Some devices report an optimal_io_size less than 4K. Currently mkfs.gfs2
uses the non-zero value to choose the block size, which is almost
certainly a bad choice when it's less than 4K. Update choose_blocksize()
to avoid using device topology hints for the block size choice when
they're less than the default block size (4K). Test case included.
Resolves: rhbz#1839219
Signed-off-by: Andrew Price <anpr...@redhat.com>
---
gfs2/mkfs/main_mkfs.c | 2 +-
tests/mkfs.at | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/gfs2/mkfs/main_mkfs.c b/gfs2/mkfs/main_mkfs.c
index 846b341f..412d4701 100644
--- a/gfs2/mkfs/main_mkfs.c
+++ b/gfs2/mkfs/main_mkfs.c
@@ -505,7 +505,7 @@ static unsigned choose_blocksize(struct mkfs_opts *opts)
}
if (!opts->got_bsize && got_topol) {
if (dev->optimal_io_size <= getpagesize() &&
- dev->optimal_io_size >= dev->minimum_io_size)
+ dev->optimal_io_size >= GFS2_DEFAULT_BSIZE)
bsize = dev->optimal_io_size;
else if (dev->physical_sector_size <= getpagesize() &&
dev->physical_sector_size >= GFS2_DEFAULT_BSIZE)
diff --git a/tests/mkfs.at b/tests/mkfs.at
index 57785a0d..4c8b2249 100644
--- a/tests/mkfs.at
+++ b/tests/mkfs.at
@@ -112,6 +112,8 @@ AT_CLEANUP
AT_SETUP([Device i/o limits handling])
AT_KEYWORDS(mkfs.gfs2 mkfs)
AT_CHECK([$GFS_MKFS -p lock_nolock -o test_topology=0:0:0:0:0 $GFS_TGT], 0,
[ignore], [ignore])
+AT_CHECK([$GFS_MKFS -p lock_nolock -o test_topology=0:512:512:512:512
$GFS_TGT], 0, [ignore], [ignore])
+AT_CHECK([gfs2_edit -p sb field sb_bsize $GFS_TGT | tr -d '\n' ], 0, [4096],
[ignore])
AT_CHECK([$GFS_MKFS -p lock_nolock -o test_topology=7168:512:0:33553920:512
$GFS_TGT], 0, [ignore], [ignore])
AT_CHECK([$GFS_MKFS -p lock_nolock -o test_topology=7168:512:8192:33553920:512
$GFS_TGT], 0, [ignore], [Warning: device is not properly aligned. This may harm
performance.
])
--
2.26.2
