From: Emanuele Giuseppe Esposito <eesposit@redhat.com>
To: qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
Emanuele Giuseppe Esposito <eesposit@redhat.com>,
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>, John Snow <jsnow@redhat.com>
Subject: [PATCH v2 5/7] block-copy: add QemuMutex lock for BlockCopyCallState list
Date: Tue, 18 May 2021 12:07:55 +0200 [thread overview]
Message-ID: <20210518100757.31243-6-eesposit@redhat.com> (raw)
In-Reply-To: <20210518100757.31243-1-eesposit@redhat.com>
As for BlockCopyTask, add a lock to protect BlockCopyCallState
ret and sleep_state fields. Also move ret, finished and cancelled
in the OUT fields of BlockCopyCallState.
Here a QemuMutex is used to protect QemuCoSleep field, since it
can be concurrently invoked also from outside threads.
.finished, .cancelled and reads to .ret and .error_is_read will be
protected in the following patch.
.sleep state is handled in the series "coroutine: new sleep/wake API"
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
block/block-copy.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/block/block-copy.c b/block/block-copy.c
index 3a949fab64..d5ed5932b0 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -55,13 +55,14 @@ typedef struct BlockCopyCallState {
QLIST_ENTRY(BlockCopyCallState) list;
/* State */
- int ret;
bool finished;
- QemuCoSleep sleep;
- bool cancelled;
+ QemuCoSleep sleep; /* TODO: protect API with a lock */
/* OUT parameters */
+ bool cancelled;
+ /* Fields protected by calls_lock in BlockCopyState */
bool error_is_read;
+ int ret;
} BlockCopyCallState;
typedef struct BlockCopyTask {
@@ -110,6 +111,7 @@ typedef struct BlockCopyState {
BlockCopyMethod method;
CoMutex tasks_lock;
QLIST_HEAD(, BlockCopyTask) tasks; /* All tasks from all block-copy calls */
+ QemuMutex calls_lock;
QLIST_HEAD(, BlockCopyCallState) calls;
/* State fields that use a thread-safe API */
BdrvDirtyBitmap *copy_bitmap;
@@ -289,6 +291,7 @@ void block_copy_state_free(BlockCopyState *s)
}
ratelimit_destroy(&s->rate_limit);
+ qemu_mutex_destroy(&s->calls_lock);
bdrv_release_dirty_bitmap(s->copy_bitmap);
shres_destroy(s->mem);
g_free(s);
@@ -349,6 +352,7 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
ratelimit_init(&s->rate_limit);
qemu_co_mutex_init(&s->tasks_lock);
+ qemu_mutex_init(&s->calls_lock);
QLIST_INIT(&s->tasks);
QLIST_INIT(&s->calls);
@@ -492,11 +496,14 @@ static coroutine_fn int block_copy_task_entry(AioTask *task)
ret = block_copy_do_copy(t->s, t->offset, t->bytes, t->zeroes,
&error_is_read);
- if (ret < 0 && !t->call_state->ret) {
- t->call_state->ret = ret;
- t->call_state->error_is_read = error_is_read;
- } else {
- progress_work_done(t->s->progress, t->bytes);
+
+ WITH_QEMU_LOCK_GUARD(&t->s->calls_lock) {
+ if (ret < 0 && !t->call_state->ret) {
+ t->call_state->ret = ret;
+ t->call_state->error_is_read = error_is_read;
+ } else {
+ progress_work_done(t->s->progress, t->bytes);
+ }
}
co_put_to_shres(t->s->mem, t->bytes);
block_copy_task_end(t, ret);
@@ -740,7 +747,9 @@ static int coroutine_fn block_copy_common(BlockCopyCallState *call_state)
{
int ret;
+ qemu_mutex_lock(&call_state->s->calls_lock);
QLIST_INSERT_HEAD(&call_state->s->calls, call_state, list);
+ qemu_mutex_unlock(&call_state->s->calls_lock);
