Commit 6515d1db authored by David Howells's avatar David Howells
Browse files

FS-Cache: Handle a new operation submitted against a killed object 



Reject new operations that are being submitted against an object if that
object has failed its lookup or creation states or has been killed by the
cache backend for some other reason, such as having been culled.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarSteve Dickson <steved@redhat.com>
Acked-by: default avatarJeff Layton <jeff.layton@primarydata.com>
parent 30ceec62

fs/fscache/object.c

+2 −0
Original line number Diff line number Diff line
@@ -610,6 +610,8 @@ static const struct fscache_state *fscache_lookup_failure(struct fscache_object 
	object->cache->ops->lookup_complete(object);

	fscache_stat_d(&fscache_n_cop_lookup_complete);



	set_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->flags);



	cookie = object->cookie;

	set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);

	if (test_and_clear_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags))

fs/fscache/operation.c

+6 −0
Original line number Diff line number Diff line
@@ -176,6 +176,9 @@ int fscache_submit_exclusive_op(struct fscache_object *object, 
		list_add_tail(&op->pend_link, &object->pending_ops);

		fscache_stat(&fscache_n_op_pend);

		ret = 0;

	} else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {

		op->state = FSCACHE_OP_ST_CANCELLED;

		ret = -ENOBUFS;

	} else {

		fscache_report_unexpected_submission(object, op, ostate);

		op->state = FSCACHE_OP_ST_CANCELLED;
@@ -249,6 +252,9 @@ int fscache_submit_op(struct fscache_object *object, 
		list_add_tail(&op->pend_link, &object->pending_ops);

		fscache_stat(&fscache_n_op_pend);

		ret = 0;

	} else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {

		op->state = FSCACHE_OP_ST_CANCELLED;

		ret = -ENOBUFS;

	} else {

		fscache_report_unexpected_submission(object, op, ostate);

		ASSERT(!fscache_object_is_active(object));

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