| /* |
| * 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 <linux/sched.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 GLR_TRYFAILED 13 |
| |
| static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) |
| { |
| struct gfs2_holder *gh; |
| struct pid *pid; |
| |
| /* Look in glock's list of holders for one with current task as owner */ |
| spin_lock(&gl->gl_spin); |
| pid = task_pid(current); |
| list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
| if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) |
| break; |
| if (gh->gh_owner_pid == pid) |
| goto out; |
| } |
| gh = NULL; |
| out: |
| spin_unlock(&gl->gl_spin); |
| |
| return gh; |
| } |
| |
| 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); |
| 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); |
| 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_wait(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); |
| void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); |
| |
| /** |
| * 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_gl_hash_clear(struct gfs2_sbd *sdp, int wait); |
| |
| int __init gfs2_glock_init(void); |
| void gfs2_glock_exit(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__ */ |