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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 08/76] fscache: Remove store_limit* from struct fscache_object From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet Cc: dhowells@redhat.com, Jeff Layton , Matthew Wilcox , Alexander Viro , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 20 Nov 2020 15:04:22 +0000 Message-ID: <160588466212.3465195.14611606565741215465.stgit@warthog.procyon.org.uk> In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> References: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Remove the store_limit values from struct fscache_object and store the object size in the cookie. The netfs can update this at will, and we don't want to call back into the netfs to fetch it. Signed-off-by: David Howells --- fs/cachefiles/interface.c | 10 ++-------- fs/fscache/cookie.c | 14 ++++++-------- fs/fscache/object.c | 2 -- include/linux/fscache-cache.h | 22 ---------------------- include/linux/fscache.h | 1 + 5 files changed, 9 insertions(+), 40 deletions(-) diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c index b7aa5c733cb7..a5d348581bcc 100644 --- a/fs/cachefiles/interface.c +++ b/fs/cachefiles/interface.c @@ -359,7 +359,7 @@ static int cachefiles_attr_changed(struct fscache_object *_object) loff_t oi_size; int ret; - ni_size = _object->store_limit_l; + ni_size = _object->cookie->object_size; _enter("{OBJ%x},[%llu]", _object->debug_id, (unsigned long long) ni_size); @@ -376,8 +376,6 @@ static int cachefiles_attr_changed(struct fscache_object *_object) ASSERT(d_is_reg(object->backer)); - fscache_set_store_limit(&object->fscache, ni_size); - oi_size = i_size_read(d_backing_inode(object->backer)); if (oi_size == ni_size) return 0; @@ -406,7 +404,6 @@ static int cachefiles_attr_changed(struct fscache_object *_object) cachefiles_end_secure(cache, saved_cred); if (ret == -EIO) { - fscache_set_store_limit(&object->fscache, 0); cachefiles_io_error_obj(object, "Size set failed"); ret = -ENOBUFS; } @@ -431,7 +428,7 @@ static void cachefiles_invalidate_object(struct fscache_operation *op) cache = container_of(object->fscache.cache, struct cachefiles_cache, cache); - ni_size = op->object->store_limit_l; + ni_size = op->object->cookie->object_size; _enter("{OBJ%x},[%llu]", op->object->debug_id, (unsigned long long)ni_size); @@ -439,8 +436,6 @@ static void cachefiles_invalidate_object(struct fscache_operation *op) if (object->backer) { ASSERT(d_is_reg(object->backer)); - fscache_set_store_limit(&object->fscache, ni_size); - path.dentry = object->backer; path.mnt = cache->mnt; @@ -451,7 +446,6 @@ static void cachefiles_invalidate_object(struct fscache_operation *op) cachefiles_end_secure(cache, saved_cred); if (ret != 0) { - fscache_set_store_limit(&object->fscache, 0); if (ret == -EIO) cachefiles_io_error_obj(object, "Invalidate failed"); diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index 32c070c929b9..7811fe935b47 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -22,8 +22,7 @@ static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift]; static LIST_HEAD(fscache_cookies); static DEFINE_RWLOCK(fscache_cookies_lock); -static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie, - loff_t object_size); +static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie); static int fscache_alloc_object(struct fscache_cache *cache, struct fscache_cookie *cookie); static int fscache_attach_object(struct fscache_cookie *cookie, @@ -167,6 +166,7 @@ struct fscache_cookie *fscache_alloc_cookie( cookie->advice = advice; cookie->key_len = index_key_len; cookie->aux_len = aux_data_len; + cookie->object_size = object_size; strlcpy(cookie->type_name, type_name, sizeof(cookie->type_name)); if (fscache_set_key(cookie, index_key, index_key_len) < 0) @@ -337,7 +337,7 @@ struct fscache_cookie *__fscache_acquire_cookie( * - we create indices on disk when we need them as an index * may exist in multiple caches */ if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) { - if (fscache_acquire_non_index_cookie(cookie, object_size) == 