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device-mapper-multipath/0025-multipath-centralize-validation-code.patch

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device-mapper-multipath-0.8.4-2 Rebased on top of Martin Wilck's queue of ACKed upstream commits * https://github.com/openSUSE/multipath-tools/tree/upstream-queue * All previous patches have been reordered, with the exception of 0011-libdmmp-Add-support-for-upcoming-json-c-0.14.0.patch which has been replaced with 0029-fix-boolean-value-with-json-c-0.14.patch Modify 0054-RH-add-mpathconf.patch * remove default enable_foreign and property blacklist_exceptions settings, and deal with the builtin default change from 0031-libmultipath-set-enable_foreign-to-NONE-by-default.patch. Fixes bz #1853668 Add 0048-Makefile.inc-trim-extra-information-from-systemd-ver.patch Add 0049-kpartx-fix-Wsign-compare-error.patch * The above two patches have been submitted upstream
2020-07-09 04:16:57 +00:00
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Benjamin Marzinski <bmarzins@redhat.com>
Date: Tue, 19 May 2020 12:08:42 -0500
Subject: [PATCH] multipath: centralize validation code
This code pulls the multipath path validation code out of configure(),
and puts it into its own function, check_path_valid(). This function
calls a new libmultipath function, is_path_valid() to check just path
requested. This seperation exists so that is_path_valid() can be reused
by future code. This code will give almost the same answer as the
existing code, with the exception that now, if a device is currently
multipathed, it will always be a valid multipath path.
Reviewed-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
libmultipath/Makefile | 2 +-
libmultipath/devmapper.c | 45 ++++++
libmultipath/devmapper.h | 1 +
libmultipath/structs.h | 24 +---
libmultipath/valid.c | 118 ++++++++++++++++
libmultipath/valid.h | 42 ++++++
libmultipath/wwids.c | 10 +-
multipath/main.c | 296 +++++++++++++++++----------------------
8 files changed, 343 insertions(+), 195 deletions(-)
create mode 100644 libmultipath/valid.c
create mode 100644 libmultipath/valid.h
diff --git a/libmultipath/Makefile b/libmultipath/Makefile
index f19b7ad2..e5dac5ea 100644
--- a/libmultipath/Makefile
+++ b/libmultipath/Makefile
@@ -48,7 +48,7 @@ OBJS = memory.o parser.o vector.o devmapper.o callout.o \
log.o configure.o structs_vec.o sysfs.o prio.o checkers.o \
lock.o file.o wwids.o prioritizers/alua_rtpg.o prkey.o \
io_err_stat.o dm-generic.o generic.o foreign.o nvme-lib.o \
- libsg.o
+ libsg.o valid.o
all: $(LIBS)
diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
index 7ed494a1..27d52398 100644
--- a/libmultipath/devmapper.c
+++ b/libmultipath/devmapper.c
@@ -770,6 +770,51 @@ out:
return r;
}
+/*
+ * Return
+ * 1 : map with uuid exists
+ * 0 : map with uuid doesn't exist
+ * -1 : error
+ */
+int
+dm_map_present_by_uuid(const char *uuid)
+{
+ struct dm_task *dmt;
+ struct dm_info info;
+ char prefixed_uuid[WWID_SIZE + UUID_PREFIX_LEN];
+ int r = -1;
+
+ if (!uuid || uuid[0] == '\0')
+ return 0;
+
+ if (safe_sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid))
+ goto out;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
+ goto out;
+
+ dm_task_no_open_count(dmt);
+
+ if (!dm_task_set_uuid(dmt, prefixed_uuid))
+ goto out_task;
+
+ if (!dm_task_run(dmt))
+ goto out_task;
+
+ if (!dm_task_get_info(dmt, &info))
+ goto out_task;
+
+ r = !!info.exists;
+
+out_task:
+ dm_task_destroy(dmt);
+out:
+ if (r < 0)
+ condlog(3, "%s: dm command failed in %s: %s", uuid,
+ __FUNCTION__, strerror(errno));
+ return r;
+}
+
static int
dm_dev_t (const char * mapname, char * dev_t, int len)
{
diff --git a/libmultipath/devmapper.h b/libmultipath/devmapper.h
index 17fc9faf..5ed7edc5 100644
--- a/libmultipath/devmapper.h
+++ b/libmultipath/devmapper.h
@@ -39,6 +39,7 @@ int dm_simplecmd_noflush (int, const char *, uint16_t);
int dm_addmap_create (struct multipath *mpp, char *params);
int dm_addmap_reload (struct multipath *mpp, char *params, int flush);
int dm_map_present (const char *);
+int dm_map_present_by_uuid(const char *uuid);
int dm_get_map(const char *, unsigned long long *, char *);
int dm_get_status(const char *, char *);
int dm_type(const char *, char *);
diff --git a/libmultipath/structs.h b/libmultipath/structs.h
index 9bd39eb1..d69bc2e9 100644
--- a/libmultipath/structs.h
+++ b/libmultipath/structs.h
@@ -101,29 +101,13 @@ enum yes_no_undef_states {
YNU_YES,
};
-#define _FIND_MULTIPATHS_F (1 << 1)
-#define _FIND_MULTIPATHS_I (1 << 2)
-#define _FIND_MULTIPATHS_N (1 << 3)
-/*
- * _FIND_MULTIPATHS_F must have the same value as YNU_YES.
