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Commit 5089c1e8 authored by Mohan Srinivasan's avatar Mohan Srinivasan Committed by Amit Pundir
Browse files

ANDROID: fs: FS tracepoints to track IO. 



Adds tracepoints in ext4/f2fs/mpage to track readpages/buffered
write()s. This allows us to track files that are being read/written
to PIDs.

Change-Id: Ib3a73ed49a983e7de2a149adf4a971234e6161ef
Signed-off-by: default avatarMohan Srinivasan <srmohan@google.com>
parent 8cf50759

fs/ext4/inline.c

+6 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include "ext4.h"

#include "xattr.h"

#include "truncate.h"

#include <trace/events/android_fs.h>



#define EXT4_XATTR_SYSTEM_DATA	"data"

#define EXT4_MIN_INLINE_DATA_SIZE	((sizeof(__le32) * EXT4_N_BLOCKS))
@@ -501,6 +502,9 @@ int ext4_readpage_inline(struct inode *inode, struct page *page) 
		return -EAGAIN;

	}



	trace_android_fs_dataread_start(inode, page_offset(page), PAGE_SIZE,

					current->pid, current->comm);



	/*

	 * Current inline data can only exist in the 1st page,

	 * So for all the other pages, just set them uptodate.
@@ -512,6 +516,8 @@ int ext4_readpage_inline(struct inode *inode, struct page *page) 
		SetPageUptodate(page);

	}



	trace_android_fs_dataread_end(inode, page_offset(page), PAGE_SIZE);



	up_read(&EXT4_I(inode)->xattr_sem);



	unlock_page(page);

fs/ext4/inode.c

+23 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ 
#include "truncate.h"



#include <trace/events/ext4.h>

#include <trace/events/android_fs.h>



#define MPAGE_DA_EXTENT_TAIL 0x01
@@ -980,6 +981,8 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping, 
	pgoff_t index;

	unsigned from, to;



	trace_android_fs_datawrite_start(inode, pos, len,

					 current->pid, current->comm);

	trace_ext4_write_begin(inode, pos, len, flags);

	/*

	 * Reserve one block more for addition to orphan list in case
@@ -1115,6 +1118,7 @@ static int ext4_write_end(struct file *file, 
	int ret = 0, ret2;

	int i_size_changed = 0;



	trace_android_fs_datawrite_end(inode, pos, len);

	trace_ext4_write_end(inode, pos, len, copied);

	if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE)) {

		ret = ext4_jbd2_file_inode(handle, inode);
@@ -1188,6 +1192,7 @@ static int ext4_journalled_write_end(struct file *file, 
	unsigned from, to;

	int size_changed = 0;



	trace_android_fs_datawrite_end(inode, pos, len);

	trace_ext4_journalled_write_end(inode, pos, len, copied);

	from = pos & (PAGE_CACHE_SIZE - 1);

	to = from + len;
@@ -2682,6 +2687,8 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping, 
					len, flags, pagep, fsdata);

	}

	*fsdata = (void *)0;

	trace_android_fs_datawrite_start(inode, pos, len,

					 current->pid, current->comm);

	trace_ext4_da_write_begin(inode, pos, len, flags);



	if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
@@ -2800,6 +2807,7 @@ static int ext4_da_write_end(struct file *file, 
		return ext4_write_end(file, mapping, pos,

				      len, copied, page, fsdata);



	trace_android_fs_datawrite_end(inode, pos, len);

	trace_ext4_da_write_end(inode, pos, len, copied);

	start = pos & (PAGE_CACHE_SIZE - 1);

	end = start + copied - 1;
@@ -3276,12 +3284,27 @@ static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb, 
	if (ext4_has_inline_data(inode))

		return 0;



	if (trace_android_fs_dataread_start_enabled() && (rw == READ))

		trace_android_fs_dataread_start(inode, offset, count,

						current->pid,

						current->comm);

	if (trace_android_fs_datawrite_start_enabled() && (rw == WRITE))

		trace_android_fs_datawrite_start(inode, offset, count,

						 current->pid,

						 current->comm);



	trace_ext4_direct_IO_enter(inode, offset, count, rw);

	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))

		ret = ext4_ext_direct_IO(rw, iocb, iter, offset);

	else

		ret = ext4_ind_direct_IO(rw, iocb, iter, offset);

	trace_ext4_direct_IO_exit(inode, offset, count, rw, ret);



	if (trace_android_fs_dataread_start_enabled() && (rw == READ))

		trace_android_fs_dataread_end(inode, offset, count);

	if (trace_android_fs_datawrite_start_enabled() && (rw == WRITE))

		trace_android_fs_datawrite_end(inode, offset, count);



	return ret;

}

fs/ext4/readpage.c

+37 −4
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <linux/cleancache.h>



#include "ext4.h"

#include <trace/events/android_fs.h>



/*

 * Call ext4_decrypt on every single page, reusing the encryption
@@ -86,6 +87,17 @@ static inline bool ext4_bio_encrypted(struct bio *bio) 
#endif

}



static void

ext4_trace_read_completion(struct bio *bio, int err)

{

	struct page *first_page = bio->bi_io_vec[0].bv_page;



	if (first_page != NULL)

		trace_android_fs_dataread_end(first_page->mapping->host,

					      page_offset(first_page),

					      bio->bi_iter.bi_size);

}



/*

 * I/O completion handler for multipage BIOs.

