1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #ifndef __GLOCK_DOT_H__ 11 #define __GLOCK_DOT_H__ 12 13 #include <linux/sched.h> 14 #include "incore.h" 15 16 /* Flags for lock requests; used in gfs2_holder gh_flag field. 17 From lm_interface.h: 18 #define LM_FLAG_TRY 0x00000001 19 #define LM_FLAG_TRY_1CB 0x00000002 20 #define LM_FLAG_NOEXP 0x00000004 21 #define LM_FLAG_ANY 0x00000008 22 #define LM_FLAG_PRIORITY 0x00000010 */ 23 24 #define GL_ASYNC 0x00000040 25 #define GL_EXACT 0x00000080 26 #define GL_SKIP 0x00000100 27 #define GL_ATIME 0x00000200 28 #define GL_NOCACHE 0x00000400 29 #define GL_FLOCK 0x00000800 30 #define GL_NOCANCEL 0x00001000 31 32 #define GLR_TRYFAILED 13 33 #define GLR_CANCELED 14 34 35 static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 36 { 37 struct gfs2_holder *gh; 38 struct pid *pid; 39 40 /* Look in glock's list of holders for one with current task as owner */ 41 spin_lock(&gl->gl_spin); 42 pid = task_pid(current); 43 list_for_each_entry(gh, &gl->gl_holders, gh_list) { 44 if (gh->gh_owner_pid == pid) 45 goto out; 46 } 47 gh = NULL; 48 out: 49 spin_unlock(&gl->gl_spin); 50 51 return gh; 52 } 53 54 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) 55 { 56 return gl->gl_state == LM_ST_EXCLUSIVE; 57 } 58 59 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) 60 { 61 return gl->gl_state == LM_ST_DEFERRED; 62 } 63 64 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) 65 { 66 return gl->gl_state == LM_ST_SHARED; 67 } 68 69 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) 70 { 71 int ret; 72 spin_lock(&gl->gl_spin); 73 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3); 74 spin_unlock(&gl->gl_spin); 75 return ret; 76 } 77 78 int gfs2_glock_get(struct gfs2_sbd *sdp, 79 u64 number, const struct gfs2_glock_operations *glops, 80 int create, struct gfs2_glock **glp); 81 int gfs2_glock_put(struct gfs2_glock *gl); 82 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, 83 struct gfs2_holder *gh); 84 void gfs2_holder_reinit(unsigned int state, unsigned flags, 85 struct gfs2_holder *gh); 86 void gfs2_holder_uninit(struct gfs2_holder *gh); 87 int gfs2_glock_nq(struct gfs2_holder *gh); 88 int gfs2_glock_poll(struct gfs2_holder *gh); 89 int gfs2_glock_wait(struct gfs2_holder *gh); 90 void gfs2_glock_dq(struct gfs2_holder *gh); 91 void gfs2_glock_dq_wait(struct gfs2_holder *gh); 92 93 void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 94 int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 95 u64 number, const struct gfs2_glock_operations *glops, 96 unsigned int state, int flags, struct gfs2_holder *gh); 97 98 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 99 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 100 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 101 102 /** 103 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 104 * @gl: the glock 105 * @state: the state we're requesting 106 * @flags: the modifier flags 107 * @gh: the holder structure 108 * 109 * Returns: 0, GLR_*, or errno 110 */ 111 112 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 113 unsigned int state, int flags, 114 struct gfs2_holder *gh) 115 { 116 int error; 117 118 gfs2_holder_init(gl, state, flags, gh); 119 120 error = gfs2_glock_nq(gh); 121 if (error) 122 gfs2_holder_uninit(gh); 123 124 return error; 125 } 126 127 /* Lock Value Block functions */ 128 129 int gfs2_lvb_hold(struct gfs2_glock *gl); 130 void gfs2_lvb_unhold(struct gfs2_glock *gl); 131 132 void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 133 134 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); 135 void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 136 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); 137 138 int __init gfs2_glock_init(void); 139 void gfs2_glock_exit(void); 140 141 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); 142 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); 143 int gfs2_register_debugfs(void); 144 void gfs2_unregister_debugfs(void); 145 146 #endif /* __GLOCK_DOT_H__ */ 147