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[PATCH] block/file-posix: Use O_RDWR for locking on macOS


From: Akihiko Odaki
Subject: [PATCH] block/file-posix: Use O_RDWR for locking on macOS
Date: Wed, 7 Jul 2021 03:37:46 +0900

qemu_lock_fd_test always returns 0 when fd is not open for writing and
exclusive is true on macOS 11.3.1.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
---
 block/file-posix.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/block/file-posix.c b/block/file-posix.c
index b3fbb9bd63a..017fbc6b055 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -130,6 +130,14 @@
 #define RAW_LOCK_PERM_BASE             100
 #define RAW_LOCK_SHARED_BASE           200
 
+/*
+ * qemu_lock_fd_test always returns 0 when fd is not open for writing and
+ * exclusive is true on macOS 11.3.1.
+ */
+#ifdef __APPLE__
+#define RAW_LOCK_WRITES
+#endif
+
 typedef struct BDRVRawState {
     int fd;
     bool use_lock;
@@ -638,7 +646,11 @@ static int raw_open_common(BlockDriverState *bs, QDict 
*options,
                                                false);
 
     s->open_flags = open_flags;
+#ifdef RAW_LOCK_WRITES
+    raw_parse_flags(bdrv_flags, &s->open_flags, s->use_lock);
+#else
     raw_parse_flags(bdrv_flags, &s->open_flags, false);
+#endif
 
     s->fd = -1;
     fd = qemu_open(filename, s->open_flags, errp);
@@ -1004,6 +1016,11 @@ static int raw_reconfigure_getfd(BlockDriverState *bs, 
int flags,
     bool has_writers = perm &
         (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED | BLK_PERM_RESIZE);
     int fcntl_flags = O_APPEND | O_NONBLOCK;
+#ifdef RAW_LOCK_WRITES
+    if (s->use_lock) {
+        has_writers = true;
+    }
+#endif
 #ifdef O_NOATIME
     fcntl_flags |= O_NOATIME;
 #endif
-- 
2.30.1 (Apple Git-130)




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