From patchwork Mon Dec 4 20:25:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anna Schumaker X-Patchwork-Id: 13479070 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1645D34196 for ; Mon, 4 Dec 2023 20:25:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PuIGeQI5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80386C433CA; Mon, 4 Dec 2023 20:25:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701721514; bh=mJmCrf2Zb6Hk+V9yJG0ZUTKvd7Dd7P+Chu6znTBgs6M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PuIGeQI5rr5iiJYBDqQx1rxTuc+wLk69yBFT3a6fvQQd+Wou7E3hYDHUsvEYw4A2/ nh5fg6EGRcnNvjLgpI4AyJDfJoDwSjXk72t4BepYuwI9coajuGYh5BYx1VytfM8GgU eD/UwCXmfnuFT3kBoLnJ4o0rrXXzN219MYHD0+fnStPTwn9WUG2SApSGdQkmPv/b3F kt2835E/6BenH+5uGFHofOWfb9+huiF0/hxeuF6vI94O377bOTU+1vShAePMmaOvst VKqPXxeNS6ZlQ3rvqu0WPmQGJpiwZvPXrb9MEwc7Gbp5d7x1Tx1l0G6H/hM1psH4ST unVg6LNRdouvg== From: Anna Schumaker To: linux-nfs@vger.kernel.org, trond.myklebust@hammerspace.com Cc: anna@kernel.org Subject: [PATCH v2 1/4] SUNRPC: Clean up unused variable in rpc_xprt_probe_trunked() Date: Mon, 4 Dec 2023 15:25:09 -0500 Message-ID: <20231204202512.108047-2-anna@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231204202512.108047-1-anna@kernel.org> References: <20231204202512.108047-1-anna@kernel.org> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Anna Schumaker We don't use the rpc_xprt_switch anywhere in this function, so let's not take an extra reference to in unnecessarily. Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker --- net/sunrpc/clnt.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index daa9582ec861..4aa838543f79 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -3116,7 +3116,6 @@ static int rpc_xprt_probe_trunked(struct rpc_clnt *clnt, struct rpc_xprt *xprt, struct rpc_add_xprt_test *data) { - struct rpc_xprt_switch *xps; struct rpc_xprt *main_xprt; int status = 0; @@ -3124,7 +3123,6 @@ static int rpc_xprt_probe_trunked(struct rpc_clnt *clnt, rcu_read_lock(); main_xprt = xprt_get(rcu_dereference(clnt->cl_xprt)); - xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); status = rpc_cmp_addr_port((struct sockaddr *)&xprt->addr, (struct sockaddr *)&main_xprt->addr); rcu_read_unlock(); @@ -3135,7 +3133,6 @@ static int rpc_xprt_probe_trunked(struct rpc_clnt *clnt, status = rpc_clnt_add_xprt_helper(clnt, xprt, data); out: xprt_put(xprt); - xprt_switch_put(xps); return status; } From patchwork Mon Dec 4 20:25:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anna Schumaker X-Patchwork-Id: 13479071 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE40934196 for ; Mon, 4 Dec 2023 20:25:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AHZPYj/B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C240C433C9; Mon, 4 Dec 2023 20:25:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701721515; bh=irUZhZ42IrQH8Et+sietGUtb3Ty5NSU38pZwwlDTXuo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AHZPYj/ByJ5DOaUTe8Zm5JIf5KhcycizIxYF44/iGOuyKy0HSlzqumhLnrupwithq 0j5uCkt+5vvZVOqYSIlXI6lmmdPLH3JZPxh5Xzeu4pEHON2uz0ttSXPgUuMv9R8e1E vm4dCxX/UjpvngapL9MMRK9V+oHCw2jZ4+XIykBoEtGTw5PG+r094Gk/JtvALpGuxQ gYhVJSE8rOAJwJY/aaO2/Lqw35olyefqVEwiPwqXKoZ6H3roTlUIaipZoGwWkO1qZv +apaGq4zgOYQDZNZhVpXBnCh32E0DfSeD8MbXOkZ+zjWI/kObQkMON/8uBCiWUl4ey c0M7q1eg2Ap5g== From: Anna Schumaker To: linux-nfs@vger.kernel.org, trond.myklebust@hammerspace.com Cc: anna@kernel.org Subject: [PATCH v2 2/4] SUNRPC: Remove unused function rpc_clnt_xprt_switch_put() Date: Mon, 4 Dec 2023 15:25:10 -0500 Message-ID: <20231204202512.108047-3-anna@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231204202512.108047-1-anna@kernel.org> References: <20231204202512.108047-1-anna@kernel.org> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Anna Schumaker Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker --- include/linux/sunrpc/clnt.h | 1 - net/sunrpc/clnt.c | 8 -------- 2 files changed, 9 deletions(-) diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h index e9d4377d03c6..5e9d1469c6fa 100644 --- a/include/linux/sunrpc/clnt.h +++ b/include/linux/sunrpc/clnt.h @@ -252,7 +252,6 @@ void rpc_clnt_probe_trunked_xprts(struct rpc_clnt *, const char *rpc_proc_name(const struct rpc_task *task); -void rpc_clnt_xprt_switch_put(struct rpc_clnt *); void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *); void rpc_clnt_xprt_switch_remove_xprt(struct rpc_clnt *, struct rpc_xprt *); bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt, diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 4aa838543f79..8df944444e9b 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -3247,14 +3247,6 @@ rpc_set_connect_timeout(struct rpc_clnt *clnt, } EXPORT_SYMBOL_GPL(rpc_set_connect_timeout); -void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt) -{ - rcu_read_lock(); - xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); - rcu_read_unlock(); -} -EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put); - void rpc_clnt_xprt_set_online(struct rpc_clnt *clnt, struct rpc_xprt *xprt) { struct rpc_xprt_switch *xps; From patchwork Mon Dec 4 20:25:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anna Schumaker X-Patchwork-Id: 13479072 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 62A9F35EE2 for ; Mon, 4 Dec 2023 20:25:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bJ56mFj1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D720BC433C8; Mon, 4 Dec 2023 20:25:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701721516; bh=1t1ghWKHxmd01vbjRyBgBLlT2J0AjWPGwDhH1W5KiVQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bJ56mFj1b9JfhTKKr54Piz873QFad0gIj9MlEmPcHDY6rFf3zJJwP4Pq+ypii0ZQU ElBF5V+c1GKym+QLZUARwrhKQe+cCrvrM5oCjte05PlwV/cK47c3c0fCdBEWLW19f3 F4jIOxq8T8oZn/VmTTfPttlwjHUi7X1xbYsAmKUF9cwVFMto3BiCLV5kgOAvcRls4g x7nF+7LPCKvChF6BuME0StsBrwjr3wYolf/zk5A985Em7m6HyiFiempk3706VDk46U cIQEywOosO6HRjN5h6eyetAfdtZAc/S/xUDdbQP+p8v22EFudi/boIQm6g2S7Skgsw pN395YfQw25pg== From: Anna Schumaker To: linux-nfs@vger.kernel.org, trond.myklebust@hammerspace.com Cc: anna@kernel.org Subject: [PATCH v2 3/4] SUNRPC: Create a helper function for accessing the rpc_clnt's xprt_switch Date: Mon, 4 Dec 2023 15:25:11 -0500 Message-ID: <20231204202512.108047-4-anna@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231204202512.108047-1-anna@kernel.org> References: <20231204202512.108047-1-anna@kernel.org> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Anna Schumaker This function takes the necessary rcu read lock to dereference the client's rpc_xprt_switch and bump the reference count so it doesn't disappear underneath us before returning. This does mean that callers are responsible for calling xprt_switch_put() on the returned object when they are done with it. Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker --- net/sunrpc/clnt.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 8df944444e9b..0b2c4b5484f5 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -797,15 +797,24 @@ int rpc_switch_client_transport(struct rpc_clnt *clnt, } EXPORT_SYMBOL_GPL(rpc_switch_client_transport); +static struct rpc_xprt_switch *rpc_clnt_xprt_switch_get(struct rpc_clnt *clnt) +{ + struct rpc_xprt_switch *xps; + + rcu_read_lock(); + xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); + rcu_read_unlock(); + + return xps; +} + static int _rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi, void func(struct rpc_xprt_iter *xpi, struct rpc_xprt_switch *xps)) { struct rpc_xprt_switch *xps; - rcu_read_lock(); - xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); - rcu_read_unlock(); + xps = rpc_clnt_xprt_switch_get(clnt); if (xps == NULL) return -EAGAIN; func(xpi, xps); @@ -2206,9 +2215,7 @@ call_connect_status(struct rpc_task *task) struct rpc_xprt *saved = task->tk_xprt; struct