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Bug#691568: marked as done (btrfs: can't have many hardlinks to a given inode in a given directory)

Your message dated Sat, 04 Jun 2016 22:36:06 +0100
with message-id <1465076166.2847.167.camel@decadent.org.uk>
and subject line Re: btrfs-tools: btrfs fs: Hardlinks-per-directory limit hit
has caused the Debian Bug report #633062,
regarding btrfs: can't have many hardlinks to a given inode in a given directory
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
633062: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=633062
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Source: linux
Version: 3.2.32-1
Severity: wishlist
Justification: difficult
Tags: upstream patch moreinfo

Hi,

As described at [1], btrfs limits (to less than 200 or so) on the
number of hard links to a single inode in a given directory.  This is
due to a flaw in the on-disk format.

This hurts busybox-style programs like git that want to keep many
links to a single binary and backup programs like backuppc.

3.7-rc1 is said to fix this[2], provided users set an appropriate
on-disk flag to accept the format bump.  Ideally I'd like to see these
patches in wheezy so that wheezy could read such filesystems once they
become more widespread.

  b916a59adfdc Btrfs: add missing read locks in backref.c
  5a1d7843ca4b btrfs: improved readablity for add_inode_ref
  f186373fef00 btrfs: extended inode refs
  d24bec3ae528 btrfs: extended inode ref iteration

Untested.  Patches attached for reference.  Any heroes to try these
with xfstests and then in everyday use?  Until they get more testing,
perhaps they can provide some amusement.

Thanks,
Jonathan

[1] http://bugs.debian.org/642603
http://thread.gmane.org/gmane.comp.file-systems.btrfs/6285/focus=6354
[2] http://thread.gmane.org/gmane.comp.file-systems.btrfs/19287

--- End Message ---
--- Begin Message --- 
Version: 3.7.1-1~experimental.1

This was fixed with the 'extended inode refs' feature in Linux 3.7.

Ben.

--
Ben Hutchings
The most exhausting thing in life is being insincere. - Anne Morrow
Lindberg

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