gfapi: create statedump when glusterd requests it

When GlusterD sends the STATEDUMP procedure to the libgfapi client, the
client checks if it matches the PID that should take the statedump. If
so, it will do a statedump for the glfs_t that is connected to this mgmt
connection.

> BUG: 1169302
> See-also: http://review.gluster.org/9228
> Signed-off-by: Poornima G <pgurusid@redhat.com>
> [ndevos: separated patch from 9228]
> Reviewed-on: https://review.gluster.org/16415
> Reviewed-by: Niels de Vos <ndevos@redhat.com>
> Tested-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
> Reviewed-by: Prashanth Pai <ppai@redhat.com>

BUG: 1418981
Change-Id: I70d6a1f4f19d525377aebc8fa57f51e513b92d84
Signed-off-by: Shyam <srangana@redhat.com>
Reviewed-on: https://review.gluster.org/16602
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/api/src/glfs-mgmt.c b/api/src/glfs-mgmt.c
index b03d9808679..045080d667a 100644
--- a/api/src/glfs-mgmt.c
+++ b/api/src/glfs-mgmt.c
@@ -29,6 +29,7 @@
 #include "portmap-xdr.h"
 #include "xdr-common.h"
 #include "xdr-generic.h"
+#include "rpc-common-xdr.h"
 
 #include "syncop.h"
 #include "xlator.h"
@@ -116,11 +117,71 @@ mgmt_cbk_event (struct rpc_clnt *rpc, void *mydata, void *data)
 	return 0;
 }
 
+static int
+mgmt_cbk_statedump (struct rpc_clnt *rpc, void *mydata, void *data)
+{
+        struct glfs      *fs          = NULL;
+        xlator_t         *this        = NULL;
+        gf_statedump      target_pid  = {0, };
+        struct iovec     *iov         = NULL;
+        int               ret         = -1;
+
+        this = mydata;
+        if (!this) {
+                gf_msg ("glfs", GF_LOG_ERROR, EINVAL,
+                        API_MSG_STATEDUMP_FAILED, "NULL mydata");
+                errno = EINVAL;
+                goto out;
+        }
+
+        fs = this->private;
+        if (!fs) {
+                gf_msg ("glfs", GF_LOG_ERROR, EINVAL,
+                        API_MSG_STATEDUMP_FAILED, "NULL glfs");
+                errno = EINVAL;
+                goto out;
+        }
+
+        iov = (struct iovec *)data;
+        if (!iov) {
+                gf_msg ("glfs", GF_LOG_ERROR, EINVAL,
+                        API_MSG_STATEDUMP_FAILED, "NULL iovec data");
+                errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &target_pid,
+                              (xdrproc_t)xdr_gf_statedump);
+        if (ret < 0) {
+                gf_msg ("glfs", GF_LOG_ERROR, EINVAL,
+                        API_MSG_STATEDUMP_FAILED,
+                        "Failed to decode xdr response for GF_CBK_STATEDUMP");
+                goto out;
+        }
+
+        gf_msg_trace ("glfs", 0, "statedump requested for pid: %d",
+                      target_pid.pid);
+
+        if ((uint64_t)getpid() == target_pid.pid) {
+                gf_msg_debug ("glfs", 0, "Taking statedump for pid: %d",
+                              target_pid.pid);
+
+                ret = glfs_sysrq (fs, GLFS_SYSRQ_STATEDUMP);
+                if (ret < 0) {
+                        gf_msg ("glfs", GF_LOG_INFO, 0,
+                                API_MSG_STATEDUMP_FAILED,
+                                "statedump failed");
+                }
+        }
+out:
+        return ret;
+}
 
 rpcclnt_cb_actor_t mgmt_cbk_actors[GF_CBK_MAXVALUE] = {
 	[GF_CBK_FETCHSPEC] = {"FETCHSPEC", GF_CBK_FETCHSPEC, mgmt_cbk_spec },
 	[GF_CBK_EVENT_NOTIFY] = {"EVENTNOTIFY", GF_CBK_EVENT_NOTIFY,
 				 mgmt_cbk_event},
+        [GF_CBK_STATEDUMP] = {"STATEDUMP", GF_CBK_STATEDUMP, mgmt_cbk_statedump},
 };