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9p: Drop kref usage 

An upcoming patch is going to require passing the client through
p9_req_put() -> p9_req_free(), but that's awkward with the kref
indirection - so this patch switches to using refcount_t directly.

Link: https://lkml.kernel.org/r/20220704014243.153050-1-kent.overstreet@gmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Kent Overstreet 2022-07-03 21:02:49 -04:00 committed by Dominique Martinet
parent e3baced02a
commit 6cda12864c
2 changed files with 11 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/9p/client.h
View File

@ -77,7 +77,7 @@ enum p9_req_status_t {
struct p9_req_t {
int status;
int t_err;
struct kref refcount;
refcount_t refcount;
wait_queue_head_t wq;
struct p9_fcall tc;
struct p9_fcall rc;
@ -228,12 +228,12 @@ struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag);
static inline void p9_req_get(struct p9_req_t *r)
{
kref_get(&r->refcount);
refcount_inc(&r->refcount);
}
static inline int p9_req_try_get(struct p9_req_t *r)
{
return kref_get_unless_zero(&r->refcount);
return refcount_inc_not_zero(&r->refcount);
}
int p9_req_put(struct p9_req_t *r);

19
net/9p/client.c
View File

@ -305,7 +305,7 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
* callback), so p9_client_cb eats the second ref there
* as the pointer is duplicated directly by virtqueue_add_sgs()
*/
refcount_set(&req->refcount.refcount, 2);
refcount_set(&req->refcount, 2);
return req;
@ -370,18 +370,15 @@ static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
return p9_req_put(r);
}
static void p9_req_free(struct kref *ref)
{
struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount);
p9_fcall_fini(&r->tc);
p9_fcall_fini(&r->rc);
kmem_cache_free(p9_req_cache, r);
}
int p9_req_put(struct p9_req_t *r)
{
return kref_put(&r->refcount, p9_req_free);
if (refcount_dec_and_test(&r->refcount)) {
p9_fcall_fini(&r->tc);
p9_fcall_fini(&r->rc);
kmem_cache_free(p9_req_cache, r);
return 1;
}
return 0;
}
EXPORT_SYMBOL(p9_req_put);