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Message-ID: <158861217055.340223.17464479642843198381.stgit@warthog.procyon.org.uk>
Date: Mon, 04 May 2020 18:09:30 +0100
From: David Howells <dhowells@...hat.com>
To: Trond Myklebust <trondmy@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Jeff Layton <jlayton@...hat.com>
Cc: dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
v9fs-developer@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 14/61] fscache: Remove fscache_check_consistency()
Remove fscache_check_consistency() as that allows the netfs to pry into the
inner working of the cache - and what's in the cookie should be taken as
consistent with the disk (possibly lazily).
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/cachefiles/interface.c | 26 -------------
fs/fscache/cookie.c | 79 ----------------------------------------
fs/fscache/internal.h | 9 -----
fs/fscache/page.c | 82 -----------------------------------------
include/linux/fscache-cache.h | 4 --
include/linux/fscache.h | 23 ------------
6 files changed, 223 deletions(-)
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index a5d348581bcc..a3837ed090a8 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -320,31 +320,6 @@ static void cachefiles_sync_cache(struct fscache_cache *_cache)
ret);
}
-/*
- * check if the backing cache is updated to FS-Cache
- * - called by FS-Cache when evaluates if need to invalidate the cache
- */
-static int cachefiles_check_consistency(struct fscache_operation *op)
-{
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- int ret;
-
- _enter("{OBJ%x}", op->object->debug_id);
-
- object = container_of(op->object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_check_auxdata(object);
- cachefiles_end_secure(cache, saved_cred);
-
- _leave(" = %d", ret);
- return ret;
-}
-
/*
* notification the attributes on an object have changed
* - called with reads/writes excluded by FS-Cache
@@ -468,5 +443,4 @@ const struct fscache_cache_ops cachefiles_cache_ops = {
.put_object = cachefiles_put_object,
.sync_cache = cachefiles_sync_cache,
.attr_changed = cachefiles_attr_changed,
- .check_consistency = cachefiles_check_consistency,
};
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index bcaadbcaa0b2..cd2e166d5f29 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -883,85 +883,6 @@ void fscache_cookie_put(struct fscache_cookie *cookie,
_leave("");
}
-/*
- * check the consistency between the netfs inode and the backing cache
- *
- * NOTE: it only serves no-index type
- */
-int __fscache_check_consistency(struct fscache_cookie *cookie,
- const void *aux_data)
-{
- struct fscache_operation *op;
- struct fscache_object *object;
- bool wake_cookie = false;
- int ret;
-
- _enter("%p,", cookie);
-
- ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
-
- if (fscache_wait_for_deferred_lookup(cookie) < 0)
- return -ERESTARTSYS;
-
- if (hlist_empty(&cookie->backing_objects))
- return 0;
-
- op = kzalloc(sizeof(*op), GFP_NOIO | __GFP_NOMEMALLOC | __GFP_NORETRY);
- if (!op)
- return -ENOMEM;
-
- fscache_operation_init(cookie, op, NULL, NULL, NULL);
- op->flags = FSCACHE_OP_MYTHREAD |
- (1 << FSCACHE_OP_WAITING) |
- (1 << FSCACHE_OP_UNUSE_COOKIE);
- trace_fscache_page_op(cookie, NULL, op, fscache_page_op_check_consistency);
-
- spin_lock(&cookie->lock);
-
- fscache_update_aux(cookie, aux_data);
-
- if (!fscache_cookie_enabled(cookie) ||
- hlist_empty(&cookie->backing_objects))
- goto inconsistent;
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object, cookie_link);
- if (test_bit(FSCACHE_IOERROR, &object->cache->flags))
- goto inconsistent;
-
- op->debug_id = atomic_inc_return(&fscache_op_debug_id);
-
- __fscache_use_cookie(cookie);
- if (fscache_submit_op(object, op) < 0)
- goto submit_failed;
-
- /* the work queue now carries its own ref on the object */
- spin_unlock(&cookie->lock);
-
- ret = fscache_wait_for_operation_activation(object, op, NULL, NULL);
- if (ret == 0) {
- /* ask the cache to honour the operation */
- ret = object->cache->ops->check_consistency(op);
- fscache_op_complete(op, false);
- } else if (ret == -ENOBUFS) {
- ret = 0;
- }
-
- fscache_put_operation(op);
- _leave(" = %d", ret);
- return ret;
-
-submit_failed:
- wake_cookie = __fscache_unuse_cookie(cookie);
-inconsistent:
- spin_unlock(&cookie->lock);
- if (wake_cookie)
- __fscache_wake_unused_cookie(cookie);
- kfree(op);
- _leave(" = -ESTALE");
- return -ESTALE;
-}
-EXPORT_SYMBOL(__fscache_check_consistency);
-
/*
* Generate a list of extant cookies in /proc/fs/fscache/cookies
*/
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index bc66bf7182ed..20cbd1288b5a 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -151,15 +151,6 @@ extern void fscache_abort_object(struct fscache_object *);
extern void fscache_start_operations(struct fscache_object *);
