On 11/22/2016 05:02 PM, Dave Chinner wrote:
On Tue, Nov 22, 2016 at 04:12:56PM -0700, Jens Axboe wrote:
On 11/22/2016 03:52 PM, Dave Chinner wrote:
On Sun, Nov 13, 2016 at 08:07:29PM +0100, Christoph Hellwig wrote:
Hi all,
this series adds a new direct I/O implementation based on the iomap
interface, and switches XFS to use it.
The first two patches are a resend of my earlier series to remove the
XFS iolock. They are needed for the lockdep assert in the new iomap
code.
The rest implements a new iomap_dio_rw direct I/O implementation and
switches XFS to use it.
Note that this series is on top of a merge of the XFS for-next
tree with the block tree, which has a new helper needed for this
implementation. This is the block tree it's on top of:
git://git.kernel.dk/linux-block for-4.10/block
This tree fails compilation for me.
block/blk-flush.c: In function "flush_data_end_io":
block/blk-flush.c:369:20: error: "REQ_STARTED" undeclared (first use in this function)
rq->cmd_flags &= ~REQ_STARTED;
^~~~~~~~~~~
block/blk-flush.c:369:20: note: each undeclared identifier is reported only once for each function it appears in
Should be RQF_STARTED, right?
My branch is fine, I'm guessing it's Christophs merge with master that
broke things.
No, I merged an hour old for-4.10/block into a pristine 4.9-rc6 tree
and got this error.
Right, then you also missed it ;-)
The blk-flush.c thing doesn't throw a merge conflict, but
you still have to resolve it...
I've never seen an unreported merge problem like this before - if
there are hunks being silently dropped on the floor during a merge,
then I'd say we have a git bug.... Indeed, there were reported
conflicts I resolved, but there was nothing that pointed me at the
above being a merge issue until after I'd committed the merge and
went to build the result...
It's because for-4.10/block was branched off before a fix that went into
4.9 later on, which added the the clearing of started:
commit 94d7dea448fae6cbb83395323c1d2fd7f19dc388
Author: Ming Lei <tom.leiming@xxxxxxxxx>
Date: Wed Oct 26 16:57:15 2016 +0800
block: flush: fix IO hang in case of flood fua req
So the fact that it doesn't trigger a merge conflict is fine.
To make everyones life easie I also have a git tree with the merge
plus the patches in this series available here:
git://git.infradead.org/users/hch/vfs.git iomap-dio.3
Is there a stable topic branch with all the relevant block changes
in it? I'd like to pull this into the XFS tree so I can test it, but
these things need to be pulled from the block tree:
- REQ_IDLE is undefined
- bio_iov_iter_get_pages() is undefined
- blk_mq_poll() is undefined
Having these in a stable topic branch (or set of branches) would
make this much easier for me....
You can use my for-next, it has the block/fs changes and merged with
whatever should conflict with current Linus.
I don't want to pull the entire block tree into the XFS tree, just
the bare minimum needed to resolve the missing functionality this
patchset requires. We do this regularly with filesystem trees to
resolve cross-fs development dependencies....
That's going to be somewhat harder... The REQ_IDLE used to be
REQ_NOIDLE. bio_iov_iter_get_pages() is a single commit, so that's easy
enough. The poll bits are 3-4 patches, so not too bad either.
--
Jens Axboe
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