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btrfs-progs: tests: Test for FST corruption detection/repair

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Simple test case which preps a filesystem, then corrupts the FST and
finally repairs it. Tests both extent based and bitmap based FSTs.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-10-01 17:46:20 +03:00 committed by David Sterba
parent be32eb0557
commit 1cf5833aa6
1 changed files with 76 additions and 0 deletions
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tests/fsck-tests/037-freespacetree-repair/test.sh Executable file
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#!/bin/bash
# Corrupt a filesystem that is using freespace tree and then ensure that
# btrfs check is able to repair it. This tests correct detection/repair of
# both a FREE_SPACE_EXTENT based FST and a FREE_SPACE_BITMAP based FST.
source "$TEST_TOP/common"
setup_root_helper
prepare_test_dev 256M
check_prereq btrfs
check_prereq mkfs.btrfs
check_global_prereq grep
check_global_prereq tail
check_global_prereq head
check_global_prereq cut
# wrapper for btrfs-corrupt-item
# $1: Type of item we want to corrupt - extent or bitmap
corrupt_fst_item()
{
local type
local objectid
local offset
type="$1"
if [[ $type == "bitmap" ]]; then
type=200
objectid=$("$TOP/btrfs" inspect-internal dump-tree -t 10 "$TEST_DEV" | \
grep -o "[[:digit:]]* FREE_SPACE_BITMAP [[:digit:]]*" | \
cut -d' ' -f1 | tail -2 | head -1)
offset=$("$TOP/btrfs" inspect-internal dump-tree -t 10 "$TEST_DEV" | \
grep -o "[[:digit:]]* FREE_SPACE_BITMAP [[:digit:]]*" | \
cut -d' ' -f3 | tail -2 | head -1)
echo "Corrupting $objectid,FREE_SPACE_BITMAP,$offset" >> "$RESULTS"
elif [[ $type == "extent" ]]; then
type=199
objectid=$("$TOP/btrfs" inspect-internal dump-tree -t 10 "$TEST_DEV" | \
grep -o "[[:digit:]]* FREE_SPACE_EXTENT [[:digit:]]*" | \
cut -d' ' -f1 | tail -2 | head -1)
offset=$("$TOP/btrfs" inspect-internal dump-tree -t 10 "$TEST_DEV" | \
grep -o "[[:digit:]]* FREE_SPACE_EXTENT [[:digit:]]*" | \
cut -d' ' -f3 | tail -2 | head -1)
echo "Corrupting $objectid,FREE_SPACE_EXTENT,$offset" >> "$RESULTS"
else
_fail "Unknown item type for corruption"
fi
run_check "$TOP/btrfs-corrupt-block" -r 10 -K "$objectid,$type,$offset" \
-f offset "$TEST_DEV"
}
run_check "$TOP/mkfs.btrfs" -n 4k -f "$TEST_DEV"
run_check_mount_test_dev -oclear_cache,space_cache=v2
# create files which will populate the FST
for i in {1..3000}; do
run_check $SUDO_HELPER fallocate -l 4k "$TEST_MNT/file.$i"
done
run_check_umount_test_dev
# now corrupt one of the bitmap items
corrupt_fst_item "bitmap"
check_image "$TEST_DEV"
# change the freespace such that we now have at least one free_space_extent
# object
run_check_mount_test_dev
rm -rf "$TEST_MNT/file.*"
run_check $SUDO_HELPER fallocate -l 50m "$TEST_MNT/file"
run_check_umount_test_dev
# now corrupt an extent
corrupt_fst_item "extent"
check_image "$TEST_DEV"