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marcus.erl |
/* -*- 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/crc32.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 <cluster/heartbeat.h>
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#include <cluster/nodemanager.h>
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#include <cluster/tcp.h>
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#include <dlm/dlmapi.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 "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 "slot_map.h"
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#include "super.h"
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#include "uptodate.h"
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#include "vote.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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};
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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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/*
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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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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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#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 = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
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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 (or "vote") thread
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* after a successful downconvert. The lockres will not be
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* referenced after this callback is called, so it is safe to
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* free 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_meta_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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.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
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};
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static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
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.get_osb = ocfs2_get_inode_osb,
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.downconvert_worker = ocfs2_data_convert_worker,
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.flags = 0,
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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_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 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_DATA ||
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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 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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275 |
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276 |
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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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280 |
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return (struct ocfs2_dentry_lock *)lockres->l_priv;
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}
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283 |
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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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288 |
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return (struct ocfs2_super *)lockres->l_priv;
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}
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290 |
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291 |
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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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int dlm_flags);
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295 |
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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);
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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, _stat, _lockres) do { \
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mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
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"resource %s: %s\n", dlm_errname(_stat), _func, \
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_lockres->l_name, dlm_errmsg(_stat)); \
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} while (0)
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static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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315 |
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static int ocfs2_meta_lock_update(struct inode *inode,
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struct buffer_head **bh);
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317 |
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static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
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318 |
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static inline int ocfs2_highest_compat_lock_level(int level);
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319 |
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320 |
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static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
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321 |
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u64 blkno,
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322 |
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u32 generation,
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323 |
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|
char *name)
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324 |
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{
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325 |
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int len;
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326 |
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327 |
|
|
mlog_entry_void();
|
328 |
|
|
|
329 |
|
|
BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
|
330 |
|
|
|
331 |
|
|
len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
|
332 |
|
|
ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
|
333 |
|
|
(long long)blkno, generation);
|
334 |
|
|
|
335 |
|
|
BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
|
336 |
|
|
|
337 |
|
|
mlog(0, "built lock resource with name: %s\n", name);
|
338 |
|
|
|
339 |
|
|
mlog_exit_void();
|
340 |
|
|
}
|
341 |
|
|
|
342 |
|
|
static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
|
343 |
|
|
|
344 |
|
|
static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
|
345 |
|
|
struct ocfs2_dlm_debug *dlm_debug)
|
346 |
|
|
{
|
347 |
|
|
mlog(0, "Add tracking for lockres %s\n", res->l_name);
|
348 |
|
|
|
349 |
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
350 |
|
|
list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
|
351 |
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
352 |
|
|
}
|
353 |
|
|
|
354 |
|
|
static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
|
355 |
|
|
{
|
356 |
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
357 |
|
|
if (!list_empty(&res->l_debug_list))
|
358 |
|
|
list_del_init(&res->l_debug_list);
|
359 |
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
360 |
|
|
}
|
361 |
|
|
|
362 |
|
|
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
|
363 |
|
|
struct ocfs2_lock_res *res,
|
364 |
|
|
enum ocfs2_lock_type type,
|
365 |
|
|
struct ocfs2_lock_res_ops *ops,
|
366 |
|
|
void *priv)
|
367 |
|
|
{
|
368 |
|
|
res->l_type = type;
|
369 |
|
|
res->l_ops = ops;
|
370 |
|
|
res->l_priv = priv;
|
371 |
|
|
|
372 |
|
|
res->l_level = LKM_IVMODE;
|
373 |
|
|
res->l_requested = LKM_IVMODE;
|
374 |
|
|
res->l_blocking = LKM_IVMODE;
|
375 |
|
|
res->l_action = OCFS2_AST_INVALID;
|
376 |
|
|
res->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
377 |
|
|
|
378 |
|
|
res->l_flags = OCFS2_LOCK_INITIALIZED;
|
379 |
|
|
|
380 |
|
|
ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
|
381 |
|
|
}
|
382 |
|
|
|
383 |
|
|
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
|
384 |
|
|
{
|
385 |
|
|
/* This also clears out the lock status block */
|
386 |
|
|
memset(res, 0, sizeof(struct ocfs2_lock_res));
|
387 |
|
|
spin_lock_init(&res->l_lock);
|
388 |
|
|
init_waitqueue_head(&res->l_event);
|
389 |
|
|
INIT_LIST_HEAD(&res->l_blocked_list);
|
390 |
|
|
INIT_LIST_HEAD(&res->l_mask_waiters);
|
391 |
|
|
}
|
392 |
|
|
|
393 |
|
|
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
|
394 |
|
|
enum ocfs2_lock_type type,
|
395 |
|
|
unsigned int generation,
|
396 |
|
|
struct inode *inode)
|
397 |
|
|
{
|
398 |
|
|
struct ocfs2_lock_res_ops *ops;
|
399 |
|
|
|
400 |
|
|
switch(type) {
|
401 |
|
|
case OCFS2_LOCK_TYPE_RW:
|
402 |
|
|
ops = &ocfs2_inode_rw_lops;
|
403 |
|
|
break;
|
404 |
|
|
case OCFS2_LOCK_TYPE_META:
|
405 |
|
|
ops = &ocfs2_inode_meta_lops;
|
406 |
|
|
break;
|
407 |
|
|
case OCFS2_LOCK_TYPE_DATA:
|
408 |
|
|
ops = &ocfs2_inode_data_lops;
|
409 |
|
|
break;
|
410 |
|
|
case OCFS2_LOCK_TYPE_OPEN:
|
411 |
|
|
ops = &ocfs2_inode_open_lops;
|
412 |
|
|
break;
|
413 |
|
|
default:
|
414 |
|
|
mlog_bug_on_msg(1, "type: %d\n", type);
|
415 |
|
|
ops = NULL; /* thanks, gcc */
|
416 |
|
|
break;
|
417 |
|
|
};
|
418 |
|
|
|
419 |
|
|
ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
|
420 |
|
|
generation, res->l_name);
|
421 |
|
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
|
422 |
|
|
}
|
423 |
|
|
|
424 |
|
|
static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
|
425 |
|
|
{
|
426 |
|
|
struct inode *inode = ocfs2_lock_res_inode(lockres);
|
427 |
|
|
|
428 |
|
|
return OCFS2_SB(inode->i_sb);
|
429 |
|
|
}
|
430 |
|
|
|
431 |
|
|
static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
|
432 |
|
|
{
|
433 |
|
|
__be64 inode_blkno_be;
|
434 |
|
|
|
435 |
|
|
memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
|
436 |
|
|
sizeof(__be64));
|
437 |
|
|
|
438 |
|
|
return be64_to_cpu(inode_blkno_be);
|
439 |
|
|
}
|
440 |
|
|
|
441 |
|
|
static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
|
442 |
|
|
{
|
443 |
|
|
struct ocfs2_dentry_lock *dl = lockres->l_priv;
|
444 |
|
|
|
445 |
|
|
return OCFS2_SB(dl->dl_inode->i_sb);
|
446 |
|
|
}
|
447 |
|
|
|
448 |
|
|
void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
|
449 |
|
|
u64 parent, struct inode *inode)
|
450 |
|
|
{
|
451 |
|
|
int len;
|
452 |
|
|
u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
|
453 |
|
|
__be64 inode_blkno_be = cpu_to_be64(inode_blkno);
|
454 |
|
|
struct ocfs2_lock_res *lockres = &dl->dl_lockres;
|
455 |
|
|
|
456 |
|
|
ocfs2_lock_res_init_once(lockres);
|
457 |
|
|
|
458 |
|
|
/*
|
459 |
|
|
* Unfortunately, the standard lock naming scheme won't work
|
460 |
|
|
* here because we have two 16 byte values to use. Instead,
|
461 |
|
|
* we'll stuff the inode number as a binary value. We still
|
462 |
|
|
* want error prints to show something without garbling the
|
463 |
|
|
* display, so drop a null byte in there before the inode
|
464 |
|
|
* number. A future version of OCFS2 will likely use all
|
465 |
|
|
* binary lock names. The stringified names have been a
|
466 |
|
|
* tremendous aid in debugging, but now that the debugfs
|
467 |
|
|
* interface exists, we can mangle things there if need be.
|
468 |
|
|
*
|
469 |
|
|
* NOTE: We also drop the standard "pad" value (the total lock
|
470 |
|
|
* name size stays the same though - the last part is all
|
471 |
|
|
* zeros due to the memset in ocfs2_lock_res_init_once()
|
472 |
|
|
*/
|
473 |
|
|
len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
|
474 |
|
|
"%c%016llx",
|
475 |
|
|
ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
|
476 |
|
|
(long long)parent);
|
477 |
|
|
|
478 |
|
|
BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
|
479 |
|
|
|
480 |
|
|
memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
|
481 |
|
|
sizeof(__be64));
|
482 |
|
|
|
483 |
|
|
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
|
484 |
|
|
OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
|
485 |
|
|
dl);
|
486 |
|
|
}
|
487 |
|
|
|
488 |
|
|
static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
|
489 |
|
|
struct ocfs2_super *osb)
|
490 |
|
|
{
|
491 |
|
|
/* Superblock lockres doesn't come from a slab so we call init
|
492 |
|
|
* once on it manually. */
|
493 |
|
|
ocfs2_lock_res_init_once(res);
|
494 |
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
|
495 |
|
|
0, res->l_name);
|
496 |
|
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
|
497 |
|
|
&ocfs2_super_lops, osb);
|
498 |
|
|
}
|
499 |
|
|
|
500 |
|
|
static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
|
501 |
|
|
struct ocfs2_super *osb)
|
502 |
|
|
{
|
503 |
|
|
/* Rename lockres doesn't come from a slab so we call init
|
504 |
|
|
* once on it manually. */
|
505 |
|
|
ocfs2_lock_res_init_once(res);
|
506 |
|
|
ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
|
507 |
|
|
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
|
508 |
|
|
&ocfs2_rename_lops, osb);
|
509 |
|
|
}
|
510 |
|
|
|
511 |
|
|
void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
|
512 |
|
|
{
|
513 |
|
|
mlog_entry_void();
|
514 |
|
|
|
515 |
|
|
if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
|
516 |
|
|
return;
|
517 |
|
|
|
518 |
|
|
ocfs2_remove_lockres_tracking(res);
|
519 |
|
|
|
520 |
|
|
mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
|
521 |
|
|
"Lockres %s is on the blocked list\n",
|
522 |
|
|
res->l_name);
|
523 |
|
|
mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
|
524 |
|
|
"Lockres %s has mask waiters pending\n",
|
525 |
|
|
res->l_name);
|
526 |
|
|
mlog_bug_on_msg(spin_is_locked(&res->l_lock),
|
527 |
|
|
"Lockres %s is locked\n",
|
528 |
|
|
res->l_name);
|
529 |
|
|
mlog_bug_on_msg(res->l_ro_holders,
|
530 |
|
|
"Lockres %s has %u ro holders\n",
|
531 |
|
|
res->l_name, res->l_ro_holders);
|
532 |
|
|
mlog_bug_on_msg(res->l_ex_holders,
|
533 |
|
|
"Lockres %s has %u ex holders\n",
|
534 |
|
|
res->l_name, res->l_ex_holders);
|
535 |
|
|
|
536 |
|
|
/* Need to clear out the lock status block for the dlm */
|
537 |
|
|
memset(&res->l_lksb, 0, sizeof(res->l_lksb));
|
538 |
|
|
|
539 |
|
|
res->l_flags = 0UL;
|
540 |
|
|
mlog_exit_void();
|
541 |
|
|
}
|
542 |
|
|
|
543 |
|
|
static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
|
544 |
|
|
int level)
|
545 |
|
|
{
|
546 |
|
|
mlog_entry_void();
|
547 |
|
|
|
548 |
|
|
BUG_ON(!lockres);
|
549 |
|
|
|
550 |
|
|
switch(level) {
|
551 |
|
|
case LKM_EXMODE:
|
552 |
|
|
lockres->l_ex_holders++;
|
553 |
|
|
break;
|
554 |
|
|
case LKM_PRMODE:
|
555 |
|
|
lockres->l_ro_holders++;
|
556 |
|
|
break;
|
557 |
|
|
default:
|
558 |
|
|
BUG();
|
559 |
|
|
}
|
560 |
|
|
|
561 |
|
|
mlog_exit_void();
|
562 |
|
|
}
|
563 |
|
|
|
564 |
|
|
static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
|
565 |
|
|
int level)
|
566 |
|
|
{
|
567 |
|
|
mlog_entry_void();
|
568 |
|
|
|
569 |
|
|
BUG_ON(!lockres);
|
570 |
|
|
|
571 |
|
|
switch(level) {
|
572 |
|
|
case LKM_EXMODE:
|
573 |
|
|
BUG_ON(!lockres->l_ex_holders);
|
574 |
|
|
lockres->l_ex_holders--;
|
575 |
|
|
break;
|
576 |
|
|
case LKM_PRMODE:
|
577 |
|
|
BUG_ON(!lockres->l_ro_holders);
|
578 |
|
|
lockres->l_ro_holders--;
|
579 |
|
|
break;
|
580 |
|
|
default:
|
581 |
|
|
BUG();
|
582 |
|
|
}
|
583 |
|
|
mlog_exit_void();
|
584 |
|
|
}
|
585 |
|
|
|
586 |
|
|
/* WARNING: This function lives in a world where the only three lock
|
587 |
|
|
* levels are EX, PR, and NL. It *will* have to be adjusted when more
|
588 |
|
|
* lock types are added. */
|
589 |
|
|
static inline int ocfs2_highest_compat_lock_level(int level)
|
590 |
|
|
{
|
591 |
|
|
int new_level = LKM_EXMODE;
|
592 |
|
|
|
593 |
|
|
if (level == LKM_EXMODE)
|
594 |
|
|
new_level = LKM_NLMODE;
|
595 |
|
|
else if (level == LKM_PRMODE)
|
596 |
|
|
new_level = LKM_PRMODE;
|
597 |
|
|
return new_level;
|
598 |
|
|
}
|
599 |
|
|
|
600 |
|
|
static void lockres_set_flags(struct ocfs2_lock_res *lockres,
|
601 |
|
|
unsigned long newflags)
|
602 |
|
|
{
|
603 |
|
|
struct ocfs2_mask_waiter *mw, *tmp;
|
604 |
|
|
|
605 |
|
|
assert_spin_locked(&lockres->l_lock);
|
606 |
|
|
|
607 |
|
|
lockres->l_flags = newflags;
|
608 |
|
|
|
609 |
|
|
