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4033 lines
113 KiB
C
4033 lines
113 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dlmglue.c
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*
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* Code which implements an OCFS2 specific interface to our DLM.
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*
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* Copyright (C) 2003, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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#include <linux/kthread.h>
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#include <linux/pagemap.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/time.h>
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#include <linux/quotaops.h>
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#define MLOG_MASK_PREFIX ML_DLM_GLUE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "ocfs2_lockingver.h"
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#include "alloc.h"
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#include "dcache.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "file.h"
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#include "heartbeat.h"
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#include "inode.h"
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#include "journal.h"
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#include "stackglue.h"
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#include "slot_map.h"
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#include "super.h"
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#include "uptodate.h"
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#include "quota.h"
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#include "refcounttree.h"
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#include "buffer_head_io.h"
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struct ocfs2_mask_waiter {
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struct list_head mw_item;
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int mw_status;
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struct completion mw_complete;
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unsigned long mw_mask;
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unsigned long mw_goal;
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#ifdef CONFIG_OCFS2_FS_STATS
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ktime_t mw_lock_start;
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#endif
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};
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static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
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static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
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static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres);
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static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres);
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/*
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* Return value from ->downconvert_worker functions.
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*
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* These control the precise actions of ocfs2_unblock_lock()
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* and ocfs2_process_blocked_lock()
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*
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*/
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enum ocfs2_unblock_action {
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UNBLOCK_CONTINUE = 0, /* Continue downconvert */
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UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire
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* ->post_unlock callback */
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UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire
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* ->post_unlock() callback. */
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};
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struct ocfs2_unblock_ctl {
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int requeue;
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enum ocfs2_unblock_action unblock_action;
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};
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/* Lockdep class keys */
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struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES];
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static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
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int new_level);
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static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres);
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static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
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int blocking);
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static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
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int blocking);
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static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres);
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static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
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int new_level);
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static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
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int blocking);
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#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
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/* This aids in debugging situations where a bad LVB might be involved. */
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static void ocfs2_dump_meta_lvb_info(u64 level,
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const char *function,
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unsigned int line,
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struct ocfs2_lock_res *lockres)
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{
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struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
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mlog(level, "LVB information for %s (called from %s:%u):\n",
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lockres->l_name, function, line);
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mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
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lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
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be32_to_cpu(lvb->lvb_igeneration));
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mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
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(unsigned long long)be64_to_cpu(lvb->lvb_isize),
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be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
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be16_to_cpu(lvb->lvb_imode));
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mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
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"mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
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(long long)be64_to_cpu(lvb->lvb_iatime_packed),
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(long long)be64_to_cpu(lvb->lvb_ictime_packed),
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(long long)be64_to_cpu(lvb->lvb_imtime_packed),
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be32_to_cpu(lvb->lvb_iattr));
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}
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/*
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* OCFS2 Lock Resource Operations
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*
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* These fine tune the behavior of the generic dlmglue locking infrastructure.
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*
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* The most basic of lock types can point ->l_priv to their respective
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* struct ocfs2_super and allow the default actions to manage things.
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*
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* Right now, each lock type also needs to implement an init function,
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* and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
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* should be called when the lock is no longer needed (i.e., object
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* destruction time).
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*/
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struct ocfs2_lock_res_ops {
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/*
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* Translate an ocfs2_lock_res * into an ocfs2_super *. Define
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* this callback if ->l_priv is not an ocfs2_super pointer
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*/
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struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
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/*
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* Optionally called in the downconvert thread after a
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* successful downconvert. The lockres will not be referenced
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* after this callback is called, so it is safe to free
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* memory, etc.
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*
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* The exact semantics of when this is called are controlled
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* by ->downconvert_worker()
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*/
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void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
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/*
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* Allow a lock type to add checks to determine whether it is
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* safe to downconvert a lock. Return 0 to re-queue the
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* downconvert at a later time, nonzero to continue.
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*
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* For most locks, the default checks that there are no
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* incompatible holders are sufficient.
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*
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* Called with the lockres spinlock held.
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*/
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int (*check_downconvert)(struct ocfs2_lock_res *, int);
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/*
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* Allows a lock type to populate the lock value block. This
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* is called on downconvert, and when we drop a lock.
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*
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* Locks that want to use this should set LOCK_TYPE_USES_LVB
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* in the flags field.
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*
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* Called with the lockres spinlock held.
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*/
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void (*set_lvb)(struct ocfs2_lock_res *);
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/*
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* Called from the downconvert thread when it is determined
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* that a lock will be downconverted. This is called without
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* any locks held so the function can do work that might
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* schedule (syncing out data, etc).
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*
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* This should return any one of the ocfs2_unblock_action
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* values, depending on what it wants the thread to do.
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*/
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int (*downconvert_worker)(struct ocfs2_lock_res *, int);
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/*
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* LOCK_TYPE_* flags which describe the specific requirements
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* of a lock type. Descriptions of each individual flag follow.
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*/
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int flags;
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};
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/*
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* Some locks want to "refresh" potentially stale data when a
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* meaningful (PRMODE or EXMODE) lock level is first obtained. If this
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* flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
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* individual lockres l_flags member from the ast function. It is
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* expected that the locking wrapper will clear the
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* OCFS2_LOCK_NEEDS_REFRESH flag when done.
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*/
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#define LOCK_TYPE_REQUIRES_REFRESH 0x1
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/*
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* Indicate that a lock type makes use of the lock value block. The
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* ->set_lvb lock type callback must be defined.
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*/
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#define LOCK_TYPE_USES_LVB 0x2
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static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
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.get_osb = ocfs2_get_inode_osb,
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.flags = 0,
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};
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static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = {
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.get_osb = ocfs2_get_inode_osb,
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.check_downconvert = ocfs2_check_meta_downconvert,
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.set_lvb = ocfs2_set_meta_lvb,
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.downconvert_worker = ocfs2_data_convert_worker,
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.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
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};
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static struct ocfs2_lock_res_ops ocfs2_super_lops = {
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.flags = LOCK_TYPE_REQUIRES_REFRESH,
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};
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static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
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.flags = 0,
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};
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static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = {
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.flags = 0,
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};
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static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = {
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.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
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};
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static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
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.get_osb = ocfs2_get_dentry_osb,
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.post_unlock = ocfs2_dentry_post_unlock,
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.downconvert_worker = ocfs2_dentry_convert_worker,
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.flags = 0,
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};
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static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
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.get_osb = ocfs2_get_inode_osb,
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.flags = 0,
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};
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static struct ocfs2_lock_res_ops ocfs2_flock_lops = {
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.get_osb = ocfs2_get_file_osb,
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.flags = 0,
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};
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static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
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.set_lvb = ocfs2_set_qinfo_lvb,
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.get_osb = ocfs2_get_qinfo_osb,
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.flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB,
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};
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static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
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.check_downconvert = ocfs2_check_refcount_downconvert,
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.downconvert_worker = ocfs2_refcount_convert_worker,
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.flags = 0,
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};
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static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
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{
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return lockres->l_type == OCFS2_LOCK_TYPE_META ||
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lockres->l_type == OCFS2_LOCK_TYPE_RW ||
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lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
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}
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static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb)
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{
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return container_of(lksb, struct ocfs2_lock_res, l_lksb);
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}
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static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
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{
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BUG_ON(!ocfs2_is_inode_lock(lockres));
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return (struct inode *) lockres->l_priv;
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}
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static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
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{
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BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
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return (struct ocfs2_dentry_lock *)lockres->l_priv;
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}
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static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres)
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{
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BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO);
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return (struct ocfs2_mem_dqinfo *)lockres->l_priv;
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}
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static inline struct ocfs2_refcount_tree *
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ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res)
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{
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return container_of(res, struct ocfs2_refcount_tree, rf_lockres);
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}
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static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
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{
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if (lockres->l_ops->get_osb)
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return lockres->l_ops->get_osb(lockres);
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return (struct ocfs2_super *)lockres->l_priv;
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}
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static int ocfs2_lock_create(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres,
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int level,
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u32 dlm_flags);
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static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
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int wanted);
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static void __ocfs2_cluster_unlock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres,
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int level, unsigned long caller_ip);
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static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres,
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int level)
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{
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__ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_);
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}
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static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
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static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
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static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
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static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
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static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
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int convert);
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#define ocfs2_log_dlm_error(_func, _err, _lockres) do { \
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if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \
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mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
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_err, _func, _lockres->l_name); \
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else \
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mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \
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_err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \
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(unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \
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} while (0)
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static int ocfs2_downconvert_thread(void *arg);
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static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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static int ocfs2_inode_lock_update(struct inode *inode,
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struct buffer_head **bh);
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static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
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static inline int ocfs2_highest_compat_lock_level(int level);
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static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
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int new_level);
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static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres,
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int new_level,
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int lvb,
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unsigned int generation);
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static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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static int ocfs2_cancel_convert(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
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u64 blkno,
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u32 generation,
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char *name)
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{
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int len;
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BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
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len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
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ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
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(long long)blkno, generation);
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BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
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mlog(0, "built lock resource with name: %s\n", name);
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}
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static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
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static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
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struct ocfs2_dlm_debug *dlm_debug)
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{
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mlog(0, "Add tracking for lockres %s\n", res->l_name);
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spin_lock(&ocfs2_dlm_tracking_lock);
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list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
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spin_unlock(&ocfs2_dlm_tracking_lock);
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}
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static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
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{
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spin_lock(&ocfs2_dlm_tracking_lock);
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if (!list_empty(&res->l_debug_list))
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list_del_init(&res->l_debug_list);
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spin_unlock(&ocfs2_dlm_tracking_lock);
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}
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#ifdef CONFIG_OCFS2_FS_STATS
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static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
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{
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res->l_lock_refresh = 0;
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memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats));
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memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats));
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}
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|
|
|
static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level,
|
|
struct ocfs2_mask_waiter *mw, int ret)
|
|
{
|
|
u32 usec;
|
|
ktime_t kt;
|
|
struct ocfs2_lock_stats *stats;
|
|
|
|
if (level == LKM_PRMODE)
|
|
stats = &res->l_lock_prmode;
|
|
else if (level == LKM_EXMODE)
|
|
stats = &res->l_lock_exmode;
|
|
else
|
|
return;
|
|
|
|
kt = ktime_sub(ktime_get(), mw->mw_lock_start);
|
|
usec = ktime_to_us(kt);
|
|
|
|
stats->ls_gets++;
|
|
stats->ls_total += ktime_to_ns(kt);
|
|
/* overflow */
|
|
if (unlikely(stats->ls_gets) == 0) {
|
|
stats->ls_gets++;
|
|
stats->ls_total = ktime_to_ns(kt);
|
|
}
|
|
|
|
if (stats->ls_max < usec)
|
|
stats->ls_max = usec;
|
|
|
|
if (ret)
|
|
stats->ls_fail++;
|
|
}
|
|
|
|
static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
|
|
{
|
|
lockres->l_lock_refresh++;
|
|
}
|
|
|
|
static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
|
|
{
|
|
mw->mw_lock_start = ktime_get();
|
|
}
|
|
#else
|
|
static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
|
|
{
|
|
}
|
|
static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res,
|
|
int level, struct ocfs2_mask_waiter *mw, int ret)
|
|
{
|
|
}
|
|
static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
|
|
{
|
|
}
|
|
static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *res,
|
|
enum ocfs2_lock_type type,
|
|
struct ocfs2_lock_res_ops *ops,
|
|
void *priv)
|
|
{
|
|
res->l_type = type;
|
|
res->l_ops = ops;
|
|
res->l_priv = priv;
|
|
|
|
res->l_level = DLM_LOCK_IV;
|
|
res->l_requested = DLM_LOCK_IV;
|
|
res->l_blocking = DLM_LOCK_IV;
|
|
res->l_action = OCFS2_AST_INVALID;
|
|
res->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
|
|
|
res->l_flags = OCFS2_LOCK_INITIALIZED;
|
|
|
|
ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
|
|
|
|
ocfs2_init_lock_stats(res);
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
if (type != OCFS2_LOCK_TYPE_OPEN)
|
|
lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type],
|
|
&lockdep_keys[type], 0);
|
|
else
|
|
res->l_lockdep_map.key = NULL;
|
|
#endif
|
|
}
|
|
|
|
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
|
|
{
|
|
/* This also clears out the lock status block */
|
|
memset(res, 0, sizeof(struct ocfs2_lock_res));
|
|
spin_lock_init(&res->l_lock);
|
|
init_waitqueue_head(&res->l_event);
|
|
INIT_LIST_HEAD(&res->l_blocked_list);
|
|
INIT_LIST_HEAD(&res->l_mask_waiters);
|
|
}
|
|
|
|
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
|
|
enum ocfs2_lock_type type,
|
|
unsigned int generation,
|
|
struct inode *inode)
|
|
{
|
|
struct ocfs2_lock_res_ops *ops;
|
|
|
|
switch(type) {
|
|
case OCFS2_LOCK_TYPE_RW:
|
|
ops = &ocfs2_inode_rw_lops;
|
|
break;
|
|
case OCFS2_LOCK_TYPE_META:
|
|
ops = &ocfs2_inode_inode_lops;
|
|
break;
|
|
case OCFS2_LOCK_TYPE_OPEN:
|
|
ops = &ocfs2_inode_open_lops;
|
|
break;
|
|
default:
|
|
mlog_bug_on_msg(1, "type: %d\n", type);
|
|
ops = NULL; /* thanks, gcc */
|
|
break;
|
|
};
|
|
|
|
ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
|
|
generation, res->l_name);
|
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
|
|
}
|
|
|
|
static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct inode *inode = ocfs2_lock_res_inode(lockres);
|
|
|
|
return OCFS2_SB(inode->i_sb);
|
|
}
|
|
|
|
static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_mem_dqinfo *info = lockres->l_priv;
|
|
|
|
return OCFS2_SB(info->dqi_gi.dqi_sb);
|
|
}
|
|
|
|
static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_file_private *fp = lockres->l_priv;
|
|
|
|
return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb);
|
|
}
|
|
|
|
static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
|
|
{
|
|
__be64 inode_blkno_be;
|
|
|
|
memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
|
|
sizeof(__be64));
|
|
|
|
return be64_to_cpu(inode_blkno_be);
|
|
}
|
|
|
|
static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_dentry_lock *dl = lockres->l_priv;
|
|
|
|
return OCFS2_SB(dl->dl_inode->i_sb);
|
|
}
|
|
|
|
void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
|
|
u64 parent, struct inode *inode)
|
|
{
|
|
int len;
|
|
u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
|
|
__be64 inode_blkno_be = cpu_to_be64(inode_blkno);
|
|
struct ocfs2_lock_res *lockres = &dl->dl_lockres;
|
|
|
|
ocfs2_lock_res_init_once(lockres);
|
|
|
|
/*
|
|
* Unfortunately, the standard lock naming scheme won't work
|
|
* here because we have two 16 byte values to use. Instead,
|
|
* we'll stuff the inode number as a binary value. We still
|
|
* want error prints to show something without garbling the
|
|
* display, so drop a null byte in there before the inode
|
|
* number. A future version of OCFS2 will likely use all
|
|
* binary lock names. The stringified names have been a
|
|
* tremendous aid in debugging, but now that the debugfs
|
|
* interface exists, we can mangle things there if need be.
