erofs-utils: Set mkfs default blocksize based on current platform

Set mkfs default blocksize to current platform pagesize.
This means mkfs with default options will work on current
platform. If we are building image for a platform for a different
blocksize, we can override default with -b option up to
EROFS_MAX_BLOCK_SIZE.

Signed-off-by: Sandeep Dhavale <dhavale@google.com>
Link: https://lore.kernel.org/r/20230830231606.3783734-2-dhavale@google.com
[ Gao Xiang: compare with EROFS_MAX_BLOCK_SIZE for safety. ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

diff --git a/mkfs/main.c b/mkfs/main.c
index 7225c400f4889710b595d1df3e84692a5e17748b..16da9c0af3967d3e06bd36b4adea54a76561d9ca 100644 (file)
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -705,7 +705,7 @@ static void erofs_mkfs_default_options(void)
        cfg.c_showprogress = true;
        cfg.c_legacy_compress = false;
        cfg.c_xattr_name_filter = true;
-       sbi.blkszbits = ilog2(EROFS_MAX_BLOCK_SIZE);
+       sbi.blkszbits = ilog2(min_t(u32, getpagesize(), EROFS_MAX_BLOCK_SIZE));
        sbi.feature_incompat = EROFS_FEATURE_INCOMPAT_ZERO_PADDING;
        sbi.feature_compat = EROFS_FEATURE_COMPAT_SB_CHKSUM |
                             EROFS_FEATURE_COMPAT_MTIME;