linux-ext4 - [PATCH 1/2] ext2: Correct maximum ext2 filesystem block size

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Date:   Wed,  1 Mar 2023 12:12:30 +0100
From:   Jan Kara <jack@...e.cz>
To:     <linux-ext4@...r.kernel.org>
Cc:     Jan Kara <jack@...e.cz>
Subject: [PATCH 1/2] ext2: Correct maximum ext2 filesystem block size

Ext2 has traditionally supported filesystem block sizes upto page size
or upto 65536. Macro EXT2_MAX_BLOCK_SIZE is set to 4096, however that is
never used in ext2 so practically we always allowed whatever
sb_set_blocksize() accepted. Fix value of EXT2_MAX_BLOCK_SIZE because it
will be used in the next patch.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext2/ext2.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index cb78d7dcfb95..6c8e838bb278 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -178,7 +178,7 @@ static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
  * Macro-instructions used to manage several block sizes
  */
 #define EXT2_MIN_BLOCK_SIZE		1024
-#define	EXT2_MAX_BLOCK_SIZE		4096
+#define	EXT2_MAX_BLOCK_SIZE		65536
 #define EXT2_MIN_BLOCK_LOG_SIZE		  10
 #define EXT2_BLOCK_SIZE(s)		((s)->s_blocksize)
 #define	EXT2_ADDR_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (__u32))
-- 
2.35.3