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[PATCH 1/3] hostmem: Detect and cache fs type for file hostmem
From: |
Peter Xu |
Subject: |
[PATCH 1/3] hostmem: Detect and cache fs type for file hostmem |
Date: |
Tue, 18 Apr 2023 18:57:47 -0400 |
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
+
name = host_memory_backend_get_name(backend);
ram_flags = backend->share ? RAM_SHARED : 0;
ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
@@ -181,6 +194,28 @@ static void file_backend_unparent(Object *obj)
}
}
+const char *file_memory_backend_get_fs_type(Object *obj)
+{
+#ifdef CONFIG_LINUX
+ HostMemoryBackendFile *fb = (HostMemoryBackendFile *)
+ object_dynamic_cast(obj, TYPE_MEMORY_BACKEND_FILE);
+
+ if (!fb) {
+ goto out;
+ }
+
+ switch (fb->fs_type) {
+ case TMPFS_MAGIC:
+ return "tmpfs";
+ case HUGETLBFS_MAGIC:
+ return "hugetlbfs";
+ }
+
+out:
+#endif
+ return "unknown";
+}
+
static void
file_backend_class_init(ObjectClass *oc, void *data)
{
diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h
index 39326f1d4f..0354cffa6b 100644
--- a/include/sysemu/hostmem.h
+++ b/include/sysemu/hostmem.h
@@ -81,5 +81,6 @@ void host_memory_backend_set_mapped(HostMemoryBackend
*backend, bool mapped);
bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
char *host_memory_backend_get_name(HostMemoryBackend *backend);
+const char *file_memory_backend_get_fs_type(Object *obj);
#endif
--
2.39.1