[RFC PATCH 8/8] iomap: Introduce iomap->dirty_page()

[Goldwyn Rodrigues]

From: Goldwyn Rodrigues <rgold...@suse.com>

In dirty_page(), we are clearing PageChecked, though I don't see it set.
Is this used for compression only?
Can we call __set_page_dirty_nobuffers instead?

Signed-off-by: Goldwyn Rodrigues <rgold...@suse.com>
---
 fs/btrfs/file.c       | 8 ++++++++
 fs/iomap.c            | 2 ++
 include/linux/iomap.h | 1 +
 3 files changed, 11 insertions(+)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 1c459c9001b2..ba304e782098 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1648,10 +1648,18 @@ static void btrfs_file_process_page(struct inode 
*inode, struct page *page)
        get_page(page);
 }
 
+static void btrfs_file_dirty_page(struct page *page)
+{
+       SetPageUptodate(page);
+       ClearPageChecked(page);
+       set_page_dirty(page);
+}
+
 const struct iomap_ops btrfs_iomap_ops = {
         .iomap_begin            = btrfs_file_iomap_begin,
         .iomap_end              = btrfs_file_iomap_end,
        .iomap_process_page     = btrfs_file_process_page,
+       .iomap_dirty_page       = btrfs_file_dirty_page,
 };
 
 static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
diff --git a/fs/iomap.c b/fs/iomap.c
index a32660b1b6c5..0907790c76c0 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -208,6 +208,8 @@ iomap_write_actor(struct inode *inode, loff_t pos, loff_t 
length, void *data,
                status = iomap_write_end(inode, pos, bytes, copied, page, 
iomap);
                if (unlikely(status < 0))
                        break;
+               if (ops->iomap_dirty_page)
+                       ops->iomap_dirty_page(page);
                copied = status;
 
                cond_resched();
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index fbb0194d56d6..7fbf6889dc54 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -76,6 +76,7 @@ struct iomap_ops {
                        ssize_t written, unsigned flags, struct iomap *iomap);
 
        void (*iomap_process_page)(struct inode *inode, struct page *page);
+       void (*iomap_dirty_page)(struct page *page);
 };
 
 ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
-- 
2.14.2

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