nilfs2: add read ahead mode to nilfs_btnode_submit_block

This adds mode argument to nilfs_btnode_submit_block() function and
allows it to issue a read-ahead request.

An optional submit_ptr argument is also added to store the actual
block address for which bio is sent.  submit_ptr is used for a series
of read-ahead requests, and helps to decide if each requested block is
continous to the previous one on disk.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index b6343825f91a..bed3a783129b 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -151,8 +151,10 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
 int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
                                    __u64 vbn, struct buffer_head **out_bh)
 {
-        int ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
-                                            vbn ? : pbn, pbn, out_bh);
+        int ret;
+
+        ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
+                                        vbn ? : pbn, pbn, READ, out_bh, &pbn);
         if (ret == -EEXIST) /* internal code (cache hit) */
                 ret = 0;
         return ret;