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From 5ddac7d248ad346b80702a397c886df4d1ec4f08 Mon Sep 17 00:00:00 2001
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From: Jan Kara <jack@suse.cz>
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Date: Thu, 13 Feb 2020 11:15:57 +0100
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Subject: [PATCH 05/46] e2fsck: fix indexed dir rehash failure with
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metadata_csum enabled
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Content-Type: text/plain
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E2fsck directory rehashing code can fail with ENOSPC due to a bug in
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ext2fs_htree_intnode_maxrecs() which fails to take metadata checksum
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into account and thus e.g. e2fsck can decide to create 1 indirect level
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of index tree when two are actually needed. Fix the logic to account for
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metadata checksum.
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Reviewed-by: Andreas Dilger <adilger@dilger.ca>
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Signed-off-by: Jan Kara <jack@suse.cz>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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---
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lib/ext2fs/ext2fs.h | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
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index 32c75171..d9aec525 100644
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--- a/lib/ext2fs/ext2fs.h
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+++ b/lib/ext2fs/ext2fs.h
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@@ -2040,7 +2040,13 @@ _INLINE_ blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
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_INLINE_ int ext2fs_htree_intnode_maxrecs(ext2_filsys fs, int blocks)
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{
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- return blocks * ((fs->blocksize - 8) / sizeof(struct ext2_dx_entry));
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+ int csum_size = 0;
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+
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+ if ((EXT2_SB(fs->super)->s_feature_ro_compat &
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+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) != 0)
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+ csum_size = sizeof(struct ext2_dx_tail);
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+ return blocks * ((fs->blocksize - (8 + csum_size)) /
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+ sizeof(struct ext2_dx_entry));
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}
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/*
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--
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2.35.1
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