* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <unistd.h>
#include <stdio.h>
+#include <stdbool.h>
#include <errno.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/user.h>
#include <sys/un.h>
+#include <poll.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include <pthread.h>
-#include <limits.h>
#include <sys/mman.h>
-#include <errno.h>
+#include <sys/time.h>
+#include <libudev.h>
-#include "memory.h"
#include "debug.h"
#include "list.h"
#include "uevent.h"
+#include "vector.h"
+#include "structs.h"
+#include "util.h"
+#include "config.h"
+#include "blacklist.h"
+#include "devmapper.h"
+
+#define MAX_ACCUMULATION_COUNT 2048
+#define MAX_ACCUMULATION_TIME 30*1000
+#define MIN_BURST_SPEED 10
typedef int (uev_trigger)(struct uevent *, void * trigger_data);
-pthread_t uevq_thr;
-LIST_HEAD(uevq);
-pthread_mutex_t uevq_lock, *uevq_lockp = &uevq_lock;
-pthread_cond_t uev_cond, *uev_condp = &uev_cond;
-uev_trigger *my_uev_trigger;
-void * my_trigger_data;
-int servicing_uev;
+static LIST_HEAD(uevq);
+static pthread_mutex_t uevq_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t *uevq_lockp = &uevq_lock;
+static pthread_cond_t uev_cond = PTHREAD_COND_INITIALIZER;
+static pthread_cond_t *uev_condp = &uev_cond;
+static uev_trigger *my_uev_trigger;
+static void *my_trigger_data;
+static int servicing_uev;
int is_uevent_busy(void)
{
struct uevent * alloc_uevent (void)
{
- struct uevent *uev = MALLOC(sizeof(struct uevent));
+ struct uevent *uev = calloc(1, sizeof(struct uevent));
- if (uev)
+ if (uev) {
INIT_LIST_HEAD(&uev->node);
+ INIT_LIST_HEAD(&uev->merge_node);
+ }
return uev;
}
-void
-setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
+static void uevq_cleanup(struct list_head *tmpq);
+
+static void cleanup_uev(void *arg)
{
- if (pthread_attr_init(attr)) {
- fprintf(stderr, "can't initialize thread attr: %s\n",
- strerror(errno));
- exit(1);
+ struct uevent *uev = arg;
+
+ uevq_cleanup(&uev->merge_node);
+ if (uev->udev)
+ udev_device_unref(uev->udev);
+ free(uev);
+}
+
+static void uevq_cleanup(struct list_head *tmpq)
+{
+ struct uevent *uev, *tmp;
+
+ list_for_each_entry_safe(uev, tmp, tmpq, node) {
+ list_del_init(&uev->node);
+ cleanup_uev(uev);
}
- if (stacksize < PTHREAD_STACK_MIN)
- stacksize = PTHREAD_STACK_MIN;
+}
+
+static const char* uevent_get_env_var(const struct uevent *uev,
+ const char *attr)
+{
+ int i;
+ size_t len;
+ const char *p = NULL;
+
+ if (attr == NULL)
+ goto invalid;
- if (pthread_attr_setstacksize(attr, stacksize)) {
- fprintf(stderr, "can't set thread stack size to %lu: %s\n",
- (unsigned long)stacksize, strerror(errno));
- exit(1);
+ len = strlen(attr);
+ if (len == 0)
+ goto invalid;
+
+ for (i = 0; uev->envp[i] != NULL; i++) {
+ const char *var = uev->envp[i];
+
+ if (strlen(var) > len &&
+ !memcmp(var, attr, len) && var[len] == '=') {
+ p = var + len + 1;
+ break;
+ }
}
- if (detached && pthread_attr_setdetachstate(attr,
- PTHREAD_CREATE_DETACHED)) {
- fprintf(stderr, "can't set thread to detached: %s\n",
- strerror(errno));
- exit(1);
+
+ condlog(4, "%s: %s -> '%s'", __func__, attr, p ?: "(null)");
+ return p;
+
+invalid:
+ condlog(2, "%s: empty variable name", __func__);
+ return NULL;
+}
+
