cregit-Linux how code gets into the kernel

Release 4.10 fs/gfs2/glock.h

Directory: fs/gfs2
 * 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 <linux/parser.h>
#include "incore.h"

/* Options for hostdata parser */

enum {

 * lm_lockname types

#define LM_TYPE_RESERVED	0x00

#define LM_TYPE_NONDISK		0x01

#define LM_TYPE_INODE		0x02

#define LM_TYPE_RGRP		0x03

#define LM_TYPE_META		0x04

#define LM_TYPE_IOPEN		0x05

#define LM_TYPE_FLOCK		0x06

#define LM_TYPE_PLOCK		0x07

#define LM_TYPE_QUOTA		0x08

#define LM_TYPE_JOURNAL		0x09

 * lm_lock() states
 * SHARED is compatible with SHARED, not with DEFERRED or EX.
 * DEFERRED is compatible with DEFERRED, not with SHARED or EX.

#define LM_ST_UNLOCKED		0

#define LM_ST_EXCLUSIVE		1

#define LM_ST_DEFERRED		2

#define LM_ST_SHARED		3

 * lm_lock() flags
 * Don't wait to acquire the lock if it can't be granted immediately.
 * Send one blocking callback if TRY is set and the lock is not granted.
 * GFS sets this flag on lock requests it makes while doing journal recovery.
 * These special requests should not be blocked due to the recovery like
 * ordinary locks would be.
 * A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
 * also be granted in SHARED.  The preferred state is whichever is compatible
 * with other granted locks, or the specified state if no other locks exist.
 * Override fairness considerations.  Suppose a lock is held in a shared state
 * and there is a pending request for the deferred state.  A shared lock
 * request with the priority flag would be allowed to bypass the deferred
 * request and directly join the other shared lock.  A shared lock request
 * without the priority flag might be forced to wait until the deferred
 * requested had acquired and released the lock.

#define LM_FLAG_TRY		0x0001

#define LM_FLAG_TRY_1CB		0x0002

#define LM_FLAG_NOEXP		0x0004

#define LM_FLAG_ANY		0x0008

#define LM_FLAG_PRIORITY	0x0010

#define GL_ASYNC		0x0040

#define GL_EXACT		0x0080

#define GL_SKIP			0x0100

#define GL_NOCACHE		0x0400
 * lm_async_cb return flags
 * Masks the lower two bits of lock state in the returned value.
 * The lock request was canceled.

#define LM_OUT_ST_MASK		0x00000003

#define LM_OUT_CANCELED		0x00000008

#define LM_OUT_ERROR		0x00000004

 * lm_recovery_done() messages

#define LM_RD_GAVEUP		308

#define LM_RD_SUCCESS		309

#define GLR_TRYFAILED		13

#define GL_GLOCK_MAX_HOLD        (long)(HZ / 5)

#define GL_GLOCK_DFT_HOLD        (long)(HZ / 5)

#define GL_GLOCK_MIN_HOLD        (long)(10)

#define GL_GLOCK_HOLD_INCR       (long)(HZ / 20)

#define GL_GLOCK_HOLD_DECR       (long)(HZ / 40)

struct lm_lockops {
const char *lm_proto_name;
int (*lm_mount) (struct gfs2_sbd *sdp, const char *table);
void (*lm_first_done) (struct gfs2_sbd *sdp);
void (*lm_recovery_result) (struct gfs2_sbd *sdp, unsigned int jid,
				    unsigned int result);
void (*lm_unmount) (struct gfs2_sbd *sdp);
void (*lm_withdraw) (struct gfs2_sbd *sdp);
void (*lm_put_lock) (struct gfs2_glock *gl);
int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state,
			unsigned int flags);
void (*lm_cancel) (struct gfs2_glock *gl);
const match_table_t *lm_tokens;

extern struct workqueue_struct *gfs2_delete_workqueue;

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_lockref.lock); 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_lockref.lock); return gh; }


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steven whitehousesteven whitehouse2627.08%233.33%
pavel emelianovpavel emelianov1212.50%116.67%
andreas gruenbacherandreas gruenbacher66.25%116.67%
robert s. petersonrobert s. peterson22.08%116.67%

static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) { return gl->gl_state == LM_ST_EXCLUSIVE; }


david teiglanddavid teigland19100.00%1100.00%

static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) { return gl->gl_state == LM_ST_DEFERRED; }


david teiglanddavid teigland19100.00%1100.00%

static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) { return gl->gl_state == LM_ST_SHARED; }


david teiglanddavid teigland19100.00%1100.00%

static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl) { if (gl->gl_ops->go_flags & GLOF_ASPACE) return (struct address_space *)(gl + 1); return NULL; }


steven whitehousesteven whitehouse39100.00%1100.00%

extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, const struct gfs2_glock_operations *glops, int create, struct gfs2_glock **glp); extern void gfs2_glock_put(struct gfs2_glock *gl); extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags, struct gfs2_holder *gh); extern void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh); extern void gfs2_holder_uninit(struct gfs2_holder *gh); extern int gfs2_glock_nq(struct gfs2_holder *gh); extern int gfs2_glock_poll(struct gfs2_holder *gh); extern int gfs2_glock_wait(struct gfs2_holder *gh); extern void gfs2_glock_dq(struct gfs2_holder *gh); extern void gfs2_glock_dq_wait(struct gfs2_holder *gh); extern void gfs2_glock_dq_uninit(struct gfs2_holder *gh); extern int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, const struct gfs2_glock_operations *glops, unsigned int state, u16 flags, struct gfs2_holder *gh); extern int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); extern void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); extern void gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl); #define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { gfs2_dump_glock(NULL, gl); BUG(); } } while(0) extern __printf(2, 3) void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); /** * gfs2_glock_nq_init - initialize 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, u16 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; }


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extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state); extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret); extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip); extern void gfs2_glock_thaw(struct gfs2_sbd *sdp); extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl); extern void gfs2_glock_free(struct gfs2_glock *gl); extern int __init gfs2_glock_init(void); extern void gfs2_glock_exit(void); extern int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); extern void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); extern int gfs2_register_debugfs(void); extern void gfs2_unregister_debugfs(void); extern const struct lm_lockops gfs2_dlm_ops;
static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder *gh) { gh->gh_gl = NULL; }


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static inline bool gfs2_holder_initialized(struct gfs2_holder *gh) { return gh->gh_gl; }


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#endif /* __GLOCK_DOT_H__ */

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andreas gruenbacherandreas gruenbacher414.18%26.06%
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Directory: fs/gfs2
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