list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) {
|
610 |
|
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
|
611 |
|
|
continue;
|
612 |
|
|
|
613 |
|
|
list_del_init(&mw->mw_item);
|
614 |
|
|
mw->mw_status = 0;
|
615 |
|
|
complete(&mw->mw_complete);
|
616 |
|
|
}
|
617 |
|
|
}
|
618 |
|
|
static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
|
619 |
|
|
{
|
620 |
|
|
lockres_set_flags(lockres, lockres->l_flags | or);
|
621 |
|
|
}
|
622 |
|
|
static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
|
623 |
|
|
unsigned long clear)
|
624 |
|
|
{
|
625 |
|
|
lockres_set_flags(lockres, lockres->l_flags & ~clear);
|
626 |
|
|
}
|
627 |
|
|
|
628 |
|
|
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
|
629 |
|
|
{
|
630 |
|
|
mlog_entry_void();
|
631 |
|
|
|
632 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
633 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
|
634 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
635 |
|
|
BUG_ON(lockres->l_blocking <= LKM_NLMODE);
|
636 |
|
|
|
637 |
|
|
lockres->l_level = lockres->l_requested;
|
638 |
|
|
if (lockres->l_level <=
|
639 |
|
|
ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
|
640 |
|
|
lockres->l_blocking = LKM_NLMODE;
|
641 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
|
642 |
|
|
}
|
643 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
644 |
|
|
|
645 |
|
|
mlog_exit_void();
|
646 |
|
|
}
|
647 |
|
|
|
648 |
|
|
static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
|
649 |
|
|
{
|
650 |
|
|
mlog_entry_void();
|
651 |
|
|
|
652 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
653 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
|
654 |
|
|
|
655 |
|
|
/* Convert from RO to EX doesn't really need anything as our
|
656 |
|
|
* information is already up to data. Convert from NL to
|
657 |
|
|
* *anything* however should mark ourselves as needing an
|
658 |
|
|
* update */
|
659 |
|
|
if (lockres->l_level == LKM_NLMODE &&
|
660 |
|
|
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
|
661 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
662 |
|
|
|
663 |
|
|
lockres->l_level = lockres->l_requested;
|
664 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
665 |
|
|
|
666 |
|
|
mlog_exit_void();
|
667 |
|
|
}
|
668 |
|
|
|
669 |
|
|
static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
|
670 |
|
|
{
|
671 |
|
|
mlog_entry_void();
|
672 |
|
|
|
673 |
|
|
BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY)));
|
674 |
|
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
|
675 |
|
|
|
676 |
|
|
if (lockres->l_requested > LKM_NLMODE &&
|
677 |
|
|
!(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
|
678 |
|
|
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
|
679 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
680 |
|
|
|
681 |
|
|
lockres->l_level = lockres->l_requested;
|
682 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
|
683 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
684 |
|
|
|
685 |
|
|
mlog_exit_void();
|
686 |
|
|
}
|
687 |
|
|
|
688 |
|
|
static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
|
689 |
|
|
int level)
|
690 |
|
|
{
|
691 |
|
|
int needs_downconvert = 0;
|
692 |
|
|
mlog_entry_void();
|
693 |
|
|
|
694 |
|
|
assert_spin_locked(&lockres->l_lock);
|
695 |
|
|
|
696 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
|
697 |
|
|
|
698 |
|
|
if (level > lockres->l_blocking) {
|
699 |
|
|
/* only schedule a downconvert if we haven't already scheduled
|
700 |
|
|
* one that goes low enough to satisfy the level we're
|
701 |
|
|
* blocking. this also catches the case where we get
|
702 |
|
|
* duplicate BASTs */
|
703 |
|
|
if (ocfs2_highest_compat_lock_level(level) <
|
704 |
|
|
ocfs2_highest_compat_lock_level(lockres->l_blocking))
|
705 |
|
|
needs_downconvert = 1;
|
706 |
|
|
|
707 |
|
|
lockres->l_blocking = level;
|
708 |
|
|
}
|
709 |
|
|
|
710 |
|
|
mlog_exit(needs_downconvert);
|
711 |
|
|
return needs_downconvert;
|
712 |
|
|
}
|
713 |
|
|
|
714 |
|
|
static void ocfs2_blocking_ast(void *opaque, int level)
|
715 |
|
|
{
|
716 |
|
|
struct ocfs2_lock_res *lockres = opaque;
|
717 |
|
|
struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
|
718 |
|
|
int needs_downconvert;
|
719 |
|
|
unsigned long flags;
|
720 |
|
|
|
721 |
|
|
BUG_ON(level <= LKM_NLMODE);
|
722 |
|
|
|
723 |
|
|
mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
|
724 |
|
|
lockres->l_name, level, lockres->l_level,
|
725 |
|
|
ocfs2_lock_type_string(lockres->l_type));
|
726 |
|
|
|
727 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
728 |
|
|
needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
|
729 |
|
|
if (needs_downconvert)
|
730 |
|
|
ocfs2_schedule_blocked_lock(osb, lockres);
|
731 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
732 |
|
|
|
733 |
|
|
wake_up(&lockres->l_event);
|
734 |
|
|
|
735 |
|
|
ocfs2_kick_vote_thread(osb);
|
736 |
|
|
}
|
737 |
|
|
|
738 |
|
|
static void ocfs2_locking_ast(void *opaque)
|
739 |
|
|
{
|
740 |
|
|
struct ocfs2_lock_res *lockres = opaque;
|
741 |
|
|
struct dlm_lockstatus *lksb = &lockres->l_lksb;
|
742 |
|
|
unsigned long flags;
|
743 |
|
|
|
744 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
745 |
|
|
|
746 |
|
|
if (lksb->status != DLM_NORMAL) {
|
747 |
|
|
mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
|
748 |
|
|
lockres->l_name, lksb->status);
|
749 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
750 |
|
|
return;
|
751 |
|
|
}
|
752 |
|
|
|
753 |
|
|
switch(lockres->l_action) {
|
754 |
|
|
case OCFS2_AST_ATTACH:
|
755 |
|
|
ocfs2_generic_handle_attach_action(lockres);
|
756 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
|
757 |
|
|
break;
|
758 |
|
|
case OCFS2_AST_CONVERT:
|
759 |
|
|
ocfs2_generic_handle_convert_action(lockres);
|
760 |
|
|
break;
|
761 |
|
|
case OCFS2_AST_DOWNCONVERT:
|
762 |
|
|
ocfs2_generic_handle_downconvert_action(lockres);
|
763 |
|
|
break;
|
764 |
|
|
default:
|
765 |
|
|
mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
|
766 |
|
|
"lockres flags = 0x%lx, unlock action: %u\n",
|
767 |
|
|
lockres->l_name, lockres->l_action, lockres->l_flags,
|
768 |
|
|
lockres->l_unlock_action);
|
769 |
|
|
BUG();
|
770 |
|
|
}
|
771 |
|
|
|
772 |
|
|
/* set it to something invalid so if we get called again we
|
773 |
|
|
* can catch it. */
|
774 |
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
775 |
|
|
|
776 |
|
|
wake_up(&lockres->l_event);
|
777 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
778 |
|
|
}
|
779 |
|
|
|
780 |
|
|
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
|
781 |
|
|
int convert)
|
782 |
|
|
{
|
783 |
|
|
unsigned long flags;
|
784 |
|
|
|
785 |
|
|
mlog_entry_void();
|
786 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
787 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
788 |
|
|
if (convert)
|
789 |
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
790 |
|
|
else
|
791 |
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
792 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
793 |
|
|
|
794 |
|
|
wake_up(&lockres->l_event);
|
795 |
|
|
mlog_exit_void();
|
796 |
|
|
}
|
797 |
|
|
|
798 |
|
|
/* Note: If we detect another process working on the lock (i.e.,
|
799 |
|
|
* OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
|
800 |
|
|
* to do the right thing in that case.
|
801 |
|
|
*/
|
802 |
|
|
static int ocfs2_lock_create(struct ocfs2_super *osb,
|
803 |
|
|
struct ocfs2_lock_res *lockres,
|
804 |
|
|
int level,
|
805 |
|
|
int dlm_flags)
|
806 |
|
|
{
|
807 |
|
|
int ret = 0;
|
808 |
|
|
enum dlm_status status = DLM_NORMAL;
|
809 |
|
|
unsigned long flags;
|
810 |
|
|
|
811 |
|
|
mlog_entry_void();
|
812 |
|
|
|
813 |
|
|
mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level,
|
814 |
|
|
dlm_flags);
|
815 |
|
|
|
816 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
817 |
|
|
if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
|
818 |
|
|
(lockres->l_flags & OCFS2_LOCK_BUSY)) {
|
819 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
820 |
|
|
goto bail;
|
821 |
|
|
}
|
822 |
|
|
|
823 |
|
|
lockres->l_action = OCFS2_AST_ATTACH;
|
824 |
|
|
lockres->l_requested = level;
|
825 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
826 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
827 |
|
|
|
828 |
|
|
status = dlmlock(osb->dlm,
|
829 |
|
|
level,
|
830 |
|
|
&lockres->l_lksb,
|
831 |
|
|
dlm_flags,
|
832 |
|
|
lockres->l_name,
|
833 |
|
|
OCFS2_LOCK_ID_MAX_LEN - 1,
|
834 |
|
|
ocfs2_locking_ast,
|
835 |
|
|
lockres,
|
836 |
|
|
ocfs2_blocking_ast);
|
837 |
|
|
if (status != DLM_NORMAL) {
|
838 |
|
|
ocfs2_log_dlm_error("dlmlock", status, lockres);
|
839 |
|
|
ret = -EINVAL;
|
840 |
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
841 |
|
|
}
|
842 |
|
|
|
843 |
|
|
mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
|
844 |
|
|
|
845 |
|
|
bail:
|
846 |
|
|
mlog_exit(ret);
|
847 |
|
|
return ret;
|
848 |
|
|
}
|
849 |
|
|
|
850 |
|
|
static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
|
851 |
|
|
int flag)
|
852 |
|
|
{
|
853 |
|
|
unsigned long flags;
|
854 |
|
|
int ret;
|
855 |
|
|
|
856 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
857 |
|
|
ret = lockres->l_flags & flag;
|
858 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
859 |
|
|
|
860 |
|
|
return ret;
|
861 |
|
|
}
|
862 |
|
|
|
863 |
|
|
static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
|
864 |
|
|
|
865 |
|
|
{
|
866 |
|
|
wait_event(lockres->l_event,
|
867 |
|
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
|
868 |
|
|
}
|
869 |
|
|
|
870 |
|
|
static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
|
871 |
|
|
|
872 |
|
|
{
|
873 |
|
|
wait_event(lockres->l_event,
|
874 |
|
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
|
875 |
|
|
}
|
876 |
|
|
|
877 |
|
|
/* predict what lock level we'll be dropping down to on behalf
|
878 |
|
|
* of another node, and return true if the currently wanted
|
879 |
|
|
* level will be compatible with it. */
|
880 |
|
|
static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
|
881 |
|
|
int wanted)
|
882 |
|
|
{
|
883 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
884 |
|
|
|
885 |
|
|
return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
886 |
|
|
}
|
887 |
|
|
|
888 |
|
|
static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
|
889 |
|
|
{
|
890 |
|
|
INIT_LIST_HEAD(&mw->mw_item);
|
891 |
|
|
init_completion(&mw->mw_complete);
|
892 |
|
|
}
|
893 |
|
|
|
894 |
|
|
static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
|
895 |
|
|
{
|
896 |
|
|
wait_for_completion(&mw->mw_complete);
|
897 |
|
|
/* Re-arm the completion in case we want to wait on it again */
|
898 |
|
|
INIT_COMPLETION(mw->mw_complete);
|
899 |
|
|
return mw->mw_status;
|
900 |
|
|
}
|
901 |
|
|
|
902 |
|
|
static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
|
903 |
|
|
struct ocfs2_mask_waiter *mw,
|
904 |
|
|
unsigned long mask,
|
905 |
|
|
unsigned long goal)
|
906 |
|
|
{
|
907 |
|
|
BUG_ON(!list_empty(&mw->mw_item));
|
908 |
|
|
|
909 |
|
|
assert_spin_locked(&lockres->l_lock);
|
910 |
|
|
|
911 |
|
|
list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
|
912 |
|
|
mw->mw_mask = mask;
|
913 |
|
|
mw->mw_goal = goal;
|
914 |
|
|
}
|
915 |
|
|
|
916 |
|
|
/* returns 0 if the mw that was removed was already satisfied, -EBUSY
|
917 |
|
|
* if the mask still hadn't reached its goal */
|
918 |
|
|
static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
|
919 |
|
|
struct ocfs2_mask_waiter *mw)
|
920 |
|
|
{
|
921 |
|
|
unsigned long flags;
|
922 |
|
|
int ret = 0;
|
923 |
|
|
|
924 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
925 |
|
|
if (!list_empty(&mw->mw_item)) {
|
926 |
|
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
|
927 |
|
|
ret = -EBUSY;
|
928 |
|
|
|
929 |
|
|
list_del_init(&mw->mw_item);
|
930 |
|
|
init_completion(&mw->mw_complete);
|
931 |
|
|
}
|
932 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
933 |
|
|
|
934 |
|
|
return ret;
|
935 |
|
|
|
936 |
|
|
}
|
937 |
|
|
|
938 |
|
|
static int ocfs2_cluster_lock(struct ocfs2_super *osb,
|
939 |
|
|
struct ocfs2_lock_res *lockres,
|
940 |
|
|
int level,
|
941 |
|
|
int lkm_flags,
|
942 |
|
|
int arg_flags)
|
943 |
|
|
{
|
944 |
|
|
struct ocfs2_mask_waiter mw;
|
945 |
|
|
enum dlm_status status;
|
946 |
|
|
int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
|
947 |
|
|
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
|
948 |
|
|
unsigned long flags;
|
949 |
|
|
|
950 |
|
|
mlog_entry_void();
|
951 |
|
|
|
952 |
|
|
ocfs2_init_mask_waiter(&mw);
|
953 |
|
|
|
954 |
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
|
955 |
|
|
lkm_flags |= LKM_VALBLK;
|
956 |
|
|
|
957 |
|
|
again:
|
958 |
|
|
wait = 0;
|
959 |
|
|
|
960 |
|
|
if (catch_signals && signal_pending(current)) {
|
961 |
|
|
ret = -ERESTARTSYS;
|
962 |
|
|
goto out;
|
963 |
|
|
}
|
964 |
|
|
|
965 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
966 |
|
|
|
967 |
|
|
mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
|
968 |
|
|
"Cluster lock called on freeing lockres %s! flags "
|
969 |
|
|
"0x%lx\n", lockres->l_name, lockres->l_flags);
|
970 |
|
|
|
971 |
|
|
/* We only compare against the currently granted level
|
972 |
|
|
* here. If the lock is blocked waiting on a downconvert,
|
973 |
|
|
* we'll get caught below. */
|
974 |
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY &&
|
975 |
|
|
level > lockres->l_level) {
|
976 |
|
|
/* is someone sitting in dlm_lock? If so, wait on
|
977 |
|
|
* them. */
|
978 |
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
979 |
|
|
wait = 1;
|
980 |
|
|
goto unlock;
|
981 |
|
|
}
|
982 |
|
|
|
983 |
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
|
984 |
|
|
!ocfs2_may_continue_on_blocked_lock(lockres, level)) {
|
985 |
|
|
/* is the lock is currently blocked on behalf of
|
986 |
|
|
* another node */
|
987 |
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
|
988 |
|
|
wait = 1;
|
989 |
|
|
goto unlock;
|
990 |
|
|
}
|
991 |
|
|
|
992 |
|
|
if (level > lockres->l_level) {
|
993 |
|
|
if (lockres->l_action != OCFS2_AST_INVALID)
|
994 |
|
|
mlog(ML_ERROR, "lockres %s has action %u pending\n",
|
995 |
|
|
lockres->l_name, lockres->l_action);
|
996 |
|
|
|
997 |
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
998 |
|
|
lockres->l_action = OCFS2_AST_ATTACH;
|
999 |
|
|
lkm_flags &= ~LKM_CONVERT;
|
1000 |
|
|
} else {
|
1001 |
|
|
lockres->l_action = OCFS2_AST_CONVERT;
|
1002 |
|
|
lkm_flags |= LKM_CONVERT;
|
1003 |
|
|
}
|
1004 |
|
|
|
1005 |
|
|
lockres->l_requested = level;
|
1006 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
1007 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1008 |
|
|
|
1009 |
|
|
BUG_ON(level == LKM_IVMODE);
|
1010 |
|
|
BUG_ON(level == LKM_NLMODE);
|
1011 |
|
|
|
1012 |
|
|
mlog(0, "lock %s, convert from %d to level = %d\n",
|
1013 |
|
|
lockres->l_name, lockres->l_level, level);
|
1014 |
|
|
|
1015 |
|
|
/* call dlm_lock to upgrade lock now */
|
1016 |
|
|
status = dlmlock(osb->dlm,
|
1017 |
|
|
level,
|
1018 |
|
|
&lockres->l_lksb,
|
1019 |
|
|
lkm_flags,
|
1020 |
|
|
lockres->l_name,
|
1021 |
|
|
OCFS2_LOCK_ID_MAX_LEN - 1,
|
1022 |
|
|
ocfs2_locking_ast,
|
1023 |
|
|
lockres,
|
1024 |
|
|
ocfs2_blocking_ast);
|
1025 |
|
|
if (status != DLM_NORMAL) {
|
1026 |
|
|
if ((lkm_flags & LKM_NOQUEUE) &&
|
1027 |
|
|
(status == DLM_NOTQUEUED))
|
1028 |
|
|
ret = -EAGAIN;
|
1029 |
|
|
else {
|
1030 |
|
|
ocfs2_log_dlm_error("dlmlock", status,
|
1031 |
|
|
lockres);
|
1032 |
|
|
ret = -EINVAL;
|
1033 |
|
|
}
|
1034 |
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
1035 |
|
|
goto out;
|
1036 |
|
|
}
|
1037 |
|
|
|
1038 |
|
|
mlog(0, "lock %s, successfull return from dlmlock\n",
|
1039 |
|
|
lockres->l_name);
|
1040 |
|
|
|
1041 |
|
|
/* At this point we've gone inside the dlm and need to
|
1042 |
|
|
* complete our work regardless. */
|
1043 |
|
|
catch_signals = 0;
|
1044 |
|
|
|
1045 |
|
|
/* wait for busy to clear and carry on */
|
1046 |
|
|
goto again;
|
1047 |
|
|
}
|
1048 |
|
|
|
1049 |
|
|
/* Ok, if we get here then we're good to go. */
|
1050 |
|
|
ocfs2_inc_holders(lockres, level);
|
1051 |
|
|
|
1052 |
|
|
ret = 0;
|
1053 |
|
|
unlock:
|
1054 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1055 |
|
|
out:
|
1056 |
|
|
/*
|
1057 |
|
|
* This is helping work around a lock inversion between the page lock
|
1058 |
|
|
* and dlm locks. One path holds the page lock while calling aops
|
1059 |
|
|
* which block acquiring dlm locks. The voting thread holds dlm
|
1060 |
|
|
* locks while acquiring page locks while down converting data locks.
