From: Zhang Yi <yi.zhang@xxxxxxxxxx>
Refactor and cleanup ext4_da_map_blocks(), reduce some unnecessary
parameters and branches, no logic changes.
Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
---
fs/ext4/inode.c | 39 +++++++++++++++++----------------------
1 file changed, 17 insertions(+), 22 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 61277f7f8722..5b0d3075be12 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -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 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
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;
}
--
2.39.2
