NFSv4.1: Fall back to ordinary i/o through the mds if we have no layout segment
Trond Myklebust [Fri, 10 Jun 2011 17:30:23 +0000 (13:30 -0400)]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/internal.h
fs/nfs/nfs4filelayout.c
fs/nfs/objlayout/objio_osd.c
fs/nfs/pnfs.c
fs/nfs/read.c
fs/nfs/write.c

index fc017ea..31e8b50 100644 (file)
@@ -296,7 +296,13 @@ extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
                             const struct rpc_call_ops *call_ops);
 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 
+struct nfs_pageio_descriptor;
+extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
+               struct inode *inode);
+
 /* write.c */
+extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
+                                 struct inode *inode, int ioflags);
 extern void nfs_commit_free(struct nfs_write_data *p);
 extern int nfs_initiate_write(struct nfs_write_data *data,
                              struct rpc_clnt *clnt,
index faac87f..d1ae5bf 100644 (file)
@@ -669,8 +669,6 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
            !nfs_generic_pg_test(pgio, prev, req))
                return false;
 
-       if (!pgio->pg_lseg)
-               return 1;
        p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
        r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
        stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
index b759aeb..70272d5 100644 (file)
@@ -1000,9 +1000,6 @@ static bool objio_pg_test(struct nfs_pageio_descriptor *pgio,
        if (!pnfs_generic_pg_test(pgio, prev, req))
                return false;
 
-       if (pgio->pg_lseg == NULL)
-               return true;
-
        return pgio->pg_count + req->wb_bytes <=
                        OBJIO_LSEG(pgio->pg_lseg)->max_io_size;
 }
index 69a0c3f..cc807fe 100644 (file)
@@ -1066,6 +1066,10 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
                                           req->wb_bytes,
                                           IOMODE_READ,
                                           GFP_KERNEL);
+       /* If no lseg, fall back to read through mds */
+       if (pgio->pg_lseg == NULL)
+               nfs_pageio_init_read_mds(pgio, pgio->pg_inode);
+
 }
 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
 
@@ -1080,6 +1084,9 @@ pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *
                                           req->wb_bytes,
                                           IOMODE_RW,
                                           GFP_NOFS);
+       /* If no lseg, fall back to write through mds */
+       if (pgio->pg_lseg == NULL)
+               nfs_pageio_init_write_mds(pgio, pgio->pg_inode, pgio->pg_ioflags);
 }
 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
 
index 2cf728b..9b2a1d7 100644 (file)
@@ -114,7 +114,7 @@ static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data)
        }
 }
 
-static void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
+void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
                struct inode *inode)
 {
        nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops,
index d1ae7e4..00940dc 100644 (file)
@@ -1040,7 +1040,7 @@ static const struct nfs_pageio_ops nfs_pageio_write_ops = {
        .pg_doio = nfs_generic_pg_writepages,
 };
 
-static void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
+void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
                                  struct inode *inode, int ioflags)
 {
        nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops,