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btrfs: test free space tree mount options
The behavior of different combinations of space_cache mount options wasn't well defined, which led to a regression between my initial patches adding the free space tree and the 4.5 release. Add a test to exercise all of the meaningful permutations of clear_cache, nospace_cache, and space_cache. This is a regression test for Linux kernel commit "Btrfs: fix mount -o clear_cache,space_cache=v2". Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Omar Sandoval
Eryu Guan
Executable
+153
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#! /bin/bash
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# FS QA Test 131
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#
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# Test free space tree mount options.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2016 Facebook. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would 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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#
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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, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_btrfs inspect-internal
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mkfs_v1()
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{
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_scratch_mkfs >/dev/null 2>&1
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# Future proof against btrfs-progs making space_cache=v2 filesystems by
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# default.
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_scratch_mount -o clear_cache,space_cache=v1
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_scratch_unmount
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}
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mkfs_v2()
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{
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_scratch_mkfs >/dev/null 2>&1
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_scratch_mount -o space_cache=v2
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_scratch_unmount
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}
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check_fst_compat()
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{
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compat_ro="$($BTRFS_UTIL_PROG inspect-internal dump-super "$SCRATCH_DEV" | \
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sed -rn 's/^compat_ro_flags\s+(.*)$/\1/p')"
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if ((compat_ro & 0x1)); then
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echo "free space tree is enabled"
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else
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echo "free space tree is disabled"
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fi
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}
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# Mount options might interfere.
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export MOUNT_OPTIONS=""
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# When the free space tree is not enabled:
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# -o space_cache=v1: keep using the old free space cache
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# -o space_cache=v2: enable the free space tree
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# -o clear_cache,space_cache=v2: clear the free space cache and enable the free space tree
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# We don't check the no options case or plain space_cache as that will change
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# in the future to turn on space_cache=v2.
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mkfs_v1
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echo "Using free space cache"
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_scratch_mount -o space_cache=v1
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check_fst_compat
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_scratch_unmount
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mkfs_v1
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echo "Enabling free space tree"
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_scratch_mount -o space_cache=v2
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check_fst_compat
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_scratch_unmount
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mkfs_v1
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echo "Disabling free space cache and enabling free space tree"
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_scratch_mount -o clear_cache,space_cache=v2
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check_fst_compat
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_scratch_unmount
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# When the free space tree is enabled:
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# -o nospace_cache, -o space_cache=v1: error
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# no options, -o space_cache=v2: keep using the free space tree
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# -o clear_cache, -o clear_cache,space_cache=v2: clear and recreate the free space tree
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# -o clear_cache,nospace_cache: clear the free space tree
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# -o clear_cache,space_cache=v1: clear the free space tree, enable the free space cache
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mkfs_v2
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echo "Trying to mount without free space tree"
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_scratch_mount -o nospace_cache >/dev/null 2>&1 || echo "mount failed"
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_scratch_mount -o space_cache=v1 >/dev/null 2>&1 || echo "mount failed"
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mkfs_v2
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echo "Mounting existing free space tree"
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_scratch_mount
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check_fst_compat
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_scratch_unmount
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_scratch_mount -o space_cache=v2
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check_fst_compat
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_scratch_unmount
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mkfs_v2
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echo "Recreating free space tree"
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_scratch_mount -o clear_cache,space_cache=v2
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check_fst_compat
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_scratch_unmount
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mkfs_v2
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_scratch_mount -o clear_cache
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check_fst_compat
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_scratch_unmount
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mkfs_v2
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echo "Disabling free space tree"
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_scratch_mount -o clear_cache,nospace_cache
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check_fst_compat
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_scratch_unmount
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mkfs_v2
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echo "Reverting to free space cache"
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_scratch_mount -o clear_cache,space_cache=v1
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check_fst_compat
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_scratch_unmount
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# success, all done
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status=0
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exit
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@@ -0,0 +1,20 @@
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QA output created by 131
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Using free space cache
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free space tree is disabled
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Enabling free space tree
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free space tree is enabled
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Disabling free space cache and enabling free space tree
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free space tree is enabled
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Trying to mount without free space tree
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mount failed
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mount failed
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Mounting existing free space tree
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free space tree is enabled
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free space tree is enabled
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Recreating free space tree
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free space tree is enabled
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free space tree is enabled
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Disabling free space tree
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free space tree is disabled
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Reverting to free space cache
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free space tree is disabled
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@@ -133,3 +133,4 @@
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128 auto quick send
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129 auto quick send
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130 auto clone send
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131 auto quick
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