Release fstests v2023.08.27
generic/471: Remove this broken case
I remember this case fails on last year becuase of
kernel commit cae2de69 ("iomap: Add async buffered write support")
kernel commit 1aa91d9 ("xfs: Add async buffered write support").
as below:
pwrite: Resource temporarily unavailable
wrote 8388608/8388608 bytes at offset 0
XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-RWF_NOWAIT time is within limits.
+pwrite: Resource temporarily unavailable
+(standard_in) 1: syntax error
+RWF_NOWAIT took seconds
So For async buffered write requests, the request will return -EAGAIN
if the ilock cannot be obtained immediately.
Here also a discussion[1] that seems generic/471 has been broken.
Now, I met this problem in my linux distribution, then I found the above
discussion. IMO, remove this case is ok and then we can avoid to meet this
false report again.
[Additional information from Dave Chinner]
We changed how timestamps are updated so that they are aware of
IOCB_NOWAIT. If the IOCB_NOWIAT DIO write now needs to update the
inode timestamps, it will return -EAGAIN instead of doing
potentially blocking operations that require IO to complete (i.e.
taking a transaction reservation).
Hence the first time we go to do a DIO read an inode, it's going to
do an atime update, which now occurrs from an IOCB_NOWAIT context
and we return -EAGAIN....
Yes, we added non-blocking timestamp updates as part of the async
buffered write support, but this was a general XFS IO path change of
behaviour to address a potential blocking point in *all* IOCB_NOWAIT
reads and writes, buffered or direct.
The test is not validating that RWF_NOWAIT is behaving correctly - it
just was a simple operation that kinda exercised RWF_NOWAIT semantics
when we had no other way to test this code. It has outlived it's
original purpose, so it should be removed...
[1]https://lore.kernel.org/linux-xfs/b2865bd6-2346-8f4d-168b-17f06bbedbed@kernel.dk/
Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>
2 files changed