do {
ret = block_copy_dirty_clusters(call_state);
@@ -767,7 +776,9 @@ static int coroutine_fn block_copy_common(BlockCopyCallState *call_state)
call_state->cb(call_state->cb_opaque);
}
+ qemu_mutex_lock(&call_state->s->calls_lock);
QLIST_REMOVE(call_state, list);
+ qemu_mutex_unlock(&call_state->s->calls_lock);
return ret;
}
--
2.30.2
next prev parent reply other threads:[~2021-05-18 10:43 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-18 10:07 [PATCH v2 0/7] block-copy: protect block-copy internal structures Emanuele Giuseppe Esposito
2021-05-18 10:07 ` [PATCH v2 1/7] block-copy: streamline choice of copy_range vs. read/write Emanuele Giuseppe Esposito
2021-05-20 14:42 ` Vladimir Sementsov-Ogievskiy
2021-05-20 15:06 ` Emanuele Giuseppe Esposito
2021-05-20 15:24 ` Vladimir Sementsov-Ogievskiy
2021-05-21 15:10 ` Paolo Bonzini
2021-05-21 15:48 ` Vladimir Sementsov-Ogievskiy
2021-05-21 16:43 ` Paolo Bonzini
2021-05-21 17:51 ` Vladimir Sementsov-Ogievskiy
2021-05-27 8:20 ` Stefan Hajnoczi
2021-05-27 19:04 ` Paolo Bonzini
2021-05-18 10:07 ` [PATCH v2 2/7] block-copy: improve documentation of BlockCopyTask and BlockCopyState types and functions Emanuele Giuseppe Esposito
2021-05-20 15:00 ` Vladimir Sementsov-Ogievskiy
2021-05-20 15:15 ` Emanuele Giuseppe Esposito
2021-05-18 10:07 ` [PATCH v2 3/7] block-copy: move progress_set_remaining in block_copy_task_end Emanuele Giuseppe Esposito
2021-05-20 15:03 ` Vladimir Sementsov-Ogievskiy
2021-05-18 10:07 ` [PATCH v2 4/7] block-copy: add a CoMutex to the BlockCopyTask list Emanuele Giuseppe Esposito
2021-05-20 15:19 ` Vladimir Sementsov-Ogievskiy
2021-05-25 10:07 ` Emanuele Giuseppe Esposito
2021-05-25 10:25 ` Vladimir Sementsov-Ogievskiy
2021-05-26 14:58 ` Paolo Bonzini
2021-05-26 16:13 ` Vladimir Sementsov-Ogievskiy
2021-05-27 9:07 ` Stefan Hajnoczi
2021-05-18 10:07 ` Emanuele Giuseppe Esposito [this message]
2021-05-20 15:30 ` [PATCH v2 5/7] block-copy: add QemuMutex lock for BlockCopyCallState list Vladimir Sementsov-Ogievskiy
2021-05-21 15:01 ` Paolo Bonzini
2021-05-25 10:58 ` Emanuele Giuseppe Esposito
2021-05-26 14:49 ` Paolo Bonzini
2021-05-28 10:53 ` Paolo Bonzini
2021-05-18 10:07 ` [PATCH v2 6/7] block-copy: atomic .cancelled and .finished fields in BlockCopyCallState Emanuele Giuseppe Esposito
2021-05-20 15:34 ` Vladimir Sementsov-Ogievskiy
2021-05-21 15:02 ` Paolo Bonzini
2021-05-21 15:53 ` Vladimir Sementsov-Ogievskiy
2021-05-21 15:56 ` Vladimir Sementsov-Ogievskiy
2021-05-21 16:47 ` Paolo Bonzini
2021-05-18 10:07 ` [PATCH v2 7/7] block-copy: protect BlockCopyState .method fields Emanuele Giuseppe Esposito
2021-05-21 17:10 ` Vladimir Sementsov-Ogievskiy
2021-05-25 10:18 ` Emanuele Giuseppe Esposito
2021-05-25 11:00 ` Vladimir Sementsov-Ogievskiy
2021-05-26 14:48 ` Paolo Bonzini
2021-05-26 17:18 ` Vladimir Sementsov-Ogievskiy
2021-05-28 10:24 ` Paolo Bonzini
2021-05-28 11:01 ` Paolo Bonzini
2021-05-28 11:52 ` Vladimir Sementsov-Ogievskiy
2021-05-28 12:44 ` Vladimir Sementsov-Ogievskiy
2021-05-20 13:47 ` [PATCH v2 0/7] block-copy: protect block-copy internal structures Vladimir Sementsov-Ogievskiy
2021-05-20 14:33 ` Emanuele Giuseppe Esposito
2021-05-27 10:31 ` Stefan Hajnoczi
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