2907 lines
74 KiB
C
2907 lines
74 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dlmglue.c
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*
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* Code which implements an OCFS2 specific interface to our DLM.
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*
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* Copyright (C) 2003, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.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 "dlmglue.h"
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#include "extent_map.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 void ocfs2_inode_ast_func(void *opaque);
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static void ocfs2_inode_bast_func(void *opaque,
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int level);
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static void ocfs2_super_ast_func(void *opaque);
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static void ocfs2_super_bast_func(void *opaque,
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int level);
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static void ocfs2_rename_ast_func(void *opaque);
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static void ocfs2_rename_bast_func(void *opaque,
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int level);
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/* so far, all locks have gotten along with the same unlock ast */
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static void ocfs2_unlock_ast_func(void *opaque,
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enum dlm_status status);
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static int ocfs2_do_unblock_meta(struct inode *inode,
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int *requeue);
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static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
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int *requeue);
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static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
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int *requeue);
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static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
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int *requeue);
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static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
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int *requeue);
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typedef void (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
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static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres,
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int *requeue,
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ocfs2_convert_worker_t *worker);
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struct ocfs2_lock_res_ops {
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void (*ast)(void *);
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void (*bast)(void *, int);
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void (*unlock_ast)(void *, enum dlm_status);
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int (*unblock)(struct ocfs2_lock_res *, int *);
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};
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static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
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.ast = ocfs2_inode_ast_func,
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.bast = ocfs2_inode_bast_func,
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.unlock_ast = ocfs2_unlock_ast_func,
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.unblock = ocfs2_unblock_inode_lock,
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};
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static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
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.ast = ocfs2_inode_ast_func,
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.bast = ocfs2_inode_bast_func,
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.unlock_ast = ocfs2_unlock_ast_func,
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.unblock = ocfs2_unblock_meta,
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};
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static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
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int blocking);
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static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
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.ast = ocfs2_inode_ast_func,
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.bast = ocfs2_inode_bast_func,
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.unlock_ast = ocfs2_unlock_ast_func,
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.unblock = ocfs2_unblock_data,
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};
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static struct ocfs2_lock_res_ops ocfs2_super_lops = {
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.ast = ocfs2_super_ast_func,
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.bast = ocfs2_super_bast_func,
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.unlock_ast = ocfs2_unlock_ast_func,
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.unblock = ocfs2_unblock_osb_lock,
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};
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static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
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.ast = ocfs2_rename_ast_func,
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.bast = ocfs2_rename_bast_func,
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.unlock_ast = ocfs2_unlock_ast_func,
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.unblock = ocfs2_unblock_osb_lock,
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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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}
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static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres)
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{
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return lockres->l_type == OCFS2_LOCK_TYPE_SUPER;
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}
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static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres)
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{
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return lockres->l_type == OCFS2_LOCK_TYPE_RENAME;
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}
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static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres)
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{
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BUG_ON(!ocfs2_is_super_lock(lockres)
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&& !ocfs2_is_rename_lock(lockres));
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return (struct ocfs2_super *) lockres->l_priv;
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}
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static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
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{
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BUG_ON(!ocfs2_is_inode_lock(lockres));
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return (struct inode *) lockres->l_priv;
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}