rpc_xprt_switch *xps; - rcu_read_lock(); - xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch)); - rcu_read_unlock(); + xps = rpc_clnt_xprt_switch_get(clnt); if (xps->xps_nxprts > 1) { long value; @@ -3251,22 +3258,23 @@ void rpc_clnt_xprt_set_online(struct rpc_clnt *clnt, struct rpc_xprt *xprt) { struct rpc_xprt_switch *xps; - rcu_read_lock(); - xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch); - rcu_read_unlock(); + xps = rpc_clnt_xprt_switch_get(clnt); xprt_set_online_locked(xprt, xps); + xprt_switch_put(xps); } void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt) { + struct rpc_xprt_switch *xps; + if (rpc_clnt_xprt_switch_has_addr(clnt, (const struct sockaddr *)&xprt->addr)) { return rpc_clnt_xprt_set_online(clnt, xprt); } - rcu_read_lock(); - rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch), - xprt); - rcu_read_unlock(); + + xps = rpc_clnt_xprt_switch_get(clnt); + rpc_xprt_switch_add_xprt(xps, xprt); + xprt_switch_put(xps); } EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt); From patchwork Mon Dec 4 20:25:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anna Schumaker X-Patchwork-Id: 13479073 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 382CB35EE2 for ; Mon, 4 Dec 2023 20:25:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CrA7zzKC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F8A8C433C7; Mon, 4 Dec 2023 20:25:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701721517; bh=1+uLgjUj8mo3vcDuc2K/87whBVPRhQL7CjQQXZ8wM/M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CrA7zzKCYDLJWMBtqXs2zAtvhPuyOlSGNkRkLlPjTTtXPCaK38LiLmbFU5H3MPpp6 C6wAostrl4ngClJaPDZO772blO+z9o88mYObou8ohDjfkKoKVZYB0Hvyec6H8K6Z+H yWgz6wHv0jr8oINz85vLK0T6Xkk9XOX6OauGXnAA064SActP7ElXjyeo72VKDCqkqw OG5oLfGBigpJ+lLvyDpLxYIoDBRb4DzR6j+RQaaPYvUoGx5KrkiRKSB8VKnvyS9ktJ qQvgGv4PmB00x9q+RLaCaJiiOKHjbmWchDHcXS9bVa7OOftD8JDt0AjClD36L/RXVY dYn7h7s78Yzmw== From: Anna Schumaker To: linux-nfs@vger.kernel.org, trond.myklebust@hammerspace.com Cc: anna@kernel.org Subject: [PATCH v2 4/4] SUNRPC: Fix a suspicious RCU usage warning Date: Mon, 4 Dec 2023 15:25:12 -0500 Message-ID: <20231204202512.108047-5-anna@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231204202512.108047-1-anna@kernel.org> References: <20231204202512.108047-1-anna@kernel.org> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Anna Schumaker I received the following warning while running cthon against an ontap server running pNFS: [ 57.202521] ============================= [ 57.202522] WARNING: suspicious RCU usage [ 57.202523] 6.7.0-rc3-g2cc14f52aeb7 #41492 Not tainted [ 57.202525] ----------------------------- [ 57.202525] net/sunrpc/xprtmultipath.c:349 RCU-list traversed in non-reader section!! [ 57.202527] other info that might help us debug this: [ 57.202528] rcu_scheduler_active = 2, debug_locks = 1 [ 57.202529] no locks held by test5/3567. [ 57.202530] stack backtrace: [ 57.202532] CPU: 0 PID: 3567 Comm: test5 Not tainted 6.7.0-rc3-g2cc14f52aeb7 #41492 5b09971b4965c0aceba19f3eea324a4a806e227e [ 57.202534] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 2/2/2022 [ 57.202536] Call Trace: [ 57.202537] [ 57.202540] dump_stack_lvl+0x77/0xb0 [ 57.202551] lockdep_rcu_suspicious+0x154/0x1a0 [ 57.202556] rpc_xprt_switch_has_addr+0x17c/0x190 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6] [ 57.202596] rpc_clnt_setup_test_and_add_xprt+0x50/0x180 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6] [ 57.202621] ? rpc_clnt_add_xprt+0x254/0x300 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6] [ 57.202646] rpc_clnt_add_xprt+0x27a/0x300 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6] [ 57.202671] ? __pfx_rpc_clnt_setup_test_and_add_xprt+0x10/0x10 [sunrpc ebe02571b9a8ceebf7d98e71675af20c19bdb1f6] [ 57.202696] nfs4_pnfs_ds_connect+0x345/0x760 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9] [ 