linux-ext4 - Re: [PATCH] Add largedir feature

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Date:   Mon, 1 May 2017 11:58:24 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Artem Blagodarenko <artem.blagodarenko@...il.com>,
        linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca,
        alexey.lyashkov@...il.com, Yang Sheng <yang.sheng@...el.com>,
        Artem Blagodarenko <artem.blagodarenko@...gate.com>
Subject: Re: [PATCH] Add largedir feature

On Sat, Apr 29, 2017 at 08:59:53PM -0400, Theodore Ts'o wrote:
> On Thu, Mar 16, 2017 at 05:51:17AM -0400, Artem Blagodarenko wrote:
> > From: Artem Blagodarenko <artem.blagodarenko@...il.com>
> > 
> > This INCOMPAT_LARGEDIR feature allows larger directories to be created
> > in ldiskfs, both with directory sizes over 2GB and and a maximum htree
> > depth of 3 instead of the current limit of 2. These features are needed
> > in order to exceed the current limit of approximately 10M entries in a
> > single directory.
> > 
> > Signed-off-by: Yang Sheng <yang.sheng@...el.com>
> > Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...gate.com>
> 
> Thanks, applied.
> 
> 					- Ted

FYI, this patch is causing a problem when creating many files in a directory
(without the largedir feature enabled).  I haven't looked into it but maybe it
will ring a bell for someone.

seq -f "abcdefghijklmnopqrstuvwxyz012345%.0f" 100000 | xargs touch

[   42.726480] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.729472] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.731689] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.734303] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.736383] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.739133] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.741307] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.743963] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
[   42.745998] EXT4-fs error (device vdc): dx_probe:840: inode #2: block 508: comm touch: Directory index failed checksum
...