Re: [PATCH] xfs: unset MS_ACTIVE if mount fails

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On Mon, Oct 17, 2016 at 06:10:51PM -0700, Darrick J. Wong wrote:
> As part of the inode block map intent log item recovery process, we had
> to set the IRECOVERY flag to prevent an unlinked inode from being
> truncated during the first iput call.  This required us to set MS_ACTIVE
> so that iput puts the inode on the lru instead of immediately evicting
> the inode.
> 
> Unfortunately, if the mount fails later on, the inodes that have been
> loaded (root dir and realtime) actually need to be evicted since we're
> aborting the mount.  If we don't clear MS_ACTIVE in the failure step,
> those inodes are not evicted and therefore leak.   The leak was found
> by running xfs/130 and rmmoding xfs immediately after the test.

Actually that was an item I wanted to sort out about reflink before
we got it merged..

Can you explain why we even added the MS_ACTIVE flag?  Is it
to fool iput_final into keeping the inode on the lru?  I'd really
prefer if we could just do it in our own ->drop_inode call then
instead of messing with MS_ACTIVE.
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