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From 4198ce4de86d2144ce127bba0d263a005926acf2 Mon Sep 17 00:00:00 2001
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From: "Darrick J. Wong" <darrick.wong@oracle.com>
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Date: Sat, 24 Oct 2015 00:30:02 -0400
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Subject: [PATCH 03/16] libext2fs: automatically enable meta_bg to avoid
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filling up BG 0
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commit 03940aac5492879ef365b07e69105a98f4dbabf9
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If during formatting we'd lose more than 75% a block group to group
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descriptors and other metadata, enable the meta_bg feature. This
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enables us to create >500T filesystems with default options.
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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---
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lib/ext2fs/initialize.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
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index 3548c56c..0b8355d8 100644
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--- a/lib/ext2fs/initialize.c
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+++ b/lib/ext2fs/initialize.c
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@@ -379,6 +379,11 @@ ipg_retry:
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overhead = (int) (3 + fs->inode_blocks_per_group +
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super->s_reserved_gdt_blocks);
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+ /* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
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+ if (super->s_reserved_gdt_blocks + fs->desc_blocks >
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+ super->s_blocks_per_group * 3 / 4)
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+ fs->super->s_feature_incompat |= EXT2_FEATURE_INCOMPAT_META_BG;
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+
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if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
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overhead++;
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else
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--
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2.20.1
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