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static 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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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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static int ocfs2_meta_lock_update(struct inode *inode,
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struct buffer_head **bh);
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static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
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static inline int ocfs2_highest_compat_lock_level(int level);
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static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
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struct ocfs2_lock_res *lockres,
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int new_level);
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static char *ocfs2_lock_type_strings[] = {
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[OCFS2_LOCK_TYPE_META] = "Meta",
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[OCFS2_LOCK_TYPE_DATA] = "Data",
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[OCFS2_LOCK_TYPE_SUPER] = "Super",
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[OCFS2_LOCK_TYPE_RENAME] = "Rename",
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/* Need to differntiate from [R]ename.. serializing writes is the
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* important job it does, anyway. */
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[OCFS2_LOCK_TYPE_RW] = "Write/Read",
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};
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static char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
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{
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mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type);
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return ocfs2_lock_type_strings[type];
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}
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static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
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u64 blkno,
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u32 generation,
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char *name)
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{
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int len;
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mlog_entry_void();
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BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
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len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
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ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
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(long long)blkno, generation);
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BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
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mlog(0, "built lock resource with name: %s\n", name);
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mlog_exit_void();
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}
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static spinlock_t ocfs2_dlm_tracking_lock = SPIN_LOCK_UNLOCKED;
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static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
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struct ocfs2_dlm_debug *dlm_debug)
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{
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mlog(0, "Add tracking for lockres %s\n", res->l_name);
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spin_lock(&ocfs2_dlm_tracking_lock);
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list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
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spin_unlock(&ocfs2_dlm_tracking_lock);
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}
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static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
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{
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spin_lock(&ocfs2_dlm_tracking_lock);
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if (!list_empty(&res->l_debug_list))
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list_del_init(&res->l_debug_list);
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spin_unlock(&ocfs2_dlm_tracking_lock);
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}
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static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
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struct ocfs2_lock_res *res,
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enum ocfs2_lock_type type,
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u64 blkno,
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u32 generation,
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struct ocfs2_lock_res_ops *ops,
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void *priv)
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{
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ocfs2_build_lock_name(type, blkno, generation, res->l_name);
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res->l_type = type;
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res->l_ops = ops;
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res->l_priv = priv;
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res->l_level = LKM_IVMODE;
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res->l_requested = LKM_IVMODE;
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res->l_blocking = LKM_IVMODE;
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res->l_action = OCFS2_AST_INVALID;
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res->l_unlock_action = OCFS2_UNLOCK_INVALID;
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res->l_flags = OCFS2_LOCK_INITIALIZED;
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ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
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}
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void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
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{
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/* This also clears out the lock status block */
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memset(res, 0, sizeof(struct ocfs2_lock_res));
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spin_lock_init(&res->l_lock);
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init_waitqueue_head(&res->l_event);
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INIT_LIST_HEAD(&res->l_blocked_list);
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INIT_LIST_HEAD(&res->l_mask_waiters);
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}
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void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
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enum ocfs2_lock_type type,
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struct inode *inode)
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{
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struct ocfs2_lock_res_ops *ops;
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switch(type) {
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case OCFS2_LOCK_TYPE_RW:
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ops = &ocfs2_inode_rw_lops;
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break;
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case OCFS2_LOCK_TYPE_META:
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ops = &ocfs2_inode_meta_lops;
