From patchwork Fri Dec 15 08:22:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 13494120 Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) (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 B096D171DB for ; Fri, 15 Dec 2023 08:36:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.112]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4Ss2F11wVhz1Q6Nl; Fri, 15 Dec 2023 16:19:17 +0800 (CST) Received: from kwepemi500009.china.huawei.com (unknown [7.221.188.199]) by mail.maildlp.com (Postfix) with ESMTPS id BBD52140516; Fri, 15 Dec 2023 16:20:26 +0800 (CST) Received: from localhost.localdomain (10.175.127.227) by kwepemi500009.china.huawei.com (7.221.188.199) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Fri, 15 Dec 2023 16:20:25 +0800 From: Long Li To: , CC: , , , , Subject: [PATCH v4 2/2] xfs: fix perag leak when growfs fails Date: Fri, 15 Dec 2023 16:22:34 +0800 Message-ID: <20231215082234.3393812-2-leo.lilong@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231215082234.3393812-1-leo.lilong@huawei.com> References: <20231215082234.3393812-1-leo.lilong@huawei.com> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemi500009.china.huawei.com (7.221.188.199) During growfs, if new ag in memory has been initialized, however sb_agcount has not been updated, if an error occurs at this time it will cause perag leaks as follows, these new AGs will not been freed during umount , because of these new AGs are not visible(that is included in mp->m_sb.sb_agcount). unreferenced object 0xffff88810be40200 (size 512): comm "xfs_growfs", pid 857, jiffies 4294909093 hex dump (first 32 bytes): 00 c0 c1 05 81 88 ff ff 04 00 00 00 00 00 00 00 ................ 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 381741e2): [] __kmalloc+0x386/0x4f0 [] kmem_alloc+0xb5/0x2f0 [] xfs_initialize_perag+0xc5/0x810 [] xfs_growfs_data+0x9bc/0xbc0 [] xfs_file_ioctl+0x5fe/0x14d0 [] __x64_sys_ioctl+0x144/0x1c0 [] do_syscall_64+0x3f/0xe0 [] entry_SYSCALL_64_after_hwframe+0x62/0x6a unreferenced object 0xffff88810be40800 (size 512): comm "xfs_growfs", pid 857, jiffies 4294909093 hex dump (first 32 bytes): 20 00 00 00 00 00 00 00 57 ef be dc 00 00 00 00 .......W....... 10 08 e4 0b 81 88 ff ff 10 08 e4 0b 81 88 ff ff ................ backtrace (crc bde50e2d): [] __kmalloc_node+0x3da/0x540 [] kvmalloc_node+0x99/0x160 [] bucket_table_alloc.isra.0+0x5f/0x400 [] rhashtable_init+0x405/0x760 [] xfs_initialize_perag+0x3a3/0x810 [] xfs_growfs_data+0x9bc/0xbc0 [] xfs_file_ioctl+0x5fe/0x14d0 [] __x64_sys_ioctl+0x144/0x1c0 [] do_syscall_64+0x3f/0xe0 [] entry_SYSCALL_64_after_hwframe+0x62/0x6a Factor out xfs_free_unused_perag_range() from xfs_initialize_perag(), used for freeing unused perag within a specified range in error handling, included in the error path of the growfs failure. Fixes: 1c1c6ebcf528 ("xfs: Replace per-ag array with a radix tree") Signed-off-by: Long Li Reviewed-by: Darrick J. Wong --- v4: - this patch fix a memleak bug, so add a fix tag to the patch. fs/xfs/libxfs/xfs_ag.c | 36 ++++++++++++++++++++++++++---------- fs/xfs/libxfs/xfs_ag.h | 2 ++ fs/xfs/xfs_fsops.c | 5 ++++- 3 files changed, 32 insertions(+), 11 deletions(-) diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c index c730976fdfc0..39d9525270b7 100644 --- a/fs/xfs/libxfs/xfs_ag.c +++ b/fs/xfs/libxfs/xfs_ag.c @@ -332,6 +332,31 @@ xfs_agino_range( return __xfs_agino_range(mp, xfs_ag_block_count(mp, agno), first, last); } +/* + * Free perag within the specified AG range, it is only used to free unused + * perags under the error handling path. + */ +void +xfs_free_unused_perag_range( + struct xfs_mount *mp, + xfs_agnumber_t agstart, + xfs_agnumber_t agend) +{ + struct xfs_perag *pag; + xfs_agnumber_t index; + + for (index = agstart; index < agend; index++) { + spin_lock(&mp->m_perag_lock); + pag = radix_tree_delete(&mp->m_perag_tree, index); + spin_unlock(&mp->m_perag_lock); + if (!pag) + break; + xfs_buf_hash_destroy(pag); + xfs_defer_drain_free(&pag->pag_intents_drain); + kmem_free(pag); + } +} + int xfs_initialize_perag( struct xfs_mount *mp, @@ -431,16 +456,7 @@ xfs_initialize_perag( kmem_free(pag); out_unwind_new_pags: /* unwind any prior newly initialized pags */ - for (index = first_initialised; index < agcount; index++) { - spin_lock(&mp->m_perag_lock); - pag = radix_tree_delete(&mp->m_perag_tree, index); - spin_unlock(&mp->m_perag_lock); - if (!pag) - break; - xfs_buf_hash_destroy(pag); - xfs_defer_drain_free(&pag->pag_intents_drain); - kmem_free(pag); - } + xfs_free_unused_perag_range(mp, first_initialised, agcount); return error; } diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h index 2e0aef87d633..40d7b6427afb 100644 --- a/fs/xfs/libxfs/xfs_ag.h +++ b/fs/xfs/libxfs/xfs_ag.h @@ -133,6 +133,8 @@ __XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA) __XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES) __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET) +void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart, + xfs_agnumber_t agend); int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount, xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi); int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno); diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index e8759b479516..22c3f1e9008e 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -153,7 +153,7 @@ xfs_growfs_data_private( error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, -delta, 0, 0, &tp); if (error) - return error; + goto out_free_unused_perag; last_pag = xfs_perag_get(mp, oagcount - 1); if (delta > 0) { @@ -227,6 +227,9 @@ xfs_growfs_data_private( out_trans_cancel: xfs_trans_cancel(tp); +out_free_unused_perag: + if (nagcount > oagcount) + xfs_free_unused_perag_range(mp, oagcount, nagcount); return error; }