fs.h: Add TRACE_IOCB_STRINGS for use in trace points

Add TRACE_IOCB_STRINGS macro which can be used in the trace point patch to
print different flag values with meaningful string output.

Tested-by: Disha Goel <disgoel@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: line up strings all prettylike]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c85916e..75d24fa 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -340,6 +340,20 @@ enum rw_hint {
 /* can use bio alloc cache */
 #define IOCB_ALLOC_CACHE       (1 << 21)
 
+/* for use in trace events */
+#define TRACE_IOCB_STRINGS \
+       { IOCB_HIPRI,           "HIPRI" }, \
+       { IOCB_DSYNC,           "DSYNC" }, \
+       { IOCB_SYNC,            "SYNC" }, \
+       { IOCB_NOWAIT,          "NOWAIT" }, \
+       { IOCB_APPEND,          "APPEND" }, \
+       { IOCB_EVENTFD,         "EVENTFD"}, \
+       { IOCB_DIRECT,          "DIRECT" }, \
+       { IOCB_WRITE,           "WRITE" }, \
+       { IOCB_WAITQ,           "WAITQ" }, \
+       { IOCB_NOIO,            "NOIO" }, \
+       { IOCB_ALLOC_CACHE,     "ALLOC_CACHE" }
+
 struct kiocb {
        struct file             *ki_filp;
        loff_t                  ki_pos;