Detect the file system for a memory-backend-file object and cache it within
the object if possible when CONFIG_LINUX (using statfs).
Only support the two important types of memory (tmpfs, hugetlbfs) and keep
the rest as "unknown" for now.
Signed-off-by: Peter Xu <peterx@redhat.com>
---
backends/hostmem-file.c | 37 ++++++++++++++++++++++++++++++++++++-
include/sysemu/hostmem.h | 1 +
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index 25141283c4..2484e45a11 100644
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -18,13 +18,17 @@
#include "sysemu/hostmem.h"
#include "qom/object_interfaces.h"
#include "qom/object.h"
+#ifdef CONFIG_LINUX
+#include <sys/vfs.h>
+#include <linux/magic.h>
+#endif
OBJECT_DECLARE_SIMPLE_TYPE(HostMemoryBackendFile, MEMORY_BACKEND_FILE)
struct HostMemoryBackendFile {
HostMemoryBackend parent_obj;
-
+ __fsword_t fs_type;
char *mem_path;
uint64_t align;
bool discard_data;
@@ -52,6 +56,15 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error
**errp)
return;
}
+#ifdef CONFIG_LINUX
+ struct statfs fs;
+ if (!statfs(fb->mem_path, &fs)) {
+ fb->fs_type = fs.f_type;
+ } else {
+ fb->fs_type = 0;
+ }
+#endif
+