NFSv4.1: Add an initialisation callback for pNFS
Ensure that we always get a layout before setting up the i/o request.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 7ec46d5..69a0c3f 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -911,7 +911,7 @@
* Layout segment is retreived from the server if not cached.
* The appropriate layout segment is referenced and returned to the caller.
*/
-struct pnfs_layout_segment *
+static struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino,
struct nfs_open_context *ctx,
loff_t pos,
@@ -1055,6 +1055,34 @@
goto out;
}
+void
+pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+{
+ BUG_ON(pgio->pg_lseg != NULL);
+
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ req_offset(req),
+ req->wb_bytes,
+ IOMODE_READ,
+ GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
+
+void
+pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+{
+ BUG_ON(pgio->pg_lseg != NULL);
+
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ req_offset(req),
+ req->wb_bytes,
+ IOMODE_RW,
+ GFP_NOFS);
+}
+EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
+
bool
pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
{
@@ -1083,31 +1111,8 @@
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
- enum pnfs_iomode access_type;
- gfp_t gfp_flags;
-
- /* We assume that pg_ioflags == 0 iff we're reading a page */
- if (pgio->pg_ioflags == 0) {
- access_type = IOMODE_READ;
- gfp_flags = GFP_KERNEL;
- } else {
- access_type = IOMODE_RW;
- gfp_flags = GFP_NOFS;
- }
-
- if (pgio->pg_lseg == NULL) {
- if (pgio->pg_count != prev->wb_bytes)
- return true;
- /* This is first coelesce call for a series of nfs_pages */
- pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
- prev->wb_context,
- req_offset(prev),
- pgio->pg_count,
- access_type,
- gfp_flags);
- if (pgio->pg_lseg == NULL)
- return true;
- }
+ if (pgio->pg_lseg == NULL)
+ return nfs_generic_pg_test(pgio, prev, req);
/*
* Test if a nfs_page is fully contained in the pnfs_layout_range.