Commit 2a8de76b authored by Baokun Li's avatar Baokun Li Committed by Theodore Ts'o
Browse files

ext4: add EXT4_LBLK_TO_PG and EXT4_PG_TO_LBLK for block/page conversion 



As BS > PS support is coming, all block number to page index (and
vice-versa) conversions must now go via bytes. Added EXT4_LBLK_TO_PG()
and EXT4_PG_TO_LBLK() macros to simplify these conversions and handle
both BS <= PS and BS > PS scenarios cleanly.

Suggested-by: default avatarJan Kara <jack@suse.cz>
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: <20251121090654.631996-11-libaokun@huaweicloud.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 125d1f6a

fs/ext4/ext4.h

+6 −0
Original line number Diff line number Diff line
@@ -370,6 +370,12 @@ struct ext4_io_submit { 
	(round_up((offset), i_blocksize(inode)) >> (inode)->i_blkbits)

#define EXT4_LBLK_TO_B(inode, lblk) ((loff_t)(lblk) << (inode)->i_blkbits)



/* Translate a block number to a page index */

#define EXT4_LBLK_TO_PG(inode, lblk)	(EXT4_LBLK_TO_B((inode), (lblk)) >> \

					 PAGE_SHIFT)

/* Translate a page index to a block number */

#define EXT4_PG_TO_LBLK(inode, pnum)	(((loff_t)(pnum) << PAGE_SHIFT) >> \

					 (inode)->i_blkbits)

/* Translate a block number to a cluster number */

#define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)

/* Translate a cluster number to a block number */