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ext4: add EXT4_LBLK_TO_PG and EXT4_PG_TO_LBLK for block/page conversion

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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: Jan Kara <jack@suse.cz>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-11-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Baokun Li
2025-11-21 17:06:40 +08:00
committed by Theodore Ts'o
parent 125d1f6a5a
commit 2a8de76b2b
1 changed files with 6 additions and 0 deletions
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6
fs/ext4/ext4.h
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@@ -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 */