|
1061 |
|
|
* This block is helping an aop path notice the inversion and back
|
1062 |
|
|
* off to unlock its page lock before trying the dlm lock again.
|
1063 |
|
|
*/
|
1064 |
|
|
if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
|
1065 |
|
|
mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
|
1066 |
|
|
wait = 0;
|
1067 |
|
|
if (lockres_remove_mask_waiter(lockres, &mw))
|
1068 |
|
|
ret = -EAGAIN;
|
1069 |
|
|
else
|
1070 |
|
|
goto again;
|
1071 |
|
|
}
|
1072 |
|
|
if (wait) {
|
1073 |
|
|
ret = ocfs2_wait_for_mask(&mw);
|
1074 |
|
|
if (ret == 0)
|
1075 |
|
|
goto again;
|
1076 |
|
|
mlog_errno(ret);
|
1077 |
|
|
}
|
1078 |
|
|
|
1079 |
|
|
mlog_exit(ret);
|
1080 |
|
|
return ret;
|
1081 |
|
|
}
|
1082 |
|
|
|
1083 |
|
|
static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
|
1084 |
|
|
struct ocfs2_lock_res *lockres,
|
1085 |
|
|
int level)
|
1086 |
|
|
{
|
1087 |
|
|
unsigned long flags;
|
1088 |
|
|
|
1089 |
|
|
mlog_entry_void();
|
1090 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
1091 |
|
|
ocfs2_dec_holders(lockres, level);
|
1092 |
|
|
ocfs2_vote_on_unlock(osb, lockres);
|
1093 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1094 |
|
|
mlog_exit_void();
|
1095 |
|
|
}
|
1096 |
|
|
|
1097 |
|
|
static int ocfs2_create_new_lock(struct ocfs2_super *osb,
|
1098 |
|
|
struct ocfs2_lock_res *lockres,
|
1099 |
|
|
int ex,
|
1100 |
|
|
int local)
|
1101 |
|
|
{
|
1102 |
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
1103 |
|
|
unsigned long flags;
|
1104 |
|
|
int lkm_flags = local ? LKM_LOCAL : 0;
|
1105 |
|
|
|
1106 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
1107 |
|
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
|
1108 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
|
1109 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1110 |
|
|
|
1111 |
|
|
return ocfs2_lock_create(osb, lockres, level, lkm_flags);
|
1112 |
|
|
}
|
1113 |
|
|
|
1114 |
|
|
/* Grants us an EX lock on the data and metadata resources, skipping
|
1115 |
|
|
* the normal cluster directory lookup. Use this ONLY on newly created
|
1116 |
|
|
* inodes which other nodes can't possibly see, and which haven't been
|
1117 |
|
|
* hashed in the inode hash yet. This can give us a good performance
|
1118 |
|
|
* increase as it'll skip the network broadcast normally associated
|
1119 |
|
|
* with creating a new lock resource. */
|
1120 |
|
|
int ocfs2_create_new_inode_locks(struct inode *inode)
|
1121 |
|
|
{
|
1122 |
|
|
int ret;
|
1123 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1124 |
|
|
|
1125 |
|
|
BUG_ON(!inode);
|
1126 |
|
|
BUG_ON(!ocfs2_inode_is_new(inode));
|
1127 |
|
|
|
1128 |
|
|
mlog_entry_void();
|
1129 |
|
|
|
1130 |
|
|
mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
|
1131 |
|
|
|
1132 |
|
|
/* NOTE: That we don't increment any of the holder counts, nor
|
1133 |
|
|
* do we add anything to a journal handle. Since this is
|
1134 |
|
|
* supposed to be a new inode which the cluster doesn't know
|
1135 |
|
|
* about yet, there is no need to. As far as the LVB handling
|
1136 |
|
|
* is concerned, this is basically like acquiring an EX lock
|
1137 |
|
|
* on a resource which has an invalid one -- we'll set it
|
1138 |
|
|
* valid when we release the EX. */
|
1139 |
|
|
|
1140 |
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
|
1141 |
|
|
if (ret) {
|
1142 |
|
|
mlog_errno(ret);
|
1143 |
|
|
goto bail;
|
1144 |
|
|
}
|
1145 |
|
|
|
1146 |
|
|
/*
|
1147 |
|
|
* We don't want to use LKM_LOCAL on a meta data lock as they
|
1148 |
|
|
* don't use a generation in their lock names.
|
1149 |
|
|
*/
|
1150 |
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0);
|
1151 |
|
|
if (ret) {
|
1152 |
|
|
mlog_errno(ret);
|
1153 |
|
|
goto bail;
|
1154 |
|
|
}
|
1155 |
|
|
|
1156 |
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
|
1157 |
|
|
if (ret) {
|
1158 |
|
|
mlog_errno(ret);
|
1159 |
|
|
goto bail;
|
1160 |
|
|
}
|
1161 |
|
|
|
1162 |
|
|
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
|
1163 |
|
|
if (ret) {
|
1164 |
|
|
mlog_errno(ret);
|
1165 |
|
|
goto bail;
|
1166 |
|
|
}
|
1167 |
|
|
|
1168 |
|
|
bail:
|
1169 |
|
|
mlog_exit(ret);
|
1170 |
|
|
return ret;
|
1171 |
|
|
}
|
1172 |
|
|
|
1173 |
|
|
int ocfs2_rw_lock(struct inode *inode, int write)
|
1174 |
|
|
{
|
1175 |
|
|
int status, level;
|
1176 |
|
|
struct ocfs2_lock_res *lockres;
|
1177 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1178 |
|
|
|
1179 |
|
|
BUG_ON(!inode);
|
1180 |
|
|
|
1181 |
|
|
mlog_entry_void();
|
1182 |
|
|
|
1183 |
|
|
mlog(0, "inode %llu take %s RW lock\n",
|
1184 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1185 |
|
|
write ? "EXMODE" : "PRMODE");
|
1186 |
|
|
|
1187 |
|
|
if (ocfs2_mount_local(osb))
|
1188 |
|
|
return 0;
|
1189 |
|
|
|
1190 |
|
|
lockres = &OCFS2_I(inode)->ip_rw_lockres;
|
1191 |
|
|
|
1192 |
|
|
level = write ? LKM_EXMODE : LKM_PRMODE;
|
1193 |
|
|
|
1194 |
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
|
1195 |
|
|
0);
|
1196 |
|
|
if (status < 0)
|
1197 |
|
|
mlog_errno(status);
|
1198 |
|
|
|
1199 |
|
|
mlog_exit(status);
|
1200 |
|
|
return status;
|
1201 |
|
|
}
|
1202 |
|
|
|
1203 |
|
|
void ocfs2_rw_unlock(struct inode *inode, int write)
|
1204 |
|
|
{
|
1205 |
|
|
int level = write ? LKM_EXMODE : LKM_PRMODE;
|
1206 |
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
|
1207 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1208 |
|
|
|
1209 |
|
|
mlog_entry_void();
|
1210 |
|
|
|
1211 |
|
|
mlog(0, "inode %llu drop %s RW lock\n",
|
1212 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1213 |
|
|
write ? "EXMODE" : "PRMODE");
|
1214 |
|
|
|
1215 |
|
|
if (!ocfs2_mount_local(osb))
|
1216 |
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
1217 |
|
|
|
1218 |
|
|
mlog_exit_void();
|
1219 |
|
|
}
|
1220 |
|
|
|
1221 |
|
|
/*
|
1222 |
|
|
* ocfs2_open_lock always get PR mode lock.
|
1223 |
|
|
*/
|
1224 |
|
|
int ocfs2_open_lock(struct inode *inode)
|
1225 |
|
|
{
|
1226 |
|
|
int status = 0;
|
1227 |
|
|
struct ocfs2_lock_res *lockres;
|
1228 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1229 |
|
|
|
1230 |
|
|
BUG_ON(!inode);
|
1231 |
|
|
|
1232 |
|
|
mlog_entry_void();
|
1233 |
|
|
|
1234 |
|
|
mlog(0, "inode %llu take PRMODE open lock\n",
|
1235 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
1236 |
|
|
|
1237 |
|
|
if (ocfs2_mount_local(osb))
|
1238 |
|
|
goto out;
|
1239 |
|
|
|
1240 |
|
|
lockres = &OCFS2_I(inode)->ip_open_lockres;
|
1241 |
|
|
|
1242 |
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
|
1243 |
|
|
LKM_PRMODE, 0, 0);
|
1244 |
|
|
if (status < 0)
|
1245 |
|
|
mlog_errno(status);
|
1246 |
|
|
|
1247 |
|
|
out:
|
1248 |
|
|
mlog_exit(status);
|
1249 |
|
|
return status;
|
1250 |
|
|
}
|
1251 |
|
|
|
1252 |
|
|
int ocfs2_try_open_lock(struct inode *inode, int write)
|
1253 |
|
|
{
|
1254 |
|
|
int status = 0, level;
|
1255 |
|
|
struct ocfs2_lock_res *lockres;
|
1256 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1257 |
|
|
|
1258 |
|
|
BUG_ON(!inode);
|
1259 |
|
|
|
1260 |
|
|
mlog_entry_void();
|
1261 |
|
|
|
1262 |
|
|
mlog(0, "inode %llu try to take %s open lock\n",
|
1263 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1264 |
|
|
write ? "EXMODE" : "PRMODE");
|
1265 |
|
|
|
1266 |
|
|
if (ocfs2_mount_local(osb))
|
1267 |
|
|
goto out;
|
1268 |
|
|
|
1269 |
|
|
lockres = &OCFS2_I(inode)->ip_open_lockres;
|
1270 |
|
|
|
1271 |
|
|
level = write ? LKM_EXMODE : LKM_PRMODE;
|
1272 |
|
|
|
1273 |
|
|
/*
|
1274 |
|
|
* The file system may already holding a PRMODE/EXMODE open lock.
|
1275 |
|
|
* Since we pass LKM_NOQUEUE, the request won't block waiting on
|
1276 |
|
|
* other nodes and the -EAGAIN will indicate to the caller that
|
1277 |
|
|
* this inode is still in use.
|
1278 |
|
|
*/
|
1279 |
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
|
1280 |
|
|
level, LKM_NOQUEUE, 0);
|
1281 |
|
|
|
1282 |
|
|
out:
|
1283 |
|
|
mlog_exit(status);
|
1284 |
|
|
return status;
|
1285 |
|
|
}
|
1286 |
|
|
|
1287 |
|
|
/*
|
1288 |
|
|
* ocfs2_open_unlock unlock PR and EX mode open locks.
|
1289 |
|
|
*/
|
1290 |
|
|
void ocfs2_open_unlock(struct inode *inode)
|
1291 |
|
|
{
|
1292 |
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres;
|
1293 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1294 |
|
|
|
1295 |
|
|
mlog_entry_void();
|
1296 |
|
|
|
1297 |
|
|
mlog(0, "inode %llu drop open lock\n",
|
1298 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
1299 |
|
|
|
1300 |
|
|
if (ocfs2_mount_local(osb))
|
1301 |
|
|
goto out;
|
1302 |
|
|
|
1303 |
|
|
if(lockres->l_ro_holders)
|
1304 |
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
|
1305 |
|
|
LKM_PRMODE);
|
1306 |
|
|
if(lockres->l_ex_holders)
|
1307 |
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
|
1308 |
|
|
LKM_EXMODE);
|
1309 |
|
|
|
1310 |
|
|
out:
|
1311 |
|
|
mlog_exit_void();
|
1312 |
|
|
}
|
1313 |
|
|
|
1314 |
|
|
int ocfs2_data_lock_full(struct inode *inode,
|
1315 |
|
|
int write,
|
1316 |
|
|
int arg_flags)
|
1317 |
|
|
{
|
1318 |
|
|
int status = 0, level;
|
1319 |
|
|
struct ocfs2_lock_res *lockres;
|
1320 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1321 |
|
|
|
1322 |
|
|
BUG_ON(!inode);
|
1323 |
|
|
|
1324 |
|
|
mlog_entry_void();
|
1325 |
|
|
|
1326 |
|
|
mlog(0, "inode %llu take %s DATA lock\n",
|
1327 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1328 |
|
|
write ? "EXMODE" : "PRMODE");
|
1329 |
|
|
|
1330 |
|
|
/* We'll allow faking a readonly data lock for
|
1331 |
|
|
* rodevices. */
|
1332 |
|
|
if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
|
1333 |
|
|
if (write) {
|
1334 |
|
|
status = -EROFS;
|
1335 |
|
|
mlog_errno(status);
|
1336 |
|
|
}
|
1337 |
|
|
goto out;
|
1338 |
|
|
}
|
1339 |
|
|
|
1340 |
|
|
if (ocfs2_mount_local(osb))
|
1341 |
|
|
goto out;
|
1342 |
|
|
|
1343 |
|
|
lockres = &OCFS2_I(inode)->ip_data_lockres;
|
1344 |
|
|
|
1345 |
|
|
level = write ? LKM_EXMODE : LKM_PRMODE;
|
1346 |
|
|
|
1347 |
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
|
1348 |
|
|
0, arg_flags);
|
1349 |
|
|
if (status < 0 && status != -EAGAIN)
|
1350 |
|
|
mlog_errno(status);
|
1351 |
|
|
|
1352 |
|
|
out:
|
1353 |
|
|
mlog_exit(status);
|
1354 |
|
|
return status;
|
1355 |
|
|
}
|
1356 |
|
|
|
1357 |
|
|
/* see ocfs2_meta_lock_with_page() */
|
1358 |
|
|
int ocfs2_data_lock_with_page(struct inode *inode,
|
1359 |
|
|
int write,
|
1360 |
|
|
struct page *page)
|
1361 |
|
|
{
|
1362 |
|
|
int ret;
|
1363 |
|
|
|
1364 |
|
|
ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
|
1365 |
|
|
if (ret == -EAGAIN) {
|
1366 |
|
|
unlock_page(page);
|
1367 |
|
|
if (ocfs2_data_lock(inode, write) == 0)
|
1368 |
|
|
ocfs2_data_unlock(inode, write);
|
1369 |
|
|
ret = AOP_TRUNCATED_PAGE;
|
1370 |
|
|
}
|
1371 |
|
|
|
1372 |
|
|
return ret;
|
1373 |
|
|
}
|
1374 |
|
|
|
1375 |
|
|
static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
|
1376 |
|
|
struct ocfs2_lock_res *lockres)
|
1377 |
|
|
{
|
1378 |
|
|
int kick = 0;
|
1379 |
|
|
|
1380 |
|
|
mlog_entry_void();
|
1381 |
|
|
|
1382 |
|
|
/* If we know that another node is waiting on our lock, kick
|
1383 |
|
|
* the vote thread * pre-emptively when we reach a release
|
1384 |
|
|
* condition. */
|
1385 |
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
|
1386 |
|
|
switch(lockres->l_blocking) {
|
1387 |
|
|
case LKM_EXMODE:
|
1388 |
|
|
if (!lockres->l_ex_holders && !lockres->l_ro_holders)
|
1389 |
|
|
kick = 1;
|
1390 |
|
|
break;
|
1391 |
|
|
case LKM_PRMODE:
|
1392 |
|
|
if (!lockres->l_ex_holders)
|
1393 |
|
|
kick = 1;
|
1394 |
|
|
break;
|
1395 |
|
|
default:
|
1396 |
|
|
BUG();
|
1397 |
|
|
}
|
1398 |
|
|
}
|
1399 |
|
|
|
1400 |
|
|
if (kick)
|
1401 |
|
|
ocfs2_kick_vote_thread(osb);
|
1402 |
|
|
|
1403 |
|
|
mlog_exit_void();
|
1404 |
|
|
}
|
1405 |
|
|
|
1406 |
|
|
void ocfs2_data_unlock(struct inode *inode,
|
1407 |
|
|
int write)
|
1408 |
|
|
{
|
1409 |
|
|
int level = write ? LKM_EXMODE : LKM_PRMODE;
|
1410 |
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
|
1411 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1412 |
|
|
|
1413 |
|
|
mlog_entry_void();
|
1414 |
|
|
|
1415 |
|
|
mlog(0, "inode %llu drop %s DATA lock\n",
|
1416 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1417 |
|
|
write ? "EXMODE" : "PRMODE");
|
1418 |
|
|
|
1419 |
|
|
if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
|
1420 |
|
|
!ocfs2_mount_local(osb))
|
1421 |
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
1422 |
|
|
|
1423 |
|
|
mlog_exit_void();
|
1424 |
|
|
}
|
1425 |
|
|
|
1426 |
|
|
#define OCFS2_SEC_BITS 34
|
1427 |
|
|
#define OCFS2_SEC_SHIFT (64 - 34)
|
1428 |
|
|
#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
|
1429 |
|
|
|
1430 |
|
|
/* LVB only has room for 64 bits of time here so we pack it for
|
1431 |
|
|
* now. */
|
1432 |
|
|
static u64 ocfs2_pack_timespec(struct timespec *spec)
|
1433 |
|
|
{
|
1434 |
|
|
u64 res;
|
1435 |
|
|
u64 sec = spec->tv_sec;
|
1436 |
|
|
u32 nsec = spec->tv_nsec;
|
1437 |
|
|
|
1438 |
|
|
res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
|
1439 |
|
|
|
1440 |
|
|
return res;
|
1441 |
|
|
}
|
1442 |
|
|
|
1443 |
|
|
/* Call this with the lockres locked. I am reasonably sure we don't
|
1444 |
|
|
* need ip_lock in this function as anyone who would be changing those
|
1445 |
|
|
* values is supposed to be blocked in ocfs2_meta_lock right now. */
|
1446 |
|
|
static void __ocfs2_stuff_meta_lvb(struct inode *inode)
|
1447 |
|
|
{
|
1448 |
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
1449 |
|
|
struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
|
1450 |
|
|
struct ocfs2_meta_lvb *lvb;
|
1451 |
|
|
|
1452 |
|
|
mlog_entry_void();
|
1453 |
|
|
|
1454 |
|
|
lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
1455 |
|
|
|
1456 |
|
|
/*
|
1457 |
|
|
* Invalidate the LVB of a deleted inode - this way other
|
1458 |
|
|
* nodes are forced to go to disk and discover the new inode
|
1459 |
|
|
* status.
