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