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Diffstat (limited to 'tests/cp/sparse-fiemap.sh')
| -rwxr-xr-x | tests/cp/sparse-fiemap.sh | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/tests/cp/sparse-fiemap.sh b/tests/cp/sparse-fiemap.sh new file mode 100755 index 0000000..61f9fd2 --- /dev/null +++ b/tests/cp/sparse-fiemap.sh @@ -0,0 +1,115 @@ +#!/bin/sh +# Test cp --sparse=always through fiemap copy + +# Copyright (C) 2010-2018 Free Software Foundation, Inc. + +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <https://www.gnu.org/licenses/>. + +. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src +print_ver_ cp +require_perl_ + +# The test was seen to fail on ext3 so exclude that type +# (or any file system where the type can't be determined) +touch fiemap_chk +if fiemap_capable_ fiemap_chk && ! df -t ext3 . >/dev/null; then + : # Current partition has working extents. Good! +else + skip_ "current file system has insufficient FIEMAP support" + + # It's not; we need to create one, hence we need root access. + require_root_ + + cwd=$PWD + cleanup_() { cd /; umount "$cwd/mnt"; } + + skip=0 + # Create an ext4 loopback file system + dd if=/dev/zero of=blob bs=32k count=1000 || skip=1 + mkdir mnt + mkfs -t ext4 -F blob || + skip_ "failed to create ext4 file system" + mount -oloop blob mnt || skip=1 + cd mnt || skip=1 + echo test > f || skip=1 + test -s f || skip=1 + + test $skip = 1 && + skip_ "insufficient mount/ext4 support" +fi + +# ================================================= +# Ensure that we exercise the FIEMAP-copying code enough +# to provoke at least two iterations of the do...while loop +# in which it calls ioctl (fd, FS_IOC_FIEMAP,... +# This also verifies that non-trivial extents are preserved. + +# Extract logical block number and length pairs from filefrag -v output. +# The initial sed is to remove the "eof" from the normally-empty "flags" field. +# Similarly, remove flags values like "unknown,delalloc,eof". +# That is required when that final extent has no number in the "expected" field. +f() +{ + sed 's/ [a-z,][a-z,]*$//' $@ \ + | $AWK '/^ *[0-9]/ {printf "%d %d ", $2, (NF>=6 ? $6 : (NF<5 ? $NF : $5)) } + END {print ""}' +} + +for i in $(seq 1 2 21); do + for j in 1 2 31 100; do + $PERL -e '$n = '$i' * 1024; *F = *STDOUT;' \ + -e 'for (1..'$j') { sysseek (*F, $n, 1)' \ + -e '&& syswrite (*F, chr($_)x$n) or die "$!"}' > j1 || fail=1 + + # Note there is an implicit sync performed by cp on Linux kernels + # before 2.6.39 to work around bugs in EXT4 and BTRFS. + # Note also the -s parameter to the filefrag commands below + # for the same reasons. + cp --sparse=always j1 j2 || fail=1 + + cmp j1 j2 || fail_ "data loss i=$i j=$j" + if ! filefrag -vs j1 | grep -F extent >/dev/null; then + test $skip != 1 && warn_ 'skipping part; you lack filefrag' + skip=1 + else + # Here is sample filefrag output: + # $ perl -e 'BEGIN{$n=16*1024; *F=*STDOUT}' \ + # -e 'for (1..5) { sysseek(*F,$n,1)' \ + # -e '&& syswrite *F,"."x$n or die "$!"}' > j + # $ filefrag -v j + # File system type is: ef53 + # File size of j is 163840 (40 blocks, blocksize 4096) + # ext logical physical expected length flags + # 0 4 6258884 4 + # 1 12 6258892 6258887 4 + # 2 20 6258900 6258895 4 + # 3 28 6258908 6258903 4 + # 4 36 6258916 6258911 4 eof + # j: 6 extents found + + # exclude the physical block numbers; they always differ + filefrag -v j1 > ff1 || framework_failure_ + filefrag -vs j2 > ff2 || framework_failure_ + { f ff1; f ff2; } | $PERL $abs_srcdir/tests/filefrag-extent-compare \ + || { + warn_ ignoring filefrag-reported extent map differences + # Show the differing extent maps. + head -n99 ff1 ff2 + } + fi + test $fail = 1 && break 2 + done +done + +Exit $fail |