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ext4: refactor ext4_da_map_blocks() 

Refactor and cleanup ext4_da_map_blocks(), reduce some unnecessary
parameters and branches, no logic changes.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240127015825.1608160-2-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi 2024-01-27 09:58:00 +08:00 committed by Theodore Ts'o
parent f0e54b6087
commit 3fcc2b887a
1 changed files with 17 additions and 22 deletions
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39
fs/ext4/inode.c
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@ -1704,7 +1704,6 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
/* Lookup extent status tree firstly */
if (ext4_es_lookup_extent(inode, iblock, NULL, &es)) {
if (ext4_es_is_hole(&es)) {
retval = 0;
down_read(&EXT4_I(inode)->i_data_sem);
goto add_delayed;
}
@ -1749,26 +1748,9 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
retval = ext4_ext_map_blocks(NULL, inode, map, 0);
else
retval = ext4_ind_map_blocks(NULL, inode, map, 0);
add_delayed:
if (retval == 0) {
int ret;
/*
* XXX: __block_prepare_write() unmaps passed block,
* is it OK?
*/
ret = ext4_insert_delayed_block(inode, map->m_lblk);
if (ret != 0) {
retval = ret;
goto out_unlock;
}
map_bh(bh, inode->i_sb, invalid_block);
set_buffer_new(bh);
set_buffer_delay(bh);
} else if (retval > 0) {
if (retval < 0)
goto out_unlock;
if (retval > 0) {
unsigned int status;
if (unlikely(retval != map->m_len)) {
@ -1783,11 +1765,24 @@ add_delayed:
EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
map->m_pblk, status);
goto out_unlock;
}
add_delayed:
/*
* XXX: __block_prepare_write() unmaps passed block,
* is it OK?
*/
retval = ext4_insert_delayed_block(inode, map->m_lblk);
if (retval)
goto out_unlock;
map_bh(bh, inode->i_sb, invalid_block);
set_buffer_new(bh);
set_buffer_delay(bh);
out_unlock:
up_read((&EXT4_I(inode)->i_data_sem));
return retval;
}