[GFS2] The core of GFS2

This patch contains all the core files for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 143 insertions, 0 deletions

diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
new file mode 100644
index 0000000..06847eb
--- /dev/null
+++ b/fs/gfs2/glock.h
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#ifndef __GLOCK_DOT_H__
+#define __GLOCK_DOT_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_LOCAL_EXCL		0x00000020
+#define GL_ASYNC		0x00000040
+#define GL_EXACT		0x00000080
+#define GL_SKIP			0x00000100
+#define GL_ATIME		0x00000200
+#define GL_NOCACHE		0x00000400
+#define GL_SYNC			0x00000800
+#define GL_NOCANCEL		0x00001000
+#define GL_NEVER_RECURSE	0x00002000
+
+#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 == current) {
+			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 = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
+	spin_unlock(&gl->gl_spin);
+	return ret;
+}
+
+struct gfs2_glock *gfs2_glock_find(struct gfs2_sbd *sdp,
+				   struct lm_lockname *name);
+int gfs2_glock_get(struct gfs2_sbd *sdp,
+		   uint64_t number, 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, int flags,
+		      struct gfs2_holder *gh);
+void gfs2_holder_reinit(unsigned int state, int flags, struct gfs2_holder *gh);
+void gfs2_holder_uninit(struct gfs2_holder *gh);
+struct gfs2_holder *gfs2_holder_get(struct gfs2_glock *gl, unsigned int state,
+				    int flags, gfp_t gfp_flags);
+void gfs2_holder_put(struct gfs2_holder *gh);
+
+void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
+void gfs2_glock_drop_th(struct gfs2_glock *gl);
+
+void gfs2_glmutex_lock(struct gfs2_glock *gl);
+int gfs2_glmutex_trylock(struct gfs2_glock *gl);
+void gfs2_glmutex_unlock(struct gfs2_glock *gl);
+
+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_prefetch(struct gfs2_glock *gl, unsigned int state, int flags);
+void gfs2_glock_force_drop(struct gfs2_glock *gl);
+
+int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
+
+int gfs2_glock_nq_init(struct gfs2_glock *gl, unsigned int state, int flags,
+		       struct gfs2_holder *gh);
+void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
+int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
+		      uint64_t number, 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);
+
+void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number,
+			     struct gfs2_glock_operations *glops,
+			     unsigned int state, int flags);
+
+/*  Lock Value Block functions  */
+
+int gfs2_lvb_hold(struct gfs2_glock *gl);
+void gfs2_lvb_unhold(struct gfs2_glock *gl);
+void gfs2_lvb_sync(struct gfs2_glock *gl);
+
+void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data);
+
+void gfs2_try_toss_inode(struct gfs2_sbd *sdp, struct gfs2_inum *inum);
+void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
+
+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 gfs2_dump_lockstate(struct gfs2_sbd *sdp);
+
+#endif /* __GLOCK_DOT_H__ */