|
1460 |
|
|
*/
|
1461 |
|
|
if (oi->ip_flags & OCFS2_INODE_DELETED) {
|
1462 |
|
|
lvb->lvb_version = 0;
|
1463 |
|
|
goto out;
|
1464 |
|
|
}
|
1465 |
|
|
|
1466 |
|
|
lvb->lvb_version = OCFS2_LVB_VERSION;
|
1467 |
|
|
lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
|
1468 |
|
|
lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
|
1469 |
|
|
lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
|
1470 |
|
|
lvb->lvb_igid = cpu_to_be32(inode->i_gid);
|
1471 |
|
|
lvb->lvb_imode = cpu_to_be16(inode->i_mode);
|
1472 |
|
|
lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
|
1473 |
|
|
lvb->lvb_iatime_packed =
|
1474 |
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
|
1475 |
|
|
lvb->lvb_ictime_packed =
|
1476 |
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
|
1477 |
|
|
lvb->lvb_imtime_packed =
|
1478 |
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
|
1479 |
|
|
lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
|
1480 |
|
|
lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features);
|
1481 |
|
|
lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
|
1482 |
|
|
|
1483 |
|
|
out:
|
1484 |
|
|
mlog_meta_lvb(0, lockres);
|
1485 |
|
|
|
1486 |
|
|
mlog_exit_void();
|
1487 |
|
|
}
|
1488 |
|
|
|
1489 |
|
|
static void ocfs2_unpack_timespec(struct timespec *spec,
|
1490 |
|
|
u64 packed_time)
|
1491 |
|
|
{
|
1492 |
|
|
spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
|
1493 |
|
|
spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
|
1494 |
|
|
}
|
1495 |
|
|
|
1496 |
|
|
static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
|
1497 |
|
|
{
|
1498 |
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
1499 |
|
|
struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
|
1500 |
|
|
struct ocfs2_meta_lvb *lvb;
|
1501 |
|
|
|
1502 |
|
|
mlog_entry_void();
|
1503 |
|
|
|
1504 |
|
|
mlog_meta_lvb(0, lockres);
|
1505 |
|
|
|
1506 |
|
|
lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
1507 |
|
|
|
1508 |
|
|
/* We're safe here without the lockres lock... */
|
1509 |
|
|
spin_lock(&oi->ip_lock);
|
1510 |
|
|
oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
|
1511 |
|
|
i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
|
1512 |
|
|
|
1513 |
|
|
oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
|
1514 |
|
|
oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures);
|
1515 |
|
|
ocfs2_set_inode_flags(inode);
|
1516 |
|
|
|
1517 |
|
|
/* fast-symlinks are a special case */
|
1518 |
|
|
if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
|
1519 |
|
|
inode->i_blocks = 0;
|
1520 |
|
|
else
|
1521 |
|
|
inode->i_blocks = ocfs2_inode_sector_count(inode);
|
1522 |
|
|
|
1523 |
|
|
inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
|
1524 |
|
|
inode->i_gid = be32_to_cpu(lvb->lvb_igid);
|
1525 |
|
|
inode->i_mode = be16_to_cpu(lvb->lvb_imode);
|
1526 |
|
|
inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
|
1527 |
|
|
ocfs2_unpack_timespec(&inode->i_atime,
|
1528 |
|
|
be64_to_cpu(lvb->lvb_iatime_packed));
|
1529 |
|
|
ocfs2_unpack_timespec(&inode->i_mtime,
|
1530 |
|
|
be64_to_cpu(lvb->lvb_imtime_packed));
|
1531 |
|
|
ocfs2_unpack_timespec(&inode->i_ctime,
|
1532 |
|
|
be64_to_cpu(lvb->lvb_ictime_packed));
|
1533 |
|
|
spin_unlock(&oi->ip_lock);
|
1534 |
|
|
|
1535 |
|
|
mlog_exit_void();
|
1536 |
|
|
}
|
1537 |
|
|
|
1538 |
|
|
static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
|
1539 |
|
|
struct ocfs2_lock_res *lockres)
|
1540 |
|
|
{
|
1541 |
|
|
struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
1542 |
|
|
|
1543 |
|
|
if (lvb->lvb_version == OCFS2_LVB_VERSION
|
1544 |
|
|
&& be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
|
1545 |
|
|
return 1;
|
1546 |
|
|
return 0;
|
1547 |
|
|
}
|
1548 |
|
|
|
1549 |
|
|
/* Determine whether a lock resource needs to be refreshed, and
|
1550 |
|
|
* arbitrate who gets to refresh it.
|
1551 |
|
|
*
|
1552 |
|
|
* 0 means no refresh needed.
|
1553 |
|
|
*
|
1554 |
|
|
* > 0 means you need to refresh this and you MUST call
|
1555 |
|
|
* ocfs2_complete_lock_res_refresh afterwards. */
|
1556 |
|
|
static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
|
1557 |
|
|
{
|
1558 |
|
|
unsigned long flags;
|
1559 |
|
|
int status = 0;
|
1560 |
|
|
|
1561 |
|
|
mlog_entry_void();
|
1562 |
|
|
|
1563 |
|
|
refresh_check:
|
1564 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
1565 |
|
|
if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
|
1566 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1567 |
|
|
goto bail;
|
1568 |
|
|
}
|
1569 |
|
|
|
1570 |
|
|
if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
|
1571 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1572 |
|
|
|
1573 |
|
|
ocfs2_wait_on_refreshing_lock(lockres);
|
1574 |
|
|
goto refresh_check;
|
1575 |
|
|
}
|
1576 |
|
|
|
1577 |
|
|
/* Ok, I'll be the one to refresh this lock. */
|
1578 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
|
1579 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1580 |
|
|
|
1581 |
|
|
status = 1;
|
1582 |
|
|
bail:
|
1583 |
|
|
mlog_exit(status);
|
1584 |
|
|
return status;
|
1585 |
|
|
}
|
1586 |
|
|
|
1587 |
|
|
/* If status is non zero, I'll mark it as not being in refresh
|
1588 |
|
|
* anymroe, but i won't clear the needs refresh flag. */
|
1589 |
|
|
static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
|
1590 |
|
|
int status)
|
1591 |
|
|
{
|
1592 |
|
|
unsigned long flags;
|
1593 |
|
|
mlog_entry_void();
|
1594 |
|
|
|
1595 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
1596 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
|
1597 |
|
|
if (!status)
|
1598 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
1599 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
1600 |
|
|
|
1601 |
|
|
wake_up(&lockres->l_event);
|
1602 |
|
|
|
1603 |
|
|
mlog_exit_void();
|
1604 |
|
|
}
|
1605 |
|
|
|
1606 |
|
|
/* may or may not return a bh if it went to disk. */
|
1607 |
|
|
static int ocfs2_meta_lock_update(struct inode *inode,
|
1608 |
|
|
struct buffer_head **bh)
|
1609 |
|
|
{
|
1610 |
|
|
int status = 0;
|
1611 |
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
1612 |
|
|
struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
|
1613 |
|
|
struct ocfs2_dinode *fe;
|
1614 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1615 |
|
|
|
1616 |
|
|
mlog_entry_void();
|
1617 |
|
|
|
1618 |
|
|
if (ocfs2_mount_local(osb))
|
1619 |
|
|
goto bail;
|
1620 |
|
|
|
1621 |
|
|
spin_lock(&oi->ip_lock);
|
1622 |
|
|
if (oi->ip_flags & OCFS2_INODE_DELETED) {
|
1623 |
|
|
mlog(0, "Orphaned inode %llu was deleted while we "
|
1624 |
|
|
"were waiting on a lock. ip_flags = 0x%x\n",
|
1625 |
|
|
(unsigned long long)oi->ip_blkno, oi->ip_flags);
|
1626 |
|
|
spin_unlock(&oi->ip_lock);
|
1627 |
|
|
status = -ENOENT;
|
1628 |
|
|
goto bail;
|
1629 |
|
|
}
|
1630 |
|
|
spin_unlock(&oi->ip_lock);
|
1631 |
|
|
|
1632 |
|
|
if (!ocfs2_should_refresh_lock_res(lockres))
|
1633 |
|
|
goto bail;
|
1634 |
|
|
|
1635 |
|
|
/* This will discard any caching information we might have had
|
1636 |
|
|
* for the inode metadata. */
|
1637 |
|
|
ocfs2_metadata_cache_purge(inode);
|
1638 |
|
|
|
1639 |
|
|
ocfs2_extent_map_trunc(inode, 0);
|
1640 |
|
|
|
1641 |
|
|
if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
|
1642 |
|
|
mlog(0, "Trusting LVB on inode %llu\n",
|
1643 |
|
|
(unsigned long long)oi->ip_blkno);
|
1644 |
|
|
ocfs2_refresh_inode_from_lvb(inode);
|
1645 |
|
|
} else {
|
1646 |
|
|
/* Boo, we have to go to disk. */
|
1647 |
|
|
/* read bh, cast, ocfs2_refresh_inode */
|
1648 |
|
|
status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
|
1649 |
|
|
bh, OCFS2_BH_CACHED, inode);
|
1650 |
|
|
if (status < 0) {
|
1651 |
|
|
mlog_errno(status);
|
1652 |
|
|
goto bail_refresh;
|
1653 |
|
|
}
|
1654 |
|
|
fe = (struct ocfs2_dinode *) (*bh)->b_data;
|
1655 |
|
|
|
1656 |
|
|
/* This is a good chance to make sure we're not
|
1657 |
|
|
* locking an invalid object.
|
1658 |
|
|
*
|
1659 |
|
|
* We bug on a stale inode here because we checked
|
1660 |
|
|
* above whether it was wiped from disk. The wiping
|
1661 |
|
|
* node provides a guarantee that we receive that
|
1662 |
|
|
* message and can mark the inode before dropping any
|
1663 |
|
|
* locks associated with it. */
|
1664 |
|
|
if (!OCFS2_IS_VALID_DINODE(fe)) {
|
1665 |
|
|
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
|
1666 |
|
|
status = -EIO;
|
1667 |
|
|
goto bail_refresh;
|
1668 |
|
|
}
|
1669 |
|
|
mlog_bug_on_msg(inode->i_generation !=
|
1670 |
|
|
le32_to_cpu(fe->i_generation),
|
1671 |
|
|
"Invalid dinode %llu disk generation: %u "
|
1672 |
|
|
"inode->i_generation: %u\n",
|
1673 |
|
|
(unsigned long long)oi->ip_blkno,
|
1674 |
|
|
le32_to_cpu(fe->i_generation),
|
1675 |
|
|
inode->i_generation);
|
1676 |
|
|
mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
|
1677 |
|
|
!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
|
1678 |
|
|
"Stale dinode %llu dtime: %llu flags: 0x%x\n",
|
1679 |
|
|
(unsigned long long)oi->ip_blkno,
|
1680 |
|
|
(unsigned long long)le64_to_cpu(fe->i_dtime),
|
1681 |
|
|
le32_to_cpu(fe->i_flags));
|
1682 |
|
|
|
1683 |
|
|
ocfs2_refresh_inode(inode, fe);
|
1684 |
|
|
}
|
1685 |
|
|
|
1686 |
|
|
status = 0;
|
1687 |
|
|
bail_refresh:
|
1688 |
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
1689 |
|
|
bail:
|
1690 |
|
|
mlog_exit(status);
|
1691 |
|
|
return status;
|
1692 |
|
|
}
|
1693 |
|
|
|
1694 |
|
|
static int ocfs2_assign_bh(struct inode *inode,
|
1695 |
|
|
struct buffer_head **ret_bh,
|
1696 |
|
|
struct buffer_head *passed_bh)
|
1697 |
|
|
{
|
1698 |
|
|
int status;
|
1699 |
|
|
|
1700 |
|
|
if (passed_bh) {
|
1701 |
|
|
/* Ok, the update went to disk for us, use the
|
1702 |
|
|
* returned bh. */
|
1703 |
|
|
*ret_bh = passed_bh;
|
1704 |
|
|
get_bh(*ret_bh);
|
1705 |
|
|
|
1706 |
|
|
return 0;
|
1707 |
|
|
}
|
1708 |
|
|
|
1709 |
|
|
status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
|
1710 |
|
|
OCFS2_I(inode)->ip_blkno,
|
1711 |
|
|
ret_bh,
|
1712 |
|
|
OCFS2_BH_CACHED,
|
1713 |
|
|
inode);
|
1714 |
|
|
if (status < 0)
|
1715 |
|
|
mlog_errno(status);
|
1716 |
|
|
|
1717 |
|
|
return status;
|
1718 |
|
|
}
|
1719 |
|
|
|
1720 |
|
|
/*
|
1721 |
|
|
* returns < 0 error if the callback will never be called, otherwise
|
1722 |
|
|
* the result of the lock will be communicated via the callback.
