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[Qemu-devel] [PATCH v5 04/21] util: add memfd helpers
From: |
marcandre . lureau |
Subject: |
[Qemu-devel] [PATCH v5 04/21] util: add memfd helpers |
Date: |
Thu, 24 Sep 2015 18:22:04 +0200 |
From: Marc-André Lureau <address@hidden>
Add qemu_memfd_alloc/free() helpers.
The function helps to allocate and seal a memfd, and implements an
open/unlink/mmap fallback for system that do not support memfd.
Signed-off-by: Marc-André Lureau <address@hidden>
---
include/qemu/memfd.h | 4 +++
util/memfd.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 76 insertions(+), 2 deletions(-)
diff --git a/include/qemu/memfd.h b/include/qemu/memfd.h
index 8b1fe6a..950fb88 100644
--- a/include/qemu/memfd.h
+++ b/include/qemu/memfd.h
@@ -17,4 +17,8 @@
#define F_SEAL_WRITE 0x0008 /* prevent writes */
#endif
+void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
+ int *fd);
+void qemu_memfd_free(void *ptr, size_t size, int fd);
+
#endif /* QEMU_MEMFD_H */
diff --git a/util/memfd.c b/util/memfd.c
index a98d57e..8b2b785 100644
--- a/util/memfd.c
+++ b/util/memfd.c
@@ -27,6 +27,14 @@
#include "config-host.h"
+#include <glib.h>
+#include <glib/gprintf.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
#include "qemu/memfd.h"
#ifdef CONFIG_MEMFD
@@ -44,13 +52,75 @@
#define MFD_ALLOW_SEALING 0x0002U
#endif
-static inline int memfd_create(const char *name, unsigned int flags)
+static int memfd_create(const char *name, unsigned int flags)
{
return syscall(__NR_memfd_create, name, flags);
}
#else /* !LINUX */
-static inline int memfd_create(const char *name, unsigned int flags)
+static int memfd_create(const char *name, unsigned int flags)
{
return -1;
}
#endif
+
+void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
+ int *fd)
+{
+ void *ptr;
+ int mfd;
+
+ mfd = memfd_create(name, MFD_ALLOW_SEALING|MFD_CLOEXEC);
+ if (mfd != -1) {
+ if (ftruncate(mfd, size) == -1) {
+ perror("ftruncate");
+ close(mfd);
+ return NULL;
+ }
+
+ if (fcntl(mfd, F_ADD_SEALS, seals) == -1) {
+ perror("fcntl");
+ close(mfd);
+ return NULL;
+ }
+ } else {
+ const char *tmpdir = getenv("TMPDIR");
+ gchar *fname;
+
+ tmpdir = tmpdir ? tmpdir : "/tmp";
+
+ fname = g_strdup_printf("%s/memfd-XXXXXX", tmpdir);
+ mfd = mkstemp(fname);
+ unlink(fname);
+ g_free(fname);
+
+ if (mfd == -1) {
+ perror("mkstemp");
+ return NULL;
+ }
+
+ if (ftruncate(mfd, size) == -1) {
+ perror("ftruncate");
+ close(mfd);
+ return NULL;
+ }
+ }
+
+ ptr = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, mfd, 0);
+ if (ptr == MAP_FAILED) {
+ perror("mmap");
+ close(mfd);
+ return NULL;
+ }
+
+ *fd = mfd;
+ return ptr;
+}
+
+void qemu_memfd_free(void *ptr, size_t size, int fd)
+{
+ if (ptr) {
+ munmap(ptr, size);
+ }
+
+ close(fd);
+}
--
2.4.3
- [Qemu-devel] [PATCH v5 00/21] vhost-user: add migration support, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 01/21] vhost-user: unit test for new messages, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 02/21] configure: probe for memfd, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 03/21] util: add linux-only memfd fallback, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 04/21] util: add memfd helpers,
marcandre . lureau <=
- [Qemu-devel] [PATCH v5 05/21] vhost: alloc shareable log, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 06/21] vhost: document log resizing, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 07/21] vhost: add vhost_set_log_base op, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 09/21] vhost-user: add a migration blocker, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 08/21] vhost-user: send log shm fd along with log_base, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 11/21] vhost: only use shared log if in use by backend, marcandre . lureau, 2015/09/24
- [Qemu-devel] [PATCH v5 12/21] vhost-user: document migration log, marcandre . lureau, 2015/09/24