap->logopt, "mounted trigger %s at %s", me->key, mountpoint);
return MOUNT_OFFSET_OK;
out_umount:
umount(mountpoint);
out_err:
if (stat(mountpoint, &st) == 0 && me->flags & MOUNT_FLAG_DIR_CREATED)
rmdir_path(ap, mountpoint, st.st_dev);
return MOUNT_OFFSET_FAIL;
}
void *expire_proc_direct(void *arg)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct mnt_list *mnts = NULL, *next;
struct list_head list, *p;
struct expire_args *ea;
struct expire_args ec;
struct autofs_point *ap;
struct mapent *me = NULL;
unsigned int how;
int ioctlfd, cur_state;
int status, ret, left;
ea = (struct expire_args *) arg;
status = pthread_mutex_lock(&ea->mutex);
if (status)
fatal(status);
ap = ec.ap = ea->ap;
how = ea->how;
ec.status = -1;
ea->signaled = 1;
status = pthread_cond_signal(&ea->cond);
if (status)
fatal(status);
status = pthread_mutex_unlock(&ea->mutex);
if (status)
fatal(status);
pthread_cleanup_push(expire_cleanup, &ec);
left = 0;
mnts = tree_make_mnt_tree("/");
pthread_cleanup_push(mnts_cleanup, mnts);
/* Get a list of mounts select real ones and expire them if possible */
INIT_LIST_HEAD(&list);
if (!tree_get_mnt_list(mnts, &list, "/", 0)) {
ec.status = 0;
return NULL;
}
list_for_each(p, &list) {
next = list_entry(p, struct mnt_list, list);
/*
* All direct mounts must be present in the map
* entry cache.
*/
pthread_cleanup_push(master_source_lock_cleanup, ap->entry);
master_source_readlock(ap->entry);
me = lookup_source_mapent(ap, next->mp, LKP_DISTINCT);
pthread_cleanup_pop(1);
if (!me)
continue;
if (next->flags & MNTS_AUTOFS) {
struct stat st;
int ioctlfd;
cache_unlock(me->mc);
/*
* If we have submounts check if this path lives below
* one of them and pass on state change.
*/
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cur_state);
if (next->flags & MNTS_INDIRECT) {
master_notify_submount(ap, next->mp, ap->state);
pthread_setcancelstate(cur_state, NULL);
continue;
}
if (me->ioctlfd == -1) {
pthread_setcancelstate(cur_state, NULL);
continue;
}
/* It's got a mount, deal with in the outer loop */
if (is_mounted(me->key, MNTS_REAL)) {
pthread_setcancelstate(cur_state, NULL);
continue;
}
/*
* Maybe a manual umount, repair.
* It will take ap->exp_timeout/4 for us to relaize
* this so user must still use USR1 signal to close
* the open file handle for mounts atop multi-mount
* triggers. There is no way that I'm aware of to
* avoid maintaining a file handle for control
* functions as once it's mounted all opens are
* directed to the mount not the trigger.
