From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lukas Czerner Subject: [PATCH v2 2/3] ext4: Try to initialize all groups we can in case of failure on ppc64 Date: Tue, 2 Jun 2015 14:24:49 +0200 Message-ID: <1433247890-15570-2-git-send-email-lczerner@redhat.com> References: <1433247890-15570-1-git-send-email-lczerner@redhat.com> Cc: Lukas Czerner To: linux-ext4@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:57838 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754071AbbFBMYz (ORCPT ); Tue, 2 Jun 2015 08:24:55 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 0F7F819F22F for ; Tue, 2 Jun 2015 12:24:55 +0000 (UTC) In-Reply-To: <1433247890-15570-1-git-send-email-lczerner@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Currently on the machines with page size > block size when initializing block group buddy cache we initialize it for all the block group bitmaps in the page. However in the case of read error, checksum error, or if a single bitmap is in any way corrupted we would fail to initialize all of the bitmaps. This is problematic because we will not have access to the other allocation groups even though those might be perfectly fine and usable. Fix this by reading all the bitmaps instead of error out on the first problem and simply skip the bitmaps which were either not read properly, or are not valid. Signed-off-by: Lukas Czerner --- v2: remove unnecessary else in condition fs/ext4/mballoc.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 8d1e602..df02951 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -882,10 +882,8 @@ static int ext4_mb_init_cache(struct page *page, char *incore) /* wait for I/O completion */ for (i = 0, group = first_group; i < groups_per_page; i++, group++) { - if (bh[i] && ext4_wait_block_bitmap(sb, group, bh[i])) { + if (bh[i] && ext4_wait_block_bitmap(sb, group, bh[i])) err = -EIO; - goto out; - } } first_block = page->index * blocks_per_page; @@ -898,6 +896,11 @@ static int ext4_mb_init_cache(struct page *page, char *incore) /* skip initialized uptodate buddy */ continue; + if (!buffer_verified(bh[group - first_group])) + /* Skip faulty bitmaps */ + continue; + err = 0; + /* * data carry information regarding this * particular group in the format specified -- 1.8.3.1