- * Generate a compile time error if that isn't the case.
- */
-extern char ___error1___[-(_FIND_MULTIPATHS_F != YNU_YES)];
-
-#define find_multipaths_on(conf) \
- (!!((conf)->find_multipaths & _FIND_MULTIPATHS_F))
-#define ignore_wwids_on(conf) \
- (!!((conf)->find_multipaths & _FIND_MULTIPATHS_I))
-#define ignore_new_devs_on(conf) \
- (!!((conf)->find_multipaths & _FIND_MULTIPATHS_N))
-
enum find_multipaths_states {
FIND_MULTIPATHS_UNDEF = YNU_UNDEF,
FIND_MULTIPATHS_OFF = YNU_NO,
- FIND_MULTIPATHS_ON = _FIND_MULTIPATHS_F,
- FIND_MULTIPATHS_GREEDY = _FIND_MULTIPATHS_I,
- FIND_MULTIPATHS_SMART = _FIND_MULTIPATHS_F|_FIND_MULTIPATHS_I,
- FIND_MULTIPATHS_STRICT = _FIND_MULTIPATHS_F|_FIND_MULTIPATHS_N,
+ FIND_MULTIPATHS_ON = YNU_YES,
+ FIND_MULTIPATHS_GREEDY,
+ FIND_MULTIPATHS_SMART,
+ FIND_MULTIPATHS_STRICT,
__FIND_MULTIPATHS_LAST,
};
diff --git a/libmultipath/valid.c b/libmultipath/valid.c
new file mode 100644
index 00000000..456b1f6e
--- /dev/null
+++ b/libmultipath/valid.c
@@ -0,0 +1,118 @@
+/*
+ Copyright (c) 2020 Benjamin Marzinski, IBM
+
+ 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; 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <stddef.h>
+#include <errno.h>
+#include <libudev.h>
+
+#include "vector.h"
+#include "config.h"
+#include "debug.h"
+#include "util.h"
+#include "devmapper.h"
+#include "discovery.h"
+#include "wwids.h"
+#include "sysfs.h"
+#include "blacklist.h"
+#include "mpath_cmd.h"
+#include "valid.h"
+
+int
+is_path_valid(const char *name, struct config *conf, struct path *pp,
+ bool check_multipathd)
+{
+ int r;
+ int fd;
+
+ if (!pp || !name || !conf)
+ return PATH_IS_ERROR;
+
+ if (conf->find_multipaths <= FIND_MULTIPATHS_UNDEF ||
+ conf->find_multipaths >= __FIND_MULTIPATHS_LAST)
+ return PATH_IS_ERROR;
+
+ if (safe_sprintf(pp->dev, "%s", name))
+ return PATH_IS_ERROR;
+
+ if (sysfs_is_multipathed(pp, true)) {
+ if (pp->wwid[0] == '\0')
+ return PATH_IS_ERROR;
+ return PATH_IS_VALID_NO_CHECK;
+ }
+
+ /*
+ * "multipath -u" may be run before the daemon is started. In this
+ * case, systemd might own the socket but might delay multipathd
+ * startup until some other unit (udev settle!) has finished
+ * starting. With many LUNs, the listen backlog may be exceeded, which
+ * would cause connect() to block. This causes udev workers calling
+ * "multipath -u" to hang, and thus creates a deadlock, until "udev
+ * settle" times out. To avoid this, call connect() in non-blocking
+ * mode here, and take EAGAIN as indication for a filled-up systemd
+ * backlog.
