NFS: Remove all NFSIOS_FSCACHE counters due to conversion to netfs API

The old NFSIOS_FSCACHE counters are no longer accurate or useful with
the conversion to the new netfs API.  The new API does not have a page
based interface, and so the counters in nfs_stat_fscachecounters are
no longer obtainable.  The new netfs the API has extensive statistics
inside /proc/fs/fscache/stats so we no longer need NFS specific fscache
stats.

Note this also removes the 'fsc:' line from /proc/self/mountstats so
it will be a user-visible change.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Daire Byrne <daire@dneg.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

Author: DaveWysochanskiRH

fs/nfs/iostat.h

@@ -17,9 +17,6 @@
 
 struct nfs_iostats {
 	unsigned long long	bytes[__NFSIOS_BYTESMAX];
-#ifdef CONFIG_NFS_FSCACHE
-	unsigned long long	fscache[__NFSIOS_FSCACHEMAX];
-#endif
 	unsigned long		events[__NFSIOS_COUNTSMAX];
 } ____cacheline_aligned;
 
@@ -49,20 +46,6 @@ static inline void nfs_add_stats(const struct inode *inode,
 	nfs_add_server_stats(NFS_SERVER(inode), stat, addend);
 }
 
-#ifdef CONFIG_NFS_FSCACHE
-static inline void nfs_add_fscache_stats(struct inode *inode,
-					 enum nfs_stat_fscachecounters stat,
-					 long addend)
-{
-	this_cpu_add(NFS_SERVER(inode)->io_stats->fscache[stat], addend);
-}
-static inline void nfs_inc_fscache_stats(struct inode *inode,
-					 enum nfs_stat_fscachecounters stat)
-{
-	this_cpu_inc(NFS_SERVER(inode)->io_stats->fscache[stat]);
-}
-#endif
-
 static inline struct nfs_iostats __percpu *nfs_alloc_iostats(void)
 {
 	return alloc_percpu(struct nfs_iostats);

fs/nfs/super.c

@@ -692,10 +692,6 @@ int nfs_show_stats(struct seq_file *m, struct dentry *root)
 			totals.events[i] += stats->events[i];
 		for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 			totals.bytes[i] += stats->bytes[i];
-#ifdef CONFIG_NFS_FSCACHE
-		for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
-			totals.fscache[i] += stats->fscache[i];
-#endif
 
 		preempt_enable();
 	}
@@ -706,13 +702,6 @@ int nfs_show_stats(struct seq_file *m, struct dentry *root)
 	seq_puts(m, "\n\tbytes:\t");
 	for (i = 0; i < __NFSIOS_BYTESMAX; i++)
 		seq_printf(m, "%Lu ", totals.bytes[i]);
-#ifdef CONFIG_NFS_FSCACHE
-	if (nfss->options & NFS_OPTION_FSCACHE) {
-		seq_puts(m, "\n\tfsc:\t");
-		for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
-			seq_printf(m, "%Lu ", totals.fscache[i]);
-	}
-#endif
 	seq_putc(m, '\n');
 
 	rpc_clnt_show_stats(m, nfss->client);

include/linux/nfs_iostat.h

@@ -119,16 +119,4 @@ enum nfs_stat_eventcounters {
 	__NFSIOS_COUNTSMAX,
 };
 
-/*
- * NFS local caching servicing counters
- */
-enum nfs_stat_fscachecounters {
-	NFSIOS_FSCACHE_PAGES_READ_OK,
-	NFSIOS_FSCACHE_PAGES_READ_FAIL,
-	NFSIOS_FSCACHE_PAGES_WRITTEN_OK,
-	NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL,
-	NFSIOS_FSCACHE_PAGES_UNCACHED,
-	__NFSIOS_FSCACHEMAX,
-};
-
 #endif	/* _LINUX_NFS_IOSTAT */