 *
@@ -103,6 +115,9 @@ static void mpage_end_io(struct bio *bio, int err) 
	struct bio_vec *bv;

	int i;



	if (trace_android_fs_dataread_start_enabled())

		ext4_trace_read_completion(bio, err);



	if (ext4_bio_encrypted(bio)) {

		struct ext4_crypto_ctx *ctx = bio->bi_private;
@@ -130,6 +145,24 @@ static void mpage_end_io(struct bio *bio, int err) 
	bio_put(bio);

}



static void

ext4_submit_bio_read(struct bio *bio)

{

	if (trace_android_fs_dataread_start_enabled()) {

		struct page *first_page = bio->bi_io_vec[0].bv_page;



		if (first_page != NULL) {

			trace_android_fs_dataread_start(

				first_page->mapping->host,

				page_offset(first_page),

				bio->bi_iter.bi_size,

				current->pid,

				current->comm);

		}

	}

	submit_bio(READ, bio);

}



int ext4_mpage_readpages(struct address_space *mapping,

			 struct list_head *pages, struct page *page,

			 unsigned nr_pages)
@@ -271,7 +304,7 @@ int ext4_mpage_readpages(struct address_space *mapping, 
		 */

		if (bio && (last_block_in_bio != blocks[0] - 1)) {

		submit_and_realloc:

			submit_bio(READ, bio);

			ext4_submit_bio_read(bio);

			bio = NULL;

		}

		if (bio == NULL) {
@@ -303,14 +336,14 @@ int ext4_mpage_readpages(struct address_space *mapping, 
		if (((map.m_flags & EXT4_MAP_BOUNDARY) &&

		     (relative_block == map.m_len)) ||

		    (first_hole != blocks_per_page)) {

			submit_bio(READ, bio);

			ext4_submit_bio_read(bio);

			bio = NULL;

		} else

			last_block_in_bio = blocks[blocks_per_page - 1];

		goto next_page;

	confused:

		if (bio) {

			submit_bio(READ, bio);

			ext4_submit_bio_read(bio);

			bio = NULL;

		}

		if (!PageUptodate(page))
@@ -323,6 +356,6 @@ int ext4_mpage_readpages(struct address_space *mapping, 
	}

	BUG_ON(pages && !list_empty(pages));

	if (bio)

		submit_bio(READ, bio);

		ext4_submit_bio_read(bio);

	return 0;

}

fs/f2fs/data.c

+17 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include "node.h"

#include "segment.h"

#include <trace/events/f2fs.h>

#include <trace/events/android_fs.h>



static void f2fs_read_end_io(struct bio *bio, int err)

{
@@ -956,6 +957,8 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, 
	struct dnode_of_data dn;

	int err = 0;



	trace_android_fs_datawrite_start(inode, pos, len,

					 current->pid, current->comm);

	trace_f2fs_write_begin(inode, pos, len, flags);



	f2fs_balance_fs(sbi);
@@ -1048,6 +1051,7 @@ static int f2fs_write_end(struct file *file, 
{

	struct inode *inode = page->mapping->host;



	trace_android_fs_datawrite_end(inode, pos, len);

	trace_f2fs_write_end(inode, pos, len, copied);



	if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
@@ -1098,6 +1102,14 @@ static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, 
	if (check_direct_IO(inode, rw, iter, offset))

		return 0;



	if (trace_android_fs_dataread_start_enabled() && (rw == READ))

		trace_android_fs_dataread_start(inode, offset,

						count, current->pid,

						current->comm);

	if (trace_android_fs_datawrite_start_enabled() && (rw == WRITE))

		trace_android_fs_datawrite_start(inode, offset, count,

						 current->pid, current->comm);



	trace_f2fs_direct_IO_enter(inode, offset, count, rw);



	err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block);
@@ -1106,6 +1118,11 @@ static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, 


	trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);



	if (trace_android_fs_dataread_start_enabled() && (rw == READ))

		trace_android_fs_dataread_end(inode, offset, count);

	if (trace_android_fs_datawrite_start_enabled() && (rw == WRITE))

		trace_android_fs_datawrite_end(inode, offset, count);



	return err;

}

fs/f2fs/inline.c

+8 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/f2fs_fs.h>



#include "f2fs.h"

#include <trace/events/android_fs.h>



bool f2fs_may_inline(struct inode *inode)

{
@@ -40,6 +41,10 @@ int f2fs_read_inline_data(struct inode *inode, struct page *page) 
	struct page *ipage;

	void *src_addr, *dst_addr;



	trace_android_fs_dataread_start(inode, page_offset(page),

					PAGE_SIZE, current->pid,

					current->comm);



	if (page->index) {

		zero_user_segment(page, 0, PAGE_CACHE_SIZE);

		goto out;
@@ -47,6 +52,8 @@ int f2fs_read_inline_data(struct inode *inode, struct page *page) 


	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);

	if (IS_ERR(ipage)) {

		trace_android_fs_dataread_end(inode, page_offset(page),

					      PAGE_SIZE);

		unlock_page(page);

		return PTR_ERR(ipage);

	}
@@ -61,6 +68,7 @@ int f2fs_read_inline_data(struct inode *inode, struct page *page) 
	f2fs_put_page(ipage, 1);



out:

	trace_android_fs_dataread_end(inode, page_offset(page), PAGE_SIZE);

	SetPageUptodate(page);

	unlock_page(page);