+ */
+
+ if (check_multipathd) {
+ fd = __mpath_connect(1);
+ if (fd < 0) {
+ if (errno != EAGAIN && !systemd_service_enabled(name)) {
+ condlog(3, "multipathd not running or enabled");
+ return PATH_IS_NOT_VALID;
+ }
+ } else
+ mpath_disconnect(fd);
+ }
+
+ pp->udev = udev_device_new_from_subsystem_sysname(udev, "block", name);
+ if (!pp->udev)
+ return PATH_IS_ERROR;
+
+ r = pathinfo(pp, conf, DI_SYSFS | DI_WWID | DI_BLACKLIST);
+ if (r == PATHINFO_SKIPPED)
+ return PATH_IS_NOT_VALID;
+ else if (r)
+ return PATH_IS_ERROR;
+
+ if (pp->wwid[0] == '\0')
+ return PATH_IS_NOT_VALID;
+
+ if (pp->udev && pp->uid_attribute &&
+ filter_property(conf, pp->udev, 3, pp->uid_attribute) > 0)
+ return PATH_IS_NOT_VALID;
+
+ r = is_failed_wwid(pp->wwid);
+ if (r != WWID_IS_NOT_FAILED) {
+ if (r == WWID_IS_FAILED)
+ return PATH_IS_NOT_VALID;
+ return PATH_IS_ERROR;
+ }
+
+ if (conf->find_multipaths == FIND_MULTIPATHS_GREEDY)
+ return PATH_IS_VALID;
+
+ if (check_wwids_file(pp->wwid, 0) == 0)
+ return PATH_IS_VALID_NO_CHECK;
+
+ if (dm_map_present_by_uuid(pp->wwid) == 1)
+ return PATH_IS_VALID;
+
+ /* all these act like FIND_MULTIPATHS_STRICT for finding if a
+ * path is valid */
+ if (conf->find_multipaths != FIND_MULTIPATHS_SMART)
+ return PATH_IS_NOT_VALID;
+
+ return PATH_IS_MAYBE_VALID;
+}
diff --git a/libmultipath/valid.h b/libmultipath/valid.h
new file mode 100644
index 00000000..ce1c7cbf
--- /dev/null
+++ b/libmultipath/valid.h
@@ -0,0 +1,42 @@
+/*
+ Copyright (c) 2020 Benjamin Marzinski, IBM
+
+ 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; 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef _VALID_H
+#define _VALID_H
+
+/*
+ * PATH_IS_VALID_NO_CHECK is returned when multipath should claim
+ * the path, regardless of whether is has been released to systemd
+ * already.
+ * PATH_IS_VALID is returned by is_path_valid, when the path is
+ * valid only if it hasn't been released to systemd already.
+ * PATH_IS_MAYBE_VALID is returned when the the path would be valid
+ * if other paths with the same wwid existed. It is up to the caller
+ * to check for these other paths.
+ */
+enum is_path_valid_result {
+ PATH_IS_ERROR = -1,
+ PATH_IS_NOT_VALID,
+ PATH_IS_VALID,
+ PATH_IS_VALID_NO_CHECK,
+ PATH_IS_MAYBE_VALID,
+ PATH_MAX_VALID_RESULT, /* only for bounds checking */
+};
+
+int is_path_valid(const char *name, struct config *conf, struct path *pp,
+ bool check_multipathd);
+
+#endif /* _VALID_D */
diff --git a/libmultipath/wwids.c b/libmultipath/wwids.c
index 28a2150d..637cb0ab 100644
--- a/libmultipath/wwids.c
+++ b/libmultipath/wwids.c
@@ -289,19 +289,19 @@ out:
int
should_multipath(struct path *pp1, vector pathvec, vector mpvec)
{
- int i, ignore_new_devs, find_multipaths;
+ int i, find_multipaths;
struct path *pp2;
struct config *conf;
conf = get_multipath_config();
- ignore_new_devs = ignore_new_devs_on(conf);
- find_multipaths = find_multipaths_on(conf);
+ find_multipaths = conf->find_multipaths;
put_multipath_config(conf);
- if (!find_multipaths && !ignore_new_devs)
+ if (find_multipaths == FIND_MULTIPATHS_OFF ||
+ find_multipaths == FIND_MULTIPATHS_GREEDY)
return 1;
condlog(4, "checking if %s should be multipathed", pp1->dev);
- if (!ignore_new_devs) {
+ if (find_multipaths != FIND_MULTIPATHS_STRICT) {
char tmp_wwid[WWID_SIZE];
struct multipath *mp = find_mp_by_wwid(mpvec, pp1->wwid);
diff --git a/multipath/main.c b/multipath/main.c
index 545ead87..953fab27 100644
--- a/multipath/main.c
+++ b/multipath/main.c
@@ -63,21 +63,18 @@
#include "propsel.h"
#include "time-util.h"
#include "file.h"
+#include "valid.h"
int logsink;
struct udev *udev;
struct config *multipath_conf;
/*
- * Return values of configure(), print_cmd_valid(), and main().
- * RTVL_{YES,NO} are synonyms for RTVL_{OK,FAIL} for the CMD_VALID_PATH case.
+ * Return values of configure(), check_path_valid(), and main().
*/
enum {
RTVL_OK = 0,
- RTVL_YES = RTVL_OK,
RTVL_FAIL = 1,
- RTVL_NO = RTVL_FAIL,
- RTVL_MAYBE, /* only used internally, never returned */
RTVL_RETRY, /* returned by configure(), not by main() */
};
@@ -269,9 +266,6 @@ get_dm_mpvec (enum mpath_cmds cmd, vector curmp, vector pathvec, char * refwwid)
continue;
}
- if (cmd == CMD_VALID_PATH)
- continue;
-
dm_get_map(mpp->alias, &mpp->size, params);
condlog(3, "params = %s", params);
dm_get_status(mpp->alias, status);
@@ -491,10 +485,11 @@ static int print_cmd_valid(int k, const vector pathvec,
struct timespec until;
struct path *pp;
- if (k != RTVL_YES && k != RTVL_NO && k != RTVL_MAYBE)
- return RTVL_NO;
+ if (k != PATH_IS_VALID && k != PATH_IS_NOT_VALID &&
+ k != PATH_IS_MAYBE_VALID)
+ return PATH_IS_NOT_VALID;
- if (k == RTVL_MAYBE) {
+ if (k == PATH_IS_MAYBE_VALID) {
/*
* Caller ensures that pathvec[0] is the path to
* examine.
@@ -504,7 +499,7 @@ static int print_cmd_valid(int k, const vector pathvec,
wait = find_multipaths_check_timeout(
pp, pp->find_multipaths_timeout, &until);
if (wait != FIND_MULTIPATHS_WAITING)
- k = RTVL_NO;
+ k = PATH_IS_NOT_VALID;
} else if (pathvec != NULL && (pp = VECTOR_SLOT(pathvec, 0)))
wait = find_multipaths_check_timeout(pp, 0, &until);
if (wait == FIND_MULTIPATHS_WAITING)
@@ -513,9 +508,9 @@ static int print_cmd_valid(int k, const vector pathvec,
else if (wait == FIND_MULTIPATHS_WAIT_DONE)
printf("FIND_MULTIPATHS_WAIT_UNTIL=\"0\"\n");
printf("DM_MULTIPATH_DEVICE_PATH=\"%d\"\n",
- k == RTVL_MAYBE ? 2 : k == RTVL_YES ? 1 : 0);
+ k == PATH_IS_MAYBE_VALID ? 2 : k == PATH_IS_VALID ? 1 : 0);
/* Never return RTVL_MAYBE */
- return k == RTVL_NO ? RTVL_NO : RTVL_YES;
