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platform_system_core/vold/volmgr.c

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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <unistd.h>
#include <sched.h>
#include <sys/mount.h>
#include <cutils/config_utils.h>
#include <cutils/properties.h>
#include "vold.h"
#include "volmgr.h"
#include "blkdev.h"
#include "ums.h"
#include "volmgr_ext3.h"
#include "volmgr_vfat.h"
#define DEBUG_VOLMGR 0
static volume_t *vol_root = NULL;
static struct volmgr_fstable_entry fs_table[] = {
{ "ext3", ext3_identify, ext3_check, ext3_mount },
{ "vfat", vfat_identify, vfat_check, vfat_mount },
{ NULL, NULL, NULL, NULL }
};
struct _volume_state_event_map {
volume_state_t state;
char *event;
char *property_val;
};
static struct _volume_state_event_map volume_state_strings[] = {
{ volstate_unknown, "volstate_unknown:", "unknown" },
{ volstate_nomedia, VOLD_EVT_NOMEDIA, VOLD_ES_PVAL_NOMEDIA },
{ volstate_unmounted, VOLD_EVT_UNMOUNTED, VOLD_ES_PVAL_UNMOUNTED },
{ volstate_checking, VOLD_EVT_CHECKING, VOLD_ES_PVAL_CHECKING },
{ volstate_mounted, VOLD_EVT_MOUNTED, VOLD_ES_PVAL_MOUNTED },
{ volstate_mounted_ro, VOLD_EVT_MOUNTED_RO, VOLD_ES_PVAL_MOUNTED_RO },
{ volstate_badremoval, VOLD_EVT_BADREMOVAL, VOLD_ES_PVAL_BADREMOVAL },
{ volstate_damaged, VOLD_EVT_DAMAGED, VOLD_ES_PVAL_DAMAGED },
{ volstate_nofs, VOLD_EVT_NOFS, VOLD_ES_PVAL_NOFS },
{ volstate_ums, VOLD_EVT_UMS, VOLD_ES_PVAL_UMS },
{ 0, NULL, NULL }
};
static int volmgr_readconfig(char *cfg_path);
static int volmgr_config_volume(cnode *node);
static volume_t *volmgr_lookup_volume_by_mediapath(char *media_path, boolean fuzzy);
static volume_t *volmgr_lookup_volume_by_dev(blkdev_t *dev);
static int _volmgr_start(volume_t *vol, blkdev_t *dev);
static int volmgr_start_fs(struct volmgr_fstable_entry *fs, volume_t *vol, blkdev_t *dev);
static void *volmgr_start_fs_thread(void *arg);
static void volmgr_start_fs_thread_sighandler(int signo);
static void volume_setstate(volume_t *vol, volume_state_t state);
static char *conv_volstate_to_eventstr(volume_state_t state);
static char *conv_volstate_to_propstr(volume_state_t state);
static int volume_send_state(volume_t *vol);
static void _cb_volstopped_for_ums_enable(volume_t *v);
static int _volmgr_enable_ums(volume_t *);
static int volmgr_shutdown_volume(volume_t *v, void (* cb) (volume_t *));
static int volmgr_stop_volume(volume_t *v, void (*cb) (volume_t *, void *), void *arg, int emit_statechange);
static void _cb_volume_stopped_for_eject(volume_t *v, void *arg);
static void _cb_volume_stopped_for_shutdown(volume_t *v, void *arg);
static int _volmgr_consider_disk_and_vol(volume_t *vol, blkdev_t *dev);
static void volmgr_uncage_reaper(volume_t *vol);
static void volmgr_reaper_thread_sighandler(int signo);
/*
* Public functions
*/
int volmgr_bootstrap(void)
{
int rc;
if ((rc = volmgr_readconfig("/system/etc/vold.conf")) < 0) {
LOGE("Unable to process config\n");
return rc;
}
return 0;
}
int volmgr_send_states(void)
{
volume_t *vol_scan = vol_root;
int rc;
while (vol_scan) {
pthread_mutex_lock(&vol_scan->lock);
if ((rc = volume_send_state(vol_scan)) < 0) {
LOGE("Error sending state to framework (%d)\n", rc);
}
pthread_mutex_unlock(&vol_scan->lock);
vol_scan = vol_scan->next;
}
return 0;
}
/*
* Called when a block device is ready to be
* evaluated by the volume manager.