|
|
*
|
|
* NOTE: We also drop the standard "pad" value (the total lock
|
|
* name size stays the same though - the last part is all
|
|
* zeros due to the memset in ocfs2_lock_res_init_once()
|
|
*/
|
|
len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
|
|
"%c%016llx",
|
|
ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
|
|
(long long)parent);
|
|
|
|
BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
|
|
|
|
memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
|
|
sizeof(__be64));
|
|
|
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
|
|
OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
|
|
dl);
|
|
}
|
|
|
|
static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
|
|
struct ocfs2_super *osb)
|
|
{
|
|
/* Superblock lockres doesn't come from a slab so we call init
|
|
* once on it manually. */
|
|
ocfs2_lock_res_init_once(res);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
|
|
0, res->l_name);
|
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
|
|
&ocfs2_super_lops, osb);
|
|
}
|
|
|
|
static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
|
|
struct ocfs2_super *osb)
|
|
{
|
|
/* Rename lockres doesn't come from a slab so we call init
|
|
* once on it manually. */
|
|
ocfs2_lock_res_init_once(res);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
|
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
|
|
&ocfs2_rename_lops, osb);
|
|
}
|
|
|
|
static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res,
|
|
struct ocfs2_super *osb)
|
|
{
|
|
/* nfs_sync lockres doesn't come from a slab so we call init
|
|
* once on it manually. */
|
|
ocfs2_lock_res_init_once(res);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name);
|
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC,
|
|
&ocfs2_nfs_sync_lops, osb);
|
|
}
|
|
|
|
static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res,
|
|
struct ocfs2_super *osb)
|
|
{
|
|
ocfs2_lock_res_init_once(res);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name);
|
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN,
|
|
&ocfs2_orphan_scan_lops, osb);
|
|
}
|
|
|
|
void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_file_private *fp)
|
|
{
|
|
struct inode *inode = fp->fp_file->f_mapping->host;
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
|
|
ocfs2_lock_res_init_once(lockres);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno,
|
|
inode->i_generation, lockres->l_name);
|
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
|
|
OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops,
|
|
fp);
|
|
lockres->l_flags |= OCFS2_LOCK_NOCACHE;
|
|
}
|
|
|
|
void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_mem_dqinfo *info)
|
|
{
|
|
ocfs2_lock_res_init_once(lockres);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type,
|
|
0, lockres->l_name);
|
|
ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres,
|
|
OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops,
|
|
info);
|
|
}
|
|
|
|
void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_super *osb, u64 ref_blkno,
|
|
unsigned int generation)
|
|
{
|
|
ocfs2_lock_res_init_once(lockres);
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno,
|
|
generation, lockres->l_name);
|
|
ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT,
|
|
&ocfs2_refcount_block_lops, osb);
|
|
}
|
|
|
|
void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
|
|
{
|
|
if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
|
|
return;
|
|
|
|
ocfs2_remove_lockres_tracking(res);
|
|
|
|
mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
|
|
"Lockres %s is on the blocked list\n",
|
|
res->l_name);
|
|
mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
|
|
"Lockres %s has mask waiters pending\n",
|
|
res->l_name);
|
|
mlog_bug_on_msg(spin_is_locked(&res->l_lock),
|
|
"Lockres %s is locked\n",
|
|
res->l_name);
|
|
mlog_bug_on_msg(res->l_ro_holders,
|
|
"Lockres %s has %u ro holders\n",
|
|
res->l_name, res->l_ro_holders);
|
|
mlog_bug_on_msg(res->l_ex_holders,
|
|
"Lockres %s has %u ex holders\n",
|
|
res->l_name, res->l_ex_holders);
|
|
|
|
/* Need to clear out the lock status block for the dlm */
|
|
memset(&res->l_lksb, 0, sizeof(res->l_lksb));
|
|
|
|
res->l_flags = 0UL;
|
|
}
|
|
|
|
static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
BUG_ON(!lockres);
|
|
|
|
switch(level) {
|
|
case DLM_LOCK_EX:
|
|
lockres->l_ex_holders++;
|
|
break;
|
|
case DLM_LOCK_PR:
|
|
lockres->l_ro_holders++;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
BUG_ON(!lockres);
|
|
|
|
switch(level) {
|
|
case DLM_LOCK_EX:
|
|
BUG_ON(!lockres->l_ex_holders);
|
|
lockres->l_ex_holders--;
|
|
break;
|
|
case DLM_LOCK_PR:
|
|
BUG_ON(!lockres->l_ro_holders);
|
|
lockres->l_ro_holders--;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/* WARNING: This function lives in a world where the only three lock
|
|
* levels are EX, PR, and NL. It *will* have to be adjusted when more
|
|
* lock types are added. */
|
|
static inline int ocfs2_highest_compat_lock_level(int level)
|
|
{
|
|
int new_level = DLM_LOCK_EX;
|
|
|
|
if (level == DLM_LOCK_EX)
|
|
new_level = DLM_LOCK_NL;
|
|
else if (level == DLM_LOCK_PR)
|
|
new_level = DLM_LOCK_PR;
|
|
return new_level;
|
|
}
|
|
|
|
static void lockres_set_flags(struct ocfs2_lock_res *lockres,
|
|
unsigned long newflags)
|
|
{
|
|
struct ocfs2_mask_waiter *mw, *tmp;
|
|
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
lockres->l_flags = newflags;
|
|
|
|
list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) {
|
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
|
|
continue;
|
|
|
|
list_del_init(&mw->mw_item);
|
|
mw->mw_status = 0;
|
|
complete(&mw->mw_complete);
|
|
}
|
|
}
|
|
static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
|
|
{
|
|
lockres_set_flags(lockres, lockres->l_flags | or);
|
|
}
|
|
static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
|
|
unsigned long clear)
|
|
{
|
|
lockres_set_flags(lockres, lockres->l_flags & ~clear);
|
|
}
|
|
|
|
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
|
|
{
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
|
BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
|
|
|
|
lockres->l_level = lockres->l_requested;
|
|
if (lockres->l_level <=
|
|
ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
|
|
lockres->l_blocking = DLM_LOCK_NL;
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
|
|
}
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
}
|
|
|
|
static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
|
|
{
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
|
|
|
|
/* Convert from RO to EX doesn't really need anything as our
|
|
* information is already up to data. Convert from NL to
|
|
* *anything* however should mark ourselves as needing an
|
|
* update */
|
|
if (lockres->l_level == DLM_LOCK_NL &&
|
|
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
|
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
|
|
lockres->l_level = lockres->l_requested;
|
|
|
|
/*
|
|
* We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing
|
|
* the OCFS2_LOCK_BUSY flag to prevent the dc thread from
|
|
* downconverting the lock before the upconvert has fully completed.
|
|
*/
|
|
lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
|
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
}
|
|
|
|
static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
|
|
{
|
|
BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY)));
|
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
|
|
|
|
if (lockres->l_requested > DLM_LOCK_NL &&
|
|
!(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
|
|
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
|
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
|
|
lockres->l_level = lockres->l_requested;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
}
|
|
|
|
static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
int needs_downconvert = 0;
|
|
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
if (level > lockres->l_blocking) {
|
|
/* only schedule a downconvert if we haven't already scheduled
|
|
* one that goes low enough to satisfy the level we're
|
|
* blocking. this also catches the case where we get
|
|
* duplicate BASTs */
|
|
if (ocfs2_highest_compat_lock_level(level) <
|
|
ocfs2_highest_compat_lock_level(lockres->l_blocking))
|
|
needs_downconvert = 1;
|
|
|
|
lockres->l_blocking = level;
|
|
}
|
|
|
|
mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n",
|
|
lockres->l_name, level, lockres->l_level, lockres->l_blocking,
|
|
needs_downconvert);
|
|
|
|
if (needs_downconvert)
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
|
|
mlog(0, "needs_downconvert = %d\n", needs_downconvert);
|
|
return needs_downconvert;
|
|
}
|
|
|
|
/*
|
|
* OCFS2_LOCK_PENDING and l_pending_gen.
|
|
*
|
|
* Why does OCFS2_LOCK_PENDING exist? To close a race between setting
|
|
* OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock()
|
|
* for more details on the race.
|
|
*
|
|
* OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces
|
|
* a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock()
|
|
* returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear
|
|
* OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns,
|
|
* the caller is going to try to clear PENDING again. If nothing else is
|
|
* happening, __lockres_clear_pending() sees PENDING is unset and does
|
|
* nothing.
|
|
*
|
|
* But what if another path (eg downconvert thread) has just started a
|
|
* new locking action? The other path has re-set PENDING. Our path
|
|
* cannot clear PENDING, because that will re-open the original race
|
|
* window.
|
|
*
|
|
* [Example]
|
|
*
|
|
* ocfs2_meta_lock()
|
|
* ocfs2_cluster_lock()
|
|
* set BUSY
|
|
* set PENDING
|
|
* drop l_lock
|
|
* ocfs2_dlm_lock()
|
|
* ocfs2_locking_ast() ocfs2_downconvert_thread()
|
|
* clear PENDING ocfs2_unblock_lock()
|
|
* take_l_lock
|
|
* !BUSY
|
|
* ocfs2_prepare_downconvert()
|
|
* set BUSY
|
|
* set PENDING
|
|
* drop l_lock
|
|
* take l_lock
|
|
* clear PENDING
|
|
* drop l_lock
|
|
* <window>
|
|
* ocfs2_dlm_lock()
|
|
*
|
|
* So as you can see, we now have a window where l_lock is not held,
|
|
* PENDING is not set, and ocfs2_dlm_lock() has not been called.
|
|
*
|
|
* The core problem is that ocfs2_cluster_lock() has cleared the PENDING
|
|
* set by ocfs2_prepare_downconvert(). That wasn't nice.
|
|
*
|
|
* To solve this we introduce l_pending_gen. A call to
|
|
* lockres_clear_pending() will only do so when it is passed a generation
|
|
* number that matches the lockres. lockres_set_pending() will return the
|
|
* current generation number. When ocfs2_cluster_lock() goes to clear
|
|
* PENDING, it passes the generation it got from set_pending(). In our
|
|
* example above, the generation numbers will *not* match. Thus,
|
|
* ocfs2_cluster_lock() will not clear the PENDING set by
|
|
* ocfs2_prepare_downconvert().
|
|
*/
|
|
|
|
/* Unlocked version for ocfs2_locking_ast() */
|
|
static void __lockres_clear_pending(struct ocfs2_lock_res *lockres,
|
|
unsigned int generation,
|
|
struct ocfs2_super *osb)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
/*
|
|
* The ast and locking functions can race us here. The winner
|
|
* will clear pending, the loser will not.
|
|
*/
|
|
if (!(lockres->l_flags & OCFS2_LOCK_PENDING) ||
|
|
(lockres->l_pending_gen != generation))
|
|
return;
|
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_PENDING);
|
|
lockres->l_pending_gen++;
|
|
|
|
/*
|
|
* The downconvert thread may have skipped us because we
|
|
* were PENDING. Wake it up.
