[PATCH 1/3] btrfs/012 btrfs/136: skip the test if ext* doesn't support the block size

[Qu Wenruo <wqu@suse.com>]

[FALSE ALERT]
When testing btrfs bs > ps support, the test cases btrfs/012 and
btrfs/136 fail like the following:

 FSTYP         -- btrfs
 PLATFORM      -- Linux/x86_64 btrfs-vm 6.17.0-rc4-custom+ #285 SMP PREEMPT_DYNAMIC Mon Sep 15 14:40:01 ACST 2025
 MKFS_OPTIONS  -- -s 8k /dev/mapper/test-scratch1
 MOUNT_OPTIONS -- /dev/mapper/test-scratch1 /mnt/scratch

 btrfs/012       [failed, exit status 1]- output mismatch (see /home/adam/xfstests/results//btrfs/012.out.bad)
     --- tests/btrfs/012.out	2024-07-17 16:27:18.790000343 +0930
     +++ /home/adam/xfstests/results//btrfs/012.out.bad	2025-09-15 16:32:55.185922173 +0930
     @@ -1,7 +1,11 @@
      QA output created by 012
     +mount: /mnt/scratch: wrong fs type, bad option, bad superblock on /dev/mapper/test-scratch1, missing codepage or helper program, or other error.
     +       dmesg(1) may have more information after failed mount system call.
     +mkdir: cannot create directory '/mnt/scratch/stressdir': File exists
     +umount: /mnt/scratch: not mounted.
      Checking converted btrfs against the original one:
     -OK
     ...
     (Run 'diff -u /home/adam/xfstests/tests/btrfs/012.out /home/adam/xfstests/results//btrfs/012.out.bad'  to see the entire diff)

 btrfs/136 3s ... - output mismatch (see /home/adam/xfstests/results//btrfs/136.out.bad)
     --- tests/btrfs/136.out	2022-05-11 11:25:30.743333331 +0930
     +++ /home/adam/xfstests/results//btrfs/136.out.bad	2025-09-19 07:00:00.395280850 +0930
     @@ -1,2 +1,10 @@
      QA output created by 136
     +mount: /mnt/scratch: wrong fs type, bad option, bad superblock on /dev/mapper/test-scratch1, missing codepage or helper program, or other error.
     +       dmesg(1) may have more information after failed mount system call.
     +umount: /mnt/scratch: not mounted.
     +mount: /mnt/scratch: wrong fs type, bad option, bad superblock on /dev/mapper/test-scratch1, missing codepage or helper program, or other error.
     +       dmesg(1) may have more information after failed mount system call.
     +umount: /mnt/scratch: not mounted.
     ...
     (Run 'diff -u /home/adam/xfstests/tests/btrfs/136.out /home/adam/xfstests/results//btrfs/136.out.bad'  to see the entire diff)

[CAUSE]
Currently ext* doesn't support block size larger than page size, thus
at mkfs time it will output the following warning:

 Warning: blocksize 8192 not usable on most systems.
 mke2fs 1.47.3 (8-Jul-2025)
 Warning: 8192-byte blocks too big for system (max 4096), forced to continue

Furthermore at ext* mount time it will fail with the following dmesg:

 EXT4-fs (loop0): bad block size 8192

[FIX]
Check if the mount of the newly created ext* succeeded.

If not, since the only extra parameter for mkfs is the block size, we
know it's some block size ext* not yet supported, and skip the test
case.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 tests/btrfs/012 | 3 +++
 tests/btrfs/136 | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/tests/btrfs/012 b/tests/btrfs/012
index f41d7e4e..665831b9 100755
--- a/tests/btrfs/012
+++ b/tests/btrfs/012
@@ -42,6 +42,9 @@ $MKFS_EXT4_PROG -F -b $BLOCK_SIZE $SCRATCH_DEV > $seqres.full 2>&1 || \
 	_notrun "Could not create ext4 filesystem"
 # Manual mount so we don't use -t btrfs or selinux context
 mount -t ext4 $SCRATCH_DEV $SCRATCH_MNT
+if [ $? -ne 0 ]; then
+	_notrun "block size $BLOCK_SIZE is not supported by ext4"
+fi
 
 echo "populating the initial ext fs:" >> $seqres.full
 mkdir "$SCRATCH_MNT/$BASENAME"
diff --git a/tests/btrfs/136 b/tests/btrfs/136
index 65bbcf51..6b4b52e4 100755
--- a/tests/btrfs/136
+++ b/tests/btrfs/136
@@ -45,6 +45,9 @@ $MKFS_EXT4_PROG -F -t ext3 -b $BLOCK_SIZE $SCRATCH_DEV > $seqres.full 2>&1 || \
 
 # mount and populate non-extent file
 mount -t ext3 $SCRATCH_DEV $SCRATCH_MNT
+if [ $? -ne 0 ]; then
+	_notrun "block size $BLOCK_SIZE is not supported by ext3"
+fi
 populate_data "$SCRATCH_MNT/ext3_ext4_data/ext3"
 _scratch_unmount
 
-- 
2.51.0