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From:   Tejun Heo <tj@kernel.org>
To:     axboe@kernel.dk
Cc:     jack@suse.cz, josef@toxicpanda.com, clm@fb.com, dsterba@suse.com,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-btrfs@vger.kernel.org, kernel-team@fb.com,
        Tejun Heo <tj@kernel.org>
Subject: [PATCH 2/5] blkcg, writeback: Rename wbc_account_io() to wbc_account_cgroup_owner()
Date:   Thu, 27 Jun 2019 13:39:49 -0700
Message-Id: <20190627203952.386785-3-tj@kernel.org>
In-Reply-To: <20190627203952.386785-1-tj@kernel.org>
References: <20190627203952.386785-1-tj@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

wbc_account_io() does a very specific job - try to see which cgroup is
actually dirtying an inode and transfer its ownership to the majority
dirtier if needed.  The name is too generic and confusing.  Let's
rename it to something more specific.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jan Kara <jack@suse.cz>
---
 Documentation/admin-guide/cgroup-v2.rst | 2 +-
 fs/btrfs/extent_io.c                    | 4 ++--
 fs/buffer.c                             | 2 +-
 fs/ext4/page-io.c                       | 2 +-
 fs/f2fs/data.c                          | 4 ++--
 fs/fs-writeback.c                       | 8 ++++----
 fs/mpage.c                              | 2 +-
 include/linux/writeback.h               | 8 ++++----
 8 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index cf88c1f98270..356a7a3dcb2f 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -2108,7 +2108,7 @@ following two functions.
 	a queue (device) has been associated with the bio and
 	before submission.
 
-  wbc_account_io(@wbc, @page, @bytes)
+  wbc_account_cgroup_owner(@wbc, @page, @bytes)
 	Should be called for each data segment being written out.
 	While this function doesn't care exactly when it's called
 	during the writeback session, it's the easiest and most
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index db337e53aab3..5106008f5e28 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2911,7 +2911,7 @@ static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree,
 			bio = NULL;
 		} else {
 			if (wbc)
-				wbc_account_io(wbc, page, page_size);
+				wbc_account_cgroup_owner(wbc, page, page_size);
 			return 0;
 		}
 	}
@@ -2924,7 +2924,7 @@ static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree,
 	bio->bi_opf = opf;
 	if (wbc) {
 		wbc_init_bio(wbc, bio);
-		wbc_account_io(wbc, page, page_size);
+		wbc_account_cgroup_owner(wbc, page, page_size);
 	}
 
 	*bio_ret = bio;
diff --git a/fs/buffer.c b/fs/buffer.c
index e450c55f6434..40547bbbea94 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3093,7 +3093,7 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
 
 	if (wbc) {
 		wbc_init_bio(wbc, bio);
-		wbc_account_io(wbc, bh->b_page, bh->b_size);
+		wbc_account_cgroup_owner(wbc, bh->b_page, bh->b_size);
 	}
 
 	submit_bio(bio);
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 4690618a92e9..56e287f5ee50 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -404,7 +404,7 @@ static int io_submit_add_bh(struct ext4_io_submit *io,
 	ret = bio_add_page(io->io_bio, page, bh->b_size, bh_offset(bh));
 	if (ret != bh->b_size)
 		goto submit_and_retry;
-	wbc_account_io(io->io_wbc, page, bh->b_size);
+	wbc_account_cgroup_owner(io->io_wbc, page, bh->b_size);
 	io->io_next_block++;
 	return 0;
 }
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index eda4181d2092..e1cab1717ac7 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -470,7 +470,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 	}
 
 	if (fio->io_wbc && !is_read_io(fio->op))
-		wbc_account_io(fio->io_wbc, page, PAGE_SIZE);
+		wbc_account_cgroup_owner(fio->io_wbc, page, PAGE_SIZE);
 
 	bio_set_op_attrs(bio, fio->op, fio->op_flags);
 
@@ -537,7 +537,7 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
 	}
 
 	if (fio->io_wbc)
-		wbc_account_io(fio->io_wbc, bio_page, PAGE_SIZE);
+		wbc_account_cgroup_owner(fio->io_wbc, bio_page, PAGE_SIZE);
 
 	io->last_block_in_bio = fio->new_blkaddr;
 	f2fs_trace_ios(fio, 0);
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index a8a40bc26c2f..0aef79e934bb 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -706,7 +706,7 @@ void wbc_detach_inode(struct writeback_control *wbc)
 EXPORT_SYMBOL_GPL(wbc_detach_inode);
 
 /**
- * wbc_account_io - account IO issued during writeback
+ * wbc_account_cgroup_owner - account writeback to update inode cgroup ownership
  * @wbc: writeback_control of the writeback in progress
  * @page: page being written out
  * @bytes: number of bytes being written out
@@ -715,8 +715,8 @@ EXPORT_SYMBOL_GPL(wbc_detach_inode);
  * controlled by @wbc.  Keep the book for foreign inode detection.  See
  * wbc_detach_inode().
  */
-void wbc_account_io(struct writeback_control *wbc, struct page *page,
-		    size_t bytes)
+void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
+			      size_t bytes)
 {
 	struct cgroup_subsys_state *css;
 	int id;
@@ -753,7 +753,7 @@ void wbc_account_io(struct writeback_control *wbc, struct page *page,
 	else
 		wbc->wb_tcand_bytes -= min(bytes, wbc->wb_tcand_bytes);
 }
-EXPORT_SYMBOL_GPL(wbc_account_io);
+EXPORT_SYMBOL_GPL(wbc_account_cgroup_owner);
 
 /**
  * inode_congested - test whether an inode is congested
diff --git a/fs/mpage.c b/fs/mpage.c
index 436a85260394..a63620cdb73a 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -647,7 +647,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
 	 * the confused fail path above (OOM) will be very confused when
 	 * it finds all bh marked clean (i.e. it will not write anything)
 	 */
-	wbc_account_io(wbc, page, PAGE_SIZE);
+	wbc_account_cgroup_owner(wbc, page, PAGE_SIZE);
 	length = first_unmapped << blkbits;
 	if (bio_add_page(bio, page, length, 0) < length) {
 		bio = mpage_bio_submit(REQ_OP_WRITE, op_flags, bio);
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 738a0c24874f..dda5cf228172 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -188,8 +188,8 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
 				 struct inode *inode)
 	__releases(&inode->i_lock);
 void wbc_detach_inode(struct writeback_control *wbc);
-void wbc_account_io(struct writeback_control *wbc, struct page *page,
-		    size_t bytes);
+void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
+			      size_t bytes);
 void cgroup_writeback_umount(void);
 
 /**
@@ -291,8 +291,8 @@ static inline void wbc_init_bio(struct writeback_control *wbc, struct bio *bio)
 {
 }
 
-static inline void wbc_account_io(struct writeback_control *wbc,
-				  struct page *page, size_t bytes)
+static inline void wbc_account_cgroup_owner(struct writeback_control *wbc,
+					    struct page *page, size_t bytes)
 {
 }
 
-- 
2.17.1