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96 lines
2.6 KiB
96 lines
2.6 KiB
From 439a8cdd010dfd253fc2277ae4ec605b5ba621d9 Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Wed, 19 Apr 2023 12:17:36 -0400
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Subject: [PATCH 02/56] util/mmap-alloc: qemu_fd_getfs()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Peter Xu <peterx@redhat.com>
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RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
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RH-Bugzilla: 2057267
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RH-Acked-by: Leonardo Brás <leobras@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: quintela1 <quintela@redhat.com>
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RH-Commit: [1/50] 8970b5ae611a933d693e0c90cbf4eda073635494 (peterx/qemu-kvm)
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This new helper fetches file system type for a fd. Only Linux is
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implemented so far. Currently only tmpfs and hugetlbfs are defined,
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but it can grow as needed.
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit fa45f8dab9613993c042176ea2d25552bfebc955)
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Signed-off-by: Peter Xu <peterx@redhat.com>
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---
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include/qemu/mmap-alloc.h | 7 +++++++
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util/mmap-alloc.c | 28 ++++++++++++++++++++++++++++
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2 files changed, 35 insertions(+)
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diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
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index 2825e231a7..8344daaa03 100644
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--- a/include/qemu/mmap-alloc.h
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+++ b/include/qemu/mmap-alloc.h
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@@ -1,8 +1,15 @@
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#ifndef QEMU_MMAP_ALLOC_H
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#define QEMU_MMAP_ALLOC_H
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+typedef enum {
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+ QEMU_FS_TYPE_UNKNOWN = 0,
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+ QEMU_FS_TYPE_TMPFS,
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+ QEMU_FS_TYPE_HUGETLBFS,
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+ QEMU_FS_TYPE_NUM,
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+} QemuFsType;
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size_t qemu_fd_getpagesize(int fd);
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+QemuFsType qemu_fd_getfs(int fd);
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/**
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* qemu_ram_mmap: mmap anonymous memory, the specified file or device.
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diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
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index 5ed7d29183..ed14f9c64d 100644
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--- a/util/mmap-alloc.c
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+++ b/util/mmap-alloc.c
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@@ -27,8 +27,36 @@
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#ifdef CONFIG_LINUX
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#include <sys/vfs.h>
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+#include <linux/magic.h>
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#endif
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+QemuFsType qemu_fd_getfs(int fd)
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+{
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+#ifdef CONFIG_LINUX
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+ struct statfs fs;
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+ int ret;
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+
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+ if (fd < 0) {
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+ return QEMU_FS_TYPE_UNKNOWN;
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+ }
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+
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+ do {
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+ ret = fstatfs(fd, &fs);
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+ } while (ret != 0 && errno == EINTR);
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+
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+ switch (fs.f_type) {
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+ case TMPFS_MAGIC:
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+ return QEMU_FS_TYPE_TMPFS;
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+ case HUGETLBFS_MAGIC:
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+ return QEMU_FS_TYPE_HUGETLBFS;
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+ default:
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+ return QEMU_FS_TYPE_UNKNOWN;
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+ }
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+#else
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+ return QEMU_FS_TYPE_UNKNOWN;
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+#endif
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+}
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+
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size_t qemu_fd_getpagesize(int fd)
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{
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#ifdef CONFIG_LINUX
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--
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2.39.1
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