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Commit 7df3a431 authored by Fan Li's avatar Fan Li Committed by Jaegeuk Kim
Browse files

f2fs: optimize the flow of f2fs_map_blocks 



check map->m_len right after it changes to avoid excess call
to update dnode_of_data.

Signed-off-by: default avatarFan li <fanofcode.li@samsung.com>
Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 36b35a0d

fs/f2fs/data.c

+36 −33
Original line number Diff line number Diff line
@@ -573,6 +573,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 
	int err = 0, ofs = 1;

	struct extent_info ei;

	bool allocated = false;

	block_t blkaddr;



	map->m_len = 0;

	map->m_flags = 0;
@@ -636,6 +637,9 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 
	pgofs++;



get_next:

	if (map->m_len >= maxblocks)

		goto sync_out;



	if (dn.ofs_in_node >= end_offset) {

		if (allocated)

			sync_inode_page(&dn);
@@ -653,8 +657,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 
		end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));

	}



	if (maxblocks > map->m_len) {

		block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);

	blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);



	if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR) {

		if (create) {
@@ -690,7 +693,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 
		map->m_len++;

		goto get_next;

	}

	}



sync_out:

	if (allocated)

		sync_inode_page(&dn);