|
|
*/
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
|
|
ocfs2_wake_downconvert_thread(osb);
|
|
}
|
|
|
|
/* Locked version for callers of ocfs2_dlm_lock() */
|
|
static void lockres_clear_pending(struct ocfs2_lock_res *lockres,
|
|
unsigned int generation,
|
|
struct ocfs2_super *osb)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
__lockres_clear_pending(lockres, generation, osb);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
}
|
|
|
|
static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
|
|
|
lockres_or_flags(lockres, OCFS2_LOCK_PENDING);
|
|
|
|
return lockres->l_pending_gen;
|
|
}
|
|
|
|
static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level)
|
|
{
|
|
struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb);
|
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
|
|
int needs_downconvert;
|
|
unsigned long flags;
|
|
|
|
BUG_ON(level <= DLM_LOCK_NL);
|
|
|
|
mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, "
|
|
"type %s\n", lockres->l_name, level, lockres->l_level,
|
|
ocfs2_lock_type_string(lockres->l_type));
|
|
|
|
/*
|
|
* We can skip the bast for locks which don't enable caching -
|
|
* they'll be dropped at the earliest possible time anyway.
|
|
*/
|
|
if (lockres->l_flags & OCFS2_LOCK_NOCACHE)
|
|
return;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
|
|
if (needs_downconvert)
|
|
ocfs2_schedule_blocked_lock(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
|
|
ocfs2_wake_downconvert_thread(osb);
|
|
}
|
|
|
|
static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb)
|
|
{
|
|
struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb);
|
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
|
|
unsigned long flags;
|
|
int status;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
status = ocfs2_dlm_lock_status(&lockres->l_lksb);
|
|
|
|
if (status == -EAGAIN) {
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
goto out;
|
|
}
|
|
|
|
if (status) {
|
|
mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n",
|
|
lockres->l_name, status);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
return;
|
|
}
|
|
|
|
mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, "
|
|
"level %d => %d\n", lockres->l_name, lockres->l_action,
|
|
lockres->l_unlock_action, lockres->l_level, lockres->l_requested);
|
|
|
|
switch(lockres->l_action) {
|
|
case OCFS2_AST_ATTACH:
|
|
ocfs2_generic_handle_attach_action(lockres);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
|
|
break;
|
|
case OCFS2_AST_CONVERT:
|
|
ocfs2_generic_handle_convert_action(lockres);
|
|
break;
|
|
case OCFS2_AST_DOWNCONVERT:
|
|
ocfs2_generic_handle_downconvert_action(lockres);
|
|
break;
|
|
default:
|
|
mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, "
|
|
"flags 0x%lx, unlock: %u\n",
|
|
lockres->l_name, lockres->l_action, lockres->l_flags,
|
|
lockres->l_unlock_action);
|
|
BUG();
|
|
}
|
|
out:
|
|
/* set it to something invalid so if we get called again we
|
|
* can catch it. */
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
|
|
/* Did we try to cancel this lock? Clear that state */
|
|
if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT)
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
|
|
|
/*
|
|
* We may have beaten the locking functions here. We certainly
|
|
* know that dlm_lock() has been called :-)
|
|
* Because we can't have two lock calls in flight at once, we
|
|
* can use lockres->l_pending_gen.
|
|
*/
|
|
__lockres_clear_pending(lockres, lockres->l_pending_gen, osb);
|
|
|
|
wake_up(&lockres->l_event);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
}
|
|
|
|
static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error)
|
|
{
|
|
struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb);
|
|
unsigned long flags;
|
|
|
|
mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n",
|
|
lockres->l_name, lockres->l_unlock_action);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (error) {
|
|
mlog(ML_ERROR, "Dlm passes error %d for lock %s, "
|
|
"unlock_action %d\n", error, lockres->l_name,
|
|
lockres->l_unlock_action);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
return;
|
|
}
|
|
|
|
switch(lockres->l_unlock_action) {
|
|
case OCFS2_UNLOCK_CANCEL_CONVERT:
|
|
mlog(0, "Cancel convert success for %s\n", lockres->l_name);
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
/* Downconvert thread may have requeued this lock, we
|
|
* need to wake it. */
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
|
|
ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres));
|
|
break;
|
|
case OCFS2_UNLOCK_DROP_LOCK:
|
|
lockres->l_level = DLM_LOCK_IV;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
|
wake_up(&lockres->l_event);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This is the filesystem locking protocol. It provides the lock handling
|
|
* hooks for the underlying DLM. It has a maximum version number.
|
|
* The version number allows interoperability with systems running at
|
|
* the same major number and an equal or smaller minor number.
|
|
*
|
|
* Whenever the filesystem does new things with locks (adds or removes a
|
|
* lock, orders them differently, does different things underneath a lock),
|
|
* the version must be changed. The protocol is negotiated when joining
|
|
* the dlm domain. A node may join the domain if its major version is
|
|
* identical to all other nodes and its minor version is greater than
|
|
* or equal to all other nodes. When its minor version is greater than
|
|
* the other nodes, it will run at the minor version specified by the
|
|
* other nodes.
|
|
*
|
|
* If a locking change is made that will not be compatible with older
|
|
* versions, the major number must be increased and the minor version set
|
|
* to zero. If a change merely adds a behavior that can be disabled when
|
|
* speaking to older versions, the minor version must be increased. If a
|
|
* change adds a fully backwards compatible change (eg, LVB changes that
|
|
* are just ignored by older versions), the version does not need to be
|
|
* updated.
|
|
*/
|
|
static struct ocfs2_locking_protocol lproto = {
|
|
.lp_max_version = {
|
|
.pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
|
|
.pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
|
|
},
|
|
.lp_lock_ast = ocfs2_locking_ast,
|
|
.lp_blocking_ast = ocfs2_blocking_ast,
|
|
.lp_unlock_ast = ocfs2_unlock_ast,
|
|
};
|
|
|
|
void ocfs2_set_locking_protocol(void)
|
|
{
|
|
ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version);
|
|
}
|
|
|
|
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
|
|
int convert)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
|
|
if (convert)
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
else
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
}
|
|
|
|
/* Note: If we detect another process working on the lock (i.e.,
|
|
* OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
|
|
* to do the right thing in that case.
|
|
*/
|
|
static int ocfs2_lock_create(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level,
|
|
u32 dlm_flags)
|
|
{
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
unsigned int gen;
|
|
|
|
mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level,
|
|
dlm_flags);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
|
|
(lockres->l_flags & OCFS2_LOCK_BUSY)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto bail;
|
|
}
|
|
|
|
lockres->l_action = OCFS2_AST_ATTACH;
|
|
lockres->l_requested = level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
gen = lockres_set_pending(lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ret = ocfs2_dlm_lock(osb->cconn,
|
|
level,
|
|
&lockres->l_lksb,
|
|
dlm_flags,
|
|
lockres->l_name,
|
|
OCFS2_LOCK_ID_MAX_LEN - 1);
|
|
lockres_clear_pending(lockres, gen, osb);
|
|
if (ret) {
|
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
}
|
|
|
|
mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name);
|
|
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
|
|
int flag)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
ret = lockres->l_flags & flag;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
|
|
|
|
{
|
|
wait_event(lockres->l_event,
|
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
|
|
}
|
|
|
|
static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
|
|
|
|
{
|
|
wait_event(lockres->l_event,
|
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
|
|
}
|
|
|
|
/* predict what lock level we'll be dropping down to on behalf
|
|
* of another node, and return true if the currently wanted
|
|
* level will be compatible with it. */
|
|
static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
|
|
int wanted)
|
|
{
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
|
|
|
return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
|
}
|
|
|
|
static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
|
|
{
|
|
INIT_LIST_HEAD(&mw->mw_item);
|
|
init_completion(&mw->mw_complete);
|
|
ocfs2_init_start_time(mw);
|
|
}
|
|
|
|
static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
|
|
{
|
|
wait_for_completion(&mw->mw_complete);
|
|
/* Re-arm the completion in case we want to wait on it again */
|
|
INIT_COMPLETION(mw->mw_complete);
|
|
return mw->mw_status;
|
|
}
|
|
|
|
static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_mask_waiter *mw,
|
|
unsigned long mask,
|
|
unsigned long goal)
|
|
{
|
|
BUG_ON(!list_empty(&mw->mw_item));
|
|
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
|
|
mw->mw_mask = mask;
|
|
mw->mw_goal = goal;
|
|
}
|
|
|
|
/* returns 0 if the mw that was removed was already satisfied, -EBUSY
|
|
* if the mask still hadn't reached its goal */
|
|
static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_mask_waiter *mw)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (!list_empty(&mw->mw_item)) {
|
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
|
|
ret = -EBUSY;
|
|
|
|
list_del_init(&mw->mw_item);
|
|
init_completion(&mw->mw_complete);
|
|
}
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int ret;
|
|
|
|
ret = wait_for_completion_interruptible(&mw->mw_complete);
|
|
if (ret)
|
|
lockres_remove_mask_waiter(lockres, mw);
|
|
else
|
|
ret = mw->mw_status;
|
|
/* Re-arm the completion in case we want to wait on it again */
|
|
INIT_COMPLETION(mw->mw_complete);
|
|
return ret;
|
|
}
|
|
|
|
static int __ocfs2_cluster_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level,
|
|
u32 lkm_flags,
|
|
int arg_flags,
|
|
int l_subclass,
|
|
unsigned long caller_ip)
|
|
{
|
|
struct ocfs2_mask_waiter mw;
|
|
int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
|
|
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
|
|
unsigned long flags;
|
|
unsigned int gen;
|
|
int noqueue_attempted = 0;
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
|
|
lkm_flags |= DLM_LKF_VALBLK;
|
|
|
|
again:
|
|
wait = 0;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
if (catch_signals && signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
goto unlock;
|
|
}
|
|
|
|
mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
|
|
"Cluster lock called on freeing lockres %s! flags "
|
|
"0x%lx\n", lockres->l_name, lockres->l_flags);
|
|
|
|
/* We only compare against the currently granted level
|
|
* here. If the lock is blocked waiting on a downconvert,
|
|
* we'll get caught below. */
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY &&
|
|
level > lockres->l_level) {
|
|
/* is someone sitting in dlm_lock? If so, wait on
|
|
* them. */
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
|
wait = 1;
|
|
goto unlock;
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) {
|
|
/*
|
|
* We've upconverted. If the lock now has a level we can
|
|
* work with, we take it. If, however, the lock is not at the
|
|
* required level, we go thru the full cycle. One way this could
|
|
* happen is if a process requesting an upconvert to PR is
|
|
* closely followed by another requesting upconvert to an EX.
|
|
* If the process requesting EX lands here, we want it to
|
|
* continue attempting to upconvert and let the process
|
|
* requesting PR take the lock.
|
|
* If multiple processes request upconvert to PR, the first one
|
|
* here will take the lock. The others will have to go thru the
|
|
* OCFS2_LOCK_BLOCKED check to ensure that there is no pending
|
|
* downconvert request.
|
|
*/
|
|
if (level <= lockres->l_level)
|
|
goto update_holders;
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
|
|
!ocfs2_may_continue_on_blocked_lock(lockres, level)) {
|
|
/* is the lock is currently blocked on behalf of
|
|
* another node */
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
|
|
wait = 1;
|
|
goto unlock;
|
|
}
|
|
|
|
if (level > lockres->l_level) {
|
|
if (noqueue_attempted > 0) {
|
|
ret = -EAGAIN;
|
|
goto unlock;
|
|
}
|
|
if (lkm_flags & DLM_LKF_NOQUEUE)
|
|
noqueue_attempted = 1;
|
|
|
|
if (lockres->l_action != OCFS2_AST_INVALID)
|
|
mlog(ML_ERROR, "lockres %s has action %u pending\n",
|
|
lockres->l_name, lockres->l_action);
|
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
|
lockres->l_action = OCFS2_AST_ATTACH;
|
|
lkm_flags &= ~DLM_LKF_CONVERT;
|
|
} else {
|
|
lockres->l_action = OCFS2_AST_CONVERT;
|
|
lkm_flags |= DLM_LKF_CONVERT;
|
|
}
|
|
|
|
lockres->l_requested = level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
gen = lockres_set_pending(lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
BUG_ON(level == DLM_LOCK_IV);
|
|
BUG_ON(level == DLM_LOCK_NL);
|
|
|
|
mlog(ML_BASTS, "lockres %s, convert from %d to %d\n",
|
|
lockres->l_name, lockres->l_level, level);
|
|
|
|
/* call dlm_lock to upgrade lock now */
|
|
ret = ocfs2_dlm_lock(osb->cconn,
|
|
level,
|
|
&lockres->l_lksb,
|
|
lkm_flags,
|
|
lockres->l_name,
|
|
OCFS2_LOCK_ID_MAX_LEN - 1);
|
|
lockres_clear_pending(lockres, gen, osb);
|
|
if (ret) {
|
|
if (!(lkm_flags & DLM_LKF_NOQUEUE) ||
|
|
(ret != -EAGAIN)) {
|
|
ocfs2_log_dlm_error("ocfs2_dlm_lock",
|
|
ret, lockres);
|
|
}
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
goto out;
|
|
}
|
|
|
|
mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n",
|
|
lockres->l_name);
|
|
|
|
/* At this point we've gone inside the dlm and need to
|
|
* complete our work regardless. */
|
|
catch_signals = 0;
|
|
|
|
/* wait for busy to clear and carry on */
|
|
goto again;
|
|
}
|
|
|
|
update_holders:
|
|
/* Ok, if we get here then we're good to go. */
|
|
ocfs2_inc_holders(lockres, level);
|
|
|
|
ret = 0;
|
|
unlock:
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
|
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
out:
|
|
/*
|
|
* This is helping work around a lock inversion between the page lock
|
|
* and dlm locks. One path holds the page lock while calling aops
|
|
* which block acquiring dlm locks. The voting thread holds dlm
|
|
* locks while acquiring page locks while down converting data locks.