+int uevent_get_env_positive_int(const struct uevent *uev,
+ const char *attr)
+{
+ const char *p = uevent_get_env_var(uev, attr);
+ char *q;
+ int ret;
+
+ if (p == NULL || *p == '\0')
+ return -1;
+
+ ret = strtoul(p, &q, 10);
+ if (*q != '\0' || ret < 0) {
+ condlog(2, "%s: invalid %s: '%s'", __func__, attr, p);
+ return -1;
}
+ return ret;
}
-/*
- * Called with uevq_lockp held
- */
void
+uevent_get_wwid(struct uevent *uev)
+{
+ char *uid_attribute;
+ const char *val;
+ struct config * conf;
+
+ conf = get_multipath_config();
+ pthread_cleanup_push(put_multipath_config, conf);
+ uid_attribute = get_uid_attribute_by_attrs(conf, uev->kernel);
+ pthread_cleanup_pop(1);
+
+ val = uevent_get_env_var(uev, uid_attribute);
+ if (val)
+ uev->wwid = val;
+}
+
+static bool uevent_need_merge(void)
+{
+ struct config * conf;
+ bool need_merge = false;
+
+ conf = get_multipath_config();
+ if (VECTOR_SIZE(&conf->uid_attrs) > 0)
+ need_merge = true;
+ put_multipath_config(conf);
+
+ return need_merge;
+}
+
+static bool uevent_can_discard(struct uevent *uev)
+{
+ int invalid = 0;
+ struct config * conf;
+
+ /*
+ * do not filter dm devices by devnode
+ */
+ if (!strncmp(uev->kernel, "dm-", 3))
+ return false;
+ /*
+ * filter paths devices by devnode
+ */
+ conf = get_multipath_config();
+ pthread_cleanup_push(put_multipath_config, conf);
+ if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
+ uev->kernel) > 0)
+ invalid = 1;
+ pthread_cleanup_pop(1);
+
+ if (invalid)
+ return true;
+ return false;
+}
+
+static bool
+uevent_can_filter(struct uevent *earlier, struct uevent *later)
+{
+
+ /*
+ * filter earlier uvents if path has removed later. Eg:
+ * "add path1 |chang path1 |add path2 |remove path1"
+ * can filter as:
+ * "add path2 |remove path1"
+ * uevents "add path1" and "chang path1" are filtered out
+ */
+ if (!strcmp(earlier->kernel, later->kernel) &&
+ !strcmp(later->action, "remove") &&
+ strncmp(later->kernel, "dm-", 3)) {
+ return true;
+ }
+
+ /*
+ * filter change uvents if add uevents exist. Eg:
+ * "change path1| add path1 |add path2"
+ * can filter as:
+ * "add path1 |add path2"
+ * uevent "chang path1" is filtered out
+ */
+ if (!strcmp(earlier->kernel, later->kernel) &&
+ !strcmp(earlier->action, "change") &&
+ !strcmp(later->action, "add") &&
+ strncmp(later->kernel, "dm-", 3)) {
+ return true;
+ }
+
+ return false;
+}
+
+static bool
+merge_need_stop(struct uevent *earlier, struct uevent *later)
+{
+ /*
+ * dm uevent do not try to merge with left uevents
+ */
+ if (!strncmp(later->kernel, "dm-", 3))
+ return true;
+
+ /*
+ * we can not make a jugement without wwid,
+ * so it is sensible to stop merging
+ */
+ if (!earlier->wwid || !later->wwid)
+ return true;
+ /*
+ * uevents merging stopped
+ * when we meet an opposite action uevent from the same LUN to AVOID
+ * "add path1 |remove path1 |add path2 |remove path2 |add path3"
+ * to merge as "remove path1, path2" and "add path1, path2, path3"
+ * OR
+ * "remove path1 |add path1 |remove path2 |add path2 |remove path3"
+ * to merge as "add path1, path2" and "remove path1, path2, path3"
+ * SO
+ * when we meet a non-change uevent from the same LUN
+ * with the same wwid and different action
+ * it would be better to stop merging.
