diff options
author | Yan, Zheng <zyan@redhat.com> | 2015-03-23 20:12:20 +0800 |
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committer | Ilya Dryomov <idryomov@gmail.com> | 2015-04-20 18:55:35 +0300 |
commit | db40cc1702d6a7049740d269cf6c1a42f979c7a7 (patch) | |
tree | 9e37f60353da7f0e04afc0aa5b775244da5f6345 /fs/ceph | |
parent | 3ef650d3989677bd460497f9c3b0d58caaba0116 (diff) | |
download | linux-stable-db40cc1702d6a7049740d269cf6c1a42f979c7a7.tar.gz linux-stable-db40cc1702d6a7049740d269cf6c1a42f979c7a7.tar.bz2 linux-stable-db40cc1702d6a7049740d269cf6c1a42f979c7a7.zip |
ceph: keep i_snap_realm while there are writers
when reconnecting to MDS is denied, we remove session caps
forcibly. But it's possible there are ongoing write, the
write code needs to reference i_snap_realm. So if there are
ongoing write, we keep i_snap_realm.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r-- | fs/ceph/caps.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 8172775428a0..4ddadc13d162 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -896,6 +896,18 @@ int ceph_is_any_caps(struct inode *inode) return ret; } +static void drop_inode_snap_realm(struct ceph_inode_info *ci) +{ + struct ceph_snap_realm *realm = ci->i_snap_realm; + spin_lock(&realm->inodes_with_caps_lock); + list_del_init(&ci->i_snap_realm_item); + ci->i_snap_realm_counter++; + ci->i_snap_realm = NULL; + spin_unlock(&realm->inodes_with_caps_lock); + ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc, + realm); +} + /* * Remove a cap. Take steps to deal with a racing iterate_session_caps. * @@ -946,15 +958,13 @@ void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release) if (removed) ceph_put_cap(mdsc, cap); - if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) { - struct ceph_snap_realm *realm = ci->i_snap_realm; - spin_lock(&realm->inodes_with_caps_lock); - list_del_init(&ci->i_snap_realm_item); - ci->i_snap_realm_counter++; - ci->i_snap_realm = NULL; - spin_unlock(&realm->inodes_with_caps_lock); - ceph_put_snap_realm(mdsc, realm); - } + /* when reconnect denied, we remove session caps forcibly, + * i_wr_ref can be non-zero. If there are ongoing write, + * keep i_snap_realm. + */ + if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm) + drop_inode_snap_realm(ci); + if (!__ceph_is_any_real_caps(ci)) __cap_delay_cancel(mdsc, ci); } @@ -2309,6 +2319,9 @@ void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) wake = 1; } } + /* see comment in __ceph_remove_cap() */ + if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) + drop_inode_snap_realm(ci); } spin_unlock(&ci->i_ceph_lock); |