NFSv4.1: coelesce across layout stripes

Add a pg_test layout driver hook which is used to avoid coelescing I/O across
layout stripes.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

6 files changed, 68 insertions, 2 deletions

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 23f930caf1e..0efe8cbd9e3 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -252,6 +252,31 @@ filelayout_free_lseg(struct pnfs_layout_segment *lseg)
         _filelayout_free_lseg(fl);
 }
 
+/*
+ * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
+ *
+ * return 1 :  coalesce page
+ * return 0 :  don't coalesce page
+ */
+int
+filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
+                   struct nfs_page *req)
+{
+        u64 p_stripe, r_stripe;
+        u32 stripe_unit;
+
+        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;
+
+        do_div(p_stripe, stripe_unit);
+        do_div(r_stripe, stripe_unit);
+
+        return (p_stripe == r_stripe);
+}
+
 static struct pnfs_layoutdriver_type filelayout_type = {
         .id = LAYOUT_NFSV4_1_FILES,
         .name = "LAYOUT_NFSV4_1_FILES",
@@ -260,6 +285,7 @@ static struct pnfs_layoutdriver_type filelayout_type = {
         .clear_layoutdriver = filelayout_clear_layoutdriver,
         .alloc_lseg              = filelayout_alloc_lseg,
         .free_lseg               = filelayout_free_lseg,
+        .pg_test                = filelayout_pg_test,
 };
 
 static int __init nfs4filelayout_init(void)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index e1164e3f9e6..9b9a65c9bb4 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -226,6 +226,7 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
         desc->pg_doio = doio;
         desc->pg_ioflags = io_flags;
         desc->pg_error = 0;
+        desc->pg_lseg = NULL;
 }
 
 /**
@@ -240,7 +241,8 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
  * Return 'true' if this is the case, else return 'false'.
  */
 static int nfs_can_coalesce_requests(struct nfs_page *prev,
-                                     struct nfs_page *req)
+                                     struct nfs_page *req,
+                                     struct nfs_pageio_descriptor *pgio)
 {
         if (req->wb_context->cred != prev->wb_context->cred)
                 return 0;
@@ -254,6 +256,12 @@ static int nfs_can_coalesce_requests(struct nfs_page *prev,
                 return 0;
         if (prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
                 return 0;
+        /*
+         * Non-whole file layouts need to check that req is inside of
+         * pgio->pg_lseg.
+         */
+        if (pgio->pg_test && !pgio->pg_test(pgio, prev, req))
+                return 0;
         return 1;
 }
 
@@ -286,7 +294,7 @@ static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
                 if (newlen > desc->pg_bsize)
                         return 0;
                 prev = nfs_list_entry(desc->pg_list.prev);
-                if (!nfs_can_coalesce_requests(prev, req))
+                if (!nfs_can_coalesce_requests(prev, req, desc))
                         return 0;
         } else
                 desc->pg_base = req->wb_pgbase;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 3afa82e4543..330cee115de 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -858,6 +858,22 @@ out_forget_reply:
         goto out;
 }
 
+static void
+pnfs_set_pg_test(struct inode *inode, struct nfs_pageio_descriptor *pgio)
+{
+        struct pnfs_layoutdriver_type *ld;
+
+        ld = NFS_SERVER(inode)->pnfs_curr_ld;
+        pgio->pg_test = (ld ? ld->pg_test : NULL);
+}
+
+void
+pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
+                  struct inode *inode)
+{
+        pnfs_set_pg_test(inode, pgio);
+}
+
 /*
  * Device ID cache. Currently supports one layout type per struct nfs_client.
  * Add layout type to the lookup key to expand to support multiple types.
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 9a994bc9899..db52d965857 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -30,6 +30,8 @@
 #ifndef FS_NFS_PNFS_H
 #define FS_NFS_PNFS_H
 
+#include <linux/nfs_page.h>
+
 enum {
         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
         NFS_LSEG_ROC,           /* roc bit received from server */
@@ -65,6 +67,9 @@ struct pnfs_layoutdriver_type {
         int (*clear_layoutdriver) (struct nfs_server *);
         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
         void (*free_lseg) (struct pnfs_layout_segment *lseg);
+
+        /* test for nfs page cache coalescing */
+        int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
 };
 
 struct pnfs_layout_hdr {
@@ -151,6 +156,7 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
                    enum pnfs_iomode access_type);
 void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
 void unset_pnfs_layoutdriver(struct nfs_server *);
+void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
 int pnfs_layout_process(struct nfs4_layoutget *lgp);
 void pnfs_free_lseg_list(struct list_head *tmp_list);
 void pnfs_destroy_layout(struct nfs_inode *);
@@ -250,6 +256,12 @@ static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 {
 }
 
+static inline void
+pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino)
+{
+        pgio->pg_test = NULL;
+}
+
 #endif /* CONFIG_NFS_V4_1 */
 
 #endif /* FS_NFS_PNFS_H */
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index aedcaa7f291..2a2765975e1 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -626,6 +626,7 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
                 goto read_complete; /* all pages were read */
 
         pnfs_update_layout(inode, desc.ctx, IOMODE_READ);
+        pnfs_pageio_init_read(&pgio, inode);
         if (rsize < PAGE_CACHE_SIZE)
                 nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0);
         else
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index ae528b98b80..40143c4747a 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -28,6 +28,7 @@
 #include "iostat.h"
 #include "nfs4_fs.h"
 #include "fscache.h"
+#include "pnfs.h"
 
 #define NFSDBG_FACILITY         NFSDBG_PAGECACHE
 
@@ -982,6 +983,8 @@ static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 {
         size_t wsize = NFS_SERVER(inode)->wsize;
 
+        pgio->pg_test = NULL;
+
         if (wsize < PAGE_CACHE_SIZE)
                 nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
         else