|
1723 |
|
|
*/
|
1724 |
|
|
int ocfs2_meta_lock_full(struct inode *inode,
|
1725 |
|
|
struct buffer_head **ret_bh,
|
1726 |
|
|
int ex,
|
1727 |
|
|
int arg_flags)
|
1728 |
|
|
{
|
1729 |
|
|
int status, level, dlm_flags, acquired;
|
1730 |
|
|
struct ocfs2_lock_res *lockres = NULL;
|
1731 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1732 |
|
|
struct buffer_head *local_bh = NULL;
|
1733 |
|
|
|
1734 |
|
|
BUG_ON(!inode);
|
1735 |
|
|
|
1736 |
|
|
mlog_entry_void();
|
1737 |
|
|
|
1738 |
|
|
mlog(0, "inode %llu, take %s META lock\n",
|
1739 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1740 |
|
|
ex ? "EXMODE" : "PRMODE");
|
1741 |
|
|
|
1742 |
|
|
status = 0;
|
1743 |
|
|
acquired = 0;
|
1744 |
|
|
/* We'll allow faking a readonly metadata lock for
|
1745 |
|
|
* rodevices. */
|
1746 |
|
|
if (ocfs2_is_hard_readonly(osb)) {
|
1747 |
|
|
if (ex)
|
1748 |
|
|
status = -EROFS;
|
1749 |
|
|
goto bail;
|
1750 |
|
|
}
|
1751 |
|
|
|
1752 |
|
|
if (ocfs2_mount_local(osb))
|
1753 |
|
|
goto local;
|
1754 |
|
|
|
1755 |
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
|
1756 |
|
|
wait_event(osb->recovery_event,
|
1757 |
|
|
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
|
1758 |
|
|
|
1759 |
|
|
lockres = &OCFS2_I(inode)->ip_meta_lockres;
|
1760 |
|
|
level = ex ? LKM_EXMODE : LKM_PRMODE;
|
1761 |
|
|
dlm_flags = 0;
|
1762 |
|
|
if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
|
1763 |
|
|
dlm_flags |= LKM_NOQUEUE;
|
1764 |
|
|
|
1765 |
|
|
status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
|
1766 |
|
|
if (status < 0) {
|
1767 |
|
|
if (status != -EAGAIN && status != -EIOCBRETRY)
|
1768 |
|
|
mlog_errno(status);
|
1769 |
|
|
goto bail;
|
1770 |
|
|
}
|
1771 |
|
|
|
1772 |
|
|
/* Notify the error cleanup path to drop the cluster lock. */
|
1773 |
|
|
acquired = 1;
|
1774 |
|
|
|
1775 |
|
|
/* We wait twice because a node may have died while we were in
|
1776 |
|
|
* the lower dlm layers. The second time though, we've
|
1777 |
|
|
* committed to owning this lock so we don't allow signals to
|
1778 |
|
|
* abort the operation. */
|
1779 |
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
|
1780 |
|
|
wait_event(osb->recovery_event,
|
1781 |
|
|
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
|
1782 |
|
|
|
1783 |
|
|
local:
|
1784 |
|
|
/*
|
1785 |
|
|
* We only see this flag if we're being called from
|
1786 |
|
|
* ocfs2_read_locked_inode(). It means we're locking an inode
|
1787 |
|
|
* which hasn't been populated yet, so clear the refresh flag
|
1788 |
|
|
* and let the caller handle it.
|
1789 |
|
|
*/
|
1790 |
|
|
if (inode->i_state & I_NEW) {
|
1791 |
|
|
status = 0;
|
1792 |
|
|
if (lockres)
|
1793 |
|
|
ocfs2_complete_lock_res_refresh(lockres, 0);
|
1794 |
|
|
goto bail;
|
1795 |
|
|
}
|
1796 |
|
|
|
1797 |
|
|
/* This is fun. The caller may want a bh back, or it may
|
1798 |
|
|
* not. ocfs2_meta_lock_update definitely wants one in, but
|
1799 |
|
|
* may or may not read one, depending on what's in the
|
1800 |
|
|
* LVB. The result of all of this is that we've *only* gone to
|
1801 |
|
|
* disk if we have to, so the complexity is worthwhile. */
|
1802 |
|
|
status = ocfs2_meta_lock_update(inode, &local_bh);
|
1803 |
|
|
if (status < 0) {
|
1804 |
|
|
if (status != -ENOENT)
|
1805 |
|
|
mlog_errno(status);
|
1806 |
|
|
goto bail;
|
1807 |
|
|
}
|
1808 |
|
|
|
1809 |
|
|
if (ret_bh) {
|
1810 |
|
|
status = ocfs2_assign_bh(inode, ret_bh, local_bh);
|
1811 |
|
|
if (status < 0) {
|
1812 |
|
|
mlog_errno(status);
|
1813 |
|
|
goto bail;
|
1814 |
|
|
}
|
1815 |
|
|
}
|
1816 |
|
|
|
1817 |
|
|
bail:
|
1818 |
|
|
if (status < 0) {
|
1819 |
|
|
if (ret_bh && (*ret_bh)) {
|
1820 |
|
|
brelse(*ret_bh);
|
1821 |
|
|
*ret_bh = NULL;
|
1822 |
|
|
}
|
1823 |
|
|
if (acquired)
|
1824 |
|
|
ocfs2_meta_unlock(inode, ex);
|
1825 |
|
|
}
|
1826 |
|
|
|
1827 |
|
|
if (local_bh)
|
1828 |
|
|
brelse(local_bh);
|
1829 |
|
|
|
1830 |
|
|
mlog_exit(status);
|
1831 |
|
|
return status;
|
1832 |
|
|
}
|
1833 |
|
|
|
1834 |
|
|
/*
|
1835 |
|
|
* This is working around a lock inversion between tasks acquiring DLM locks
|
1836 |
|
|
* while holding a page lock and the vote thread which blocks dlm lock acquiry
|
1837 |
|
|
* while acquiring page locks.
|
1838 |
|
|
*
|
1839 |
|
|
* ** These _with_page variantes are only intended to be called from aop
|
1840 |
|
|
* methods that hold page locks and return a very specific *positive* error
|
1841 |
|
|
* code that aop methods pass up to the VFS -- test for errors with != 0. **
|
1842 |
|
|
*
|
1843 |
|
|
* The DLM is called such that it returns -EAGAIN if it would have blocked
|
1844 |
|
|
* waiting for the vote thread. In that case we unlock our page so the vote
|
1845 |
|
|
* thread can make progress. Once we've done this we have to return
|
1846 |
|
|
* AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up
|
1847 |
|
|
* into the VFS who will then immediately retry the aop call.
|
1848 |
|
|
*
|
1849 |
|
|
* We do a blocking lock and immediate unlock before returning, though, so that
|
1850 |
|
|
* the lock has a great chance of being cached on this node by the time the VFS
|
1851 |
|
|
* calls back to retry the aop. This has a potential to livelock as nodes
|
1852 |
|
|
* ping locks back and forth, but that's a risk we're willing to take to avoid
|
1853 |
|
|
* the lock inversion simply.
|
1854 |
|
|
*/
|
1855 |
|
|
int ocfs2_meta_lock_with_page(struct inode *inode,
|
1856 |
|
|
struct buffer_head **ret_bh,
|
1857 |
|
|
int ex,
|
1858 |
|
|
struct page *page)
|
1859 |
|
|
{
|
1860 |
|
|
int ret;
|
1861 |
|
|
|
1862 |
|
|
ret = ocfs2_meta_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK);
|
1863 |
|
|
if (ret == -EAGAIN) {
|
1864 |
|
|
unlock_page(page);
|
1865 |
|
|
if (ocfs2_meta_lock(inode, ret_bh, ex) == 0)
|
1866 |
|
|
ocfs2_meta_unlock(inode, ex);
|
1867 |
|
|
ret = AOP_TRUNCATED_PAGE;
|
1868 |
|
|
}
|
1869 |
|
|
|
1870 |
|
|
return ret;
|
1871 |
|
|
}
|
1872 |
|
|
|
1873 |
|
|
int ocfs2_meta_lock_atime(struct inode *inode,
|
1874 |
|
|
struct vfsmount *vfsmnt,
|
1875 |
|
|
int *level)
|
1876 |
|
|
{
|
1877 |
|
|
int ret;
|
1878 |
|
|
|
1879 |
|
|
mlog_entry_void();
|
1880 |
|
|
ret = ocfs2_meta_lock(inode, NULL, 0);
|
1881 |
|
|
if (ret < 0) {
|
1882 |
|
|
mlog_errno(ret);
|
1883 |
|
|
return ret;
|
1884 |
|
|
}
|
1885 |
|
|
|
1886 |
|
|
/*
|
1887 |
|
|
* If we should update atime, we will get EX lock,
|
1888 |
|
|
* otherwise we just get PR lock.
|
1889 |
|
|
*/
|
1890 |
|
|
if (ocfs2_should_update_atime(inode, vfsmnt)) {
|
1891 |
|
|
struct buffer_head *bh = NULL;
|
1892 |
|
|
|
1893 |
|
|
ocfs2_meta_unlock(inode, 0);
|
1894 |
|
|
ret = ocfs2_meta_lock(inode, &bh, 1);
|
1895 |
|
|
if (ret < 0) {
|
1896 |
|
|
mlog_errno(ret);
|
1897 |
|
|
return ret;
|
1898 |
|
|
}
|
1899 |
|
|
*level = 1;
|
1900 |
|
|
if (ocfs2_should_update_atime(inode, vfsmnt))
|
1901 |
|
|
ocfs2_update_inode_atime(inode, bh);
|
1902 |
|
|
if (bh)
|
1903 |
|
|
brelse(bh);
|
1904 |
|
|
} else
|
1905 |
|
|
*level = 0;
|
1906 |
|
|
|
1907 |
|
|
mlog_exit(ret);
|
1908 |
|
|
return ret;
|
1909 |
|
|
}
|
1910 |
|
|
|
1911 |
|
|
void ocfs2_meta_unlock(struct inode *inode,
|
1912 |
|
|
int ex)
|
1913 |
|
|
{
|
1914 |
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
1915 |
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
|
1916 |
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
1917 |
|
|
|
1918 |
|
|
mlog_entry_void();
|
1919 |
|
|
|
1920 |
|
|
mlog(0, "inode %llu drop %s META lock\n",
|
1921 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
1922 |
|
|
ex ? "EXMODE" : "PRMODE");
|
1923 |
|
|
|
1924 |
|
|
if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
|
1925 |
|
|
!ocfs2_mount_local(osb))
|
1926 |
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
1927 |
|
|
|
1928 |
|
|
mlog_exit_void();
|
1929 |
|
|
}
|
1930 |
|
|
|
1931 |
|
|
int ocfs2_super_lock(struct ocfs2_super *osb,
|
1932 |
|
|
int ex)
|
1933 |
|
|
{
|
1934 |
|
|
int status = 0;
|
1935 |
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
1936 |
|
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
|
1937 |
|
|
struct buffer_head *bh;
|
1938 |
|
|
struct ocfs2_slot_info *si = osb->slot_info;
|
1939 |
|
|
|
1940 |
|
|
mlog_entry_void();
|
1941 |
|
|
|
1942 |
|
|
if (ocfs2_is_hard_readonly(osb))
|
1943 |
|
|
return -EROFS;
|
1944 |
|
|
|
1945 |
|
|
if (ocfs2_mount_local(osb))
|
1946 |
|
|
goto bail;
|
1947 |
|
|
|
1948 |
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
|
1949 |
|
|
if (status < 0) {
|
1950 |
|
|
mlog_errno(status);
|
1951 |
|
|
goto bail;
|
1952 |
|
|
}
|
1953 |
|
|
|
1954 |
|
|
/* The super block lock path is really in the best position to
|
1955 |
|
|
* know when resources covered by the lock need to be
|
1956 |
|
|
* refreshed, so we do it here. Of course, making sense of
|
1957 |
|
|
* everything is up to the caller :) */
|
1958 |
|
|
status = ocfs2_should_refresh_lock_res(lockres);
|
1959 |
|
|
if (status < 0) {
|
1960 |
|
|
mlog_errno(status);
|
1961 |
|
|
goto bail;
|
1962 |
|
|
}
|
1963 |
|
|
if (status) {
|
1964 |
|
|
bh = si->si_bh;
|
1965 |
|
|
status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0,
|
1966 |
|
|
si->si_inode);
|
1967 |
|
|
if (status == 0)
|
1968 |
|
|
ocfs2_update_slot_info(si);
|
1969 |
|
|
|
1970 |
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
1971 |
|
|
|
1972 |
|
|
if (status < 0)
|
1973 |
|
|
mlog_errno(status);
|
1974 |
|
|
}
|
1975 |
|
|
bail:
|
1976 |
|
|
mlog_exit(status);
|
1977 |
|
|
return status;
|
1978 |
|
|
}
|
1979 |
|
|
|
1980 |
|
|
void ocfs2_super_unlock(struct ocfs2_super *osb,
|
1981 |
|
|
int ex)
|
1982 |
|
|
{
|
1983 |
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
1984 |
|
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
|
1985 |
|
|
|
1986 |
|
|
if (!ocfs2_mount_local(osb))
|
1987 |
|
|
ocfs2_cluster_unlock(osb, lockres, level);
|
1988 |
|
|
}
|
1989 |
|
|
|
1990 |
|
|
int ocfs2_rename_lock(struct ocfs2_super *osb)
|
1991 |
|
|
{
|
1992 |
|
|
int status;
|
1993 |
|
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
|
1994 |
|
|
|
1995 |
|
|
if (ocfs2_is_hard_readonly(osb))
|
1996 |
|
|
return -EROFS;
|
1997 |
|
|
|
1998 |
|
|
if (ocfs2_mount_local(osb))
|
1999 |
|
|
return 0;
|
2000 |
|
|
|
2001 |
|
|
status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
|
2002 |
|
|
if (status < 0)
|
2003 |
|
|
mlog_errno(status);
|
2004 |
|
|
|
2005 |
|
|
return status;
|
2006 |
|
|
}
|
2007 |
|
|
|
2008 |
|
|
void ocfs2_rename_unlock(struct ocfs2_super *osb)
|
2009 |
|
|
{
|
2010 |
|
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
|
2011 |
|
|
|
2012 |
|
|
if (!ocfs2_mount_local(osb))
|
2013 |
|
|
ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
|
2014 |
|
|
}
|
2015 |
|
|
|
2016 |
|
|
int ocfs2_dentry_lock(struct dentry *dentry, int ex)
|
2017 |
|
|
{
|
2018 |
|
|
int ret;
|
2019 |
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
2020 |
|
|
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
|
2021 |
|
|
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
|
2022 |
|
|
|
2023 |
|
|
BUG_ON(!dl);
|
2024 |
|
|
|
2025 |
|
|
if (ocfs2_is_hard_readonly(osb))
|
2026 |
|
|
return -EROFS;
|
2027 |
|
|
|
2028 |
|
|
if (ocfs2_mount_local(osb))
|
2029 |
|
|
return 0;
|
2030 |
|
|
|
2031 |
|
|
ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
|
2032 |
|
|
if (ret < 0)
|
2033 |
|
|
mlog_errno(ret);
|
2034 |
|
|
|
2035 |
|
|
return ret;
|
2036 |
|
|
}
|
2037 |
|
|
|
2038 |
|
|
void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
|
2039 |
|
|
{
|
2040 |
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
2041 |
|
|
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
|
2042 |
|
|
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
|
2043 |
|
|
|
2044 |
|
|
if (!ocfs2_mount_local(osb))
|
2045 |
|
|
ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
|
2046 |
|
|
}
|
2047 |
|
|
|
2048 |
|
|
/* Reference counting of the dlm debug structure. We want this because
|
2049 |
|
|
* open references on the debug inodes can live on after a mount, so
|
2050 |
|
|
* we can't rely on the ocfs2_super to always exist. */
|
2051 |
|
|
static void ocfs2_dlm_debug_free(struct kref *kref)
|
2052 |
|
|
{
|
2053 |
|
|
struct ocfs2_dlm_debug *dlm_debug;
|
2054 |
|
|
|
2055 |
|
|
dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
|
2056 |
|
|
|
2057 |
|
|
kfree(dlm_debug);
|
2058 |
|
|
}
|
2059 |
|
|
|
2060 |
|
|
void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
|
2061 |
|
|
{
|
2062 |
|
|
if (dlm_debug)
|
2063 |
|
|
kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
|
2064 |
|
|
}
|
2065 |
|
|
|
2066 |
|
|
static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
|
2067 |
|
|
{
|
2068 |
|
|
kref_get(&debug->d_refcnt);
|
2069 |
|
|
}
|
2070 |
|
|
|
2071 |
|
|
struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
|
2072 |
|
|
{
|
2073 |
|
|
struct ocfs2_dlm_debug *dlm_debug;
|
2074 |
|
|
|
2075 |
|
|
dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
|
2076 |
|
|
if (!dlm_debug) {
|
2077 |
|
|
mlog_errno(-ENOMEM);
|
2078 |
|
|
goto out;
|
2079 |
|
|
}
|
2080 |
|
|
|
2081 |
|
|
kref_init(&dlm_debug->d_refcnt);
|
2082 |
|
|
INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
|
2083 |
|
|
dlm_debug->d_locking_state = NULL;
|
2084 |
|
|
out:
|
2085 |
|
|
return dlm_debug;
|
2086 |
|
|
}
|
2087 |
|
|
|
2088 |
|
|
/* Access to this is arbitrated for us via seq_file->sem. */
|
2089 |
|
|
struct ocfs2_dlm_seq_priv {
|
2090 |
|
|
struct ocfs2_dlm_debug *p_dlm_debug;
|
2091 |
|
|
struct ocfs2_lock_res p_iter_res;
|
2092 |
|
|
struct ocfs2_lock_res p_tmp_res;
|
2093 |
|
|
};
|
2094 |
|
|
|
2095 |
|
|
static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
|
2096 |
|
|
struct ocfs2_dlm_seq_priv *priv)
|
2097 |
|
|
{
|
2098 |
|
|
struct ocfs2_lock_res *iter, *ret = NULL;
|
2099 |
|
|
struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
|
2100 |
|
|
|
2101 |
|
|
assert_spin_locked(&ocfs2_dlm_tracking_lock);
|
2102 |
|
|
|
2103 |
|
|
list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
|
2104 |
|
|
/* discover the head of the list */
|
2105 |
|
|
if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
|
2106 |
|
|
mlog(0, "End of list found, %p\n", ret);
|
2107 |
|
|
break;
|
2108 |
|
|
}
|
2109 |
|
|
|
2110 |
|
|
/* We track our "dummy" iteration lockres' by a NULL
|
2111 |
|
|
* l_ops field. */
|
2112 |
|
|
if (iter->l_ops != NULL) {
|
2113 |
|
|
ret = iter;
|
2114 |
|
|
break;
|
2115 |
|
|
}
|
2116 |
|
|
}
|
2117 |
|
|
|
2118 |
|
|
return ret;
|
2119 |
|
|
}
|
2120 |
|
|
|
2121 |
|
|
static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
|
2122 |
|
|
{
|
2123 |
|
|
struct ocfs2_dlm_seq_priv *priv = m->private;
|
2124 |
|
|
struct ocfs2_lock_res *iter;
|
2125 |
|
|
|
2126 |
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
2127 |
|
|
iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
|
2128 |
|
|
if (iter) {
|
2129 |
|
|
/* Since lockres' have the lifetime of their container
|
2130 |
|
|
* (which can be inodes, ocfs2_supers, etc) we want to
|
2131 |
|
|
* copy this out to a temporary lockres while still
|
2132 |
|
|
* under the spinlock. Obviously after this we can't
|
2133 |
|
|
* trust any pointers on the copy returned, but that's
|
2134 |
|
|
* ok as the information we want isn't typically held
|
2135 |
|
|
* in them. */
|
2136 |
|
|
priv->p_tmp_res = *iter;
|
2137 |
|
|
iter = &priv->p_tmp_res;
|
2138 |
|
|
}
|
2139 |
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
2140 |
|
|
|
2141 |
|
|
return iter;
|
2142 |
|
|
}
|
2143 |
|
|
|
2144 |
|
|
static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
|
2145 |
|
|
{
|
2146 |
|
|
}
|
2147 |
|
|
|
2148 |
|
|
static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
|
2149 |
|
|
{
|
2150 |
|
|
struct ocfs2_dlm_seq_priv *priv = m->private;
|
2151 |
|
|
struct ocfs2_lock_res *iter = v;
|
2152 |
|
|
struct ocfs2_lock_res *dummy = &priv->p_iter_res;
|
2153 |
|
|
|
2154 |
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
2155 |
|
|
iter = ocfs2_dlm_next_res(iter, priv);
|
2156 |
|
|
list_del_init(&dummy->l_debug_list);
|
2157 |
|
|
if (iter) {
|
2158 |
|
|
list_add(&dummy->l_debug_list, &iter->l_debug_list);
|
2159 |
|
|
priv->p_tmp_res = *iter;
|
2160 |
|
|
iter = &priv->p_tmp_res;
|
2161 |
|
|
}
|
2162 |
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
2163 |
|
|
|
2164 |
|
|
return iter;
|
2165 |
|
|
}
|
2166 |
|
|
|
2167 |
|
|
/* So that debugfs.ocfs2 can determine which format is being used */
|
2168 |
|
|
#define OCFS2_DLM_DEBUG_STR_VERSION 1
|
2169 |
|
|
static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
|
2170 |
|
|
{
|
2171 |
|
|
int i;
|
2172 |
|
|
char *lvb;
|
2173 |
|
|
struct ocfs2_lock_res *lockres = v;
|
2174 |
|
|
|
2175 |
|
|
if (!lockres)
|
2176 |
|
|
return -EINVAL;
|
2177 |
|
|
|
2178 |
|
|
seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
|
2179 |
|
|
|
2180 |
|
|
if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
|
2181 |
|
|
seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
|
2182 |
|
|
lockres->l_name,
|
2183 |
|
|
(unsigned int)ocfs2_get_dentry_lock_ino(lockres));
|
2184 |
|
|
else
|
2185 |
|
|
seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
|
2186 |
|
|
|
2187 |
|
|
seq_printf(m, "%d\t"
|
2188 |
|
|
"0x%lx\t"
|
2189 |
|
|
"0x%x\t"
|
2190 |
|
|
"0x%x\t"
|
2191 |
|
|
"%u\t"
|
2192 |
|
|
"%u\t"
|
2193 |
|
|
"%d\t"
|
2194 |
|
|
"%d\t",
|
2195 |
|
|
lockres->l_level,
|
2196 |
|
|
lockres->l_flags,
|
2197 |
|
|
lockres->l_action,
|
2198 |
|
|
lockres->l_unlock_action,
|
2199 |
|
|
lockres->l_ro_holders,
|
2200 |
|
|
lockres->l_ex_holders,
|
2201 |
|
|
lockres->l_requested,
|
2202 |
|
|
lockres->l_blocking);
|
2203 |
|
|
|
2204 |
|
|
/* Dump the raw LVB */
|
2205 |
|
|
lvb = lockres->l_lksb.lvb;
|
2206 |
|
|
for(i = 0; i < DLM_LVB_LEN; i++)
|
2207 |
|
|
seq_printf(m, "0x%x\t", lvb[i]);
|
2208 |
|
|
|
2209 |
|
|
/* End the line */
|
2210 |
|
|
seq_printf(m, "\n");
|
2211 |
|
|
return 0;
|
2212 |
|
|
}
|
2213 |
|
|
|
2214 |
|
|
static struct seq_operations ocfs2_dlm_seq_ops = {
|
2215 |
|
|
.start = ocfs2_dlm_seq_start,
|
2216 |
|
|
.stop = ocfs2_dlm_seq_stop,
|
2217 |
|
|
.next = ocfs2_dlm_seq_next,
|
2218 |
|
|
.show = ocfs2_dlm_seq_show,
|
2219 |
|
|
};
|
2220 |
|
|
|
2221 |
|
|
static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
|
2222 |
|
|
{
|
2223 |
|
|
struct seq_file *seq = (struct seq_file *) file->private_data;
|
2224 |
|
|
struct ocfs2_dlm_seq_priv *priv = seq->private;
|
2225 |
|
|
struct ocfs2_lock_res *res = &priv->p_iter_res;
|
2226 |
|
|
|
2227 |
|
|
ocfs2_remove_lockres_tracking(res);
|
2228 |
|
|
ocfs2_put_dlm_debug(priv->p_dlm_debug);
|
2229 |
|
|
return seq_release_private(inode, file);
|
2230 |
|
|
}
|
2231 |
|
|
|
2232 |
|
|
static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
|
2233 |
|
|
{
|
2234 |
|
|
int ret;
|
2235 |
|
|
struct ocfs2_dlm_seq_priv *priv;
|
2236 |
|
|
struct seq_file *seq;
|
2237 |
|
|
struct ocfs2_super *osb;
|
2238 |
|
|
|
2239 |
|
|
priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
|
2240 |
|
|
if (!priv) {
|
2241 |
|
|
ret = -ENOMEM;
|
2242 |
|
|
mlog_errno(ret);
|
2243 |
|
|
goto out;
|
2244 |
|
|
}
|
2245 |
|
|
osb = inode->i_private;
|
2246 |
|
|
ocfs2_get_dlm_debug(osb->osb_dlm_debug);
|
2247 |
|
|
priv->p_dlm_debug = osb->osb_dlm_debug;
|
2248 |
|
|
INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
|
2249 |
|
|
|
2250 |
|
|
ret = seq_open(file, &ocfs2_dlm_seq_ops);
|
2251 |
|
|
if (ret) {
|
2252 |
|
|
kfree(priv);
|
2253 |
|
|
mlog_errno(ret);
|
2254 |
|
|
goto out;
|
2255 |
|
|
}
|
2256 |
|
|
|
2257 |
|
|
seq = (struct seq_file *) file->private_data;
|
2258 |
|
|
seq->private = priv;
|
2259 |
|
|
|
2260 |
|
|
ocfs2_add_lockres_tracking(&priv->p_iter_res,
|
2261 |
|
|
priv->p_dlm_debug);
|
2262 |
|
|
|
2263 |
|
|
out:
|
2264 |
|
|
return ret;
|
2265 |
|
|
}
|
2266 |
|
|
|
2267 |
|
|
static const struct file_operations ocfs2_dlm_debug_fops = {
|
2268 |
|
|
.open = ocfs2_dlm_debug_open,
|
2269 |
|
|
.release = ocfs2_dlm_debug_release,
|
2270 |
|
|
.read = seq_read,
|
2271 |
|
|
.llseek = seq_lseek,
|
2272 |
|
|
};
|
2273 |
|
|
|
2274 |
|
|
static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
|
2275 |
|
|
{
|
2276 |
|
|
int ret = 0;
|
2277 |
|
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
|
2278 |
|
|
|
2279 |
|
|
dlm_debug->d_locking_state = debugfs_create_file("locking_state",
|
2280 |
|
|
S_IFREG|S_IRUSR,
|
2281 |
|
|
osb->osb_debug_root,
|
2282 |
|
|
osb,
|
2283 |
|
|
&ocfs2_dlm_debug_fops);
|
2284 |
|
|
if (!dlm_debug->d_locking_state) {
|
2285 |
|
|
ret = -EINVAL;
|
2286 |
|
|
mlog(ML_ERROR,
|
2287 |
|
|
"Unable to create locking state debugfs file.\n");
|
2288 |
|
|
goto out;
|
2289 |
|
|
}
|
2290 |
|
|
|
2291 |
|
|
ocfs2_get_dlm_debug(dlm_debug);
|
2292 |
|
|
out:
|
2293 |
|
|
return ret;
|
2294 |
|
|
}
|
2295 |
|
|
|
2296 |
|
|
static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
|
2297 |
|
|
{
|
2298 |
|
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
|
2299 |
|
|
|
2300 |
|
|
if (dlm_debug) {
|
2301 |
|
|
debugfs_remove(dlm_debug->d_locking_state);
|
2302 |
|
|
ocfs2_put_dlm_debug(dlm_debug);
|
2303 |
|
|
}
|
2304 |
|
|
}
|
2305 |
|
|
|
2306 |
|
|
int ocfs2_dlm_init(struct ocfs2_super *osb)
|
2307 |
|
|
{
|
2308 |
|
|
int status = 0;
|
2309 |
|
|
u32 dlm_key;
|
2310 |
|
|
struct dlm_ctxt *dlm = NULL;
|
2311 |
|
|
|
2312 |
|
|
mlog_entry_void();
|
2313 |
|
|
|
2314 |
|
|
if (ocfs2_mount_local(osb))
|
2315 |
|
|
goto local;
|
2316 |
|
|
|
2317 |
|
|
status = ocfs2_dlm_init_debug(osb);
|
2318 |
|
|
if (status < 0) {
|
2319 |
|
|
mlog_errno(status);
|
2320 |
|
|
goto bail;
|
2321 |
|
|
}
|
2322 |
|
|
|
2323 |
|
|
/* launch vote thread */
|
2324 |
|
|
osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote");
|
2325 |
|
|
if (IS_ERR(osb->vote_task)) {
|
2326 |
|
|
status = PTR_ERR(osb->vote_task);
|
2327 |
|
|
osb->vote_task = NULL;
|
2328 |
|
|
mlog_errno(status);
|
2329 |
|
|
goto bail;
|
2330 |
|
|
}
|
2331 |
|
|
|
2332 |
|
|
/* used by the dlm code to make message headers unique, each
|
2333 |
|
|
* node in this domain must agree on this. */
|
2334 |
|
|
dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
|
2335 |
|
|
|
2336 |
|
|
/* for now, uuid == domain */
|
2337 |
|
|
dlm = dlm_register_domain(osb->uuid_str, dlm_key);
|
2338 |
|
|
if (IS_ERR(dlm)) {
|
2339 |
|
|
status = PTR_ERR(dlm);
|
2340 |
|
|
mlog_errno(status);
|
2341 |
|
|
goto bail;
|
2342 |
|
|
}
|
2343 |
|
|
|
2344 |
|
|
dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
|
2345 |
|
|
|
2346 |
|
|
local:
|
2347 |
|
|
ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
|
2348 |
|
|
ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
|
2349 |
|
|
|
2350 |
|
|
osb->dlm = dlm;
|
2351 |
|
|
|
2352 |
|
|
status = 0;
|
2353 |
|
|
bail:
|
2354 |
|
|
if (status < 0) {
|
2355 |
|
|
ocfs2_dlm_shutdown_debug(osb);
|
2356 |
|
|
if (osb->vote_task)
|
2357 |
|
|
kthread_stop(osb->vote_task);
|
2358 |
|
|
}
|
2359 |
|
|
|
2360 |
|
|
mlog_exit(status);
|
2361 |
|
|
return status;
|
2362 |
|
|
}
|
2363 |
|
|
|
2364 |
|
|
void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
|
2365 |
|
|
{
|
2366 |
|
|
mlog_entry_void();
|
2367 |
|
|
|
2368 |
|
|
dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
|
2369 |
|
|
|
2370 |
|
|
ocfs2_drop_osb_locks(osb);
|
2371 |
|
|
|
2372 |
|
|
if (osb->vote_task) {
|
2373 |
|
|
kthread_stop(osb->vote_task);
|
2374 |
|
|
osb->vote_task = NULL;
|
2375 |
|
|
}
|
2376 |
|
|
|
2377 |
|
|
ocfs2_lock_res_free(&osb->osb_super_lockres);
|
2378 |
|
|
ocfs2_lock_res_free(&osb->osb_rename_lockres);
|
2379 |
|
|
|
2380 |
|
|
dlm_unregister_domain(osb->dlm);
|
2381 |
|
|
osb->dlm = NULL;
|
2382 |
|
|
|
2383 |
|
|
ocfs2_dlm_shutdown_debug(osb);
|
2384 |
|
|
|
2385 |
|
|
mlog_exit_void();
|
2386 |
|
|
}
|
2387 |
|
|
|
2388 |
|
|
static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
|
2389 |
|
|
{
|
2390 |
|
|
struct ocfs2_lock_res *lockres = opaque;
|
2391 |
|
|
unsigned long flags;
|
2392 |
|
|
|
2393 |
|
|
mlog_entry_void();
|
2394 |
|
|
|
2395 |
|
|
mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name,
|
2396 |
|
|
lockres->l_unlock_action);
|
2397 |
|
|
|
2398 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2399 |
|
|
/* We tried to cancel a convert request, but it was already
|
2400 |
|
|
* granted. All we want to do here is clear our unlock
|
2401 |
|
|
* state. The wake_up call done at the bottom is redundant
|
2402 |
|
|
* (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
|
2403 |
|
|
* hurt anything anyway */
|
2404 |
|
|
if (status == DLM_CANCELGRANT &&
|
2405 |
|
|
lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
|
2406 |
|
|
mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
|
2407 |
|
|
|
2408 |
|
|
/* We don't clear the busy flag in this case as it
|
2409 |
|
|
* should have been cleared by the ast which the dlm
|
2410 |
|
|
* has called. */
|
2411 |
|
|
goto complete_unlock;
|
2412 |
|
|
}
|
2413 |
|
|
|
2414 |
|
|
if (status != DLM_NORMAL) {
|
2415 |
|
|
mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
|
2416 |
|
|
"unlock_action %d\n", status, lockres->l_name,
|
2417 |
|
|
lockres->l_unlock_action);
|
2418 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2419 |
|
|
return;
|
2420 |
|
|
}
|
2421 |
|
|
|
2422 |
|
|
switch(lockres->l_unlock_action) {
|
2423 |
|
|
case OCFS2_UNLOCK_CANCEL_CONVERT:
|
2424 |
|
|
mlog(0, "Cancel convert success for %s\n", lockres->l_name);
|
2425 |
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
2426 |
|
|
break;
|
2427 |
|
|
case OCFS2_UNLOCK_DROP_LOCK:
|
2428 |
|
|
