NFS41: add pg_layout_private to nfs_pageio_descriptor

To allow layout driver to pass private information around
pg_init/pg_doio.

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 4 insertions, 0 deletions

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 1a6732ed04a4..311a79681e2b 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -49,6 +49,7 @@ void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
         hdr->io_start = req_offset(hdr->req);
         hdr->good_bytes = desc->pg_count;
         hdr->dreq = desc->pg_dreq;
+        hdr->layout_private = desc->pg_layout_private;
         hdr->release = release;
         hdr->completion_ops = desc->pg_completion_ops;
         if (hdr->completion_ops->init_hdr)
@@ -268,6 +269,7 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
         desc->pg_error = 0;
         desc->pg_lseg = NULL;
         desc->pg_dreq = NULL;
+        desc->pg_layout_private = NULL;
 }
 EXPORT_SYMBOL_GPL(nfs_pageio_init);
 
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 880805774f9f..92ce5783b707 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -69,6 +69,7 @@ struct nfs_pageio_descriptor {
         const struct nfs_pgio_completion_ops *pg_completion_ops;
         struct pnfs_layout_segment *pg_lseg;
         struct nfs_direct_req   *pg_dreq;
+        void                    *pg_layout_private;
 };
 
 #define NFS_WBACK_BUSY(req)     (test_bit(PG_BUSY,&(req)->wb_flags))
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 00485e084394..ac7c8ae254f2 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1248,6 +1248,7 @@ struct nfs_pgio_header {
         void (*release) (struct nfs_pgio_header *hdr);
         const struct nfs_pgio_completion_ops *completion_ops;
         struct nfs_direct_req   *dreq;
+        void                    *layout_private;
         spinlock_t              lock;
         /* fields protected by lock */
         int                     pnfs_error;