*/
/* Check for manual umount */
cache_writelock(me->mc);
if (me->ioctlfd != -1 &&
fstat(me->ioctlfd, &st) != -1 &&
!count_mounts(ap, next->mp, st.st_dev)) {
ops->close(ap->logopt, me->ioctlfd);
me->ioctlfd = -1;
cache_unlock(me->mc);
pthread_setcancelstate(cur_state, NULL);
continue;
}
cache_unlock(me->mc);
ioctlfd = me->ioctlfd;
ret = ops->expire(ap->logopt, ioctlfd, next->mp, how);
if (ret) {
left++;
pthread_setcancelstate(cur_state, NULL);
continue;
}
pthread_setcancelstate(cur_state, NULL);
continue;
}
if (me->ioctlfd >= 0) {
/* Real mounts have an open ioctl fd */
ioctlfd = me->ioctlfd;
cache_unlock(me->mc);
} else {
cache_unlock(me->mc);
continue;
}
if (ap->state == ST_EXPIRE || ap->state == ST_PRUNE)
pthread_testcancel();
debug(ap->logopt, "send expire to trigger %s", next->mp);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cur_state);
ret = ops->expire(ap->logopt, ioctlfd, next->mp, how);
if (ret)
left++;
pthread_setcancelstate(cur_state, NULL);
}
pthread_cleanup_pop(1);
if (left)
debug(ap->logopt, "%d remaining in %s", left, ap->path);
ec.status = left;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cur_state);
pthread_cleanup_pop(1);
pthread_setcancelstate(cur_state, NULL);
return NULL;
}
static void expire_send_fail(void *arg)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct pending_args *mt = arg;
struct autofs_point *ap = mt->ap;
ops->send_fail(ap->logopt,
mt->ioctlfd, mt->wait_queue_token, -ENOENT);
}
static void *do_expire_direct(void *arg)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct pending_args *args, mt;
struct autofs_point *ap;
size_t len;
int status, state;
args = (struct pending_args *) arg;
pending_mutex_lock(args);
memcpy(&mt, args, sizeof(struct pending_args));
ap = mt.ap;
args->signaled = 1;
status = pthread_cond_signal(&args->cond);
if (status)
fatal(status);
pending_mutex_unlock(args);
pthread_cleanup_push(expire_send_fail, &mt);
len = _strlen(mt.name, KEY_MAX_LEN);
if (!len) {
warn(ap->logopt, "direct key path too long %s", mt.name);
/* TODO: force umount ?? */
pthread_exit(NULL);
}
status = do_expire(ap, mt.name, len);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
if (status)
ops->send_fail(ap->logopt,
mt.ioctlfd, mt.wait_queue_token, -ENOENT);
else {
struct mapent *me;
cache_writelock(mt.mc);
me = cache_lookup_distinct(mt.mc, mt.name);
if (me)
me->ioctlfd = -1;
cache_unlock(mt.mc);
ops->send_ready(ap->logopt, mt.ioctlfd, mt.wait_queue_token);
ops->close(ap->logopt, mt.ioctlfd);
}
pthread_setcancelstate(state, NULL);
pthread_cleanup_pop(0);
return NULL;
}
int handle_packet_expire_direct(struct autofs_point *ap, autofs_packet_expire_direct_t *pkt)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct map_source *map;
struct mapent_cache *mc = NULL;
struct mapent *me = NULL;
struct pending_args *mt;
char buf[MAX_ERR_BUF];
pthread_t thid;
struct timespec wait;
int status, state;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
/*
* This is a bit of a big deal.
* If we can't find the path and the map entry then
* we can't send a notification back to the kernel.
* Hang results.
*
* OTOH there is a mount so there should be a path
* and since it got mounted we have to trust that
* there is an entry in the cache.
*/
master_source_writelock(ap->entry);
map = ap->entry->maps;
while (map) {
mc = map->mc;
cache_writelock(mc);
me = cache_lookup_ino(mc, pkt->dev, pkt->ino);
if (me)
break;
cache_unlock(mc);
map = map->next;
}
if (!me) {
/*
* Shouldn't happen as we have been sent this following
* successful thread creation and lookup.
