417 lines
12 KiB
C
417 lines
12 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License Version 1.0 (CDDL-1.0).
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* You can obtain a copy of the license from the top-level file
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* "OPENSOLARIS.LICENSE" or at <http://opensource.org/licenses/CDDL-1.0>.
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* You may not use this file except in compliance with the license.
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2016, 2017, Intel Corporation.
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*/
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#ifdef HAVE_LIBUDEV
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#include <errno.h>
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#include <fcntl.h>
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#include <libnvpair.h>
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#include <libudev.h>
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#include <libzfs.h>
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#include <libzutil.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/sysevent/eventdefs.h>
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#include <sys/sysevent/dev.h>
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#include "zed_log.h"
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#include "zed_disk_event.h"
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#include "agents/zfs_agents.h"
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/*
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* Portions of ZED need to see disk events for disks belonging to ZFS pools.
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* A libudev monitor is established to monitor block device actions and pass
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* them on to internal ZED logic modules. Initially, zfs_mod.c is the only
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* consumer and is the Linux equivalent for the illumos syseventd ZFS SLM
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* module responsible for handling disk events for ZFS.
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*/
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pthread_t g_mon_tid;
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struct udev *g_udev;
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struct udev_monitor *g_mon;
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#define DEV_BYID_PATH "/dev/disk/by-id/"
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/* 64MB is minimum usable disk for ZFS */
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#define MINIMUM_SECTORS 131072
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/*
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* Post disk event to SLM module
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*
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* occurs in the context of monitor thread
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*/
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static void
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zed_udev_event(const char *class, const char *subclass, nvlist_t *nvl)
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{
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char *strval;
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uint64_t numval;
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zed_log_msg(LOG_INFO, "zed_disk_event:");
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zed_log_msg(LOG_INFO, "\tclass: %s", class);
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zed_log_msg(LOG_INFO, "\tsubclass: %s", subclass);
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if (nvlist_lookup_string(nvl, DEV_NAME, &strval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %s", DEV_NAME, strval);
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if (nvlist_lookup_string(nvl, DEV_PATH, &strval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %s", DEV_PATH, strval);
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if (nvlist_lookup_string(nvl, DEV_IDENTIFIER, &strval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %s", DEV_IDENTIFIER, strval);
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if (nvlist_lookup_string(nvl, DEV_PHYS_PATH, &strval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %s", DEV_PHYS_PATH, strval);
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if (nvlist_lookup_uint64(nvl, DEV_SIZE, &numval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %llu", DEV_SIZE, numval);
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if (nvlist_lookup_uint64(nvl, ZFS_EV_POOL_GUID, &numval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %llu", ZFS_EV_POOL_GUID, numval);
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if (nvlist_lookup_uint64(nvl, ZFS_EV_VDEV_GUID, &numval) == 0)
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zed_log_msg(LOG_INFO, "\t%s: %llu", ZFS_EV_VDEV_GUID, numval);
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(void) zfs_agent_post_event(class, subclass, nvl);
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}
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/*
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* dev_event_nvlist: place event schema into an nv pair list
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*
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* NAME VALUE (example)
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* -------------- --------------------------------------------------------
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* DEV_NAME /dev/sdl
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* DEV_PATH /devices/pci0000:00/0000:00:03.0/0000:04:00.0/host0/...
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* DEV_IDENTIFIER ata-Hitachi_HTS725050A9A362_100601PCG420VLJ37DMC
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* DEV_PHYS_PATH pci-0000:04:00.0-sas-0x4433221101000000-lun-0
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* DEV_IS_PART ---
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* DEV_SIZE 500107862016
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* ZFS_EV_POOL_GUID 17523635698032189180
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* ZFS_EV_VDEV_GUID 14663607734290803088
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*/
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static nvlist_t *
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dev_event_nvlist(struct udev_device *dev)
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{
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nvlist_t *nvl;
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char strval[128];
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const char *value, *path;
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uint64_t guid;
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if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
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return (NULL);
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if (zfs_device_get_devid(dev, strval, sizeof (strval)) == 0)
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(void) nvlist_add_string(nvl, DEV_IDENTIFIER, strval);
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if (zfs_device_get_physical(dev, strval, sizeof (strval)) == 0)
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(void) nvlist_add_string(nvl, DEV_PHYS_PATH, strval);
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if ((path = udev_device_get_devnode(dev)) != NULL)
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(void) nvlist_add_string(nvl, DEV_NAME, path);
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if ((value = udev_device_get_devpath(dev)) != NULL)
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(void) nvlist_add_string(nvl, DEV_PATH, value);
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value = udev_device_get_devtype(dev);
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if ((value != NULL && strcmp("partition", value) == 0) ||
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(udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER")
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!= NULL)) {
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(void) nvlist_add_boolean(nvl, DEV_IS_PART);
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}
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if ((value = udev_device_get_sysattr_value(dev, "size")) != NULL) {
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uint64_t numval = DEV_BSIZE;
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numval *= strtoull(value, NULL, 10);
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(void) nvlist_add_uint64(nvl, DEV_SIZE, numval);
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}
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/*
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* Grab the pool and vdev guids from blkid cache
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*/
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value = udev_device_get_property_value(dev, "ID_FS_UUID");
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if (value != NULL && (guid = strtoull(value, NULL, 10)) != 0)
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(void) nvlist_add_uint64(nvl, ZFS_EV_POOL_GUID, guid);
