iomap: add a private argument for iomap_file_buffered_write

In order to switch fuse over to using iomap for buffered writes we need
to be able to have the struct file for the original write, in case we
have to read in the page to make it uptodate.  Handle this by using the
existing private field in the iomap_iter, and add the argument to
iomap_file_buffered_write.  This will allow us to pass the file in
through the iomap buffered write path, and is flexible for any other
file systems needs.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/7f55c7c32275004ba00cddf862d970e6e633f750.1724755651.git.josef@toxicpanda.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

6 files changed, 7 insertions, 6 deletions

diff --git a/block/fops.c b/block/fops.c
index 9825c1713a49..d16a6dddb12a 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -665,7 +665,7 @@ blkdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
 
 static ssize_t blkdev_buffered_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	return iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops);
+	return iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops, NULL);
 }
 
 /*
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 08982937b5df..f7dd64856c9b 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -1057,7 +1057,7 @@ retry:
 	}
 
 	pagefault_disable();
-	ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+	ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops, NULL);
 	pagefault_enable();
 	if (ret > 0)
 		written += ret;
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index d745f718bcde..e79d11701553 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1022,13 +1022,14 @@ retry:
 
 ssize_t
 iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
-		const struct iomap_ops *ops)
+		const struct iomap_ops *ops, void *private)
 {
 	struct iomap_iter iter = {
 		.inode		= iocb->ki_filp->f_mapping->host,
 		.pos		= iocb->ki_pos,
 		.len		= iov_iter_count(i),
 		.flags		= IOMAP_WRITE,
+		.private	= private,
 	};
 	ssize_t ret;
 
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 4cdc54dc9686..e9c693bb20bc 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -760,7 +760,7 @@ write_retry:
 
 	trace_xfs_file_buffered_write(iocb, from);
 	ret = iomap_file_buffered_write(iocb, from,
-			&xfs_buffered_write_iomap_ops);
+			&xfs_buffered_write_iomap_ops, NULL);
 
 	/*
 	 * If we hit a space limit, try to free up some lingering preallocated
diff --git a/fs/zonefs/file.c b/fs/zonefs/file.c
index 3b103715acc9..35166c92420c 100644
--- a/fs/zonefs/file.c
+++ b/fs/zonefs/file.c
@@ -563,7 +563,7 @@ static ssize_t zonefs_file_buffered_write(struct kiocb *iocb,
 	if (ret <= 0)
 		goto inode_unlock;
 
-	ret = iomap_file_buffered_write(iocb, from, &zonefs_write_iomap_ops);
+	ret = iomap_file_buffered_write(iocb, from, &zonefs_write_iomap_ops, NULL);
 	if (ret == -EIO)
 		zonefs_io_error(inode, true);
 
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 6fc1c858013d..f792b37f7627 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -257,7 +257,7 @@ static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i)
 }
 
 ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
-		const struct iomap_ops *ops);
+		const struct iomap_ops *ops, void *private);
 int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
 		struct iomap *iomap, loff_t pos, loff_t length, ssize_t written,
 		int (*punch)(struct inode *inode, loff_t pos, loff_t length));