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authorChengguang Xu <cgxu519@icloud.com>2018-02-23 17:09:38 +0800
committerIlya Dryomov <idryomov@gmail.com>2018-04-02 10:12:46 +0200
commitb884014a91a49ed0e7198d276b28887cc48363bd (patch)
tree5bef0732e3736d68dbb5c57f60bc532d3fe74d40 /fs/ceph
parentf2f87877b8f29a4aa0000a2e3cdf806ac645500e (diff)
ceph: adding protection for showing cap reservation info
Adding spinlock protection during getting cap reservation ralated fields so that the numbers match below BUG_ON condition in the code. BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + mdsc->caps_reserve_count + mdsc->caps_avail_count); Signed-off-by: Chengguang Xu <cgxu519@icloud.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/caps.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 0e5bd3e3344e..1d02648788e3 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -341,6 +341,8 @@ void ceph_reservation_status(struct ceph_fs_client *fsc,
{
struct ceph_mds_client *mdsc = fsc->mdsc;
+ spin_lock(&mdsc->caps_list_lock);
+
if (total)
*total = mdsc->caps_total_count;
if (avail)
@@ -351,6 +353,8 @@ void ceph_reservation_status(struct ceph_fs_client *fsc,
*reserved = mdsc->caps_reserve_count;
if (min)
*min = mdsc->caps_min_count;
+
+ spin_unlock(&mdsc->caps_list_lock);
}
/*