qemu-kvm/kvm-util-mmap-alloc-qemu_fd_getfs.patch

From 439a8cdd010dfd253fc2277ae4ec605b5ba621d9 Mon Sep 17 00:00:00 2001
From: Peter Xu <peterx@redhat.com>
Date: Wed, 19 Apr 2023 12:17:36 -0400
Subject: [PATCH 02/56] util/mmap-alloc: qemu_fd_getfs()
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RH-Author: Peter Xu <peterx@redhat.com>
RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
RH-Bugzilla: 2057267
RH-Acked-by: Leonardo Brás <leobras@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: quintela1 <quintela@redhat.com>
RH-Commit: [1/50] 8970b5ae611a933d693e0c90cbf4eda073635494 (peterx/qemu-kvm)

This new helper fetches file system type for a fd.  Only Linux is
implemented so far.  Currently only tmpfs and hugetlbfs are defined,
but it can grow as needed.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit fa45f8dab9613993c042176ea2d25552bfebc955)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/qemu/mmap-alloc.h |  7 +++++++
 util/mmap-alloc.c         | 28 ++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
index 2825e231a7..8344daaa03 100644
--- a/include/qemu/mmap-alloc.h
+++ b/include/qemu/mmap-alloc.h
@@ -1,8 +1,15 @@
 #ifndef QEMU_MMAP_ALLOC_H
 #define QEMU_MMAP_ALLOC_H
 
+typedef enum {
+    QEMU_FS_TYPE_UNKNOWN = 0,
+    QEMU_FS_TYPE_TMPFS,
+    QEMU_FS_TYPE_HUGETLBFS,
+    QEMU_FS_TYPE_NUM,
+} QemuFsType;
 
 size_t qemu_fd_getpagesize(int fd);
+QemuFsType qemu_fd_getfs(int fd);
 
 /**
  * qemu_ram_mmap: mmap anonymous memory, the specified file or device.
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index 5ed7d29183..ed14f9c64d 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -27,8 +27,36 @@
 
 #ifdef CONFIG_LINUX
 #include <sys/vfs.h>
+#include <linux/magic.h>
 #endif
 
+QemuFsType qemu_fd_getfs(int fd)
+{
+#ifdef CONFIG_LINUX
+    struct statfs fs;
+    int ret;
+
+    if (fd < 0) {
+        return QEMU_FS_TYPE_UNKNOWN;
+    }
+
+    do {
+        ret = fstatfs(fd, &fs);
+    } while (ret != 0 && errno == EINTR);
+
+    switch (fs.f_type) {
+    case TMPFS_MAGIC:
+        return QEMU_FS_TYPE_TMPFS;
+    case HUGETLBFS_MAGIC:
+        return QEMU_FS_TYPE_HUGETLBFS;
+    default:
+        return QEMU_FS_TYPE_UNKNOWN;
+    }
+#else
+    return QEMU_FS_TYPE_UNKNOWN;
+#endif
+}
+
 size_t qemu_fd_getpagesize(int fd)
 {
 #ifdef CONFIG_LINUX
-- 
2.39.1