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break;
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case OCFS2_LOCK_TYPE_DATA:
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ops = &ocfs2_inode_data_lops;
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break;
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default:
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mlog_bug_on_msg(1, "type: %d\n", type);
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ops = NULL; /* thanks, gcc */
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break;
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};
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ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type,
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OCFS2_I(inode)->ip_blkno,
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inode->i_generation, ops, inode);
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}
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static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
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struct ocfs2_super *osb)
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{
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/* Superblock lockres doesn't come from a slab so we call init
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* once on it manually. */
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ocfs2_lock_res_init_once(res);
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ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
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OCFS2_SUPER_BLOCK_BLKNO, 0,
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&ocfs2_super_lops, osb);
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}
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static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
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struct ocfs2_super *osb)
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{
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/* Rename lockres doesn't come from a slab so we call init
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* once on it manually. */
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ocfs2_lock_res_init_once(res);
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ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 0, 0,
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&ocfs2_rename_lops, osb);
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}
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void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
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{
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mlog_entry_void();
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if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
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return;
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ocfs2_remove_lockres_tracking(res);
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mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
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"Lockres %s is on the blocked list\n",
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res->l_name);
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mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
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"Lockres %s has mask waiters pending\n",
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res->l_name);
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mlog_bug_on_msg(spin_is_locked(&res->l_lock),
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"Lockres %s is locked\n",
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res->l_name);
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mlog_bug_on_msg(res->l_ro_holders,
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"Lockres %s has %u ro holders\n",
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res->l_name, res->l_ro_holders);
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mlog_bug_on_msg(res->l_ex_holders,
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"Lockres %s has %u ex holders\n",
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res->l_name, res->l_ex_holders);
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/* Need to clear out the lock status block for the dlm */
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memset(&res->l_lksb, 0, sizeof(res->l_lksb));
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res->l_flags = 0UL;
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mlog_exit_void();
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}
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static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
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int level)
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{
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mlog_entry_void();
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BUG_ON(!lockres);
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switch(level) {
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case LKM_EXMODE:
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lockres->l_ex_holders++;
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break;
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case LKM_PRMODE:
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lockres->l_ro_holders++;
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break;
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default:
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BUG();
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}
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mlog_exit_void();
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}
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static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
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int level)
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{
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mlog_entry_void();
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BUG_ON(!lockres);
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switch(level) {
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case LKM_EXMODE:
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BUG_ON(!lockres->l_ex_holders);
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lockres->l_ex_holders--;
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break;
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case LKM_PRMODE:
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BUG_ON(!lockres->l_ro_holders);
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lockres->l_ro_holders--;
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break;
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default:
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BUG();
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}
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mlog_exit_void();
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}
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/* WARNING: This function lives in a world where the only three lock
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* levels are EX, PR, and NL. It *will* have to be adjusted when more
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* lock types are added. */
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static inline int ocfs2_highest_compat_lock_level(int level)
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{
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int new_level = LKM_EXMODE;
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if (level == LKM_EXMODE)
