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ANDROID: loop: Add vendor hook to update cmd

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According to the value of OEM-specific field of struct bio, we need
to update the value of "iocb->ki_flags" or "iocb->ki_ioprio", so that
we can distinguish different IO's in lower level drivers and take
different measures.

Bug: 265611433
Change-Id: Id8ea3c3d064967b7a79fe24c48bf58d92c5d6e41
Signed-off-by: lijiaming <lijiaming3@xiaomi.com>
This commit is contained in:
lijiaming
2023-01-16 15:30:06 +08:00
committed by Todd Kjos
parent b73474bacc
commit 8501db9cda
3 changed files with 26 additions and 0 deletions
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2
drivers/android/vendor_hooks.c
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@@ -108,6 +108,7 @@
#include <trace/hooks/bl_hib.h>
#include <trace/hooks/dm.h>
#include <trace/hooks/direct_io.h>
#include <trace/hooks/loop.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
* associated with them) to allow external modules to probe them.
@@ -415,6 +416,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_post_image_save);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_dm_update_clone_bio);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_ctl_dirty_rate);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_direct_io_update_bio);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_loop_prepare_cmd);
/*
* For type visibility
*/

3
drivers/block/loop.c
View File

@@ -84,6 +84,7 @@
#include "loop.h"
#include <linux/uaccess.h>
#include <trace/hooks/loop.h>
#define LOOP_IDLE_WORKER_TIMEOUT (60 * HZ)
@@ -607,6 +608,8 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
cmd->iocb.ki_flags = IOCB_DIRECT;
cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
trace_android_vh_loop_prepare_cmd(bio, &cmd->iocb);
if (rw == WRITE)
ret = call_write_iter(file, &cmd->iocb, &iter);
else

21
include/trace/hooks/loop.h Normal file
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@@ -0,0 +1,21 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM loop
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_LOOP__H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_LOOP_H
#include <trace/hooks/vendor_hooks.h>
struct bio;
struct kiocb;
DECLARE_HOOK(android_vh_loop_prepare_cmd,
TP_PROTO(struct bio *bio, struct kiocb *iocb),
TP_ARGS(bio, iocb));
#endif /* _TRACE_HOOK_LOOP_H */
/* This part must be outside protection */
#include <trace/define_trace.h>