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value = udev_device_get_property_value(dev, "ID_FS_UUID_SUB");
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if (value != NULL && (guid = strtoull(value, NULL, 10)) != 0)
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(void) nvlist_add_uint64(nvl, ZFS_EV_VDEV_GUID, guid);
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/*
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* Either a vdev guid or a devid must be present for matching
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*/
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if (!nvlist_exists(nvl, DEV_IDENTIFIER) &&
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!nvlist_exists(nvl, ZFS_EV_VDEV_GUID)) {
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nvlist_free(nvl);
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return (NULL);
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}
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return (nvl);
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}
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/*
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* Listen for block device uevents
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*/
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static void *
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zed_udev_monitor(void *arg)
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{
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struct udev_monitor *mon = arg;
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char *tmp, *tmp2;
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zed_log_msg(LOG_INFO, "Waiting for new udev disk events...");
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while (1) {
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struct udev_device *dev;
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const char *action, *type, *part, *sectors;
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const char *bus, *uuid;
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const char *class, *subclass;
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nvlist_t *nvl;
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boolean_t is_zfs = B_FALSE;
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/* allow a cancellation while blocked (recvmsg) */
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pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
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/* blocks at recvmsg until an event occurs */
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if ((dev = udev_monitor_receive_device(mon)) == NULL) {
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zed_log_msg(LOG_WARNING, "zed_udev_monitor: receive "
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"device error %d", errno);
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continue;
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}
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/* allow all steps to complete before a cancellation */
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
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/*
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* Strongly typed device is the preferred filter
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*/
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type = udev_device_get_property_value(dev, "ID_FS_TYPE");
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if (type != NULL && type[0] != '\0') {
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if (strcmp(type, "zfs_member") == 0) {
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is_zfs = B_TRUE;
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} else {
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/* not ours, so skip */
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zed_log_msg(LOG_INFO, "zed_udev_monitor: skip "
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"%s (in use by %s)",
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udev_device_get_devnode(dev), type);
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udev_device_unref(dev);
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continue;
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}
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}
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/*
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* if this is a disk and it is partitioned, then the
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* zfs label will reside in a DEVTYPE=partition and
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* we can skip passing this event
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*/
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type = udev_device_get_property_value(dev, "DEVTYPE");
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part = udev_device_get_property_value(dev,
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"ID_PART_TABLE_TYPE");
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if (type != NULL && type[0] != '\0' &&
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strcmp(type, "disk") == 0 &&
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part != NULL && part[0] != '\0') {
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/* skip and wait for partition event */
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udev_device_unref(dev);
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continue;
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}
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/*
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* ignore small partitions
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*/
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sectors = udev_device_get_property_value(dev,
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"ID_PART_ENTRY_SIZE");
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if (sectors == NULL)
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sectors = udev_device_get_sysattr_value(dev, "size");
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if (sectors != NULL &&
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strtoull(sectors, NULL, 10) < MINIMUM_SECTORS) {
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udev_device_unref(dev);
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continue;
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}
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/*
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* If the blkid probe didn't find ZFS, then a persistent
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* device id string is required in the message schema
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* for matching with vdevs. Preflight here for expected
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* udev information.
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*/
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bus = udev_device_get_property_value(dev, "ID_BUS");
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uuid = udev_device_get_property_value(dev, "DM_UUID");
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if (!is_zfs && (bus == NULL && uuid == NULL)) {
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zed_log_msg(LOG_INFO, "zed_udev_monitor: %s no devid "
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"source", udev_device_get_devnode(dev));
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udev_device_unref(dev);
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continue;
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}
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action = udev_device_get_action(dev);
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if (strcmp(action, "add") == 0) {
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class = EC_DEV_ADD;
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subclass = ESC_DISK;
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} else if (strcmp(action, "remove") == 0) {
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class = EC_DEV_REMOVE;
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subclass = ESC_DISK;
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} else if (strcmp(action, "change") == 0) {
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class = EC_DEV_STATUS;
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subclass = ESC_DEV_DLE;
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} else {
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zed_log_msg(LOG_WARNING, "zed_udev_monitor: %s unknown",
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action);
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udev_device_unref(dev);
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continue;
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}
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/*
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* Special case an EC_DEV_ADD for multipath devices
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*
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* When a multipath device is created, udev reports the
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* following:
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*
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* 1. "add" event of the dm device for the multipath device
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* (like /dev/dm-3).
