[PATCH] fstests: generic: add a basic cachestat test case
Qu Wenruo <[email protected]>
| Newsgroups | org.kernel.vger.linux-btrfs,org.kernel.vger.fstests |
|---|---|
| Message-ID | <[email protected]> |
The test case is inspired by LTP, where there is a regression on 64K page size systems with btrfs, that after a fsync, cachestat() still report dirty pages. The test case itself is pretty simple, fill the file with a buffered write that is 1/2/4/8/16 page sized, call cachestat() to make sure the cached/dirtied number match the page number. Then do a fsync(), and make sure the dirty page number reduced to 0 meanwhile cached is still the same. Link: https://bugzilla.suse.com/show_bug.cgi?id=1270397 Reviewed-by: Anand Jain <[email protected]> Reviewed-by: Filipe Manana <[email protected]> Signed-off-by: Qu Wenruo <[email protected]> --- Changelog: v3: - Use golden output to greatly simplify the test case - Do not mkfs for each size, just remove the original file v2: - Reject "sync" and "dax" mount options Those mount options write back data synchronously, will screw up the buffered write dirtied page reporting. - Use AWK_PROG everywhere. - Remove the unnecessary redirection for fsync --- tests/generic/798 | 39 +++++++++++++++++++++++++++++++++++++++ tests/generic/798.out | 16 ++++++++++++++++ 2 files changed, 55 insertions(+) create mode 100755 tests/generic/798 create mode 100644 tests/generic/798.out diff --git a/tests/generic/798 b/tests/generic/798 new file mode 100755 index 00000000..0fe37646 --- /dev/null +++ b/tests/generic/798 @@ -0,0 +1,39 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2026 SUSE S.A. All Rights Reserved. +# +# FS QA Test 798 +# +# Basic tests for cachestat() +# +. ./common/preamble +_begin_fstest auto quick + +_require_xfs_io_command "cachestat" +_require_scratch +# Any mount option that writes data back synchronously should be rejected. +# Or it will screw up the dirtied page reporting for buffered writes. +_exclude_scratch_mount_option "dax" +_exclude_scratch_mount_option "sync" + +pagesize=$(_get_page_size) + +_scratch_mkfs > /dev/null +_scratch_mount + +for num_page in 1 2 4 8 16; do + size=$(($pagesize * $num_page)) + + echo "=== Test with $num_page pages ===" + + rm -f $SCRATCH_MNT/foobar + $XFS_IO_PROG -f -c "pwrite -b $pagesize 0 $size" $SCRATCH_MNT/foobar > /dev/null + # Basic cached number reporting + $XFS_IO_PROG -c "cachestat 0 $size" $SCRATCH_MNT/foobar + + # Test dirty page number reporting after a fsync. + $XFS_IO_PROG -c "fsync" -c "cachestat 0 $size" $SCRATCH_MNT/foobar +done + +_scratch_unmount +_exit 0 diff --git a/tests/generic/798.out b/tests/generic/798.out new file mode 100644 index 00000000..ca6ead3c --- /dev/null +++ b/tests/generic/798.out @@ -0,0 +1,16 @@ +QA output created by 798 +=== Test with 1 pages === +Cached: 1, Dirty: 1, Writeback: 0, Evicted: 0, Recently Evicted: 0 +Cached: 1, Dirty: 0, Writeback: 0, Evicted: 0, Recently Evicted: 0 +=== Test with 2 pages === +Cached: 2, Dirty: 2, Writeback: 0, Evicted: 0, Recently Evicted: 0 +Cached: 2, Dirty: 0, Writeback: 0, Evicted: 0, Recently Evicted: 0 +=== Test with 4 pages === +Cached: 4, Dirty: 4, Writeback: 0, Evicted: 0, Recently Evicted: 0 +Cached: 4, Dirty: 0, Writeback: 0, Evicted: 0, Recently Evicted: 0 +=== Test with 8 pages === +Cached: 8, Dirty: 8, Writeback: 0, Evicted: 0, Recently Evicted: 0 +Cached: 8, Dirty: 0, Writeback: 0, Evicted: 0, Recently Evicted: 0 +=== Test with 16 pages === +Cached: 16, Dirty: 16, Writeback: 0, Evicted: 0, Recently Evicted: 0 +Cached: 16, Dirty: 0, Writeback: 0, Evicted: 0, Recently Evicted: 0 -- 2.51.2