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nbd: Switch from close to eject notifier

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The NBD code uses the BDS close notifier to determine when a medium is
ejected. However, now it should use the BB's BDS removal notifier for
that instead of the BDS's close notifier.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-01-29 16:36:06 +01:00
parent 5b9e0e4693
commit 741cc43133
2 changed files with 18 additions and 35 deletions
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40
blockdev-nbd.c
View File

@ -45,37 +45,11 @@ void qmp_nbd_server_start(SocketAddress *addr, Error **errp)
}
}
/*
* Hook into the BlockBackend notifiers to close the export when the
* backend is closed.
*/
typedef struct NBDCloseNotifier {
Notifier n;
NBDExport *exp;
QTAILQ_ENTRY(NBDCloseNotifier) next;
} NBDCloseNotifier;
static QTAILQ_HEAD(, NBDCloseNotifier) close_notifiers =
QTAILQ_HEAD_INITIALIZER(close_notifiers);
static void nbd_close_notifier(Notifier *n, void *data)
{
NBDCloseNotifier *cn = DO_UPCAST(NBDCloseNotifier, n, n);
notifier_remove(&cn->n);
QTAILQ_REMOVE(&close_notifiers, cn, next);
nbd_export_close(cn->exp);
nbd_export_put(cn->exp);
g_free(cn);
}
void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
Error **errp)
{
BlockBackend *blk;
NBDExport *exp;
NBDCloseNotifier *n;
if (server_fd == -1) {
error_setg(errp, "NBD server not running");
@ -113,19 +87,15 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
nbd_export_set_name(exp, device);
n = g_new0(NBDCloseNotifier, 1);
n->n.notify = nbd_close_notifier;
n->exp = exp;
blk_add_close_notifier(blk, &n->n);
QTAILQ_INSERT_TAIL(&close_notifiers, n, next);
/* The list of named exports has a strong reference to this export now and
* our only way of accessing it is through nbd_export_find(), so we can drop
* the strong reference that is @exp. */
nbd_export_put(exp);
}
void qmp_nbd_server_stop(Error **errp)
{
while (!QTAILQ_EMPTY(&close_notifiers)) {
NBDCloseNotifier *cn = QTAILQ_FIRST(&close_notifiers);
nbd_close_notifier(&cn->n, nbd_export_get_blockdev(cn->exp));
}
nbd_export_close_all();
if (server_fd != -1) {
qemu_set_fd_handler(server_fd, NULL, NULL, NULL);

13
nbd/server.c
View File

@ -64,6 +64,8 @@ struct NBDExport {
QTAILQ_ENTRY(NBDExport) next;
AioContext *ctx;
Notifier eject_notifier;
};
static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
@ -644,6 +646,12 @@ static void blk_aio_detach(void *opaque)
exp->ctx = NULL;
}
static void nbd_eject_notifier(Notifier *n, void *data)
{
NBDExport *exp = container_of(n, NBDExport, eject_notifier);
nbd_export_close(exp);
}
NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size,
uint32_t nbdflags, void (*close)(NBDExport *),
Error **errp)
@ -666,6 +674,10 @@ NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size,
exp->ctx = blk_get_aio_context(blk);
blk_ref(blk);
blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp);
exp->eject_notifier.notify = nbd_eject_notifier;
blk_add_remove_bs_notifier(blk, &exp->eject_notifier);
/*
* NBD exports are used for non-shared storage migration. Make sure
* that BDRV_O_INACTIVE is cleared and the image is ready for write
@ -747,6 +759,7 @@ void nbd_export_put(NBDExport *exp)
}
if (exp->blk) {
notifier_remove(&exp->eject_notifier);
blk_remove_aio_context_notifier(exp->blk, blk_aio_attached,
blk_aio_detach, exp);
blk_unref(exp->blk);