0) { + if (fscache_acquire_non_index_cookie(cookie) == 0) { set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags); } else { atomic_dec(&parent->n_children); @@ -376,6 +376,7 @@ void __fscache_enable_cookie(struct fscache_cookie *cookie, wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK, TASK_UNINTERRUPTIBLE); + cookie->object_size = object_size; fscache_update_aux(cookie, aux_data); if (test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags)) @@ -387,7 +388,7 @@ void __fscache_enable_cookie(struct fscache_cookie *cookie, /* Wait for outstanding disablement to complete */ __fscache_wait_on_invalidate(cookie); - if (fscache_acquire_non_index_cookie(cookie, object_size) == 0) + if (fscache_acquire_non_index_cookie(cookie) == 0) set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags); } else { set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags); @@ -404,8 +405,7 @@ EXPORT_SYMBOL(__fscache_enable_cookie); * - this must make sure the index chain is instantiated and instantiate the * object representation too */ -static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie, - loff_t object_size) +static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie) { struct fscache_object *object; struct fscache_cache *cache; @@ -456,8 +456,6 @@ static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie, object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); - fscache_set_store_limit(object, object_size); - /* initiate the process of looking up all the objects in the chain * (done by fscache_initialise_object()) */ fscache_raise_event(object, FSCACHE_OBJECT_EV_NEW_CHILD); diff --git a/fs/fscache/object.c b/fs/fscache/object.c index bb551e29454d..e2e04ac2c0a1 100644 --- a/fs/fscache/object.c +++ b/fs/fscache/object.c @@ -319,8 +319,6 @@ void fscache_object_init(struct fscache_object *object, object->n_children = 0; object->n_ops = object->n_in_progress = object->n_exclusive = 0; object->events = 0; - object->store_limit = 0; - object->store_limit_l = 0; object->cache = cache; object->cookie = cookie; fscache_cookie_get(cookie, fscache_cookie_get_attach_object); diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h index 0b395bcb4b16..fd07843e3d69 100644 --- a/include/linux/fscache-cache.h +++ b/include/linux/fscache-cache.h @@ -274,8 +274,6 @@ struct fscache_object { #ifdef CONFIG_FSCACHE_OBJECT_LIST struct rb_node objlist_link; /* link in global object list */ #endif - pgoff_t store_limit; /* current storage limit */ - loff_t store_limit_l; /* current storage limit */ }; extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *, @@ -336,26 +334,6 @@ static inline void fscache_object_lookup_error(struct fscache_object *object) set_bit(FSCACHE_OBJECT_EV_ERROR, &object->events); } -/** - * fscache_set_store_limit - Set the maximum size to be stored in an object - * @object: The object to set the maximum on - * @i_size: The limit to set in bytes - * - * Set the maximum size an object is permitted to reach, implying the highest - * byte that may be written. Intended to be called by the attr_changed() op. - * - * See Documentation/filesystems/caching/backend-api.rst for a complete - * description. - */ -static inline -void fscache_set_store_limit(struct fscache_object *object, loff_t i_size) -{ - object->store_limit_l = i_size; - object->store_limit = i_size >> PAGE_SHIFT; - if (i_size & ~PAGE_MASK) - object->store_limit++; -} - static inline void __fscache_use_cookie(struct fscache_cookie *cookie) { atomic_inc(&cookie->n_active); diff --git a/include/linux/fscache.h b/include/linux/fscache.h index a930532a39d0..f855f6d04667 100644 --- a/include/linux/fscache.h +++ b/include/linux/fscache.h @@ -83,6 +83,7 @@ struct fscache_cookie { struct hlist_bl_node hash_link; /* Link in hash table */ struct list_head proc_link; /* Link in proc list */ char type_name[8]; /* Cookie type name */ + loff_t object_size; /* Size of the netfs object */ unsigned long flags; #define FSCACHE_COOKIE_LOOKING_UP 0 /* T if non-index cookie being looked up still */