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[Qemu-devel] [PATCH v4 11/33] hostmem-file: use whole file size if possi
From: |
Xiao Guangrong |
Subject: |
[Qemu-devel] [PATCH v4 11/33] hostmem-file: use whole file size if possible |
Date: |
Mon, 19 Oct 2015 08:53:57 +0800 |
Use the whole file size if @size is not specified which is useful
if we want to directly pass a file to guest
Signed-off-by: Xiao Guangrong <address@hidden>
---
backends/hostmem-file.c | 48 ++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 44 insertions(+), 4 deletions(-)
diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index 9097a57..e1bc9ff 100644
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -9,6 +9,9 @@
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+
#include "qemu-common.h"
#include "sysemu/hostmem.h"
#include "sysemu/sysemu.h"
@@ -33,20 +36,57 @@ struct HostMemoryBackendFile {
char *mem_path;
};
+static uint64_t get_file_size(const char *file)
+{
+ struct stat stat_buf;
+ uint64_t size = 0;
+ int fd;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ return 0;
+ }
+
+ if (stat(file, &stat_buf) < 0) {
+ goto exit;
+ }
+
+ if ((S_ISBLK(stat_buf.st_mode)) && !ioctl(fd, BLKGETSIZE64, &size)) {
+ goto exit;
+ }
+
+ size = lseek(fd, 0, SEEK_END);
+ if (size == -1) {
+ size = 0;
+ }
+exit:
+ close(fd);
+ return size;
+}
+
static void
file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
{
HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(backend);
- if (!backend->size) {
- error_setg(errp, "can't create backend with size 0");
- return;
- }
if (!fb->mem_path) {
error_setg(errp, "mem-path property not set");
return;
}
+ if (!backend->size) {
+ /*
+ * use the whole file size if @size is not specified.
+ */
+ backend->size = get_file_size(fb->mem_path);
+ }
+
+ if (!backend->size) {
+ error_setg(errp, "failed to get file size for %s, can't create "
+ "backend on it", mem_path);
+ return;
+ }
+
backend->force_prealloc = mem_prealloc;
memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
object_get_canonical_path(OBJECT(backend)),
--
1.8.3.1
- [Qemu-devel] [PATCH v4 00/33] implement vNVDIMM, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 04/33] acpi: add aml_concatenate, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 02/33] acpi: add aml_sizeof, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 05/33] acpi: add aml_object_type, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 06/33] acpi: add aml_method_serialized, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 03/33] acpi: add aml_create_field, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 01/33] acpi: add aml_derefof, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 07/33] util: introduce qemu_file_get_page_size(), Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 10/33] hostmem-file: clean up memory allocation, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 08/33] exec: allow memory to be allocated from any kind of path, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 11/33] hostmem-file: use whole file size if possible,
Xiao Guangrong <=
- [Qemu-devel] [PATCH v4 09/33] exec: allow file_ram_alloc to work on file, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 12/33] pc-dimm: remove DEFAULT_PC_DIMMSIZE, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 13/33] pc-dimm: make pc_existing_dimms_capacity static and rename it, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 15/33] stubs: rename qmp_pc_dimm_device_list.c, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 14/33] pc-dimm: drop the prefix of pc-dimm, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 16/33] pc-dimm: rename pc-dimm.c and pc-dimm.h, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 17/33] dimm: abstract dimm device from pc-dimm, Xiao Guangrong, 2015/10/18
- [Qemu-devel] [PATCH v4 18/33] dimm: get mapped memory region from DIMMDeviceClass->get_memory_region, Xiao Guangrong, 2015/10/18