lockres->l_level = LKM_IVMODE;
|
2429 |
|
|
break;
|
2430 |
|
|
default:
|
2431 |
|
|
BUG();
|
2432 |
|
|
}
|
2433 |
|
|
|
2434 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
2435 |
|
|
complete_unlock:
|
2436 |
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
2437 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2438 |
|
|
|
2439 |
|
|
wake_up(&lockres->l_event);
|
2440 |
|
|
|
2441 |
|
|
mlog_exit_void();
|
2442 |
|
|
}
|
2443 |
|
|
|
2444 |
|
|
static int ocfs2_drop_lock(struct ocfs2_super *osb,
|
2445 |
|
|
struct ocfs2_lock_res *lockres)
|
2446 |
|
|
{
|
2447 |
|
|
enum dlm_status status;
|
2448 |
|
|
unsigned long flags;
|
2449 |
|
|
int lkm_flags = 0;
|
2450 |
|
|
|
2451 |
|
|
/* We didn't get anywhere near actually using this lockres. */
|
2452 |
|
|
if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
|
2453 |
|
|
goto out;
|
2454 |
|
|
|
2455 |
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
|
2456 |
|
|
lkm_flags |= LKM_VALBLK;
|
2457 |
|
|
|
2458 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2459 |
|
|
|
2460 |
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
|
2461 |
|
|
"lockres %s, flags 0x%lx\n",
|
2462 |
|
|
lockres->l_name, lockres->l_flags);
|
2463 |
|
|
|
2464 |
|
|
while (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
2465 |
|
|
mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
|
2466 |
|
|
"%u, unlock_action = %u\n",
|
2467 |
|
|
lockres->l_name, lockres->l_flags, lockres->l_action,
|
2468 |
|
|
lockres->l_unlock_action);
|
2469 |
|
|
|
2470 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2471 |
|
|
|
2472 |
|
|
/* XXX: Today we just wait on any busy
|
2473 |
|
|
* locks... Perhaps we need to cancel converts in the
|
2474 |
|
|
* future? */
|
2475 |
|
|
ocfs2_wait_on_busy_lock(lockres);
|
2476 |
|
|
|
2477 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2478 |
|
|
}
|
2479 |
|
|
|
2480 |
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
|
2481 |
|
|
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
|
2482 |
|
|
lockres->l_level == LKM_EXMODE &&
|
2483 |
|
|
!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
|
2484 |
|
|
lockres->l_ops->set_lvb(lockres);
|
2485 |
|
|
}
|
2486 |
|
|
|
2487 |
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY)
|
2488 |
|
|
mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
|
2489 |
|
|
lockres->l_name);
|
2490 |
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
|
2491 |
|
|
mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
|
2492 |
|
|
|
2493 |
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
2494 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2495 |
|
|
goto out;
|
2496 |
|
|
}
|
2497 |
|
|
|
2498 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
|
2499 |
|
|
|
2500 |
|
|
/* make sure we never get here while waiting for an ast to
|
2501 |
|
|
* fire. */
|
2502 |
|
|
BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
|
2503 |
|
|
|
2504 |
|
|
/* is this necessary? */
|
2505 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
2506 |
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
|
2507 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2508 |
|
|
|
2509 |
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
2510 |
|
|
|
2511 |
|
|
status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
|
2512 |
|
|
ocfs2_unlock_ast, lockres);
|
2513 |
|
|
if (status != DLM_NORMAL) {
|
2514 |
|
|
ocfs2_log_dlm_error("dlmunlock", status, lockres);
|
2515 |
|
|
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
|
2516 |
|
|
dlm_print_one_lock(lockres->l_lksb.lockid);
|
2517 |
|
|
BUG();
|
2518 |
|
|
}
|
2519 |
|
|
mlog(0, "lock %s, successfull return from dlmunlock\n",
|
2520 |
|
|
lockres->l_name);
|
2521 |
|
|
|
2522 |
|
|
ocfs2_wait_on_busy_lock(lockres);
|
2523 |
|
|
out:
|
2524 |
|
|
mlog_exit(0);
|
2525 |
|
|
return 0;
|
2526 |
|
|
}
|
2527 |
|
|
|
2528 |
|
|
/* Mark the lockres as being dropped. It will no longer be
|
2529 |
|
|
* queued if blocking, but we still may have to wait on it
|
2530 |
|
|
* being dequeued from the vote thread before we can consider
|
2531 |
|
|
* it safe to drop.
|
2532 |
|
|
*
|
2533 |
|
|
* You can *not* attempt to call cluster_lock on this lockres anymore. */
|
2534 |
|
|
void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
|
2535 |
|
|
{
|
2536 |
|
|
int status;
|
2537 |
|
|
struct ocfs2_mask_waiter mw;
|
2538 |
|
|
unsigned long flags;
|
2539 |
|
|
|
2540 |
|
|
ocfs2_init_mask_waiter(&mw);
|
2541 |
|
|
|
2542 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2543 |
|
|
lockres->l_flags |= OCFS2_LOCK_FREEING;
|
2544 |
|
|
while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
|
2545 |
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
|
2546 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2547 |
|
|
|
2548 |
|
|
mlog(0, "Waiting on lockres %s\n", lockres->l_name);
|
2549 |
|
|
|
2550 |
|
|
status = ocfs2_wait_for_mask(&mw);
|
2551 |
|
|
if (status)
|
2552 |
|
|
mlog_errno(status);
|
2553 |
|
|
|
2554 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2555 |
|
|
}
|
2556 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2557 |
|
|
}
|
2558 |
|
|
|
2559 |
|
|
void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
|
2560 |
|
|
struct ocfs2_lock_res *lockres)
|
2561 |
|
|
{
|
2562 |
|
|
int ret;
|
2563 |
|
|
|
2564 |
|
|
ocfs2_mark_lockres_freeing(lockres);
|
2565 |
|
|
ret = ocfs2_drop_lock(osb, lockres);
|
2566 |
|
|
if (ret)
|
2567 |
|
|
mlog_errno(ret);
|
2568 |
|
|
}
|
2569 |
|
|
|
2570 |
|
|
static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
|
2571 |
|
|
{
|
2572 |
|
|
ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
|
2573 |
|
|
ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
|
2574 |
|
|
}
|
2575 |
|
|
|
2576 |
|
|
int ocfs2_drop_inode_locks(struct inode *inode)
|
2577 |
|
|
{
|
2578 |
|
|
int status, err;
|
2579 |
|
|
|
2580 |
|
|
mlog_entry_void();
|
2581 |
|
|
|
2582 |
|
|
/* No need to call ocfs2_mark_lockres_freeing here -
|
2583 |
|
|
* ocfs2_clear_inode has done it for us. */
|
2584 |
|
|
|
2585 |
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
2586 |
|
|
&OCFS2_I(inode)->ip_open_lockres);
|
2587 |
|
|
if (err < 0)
|
2588 |
|
|
mlog_errno(err);
|
2589 |
|
|
|
2590 |
|
|
status = err;
|
2591 |
|
|
|
2592 |
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
2593 |
|
|
&OCFS2_I(inode)->ip_data_lockres);
|
2594 |
|
|
if (err < 0)
|
2595 |
|
|
mlog_errno(err);
|
2596 |
|
|
if (err < 0 && !status)
|
2597 |
|
|
status = err;
|
2598 |
|
|
|
2599 |
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
2600 |
|
|
&OCFS2_I(inode)->ip_meta_lockres);
|
2601 |
|
|
if (err < 0)
|
2602 |
|
|
mlog_errno(err);
|
2603 |
|
|
if (err < 0 && !status)
|
2604 |
|
|
status = err;
|
2605 |
|
|
|
2606 |
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
2607 |
|
|
&OCFS2_I(inode)->ip_rw_lockres);
|
2608 |
|
|
if (err < 0)
|
2609 |
|
|
mlog_errno(err);
|
2610 |
|
|
if (err < 0 && !status)
|
2611 |
|
|
status = err;
|
2612 |
|
|
|
2613 |
|
|
mlog_exit(status);
|
2614 |
|
|
return status;
|
2615 |
|
|
}
|
2616 |
|
|
|
2617 |
|
|
static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
|
2618 |
|
|
int new_level)
|
2619 |
|
|
{
|
2620 |
|
|
assert_spin_locked(&lockres->l_lock);
|
2621 |
|
|
|
2622 |
|
|
BUG_ON(lockres->l_blocking <= LKM_NLMODE);
|
2623 |
|
|
|
2624 |
|
|
if (lockres->l_level <= new_level) {
|
2625 |
|
|
mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n",
|
2626 |
|
|
lockres->l_level, new_level);
|
2627 |
|
|
BUG();
|
2628 |
|
|
}
|
2629 |
|
|
|
2630 |
|
|
mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
|
2631 |
|
|
lockres->l_name, new_level, lockres->l_blocking);
|
2632 |
|
|
|
2633 |
|
|
lockres->l_action = OCFS2_AST_DOWNCONVERT;
|
2634 |
|
|
lockres->l_requested = new_level;
|
2635 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
2636 |
|
|
}
|
2637 |
|
|
|
2638 |
|
|
static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
|
2639 |
|
|
struct ocfs2_lock_res *lockres,
|
2640 |
|
|
int new_level,
|
2641 |
|
|
int lvb)
|
2642 |
|
|
{
|
2643 |
|
|
int ret, dlm_flags = LKM_CONVERT;
|
2644 |
|
|
enum dlm_status status;
|
2645 |
|
|
|
2646 |
|
|
mlog_entry_void();
|
2647 |
|
|
|
2648 |
|
|
if (lvb)
|
2649 |
|
|
dlm_flags |= LKM_VALBLK;
|
2650 |
|
|
|
2651 |
|
|
status = dlmlock(osb->dlm,
|
2652 |
|
|
new_level,
|
2653 |
|
|
&lockres->l_lksb,
|
2654 |
|
|
dlm_flags,
|
2655 |
|
|
lockres->l_name,
|
2656 |
|
|
OCFS2_LOCK_ID_MAX_LEN - 1,
|
2657 |
|
|
ocfs2_locking_ast,
|
2658 |
|
|
lockres,
|
2659 |
|
|
ocfs2_blocking_ast);
|
2660 |
|
|
if (status != DLM_NORMAL) {
|
2661 |
|
|
ocfs2_log_dlm_error("dlmlock", status, lockres);
|
2662 |
|
|
ret = -EINVAL;
|
2663 |
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
2664 |
|
|
goto bail;
|
2665 |
|
|
}
|
2666 |
|
|
|
2667 |
|
|
ret = 0;
|
2668 |
|
|
bail:
|
2669 |
|
|
mlog_exit(ret);
|
2670 |
|
|
return ret;
|
2671 |
|
|
}
|
2672 |
|
|
|
2673 |
|
|
/* returns 1 when the caller should unlock and call dlmunlock */
|
2674 |
|
|
static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
|
2675 |
|
|
struct ocfs2_lock_res *lockres)
|
2676 |
|
|
{
|
2677 |
|
|
assert_spin_locked(&lockres->l_lock);
|
2678 |
|
|
|
2679 |
|
|
mlog_entry_void();
|
2680 |
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
2681 |
|
|
|
2682 |
|
|
if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
|
2683 |
|
|
/* If we're already trying to cancel a lock conversion
|
2684 |
|
|
* then just drop the spinlock and allow the caller to
|
2685 |
|
|
* requeue this lock. */
|
2686 |
|
|
|
2687 |
|
|
mlog(0, "Lockres %s, skip convert\n", lockres->l_name);
|
2688 |
|
|
return 0;
|
2689 |
|
|
}
|
2690 |
|
|
|
2691 |
|
|
/* were we in a convert when we got the bast fire? */
|
2692 |
|
|
BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
|
2693 |
|
|
lockres->l_action != OCFS2_AST_DOWNCONVERT);
|
2694 |
|
|
/* set things up for the unlockast to know to just
|
2695 |
|
|
* clear out the ast_action and unset busy, etc. */
|
2696 |
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
|
2697 |
|
|
|
2698 |
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
|
2699 |
|
|
"lock %s, invalid flags: 0x%lx\n",
|
2700 |
|
|
lockres->l_name, lockres->l_flags);
|
2701 |
|
|
|
2702 |
|
|
return 1;
|
2703 |
|
|
}
|
2704 |
|
|
|
2705 |
|
|
static int ocfs2_cancel_convert(struct ocfs2_super *osb,
|
2706 |
|
|
struct ocfs2_lock_res *lockres)
|
2707 |
|
|
{
|
2708 |
|
|
int ret;
|
2709 |
|
|
enum dlm_status status;
|
2710 |
|
|
|
2711 |
|
|
mlog_entry_void();
|
2712 |
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
2713 |
|
|
|
2714 |
|
|
ret = 0;
|
2715 |
|
|
status = dlmunlock(osb->dlm,
|
2716 |
|
|
&lockres->l_lksb,
|
2717 |
|
|
LKM_CANCEL,
|
2718 |
|
|
ocfs2_unlock_ast,
|
2719 |
|
|
lockres);
|
2720 |
|
|
if (status != DLM_NORMAL) {
|
2721 |
|
|
ocfs2_log_dlm_error("dlmunlock", status, lockres);
|
2722 |
|
|
ret = -EINVAL;
|
2723 |
|
|
ocfs2_recover_from_dlm_error(lockres, 0);
|
2724 |
|
|
}
|
2725 |
|
|
|
2726 |
|
|
mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
|
2727 |
|
|
|
2728 |
|
|
mlog_exit(ret);
|
2729 |
|
|
return ret;
|
2730 |
|
|
}
|
2731 |
|
|
|
2732 |
|
|
static int ocfs2_unblock_lock(struct ocfs2_super *osb,
|
2733 |
|
|
struct ocfs2_lock_res *lockres,
|
2734 |
|
|
struct ocfs2_unblock_ctl *ctl)
|
2735 |
|
|
{
|
2736 |
|
|
unsigned long flags;
|
2737 |
|
|
int blocking;
|
2738 |
|
|
int new_level;
|
2739 |
|
|
int ret = 0;
|
2740 |
|
|
int set_lvb = 0;
|
2741 |
|
|
|
2742 |
|
|
mlog_entry_void();
|
2743 |
|
|
|
2744 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2745 |
|
|
|
2746 |
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
2747 |
|
|
|
2748 |
|
|
recheck:
|
2749 |
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
2750 |
|
|
ctl->requeue = 1;
|
2751 |
|
|
ret = ocfs2_prepare_cancel_convert(osb, lockres);
|
2752 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2753 |
|
|
if (ret) {
|
2754 |
|
|
ret = ocfs2_cancel_convert(osb, lockres);
|
2755 |
|
|
if (ret < 0)
|
2756 |
|
|
mlog_errno(ret);
|
2757 |
|
|
}
|
2758 |
|
|
goto leave;
|
2759 |
|
|
}
|
2760 |
|
|
|
2761 |
|
|
/* if we're blocking an exclusive and we have *any* holders,
|
2762 |
|
|
* then requeue. */
|
2763 |
|
|
if ((lockres->l_blocking == LKM_EXMODE)
|
2764 |
|
|
&& (lockres->l_ex_holders || lockres->l_ro_holders))
|
2765 |
|
|
goto leave_requeue;
|
2766 |
|
|
|
2767 |
|
|
/* If it's a PR we're blocking, then only
|
2768 |
|
|
* requeue if we've got any EX holders */
|
2769 |
|
|
if (lockres->l_blocking == LKM_PRMODE &&
|
2770 |
|
|
lockres->l_ex_holders)
|
2771 |
|
|
goto leave_requeue;
|
2772 |
|
|
|
2773 |
|
|
/*
|
2774 |
|
|
* Can we get a lock in this state if the holder counts are
|
2775 |
|
|
* zero? The meta data unblock code used to check this.
