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-rw-r--r--include/linux/kfifo.h3
-rw-r--r--kernel/kfifo.c21
2 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index 86ad50a900c8..7ad6d32dd673 100644
--- a/include/linux/kfifo.h
+++ b/include/linux/kfifo.h
@@ -113,6 +113,9 @@ extern unsigned int kfifo_in(struct kfifo *fifo,
const void *from, unsigned int len);
extern __must_check unsigned int kfifo_out(struct kfifo *fifo,
void *to, unsigned int len);
+extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
+ void *to, unsigned int len, unsigned offset);
+
/**
* kfifo_reset - removes the entire FIFO contents
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index b50bb622e8b0..7384f120be87 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -302,6 +302,27 @@ unsigned int kfifo_out(struct kfifo *fifo, void *to, unsigned int len)
}
EXPORT_SYMBOL(kfifo_out);
+/**
+ * kfifo_out_peek - copy some data from the FIFO, but do not remove it
+ * @fifo: the fifo to be used.
+ * @to: where the data must be copied.
+ * @len: the size of the destination buffer.
+ * @offset: offset into the fifo
+ *
+ * This function copies at most @len bytes at @offset from the FIFO
+ * into the @to buffer and returns the number of copied bytes.
+ * The data is not removed from the FIFO.
+ */
+unsigned int kfifo_out_peek(struct kfifo *fifo, void *to, unsigned int len,
+ unsigned offset)
+{
+ len = min(kfifo_len(fifo), len + offset);
+
+ __kfifo_out_data(fifo, to, len, offset);
+ return len;
+}
+EXPORT_SYMBOL(kfifo_out_peek);
+
unsigned int __kfifo_out_generic(struct kfifo *fifo,
void *to, unsigned int len, unsigned int recsize,
unsigned int *total)