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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FSQA Test No. 098
#
# Test that after truncating a file into the middle of a hole causes the new
# size of the file to be persisted after a clean unmount of the filesystem (or
# after the inode is evicted). This is for the case where all the data following
# the hole is not yet durably persisted, that is, that data is only present in
# the page cache.
#
# This test is motivated by an issue found in btrfs.
#
. ./common/preamble
_begin_fstest auto quick metadata
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs generic
_require_scratch
# This test was motivated by an issue found in btrfs when the btrfs no-holes
# feature is enabled (introduced in kernel 3.14). So enable the feature if the
# fs being tested is btrfs.
if [ $FSTYP == "btrfs" ]; then
_require_btrfs_fs_feature "no_holes"
_require_btrfs_mkfs_feature "no-holes"
MKFS_OPTIONS="$MKFS_OPTIONS -O no-holes"
fi
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
workout()
{
local need_sync=$1
# Create our test file with some data and durably persist it.
$XFS_IO_PROG -t -f -c "pwrite -S 0xaa 0 128K" $SCRATCH_MNT/foo | _filter_xfs_io
sync
# Append some data to the file, increasing its size, and leave a hole between
# the old size and the start offset if the following write. So our file gets
# a hole in the range [128Kb, 256Kb[.
$XFS_IO_PROG -c "pwrite -S 0xbb 256K 32K" $SCRATCH_MNT/foo | _filter_xfs_io
# This 'sync' is to flush file extent on disk and update on-disk inode size.
# This is required to trigger a bug in btrfs truncate where it updates on-disk
# inode size incorrectly.
if [ $need_sync -eq 1 ]; then
sync
fi
# Now truncate our file to a smaller size that is in the middle of the hole we
# previously created.
# If we don't flush dirty page cache above, on most truncate
# implementations the data we appended before gets discarded from
# memory (with truncate_setsize()) and never ends up being written to
# disk.
$XFS_IO_PROG -c "truncate 160K" $SCRATCH_MNT/foo
_scratch_cycle_mount
# We expect to see a file with a size of 160Kb, with the first 128Kb of data all
# having the value 0xaa and the remaining 32Kb of data all having the value 0x00
echo "File content after remount:"
od -t x1 $SCRATCH_MNT/foo
}
workout 0
# flush after each write
workout 1
status=0
exit
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