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Message-ID: <20130510193347.3045.70304.stgit@warthog.procyon.org.uk>
Date: Fri, 10 May 2013 20:33:47 +0100
From: David Howells <dhowells@...hat.com>
To: Trond.Myklebust@...app.com, torvalds@...ux-foundation.org
Cc: linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-cachefs@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 6/8] FS-Cache: Wrap checks on object state [ver #2]
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 <dhowells@...hat.com>
---
fs/cachefiles/namei.c | 4 ++--
fs/fscache/cache.c | 2 +-
fs/fscache/cookie.c | 8 ++++----
fs/fscache/object.c | 8 ++++----
fs/fscache/operation.c | 2 +-
include/linux/fscache-cache.h | 37 ++++++++++++++++++++++++++++---------
6 files changed, 40 insertions(+), 21 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 07cbd44..01979a3 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -130,7 +130,7 @@ found_dentry:
fscache_object_states[object->fscache.state],
dentry);
- if (object->fscache.state < FSCACHE_OBJECT_DYING) {
+ if (fscache_object_is_live(&object->fscache)) {
printk(KERN_ERR "\n");
printk(KERN_ERR "CacheFiles: Error:"
" Can't preemptively bury live object\n");
@@ -192,7 +192,7 @@ try_again:
/* an old object from a previous incarnation is hogging the slot - we
* need to wait for it to be destroyed */
wait_for_old_object:
- if (xobject->fscache.state < FSCACHE_OBJECT_DYING) {
+ if (fscache_object_is_live(&object->fscache)) {
printk(KERN_ERR "\n");
printk(KERN_ERR "CacheFiles: Error:"
" Unexpected object collision\n");
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
index b52aed1..129ea53 100644
--- a/fs/fscache/cache.c
+++ b/fs/fscache/cache.c
@@ -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;
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index e2cba1f..a5f36c9 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -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);
}
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 0133699..863f687 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -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);
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index 762a9ec..ccf0219 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -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);
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 9b9c1de..c5f9234 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -417,15 +417,6 @@ struct fscache_object {
extern const char *fscache_object_states[];
-#define fscache_object_is_active(obj) \
- (!test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
- (obj)->state >= FSCACHE_OBJECT_AVAILABLE && \
- (obj)->state < FSCACHE_OBJECT_DYING)
-
-#define fscache_object_is_dead(obj) \
- (test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
- (obj)->state >= FSCACHE_OBJECT_DYING)
-
extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *,
struct fscache_cache *);
@@ -438,6 +429,34 @@ extern void fscache_object_destroy(struct fscache_object *object);
#define fscache_object_destroy(object) do {} while(0)
#endif
+static inline bool fscache_object_is_live(struct fscache_object *object)
+{
+ return object->state < FSCACHE_OBJECT_DYING;
+}
+
+static inline bool fscache_object_is_dying(struct fscache_object *object)
+{
+ return !fscache_object_is_live(object);
+}
+
+static inline bool fscache_object_is_available(struct fscache_object *object)
+{
+ return object->state >= FSCACHE_OBJECT_AVAILABLE;
+}
+
+static inline bool fscache_object_is_active(struct fscache_object *object)
+{
+ return fscache_object_is_available(object) &&
+ fscache_object_is_live(object) &&
+ !test_bit(FSCACHE_IOERROR, &object->cache->flags);
+}
+
+static inline bool fscache_object_is_dead(struct fscache_object *object)
+{
+ return fscache_object_is_dying(object) &&
+ test_bit(FSCACHE_IOERROR, &object->cache->flags);
+}
+
/**
* fscache_object_destroyed - Note destruction of an object in a cache
* @cache: The cache from which the object came
--
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