278 lines
9.3 KiB
Diff
278 lines
9.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Mon, 25 Jan 2021 23:31:04 -0600
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Subject: [PATCH] libmpathpersist: fix thread safety of default functions
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commit a839e39e ("libmpathpersist: factor out initialization and
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teardown") made mpath_presistent_reserve_{in,out} use share variables
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for curmp and pathvec. There are users of this library that call these
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functions in a multi-threaded process, and this change causes their
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application to crash. config and udev are also shared variables, but
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libmpathpersist doesn't write to the config in
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mpath_presistent_reserve_{in,out}, and looking into the libudev code, I
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don't see any place where libmpathpersist uses the udev object in a way
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that isn't thread-safe.
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This patch makes mpath_presistent_reserve_{in,out} go back to using
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local variables for curmp and pathvec, so that multiple threads won't
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be operating on these variables at the same time.
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Fixes: a839e39e ("libmpathpersist: factor out initialization and teardown")
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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Reviewed-by: Martin Wilck <mwilck@suse.com>
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---
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libmpathpersist/mpath_persist.c | 116 +++++++++++++++++++++-----------
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libmpathpersist/mpath_persist.h | 24 +++++--
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2 files changed, 94 insertions(+), 46 deletions(-)
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diff --git a/libmpathpersist/mpath_persist.c b/libmpathpersist/mpath_persist.c
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index a01dfb0b..07a5f17f 100644
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--- a/libmpathpersist/mpath_persist.c
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+++ b/libmpathpersist/mpath_persist.c
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@@ -147,72 +147,60 @@ mpath_prin_activepath (struct multipath *mpp, int rq_servact,
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return ret;
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}
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-int mpath_persistent_reserve_in (int fd, int rq_servact,
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- struct prin_resp *resp, int noisy, int verbose)
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-{
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- int ret = mpath_persistent_reserve_init_vecs(verbose);
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-
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- if (ret != MPATH_PR_SUCCESS)
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- return ret;
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- ret = __mpath_persistent_reserve_in(fd, rq_servact, resp, noisy);
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- mpath_persistent_reserve_free_vecs();
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- return ret;
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-}
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-
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-int mpath_persistent_reserve_out ( int fd, int rq_servact, int rq_scope,
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- unsigned int rq_type, struct prout_param_descriptor *paramp, int noisy, int verbose)
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-{
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- int ret = mpath_persistent_reserve_init_vecs(verbose);
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-
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- if (ret != MPATH_PR_SUCCESS)
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- return ret;
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- ret = __mpath_persistent_reserve_out(fd, rq_servact, rq_scope, rq_type,
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- paramp, noisy);
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- mpath_persistent_reserve_free_vecs();
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- return ret;
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-}
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-
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static vector curmp;
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static vector pathvec;
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-void mpath_persistent_reserve_free_vecs(void)
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+static void __mpath_persistent_reserve_free_vecs(vector curmp, vector pathvec)
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{
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free_multipathvec(curmp, KEEP_PATHS);
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free_pathvec(pathvec, FREE_PATHS);
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+}
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+
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+void mpath_persistent_reserve_free_vecs(void)
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+{
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+ __mpath_persistent_reserve_free_vecs(curmp, pathvec);
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curmp = pathvec = NULL;
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}
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-int mpath_persistent_reserve_init_vecs(int verbose)
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+static int __mpath_persistent_reserve_init_vecs(vector *curmp_p,
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+ vector *pathvec_p, int verbose)
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{
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struct config *conf = get_multipath_config();
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conf->verbosity = verbose;
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put_multipath_config(conf);
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- if (curmp)
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+ if (*curmp_p)
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return MPATH_PR_SUCCESS;
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/*
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* allocate core vectors to store paths and multipaths
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*/
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- curmp = vector_alloc ();
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- pathvec = vector_alloc ();
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+ *curmp_p = vector_alloc ();
