Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- auto-read-only option to fix commit job when used with -blockdev
- Fix help text related qemu-iotests failure (by improving the help text
  and updating the reference output)
- quorum: Add missing checks when adding/removing child nodes
- Don't take address of fields in packed structs
- vvfat: Fix crash when reporting error about too many files in directory

# gpg: Signature made Mon 05 Nov 2018 15:35:25 GMT
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream: (36 commits)
  include: Add a comment to explain the origin of sizes' lookup table
  vdi: Use a literal number of bytes for DEFAULT_CLUSTER_SIZE
  fw_cfg: Drop newline in @file description
  object: Make option help nicer to read
  qdev-monitor: Make device options help nicer
  chardev: Indent list of chardevs
  option: Make option help nicer to read
  qemu-iotests: Test auto-read-only with -drive and -blockdev
  block: Make auto-read-only=on default for -drive
  iscsi: Support auto-read-only option
  gluster: Support auto-read-only option
  curl: Support auto-read-only option
  file-posix: Support auto-read-only option
  nbd: Support auto-read-only option
  block: Require auto-read-only for existing fallbacks
  rbd: Close image in qemu_rbd_open() error path
  block: Add auto-read-only option
  block: Update flags in bdrv_set_read_only()
  iotest: Test x-blockdev-change on a Quorum
  quorum: Forbid adding children in blkverify mode
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 26 insertions, 5 deletions

diff --git a/include/block/block.h b/include/block/block.h
index b189cf422e..7f5453b45b 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -115,6 +115,7 @@ typedef struct HDGeometry {
                                       select an appropriate protocol driver,
                                       ignoring the format layer */
 #define BDRV_O_NO_IO       0x10000 /* don't initialize for I/O */
+#define BDRV_O_AUTO_RDONLY 0x20000 /* degrade to read-only if opening read-write fails */
 
 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
 
@@ -125,6 +126,7 @@ typedef struct HDGeometry {
 #define BDRV_OPT_CACHE_DIRECT   "cache.direct"
 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
 #define BDRV_OPT_READ_ONLY      "read-only"
+#define BDRV_OPT_AUTO_READ_ONLY "auto-read-only"
 #define BDRV_OPT_DISCARD        "discard"
 #define BDRV_OPT_FORCE_SHARE    "force-share"
 
@@ -436,7 +438,8 @@ int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 bool bdrv_is_read_only(BlockDriverState *bs);
 int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only,
                            bool ignore_allow_rdw, Error **errp);
-int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp);
+int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg,
+                              Error **errp);
 bool bdrv_is_writable(BlockDriverState *bs);
 bool bdrv_is_sg(BlockDriverState *bs);
 bool bdrv_is_inserted(BlockDriverState *bs);
diff --git a/include/qemu/option.h b/include/qemu/option.h
index 3dfb4493cc..844587cab3 100644
--- a/include/qemu/option.h
+++ b/include/qemu/option.h
@@ -132,7 +132,7 @@ typedef int (*qemu_opts_loopfunc)(void *opaque, QemuOpts *opts, Error **errp);
 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
                       void *opaque, Error **errp);
 void qemu_opts_print(QemuOpts *opts, const char *sep);
-void qemu_opts_print_help(QemuOptsList *list);
+void qemu_opts_print_help(QemuOptsList *list, bool print_caption);
 void qemu_opts_free(QemuOptsList *list);
 QemuOptsList *qemu_opts_append(QemuOptsList *dst, QemuOptsList *list);
 
diff --git a/include/qemu/units.h b/include/qemu/units.h
index 68a7758650..1c959d182e 100644
--- a/include/qemu/units.h
+++ b/include/qemu/units.h
@@ -17,6 +17,24 @@
 #define PiB     (INT64_C(1) << 50)
 #define EiB     (INT64_C(1) << 60)
 
+/*
+ * The following lookup table is intended to be used when a literal string of
+ * the number of bytes is required (for example if it needs to be stringified).
+ * It can also be used for generic shortcuts of power-of-two sizes.
+ * This table is generated using the AWK script below:
+ *
+ *  BEGIN {
+ *      suffix="KMGTPE";
+ *      for(i=10; i<64; i++) {
+ *          val=2**i;
+ *          s=substr(suffix, int(i/10), 1);
+ *          n=2**(i%10);
+ *          pad=21-int(log(n)/log(10));
+ *          printf("#define S_%d%siB %*d\n", n, s, pad, val);
+ *      }
+ *  }
+ */
+
 #define S_1KiB                  1024
 #define S_2KiB                  2048
 #define S_4KiB                  4096
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 830d873f24..c96bcdee14 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -166,9 +166,9 @@ BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
                                       int error);
 void blk_error_action(BlockBackend *blk, BlockErrorAction action,
                       bool is_read, int error);
-int blk_is_read_only(BlockBackend *blk);
-int blk_is_sg(BlockBackend *blk);
-int blk_enable_write_cache(BlockBackend *blk);
+bool blk_is_read_only(BlockBackend *blk);
+bool blk_is_sg(BlockBackend *blk);
+bool blk_enable_write_cache(BlockBackend *blk);
 void blk_set_enable_write_cache(BlockBackend *blk, bool wce);
 void blk_invalidate_cache(BlockBackend *blk, Error **errp);
 bool blk_is_inserted(BlockBackend *blk);