add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/mpage.c
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@@ -39,8 +39,6 @@
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 EXPORT_TRACEPOINT_SYMBOL(android_fs_datawrite_end);
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 EXPORT_TRACEPOINT_SYMBOL(android_fs_dataread_start);
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 EXPORT_TRACEPOINT_SYMBOL(android_fs_dataread_end);
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-EXPORT_TRACEPOINT_SYMBOL(android_fs_fsync_start);
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-EXPORT_TRACEPOINT_SYMBOL(android_fs_fsync_end);
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 /*
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  * I/O completion handler for multipage BIOs.
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@@ -57,7 +55,7 @@
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 static void mpage_end_io(struct bio *bio)
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 {
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 	struct bio_vec *bv;
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-	int i;
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+	struct bvec_iter_all iter_all;
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 	if (trace_android_fs_dataread_end_enabled() &&
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 	    (bio_data_dir(bio) == READ)) {
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@@ -69,7 +67,7 @@
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 						      bio->bi_iter.bi_size);
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 	}
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-	bio_for_each_segment_all(bv, bio, i) {
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+	bio_for_each_segment_all(bv, bio, iter_all) {
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 		struct page *page = bv->bv_page;
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 		page_endio(page, bio_op(bio),
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 			   blk_status_to_errno(bio->bi_status));
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@@ -100,7 +98,7 @@
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 	}
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 	bio->bi_end_io = mpage_end_io;
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 	bio_set_op_attrs(bio, op, op_flags);
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-	guard_bio_eod(op, bio);
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+	guard_bio_eod(bio);
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 	submit_bio(bio);
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 	return NULL;
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 }
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@@ -129,7 +127,7 @@
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 }
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 /*
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- * support function for mpage_readpages.  The fs supplied get_block might
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+ * support function for mpage_readahead.  The fs supplied get_block might
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  * return an up to date buffer.  This is used to map that buffer into
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  * the page, which allows readpage to avoid triggering a duplicate call
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  * to get_block.
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@@ -376,13 +374,8 @@
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 }
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 /**
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- * mpage_readpages - populate an address space with some pages & start reads against them
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- * @mapping: the address_space
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- * @pages: The address of a list_head which contains the target pages.  These
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- *   pages have their ->index populated and are otherwise uninitialised.
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- *   The page at @pages->prev has the lowest file offset, and reads should be
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- *   issued in @pages->prev to @pages->next order.
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- * @nr_pages: The number of pages at *@pages
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+ * mpage_readahead - start reads against pages
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+ * @rac: Describes which pages to read.
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  * @get_block: The filesystem's block mapper function.
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  *
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  * This function walks the pages and the blocks within each page, building and
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@@ -419,36 +412,25 @@
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  *
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  * This all causes the disk requests to be issued in the correct order.
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  */
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-int
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-mpage_readpages(struct address_space *mapping, struct list_head *pages,
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-				unsigned nr_pages, get_block_t get_block)
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+void mpage_readahead(struct readahead_control *rac, get_block_t get_block)
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 {
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+	struct page *page;
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 	struct mpage_readpage_args args = {
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 		.get_block = get_block,
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 		.is_readahead = true,
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 	};
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-	unsigned page_idx;
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-	for (page_idx = 0; page_idx < nr_pages; page_idx++) {
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-		struct page *page = lru_to_page(pages);
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-
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+	while ((page = readahead_page(rac))) {
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 		prefetchw(&page->flags);
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-		list_del(&page->lru);
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-		if (!add_to_page_cache_lru(page, mapping,
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-					page->index,
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-					readahead_gfp_mask(mapping))) {
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-			args.page = page;
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-			args.nr_pages = nr_pages - page_idx;
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-			args.bio = do_mpage_readpage(&args);
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-		}
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+		args.page = page;
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+		args.nr_pages = readahead_count(rac);
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+		args.bio = do_mpage_readpage(&args);
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 		put_page(page);
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 	}
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-	BUG_ON(!list_empty(pages));
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 	if (args.bio)
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 		mpage_bio_submit(REQ_OP_READ, REQ_RAHEAD, args.bio);
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-	return 0;
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 }
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-EXPORT_SYMBOL(mpage_readpages);
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+EXPORT_SYMBOL_NS(mpage_readahead, ANDROID_GKI_VFS_EXPORT_ONLY);
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 /*
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  * This isn't called much at all
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@@ -466,7 +448,7 @@
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 		mpage_bio_submit(REQ_OP_READ, 0, args.bio);
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 	return 0;
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 }
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-EXPORT_SYMBOL(mpage_readpage);
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+EXPORT_SYMBOL_NS(mpage_readpage, ANDROID_GKI_VFS_EXPORT_ONLY);
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 /*
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  * Writing is not so simple.
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@@ -601,7 +583,7 @@
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 		 * Page has buffers, but they are all unmapped. The page was
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 		 * created by pagein or read over a hole which was handled by
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 		 * block_read_full_page().  If this address_space is also
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-		 * using mpage_readpages then this can rarely happen.
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+		 * using mpage_readahead then this can rarely happen.
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 		 */
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 		goto confused;
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 	}
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@@ -685,7 +667,7 @@
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 	 * the confused fail path above (OOM) will be very confused when
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 	 * it finds all bh marked clean (i.e. it will not write anything)
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 	 */
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-	wbc_account_io(wbc, page, PAGE_SIZE);
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+	wbc_account_cgroup_owner(wbc, page, PAGE_SIZE);
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 	length = first_unmapped << blkbits;
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 	if (bio_add_page(bio, page, length, 0) < length) {
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 		bio = mpage_bio_submit(REQ_OP_WRITE, op_flags, bio);