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+ *pathvec_p = vector_alloc ();
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- if (!curmp || !pathvec){
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+ if (!*curmp_p || !*pathvec_p){
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condlog (0, "vector allocation failed.");
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goto err;
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}
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- if (dm_get_maps(curmp))
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+ if (dm_get_maps(*curmp_p))
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goto err;
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return MPATH_PR_SUCCESS;
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err:
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- mpath_persistent_reserve_free_vecs();
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+ __mpath_persistent_reserve_free_vecs(*curmp_p, *pathvec_p);
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+ *curmp_p = *pathvec_p = NULL;
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return MPATH_PR_DMMP_ERROR;
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}
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-static int mpath_get_map(int fd, char **palias, struct multipath **pmpp)
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+int mpath_persistent_reserve_init_vecs(int verbose)
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+{
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+ return __mpath_persistent_reserve_init_vecs(&curmp, &pathvec, verbose);
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+}
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+
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+static int mpath_get_map(vector curmp, vector pathvec, int fd, char **palias,
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+ struct multipath **pmpp)
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{
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int ret = MPATH_PR_DMMP_ERROR;
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struct stat info;
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@@ -272,13 +260,13 @@ out:
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return ret;
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}
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-int __mpath_persistent_reserve_in (int fd, int rq_servact,
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- struct prin_resp *resp, int noisy)
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+static int do_mpath_persistent_reserve_in (vector curmp, vector pathvec,
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+ int fd, int rq_servact, struct prin_resp *resp, int noisy)
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{
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struct multipath *mpp;
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int ret;
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- ret = mpath_get_map(fd, NULL, &mpp);
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+ ret = mpath_get_map(curmp, pathvec, fd, NULL, &mpp);
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if (ret != MPATH_PR_SUCCESS)
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return ret;
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@@ -287,8 +275,17 @@ int __mpath_persistent_reserve_in (int fd, int rq_servact,
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return ret;
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}
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-int __mpath_persistent_reserve_out ( int fd, int rq_servact, int rq_scope,
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- unsigned int rq_type, struct prout_param_descriptor *paramp, int noisy)
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+
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+int __mpath_persistent_reserve_in (int fd, int rq_servact,
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+ struct prin_resp *resp, int noisy)
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+{
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+ return do_mpath_persistent_reserve_in(curmp, pathvec, fd, rq_servact,
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+ resp, noisy);
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+}
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+
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+static int do_mpath_persistent_reserve_out(vector curmp, vector pathvec, int fd,
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+ int rq_servact, int rq_scope, unsigned int rq_type,
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+ struct prout_param_descriptor *paramp, int noisy)
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{
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struct multipath *mpp;
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char *alias;
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@@ -296,7 +293,7 @@ int __mpath_persistent_reserve_out ( int fd, int rq_servact, int rq_scope,
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uint64_t prkey;
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struct config *conf;
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- ret = mpath_get_map(fd, &alias, &mpp);
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+ ret = mpath_get_map(curmp, pathvec, fd, &alias, &mpp);
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if (ret != MPATH_PR_SUCCESS)
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return ret;
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@@ -366,6 +363,45 @@ out1:
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return ret;
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}
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+
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+int __mpath_persistent_reserve_out ( int fd, int rq_servact, int rq_scope,
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+ unsigned int rq_type, struct prout_param_descriptor *paramp, int noisy)
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+{
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+ return do_mpath_persistent_reserve_out(curmp, pathvec, fd, rq_servact,
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+ rq_scope, rq_type, paramp,
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+ noisy);
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+}
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+
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+int mpath_persistent_reserve_in (int fd, int rq_servact,
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+ struct prin_resp *resp, int noisy, int verbose)
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+{
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+ vector curmp = NULL, pathvec;
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+ int ret = __mpath_persistent_reserve_init_vecs(&curmp, &pathvec,
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+ verbose);
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+
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+ if (ret != MPATH_PR_SUCCESS)
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+ return ret;
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+ ret = do_mpath_persistent_reserve_in(curmp, pathvec, fd, rq_servact,
