| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved. |
| # |
| # FS QA Test No. btrfs/226 |
| # |
| # Test several (btrfs specific) scenarios with RWF_NOWAIT writes, cases where |
| # they should fail and cases where they should succeed. |
| # |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _require_scratch_reflink |
| _require_chattr C |
| _require_odirect |
| _require_xfs_io_command pwrite -N |
| _require_xfs_io_command falloc -k |
| _require_xfs_io_command fpunch |
| |
| rm -f $seqres.full |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| # Test a write against COW file/extent - should fail with -EAGAIN. Disable the |
| # NOCOW attribute of the file just in case MOUNT_OPTIONS has "-o nodatacow". |
| echo "Testing write against COW file" |
| touch $SCRATCH_MNT/f1 |
| $CHATTR_PROG -C $SCRATCH_MNT/f1 |
| $XFS_IO_PROG -s -c "pwrite -S 0xab 0 128K" $SCRATCH_MNT/f1 | _filter_xfs_io |
| $XFS_IO_PROG -d -c "pwrite -N -V 1 -S 0xff 32K 64K" $SCRATCH_MNT/f1 |
| |
| # Check no data was written. |
| echo "File data after write attempt:" |
| od -A d -t x1 $SCRATCH_MNT/f1 |
| |
| # Create a file with two extents (NOCOW), then create a snapshot, unshare the |
| # first extent by writing to it without RWF_NOWAIT, and then attempt to write |
| # to a file range that includes both the non-shared and the shared extent - |
| # should fail with -EAGAIN. |
| echo |
| echo "Testing write against extent shared across snapshots" |
| touch $SCRATCH_MNT/f2 |
| $CHATTR_PROG +C $SCRATCH_MNT/f2 |
| $XFS_IO_PROG -s -c "pwrite -S 0xab 0 64K" \ |
| -c "pwrite -S 0xcd 64K 64K" \ |
| $SCRATCH_MNT/f2 | _filter_xfs_io |
| |
| $BTRFS_UTIL_PROG subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap \ |
| | _filter_scratch |
| |
| # Write into the range of the first extent so that that range no longer has a |
| # shared extent. |
| $XFS_IO_PROG -s -c "pwrite -S 0xab 0 64K" $SCRATCH_MNT/f2 | _filter_xfs_io |
| |
| # Attempt to write into the file range, using RWF_NOWAIT, that covers the |
| # non-shared and the shared extents, should fail. |
| $XFS_IO_PROG -d -c "pwrite -N -V 1 -S 0xff -b 64K 32K 64K" $SCRATCH_MNT/f2 |
| |
| # Check no data was written. |
| echo "File data after write attempt:" |
| od -A d -t x1 $SCRATCH_MNT/f2 |
| |
| # Create a file that has an extent shared with file f2. Attempting to write |
| # into a range that covers the shared extent should fail with -EAGAIN. |
| echo |
| echo "Testing write against shared extent through reflink" |
| touch $SCRATCH_MNT/f3 |
| $CHATTR_PROG +C $SCRATCH_MNT/f3 |
| $XFS_IO_PROG -s -c "pwrite -S 0xab -b 64K 0 64K" \ |
| -c "reflink $SCRATCH_MNT/f2 64K 64K 64K" \ |
| $SCRATCH_MNT/f3 | _filter_xfs_io |
| |
| # Should fail, range 64K to 96K has a shared extent. |
| $XFS_IO_PROG -d -c "pwrite -N -V 1 -S 0xff -b 64K 32K 64K" $SCRATCH_MNT/f3 |
| |
| # Check no data was written. |
| echo "File data after write attempt:" |
| od -A d -t x1 $SCRATCH_MNT/f3 |
| |
| # Create a file with a prealloc extent at eof and attempt to write to it, it |
| # should succeed. |
| echo |
| echo "Testing write against prealloc extent at eof" |
| $XFS_IO_PROG -f -s -c "pwrite -S 0xab 0 64K" \ |
| -c "falloc -k 64K 64K" \ |
| $SCRATCH_MNT/f4 | _filter_xfs_io |
| |
| # Should succeed. |
| $XFS_IO_PROG -d -c "pwrite -N -V 1 -S 0xcd -b 64K 64K 64K" $SCRATCH_MNT/f4 \ |
| | _filter_xfs_io |
| |
| # Check the file has the expected data. |
| echo "File after write:" |
| od -A d -t x1 $SCRATCH_MNT/f4 |
| |
| # Attempts to write to ranges that have a hole, should fail with -EAGAIN. |
| echo |
| echo "Testing writes against ranges with holes" |
| touch $SCRATCH_MNT/f5 |
| $CHATTR_PROG +C $SCRATCH_MNT/f5 |
| # 3 64Kb extents, with a 64K hole at offset 128K. |
| $XFS_IO_PROG -s -d -c "pwrite -S 0xab -b 64K 0 64K" \ |
| -s -d -c "pwrite -S 0xcd -b 64K 64K 64K" \ |
| -s -d -c "pwrite -S 0xef -b 64K 192K 64K" \ |
| $SCRATCH_MNT/f5 | _filter_xfs_io |
| |
| # Should fail, second half of the range maps to a hole. |
| $XFS_IO_PROG -d -c "pwrite -N -V 1 -S 0x11 -b 128K 64K 128K" $SCRATCH_MNT/f5 |
| |
| # Now try with a range that starts with a hole and ends with an extent, should |
| # fail as well. |
| $XFS_IO_PROG -c "fpunch 0 64K" \ |
| -d -c "pwrite -N -V 1 -S 0x22 -b 128K 0 128K" \ |
| $SCRATCH_MNT/f5 |
| |
| # Check no data was written. |
| echo "File data after write attempt:" |
| od -A d -t x1 $SCRATCH_MNT/f5 |
| |
| status=0 |
| exit |