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f9f229c1f7
Add a GL_NOBLOCK flag for trying to take a glock without sleeping. This will be used for implementing non-blocking lookup (MAY_NOT_BLOCK in gfs2_permission, LOOKUP_RCU in gfs2_drevalidate). Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
288 lines
8.1 KiB
C
288 lines
8.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*/
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#ifndef __GLOCK_DOT_H__
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#define __GLOCK_DOT_H__
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#include <linux/sched.h>
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#include <linux/parser.h>
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#include "incore.h"
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#include "util.h"
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/* Options for hostdata parser */
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enum {
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Opt_jid,
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Opt_id,
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Opt_first,
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Opt_nodir,
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Opt_err,
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};
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/*
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* lm_lockname types
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*/
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#define LM_TYPE_RESERVED 0x00
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#define LM_TYPE_NONDISK 0x01
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#define LM_TYPE_INODE 0x02
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#define LM_TYPE_RGRP 0x03
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#define LM_TYPE_META 0x04
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#define LM_TYPE_IOPEN 0x05
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#define LM_TYPE_FLOCK 0x06
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#define LM_TYPE_PLOCK 0x07
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#define LM_TYPE_QUOTA 0x08
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#define LM_TYPE_JOURNAL 0x09
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/*
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* lm_lock() states
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*
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* SHARED is compatible with SHARED, not with DEFERRED or EX.
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* DEFERRED is compatible with DEFERRED, not with SHARED or EX.
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*/
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#define LM_ST_UNLOCKED 0
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#define LM_ST_EXCLUSIVE 1
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#define LM_ST_DEFERRED 2
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#define LM_ST_SHARED 3
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/*
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* lm_lock() flags
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*
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* LM_FLAG_TRY
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* Don't wait to acquire the lock if it can't be granted immediately.
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*
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* LM_FLAG_TRY_1CB
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* Send one blocking callback if TRY is set and the lock is not granted.
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*
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* LM_FLAG_NOEXP
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* GFS sets this flag on lock requests it makes while doing journal recovery.
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* These special requests should not be blocked due to the recovery like
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* ordinary locks would be.
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*
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* LM_FLAG_ANY
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* A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
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* also be granted in SHARED. The preferred state is whichever is compatible
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* with other granted locks, or the specified state if no other locks exist.
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*
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* LM_FLAG_NODE_SCOPE
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* This holder agrees to share the lock within this node. In other words,
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* the glock is held in EX mode according to DLM, but local holders on the
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* same node can share it.
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*/
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#define LM_FLAG_TRY 0x0001
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#define LM_FLAG_TRY_1CB 0x0002
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#define LM_FLAG_NOEXP 0x0004
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#define LM_FLAG_ANY 0x0008
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#define LM_FLAG_NODE_SCOPE 0x0020
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#define GL_ASYNC 0x0040
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#define GL_EXACT 0x0080
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#define GL_SKIP 0x0100
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#define GL_NOPID 0x0200
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#define GL_NOCACHE 0x0400
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#define GL_NOBLOCK 0x0800
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/*
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* lm_async_cb return flags
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*
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* LM_OUT_ST_MASK
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* Masks the lower two bits of lock state in the returned value.
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*
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* LM_OUT_CANCELED
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* The lock request was canceled.
