Statedump event for block devices

[lttng-modules.git] / lttng-statedump-impl.c

diff --git a/lttng-statedump-impl.c b/lttng-statedump-impl.c
index 3e46ca165fd8d71da80dc49b9aa8ff35f5d42c45..e9fe829f17bad251a4a985997c011c7acdd2f191 100644 (file)
--- a/lttng-statedump-impl.c
+++ b/lttng-statedump-impl.c
@@ -45,6 +45,7 @@
 #include <linux/swap.h>
 #include <linux/wait.h>
 #include <linux/mutex.h>
+#include <linux/device.h>
 
 #include "lttng-events.h"
 #include "lttng-tracer.h"
@@ -54,6 +55,7 @@
 #include "wrapper/nsproxy.h"
 #include "wrapper/irq.h"
 #include "wrapper/tracepoint.h"
+#include "wrapper/genhd.h"
 
 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
 #include <linux/irq.h>
@@ -65,6 +67,7 @@
 #define TRACE_INCLUDE_FILE lttng-statedump
 #include "instrumentation/events/lttng-module/lttng-statedump.h"
 
+DEFINE_TRACE(lttng_statedump_block_device);
 DEFINE_TRACE(lttng_statedump_end);
 DEFINE_TRACE(lttng_statedump_interrupt);
 DEFINE_TRACE(lttng_statedump_file_descriptor);
@@ -115,7 +118,49 @@ enum lttng_process_status {
        LTTNG_DEAD = 7,
 };
 
+static
+int lttng_enumerate_block_devices(struct lttng_session *session)
+{
+       struct class *ptr_block_class;
+       struct device_type *ptr_disk_type;
+       struct class_dev_iter iter;
+       struct device *dev;
+
+       ptr_block_class = wrapper_get_block_class();
+       if (!ptr_block_class)
+               return -ENOSYS;
+       ptr_disk_type = wrapper_get_disk_type();
+       if (!ptr_disk_type) {
+               return -ENOSYS;
+       }
+       class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
+       while ((dev = class_dev_iter_next(&iter))) {
+               struct disk_part_iter piter;
+               struct gendisk *disk = dev_to_disk(dev);
+               struct hd_struct *part;
+
+               disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
+               while ((part = disk_part_iter_next(&piter))) {
+                       char name_buf[BDEVNAME_SIZE];
+                       char *p;
+
+                       p = wrapper_disk_name(disk, part->partno, name_buf);
+                       if (!p) {
+                               disk_part_iter_exit(&piter);
+                               class_dev_iter_exit(&iter);
+                               return -ENOSYS;
+                       }
+                       trace_lttng_statedump_block_device(session,
+                                       part_devt(part), name_buf);
+               }
+               disk_part_iter_exit(&piter);
+       }
+       class_dev_iter_exit(&iter);
+       return 0;
+}
+
 #ifdef CONFIG_INET
+
 static
 void lttng_enumerate_device(struct lttng_session *session,
                struct net_device *dev)
@@ -397,6 +442,7 @@ int do_lttng_statedump(struct lttng_session *session)
        /* FIXME lttng_enumerate_vm_maps(session); */
        lttng_list_interrupts(session);
        lttng_enumerate_network_ip_interface(session);
+       lttng_enumerate_block_devices(session);
 
        /* TODO lttng_dump_idt_table(session); */
        /* TODO lttng_dump_softirq_vec(session); */