tests/cp/sparse-fiemap

   1 #!/bin/sh
   2 # Test cp --sparse=always through fiemap copy
   3
   4 # Copyright (C) 2010-2011 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  20 print_ver_ cp
  21
  22 # Note we don't check a file here as that could enable
  23 # the test on ext3 where this test is seen to fail.
  24 if fiemap_capable_ . ; then
  25   : # Current dir is on a partition with working extents.  Good!
  26 else
  27   # It's not;  we need to create one, hence we need root access.
  28   require_root_
  29
  30   cwd=$PWD
  31   cleanup_() { cd /; umount "$cwd/mnt"; }
  32
  33   skip=0
  34   # Create an ext4 loopback file system
  35   dd if=/dev/zero of=blob bs=32k count=1000 || skip=1
  36   mkdir mnt
  37   mkfs -t ext4 -F blob ||
  38     skip_test_ "failed to create ext4 file system"
  39   mount -oloop blob mnt   || skip=1
  40   cd mnt                  || skip=1
  41   echo test > f           || skip=1
  42   test -s f               || skip=1
  43
  44   test $skip = 1 &&
  45     skip_test_ "insufficient mount/ext4 support"
  46 fi
  47
  48 # =================================================
  49 # Ensure that we exercise the FIEMAP-copying code enough
  50 # to provoke at least two iterations of the do...while loop
  51 # in which it calls ioctl (fd, FS_IOC_FIEMAP,...
  52 # This also verifies that non-trivial extents are preserved.
  53
  54 $PERL -e 1 || skip_test_ 'skipping part of this test; you lack perl'
  55
  56 # Extract logical block number and length pairs from filefrag -v output.
  57 # The initial sed is to remove the "eof" from the normally-empty "flags" field.
  58 # Similarly, remove flags values like "unknown,delalloc,eof".
  59 # That is required when that final extent has no number in the "expected" field.
  60 f()
  61 {
  62   sed 's/ [a-z,][a-z,]*$//' $@ \
  63     | awk '/^ *[0-9]/ {printf "%d %d ", $2 ,NF < 5 ? $NF : $5 } END {print ""}'
  64 }
  65
  66 for i in $(seq 1 2 21); do
  67   for j in 1 2 31 100; do
  68     $PERL -e 'BEGIN { $n = '$i' * 1024; *F = *STDOUT }' \
  69           -e 'for (1..'$j') { sysseek (*F, $n, 1)' \
  70           -e '&& syswrite (*F, chr($_)x$n) or die "$!"}' > j1 || fail=1
  71
  72     # Note the explicit fdatasync is used here as
  73     # it was seen that `filefrag -s` (FIEMAP_FLAG_SYNC) was
  74     # ineffective on ext4 loopback on Linux 2.6.35.10-72.fc14.i686
  75     dd if=/dev/null of=j1 conv=notrunc,fdatasync
  76     cp --sparse=always j1 j2 || fail=1
  77     dd if=/dev/null of=j2 conv=notrunc,fdatasync
  78
  79     cmp j1 j2 || fail=1
  80     filefrag -v j1 | grep extent \
  81       || skip_test_ 'skipping part of this test; you lack filefrag'
  82
  83     # Here is sample filefrag output:
  84     #   $ perl -e 'BEGIN{$n=16*1024; *F=*STDOUT}' \
  85     #          -e 'for (1..5) { sysseek(*F,$n,1)' \
  86     #          -e '&& syswrite *F,"."x$n or die "$!"}' > j
  87     #   $ filefrag -v j
  88     #   File system type is: ef53
  89     #   File size of j is 163840 (40 blocks, blocksize 4096)
  90     #    ext logical physical expected length flags
  91     #      0       4  6258884               4
  92     #      1      12  6258892  6258887      4
  93     #      2      20  6258900  6258895      4
  94     #      3      28  6258908  6258903      4
  95     #      4      36  6258916  6258911      4 eof
  96     #   j: 6 extents found
  97
  98     # exclude the physical block numbers; they always differ
  99     filefrag -v j1 > ff1 || fail=1
 100     filefrag -v j2 > ff2 || fail=1
 101     { f ff1; f ff2; } \
 102       | $PERL $abs_top_srcdir/tests/filefrag-extent-compare \
 103         || { fail=1; break; }
 104   done
 105   test $fail = 1 && break
 106 done
 107
 108 Exit $fail