+ */
+ if (!strcmp(earlier->wwid, later->wwid) &&
+ strcmp(earlier->action, later->action) &&
+ strcmp(earlier->action, "change") &&
+ strcmp(later->action, "change"))
+ return true;
+
+ return false;
+}
+
+static bool
+uevent_can_merge(struct uevent *earlier, struct uevent *later)
+{
+ /* merge paths uevents
+ * whose wwids exist and are same
+ * and actions are same,
+ * and actions are addition or deletion
+ */
+ if (earlier->wwid && later->wwid &&
+ !strcmp(earlier->wwid, later->wwid) &&
+ !strcmp(earlier->action, later->action) &&
+ strncmp(earlier->action, "change", 6) &&
+ strncmp(earlier->kernel, "dm-", 3)) {
+ return true;
+ }
+
+ return false;
+}
+
+static void
+uevent_prepare(struct list_head *tmpq)
+{
+ struct uevent *uev, *tmp;
+
+ list_for_each_entry_reverse_safe(uev, tmp, tmpq, node) {
+ if (uevent_can_discard(uev)) {
+ list_del_init(&uev->node);
+ if (uev->udev)
+ udev_device_unref(uev->udev);
+ free(uev);
+ continue;
+ }
+
+ if (strncmp(uev->kernel, "dm-", 3) &&
+ uevent_need_merge())
+ uevent_get_wwid(uev);
+ }
+}
+
+static void
+uevent_filter(struct uevent *later, struct list_head *tmpq)
+{
+ struct uevent *earlier, *tmp;
+
+ list_for_some_entry_reverse_safe(earlier, tmp, &later->node, tmpq, node) {
+ /*
+ * filter unnessary earlier uevents
+ * by the later uevent
+ */
+ if (uevent_can_filter(earlier, later)) {
+ condlog(3, "uevent: %s-%s has filtered by uevent: %s-%s",
+ earlier->kernel, earlier->action,
+ later->kernel, later->action);
+
+ list_del_init(&earlier->node);
+ if (earlier->udev)
+ udev_device_unref(earlier->udev);
+ free(earlier);
+ }
+ }
+}
+
+static void
+uevent_merge(struct uevent *later, struct list_head *tmpq)
+{
+ struct uevent *earlier, *tmp;
+
+ list_for_some_entry_reverse_safe(earlier, tmp, &later->node, tmpq, node) {
+ if (merge_need_stop(earlier, later))
+ break;
+ /*
+ * merge earlier uevents to the later uevent
+ */
+ if (uevent_can_merge(earlier, later)) {
+ condlog(3, "merged uevent: %s-%s-%s with uevent: %s-%s-%s",
+ earlier->action, earlier->kernel, earlier->wwid,
+ later->action, later->kernel, later->wwid);
+
+ list_move(&earlier->node, &later->merge_node);
+ }
+ }
+}
+
+static void
+merge_uevq(struct list_head *tmpq)
+{
+ struct uevent *later;
+
+ uevent_prepare(tmpq);
+ list_for_each_entry_reverse(later, tmpq, node) {
+ uevent_filter(later, tmpq);
+ if(uevent_need_merge())
+ uevent_merge(later, tmpq);
+ }
+}
+
+static void
service_uevq(struct list_head *tmpq)
{
struct uevent *uev, *tmp;
list_for_each_entry_safe(uev, tmp, tmpq, node) {
list_del_init(&uev->node);
+ pthread_cleanup_push(cleanup_uev, uev);
if (my_uev_trigger && my_uev_trigger(uev, my_trigger_data))
condlog(0, "uevent trigger error");
-
- FREE(uev);
+ pthread_cleanup_pop(1);
}
}
-static void uevq_stop(void *arg)
+static void uevent_cleanup(void *arg)
+{
+ struct udev *udev = arg;
+
+ condlog(3, "Releasing uevent_listen() resources");
+ udev_unref(udev);
+}
+
+static void monitor_cleanup(void *arg)
+{
+ struct udev_monitor *monitor = arg;
+
+ condlog(3, "Releasing uevent_monitor() resources");
+ udev_monitor_unref(monitor);
+}
+
+static void cleanup_uevq(void *arg)
+{
+ uevq_cleanup(arg);
+}
+
+static void cleanup_global_uevq(void *arg __attribute__((unused)))
{
- condlog(3, "Stopping uev queue");
pthread_mutex_lock(uevq_lockp);
- my_uev_trigger = NULL;
- pthread_cond_signal(uev_condp);
+ uevq_cleanup(&uevq);
pthread_mutex_unlock(uevq_lockp);
}
/*
* Service the uevent queue.
