From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
While performing copy_file_range(), if superblocks of file_in and
file_out don't match, instead of returning -EXDEV, perform
splice for a faster copy.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
fs/read_write.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index 7d9dfb62ba7d..2c9e7a5ea806 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1546,6 +1546,8 @@ ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in,
size_t len, unsigned int flags,
unsigned int splice_flags)
{
+ struct inode *inode_in = file_inode(file_in);
+ struct inode *inode_out = file_inode(file_out);
ssize_t ret = 0;
if (flags != 0)
@@ -1554,6 +1556,9 @@ ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in,
if (len == 0)
return 0;
+ if (inode_in->i_sb != inode_out->i_sb)
+ goto splice;
+
/*
* Try cloning first, this is supported by more file systems, and
* more efficient if both clone and copy are supported (e.g. NFS).
@@ -1571,7 +1576,7 @@ ssize_t do_copy_file_range(struct file *file_in, loff_t pos_in,
if (ret != -EOPNOTSUPP)
return ret;
}
-
+splice:
ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out,
len > MAX_RW_COUNT ? MAX_RW_COUNT : len, splice_flags);
return ret;
@@ -1608,10 +1613,6 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
(file_out->f_flags & O_APPEND))
return -EBADF;
- /* this could be relaxed once a method supports cross-fs copies */
- if (inode_in->i_sb != inode_out->i_sb)
- return -EXDEV;
-
file_start_write(file_out);
ret = do_copy_file_range(file_in, pos_in,
--
2.16.3
--
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