2 files changed, 47 insertions, 26 deletions

diff --git a/Documentation/dynamic-debug-howto.txt b/Documentation/dynamic-debug-howto.txt
index 68394825e86b..674c5663d346 100644
--- a/Documentation/dynamic-debug-howto.txt
+++ b/Documentation/dynamic-debug-howto.txt
@@ -49,10 +49,10 @@ via:
 
 nullarbor:~ # cat <debugfs>/dynamic_debug/control
 # filename:lineno [module]function flags format
-/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup - "SVCRDMA\040Module\040Removed,\040deregister\040RPC\040RDMA\040transport\012"
-/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init - "\011max_inline\040\040\040\040\040\040\040:\040%d\012"
-/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init - "\011sq_depth\040\040\040\040\040\040\040\040\040:\040%d\012"
-/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init - "\011max_requests\040\040\040\040\040:\040%d\012"
+/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup - "SVCRDMA Module Removed, deregister RPC RDMA transport\012"
+/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init - "\011max_inline       : %d\012"
+/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init - "\011sq_depth         : %d\012"
+/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init - "\011max_requests     : %d\012"
 ...
 
 
@@ -72,7 +72,7 @@ you can view all the debug statement callsites with any non-default flags:
 
 nullarbor:~ # awk '$3 != "-"' <debugfs>/dynamic_debug/control
 # filename:lineno [module]function flags format
-/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p "svc_process:\040st_sendto\040returned\040%d\012"
+/usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p "svc_process: st_sendto returned %d\012"
 
 
 Command Language Reference
@@ -166,11 +166,15 @@ format
     entire format, only some part.  Whitespace and other
     special characters can be escaped using C octal character
     escape \ooo notation, e.g. the space character is \040.
+    Alternatively, the string can be enclosed in double quote
+    characters (") or single quote characters (').
     Examples:
 
     format svcrdma:         // many of the NFS/RDMA server dprintks
     format readahead        // some dprintks in the readahead cache
-    format nfsd:\040SETATTR // how to match a format with whitespace
+    format nfsd:\040SETATTR // one way to match a format with whitespace
+    format "nfsd: SETATTR"  // a neater way to match a format with whitespace
+    format 'nfsd: SETATTR'  // yet another way to match a format with whitespace
 
 line
     The given line number or range of line numbers is compared
@@ -230,3 +234,7 @@ nullarbor:~ # echo -n 'func svc_process +p' >
 // disable all 12 messages in the function svc_process()
 nullarbor:~ # echo -n 'func svc_process -p' >
                                 <debugfs>/dynamic_debug/control
+
+// enable messages for NFS calls READ, READLINK, READDIR and READDIR+.
+nullarbor:~ # echo -n 'format "nfsd: READ" +p' >
+                                <debugfs>/dynamic_debug/control
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 9e123ae326bc..833139ce1e22 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -196,32 +196,45 @@ static void ddebug_change(const struct ddebug_query *query,
 }
 
 /*
- * Wrapper around strsep() to collapse the multiple empty tokens
- * that it returns when fed sequences of separator characters.
- * Now, if we had strtok_r()...
- */
-static inline char *nearly_strtok_r(char **p, const char *sep)
-{
-        char *r;
-
-        while ((r = strsep(p, sep)) != NULL && *r == '\0')
-                ;
-        return r;
-}
-
-/*
  * Split the buffer `buf' into space-separated words.
- * Return the number of such words or <0 on error.
+ * Handles simple " and ' quoting, i.e. without nested,
+ * embedded or escaped \".  Return the number of words
+ * or <0 on error.
  */
 static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 {
         int nwords = 0;
 
-        while (nwords < maxwords &&
-               (words[nwords] = nearly_strtok_r(&buf, " \t\r\n")) != NULL)
-                nwords++;
-        if (buf)
-                return -EINVAL; /* ran out of words[] before bytes */
+        while (*buf) {
+                char *end;
+
+                /* Skip leading whitespace */
+                while (*buf && isspace(*buf))
+                        buf++;
+                if (!*buf)
+                        break;  /* oh, it was trailing whitespace */
+
+                /* Run `end' over a word, either whitespace separated or quoted */
+                if (*buf == '"' || *buf == '\'') {
+                        int quote = *buf++;
+                        for (end = buf ; *end && *end != quote ; end++)
+                                ;
+                        if (!*end)
+                                return -EINVAL; /* unclosed quote */
+                } else {
+                        for (end = buf ; *end && !isspace(*end) ; end++)
+                                ;
+                        BUG_ON(end == buf);
+                }
+                /* Here `buf' is the start of the word, `end' is one past the end */
+
+                if (nwords == maxwords)
+                        return -EINVAL; /* ran out of words[] before bytes */
+                if (*end)
+                        *end++ = '\0';  /* terminate the word */
+                words[nwords++] = buf;
+                buf = end;
+        }
 
         if (verbose) {
                 int i;