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_LOCAL_EXCL 0x00000020 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 #define GL_AOP 0x00004000 31 #define GL_DUMP 0x00008000 32 33 #define GLR_TRYFAILED 13 34 #define GLR_CANCELED 14 35 36 static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 37 { 38 struct gfs2_holder *gh; 39 int locked = 0; 40 41 /* Look in glock's list of holders for one with current task as owner */ 42 spin_lock(&gl->gl_spin); 43 list_for_each_entry(gh, &gl->gl_holders, gh_list) { 44 if (gh->gh_owner == current) { 45 locked = 1; 46 break; 47 } 48 } 49 spin_unlock(&gl->gl_spin); 50 51 return locked; 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 = !list_empty(&gl->gl_waiters2) || !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 void gfs2_glock_hold(struct gfs2_glock *gl); 82 int gfs2_glock_put(struct gfs2_glock *gl); 83 void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, 84 struct gfs2_holder *gh); 85 void gfs2_holder_reinit(unsigned int state, unsigned flags, 86 struct gfs2_holder *gh); 87 void gfs2_holder_uninit(struct gfs2_holder *gh); 88 89 void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags); 90 void gfs2_glock_drop_th(struct gfs2_glock *gl); 91 92 int gfs2_glock_nq(struct gfs2_holder *gh); 93 int gfs2_glock_poll(struct gfs2_holder *gh); 94 int gfs2_glock_wait(struct gfs2_holder *gh); 95 void gfs2_glock_dq(struct gfs2_holder *gh); 96 97 int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time); 98 99 void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 100 int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 101 u64 number, const struct gfs2_glock_operations *glops, 102 unsigned int state, int flags, struct gfs2_holder *gh); 103 104 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 105 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 106 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 107 108 void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number, 109 const struct gfs2_glock_operations *glops, 110 unsigned int state, int flags); 111 void gfs2_glock_inode_squish(struct inode *inode); 112 113 /** 114 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 115 * @gl: the glock 116 * @state: the state we're requesting 117 * @flags: the modifier flags 118 * @gh: the holder structure 119 * 120 * Returns: 0, GLR_*, or errno 121 */ 122 123 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 124 unsigned int state, int flags, 125 struct gfs2_holder *gh) 126 { 127 int error; 128 129 gfs2_holder_init(gl, state, flags, gh); 130 131 error = gfs2_glock_nq(gh); 132 if (error) 133 gfs2_holder_uninit(gh); 134 135 return error; 136 } 137 138 /* Lock Value Block functions */ 139 140 int gfs2_lvb_hold(struct gfs2_glock *gl); 141 void gfs2_lvb_unhold(struct gfs2_glock *gl); 142 143 void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 144 145 void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); 146 void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 147 148 void gfs2_scand_internal(struct gfs2_sbd *sdp); 149 void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); 150 151 int __init gfs2_glock_init(void); 152 153 #endif /* __GLOCK_DOT_H__ */ 154