57.202728] ? __pfx_nfs4_test_session_trunk+0x10/0x10 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9] [ 57.202754] nfs4_fl_prepare_ds+0x75/0xc0 [nfs_layout_nfsv41_files e3a4187f18ae8a27b630f9feae6831b584a9360a] [ 57.202760] filelayout_write_pagelist+0x4a/0x200 [nfs_layout_nfsv41_files e3a4187f18ae8a27b630f9feae6831b584a9360a] [ 57.202765] pnfs_generic_pg_writepages+0xbe/0x230 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9] [ 57.202788] __nfs_pageio_add_request+0x3fd/0x520 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202813] nfs_pageio_add_request+0x18b/0x390 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202831] nfs_do_writepage+0x116/0x1e0 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202849] nfs_writepages_callback+0x13/0x30 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202866] write_cache_pages+0x265/0x450 [ 57.202870] ? __pfx_nfs_writepages_callback+0x10/0x10 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202891] nfs_writepages+0x141/0x230 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202913] do_writepages+0xd2/0x230 [ 57.202917] ? filemap_fdatawrite_wbc+0x5c/0x80 [ 57.202921] filemap_fdatawrite_wbc+0x67/0x80 [ 57.202924] filemap_write_and_wait_range+0xd9/0x170 [ 57.202930] nfs_wb_all+0x49/0x180 [nfs 6c976fa593a7c2976f5a0aeb4965514a828e6902] [ 57.202947] nfs4_file_flush+0x72/0xb0 [nfsv4 c716d88496ded0ea6d289bbea684fa996f9b57a9] [ 57.202969] __se_sys_close+0x46/0xd0 [ 57.202972] do_syscall_64+0x68/0x100 [ 57.202975] ? do_syscall_64+0x77/0x100 [ 57.202976] ? do_syscall_64+0x77/0x100 [ 57.202979] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 57.202982] RIP: 0033:0x7fe2b12e4a94 [ 57.202985] Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 80 3d d5 18 0e 00 00 74 13 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 44 c3 0f 1f 00 48 83 ec 18 89 7c 24 0c e8 c3 [ 57.202987] RSP: 002b:00007ffe857ddb38 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 [ 57.202989] RAX: ffffffffffffffda RBX: 00007ffe857dfd68 RCX: 00007fe2b12e4a94 [ 57.202991] RDX: 0000000000002000 RSI: 00007ffe857ddc40 RDI: 0000000000000003 [ 57.202992] RBP: 00007ffe857dfc50 R08: 7fffffffffffffff R09: 0000000065650f49 [ 57.202993] R10: 00007fe2b11f8300 R11: 0000000000000202 R12: 0000000000000000 [ 57.202994] R13: 00007ffe857dfd80 R14: 00007fe2b1445000 R15: 0000000000000000 [ 57.202999] The problem seems to be that two out of three callers aren't taking the rcu_read_lock() before calling the list_for_each_entry_rcu() function in rpc_xprt_switch_has_addr(). I fix this by having rpc_xprt_switch_has_addr() unconditionaly take the rcu_read_lock(), which is okay to do recursively in the case that the lock has already been taken by a caller. Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker Reviewed-by: Jeff Layton --- v2: Don't provide a function bypass to skip taking the rcu_read_lock() --- net/sunrpc/xprtmultipath.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c index 701250b305db..0706575d9392 100644 --- a/net/sunrpc/xprtmultipath.c +++ b/net/sunrpc/xprtmultipath.c @@ -336,8 +336,9 @@ struct rpc_xprt *xprt_iter_current_entry_offline(struct rpc_xprt_iter *xpi) xprt_switch_find_current_entry_offline); } -bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps, - const struct sockaddr *sap) +static +bool __rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps, + const struct sockaddr *sap) { struct list_head *head; struct rpc_xprt *pos; @@ -356,6 +357,18 @@ bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps, return false; } +bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps, + const struct sockaddr *sap) +{ + bool res; + + rcu_read_lock(); + res = __rpc_xprt_switch_has_addr(xps, sap); + rcu_read_unlock(); + + return res; +} + static struct rpc_xprt *xprt_switch_find_next_entry(struct list_head *head, const struct rpc_xprt *cur, bool check_active)