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new_level = LKM_NLMODE;
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else if (level == LKM_PRMODE)
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new_level = LKM_PRMODE;
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return new_level;
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}
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static void lockres_set_flags(struct ocfs2_lock_res *lockres,
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unsigned long newflags)
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{
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struct list_head *pos, *tmp;
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struct ocfs2_mask_waiter *mw;
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assert_spin_locked(&lockres->l_lock);
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lockres->l_flags = newflags;
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list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) {
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mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item);
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if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
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continue;
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list_del_init(&mw->mw_item);
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mw->mw_status = 0;
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complete(&mw->mw_complete);
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}
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}
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static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
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{
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lockres_set_flags(lockres, lockres->l_flags | or);
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}
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static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
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unsigned long clear)
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{
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lockres_set_flags(lockres, lockres->l_flags & ~clear);
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}
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|
|
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
|
|
{
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
|
BUG_ON(lockres->l_blocking <= LKM_NLMODE);
|
|
|
|
lockres->l_level = lockres->l_requested;
|
|
if (lockres->l_level <=
|
|
ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
|
|
lockres->l_blocking = LKM_NLMODE;
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
|
|
}
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
|
|
{
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
|
|
|
|
/* Convert from RO to EX doesn't really need anything as our
|
|
* information is already up to data. Convert from NL to
|
|
* *anything* however should mark ourselves as needing an
|
|
* update */
|
|
if (lockres->l_level == LKM_NLMODE)
|
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
|
|
lockres->l_level = lockres->l_requested;
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
|
|
{
|
|
mlog_entry_void();
|
|
|
|
BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY));
|
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
|
|
|
|
if (lockres->l_requested > LKM_NLMODE &&
|
|
!(lockres->l_flags & OCFS2_LOCK_LOCAL))
|
|
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
|
|
lockres->l_level = lockres->l_requested;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_inode_ast_func(void *opaque)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
struct inode *inode;
|
|
struct dlm_lockstatus *lksb;
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
|
|
mlog(0, "AST fired for inode %llu, l_action = %u, type = %s\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, lockres->l_action,
|
|
ocfs2_lock_type_string(lockres->l_type));
|
|
|
|
BUG_ON(!ocfs2_is_inode_lock(lockres));
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
lksb = &(lockres->l_lksb);
|
|
if (lksb->status != DLM_NORMAL) {
|
|
mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u "
|
|
"on inode %llu\n", lksb->status,
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
mlog_exit_void();
|
|
return;
|
|
}
|
|
|
|
switch(lockres->l_action) {
|
|
case OCFS2_AST_ATTACH:
|
|
ocfs2_generic_handle_attach_action(lockres);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
|
|
break;
|
|
case OCFS2_AST_CONVERT:
|
|
ocfs2_generic_handle_convert_action(lockres);
|
|
break;
|
|
case OCFS2_AST_DOWNCONVERT:
|
|
ocfs2_generic_handle_downconvert_action(lockres);
|
|
break;
|
|
default:
|
|
mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
|
|
"lockres flags = 0x%lx, unlock action: %u\n",
|
|
lockres->l_name, lockres->l_action, lockres->l_flags,
|
|
lockres->l_unlock_action);
|
|
|
|
BUG();
|
|
}
|
|
|
|
/* data and rw locking ignores refresh flag for now. */
|
|
if (lockres->l_type != OCFS2_LOCK_TYPE_META)
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
|
|
/* set it to something invalid so if we get called again we
|
|
* can catch it. */
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
wake_up(&lockres->l_event);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
int needs_downconvert = 0;
|
|
mlog_entry_void();
|
|
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
|
|
|
|
if (level > lockres->l_blocking) {
|
|
/* only schedule a downconvert if we haven't already scheduled
|
|
* one that goes low enough to satisfy the level we're
|
|
* blocking. this also catches the case where we get
|
|
* duplicate BASTs */
|
|
if (ocfs2_highest_compat_lock_level(level) <
|
|
ocfs2_highest_compat_lock_level(lockres->l_blocking))
|
|
needs_downconvert = 1;
|
|
|
|
lockres->l_blocking = level;
|
|
}
|
|
|
|
mlog_exit(needs_downconvert);
|
|
return needs_downconvert;
|
|
}
|
|
|
|
static void ocfs2_generic_bast_func(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
int needs_downconvert;
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(level <= LKM_NLMODE);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
|
|
if (needs_downconvert)
|
|
ocfs2_schedule_blocked_lock(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ocfs2_kick_vote_thread(osb);
|
|
|
|
wake_up(&lockres->l_event);
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_inode_bast_func(void *opaque, int level)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
struct inode *inode;
|
|
struct ocfs2_super *osb;
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(!ocfs2_is_inode_lock(lockres));
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
osb = OCFS2_SB(inode->i_sb);
|
|
|
|
mlog(0, "BAST fired for inode %llu, blocking %d, level %d type %s\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, level,
|
|
lockres->l_level, ocfs2_lock_type_string(lockres->l_type));
|
|
|
|
ocfs2_generic_bast_func(osb, lockres, level);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres,
|
|
int ignore_refresh)
|
|
{
|
|
struct dlm_lockstatus *lksb = &lockres->l_lksb;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
if (lksb->status != DLM_NORMAL) {
|
|
mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
|
|
lockres->l_name, lksb->status);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
return;
|
|
}
|
|
|
|
switch(lockres->l_action) {
|
|
case OCFS2_AST_ATTACH:
|
|
ocfs2_generic_handle_attach_action(lockres);
|
|
break;
|
|
case OCFS2_AST_CONVERT:
|
|
ocfs2_generic_handle_convert_action(lockres);
|
|
break;
|
|
case OCFS2_AST_DOWNCONVERT:
|
|
ocfs2_generic_handle_downconvert_action(lockres);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
if (ignore_refresh)
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
