[PATCH 06/42] direct-io: set bi_op to REQ_OP

[mchristi@redhat.com]

From: Mike Christie <mchristi@redhat.com>

This patch has the dio code set the bio bi_op to a REQ_OP and bio op_flags
to rq_flag_bits.

It also begins to convert btrfs's dio_submit_t because of the dio submit_io
callout use. In the btrfs_submit_direct change, I OR'd the op and flag back
together. It is only temporary. The next patched will completely convert
all the btrfs code paths.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
---
 fs/btrfs/inode.c   |  9 +++++----
 fs/direct-io.c     | 35 +++++++++++++++++++++--------------
 include/linux/fs.h |  2 +-
 3 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 9cc2256..d999fdf 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8401,14 +8401,14 @@ out_err:
 	return 0;
 }
 
-static void btrfs_submit_direct(int rw, struct bio *dio_bio,
-				struct inode *inode, loff_t file_offset)
+static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
+				loff_t file_offset)
 {
 	struct btrfs_dio_private *dip = NULL;
 	struct bio *io_bio = NULL;
 	struct btrfs_io_bio *btrfs_bio;
 	int skip_sum;
-	int write = rw & REQ_WRITE;
+	bool write = (dio_bio->bi_op == REQ_OP_WRITE);
 	int ret = 0;
 
 	skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
@@ -8459,7 +8459,8 @@ static void btrfs_submit_direct(int rw, struct bio *dio_bio,
 			dio_data->unsubmitted_oe_range_end;
 	}
 
-	ret = btrfs_submit_direct_hook(rw, dip, skip_sum);
+	ret = btrfs_submit_direct_hook(dio_bio->bi_op | dio_bio->bi_rw, dip,
+				       skip_sum);
 	if (!ret)
 		return;
 
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 1890ad2..64bfab0 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -108,7 +108,8 @@ struct dio_submit {
 /* dio_state communicated between submission path and end_io */
 struct dio {
 	int flags;			/* doesn't change */
-	int rw;
+	int op;
+	int op_flags;
 	blk_qc_t bio_cookie;
 	struct block_device *bio_bdev;
 	struct inode *inode;
@@ -163,7 +164,7 @@ static inline int dio_refill_pages(struct dio *dio, struct dio_submit *sdio)
 	ret = iov_iter_get_pages(sdio->iter, dio->pages, LONG_MAX, DIO_PAGES,
 				&sdio->from);
 
-	if (ret < 0 && sdio->blocks_available && (dio->rw & WRITE)) {
+	if (ret < 0 && sdio->blocks_available && (dio->op == REQ_OP_WRITE)) {
 		struct page *page = ZERO_PAGE(0);
 		/*
 		 * A memory fault, but the filesystem has some outstanding
@@ -242,7 +243,8 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
 		transferred = dio->result;
 
 		/* Check for short read case */
-		if ((dio->rw == READ) && ((offset + transferred) > dio->i_size))
+		if ((dio->op == REQ_OP_READ) &&
+		    ((offset + transferred) > dio->i_size))
 			transferred = dio->i_size - offset;
 	}
 
@@ -265,7 +267,7 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
 		inode_dio_end(dio->inode);
 
 	if (is_async) {
-		if (dio->rw & WRITE) {
+		if (dio->op == REQ_OP_WRITE) {
 			int err;
 
 			err = generic_write_sync(dio->iocb->ki_filp, offset,
@@ -374,7 +376,8 @@ dio_bio_alloc(struct dio *dio, struct dio_submit *sdio,
 
 	bio->bi_bdev = bdev;
 	bio->bi_iter.bi_sector = first_sector;
-	bio->bi_rw = dio->rw;
+	bio->bi_op = dio->op;
+	bio->bi_rw = dio->op_flags;
 	if (dio->is_async)
 		bio->bi_end_io = dio_bio_end_aio;
 	else
@@ -402,14 +405,13 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
 	dio->refcount++;
 	spin_unlock_irqrestore(&dio->bio_lock, flags);
 
-	if (dio->is_async && dio->rw == READ && dio->should_dirty)
+	if (dio->is_async && dio->op == REQ_OP_READ && dio->should_dirty)
 		bio_set_pages_dirty(bio);
 
 	dio->bio_bdev = bio->bi_bdev;
 
 	if (sdio->submit_io) {
-		sdio->submit_io(dio->rw, bio, dio->inode,
-			       sdio->logical_offset_in_bio);
+		sdio->submit_io(bio, dio->inode, sdio->logical_offset_in_bio);
 		dio->bio_cookie = BLK_QC_T_NONE;
 	} else
 		dio->bio_cookie = submit_bio(bio);
@@ -478,14 +480,14 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
 	if (bio->bi_error)
 		dio->io_error = -EIO;
 
-	if (dio->is_async && dio->rw == READ && dio->should_dirty) {
+	if (dio->is_async && dio->op == REQ_OP_READ && dio->should_dirty) {
 		err = bio->bi_error;
 		bio_check_pages_dirty(bio);	/* transfers ownership */
 	} else {
 		bio_for_each_segment_all(bvec, bio, i) {
 			struct page *page = bvec->bv_page;
 
-			if (dio->rw == READ && !PageCompound(page) &&
+			if (dio->op == REQ_OP_READ && !PageCompound(page) &&
 					dio->should_dirty)
 				set_page_dirty_lock(page);
 			put_page(page);
@@ -638,7 +640,7 @@ static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
 		 * which may decide to handle it or also return an unmapped
 		 * buffer head.
 		 */
-		create = dio->rw & WRITE;
+		create = dio->op == REQ_OP_WRITE;
 		if (dio->flags & DIO_SKIP_HOLES) {
 			if (sdio->block_in_file < (i_size_read(dio->inode) >>
 							sdio->blkbits))
@@ -788,7 +790,7 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page,
 {
 	int ret = 0;
 
-	if (dio->rw & WRITE) {
+	if (dio->op == REQ_OP_WRITE) {
 		/*
 		 * Read accounting is performed in submit_bio()
 		 */
@@ -988,7 +990,7 @@ do_holes:
 				loff_t i_size_aligned;
 
 				/* AKPM: eargh, -ENOTBLK is a hack */
-				if (dio->rw & WRITE) {
+				if (dio->op == REQ_OP_WRITE) {
 					put_page(page);
 					return -ENOTBLK;
 				}
@@ -1201,7 +1203,12 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 		dio->is_async = true;
 
 	dio->inode = inode;
-	dio->rw = iov_iter_rw(iter) == WRITE ? WRITE_ODIRECT : READ;
+	if (iov_iter_rw(iter) == WRITE) {
+		dio->op = REQ_OP_WRITE;
+		dio->op_flags = WRITE_ODIRECT;
+	} else {
+		dio->op = REQ_OP_READ;
+	}
 
 	/*
 	 * For AIO O_(D)SYNC writes we need to defer completions to a workqueue
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 96ace0f..f3f2f66 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2792,7 +2792,7 @@ extern int generic_file_open(struct inode * inode, struct file * filp);
 extern int nonseekable_open(struct inode * inode, struct file * filp);
 
 #ifdef CONFIG_BLOCK
-typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
+typedef void (dio_submit_t)(struct bio *bio, struct inode *inode,
 			    loff_t file_offset);
 
 enum {
-- 
2.7.2