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Message-Id: <20230308165251.2078898-6-dhowells@redhat.com>
Date: Wed, 8 Mar 2023 16:52:42 +0000
From: David Howells <dhowells@...hat.com>
To: Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
Christoph Hellwig <hch@...radead.org>
Cc: David Howells <dhowells@...hat.com>,
Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
Jeff Layton <jlayton@...nel.org>,
David Hildenbrand <david@...hat.com>,
Jason Gunthorpe <jgg@...dia.com>,
Logan Gunthorpe <logang@...tatee.com>,
Hillf Danton <hdanton@...a.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Jan Harkes <jaharkes@...cmu.edu>,
Christoph Hellwig <hch@....de>,
John Hubbard <jhubbard@...dia.com>, coda@...cmu.edu,
codalist@...a.cs.cmu.edu, linux-unionfs@...r.kernel.org
Subject: [PATCH v17 05/14] coda: Implement splice-read
Implement splice-read for coda by passing the request down a layer rather
than going through generic_file_splice_read() which is going to be changed
to assume that ->read_folio() is present on buffered files.
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Jan Harkes <jaharkes@...cmu.edu>
cc: Christoph Hellwig <hch@....de>
cc: Jens Axboe <axboe@...nel.dk>
cc: Al Viro <viro@...iv.linux.org.uk>
cc: John Hubbard <jhubbard@...dia.com>
cc: David Hildenbrand <david@...hat.com>
cc: Matthew Wilcox <willy@...radead.org>
cc: coda@...cmu.edu
cc: codalist@...a.cs.cmu.edu
cc: linux-unionfs@...r.kernel.org
cc: linux-block@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
cc: linux-mm@...ck.org
---
Notes:
ver #17)
- Use vfs_splice_read() helper rather than open-coding checks.
fs/coda/file.c | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/fs/coda/file.c b/fs/coda/file.c
index 3f3c81e6b1ab..12b26bd13564 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -23,6 +23,7 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/uio.h>
+#include <linux/splice.h>
#include <linux/coda.h>
#include "coda_psdev.h"
@@ -94,6 +95,32 @@ coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
return ret;
}
+static ssize_t
+coda_file_splice_read(struct file *coda_file, loff_t *ppos,
+ struct pipe_inode_info *pipe,
+ size_t len, unsigned int flags)
+{
+ struct inode *coda_inode = file_inode(coda_file);
+ struct coda_file_info *cfi = coda_ftoc(coda_file);
+ struct file *in = cfi->cfi_container;
+ loff_t ki_pos = *ppos;
+ ssize_t ret;
+
+ ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ len, ki_pos, CODA_ACCESS_TYPE_READ);
+ if (ret)
+ goto finish_read;
+
+ ret = vfs_splice_read(in, ppos, pipe, len, flags);
+
+finish_read:
+ venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ len, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
+ return ret;
+}
+
static void
coda_vm_open(struct vm_area_struct *vma)
{
@@ -302,5 +329,5 @@ const struct file_operations coda_file_operations = {
.open = coda_open,
.release = coda_release,
.fsync = coda_fsync,
- .splice_read = generic_file_splice_read,
+ .splice_read = coda_file_splice_read,
};
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