*/
int volmgr_consider_disk(blkdev_t *dev)
{
volume_t *vol;
if (!(vol = volmgr_lookup_volume_by_mediapath(dev->media->devpath, true))) {
LOG_VOL("volmgr ignoring '%s' - no matching volume found\n", dev->media->devpath);
return 0;
}
pthread_mutex_lock(&vol->lock);
int rc = _volmgr_consider_disk_and_vol(vol, dev);
pthread_mutex_unlock(&vol->lock);
return rc;
}
int volmgr_start_volume_by_mountpoint(char *mount_point)
{
volume_t *v = vol_root;
while(v) {
if (!strcmp(v->mount_point, mount_point)) {
pthread_mutex_lock(&v->lock);
if (!v->dev) {
LOGE("Cannot start volume '%s' (volume is not bound to a blkdev)\n", mount_point);
pthread_mutex_unlock(&v->lock);
return -ENOENT;
}
if (_volmgr_consider_disk_and_vol(v, v->dev->disk) < 0) {
LOGE("volmgr failed to start volume '%s'\n", v->mount_point);
}
pthread_mutex_unlock(&v->lock);
return 0;
}
v = v->next;
}
return -ENOENT;
}
int volmgr_stop_volume_by_mountpoint(char *mount_point)
{
volume_t *v = vol_root;
while(v) {
if (!strcmp(v->mount_point, mount_point)) {
pthread_mutex_lock(&v->lock);
if (volmgr_shutdown_volume(v, _cb_volstopped_for_ums_enable) < 0)
LOGE("unable to shutdown volume '%s'\n", v->mount_point);
pthread_mutex_unlock(&v->lock);
return 0;
}
v = v->next;
}
return -ENOENT;
}
int volmgr_notify_eject(blkdev_t *dev, void (* cb) (blkdev_t *))
{
#if DEBUG_VOLMGR
LOG_VOL("volmgr_notify_eject(%s)\n", dev->dev_fspath);
#endif
volume_t *v;
// XXX: Partitioning support is going to need us to stop *all*
// devices in this volume
if (!(v = volmgr_lookup_volume_by_dev(dev))) {
if (cb)
cb(dev);
return 0;
}
pthread_mutex_lock(&v->lock);
if (v->state == volstate_mounted)
volume_setstate(v, volstate_badremoval);
int rc = volmgr_stop_volume(v, _cb_volume_stopped_for_eject, cb, false);
pthread_mutex_unlock(&v->lock);
return rc;
}
static void _cb_volume_stopped_for_eject(volume_t *v, void *arg)
{
void (* eject_cb) (blkdev_t *) = arg;
LOG_VOL("Volume %s has been stopped for eject\n", v->mount_point);
eject_cb(v->dev);
v->dev = NULL; // Clear dev because its being ejected
}
/*
* Instructs the volume manager to enable or disable USB mass storage
* on any volumes configured to use it.
*/
int volmgr_enable_ums(boolean enable)
{
volume_t *v = vol_root;
while(v) {
if (v->ums_path) {
int rc;
pthread_mutex_lock(&v->lock);
if (enable) {
// Stop the volume, and enable UMS in the callback
if ((rc = volmgr_shutdown_volume(v, _cb_volstopped_for_ums_enable)) < 0)
LOGE("unable to shutdown volume '%s'\n", v->mount_point);
} else {
// Disable UMS
if ((rc = ums_disable(v->ums_path)) < 0) {
LOGE("unable to disable ums on '%s'\n", v->mount_point);
pthread_mutex_unlock(&v->lock);
continue;
}
volume_setstate(v, volstate_unmounted);
LOG_VOL("Kick-starting volume '%s' after UMS disable\n", v->dev->disk->dev_fspath);
// Start volume
if ((rc = _volmgr_consider_disk_and_vol(v, v->dev->disk)) < 0) {
LOGE("volmgr failed to consider disk '%s'\n", v->dev->disk->dev_fspath);
}
}
pthread_mutex_unlock(&v->lock);
}
v = v->next;
}
return 0;
}
/*
* Static functions
*/
// vol->lock must be held!
