rbd: define dup_token()

Define a new function dup_token(), to be used during argument
parsing for making dynamically-allocated copies of tokens being
parsed.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 2ae3bb0c0a340f2d3fbb19fbcdc892306008e2ce..384694f40b445c92da247d5b250a2120032c4818 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2280,6 +2280,42 @@ static inline size_t copy_token(const char **buf,
         return len;
 }
 
+/*
+ * Finds the next token in *buf, dynamically allocates a buffer big
+ * enough to hold a copy of it, and copies the token into the new
+ * buffer.  The copy is guaranteed to be terminated with '\0'.  Note
+ * that a duplicate buffer is created even for a zero-length token.
+ *
+ * Returns a pointer to the newly-allocated duplicate, or a null
+ * pointer if memory for the duplicate was not available.  If
+ * the lenp argument is a non-null pointer, the length of the token
+ * (not including the '\0') is returned in *lenp.
+ *
+ * If successful, the *buf pointer will be updated to point beyond
+ * the end of the found token.
+ *
+ * Note: uses GFP_KERNEL for allocation.
+ */
+static inline char *dup_token(const char **buf, size_t *lenp)
+{
+       char *dup;
+       size_t len;
+
+       len = next_token(buf);
+       dup = kmalloc(len + 1, GFP_KERNEL);
+       if (!dup)
+               return NULL;
+
+       memcpy(dup, *buf, len);
+       *(dup + len) = '\0';
+       *buf += len;
+
+       if (lenp)
+               *lenp = len;
+
+       return dup;
+}
+
 /*
  * This fills in the pool_name, obj, obj_len, snap_name, obj_len,
  * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based