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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 06-02-2008, 08:52 AM
 
Default Allow zero paths for multipath map

There is no reason why multipath should handle the removal
of the last path from a multipath map different than any other
path removal. In fact, in doing so we'll shed the stale reference
to the dead device in the map and allow for a clean reconnection.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
libmultipath/configure.c | 6 +-
libmultipath/dmparser.c | 15 +++-
libmultipath/pgpolicies.c | 5 ++
libmultipath/structs.c | 22 +++++--
libmultipath/structs.h | 1 +
libmultipath/structs_vec.c | 16 +++--
multipathd/main.c | 158 ++++++++++++++++++++------------------------
7 files changed, 119 insertions(+), 104 deletions(-)

diff --git a/libmultipath/configure.c b/libmultipath/configure.c
index ad76832..13897e2 100644
--- a/libmultipath/configure.c
+++ b/libmultipath/configure.c
@@ -189,14 +189,14 @@ select_action (struct multipath * mpp, vector curmp, int force_reload)
mpp->alias);
return;
}
- if (strncmp(cmpp->hwhandler, mpp->hwhandler,
+ if (!cmpp->selector || strncmp(cmpp->hwhandler, mpp->hwhandler,
strlen(mpp->hwhandler))) {
mpp->action = ACT_RELOAD;
condlog(3, "%s: set ACT_RELOAD (hwhandler change)",
mpp->alias);
return;
}
- if (strncmp(cmpp->selector, mpp->selector,
+ if (!cmpp->selector || strncmp(cmpp->selector, mpp->selector,
strlen(mpp->selector))) {
mpp->action = ACT_RELOAD;
condlog(3, "%s: set ACT_RELOAD (selector change)",
@@ -209,7 +209,7 @@ select_action (struct multipath * mpp, vector curmp, int force_reload)
mpp->alias, cmpp->minio, mpp->minio);
return;
}
- if (VECTOR_SIZE(cmpp->pg) != VECTOR_SIZE(mpp->pg)) {
+ if (!cmpp->pg || VECTOR_SIZE(cmpp->pg) != VECTOR_SIZE(mpp->pg)) {
mpp->action = ACT_RELOAD;
condlog(3, "%s: set ACT_RELOAD (path group number change)",
mpp->alias);
diff --git a/libmultipath/dmparser.c b/libmultipath/dmparser.c
index df7a0c3..bc3f231 100644
--- a/libmultipath/dmparser.c
+++ b/libmultipath/dmparser.c
@@ -145,6 +145,8 @@ disassemble_map (vector pathvec, char * params, struct multipath * mpp)
FREE(word);
return 1;
}
+ setup_feature(mpp, word);
+
FREE(word);
}

@@ -182,11 +184,12 @@ disassemble_map (vector pathvec, char * params, struct multipath * mpp)
num_pg = atoi(word);
FREE(word);

- if (num_pg > 0 && !mpp->pg)
+ if (num_pg > 0 && !mpp->pg) {
mpp->pg = vector_alloc();
-
- if (!mpp->pg)
- return 1;
+ if (!mpp->pg)
+ return 1;
+ }
+
/*
* first pg to try
*/
@@ -327,6 +330,7 @@ out1:
FREE(word);
out:
free_pgvec(mpp->pg, KEEP_PATHS);
+ mpp->pg = NULL;
return 1;
}

@@ -396,6 +400,9 @@ disassemble_status (char * params, struct multipath * mpp)
num_pg = atoi(word);
FREE(word);

+ if (num_pg == 0)
+ return 0;
+
/*
* next pg to try
*/
diff --git a/libmultipath/pgpolicies.c b/libmultipath/pgpolicies.c
index 1a355af..2a9671a 100644
--- a/libmultipath/pgpolicies.c
+++ b/libmultipath/pgpolicies.c
@@ -126,6 +126,7 @@ out1:
FREE(bitmap);
out:
free_pgvec(mp->pg, KEEP_PATHS);
+ mp->pg = NULL;
return 1;
}

