Merge branch 'for-3.19' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "A comparatively quieter cycle for nfsd this time, but still with two
  larger changes:

   - RPC server scalability improvements from Jeff Layton (using RCU
     instead of a spinlock to find idle threads).

   - server-side NFSv4.2 ALLOCATE/DEALLOCATE support from Anna
     Schumaker, enabling fallocate on new clients"

* 'for-3.19' of git://linux-nfs.org/~bfields/linux: (32 commits)
  nfsd4: fix xdr4 count of server in fs_location4
  nfsd4: fix xdr4 inclusion of escaped char
  sunrpc/cache: convert to use string_escape_str()
  sunrpc: only call test_bit once in svc_xprt_received
  fs: nfsd: Fix signedness bug in compare_blob
  sunrpc: add some tracepoints around enqueue and dequeue of svc_xprt
  sunrpc: convert to lockless lookup of queued server threads
  sunrpc: fix potential races in pool_stats collection
  sunrpc: add a rcu_head to svc_rqst and use kfree_rcu to free it
  sunrpc: require svc_create callers to pass in meaningful shutdown routine
  sunrpc: have svc_wake_up only deal with pool 0
  sunrpc: convert sp_task_pending flag to use atomic bitops
  sunrpc: move rq_cachetype field to better optimize space
  sunrpc: move rq_splice_ok flag into rq_flags
  sunrpc: move rq_dropme flag into rq_flags
  sunrpc: move rq_usedeferral flag to rq_flags
  sunrpc: move rq_local field to rq_flags
  sunrpc: add a generic rq_flags field to svc_rqst and move rq_secure to it
  nfsd: minor off by one checks in __write_versions()
  sunrpc: release svc_pool_map reference when serv allocation fails
  ...

1 files changed, 6 insertions, 20 deletions

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 066362141133..33fb105d4352 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -20,6 +20,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/string_helpers.h>
 #include <asm/uaccess.h>
 #include <linux/poll.h>
 #include <linux/seq_file.h>
@@ -1067,30 +1068,15 @@ void qword_add(char **bpp, int *lp, char *str)
 {
 	char *bp = *bpp;
 	int len = *lp;
-	char c;
+	int ret;
 
 	if (len < 0) return;
 
-	while ((c=*str++) && len)
-		switch(c) {
-		case ' ':
-		case '\t':
-		case '\n':
-		case '\\':
-			if (len >= 4) {
-				*bp++ = '\\';
-				*bp++ = '0' + ((c & 0300)>>6);
-				*bp++ = '0' + ((c & 0070)>>3);
-				*bp++ = '0' + ((c & 0007)>>0);
-			}
-			len -= 4;
-			break;
-		default:
-			*bp++ = c;
-			len--;
-		}
-	if (c || len <1) len = -1;
+	ret = string_escape_str(str, &bp, len, ESCAPE_OCTAL, "\\ \n\t");
+	if (ret < 0 || ret == len)
+		len = -1;
 	else {
+		len -= ret;
 		*bp++ = ' ';
 		len--;
 	}