*/
-static void *
-uevq_thread(void * et)
+int uevent_dispatch(int (*uev_trigger)(struct uevent *, void * trigger_data),
+ void * trigger_data)
{
+ my_uev_trigger = uev_trigger;
+ my_trigger_data = trigger_data;
+
mlockall(MCL_CURRENT | MCL_FUTURE);
while (1) {
LIST_HEAD(uevq_tmp);
+ pthread_cleanup_push(cleanup_mutex, uevq_lockp);
pthread_mutex_lock(uevq_lockp);
servicing_uev = 0;
/*
}
servicing_uev = 1;
list_splice_init(&uevq, &uevq_tmp);
- pthread_mutex_unlock(uevq_lockp);
+ pthread_cleanup_pop(1);
+
if (!my_uev_trigger)
break;
+
+ pthread_cleanup_push(cleanup_uevq, &uevq_tmp);
+ merge_uevq(&uevq_tmp);
service_uevq(&uevq_tmp);
+ pthread_cleanup_pop(1);
}
- return NULL;
+ condlog(3, "Terminating uev service queue");
+ return 0;
}
-int uevent_listen(int (*uev_trigger)(struct uevent *, void * trigger_data),
- void * trigger_data)
+static struct uevent *uevent_from_udev_device(struct udev_device *dev)
{
- int sock;
- struct sockaddr_nl snl;
- struct sockaddr_un sun;
- socklen_t addrlen;
- int retval;
- int rcvbufsz = 128*1024;
- int rcvsz = 0;
- int rcvszsz = sizeof(rcvsz);
- unsigned int *prcvszsz = (unsigned int *)&rcvszsz;
- pthread_attr_t attr;
- const int feature_on = 1;
-
- my_uev_trigger = uev_trigger;
- my_trigger_data = trigger_data;
+ struct uevent *uev;
+ int i = 0;
+ char *pos, *end;
+ struct udev_list_entry *list_entry;
+
+ uev = alloc_uevent();
+ if (!uev) {
+ udev_device_unref(dev);
+ condlog(1, "lost uevent, oom");
+ return NULL;
+ }
+ pos = uev->buffer;
+ end = pos + HOTPLUG_BUFFER_SIZE + OBJECT_SIZE - 1;
+ udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(dev)) {
+ const char *name, *value;
+ int bytes;
+
+ name = udev_list_entry_get_name(list_entry);
+ if (!name)
+ name = "(null)";
+ value = udev_list_entry_get_value(list_entry);
+ if (!value)
+ value = "(null)";
+ bytes = snprintf(pos, end - pos, "%s=%s", name, value);
+ if (pos + bytes >= end) {
+ condlog(2, "buffer overflow for uevent");
+ break;
+ }
+ uev->envp[i] = pos;
+ pos += bytes;
+ *pos = '\0';
+ pos++;
+ if (strcmp(name, "DEVPATH") == 0)
+ uev->devpath = uev->envp[i] + 8;
+ if (strcmp(name, "ACTION") == 0)
+ uev->action = uev->envp[i] + 7;
+ i++;
+ if (i == HOTPLUG_NUM_ENVP - 1)
+ break;
+ }
+ if (!uev->devpath || ! uev->action) {
+ udev_device_unref(dev);
+ condlog(1, "uevent missing necessary fields");
+ free(uev);
+ return NULL;
+ }
+ uev->udev = dev;
+ uev->envp[i] = NULL;
- /*
- * Queue uevents for service by dedicated thread so that the uevent
- * listening thread does not block on multipathd locks (vecs->lock)
- * thereby not getting to empty the socket's receive buffer queue
- * often enough.
