mirror of
https://github.com/linux-apfs/apfstests.git
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Filipe Manana
a38e45b19d
This test currently always fails on btrfs:
generic/471 2s ... - output mismatch (see ...results//generic/471.out.bad)
--- tests/generic/471.out 2020-06-10 19:29:03.850519863 +0100
+++ /home/fdmanana/git/hub/xfstests/results//generic/471.out.bad ...
@@ -2,12 +2,10 @@
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
This is because btrfs is a COW filesystem and an attempt to write into a
previously written file range allocating a new extent (or multiple).
The only exceptions are when attempting to write to a file range with a
preallocated/unwritten extent or when writing to a NOCOW file that has
extents allocated in the target range already.
The test currently expects that writing into a previously written file
range succeeds, but that is not true on btrfs since we are not dealing
with a NOCOW file. So to make the test pass on btrfs, set the NOCOW bit
on the file when the filesystem is btrfs.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
73 lines
2.1 KiB
Bash
Executable File
73 lines
2.1 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017, SUSE Linux Products. All Rights Reserved.
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#
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# FS QA Test No. 471
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#
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# write a file with RWF_NOWAIT and it would fail because there are no
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# blocks allocated. Create a file with direct I/O and re-write it
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# using RWF_NOWAIT. I/O should finish within 50 microsecods since
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# block allocations are already performed.
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/populate
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. ./common/filter
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. ./common/attr
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# real QA test starts here
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_supported_os Linux
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_require_odirect
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_require_test
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_require_xfs_io_command pwrite -N
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# Remove reminiscence of previously run tests
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testdir=$TEST_DIR/$seq
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if [ -e $testdir ]; then
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rm -Rf $testdir
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fi
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mkdir $testdir
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# Btrfs is a COW filesystem, so a RWF_NOWAIT write will always fail with -EAGAIN
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# when writing to a file range except if it's a NOCOW file and an extent for the
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# range already exists or if it's a COW file and preallocated/unwritten extent
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# exists in the target range. So to make sure that the last write succeeds on
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# all filesystems, use a NOCOW file on btrfs.
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if [ $FSTYP == "btrfs" ]; then
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_require_chattr C
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touch $testdir/f1
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$CHATTR_PROG +C $testdir/f1
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fi
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# Create a file with pwrite nowait (will fail with EAGAIN)
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$XFS_IO_PROG -f -d -c "pwrite -N -V 1 -b 1M 0 1M" $testdir/f1
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# Write the file without nowait
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$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -W -w -V 1 -b 1M 0 8M" $testdir/f1 | _filter_xfs_io
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time_taken=`$XFS_IO_PROG -d -c "pwrite -S 0xbb -N -V 1 -b 1M 2M 1M" $testdir/f1 | awk '/^1/ {print $5}'`
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# RWF_NOWAIT should finish within a short period of time so we are choosing
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# a conservative value of 50 ms. Anything longer means it is waiting
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# for something in the kernel which would be a fail.
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if (( $(echo "$time_taken < 0.05" | bc -l) )); then
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echo "RWF_NOWAIT time is within limits."
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else
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echo "RWF_NOWAIT took $time_taken seconds"
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fi
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$XFS_IO_PROG -c "pread -v 0 8M" $testdir/f1 | _filter_xfs_io_unique
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# success, all done
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status=0
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exit
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