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 # FIXME: enable any part of this test that is still relevant,
  23 # or, if none are relevant (now that cp does not handle unwritten
  24 # extents), just remove the test altogether.
  25 skip_ 'disabled for now'
  26
  27 touch fiemap_chk
  28 fiemap_capable_ fiemap_chk ||
  29   skip_ 'this file system lacks FIEMAP support'
  30 rm fiemap_chk
  31
  32 # TODO: rather than requiring `fallocate`, possible add
  33 # this functionality to truncate --alloc
  34 fallocate --help >/dev/null || skip_ 'The fallocate utility is required'
  35 fallocate -l 1 -n falloc.test ||
  36   skip_ 'this file system lacks FALLOCATE support'
  37 rm falloc.test
  38
  39 # Require more space than we'll actually use, so that
  40 # tests run in parallel do not run out of space.
  41 # Otherwise, with inadequate space, simply running the following
  42 # fallocate command would induce a temporary disk-full condition,
  43 # which would cause failure of unrelated tests run in parallel.
  44 require_file_system_bytes_free_ 800000000
  45
  46 fallocate -l 600MiB space.test ||
  47   skip_ 'this test needs at least 600MiB free space'
  48
  49 # Disable this test on old BTRFS (e.g. Fedora 14)
  50 # which reports ordinary extents for unwritten ones.
  51 filefrag space.test || skip_ 'the `filefrag` utility is missing'
  52 filefrag -v space.test | grep -F 'unwritten' > /dev/null ||
  53   skip_ 'this file system does not report empty extents as "unwritten"'
  54
  55 rm space.test
  56
  57 # Ensure we read a large empty file quickly
  58 fallocate -l 300MiB empty.big || framework_failure_
  59 timeout 3 cp --sparse=always empty.big cp.test || fail=1
  60 test $(stat -c %s empty.big) = $(stat -c %s cp.test) || fail=1
  61 rm empty.big cp.test
  62
  63 # Ensure we handle extents beyond file size correctly.
  64 # Note until we support fallocate, we will not maintain
  65 # the file allocation.  FIXME: amend this test when fallocate is supported.
  66 fallocate -l 10MiB -n unwritten.withdata || framework_failure_
  67 dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unwritten.withdata
  68 cp unwritten.withdata cp.test || fail=1
  69 test $(stat -c %s unwritten.withdata) = $(stat -c %s cp.test) || fail=1
  70 cmp unwritten.withdata cp.test || fail=1
  71 rm unwritten.withdata cp.test
  72
  73 # The following to generate unaccounted extents followed by a hole, is not
  74 # supported by ext4 at least. The ftruncate discards all extents not
  75 # accounted for in the size.
  76 #  fallocate -l 10MiB -n unacc.withholes
  77 #  dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unacc.withholes
  78 #  truncate -s20M unacc.withholes
  79
  80 # Ensure we handle a hole after empty extents correctly.
  81 # Since all extents are accounted for in the size,
  82 # we can maintain the allocation independently from
  83 # fallocate() support.
  84 fallocate -l 10MiB empty.withholes
  85 truncate -s 20M empty.withholes
  86 sectors_per_block=$(expr $(stat -c %o .) / 512)
  87 cp empty.withholes cp.test || fail=1
  88 test $(stat -c %s empty.withholes) = $(stat -c %s cp.test) || fail=1
  89 # These are usually equal but can vary by an IO block due to alignment
  90 alloc_diff=$(expr $(stat -c %b empty.withholes) - $(stat -c %b cp.test))
  91 alloc_diff=$(echo $alloc_diff | tr -d -- -) # abs()
  92 test $alloc_diff -le $sectors_per_block || fail=1
  93 # Again with SPARSE_ALWAYS
  94 cp --sparse=always empty.withholes cp.test || fail=1
  95 test $(stat -c %s empty.withholes) = $(stat -c %s cp.test) || fail=1
  96 # cp.test should take 0 space, but allowing for some systems
  97 # that store default extended attributes in data blocks
  98 test $(stat -c %b cp.test) -le $sectors_per_block || fail=1
  99 rm empty.withholes cp.test
 100
 101 Exit $fail