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* 2. "change" event to create the actual multipath device
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* symlink (like /dev/mapper/mpatha). The event also
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* passes back the relevant DM vars we care about, like
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* DM_UUID.
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* 3. Another "change" event identical to #2 (that we ignore).
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*
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* To get the behavior we want, we treat the "change" event
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* in #2 as a "add" event; as if "/dev/mapper/mpatha" was
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* a new disk being added.
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*/
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if (strcmp(class, EC_DEV_STATUS) == 0 &&
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udev_device_get_property_value(dev, "DM_UUID") &&
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udev_device_get_property_value(dev, "MPATH_SBIN_PATH")) {
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tmp = (char *)udev_device_get_devnode(dev);
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tmp2 = zfs_get_underlying_path(tmp);
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if (tmp && tmp2 && (strcmp(tmp, tmp2) != 0)) {
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/*
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* We have a real underlying device, which
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* means that this multipath "change" event is
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* an "add" event.
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*
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* If the multipath device and the underlying
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* dev are the same name (i.e. /dev/dm-5), then
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* there is no real underlying disk for this
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* multipath device, and so this "change" event
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* really is a multipath removal.
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*/
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class = EC_DEV_ADD;
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subclass = ESC_DISK;
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} else {
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tmp = (char *)
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udev_device_get_property_value(dev,
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"DM_NR_VALID_PATHS");
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/* treat as a multipath remove */
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if (tmp != NULL && strcmp(tmp, "0") == 0) {
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class = EC_DEV_REMOVE;
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subclass = ESC_DISK;
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}
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}
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free(tmp2);
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}
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/*
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* Special case an EC_DEV_ADD for scsi_debug devices
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*
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* These devices require a udevadm trigger command after
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* creation in order to register the vdev_id scsidebug alias
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* rule (adds a persistent path (phys_path) used for fault
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* management automated tests in the ZFS test suite.
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*
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* After udevadm trigger command, event registers as a "change"
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* event but needs to instead be handled as another "add" event
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* to allow for disk labeling and partitioning to occur.
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*/
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if (strcmp(class, EC_DEV_STATUS) == 0 &&
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udev_device_get_property_value(dev, "ID_VDEV") &&
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udev_device_get_property_value(dev, "ID_MODEL")) {
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const char *id_model, *id_model_sd = "scsi_debug";
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id_model = udev_device_get_property_value(dev,
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"ID_MODEL");
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if (strcmp(id_model, id_model_sd) == 0) {
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class = EC_DEV_ADD;
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subclass = ESC_DISK;
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}
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}
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if ((nvl = dev_event_nvlist(dev)) != NULL) {
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zed_udev_event(class, subclass, nvl);
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nvlist_free(nvl);
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}
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udev_device_unref(dev);
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}
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return (NULL);
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}
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int
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zed_disk_event_init()
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{
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int fd, fflags;
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if ((g_udev = udev_new()) == NULL) {
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zed_log_msg(LOG_WARNING, "udev_new failed (%d)", errno);
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return (-1);
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}
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/* Set up a udev monitor for block devices */
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g_mon = udev_monitor_new_from_netlink(g_udev, "udev");
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udev_monitor_filter_add_match_subsystem_devtype(g_mon, "block", "disk");
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udev_monitor_filter_add_match_subsystem_devtype(g_mon, "block",
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"partition");
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udev_monitor_enable_receiving(g_mon);
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/* Make sure monitoring socket is blocking */
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fd = udev_monitor_get_fd(g_mon);
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if ((fflags = fcntl(fd, F_GETFL)) & O_NONBLOCK)
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(void) fcntl(fd, F_SETFL, fflags & ~O_NONBLOCK);
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/* spawn a thread to monitor events */
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if (pthread_create(&g_mon_tid, NULL, zed_udev_monitor, g_mon) != 0) {
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udev_monitor_unref(g_mon);
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udev_unref(g_udev);
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zed_log_msg(LOG_WARNING, "pthread_create failed");
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return (-1);
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}
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zed_log_msg(LOG_INFO, "zed_disk_event_init");
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return (0);
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}
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void
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zed_disk_event_fini()
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{
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/* cancel monitor thread at recvmsg() */
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(void) pthread_cancel(g_mon_tid);
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(void) pthread_join(g_mon_tid, NULL);
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/* cleanup udev resources */
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udev_monitor_unref(g_mon);
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udev_unref(g_udev);
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zed_log_msg(LOG_INFO, "zed_disk_event_fini");
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}
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#else
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#include "zed_disk_event.h"
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int
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zed_disk_event_init()
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{
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return (0);
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}
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void
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zed_disk_event_fini()
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{
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}
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#endif /* HAVE_LIBUDEV */
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