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[Qemu-devel] [PATCH v3 11/14] block: Add blk_next_root_bs()
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH v3 11/14] block: Add blk_next_root_bs() |
Date: |
Tue, 16 Feb 2016 19:08:23 +0100 |
This function iterates over all BDSs attached to a BB. We are going to
need it when rewriting bdrv_next() so it no longer uses bdrv_states.
Signed-off-by: Max Reitz <address@hidden>
---
block/block-backend.c | 24 ++++++++++++++++++++++++
include/sysemu/block-backend.h | 1 +
2 files changed, 25 insertions(+)
diff --git a/block/block-backend.c b/block/block-backend.c
index a918c35..d1621ec 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -269,6 +269,30 @@ BlockBackend *blk_next(BlockBackend *blk)
}
/*
+ * Iterates over all BlockDriverStates which are attached to a BlockBackend.
+ * This function is for use by bdrv_next().
+ *
+ * @bs must be NULL or a BDS that is attached to a BB.
+ */
+BlockDriverState *blk_next_root_bs(BlockDriverState *bs)
+{
+ BlockBackend *blk;
+
+ if (bs) {
+ assert(bs->blk);
+ blk = bs->blk;
+ } else {
+ blk = NULL;
+ }
+
+ do {
+ blk = blk_all_next(blk);
+ } while (blk && !blk->bs);
+
+ return blk ? blk->bs : NULL;
+}
+
+/*
* Add a BlockBackend into the list of backends referenced by the monitor.
* Strictly for use by blockdev.c.
*/
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 3a47982..5ac9bd2 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -73,6 +73,7 @@ const char *blk_name(BlockBackend *blk);
BlockBackend *blk_by_name(const char *name);
bool blk_name_taken(const char *name);
BlockBackend *blk_next(BlockBackend *blk);
+BlockDriverState *blk_next_root_bs(BlockDriverState *bs);
void monitor_add_blk(BlockBackend *blk);
void monitor_remove_blk(BlockBackend *blk);
--
2.7.1
- [Qemu-devel] [PATCH v3 08/14] blockdev: Remove blk_hide_on_behalf_of_hmp_drive_del(), (continued)
- [Qemu-devel] [PATCH v3 08/14] blockdev: Remove blk_hide_on_behalf_of_hmp_drive_del(), Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 05/14] block: Add blk_commit_all(), Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 09/14] block: Move some bdrv_*_all() functions to BB, Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 07/14] blockdev: Add list of monitor-owned BlockBackends, Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 10/14] block: Add bdrv_next_monitor_owned(), Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 11/14] block: Add blk_next_root_bs(),
Max Reitz <=
- [Qemu-devel] [PATCH v3 12/14] block: Rewrite bdrv_next(), Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 13/14] block: Use bdrv_next() instead of bdrv_states, Max Reitz, 2016/02/16
- [Qemu-devel] [PATCH v3 14/14] block: Remove bdrv_states list, Max Reitz, 2016/02/16
- Re: [Qemu-devel] [PATCH v3 00/14] blockdev: Further BlockBackend work, Kevin Wolf, 2016/02/17