From 95732b19e767f1e8c6d566b5a3e7375b21623352 Mon Sep 17 00:00:00 2001
From: Patrick Mooney <pmooney@pfmooney.com>
Date: Thu, 17 Dec 2015 20:57:40 +0000
Subject: OS-5036 lxbrand needs sync_file_range syscall Reviewed by: Jerry
 Jelinek <jerry.jelinek@joyent.com>

---
 usr/src/uts/common/brand/lx/os/lx_syscall.c   |  4 +--
 usr/src/uts/common/brand/lx/sys/lx_syscalls.h |  1 +
 usr/src/uts/common/brand/lx/syscall/lx_sync.c | 49 +++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/usr/src/uts/common/brand/lx/os/lx_syscall.c b/usr/src/uts/common/brand/lx/os/lx_syscall.c
index 13857f3d22..b47b82be29 100644
--- a/usr/src/uts/common/brand/lx/os/lx_syscall.c
+++ b/usr/src/uts/common/brand/lx/os/lx_syscall.c
@@ -934,7 +934,7 @@ lx_sysent_t lx_sysent32[] = {
 	{"set_robust_list", lx_set_robust_list,	0,		2}, /* 311 */
 	{"get_robust_list", lx_get_robust_list,	0,		3}, /* 312 */
 	{"splice",	NULL,			NOSYS_NULL,	0}, /* 313 */
-	{"sync_file_range", NULL,		NOSYS_NULL,	0}, /* 314 */
+	{"sync_file_range", lx_sync_file_range,	0,		4}, /* 314 */
 	{"tee",		NULL,			NOSYS_NULL,	0}, /* 315 */
 	{"vmsplice",	NULL,			NOSYS_NULL,	0}, /* 316 */
 	{"move_pages",	NULL,			NOSYS_NULL,	0}, /* 317 */
@@ -1264,7 +1264,7 @@ lx_sysent_t lx_sysent64[] = {
 	{"get_robust_list", lx_get_robust_list,	0,		3}, /* 274 */
 	{"splice",	NULL,			NOSYS_NULL,	0}, /* 275 */
 	{"tee",		NULL,			NOSYS_NULL,	0}, /* 276 */
-	{"sync_file_range", NULL,		NOSYS_NULL,	0}, /* 277 */
+	{"sync_file_range", lx_sync_file_range,	0,		4}, /* 277 */
 	{"vmsplice",	NULL,			NOSYS_NULL,	0}, /* 278 */
 	{"move_pages",	NULL,			NOSYS_NULL,	0}, /* 279 */
 	{"utimensat",	NULL,			0,		4}, /* 280 */
diff --git a/usr/src/uts/common/brand/lx/sys/lx_syscalls.h b/usr/src/uts/common/brand/lx/sys/lx_syscalls.h
index c51763b056..7a32a1e1d8 100644
--- a/usr/src/uts/common/brand/lx/sys/lx_syscalls.h
+++ b/usr/src/uts/common/brand/lx/sys/lx_syscalls.h
@@ -117,6 +117,7 @@ extern long lx_setrlimit();
 extern long lx_setsockopt();
 extern long lx_socket();
 extern long lx_socketcall();
+extern long lx_sync_file_range();
 extern long lx_syncfs();
 extern long lx_sysinfo32();
 extern long lx_sysinfo64();
diff --git a/usr/src/uts/common/brand/lx/syscall/lx_sync.c b/usr/src/uts/common/brand/lx/syscall/lx_sync.c
index 327a73d3b7..614afca0b0 100644
--- a/usr/src/uts/common/brand/lx/syscall/lx_sync.c
+++ b/usr/src/uts/common/brand/lx/syscall/lx_sync.c
@@ -15,7 +15,10 @@
 
 #include <sys/systm.h>
 #include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/file.h>
 #include <sys/vfs.h>
+#include <sys/vnode.h>
 #include <sys/lx_impl.h>
 #include <sys/lx_brand.h>
 
@@ -35,3 +38,49 @@ lx_syncfs(int fd)
 
 	return (0);
 }
+
+#define	LX_SYNC_FILE_RANGE_WAIT_BEFORE	0x1
+#define	LX_SYNC_FILE_RANGE_WRITE	0x2
+#define	LX_SYNC_FILE_RANGE_WAIT_AFTER	0x4
+
+#define	LX_SYNC_FILE_RANGE_VALID	(LX_SYNC_FILE_RANGE_WAIT_BEFORE | \
+	LX_SYNC_FILE_RANGE_WRITE | LX_SYNC_FILE_RANGE_WAIT_AFTER)
+
+
+long
+lx_sync_file_range(int fd, off_t offset, off_t nbytes, int flags)
+{
+	file_t *fp;
+	int error, sflags = 0;
+
+	if ((flags & ~LX_SYNC_FILE_RANGE_VALID) != 0)
+		return (set_errno(EINVAL));
+	if (offset < 0 || nbytes < 0)
+		return (set_errno(EINVAL));
+
+	if ((fp = getf(fd)) == NULL)
+		return (set_errno(EBADF));
+
+	/*
+	 * Since sync_file_range is implemented in terms of VOP_PUTPAGE, both
+	 * SYNC_FILE_RANGE_WAIT flags are treated as forcing synchronous
+	 * operation.  While this differs from the Linux behavior where
+	 * BEFORE/AFTER are distinct, it achieves an adequate level of safety
+	 * since the requested data is synced out at the end of the call.
+	 */
+	if ((flags & (LX_SYNC_FILE_RANGE_WAIT_BEFORE |
+	    LX_SYNC_FILE_RANGE_WAIT_AFTER)) == 0) {
+		sflags |= B_ASYNC;
+	}
+
+	error = VOP_PUTPAGE(fp->f_vnode, offset, nbytes, sflags, CRED(), NULL);
+	if (error == ENOSYS) {
+		error = ESPIPE;
+	}
+
+	releasef(fd);
+	if (error != 0) {
+		return (set_errno(error));
+	}
+	return (0);
+}
-- 
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