Commit ac6f1999 authored Jun 16, 2016 by Jaegeuk Kim

f2fs: avoid latency-critical readahead of node pages



The f2fs_map_blocks is very related to the performance, so let's avoid any
latency to read ahead node pages.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 2c237eba

fs/f2fs/data.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -652,7 +652,7 @@ int f2fs_map_blocks(struct inode inode, struct f2fs_map_blocks map,
		unsigned int maxblocks = map->m_len;
		struct dnode_of_data dn;
		struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
		int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
		int mode = create ? ALLOC_NODE : LOOKUP_NODE;
		pgoff_t pgofs, end_offset, end;
		int err = 0, ofs = 1;
		unsigned int ofs_in_node, last_ofs_in_node;

fs/f2fs/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -354,7 +354,7 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)

		for (; data_ofs < isize; data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
		err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE);
		if (err && err != -ENOENT) {
		goto fail;
		} else if (err == -ENOENT) {