nfs: remove ->write_pageio_init from rpc ops

The write_pageio_init method is just a very convoluted way to grab the
right nfs_pageio_ops vector.  The vector to chose is not a choice of
protocol version, but just a pNFS vs MDS I/O choice that can simply be
done inside nfs_pageio_init_write based on the presence of a layout
driver, and a new force_mds flag to the special case of falling back
to MDS I/O on a pNFS-capable volume.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

9 files changed, 17 insertions, 39 deletions

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index b8797ae6831f..6a31102b0819 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -564,7 +564,7 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
         dreq->count = 0;
         get_dreq(dreq);
 
-        NFS_PROTO(dreq->inode)->write_pageio_init(&desc, dreq->inode, FLUSH_STABLE,
+        nfs_pageio_init_write(&desc, dreq->inode, FLUSH_STABLE, false,
                               &nfs_direct_write_completion_ops);
         desc.pg_dreq = dreq;
 
@@ -874,7 +874,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
         size_t requested_bytes = 0;
         unsigned long seg;
 
-        NFS_PROTO(inode)->write_pageio_init(&desc, inode, FLUSH_COND_STABLE,
+        nfs_pageio_init_write(&desc, inode, FLUSH_COND_STABLE, false,
                               &nfs_direct_write_completion_ops);
         desc.pg_dreq = dreq;
         get_dreq(dreq);
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index dd8bfc2e2464..8431083de179 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -422,7 +422,7 @@ int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 
 /* write.c */
 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
-                        struct inode *inode, int ioflags,
+                        struct inode *inode, int ioflags, bool force_mds,
                         const struct nfs_pgio_completion_ops *compl_ops);
 extern struct nfs_write_header *nfs_writehdr_alloc(void);
 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index db60149c4579..e98488053906 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -951,7 +951,6 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
         .read_rpc_prepare = nfs3_proc_read_rpc_prepare,
         .read_done      = nfs3_read_done,
         .write_setup    = nfs3_proc_write_setup,
-        .write_pageio_init = nfs_pageio_init_write,
         .write_rpc_prepare = nfs3_proc_write_rpc_prepare,
         .write_done     = nfs3_write_done,
         .commit_setup   = nfs3_proc_commit_setup,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 397be39c6dc8..8da0c62966b5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8437,7 +8437,6 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
         .read_done      = nfs4_read_done,
         .write_setup    = nfs4_proc_write_setup,
-        .write_pageio_init = pnfs_pageio_init_write,
         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
         .write_done     = nfs4_write_done,
         .commit_setup   = nfs4_proc_commit_setup,
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index cb53d450ae32..9edac9f01c2a 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1447,20 +1447,6 @@ pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
                 nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
 }
 
-void
-pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
-                       int ioflags,
-                       const struct nfs_pgio_completion_ops *compl_ops)
-{
-        struct nfs_server *server = NFS_SERVER(inode);
-        struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
-
-        if (ld == NULL)
-                nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
-        else
-                nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
-}
-
 bool
 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
                      struct nfs_page *req)
@@ -1496,7 +1482,7 @@ int pnfs_write_done_resend_to_mds(struct inode *inode,
         LIST_HEAD(failed);
 
         /* Resend all requests through the MDS */
-        nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
+        nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, true, compl_ops);
         pgio.pg_dreq = dreq;
         while (!list_empty(head)) {
                 struct nfs_page *req = nfs_list_entry(head->next);
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 023793909778..e9ac8fbaee3d 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -182,8 +182,6 @@ void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 
 void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *,
                            const struct nfs_pgio_completion_ops *);
-void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *,
-                            int, const struct nfs_pgio_completion_ops *);
 
 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 void unset_pnfs_layoutdriver(struct nfs_server *);
@@ -467,12 +465,6 @@ static inline void pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, str
         nfs_pageio_init_read(pgio, inode, compl_ops);
 }
 
-static inline void pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
-                                          const struct nfs_pgio_completion_ops *compl_ops)
-{
-        nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
-}
-
 static inline int
 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
                  struct nfs_commit_info *cinfo)
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index e55ce9e8b034..f9cc29590a18 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -739,7 +739,6 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
         .read_rpc_prepare = nfs_proc_read_rpc_prepare,
         .read_done      = nfs_read_done,
         .write_setup    = nfs_proc_write_setup,
-        .write_pageio_init = nfs_pageio_init_write,
         .write_rpc_prepare = nfs_proc_write_rpc_prepare,
         .write_done     = nfs_write_done,
         .commit_setup   = nfs_proc_commit_setup,
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index cd7c651f9b84..ee6d46fde76c 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -354,10 +354,8 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc
         struct nfs_pageio_descriptor pgio;
         int err;
 
-        NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
-                                                          page->mapping->host,
-                                                          wb_priority(wbc),
-                                                          &nfs_async_write_completion_ops);
+        nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc),
+                                false, &nfs_async_write_completion_ops);
         err = nfs_do_writepage(page, wbc, &pgio);
         nfs_pageio_complete(&pgio);
         if (err < 0)
@@ -400,7 +398,8 @@ int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
 
         nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
 
-        NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
+        nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
+                                &nfs_async_write_completion_ops);
         err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
         nfs_pageio_complete(&pgio);
 
@@ -1282,11 +1281,17 @@ static const struct nfs_pageio_ops nfs_pageio_write_ops = {
 };
 
 void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
-                               struct inode *inode, int ioflags,
+                               struct inode *inode, int ioflags, bool force_mds,
                                const struct nfs_pgio_completion_ops *compl_ops)
 {
-        nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
-                                NFS_SERVER(inode)->wsize, ioflags);
+        struct nfs_server *server = NFS_SERVER(inode);
+        const struct nfs_pageio_ops *pg_ops = &nfs_pageio_write_ops;
+
+#ifdef CONFIG_NFS_V4_1
+        if (server->pnfs_curr_ld && !force_mds)
+                pg_ops = server->pnfs_curr_ld->pg_write_ops;
+#endif
+        nfs_pageio_init(pgio, inode, pg_ops, compl_ops, server->wsize, ioflags);
 }
 EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
 
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 6fb5b2335b59..78216f859527 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1471,8 +1471,6 @@ struct nfs_rpc_ops {
         int     (*read_rpc_prepare)(struct rpc_task *, struct nfs_read_data *);
         int     (*read_done)  (struct rpc_task *, struct nfs_read_data *);
         void    (*write_setup)  (struct nfs_write_data *, struct rpc_message *);
-        void    (*write_pageio_init)(struct nfs_pageio_descriptor *, struct inode *, int,
-                                     const struct nfs_pgio_completion_ops *);
         int     (*write_rpc_prepare)(struct rpc_task *, struct nfs_write_data *);
         int     (*write_done)  (struct rpc_task *, struct nfs_write_data *);
         void    (*commit_setup) (struct nfs_commit_data *, struct rpc_message *);