From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44046C433EF for ; Mon, 13 Sep 2021 22:36:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B0A9603E7 for ; Mon, 13 Sep 2021 22:36:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244024AbhIMWiL (ORCPT ); Mon, 13 Sep 2021 18:38:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:50526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343709AbhIMWfO (ORCPT ); Mon, 13 Sep 2021 18:35:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 505D8610D2; Mon, 13 Sep 2021 22:33:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631572438; bh=eR5mA/KYUgsZO8yBub8XLFdqBGQN4hab0axEDgLGl1M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rk+nukGG8ZfnsU5tTHRegk5cLG3iiN5RyVRDtbK4UQ78Hcm9phRZymPjRKwmNa/El XbYOrM9V2k7KvylTo13WdQ4Uz9Bhor4ymedFbImb0nKGd8EkGnjIAid49vL/fQnXfQ 2sKSvGyw9d7LGuA5MF4g/esUv5wyX/i/96H6MUpQiPB/Lq2oEmUJS3KVBKDXIgWwGk G96/49EAgeB5cn/xmKQFUQjAjncDKOEUc7UwqjsWhirqh244P112DrbZVLFWPwuxAB LA0PuNomUHZ8p0JOQ8IKh1e75aSgDwDLUj9y58TUm3bvznf4A8hVLFBuJ7fuTxd+QM L/QAM+ewf7snA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Xiubo Li , Jeff Layton , Ilya Dryomov , Sasha Levin , ceph-devel@vger.kernel.org Subject: [PATCH AUTOSEL 5.14 13/25] ceph: remove the capsnaps when removing caps Date: Mon, 13 Sep 2021 18:33:27 -0400 Message-Id: <20210913223339.435347-13-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210913223339.435347-1-sashal@kernel.org> References: <20210913223339.435347-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Xiubo Li [ Upstream commit a6d37ccdd240e80f26aaea0e62cda310e0e184d7 ] capsnaps will take inode references via ihold when queueing to flush. When force unmounting, the client will just close the sessions and may never get a flush reply, causing a leak and inode ref leak. Fix this by removing the capsnaps for an inode when removing the caps. URL: https://tracker.ceph.com/issues/52295 Signed-off-by: Xiubo Li Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov Signed-off-by: Sasha Levin --- fs/ceph/caps.c | 68 +++++++++++++++++++++++++++++++++----------- fs/ceph/mds_client.c | 31 +++++++++++++++++++- fs/ceph/super.h | 6 ++++ 3 files changed, 87 insertions(+), 18 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index c2d654156783..73d8487a71d8 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -3114,7 +3114,16 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, break; } } - BUG_ON(!found); + + if (!found) { + /* + * The capsnap should already be removed when removing + * auth cap in the case of a forced unmount. + */ + WARN_ON_ONCE(ci->i_auth_cap); + goto unlock; + } + capsnap->dirty_pages -= nr; if (capsnap->dirty_pages == 0) { complete_capsnap = true; @@ -3136,6 +3145,7 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, complete_capsnap ? " (complete capsnap)" : ""); } +unlock: spin_unlock(&ci->i_ceph_lock); if (last) { @@ -3606,6 +3616,43 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, iput(inode); } +void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap, + bool *wake_ci, bool *wake_mdsc) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + bool ret; + + lockdep_assert_held(&ci->i_ceph_lock); + + dout("removing capsnap %p, inode %p ci %p\n", capsnap, inode, ci); + + list_del_init(&capsnap->ci_item); + ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush); + if (wake_ci) + *wake_ci = ret; + + spin_lock(&mdsc->cap_dirty_lock); + if (list_empty(&ci->i_cap_flush_list)) + list_del_init(&ci->i_flushing_item); + + ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush); + if (wake_mdsc) + *wake_mdsc = ret; + spin_unlock(&mdsc->cap_dirty_lock); +} + +void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap, + bool *wake_ci, bool *wake_mdsc) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + lockdep_assert_held(&ci->i_ceph_lock); + + WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing); + __ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc); +} + /* * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can * throw away our cap_snap. @@ -3643,23 +3690,10 @@ static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, capsnap, capsnap->follows); } } - if (flushed) { - WARN_ON(capsnap->dirty_pages || capsnap->writing); - dout(" removing %p cap_snap %p follows %lld\n", - inode, capsnap, follows); - list_del(&capsnap->ci_item); - wake_ci |= __detach_cap_flush_from_ci(ci, &capsnap->cap_flush); - - spin_lock(&mdsc->cap_dirty_lock); - - if (list_empty(&ci->i_cap_flush_list)) - list_del_init(&ci->i_flushing_item); - - wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, - &capsnap->cap_flush); - spin_unlock(&mdsc->cap_dirty_lock); - } + if (flushed) + ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc); spin_unlock(&ci->i_ceph_lock); + if (flushed) { ceph_put_snap_context(capsnap->context); ceph_put_cap_snap(capsnap); diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 0b69aec23e5c..bbd46b728eeb 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -1583,14 +1583,39 @@ int ceph_iterate_session_caps(struct ceph_mds_session *session, return ret; } +static int remove_capsnaps(struct ceph_mds_client *mdsc, struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_cap_snap *capsnap; + int capsnap_release = 0; + + lockdep_assert_held(&ci->i_ceph_lock); + + dout("removing capsnaps, ci is %p, inode is %p\n", ci, inode); + + while (!list_empty(&ci->i_cap_snaps)) { + capsnap = list_first_entry(&ci->i_cap_snaps, + struct ceph_cap_snap, ci_item); + __ceph_remove_capsnap(inode, capsnap, NULL, NULL); + ceph_put_snap_context(capsnap->context); + ceph_put_cap_snap(capsnap); + capsnap_release++; + } + wake_up_all(&ci->i_cap_wq); + wake_up_all(&mdsc->cap_flushing_wq); + return capsnap_release; +} + static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) { struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg; + struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_inode_info *ci = ceph_inode(inode); LIST_HEAD(to_remove); bool dirty_dropped = false; bool invalidate = false; + int capsnap_release = 0; dout("removing cap %p, ci is %p, inode is %p\n", cap, ci, &ci->vfs_inode); @@ -1598,7 +1623,6 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, __ceph_remove_cap(cap, false); if (!ci->i_auth_cap) { struct ceph_cap_flush *cf; - struct ceph_mds_client *mdsc = fsc->mdsc; if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { if (inode->i_data.nrpages > 0) @@ -1662,6 +1686,9 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove); ci->i_prealloc_cap_flush = NULL; } + + if (!list_empty(&ci->i_cap_snaps)) + capsnap_release = remove_capsnaps(mdsc, inode); } spin_unlock(&ci->i_ceph_lock); while (!list_empty(&to_remove)) { @@ -1678,6 +1705,8 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, ceph_queue_invalidate(inode); if (dirty_dropped) iput(inode); + while (capsnap_release--) + iput(inode); return 0; } diff --git a/fs/ceph/super.h b/fs/ceph/super.h index b1a363641beb..2200ed76b123 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -1163,6 +1163,12 @@ extern void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had); extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, struct ceph_snap_context *snapc); +extern void __ceph_remove_capsnap(struct inode *inode, + struct ceph_cap_snap *capsnap, + bool *wake_ci, bool *wake_mdsc); +extern void ceph_remove_capsnap(struct inode *inode, + struct ceph_cap_snap *capsnap, + bool *wake_ci, bool *wake_mdsc); extern void ceph_flush_snaps(struct ceph_inode_info *ci, struct ceph_mds_session **psession); extern bool __ceph_should_report_size(struct ceph_inode_info *ci); -- 2.30.2