From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753578AbdJGWtv (ORCPT ); Sat, 7 Oct 2017 18:49:51 -0400 Received: from fldsmtpe03.verizon.com ([140.108.26.142]:3598 "EHLO fldsmtpe03.verizon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753492AbdJGWiS (ORCPT ); Sat, 7 Oct 2017 18:38:18 -0400 From: "Levin, Alexander (Sasha Levin)" Cc: Jan Kara , "Theodore Ts'o" , "Levin, Alexander (Sasha Levin)" X-Host: endeavour.tdc.vzwcorp.com To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: [PATCH review for 4.9 14/50] ext4: fix stripe-unaligned allocations Thread-Topic: [PATCH review for 4.9 14/50] ext4: fix stripe-unaligned allocations Thread-Index: AQHTP7zDIWsrkPYeHUO6ZlTek5MTdw== Date: Sat, 7 Oct 2017 22:36:49 +0000 Message-ID: <20171007223636.24797-14-alexander.levin@verizon.com> References: <20171007223636.24797-1-alexander.levin@verizon.com> In-Reply-To: <20171007223636.24797-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v97MnuFT029853 From: Jan Kara [ Upstream commit d9b22cf9f5466a057f2a4f1e642b469fa9d73117 ] When a filesystem is created using: mkfs.ext4 -b 4096 -E stride=512 and we try to allocate 64MB extent, we will end up directly in ext4_mb_complex_scan_group(). This is because the request is detected as power-of-two allocation (so we start in ext4_mb_regular_allocator() with ac_criteria == 0) however the check before ext4_mb_simple_scan_group() refuses the direct buddy scan because the allocation request is too large. Since cr == 0, the check whether we should use ext4_mb_scan_aligned() fails as well and we fall back to ext4_mb_complex_scan_group(). Fix the problem by checking for upper limit on power-of-two requests directly when detecting them. Reported-by: Ross Zwisler Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/mballoc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 846b57ff58de..64056c6eb857 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2136,8 +2136,10 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac) * We search using buddy data only if the order of the request * is greater than equal to the sbi_s_mb_order2_reqs * You can tune it via /sys/fs/ext4//mb_order2_req + * We also support searching for power-of-two requests only for + * requests upto maximum buddy size we have constructed. */ - if (i >= sbi->s_mb_order2_reqs) { + if (i >= sbi->s_mb_order2_reqs && i <= sb->s_blocksize_bits + 2) { /* * This should tell if fe_len is exactly power of 2 */ @@ -2207,7 +2209,7 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac) } ac->ac_groups_scanned++; - if (cr == 0 && ac->ac_2order < sb->s_blocksize_bits+2) + if (cr == 0) ext4_mb_simple_scan_group(ac, &e4b); else if (cr == 1 && sbi->s_stripe && !(ac->ac_g_ex.fe_len % sbi->s_stripe)) -- 2.11.0