static int _volmgr_consider_disk_and_vol(volume_t *vol, blkdev_t *dev)
{
int rc = 0;
#if DEBUG_VOLMGR
LOG_VOL("volmgr_consider_disk_and_vol(%s, %s):\n", vol->mount_point, dev->dev_fspath);
#endif
if (vol->state != volstate_nomedia && vol->state != volstate_unmounted) {
LOGE("Volume manager is already handling volume '%s' (currently in state %d)\n", vol->mount_point, vol->state);
return -EADDRINUSE;
}
volume_setstate(vol, volstate_unmounted);
LOG_VOL("Evaluating dev '%s' for mountable filesystems for '%s'\n", dev->devpath, vol->mount_point);
if (dev->nr_parts == 0) {
rc = _volmgr_start(vol, dev);
#if DEBUG_VOLMGR
LOG_VOL("_volmgr_start(%s, %s) rc = %d\n", vol->mount_point, dev->dev_fspath ,rc);
#endif
} else {
/*
* Device has multiple partitions
* This is where interesting partition policies could be implemented.
* For now just try them in sequence until one succeeds
*/
rc = -ENODEV;
int i;
for (i = 0; i < dev->nr_parts; i++) {
blkdev_t *part = blkdev_lookup_by_devno(dev->major, (i+1));
if (!part) {
LOGE("Error - unable to lookup partition for blkdev %d:%d\n", dev->major, (i+1));
continue;
}
rc = _volmgr_start(vol, part);
#if DEBUG_VOLMGR
LOG_VOL("_volmgr_start(%s, %s) rc = %d\n", vol->mount_point, part->dev_fspath, rc);
#endif
if (!rc)
break;
}
if (rc == -ENODEV) {
// Assert to make sure each partition had a backing blkdev
LOGE("Internal consistency error\n");
return 0;
}
}
if (rc == -ENODATA) {
LOGE("Device %s contains no usable filesystems\n", dev->dev_fspath);
rc = 0;
}
return rc;
}
static void volmgr_reaper_thread_sighandler(int signo)
{
LOGE("volmgr reaper thread got signal %d\n", signo);
}
static void __reaper_cleanup(void *arg)
{
volume_t *vol = (volume_t *) arg;
LOG_VOL("__reaper_cleanup(%s):\n", vol->mount_point);
vol->worker_running = false;
// Wake up anyone that was waiting on this thread
pthread_mutex_unlock(&vol->worker_sem);
// Unlock the volume
pthread_mutex_unlock(&vol->lock);
}
static void *volmgr_reaper_thread(void *arg)
{
volume_t *vol = (volume_t *) arg;
pthread_cleanup_push(__reaper_cleanup, arg);
pthread_mutex_lock(&vol->lock);
vol->worker_running = true;
vol->worker_pid = getpid();
struct sigaction actions;
memset(&actions, 0, sizeof(actions));
sigemptyset(&actions.sa_mask);
actions.sa_flags = 0;
actions.sa_handler = volmgr_reaper_thread_sighandler;
sigaction(SIGUSR1, &actions, NULL);
LOG_VOL("Worker thread pid %d reaping %s\n", getpid(), vol->mount_point);
boolean send_sig_kill = false;
int i, rc;
for (i = 0; i < 10; i++) {
rc = umount(vol->mount_point);
LOG_VOL("volmngr reaper umount(%s) attempt %d rc = %d\n",
vol->mount_point, i + 1, rc);
if (!rc)
break;
if (rc && (errno == EINVAL || errno == ENOENT)) {
rc = 0;
break;
}
KillProcessesWithOpenFiles(vol->mount_point, send_sig_kill, NULL, 0);
sleep(1);