- */
- INIT_LIST_HEAD(&uevq);
+ condlog(3, "uevent '%s' from '%s'", uev->action, uev->devpath);
+ uev->kernel = strrchr(uev->devpath, '/');
+ if (uev->kernel)
+ uev->kernel++;
- pthread_mutex_init(uevq_lockp, NULL);
- pthread_cond_init(uev_condp, NULL);
+ /* print payload environment */
+ for (i = 0; uev->envp[i] != NULL; i++)
+ condlog(5, "%s", uev->envp[i]);
+ return uev;
+}
- pthread_cleanup_push(uevq_stop, NULL);
- setup_thread_attr(&attr, 64 * 1024, 0);
- pthread_create(&uevq_thr, &attr, uevq_thread, NULL);
+static bool uevent_burst(struct timeval *start_time, int events)
+{
+ struct timeval diff_time, end_time;
+ unsigned long speed;
+ unsigned long eclipse_ms;
- /*
- * First check whether we have a udev socket
- */
- memset(&sun, 0x00, sizeof(struct sockaddr_un));
- sun.sun_family = AF_LOCAL;
- strcpy(&sun.sun_path[1], "/org/kernel/dm/multipath_event");
- addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(sun.sun_path+1) + 1;
+ if(events > MAX_ACCUMULATION_COUNT) {
+ condlog(2, "burst got %u uevents, too much uevents, stopped", events);
+ return false;
+ }
- sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (sock >= 0) {
+ gettimeofday(&end_time, NULL);
+ timersub(&end_time, start_time, &diff_time);
- condlog(3, "reading events from udev socket.");
+ eclipse_ms = diff_time.tv_sec * 1000 + diff_time.tv_usec / 1000;
- /* the bind takes care of ensuring only one copy running */
- retval = bind(sock, (struct sockaddr *) &sun, addrlen);
- if (retval < 0) {
- condlog(0, "bind failed, exit");
- goto exit;
- }
+ if (eclipse_ms == 0)
+ return true;
- /* enable receiving of the sender credentials */
- setsockopt(sock, SOL_SOCKET, SO_PASSCRED,
- &feature_on, sizeof(feature_on));
-
- } else {
- /* Fallback to read kernel netlink events */
- memset(&snl, 0x00, sizeof(struct sockaddr_nl));
- snl.nl_family = AF_NETLINK;
- snl.nl_pid = getpid();
- snl.nl_groups = 0x01;
-
- sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
- if (sock == -1) {
- condlog(0, "error getting socket, exit");
- return 1;
- }
+ if (eclipse_ms > MAX_ACCUMULATION_TIME) {
+ condlog(2, "burst continued %lu ms, too long time, stopped", eclipse_ms);
+ return false;
+ }
- condlog(3, "reading events from kernel.");
+ speed = (events * 1000) / eclipse_ms;
+ if (speed > MIN_BURST_SPEED)
+ return true;
- /*
- * try to avoid dropping uevents, even so, this is not a guarantee,
- * but it does help to change the netlink uevent socket's
- * receive buffer threshold from the default value of 106,496 to
- * the maximum value of 262,142.
- */
- retval = setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &rcvbufsz,
- sizeof(rcvbufsz));
+ return false;
+}
- if (retval < 0) {
- condlog(0, "error setting receive buffer size for socket, exit");
- exit(1);
- }
- retval = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &rcvsz, prcvszsz);
- if (retval < 0) {
- condlog(0, "error setting receive buffer size for socket, exit");
- exit(1);
- }
- condlog(3, "receive buffer size for socket is %u.", rcvsz);
+int uevent_listen(struct udev *udev)
+{
+ int err = 2;
+ struct udev_monitor *monitor = NULL;
+ int fd, socket_flags, events;
+ struct timeval start_time;
+ int timeout = 30;
+ LIST_HEAD(uevlisten_tmp);
- /* enable receiving of the sender credentials */
- setsockopt(sock, SOL_SOCKET, SO_PASSCRED,
- &feature_on, sizeof(feature_on));
+ /*
+ * Queue uevents for service by dedicated thread so that the uevent
+ * listening thread does not block on multipathd locks (vecs->lock)
+ * thereby not getting to empty the socket's receive buffer queue
+ * often enough.
