Commit 31daa826 authored by Baokun Li's avatar Baokun Li Committed by Theodore Ts'o
Browse files

ext4: prepare buddy cache inode for BS > PS with large folios 



We use EXT4_BAD_INO for the buddy cache inode number. This inode is not
accessed via __ext4_new_inode() or __ext4_iget(), meaning
ext4_set_inode_mapping_order() is not called to set its folio order range.

However, future block size greater than page size support requires this
inode to support large folios, and the buddy cache code already handles
BS > PS. Therefore, ext4_set_inode_mapping_order() is now explicitly
called for this specific inode to set its folio order range.

Signed-off-by: default avatarBaokun Li <libaokun1@huawei.com>
Reviewed-by: default avatarZhang Yi <yi.zhang@huawei.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarOjaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-15-libaokun@huaweicloud.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 0ad55fa1

fs/ext4/mballoc.c

+2 −0
Original line number Diff line number Diff line
@@ -3510,6 +3510,8 @@ static int ext4_mb_init_backend(struct super_block *sb) 
	 * this will avoid confusion if it ever shows up during debugging. */

	sbi->s_buddy_cache->i_ino = EXT4_BAD_INO;

	EXT4_I(sbi->s_buddy_cache)->i_disksize = 0;

	ext4_set_inode_mapping_order(sbi->s_buddy_cache);



	for (i = 0; i < ngroups; i++) {

		cond_resched();

		desc = ext4_get_group_desc(sb, i, NULL);