|
|
* This block is helping an aop path notice the inversion and back
|
|
* off to unlock its page lock before trying the dlm lock again.
|
|
*/
|
|
if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
|
|
mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
|
|
wait = 0;
|
|
if (lockres_remove_mask_waiter(lockres, &mw))
|
|
ret = -EAGAIN;
|
|
else
|
|
goto again;
|
|
}
|
|
if (wait) {
|
|
ret = ocfs2_wait_for_mask(&mw);
|
|
if (ret == 0)
|
|
goto again;
|
|
mlog_errno(ret);
|
|
}
|
|
ocfs2_update_lock_stats(lockres, level, &mw, ret);
|
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
if (!ret && lockres->l_lockdep_map.key != NULL) {
|
|
if (level == DLM_LOCK_PR)
|
|
rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass,
|
|
!!(arg_flags & OCFS2_META_LOCK_NOQUEUE),
|
|
caller_ip);
|
|
else
|
|
rwsem_acquire(&lockres->l_lockdep_map, l_subclass,
|
|
!!(arg_flags & OCFS2_META_LOCK_NOQUEUE),
|
|
caller_ip);
|
|
}
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_cluster_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level,
|
|
u32 lkm_flags,
|
|
int arg_flags)
|
|
{
|
|
return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags,
|
|
0, _RET_IP_);
|
|
}
|
|
|
|
|
|
static void __ocfs2_cluster_unlock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level,
|
|
unsigned long caller_ip)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
ocfs2_dec_holders(lockres, level);
|
|
ocfs2_downconvert_on_unlock(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
if (lockres->l_lockdep_map.key != NULL)
|
|
rwsem_release(&lockres->l_lockdep_map, 1, caller_ip);
|
|
#endif
|
|
}
|
|
|
|
static int ocfs2_create_new_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int ex,
|
|
int local)
|
|
{
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
unsigned long flags;
|
|
u32 lkm_flags = local ? DLM_LKF_LOCAL : 0;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
|
|
lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
return ocfs2_lock_create(osb, lockres, level, lkm_flags);
|
|
}
|
|
|
|
/* Grants us an EX lock on the data and metadata resources, skipping
|
|
* the normal cluster directory lookup. Use this ONLY on newly created
|
|
* inodes which other nodes can't possibly see, and which haven't been
|
|
* hashed in the inode hash yet. This can give us a good performance
|
|
* increase as it'll skip the network broadcast normally associated
|
|
* with creating a new lock resource. */
|
|
int ocfs2_create_new_inode_locks(struct inode *inode)
|
|
{
|
|
int ret;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
BUG_ON(!inode);
|
|
BUG_ON(!ocfs2_inode_is_new(inode));
|
|
|
|
mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
/* NOTE: That we don't increment any of the holder counts, nor
|
|
* do we add anything to a journal handle. Since this is
|
|
* supposed to be a new inode which the cluster doesn't know
|
|
* about yet, there is no need to. As far as the LVB handling
|
|
* is concerned, this is basically like acquiring an EX lock
|
|
* on a resource which has an invalid one -- we'll set it
|
|
* valid when we release the EX. */
|
|
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* We don't want to use DLM_LKF_LOCAL on a meta data lock as they
|
|
* don't use a generation in their lock names.
|
|
*/
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_rw_lock(struct inode *inode, int write)
|
|
{
|
|
int status, level;
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog(0, "inode %llu take %s RW lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
lockres = &OCFS2_I(inode)->ip_rw_lockres;
|
|
|
|
level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
|
|
0);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_rw_unlock(struct inode *inode, int write)
|
|
{
|
|
int level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
mlog(0, "inode %llu drop %s RW lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
if (!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
|
}
|
|
|
|
/*
|
|
* ocfs2_open_lock always get PR mode lock.
|
|
*/
|
|
int ocfs2_open_lock(struct inode *inode)
|
|
{
|
|
int status = 0;
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog(0, "inode %llu take PRMODE open lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
goto out;
|
|
|
|
lockres = &OCFS2_I(inode)->ip_open_lockres;
|
|
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
|
|
DLM_LOCK_PR, 0, 0);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_try_open_lock(struct inode *inode, int write)
|
|
{
|
|
int status = 0, level;
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog(0, "inode %llu try to take %s open lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
goto out;
|
|
|
|
lockres = &OCFS2_I(inode)->ip_open_lockres;
|
|
|
|
level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
|
|
/*
|
|
* The file system may already holding a PRMODE/EXMODE open lock.
|
|
* Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on
|
|
* other nodes and the -EAGAIN will indicate to the caller that
|
|
* this inode is still in use.
|
|
*/
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
|
|
level, DLM_LKF_NOQUEUE, 0);
|
|
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* ocfs2_open_unlock unlock PR and EX mode open locks.
|
|
*/
|
|
void ocfs2_open_unlock(struct inode *inode)
|
|
{
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
mlog(0, "inode %llu drop open lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
goto out;
|
|
|
|
if(lockres->l_ro_holders)
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
|
|
DLM_LOCK_PR);
|
|
if(lockres->l_ex_holders)
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
|
|
DLM_LOCK_EX);
|
|
|
|
out:
|
|
return;
|
|
}
|
|
|
|
static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
int ret;
|
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
|
|
unsigned long flags;
|
|
struct ocfs2_mask_waiter mw;
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
retry_cancel:
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
|
ret = ocfs2_prepare_cancel_convert(osb, lockres);
|
|
if (ret) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ret = ocfs2_cancel_convert(osb, lockres);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
goto retry_cancel;
|
|
}
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ocfs2_wait_for_mask(&mw);
|
|
goto retry_cancel;
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
/*
|
|
* We may still have gotten the lock, in which case there's no
|
|
* point to restarting the syscall.
|
|
*/
|
|
if (lockres->l_level == level)
|
|
ret = 0;
|
|
|
|
mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret,
|
|
lockres->l_flags, lockres->l_level, lockres->l_action);
|
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of
|
|
* flock() calls. The locking approach this requires is sufficiently
|
|
* different from all other cluster lock types that we implement a
|
|
* separate path to the "low-level" dlm calls. In particular:
|
|
*
|
|
* - No optimization of lock levels is done - we take at exactly
|
|
* what's been requested.
|
|
*
|
|
* - No lock caching is employed. We immediately downconvert to
|
|
* no-lock at unlock time. This also means flock locks never go on
|
|
* the blocking list).
|
|
*
|
|
* - Since userspace can trivially deadlock itself with flock, we make
|
|
* sure to allow cancellation of a misbehaving applications flock()
|
|
* request.
|
|
*
|
|
* - Access to any flock lockres doesn't require concurrency, so we
|
|
* can simplify the code by requiring the caller to guarantee
|
|
* serialization of dlmglue flock calls.
|
|
*/
|
|
int ocfs2_file_lock(struct file *file, int ex, int trylock)
|
|
{
|
|
int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0;
|
|
unsigned long flags;
|
|
struct ocfs2_file_private *fp = file->private_data;
|
|
struct ocfs2_lock_res *lockres = &fp->fp_flock;
|
|
struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
|
|
struct ocfs2_mask_waiter mw;
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
if ((lockres->l_flags & OCFS2_LOCK_BUSY) ||
|
|
(lockres->l_level > DLM_LOCK_NL)) {
|
|
mlog(ML_ERROR,
|
|
"File lock \"%s\" has busy or locked state: flags: 0x%lx, "
|
|
"level: %u\n", lockres->l_name, lockres->l_flags,
|
|
lockres->l_level);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
/*
|
|
* Get the lock at NLMODE to start - that way we
|
|
* can cancel the upconvert request if need be.
|
|
*/
|
|
ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_wait_for_mask(&mw);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
}
|
|
|
|
lockres->l_action = OCFS2_AST_CONVERT;
|
|
lkm_flags |= DLM_LKF_CONVERT;
|
|
lockres->l_requested = level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags,
|
|
lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1);
|
|
if (ret) {
|
|
if (!trylock || (ret != -EAGAIN)) {
|
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
lockres_remove_mask_waiter(lockres, &mw);
|
|
goto out;
|
|
}
|
|
|
|
ret = ocfs2_wait_for_mask_interruptible(&mw, lockres);
|
|
if (ret == -ERESTARTSYS) {
|
|
/*
|
|
* Userspace can cause deadlock itself with
|
|
* flock(). Current behavior locally is to allow the
|
|
* deadlock, but abort the system call if a signal is
|
|
* received. We follow this example, otherwise a
|
|
* poorly written program could sit in kernel until
|
|
* reboot.
|
|
*
|
|
* Handling this is a bit more complicated for Ocfs2
|
|
* though. We can't exit this function with an
|
|
* outstanding lock request, so a cancel convert is
|
|
* required. We intentionally overwrite 'ret' - if the
|
|
* cancel fails and the lock was granted, it's easier
|
|
* to just bubble success back up to the user.
|
|
*/
|
|
ret = ocfs2_flock_handle_signal(lockres, level);
|
|
} else if (!ret && (level > lockres->l_level)) {
|
|
/* Trylock failed asynchronously */
|
|
BUG_ON(!trylock);
|
|
ret = -EAGAIN;
|
|
}
|
|
|
|
out:
|
|
|
|
mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n",
|
|
lockres->l_name, ex, trylock, ret);
|
|
return ret;
|
|
}
|
|
|
|
void ocfs2_file_unlock(struct file *file)
|
|
{
|
|
int ret;
|
|
unsigned int gen;
|
|
unsigned long flags;
|
|
struct ocfs2_file_private *fp = file->private_data;
|
|
struct ocfs2_lock_res *lockres = &fp->fp_flock;
|
|
struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
|
|
struct ocfs2_mask_waiter mw;
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED))
|
|
return;
|
|
|
|
if (lockres->l_level == DLM_LOCK_NL)
|
|
return;
|
|
|
|
mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n",
|
|
lockres->l_name, lockres->l_flags, lockres->l_level,
|
|
lockres->l_action);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
/*
|
|
* Fake a blocking ast for the downconvert code.
|
|
*/
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
|
|
lockres->l_blocking = DLM_LOCK_EX;
|
|
|
|
gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL);
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
return;
|
|
}
|
|
|
|
ret = ocfs2_wait_for_mask(&mw);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int kick = 0;
|
|
|
|
/* If we know that another node is waiting on our lock, kick
|
|
* the downconvert thread * pre-emptively when we reach a release
|
|
* condition. */
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
|
|
switch(lockres->l_blocking) {
|
|
case DLM_LOCK_EX:
|
|
if (!lockres->l_ex_holders && !lockres->l_ro_holders)
|
|
kick = 1;
|
|
break;
|
|
case DLM_LOCK_PR:
|
|
if (!lockres->l_ex_holders)
|
|
kick = 1;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
if (kick)
|
|
ocfs2_wake_downconvert_thread(osb);
|
|
}
|
|
|
|
#define OCFS2_SEC_BITS 34
|
|
#define OCFS2_SEC_SHIFT (64 - 34)
|
|
#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
|
|
|
|
/* LVB only has room for 64 bits of time here so we pack it for
|
|
* now. */
|
|
static u64 ocfs2_pack_timespec(struct timespec *spec)
|
|
{
|
|
u64 res;
|
|
u64 sec = spec->tv_sec;
|
|
u32 nsec = spec->tv_nsec;
|
|
|
|
res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Call this with the lockres locked. I am reasonably sure we don't
|
|
* need ip_lock in this function as anyone who would be changing those
|
|
* values is supposed to be blocked in ocfs2_inode_lock right now. */
|
|
static void __ocfs2_stuff_meta_lvb(struct inode *inode)
|
|
{
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
|
|
struct ocfs2_meta_lvb *lvb;
|
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
|
|
/*
|
|
* Invalidate the LVB of a deleted inode - this way other
|
|
* nodes are forced to go to disk and discover the new inode
|
|
* status.