extern void fscache_operation_gc(struct work_struct *);
-/*
- * page.c
- */
-extern int fscache_wait_for_deferred_lookup(struct fscache_cookie *);
-extern int fscache_wait_for_operation_activation(struct fscache_object *,
- struct fscache_operation *,
- atomic_t *,
- atomic_t *);
-
/*
* proc.c
*/
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index fd9cc16abc18..73636e9d652d 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -96,85 +96,3 @@ int __fscache_attr_changed(struct fscache_cookie *cookie)
return -ENOBUFS;
}
EXPORT_SYMBOL(__fscache_attr_changed);
-
-/*
- * wait for a deferred lookup to complete
- */
-int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
-{
- unsigned long jif;
-
- _enter("");
-
- if (!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags)) {
- _leave(" = 0 [imm]");
- return 0;
- }
-
- fscache_stat(&fscache_n_retrievals_wait);
-
- jif = jiffies;
- if (wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP,
- TASK_INTERRUPTIBLE) != 0) {
- fscache_stat(&fscache_n_retrievals_intr);
- _leave(" = -ERESTARTSYS");
- return -ERESTARTSYS;
- }
-
- ASSERT(!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags));
-
- smp_rmb();
- fscache_hist(fscache_retrieval_delay_histogram, jif);
- _leave(" = 0 [dly]");
- return 0;
-}
-
-/*
- * wait for an object to become active (or dead)
- */
-int fscache_wait_for_operation_activation(struct fscache_object *object,
- struct fscache_operation *op,
- atomic_t *stat_op_waits,
- atomic_t *stat_object_dead)
-{
- int ret;
-
- if (!test_bit(FSCACHE_OP_WAITING, &op->flags))
- goto check_if_dead;
-
- _debug(">>> WT");
- if (stat_op_waits)
- fscache_stat(stat_op_waits);
- if (wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
- TASK_INTERRUPTIBLE) != 0) {
- trace_fscache_op(object->cookie, op, fscache_op_signal);
- ret = fscache_cancel_op(op, false);
- if (ret == 0)
- return -ERESTARTSYS;
-
- /* it's been removed from the pending queue by another party,
- * so we should get to run shortly */
- wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
- TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
-
-check_if_dead:
- if (op->state == FSCACHE_OP_ST_CANCELLED) {
- if (stat_object_dead)
- fscache_stat(stat_object_dead);
- _leave(" = -ENOBUFS [cancelled]");
- return -ENOBUFS;
- }
- if (unlikely(fscache_object_is_dying(object) ||
- fscache_cache_is_broken(object))) {
- enum fscache_operation_state state = op->state;
- trace_fscache_op(object->cookie, op, fscache_op_signal);
- fscache_cancel_op(op, true);
- if (stat_object_dead)
- fscache_stat(stat_object_dead);
- _leave(" = -ENOBUFS [obj dead %d]", state);
- return -ENOBUFS;
- }
- return 0;
-}
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 81418056f43f..3a78e41d2338 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -167,10 +167,6 @@ struct fscache_cache_ops {
/* unpin an object in the cache */
void (*unpin_object)(struct fscache_object *object);
- /* check the consistency between the backing cache and the FS-Cache
- * cookie */
- int (*check_consistency)(struct fscache_operation *op);
-
/* store the updated auxiliary data on an object */
void (*update_object)(struct fscache_object *object);
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 64d9ef34da49..82e871a3dc6a 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -139,7 +139,6 @@ extern struct fscache_cookie *__fscache_acquire_cookie(
const void *, size_t,
loff_t, bool);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, const void *, bool);
-extern int __fscache_check_consistency(struct fscache_cookie *, const void *);
extern void __fscache_update_cookie(struct fscache_cookie *, const void *);
extern int __fscache_attr_changed(struct fscache_cookie *);
extern void __fscache_invalidate(struct fscache_cookie *);
@@ -290,28 +289,6 @@ void fscache_relinquish_cookie(struct fscache_cookie *cookie,
__fscache_relinquish_cookie(cookie, aux_data, retire);
}
-/**
- * fscache_check_consistency - Request validation of a cache's auxiliary data
- * @cookie: The cookie representing the cache object
- * @aux_data: The updated auxiliary data for the cookie (may be NULL)
- *
- * Request an consistency check from fscache, which passes the request to the
- * backing cache. The auxiliary data on the cookie will be updated first if
- * @aux_data is set.
- *
- * Returns 0 if consistent and -ESTALE if inconsistent. May also
- * return -ENOMEM and -ERESTARTSYS.
- */
-static inline
-int fscache_check_consistency(struct fscache_cookie *cookie,
- const void *aux_data)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- return __fscache_check_consistency(cookie, aux_data);
- else
- return 0;
-}
-
/**
* fscache_update_cookie - Request that a cache object be updated
* @cookie: The cookie representing the cache object
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