|
|
/* set it to something invalid so if we get called again we
|
|
* can catch it. */
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
}
|
|
|
|
static void ocfs2_super_ast_func(void *opaque)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
|
|
mlog_entry_void();
|
|
mlog(0, "Superblock AST fired\n");
|
|
|
|
BUG_ON(!ocfs2_is_super_lock(lockres));
|
|
ocfs2_generic_ast_func(lockres, 0);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_super_bast_func(void *opaque,
|
|
int level)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
struct ocfs2_super *osb;
|
|
|
|
mlog_entry_void();
|
|
mlog(0, "Superblock BAST fired\n");
|
|
|
|
BUG_ON(!ocfs2_is_super_lock(lockres));
|
|
osb = ocfs2_lock_res_super(lockres);
|
|
ocfs2_generic_bast_func(osb, lockres, level);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_rename_ast_func(void *opaque)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "Rename AST fired\n");
|
|
|
|
BUG_ON(!ocfs2_is_rename_lock(lockres));
|
|
|
|
ocfs2_generic_ast_func(lockres, 1);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_rename_bast_func(void *opaque,
|
|
int level)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
struct ocfs2_super *osb;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "Rename BAST fired\n");
|
|
|
|
BUG_ON(!ocfs2_is_rename_lock(lockres));
|
|
|
|
osb = ocfs2_lock_res_super(lockres);
|
|
ocfs2_generic_bast_func(osb, lockres, level);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
|
|
int convert)
|
|
{
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
if (convert)
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
else
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
mlog_exit_void();
|
|
}
|
|
|
|
/* Note: If we detect another process working on the lock (i.e.,
|
|
* OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
|
|
* to do the right thing in that case.
|
|
*/
|
|
static int ocfs2_lock_create(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level,
|
|
int dlm_flags)
|
|
{
|
|
int ret = 0;
|
|
enum dlm_status status;
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level,
|
|
dlm_flags);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
|
|
(lockres->l_flags & OCFS2_LOCK_BUSY)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto bail;
|
|
}
|
|
|
|
lockres->l_action = OCFS2_AST_ATTACH;
|
|
lockres->l_requested = level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
status = dlmlock(osb->dlm,
|
|
level,
|
|
&lockres->l_lksb,
|
|
dlm_flags,
|
|
lockres->l_name,
|
|
lockres->l_ops->ast,
|
|
lockres,
|
|
lockres->l_ops->bast);
|
|
if (status != DLM_NORMAL) {
|
|
ocfs2_log_dlm_error("dlmlock", status, lockres);
|
|
ret = -EINVAL;
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
}
|
|
|
|
mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
|
|
|
|
bail:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
|
|
int flag)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
ret = lockres->l_flags & flag;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
|
|
|
|
{
|
|
wait_event(lockres->l_event,
|
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
|
|
}
|
|
|
|
static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
|
|
|
|
{
|
|
wait_event(lockres->l_event,
|
|
!ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
|
|
}
|
|
|
|
/* predict what lock level we'll be dropping down to on behalf
|
|
* of another node, and return true if the currently wanted
|
|
* level will be compatible with it. */
|
|
static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
|
|
int wanted)
|
|
{
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
|
|
|
return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
|
}
|
|
|
|
static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
|
|
{
|
|
INIT_LIST_HEAD(&mw->mw_item);
|
|
init_completion(&mw->mw_complete);
|
|
}
|
|
|
|
static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
|
|
{
|
|
wait_for_completion(&mw->mw_complete);
|
|
/* Re-arm the completion in case we want to wait on it again */
|
|
INIT_COMPLETION(mw->mw_complete);
|
|
return mw->mw_status;
|
|
}
|
|
|
|
static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_mask_waiter *mw,
|
|
unsigned long mask,
|
|
unsigned long goal)
|
|
{
|
|
BUG_ON(!list_empty(&mw->mw_item));
|
|
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
|
|
mw->mw_mask = mask;
|
|
mw->mw_goal = goal;
|
|
}
|
|
|
|
/* returns 0 if the mw that was removed was already satisfied, -EBUSY
|
|
* if the mask still hadn't reached its goal */
|
|
static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_mask_waiter *mw)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (!list_empty(&mw->mw_item)) {
|
|
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
|
|
ret = -EBUSY;
|
|
|
|
list_del_init(&mw->mw_item);
|
|
init_completion(&mw->mw_complete);
|
|
}
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int ocfs2_cluster_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level,
|
|
int lkm_flags,
|
|
int arg_flags)
|
|
{
|
|
struct ocfs2_mask_waiter mw;
|
|
enum dlm_status status;
|
|
int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
|
|
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
again:
|
|
wait = 0;
|
|
|
|
if (catch_signals && signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
|
|
"Cluster lock called on freeing lockres %s! flags "
|
|
"0x%lx\n", lockres->l_name, lockres->l_flags);
|
|
|
|
/* We only compare against the currently granted level
|
|
* here. If the lock is blocked waiting on a downconvert,
|
|
* we'll get caught below. */
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY &&
|
|
level > lockres->l_level) {
|
|
/* is someone sitting in dlm_lock? If so, wait on
|
|
* them. */
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
|
|
wait = 1;
|
|
goto unlock;
|
|
}
|
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
|
/* lock has not been created yet. */
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
|
|
!ocfs2_may_continue_on_blocked_lock(lockres, level)) {
|
|
/* is the lock is currently blocked on behalf of
|
|
* another node */
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
|
|
wait = 1;
|
|
goto unlock;
|
|
}
|
|
|
|
if (level > lockres->l_level) {
|
|
if (lockres->l_action != OCFS2_AST_INVALID)
|
|
mlog(ML_ERROR, "lockres %s has action %u pending\n",
|
|
lockres->l_name, lockres->l_action);
|
|
|
|
lockres->l_action = OCFS2_AST_CONVERT;
|
|
lockres->l_requested = level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
BUG_ON(level == LKM_IVMODE);
|
|
BUG_ON(level == LKM_NLMODE);
|
|
|
|
mlog(0, "lock %s, convert from %d to level = %d\n",
|
|
lockres->l_name, lockres->l_level, level);
|
|
|
|
/* call dlm_lock to upgrade lock now */
|
|
status = dlmlock(osb->dlm,
|
|
level,
|
|
&lockres->l_lksb,
|
|
lkm_flags|LKM_CONVERT|LKM_VALBLK,
|
|
lockres->l_name,
|
|
lockres->l_ops->ast,
|
|
lockres,
|
|
lockres->l_ops->bast);
|
|
if (status != DLM_NORMAL) {
|
|
if ((lkm_flags & LKM_NOQUEUE) &&
|
|
(status == DLM_NOTQUEUED))
|
|
ret = -EAGAIN;
|
|
else {
|
|
ocfs2_log_dlm_error("dlmlock", status,
|
|
lockres);
|
|
ret = -EINVAL;
|
|
}
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
goto out;
|
|
}
|
|
|
|
mlog(0, "lock %s, successfull return from dlmlock\n",
|
|
lockres->l_name);
|
|
|
|
/* At this point we've gone inside the dlm and need to
|
|
* complete our work regardless. */
|
|
catch_signals = 0;
|
|
|
|
/* wait for busy to clear and carry on */
|
|
goto again;
|
|
}
|
|
|
|
/* Ok, if we get here then we're good to go. */
|
|
ocfs2_inc_holders(lockres, level);
|
|
|
|
ret = 0;
|
|
unlock:
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
out:
|
|
/*
|
|
* This is helping work around a lock inversion between the page lock
|
|
* and dlm locks. One path holds the page lock while calling aops
|
|
* which block acquiring dlm locks. The voting thread holds dlm
|
|
* locks while acquiring page locks while down converting data locks.
