tests/cp/fiemap-empty

   1 #!/bin/sh
   2 # Test cp reads unwritten extents efficiently
   3
   4 # Copyright (C) 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 touch fiemap_chk
  23 fiemap_capable_ fiemap_chk ||
  24   skip_test_ 'this file system lacks FIEMAP support'
  25 rm fiemap_chk
  26
  27 # TODO: rather than requiring `fallocate`, possible add
  28 # this functionality to truncate --alloc
  29 fallocate --help >/dev/null || skip_test_ 'The fallocate utility is required'
  30 fallocate -l 1 -n falloc.test ||
  31   skip_test_ 'this file system lacks FALLOCATE support'
  32 rm falloc.test
  33
  34 # Require more space than we'll actually use, so that
  35 # tests run in parallel do not run out of space.
  36 # Otherwise, with inadequate space, simply running the following
  37 # fallocate command would induce a temporary disk-full condition,
  38 # which would cause failure of unrelated tests run in parallel.
  39 require_file_system_bytes_free_ 800000000
  40
  41 fallocate -l 600000000 space.test ||
  42   skip_test_ 'this test needs at least 600MB free space'
  43
  44 # Disable this test on old BTRFS (e.g. Fedora 14)
  45 # which reports ordinary extents for unwritten ones.
  46 filefrag space.test || skip_test_ 'the `filefrag` utility is missing'
  47 filefrag -v space.test | grep -F 'unwritten' > /dev/null ||
  48   skip_test_ 'this file system does not report empty extents as "unwritten"'
  49
  50 rm space.test
  51
  52 # Ensure we read a large empty file quickly
  53 fallocate -l 300000000 empty.big || framework_failure
  54 timeout 3 cp --sparse=always empty.big cp.test || fail=1
  55 test $(stat -c %s empty.big) = $(stat -c %s cp.test) || fail=1
  56 rm empty.big cp.test
  57
  58 # Ensure we handle extents beyond file size correctly.
  59 # Note until we support fallocate, we will not maintain
  60 # the file allocation.  FIXME: amend this test when fallocate is supported.
  61 fallocate -l 10000000 -n unwritten.withdata || framework_failure
  62 dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unwritten.withdata
  63 cp unwritten.withdata cp.test || fail=1
  64 test $(stat -c %s unwritten.withdata) = $(stat -c %s cp.test) || fail=1
  65 cmp unwritten.withdata cp.test || fail=1
  66 rm unwritten.withdata cp.test
  67
  68 # The following to generate unaccounted extents followed by a hole, is not
  69 # supported by ext4 at least. The ftruncate discards all extents not
  70 # accounted for in the size.
  71 #  fallocate -l 10000000 -n unacc.withholes
  72 #  dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unacc.withholes
  73 #  truncate -s20000000 unacc.withholes
  74
  75 # Ensure we handle a hole after empty extents correctly.
  76 # Since all extents are accounted for in the size,
  77 # we can maintain the allocation independently from
  78 # fallocate() support.
  79 fallocate -l 10000000 empty.withholes
  80 truncate -s 20000000 empty.withholes
  81 sectors_per_block=$(expr $(stat -c %o .) / 512)
  82 cp empty.withholes cp.test || fail=1
  83 test $(stat -c %s empty.withholes) = $(stat -c %s cp.test) || fail=1
  84 # These are usually equal but can vary by an IO block due to alignment
  85 alloc_diff=$(expr $(stat -c %b empty.withholes) - $(stat -c %b cp.test))
  86 alloc_diff=$(echo $alloc_diff | tr -d -- -) # abs()
  87 test $alloc_diff -le $sectors_per_block || fail=1
  88 # Again with SPARSE_ALWAYS
  89 cp --sparse=always empty.withholes cp.test || fail=1
  90 test $(stat -c %s empty.withholes) = $(stat -c %s cp.test) || fail=1
  91 # cp.test should take 0 space, but allowing for some systems
  92 # that store default extended attributes in data blocks
  93 test $(stat -c %b cp.test) -le $sectors_per_block || fail=1
  94 rm empty.withholes cp.test
  95
  96 Exit $fail