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FS-Cache: Wrap checks on object state

Browse source 
Wrap checks on object state (mostly outside of fs/fscache/object.c) with
inline functions so that the mechanism can be replaced.

Some of the state checks within object.c are left as-is as they will be
replaced.

Signed-off-by: David Howells <[email protected]>
Tested-By: Milosz Tanski <[email protected]>
Acked-by: Jeff Layton <[email protected]>
This commit is contained in:
David Howells 2013-05-10 19:50:26 +01:00
commit 493f7bc114
6 changed files with 40 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/fscache/cache.c
View file

@ -115,7 +115,7 @@ struct fscache_cache *fscache_select_cache_for_object(
struct fscache_object, cookie_link);
cache = object->cache;
if (object->state >= FSCACHE_OBJECT_DYING ||
if (fscache_object_is_dying(object) ||
test_bit(FSCACHE_IOERROR, &cache->flags))
cache = NULL;

8
fs/fscache/cookie.c
View file

@ -285,7 +285,7 @@ static int fscache_alloc_object(struct fscache_cache *cache,
object_already_extant:
ret = -ENOBUFS;
if (object->state >= FSCACHE_OBJECT_DYING) {
if (fscache_object_is_dead(object)) {
spin_unlock(&cookie->lock);
goto error;
}
@ -321,7 +321,7 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
ret = -EEXIST;
hlist_for_each_entry(p, &cookie->backing_objects, cookie_link) {
if (p->cache == object->cache) {
if (p->state >= FSCACHE_OBJECT_DYING)
if (fscache_object_is_dying(p))
ret = -ENOBUFS;
goto cant_attach_object;
}
@ -332,7 +332,7 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
hlist_for_each_entry(p, &cookie->parent->backing_objects,
cookie_link) {
if (p->cache == object->cache) {
if (p->state >= FSCACHE_OBJECT_DYING) {
if (fscache_object_is_dying(p)) {
ret = -ENOBUFS;
spin_unlock(&cookie->parent->lock);
goto cant_attach_object;
@ -400,7 +400,7 @@ void __fscache_invalidate(struct fscache_cookie *cookie)
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object,
cookie_link);
if (object->state < FSCACHE_OBJECT_DYING)
if (fscache_object_is_live(object))
fscache_raise_event(
object, FSCACHE_OBJECT_EV_INVALIDATE);
}

8
fs/fscache/object.c
View file

@ -457,10 +457,10 @@ static void fscache_initialise_object(struct fscache_object *object)
spin_lock_nested(&parent->lock, 1);
_debug("parent %s", fscache_object_states[parent->state]);
if (parent->state >= FSCACHE_OBJECT_DYING) {
if (fscache_object_is_dying(parent)) {
_debug("bad parent");
set_bit(FSCACHE_OBJECT_EV_WITHDRAW, &object->events);
} else if (parent->state < FSCACHE_OBJECT_AVAILABLE) {
} else if (!fscache_object_is_available(parent)) {
_debug("wait");
/* we may get woken up in this state by child objects
@ -517,9 +517,9 @@ static void fscache_lookup_object(struct fscache_object *object)
ASSERTCMP(parent->n_obj_ops, >, 0);
/* make sure the parent is still available */
ASSERTCMP(parent->state, >=, FSCACHE_OBJECT_AVAILABLE);
ASSERT(fscache_object_is_available(parent));
if (parent->state >= FSCACHE_OBJECT_DYING ||
if (fscache_object_is_dying(parent) ||
test_bit(FSCACHE_IOERROR, &object->cache->flags)) {
_debug("unavailable");
set_bit(FSCACHE_OBJECT_EV_WITHDRAW, &object->events);

2
fs/fscache/operation.c
View file

@ -35,7 +35,7 @@ void fscache_enqueue_operation(struct fscache_operation *op)
ASSERT(list_empty(&op->pend_link));
ASSERT(op->processor != NULL);
ASSERTCMP(op->object->state, >=, FSCACHE_OBJECT_AVAILABLE);
ASSERT(fscache_object_is_available(op->object));
ASSERTCMP(atomic_read(&op->usage), >, 0);
ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS);