[Qemu-block] [PATCH v4 10/25] block: Add bdrv_dirname()

[Max Reitz]

This function may be implemented by block drivers to derive a directory
name from a BDS. Concatenating this g_free()-able string with a relative
filename must result in a valid (not necessarily existing) filename, so
this is a function that should generally be not implemented by format
drivers, because this is protocol-specific.

If a BDS's driver does not implement this function, bdrv_dirname() will
fall through to the BDS's file if it exists. If it does not, the
exact_filename field will be used to generate a directory name.

Signed-off-by: Max Reitz <address@hidden>
---
 include/block/block.h     |  1 +
 include/block/block_int.h |  1 +
 block.c                   | 26 ++++++++++++++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/include/block/block.h b/include/block/block.h
index eb41956bf1..7bcbd05338 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -439,6 +439,7 @@ char *bdrv_get_full_backing_filename(BlockDriverState *bs, 
Error **errp);
 char *bdrv_get_full_backing_filename_from_filename(const char *backed,
                                                    const char *backing,
                                                    Error **errp);
+char *bdrv_dirname(BlockDriverState *bs, Error **errp);
 
 int path_has_protocol(const char *path);
 int path_is_absolute(const char *path);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index c1f057ab47..fb916a7890 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -130,6 +130,7 @@ struct BlockDriver {
     int (*bdrv_make_empty)(BlockDriverState *bs);
 
     void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
+    char *(*bdrv_dirname)(BlockDriverState *bs, Error **errp);
 
     /* aio */
     BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
diff --git a/block.c b/block.c
index 2735ec4bcc..e591e326c5 100644
--- a/block.c
+++ b/block.c
@@ -4083,6 +4083,32 @@ void bdrv_refresh_filename(BlockDriverState *bs)
     }
 }
 
+char *bdrv_dirname(BlockDriverState *bs, Error **errp)
+{
+    BlockDriver *drv = bs->drv;
+
+    if (!drv) {
+        error_setg(errp, "Node '%s' is ejected", bs->node_name);
+        return NULL;
+    }
+
+    if (drv->bdrv_dirname) {
+        return drv->bdrv_dirname(bs, errp);
+    }
+
+    if (bs->file) {
+        return bdrv_dirname(bs->file->bs, errp);
+    }
+
+    if (bs->exact_filename[0] != '\0') {
+        return path_combine(bs->exact_filename, "");
+    }
+
+    error_setg(errp, "Cannot generate a base directory for %s nodes",
+               drv->format_name);
+    return NULL;
+}
+
 /*
  * Hot add/remove a BDS's child. So the user can take a child offline when
  * it is broken and take a new child online
-- 
2.11.0