1b3b94faaSDavid Teigland /* 2b3b94faaSDavid Teigland * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 33a8a9a10SSteven Whitehouse * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4b3b94faaSDavid Teigland * 5b3b94faaSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 6b3b94faaSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 7e9fc2aa0SSteven Whitehouse * of the GNU General Public License version 2. 8b3b94faaSDavid Teigland */ 9b3b94faaSDavid Teigland 10b3b94faaSDavid Teigland #ifndef __GLOCK_DOT_H__ 11b3b94faaSDavid Teigland #define __GLOCK_DOT_H__ 12b3b94faaSDavid Teigland 13e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 14f2f7ba52SSteven Whitehouse #include "incore.h" 15f2f7ba52SSteven Whitehouse 16b3b94faaSDavid Teigland /* Flags for lock requests; used in gfs2_holder gh_flag field. 17b3b94faaSDavid Teigland From lm_interface.h: 18b3b94faaSDavid Teigland #define LM_FLAG_TRY 0x00000001 19b3b94faaSDavid Teigland #define LM_FLAG_TRY_1CB 0x00000002 20b3b94faaSDavid Teigland #define LM_FLAG_NOEXP 0x00000004 21b3b94faaSDavid Teigland #define LM_FLAG_ANY 0x00000008 22b3b94faaSDavid Teigland #define LM_FLAG_PRIORITY 0x00000010 */ 23b3b94faaSDavid Teigland 24b3b94faaSDavid Teigland #define GL_ASYNC 0x00000040 25b3b94faaSDavid Teigland #define GL_EXACT 0x00000080 26b3b94faaSDavid Teigland #define GL_SKIP 0x00000100 27b3b94faaSDavid Teigland #define GL_ATIME 0x00000200 28b3b94faaSDavid Teigland #define GL_NOCACHE 0x00000400 29b3b94faaSDavid Teigland 30b3b94faaSDavid Teigland #define GLR_TRYFAILED 13 31b3b94faaSDavid Teigland 327afd88d9SSteven Whitehouse static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) 33b3b94faaSDavid Teigland { 34b3b94faaSDavid Teigland struct gfs2_holder *gh; 35b1e058daSPavel Emelyanov struct pid *pid; 36b3b94faaSDavid Teigland 37b3b94faaSDavid Teigland /* Look in glock's list of holders for one with current task as owner */ 38b3b94faaSDavid Teigland spin_lock(&gl->gl_spin); 39b1e058daSPavel Emelyanov pid = task_pid(current); 40b3b94faaSDavid Teigland list_for_each_entry(gh, &gl->gl_holders, gh_list) { 416802e340SSteven Whitehouse if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) 426802e340SSteven Whitehouse break; 437afd88d9SSteven Whitehouse if (gh->gh_owner_pid == pid) 447afd88d9SSteven Whitehouse goto out; 45b3b94faaSDavid Teigland } 467afd88d9SSteven Whitehouse gh = NULL; 477afd88d9SSteven Whitehouse out: 48b3b94faaSDavid Teigland spin_unlock(&gl->gl_spin); 49b3b94faaSDavid Teigland 507afd88d9SSteven Whitehouse return gh; 51b3b94faaSDavid Teigland } 52b3b94faaSDavid Teigland 53b3b94faaSDavid Teigland static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) 54b3b94faaSDavid Teigland { 5550299965SSteven Whitehouse return gl->gl_state == LM_ST_EXCLUSIVE; 56b3b94faaSDavid Teigland } 57b3b94faaSDavid Teigland 58b3b94faaSDavid Teigland static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) 59b3b94faaSDavid Teigland { 6050299965SSteven Whitehouse return gl->gl_state == LM_ST_DEFERRED; 61b3b94faaSDavid Teigland } 62b3b94faaSDavid Teigland 63b3b94faaSDavid Teigland static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) 64b3b94faaSDavid Teigland { 6550299965SSteven Whitehouse return gl->gl_state == LM_ST_SHARED; 66b3b94faaSDavid Teigland } 67b3b94faaSDavid Teigland 68b3b94faaSDavid Teigland static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) 69b3b94faaSDavid Teigland { 70b3b94faaSDavid Teigland int ret; 71b3b94faaSDavid Teigland spin_lock(&gl->gl_spin); 726802e340SSteven Whitehouse ret = test_bit(GLF_DEMOTE, &gl->gl_flags); 73b3b94faaSDavid Teigland spin_unlock(&gl->gl_spin); 74b3b94faaSDavid Teigland return ret; 75b3b94faaSDavid Teigland } 76b3b94faaSDavid Teigland 77b3b94faaSDavid Teigland int gfs2_glock_get(struct gfs2_sbd *sdp, 78cd915493SSteven Whitehouse u64 number, const struct gfs2_glock_operations *glops, 79b3b94faaSDavid Teigland int create, struct