*/
crit(ap->logopt, "can't find map entry for (%lu,%lu)",
(unsigned long) pkt->dev, (unsigned long) pkt->ino);
master_source_unlock(ap->entry);
pthread_setcancelstate(state, NULL);
return 1;
}
/* Can't expire it if it isn't mounted */
if (me->ioctlfd == -1) {
int ioctlfd;
ops->open(ap->logopt, &ioctlfd, me->dev, me->key);
if (ioctlfd == -1) {
crit(ap->logopt, "can't open ioctlfd for %s", me->key);
cache_unlock(mc);
master_source_unlock(ap->entry);
pthread_setcancelstate(state, NULL);
return 1;
}
ops->send_ready(ap->logopt, ioctlfd, pkt->wait_queue_token);
ops->close(ap->logopt, ioctlfd);
cache_unlock(mc);
master_source_unlock(ap->entry);
pthread_setcancelstate(state, NULL);
return 0;
}
mt = malloc(sizeof(struct pending_args));
if (!mt) {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
error(ap->logopt, "malloc: %s", estr);
ops->send_fail(ap->logopt,
me->ioctlfd, pkt->wait_queue_token, -ENOMEM);
cache_unlock(mc);
master_source_unlock(ap->entry);
pthread_setcancelstate(state, NULL);
return 1;
}
pending_cond_init(mt);
status = pthread_mutex_init(&mt->mutex, NULL);
if (status)
fatal(status);
mt->ap = ap;
mt->ioctlfd = me->ioctlfd;
mt->mc = mc;
/* TODO: check length here */
strcpy(mt->name, me->key);
mt->dev = me->dev;
mt->type = NFY_EXPIRE;
mt->wait_queue_token = pkt->wait_queue_token;
debug(ap->logopt, "token %ld, name %s",
(unsigned long) pkt->wait_queue_token, mt->name);
pending_mutex_lock(mt);
status = pthread_create(&thid, &th_attr_detached, do_expire_direct, mt);
if (status) {
error(ap->logopt, "expire thread create failed");
ops->send_fail(ap->logopt,
mt->ioctlfd, pkt->wait_queue_token, -status);
cache_unlock(mc);
master_source_unlock(ap->entry);
pending_mutex_unlock(mt);
pending_cond_destroy(mt);
pending_mutex_destroy(mt);
free_pending_args(mt);
pthread_setcancelstate(state, NULL);
return 1;
}
cache_unlock(mc);
master_source_unlock(ap->entry);
pthread_cleanup_push(free_pending_args, mt);
pthread_cleanup_push(pending_mutex_destroy, mt);
pthread_cleanup_push(pending_cond_destroy, mt);
pthread_cleanup_push(pending_mutex_unlock, mt);
pthread_setcancelstate(state, NULL);
mt->signaled = 0;
while (!mt->signaled) {
clock_gettime(CLOCK_MONOTONIC, &wait);
wait.tv_sec += 2;
status = pthread_cond_timedwait(&mt->cond, &mt->mutex, &wait);
if (status && status != ETIMEDOUT)
fatal(status);
}
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
return 0;
}
static void mount_send_fail(void *arg)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct pending_args *mt = arg;
struct autofs_point *ap = mt->ap;
ops->send_fail(ap->logopt, mt->ioctlfd, mt->wait_queue_token, -ENOENT);
ops->close(ap->logopt, mt->ioctlfd);
}
static void *do_mount_direct(void *arg)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct pending_args *args, mt;
struct autofs_point *ap;
struct stat st;
int status, state;
args = (struct pending_args *) arg;
pending_mutex_lock(args);
memcpy(&mt, args, sizeof(struct pending_args));
ap = mt.ap;
set_thread_mount_request_log_id(&mt);
args->signaled = 1;
status = pthread_cond_signal(&args->cond);
if (status)
fatal(status);
pending_mutex_unlock(args);
pthread_cleanup_push(mount_send_fail, &mt);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
if (defaults_get_mount_verbose()) {
pid_t ppid = log_pidinfo(ap, mt.pid, "requestor");
if (ppid > 0)
log_pidinfo(ap, ppid, "parent");
}
status = fstat(mt.ioctlfd, &st);
if (status == -1) {
error(ap->logopt,
"can't stat direct mount trigger %s", mt.name);
