ext4: don't run ext4lazyinit for read-only filesystems

On a read-only filesystem, we won't invoke the block allocator, so we
don't need to prefetch the block bitmaps.

This avoids starting and running the ext4lazyinit thread at all on a
system with no read-write ext4 filesystems (for instance, a container VM
with read-only filesystems underneath an overlayfs).

Fixes: 21175ca434c5 ("ext4: make prefetch_block_bitmaps default")
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Link: https://lore.kernel.org/r/48b41da1498fcac3287e2e06b660680646c1c050.1659323972.git.josh@joshtriplett.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 23329d7..afbbf07 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3973,9 +3973,9 @@ int ext4_register_li_request(struct super_block *sb,
                goto out;
        }
 
-       if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
-           (first_not_zeroed == ngroups || sb_rdonly(sb) ||
-            !test_opt(sb, INIT_INODE_TABLE)))
+       if (sb_rdonly(sb) ||
+           (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
+            (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))
                goto out;
 
        elr = ext4_li_request_new(sb, first_not_zeroed);