This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / gfs2 / glock.h

diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
new file mode 100644 (file)
index 0000000..11477ca
--- /dev/null
+++ b/fs/gfs2/glock.h
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#ifndef __GLOCK_DOT_H__
+#define __GLOCK_DOT_H__
+
+#include "incore.h"
+
+/* Flags for lock requests; used in gfs2_holder gh_flag field.
+   From lm_interface.h:
+#define LM_FLAG_TRY            0x00000001
+#define LM_FLAG_TRY_1CB                0x00000002
+#define LM_FLAG_NOEXP          0x00000004
+#define LM_FLAG_ANY            0x00000008
+#define LM_FLAG_PRIORITY       0x00000010 */
+
+#define GL_ASYNC               0x00000040
+#define GL_EXACT               0x00000080
+#define GL_SKIP                        0x00000100
+#define GL_ATIME               0x00000200
+#define GL_NOCACHE             0x00000400
+#define GL_NOCANCEL            0x00001000
+
+#define GLR_TRYFAILED          13
+#define GLR_CANCELED           14
+
+static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
+{
+       struct gfs2_holder *gh;
+       int locked = 0;
+
+       /* Look in glock's list of holders for one with current task as owner */
+       spin_lock(&gl->gl_spin);
+       list_for_each_entry(gh, &gl->gl_holders, gh_list) {
+               if (gh->gh_owner_pid == current->pid) {
+                       locked = 1;
+                       break;
+               }
+       }
+       spin_unlock(&gl->gl_spin);
+
+       return locked;
+}
+
+static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
+{
+       return gl->gl_state == LM_ST_EXCLUSIVE;
+}
+
+static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
+{
+       return gl->gl_state == LM_ST_DEFERRED;
+}
+
+static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
+{
+       return gl->gl_state == LM_ST_SHARED;
+}
+
+static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
+{
+       int ret;
+       spin_lock(&gl->gl_spin);
+       ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3);
+       spin_unlock(&gl->gl_spin);
+       return ret;
+}
+
+int gfs2_glock_get(struct gfs2_sbd *sdp,
+                  u64 number, const struct gfs2_glock_operations *glops,
+                  int create, struct gfs2_glock **glp);
+void gfs2_glock_hold(struct gfs2_glock *gl);
+int gfs2_glock_put(struct gfs2_glock *gl);
+void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
+                     struct gfs2_holder *gh);
+void gfs2_holder_reinit(unsigned int state, unsigned flags,
+                       struct gfs2_holder *gh);
+void gfs2_holder_uninit(struct gfs2_holder *gh);
+int gfs2_glock_nq(struct gfs2_holder *gh);
+int gfs2_glock_poll(struct gfs2_holder *gh);
+int gfs2_glock_wait(struct gfs2_holder *gh);
+void gfs2_glock_dq(struct gfs2_holder *gh);
+
+void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
+int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
+                     u64 number, const struct gfs2_glock_operations *glops,
+                     unsigned int state, int flags, struct gfs2_holder *gh);
+
+int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
+void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
+void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
+
+/**
+ * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
+ * @gl: the glock
+ * @state: the state we're requesting
+ * @flags: the modifier flags
+ * @gh: the holder structure
+ *
+ * Returns: 0, GLR_*, or errno
+ */
+
+static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
+                                    unsigned int state, int flags,
+                                    struct gfs2_holder *gh)
+{
+       int error;
+
+       gfs2_holder_init(gl, state, flags, gh);
+
+       error = gfs2_glock_nq(gh);
+       if (error)
+               gfs2_holder_uninit(gh);
+
+       return error;
+}
+
+/*  Lock Value Block functions  */
+
+int gfs2_lvb_hold(struct gfs2_glock *gl);
+void gfs2_lvb_unhold(struct gfs2_glock *gl);
+
+void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
+
+void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
+void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
+
+void gfs2_scand_internal(struct gfs2_sbd *sdp);
+void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
+
+int __init gfs2_glock_init(void);
+int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
+void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
+int gfs2_register_debugfs(void);
+void gfs2_unregister_debugfs(void);
+
+#endif /* __GLOCK_DOT_H__ */