NFS: refactor nfs_direct_free_user_pages

Clean-up and fix a minor bug: the logic was dirtying page cache pages on
both read and write operations.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 15 insertions, 8 deletions

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index e4c9e03aff1..4cb3446220b 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -126,16 +126,21 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_
         return -EINVAL;
 }
 
-static void nfs_free_user_pages(struct page **pages, int npages, int do_dirty)
+static void nfs_direct_dirty_pages(struct page **pages, int npages)
 {
         int i;
         for (i = 0; i < npages; i++) {
                 struct page *page = pages[i];
-                if (do_dirty && !PageCompound(page))
+                if (!PageCompound(page))
                         set_page_dirty_lock(page);
-                page_cache_release(page);
         }
-        kfree(pages);
+}
+
+static void nfs_direct_release_pages(struct page **pages, int npages)
+{
+        int i;
+        for (i = 0; i < npages; i++)
+                page_cache_release(pages[i]);
 }
 
 static inline int nfs_get_user_pages(int rw, unsigned long user_addr, size_t size, struct page ***pages)
@@ -162,7 +167,7 @@ static inline int nfs_get_user_pages(int rw, unsigned long user_addr, size_t siz
                          * end of a mapping; return EFAULT.
                          */
                         if (result >= 0) {
-                                nfs_free_user_pages(*pages, result, 0);
+                                nfs_direct_release_pages(*pages, result);
                                 result = -EFAULT;
                         } else
                                 kfree(*pages);
@@ -238,8 +243,6 @@ out:
  */
 static void nfs_direct_complete(struct nfs_direct_req *dreq)
 {
-        nfs_free_user_pages(dreq->pages, dreq->npages, 1);
-
         if (dreq->iocb) {
                 long res = (long) dreq->error;
                 if (!res)
@@ -311,8 +314,11 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
 
         spin_unlock(&dreq->lock);
 
-        if (put_dreq(dreq))
+        if (put_dreq(dreq)) {
+                nfs_direct_dirty_pages(dreq->pages, dreq->npages);
+                nfs_direct_release_pages(dreq->pages, dreq->npages);
                 nfs_direct_complete(dreq);
+        }
 }
 
 static const struct rpc_call_ops nfs_read_direct_ops = {
@@ -422,6 +428,7 @@ static void nfs_direct_free_writedata(struct nfs_direct_req *dreq)
                 list_del(&data->pages);
                 nfs_writedata_release(data);
         }
+        nfs_direct_release_pages(dreq->pages, dreq->npages);
 }
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)