1 files changed, 73 insertions, 0 deletions

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 6380b9405bcd..5370f1b9aa43 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -74,6 +74,13 @@ struct pnfs_layoutdriver_type {
 	/* test for nfs page cache coalescing */
 	int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
 
+	/* Returns true if layoutdriver wants to divert this request to
+	 * driver's commit routine.
+	 */
+	bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
+	struct list_head * (*choose_commit_list) (struct nfs_page *req);
+	int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
+
 	/*
 	 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 	 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
@@ -169,6 +176,51 @@ static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 	return nfss->pnfs_curr_ld != NULL;
 }
 
+static inline void
+pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
+{
+	if (lseg) {
+		struct pnfs_layoutdriver_type *ld;
+
+		ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
+		if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
+			set_bit(PG_PNFS_COMMIT, &req->wb_flags);
+			req->wb_commit_lseg = get_lseg(lseg);
+		}
+	}
+}
+
+static inline int
+pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
+{
+	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
+		return PNFS_NOT_ATTEMPTED;
+	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
+}
+
+static inline struct list_head *
+pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
+{
+	struct list_head *rv;
+
+	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
+		struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
+
+		set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
+		rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
+		/* matched by ref taken when PG_PNFS_COMMIT is set */
+		put_lseg(req->wb_commit_lseg);
+	} else
+		rv = mds;
+	return rv;
+}
+
+static inline void pnfs_clear_request_commit(struct nfs_page *req)
+{
+	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
+		put_lseg(req->wb_commit_lseg);
+}
+
 #else  /* CONFIG_NFS_V4_1 */
 
 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
@@ -252,6 +304,27 @@ pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino)
 	pgio->pg_test = NULL;
 }
 
+static inline void
+pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
+{
+}
+
+static inline int
+pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
+{
+	return PNFS_NOT_ATTEMPTED;
+}
+
+static inline struct list_head *
+pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
+{
+	return mds;
+}
+
+static inline void pnfs_clear_request_commit(struct nfs_page *req)
+{
+}
+
 #endif /* CONFIG_NFS_V4_1 */
 
 #endif /* FS_NFS_PNFS_H */