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*
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*/
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#define LM_OUT_ST_MASK 0x00000003
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#define LM_OUT_CANCELED 0x00000008
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#define LM_OUT_ERROR 0x00000004
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/*
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* lm_recovery_done() messages
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*/
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#define LM_RD_GAVEUP 308
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#define LM_RD_SUCCESS 309
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#define GLR_TRYFAILED 13
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#define GL_GLOCK_MAX_HOLD (long)(HZ / 5)
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#define GL_GLOCK_DFT_HOLD (long)(HZ / 5)
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#define GL_GLOCK_MIN_HOLD (long)(10)
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#define GL_GLOCK_HOLD_INCR (long)(HZ / 20)
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#define GL_GLOCK_HOLD_DECR (long)(HZ / 40)
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struct lm_lockops {
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const char *lm_proto_name;
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int (*lm_mount) (struct gfs2_sbd *sdp, const char *table);
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void (*lm_first_done) (struct gfs2_sbd *sdp);
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void (*lm_recovery_result) (struct gfs2_sbd *sdp, unsigned int jid,
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unsigned int result);
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void (*lm_unmount) (struct gfs2_sbd *sdp);
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void (*lm_withdraw) (struct gfs2_sbd *sdp);
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void (*lm_put_lock) (struct gfs2_glock *gl);
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int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state,
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unsigned int flags);
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void (*lm_cancel) (struct gfs2_glock *gl);
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const match_table_t *lm_tokens;
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};
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struct gfs2_glock_aspace {
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struct gfs2_glock glock;
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struct address_space mapping;
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};
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static inline struct gfs2_holder *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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struct pid *pid;
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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_lockref.lock);
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pid = task_pid(current);
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list_for_each_entry(gh, &gl->gl_holders, gh_list) {
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if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
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break;
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if (gh->gh_owner_pid == pid)
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goto out;
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}
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gh = NULL;
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out:
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spin_unlock(&gl->gl_lockref.lock);
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return gh;
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}
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static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl)
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{
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if (gl->gl_ops->go_flags & GLOF_ASPACE) {
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struct gfs2_glock_aspace *gla =
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container_of(gl, struct gfs2_glock_aspace, glock);
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return &gla->mapping;
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}
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return NULL;
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}
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int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
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const struct gfs2_glock_operations *glops,
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int create, struct gfs2_glock **glp);
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struct gfs2_glock *gfs2_glock_hold(struct gfs2_glock *gl);
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void gfs2_glock_put(struct gfs2_glock *gl);
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void gfs2_glock_queue_put(struct gfs2_glock *gl);
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void __gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
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u16 flags, struct gfs2_holder *gh,
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unsigned long ip);
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static inline void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
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u16 flags, struct gfs2_holder *gh) {
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__gfs2_holder_init(gl, state, flags, gh, _RET_IP_);
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}
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void gfs2_holder_reinit(unsigned int state, u16 flags,
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struct gfs2_holder *gh);
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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_instantiate(struct gfs2_holder *gh);
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int gfs2_glock_holder_ready(struct gfs2_holder *gh);
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int gfs2_glock_wait(struct gfs2_holder *gh);
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int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs);
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void gfs2_glock_dq(struct gfs2_holder *gh);
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void gfs2_glock_dq_wait(struct gfs2_holder *gh);
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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, u64 number,
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const struct gfs2_glock_operations *glops,
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unsigned int state, u16 flags,
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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_dump_glock(struct seq_file *seq, struct gfs2_glock *gl,
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bool fsid);
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#define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { \
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gfs2_dump_glock(NULL, gl, true); \
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BUG(); } } while(0)
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#define gfs2_glock_assert_warn(gl, x) do { if (unlikely(!(x))) { \
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gfs2_dump_glock(NULL, gl, true); \
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gfs2_assert_warn((gl)->gl_name.ln_sbd, (x)); } } \
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while (0)
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#define gfs2_glock_assert_withdraw(gl, x) do { if (unlikely(!(x))) { \
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gfs2_dump_glock(NULL, gl, true); \
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gfs2_assert_withdraw((gl)->gl_name.ln_sbd, (x)); } } \
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while (0)
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__printf(2, 3)
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void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
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/**
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* gfs2_glock_nq_init - initialize 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, u16 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, _RET_IP_);
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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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void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
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void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
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bool gfs2_queue_try_to_evict(struct gfs2_glock *gl);
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void gfs2_cancel_delete_work(struct gfs2_glock *gl);
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void gfs2_flush_delete_work(struct gfs2_sbd *sdp);
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void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
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void gfs2_gl_dq_holders(struct gfs2_sbd *sdp);
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void gfs2_glock_thaw(struct gfs2_sbd *sdp);
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void gfs2_glock_add_to_lru(struct gfs2_glock *gl);
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void gfs2_glock_free(struct gfs2_glock *gl);
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int __init gfs2_glock_init(void);
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void gfs2_glock_exit(void);
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void 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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void gfs2_register_debugfs(void);
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void gfs2_unregister_debugfs(void);
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void glock_set_object(struct gfs2_glock *gl, void *object);
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void glock_clear_object(struct gfs2_glock *gl, void *object);
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extern const struct lm_lockops gfs2_dlm_ops;
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static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder *gh)
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{
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gh->gh_gl = NULL;
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}
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static inline bool gfs2_holder_initialized(struct gfs2_holder *gh)
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{
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return gh->gh_gl;
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}
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static inline bool gfs2_holder_queued(struct gfs2_holder *gh)
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{
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return !list_empty(&gh->gh_list);
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}
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void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation);
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bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation);
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#endif /* __GLOCK_DOT_H__ */
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