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Re: [GRUB PATCH] xfs: accept filesystem with sparse inodes

From: Chris Murphy
Subject: Re: [GRUB PATCH] xfs: accept filesystem with sparse inodes
Date: Sat, 19 May 2018 11:52:44 -0600

On Wed, May 16, 2018 at 3:00 AM, Daniel Kiper <address@hidden> wrote:
> On Tue, May 15, 2018 at 02:55:55PM -0500, Eric Sandeen wrote:
>> The sparse inode metadata format became a mkfs.xfs default in
>> xfsprogs-4.16.0, and such filesystems are now rejected by grub as
>> containing an incompatible feature.
>> In essence, this feature allows xfs to allocate inodes into fragmented
>> freespace.  (Without this feature, if xfs could not allocate contiguous
>> space for 64 new inodes, inode creation would fail.)
>> In practice, the disk format change is restricted to the inode btree,
>> which as far as I can tell is not used by grub.  If all you're doing
>> today is parsing a directory, reading an inode number, and converting
>> that inode number to a disk location, then ignoring this feature
>> should be fine, so I've added it to XFS_SB_FEAT_INCOMPAT_SUPPORTED
>> I did some brief testing of this patch by hacking up the regression
>> tests to completely fragment freespace on the test xfs filesystem, and
>> then write a large-ish number of inodes to consume any existing
>> contiguous 64-inode chunk.  This way any files the grub tests add and
>> traverse would be in such a fragmented inode allocation.  Tests passed,
>> but I'm not sure how to cleanly integrate that into the test harness.
>> Signed-off-by: Eric Sandeen <address@hidden>
> Eric, thank you for posting the patch. LGTM.
> Chris, may I ask you to test it and add your "Tested-by:" if it works?

Fedora openQA (which caught the bug) now passes. I did a separate test
making sure sparse inode feature is enabled and grub-probe,
grub-install, grub-mkconfig report no problem. So yeah feel free to
Tested-by to me.

Chris Murphy

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