#include <sys/mman.h>
#include <sys/time.h>
#include <libudev.h>
-#include <errno.h>
-#include "memory.h"
#include "debug.h"
#include "list.h"
#include "uevent.h"
#include "util.h"
#include "config.h"
#include "blacklist.h"
+#include "devmapper.h"
#define MAX_ACCUMULATION_COUNT 2048
#define MAX_ACCUMULATION_TIME 30*1000
typedef int (uev_trigger)(struct uevent *, void * trigger_data);
-LIST_HEAD(uevq);
-pthread_mutex_t uevq_lock = PTHREAD_MUTEX_INITIALIZER;
-pthread_mutex_t *uevq_lockp = &uevq_lock;
-pthread_cond_t uev_cond = PTHREAD_COND_INITIALIZER;
-pthread_cond_t *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) {
INIT_LIST_HEAD(&uev->node);
return uev;
}
-void
-uevq_cleanup(struct list_head *tmpq)
+static void uevq_cleanup(struct list_head *tmpq);
+
+static void cleanup_uev(void *arg)
+{
+ 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);
-
- if (uev->udev)
- udev_device_unref(uev->udev);
- FREE(uev);
+ cleanup_uev(uev);
}
}
-void
-uevent_get_wwid(struct uevent *uev)
+static const char* uevent_get_env_var(const struct uevent *uev,
+ const char *attr)
{
int i;
- char *uid_attribute;
- struct config * conf;
+ size_t len;
+ const char *p = NULL;
- conf = get_multipath_config();
- uid_attribute = parse_uid_attribute_by_attrs(conf->uid_attrs, uev->kernel);
- put_multipath_config(conf);
+ if (attr == NULL)
+ goto invalid;
- if (!uid_attribute)
- return;
+ len = strlen(attr);
+ if (len == 0)
+ goto invalid;
for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], uid_attribute, strlen(uid_attribute)) &&
- strlen(uev->envp[i]) > strlen(uid_attribute) &&
- uev->envp[i][strlen(uid_attribute)] == '=') {
- uev->wwid = uev->envp[i] + strlen(uid_attribute) + 1;
+ const char *var = uev->envp[i];
+
+ if (strlen(var) > len &&
+ !memcmp(var, attr, len) && var[len] == '=') {
+ p = var + len + 1;
break;
}
}
- free(uid_attribute);
+
+ condlog(4, "%s: %s -> '%s'", __func__, attr, p ?: "(null)");
+ return p;
+
+invalid:
+ condlog(2, "%s: empty variable name", __func__);
+ return NULL;
}
-bool
-uevent_need_merge(void)
+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;
+}
+
+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 (conf->uid_attrs)
+ if (VECTOR_SIZE(&conf->uid_attrs) > 0)
need_merge = true;
put_multipath_config(conf);
return need_merge;
}
-bool
-uevent_can_discard(struct uevent *uev)
+static bool uevent_can_discard(struct uevent *uev)
{
+ int invalid = 0;
struct config * conf;
/*
* 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) {
- put_multipath_config(conf);
- return true;
- }
- put_multipath_config(conf);
+ uev->kernel) > 0)
+ invalid = 1;
+ pthread_cleanup_pop(1);
+ if (invalid)
+ return true;
return false;
}
-bool
+static bool
uevent_can_filter(struct uevent *earlier, struct uevent *later)
{
return false;
}
-bool
+static bool
merge_need_stop(struct uevent *earlier, struct uevent *later)
{
/*
if (!earlier->wwid || !later->wwid)
return true;
/*
- * uevents merging stoped
+ * 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"
return false;
}
-bool
+static bool
uevent_can_merge(struct uevent *earlier, struct uevent *later)
{
/* merge paths uevents
- * whose wwids exsit and are same
+ * whose wwids exist and are same
* and actions are same,
* and actions are addition or deletion
*/
return false;
}
-void
+static void
uevent_prepare(struct list_head *tmpq)
{
struct uevent *uev, *tmp;
list_del_init(&uev->node);
if (uev->udev)
udev_device_unref(uev->udev);
- FREE(uev);
+ free(uev);
continue;
}
}
}
-void
+static void
uevent_filter(struct uevent *later, struct list_head *tmpq)
{
struct uevent *earlier, *tmp;
* by the later uevent
*/
if (uevent_can_filter(earlier, later)) {
- condlog(2, "uevent: %s-%s has filtered by uevent: %s-%s",
+ 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);
+ free(earlier);
}
}
}
-void
+static void
uevent_merge(struct uevent *later, struct list_head *tmpq)
{
struct uevent *earlier, *tmp;
* merge earlier uevents to the later uevent
*/
if (uevent_can_merge(earlier, later)) {
- condlog(2, "merged uevent: %s-%s-%s with uevent: %s-%s-%s",
+ condlog(3, "merged uevent: %s-%s-%s with uevent: %s-%s-%s",
earlier->action, earlier->kernel, earlier->wwid,
later->action, later->kernel, later->wwid);
}
}
-void
+static void
merge_uevq(struct list_head *tmpq)
{
struct uevent *later;
}
}
-void
+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");
-
- uevq_cleanup(&uev->merge_node);
-
- if (uev->udev)
- udev_device_unref(uev->udev);
- FREE(uev);
+ pthread_cleanup_pop(1);
}
}
udev_monitor_unref(monitor);
}
+static void cleanup_uevq(void *arg)
+{
+ uevq_cleanup(arg);
+}
+
+static void cleanup_global_uevq(void *arg __attribute__((unused)))
+{
+ pthread_mutex_lock(uevq_lockp);
+ uevq_cleanup(&uevq);
+ pthread_mutex_unlock(uevq_lockp);
+}
+
/*
* Service the uevent queue.
