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https://github.com/linux-apfs/apfstests.git
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Darrick J. Wong
0bfb84110b
Add a leading underscore to the get_block_size helper since it's a common function. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
124 lines
4.8 KiB
Bash
Executable File
124 lines
4.8 KiB
Bash
Executable File
#! /bin/bash
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# FSQA Test No. 098
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#
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# Test that if we fsync a file that got one extent partially cloned into a
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# lower file offset, after a power failure our file has the same content it
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# had before the power failure and after the extent cloning operation.
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#
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#-----------------------------------------------------------------------
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#
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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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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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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_cleanup_flakey
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/dmflakey
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_dm_target flakey
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_require_cloner
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_require_metadata_journaling $SCRATCH_DEV
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rm -f $seqres.full
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_scratch_mkfs >>$seqres.full 2>&1
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_init_flakey
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_mount_flakey
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BLOCK_SIZE=$(_get_block_size $SCRATCH_MNT)
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# Create our test file with a single 25 block extent starting at file offset
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# mapped by 200th block We fsync the file here to make the fsync log tree get a
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# single csum item that covers the whole 25 block extent, which causes the
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# second fsync, done after the cloning operation below, to not leave in the log
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# tree two csum items covering two block sub-ranges ([0, 5[ and [5, 25[)) of our
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# extent.
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$XFS_IO_PROG -f -c "pwrite -S 0xaa $((200 * $BLOCK_SIZE)) $((25 * $BLOCK_SIZE))" \
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-c "fsync" \
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$SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified
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# Now clone part of our extent into file offset mapped by 100th block. This adds
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# a file extent item to our inode's metadata that points to the 25 block extent
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# we created before, using a data offset of 5 blocks and a data length of 5
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# blocks, so that it refers to the block sub-range [5, 10[ of our original
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# extent.
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$CLONER_PROG -s $(((200 * $BLOCK_SIZE) + (5 * $BLOCK_SIZE))) \
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-d $((100 * $BLOCK_SIZE)) -l $((5 * $BLOCK_SIZE)) \
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$SCRATCH_MNT/foo $SCRATCH_MNT/foo
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# Now fsync our file to make sure the extent cloning is durably persisted. This
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# fsync will not add a second csum item to the log tree containing the checksums
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# for the blocks in the block sub-range [5, 10[ of our extent, because there was
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# already a csum item in the log tree covering the whole extent, added by the
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# first fsync we did before.
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$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo
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echo "File contents before power failure:"
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od -t x1 $SCRATCH_MNT/foo | _filter_od
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# The fsync log replay first processes the file extent item corresponding to the
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# file offset mapped by 100th block (the one which refers to the [5, 10[ block
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# sub-range of our 25 block extent) and then processes the file extent item for
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# file offset mapped by 200th block. It used to happen that when processing the
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# later, it erroneously left in the csum tree 2 csum items that overlapped each
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# other, 1 for the block sub-range [5, 10[ and 1 for the whole range of our
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# extent. This introduced a problem where subsequent lookups for the checksums
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# of blocks within the block range [10, 25[ of our extent would not find
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# anything because lookups in the csum tree ended up looking only at the smaller
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# csum item, the one covering the block subrange [5, 10[. This made read
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# requests assume an expected checksum with a value of 0 for those blocks, which
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# caused checksum verification failure when the read operations finished.
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# However those checksum failure did not result in read requests returning an
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# error to user space (like -EIO for e.g.) because the expected checksum value
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# had the special value 0, and in that case btrfs set all bytes of the
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# corresponding pages with the value 0x01 and produce the following warning in
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# dmesg/syslog:
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#
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# "BTRFS warning (device dm-0): csum failed ino 257 off 917504 csum 1322675045\
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# expected csum 0"
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#
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_flakey_drop_and_remount
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echo "File contents after log replay:"
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# Must match the file contents we had after cloning the extent and before
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# the power failure happened.
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od -t x1 $SCRATCH_MNT/foo | _filter_od
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_unmount_flakey
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status=0
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exit
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