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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-btrfs@vger.kernel.org
Cc: Goldwyn Rodrigues <rgoldwyn@suse.com>,
	Johannes Thumshirn <jthumshirn@suse.de>,
	Christoph Hellwig <hch@lst.de>
Subject: [PATCH 1/9] fs: Export generic_file_buffered_read()
Date: Thu, 26 Mar 2020 16:02:46 -0500
Message-ID: <20200326210254.17647-2-rgoldwyn@suse.de> (raw)
In-Reply-To: <20200326210254.17647-1-rgoldwyn@suse.de>

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

Export generic_file_buffered_read() to be used to
supplement incomplete direct reads.

While we are at it, correct the comments and variable names.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/fs.h |  2 ++
 mm/filemap.c       | 13 +++++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index abedbffe2c9e..8a29389884bc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3117,6 +3117,8 @@ extern int generic_file_rw_checks(struct file *file_in, struct file *file_out);
 extern int generic_copy_file_checks(struct file *file_in, loff_t pos_in,
 				    struct file *file_out, loff_t pos_out,
 				    size_t *count, unsigned int flags);
+extern ssize_t generic_file_buffered_read(struct kiocb *iocb,
+		struct iov_iter *to, ssize_t already_read);
 extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
 extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
 extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
diff --git a/mm/filemap.c b/mm/filemap.c
index 1784478270e1..4266ec3e9d24 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1972,7 +1972,7 @@ static void shrink_readahead_size_eio(struct file *filp,
  * generic_file_buffered_read - generic file read routine
  * @iocb:	the iocb to read
  * @iter:	data destination
- * @written:	already copied
+ * @copied:	already copied
  *
  * This is a generic file read routine, and uses the
  * mapping->a_ops->readpage() function for the actual low-level stuff.
@@ -1981,11 +1981,11 @@ static void shrink_readahead_size_eio(struct file *filp,
  * of the logic when it comes to error handling etc.
  *
  * Return:
- * * total number of bytes copied, including those the were already @written
+ * * total number of bytes copied, including those that were @copied
  * * negative error code if nothing was copied
  */
-static ssize_t generic_file_buffered_read(struct kiocb *iocb,
-		struct iov_iter *iter, ssize_t written)
+ssize_t generic_file_buffered_read(struct kiocb *iocb,
+		struct iov_iter *iter, ssize_t copied)
 {
 	struct file *filp = iocb->ki_filp;
 	struct address_space *mapping = filp->f_mapping;
@@ -2126,7 +2126,7 @@ static ssize_t generic_file_buffered_read(struct kiocb *iocb,
 		prev_offset = offset;
 
 		put_page(page);
-		written += ret;
+		copied += ret;
 		if (!iov_iter_count(iter))
 			goto out;
 		if (ret < nr) {
@@ -2234,8 +2234,9 @@ static ssize_t generic_file_buffered_read(struct kiocb *iocb,
 
 	*ppos = ((loff_t)index << PAGE_SHIFT) + offset;
 	file_accessed(filp);
-	return written ? written : error;
+	return copied ? copied : error;
 }
+EXPORT_SYMBOL_GPL(generic_file_buffered_read);
 
 /**
  * generic_file_read_iter - generic filesystem read routine
-- 
2.25.0


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 21:02 [PATCH 0/9 v7] btrfs direct-io using iomap Goldwyn Rodrigues
2020-03-26 21:02 ` Goldwyn Rodrigues [this message]
2020-03-26 21:02 ` [PATCH 2/9] iomap: add a filesystem hook for direct I/O bio submission Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 3/9] iomap: Remove lockdep_assert_held() Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 4/9] btrfs: Switch to iomap_dio_rw() for dio Goldwyn Rodrigues
2020-03-27  8:10   ` Christoph Hellwig
2020-03-27 16:13     ` Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 5/9] btrfs: Use ->iomap_end() instead of btrfs_dio_data Goldwyn Rodrigues
2020-03-27  8:16   ` Christoph Hellwig
2020-03-27 16:11     ` Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 6/9] fs: Remove dio_end_io() Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 7/9] btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 8/9] btrfs: btrfs: split btrfs_direct_IO Goldwyn Rodrigues
2020-03-26 21:02 ` [PATCH 9/9] btrfs: unlock extents in ->iomap_end() for DIO reads Goldwyn Rodrigues
2020-03-27 15:56 ` [PATCH 0/9 v7] btrfs direct-io using iomap David Sterba

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