*/
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);
}
condlog(3, "Terminating uev service queue");
- uevq_cleanup(&uevq);
return 0;
}
-struct uevent *uevent_from_buffer(char *buf, ssize_t buflen)
-{
- struct uevent *uev;
- char *buffer;
- size_t bufpos;
- int i;
- char *pos;
-
- uev = alloc_uevent();
- if (!uev) {
- condlog(1, "lost uevent, oom");
- return NULL;
- }
-
- 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);
- FREE(uev);
- return NULL;
- }
- 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;
- /* Filter out sequence number */
- if (strncmp(key, "SEQNUM=", 7) == 0) {
- char *eptr;
-
- uev->seqnum = strtoul(key + 7, &eptr, 10);
- if (eptr == key + 7)
- uev->seqnum = -1;
- }
- bufpos += keylen + 1;
- }
- uev->envp[i] = NULL;
-
- condlog(3, "uevent %ld '%s' from '%s'", uev->seqnum,
- uev->action, uev->devpath);
- uev->kernel = strrchr(uev->devpath, '/');
- if (uev->kernel)
- uev->kernel++;
-
- /* print payload environment */
- for (i = 0; uev->envp[i] != NULL; i++)
- condlog(5, "%s", uev->envp[i]);
-
- return uev;
-}
-
-int failback_listen(void)
-{
- 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;
- const int feature_on = 1;
- /*
- * 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;
-
- sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (sock >= 0) {
-
- condlog(3, "reading events from udev socket.");
-
- /* 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;
- }
-
- /* enable receiving of the sender credentials */
- retval = setsockopt(sock, SOL_SOCKET, SO_PASSCRED,
- &feature_on, sizeof(feature_on));
- if (retval < 0) {
- condlog(0, "failed to enable credential passing, exit");
- goto exit;
- }
-
- } 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;
- }
-
- condlog(3, "reading events from kernel.");
-
- /*
- * 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));
-
- 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);
-
- /* enable receiving of the sender credentials */
- if (setsockopt(sock, SOL_SOCKET, SO_PASSCRED,
- &feature_on, sizeof(feature_on)) < 0) {
- condlog(0, "error on enabling credential passing for socket");
- exit(1);
- }
-
- retval = bind(sock, (struct sockaddr *) &snl,
- sizeof(struct sockaddr_nl));
- if (retval < 0) {
- condlog(0, "bind failed, exit");
- goto exit;
- }
- }
-
- while (1) {
- size_t bufpos;
- ssize_t buflen;
- struct uevent *uev;
- 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 = uevent_from_buffer(buf, buflen);
- if (!uev)
- continue;
- /*
- * 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);
- }
-
-exit:
- close(sock);
- return 1;
-}
-
-struct uevent *uevent_from_udev_device(struct udev_device *dev)
+static struct uevent *uevent_from_udev_device(struct udev_device *dev)
{
struct uevent *uev;
int i = 0;
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;
return uev;
}
-bool uevent_burst(struct timeval *start_time, int events)
+static bool uevent_burst(struct timeval *start_time, int events)
{
struct timeval diff_time, end_time;
unsigned long speed;
struct udev_monitor *monitor = NULL;
int fd, socket_flags, events;
struct timeval start_time;
- int need_failback = 1;
int timeout = 30;
LIST_HEAD(uevlisten_tmp);
monitor = udev_monitor_new_from_netlink(udev, "udev");
if (!monitor) {
condlog(2, "failed to create udev monitor");
- goto out;
