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

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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: David Howells <dhowells@redhat.com>
Reviewed-by: Steve Dickson <steved@redhat.com>
Acked-by: Jeff Layton <jeff.layton@primarydata.com>
This commit is contained in:
David Howells 2015-02-25 11:53:57 +00:00
parent 30ceec6284
commit 6515d1dbf4
2 changed files with 8 additions and 0 deletions
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2
fs/fscache/object.c
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@ -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))

6
fs/fscache/operation.c
View File

@ -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));