+ return k == PATH_IS_NOT_VALID ? PATH_IS_NOT_VALID : PATH_IS_VALID;
}
/*
@@ -548,7 +543,6 @@ configure (struct config *conf, enum mpath_cmds cmd,
int di_flag = 0;
char * refwwid = NULL;
char * dev = NULL;
- bool released = released_to_systemd();
/*
* allocate core vectors to store paths and multipaths
@@ -573,7 +567,7 @@ configure (struct config *conf, enum mpath_cmds cmd,
cmd != CMD_REMOVE_WWID &&
(filter_devnode(conf->blist_devnode,
conf->elist_devnode, dev) > 0)) {
- goto print_valid;
+ goto out;
}
/*
@@ -581,14 +575,10 @@ configure (struct config *conf, enum mpath_cmds cmd,
* failing the translation is fatal (by policy)
*/
if (devpath) {
- int failed = get_refwwid(cmd, devpath, dev_type,
- pathvec, &refwwid);
+ get_refwwid(cmd, devpath, dev_type, pathvec, &refwwid);
if (!refwwid) {
condlog(4, "%s: failed to get wwid", devpath);
- if (failed == 2 && cmd == CMD_VALID_PATH)
- goto print_valid;
- else
- condlog(3, "scope is null");
+ condlog(3, "scope is null");
goto out;
}
if (cmd == CMD_REMOVE_WWID) {
@@ -614,53 +604,6 @@ configure (struct config *conf, enum mpath_cmds cmd,
goto out;
}
condlog(3, "scope limited to %s", refwwid);
- /* If you are ignoring the wwids file and find_multipaths is
- * set, you need to actually check if there are two available
- * paths to determine if this path should be multipathed. To
- * do this, we put off the check until after discovering all
- * the paths.
- * Paths listed in the wwids file are always considered valid.
- */
- if (cmd == CMD_VALID_PATH) {
- if (is_failed_wwid(refwwid) == WWID_IS_FAILED) {
- r = RTVL_NO;
- goto print_valid;
- }
- if ((!find_multipaths_on(conf) &&
- ignore_wwids_on(conf)) ||
- check_wwids_file(refwwid, 0) == 0)
- r = RTVL_YES;
- if (!ignore_wwids_on(conf))
- goto print_valid;
- /* At this point, either r==0 or find_multipaths_on. */
-
- /*
- * Shortcut for find_multipaths smart:
- * Quick check if path is already multipathed.
- */
- if (sysfs_is_multipathed(VECTOR_SLOT(pathvec, 0),
- false)) {
- r = RTVL_YES;
- goto print_valid;
- }
-
- /*
- * DM_MULTIPATH_DEVICE_PATH=="0" means that we have
- * been called for this device already, and have
- * released it to systemd. Unless the device is now
- * already multipathed (see above), we can't try to
- * grab it, because setting SYSTEMD_READY=0 would
- * cause file systems to be unmounted.
- * Leave DM_MULTIPATH_DEVICE_PATH="0".
- */
- if (released) {
- r = RTVL_NO;
- goto print_valid;
- }
- if (r == RTVL_YES)
- goto print_valid;
- /* find_multipaths_on: Fall through to path detection */
- }
}
/*
@@ -701,59 +644,6 @@ configure (struct config *conf, enum mpath_cmds cmd,
goto out;
}
- if (cmd == CMD_VALID_PATH) {
- struct path *pp;
- int fd;
-
- /* This only happens if find_multipaths and
- * ignore_wwids is set, and the path is not in WWIDs
- * file, not currently multipathed, and has
- * never been released to systemd.
- * If there is currently a multipath device matching
- * the refwwid, or there is more than one path matching
- * the refwwid, then the path is valid */
- if (VECTOR_SIZE(curmp) != 0) {
- r = RTVL_YES;
- goto print_valid;
- } else if (VECTOR_SIZE(pathvec) > 1)
- r = RTVL_YES;
- else
- r = RTVL_MAYBE;
-
- /*
- * If opening the path with O_EXCL fails, the path
- * is in use (e.g. mounted during initramfs processing).
- * We know that it's not used by dm-multipath.
- * We may not set SYSTEMD_READY=0 on such devices, it
- * might cause systemd to umount the device.
