| #!/bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved. |
| # |
| # FS QA Test No. btrfs/035 |
| # |
| # Regression test for overwriting clones |
| # |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| |
| _cleanup() |
| { |
| rm -f $tmp.* |
| } |
| |
| trap "_cleanup ; exit \$status" 0 1 2 3 15 |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| . ./common/filter.btrfs |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _require_scratch |
| _require_cloner |
| |
| _scratch_mkfs > /dev/null 2>&1 |
| _scratch_mount |
| |
| src_str="aaaaaaaaaa" |
| |
| echo -n "$src_str" > $SCRATCH_MNT/src |
| |
| $CLONER_PROG $SCRATCH_MNT/src $SCRATCH_MNT/src.clone1 |
| |
| src_str="bbbbbbbbbbcccccccccc" |
| |
| echo -n "$src_str" > $SCRATCH_MNT/src |
| |
| $CLONER_PROG $SCRATCH_MNT/src $SCRATCH_MNT/src.clone2 |
| |
| snap_src_sz=`ls -lah $SCRATCH_MNT/src.clone1 | awk '{print $5}'` |
| echo "attempting ioctl (src.clone1 src)" |
| $CLONER_PROG -s 0 -d 0 -l ${snap_src_sz} \ |
| $SCRATCH_MNT/src.clone1 $SCRATCH_MNT/src | _filter_btrfs_cloner_error |
| |
| # The clone operation should have failed. If it did not it meant we had data |
| # loss, because file "src.clone1" has an inline extent which is 10 bytes long |
| # while file "src" has an inline extent which is 20 bytes long. The clone |
| # operation would remove the inline extent of "src" and then copy the inline |
| # extent from "src.clone1" into "src", which means we would lose the last 10 |
| # bytes of data from "src" (on read we would get 0x00 as the value for any |
| # of those 10 bytes, because the file's size remains as 20 bytes). |
| echo "File src data after attempt to clone from src.clone1 into src:" |
| od -t x1 $SCRATCH_MNT/src |
| |
| snap_src_sz=`ls -lah $SCRATCH_MNT/src.clone2 | awk '{print $5}'` |
| echo "attempting ioctl (src.clone2 src)" |
| $CLONER_PROG -s 0 -d 0 -l ${snap_src_sz} \ |
| $SCRATCH_MNT/src.clone2 $SCRATCH_MNT/src |
| |
| # The clone operation should have succeeded. |
| echo "File src data after attempt to clone from src.clone2 into src:" |
| od -t x1 $SCRATCH_MNT/src |
| |
| status=0 ; exit |