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_NOCANCEL 0x00001000 30 31 #define GLR_TRYFAILED 13 32 #define GLR_CANCELED 14 33 34 static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 35 { 36 struct gfs2_holder *gh; 37 int locked = 0; 38 39 /* Look in glock's list of holders for one with current task as owner */ 40 spin_lock(&gl->gl_spin); 41 list_for_each_entry(gh, &gl->gl_holders, gh_list) { 42 if (gh->gh_owner_pid == current->pid) { 43 locked = 1; 44 break; 45 } 46 } 47 spin_unlock(&gl->gl_spin); 48 49 return locked; 50 } 51 52 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) 53 { 54 return gl->gl_state == LM_ST_EXCLUSIVE; 55 } 56 57 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) 58 { 59 return gl->gl_state == LM_ST_DEFERRED; 60 } 61 62 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) 63 { 64 return gl->gl_state == LM_ST_SHARED; 65 } 66 67 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) 68 { 69 int ret; 70 spin_lock(&gl->gl_spin); 71 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3); 72 spin_unlock(&gl->gl_spin); 73 return ret; 74 } 75 76 int gfs2_glock_get(struct gfs2_sbd *sdp, 77 u64 number, const struct gfs2_glock_operations *glops, 78 int create, struct gfs2_glock **glp); 79 void gfs2_glock_hold(struct gfs2_glock *gl); 80 int gfs2_glock_put(struct gfs2_glock *gl); 81 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, 82 struct gfs2_holder *gh); 83 void gfs2_holder_reinit(unsigned int state, unsigned flags, 84 struct gfs2_holder *gh); 85 void gfs2_holder_uninit(struct gfs2_holder *gh); 86 int gfs2_glock_nq(struct gfs2_holder *gh); 87 int gfs2_glock_poll(struct gfs2_holder *gh); 88 int gfs2_glock_wait(struct gfs2_holder *gh); 89 void gfs2_glock_dq(struct gfs2_holder *gh); 90 void gfs2_glock_dq_wait(struct gfs2_holder *gh); 91 92 void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 93 int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 94 u64 number, const struct gfs2_glock_operations *glops, 95 unsigned int state, int flags, struct gfs2_holder *gh); 96 97 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 98 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 99 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 100 101 /** 102 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 103 * @gl: the glock 104 * @state: the state we're requesting 105 * @flags: the modifier flags 106 * @gh: the holder structure 107 * 108 * Returns: 0, GLR_*, or errno 109 */ 110 111 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 112 unsigned int state, int flags, 113 struct gfs2_holder *gh) 114 { 115 int error; 116 117 gfs2_holder_init(gl, state, flags, gh); 118 119 error = gfs2_glock_nq(gh); 120 if (error) 121 gfs2_holder_uninit(gh); 122 123 return error; 124 } 125 126 /* Lock Value Block functions */ 127 128 int gfs2_lvb_hold(struct gfs2_glock *gl); 129 void gfs2_lvb_unhold(struct gfs2_glock *gl); 130 131 void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 132 133 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); 134 void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 135 136 void gfs2_scand_internal(struct gfs2_sbd *sdp); 137 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); 138 139 int __init gfs2_glock_init(void); 140 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); 141 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); 142 int gfs2_register_debugfs(void); 143 void gfs2_unregister_debugfs(void); 144 145 #endif /* __GLOCK_DOT_H__ */ 146