ops->send_fail(ap->logopt,
mt.ioctlfd, mt.wait_queue_token, -ENOENT);
ops->close(ap->logopt, mt.ioctlfd);
pthread_setcancelstate(state, NULL);
pthread_exit(NULL);
}
status = stat(mt.name, &st);
if (status != 0 || !S_ISDIR(st.st_mode) || st.st_dev != mt.dev) {
error(ap->logopt,
"direct trigger not valid or already mounted %s",
mt.name);
ops->send_ready(ap->logopt, mt.ioctlfd, mt.wait_queue_token);
ops->close(ap->logopt, mt.ioctlfd);
pthread_setcancelstate(state, NULL);
pthread_exit(NULL);
}
pthread_setcancelstate(state, NULL);
info(ap->logopt, "attempting to mount entry %s", mt.name);
set_tsd_user_vars(ap->logopt, mt.uid, mt.gid);
status = lookup_nss_mount(ap, NULL, mt.name, mt.len);
/*
* Direct mounts are always a single mount. If it fails there's
* nothing to undo so just complain
*/
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
if (status) {
struct mapent *me;
struct statfs fs;
unsigned int close_fd = 0;
if (statfs(mt.name, &fs) == -1 ||
(fs.f_type == AUTOFS_SUPER_MAGIC &&
!master_find_submount(ap, mt.name)))
close_fd = 1;
cache_writelock(mt.mc);
if ((me = cache_lookup_distinct(mt.mc, mt.name))) {
/*
* Careful here, we need to leave the file handle open
* for direct mount multi-mounts with no real mount at
* their base so they will be expired.
*/
if (close_fd && me == me->multi)
close_fd = 0;
if (!close_fd)
me->ioctlfd = mt.ioctlfd;
}
ops->send_ready(ap->logopt, mt.ioctlfd, mt.wait_queue_token);
cache_unlock(mt.mc);
if (close_fd)
ops->close(ap->logopt, mt.ioctlfd);
info(ap->logopt, "mounted %s", mt.name);
} else {
/* TODO: get mount return status from lookup_nss_mount */
ops->send_fail(ap->logopt,
mt.ioctlfd, mt.wait_queue_token, -ENOENT);
ops->close(ap->logopt, mt.ioctlfd);
info(ap->logopt, "failed to mount %s", mt.name);
}
pthread_setcancelstate(state, NULL);
pthread_cleanup_pop(0);
return NULL;
}
int handle_packet_missing_direct(struct autofs_point *ap, autofs_packet_missing_direct_t *pkt)
{
struct ioctl_ops *ops = get_ioctl_ops();
struct map_source *map;
struct mapent_cache *mc = NULL;
struct mapent *me = NULL;
pthread_t thid;
struct pending_args *mt;
char buf[MAX_ERR_BUF];
int status = 0;
struct timespec wait;
int ioctlfd, len, state;
unsigned int kver_major = get_kver_major();
unsigned int kver_minor = get_kver_minor();
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
master_mutex_lock();
/*
* If our parent is a direct or offset mount that has been
* covered by a mount and another lookup occurs after the
* mount but before the device and inode are set in the
* cache entry we will not be able to find the mapent. So
* we must take the source writelock to ensure the parent
* has mount is complete before we look for the entry.
*
* Since the vfs-automount kernel changes we can now block
* on covered mounts during mount tree construction so a
* write lock is no longer needed. So we now can handle a
* wider class of recursively define mount lookups.
*/
if (kver_major > 5 || (kver_major == 5 && kver_minor > 1))
master_source_readlock(ap->entry);
else
master_source_writelock(ap->entry);
map = ap->entry->maps;
while (map) {
/*
* Only consider map sources that have been read since
* the map entry was last updated.
*/
if (ap->entry->age > map->age) {
map = map->next;
continue;
}
mc = map->mc;
cache_readlock(mc);
me = cache_lookup_ino(mc, pkt->dev, pkt->ino);
if (me)
break;
cache_unlock(mc);
map = map->next;
}
if (!me) {
/*
* Shouldn't happen as the kernel is telling us
* someone has walked on our mount point.
