[PATCH v7 4/8] fs, block: copy_file_range for def_blk_ops for direct block device.

Nitesh Shetty
2023-02-20T12:48:43Z

For direct block device, use copy_file_range to issue device copy offload,
and fallback to generic_copy_file_range incase device copy offload
capability is absent. Modify checks to allow bdevs to use copy_file_range.

Suggested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
---
block/blk-lib.c | 22 ++++++++++++++++++++++
block/fops.c | 18 ++++++++++++++++++
fs/read_write.c | 11 +++++++++--
include/linux/blkdev.h | 3 +++
4 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 74f58faf82d8..6593de525a26 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -475,6 +475,28 @@ static inline bool blk_check_copy_offload(struct request_queue *q_in,
return blk_queue_copy(q_in) && blk_queue_copy(q_out);
}

+int blkdev_copy_offload(struct block_device *bdev_in, loff_t pos_in,
+ struct block_device *bdev_out, loff_t pos_out, size_t len,
+ cio_iodone_t end_io, void *private, gfp_t gfp_mask)
+{
+ struct request_queue *in_q = bdev_get_queue(bdev_in);
+ struct request_queue *out_q = bdev_get_queue(bdev_out);
+ int ret = -EINVAL;
+ bool offload = false;
+
+ ret = blk_copy_sanity_check(bdev_in, pos_in, bdev_out, pos_out, len);
+ if (ret)
+ return ret;
+
+ offload = blk_check_copy_offload(in_q, out_q);
+ if (offload)
+ ret = __blk_copy_offload(bdev_in, pos_in, bdev_out, pos_out,
+ len, end_io, private, gfp_mask);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(blkdev_copy_offload);
+
/*
* @bdev_in: source block device
* @pos_in: source offset
diff --git a/block/fops.c b/block/fops.c
index 50d245e8c913..bcb9ee6565ea 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -596,6 +596,23 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
return ret;
}

+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));
+ int comp_len;
+
+ comp_len = blkdev_copy_offload(in_bdev, pos_in, out_bdev, pos_out, len,
+ NULL, NULL, GFP_KERNEL);
+ if (comp_len != len)
+ comp_len = generic_copy_file_range(file_in, pos_in + comp_len,
+ file_out, pos_out + comp_len, len - comp_len, flags);
+
+ return comp_len;
+}
+
#define BLKDEV_FALLOC_FL_SUPPORTED \
(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
@@ -679,6 +696,7 @@ const struct file_operations def_blk_fops = {
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = blkdev_fallocate,
+ .copy_file_range = blkdev_copy_file_range,
};

static __init int blkdev_init(void)
diff --git a/fs/read_write.c b/fs/read_write.c
index 7a2ff6157eda..62e925e9b2f0 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -20,6 +20,7 @@
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/fs.h>
+#include <linux/blkdev.h>
#include "internal.h"

#include <linux/uaccess.h>
@@ -1448,7 +1449,11 @@ static int generic_copy_file_checks(struct file *file_in, loff_t pos_in,
return -EOVERFLOW;

/* Shorten the copy to EOF */
- size_in = i_size_read(inode_in);
+ if (S_ISBLK(inode_in->i_mode))
+ size_in = bdev_nr_bytes(I_BDEV(file_in->f_mapping->host));
+ else
+ size_in = i_size_read(inode_in);
+
if (pos_in >= size_in)
count = 0;
else
@@ -1709,7 +1714,9 @@ int generic_file_rw_checks(struct file *file_in, struct file *file_out)
/* Don't copy dirs, pipes, sockets... */
if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
return -EISDIR;
- if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+
+ if ((!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) &&
+ (!S_ISBLK(inode_in->i_mode) || !S_ISBLK(inode_out->i_mode)))
return -EINVAL;

if (!(file_in->f_mode & FMODE_READ) ||
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 766761911190..ca7828b25d90 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1066,6 +1066,9 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
int blkdev_issue_copy(struct block_device *bdev_in, loff_t pos_in,
struct block_device *bdev_out, loff_t pos_out, size_t len,
cio_iodone_t end_io, void *private, gfp_t gfp_mask);
+int blkdev_copy_offload(struct block_device *bdev_in, loff_t pos_in,
+ struct block_device *bdev_out, loff_t pos_out, size_t len,
+ cio_iodone_t end_io, void *private, gfp_t gfp_mask);
struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len,
gfp_t gfp_mask);
void bio_map_kern_endio(struct bio *bio);
--
2.35.1.500.gb896f729e2