NFS: Remove call to igrab() from nfs_writepage()

We always ensure that the nfs_open_context holds a reference to the dentry,
so the test in nfs_writepage() for whether or not the inode is referenced
is redundant.

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

1 files changed, 1 insertions, 15 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 3f6ca522956..74e86601d97 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -317,24 +317,12 @@ int nfs_writepage(struct page *page, struct writeback_control *wbc)
         struct nfs_open_context *ctx;
         struct inode *inode = page->mapping->host;
         unsigned offset;
-        int inode_referenced = 0;
         int priority = wb_priority(wbc);
         int err;
 
         nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
         nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
 
-        /*
-         * Note: We need to ensure that we have a reference to the inode
-         *       if we are to do asynchronous writes. If not, waiting
-         *       in nfs_wait_on_request() may deadlock with clear_inode().
-         *
-         *       If igrab() fails here, then it is in any case safe to
-         *       call nfs_wb_page(), since there will be no pending writes.
-         */
-        if (igrab(inode) != 0)
-                inode_referenced = 1;
-
         /* Ensure we've flushed out any previous writes */
         nfs_wb_page_priority(inode, page, priority);
 
@@ -349,7 +337,7 @@ int nfs_writepage(struct page *page, struct writeback_control *wbc)
                 goto out;
         }
         lock_kernel();
-        if (!IS_SYNC(inode) && inode_referenced) {
+        if (!IS_SYNC(inode)) {
                 err = nfs_writepage_async(ctx, inode, page, 0, offset);
                 if (!wbc->for_writepages)
                         nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc));
@@ -366,8 +354,6 @@ int nfs_writepage(struct page *page, struct writeback_control *wbc)
         put_nfs_open_context(ctx);
 out:
         unlock_page(page);
-        if (inode_referenced)
-                iput(inode);
         return err; 
 }