|
|
* This block is helping an aop path notice the inversion and back
|
|
* off to unlock its page lock before trying the dlm lock again.
|
|
*/
|
|
if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
|
|
mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
|
|
wait = 0;
|
|
if (lockres_remove_mask_waiter(lockres, &mw))
|
|
ret = -EAGAIN;
|
|
else
|
|
goto again;
|
|
}
|
|
if (wait) {
|
|
ret = ocfs2_wait_for_mask(&mw);
|
|
if (ret == 0)
|
|
goto again;
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int level)
|
|
{
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
ocfs2_dec_holders(lockres, level);
|
|
ocfs2_vote_on_unlock(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static int ocfs2_create_new_inode_lock(struct inode *inode,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
|
|
lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
return ocfs2_lock_create(osb, lockres, LKM_EXMODE, LKM_LOCAL);
|
|
}
|
|
|
|
/* Grants us an EX lock on the data and metadata resources, skipping
|
|
* the normal cluster directory lookup. Use this ONLY on newly created
|
|
* inodes which other nodes can't possibly see, and which haven't been
|
|
* hashed in the inode hash yet. This can give us a good performance
|
|
* increase as it'll skip the network broadcast normally associated
|
|
* with creating a new lock resource. */
|
|
int ocfs2_create_new_inode_locks(struct inode *inode)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(!inode);
|
|
BUG_ON(!ocfs2_inode_is_new(inode));
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
/* NOTE: That we don't increment any of the holder counts, nor
|
|
* do we add anything to a journal handle. Since this is
|
|
* supposed to be a new inode which the cluster doesn't know
|
|
* about yet, there is no need to. As far as the LVB handling
|
|
* is concerned, this is basically like acquiring an EX lock
|
|
* on a resource which has an invalid one -- we'll set it
|
|
* valid when we release the EX. */
|
|
|
|
ret = ocfs2_create_new_inode_lock(inode,
|
|
&OCFS2_I(inode)->ip_rw_lockres);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
ret = ocfs2_create_new_inode_lock(inode,
|
|
&OCFS2_I(inode)->ip_meta_lockres);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
ret = ocfs2_create_new_inode_lock(inode,
|
|
&OCFS2_I(inode)->ip_data_lockres);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
bail:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
int ocfs2_rw_lock(struct inode *inode, int write)
|
|
{
|
|
int status, level;
|
|
struct ocfs2_lock_res *lockres;
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "inode %llu take %s RW lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
lockres = &OCFS2_I(inode)->ip_rw_lockres;
|
|
|
|
level = write ? LKM_EXMODE : LKM_PRMODE;
|
|
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
|
|
0);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_rw_unlock(struct inode *inode, int write)
|
|
{
|
|
int level = write ? LKM_EXMODE : LKM_PRMODE;
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "inode %llu drop %s RW lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
int ocfs2_data_lock_full(struct inode *inode,
|
|
int write,
|
|
int arg_flags)
|
|
{
|
|
int status = 0, level;
|
|
struct ocfs2_lock_res *lockres;
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "inode %llu take %s DATA lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
/* We'll allow faking a readonly data lock for
|
|
* rodevices. */
|
|
if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
|
|
if (write) {
|
|
status = -EROFS;
|
|
mlog_errno(status);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
lockres = &OCFS2_I(inode)->ip_data_lockres;
|
|
|
|
level = write ? LKM_EXMODE : LKM_PRMODE;
|
|
|
|
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
|
|
0, arg_flags);
|
|
if (status < 0 && status != -EAGAIN)
|
|
mlog_errno(status);
|
|
|
|
out:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/* see ocfs2_meta_lock_with_page() */
|
|
int ocfs2_data_lock_with_page(struct inode *inode,
|
|
int write,
|
|
struct page *page)
|
|
{
|
|
int ret;
|
|
|
|
ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
|
|
if (ret == -EAGAIN) {
|
|
unlock_page(page);
|
|
if (ocfs2_data_lock(inode, write) == 0)
|
|
ocfs2_data_unlock(inode, write);
|
|
ret = AOP_TRUNCATED_PAGE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int kick = 0;
