xfs/529: fix bogus failure when realtime is configured

If I have a realtime volume configured, this test will sometimes trip
over this:

XFS: Assertion failed: nmaps == 1, file: fs/xfs/xfs_dquot.c, line: 360
Call Trace:
 xfs_dquot_disk_alloc+0x3dc/0x400 [xfs 97e1fa8953d397b1fb9732df4de7fa9070bda501]
 xfs_qm_dqread+0xc9/0x190 [xfs 97e1fa8953d397b1fb9732df4de7fa9070bda501]
 xfs_qm_dqget+0xa8/0x230 [xfs 97e1fa8953d397b1fb9732df4de7fa9070bda501]
 xfs_qm_vop_dqalloc+0x160/0x600 [xfs 97e1fa8953d397b1fb9732df4de7fa9070bda501]
 xfs_setattr_nonsize+0x318/0x520 [xfs 97e1fa8953d397b1fb9732df4de7fa9070bda501]
 notify_change+0x30e/0x490
 chown_common+0x13e/0x1f0
 do_fchownat+0x8d/0xe0
 __x64_sys_fchownat+0x1b/0x20
 do_syscall_64+0x2b/0x80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fa6985e2cae

The test injects the bmap_alloc_minlen_extent error, which refuses to
allocate file space unless it's exactly minlen long.  However, a
precondition of this injection point is that the free space on the data
device must be sufficiently fragmented that there are small free
extents.

However, if realtime and rtinherit are enabled, the punch-alternating
call will operate on a realtime file, which only serves to write 0x55
patterns into the realtime bitmap.  Hence the test preconditions are not
satisfied, so the test is not serving its purpose.

Fix it by disabling rtinherit=1 on the rootdir so that we actually
fragment the bnobt/cntbt as required.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Andrey Albershteyn <aalbersh@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>

diff --git a/tests/xfs/529 b/tests/xfs/529
index 83d24da0ac5f335f98a8352a910e5e3ca0354f52..cd176877f52713c27aa58831a402dfb1c1212e33 100755 (executable)
--- a/tests/xfs/529
+++ b/tests/xfs/529
@@ -32,6 +32,10 @@ echo "Format and mount fs"
 _scratch_mkfs_sized $((512 * 1024 * 1024)) >> $seqres.full
 _scratch_mount -o uquota >> $seqres.full
 
+# bmap_alloc_minlen_extent only applies to the datadev space allocator, so
+# we force the filesystem not to use the realtime volume.
+_xfs_force_bdev data $SCRATCH_MNT
+
 bsize=$(_get_file_block_size $SCRATCH_MNT)
 
 echo "* Delalloc to written extent conversion"