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generic: fsync files with multiple links
Test that when we have a file with multiple hard links belonging to
different parent directories, if we remove one of those links, fsync the
file using one of its other links (that has a parent directory different
from the one we removed a link from), power fail and then replay the
fsync log/journal, the hard link we removed is not available anymore and
all the filesystem metadata is in a consistent state.
This test is motivated by an issue found in btrfs, where the test fails
with:
generic/107 2s ... - output mismatch (see .../results/generic/107.out.bad)
--- tests/generic/107.out 2015-08-04 09:47:46.922131256 +0100
+++ /home/fdmanana/git/hub/xfstests/results//generic/107.out.bad
@@ -1,3 +1,5 @@
QA output created by 107
Entries in testdir:
foo2
+foo3
+rmdir: failed to remove '/home/fdmanana/btrfs-tests/scratch_1/testdir': Directory not empty
...
(Run 'diff -u tests/generic/107.out .../generic/107.out.bad' to see the entire diff)
_check_btrfs_filesystem: filesystem on /dev/sdc is inconsistent (see .../generic/107.full)
_check_dmesg: something found in dmesg (see .../generic/107.dmesg)
$ cat /home/fdmanana/git/hub/xfstests/results//generic/107.full
_check_btrfs_filesystem: filesystem on /dev/sdc is inconsistent
*** fsck.btrfs output ***
checking extents
checking free space cache
checking fs roots
root 5 inode 257 errors 200, dir isize wrong
unresolved ref dir 257 index 3 namelen 4 name foo3 filetype 1 \
errors 5, no dir item, no inode ref
$ cat /home/fdmanana/git/hub/xfstests/results//generic/107.dmesg
(...)
[188897.707311] BTRFS info (device dm-0): failed to delete reference to \
foo3, inode 258 parent 257
[188897.711345] ------------[ cut here ]------------
[188897.713369] WARNING: CPU: 10 PID: 19452 at fs/btrfs/inode.c:3956 \
__btrfs_unlink_inode+0x182/0x35a [btrfs]()
[188897.717661] BTRFS: Transaction aborted (error -2)
(...)
[188897.747898] Call Trace:
[188897.748519] [<ffffffff8145f077>] dump_stack+0x4f/0x7b
[188897.749602] [<ffffffff81095de5>] ? console_unlock+0x356/0x3a2
[188897.750682] [<ffffffff8104b3b0>] warn_slowpath_common+0xa1/0xbb
[188897.751936] [<ffffffffa04c5d09>] ? __btrfs_unlink_inode+0x182/0x35a [btrfs]
[188897.753485] [<ffffffff8104b410>] warn_slowpath_fmt+0x46/0x48
[188897.754781] [<ffffffffa04c5d09>] __btrfs_unlink_inode+0x182/0x35a [btrfs]
[188897.756295] [<ffffffffa04c6e8f>] btrfs_unlink_inode+0x1e/0x40 [btrfs]
[188897.757692] [<ffffffffa04c6f11>] btrfs_unlink+0x60/0x9b [btrfs]
[188897.758978] [<ffffffff8116fb48>] vfs_unlink+0x9c/0xed
[188897.760151] [<ffffffff81173481>] do_unlinkat+0x12b/0x1fb
[188897.761354] [<ffffffff81253855>] ? lockdep_sys_exit_thunk+0x12/0x14
[188897.762692] [<ffffffff81174056>] SyS_unlinkat+0x29/0x2b
[188897.763741] [<ffffffff81465197>] system_call_fastpath+0x12/0x6f
[188897.764894] ---[ end trace bbfddacb7aaada8c ]---
[188897.765801] BTRFS warning (device dm-0): __btrfs_unlink_inode:3956: \
Aborting unused transaction(No such entry).
Tested against ext3/4, xfs, reiserfs and f2fs too, and all these
filesystems currently pass this test (on a 4.1 linux kernel at least).
The btrfs issue is fixed by the linux kernel patch titled:
"Btrfs: fix stale dir entries after removing a link and fsync".
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Filipe Manana
committed by
Dave Chinner
Dave Chinner
parent
c9b9d5f6a9
commit
1bea79d6c1
Executable
+99
@@ -0,0 +1,99 @@
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#! /bin/bash
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# FSQA Test No. 107
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#
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# Test that when we have a file with multiple hard links belonging to different
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# parent directories, if we remove one of those links, fsync the file using one
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# of its other links (that has a parent directory different from the one we
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# removed a link from), power fail and then replay the fsync log/journal, the
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# hard link we removed is not available anymore and all the filesystem metadata
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# is in a consistent state.
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#
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#-----------------------------------------------------------------------
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#
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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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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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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_cleanup_flakey
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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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. ./common/dmflakey
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# real QA test starts here
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_need_to_be_root
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_supported_fs generic
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_supported_os Linux
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_require_scratch
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_require_dm_flakey
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_require_metadata_journaling $SCRATCH_DEV
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rm -f $seqres.full
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_scratch_mkfs >>$seqres.full 2>&1
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_init_flakey
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_mount_flakey
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# Create our test directory and file.
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mkdir $SCRATCH_MNT/testdir
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touch $SCRATCH_MNT/foo
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/testdir/foo2
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/testdir/foo3
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# Make sure everything done so far is durably persisted.
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sync
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# Now we remove one of our file's hardlinks in the directory testdir.
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unlink $SCRATCH_MNT/testdir/foo3
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# We now fsync our file using the "foo" link, which has a parent that
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# is not the directory "testdir".
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$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo
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# Silently drop all writes and unmount to simulate a crash/power failure.
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_load_flakey_table $FLAKEY_DROP_WRITES
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_unmount_flakey
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# Allow writes again and mount the fs to trigger log/journal replay.
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_load_flakey_table $FLAKEY_ALLOW_WRITES
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_mount_flakey
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# After the journal/log is replayed we expect to not see the "foo3" link anymore
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# and we should be able to remove all names in the directory "testdir" and then
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# remove it (no stale directory entries left after the journal/log replay).
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echo "Entries in testdir:"
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ls -1 $SCRATCH_MNT/testdir
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rm -f $SCRATCH_MNT/testdir/*
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rmdir $SCRATCH_MNT/testdir
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_unmount_flakey
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status=0
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exit
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@@ -0,0 +1,3 @@
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QA output created by 107
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Entries in testdir:
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foo2
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@@ -109,6 +109,7 @@
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104 auto quick metadata
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105 acl auto quick
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106 auto quick metadata
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107 auto quick metadata
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112 rw aio auto quick
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113 rw aio auto quick
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117 attr auto quick
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