meta: export process state dump

Various parts of process state dump are exposed
through most appropriate virual files/dirs

Change-Id: Iff30f8ea76552f2f6d9c98def688c5ec4bc6f2af
BUG: 1089216
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/7542
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Harshavardhana <harsha@harshavardhana.net>

1 files changed, 92 insertions, 0 deletions

diff --git a/xlators/meta/src/measure-file.c b/xlators/meta/src/measure-file.c
new file mode 100644
index 00000000000..ccc78232dfe
--- /dev/null
+++ b/xlators/meta/src/measure-file.c
@@ -0,0 +1,92 @@
+/*
+   Copyright (c) 2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "defaults.h"
+
+#include "meta-mem-types.h"
+#include "meta.h"
+#include "strfd.h"
+
+
+static int
+measure_file_fill (xlator_t *this, inode_t *file, strfd_t *strfd)
+{
+	strprintf (strfd, "%d\n", this->ctx->measure_latency);
+
+	return strfd->size;
+}
+
+
+static int
+measure_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
+		struct iovec *iov, int count, off_t offset,
+		uint32_t flags, struct iobref *iobref, dict_t *xdata)
+{
+	struct iatt dummy = { };
+	long int num = -1;
+
+	num = strtol (iov[0].iov_base, NULL, 0);
+	this->ctx->measure_latency = !!num;
+
+	META_STACK_UNWIND (writev, frame, iov_length (iov, count), 0,
+			   &dummy, &dummy, xdata);
+	return 0;
+}
+
+
+int
+measure_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc,
+		   off_t offset, dict_t *xdata)
+{
+	struct iatt iatt = { };
+
+	meta_iatt_fill (&iatt, loc->inode, IA_IFREG);
+
+	META_STACK_UNWIND (truncate, frame, 0, 0, &iatt, &iatt, xdata);
+	return 0;
+}
+
+
+int
+measure_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd,
+		   off_t offset, dict_t *xdata)
+{
+	struct iatt iatt = { };
+
+	meta_iatt_fill (&iatt, fd->inode, IA_IFREG);
+
+	META_STACK_UNWIND (ftruncate, frame, 0, 0, &iatt, &iatt, xdata);
+	return 0;
+}
+
+static struct meta_ops measure_file_ops = {
+	.file_fill = measure_file_fill,
+	.fops = {
+		.truncate = measure_truncate,
+		.ftruncate = measure_ftruncate,
+		.writev = measure_writev
+	}
+};
+
+
+int
+meta_measure_file_hook (call_frame_t *frame, xlator_t *this, loc_t *loc,
+			dict_t *xdata)
+{
+	meta_ops_set (loc->inode, this, &measure_file_ops);
+
+	return 0;
+}