85 lines
2.7 KiB
Diff
85 lines
2.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Fiona Ebner <f.ebner@proxmox.com>
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Date: Wed, 27 Mar 2024 11:15:39 +0100
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Subject: [PATCH] alloc-track: avoid seemingly superfluous child permission
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update
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Doesn't seem necessary nowadays (maybe after commit "alloc-track: fix
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deadlock during drop" where the dropping is not rescheduled and delayed
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anymore or some upstream change). Should there really be some issue,
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instead of having a drop state, this could also be just based off the
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fact whether there is still a backing child.
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Dumping the cumulative (shared) permissions for the BDS with a debug
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print yields the same values after this patch and with QEMU 8.1,
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namely 3 and 5.
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Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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---
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block/alloc-track.c | 26 --------------------------
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1 file changed, 26 deletions(-)
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diff --git a/block/alloc-track.c b/block/alloc-track.c
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index f3ed2935c4..29138dcc49 100644
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--- a/block/alloc-track.c
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+++ b/block/alloc-track.c
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@@ -25,15 +25,9 @@
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#define TRACK_OPT_AUTO_REMOVE "auto-remove"
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-typedef enum DropState {
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- DropNone,
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- DropInProgress,
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-} DropState;
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-
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typedef struct {
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BdrvDirtyBitmap *bitmap;
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uint64_t granularity;
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- DropState drop_state;
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} BDRVAllocTrackState;
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static QemuOptsList runtime_opts = {
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@@ -137,8 +131,6 @@ static int track_open(BlockDriverState *bs, QDict *options, int flags,
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goto fail;
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}
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- s->drop_state = DropNone;
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-
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fail:
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if (ret < 0) {
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bdrv_graph_wrlock();
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@@ -289,18 +281,8 @@ track_child_perm(BlockDriverState *bs, BdrvChild *c, BdrvChildRole role,
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BlockReopenQueue *reopen_queue, uint64_t perm, uint64_t shared,
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uint64_t *nperm, uint64_t *nshared)
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{
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- BDRVAllocTrackState *s = bs->opaque;
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-
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*nshared = BLK_PERM_ALL;
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- /* in case we're currently dropping ourselves, claim to not use any
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- * permissions at all - which is fine, since from this point on we will
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- * never issue a read or write anymore */
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- if (s->drop_state == DropInProgress) {
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- *nperm = 0;
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- return;
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- }
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-
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if (role & BDRV_CHILD_DATA) {
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*nperm = perm & DEFAULT_PERM_PASSTHROUGH;
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} else {
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@@ -326,14 +308,6 @@ track_co_change_backing_file(BlockDriverState *bs, const char *backing_file,
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* kinda fits better, but in the long-term, a special parameter would be
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* nice (or done via qemu-server via upcoming blockdev-replace QMP command).
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*/
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- if (backing_file == NULL) {
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- BDRVAllocTrackState *s = bs->opaque;
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- bdrv_drained_begin(bs);
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- s->drop_state = DropInProgress;
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- bdrv_child_refresh_perms(bs, bs->file, &error_abort);
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- bdrv_drained_end(bs);
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- }
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-
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return 0;
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}
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