From: Theodore Ts'o <tytso@mit.edu>
Subject: Re: [PATCH v3] Add largedir feature
Date: Sat, 24 Jun 2017 01:43:56 -0400
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Cc: Artem Blagodarenko <artem.blagodarenko@gmail.com>,
        linux-ext4 <linux-ext4@vger.kernel.org>,
        Alexey Lyashkov <alexey.lyashkov@gmail.com>,
        Eric Biggers <ebiggers3@gmail.com>,
        Yang Sheng <yang.sheng@intel.com>,
        Artem Blagodarenko <artem.blagodarenko@seagate.com>
To: Andreas Dilger <adilger@dilger.ca>
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It looks like there are at least two xfstests failures if the largedir
feature is enabled.  generic/021 fails, but I think this may be a test
issue because it seems to be a mke2fs complaining about not having
enough space to create the file system.

generic/027, which is an ENOSPC hitter, is failing with largedir
enabled, but apparently it hasn't been failing w/o this feature being
enabled.  The test description is "Run 8 processes writing 1k files to
seperate files in seperate dirs to hit ENOSPC on small fs with little
free space. Loop for 100 iterations."

This was using the following configuration:

export EXT_MKFS_OPTIONS="-I 2048 -O ^64bit,mmp,uninit_bg,^extents,large_dir,dir_nlink,quota,huge_file,flex_bg -E lazy_journal_init"

						- Ted