+ goto out_udev;
}
pthread_cleanup_push(monitor_cleanup, monitor);
#ifdef LIBUDEV_API_RECVBUF
- if (udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024))
+ 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);
events = 0;
gettimeofday(&start_time, NULL);
+ pthread_cleanup_push(cleanup_global_uevq, NULL);
+ pthread_cleanup_push(cleanup_uevq, &uevlisten_tmp);
while (1) {
struct uevent *uev;
struct udev_device *dev;
poll_timeout = timeout * 1000;
errno = 0;
fdcount = poll(&ev_poll, 1, poll_timeout);
- if (fdcount && ev_poll.revents & POLLIN) {
+ if (fdcount > 0 && ev_poll.revents & POLLIN) {
timeout = uevent_burst(&start_time, events + 1) ? 1 : 0;
dev = udev_monitor_receive_device(monitor);
if (!dev) {
gettimeofday(&start_time, NULL);
timeout = 30;
}
- need_failback = 0;
+ pthread_cleanup_pop(1);
+ pthread_cleanup_pop(1);
out:
- if (monitor)
- pthread_cleanup_pop(1);
- if (need_failback)
- err = failback_listen();
+ pthread_cleanup_pop(1);
+out_udev:
pthread_cleanup_pop(1);
return err;
}
-int uevent_get_major(struct uevent *uev)
+char *uevent_get_dm_str(const struct uevent *uev, char *attr)
{
- char *p, *q;
- int i, major = -1;
+ const char *tmp = uevent_get_env_var(uev, attr);
- for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], "MAJOR", 5) && strlen(uev->envp[i]) > 6) {
- p = uev->envp[i] + 6;
- major = strtoul(p, &q, 10);
- if (p == q) {
- condlog(2, "invalid major '%s'", p);
- major = -1;
- }
- break;
- }
- }
- return major;
-}
-
-int uevent_get_minor(struct uevent *uev)
-{
- char *p, *q;
- int i, minor = -1;
-
- for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], "MINOR", 5) && strlen(uev->envp[i]) > 6) {
- p = uev->envp[i] + 6;
- minor = strtoul(p, &q, 10);
- if (p == q) {
- condlog(2, "invalid minor '%s'", p);
- minor = -1;
- }
- break;
- }
- }
- return minor;
-}
-
-int uevent_get_disk_ro(struct uevent *uev)
-{
- char *p, *q;
- int i, ro = -1;
-
- for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], "DISK_RO", 7) && strlen(uev->envp[i]) > 8) {
- p = uev->envp[i] + 8;
- ro = strtoul(p, &q, 10);
- if (p == q) {
- condlog(2, "invalid read_only setting '%s'", p);
- ro = -1;
- }
- break;
- }
- }
- return ro;
-}
-
-char *uevent_get_dm_name(struct uevent *uev)
-{
- char *p = NULL;
- int i;
-
- for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], "DM_NAME", 7) &&
- strlen(uev->envp[i]) > 8) {
- p = MALLOC(strlen(uev->envp[i] + 8) + 1);
- strcpy(p, uev->envp[i] + 8);
- break;
- }
- }
- return p;
-}
-
-char *uevent_get_dm_path(struct uevent *uev)
-{
- char *p = NULL;
- int i;
-
- for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], "DM_PATH", 7) &&
- strlen(uev->envp[i]) > 8) {
- p = MALLOC(strlen(uev->envp[i] + 8) + 1);
- strcpy(p, uev->envp[i] + 8);
- break;
- }
- }
- return p;
+ if (tmp == NULL)
+ return NULL;
+ return strdup(tmp);
}
-char *uevent_get_dm_action(struct uevent *uev)
+bool uevent_is_mpath(const struct uevent *uev)
{
- char *p = NULL;
- int i;
+ const char *uuid = uevent_get_env_var(uev, "DM_UUID");
- for (i = 0; uev->envp[i] != NULL; i++) {
- if (!strncmp(uev->envp[i], "DM_ACTION", 9) &&
- strlen(uev->envp[i]) > 10) {
- p = MALLOC(strlen(uev->envp[i] + 10) + 1);
- strcpy(p, uev->envp[i] + 10);
- break;
- }
- }
- return p;
+ 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