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[Qemu-devel] [PATCH v3 08/14] blockdev: Remove blk_hide_on_behalf_of_hmp


From: Max Reitz
Subject: [Qemu-devel] [PATCH v3 08/14] blockdev: Remove blk_hide_on_behalf_of_hmp_drive_del()
Date: Tue, 16 Feb 2016 19:08:20 +0100

This function first removed the BlockBackend from the blk_backends list
and cleared its name so it would no longer be found by blk_name(); since
blk_next() now iterates through monitor_block_backends (which the BB is
removed from in hmp_drive_del()), this is no longer necessary.

Second, bdrv_make_anon() was called on the BDS. This was intended for
cases where the BDS was owned by that BB alone; in which case the BDS
will no longer exist at this point thanks to the blk_remove_bs() in
hmp_drive_del().

Therefore, this function does nothing useful anymore. Remove it.

Signed-off-by: Max Reitz <address@hidden>
---
 block/block-backend.c          | 25 ++-----------------------
 blockdev.c                     |  7 ++-----
 include/sysemu/block-backend.h |  2 --
 3 files changed, 4 insertions(+), 30 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 430d7d5..a10fe44 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -69,7 +69,7 @@ static const AIOCBInfo block_backend_aiocb_info = {
 
 static void drive_info_del(DriveInfo *dinfo);
 
-/* All the BlockBackends (except for hidden ones) */
+/* All the BlockBackends */
 static QTAILQ_HEAD(, BlockBackend) blk_backends =
     QTAILQ_HEAD_INITIALIZER(blk_backends);
 
@@ -181,10 +181,7 @@ static void blk_delete(BlockBackend *blk)
         g_free(blk->root_state.throttle_group);
         throttle_group_unref(blk->root_state.throttle_state);
     }
-    /* Avoid double-remove after blk_hide_on_behalf_of_hmp_drive_del() */
-    if (blk->name[0]) {
-        QTAILQ_REMOVE(&blk_backends, blk, link);
-    }
+    QTAILQ_REMOVE(&blk_backends, blk, link);
     g_free(blk->name);
     drive_info_del(blk->legacy_dinfo);
     block_acct_cleanup(&blk->stats);
@@ -400,24 +397,6 @@ BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo)
 }
 
 /*
- * Hide @blk.
- * @blk must not have been hidden already.
- * Make attached BlockDriverState, if any, anonymous.
- * Once hidden, @blk is invisible to all functions that don't receive
- * it as argument.  For example, blk_by_name() won't return it.
- * Strictly for use by do_drive_del().
- * TODO get rid of it!
- */
-void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk)
-{
-    QTAILQ_REMOVE(&blk_backends, blk, link);
-    blk->name[0] = 0;
-    if (blk->bs) {
-        bdrv_make_anon(blk->bs);
-    }
-}
-
-/*
  * Disassociates the currently associated BlockDriverState from @blk.
  */
 void blk_remove_bs(BlockBackend *blk)
diff --git a/blockdev.c b/blockdev.c
index ba1f648..6b929a9 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2818,13 +2818,10 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
 
     monitor_remove_blk(blk);
 
-    /* if we have a device attached to this BlockDriverState
-     * then we need to make the drive anonymous until the device
-     * can be removed.  If this is a drive with no device backing
-     * then we can just get rid of the block driver state right here.
+    /* If this BlockBackend has a device attached to it, its refcount will be
+     * decremented when the device is removed; otherwise we have to do so here.
      */
     if (blk_get_attached_dev(blk)) {
-        blk_hide_on_behalf_of_hmp_drive_del(blk);
         /* Further I/O must not pause the guest */
         blk_set_on_error(blk, BLOCKDEV_ON_ERROR_REPORT,
                          BLOCKDEV_ON_ERROR_REPORT);
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 078690a..3a47982 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -80,8 +80,6 @@ BlockDriverState *blk_bs(BlockBackend *blk);
 void blk_remove_bs(BlockBackend *blk);
 void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
 
-void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk);
-
 void blk_iostatus_enable(BlockBackend *blk);
 bool blk_iostatus_is_enabled(const BlockBackend *blk);
 BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk);
-- 
2.7.1




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