From mboxrd@z Thu Jan 1 00:00:00 1970 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 1D06115532C for ; Mon, 22 Apr 2024 16:40:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713804016; cv=none; b=CKBikns+t2xUrjczcPX/h3MVpVnmu9l2UPh2uBh2Laxra7wfQONrSmfKIb1Rqipbl2+NdC7zsgrrBdEso56r5K6H3TWZyhOvifxkvDMY4id/zitq7DN+gGrUjebHijMyhniaKxNeozxGt5aUllI8qQaITwjfHVPD9Xab26kiwvs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713804016; c=relaxed/simple; bh=etCbGVxQf0Sx64up78GHdAXT/fIstmZ/FJLURz1MJvw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bWBkGf2YYLgsOr1iqwRqLYaZvTVaQatf9V1SEouBQ/uw4TqxkGlDoh0tjLgMfUxCPLQGBoJhKthhtpnFk0gsJzsNBHDmdzEx9l978OMtBLGxtvMF8QpWXwnPiq1CCCNw4EgR0KyTSjNLQg2eoPSlG4qTOil4vsuu2oEiUBxhCPE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GYO3EX1j; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GYO3EX1j" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EFE9FC116B1; Mon, 22 Apr 2024 16:40:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713804016; bh=etCbGVxQf0Sx64up78GHdAXT/fIstmZ/FJLURz1MJvw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GYO3EX1jmc59EfWH7ntQSXRfgjFwxP0CHx90V61us8Te9zRiRGDFP+nuZ0GPXu85x jhvwkPMYWqZp89eqk51ncrOYjDnUFmphFtywUEwbQobSKFBYxtnnn75fe2GKal1JrZ Q9vXQ/fPdlu14Jgio0am81RTTN1Bo9vSe7WjlKPmnkVcU8YwsP/plC29cLqiTCpoIQ lakv4LvUYfxTV3Gi2RIvFxq7eYDPswReJfmpGB6Bg82eIEpDM8vS34PxNCfeJtOWp8 sGaGT3WPKe7nt34w0K0sEQDHv4AiT69eHi5+qeiCxyiZTvCnlc4YERm9Nu8egbAbfo Y2klocaxXsaDA== From: cem@kernel.org To: linux-xfs@vger.kernel.org Cc: djwong@kernel.org, hch@lst.de Subject: [PATCH 45/67] xfs: fix perag leak when growfs fails Date: Mon, 22 Apr 2024 18:26:07 +0200 Message-ID: <20240422163832.858420-47-cem@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240422163832.858420-2-cem@kernel.org> References: <20240422163832.858420-2-cem@kernel.org> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Long Li Source kernel commit: 7823921887750b39d02e6b44faafdd1cc617c651 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" Signed-off-by: Chandan Babu R Signed-off-by: Carlos Maiolino --- libxfs/xfs_ag.c | 36 ++++++++++++++++++++++++++---------- libxfs/xfs_ag.h | 2 ++ 2 files changed, 28 insertions(+), 10 deletions(-) diff --git a/libxfs/xfs_ag.c b/libxfs/xfs_ag.c index 1dbc01b97..0556d5547 100644 --- a/libxfs/xfs_ag.c +++ b/libxfs/xfs_ag.c @@ -330,6 +330,31 @@ 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, @@ -429,16 +454,7 @@ out_free_pag: 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/libxfs/xfs_ag.h b/libxfs/xfs_ag.h index 67c3260ee..4b343c4fa 100644 --- a/libxfs/xfs_ag.h +++ b/libxfs/xfs_ag.h @@ -143,6 +143,8 @@ __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); -- 2.44.0