ANDROID: vendor hooks: add vendor hooks for do_new_mount

Add a vendor hook for do_new_mount_fc is aimed at categorizing the
properties according to the path. And making these properties more
easily accessible.This will help us to customize readahead operations, improving the speed of App startup and game loading.

Bug: 345590666
Bug: 411057773

Change-Id: I913bbb9bd4c3efd5f4c7d101056d301855881cc2
Signed-off-by: Wang Jianzheng <11134417@vivo.corp-partner.google.com>
(cherry picked from commit cdb09f7ea3366d2d6e4431f1329b26bd8317beb5)
Signed-off-by: ying zuxin <11154159@vivo.com>

drivers/android/vendor_hooks.c

@@ -487,6 +487,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_throttle_direct_reclaim_bypass);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_update_uid_stats);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_append_total_power);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_bd_link_disk_holder);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_new_mount_fc);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_new_ref);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_del_ref);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_fsnotify_open);

fs/namespace.c

@@ -36,6 +36,7 @@
 
 #include "pnode.h"
 #include "internal.h"
+#include <trace/hooks/blk.h>
 
 /* Maximum number of mounts in a mount namespace */
 static unsigned int sysctl_mount_max __read_mostly = 100000;
@@ -3454,6 +3455,8 @@ static int do_new_mount_fc(struct fs_context *fc, struct path *mountpoint,
 	unlock_mount(mp);
 	if (error < 0)
 		mntput(mnt);
+	else
+		trace_android_vh_do_new_mount_fc(mountpoint, mnt);
 	return error;
 }
 

include/trace/hooks/blk.h

@@ -17,6 +17,13 @@ DECLARE_HOOK(android_vh_bd_link_disk_holder,
 	TP_PROTO(struct block_device *bdev, struct gendisk *disk),
 	TP_ARGS(bdev, disk));
 
+struct path;
+struct vfsmount;
+
+DECLARE_HOOK(android_vh_do_new_mount_fc,
+	TP_PROTO(struct path *mountpoint, struct vfsmount *mnt),
+	TP_ARGS(mountpoint, mnt));
+
 struct blk_mq_hw_ctx;
 struct request_queue;