Merge tag 'nfs-for-3.19-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

  Features:
   - NFSv4.2 client support for hole punching and preallocation.
   - Further RPC/RDMA client improvements.
   - Add more RPC transport debugging tracepoints.
   - Add RPC debugging tools in debugfs.

  Bugfixes:
   - Stable fix for layoutget error handling
   - Fix a change in COMMIT behaviour resulting from the recent io code
     updates"

* tag 'nfs-for-3.19-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (28 commits)
  sunrpc: add a debugfs rpc_xprt directory with an info file in it
  sunrpc: add debugfs file for displaying client rpc_task queue
  nfs: Add DEALLOCATE support
  nfs: Add ALLOCATE support
  NFS: Clean up nfs4_init_callback()
  NFS: SETCLIENTID XDR buffer sizes are incorrect
  SUNRPC: serialize iostats updates
  xprtrdma: Display async errors
  xprtrdma: Enable pad optimization
  xprtrdma: Re-write rpcrdma_flush_cqs()
  xprtrdma: Refactor tasklet scheduling
  xprtrdma: unmap all FMRs during transport disconnect
  xprtrdma: Cap req_cqinit
  xprtrdma: Return an errno from rpcrdma_register_external()
  nfs: define nfs_inc_fscache_stats and using it as possible
  nfs: replace nfs_add_stats with nfs_inc_stats when add one
  NFS: Deletion of unnecessary checks before the function call "nfs_put_client"
  sunrpc: eliminate RPC_TRACEPOINTS
  sunrpc: eliminate RPC_DEBUG
  lockd: eliminate LOCKD_DEBUG
  ...

1 files changed, 13 insertions, 6 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f83b02dc9166..af3af685a9e3 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -575,7 +575,7 @@ static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, st
         int ret;
 
         nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
-        nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
+        nfs_inc_stats(inode, NFSIOS_WRITEPAGES);
 
         nfs_pageio_cond_complete(pgio, page_file_index(page));
         ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
@@ -670,7 +670,8 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
         nfs_lock_request(req);
 
         spin_lock(&inode->i_lock);
-        if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
+        if (!nfsi->nrequests &&
+            NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
                 inode->i_version++;
         /*
          * Swap-space should not get truncated. Hence no need to plug the race
@@ -681,9 +682,11 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
                 SetPagePrivate(req->wb_page);
                 set_page_private(req->wb_page, (unsigned long)req);
         }
-        nfsi->npages++;
+        nfsi->nrequests++;
         /* this a head request for a page group - mark it as having an
-         * extra reference so sub groups can follow suit */
+         * extra reference so sub groups can follow suit.
+         * This flag also informs pgio layer when to bump nrequests when
+         * adding subrequests. */
         WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
         kref_get(&req->wb_kref);
         spin_unlock(&inode->i_lock);
@@ -709,7 +712,11 @@ static void nfs_inode_remove_request(struct nfs_page *req)
                         wake_up_page(head->wb_page, PG_private);
                         clear_bit(PG_MAPPED, &head->wb_flags);
                 }
-                nfsi->npages--;
+                nfsi->nrequests--;
+                spin_unlock(&inode->i_lock);
+        } else {
+                spin_lock(&inode->i_lock);
+                nfsi->nrequests--;
                 spin_unlock(&inode->i_lock);
         }
 
@@ -1735,7 +1742,7 @@ static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_contr
                 /* Don't commit yet if this is a non-blocking flush and there
                  * are a lot of outstanding writes for this mapping.
                  */
-                if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1))
+                if (nfsi->commit_info.ncommit <= (nfsi->nrequests >> 1))
                         goto out_mark_dirty;
 
                 /* don't wait for the COMMIT response */