|
|
*/
|
|
if (oi->ip_flags & OCFS2_INODE_DELETED) {
|
|
lvb->lvb_version = 0;
|
|
goto out;
|
|
}
|
|
|
|
lvb->lvb_version = OCFS2_LVB_VERSION;
|
|
lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
|
|
lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
|
|
lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
|
|
lvb->lvb_igid = cpu_to_be32(inode->i_gid);
|
|
lvb->lvb_imode = cpu_to_be16(inode->i_mode);
|
|
lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
|
|
lvb->lvb_iatime_packed =
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
|
|
lvb->lvb_ictime_packed =
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
|
|
lvb->lvb_imtime_packed =
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
|
|
lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
|
|
lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features);
|
|
lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
|
|
|
|
out:
|
|
mlog_meta_lvb(0, lockres);
|
|
}
|
|
|
|
static void ocfs2_unpack_timespec(struct timespec *spec,
|
|
u64 packed_time)
|
|
{
|
|
spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
|
|
spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
|
|
}
|
|
|
|
static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
|
|
{
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
|
|
struct ocfs2_meta_lvb *lvb;
|
|
|
|
mlog_meta_lvb(0, lockres);
|
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
|
|
/* We're safe here without the lockres lock... */
|
|
spin_lock(&oi->ip_lock);
|
|
oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
|
|
i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
|
|
|
|
oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
|
|
oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures);
|
|
ocfs2_set_inode_flags(inode);
|
|
|
|
/* fast-symlinks are a special case */
|
|
if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
|
|
inode->i_blocks = 0;
|
|
else
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
|
|
|
inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
|
|
inode->i_gid = be32_to_cpu(lvb->lvb_igid);
|
|
inode->i_mode = be16_to_cpu(lvb->lvb_imode);
|
|
inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
|
|
ocfs2_unpack_timespec(&inode->i_atime,
|
|
be64_to_cpu(lvb->lvb_iatime_packed));
|
|
ocfs2_unpack_timespec(&inode->i_mtime,
|
|
be64_to_cpu(lvb->lvb_imtime_packed));
|
|
ocfs2_unpack_timespec(&inode->i_ctime,
|
|
be64_to_cpu(lvb->lvb_ictime_packed));
|
|
spin_unlock(&oi->ip_lock);
|
|
}
|
|
|
|
static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
|
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb)
|
|
&& lvb->lvb_version == OCFS2_LVB_VERSION
|
|
&& be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Determine whether a lock resource needs to be refreshed, and
|
|
* arbitrate who gets to refresh it.
|
|
*
|
|
* 0 means no refresh needed.
|
|
*
|
|
* > 0 means you need to refresh this and you MUST call
|
|
* ocfs2_complete_lock_res_refresh afterwards. */
|
|
static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
|
|
{
|
|
unsigned long flags;
|
|
int status = 0;
|
|
|
|
refresh_check:
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto bail;
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ocfs2_wait_on_refreshing_lock(lockres);
|
|
goto refresh_check;
|
|
}
|
|
|
|
/* Ok, I'll be the one to refresh this lock. */
|
|
lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
status = 1;
|
|
bail:
|
|
mlog(0, "status %d\n", status);
|
|
return status;
|
|
}
|
|
|
|
/* If status is non zero, I'll mark it as not being in refresh
|
|
* anymroe, but i won't clear the needs refresh flag. */
|
|
static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
|
|
int status)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
|
|
if (!status)
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
}
|
|
|
|
/* may or may not return a bh if it went to disk. */
|
|
static int ocfs2_inode_lock_update(struct inode *inode,
|
|
struct buffer_head **bh)
|
|
{
|
|
int status = 0;
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
|
|
struct ocfs2_dinode *fe;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
goto bail;
|
|
|
|
spin_lock(&oi->ip_lock);
|
|
if (oi->ip_flags & OCFS2_INODE_DELETED) {
|
|
mlog(0, "Orphaned inode %llu was deleted while we "
|
|
"were waiting on a lock. ip_flags = 0x%x\n",
|
|
(unsigned long long)oi->ip_blkno, oi->ip_flags);
|
|
spin_unlock(&oi->ip_lock);
|
|
status = -ENOENT;
|
|
goto bail;
|
|
}
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
if (!ocfs2_should_refresh_lock_res(lockres))
|
|
goto bail;
|
|
|
|
/* This will discard any caching information we might have had
|
|
* for the inode metadata. */
|
|
ocfs2_metadata_cache_purge(INODE_CACHE(inode));
|
|
|
|
ocfs2_extent_map_trunc(inode, 0);
|
|
|
|
if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
|
|
mlog(0, "Trusting LVB on inode %llu\n",
|
|
(unsigned long long)oi->ip_blkno);
|
|
ocfs2_refresh_inode_from_lvb(inode);
|
|
} else {
|
|
/* Boo, we have to go to disk. */
|
|
/* read bh, cast, ocfs2_refresh_inode */
|
|
status = ocfs2_read_inode_block(inode, bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_refresh;
|
|
}
|
|
fe = (struct ocfs2_dinode *) (*bh)->b_data;
|
|
|
|
/* This is a good chance to make sure we're not
|
|
* locking an invalid object. ocfs2_read_inode_block()
|
|
* already checked that the inode block is sane.
|
|
*
|
|
* We bug on a stale inode here because we checked
|
|
* above whether it was wiped from disk. The wiping
|
|
* node provides a guarantee that we receive that
|
|
* message and can mark the inode before dropping any
|
|
* locks associated with it. */
|
|
mlog_bug_on_msg(inode->i_generation !=
|
|
le32_to_cpu(fe->i_generation),
|
|
"Invalid dinode %llu disk generation: %u "
|
|
"inode->i_generation: %u\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
le32_to_cpu(fe->i_generation),
|
|
inode->i_generation);
|
|
mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
|
|
!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
|
|
"Stale dinode %llu dtime: %llu flags: 0x%x\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
(unsigned long long)le64_to_cpu(fe->i_dtime),
|
|
le32_to_cpu(fe->i_flags));
|
|
|
|
ocfs2_refresh_inode(inode, fe);
|
|
ocfs2_track_lock_refresh(lockres);
|
|
}
|
|
|
|
status = 0;
|
|
bail_refresh:
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_assign_bh(struct inode *inode,
|
|
struct buffer_head **ret_bh,
|
|
struct buffer_head *passed_bh)
|
|
{
|
|
int status;
|
|
|
|
if (passed_bh) {
|
|
/* Ok, the update went to disk for us, use the
|
|
* returned bh. */
|
|
*ret_bh = passed_bh;
|
|
get_bh(*ret_bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
status = ocfs2_read_inode_block(inode, ret_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* returns < 0 error if the callback will never be called, otherwise
|
|
* the result of the lock will be communicated via the callback.
|
|
*/
|
|
int ocfs2_inode_lock_full_nested(struct inode *inode,
|
|
struct buffer_head **ret_bh,
|
|
int ex,
|
|
int arg_flags,
|
|
int subclass)
|
|
{
|
|
int status, level, acquired;
|
|
u32 dlm_flags;
|
|
struct ocfs2_lock_res *lockres = NULL;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct buffer_head *local_bh = NULL;
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog(0, "inode %llu, take %s META lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
ex ? "EXMODE" : "PRMODE");
|
|
|
|
status = 0;
|
|
acquired = 0;
|
|
/* We'll allow faking a readonly metadata lock for
|
|
* rodevices. */
|
|
if (ocfs2_is_hard_readonly(osb)) {
|
|
if (ex)
|
|
status = -EROFS;
|
|
goto bail;
|
|
}
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
goto local;
|
|
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
|
|
ocfs2_wait_for_recovery(osb);
|
|
|
|
lockres = &OCFS2_I(inode)->ip_inode_lockres;
|
|
level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
dlm_flags = 0;
|
|
if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
|
|
dlm_flags |= DLM_LKF_NOQUEUE;
|
|
|
|
status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags,
|
|
arg_flags, subclass, _RET_IP_);
|
|
if (status < 0) {
|
|
if (status != -EAGAIN && status != -EIOCBRETRY)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* Notify the error cleanup path to drop the cluster lock. */
|
|
acquired = 1;
|
|
|
|
/* We wait twice because a node may have died while we were in
|
|
* the lower dlm layers. The second time though, we've
|
|
* committed to owning this lock so we don't allow signals to
|
|
* abort the operation. */
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
|
|
ocfs2_wait_for_recovery(osb);
|
|
|
|
local:
|
|
/*
|
|
* We only see this flag if we're being called from
|
|
* ocfs2_read_locked_inode(). It means we're locking an inode
|
|
* which hasn't been populated yet, so clear the refresh flag
|
|
* and let the caller handle it.
|
|
*/
|
|
if (inode->i_state & I_NEW) {
|
|
status = 0;
|
|
if (lockres)
|
|
ocfs2_complete_lock_res_refresh(lockres, 0);
|
|
goto bail;
|
|
}
|
|
|
|
/* This is fun. The caller may want a bh back, or it may
|
|
* not. ocfs2_inode_lock_update definitely wants one in, but
|
|
* may or may not read one, depending on what's in the
|
|
* LVB. The result of all of this is that we've *only* gone to
|
|
* disk if we have to, so the complexity is worthwhile. */
|
|
status = ocfs2_inode_lock_update(inode, &local_bh);
|
|
if (status < 0) {
|
|
if (status != -ENOENT)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (ret_bh) {
|
|
status = ocfs2_assign_bh(inode, ret_bh, local_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
bail:
|
|
if (status < 0) {
|
|
if (ret_bh && (*ret_bh)) {
|
|
brelse(*ret_bh);
|
|
*ret_bh = NULL;
|
|
}
|
|
if (acquired)
|
|
ocfs2_inode_unlock(inode, ex);
|
|
}
|
|
|
|
if (local_bh)
|
|
brelse(local_bh);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* This is working around a lock inversion between tasks acquiring DLM
|
|
* locks while holding a page lock and the downconvert thread which
|
|
* blocks dlm lock acquiry while acquiring page locks.
|
|
*
|
|
* ** These _with_page variantes are only intended to be called from aop
|
|
* methods that hold page locks and return a very specific *positive* error
|
|
* code that aop methods pass up to the VFS -- test for errors with != 0. **
|
|
*
|
|
* The DLM is called such that it returns -EAGAIN if it would have
|
|
* blocked waiting for the downconvert thread. In that case we unlock
|
|
* our page so the downconvert thread can make progress. Once we've
|
|
* done this we have to return AOP_TRUNCATED_PAGE so the aop method
|
|
* that called us can bubble that back up into the VFS who will then
|
|
* immediately retry the aop call.
|
|
*
|
|
* We do a blocking lock and immediate unlock before returning, though, so that
|
|
* the lock has a great chance of being cached on this node by the time the VFS
|
|
* calls back to retry the aop. This has a potential to livelock as nodes
|
|
* ping locks back and forth, but that's a risk we're willing to take to avoid
|
|
* the lock inversion simply.
|
|
*/
|
|
int ocfs2_inode_lock_with_page(struct inode *inode,
|
|
struct buffer_head **ret_bh,
|
|
int ex,
|
|
struct page *page)
|
|
{
|
|
int ret;
|
|
|
|
ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK);
|
|
if (ret == -EAGAIN) {
|
|
unlock_page(page);
|
|
if (ocfs2_inode_lock(inode, ret_bh, ex) == 0)
|
|
ocfs2_inode_unlock(inode, ex);
|
|
ret = AOP_TRUNCATED_PAGE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_inode_lock_atime(struct inode *inode,
|
|
struct vfsmount *vfsmnt,
|
|
int *level)
|
|
{
|
|
int ret;
|
|
|
|
ret = ocfs2_inode_lock(inode, NULL, 0);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If we should update atime, we will get EX lock,
|
|
* otherwise we just get PR lock.
