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 "incore.h" 14 15 /* Flags for lock requests; used in gfs2_holder gh_flag field. 16 From lm_interface.h: 17 #define LM_FLAG_TRY 0x00000001 18 #define LM_FLAG_TRY_1CB 0x00000002 19 #define LM_FLAG_NOEXP 0x00000004 20 #define LM_FLAG_ANY 0x00000008 21 #define LM_FLAG_PRIORITY 0x00000010 */ 22 23 #define GL_ASYNC 0x00000040 24 #define GL_EXACT 0x00000080 25 #define GL_SKIP 0x00000100 26 #define GL_ATIME 0x00000200 27 #define GL_NOCACHE 0x00000400 28 #define GL_NOCANCEL 0x00001000 29 30 #define GLR_TRYFAILED 13 31 #define GLR_CANCELED 14 32 33 static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 34 { 35 struct gfs2_holder *gh; 36 int locked = 0; 37 38 /* Look in glock's list of holders for one with current task as owner */ 39 spin_lock(&gl->gl_spin); 40 list_for_each_entry(gh, &gl->gl_holders, gh_list) { 41 if (gh->gh_owner_pid == current->pid) { 42 locked = 1; 43 break; 44 } 45 } 46 spin_unlock(&gl->gl_spin); 47 48 return locked; 49 } 50 51 static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) 52 { 53 return gl->gl_state == LM_ST_EXCLUSIVE; 54 } 55 56 static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) 57 { 58 return gl->gl_state == LM_ST_DEFERRED; 59 } 60 61 static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) 62 { 63 return gl->gl_state == LM_ST_SHARED; 64 } 65 66 static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) 67 { 68 int ret; 69 spin_lock(&gl->gl_spin); 70 ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3); 71 spin_unlock(&gl->gl_spin); 72 return ret; 73 } 74 75 int gfs2_glock_get(struct gfs2_sbd *sdp, 76 u64 number, const struct gfs2_glock_operations *glops, 77 int create, struct gfs2_glock **glp); 78 void gfs2_glock_hold(struct gfs2_glock *gl); 79 int gfs2_glock_put(struct gfs2_glock *gl); 80 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, 81 struct gfs2_holder *gh); 82 void gfs2_holder_reinit(unsigned int state, unsigned flags, 83 struct gfs2_holder *gh); 84 void gfs2_holder_uninit(struct gfs2_holder *gh); 85 int gfs2_glock_nq(struct gfs2_holder *gh); 86 int gfs2_glock_poll(struct gfs2_holder *gh); 87 int gfs2_glock_wait(struct gfs2_holder *gh); 88 void gfs2_glock_dq(struct gfs2_holder *gh); 89 90 void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 91 int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 92 u64 number, const struct gfs2_glock_operations *glops, 93 unsigned int state, int flags, struct gfs2_holder *gh); 94 95 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 96 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 97 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 98 99 /** 100 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 101 * @gl: the glock 102 * @state: the state we're requesting 103 * @flags: the modifier flags 104 * @gh: the holder structure 105 * 106 * Returns: 0, GLR_*, or errno 107 */ 108 109 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 110 unsigned int state, int flags, 111 struct gfs2_holder *gh) 112 { 113 int error; 114 115 gfs2_holder_init(gl, state, flags, gh); 116 117 error = gfs2_glock_nq(gh); 118 if (error) 119 gfs2_holder_uninit(gh); 120 121 return error; 122 } 123 124 /* Lock Value Block functions */ 125 126 int gfs2_lvb_hold(struct gfs2_glock *gl); 127 void gfs2_lvb_unhold(struct gfs2_glock *gl); 128 129 void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 130 131 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); 132 void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 133 134 void gfs2_scand_internal(struct gfs2_sbd *sdp); 135 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); 136 137 int __init gfs2_glock_init(void); 138 int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); 139 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); 140 int gfs2_register_debugfs(void); 141 void gfs2_unregister_debugfs(void); 142 143 #endif /* __GLOCK_DOT_H__ */ 144