- * Use O_RDONLY, because udevd would trigger another
- * uevent for close-after-write.
- *
- * The O_EXCL check is potentially dangerous, because it may
- * race with other tasks trying to access the device. Therefore
- * this code is only executed if the path hasn't been released
- * to systemd earlier (see above).
- *
- * get_refwwid() above stores the path we examine in slot 0.
- */
- pp = VECTOR_SLOT(pathvec, 0);
- fd = open(udev_device_get_devnode(pp->udev),
- O_RDONLY|O_EXCL);
- if (fd >= 0)
- close(fd);
- else {
- condlog(3, "%s: path %s is in use: %s",
- __func__, pp->dev,
- strerror(errno));
- /*
- * Check if we raced with multipathd
- */
- r = sysfs_is_multipathed(VECTOR_SLOT(pathvec, 0),
- false) ? RTVL_YES : RTVL_NO;
- }
- goto print_valid;
- }
-
if (cmd != CMD_CREATE && cmd != CMD_DRY_RUN) {
r = RTVL_OK;
goto out;
@@ -766,10 +656,6 @@ configure (struct config *conf, enum mpath_cmds cmd,
conf->force_reload, cmd);
r = rc == CP_RETRY ? RTVL_RETRY : rc == CP_OK ? RTVL_OK : RTVL_FAIL;
-print_valid:
- if (cmd == CMD_VALID_PATH)
- r = print_cmd_valid(r, pathvec, conf);
-
out:
if (refwwid)
FREE(refwwid);
@@ -780,6 +666,112 @@ out:
return r;
}
+static int
+check_path_valid(const char *name, struct config *conf, bool is_uevent)
+{
+ int fd, r = PATH_IS_ERROR;
+ struct path *pp = NULL;
+ vector pathvec = NULL;
+
+ pp = alloc_path();
+ if (!pp)
+ return RTVL_FAIL;
+
+ r = is_path_valid(name, conf, pp, is_uevent);
+ if (r <= PATH_IS_ERROR || r >= PATH_MAX_VALID_RESULT)
+ goto fail;
+
+ /* set path values if is_path_valid() didn't */
+ if (!pp->udev)
+ pp->udev = udev_device_new_from_subsystem_sysname(udev, "block",
+ name);
+ if (!pp->udev)
+ goto fail;
+
+ if (!strlen(pp->dev_t)) {
+ dev_t devt = udev_device_get_devnum(pp->udev);
+ if (major(devt) == 0 && minor(devt) == 0)
+ goto fail;
+ snprintf(pp->dev_t, BLK_DEV_SIZE, "%d:%d", major(devt),
+ minor(devt));
+ }
+
+ pathvec = vector_alloc();
+ if (!pathvec)
+ goto fail;
+
+ if (store_path(pathvec, pp) != 0) {
+ free_path(pp);
+ goto fail;
+ }
+
+ if ((r == PATH_IS_VALID || r == PATH_IS_MAYBE_VALID) &&
+ released_to_systemd())
+ r = PATH_IS_NOT_VALID;
+
+ /* This state is only used to skip the released_to_systemd() check */
+ if (r == PATH_IS_VALID_NO_CHECK)
+ r = PATH_IS_VALID;
+
+ if (r != PATH_IS_MAYBE_VALID)
+ goto out;
+
+ /*
+ * If opening the path with O_EXCL fails, the path
+ * is in use (e.g. mounted during initramfs processing).
+ * We know that it's not used by dm-multipath.
+ * We may not set SYSTEMD_READY=0 on such devices, it
+ * might cause systemd to umount the device.
+ * Use O_RDONLY, because udevd would trigger another
+ * uevent for close-after-write.
+ *
+ * The O_EXCL check is potentially dangerous, because it may
+ * race with other tasks trying to access the device. Therefore
+ * this code is only executed if the path hasn't been released
+ * to systemd earlier (see above).
