From 2c30c71bd653afcbed7f6754e8fe3d16e0e708a1 Mon Sep 17 00:00:00 2001
From: Kent Overstreet
Date: Thu, 7 Nov 2013 12:20:26 -0800
Subject: block: Convert various code to bio_for_each_segment()

With immutable biovecs we don't want code accessing bi_io_vec directly -
the uses this patch changes weren't incorrect since they all own the
bio, but it makes the code harder to audit for no good reason - also,
this will help with multipage bvecs later.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Cc: Joern Engel <joern@logfs.org>
Cc: Prasad Joshi <prasadjoshi.linux@gmail.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
---
 fs/f2fs/data.c    | 13 +++++--------
 fs/f2fs/segment.c | 12 +++++-------
 2 files changed, 10 insertions(+), 15 deletions(-)

(limited to 'fs/f2fs')

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index aa3438c571fa..a4949096cf4c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -351,23 +351,20 @@ repeat:
 
 static void read_end_io(struct bio *bio, int err)
 {
-	const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
-	struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
+	struct bio_vec *bvec;
+	int i;
 
-	do {
+	bio_for_each_segment_all(bvec, bio, i) {
 		struct page *page = bvec->bv_page;
 
-		if (--bvec >= bio->bi_io_vec)
-			prefetchw(&bvec->bv_page->flags);
-
-		if (uptodate) {
+		if (!err) {
 			SetPageUptodate(page);
 		} else {
 			ClearPageUptodate(page);
 			SetPageError(page);
 		}
 		unlock_page(page);
-	} while (bvec >= bio->bi_io_vec);
+	}
 	bio_put(bio);
 }
 
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index fa284d397199..a90c6bc0d129 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -575,16 +575,14 @@ static const struct segment_allocation default_salloc_ops = {
 
 static void f2fs_end_io_write(struct bio *bio, int err)
 {
-	const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
-	struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
 	struct bio_private *p = bio->bi_private;
+	struct bio_vec *bvec;
+	int i;
 
-	do {
+	bio_for_each_segment_all(bvec, bio, i) {
 		struct page *page = bvec->bv_page;
 
-		if (--bvec >= bio->bi_io_vec)
-			prefetchw(&bvec->bv_page->flags);
-		if (!uptodate) {
+		if (err) {
 			SetPageError(page);
 			if (page->mapping)
 				set_bit(AS_EIO, &page->mapping->flags);
@@ -593,7 +591,7 @@ static void f2fs_end_io_write(struct bio *bio, int err)
 		}
 		end_page_writeback(page);
 		dec_page_count(p->sbi, F2FS_WRITEBACK);
-	} while (bvec >= bio->bi_io_vec);
+	}
 
 	if (p->is_sync)
 		complete(p->wait);
-- 
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