|
|
|
|
mlog_entry_void();
|
|
|
|
/* If we know that another node is waiting on our lock, kick
|
|
* the vote thread * pre-emptively when we reach a release
|
|
* condition. */
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
|
|
switch(lockres->l_blocking) {
|
|
case LKM_EXMODE:
|
|
if (!lockres->l_ex_holders && !lockres->l_ro_holders)
|
|
kick = 1;
|
|
break;
|
|
case LKM_PRMODE:
|
|
if (!lockres->l_ex_holders)
|
|
kick = 1;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
if (kick)
|
|
ocfs2_kick_vote_thread(osb);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
void ocfs2_data_unlock(struct inode *inode,
|
|
int write)
|
|
{
|
|
int level = write ? LKM_EXMODE : LKM_PRMODE;
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "inode %llu drop %s DATA lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
write ? "EXMODE" : "PRMODE");
|
|
|
|
if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
#define OCFS2_SEC_BITS 34
|
|
#define OCFS2_SEC_SHIFT (64 - 34)
|
|
#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
|
|
|
|
/* LVB only has room for 64 bits of time here so we pack it for
|
|
* now. */
|
|
static u64 ocfs2_pack_timespec(struct timespec *spec)
|
|
{
|
|
u64 res;
|
|
u64 sec = spec->tv_sec;
|
|
u32 nsec = spec->tv_nsec;
|
|
|
|
res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Call this with the lockres locked. I am reasonably sure we don't
|
|
* need ip_lock in this function as anyone who would be changing those
|
|
* values is supposed to be blocked in ocfs2_meta_lock right now. */
|
|
static void __ocfs2_stuff_meta_lvb(struct inode *inode)
|
|
{
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
|
|
struct ocfs2_meta_lvb *lvb;
|
|
|
|
mlog_entry_void();
|
|
|
|
lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
|
|
|
lvb->lvb_version = cpu_to_be32(OCFS2_LVB_VERSION);
|
|
lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
|
|
lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
|
|
lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
|
|
lvb->lvb_igid = cpu_to_be32(inode->i_gid);
|
|
lvb->lvb_imode = cpu_to_be16(inode->i_mode);
|
|
lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
|
|
lvb->lvb_iatime_packed =
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
|
|
lvb->lvb_ictime_packed =
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
|
|
lvb->lvb_imtime_packed =
|
|
cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
|
|
|
|
mlog_meta_lvb(0, lockres);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_unpack_timespec(struct timespec *spec,
|
|
u64 packed_time)
|
|
{
|
|
spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
|
|
spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
|
|
}
|
|
|
|
static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
|
|
{
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
|
|
struct ocfs2_meta_lvb *lvb;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog_meta_lvb(0, lockres);
|
|
|
|
lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
|
|
|
/* We're safe here without the lockres lock... */
|
|
spin_lock(&oi->ip_lock);
|
|
oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
|
|
i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
|
|
|
|
/* fast-symlinks are a special case */
|
|
if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
|
|
inode->i_blocks = 0;
|
|
else
|
|
inode->i_blocks =
|
|
ocfs2_align_bytes_to_sectors(i_size_read(inode));
|
|
|
|
inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
|
|
inode->i_gid = be32_to_cpu(lvb->lvb_igid);
|
|
inode->i_mode = be16_to_cpu(lvb->lvb_imode);
|
|
inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
|
|
ocfs2_unpack_timespec(&inode->i_atime,
|
|
be64_to_cpu(lvb->lvb_iatime_packed));
|
|
ocfs2_unpack_timespec(&inode->i_mtime,
|
|
be64_to_cpu(lvb->lvb_imtime_packed));
|
|
ocfs2_unpack_timespec(&inode->i_ctime,
|
|
be64_to_cpu(lvb->lvb_ictime_packed));
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static inline int ocfs2_meta_lvb_is_trustable(struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
|
|
|
if (be32_to_cpu(lvb->lvb_version) == OCFS2_LVB_VERSION)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Determine whether a lock resource needs to be refreshed, and
|
|
* arbitrate who gets to refresh it.
|
|
*
|
|
* 0 means no refresh needed.