*/
logerr("can't find map entry for (%lu,%lu)",
(unsigned long) pkt->dev, (unsigned long) pkt->ino);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_setcancelstate(state, NULL);
return 1;
}
if (me->ioctlfd != -1) {
/* Maybe someone did a manual umount, clean up ! */
close(me->ioctlfd);
me->ioctlfd = -1;
}
ops->open(ap->logopt, &ioctlfd, me->dev, me->key);
if (ioctlfd == -1) {
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_setcancelstate(state, NULL);
crit(ap->logopt, "failed to create ioctl fd for %s", me->key);
/* TODO: how do we clear wait q in kernel ?? */
return 1;
}
debug(ap->logopt, "token %ld, name %s, request pid %u",
(unsigned long) pkt->wait_queue_token, me->key, pkt->pid);
/* Ignore packet if we're trying to shut down */
if (ap->shutdown || ap->state == ST_SHUTDOWN_FORCE) {
ops->send_fail(ap->logopt,
ioctlfd, pkt->wait_queue_token, -ENOENT);
ops->close(ap->logopt, ioctlfd);
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_setcancelstate(state, NULL);
return 0;
}
/* Check if we recorded a mount fail for this key */
if (me->status >= monotonic_time(NULL)) {
ops->send_fail(ap->logopt,
ioctlfd, pkt->wait_queue_token, -ENOENT);
ops->close(ap->logopt, ioctlfd);
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_setcancelstate(state, NULL);
return 0;
}
len = strlen(me->key);
if (len >= PATH_MAX) {
error(ap->logopt, "direct mount path too long %s", me->key);
ops->send_fail(ap->logopt,
ioctlfd, pkt->wait_queue_token, -ENAMETOOLONG);
ops->close(ap->logopt, ioctlfd);
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_setcancelstate(state, NULL);
return 0;
}
mt = malloc(sizeof(struct pending_args));
if (!mt) {
char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
error(ap->logopt, "malloc: %s", estr);
ops->send_fail(ap->logopt,
ioctlfd, pkt->wait_queue_token, -ENOMEM);
ops->close(ap->logopt, ioctlfd);
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_setcancelstate(state, NULL);
return 0;
}
memset(mt, 0, sizeof(struct pending_args));
pending_cond_init(mt);
status = pthread_mutex_init(&mt->mutex, NULL);
if (status)
fatal(status);
pending_mutex_lock(mt);
mt->ap = ap;
mt->ioctlfd = ioctlfd;
mt->mc = mc;
strcpy(mt->name, me->key);
mt->len = len;
mt->dev = me->dev;
mt->type = NFY_MOUNT;
mt->uid = pkt->uid;
mt->gid = pkt->gid;
mt->pid = pkt->pid;
mt->wait_queue_token = pkt->wait_queue_token;
status = pthread_create(&thid, &th_attr_detached, do_mount_direct, mt);
if (status) {
error(ap->logopt, "missing mount thread create failed");
ops->send_fail(ap->logopt,
ioctlfd, pkt->wait_queue_token, -status);
ops->close(ap->logopt, ioctlfd);
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pending_mutex_unlock(mt);
pending_cond_destroy(mt);
pending_mutex_destroy(mt);
free_pending_args(mt);
pthread_setcancelstate(state, NULL);
return 1;
}
cache_unlock(mc);
master_source_unlock(ap->entry);
master_mutex_unlock();
pthread_cleanup_push(free_pending_args, mt);
pthread_cleanup_push(pending_mutex_destroy, mt);
pthread_cleanup_push(pending_cond_destroy, mt);
pthread_cleanup_push(pending_mutex_unlock, mt);
pthread_setcancelstate(state, NULL);
mt->signaled = 0;
while (!mt->signaled) {
clock_gettime(CLOCK_MONOTONIC, &wait);
wait.tv_sec += 2;
status = pthread_cond_timedwait(&mt->cond, &mt->mutex, &wait);
if (status && status != ETIMEDOUT)
fatal(status);
}
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
return 0;
}