2006-01-16 23:50:04 +07:00
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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2006-05-19 02:09:15 +07:00
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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2006-01-16 23:50:04 +07:00
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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2006-09-01 22:05:15 +07:00
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* of the GNU General Public License version 2.
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2006-01-16 23:50:04 +07:00
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*/
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#ifndef __GLOCK_DOT_H__
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#define __GLOCK_DOT_H__
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-21 04:22:52 +07:00
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#include <linux/sched.h>
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2006-09-05 21:39:21 +07:00
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#include "incore.h"
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2006-01-16 23:50:04 +07:00
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/* Flags for lock requests; used in gfs2_holder gh_flag field.
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From lm_interface.h:
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#define LM_FLAG_TRY 0x00000001
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#define LM_FLAG_TRY_1CB 0x00000002
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#define LM_FLAG_NOEXP 0x00000004
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#define LM_FLAG_ANY 0x00000008
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#define LM_FLAG_PRIORITY 0x00000010 */
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#define GL_ASYNC 0x00000040
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#define GL_EXACT 0x00000080
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#define GL_SKIP 0x00000100
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#define GL_ATIME 0x00000200
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#define GL_NOCACHE 0x00000400
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2007-09-14 11:35:27 +07:00
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#define GL_FLOCK 0x00000800
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2006-01-16 23:50:04 +07:00
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#define GL_NOCANCEL 0x00001000
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#define GLR_TRYFAILED 13
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#define GLR_CANCELED 14
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static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
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{
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struct gfs2_holder *gh;
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int locked = 0;
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/* Look in glock's list of holders for one with current task as owner */
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spin_lock(&gl->gl_spin);
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list_for_each_entry(gh, &gl->gl_holders, gh_list) {
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2007-03-24 05:05:15 +07:00
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if (gh->gh_owner_pid == current->pid) {
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2006-01-16 23:50:04 +07:00
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locked = 1;
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break;
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}
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}
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spin_unlock(&gl->gl_spin);
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return locked;
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}
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static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
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{
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2006-09-04 20:49:55 +07:00
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return gl->gl_state == LM_ST_EXCLUSIVE;
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2006-01-16 23:50:04 +07:00
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}
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static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
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{
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2006-09-04 20:49:55 +07:00
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return gl->gl_state == LM_ST_DEFERRED;
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2006-01-16 23:50:04 +07:00
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}
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static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
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{
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2006-09-04 20:49:55 +07:00
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return gl->gl_state == LM_ST_SHARED;
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2006-01-16 23:50:04 +07:00
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}
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static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
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{
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int ret;
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spin_lock(&gl->gl_spin);
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2007-03-16 16:40:31 +07:00
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ret = test_bit(GLF_DEMOTE, &gl->gl_flags) || !list_empty(&gl->gl_waiters3);
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2006-01-16 23:50:04 +07:00
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spin_unlock(&gl->gl_spin);
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return ret;
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}
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int gfs2_glock_get(struct gfs2_sbd *sdp,
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2006-09-04 23:49:07 +07:00
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u64 number, const struct gfs2_glock_operations *glops,
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2006-01-16 23:50:04 +07:00
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int create, struct gfs2_glock **glp);
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void gfs2_glock_hold(struct gfs2_glock *gl);
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int gfs2_glock_put(struct gfs2_glock *gl);
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2006-04-21 03:57:23 +07:00
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void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
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2006-01-16 23:50:04 +07:00
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struct gfs2_holder *gh);
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2006-04-21 03:57:23 +07:00
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void gfs2_holder_reinit(unsigned int state, unsigned flags,
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struct gfs2_holder *gh);
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2006-01-16 23:50:04 +07:00
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void gfs2_holder_uninit(struct gfs2_holder *gh);
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int gfs2_glock_nq(struct gfs2_holder *gh);
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int gfs2_glock_poll(struct gfs2_holder *gh);
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int gfs2_glock_wait(struct gfs2_holder *gh);
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void gfs2_glock_dq(struct gfs2_holder *gh);
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2007-06-11 14:22:32 +07:00
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void gfs2_glock_dq_wait(struct gfs2_holder *gh);
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2006-01-16 23:50:04 +07:00
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void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
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int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
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2006-09-04 23:49:07 +07:00
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u64 number, const struct gfs2_glock_operations *glops,
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2006-01-16 23:50:04 +07:00
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unsigned int state, int flags, struct gfs2_holder *gh);
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int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
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void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
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void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
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2006-03-30 02:36:49 +07:00
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/**
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* gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
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* @gl: the glock
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* @state: the state we're requesting
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* @flags: the modifier flags
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* @gh: the holder structure
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*
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* Returns: 0, GLR_*, or errno
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*/
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static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
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unsigned int state, int flags,
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struct gfs2_holder *gh)
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{
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int error;
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gfs2_holder_init(gl, state, flags, gh);
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error = gfs2_glock_nq(gh);
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if (error)
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gfs2_holder_uninit(gh);
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return error;
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}
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2006-01-16 23:50:04 +07:00
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/* Lock Value Block functions */
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int gfs2_lvb_hold(struct gfs2_glock *gl);
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void gfs2_lvb_unhold(struct gfs2_glock *gl);
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2006-09-08 21:17:58 +07:00
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void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
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2006-01-16 23:50:04 +07:00
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void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
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void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
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void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
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2006-09-08 01:40:21 +07:00
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int __init gfs2_glock_init(void);
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2007-08-01 19:57:10 +07:00
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void gfs2_glock_exit(void);
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2007-03-16 17:26:37 +07:00
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int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
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void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
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int gfs2_register_debugfs(void);
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void gfs2_unregister_debugfs(void);
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2006-09-08 01:40:21 +07:00
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2006-01-16 23:50:04 +07:00
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#endif /* __GLOCK_DOT_H__ */
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