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 /* Flags for lock requests; used in gfs2_holder gh_flag field. 14 From lm_interface.h: 15 #define LM_FLAG_TRY 0x00000001 16 #define LM_FLAG_TRY_1CB 0x00000002 17 #define LM_FLAG_NOEXP 0x00000004 18 #define LM_FLAG_ANY 0x00000008 19 #define LM_FLAG_PRIORITY 0x00000010 */ 20 21 #define GL_LOCAL_EXCL 0x00000020 22 #define GL_ASYNC 0x00000040 23 #define GL_EXACT 0x00000080 24 #define GL_SKIP 0x00000100 25 #define GL_ATIME 0x00000200 26 #define GL_NOCACHE 0x00000400 27 #define GL_NOCANCEL 0x00001000 28 #define GL_AOP 0x00004000 29 #define GL_DUMP 0x00008000 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 == current) { 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 = !list_empty(&gl->gl_waiters2) || !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 uint64_t 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 87 void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags); 88 void gfs2_glock_drop_th(struct gfs2_glock *gl); 89 90 int gfs2_glock_nq(struct gfs2_holder *gh); 91 int gfs2_glock_poll(struct gfs2_holder *gh); 92 int gfs2_glock_wait(struct gfs2_holder *gh); 93 void gfs2_glock_dq(struct gfs2_holder *gh); 94 95 int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time); 96 97 void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 98 int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 99 uint64_t number, const struct gfs2_glock_operations *glops, 100 unsigned int state, int flags, struct gfs2_holder *gh); 101 102 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 103 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 104 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 105 106 void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, uint64_t number, 107 const struct gfs2_glock_operations *glops, 108 unsigned int state, int flags); 109 void gfs2_glock_inode_squish(struct inode *inode); 110 111 /** 112 * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 113 * @gl: the glock 114 * @state: the state we're requesting 115 * @flags: the modifier flags 116 * @gh: the holder structure 117 * 118 * Returns: 0, GLR_*, or errno 119 */ 120 121 static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 122 unsigned int state, int flags, 123 struct gfs2_holder *gh) 124 { 125 int error; 126 127 gfs2_holder_init(gl, state, flags, gh); 128 129 error = gfs2_glock_nq(gh); 130 if (error) 131 gfs2_holder_uninit(gh); 132 133 return error; 134 } 135 136 /* Lock Value Block functions */ 137 138 int gfs2_lvb_hold(struct gfs2_glock *gl); 139 void gfs2_lvb_unhold(struct gfs2_glock *gl); 140 141 void gfs2_glock_cb(lm_fsdata_t *fsdata, unsigned int type, void *data); 142 143 void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state); 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 #endif /* __GLOCK_DOT_H__ */ 152