[PATCH 2/2] generic: Addition of new tests for extsize hints

[Nirjhar Roy <nirjhar@linux.ibm.com>]

This commit adds new tests that checks the behaviour of xfs/ext4
filesystems when extsize hint is set on file with inode size as 0, non-empty
files with allocated and delalloc extents and so on.
Although currently this test is placed under tests/generic, it
only runs on xfs and there is an ongoing patch series[1] to enable
extsize hints for ext4 as well.

[1] https://lore.kernel.org/linux-ext4/cover.1726034272.git.ojaswin@linux.ibm.com/

Suggested-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Signed-off-by: Nirjhar Roy <nirjhar@linux.ibm.com>
---
 tests/generic/365     | 156 ++++++++++++++++++++++++++++++++++++++++++
 tests/generic/365.out |  26 +++++++
 2 files changed, 182 insertions(+)
 create mode 100755 tests/generic/365
 create mode 100644 tests/generic/365.out

diff --git a/tests/generic/365 b/tests/generic/365
new file mode 100755
index 00000000..85a7ce9a
--- /dev/null
+++ b/tests/generic/365
@@ -0,0 +1,156 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2024 Nirjhar Roy (nirjhar@linux.ibm.com).  All Rights Reserved.
+#
+# FS QA Test 365
+#
+# This test verifies that extent allocation hint setting works correctly on files with
+# no extents allocated and non-empty files which are truncated. It also checks that the
+# extent hints setting fails with non-empty file i.e, with any file with allocated
+# extents or delayed allocation. We also check if the extsize value and the
+# xflag bit actually got reflected after setting/re-setting the extsize value.
+
+. ./common/config
+. ./common/filter
+. ./common/preamble
+. ./common/xfs
+
+_begin_fstest ioctl quick
+
+_supported_fs xfs
+
+_fixed_by_kernel_commit XXXXXXXXXXXX \
+    "xfs: Check for delayed allocations before setting extsize",
+
+_require_scratch
+
+FILE_DATA_SIZE=1M
+
+filter_extsz()
+{
+    sed "s/$EXTSIZE/EXTSIZE/g"
+}
+
+setup()
+{
+    _scratch_mkfs >> "$seqres.full"  2>&1
+    _scratch_mount >> "$seqres.full" 2>&1
+    BLKSZ=`_get_block_size $SCRATCH_MNT`
+    EXTSIZE=$(( BLKSZ*2 ))
+}
+
+read_file_extsize()
+{
+    $XFS_IO_PROG -c "extsize" $1 | _filter_scratch | filter_extsz
+}
+
+check_extsz_and_xflag()
+{
+    local filename=$1
+    read_file_extsize $filename
+    _test_xfs_xflags_field $filename "e" && echo "e flag set" || echo "e flag unset"
+}
+
+check_extsz_xflag_across_remount()
+{
+    local filename=$1
+    _scratch_cycle_mount
+    check_extsz_and_xflag $filename
+}
+
+# Extsize flag should be cleared when extsize is reset, so this function
+# checks that this behavior is followed.
+reset_extsz_and_recheck_extsz_xflag()
+{
+    local filename=$1
+    echo "Re-setting extsize hint to 0"
+    $XFS_IO_PROG -c "extsize 0" $filename
+    check_extsz_xflag_across_remount $filename
+}
+
+check_extsz_xflag_before_and_after_reset()
+{
+    local filename=$1
+    check_extsz_xflag_across_remount $filename
+    reset_extsz_and_recheck_extsz_xflag $filename
+}
+
+test_empty_file()
+{
+    echo "TEST: Set extsize on empty file"
+    local filename=$1
+    $XFS_IO_PROG \
+        -c "open -f $filename" \
+        -c "extsize $EXTSIZE" \
+
+    check_extsz_xflag_before_and_after_reset $filename
+    echo
+}
+
+test_data_delayed()
+{
+    echo "TEST: Set extsize on non-empty file with delayed allocation"
+    local filename=$1
+    $XFS_IO_PROG \
+        -c "open -f $filename" \
+        -c "pwrite -q  0 $FILE_DATA_SIZE" \
+        -c "extsize $EXTSIZE" | _filter_scratch
+
+    check_extsz_xflag_across_remount $filename
+    echo
+}
+
+test_data_allocated()
+{
+    echo "TEST: Set extsize on non-empty file with allocated extents"
+    local filename=$1
+    $XFS_IO_PROG \
+        -c "open -f $filename" \
+        -c "pwrite -qW  0 $FILE_DATA_SIZE" \
+        -c "extsize $EXTSIZE" | _filter_scratch
+
+    check_extsz_xflag_across_remount $filename
+    echo
+}
+
+test_truncate_allocated()
+{
+    echo "TEST: Set extsize after truncating a file with allocated extents"
+    local filename=$1
+    $XFS_IO_PROG \
+        -c "open -f $filename" \
+        -c "pwrite -qW  0 $FILE_DATA_SIZE" \
+        -c "truncate 0" \
+        -c "extsize $EXTSIZE" \
+
+    check_extsz_xflag_across_remount $filename
+    echo
+}
+
+test_truncate_delayed()
+{
+    echo "TEST: Set extsize after truncating a file with delayed allocation"
+    local filename=$1
+    $XFS_IO_PROG \
+        -c "open -f $filename" \
+        -c "pwrite -q  0 $FILE_DATA_SIZE" \
+        -c "truncate 0" \
+        -c "extsize $EXTSIZE" \
+
+    check_extsz_xflag_across_remount $filename
+    echo
+}
+
+setup
+echo -e "EXTSIZE = $EXTSIZE BLOCKSIZE = $BLKSZ\n" >> "$seqres.full"
+
+NEW_FILE_NAME_PREFIX=$SCRATCH_MNT/new-file-
+
+test_empty_file "$NEW_FILE_NAME_PREFIX"00
+test_data_delayed "$NEW_FILE_NAME_PREFIX"01
+test_data_allocated "$NEW_FILE_NAME_PREFIX"02
+test_truncate_allocated "$NEW_FILE_NAME_PREFIX"03
+test_truncate_delayed "$NEW_FILE_NAME_PREFIX"04
+
+status=0
+exit
diff --git a/tests/generic/365.out b/tests/generic/365.out
new file mode 100644
index 00000000..38cd0885
--- /dev/null
+++ b/tests/generic/365.out
@@ -0,0 +1,26 @@
+QA output created by 365
+TEST: Set extsize on empty file
+[EXTSIZE] SCRATCH_MNT/new-file-00
+e flag set
+Re-setting extsize hint to 0
+[0] SCRATCH_MNT/new-file-00
+e flag unset
+
+TEST: Set extsize on non-empty file with delayed allocation
+xfs_io: FS_IOC_FSSETXATTR SCRATCH_MNT/new-file-01: Invalid argument
+[0] SCRATCH_MNT/new-file-01
+e flag unset
+
+TEST: Set extsize on non-empty file with allocated extents
+xfs_io: FS_IOC_FSSETXATTR SCRATCH_MNT/new-file-02: Invalid argument
+[0] SCRATCH_MNT/new-file-02
+e flag unset
+
+TEST: Set extsize after truncating a file with allocated extents
+[EXTSIZE] SCRATCH_MNT/new-file-03
+e flag set
+
+TEST: Set extsize after truncating a file with delayed allocation
+[EXTSIZE] SCRATCH_MNT/new-file-04
+e flag set
+
-- 
2.43.5