if (!send_sig_kill)
send_sig_kill = true;
}
if (!rc) {
LOG_VOL("Reaper sucessfully unmounted %s\n", vol->mount_point);
volume_setstate(vol, volstate_unmounted);
} else {
LOGE("Unable to unmount!! (%d)\n", rc);
}
out:
pthread_cleanup_pop(1);
pthread_exit(NULL);
return NULL;
}
static void volmgr_uncage_reaper(volume_t *vol)
{
if (vol->worker_running) {
LOGE("Worker thread is currently running.. waiting..\n");
pthread_mutex_lock(&vol->worker_sem);
LOG_VOL("Worker thread now available\n");
}
vol->worker_args.fs = NULL;
vol->worker_args.dev = NULL;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&vol->worker_thread, &attr, volmgr_reaper_thread, vol);
}
static int volmgr_stop_volume(volume_t *v, void (*cb) (volume_t *, void *), void *arg, boolean emit_statechange)
{
int i, rc;
if (v->state == volstate_mounted || v->state == volstate_badremoval) {
// Try to unmount right away (5 retries)
for (i = 0; i < 5; i++) {
rc = umount(v->mount_point);
LOG_VOL("volmngr quick stop umount(%s) attempt %d rc = %d\n",
v->mount_point, i + 1, rc);
if (!rc)
break;
if (rc && (errno == EINVAL || errno == ENOENT)) {
rc = 0;
break;
}
sched_yield();
}
if (!rc) {
LOG_VOL("volmgr_stop_volume(%s): Volume unmounted sucessfully\n",
v->mount_point);
if (emit_statechange)
volume_setstate(v, volstate_unmounted);
goto out_cb_immed;
}
/*
* Since the volume is still in use, dispatch the stopping to
* a thread
*/
LOG_VOL("Volume %s is busy (%d) - uncaging the reaper\n", v->mount_point, rc);
volmgr_uncage_reaper(v);
return -EINPROGRESS;
} else if (v->state == volstate_checking) {
volume_setstate(v, volstate_unmounted);
if (v->worker_running) {
LOG_VOL("Cancelling worker thread\n");
pthread_kill(v->worker_thread, SIGUSR1);
} else
LOGE("Strange... we were in checking state but worker thread wasn't running..\n");
goto out_cb_immed;
}
LOGE("volmgr: nothing to do to stop vol '%s' (in state %d)\n",
v->mount_point, v->state);
out_cb_immed:
if (cb)
cb(v, arg);
return 0;
}
/*
* Gracefully stop a volume
*/
static int volmgr_shutdown_volume(volume_t *v, void (* cb) (volume_t *))
{
return volmgr_stop_volume(v, NULL, cb, true);
}
static void _cb_volume_stopped_for_shutdown(volume_t *v, void *arg)
{
void (* shutdown_cb) (volume_t *) = arg;
LOG_VOL("Volume %s has been stopped for shutdown\n", v->mount_point);
shutdown_cb(v);
}
/*
* Called when a volume is sucessfully unmounted for UMS enable
*/
static void _cb_volstopped_for_ums_enable(volume_t *v)
{
int rc;
if ((rc = ums_enable(v->dev->dev_fspath, v->ums_path)) < 0) {
LOGE("Error enabling ums (%d)\n", rc);
return;
}
volume_setstate(v, volstate_ums);
}
static int volmgr_readconfig(char *cfg_path)
{
cnode *root = config_node("", "");
cnode *node;
config_load_file(root, cfg_path);
node = root->first_child;
while (node) {
