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libceph: add spinlock around osd->o_requests

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In a later patch, we're going to need to search for a request in
the rbtree, but taking the o_mutex is inconvenient as we already
hold the con mutex at the point where we need it.

Add a new spinlock that we take when inserting and erasing entries from
the o_requests tree. Search of the rbtree can be done with either the
mutex or the spinlock, but insertion and removal requires both.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2022-03-14 15:47:18 -04:00 committed by Ilya Dryomov
parent 706a741595
commit 08b8a0440e
2 changed files with 12 additions and 1 deletions
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8
include/linux/ceph/osd_client.h
View file

@ -29,7 +29,12 @@ typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *);
#define CEPH_HOMELESS_OSD -1
/* a given osd we're communicating with */
/*
* A given osd we're communicating with.
*
* Note that the o_requests tree can be searched while holding the "lock" mutex
* or the "o_requests_lock" spinlock. Insertion or removal requires both!
*/
struct ceph_osd {
refcount_t o_ref;
struct ceph_osd_client *o_osdc;
@ -37,6 +42,7 @@ struct ceph_osd {
int o_incarnation;
struct rb_node o_node;
struct ceph_connection o_con;
spinlock_t o_requests_lock;
struct rb_root o_requests;
struct rb_root o_linger_requests;
struct rb_root o_backoff_mappings;

5
net/ceph/osd_client.c
View file

@ -1177,6 +1177,7 @@ static void osd_init(struct ceph_osd *osd)
{
refcount_set(&osd->o_ref, 1);
RB_CLEAR_NODE(&osd->o_node);
spin_lock_init(&osd->o_requests_lock);
osd->o_requests = RB_ROOT;
osd->o_linger_requests = RB_ROOT;
osd->o_backoff_mappings = RB_ROOT;
@ -1406,7 +1407,9 @@ static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
atomic_inc(&osd->o_osdc->num_homeless);
get_osd(osd);
spin_lock(&osd->o_requests_lock);
insert_request(&osd->o_requests, req);
spin_unlock(&osd->o_requests_lock);
req->r_osd = osd;
}
@ -1418,7 +1421,9 @@ static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
req, req->r_tid);
req->r_osd = NULL;
spin_lock(&osd->o_requests_lock);
erase_request(&osd->o_requests, req);
spin_unlock(&osd->o_requests_lock);
put_osd(osd);
if (!osd_homeless(osd))