|
|
*/
|
|
if (ocfs2_should_update_atime(inode, vfsmnt)) {
|
|
struct buffer_head *bh = NULL;
|
|
|
|
ocfs2_inode_unlock(inode, 0);
|
|
ret = ocfs2_inode_lock(inode, &bh, 1);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
return ret;
|
|
}
|
|
*level = 1;
|
|
if (ocfs2_should_update_atime(inode, vfsmnt))
|
|
ocfs2_update_inode_atime(inode, bh);
|
|
if (bh)
|
|
brelse(bh);
|
|
} else
|
|
*level = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ocfs2_inode_unlock(struct inode *inode,
|
|
int ex)
|
|
{
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
mlog(0, "inode %llu drop %s META lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
ex ? "EXMODE" : "PRMODE");
|
|
|
|
if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
|
|
!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
|
}
|
|
|
|
int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno)
|
|
{
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_orphan_scan_lvb *lvb;
|
|
int status = 0;
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
lockres = &osb->osb_orphan_scan.os_lockres;
|
|
status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
|
|
lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION)
|
|
*seqno = be32_to_cpu(lvb->lvb_os_seqno);
|
|
else
|
|
*seqno = osb->osb_orphan_scan.os_seqno + 1;
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno)
|
|
{
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_orphan_scan_lvb *lvb;
|
|
|
|
if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) {
|
|
lockres = &osb->osb_orphan_scan.os_lockres;
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION;
|
|
lvb->lvb_os_seqno = cpu_to_be32(seqno);
|
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
|
|
}
|
|
}
|
|
|
|
int ocfs2_super_lock(struct ocfs2_super *osb,
|
|
int ex)
|
|
{
|
|
int status = 0;
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
goto bail;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* The super block lock path is really in the best position to
|
|
* know when resources covered by the lock need to be
|
|
* refreshed, so we do it here. Of course, making sense of
|
|
* everything is up to the caller :) */
|
|
status = ocfs2_should_refresh_lock_res(lockres);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
if (status) {
|
|
status = ocfs2_refresh_slot_info(osb);
|
|
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
|
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
ocfs2_track_lock_refresh(lockres);
|
|
}
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_super_unlock(struct ocfs2_super *osb,
|
|
int ex)
|
|
{
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
|
|
|
|
if (!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(osb, lockres, level);
|
|
}
|
|
|
|
int ocfs2_rename_lock(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_rename_unlock(struct ocfs2_super *osb)
|
|
{
|
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
|
|
|
|
if (!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
|
|
}
|
|
|
|
int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex)
|
|
{
|
|
int status;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE,
|
|
0, 0);
|
|
if (status < 0)
|
|
mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status);
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex)
|
|
{
|
|
struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
|
|
|
|
if (!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(osb, lockres,
|
|
ex ? LKM_EXMODE : LKM_PRMODE);
|
|
}
|
|
|
|
int ocfs2_dentry_lock(struct dentry *dentry, int ex)
|
|
{
|
|
int ret;
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
|
|
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
|
|
|
|
BUG_ON(!dl);
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
|
|
{
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
|
|
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
|
|
|
|
if (!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
|
|
}
|
|
|
|
/* Reference counting of the dlm debug structure. We want this because
|
|
* open references on the debug inodes can live on after a mount, so
|
|
* we can't rely on the ocfs2_super to always exist. */
|
|
static void ocfs2_dlm_debug_free(struct kref *kref)
|
|
{
|
|
struct ocfs2_dlm_debug *dlm_debug;
|
|
|
|
dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
|
|
|
|
kfree(dlm_debug);
|
|
}
|
|
|
|
void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
|
|
{
|
|
if (dlm_debug)
|
|
kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
|
|
}
|
|
|
|
static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
|
|
{
|
|
kref_get(&debug->d_refcnt);
|
|
}
|
|
|
|
struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
|
|
{
|
|
struct ocfs2_dlm_debug *dlm_debug;
|
|
|
|
dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
|
|
if (!dlm_debug) {
|
|
mlog_errno(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
kref_init(&dlm_debug->d_refcnt);
|
|
INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
|
|
dlm_debug->d_locking_state = NULL;
|
|
out:
|
|
return dlm_debug;
|
|
}
|
|
|
|
/* Access to this is arbitrated for us via seq_file->sem. */
|
|
struct ocfs2_dlm_seq_priv {
|
|
struct ocfs2_dlm_debug *p_dlm_debug;
|
|
struct ocfs2_lock_res p_iter_res;
|
|
struct ocfs2_lock_res p_tmp_res;
|
|
};
|
|
|
|
static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
|
|
struct ocfs2_dlm_seq_priv *priv)
|
|
{
|
|
struct ocfs2_lock_res *iter, *ret = NULL;
|
|
struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
|
|
|
|
assert_spin_locked(&ocfs2_dlm_tracking_lock);
|
|
|
|
list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
|
|
/* discover the head of the list */
|
|
if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
|
|
mlog(0, "End of list found, %p\n", ret);
|
|
break;
|
|
}
|
|
|
|
/* We track our "dummy" iteration lockres' by a NULL
|
|
* l_ops field. */
|
|
if (iter->l_ops != NULL) {
|
|
ret = iter;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
struct ocfs2_dlm_seq_priv *priv = m->private;
|
|
struct ocfs2_lock_res *iter;
|
|
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
|
iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
|
|
if (iter) {
|
|
/* Since lockres' have the lifetime of their container
|
|
* (which can be inodes, ocfs2_supers, etc) we want to
|
|
* copy this out to a temporary lockres while still
|
|
* under the spinlock. Obviously after this we can't
|
|
* trust any pointers on the copy returned, but that's
|
|
* ok as the information we want isn't typically held
|
|
* in them. */
|
|
priv->p_tmp_res = *iter;
|
|
iter = &priv->p_tmp_res;
|
|
}
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
|
|
|
return iter;
|
|
}
|
|
|
|
static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
struct ocfs2_dlm_seq_priv *priv = m->private;
|
|
struct ocfs2_lock_res *iter = v;
|
|
struct ocfs2_lock_res *dummy = &priv->p_iter_res;
|
|
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
|
iter = ocfs2_dlm_next_res(iter, priv);
|
|
list_del_init(&dummy->l_debug_list);
|
|
if (iter) {
|
|
list_add(&dummy->l_debug_list, &iter->l_debug_list);
|
|
priv->p_tmp_res = *iter;
|
|
iter = &priv->p_tmp_res;
|
|
}
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
|
|
|
return iter;
|
|
}
|
|
|
|
/*
|
|
* Version is used by debugfs.ocfs2 to determine the format being used
|
|
*
|
|
* New in version 2
|
|
* - Lock stats printed
|
|
* New in version 3
|
|
* - Max time in lock stats is in usecs (instead of nsecs)
|
|
*/
|
|
#define OCFS2_DLM_DEBUG_STR_VERSION 3
|
|
static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
char *lvb;
|
|
struct ocfs2_lock_res *lockres = v;
|
|
|
|
if (!lockres)
|
|
return -EINVAL;
|
|
|
|
seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
|
|
|
|
if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
|
|
seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
|
|
lockres->l_name,
|
|
(unsigned int)ocfs2_get_dentry_lock_ino(lockres));
|
|
else
|
|
seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
|
|
|
|
seq_printf(m, "%d\t"
|
|
"0x%lx\t"
|
|
"0x%x\t"
|
|
"0x%x\t"
|
|
"%u\t"
|
|
"%u\t"
|
|
"%d\t"
|
|
"%d\t",
|
|
lockres->l_level,
|
|
lockres->l_flags,
|
|
lockres->l_action,
|
|
lockres->l_unlock_action,
|
|
lockres->l_ro_holders,
|
|
lockres->l_ex_holders,
|
|
lockres->l_requested,
|
|
lockres->l_blocking);
|
|
|
|
/* Dump the raw LVB */
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
for(i = 0; i < DLM_LVB_LEN; i++)
|
|
seq_printf(m, "0x%x\t", lvb[i]);
|
|
|
|
#ifdef CONFIG_OCFS2_FS_STATS
|
|
# define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets)
|
|
# define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets)
|
|
# define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail)
|
|
# define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail)
|
|
# define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total)
|
|
# define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total)
|
|
# define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max)
|
|
# define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max)
|
|
# define lock_refresh(_l) ((_l)->l_lock_refresh)
|
|
#else
|
|
# define lock_num_prmode(_l) (0)
|
|
# define lock_num_exmode(_l) (0)
|
|
# define lock_num_prmode_failed(_l) (0)
|
|
# define lock_num_exmode_failed(_l) (0)
|
|
# define lock_total_prmode(_l) (0ULL)
|
|
# define lock_total_exmode(_l) (0ULL)
|
|
# define lock_max_prmode(_l) (0)
|
|
# define lock_max_exmode(_l) (0)
|
|
# define lock_refresh(_l) (0)
|
|
#endif
|
|
/* The following seq_print was added in version 2 of this output */
|
|
seq_printf(m, "%u\t"
|
|
"%u\t"
|
|
"%u\t"
|
|
"%u\t"
|
|
"%llu\t"
|
|
"%llu\t"
|
|
"%u\t"
|
|
"%u\t"
|
|
"%u\t",
|
|
lock_num_prmode(lockres),
|
|
lock_num_exmode(lockres),
|
|
lock_num_prmode_failed(lockres),
|
|
lock_num_exmode_failed(lockres),
|
|
lock_total_prmode(lockres),
|
|
lock_total_exmode(lockres),
|
|
lock_max_prmode(lockres),
|
|
lock_max_exmode(lockres),
|
|
lock_refresh(lockres));
|
|
|
|
/* End the line */
|
|
seq_printf(m, "\n");
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ocfs2_dlm_seq_ops = {
|
|
.start = ocfs2_dlm_seq_start,
|
|
.stop = ocfs2_dlm_seq_stop,
|
|
.next = ocfs2_dlm_seq_next,
|
|
.show = ocfs2_dlm_seq_show,
|
|
};
|
|
|
|
static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
struct ocfs2_dlm_seq_priv *priv = seq->private;
|
|
struct ocfs2_lock_res *res = &priv->p_iter_res;
|
|
|
|
ocfs2_remove_lockres_tracking(res);
|
|
ocfs2_put_dlm_debug(priv->p_dlm_debug);
|
|
return seq_release_private(inode, file);
|
|
}
|
|
|
|
static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret;
|
|
struct ocfs2_dlm_seq_priv *priv;
|
|
struct seq_file *seq;
|
|
struct ocfs2_super *osb;
|
|
|
|
priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
osb = inode->i_private;
|
|
ocfs2_get_dlm_debug(osb->osb_dlm_debug);
|
|
priv->p_dlm_debug = osb->osb_dlm_debug;
|
|
INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
|
|
|
|
ret = seq_open(file, &ocfs2_dlm_seq_ops);
|
|
if (ret) {
|
|
kfree(priv);
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
seq = file->private_data;
|
|
seq->private = priv;
|
|
|
|
ocfs2_add_lockres_tracking(&priv->p_iter_res,
|
|
priv->p_dlm_debug);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations ocfs2_dlm_debug_fops = {
|
|
.open = ocfs2_dlm_debug_open,
|
|
.release = ocfs2_dlm_debug_release,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
};
|
|
|
|
static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
|
|
{
|
|
int ret = 0;
|
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
|
|
|
|
dlm_debug->d_locking_state = debugfs_create_file("locking_state",
|
|
S_IFREG|S_IRUSR,
|
|
osb->osb_debug_root,
|
|
osb,
|
|
&ocfs2_dlm_debug_fops);
|
|
if (!dlm_debug->d_locking_state) {
|
|
ret = -EINVAL;
|
|
mlog(ML_ERROR,
|
|
"Unable to create locking state debugfs file.\n");
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_get_dlm_debug(dlm_debug);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
|
|
{
|
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
|
|
|
|
if (dlm_debug) {
|
|
debugfs_remove(dlm_debug->d_locking_state);
|
|
ocfs2_put_dlm_debug(dlm_debug);
|
|
}
|
|
}
|
|
|
|
int ocfs2_dlm_init(struct ocfs2_super *osb)
|
|
{
|
|
int status = 0;
|
|
struct ocfs2_cluster_connection *conn = NULL;
|
|
|
|
if (ocfs2_mount_local(osb)) {
|
|
osb->node_num = 0;
|
|
goto local;
|
|
}
|
|
|
|
status = ocfs2_dlm_init_debug(osb);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* launch downconvert thread */
|
|
osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc");
|
|
if (IS_ERR(osb->dc_task)) {
|
|
status = PTR_ERR(osb->dc_task);
|
|
osb->dc_task = NULL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* for now, uuid == domain */
|
|
status = ocfs2_cluster_connect(osb->osb_cluster_stack,
|
|
osb->uuid_str,
|
|
strlen(osb->uuid_str),
|
|
&lproto, ocfs2_do_node_down, osb,
|
|
&conn);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_cluster_this_node(&osb->node_num);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
mlog(ML_ERROR,
|
|
"could not find this host's node number\n");
|
|
ocfs2_cluster_disconnect(conn, 0);
|
|
goto bail;
|
|
}
|
|
|
|
local:
|
|
ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
|
|
ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
|
|
ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb);
|
|
ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb);
|
|
|
|
osb->cconn = conn;
|
|
|
|
status = 0;
|
|
bail:
|
|
if (status < 0) {
|
|
ocfs2_dlm_shutdown_debug(osb);
|
|
if (osb->dc_task)
|
|
kthread_stop(osb->dc_task);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
|
|
int hangup_pending)
|
|
{
|
|
ocfs2_drop_osb_locks(osb);
|
|
|
|
/*
|
|
* Now that we have dropped all locks and ocfs2_dismount_volume()
|
|
* has disabled recovery, the DLM won't be talking to us. It's
|
|
* safe to tear things down before disconnecting the cluster.
|
|
*/
|
|
|
|
if (osb->dc_task) {
|
|
kthread_stop(osb->dc_task);
|
|
osb->dc_task = NULL;
|
|
}
|
|
|
|
ocfs2_lock_res_free(&osb->osb_super_lockres);
|
|
ocfs2_lock_res_free(&osb->osb_rename_lockres);
|
|
ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
|
|
ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres);
|
|
|
|
ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
|
|
osb->cconn = NULL;
|
|
|
|
ocfs2_dlm_shutdown_debug(osb);
|
|
}
|
|
|
|
static int ocfs2_drop_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int ret;
|
|
unsigned long flags;
|
|
u32 lkm_flags = 0;
|
|
|
|
/* We didn't get anywhere near actually using this lockres. */
|
|
if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
|
|
goto out;
|
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
|
|
lkm_flags |= DLM_LKF_VALBLK;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
|
|
"lockres %s, flags 0x%lx\n",
|
|
lockres->l_name, lockres->l_flags);
|
|
|
|
while (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
|
mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
|
|
"%u, unlock_action = %u\n",
|
|
lockres->l_name, lockres->l_flags, lockres->l_action,
|
|
lockres->l_unlock_action);
|
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
/* XXX: Today we just wait on any busy
|
|
* locks... Perhaps we need to cancel converts in the
|
|
* future? */
|
|
ocfs2_wait_on_busy_lock(lockres);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
}
|
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
|
|
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
|
|
lockres->l_level == DLM_LOCK_EX &&
|
|
!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
|
|
lockres->l_ops->set_lvb(lockres);
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY)
|
|
mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
|
|
lockres->l_name);
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
|
|
mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
|
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto out;
|
|
}
|
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
|
|
|
|
/* make sure we never get here while waiting for an ast to
|
|
* fire. */
|
|
BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
|
|
|
|
/* is this necessary? */
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
|
|
|
ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags);
|
|
if (ret) {
|
|
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
|
|
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
|
|
ocfs2_dlm_dump_lksb(&lockres->l_lksb);
|
|
BUG();
|
|
}
|
|
mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n",
|
|
lockres->l_name);
|
|
|
|
ocfs2_wait_on_busy_lock(lockres);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/* Mark the lockres as being dropped. It will no longer be
|
|
* queued if blocking, but we still may have to wait on it
|
|
* being dequeued from the downconvert thread before we can consider
|
|
* it safe to drop.
