util/mmap-alloc: qemu_fd_getfs()

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>

diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
index 2825e231a723e513ca55ef206103f84238c068c4..8344daaa03f2d48819fdd3d6f1fef862b8eacd3a 100644 (file)
--- 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 5ed7d29183ec8c8cc1eb8f6a664a34c4b04b1476..ed14f9c64de510e1add0e1b1e29844e43a36f012 100644 (file)
--- 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