[PATCH v7 11/35] util: introduce qemu_file_getlength()

[Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>]

It is used to get the size of the specified file, also qemu_fd_getlength()
is introduced to unify the code with raw_getlength() in block/raw-posix.c

Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
 block/raw-posix.c    |  7 +------
 include/qemu/osdep.h |  2 ++
 util/osdep.c         | 31 +++++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/block/raw-posix.c b/block/raw-posix.c
index 918c756..734e6dd 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1592,18 +1592,13 @@ static int64_t raw_getlength(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     int ret;
-    int64_t size;
 
     ret = fd_open(bs);
     if (ret < 0) {
         return ret;
     }
 
-    size = lseek(s->fd, 0, SEEK_END);
-    if (size < 0) {
-        return -errno;
-    }
-    return size;
+    return qemu_fd_getlength(s->fd);
 }
 #endif
 
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index dbc17dc..ca4c3fa 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -303,4 +303,6 @@ int qemu_read_password(char *buf, int buf_size);
 pid_t qemu_fork(Error **errp);
 
 size_t qemu_file_get_page_size(const char *mem_path, Error **errp);
+int64_t qemu_fd_getlength(int fd);
+size_t qemu_file_getlength(const char *file, Error **errp);
 #endif
diff --git a/util/osdep.c b/util/osdep.c
index 0092bb6..5a61e19 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -428,3 +428,34 @@ writev(int fd, const struct iovec *iov, int iov_cnt)
     return readv_writev(fd, iov, iov_cnt, true);
 }
 #endif
+
+int64_t qemu_fd_getlength(int fd)
+{
+    int64_t size;
+
+    size = lseek(fd, 0, SEEK_END);
+    if (size < 0) {
+        return -errno;
+    }
+    return size;
+}
+
+size_t qemu_file_getlength(const char *file, Error **errp)
+{
+    int64_t size;
+    int fd = qemu_open(file, O_RDONLY);
+
+    if (fd < 0) {
+        error_setg_file_open(errp, errno, file);
+        return 0;
+    }
+
+    size = qemu_fd_getlength(fd);
+    if (size < 0) {
+        error_setg_errno(errp, -size, "can't get size of file %s", file);
+        size = 0;
+    }
+
+    qemu_close(fd);
+    return size;
+}
-- 
1.8.3.1

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