@@ -197,6 +198,7 @@ out1:
FREE(bitmap);
out:
free_pgvec(mp->pg, KEEP_PATHS);
+ mp->pg = NULL;
return 1;
}

@@ -231,6 +233,7 @@ one_path_per_group (struct multipath * mp)
return 0;
out:
free_pgvec(mp->pg, KEEP_PATHS);
+ mp->pg = NULL;
return 1;
}

@@ -263,6 +266,7 @@ one_group (struct multipath * mp) /* aka multibus */
return 0;
out:
free_pgvec(mp->pg, KEEP_PATHS);
+ mp->pg = NULL;
return 1;
}

@@ -337,6 +341,7 @@ group_by_prio (struct multipath * mp)
return 0;
out:
free_pgvec(mp->pg, KEEP_PATHS);
+ mp->pg = NULL;
return 1;

}
diff --git a/libmultipath/structs.c b/libmultipath/structs.c
index 082d53f..852e6b3 100644
--- a/libmultipath/structs.c
+++ b/libmultipath/structs.c
@@ -362,15 +362,27 @@ pathcount (struct multipath * mpp, int state)
int count = 0;
int i;

- vector_foreach_slot (mpp->pg, pgp, i)
- count += pathcountgr(pgp, state);
-
+ if (mpp->pg) {
+ vector_foreach_slot (mpp->pg, pgp, i)
+ count += pathcountgr(pgp, state);
+ }
return count;
}

struct path *
first_path (struct multipath * mpp)
{
- struct pathgroup * pgp = VECTOR_SLOT(mpp->pg, 0);
- return VECTOR_SLOT(pgp->paths, 0);
+ struct pathgroup * pgp;
+ if (!mpp->pg)
+ return NULL;
+ pgp = VECTOR_SLOT(mpp->pg, 0);
+
+ return pgp?VECTOR_SLOT(pgp->paths, 0):NULL;
+}
+
+extern void
+setup_feature(struct multipath * mpp, char *feature)
+{
+ if (!strncmp(feature, "queue_if_no_path", 16))
+ mpp->no_path_retry = NO_PATH_RETRY_QUEUE;
}
diff --git a/libmultipath/structs.h b/libmultipath/structs.h
index 2517782..85d5109 100644
--- a/libmultipath/structs.h
+++ b/libmultipath/structs.h
@@ -211,6 +211,7 @@ struct path * first_path (struct multipath * mpp);

int pathcountgr (struct pathgroup *, int);
int pathcount (struct multipath *, int);
+void setup_feature(struct multipath *, char *);

extern char sysfs_path[PATH_SIZE];

diff --git a/libmultipath/structs_vec.c b/libmultipath/structs_vec.c
index 6757eb9..3bb79cd 100644
--- a/libmultipath/structs_vec.c
+++ b/libmultipath/structs_vec.c
@@ -187,13 +187,16 @@ remove_maps_and_stop_waiters (struct vectors * vecs)
static struct hwentry *
extract_hwe_from_path(struct multipath * mpp)
{
- struct path * pp;
- struct pathgroup * pgp;
+ struct path * pp = NULL;
+ struct pathgroup * pgp = NULL;
+
+ if (mpp && mpp->pg)
+ pgp = VECTOR_SLOT(mpp->pg, 0);

- pgp = VECTOR_SLOT(mpp->pg, 0);
- pp = VECTOR_SLOT(pgp->paths, 0);
+ if (pgp && pgp->paths)
+ pp = VECTOR_SLOT(pgp->paths, 0);

