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|
#!/bin/sh
# Test cp --sparse=always through fiemap copy
# Copyright (C) 2010-2012 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 <http://www.gnu.org/licenses/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ cp
$PERL -e 1 || skip_ 'you lack perl'
# The test was seen to fail on ext3 so exclude that type
# (or any file system where the type can't be determined)
touch fiemap_chk
if fiemap_capable_ fiemap_chk && ! df -t ext3 . >/dev/null; then
: # Current partition has working extents. Good!
else
# FIXME: temporarily(?) skip this variant, at least until after this bug
# is fixed: http://thread.gmane.org/gmane.comp.file-systems.ext4/24495
skip_ "current file system has insufficient FIEMAP support"
# It's not; we need to create one, hence we need root access.
require_root_
cwd=$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<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_top_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
|
