linux-ext4 - Re: [PATCH 2/7] e2fsck: Fix indexed dir rehash failure with metadata

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Message-ID: <20200307231719.GE99899@mit.edu>
Date:   Sat, 7 Mar 2020 18:17:19 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/7] e2fsck: Fix indexed dir rehash failure with
 metadata_csum enabled

On Thu, Feb 13, 2020 at 11:15:57AM +0100, Jan Kara wrote:
> 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.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Applied with a minor change; I didn't want to make this change:

> -_INLINE_ int ext2fs_htree_intnode_maxrecs(ext2_filsys fs, int blocks)
> +static inline int ext2fs_htree_intnode_maxrecs(ext2_filsys fs, int blocks)

... because it would make ext2fs_htree_intmode_maxrecs disappear from libext2fs.so.

So I changed this:

> +	if (ext2fs_has_feature_metadata_csum(fs->super))

to this:

+       if ((EXT2_SB(fs->super)->s_feature_ro_compat &
+            EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) != 0)

to fix the inline related compilation errors.

					- Ted