+ */
+ fd = open(udev_device_get_devnode(pp->udev), O_RDONLY|O_EXCL);
+ if (fd >= 0)
+ close(fd);
+ else {
+ condlog(3, "%s: path %s is in use: %m", __func__, pp->dev);
+ /* Check if we raced with multipathd */
+ if (sysfs_is_multipathed(pp, false))
+ r = PATH_IS_VALID;
+ else
+ r = PATH_IS_NOT_VALID;
+ goto out;
+ }
+
+ /* For find_multipaths = SMART, if there is more than one path
+ * matching the refwwid, then the path is valid */
+ if (path_discovery(pathvec, DI_SYSFS | DI_WWID) < 0)
+ goto fail;
+ filter_pathvec(pathvec, pp->wwid);
+ if (VECTOR_SIZE(pathvec) > 1)
+ r = PATH_IS_VALID;
+ else
+ r = PATH_IS_MAYBE_VALID;
+
+out:
+ r = print_cmd_valid(r, pathvec, conf);
+ free_pathvec(pathvec, FREE_PATHS);
+ /*
+ * multipath -u must exit with status 0, otherwise udev won't
+ * import its output.
+ */
+ if (!is_uevent && r == PATH_IS_NOT_VALID)
+ return RTVL_FAIL;
+ return RTVL_OK;
+
+fail:
+ if (pathvec)
+ free_pathvec(pathvec, FREE_PATHS);
+ else
+ free_path(pp);
+ return RTVL_FAIL;
+}
+
static int
get_dev_type(char *dev) {
struct stat buf;
@@ -861,32 +853,6 @@ out:
return r;
}
-static int test_multipathd_socket(void)
-{
- int fd;
- /*
- * "multipath -u" may be run before the daemon is started. In this
- * case, systemd might own the socket but might delay multipathd
- * startup until some other unit (udev settle!) has finished
- * starting. With many LUNs, the listen backlog may be exceeded, which
- * would cause connect() to block. This causes udev workers calling
- * "multipath -u" to hang, and thus creates a deadlock, until "udev
- * settle" times out. To avoid this, call connect() in non-blocking
- * mode here, and take EAGAIN as indication for a filled-up systemd
- * backlog.
- */
-
- fd = __mpath_connect(1);
- if (fd == -1) {
- if (errno == EAGAIN)
- condlog(3, "daemon backlog exceeded");
- else
- return 0;
- } else
- close(fd);
- return 1;
-}
-
int
main (int argc, char *argv[])
{
@@ -970,7 +936,11 @@ main (int argc, char *argv[])
conf->force_reload = FORCE_RELOAD_YES;
break;
case 'i':
- conf->find_multipaths |= _FIND_MULTIPATHS_I;
+ if (conf->find_multipaths == FIND_MULTIPATHS_ON ||
+ conf->find_multipaths == FIND_MULTIPATHS_STRICT)
+ conf->find_multipaths = FIND_MULTIPATHS_SMART;
+ else if (conf->find_multipaths == FIND_MULTIPATHS_OFF)
+ conf->find_multipaths = FIND_MULTIPATHS_GREEDY;
break;
case 't':
r = dump_config(conf, NULL, NULL) ? RTVL_FAIL : RTVL_OK;
@@ -1064,15 +1034,10 @@ main (int argc, char *argv[])
condlog(0, "the -c option requires a path to check");
goto out;
}
- if (cmd == CMD_VALID_PATH &&
- dev_type == DEV_UEVENT) {
- if (!test_multipathd_socket()) {
- condlog(3, "%s: daemon is not running", dev);
- if (!systemd_service_enabled(dev)) {
- r = print_cmd_valid(RTVL_NO, NULL, conf);
- goto out;
- }
- }
+ if (cmd == CMD_VALID_PATH) {
+ char * name = convert_dev(dev, (dev_type == DEV_DEVNODE));
+ r = check_path_valid(name, conf, dev_type == DEV_UEVENT);
+ goto out;
}
if (cmd == CMD_REMOVE_WWID && !dev) {
@@ -1136,13 +1101,6 @@ out:
cleanup_prio();
cleanup_checkers();
- /*
- * multipath -u must exit with status 0, otherwise udev won't
- * import its output.
- */
- if (cmd == CMD_VALID_PATH && dev_type == DEV_UEVENT && r == RTVL_NO)
- r = RTVL_OK;
-
if (dev_type == DEV_UEVENT)
closelog();
--
2.17.2
Reference in New Issue Copy Permalink