diff options
| author | Ilya Dryomov <idryomov@gmail.com> | 2018-09-28 16:02:53 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2018-10-22 10:28:21 +0200 |
| commit | 894868330a1e038ea4a65dbb81741eef70ad71b1 (patch) | |
| tree | 50c12aec68b82146b05c6e18cc76117af0047ded | |
| parent | 33165d472310262d8c79c7e4d1a17dc60cea7e35 (diff) | |
libceph: don't consume a ref on pagelist in ceph_msg_data_add_pagelist()
Because send_mds_reconnect() wants to send a message with a pagelist
and pass the ownership to the messenger, ceph_msg_data_add_pagelist()
consumes a ref which is then put in ceph_msg_data_destroy(). This
makes managing pagelists in the OSD client (where they are wrapped in
ceph_osd_data) unnecessarily hard because the handoff only happens in
ceph_osdc_start_request() instead of when the pagelist is passed to
ceph_osd_data_pagelist_init(). I counted several memory leaks on
various error paths.
Fix up ceph_msg_data_add_pagelist() and carry a pagelist ref in
ceph_osd_data.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
| -rw-r--r-- | fs/ceph/mds_client.c | 2 | ||||
| -rw-r--r-- | net/ceph/messenger.c | 1 | ||||
| -rw-r--r-- | net/ceph/osd_client.c | 8 |
3 files changed, 10 insertions, 1 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 580a79b9a91f..97de674ea377 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -2136,7 +2136,6 @@ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, if (req->r_pagelist) { struct ceph_pagelist *pagelist = req->r_pagelist; - refcount_inc(&pagelist->refcnt); ceph_msg_data_add_pagelist(msg, pagelist); msg->hdr.data_len = cpu_to_le32(pagelist->length); } else { @@ -3240,6 +3239,7 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc, mutex_unlock(&mdsc->mutex); up_read(&mdsc->snap_rwsem); + ceph_pagelist_release(pagelist); return; fail: diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 0a187196aeed..76684edc43ef 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -3313,6 +3313,7 @@ void ceph_msg_data_add_pagelist(struct ceph_msg *msg, data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST); BUG_ON(!data); + refcount_inc(&pagelist->refcnt); data->pagelist = pagelist; list_add_tail(&data->links, &msg->data); diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index db2ebc9e5f1f..ad00495dbd39 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -126,6 +126,9 @@ static void ceph_osd_data_init(struct ceph_osd_data *osd_data) osd_data->type = CEPH_OSD_DATA_TYPE_NONE; } +/* + * Consumes @pages if @own_pages is true. + */ static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data, struct page **pages, u64 length, u32 alignment, bool pages_from_pool, bool own_pages) @@ -138,6 +141,9 @@ static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data, osd_data->own_pages = own_pages; } +/* + * Consumes a ref on @pagelist. + */ static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data, struct ceph_pagelist *pagelist) { @@ -362,6 +368,8 @@ static void ceph_osd_data_release(struct ceph_osd_data *osd_data) num_pages = calc_pages_for((u64)osd_data->alignment, (u64)osd_data->length); ceph_release_page_vector(osd_data->pages, num_pages); + } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) { + ceph_pagelist_release(osd_data->pagelist); } ceph_osd_data_init(osd_data); } |