+ */
+ if (!udev) {
+ condlog(1, "no udev context");
+ return 1;
+ }
+ udev_ref(udev);
+ pthread_cleanup_push(uevent_cleanup, udev);
- retval = bind(sock, (struct sockaddr *) &snl,
- sizeof(struct sockaddr_nl));
- if (retval < 0) {
- condlog(0, "bind failed, exit");
- goto exit;
- }
+ monitor = udev_monitor_new_from_netlink(udev, "udev");
+ if (!monitor) {
+ condlog(2, "failed to create udev monitor");
+ goto out_udev;
+ }
+ pthread_cleanup_push(monitor_cleanup, monitor);
+#ifdef LIBUDEV_API_RECVBUF
+ if (udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024) < 0)
+ condlog(2, "failed to increase buffer size");
+#endif
+ fd = udev_monitor_get_fd(monitor);
+ if (fd < 0) {
+ condlog(2, "failed to get monitor fd");
+ goto out;
+ }
+ socket_flags = fcntl(fd, F_GETFL);
+ if (socket_flags < 0) {
+ condlog(2, "failed to get monitor socket flags : %s",
+ strerror(errno));
+ goto out;
+ }
+ if (fcntl(fd, F_SETFL, socket_flags & ~O_NONBLOCK) < 0) {
+ condlog(2, "failed to set monitor socket flags : %s",
+ strerror(errno));
+ goto out;
+ }
+ err = udev_monitor_filter_add_match_subsystem_devtype(monitor, "block",
+ "disk");
+ if (err)
+ condlog(2, "failed to create filter : %s", strerror(-err));
+ err = udev_monitor_enable_receiving(monitor);
+ if (err) {
+ condlog(2, "failed to enable receiving : %s", strerror(-err));
+ goto out;
}
+ events = 0;
+ gettimeofday(&start_time, NULL);
+ pthread_cleanup_push(cleanup_global_uevq, NULL);
+ pthread_cleanup_push(cleanup_uevq, &uevlisten_tmp);
while (1) {
- int i;
- char *pos;
- size_t bufpos;
- ssize_t buflen;
struct uevent *uev;
- char *buffer;
- struct msghdr smsg;
- struct iovec iov;
- char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
- struct cmsghdr *cmsg;
- struct ucred *cred;
- static char buf[HOTPLUG_BUFFER_SIZE + OBJECT_SIZE];
-
- memset(buf, 0x00, sizeof(buf));
- iov.iov_base = &buf;
- iov.iov_len = sizeof(buf);
- memset (&smsg, 0x00, sizeof(struct msghdr));
- smsg.msg_iov = &iov;
- smsg.msg_iovlen = 1;
- smsg.msg_control = cred_msg;
- smsg.msg_controllen = sizeof(cred_msg);
-
- buflen = recvmsg(sock, &smsg, 0);
- if (buflen < 0) {
- if (errno != EINTR)
- condlog(0, "error receiving message, errno %d", errno);
- continue;
- }
-
- cmsg = CMSG_FIRSTHDR(&smsg);
- if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- condlog(3, "no sender credentials received, message ignored");
- continue;
- }
-
- cred = (struct ucred *)CMSG_DATA(cmsg);
- if (cred->uid != 0) {
- condlog(3, "sender uid=%d, message ignored", cred->uid);
- continue;
- }
-
- /* skip header */
- bufpos = strlen(buf) + 1;
- if (bufpos < sizeof("a@/d") || bufpos >= sizeof(buf)) {
- condlog(3, "invalid message length");
- continue;
- }
-
- /* check message header */
- if (strstr(buf, "@/") == NULL) {
- condlog(3, "unrecognized message header");
- continue;
- }
- if ((size_t)buflen > sizeof(buf)-1) {
- condlog(2, "buffer overflow for received uevent");
- buflen = sizeof(buf)-1;
- }
-
- uev = alloc_uevent();
-
- if (!uev) {
- condlog(1, "lost uevent, oom");
+ struct udev_device *dev;
+ struct pollfd ev_poll;
+ int poll_timeout;
+ int fdcount;
+
+ memset(&ev_poll, 0, sizeof(struct pollfd));
+ ev_poll.fd = fd;
+ ev_poll.events = POLLIN;
+ poll_timeout = timeout * 1000;
+ errno = 0;
+ fdcount = poll(&ev_poll, 1, poll_timeout);
+ if (fdcount > 0 && ev_poll.revents & POLLIN) {
+ timeout = uevent_burst(&start_time, events + 1) ? 1 : 0;
+ dev = udev_monitor_receive_device(monitor);
+ if (!dev) {
+ condlog(0, "failed getting udev device");
+ continue;
+ }
+ uev = uevent_from_udev_device(dev);
+ if (!uev)
+ continue;
+ list_add_tail(&uev->node, &uevlisten_tmp);
+ events++;
continue;
}
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
- if ((size_t)buflen > sizeof(buf)-1)
- buflen = sizeof(buf)-1;
-
- /*
- * Copy the shared receive buffer contents to buffer private
- * to this uevent so we can immediately reuse the shared buffer.
