From: Brian Foster <bfoster@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 01/11] FOLD: improve xfs_bmapi_delalloc
Date: Fri, 1 Feb 2019 07:46:56 -0500 [thread overview]
Message-ID: <20190201124655.GB40798@bfoster> (raw)
In-Reply-To: <20190201072820.GA14783@lst.de>
On Fri, Feb 01, 2019 at 08:28:20AM +0100, Christoph Hellwig wrote:
> On Fri, Feb 01, 2019 at 08:23:22AM +0100, Christoph Hellwig wrote:
> > > > flags |= XFS_BMAPI_DELALLOC;
> > > > - return xfs_bmapi_write(tp, ip, bno, 1, flags, total, imap, nimaps);
> > > > + error = xfs_bmapi_write(tp, ip, offset_fsb, 1, flags,
> > > > + XFS_EXTENTADD_SPACE_RES(ip->i_mount, XFS_DATA_FORK),
> > >
> > > Shouldn't this be whichfork?
> >
> > Yeah.
>
> Actually - XFS_EXTENTADD_SPACE_RES expands to XFS_BM_MAXLEVELS, which
> indexes into m_bm_maxlevels, which only contains two members, one for
> the data and one for the attr fork. So this should stay a hardcoded
> XFS_DATA_FORK.
Ok, I see. Hmm.. I'm wondering how accurate the ->total value is in the
delalloc conversion path. IIUC, the purpose is to try and select an AG
with enough blocks for the allocation along with the indirect blocks to
insert into the bmbt. Both of those have been reserved at delalloc res
time, hence not needed in the tx. The AG selection code uses the max of
total and the allocation request size, which means that for most
conversions (> maxlevels) total is a no-op. Shouldn't total reflect the
full size of the allocation (alloc size + maxlevels) regardless of
whether the blocks were already "globally reserved?" Note that this is
existing code and probably not something I would change in this series..
That aside, I'll repost my series with this folded in and the other bits
dropped..
Brian
next prev parent reply other threads:[~2019-02-01 12:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 7:55 make delalloc conversion more robust and clear Christoph Hellwig
2019-01-31 7:55 ` [PATCH 01/11] FOLD: improve xfs_bmapi_delalloc Christoph Hellwig
2019-01-31 18:09 ` Brian Foster
2019-02-01 7:23 ` Christoph Hellwig
2019-02-01 7:28 ` Christoph Hellwig
2019-02-01 12:46 ` Brian Foster [this message]
2019-02-01 16:08 ` Christoph Hellwig
2019-01-31 7:55 ` [PATCH 02/11] xfs: remove the io_type field from the writeback context and ioend Christoph Hellwig
2019-01-31 18:10 ` Brian Foster
2019-01-31 7:55 ` [PATCH 03/11] xfs: remove the s_maxbytes checks in xfs_map_blocks Christoph Hellwig
2019-01-31 18:10 ` Brian Foster
2019-01-31 7:55 ` [PATCH 04/11] xfs: don't try to map blocks beyond i_size in writeback Christoph Hellwig
2019-01-31 18:11 ` Brian Foster
2019-02-01 7:25 ` Christoph Hellwig
2019-02-01 12:46 ` Brian Foster
2019-02-01 16:07 ` Christoph Hellwig
2019-01-31 7:55 ` [PATCH 05/11] xfs: simplify the xfs_bmap_btree_to_extents calling conventions Christoph Hellwig
2019-01-31 18:11 ` Brian Foster
2019-01-31 7:55 ` [PATCH 06/11] xfs: factor out two helpers from xfs_bmapi_write Christoph Hellwig
2019-01-31 18:28 ` Brian Foster
2019-01-31 7:55 ` [PATCH 07/11] xfs: split XFS_BMAPI_DELALLOC handling " Christoph Hellwig
2019-01-31 19:28 ` Brian Foster
2019-01-31 7:55 ` [PATCH 08/11] xfs: move transaction handling to xfs_bmapi_convert_delalloc Christoph Hellwig
2019-01-31 19:28 ` Brian Foster
2019-01-31 7:55 ` [PATCH 09/11] xfs: move stat accounting " Christoph Hellwig
2019-01-31 19:29 ` Brian Foster
2019-01-31 7:55 ` [PATCH 10/11] xfs: move xfs_iomap_write_allocate to xfs_aops.c Christoph Hellwig
2019-01-31 19:31 ` Brian Foster
2019-01-31 7:55 ` [PATCH 11/11] xfs: retry COW fork delalloc conversion when no extent was found Christoph Hellwig
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