if (!strcmp(node->name, "volume"))
volmgr_config_volume(node);
else
LOGE("Skipping unknown configuration node '%s'\n", node->name);
node = node->next;
}
return 0;
}
static int volmgr_config_volume(cnode *node)
{
volume_t *new;
int rc = 0;
if (!(new = malloc(sizeof(volume_t))))
return -ENOMEM;
memset(new, 0, sizeof(volume_t));
new->state = volstate_nomedia;
pthread_mutex_init(&new->lock, NULL);
pthread_mutex_init(&new->worker_sem, NULL);
cnode *child = node->first_child;
while (child) {
if (!strcmp(child->name, "media_path"))
new->media_path = strdup(child->value);
else if (!strcmp(child->name, "media_type")) {
if (!strcmp(child->value, "mmc"))
new->media_type = media_mmc;
else {
LOGE("Invalid media type '%s'\n", child->value);
rc = -EINVAL;
goto out_free;
}
} else if (!strcmp(child->name, "mount_point"))
new->mount_point = strdup(child->value);
else if (!strcmp(child->name, "ums_path"))
new->ums_path = strdup(child->value);
else
LOGE("Ignoring unknown config entry '%s'\n", child->name);
child = child->next;
}
if (!new->media_path || !new->mount_point || new->media_type == media_unknown) {
LOGE("Required configuration parameter missing for volume\n");
rc = -EINVAL;
goto out_free;
}
if (!vol_root)
vol_root = new;
else {
volume_t *scan = vol_root;
while (scan->next)
scan = scan->next;
scan->next = new;
}
return rc;
out_free:
if (new->media_path)
free(new->media_path);
if (new->mount_point)
free(new->mount_point);
if (new->ums_path)
free(new->ums_path);
return rc;
}
static volume_t *volmgr_lookup_volume_by_dev(blkdev_t *dev)
{
volume_t *scan = vol_root;
while(scan) {
if (scan->dev == dev)
return scan;
scan = scan->next;
}
return NULL;
}
static volume_t *volmgr_lookup_volume_by_mediapath(char *media_path, boolean fuzzy)
{
volume_t *scan = vol_root;
volume_t *res = NULL;
while (scan) {
if (fuzzy) {
if (!strncmp(media_path, scan->media_path, strlen(scan->media_path))) {
if (!res)
res = scan;
else {
LOGE("Warning - multiple matching volumes for media '%s' - using first\n", media_path);
break;
}
}
} else if (!strcmp(media_path, scan->media_path))
return scan;
scan = scan->next;
}
return res;
}
/*
* Attempt to bring a volume online
* Returns: 0 on success, errno on failure, with the following exceptions:
* - ENODATA - Unsupported filesystem type / blank
* vol->lock MUST be held!
*/
static int _volmgr_start(volume_t *vol, blkdev_t *dev)
{
struct volmgr_fstable_entry *fs;
int rc = ENODATA;
#if DEBUG_VOLMGR
LOG_VOL("_volmgr_start(%s, %s):\n", vol->mount_point, dev->dev_fspath);
#endif
for (fs = fs_table; fs->name; fs++) {
if (!fs->identify_fn(dev))
break;
}
if (!fs) {
LOGE("No supported filesystems on %s\n", dev->dev_fspath);
volume_setstate(vol, volstate_nofs);
return -ENODATA;
}
return volmgr_start_fs(fs, vol, dev);
}
// vol->lock MUST be held!