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+ resp, noisy);
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+ __mpath_persistent_reserve_free_vecs(curmp, pathvec);
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+ return ret;
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+}
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+
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+int mpath_persistent_reserve_out ( int fd, int rq_servact, int rq_scope,
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+ unsigned int rq_type, struct prout_param_descriptor *paramp, int noisy, int verbose)
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+{
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+ vector curmp = NULL, pathvec;
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+ int ret = __mpath_persistent_reserve_init_vecs(&curmp, &pathvec,
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+ verbose);
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+
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+ if (ret != MPATH_PR_SUCCESS)
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+ return ret;
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+ ret = do_mpath_persistent_reserve_out(curmp, pathvec, fd, rq_servact,
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+ rq_scope, rq_type, paramp, noisy);
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+ __mpath_persistent_reserve_free_vecs(curmp, pathvec);
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+ return ret;
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+}
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+
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int
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get_mpvec (vector curmp, vector pathvec, char * refwwid)
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{
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diff --git a/libmpathpersist/mpath_persist.h b/libmpathpersist/mpath_persist.h
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index 7cf4faf9..0e4e0e53 100644
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--- a/libmpathpersist/mpath_persist.h
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+++ b/libmpathpersist/mpath_persist.h
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@@ -215,9 +215,13 @@ extern int mpath_persistent_reserve_in (int fd, int rq_servact, struct prin_resp
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/*
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* DESCRIPTION :
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- * This function is like mpath_persistent_reserve_in(), except that it doesn't call
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- * mpath_persistent_reserve_init_vecs() and mpath_persistent_reserve_free_vecs()
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- * before and after the actual PR call.
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+ * This function is like mpath_persistent_reserve_in(), except that it
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+ * requires mpath_persistent_reserve_init_vecs() to be called before the
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+ * PR call to set up internal variables. These must later be cleanup up
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+ * by calling mpath_persistent_reserve_free_vecs().
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+ *
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+ * RESTRICTIONS:
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+ * This function uses static internal variables, and is not thread-safe.
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*/
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extern int __mpath_persistent_reserve_in(int fd, int rq_servact,
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struct prin_resp *resp, int noisy);
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@@ -249,9 +253,13 @@ extern int mpath_persistent_reserve_out ( int fd, int rq_servact, int rq_scope,
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int verbose);
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/*
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* DESCRIPTION :
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- * This function is like mpath_persistent_reserve_out(), except that it doesn't call
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- * mpath_persistent_reserve_init_vecs() and mpath_persistent_reserve_free_vecs()
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- * before and after the actual PR call.
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+ * This function is like mpath_persistent_reserve_out(), except that it
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+ * requires mpath_persistent_reserve_init_vecs() to be called before the
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+ * PR call to set up internal variables. These must later be cleanup up
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+ * by calling mpath_persistent_reserve_free_vecs().
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+ *
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+ * RESTRICTIONS:
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+ * This function uses static internal variables, and is not thread-safe.
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*/
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extern int __mpath_persistent_reserve_out( int fd, int rq_servact, int rq_scope,
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unsigned int rq_type, struct prout_param_descriptor *paramp,
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@@ -265,6 +273,7 @@ extern int __mpath_persistent_reserve_out( int fd, int rq_servact, int rq_scope,
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* @verbose: Set verbosity level. Input argument. value:0 to 3. 0->disabled, 3->Max verbose
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*
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* RESTRICTIONS:
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+ * This function uses static internal variables, and is not thread-safe.
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*
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* RETURNS: MPATH_PR_SUCCESS if successful else returns any of the status specified
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* above in RETURN_STATUS.
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@@ -275,6 +284,9 @@ int mpath_persistent_reserve_init_vecs(int verbose);
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* DESCRIPTION :
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* This function frees data structures allocated by
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* mpath_persistent_reserve_init_vecs().
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+ *
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+ * RESTRICTIONS:
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+ * This function uses static internal variables, and is not thread-safe.
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*/
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void mpath_persistent_reserve_free_vecs(void);
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--
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2.17.2
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