- return pp->hwe;
+ return pp?pp->hwe:NULL;
}

static int
@@ -247,7 +250,8 @@ set_no_path_retry(struct multipath *mpp)
{
mpp->retry_tick = 0;
mpp->nr_active = pathcount(mpp, PATH_UP) + pathcount(mpp, PATH_GHOST);
- select_no_path_retry(mpp);
+ if (mpp->nr_active > 0)
+ select_no_path_retry(mpp);

switch (mpp->no_path_retry) {
case NO_PATH_RETRY_UNDEF:
diff --git a/multipathd/main.c b/multipathd/main.c
index 8c752d2..f68dc41 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -140,7 +140,7 @@ coalesce_maps(struct vectors *vecs, vector nmpv)
}
else {
dm_lib_release();
- condlog(3, "%s devmap removed", ompp->alias);
+ condlog(2, "%s devmap removed", ompp->alias);
}
}
}
@@ -154,6 +154,9 @@ sync_map_state(struct multipath *mpp)
struct path *pp;
unsigned int i, j;

+ if (!mpp->pg)
+ return;
+
vector_foreach_slot (mpp->pg, pgp, i){
vector_foreach_slot (pgp->paths, pp, j){
if (pp->state <= PATH_UNCHECKED)
@@ -198,7 +201,7 @@ flush_map(struct multipath * mpp, struct vectors * vecs)
}
else {
dm_lib_release();
- condlog(3, "%s: devmap removed", mpp->alias);
+ condlog(2, "%s: devmap removed", mpp->alias);
}

orphan_paths(vecs->pathvec, mpp);
@@ -260,7 +263,7 @@ ev_add_map (struct sysfs_device * dev, struct vectors * vecs)
*/
if (map_present && (mpp = add_map_without_path(vecs, minor, alias))) {
sync_map_state(mpp);
- condlog(3, "%s: devmap %s added", alias, dev->kernel);
+ condlog(2, "%s: devmap %s added", alias, dev->kernel);
return 0;
}
refwwid = get_refwwid(dev->kernel, DEV_DEVMAP, vecs->pathvec);
@@ -271,7 +274,7 @@ ev_add_map (struct sysfs_device * dev, struct vectors * vecs)
}

if (!r)
- condlog(3, "%s: devmap %s added", alias, dev->kernel);
+ condlog(2, "%s: devmap %s added", alias, dev->kernel);
else
condlog(0, "%s: uev_add_map %s failed", alias, dev->kernel);

@@ -294,7 +297,7 @@ ev_remove_map (char * devname, struct vectors * vecs)
mpp = find_mp_by_str(vecs->mpvec, devname);

if (!mpp) {
- condlog(3, "%s: devmap not registered, can't remove",
+ condlog(2, "%s: devmap not registered, can't remove",
devname);
return 0;
}
@@ -435,7 +438,7 @@ rescan:
start_waiter_thread(mpp, vecs))
goto out;

- condlog(3, "%s path added to devmap %s", devname, mpp->alias);
+ condlog(2, "%s path added to devmap %s", devname, mpp->alias);
return 0;

out:
@@ -461,8 +464,7 @@ ev_remove_path (char * devname, struct vectors * vecs)
{
struct multipath * mpp;
struct path * pp;
- int i;
- int rm_path = 1;
+ int i, retval = 0;

pp = find_path_by_dev(vecs->pathvec, devname);

@@ -472,97 +474,78 @@ ev_remove_path (char * devname, struct vectors * vecs)
}

/*
- * avoid referring to the map of an orphanned path
+ * avoid referring to the map of an orphaned path
*/
if ((mpp = pp->mpp)) {
+ /*
+ * transform the mp->pg vector of vectors of paths
+ * into a mp->params string to feed the device-mapper
+ */
+ if (update_mpp_paths(mpp, vecs->pathvec)) {
+ condlog(0, "%s: failed to update paths",
+ mpp->alias);
+ goto out;
+ }
+ if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
+ vector_del_slot(mpp->paths, i);

/*
* remove the map IFF removing the last path
*/
- if (pathcount(mpp, PATH_WILD) > 1) {
- vector rpvec = vector_alloc();
+ if (VECTOR_SIZE(mpp->paths) == 0) {
+ char alias[WWID_SIZE];

