diff options
| author | Andreas Gruenbacher <agruen@linbit.com> | 2014-08-14 18:33:30 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-11-25 09:22:00 -0700 |
| commit | 28bc3b8c71cda033a4c013131c635d1148889824 (patch) | |
| tree | ceb03e905cdee0d06cd169f8affe46f722fd14d8 /drivers/block/drbd/drbd_state.c | |
| parent | 1ec317d3d1f9b9ec19926fdf2fc59fa3ec8cd15d (diff) | |
drbd: Fix locking across all resources
Instead of using a rwlock for synchronizing state changes across
resources, take the request locks of all resources for global state
changes. Use resources_mutex to serialize global state changes.
This means that taking the request lock of a resource is now enough to
prevent changes of that resource. (Previously, a read lock on the
global state lock was needed as well.)
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/drbd/drbd_state.c')
| -rw-r--r-- | drivers/block/drbd/drbd_state.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c index 2d7dd269b6a8..535ae47f84c9 100644 --- a/drivers/block/drbd/drbd_state.c +++ b/drivers/block/drbd/drbd_state.c @@ -937,7 +937,7 @@ void drbd_resume_al(struct drbd_device *device) drbd_info(device, "Resumed AL updates\n"); } -/* helper for __drbd_set_state */ +/* helper for _drbd_set_state */ static void set_ov_position(struct drbd_device *device, enum drbd_conns cs) { if (first_peer_device(device)->connection->agreed_pro_version < 90) @@ -965,17 +965,17 @@ static void set_ov_position(struct drbd_device *device, enum drbd_conns cs) } /** - * __drbd_set_state() - Set a new DRBD state + * _drbd_set_state() - Set a new DRBD state * @device: DRBD device. * @ns: new state. * @flags: Flags * @done: Optional completion, that will get completed after the after_state_ch() finished * - * Caller needs to hold req_lock, and global_state_lock. Do not call directly. + * Caller needs to hold req_lock. Do not call directly. */ enum drbd_state_rv -__drbd_set_state(struct drbd_device *device, union drbd_state ns, - enum chg_state_flags flags, struct completion *done) +_drbd_set_state(struct drbd_device *device, union drbd_state ns, + enum chg_state_flags flags, struct completion *done) { struct drbd_peer_device *peer_device = first_peer_device(device); struct drbd_connection *connection = peer_device ? peer_device->connection : NULL; @@ -1444,7 +1444,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os, if (os.disk != D_FAILED && ns.disk == D_FAILED) { enum drbd_io_error_p eh = EP_PASS_ON; int was_io_error = 0; - /* corresponding get_ldev was in __drbd_set_state, to serialize + /* corresponding get_ldev was in _drbd_set_state, to serialize * our cleanup here with the transition to D_DISKLESS. * But is is still not save to dreference ldev here, since * we might come from an failed Attach before ldev was set. */ @@ -1759,7 +1759,7 @@ conn_set_state(struct drbd_connection *connection, union drbd_state mask, union if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED) ns.disk = os.disk; - rv = __drbd_set_state(device, ns, flags, NULL); + rv = _drbd_set_state(device, ns, flags, NULL); if (rv < SS_SUCCESS) BUG(); |