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[Qemu-devel] [PATCH v6 06/24] memfd: add fallback for memfd
From: |
marcandre . lureau |
Subject: |
[Qemu-devel] [PATCH v6 06/24] memfd: add fallback for memfd |
Date: |
Tue, 29 Sep 2015 18:34:36 +0200 |
From: Marc-André Lureau <address@hidden>
Add an open/unlink/mmap fallback for system that do not support memfd.
This patch may require additional SELinux policies to work for enforced
systems, but should gracefully fail nonetheless.
Signed-off-by: Marc-André Lureau <address@hidden>
---
util/memfd.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/util/memfd.c b/util/memfd.c
index 3168902..970b5b0 100644
--- a/util/memfd.c
+++ b/util/memfd.c
@@ -84,8 +84,26 @@ void *qemu_memfd_alloc(const char *name, size_t size,
unsigned int seals,
return NULL;
}
} else {
- perror("memfd");
- return NULL;
+ 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);
--
2.4.3
- [Qemu-devel] [PATCH v6 00/24] vhost-user: add migration support, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 08/24] vhost: add vhost_set_log_base op, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 09/24] vhost-user: add vhost_user_requires_shm_log(), marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 11/24] vhost-user: send log shm fd along with log_base, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 14/24] vhost-user: document migration log, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 15/24] net: add trace_vhost_user_event, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 13/24] vhost: use a function for each call, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 06/24] memfd: add fallback for memfd,
marcandre . lureau <=
- [Qemu-devel] [PATCH v6 16/24] vhost user: add support of live migration, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 23/24] vhost-user-test: check ownership during migration, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 22/24] vhost-user-test: add live-migration test, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 24/24] vhost-user: use an enum helper for features mask, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 01/24] vhost-user: unit test for new messages, marcandre . lureau, 2015/10/08
- [Qemu-devel] [PATCH v6 04/24] util: add linux-only memfd fallback, marcandre . lureau, 2015/10/08