[PATCH 3.19 160/177] Revert "nfs: replace nfs_add_stats with nfs_inc_stats when add one"

[Greg Kroah-Hartman]

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>

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).

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>
Fixes: 5a254d08b086 ("nfs: replace nfs_add_stats with nfs_inc_stats...")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -269,7 +269,7 @@ 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..
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -575,7 +575,7 @@ 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);


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