[PATCH 2/8] writeback: add wbc_to_write_flags()

[Jens Axboe]

Add wbc_to_write_flags(), which returns the write modifier flags to use,
based on a struct writeback_control. No functional changes in this
patch, but it prepares us for factoring other wbc fields for write type.

Signed-off-by: Jens Axboe <axboe@xxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
---
 fs/buffer.c               | 2 +-
 fs/f2fs/data.c            | 2 +-
 fs/f2fs/node.c            | 2 +-
 fs/gfs2/meta_io.c         | 3 +--
 fs/mpage.c                | 2 +-
 fs/xfs/xfs_aops.c         | 7 +++----
 include/linux/writeback.h | 8 ++++++++
 7 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index b205a629001d..abb13b0801f9 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1697,7 +1697,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
 	struct buffer_head *bh, *head;
 	unsigned int blocksize, bbits;
 	int nr_underway = 0;
-	int write_flags = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0);
+	int write_flags = wbc_to_write_flags(wbc);
 
 	head = create_page_buffers(page, inode,
 					(1 << BH_Dirty)|(1 << BH_Uptodate));
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9ae194fd2fdb..f86df4f19a64 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1251,7 +1251,7 @@ static int f2fs_write_data_page(struct page *page,
 		.sbi = sbi,
 		.type = DATA,
 		.op = REQ_OP_WRITE,
-		.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0,
+		.op_flags = wbc_to_write_flags(wbc),
 		.page = page,
 		.encrypted_page = NULL,
 	};
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 01177ecdeab8..772a123f84d9 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1570,7 +1570,7 @@ static int f2fs_write_node_page(struct page *page,
 		.sbi = sbi,
 		.type = NODE,
 		.op = REQ_OP_WRITE,
-		.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0,
+		.op_flags = wbc_to_write_flags(wbc),
 		.page = page,
 		.encrypted_page = NULL,
 	};
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 373639a59782..3223ccf6e7c7 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -37,8 +37,7 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
 {
 	struct buffer_head *bh, *head;
 	int nr_underway = 0;
-	int write_flags = REQ_META | REQ_PRIO |
-		(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0);
+	int write_flags = REQ_META | REQ_PRIO | wbc_to_write_flags(wbc);
 
 	BUG_ON(!PageLocked(page));
 	BUG_ON(!page_has_buffers(page));
diff --git a/fs/mpage.c b/fs/mpage.c
index d2413af0823a..d6f1afe3397a 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -489,7 +489,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
 	struct buffer_head map_bh;
 	loff_t i_size = i_size_read(inode);
 	int ret = 0;
-	int op_flags = (wbc->sync_mode == WB_SYNC_ALL ?  WRITE_SYNC : 0);
+	int op_flags = wbc_to_write_flags(wbc);
 
 	if (page_has_buffers(page)) {
 		struct buffer_head *head = page_buffers(page);
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 3e57a56cf829..59e836805766 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -495,8 +495,8 @@ xfs_submit_ioend(
 
 	ioend->io_bio->bi_private = ioend;
 	ioend->io_bio->bi_end_io = xfs_end_bio;
-	bio_set_op_attrs(ioend->io_bio, REQ_OP_WRITE,
-			 (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0);
+	bio_set_op_attrs(ioend->io_bio, REQ_OP_WRITE, wbc_to_write_flags(wbc));
+
 	/*
 	 * If we are failing the IO now, just mark the ioend with an
 	 * error and finish it. This will run IO completion immediately
@@ -567,8 +567,7 @@ xfs_chain_bio(
 
 	bio_chain(ioend->io_bio, new);
 	bio_get(ioend->io_bio);		/* for xfs_destroy_ioend */
-	bio_set_op_attrs(ioend->io_bio, REQ_OP_WRITE,
-			  (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0);
+	bio_set_op_attrs(ioend->io_bio, REQ_OP_WRITE, wbc_to_write_flags(wbc));
 	submit_bio(ioend->io_bio);
 	ioend->io_bio = new;
 }
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 797100e10010..78b87c517b5f 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -100,6 +100,14 @@ struct writeback_control {
 #endif
 };
 
+static inline int wbc_to_write_flags(struct writeback_control *wbc)
+{
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		return WRITE_SYNC;
+
+	return 0;
+}
+
 /*
  * A wb_domain represents a domain that wb's (bdi_writeback's) belong to
  * and are measured against each other in.  There always is one global
-- 
2.7.4