|
|
*
|
|
* You can *not* attempt to call cluster_lock on this lockres anymore. */
|
|
void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
|
|
{
|
|
int status;
|
|
struct ocfs2_mask_waiter mw;
|
|
unsigned long flags;
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
lockres->l_flags |= OCFS2_LOCK_FREEING;
|
|
while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
mlog(0, "Waiting on lockres %s\n", lockres->l_name);
|
|
|
|
status = ocfs2_wait_for_mask(&mw);
|
|
if (status)
|
|
mlog_errno(status);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
}
|
|
|
|
void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int ret;
|
|
|
|
ocfs2_mark_lockres_freeing(lockres);
|
|
ret = ocfs2_drop_lock(osb, lockres);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
|
|
{
|
|
ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
|
|
ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
|
|
ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres);
|
|
ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres);
|
|
}
|
|
|
|
int ocfs2_drop_inode_locks(struct inode *inode)
|
|
{
|
|
int status, err;
|
|
|
|
/* No need to call ocfs2_mark_lockres_freeing here -
|
|
* ocfs2_clear_inode has done it for us. */
|
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
|
&OCFS2_I(inode)->ip_open_lockres);
|
|
if (err < 0)
|
|
mlog_errno(err);
|
|
|
|
status = err;
|
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
|
&OCFS2_I(inode)->ip_inode_lockres);
|
|
if (err < 0)
|
|
mlog_errno(err);
|
|
if (err < 0 && !status)
|
|
status = err;
|
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
|
&OCFS2_I(inode)->ip_rw_lockres);
|
|
if (err < 0)
|
|
mlog_errno(err);
|
|
if (err < 0 && !status)
|
|
status = err;
|
|
|
|
return status;
|
|
}
|
|
|
|
static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
|
|
int new_level)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
|
|
|
|
if (lockres->l_level <= new_level) {
|
|
mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, "
|
|
"type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, "
|
|
"block %d, pgen %d\n", lockres->l_name, lockres->l_level,
|
|
new_level, list_empty(&lockres->l_blocked_list),
|
|
list_empty(&lockres->l_mask_waiters), lockres->l_type,
|
|
lockres->l_flags, lockres->l_ro_holders,
|
|
lockres->l_ex_holders, lockres->l_action,
|
|
lockres->l_unlock_action, lockres->l_requested,
|
|
lockres->l_blocking, lockres->l_pending_gen);
|
|
BUG();
|
|
}
|
|
|
|
mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n",
|
|
lockres->l_name, lockres->l_level, new_level, lockres->l_blocking);
|
|
|
|
lockres->l_action = OCFS2_AST_DOWNCONVERT;
|
|
lockres->l_requested = new_level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
return lockres_set_pending(lockres);
|
|
}
|
|
|
|
static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int new_level,
|
|
int lvb,
|
|
unsigned int generation)
|
|
{
|
|
int ret;
|
|
u32 dlm_flags = DLM_LKF_CONVERT;
|
|
|
|
mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name,
|
|
lockres->l_level, new_level);
|
|
|
|
if (lvb)
|
|
dlm_flags |= DLM_LKF_VALBLK;
|
|
|
|
ret = ocfs2_dlm_lock(osb->cconn,
|
|
new_level,
|
|
&lockres->l_lksb,
|
|
dlm_flags,
|
|
lockres->l_name,
|
|
OCFS2_LOCK_ID_MAX_LEN - 1);
|
|
lockres_clear_pending(lockres, generation, osb);
|
|
if (ret) {
|
|
ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
goto bail;
|
|
}
|
|
|
|
ret = 0;
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
/* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */
|
|
static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
|
|
/* If we're already trying to cancel a lock conversion
|
|
* then just drop the spinlock and allow the caller to
|
|
* requeue this lock. */
|
|
mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name);
|
|
return 0;
|
|
}
|
|
|
|
/* were we in a convert when we got the bast fire? */
|
|
BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
|
|
lockres->l_action != OCFS2_AST_DOWNCONVERT);
|
|
/* set things up for the unlockast to know to just
|
|
* clear out the ast_action and unset busy, etc. */
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
|
|
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
|
|
"lock %s, invalid flags: 0x%lx\n",
|
|
lockres->l_name, lockres->l_flags);
|
|
|
|
mlog(ML_BASTS, "lockres %s\n", lockres->l_name);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ocfs2_cancel_convert(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int ret;
|
|
|
|
ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb,
|
|
DLM_LKF_CANCEL);
|
|
if (ret) {
|
|
ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
|
|
ocfs2_recover_from_dlm_error(lockres, 0);
|
|
}
|
|
|
|
mlog(ML_BASTS, "lockres %s\n", lockres->l_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_unblock_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_unblock_ctl *ctl)
|
|
{
|
|
unsigned long flags;
|
|
int blocking;
|
|
int new_level;
|
|
int level;
|
|
int ret = 0;
|
|
int set_lvb = 0;
|
|
unsigned int gen;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
recheck:
|
|
/*
|
|
* Is it still blocking? If not, we have no more work to do.
|
|
*/
|
|
if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) {
|
|
BUG_ON(lockres->l_blocking != DLM_LOCK_NL);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ret = 0;
|
|
goto leave;
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
|
/* XXX
|
|
* This is a *big* race. The OCFS2_LOCK_PENDING flag
|
|
* exists entirely for one reason - another thread has set
|
|
* OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock().
|
|
*
|
|
* If we do ocfs2_cancel_convert() before the other thread
|
|
* calls dlm_lock(), our cancel will do nothing. We will
|
|
* get no ast, and we will have no way of knowing the
|
|
* cancel failed. Meanwhile, the other thread will call
|
|
* into dlm_lock() and wait...forever.
|
|
*
|
|
* Why forever? Because another node has asked for the
|
|
* lock first; that's why we're here in unblock_lock().
|
|
*
|
|
* The solution is OCFS2_LOCK_PENDING. When PENDING is
|
|
* set, we just requeue the unblock. Only when the other
|
|
* thread has called dlm_lock() and cleared PENDING will
|
|
* we then cancel their request.
|
|
*
|
|
* All callers of dlm_lock() must set OCFS2_DLM_PENDING
|
|
* at the same time they set OCFS2_DLM_BUSY. They must
|
|
* clear OCFS2_DLM_PENDING after dlm_lock() returns.
|
|
*/
|
|
if (lockres->l_flags & OCFS2_LOCK_PENDING) {
|
|
mlog(ML_BASTS, "lockres %s, ReQ: Pending\n",
|
|
lockres->l_name);
|
|
goto leave_requeue;
|
|
}
|
|
|
|
ctl->requeue = 1;
|
|
ret = ocfs2_prepare_cancel_convert(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
if (ret) {
|
|
ret = ocfs2_cancel_convert(osb, lockres);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
}
|
|
goto leave;
|
|
}
|
|
|
|
/*
|
|
* This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is
|
|
* set when the ast is received for an upconvert just before the
|
|
* OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast
|
|
* on the heels of the ast, we want to delay the downconvert just
|
|
* enough to allow the up requestor to do its task. Because this
|
|
* lock is in the blocked queue, the lock will be downconverted
|
|
* as soon as the requestor is done with the lock.
|
|
*/
|
|
if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING)
|
|
goto leave_requeue;
|
|
|
|
/*
|
|
* How can we block and yet be at NL? We were trying to upconvert
|
|
* from NL and got canceled. The code comes back here, and now
|
|
* we notice and clear BLOCKING.
|
|
*/
|
|
if (lockres->l_level == DLM_LOCK_NL) {
|
|
BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders);
|
|
mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name);
|
|
lockres->l_blocking = DLM_LOCK_NL;
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto leave;
|
|
}
|
|
|
|
/* if we're blocking an exclusive and we have *any* holders,
|
|
* then requeue. */
|
|
if ((lockres->l_blocking == DLM_LOCK_EX)
|
|
&& (lockres->l_ex_holders || lockres->l_ro_holders)) {
|
|
mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n",
|
|
lockres->l_name, lockres->l_ex_holders,
|
|
lockres->l_ro_holders);
|
|
goto leave_requeue;
|
|
}
|
|
|
|
/* If it's a PR we're blocking, then only
|
|
* requeue if we've got any EX holders */
|
|
if (lockres->l_blocking == DLM_LOCK_PR &&
|
|
lockres->l_ex_holders) {
|
|
mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n",
|
|
lockres->l_name, lockres->l_ex_holders);
|
|
goto leave_requeue;
|
|
}
|
|
|
|
/*
|
|
* Can we get a lock in this state if the holder counts are
|
|
* zero? The meta data unblock code used to check this.
|
|
*/
|
|
if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
|
|
&& (lockres->l_flags & OCFS2_LOCK_REFRESHING)) {
|
|
mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n",
|
|
lockres->l_name);
|
|
goto leave_requeue;
|
|
}
|
|
|
|
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
|
|
|
if (lockres->l_ops->check_downconvert
|
|
&& !lockres->l_ops->check_downconvert(lockres, new_level)) {
|
|
mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n",
|
|
lockres->l_name);
|
|
goto leave_requeue;
|
|
}
|
|
|
|
/* If we get here, then we know that there are no more
|
|
* incompatible holders (and anyone asking for an incompatible
|
|
* lock is blocked). We can now downconvert the lock */
|
|
if (!lockres->l_ops->downconvert_worker)
|
|
goto downconvert;
|
|
|
|
/* Some lockres types want to do a bit of work before
|
|
* downconverting a lock. Allow that here. The worker function
|
|
* may sleep, so we save off a copy of what we're blocking as
|
|
* it may change while we're not holding the spin lock. */
|
|
blocking = lockres->l_blocking;
|
|
level = lockres->l_level;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
|
|
|
|
if (ctl->unblock_action == UNBLOCK_STOP_POST) {
|
|
mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n",
|
|
lockres->l_name);
|
|
goto leave;
|
|
}
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) {
|
|
/* If this changed underneath us, then we can't drop
|
|
* it just yet. */
|
|
mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, "
|
|
"Recheck\n", lockres->l_name, blocking,
|
|
lockres->l_blocking, level, lockres->l_level);
|
|
goto recheck;
|
|
}
|
|
|
|
downconvert:
|
|
ctl->requeue = 0;
|
|
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
|
|
if (lockres->l_level == DLM_LOCK_EX)
|
|
set_lvb = 1;
|
|
|
|
/*
|
|
* We only set the lvb if the lock has been fully
|
|
* refreshed - otherwise we risk setting stale
|
|
* data. Otherwise, there's no need to actually clear
|
|
* out the lvb here as it's value is still valid.
|
|
*/
|
|
if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
|
|
lockres->l_ops->set_lvb(lockres);
|
|
}
|
|
|
|
gen = ocfs2_prepare_downconvert(lockres, new_level);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb,
|
|
gen);
|
|
|
|
leave:
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
return ret;
|
|
|
|
leave_requeue:
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ctl->requeue = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
|
|
int blocking)
|
|
{
|
|
struct inode *inode;
|
|
struct address_space *mapping;
|
|
struct ocfs2_inode_info *oi;
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
mapping = inode->i_mapping;
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
oi = OCFS2_I(inode);
|
|
oi->ip_dir_lock_gen++;
|
|
mlog(0, "generation: %u\n", oi->ip_dir_lock_gen);
|
|
goto out;
|
|
}
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
goto out;
|
|
|
|
/*
|
|
* We need this before the filemap_fdatawrite() so that it can
|
|
* transfer the dirty bit from the PTE to the
|
|
* page. Unfortunately this means that even for EX->PR
|
|
* downconverts, we'll lose our mappings and have to build
|
|
* them up again.
|
|
*/
|
|
unmap_mapping_range(mapping, 0, 0, 0);
|
|
|
|
if (filemap_fdatawrite(mapping)) {
|
|
mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
}
|
|
sync_mapping_buffers(mapping);
|
|
if (blocking == DLM_LOCK_EX) {
|
|
truncate_inode_pages(mapping, 0);
|
|
} else {
|
|
/* We only need to wait on the I/O if we're not also
|
|
* truncating pages because truncate_inode_pages waits
|
|
* for us above. We don't truncate pages if we're
|
|
* blocking anything < EXMODE because we want to keep
|
|
* them around in that case. */
|
|
filemap_fdatawait(mapping);
|
|
}
|
|
|
|
out:
|
|
return UNBLOCK_CONTINUE;
|
|
}
|
|
|
|
static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci,
|
|
struct ocfs2_lock_res *lockres,
|
|
int new_level)
|
|
{
|
|
int checkpointed = ocfs2_ci_fully_checkpointed(ci);
|
|
|
|
BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR);
|
|
BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed);
|
|
|
|
if (checkpointed)
|
|
return 1;
|
|
|
|
ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci)));
|
|
return 0;
|
|
}
|
|
|
|
static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
|
|
int new_level)
|
|
{
|
|
struct inode *inode = ocfs2_lock_res_inode(lockres);
|
|
|
|
return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level);
|
|
}
|
|
|
|
static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct inode *inode = ocfs2_lock_res_inode(lockres);
|
|
|
|
__ocfs2_stuff_meta_lvb(inode);
|
|
}
|
|
|
|
/*
|
|
* Does the final reference drop on our dentry lock. Right now this
|
|
* happens in the downconvert thread, but we could choose to simplify the
|
|
* dlmglue API and push these off to the ocfs2_wq in the future.
