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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@redhat.com>
Acked-by: Jan Harkes <jaharkes@cs.cmu.edu>
cc: Christoph Hellwig <hch@lst.de>
cc: Jens Axboe <axboe@kernel.dk>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: John Hubbard <jhubbard@nvidia.com>
cc: David Hildenbrand <david@redhat.com>
cc: Matthew Wilcox <willy@infradead.org>
cc: coda@cs.cmu.edu
cc: codalist@coda.cs.cmu.edu
cc: linux-unionfs@vger.kernel.org
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-12-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells 2023-05-22 14:49:58 +01:00 committed by Jens Axboe
parent d4120d87a0
commit a1be2935d0
1 changed files with 28 additions and 1 deletions
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29
fs/coda/file.c
View File

@ -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 @@ finish_write:
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,
};