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authorPeter Maydell <peter.maydell@linaro.org>2021-06-02 19:34:03 +0100
committerPeter Maydell <peter.maydell@linaro.org>2021-06-02 19:34:03 +0100
commit8e6dad2028d01b7f9ec76cf3b83457fab57fa1eb (patch)
treeac09be5943257532c1ea60ed028f501fd76d8eab /nbd
parent8c345b3e6a736d4985b2bca6f7f24b985900de63 (diff)
parentb317006a3f1f04191a7981cef83417cb2477213b (diff)
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer patches - NBD server: Fix crashes related to switching between AioContexts - file-posix: Workaround for discard/write_zeroes on buggy filesystems - Follow-up fixes for the reopen vs. permission changes - quorum: Fix error handling for flush - block-copy: Refactor copy_range handling - docs: Describe how to use 'null-co' block driver # gpg: Signature made Wed 02 Jun 2021 14:44:15 BST # gpg: using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6 # gpg: issuer "kwolf@redhat.com" # gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full] # Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6 * remotes/kevin/tags/for-upstream: docs/secure-coding-practices: Describe how to use 'null-co' block driver block-copy: refactor copy_range handling block-copy: fix block_copy_task_entry() progress update nbd/server: Use drained block ops to quiesce the server block-backend: add drained_poll block: improve permission conflict error message block: simplify bdrv_child_user_desc() block/vvfat: inherit child_vvfat_qcow from child_of_bds block: improve bdrv_child_get_parent_desc() block-backend: improve blk_root_get_parent_desc() block: document child argument of bdrv_attach_child_common() block/file-posix: Try other fallbacks after invalid FALLOC_FL_ZERO_RANGE block/file-posix: Fix problem with fallocate(PUNCH_HOLE) on GPFS block: drop BlockBackendRootState::read_only block: drop BlockDriverState::read_only block: consistently use bdrv_is_read_only() block/vvfat: fix vvfat_child_perm crash block/vvfat: child_vvfat_qcow: add .get_parent_aio_context, fix crash qemu-io-cmds: assert that we don't have .perm requested in no-blk case block/quorum: Provide .bdrv_co_flush instead of .bdrv_co_flush_to_disk Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'nbd')
-rw-r--r--nbd/server.c82
1 files changed, 61 insertions, 21 deletions
diff --git a/nbd/server.c b/nbd/server.c
index 86a44a9..b60ebc3 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1513,6 +1513,11 @@ static void nbd_request_put(NBDRequestData *req)
g_free(req);
client->nb_requests--;
+
+ if (client->quiescing && client->nb_requests == 0) {
+ aio_wait_kick();
+ }
+
nbd_client_receive_next_request(client);
nbd_client_put(client);
@@ -1530,49 +1535,68 @@ static void blk_aio_attached(AioContext *ctx, void *opaque)
QTAILQ_FOREACH(client, &exp->clients, next) {
qio_channel_attach_aio_context(client->ioc, ctx);
+ assert(client->nb_requests == 0);
assert(client->recv_coroutine == NULL);
assert(client->send_coroutine == NULL);
-
- if (client->quiescing) {
- client->quiescing = false;
- nbd_client_receive_next_request(client);
- }
}
}
-static void nbd_aio_detach_bh(void *opaque)
+static void blk_aio_detach(void *opaque)
{
NBDExport *exp = opaque;
NBDClient *client;
+ trace_nbd_blk_aio_detach(exp->name, exp->common.ctx);
+
QTAILQ_FOREACH(client, &exp->clients, next) {
qio_channel_detach_aio_context(client->ioc);
+ }
+
+ exp->common.ctx = NULL;
+}
+
+static void nbd_drained_begin(void *opaque)
+{
+ NBDExport *exp = opaque;
+ NBDClient *client;
+
+ QTAILQ_FOREACH(client, &exp->clients, next) {
client->quiescing = true;
+ }
+}
- if (client->recv_coroutine) {
- if (client->read_yielding) {
- qemu_aio_coroutine_enter(exp->common.ctx,
- client->recv_coroutine);
- } else {
- AIO_WAIT_WHILE(exp->common.ctx, client->recv_coroutine != NULL);
- }
- }
+static void nbd_drained_end(void *opaque)
+{
+ NBDExport *exp = opaque;
+ NBDClient *client;
- if (client->send_coroutine) {
- AIO_WAIT_WHILE(exp->common.ctx, client->send_coroutine != NULL);
- }
+ QTAILQ_FOREACH(client, &exp->clients, next) {
+ client->quiescing = false;
+ nbd_client_receive_next_request(client);
}
}
-static void blk_aio_detach(void *opaque)
+static bool nbd_drained_poll(void *opaque)
{
NBDExport *exp = opaque;
+ NBDClient *client;
- trace_nbd_blk_aio_detach(exp->name, exp->common.ctx);
+ QTAILQ_FOREACH(client, &exp->clients, next) {
+ if (client->nb_requests != 0) {
+ /*
+ * If there's a coroutine waiting for a request on nbd_read_eof()
+ * enter it here so we don't depend on the client to wake it up.
+ */
+ if (client->recv_coroutine != NULL && client->read_yielding) {
+ qemu_aio_coroutine_enter(exp->common.ctx,
+ client->recv_coroutine);
+ }
- aio_wait_bh_oneshot(exp->common.ctx, nbd_aio_detach_bh, exp);
+ return true;
+ }
+ }
- exp->common.ctx = NULL;
+ return false;
}
static void nbd_eject_notifier(Notifier *n, void *data)
@@ -1594,6 +1618,12 @@ void nbd_export_set_on_eject_blk(BlockExport *exp, BlockBackend *blk)
blk_add_remove_bs_notifier(blk, &nbd_exp->eject_notifier);
}
+static const BlockDevOps nbd_block_ops = {
+ .drained_begin = nbd_drained_begin,
+ .drained_end = nbd_drained_end,
+ .drained_poll = nbd_drained_poll,
+};
+
static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args,
Error **errp)
{
@@ -1715,8 +1745,17 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args,
exp->allocation_depth = arg->allocation_depth;
+ /*
+ * We need to inhibit request queuing in the block layer to ensure we can
+ * be properly quiesced when entering a drained section, as our coroutines
+ * servicing pending requests might enter blk_pread().
+ */
+ blk_set_disable_request_queuing(blk, true);
+
blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp);
+ blk_set_dev_ops(blk, &nbd_block_ops, exp);
+
QTAILQ_INSERT_TAIL(&exports, exp, next);
return 0;
@@ -1788,6 +1827,7 @@ static void nbd_export_delete(BlockExport *blk_exp)
}
blk_remove_aio_context_notifier(exp->common.blk, blk_aio_attached,
blk_aio_detach, exp);
+ blk_set_disable_request_queuing(exp->common.blk, false);
}
for (i = 0; i < exp->nr_export_bitmaps; i++) {