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fscache: Use refcount_t for the cookie refcount instead of atomic_t

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Use refcount_t for the fscache_cookie refcount instead of atomic_t and
rename the 'usage' member to 'ref' in such cases.  The tracepoints that
reference it change from showing "u=%d" to "r=%d".

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/162431204358.2908479.8006938388213098079.stgit@warthog.procyon.org.uk/
This commit is contained in:
David Howells
2021-03-29 13:53:50 +01:00
parent 33cba85922
commit 20ec197bfa
6 changed files with 55 additions and 43 deletions
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2
fs/fscache/cache.c
View File

@@ -269,7 +269,7 @@ int fscache_add_cache(struct fscache_cache *cache,
hlist_add_head(&ifsdef->cookie_link,
&fscache_fsdef_index.backing_objects);
atomic_inc(&fscache_fsdef_index.usage);
refcount_inc(&fscache_fsdef_index.ref);
/* done */
spin_unlock(&fscache_fsdef_index.lock);

31
fs/fscache/cookie.c
View File

@@ -164,7 +164,7 @@ struct fscache_cookie *fscache_alloc_cookie(
goto nomem;
}
atomic_set(&cookie->usage, 1);
refcount_set(&cookie->ref, 1);
atomic_set(&cookie->n_children, 0);
cookie->debug_id = atomic_inc_return(&fscache_cookie_debug_id);
@@ -225,7 +225,7 @@ struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *candidate)
collision:
if (test_and_set_bit(FSCACHE_COOKIE_ACQUIRED, &cursor->flags)) {
trace_fscache_cookie(cursor->debug_id, atomic_read(&cursor->usage),
trace_fscache_cookie(cursor->debug_id, refcount_read(&cursor->ref),
fscache_cookie_collision);
pr_err("Duplicate cookie detected\n");
fscache_print_cookie(cursor, 'O');
@@ -826,13 +826,12 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie,
BUG_ON(!radix_tree_empty(&cookie->stores));
if (cookie->parent) {
ASSERTCMP(atomic_read(&cookie->parent->usage), >, 0);
ASSERTCMP(refcount_read(&cookie->parent->ref), >, 0);
ASSERTCMP(atomic_read(&cookie->parent->n_children), >, 0);
atomic_dec(&cookie->parent->n_children);
}
/* Dispose of the netfs's link to the cookie */
ASSERTCMP(atomic_read(&cookie->usage), >, 0);
fscache_cookie_put(cookie, fscache_cookie_put_relinquish);
_leave("");
@@ -862,18 +861,17 @@ void fscache_cookie_put(struct fscache_cookie *cookie,
enum fscache_cookie_trace where)
{
struct fscache_cookie *parent;
int usage;
int ref;
_enter("%x", cookie->debug_id);
do {
unsigned int cookie_debug_id = cookie->debug_id;
usage = atomic_dec_return(&cookie->usage);
trace_fscache_cookie(cookie_debug_id, usage, where);
bool zero = __refcount_dec_and_test(&cookie->ref, &ref);
if (usage > 0)
trace_fscache_cookie(cookie_debug_id, ref - 1, where);
if (!zero)
return;
BUG_ON(usage < 0);
parent = cookie->parent;
fscache_unhash_cookie(cookie);
@@ -886,6 +884,19 @@ void fscache_cookie_put(struct fscache_cookie *cookie,
_leave("");
}
/*
* Get a reference to a cookie.
*/
struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *cookie,
enum fscache_cookie_trace where)
{
int ref;
__refcount_inc(&cookie->ref, &ref);
trace_fscache_cookie(cookie->debug_id, ref + 1, where);
return cookie;
}
/*
* check the consistency between the netfs inode and the backing cache
*
@@ -1003,7 +1014,7 @@ static int fscache_cookies_seq_show(struct seq_file *m, void *v)
"%08x %08x %5u %5u %3u %s %03lx %-16s %px",
cookie->debug_id,
cookie->parent ? cookie->parent->debug_id : 0,
atomic_read(&cookie->usage),
refcount_read(&cookie->ref),
atomic_read(&cookie->n_children),
atomic_read(&cookie->n_active),
type,

2
fs/fscache/fsdef.c
View File

@@ -46,7 +46,7 @@ static struct fscache_cookie_def fscache_fsdef_index_def = {
struct fscache_cookie fscache_fsdef_index = {
.debug_id = 1,
.usage = ATOMIC_INIT(1),
.ref = REFCOUNT_INIT(1),
.n_active = ATOMIC_INIT(1),
.lock = __SPIN_LOCK_UNLOCKED(fscache_fsdef_index.lock),
.backing_objects = HLIST_HEAD_INIT,

17
fs/fscache/internal.h
View File

@@ -54,9 +54,18 @@ extern struct fscache_cookie *fscache_alloc_cookie(struct fscache_cookie *,
const void *, size_t,
void *, loff_t);
extern struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *);
extern struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *,
enum fscache_cookie_trace);
extern void fscache_cookie_put(struct fscache_cookie *,
enum fscache_cookie_trace);
static inline void fscache_cookie_see(struct fscache_cookie *cookie,
enum fscache_cookie_trace where)
{
trace_fscache_cookie(cookie->debug_id, refcount_read(&cookie->ref),
where);
}
/*
* fsdef.c
*/
@@ -286,14 +295,6 @@ static inline void fscache_raise_event(struct fscache_object *object,
fscache_enqueue_object(object);
}
static inline void fscache_cookie_get(struct fscache_cookie *cookie,
enum fscache_cookie_trace where)
{
int usage = atomic_inc_return(&cookie->usage);
trace_fscache_cookie(cookie->debug_id, usage, where);
}
/*
* get an extra reference to a netfs retrieval context
*/