- */
- memcpy(uev->buffer, buf, HOTPLUG_BUFFER_SIZE + OBJECT_SIZE);
- buffer = uev->buffer;
- buffer[buflen] = '\0';
-
- /* save start of payload */
- bufpos = strlen(buffer) + 1;
-
- /* action string */
- uev->action = buffer;
- pos = strchr(buffer, '@');
- if (!pos) {
- condlog(3, "bad action string '%s'", buffer);
- continue;
+ condlog(0, "error receiving "
+ "uevent message: %m");
+ err = -errno;
+ break;
}
- pos[0] = '\0';
-
- /* sysfs path */
- uev->devpath = &pos[1];
-
- /* hotplug events have the environment attached - reconstruct envp[] */
- for (i = 0; (bufpos < (size_t)buflen) && (i < HOTPLUG_NUM_ENVP-1); i++) {
- int keylen;
- char *key;
-
- key = &buffer[bufpos];
- keylen = strlen(key);
- uev->envp[i] = key;
- bufpos += keylen + 1;
+ if (!list_empty(&uevlisten_tmp)) {
+ /*
+ * Queue uevents and poke service pthread.
+ */
+ condlog(3, "Forwarding %d uevents", events);
+ pthread_mutex_lock(uevq_lockp);
+ list_splice_tail_init(&uevlisten_tmp, &uevq);
+ pthread_cond_signal(uev_condp);
+ pthread_mutex_unlock(uevq_lockp);
+ events = 0;
}
- uev->envp[i] = NULL;
-
- condlog(3, "uevent '%s' from '%s'", uev->action, uev->devpath);
-
- /* print payload environment */
- for (i = 0; uev->envp[i] != NULL; i++)
- condlog(3, "%s", uev->envp[i]);
-
- /*
- * Queue uevent and poke service pthread.
- */
- pthread_mutex_lock(uevq_lockp);
- list_add_tail(&uev->node, &uevq);
- pthread_cond_signal(uev_condp);
- pthread_mutex_unlock(uevq_lockp);
+ gettimeofday(&start_time, NULL);
+ timeout = 30;
}
+ pthread_cleanup_pop(1);
+ pthread_cleanup_pop(1);
+out:
+ pthread_cleanup_pop(1);
+out_udev:
+ pthread_cleanup_pop(1);
+ return err;
+}
-exit:
- close(sock);
+char *uevent_get_dm_str(const struct uevent *uev, char *attr)
+{
+ const char *tmp = uevent_get_env_var(uev, attr);
- pthread_cleanup_pop(1);
+ if (tmp == NULL)
+ return NULL;
+ return strdup(tmp);
+}
- pthread_mutex_destroy(uevq_lockp);
- pthread_cond_destroy(uev_condp);
+bool uevent_is_mpath(const struct uevent *uev)
+{
+ const char *uuid = uevent_get_env_var(uev, "DM_UUID");
- return 1;
+ if (uuid == NULL)
+ return false;
+ if (strncmp(uuid, UUID_PREFIX, UUID_PREFIX_LEN))
+ return false;
+ return uuid[UUID_PREFIX_LEN] != '\0';
}
projects / platform / upstream / multipath-tools.git / blobdiff