static int volmgr_start_fs(struct volmgr_fstable_entry *fs, volume_t *vol, blkdev_t *dev)
{
/*
* Spawn a thread to do the actual checking / mounting in
*/
if (vol->worker_running) {
LOGE("Worker thread is currently running.. waiting..\n");
pthread_mutex_lock(&vol->worker_sem);
LOG_VOL("Worker thread now available\n");
}
vol->dev = dev;
vol->worker_args.fs = fs;
vol->worker_args.dev = dev;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&vol->worker_thread, &attr, volmgr_start_fs_thread, vol);
return 0;
}
static void __start_fs_thread_lock_cleanup(void *arg)
{
volume_t *vol = (volume_t *) arg;
LOG_VOL("__start_fs_thread_lock_cleanup(%s):\n", vol->mount_point);
vol->worker_running = false;
// Wake up anyone that was waiting on this thread
pthread_mutex_unlock(&vol->worker_sem);
// Unlock the volume
pthread_mutex_unlock(&vol->lock);
}
static void *volmgr_start_fs_thread(void *arg)
{
volume_t *vol = (volume_t *) arg;
pthread_cleanup_push(__start_fs_thread_lock_cleanup, arg);
pthread_mutex_lock(&vol->lock);
vol->worker_running = true;
vol->worker_pid = getpid();
struct sigaction actions;
memset(&actions, 0, sizeof(actions));
sigemptyset(&actions.sa_mask);
actions.sa_flags = 0;
actions.sa_handler = volmgr_start_fs_thread_sighandler;
sigaction(SIGUSR1, &actions, NULL);
struct volmgr_fstable_entry *fs = vol->worker_args.fs;
blkdev_t *dev = vol->worker_args.dev;
int rc;
LOG_VOL("Worker thread pid %d starting %s fs %s on %s\n", getpid(), fs->name, dev->dev_fspath, vol->mount_point);
if (fs->check_fn) {
LOG_VOL("Starting %s filesystem check on %s\n", fs->name, dev->dev_fspath);
volume_setstate(vol, volstate_checking);
pthread_mutex_unlock(&vol->lock);
rc = fs->check_fn(dev);
pthread_mutex_lock(&vol->lock);
if (vol->state != volstate_checking) {
LOG_VOL("filesystem check aborted\n");
goto out;
}
if (rc < 0) {
LOG_VOL("%s filesystem check failed on %s\n", fs->name, dev->dev_fspath);
goto out_unmountable;
}
LOG_VOL("%s filesystem check of %s OK\n", fs->name, dev->dev_fspath);
}
rc = fs->mount_fn(dev, vol);
if (!rc) {
LOG_VOL("Sucessfully mounted %s filesystem %s on %s\n", fs->name, dev->devpath, vol->mount_point);
volume_setstate(vol, volstate_mounted);
goto out;
}
LOGE("%s filesystem mount of %s failed (%d)\n", fs->name, dev->devpath, rc);
out_unmountable:
volume_setstate(vol, volstate_damaged);
out:
pthread_cleanup_pop(1);
pthread_exit(NULL);
return NULL;
}
static void volmgr_start_fs_thread_sighandler(int signo)
{
LOGE("volmgr thread got signal %d\n", signo);
}
static void volume_setstate(volume_t *vol, volume_state_t state)
{
LOG_VOL("Volume %s state change from %d -> %d\n", vol->mount_point, vol->state, state);
vol->state = state;
char *prop_val = conv_volstate_to_propstr(vol->state);
property_set(PROP_EXTERNAL_STORAGE_STATE, prop_val);
volume_send_state(vol);
}
static int volume_send_state(volume_t *vol)
{
char *event = conv_volstate_to_eventstr(vol->state);
return send_msg_with_data(event, vol->mount_point);
}
static char *conv_volstate_to_eventstr(volume_state_t state)
{
int i;
for (i = 0; volume_state_strings[i].event != NULL; i++) {
if (volume_state_strings[i].state == state)
break;
}
if (!volume_state_strings[i].event)
LOGE("conv_volstate_to_eventstr(%d): Invalid state\n", state);
return volume_state_strings[i].event;
}
static char *conv_volstate_to_propstr(volume_state_t state)
{
int i;
for (i = 0; volume_state_strings[i].event != NULL; i++) {
if (volume_state_strings[i].state == state)
break;
}
if (!volume_state_strings[i].event)
LOGE("conv_volstate_to_propval(%d): Invalid state\n", state);
return volume_state_strings[i].property_val;
}
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