/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License version 2. */ #ifndef __GLOCK_DOT_H__ #define __GLOCK_DOT_H__ #include <linux/sched.h> #include "incore.h" /* Flags for lock requests; used in gfs2_holder gh_flag field. From lm_interface.h: #define LM_FLAG_TRY 0x00000001 #define LM_FLAG_TRY_1CB 0x00000002 #define LM_FLAG_NOEXP 0x00000004 #define LM_FLAG_ANY 0x00000008 #define LM_FLAG_PRIORITY 0x00000010 */ #define GL_ASYNC 0x00000040 #define GL_EXACT 0x00000080 #define GL_SKIP 0x00000100 #define GL_ATIME 0x00000200 #define GL_NOCACHE 0x00000400 #define GLR_TRYFAILED 13 static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) { struct gfs2_holder *gh; struct pid *pid; /* Look in glock's list of holders for one with current task as owner */ spin_lock(&gl->gl_spin); pid = task_pid(current); list_for_each_entry(gh, &gl->gl_holders, gh_list) { if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) break; if (gh->gh_owner_pid == pid) goto out; } gh = NULL; out: spin_unlock(&gl->gl_spin); return gh; } static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) { return gl->gl_state == LM_ST_EXCLUSIVE; } static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) { return gl->gl_state == LM_ST_DEFERRED; } static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) { return gl->gl_state == LM_ST_SHARED; } static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl) { int ret; spin_lock(&gl->gl_spin); ret = test_bit(GLF_DEMOTE, &gl->gl_flags); spin_unlock(&gl->gl_spin); return ret; } int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, const struct gfs2_glock_operations *glops, int create, struct gfs2_glock **glp); int gfs2_glock_put(struct gfs2_glock *gl); void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags, struct gfs2_holder *gh); void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *gh); void gfs2_holder_uninit(struct gfs2_holder *gh); int gfs2_glock_nq(struct gfs2_holder *gh); int gfs2_glock_poll(struct gfs2_holder *gh); int gfs2_glock_wait(struct gfs2_holder *gh); void gfs2_glock_dq(struct gfs2_holder *gh); void gfs2_glock_dq_wait(struct gfs2_holder *gh); void gfs2_glock_dq_uninit(struct gfs2_holder *gh); int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, const struct gfs2_glock_operations *glops, unsigned int state, int flags, struct gfs2_holder *gh); int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs); void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); /** * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock * @gl: the glock * @state: the state we're requesting * @flags: the modifier flags * @gh: the holder structure * * Returns: 0, GLR_*, or errno */ static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, unsigned int state, int flags, struct gfs2_holder *gh) { int error; gfs2_holder_init(gl, state, flags, gh); error = gfs2_glock_nq(gh); if (error) gfs2_holder_uninit(gh); return error; } /* Lock Value Block functions */ int gfs2_lvb_hold(struct gfs2_glock *gl); void gfs2_lvb_unhold(struct gfs2_glock *gl); void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); void gfs2_reclaim_glock(struct gfs2_sbd *sdp); void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); int __init gfs2_glock_init(void); void gfs2_glock_exit(void); int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); int gfs2_register_debugfs(void); void gfs2_unregister_debugfs(void); #endif /* __GLOCK_DOT_H__ */