[Qemu-devel] [PATCH v3 07/32] util: introduce qemu_file_get_page_size()

[Xiao Guangrong <guangrong.xiao@linux.intel.com>]

There are three places use the some logic to get the page size on
the file path or file fd

This patch introduces qemu_file_get_page_size() to unify the code

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
 include/qemu/osdep.h |  1 +
 target-ppc/kvm.c     | 21 +++------------------
 util/oslib-posix.c   | 16 ++++++++++++++++
 util/oslib-win32.c   |  5 +++++
 4 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index ef21efb..9c8c0c4 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -286,4 +286,5 @@ void os_mem_prealloc(int fd, char *area, size_t sz);
 
 int qemu_read_password(char *buf, int buf_size);
 
+size_t qemu_file_get_page_size(const char *mem_path);
 #endif
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index f8ea783..ed3424e 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -306,28 +306,13 @@ static void kvm_get_smmu_info(PowerPCCPU *cpu, struct kvm_ppc_smmu_info *info)
 
 static long gethugepagesize(const char *mem_path)
 {
-    struct statfs fs;
-    int ret;
-
-    do {
-        ret = statfs(mem_path, &fs);
-    } while (ret != 0 && errno == EINTR);
+    long size = qemu_file_get_page_size(mem_path);
 
-    if (ret != 0) {
-        fprintf(stderr, "Couldn't statfs() memory path: %s\n",
-                strerror(errno));
+    if (!size) {
         exit(1);
     }
 
-#define HUGETLBFS_MAGIC       0x958458f6
-
-    if (fs.f_type != HUGETLBFS_MAGIC) {
-        /* Explicit mempath, but it's ordinary pages */
-        return getpagesize();
-    }
-
-    /* It's hugepage, return the huge page size */
-    return fs.f_bsize;
+    return size;
 }
 
 static int find_max_supported_pagesize(Object *obj, void *opaque)
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index a0fcdc2..6b5c612 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -380,6 +380,22 @@ static size_t fd_getpagesize(int fd)
     return getpagesize();
 }
 
+size_t qemu_file_get_page_size(const char *path)
+{
+    size_t size = 0;
+    int fd = qemu_open(path, O_RDONLY);
+
+    if (fd < 0) {
+        fprintf(stderr, "Could not open %s.\n", path);
+        goto exit;
+    }
+
+    size = fd_getpagesize(fd);
+    qemu_close(fd);
+exit:
+    return size;
+}
+
 void os_mem_prealloc(int fd, char *area, size_t memory)
 {
     int ret;
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 08f5a9c..1ff1fae 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -462,6 +462,11 @@ size_t getpagesize(void)
     return system_info.dwPageSize;
 }
 
+size_t qemu_file_get_page_size(const char *path)
+{
+    return getpagesize();
+}
+
 void os_mem_prealloc(int fd, char *area, size_t memory)
 {
     int i;
-- 
1.8.3.1