[PATCH v5 15/25] block: Move qemu_fcntl_addfl() into osdep.c

[Hanna Czenczek <hreitz@redhat.com>]

Move file-posix's helper to add a flag (or a set of flags) to an FD's
existing set of flags into osdep.c for other places to use.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
---
 include/qemu/osdep.h |  1 +
 block/file-posix.c   | 17 +----------------
 util/osdep.c         | 18 ++++++++++++++++++
 3 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index b384b5b506..f151578b5c 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -633,6 +633,7 @@ int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
 int qemu_unlock_fd(int fd, int64_t start, int64_t len);
 int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive);
 bool qemu_has_ofd_lock(void);
+int qemu_fcntl_addfl(int fd, int flag);
 #endif
 
 bool qemu_has_direct_io(void);
diff --git a/block/file-posix.c b/block/file-posix.c
index 6265d2e248..e49b13d6ab 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1056,21 +1056,6 @@ static int raw_handle_perm_lock(BlockDriverState *bs,
     return ret;
 }
 
-/* Sets a specific flag */
-static int fcntl_setfl(int fd, int flag)
-{
-    int flags;
-
-    flags = fcntl(fd, F_GETFL);
-    if (flags == -1) {
-        return -errno;
-    }
-    if (fcntl(fd, F_SETFL, flags | flag) == -1) {
-        return -errno;
-    }
-    return 0;
-}
-
 static int raw_reconfigure_getfd(BlockDriverState *bs, int flags,
                                  int *open_flags, uint64_t perm, Error **errp)
 {
@@ -1109,7 +1094,7 @@ static int raw_reconfigure_getfd(BlockDriverState *bs, int flags,
         /* dup the original fd */
         fd = qemu_dup(s->fd);
         if (fd >= 0) {
-            ret = fcntl_setfl(fd, *open_flags);
+            ret = qemu_fcntl_addfl(fd, *open_flags);
             if (ret) {
                 qemu_close(fd);
                 fd = -1;
diff --git a/util/osdep.c b/util/osdep.c
index 770369831b..000e7daac8 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -280,6 +280,24 @@ int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive)
         return fl.l_type == F_UNLCK ? 0 : -EAGAIN;
     }
 }
+
+/**
+ * Set the given flag(s) (fcntl GETFL/SETFL) on the given FD, while retaining
+ * other flags.
+ */
+int qemu_fcntl_addfl(int fd, int flag)
+{
+    int flags;
+
+    flags = fcntl(fd, F_GETFL);
+    if (flags == -1) {
+        return -errno;
+    }
+    if (fcntl(fd, F_SETFL, flags | flag) == -1) {
+        return -errno;
+    }
+    return 0;
+}
 #endif
 
 bool qemu_has_direct_io(void)
-- 
2.53.0