Patch "Revert "nfs: replace nfs_add_stats with nfs_inc_stats when add one"" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

Revert "nfs: replace nfs_add_stats with nfs_inc_stats when add one"

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
revert-nfs-replace-nfs_add_stats-with-nfs_inc_stats-when-add-one.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nicolas Iooss <[email protected]>
Date: Thu, 16 Apr 2015 18:48:39 +0800
Subject: Revert "nfs: replace nfs_add_stats with nfs_inc_stats when add one"

From: Nicolas Iooss <[email protected]>

commit 3708f842e107b9b79d54a75d152e666b693649e8 upstream.

This reverts commit 5a254d08b086d80cbead2ebcee6d2a4b3a15587a.

Since commit 5a254d08b086 ("nfs: replace nfs_add_stats with nfs_inc_stats when add one"), nfs_readpage and nfs_do_writepage use nfs_inc_stats to increment NFSIOS_READPAGES and NFSIOS_WRITEPAGES instead of nfs_add_stats.

However nfs_inc_stats does not do the same thing as nfs_add_stats with value 1 because these functions work on distinct stats:
nfs_inc_stats increments stats from "enum nfs_stat_eventcounters" (in server->io_stats->events) and nfs_add_stats those from "enum nfs_stat_bytecounters" (in server->io_stats->bytes).

---
 fs/nfs/read.c  |    2 +-
 fs/nfs/write.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

@@ -284,7 +284,7 @@ int nfs_readpage(struct file *file, stru
 	dprintk("NFS: nfs_readpage (%p %ld@%lu)\n",
 		page, PAGE_CACHE_SIZE, page_file_index(page));
 	nfs_inc_stats(inode, NFSIOS_VFSREADPAGE);
-	nfs_inc_stats(inode, NFSIOS_READPAGES);
+	nfs_add_stats(inode, NFSIOS_READPAGES, 1);
 
 	/*
 	 * Try to flush any pending writes to the file..

@@ -580,7 +580,7 @@ static int nfs_do_writepage(struct page
 	int ret;
 
 	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
-	nfs_inc_stats(inode, NFSIOS_WRITEPAGES);
+	nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
 
 	nfs_pageio_cond_complete(pgio, page_file_index(page));
 	ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/revert-nfs-replace-nfs_add_stats-with-nfs_inc_stats-when-add-one.patch