From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-fsdevel@vger.kernel.org
Cc: linux-btrfs@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de,
linux-xfs@vger.kernel.org, Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 07/15] fs: Export generic_file_buffered_read()
Date: Thu, 5 Sep 2019 10:06:42 -0500 [thread overview]
Message-ID: <20190905150650.21089-8-rgoldwyn@suse.de> (raw)
In-Reply-To: <20190905150650.21089-1-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>
---
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 997a530ff4e9..26d827434060 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3041,6 +3041,8 @@ 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 d0cf700bf201..2121ae01eae8 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2014,7 +2014,7 @@ 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.
@@ -2023,11 +2023,11 @@ 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 the 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;
@@ -2168,7 +2168,7 @@ 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) {
@@ -2276,8 +2276,9 @@ 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
--
2.16.4
next prev parent reply other threads:[~2019-09-05 15:07 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-05 15:06 [PATCH v4 0/15] CoW support for iomap Goldwyn Rodrigues
2019-09-05 15:06 ` [PATCH 01/15] iomap: Use a srcmap for a read-modify-write I/O Goldwyn Rodrigues
2019-09-05 23:23 ` Darrick J. Wong
2019-09-05 15:06 ` [PATCH 02/15] iomap: Read page from srcmap if IOMAP_F_COW is set Goldwyn Rodrigues
2019-09-05 16:37 ` Christoph Hellwig
2019-09-05 20:28 ` Goldwyn Rodrigues
2019-09-05 15:06 ` [PATCH 03/15] btrfs: Eliminate PagePrivate for btrfs data pages Goldwyn Rodrigues
2019-09-05 15:06 ` [PATCH 04/15] btrfs: Add a simple buffered iomap write Goldwyn Rodrigues
2019-09-05 16:23 ` Christoph Hellwig
2019-09-05 20:42 ` Goldwyn Rodrigues
2019-09-06 5:54 ` Christoph Hellwig
2019-09-05 15:06 ` [PATCH 05/15] btrfs: Add CoW in iomap based writes Goldwyn Rodrigues
2019-09-05 15:06 ` [PATCH 06/15] btrfs: remove buffered write code made unnecessary Goldwyn Rodrigues
2019-09-05 15:06 ` Goldwyn Rodrigues [this message]
2019-09-05 15:06 ` [PATCH 08/15] btrfs: basic direct read operation Goldwyn Rodrigues
2019-09-05 16:25 ` Christoph Hellwig
2019-09-05 15:06 ` [PATCH 09/15] btrfs: Carve out btrfs_get_extent_map_write() out of btrfs_get_blocks_write() Goldwyn Rodrigues
2019-09-05 15:06 ` [PATCH 10/15] btrfs: Rename __endio_write_update_ordered() to btrfs_update_ordered_extent() Goldwyn Rodrigues
2019-09-05 15:06 ` [PATCH 11/15] iomap: use a function pointer for dio submits Goldwyn Rodrigues
2019-09-05 16:27 ` Christoph Hellwig
2019-09-05 23:24 ` Darrick J. Wong
2019-09-05 15:06 ` [PATCH 12/15] btrfs: Use iomap_dio_rw for performing direct I/O writes Goldwyn Rodrigues
2019-09-05 16:31 ` Christoph Hellwig
2019-09-05 15:06 ` [PATCH 13/15] btrfs: Remove btrfs_dio_data and __btrfs_direct_write Goldwyn Rodrigues
2019-09-05 16:32 ` Christoph Hellwig
2019-09-05 15:06 ` [PATCH 14/15] btrfs: update inode size during bio completion Goldwyn Rodrigues
2019-09-05 16:33 ` Christoph Hellwig
2019-09-05 15:06 ` [PATCH 15/15] xfs: Use the new iomap infrastructure for CoW Goldwyn Rodrigues
2019-09-06 16:55 ` Christoph Hellwig
2019-09-06 23:28 ` Dave Chinner
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