nilfs2: add update functions of virtual block address to dat
This is a preparation for the successive cleanup ("nilfs2: allow btree
to directly call dat operations").
This adds functions bundling a few operations to change an entry of
virtual block address on the dat file.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c
index 1cfcc1a..1ff8e15 100644
--- a/fs/nilfs2/dat.c
+++ b/fs/nilfs2/dat.c
@@ -211,6 +211,37 @@
nilfs_dat_abort_entry(dat, req);
}
+int nilfs_dat_prepare_update(struct inode *dat,
+ struct nilfs_palloc_req *oldreq,
+ struct nilfs_palloc_req *newreq)
+{
+ int ret;
+
+ ret = nilfs_dat_prepare_end(dat, oldreq);
+ if (!ret) {
+ ret = nilfs_dat_prepare_alloc(dat, newreq);
+ if (ret < 0)
+ nilfs_dat_abort_end(dat, oldreq);
+ }
+ return ret;
+}
+
+void nilfs_dat_commit_update(struct inode *dat,
+ struct nilfs_palloc_req *oldreq,
+ struct nilfs_palloc_req *newreq, int dead)
+{
+ nilfs_dat_commit_end(dat, oldreq, dead);
+ nilfs_dat_commit_alloc(dat, newreq);
+}
+
+void nilfs_dat_abort_update(struct inode *dat,
+ struct nilfs_palloc_req *oldreq,
+ struct nilfs_palloc_req *newreq)
+{
+ nilfs_dat_abort_end(dat, oldreq);
+ nilfs_dat_abort_alloc(dat, newreq);
+}
+
/**
* nilfs_dat_mark_dirty -
* @dat: DAT file inode
