btrfs: replace fs_info and private_data with inode in btrfs_wq_submit_bio

All callers of btrfs_wq_submit_bio() pass struct inode as @private_data,
so there is no need for it to be (void *), replace it with "struct inode
*inode".

While we can extract fs_info from struct inode, also remove the @fs_info
parameter.

Since we're here, also replace all the (void *private_data) into (struct
inode *inode).
Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -109,7 +109,7 @@ static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
  * just before they are sent down the IO stack.
  */
 struct async_submit_bio {
-	void *private_data;
+	struct inode *inode;
 	struct bio *bio;
 	extent_submit_bio_start_t *submit_bio_start;
 	int mirror_num;
@@ -696,8 +696,7 @@ static void run_one_async_start(struct btrfs_work *work)
 	blk_status_t ret;
 
 	async = container_of(work, struct  async_submit_bio, work);
-	ret = async->submit_bio_start(async->private_data, async->bio,
-				      async->bio_offset);
+	ret = async->submit_bio_start(async->inode, async->bio, async->bio_offset);
 	if (ret)
 		async->status = ret;
 }
@@ -717,7 +716,7 @@ static void run_one_async_done(struct btrfs_work *work)
 	blk_status_t ret;
 
 	async = container_of(work, struct  async_submit_bio, work);
-	inode = async->private_data;
+	inode = async->inode;
 
 	/* If an error occurred we just want to clean up the bio and move on */
 	if (async->status) {
@@ -747,18 +746,19 @@ static void run_one_async_free(struct btrfs_work *work)
 	kfree(async);
 }
 
-blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
+blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
 				 int mirror_num, unsigned long bio_flags,
-				 u64 bio_offset, void *private_data,
+				 u64 bio_offset,
 				 extent_submit_bio_start_t *submit_bio_start)
 {
+	struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
 	struct async_submit_bio *async;
 
 	async = kmalloc(sizeof(*async), GFP_NOFS);
 	if (!async)
 		return BLK_STS_RESOURCE;
 
-	async->private_data = private_data;
+	async->inode = inode;
 	async->bio = bio;
 	async->mirror_num = mirror_num;
 	async->submit_bio_start = submit_bio_start;
@@ -795,7 +795,7 @@ static blk_status_t btree_csum_one_bio(struct bio *bio)
 	return errno_to_blk_status(ret);
 }
 
-static blk_status_t btree_submit_bio_start(void *private_data, struct bio *bio,
+static blk_status_t btree_submit_bio_start(struct inode *inode, struct bio *bio,
 					   u64 bio_offset)
 {
 	/*
@@ -842,8 +842,8 @@ blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
 		 * kthread helpers are used to submit writes so that
 		 * checksumming can happen in parallel across all CPUs
 		 */
-		ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, 0,
-					  0, inode, btree_submit_bio_start);
+		ret = btrfs_wq_submit_bio(inode, bio, mirror_num, 0,
+					  0, btree_submit_bio_start);
 	}
 
 	if (ret)

fs/btrfs/disk-io.h

@@ -112,9 +112,9 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
 		      struct btrfs_key *first_key);
 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
 			enum btrfs_wq_endio_type metadata);
-blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
+blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
 				 int mirror_num, unsigned long bio_flags,
-			u64 bio_offset, void *private_data,
+				 u64 bio_offset,
 				 extent_submit_bio_start_t *submit_bio_start);
 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
 			  int mirror_num);

fs/btrfs/extent_io.h

@@ -71,7 +71,7 @@ typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
 					 int mirror_num,
 					 unsigned long bio_flags);
 
-typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
+typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
 		struct bio *bio, u64 bio_offset);
 
 #define INLINE_EXTENT_BUFFER_PAGES 16

fs/btrfs/inode.c

@@ -2194,11 +2194,9 @@ int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
  * At IO completion time the cums attached on the ordered extent record
  * are inserted into the btree
  */
-static blk_status_t btrfs_submit_bio_start(void *private_data, struct bio *bio,
+static blk_status_t btrfs_submit_bio_start(struct inode *inode, struct bio *bio,
 					   u64 bio_offset)
 {
-	struct inode *inode = private_data;
-
 	return btrfs_csum_one_bio(BTRFS_I(inode), bio, 0, 0);
 }
 
@@ -2263,8 +2261,8 @@ blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
 		if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
 			goto mapit;
 		/* we're doing a write, do the async checksumming */
-		ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, bio_flags,
-					  0, inode, btrfs_submit_bio_start);
+		ret = btrfs_wq_submit_bio(inode, bio, mirror_num, bio_flags,
+					  0, btrfs_submit_bio_start);
 		goto out;
 	} else if (!skip_sum) {
 		ret = btrfs_csum_one_bio(BTRFS_I(inode), bio, 0, 0);
@@ -7747,11 +7745,9 @@ static void __endio_write_update_ordered(struct btrfs_inode *inode,
 	}
 }
 
-static blk_status_t btrfs_submit_bio_start_direct_io(void *private_data,
+static blk_status_t btrfs_submit_bio_start_direct_io(struct inode *inode,
 						     struct bio *bio, u64 offset)
 {
-	struct inode *inode = private_data;
-
 	return btrfs_csum_one_bio(BTRFS_I(inode), bio, offset, 1);
 }
 
@@ -7802,8 +7798,8 @@ static inline blk_status_t btrfs_submit_dio_bio(struct bio *bio,
 		goto map;
 
 	if (write && async_submit) {
-		ret = btrfs_wq_submit_bio(fs_info, bio, 0, 0,
-					  file_offset, inode,
+		ret = btrfs_wq_submit_bio(inode, bio, 0, 0,
+					  file_offset,
 					  btrfs_submit_bio_start_direct_io);
 		goto err;
 	} else if (write) {