diff options
Diffstat (limited to 'include/scsi/libiscsi.h')
| -rw-r--r-- | include/scsi/libiscsi.h | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h index 309f51336fb..728c9ad9feb 100644 --- a/include/scsi/libiscsi.h +++ b/include/scsi/libiscsi.h @@ -133,6 +133,10 @@ struct iscsi_task { unsigned long last_xfer; unsigned long last_timeout; bool have_checked_conn; + + /* T10 protection information */ + bool protected; + /* state set/tested under session->lock */ int state; atomic_t refcount; @@ -327,12 +331,19 @@ struct iscsi_session { struct iscsi_transport *tt; struct Scsi_Host *host; struct iscsi_conn *leadconn; /* leading connection */ - spinlock_t lock; /* protects session state, * - * sequence numbers, * + /* Between the forward and the backward locks exists a strict locking + * hierarchy. The mutual exclusion zone protected by the forward lock + * can enclose the mutual exclusion zone protected by the backward lock + * but not vice versa. + */ + spinlock_t frwd_lock; /* protects session state, * + * cmdsn, queued_cmdsn * * session resources: * - * - cmdpool, * - * - mgmtpool, * - * - r2tpool */ + * - cmdpool kfifo_out , * + * - mgmtpool, */ + spinlock_t back_lock; /* protects cmdsn_exp * + * cmdsn_max, * + * cmdpool kfifo_in */ int state; /* session state */ int age; /* counts session re-opens */ |