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# Test cp --sparse=always through fiemap copy
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# Copyright (C) 2010-2011 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will 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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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/init.sh"; path_prepend_ ../src
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$PERL -e 1 || skip_ 'you lack perl'
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# The test was seen to fail on ext3 so exclude that type
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# (or any file system where the type can't be determined)
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if fiemap_capable_ fiemap_chk && ! df -t ext3 . >/dev/null; then
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: # Current partition has working extents. Good!
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# FIXME: temporarily(?) skip this variant, at least until after this bug
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# is fixed: http://thread.gmane.org/gmane.comp.file-systems.ext4/24495
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skip_ "current file system has insufficient FIEMAP support"
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# It's not; we need to create one, hence we need root access.
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cleanup_() { cd /; umount "$cwd/mnt"; }
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# Create an ext4 loopback file system
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dd if=/dev/zero of=blob bs=32k count=1000 || skip=1
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mkfs -t ext4 -F blob ||
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skip_ "failed to create ext4 file system"
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mount -oloop blob mnt || skip=1
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echo test > f || skip=1
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skip_ "insufficient mount/ext4 support"
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# =================================================
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# Ensure that we exercise the FIEMAP-copying code enough
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# to provoke at least two iterations of the do...while loop
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# in which it calls ioctl (fd, FS_IOC_FIEMAP,...
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# This also verifies that non-trivial extents are preserved.
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# Extract logical block number and length pairs from filefrag -v output.
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# The initial sed is to remove the "eof" from the normally-empty "flags" field.
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# Similarly, remove flags values like "unknown,delalloc,eof".
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# That is required when that final extent has no number in the "expected" field.
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sed 's/ [a-z,][a-z,]*$//' $@ \
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| awk '/^ *[0-9]/ {printf "%d %d ", $2, (NF<5 ? $NF : $5) } END {print ""}'
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for i in $(seq 1 2 21); do
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for j in 1 2 31 100; do
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$PERL -e '$n = '$i' * 1024; *F = *STDOUT;' \
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-e 'for (1..'$j') { sysseek (*F, $n, 1)' \
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-e '&& syswrite (*F, chr($_)x$n) or die "$!"}' > j1 || fail=1
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# Note there is an implicit sync performed by cp on Linux kernels
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# before 2.6.39 to work around bugs in EXT4 and BTRFS.
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# Note also the -s parameter to the filefrag commands below
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# for the same reasons.
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cp --sparse=always j1 j2 || fail=1
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cmp j1 j2 || fail_ "data loss i=$i j=$j"
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if ! filefrag -vs j1 | grep -F extent >/dev/null; then
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test $skip != 1 && warn_ 'skipping part; you lack filefrag'
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# Here is sample filefrag output:
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# $ perl -e 'BEGIN{$n=16*1024; *F=*STDOUT}' \
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# -e 'for (1..5) { sysseek(*F,$n,1)' \
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# -e '&& syswrite *F,"."x$n or die "$!"}' > j
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# File system type is: ef53
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# File size of j is 163840 (40 blocks, blocksize 4096)
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# ext logical physical expected length flags
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# 1 12 6258892 6258887 4
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# 2 20 6258900 6258895 4
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# 3 28 6258908 6258903 4
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# 4 36 6258916 6258911 4 eof
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# exclude the physical block numbers; they always differ
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filefrag -v j1 > ff1 || framework_failure_
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filefrag -vs j2 > ff2 || framework_failure_
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{ f ff1; f ff2; } | $PERL $abs_top_srcdir/tests/filefrag-extent-compare \
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warn_ ignoring filefrag-reported extent map differences
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# Show the differing extent maps.
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test $fail = 1 && break 2
added
removed
tests/cp/sparse-fiemap