/*
- * transform the mp->pg vector of vectors of paths
- * into a mp->params string to feed the device-mapper
+ * flush_map will fail if the device is open
*/
- update_mpp_paths(mpp, vecs->pathvec);
- if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
- vector_del_slot(mpp->paths, i);
-
- if (VECTOR_SIZE(mpp->paths) == 0) {
- char alias[WWID_SIZE];
-
- /*
- * flush_map will fail if the device is open
- */
- strncpy(alias, mpp->alias, WWID_SIZE);
- if (flush_map(mpp, vecs))
- rm_path = 0;
- else
- condlog(3, "%s: removed map after removing"
- " multiple paths", alias);
- }
- else {
- if (setup_map(mpp)) {
- condlog(0, "%s: failed to setup map for"
- " removal of path %s", mpp->alias, devname);
- free_pathvec(rpvec, KEEP_PATHS);
- goto out;
- }
- /*
- * reload the map
- */
- mpp->action = ACT_RELOAD;
- if (domap(mpp) <= 0) {
- condlog(0, "%s: failed in domap for "
- "removal of path %s",
- mpp->alias, devname);
- /*
- * Delete path from pathvec so that
- * update_mpp_paths wont find it later
- * when/if another path is removed.
- */
- if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
- vector_del_slot(vecs->pathvec, i);
- free_path(pp);
- return 1;
- }
- /*
- * update our state from kernel
- */
- if (setup_multipath(vecs, mpp)) {
- free_pathvec(rpvec, KEEP_PATHS);
- goto out;
- }
- sync_map_state(mpp);
-
- condlog(3, "%s: path removed from map %s",
- devname, mpp->alias);
+ strncpy(alias, mpp->alias, WWID_SIZE);
+ if (!flush_map(mpp, vecs)) {
+ condlog(2, "%s: removed map after"
+ " removing all paths",
+ alias);
+ free_path(pp);
+ return 0;
}
- free_pathvec(rpvec, KEEP_PATHS);
+ /*
+ * Not an error, continue
+ */
}
- else {
- char alias[WWID_SIZE];

+ if (setup_map(mpp)) {
+ condlog(0, "%s: failed to setup map for"
+ " removal of path %s", mpp->alias,
+ devname);
+ goto out;
+ }
+ /*
+ * reload the map
+ */
+ mpp->action = ACT_RELOAD;
+ if (domap(mpp) <= 0) {
+ condlog(0, "%s: failed in domap for "
+ "removal of path %s",
+ mpp->alias, devname);
+ retval = 1;
+ } else {
/*
- * flush_map will fail if the device is open
+ * update our state from kernel
*/
- strncpy(alias, mpp->alias, WWID_SIZE);
- if (flush_map(mpp, vecs))
- rm_path = 0;
- else
- condlog(3, "%s: removed map", alias);
+ if (setup_multipath(vecs, mpp)) {
+ goto out;
+ }
+ sync_map_state(mpp);
+
+ condlog(2, "%s: path removed from map %s",
+ devname, mpp->alias);
}
}

- if (rm_path) {
- if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
- vector_del_slot(vecs->pathvec, i);
- free_path(pp);
- }
+ if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
+ vector_del_slot(vecs->pathvec, i);

- return 0;
+ free_path(pp);
+
+ return retval;

out:
remove_map_and_stop_waiter(mpp, vecs, 1);
@@ -1023,12 +1006,15 @@ checkerloop (void *ap)
lock(vecs->lock);
condlog(4, "tick");

- vector_foreach_slot (vecs->pathvec, pp, i) {
- check_path(vecs, pp);
+ if (vecs->pathvec) {
+ vector_foreach_slot (vecs->pathvec, pp, i) {
+ check_path(vecs, pp);
+ }
+ }
+ if (vecs->mpvec) {
+ defered_failback_tick(vecs->mpvec);
+ retry_count_tick(vecs->mpvec);
}
- defered_failback_tick(vecs->mpvec);
- retry_count_tick(vecs->mpvec);
-
if (count)
count--;
else {
--
1.5.2.4

--
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