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generic: test for fsync after file truncations
Test that if we truncate a file to a smaller size, then truncate it to its original size or a larger size, then fsyncing it and a power failure happens, the file will have the range [first_truncate_size, last_size[ with all bytes having a value of 0x00 if we read it the next time the filesystem is mounted. This test is motivated by a bug found in btrfs, which is fixed by a patch titled: "Btrfs: fix fsync after truncate when no_holes feature is enabled" Tested against ext3/4, xfs, btrfs (with and without the fix, and with the no_holes feature disabled), f2fs, reiserfs and nilfs2. All filesystems pass the test except for unpatched btrfs with the no_holes feature enabled (as expected) and f2fs. Both produce the following file contents that differ from the golden output: File foo content after log replay: 0000000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa * 0200000 bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb * 0372000 File bar content after log replay: 0000000 ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee * 0200000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff * 0372000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 * 0772000 Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Filipe Manana
committed by
Dave Chinner
Dave Chinner
parent
43b3882db9
commit
9dcfb88ac6
Executable
+117
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#! /bin/bash
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# FSQA Test No. 101
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#
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# Test that if we truncate a file to a smaller size, then truncate it to its
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# original size or a larger size, then fsyncing it and a power failure happens,
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# the file will have the range [first_truncate_size, last_size[ with all bytes
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# having a value of 0x00 if we read it the next time the filesystem is mounted.
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#
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# This test is motivated by a bug found in btrfs.
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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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_need_to_be_root
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_supported_fs generic
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_supported_os Linux
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_require_scratch
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_require_dm_flakey
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_require_metadata_journaling $SCRATCH_DEV
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# This test was motivated by an issue found in btrfs when the btrfs no-holes
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# feature is enabled (introduced in kernel 3.14). So enable the feature if the
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# fs being tested is btrfs.
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if [ $FSTYP == "btrfs" ]; then
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_require_btrfs_fs_feature "no_holes"
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_require_btrfs_mkfs_feature "no-holes"
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MKFS_OPTIONS="$MKFS_OPTIONS -O no-holes"
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fi
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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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# Create our test files and make sure everything is durably persisted.
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$XFS_IO_PROG -f -c "pwrite -S 0xaa 0 64K" \
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-c "pwrite -S 0xbb 64K 61K" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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$XFS_IO_PROG -f -c "pwrite -S 0xee 0 64K" \
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-c "pwrite -S 0xff 64K 61K" \
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$SCRATCH_MNT/bar | _filter_xfs_io
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sync
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# Now truncate our file foo to a smaller size (64Kb) and then truncate it to the
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# size it had before the shrinking truncate (125Kb). Then fsync our file. If a
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# power failure happens after the fsync, we expect our file to have a size of
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# 125Kb, with the first 64Kb of data having the value 0xaa and the second 61Kb
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# of data having the value 0x00.
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$XFS_IO_PROG -c "truncate 64K" \
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-c "truncate 125K" \
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-c "fsync" \
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$SCRATCH_MNT/foo
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# Do something similar to our file bar, but the first truncation sets the file
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# size to 0 and the second truncation expands the size to the double of what it
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# was initially.
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$XFS_IO_PROG -c "truncate 0" \
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-c "truncate 253K" \
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-c "fsync" \
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$SCRATCH_MNT/bar
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_load_flakey_table $FLAKEY_DROP_WRITES
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_unmount_flakey
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# Allow writes again, mount to trigger log replay and validate file contents.
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_load_flakey_table $FLAKEY_ALLOW_WRITES
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_mount_flakey
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# We expect foo to have a size of 125Kb, the first 64Kb of data all having the
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# value 0xaa and the remaining 61Kb to be a hole (all bytes with value 0x00).
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echo "File foo content after log replay:"
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od -t x1 $SCRATCH_MNT/foo
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# We expect bar to have a size of 253Kb and no extents (any byte read from bar
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# has the value 0x00).
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echo "File bar content after log replay:"
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od -t x1 $SCRATCH_MNT/bar
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status=0
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exit
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@@ -0,0 +1,19 @@
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QA output created by 101
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wrote 65536/65536 bytes at offset 0
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 62464/62464 bytes at offset 65536
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 0
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 62464/62464 bytes at offset 65536
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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File foo content after log replay:
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0000000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa
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*
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0200000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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*
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0372000
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File bar content after log replay:
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0000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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*
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0772000
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@@ -103,6 +103,7 @@
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098 auto quick metadata
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099 udf auto
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100 udf auto
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101 auto quick metadata
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105 acl auto quick
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112 rw aio auto quick
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113 rw aio auto quick
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