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Message-Id: <20240520102033.9361-7-nj.shetty@samsung.com>
Date: Mon, 20 May 2024 15:50:19 +0530
From: Nitesh Shetty <nj.shetty@...sung.com>
To: Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>, Alasdair
Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>, Mikulas Patocka
<mpatocka@...hat.com>, Keith Busch <kbusch@...nel.org>, Christoph Hellwig
<hch@....de>, Sagi Grimberg <sagi@...mberg.me>, Chaitanya Kulkarni
<kch@...dia.com>, Alexander Viro <viro@...iv.linux.org.uk>, Christian
Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>
Cc: martin.petersen@...cle.com, bvanassche@....org, david@...morbit.com,
hare@...e.de, damien.lemoal@...nsource.wdc.com, anuj20.g@...sung.com,
joshi.k@...sung.com, nitheshshetty@...il.com, gost.dev@...sung.com, Nitesh
Shetty <nj.shetty@...sung.com>, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
dm-devel@...ts.linux.dev, linux-nvme@...ts.infradead.org,
linux-fsdevel@...r.kernel.org
Subject: [PATCH v20 06/12] fs, block: copy_file_range for def_blk_ops for
direct block device
For direct block device opened with O_DIRECT, use blkdev_copy_offload to
issue device copy offload, or use splice_copy_file_range in case
device copy offload capability is absent or the device files are not open
with O_DIRECT.
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Anuj Gupta <anuj20.g@...sung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@...sung.com>
---
block/fops.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/block/fops.c b/block/fops.c
index 376265935714..5a4bba4f43aa 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -17,6 +17,7 @@
#include <linux/fs.h>
#include <linux/iomap.h>
#include <linux/module.h>
+#include <linux/splice.h>
#include "blk.h"
static inline struct inode *bdev_file_inode(struct file *file)
@@ -754,6 +755,30 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
return ret;
}
+static ssize_t blkdev_copy_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ size_t len, unsigned int flags)
+{
+ struct block_device *in_bdev = I_BDEV(bdev_file_inode(file_in));
+ struct block_device *out_bdev = I_BDEV(bdev_file_inode(file_out));
+ ssize_t copied = 0;
+
+ if ((in_bdev == out_bdev) && bdev_max_copy_sectors(in_bdev) &&
+ (file_in->f_iocb_flags & IOCB_DIRECT) &&
+ (file_out->f_iocb_flags & IOCB_DIRECT)) {
+ copied = blkdev_copy_offload(in_bdev, pos_in, pos_out, len,
+ NULL, NULL, GFP_KERNEL);
+ if (copied < 0)
+ copied = 0;
+ } else {
+ copied = splice_copy_file_range(file_in, pos_in + copied,
+ file_out, pos_out + copied,
+ len - copied);
+ }
+
+ return copied;
+}
+
#define BLKDEV_FALLOC_FL_SUPPORTED \
(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
@@ -859,6 +884,7 @@ const struct file_operations def_blk_fops = {
.splice_write = iter_file_splice_write,
.fallocate = blkdev_fallocate,
.fop_flags = FOP_BUFFER_RASYNC,
+ .copy_file_range = blkdev_copy_file_range,
};
static __init int blkdev_init(void)
--
2.17.1
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