|
|
*/
|
|
static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
|
|
ocfs2_dentry_lock_put(osb, dl);
|
|
}
|
|
|
|
/*
|
|
* d_delete() matching dentries before the lock downconvert.
|
|
*
|
|
* At this point, any process waiting to destroy the
|
|
* dentry_lock due to last ref count is stopped by the
|
|
* OCFS2_LOCK_QUEUED flag.
|
|
*
|
|
* We have two potential problems
|
|
*
|
|
* 1) If we do the last reference drop on our dentry_lock (via dput)
|
|
* we'll wind up in ocfs2_release_dentry_lock(), waiting on
|
|
* the downconvert to finish. Instead we take an elevated
|
|
* reference and push the drop until after we've completed our
|
|
* unblock processing.
|
|
*
|
|
* 2) There might be another process with a final reference,
|
|
* waiting on us to finish processing. If this is the case, we
|
|
* detect it and exit out - there's no more dentries anyway.
|
|
*/
|
|
static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
|
|
int blocking)
|
|
{
|
|
struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
|
|
struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
|
|
struct dentry *dentry;
|
|
unsigned long flags;
|
|
int extra_ref = 0;
|
|
|
|
/*
|
|
* This node is blocking another node from getting a read
|
|
* lock. This happens when we've renamed within a
|
|
* directory. We've forced the other nodes to d_delete(), but
|
|
* we never actually dropped our lock because it's still
|
|
* valid. The downconvert code will retain a PR for this node,
|
|
* so there's no further work to do.
|
|
*/
|
|
if (blocking == DLM_LOCK_PR)
|
|
return UNBLOCK_CONTINUE;
|
|
|
|
/*
|
|
* Mark this inode as potentially orphaned. The code in
|
|
* ocfs2_delete_inode() will figure out whether it actually
|
|
* needs to be freed or not.
|
|
*/
|
|
spin_lock(&oi->ip_lock);
|
|
oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
/*
|
|
* Yuck. We need to make sure however that the check of
|
|
* OCFS2_LOCK_FREEING and the extra reference are atomic with
|
|
* respect to a reference decrement or the setting of that
|
|
* flag.
|
|
*/
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
spin_lock(&dentry_attach_lock);
|
|
if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
|
|
&& dl->dl_count) {
|
|
dl->dl_count++;
|
|
extra_ref = 1;
|
|
}
|
|
spin_unlock(&dentry_attach_lock);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
mlog(0, "extra_ref = %d\n", extra_ref);
|
|
|
|
/*
|
|
* We have a process waiting on us in ocfs2_dentry_iput(),
|
|
* which means we can't have any more outstanding
|
|
* aliases. There's no need to do any more work.
|
|
*/
|
|
if (!extra_ref)
|
|
return UNBLOCK_CONTINUE;
|
|
|
|
spin_lock(&dentry_attach_lock);
|
|
while (1) {
|
|
dentry = ocfs2_find_local_alias(dl->dl_inode,
|
|
dl->dl_parent_blkno, 1);
|
|
if (!dentry)
|
|
break;
|
|
spin_unlock(&dentry_attach_lock);
|
|
|
|
mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
|
|
dentry->d_name.name);
|
|
|
|
/*
|
|
* The following dcache calls may do an
|
|
* iput(). Normally we don't want that from the
|
|
* downconverting thread, but in this case it's ok
|
|
* because the requesting node already has an
|
|
* exclusive lock on the inode, so it can't be queued
|
|
* for a downconvert.
|
|
*/
|
|
d_delete(dentry);
|
|
dput(dentry);
|
|
|
|
spin_lock(&dentry_attach_lock);
|
|
}
|
|
spin_unlock(&dentry_attach_lock);
|
|
|
|
/*
|
|
* If we are the last holder of this dentry lock, there is no
|
|
* reason to downconvert so skip straight to the unlock.
|
|
*/
|
|
if (dl->dl_count == 1)
|
|
return UNBLOCK_STOP_POST;
|
|
|
|
return UNBLOCK_CONTINUE_POST;
|
|
}
|
|
|
|
static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
|
|
int new_level)
|
|
{
|
|
struct ocfs2_refcount_tree *tree =
|
|
ocfs2_lock_res_refcount_tree(lockres);
|
|
|
|
return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level);
|
|
}
|
|
|
|
static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
|
|
int blocking)
|
|
{
|
|
struct ocfs2_refcount_tree *tree =
|
|
ocfs2_lock_res_refcount_tree(lockres);
|
|
|
|
ocfs2_metadata_cache_purge(&tree->rf_ci);
|
|
|
|
return UNBLOCK_CONTINUE;
|
|
}
|
|
|
|
static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_qinfo_lvb *lvb;
|
|
struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres);
|
|
struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb,
|
|
oinfo->dqi_gi.dqi_type);
|
|
|
|
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
lvb->lvb_version = OCFS2_QINFO_LVB_VERSION;
|
|
lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace);
|
|
lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace);
|
|
lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms);
|
|
lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks);
|
|
lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk);
|
|
lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry);
|
|
}
|
|
|
|
void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex)
|
|
{
|
|
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
|
|
struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb);
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
|
|
if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(osb, lockres, level);
|
|
}
|
|
|
|
static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo)
|
|
{
|
|
struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb,
|
|
oinfo->dqi_gi.dqi_type);
|
|
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
|
|
struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
|
|
struct buffer_head *bh = NULL;
|
|
struct ocfs2_global_disk_dqinfo *gdinfo;
|
|
int status = 0;
|
|
|
|
if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
|
|
lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) {
|
|
info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace);
|
|
info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace);
|
|
oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms);
|
|
oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks);
|
|
oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk);
|
|
oinfo->dqi_gi.dqi_free_entry =
|
|
be32_to_cpu(lvb->lvb_free_entry);
|
|
} else {
|
|
status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode,
|
|
oinfo->dqi_giblk, &bh);
|
|
if (status) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
gdinfo = (struct ocfs2_global_disk_dqinfo *)
|
|
(bh->b_data + OCFS2_GLOBAL_INFO_OFF);
|
|
info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace);
|
|
info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace);
|
|
oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms);
|
|
oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks);
|
|
oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk);
|
|
oinfo->dqi_gi.dqi_free_entry =
|
|
le32_to_cpu(gdinfo->dqi_free_entry);
|
|
brelse(bh);
|
|
ocfs2_track_lock_refresh(lockres);
|
|
}
|
|
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
/* Lock quota info, this function expects at least shared lock on the quota file
|
|
* so that we can safely refresh quota info from disk. */
|
|
int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex)
|
|
{
|
|
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
|
|
struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb);
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
int status = 0;
|
|
|
|
/* On RO devices, locking really isn't needed... */
|
|
if (ocfs2_is_hard_readonly(osb)) {
|
|
if (ex)
|
|
status = -EROFS;
|
|
goto bail;
|
|
}
|
|
if (ocfs2_mount_local(osb))
|
|
goto bail;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
if (!ocfs2_should_refresh_lock_res(lockres))
|
|
goto bail;
|
|
/* OK, we have the lock but we need to refresh the quota info */
|
|
status = ocfs2_refresh_qinfo(oinfo);
|
|
if (status)
|
|
ocfs2_qinfo_unlock(oinfo, ex);
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex)
|
|
{
|
|
int status;
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
|
|
struct ocfs2_super *osb = lockres->l_priv;
|
|
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
if (ocfs2_mount_local(osb))
|
|
return 0;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex)
|
|
{
|
|
int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
|
|
struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
|
|
struct ocfs2_super *osb = lockres->l_priv;
|
|
|
|
if (!ocfs2_mount_local(osb))
|
|
ocfs2_cluster_unlock(osb, lockres, level);
|
|
}
|
|
|
|
static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int status;
|
|
struct ocfs2_unblock_ctl ctl = {0, 0,};
|
|
unsigned long flags;
|
|
|
|
/* Our reference to the lockres in this function can be
|
|
* considered valid until we remove the OCFS2_LOCK_QUEUED
|
|
* flag. */
|
|
|
|
BUG_ON(!lockres);
|
|
BUG_ON(!lockres->l_ops);
|
|
|
|
mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name);
|
|
|
|
/* Detect whether a lock has been marked as going away while
|
|
* the downconvert thread was processing other things. A lock can
|
|
* still be marked with OCFS2_LOCK_FREEING after this check,
|
|
* but short circuiting here will still save us some
|
|
* performance. */
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING)
|
|
goto unqueue;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
status = ocfs2_unblock_lock(osb, lockres, &ctl);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
unqueue:
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
|
|
} else
|
|
ocfs2_schedule_blocked_lock(osb, lockres);
|
|
|
|
mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name,
|
|
ctl.requeue ? "yes" : "no");
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
if (ctl.unblock_action != UNBLOCK_CONTINUE
|
|
&& lockres->l_ops->post_unlock)
|
|
lockres->l_ops->post_unlock(osb, lockres);
|
|
}
|
|
|
|
static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING) {
|
|
/* Do not schedule a lock for downconvert when it's on
|
|
* the way to destruction - any nodes wanting access
|
|
* to the resource will get it soon. */
|
|
mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n",
|
|
lockres->l_name, lockres->l_flags);
|
|
return;
|
|
}
|
|
|
|
lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
|
|
|
|
spin_lock(&osb->dc_task_lock);
|
|
if (list_empty(&lockres->l_blocked_list)) {
|
|
list_add_tail(&lockres->l_blocked_list,
|
|
&osb->blocked_lock_list);
|
|
osb->blocked_lock_count++;
|
|
}
|
|
spin_unlock(&osb->dc_task_lock);
|
|
}
|
|
|
|
static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb)
|
|
{
|
|
unsigned long processed;
|
|
struct ocfs2_lock_res *lockres;
|
|
|
|
spin_lock(&osb->dc_task_lock);
|
|
/* grab this early so we know to try again if a state change and
|
|
* wake happens part-way through our work */
|
|
osb->dc_work_sequence = osb->dc_wake_sequence;
|
|
|
|
processed = osb->blocked_lock_count;
|
|
while (processed) {
|
|
BUG_ON(list_empty(&osb->blocked_lock_list));
|
|
|
|
lockres = list_entry(osb->blocked_lock_list.next,
|
|
struct ocfs2_lock_res, l_blocked_list);
|
|
list_del_init(&lockres->l_blocked_list);
|
|
osb->blocked_lock_count--;
|
|
spin_unlock(&osb->dc_task_lock);
|
|
|
|
BUG_ON(!processed);
|
|
processed--;
|
|
|
|
ocfs2_process_blocked_lock(osb, lockres);
|
|
|
|
spin_lock(&osb->dc_task_lock);
|
|
}
|
|
spin_unlock(&osb->dc_task_lock);
|
|
}
|
|
|
|
static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb)
|
|
{
|
|
int empty = 0;
|
|
|
|
spin_lock(&osb->dc_task_lock);
|
|
if (list_empty(&osb->blocked_lock_list))
|
|
empty = 1;
|
|
|
|
spin_unlock(&osb->dc_task_lock);
|
|
return empty;
|
|
}
|
|
|
|
static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb)
|
|
{
|
|
int should_wake = 0;
|
|
|
|
spin_lock(&osb->dc_task_lock);
|
|
if (osb->dc_work_sequence != osb->dc_wake_sequence)
|
|
should_wake = 1;
|
|
spin_unlock(&osb->dc_task_lock);
|
|
|
|
return should_wake;
|
|
}
|
|
|
|
static int ocfs2_downconvert_thread(void *arg)
|
|
{
|
|
int status = 0;
|
|
struct ocfs2_super *osb = arg;
|
|
|
|
/* only quit once we've been asked to stop and there is no more
|
|
* work available */
|
|
while (!(kthread_should_stop() &&
|
|
ocfs2_downconvert_thread_lists_empty(osb))) {
|
|
|
|
wait_event_interruptible(osb->dc_event,
|
|
ocfs2_downconvert_thread_should_wake(osb) ||
|
|
kthread_should_stop());
|
|
|
|
mlog(0, "downconvert_thread: awoken\n");
|
|
|
|
ocfs2_downconvert_thread_do_work(osb);
|
|
}
|
|
|
|
osb->dc_task = NULL;
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb)
|
|
{
|
|
spin_lock(&osb->dc_task_lock);
|
|
/* make sure the voting thread gets a swipe at whatever changes
|
|
* the caller may have made to the voting state */
|
|
osb->dc_wake_sequence++;
|
|
spin_unlock(&osb->dc_task_lock);
|
|
wake_up(&osb->dc_event);
|
|
}
|