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From 80f665e8365607a9885ca6a136cdeffacf9860d6 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 00:24:57 -0400
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Subject: [PATCH 02/16] libext2fs: fix maximum bg overhead calculation with
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meta_bg enabled
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commit 1abdd04eb1d19488493022f81c03f5b80aa7fcc7
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When meta_bg is enabled at mkfs time, we put at most one group
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descriptor block in each blockgroup. Unfortunately, the calculation
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of max overhead per bg doesn't know this, so mkfs fails when it isn't
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strictly necessary. Fix it, since Dave reported that he couldn't
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create a 500TB ext4 filesystem.
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Reported-by: Dave Chinner <david@fromorbit.com>
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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 | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
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index 2db8b3c2..3548c56c 100644
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--- a/lib/ext2fs/initialize.c
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+++ b/lib/ext2fs/initialize.c
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@@ -377,7 +377,12 @@ ipg_retry:
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* table, and the reserved gdt blocks.
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*/
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overhead = (int) (3 + fs->inode_blocks_per_group +
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- fs->desc_blocks + super->s_reserved_gdt_blocks);
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+ super->s_reserved_gdt_blocks);
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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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+ overhead += fs->desc_blocks;
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/* This can only happen if the user requested too many inodes */
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if (overhead > super->s_blocks_per_group) {
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--
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2.20.1
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