[PATCH v5] core/coio_file: Use eio_sendfile_sync instead of a chunk mode

[Cyrill Gorcunov <gorcunov@gmail.com>]

eio library provides a portable version of sendfile syscall
which works a way more efficient than explicit copying file
by 4K chunks.
---
v5:
 - Merge three patches into one
 - Update box/errinj test
 - Build as Release and rerun fio/box tests

 src/lib/core/coio_file.c | 33 ++++++++++++++++++---------------
 src/lib/core/errinj.h    |  1 +
 test/app/fio.result      | 23 +++++++++++++++++++++++
 test/app/fio.test.lua    |  8 ++++++++
 test/box/errinj.result   |  2 ++
 5 files changed, 52 insertions(+), 15 deletions(-)

diff --git a/src/lib/core/coio_file.c b/src/lib/core/coio_file.c
index c5b2db781..3caf185a5 100644
--- a/src/lib/core/coio_file.c
+++ b/src/lib/core/coio_file.c
@@ -33,6 +33,7 @@
 #include "fiber.h"
 #include "say.h"
 #include "fio.h"
+#include "errinj.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <dirent.h>
@@ -570,8 +571,9 @@ coio_readdir(const char *dir_path, char **buf)
 static void
 coio_do_copyfile(eio_req *req)
 {
+	struct errinj *inj = errinj(ERRINJ_COIO_SENDFILE_CHUNK, ERRINJ_INT);
 	struct coio_file_task *eio = (struct coio_file_task *)req->data;
-
+	off_t pos, ret, left, chunk;
 	struct stat st;
 	if (stat(eio->copyfile.source, &st) < 0) {
 		goto error;
@@ -588,22 +590,23 @@ coio_do_copyfile(eio_req *req)
 		goto error_dest;
 	}
 
-	enum { COPY_FILE_BUF_SIZE = 4096 };
-
-	char buf[COPY_FILE_BUF_SIZE];
-
-	while (true) {
-		ssize_t nread = fio_read(source_fd, buf, sizeof(buf));
-		if (nread < 0)
-			goto error_copy;
-
-		if (nread == 0)
-			break; /* eof */
-
-		ssize_t nwritten = fio_writen(dest_fd, buf, nread);
-		if (nwritten < 0)
+	if (inj != NULL && inj->iparam > 0)
+		chunk = (off_t)inj->iparam;
+	else
+		chunk = st.st_size;
+
+	for (left = st.st_size, pos = 0; left > 0;) {
+		ret = eio_sendfile_sync(dest_fd, source_fd, pos, chunk);
+		if (ret < 0) {
+			say_syserror("sendfile, [%s -> %s]",
+				     fio_filename(source_fd),
+				     fio_filename(dest_fd));
 			goto error_copy;
+		}
+		pos += ret;
+		left -= ret;
 	}
+
 	req->result = 0;
 	close(source_fd);
 	close(dest_fd);
diff --git a/src/lib/core/errinj.h b/src/lib/core/errinj.h
index 4bca81caf..462c98464 100644
--- a/src/lib/core/errinj.h
+++ b/src/lib/core/errinj.h
@@ -129,6 +129,7 @@ struct errinj {
 	_(ERRINJ_MEMTX_DELAY_GC, ERRINJ_BOOL, {.bparam = false}) \
 	_(ERRINJ_SIO_READ_MAX, ERRINJ_INT, {.iparam = -1}) \
 	_(ERRINJ_SQL_NAME_NORMALIZATION, ERRINJ_BOOL, {.bparam = false}) \
+	_(ERRINJ_COIO_SENDFILE_CHUNK, ERRINJ_INT, {.iparam = -1}) \
 
 ENUM0(errinj_id, ERRINJ_LIST);
 extern struct errinj errinjs[];
diff --git a/test/app/fio.result b/test/app/fio.result
index 486cb8043..879e0a767 100644
--- a/test/app/fio.result
+++ b/test/app/fio.result
@@ -718,6 +718,9 @@ file2 = fio.pathjoin(tmp2, 'file.2')
 file3 = fio.pathjoin(tree, 'file.3')
 ---
 ...
+file4 = fio.pathjoin(tree, 'file.4')
+---
+...
 fh1 = fio.open(file1, { 'O_RDWR', 'O_TRUNC', 'O_CREAT' }, 0777)
 ---
 ...
@@ -752,6 +755,26 @@ fio.stat(fio.pathjoin(tmp2, "file.1")) ~= nil
 ---
 - true
 ...
+--- test copyfile to operate with one byte transfer
+errinj = box.error.injection
+---
+...
+errinj.set('ERRINJ_COIO_SENDFILE_CHUNK', 1)
+---
+- ok
+...
+fio.copyfile(file1, file4)
+---
+- true
+...
+fio.stat(file1, file4) ~= nil
+---
+- true
+...
+errinj.set('ERRINJ_COIO_SENDFILE_CHUNK', -1)
+---
+- ok
+...
 res, err = fio.copyfile(fio.pathjoin(tmp1, 'not_exists.txt'), tmp1)
 ---
 ...
diff --git a/test/app/fio.test.lua b/test/app/fio.test.lua
index 9af37044d..1255b2804 100644
--- a/test/app/fio.test.lua
+++ b/test/app/fio.test.lua
@@ -230,6 +230,7 @@ fio.mktree(tree2, 0777)
 file1 = fio.pathjoin(tmp1, 'file.1')
 file2 = fio.pathjoin(tmp2, 'file.2')
 file3 = fio.pathjoin(tree, 'file.3')
+file4 = fio.pathjoin(tree, 'file.4')
 
 fh1 = fio.open(file1, { 'O_RDWR', 'O_TRUNC', 'O_CREAT' }, 0777)
 fh1:write("gogo")
@@ -241,6 +242,13 @@ fio.symlink(file1, file3)
 fio.copyfile(file1, tmp2)
 fio.stat(fio.pathjoin(tmp2, "file.1")) ~= nil
 
+--- test copyfile to operate with one byte transfer
+errinj = box.error.injection
+errinj.set('ERRINJ_COIO_SENDFILE_CHUNK', 1)
+fio.copyfile(file1, file4)
+fio.stat(file1, file4) ~= nil
+errinj.set('ERRINJ_COIO_SENDFILE_CHUNK', -1)
+
 res, err = fio.copyfile(fio.pathjoin(tmp1, 'not_exists.txt'), tmp1)
 res
 err:match("failed to copy") ~= nil
diff --git a/test/box/errinj.result b/test/box/errinj.result
index 5905f8ee0..fe4ba63bd 100644
--- a/test/box/errinj.result
+++ b/test/box/errinj.result
@@ -38,6 +38,8 @@ errinj.info()
     state: false
   ERRINJ_VYRUN_INDEX_GARBAGE:
     state: false
+  ERRINJ_COIO_SENDFILE_CHUNK:
+    state: -1
   ERRINJ_VY_INDEX_FILE_RENAME:
     state: false
   ERRINJ_VY_POINT_ITER_WAIT:
-- 
2.20.1