gfs2_glock **glp); 80b3b94faaSDavid Teigland int gfs2_glock_put(struct gfs2_glock *gl); 81190562bdSSteven Whitehouse void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, 82b3b94faaSDavid Teigland struct gfs2_holder *gh); 83190562bdSSteven Whitehouse void gfs2_holder_reinit(unsigned int state, unsigned flags, 84190562bdSSteven Whitehouse struct gfs2_holder *gh); 85b3b94faaSDavid Teigland void gfs2_holder_uninit(struct gfs2_holder *gh); 86b3b94faaSDavid Teigland int gfs2_glock_nq(struct gfs2_holder *gh); 87b3b94faaSDavid Teigland int gfs2_glock_poll(struct gfs2_holder *gh); 88b3b94faaSDavid Teigland int gfs2_glock_wait(struct gfs2_holder *gh); 89b3b94faaSDavid Teigland void gfs2_glock_dq(struct gfs2_holder *gh); 90d93cfa98SAbhijith Das void gfs2_glock_dq_wait(struct gfs2_holder *gh); 91b3b94faaSDavid Teigland 92b3b94faaSDavid Teigland void gfs2_glock_dq_uninit(struct gfs2_holder *gh); 93b3b94faaSDavid Teigland int gfs2_glock_nq_num(struct gfs2_sbd *sdp, 94cd915493SSteven Whitehouse u64 number, const struct gfs2_glock_operations *glops, 95b3b94faaSDavid Teigland unsigned int state, int flags, struct gfs2_holder *gh); 96b3b94faaSDavid Teigland 97b3b94faaSDavid Teigland int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); 98b3b94faaSDavid Teigland void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); 99b3b94faaSDavid Teigland void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); 1006802e340SSteven Whitehouse void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); 101b3b94faaSDavid Teigland 102d0dc80dbSSteven Whitehouse /** 103d0dc80dbSSteven Whitehouse * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock 104d0dc80dbSSteven Whitehouse * @gl: the glock 105d0dc80dbSSteven Whitehouse * @state: the state we're requesting 106d0dc80dbSSteven Whitehouse * @flags: the modifier flags 107d0dc80dbSSteven Whitehouse * @gh: the holder structure 108d0dc80dbSSteven Whitehouse * 109d0dc80dbSSteven Whitehouse * Returns: 0, GLR_*, or errno 110d0dc80dbSSteven Whitehouse */ 111d0dc80dbSSteven Whitehouse 112d0dc80dbSSteven Whitehouse static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, 113d0dc80dbSSteven Whitehouse unsigned int state, int flags, 114d0dc80dbSSteven Whitehouse struct gfs2_holder *gh) 115d0dc80dbSSteven Whitehouse { 116d0dc80dbSSteven Whitehouse int error; 117d0dc80dbSSteven Whitehouse 118d0dc80dbSSteven Whitehouse gfs2_holder_init(gl, state, flags, gh); 119d0dc80dbSSteven Whitehouse 120d0dc80dbSSteven Whitehouse error = gfs2_glock_nq(gh); 121d0dc80dbSSteven Whitehouse if (error) 122d0dc80dbSSteven Whitehouse gfs2_holder_uninit(gh); 123d0dc80dbSSteven Whitehouse 124d0dc80dbSSteven Whitehouse return error; 125d0dc80dbSSteven Whitehouse } 126d0dc80dbSSteven Whitehouse 127b3b94faaSDavid Teigland /* Lock Value Block functions */ 128b3b94faaSDavid Teigland 129b3b94faaSDavid Teigland int gfs2_lvb_hold(struct gfs2_glock *gl); 130b3b94faaSDavid Teigland void gfs2_lvb_unhold(struct gfs2_glock *gl); 131b3b94faaSDavid Teigland 1329b47c11dSSteven Whitehouse void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 133b3b94faaSDavid Teigland void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); 134b3b94faaSDavid Teigland void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 1351bdad606SSteven Whitehouse void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); 136b3b94faaSDavid Teigland 13785d1da67SSteven Whitehouse int __init gfs2_glock_init(void); 1388fbbfd21SSteven Whitehouse void gfs2_glock_exit(void); 1398fbbfd21SSteven Whitehouse 1407c52b166SRobert Peterson int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); 1417c52b166SRobert Peterson void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); 1427c52b166SRobert Peterson int gfs2_register_debugfs(void); 1437c52b166SRobert Peterson void gfs2_unregister_debugfs(void); 14485d1da67SSteven Whitehouse 145b3b94faaSDavid Teigland #endif /* __GLOCK_DOT_H__ */ 146