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 int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 36 { 37 struct gfs2_holder *gh; 38 int locked = 0; 39 struct pid *pid; 40 41 /* Look in glock's list of holders for one with current task as owner */ 42 spin_lock(&gl->gl_spin); 43 pid = task_pid(current); 44 list_for_each_entry(gh, &gl->gl_holders, gh_list) { 45 if (gh->gh_owner_pid == pid) { 46 locked = 1; 47 break; 48 } 49 } 50 spin_unlock(&gl->gl_spin); 51 52 return locked; 53 } 54 55 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) 56 { 57 return gl->gl_state == LM_ST_EXCLUSIVE; 58 } 59 60 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) 61 { 62 return gl->gl_state == LM_ST_DEFERRED; 63 } 64 65 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) 66 { 67 return gl->gl_state == LM_ST_SHARED; 68 } 69 70 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) 71 { 72 int ret; 73 spin_lock(&gl->gl_spin); 74 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3); 75 spin_unlock(&gl->gl_spin); 76 return ret; 77 } 78 79 int gfs2_glock_get(struct gfs2_sbd *sdp, 80 u64 number, const struct gfs2_glock_operations *glops, 81 int create, struct gfs2_glock **glp); 82 void gfs2_glock_hold(struct gfs2_glock *gl); 83 int gfs2_glock_put(struct gfs2_glock *gl); 84 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, 85 struct gfs2_holder *gh); 86 void gfs2_holder_reinit(unsigned int state, unsigned flags, 87 struct gfs2_holder *gh); 88 void gfs2_holder_uninit(struct gfs2_holder *gh); 89 int gfs2_glock_nq(struct gfs2_holder *gh); 90 int gfs2_glock_poll(struct gfs2_holder *gh); 91 int gfs2_glock_wait(struct gfs2_holder *gh); 92 void gfs2_glock_dq(struct gfs2_holder *gh); 93 void gfs2_glock_dq_wait(struct gfs2_holder *gh); 94 95 void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 96 int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 97 u64 number, const struct gfs2_glock_operations *glops, 98 unsigned int state, int flags, struct gfs2_holder *gh); 99 100 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 101 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 102 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 103 104 /** 105 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 106 * @gl: the glock 107 * @state: the state we're requesting 108 * @flags: the modifier flags 109 * @gh: the holder structure 110 * 111 * Returns: 0, GLR_*, or errno 112 */ 113 114 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 115 unsigned int state, int flags, 116 struct gfs2_holder *gh) 117 { 118 int error; 119 120 gfs2_holder_init(gl, state, flags, gh); 121 122 error = gfs2_glock_nq(gh); 123 if (error) 124 gfs2_holder_uninit(gh); 125 126 return error; 127 } 128 129 /* Lock Value Block functions */ 130 131 int gfs2_lvb_hold(struct gfs2_glock *gl); 132 void gfs2_lvb_unhold(struct gfs2_glock *gl); 133 134 void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 135 136 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); 137 void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 138 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); 139 140 int __init gfs2_glock_init(void); 141 void gfs2_glock_exit(void); 142 143 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); 144 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); 145 int gfs2_register_debugfs(void); 146 void gfs2_unregister_debugfs(void); 147 148 #endif /* __GLOCK_DOT_H__ */ 149