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Message-Id: <20230813160605.1080385-28-sashal@kernel.org>
Date: Sun, 13 Aug 2023 12:06:01 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Ilya Dryomov <idryomov@...il.com>,
Dongsheng Yang <dongsheng.yang@...ystack.cn>,
Sasha Levin <sashal@...nel.org>, axboe@...nel.dk,
ceph-devel@...r.kernel.org, linux-block@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 28/31] rbd: make get_lock_owner_info() return a single locker or NULL
From: Ilya Dryomov <idryomov@...il.com>
[ Upstream commit f38cb9d9c2045dad16eead4a2e1aedfddd94603b ]
Make the "num_lockers can be only 0 or 1" assumption explicit and
simplify the API by getting rid of output parameters in preparation
for calling get_lock_owner_info() twice before blocklisting.
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@...ystack.cn>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/block/rbd.c | 84 +++++++++++++++++++++++++++------------------
1 file changed, 51 insertions(+), 33 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index a4188825bd195..189e2f74b9147 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3851,10 +3851,17 @@ static void wake_lock_waiters(struct rbd_device *rbd_dev, int result)
list_splice_tail_init(&rbd_dev->acquiring_list, &rbd_dev->running_list);
}
-static int get_lock_owner_info(struct rbd_device *rbd_dev,
- struct ceph_locker **lockers, u32 *num_lockers)
+static void free_locker(struct ceph_locker *locker)
+{
+ if (locker)
+ ceph_free_lockers(locker, 1);
+}
+
+static struct ceph_locker *get_lock_owner_info(struct rbd_device *rbd_dev)
{
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
+ struct ceph_locker *lockers;
+ u32 num_lockers;
u8 lock_type;
char *lock_tag;
int ret;
@@ -3863,39 +3870,45 @@ static int get_lock_owner_info(struct rbd_device *rbd_dev,
ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid,
&rbd_dev->header_oloc, RBD_LOCK_NAME,
- &lock_type, &lock_tag, lockers, num_lockers);
- if (ret)
- return ret;
+ &lock_type, &lock_tag, &lockers, &num_lockers);
+ if (ret) {
+ rbd_warn(rbd_dev, "failed to retrieve lockers: %d", ret);
+ return ERR_PTR(ret);
+ }
- if (*num_lockers == 0) {
+ if (num_lockers == 0) {
dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev);
+ lockers = NULL;
goto out;
}
if (strcmp(lock_tag, RBD_LOCK_TAG)) {
rbd_warn(rbd_dev, "locked by external mechanism, tag %s",
lock_tag);
- ret = -EBUSY;
- goto out;
+ goto err_busy;
}
if (lock_type == CEPH_CLS_LOCK_SHARED) {
rbd_warn(rbd_dev, "shared lock type detected");
- ret = -EBUSY;
- goto out;
+ goto err_busy;
}
- if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX,
+ WARN_ON(num_lockers != 1);
+ if (strncmp(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX,
strlen(RBD_LOCK_COOKIE_PREFIX))) {
rbd_warn(rbd_dev, "locked by external mechanism, cookie %s",
- (*lockers)[0].id.cookie);
- ret = -EBUSY;
- goto out;
+ lockers[0].id.cookie);
+ goto err_busy;
}
out:
kfree(lock_tag);
- return ret;
+ return lockers;
+
+err_busy:
+ kfree(lock_tag);
+ ceph_free_lockers(lockers, num_lockers);
+ return ERR_PTR(-EBUSY);
}
static int find_watcher(struct rbd_device *rbd_dev,
@@ -3949,51 +3962,56 @@ static int find_watcher(struct rbd_device *rbd_dev,
static int rbd_try_lock(struct rbd_device *rbd_dev)
{
struct ceph_client *client = rbd_dev->rbd_client->client;
- struct ceph_locker *lockers;
- u32 num_lockers;
+ struct ceph_locker *locker;
int ret;
for (;;) {
+ locker = NULL;
+
ret = rbd_lock(rbd_dev);
if (ret != -EBUSY)
- return ret;
+ goto out;
/* determine if the current lock holder is still alive */
- ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers);
- if (ret)
- return ret;
-
- if (num_lockers == 0)
+ locker = get_lock_owner_info(rbd_dev);
+ if (IS_ERR(locker)) {
+ ret = PTR_ERR(locker);
+ locker = NULL;
+ goto out;
+ }
+ if (!locker)
goto again;
- ret = find_watcher(rbd_dev, lockers);
+ ret = find_watcher(rbd_dev, locker);
if (ret)
goto out; /* request lock or error */
rbd_warn(rbd_dev, "breaking header lock owned by %s%llu",
- ENTITY_NAME(lockers[0].id.name));
+ ENTITY_NAME(locker->id.name));
ret = ceph_monc_blocklist_add(&client->monc,
- &lockers[0].info.addr);
+ &locker->info.addr);
if (ret) {
- rbd_warn(rbd_dev, "blocklist of %s%llu failed: %d",
- ENTITY_NAME(lockers[0].id.name), ret);
+ rbd_warn(rbd_dev, "failed to blocklist %s%llu: %d",
+ ENTITY_NAME(locker->id.name), ret);
goto out;
}
ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid,
&rbd_dev->header_oloc, RBD_LOCK_NAME,
- lockers[0].id.cookie,
- &lockers[0].id.name);
- if (ret && ret != -ENOENT)
+ locker->id.cookie, &locker->id.name);
+ if (ret && ret != -ENOENT) {
+ rbd_warn(rbd_dev, "failed to break header lock: %d",
+ ret);
goto out;
+ }
again:
- ceph_free_lockers(lockers, num_lockers);
+ free_locker(locker);
}
out:
- ceph_free_lockers(lockers, num_lockers);
+ free_locker(locker);
return ret;
}
--
2.40.1
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