|
2776 |
|
|
*/
|
2777 |
|
|
if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
|
2778 |
|
|
&& (lockres->l_flags & OCFS2_LOCK_REFRESHING))
|
2779 |
|
|
goto leave_requeue;
|
2780 |
|
|
|
2781 |
|
|
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
2782 |
|
|
|
2783 |
|
|
if (lockres->l_ops->check_downconvert
|
2784 |
|
|
&& !lockres->l_ops->check_downconvert(lockres, new_level))
|
2785 |
|
|
goto leave_requeue;
|
2786 |
|
|
|
2787 |
|
|
/* If we get here, then we know that there are no more
|
2788 |
|
|
* incompatible holders (and anyone asking for an incompatible
|
2789 |
|
|
* lock is blocked). We can now downconvert the lock */
|
2790 |
|
|
if (!lockres->l_ops->downconvert_worker)
|
2791 |
|
|
goto downconvert;
|
2792 |
|
|
|
2793 |
|
|
/* Some lockres types want to do a bit of work before
|
2794 |
|
|
* downconverting a lock. Allow that here. The worker function
|
2795 |
|
|
* may sleep, so we save off a copy of what we're blocking as
|
2796 |
|
|
* it may change while we're not holding the spin lock. */
|
2797 |
|
|
blocking = lockres->l_blocking;
|
2798 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2799 |
|
|
|
2800 |
|
|
ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
|
2801 |
|
|
|
2802 |
|
|
if (ctl->unblock_action == UNBLOCK_STOP_POST)
|
2803 |
|
|
goto leave;
|
2804 |
|
|
|
2805 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2806 |
|
|
if (blocking != lockres->l_blocking) {
|
2807 |
|
|
/* If this changed underneath us, then we can't drop
|
2808 |
|
|
* it just yet. */
|
2809 |
|
|
goto recheck;
|
2810 |
|
|
}
|
2811 |
|
|
|
2812 |
|
|
downconvert:
|
2813 |
|
|
ctl->requeue = 0;
|
2814 |
|
|
|
2815 |
|
|
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
|
2816 |
|
|
if (lockres->l_level == LKM_EXMODE)
|
2817 |
|
|
set_lvb = 1;
|
2818 |
|
|
|
2819 |
|
|
/*
|
2820 |
|
|
* We only set the lvb if the lock has been fully
|
2821 |
|
|
* refreshed - otherwise we risk setting stale
|
2822 |
|
|
* data. Otherwise, there's no need to actually clear
|
2823 |
|
|
* out the lvb here as it's value is still valid.
|
2824 |
|
|
*/
|
2825 |
|
|
if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
|
2826 |
|
|
lockres->l_ops->set_lvb(lockres);
|
2827 |
|
|
}
|
2828 |
|
|
|
2829 |
|
|
ocfs2_prepare_downconvert(lockres, new_level);
|
2830 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2831 |
|
|
ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
|
2832 |
|
|
leave:
|
2833 |
|
|
mlog_exit(ret);
|
2834 |
|
|
return ret;
|
2835 |
|
|
|
2836 |
|
|
leave_requeue:
|
2837 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2838 |
|
|
ctl->requeue = 1;
|
2839 |
|
|
|
2840 |
|
|
mlog_exit(0);
|
2841 |
|
|
return 0;
|
2842 |
|
|
}
|
2843 |
|
|
|
2844 |
|
|
static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
|
2845 |
|
|
int blocking)
|
2846 |
|
|
{
|
2847 |
|
|
struct inode *inode;
|
2848 |
|
|
struct address_space *mapping;
|
2849 |
|
|
|
2850 |
|
|
inode = ocfs2_lock_res_inode(lockres);
|
2851 |
|
|
mapping = inode->i_mapping;
|
2852 |
|
|
|
2853 |
|
|
/*
|
2854 |
|
|
* We need this before the filemap_fdatawrite() so that it can
|
2855 |
|
|
* transfer the dirty bit from the PTE to the
|
2856 |
|
|
* page. Unfortunately this means that even for EX->PR
|
2857 |
|
|
* downconverts, we'll lose our mappings and have to build
|
2858 |
|
|
* them up again.
|
2859 |
|
|
*/
|
2860 |
|
|
unmap_mapping_range(mapping, 0, 0, 0);
|
2861 |
|
|
|
2862 |
|
|
if (filemap_fdatawrite(mapping)) {
|
2863 |
|
|
mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
|
2864 |
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
2865 |
|
|
}
|
2866 |
|
|
sync_mapping_buffers(mapping);
|
2867 |
|
|
if (blocking == LKM_EXMODE) {
|
2868 |
|
|
truncate_inode_pages(mapping, 0);
|
2869 |
|
|
} else {
|
2870 |
|
|
/* We only need to wait on the I/O if we're not also
|
2871 |
|
|
* truncating pages because truncate_inode_pages waits
|
2872 |
|
|
* for us above. We don't truncate pages if we're
|
2873 |
|
|
* blocking anything < EXMODE because we want to keep
|
2874 |
|
|
* them around in that case. */
|
2875 |
|
|
filemap_fdatawait(mapping);
|
2876 |
|
|
}
|
2877 |
|
|
|
2878 |
|
|
return UNBLOCK_CONTINUE;
|
2879 |
|
|
}
|
2880 |
|
|
|
2881 |
|
|
static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
|
2882 |
|
|
int new_level)
|
2883 |
|
|
{
|
2884 |
|
|
struct inode *inode = ocfs2_lock_res_inode(lockres);
|
2885 |
|
|
int checkpointed = ocfs2_inode_fully_checkpointed(inode);
|
2886 |
|
|
|
2887 |
|
|
BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
|
2888 |
|
|
BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed);
|
2889 |
|
|
|
2890 |
|
|
if (checkpointed)
|
2891 |
|
|
return 1;
|
2892 |
|
|
|
2893 |
|
|
ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb));
|
2894 |
|
|
return 0;
|
2895 |
|
|
}
|
2896 |
|
|
|
2897 |
|
|
static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
|
2898 |
|
|
{
|
2899 |
|
|
struct inode *inode = ocfs2_lock_res_inode(lockres);
|
2900 |
|
|
|
2901 |
|
|
__ocfs2_stuff_meta_lvb(inode);
|
2902 |
|
|
}
|
2903 |
|
|
|
2904 |
|
|
/*
|
2905 |
|
|
* Does the final reference drop on our dentry lock. Right now this
|
2906 |
|
|
* happens in the vote thread, but we could choose to simplify the
|
2907 |
|
|
* dlmglue API and push these off to the ocfs2_wq in the future.
|
2908 |
|
|
*/
|
2909 |
|
|
static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
|
2910 |
|
|
struct ocfs2_lock_res *lockres)
|
2911 |
|
|
{
|
2912 |
|
|
struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
|
2913 |
|
|
ocfs2_dentry_lock_put(osb, dl);
|
2914 |
|
|
}
|
2915 |
|
|
|
2916 |
|
|
/*
|
2917 |
|
|
* d_delete() matching dentries before the lock downconvert.
|
2918 |
|
|
*
|
2919 |
|
|
* At this point, any process waiting to destroy the
|
2920 |
|
|
* dentry_lock due to last ref count is stopped by the
|
2921 |
|
|
* OCFS2_LOCK_QUEUED flag.
|
2922 |
|
|
*
|
2923 |
|
|
* We have two potential problems
|
2924 |
|
|
*
|
2925 |
|
|
* 1) If we do the last reference drop on our dentry_lock (via dput)
|
2926 |
|
|
* we'll wind up in ocfs2_release_dentry_lock(), waiting on
|
2927 |
|
|
* the downconvert to finish. Instead we take an elevated
|
2928 |
|
|
* reference and push the drop until after we've completed our
|
2929 |
|
|
* unblock processing.
|
2930 |
|
|
*
|
2931 |
|
|
* 2) There might be another process with a final reference,
|
2932 |
|
|
* waiting on us to finish processing. If this is the case, we
|
2933 |
|
|
* detect it and exit out - there's no more dentries anyway.
|
2934 |
|
|
*/
|
2935 |
|
|
static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
|
2936 |
|
|
int blocking)
|
2937 |
|
|
{
|
2938 |
|
|
struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
|
2939 |
|
|
struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
|
2940 |
|
|
struct dentry *dentry;
|
2941 |
|
|
unsigned long flags;
|
2942 |
|
|
int extra_ref = 0;
|
2943 |
|
|
|
2944 |
|
|
/*
|
2945 |
|
|
* This node is blocking another node from getting a read
|
2946 |
|
|
* lock. This happens when we've renamed within a
|
2947 |
|
|
* directory. We've forced the other nodes to d_delete(), but
|
2948 |
|
|
* we never actually dropped our lock because it's still
|
2949 |
|
|
* valid. The downconvert code will retain a PR for this node,
|
2950 |
|
|
* so there's no further work to do.
|
2951 |
|
|
*/
|
2952 |
|
|
if (blocking == LKM_PRMODE)
|
2953 |
|
|
return UNBLOCK_CONTINUE;
|
2954 |
|
|
|
2955 |
|
|
/*
|
2956 |
|
|
* Mark this inode as potentially orphaned. The code in
|
2957 |
|
|
* ocfs2_delete_inode() will figure out whether it actually
|
2958 |
|
|
* needs to be freed or not.
|
2959 |
|
|
*/
|
2960 |
|
|
spin_lock(&oi->ip_lock);
|
2961 |
|
|
oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
|
2962 |
|
|
spin_unlock(&oi->ip_lock);
|
2963 |
|
|
|
2964 |
|
|
/*
|
2965 |
|
|
* Yuck. We need to make sure however that the check of
|
2966 |
|
|
* OCFS2_LOCK_FREEING and the extra reference are atomic with
|
2967 |
|
|
* respect to a reference decrement or the setting of that
|
2968 |
|
|
* flag.
|
2969 |
|
|
*/
|
2970 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
2971 |
|
|
spin_lock(&dentry_attach_lock);
|
2972 |
|
|
if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
|
2973 |
|
|
&& dl->dl_count) {
|
2974 |
|
|
dl->dl_count++;
|
2975 |
|
|
extra_ref = 1;
|
2976 |
|
|
}
|
2977 |
|
|
spin_unlock(&dentry_attach_lock);
|
2978 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
2979 |
|
|
|
2980 |
|
|
mlog(0, "extra_ref = %d\n", extra_ref);
|
2981 |
|
|
|
2982 |
|
|
/*
|
2983 |
|
|
* We have a process waiting on us in ocfs2_dentry_iput(),
|
2984 |
|
|
* which means we can't have any more outstanding
|
2985 |
|
|
* aliases. There's no need to do any more work.
|
2986 |
|
|
*/
|
2987 |
|
|
if (!extra_ref)
|
2988 |
|
|
return UNBLOCK_CONTINUE;
|
2989 |
|
|
|
2990 |
|
|
spin_lock(&dentry_attach_lock);
|
2991 |
|
|
while (1) {
|
2992 |
|
|
dentry = ocfs2_find_local_alias(dl->dl_inode,
|
2993 |
|
|
dl->dl_parent_blkno, 1);
|
2994 |
|
|
if (!dentry)
|
2995 |
|
|
break;
|
2996 |
|
|
spin_unlock(&dentry_attach_lock);
|
2997 |
|
|
|
2998 |
|
|
mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
|
2999 |
|
|
dentry->d_name.name);
|
3000 |
|
|
|
3001 |
|
|
/*
|
3002 |
|
|
* The following dcache calls may do an
|
3003 |
|
|
* iput(). Normally we don't want that from the
|
3004 |
|
|
* downconverting thread, but in this case it's ok
|
3005 |
|
|
* because the requesting node already has an
|
3006 |
|
|
* exclusive lock on the inode, so it can't be queued
|
3007 |
|
|
* for a downconvert.
|
3008 |
|
|
*/
|
3009 |
|
|
d_delete(dentry);
|
3010 |
|
|
dput(dentry);
|
3011 |
|
|
|
3012 |
|
|
spin_lock(&dentry_attach_lock);
|
3013 |
|
|
}
|
3014 |
|
|
spin_unlock(&dentry_attach_lock);
|
3015 |
|
|
|
3016 |
|
|
/*
|
3017 |
|
|
* If we are the last holder of this dentry lock, there is no
|
3018 |
|
|
* reason to downconvert so skip straight to the unlock.
|
3019 |
|
|
*/
|
3020 |
|
|
if (dl->dl_count == 1)
|
3021 |
|
|
return UNBLOCK_STOP_POST;
|
3022 |
|
|
|
3023 |
|
|
return UNBLOCK_CONTINUE_POST;
|
3024 |
|
|
}
|
3025 |
|
|
|
3026 |
|
|
void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
|
3027 |
|
|
struct ocfs2_lock_res *lockres)
|
3028 |
|
|
{
|
3029 |
|
|
int status;
|
3030 |
|
|
struct ocfs2_unblock_ctl ctl = {0, 0,};
|
3031 |
|
|
unsigned long flags;
|
3032 |
|
|
|
3033 |
|
|
/* Our reference to the lockres in this function can be
|
3034 |
|
|
* considered valid until we remove the OCFS2_LOCK_QUEUED
|
3035 |
|
|
* flag. */
|
3036 |
|
|
|
3037 |
|
|
mlog_entry_void();
|
3038 |
|
|
|
3039 |
|
|
BUG_ON(!lockres);
|
3040 |
|
|
BUG_ON(!lockres->l_ops);
|
3041 |
|
|
|
3042 |
|
|
mlog(0, "lockres %s blocked.\n", lockres->l_name);
|
3043 |
|
|
|
3044 |
|
|
/* Detect whether a lock has been marked as going away while
|
3045 |
|
|
* the vote thread was processing other things. A lock can
|
3046 |
|
|
* still be marked with OCFS2_LOCK_FREEING after this check,
|
3047 |
|
|
* but short circuiting here will still save us some
|
3048 |
|
|
* performance. */
|
3049 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
3050 |
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING)
|
3051 |
|
|
goto unqueue;
|
3052 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
3053 |
|
|
|
3054 |
|
|
status = ocfs2_unblock_lock(osb, lockres, &ctl);
|
3055 |
|
|
if (status < 0)
|
3056 |
|
|
mlog_errno(status);
|
3057 |
|
|
|
3058 |
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
3059 |
|
|
unqueue:
|
3060 |
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
|
3061 |
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
|
3062 |
|
|
} else
|
3063 |
|
|
ocfs2_schedule_blocked_lock(osb, lockres);
|
3064 |
|
|
|
3065 |
|
|
mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
|
3066 |
|
|
ctl.requeue ? "yes" : "no");
|
3067 |
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
3068 |
|
|
|
3069 |
|
|
if (ctl.unblock_action != UNBLOCK_CONTINUE
|
3070 |
|
|
&& lockres->l_ops->post_unlock)
|
3071 |
|
|
lockres->l_ops->post_unlock(osb, lockres);
|
3072 |
|
|
|
3073 |
|
|
mlog_exit_void();
|
3074 |
|
|
}
|
3075 |
|
|
|
3076 |
|
|
static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
|
3077 |
|
|
struct ocfs2_lock_res *lockres)
|
3078 |
|
|
{
|
3079 |
|
|
mlog_entry_void();
|
3080 |
|
|
|
3081 |
|
|
assert_spin_locked(&lockres->l_lock);
|
3082 |
|
|
|
3083 |
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING) {
|
3084 |
|
|
/* Do not schedule a lock for downconvert when it's on
|
3085 |
|
|
* the way to destruction - any nodes wanting access
|
3086 |
|
|
* to the resource will get it soon. */
|
3087 |
|
|
mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
|
3088 |
|
|
lockres->l_name, lockres->l_flags);
|
3089 |
|
|
return;
|
3090 |
|
|
}
|
3091 |
|
|
|
3092 |
|
|
lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
|
3093 |
|
|
|
3094 |
|
|
spin_lock(&osb->vote_task_lock);
|
3095 |
|
|
if (list_empty(&lockres->l_blocked_list)) {
|
3096 |
|
|
list_add_tail(&lockres->l_blocked_list,
|
3097 |
|
|
&osb->blocked_lock_list);
|
3098 |
|
|
osb->blocked_lock_count++;
|
3099 |
|
|
}
|
3100 |
|
|
spin_unlock(&osb->vote_task_lock);
|
3101 |
|
|
|
3102 |
|
|
mlog_exit_void();
|
3103 |
|
|
}
|