|
|
*
|
|
* > 0 means you need to refresh this and you MUST call
|
|
* ocfs2_complete_lock_res_refresh afterwards. */
|
|
static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
|
|
{
|
|
unsigned long flags;
|
|
int status = 0;
|
|
|
|
mlog_entry_void();
|
|
|
|
refresh_check:
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto bail;
|
|
}
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
ocfs2_wait_on_refreshing_lock(lockres);
|
|
goto refresh_check;
|
|
}
|
|
|
|
/* Ok, I'll be the one to refresh this lock. */
|
|
lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
status = 1;
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/* If status is non zero, I'll mark it as not being in refresh
|
|
* anymroe, but i won't clear the needs refresh flag. */
|
|
static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
|
|
int status)
|
|
{
|
|
unsigned long flags;
|
|
mlog_entry_void();
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
|
|
if (!status)
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
/* may or may not return a bh if it went to disk. */
|
|
static int ocfs2_meta_lock_update(struct inode *inode,
|
|
struct buffer_head **bh)
|
|
{
|
|
int status = 0;
|
|
struct ocfs2_inode_info *oi = OCFS2_I(inode);
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_dinode *fe;
|
|
|
|
mlog_entry_void();
|
|
|
|
spin_lock(&oi->ip_lock);
|
|
if (oi->ip_flags & OCFS2_INODE_DELETED) {
|
|
mlog(0, "Orphaned inode %llu was deleted while we "
|
|
"were waiting on a lock. ip_flags = 0x%x\n",
|
|
(unsigned long long)oi->ip_blkno, oi->ip_flags);
|
|
spin_unlock(&oi->ip_lock);
|
|
status = -ENOENT;
|
|
goto bail;
|
|
}
|
|
spin_unlock(&oi->ip_lock);
|
|
|
|
lockres = &oi->ip_meta_lockres;
|
|
|
|
if (!ocfs2_should_refresh_lock_res(lockres))
|
|
goto bail;
|
|
|
|
/* This will discard any caching information we might have had
|
|
* for the inode metadata. */
|
|
ocfs2_metadata_cache_purge(inode);
|
|
|
|
/* will do nothing for inode types that don't use the extent
|
|
* map (directories, bitmap files, etc) */
|
|
ocfs2_extent_map_trunc(inode, 0);
|
|
|
|
if (ocfs2_meta_lvb_is_trustable(lockres)) {
|
|
mlog(0, "Trusting LVB on inode %llu\n",
|
|
(unsigned long long)oi->ip_blkno);
|
|
ocfs2_refresh_inode_from_lvb(inode);
|
|
} else {
|
|
/* Boo, we have to go to disk. */
|
|
/* read bh, cast, ocfs2_refresh_inode */
|
|
status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
|
|
bh, OCFS2_BH_CACHED, inode);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail_refresh;
|
|
}
|
|
fe = (struct ocfs2_dinode *) (*bh)->b_data;
|
|
|
|
/* This is a good chance to make sure we're not
|
|
* locking an invalid object.
|
|
*
|
|
* We bug on a stale inode here because we checked
|
|
* above whether it was wiped from disk. The wiping
|
|
* node provides a guarantee that we receive that
|
|
* message and can mark the inode before dropping any
|
|
* locks associated with it. */
|
|
if (!OCFS2_IS_VALID_DINODE(fe)) {
|
|
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
|
|
status = -EIO;
|
|
goto bail_refresh;
|
|
}
|
|
mlog_bug_on_msg(inode->i_generation !=
|
|
le32_to_cpu(fe->i_generation),
|
|
"Invalid dinode %llu disk generation: %u "
|
|
"inode->i_generation: %u\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
le32_to_cpu(fe->i_generation),
|
|
inode->i_generation);
|
|
mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
|
|
!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
|
|
"Stale dinode %llu dtime: %llu flags: 0x%x\n",
|
|
(unsigned long long)oi->ip_blkno,
|
|
(unsigned long long)le64_to_cpu(fe->i_dtime),
|
|
le32_to_cpu(fe->i_flags));
|
|
|
|
ocfs2_refresh_inode(inode, fe);
|
|
}
|
|
|
|
status = 0;
|
|
bail_refresh:
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_assign_bh(struct inode *inode,
|
|
struct buffer_head **ret_bh,
|
|
struct buffer_head *passed_bh)
|
|
{
|
|
int status;
|
|
|
|
if (passed_bh) {
|
|
/* Ok, the update went to disk for us, use the
|
|
* returned bh. */
|
|
*ret_bh = passed_bh;
|
|
get_bh(*ret_bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
|
|
OCFS2_I(inode)->ip_blkno,
|
|
ret_bh,
|
|
OCFS2_BH_CACHED,
|
|
inode);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* returns < 0 error if the callback will never be called, otherwise
|
|
* the result of the lock will be communicated via the callback.
|
|
*/
|
|
int ocfs2_meta_lock_full(struct inode *inode,
|
|
struct ocfs2_journal_handle *handle,
|
|
struct buffer_head **ret_bh,
|
|
int ex,
|
|
int arg_flags)
|
|
{
|
|
int status, level, dlm_flags, acquired;
|
|
struct ocfs2_lock_res *lockres;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct buffer_head *local_bh = NULL;
|
|
|
|
BUG_ON(!inode);
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "inode %llu, take %s META lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
ex ? "EXMODE" : "PRMODE");
|
|
|
|
status = 0;
|
|
acquired = 0;
|
|
/* We'll allow faking a readonly metadata lock for
|
|
* rodevices. */
|
|
if (ocfs2_is_hard_readonly(osb)) {
|
|
if (ex)
|
|
status = -EROFS;
|
|
goto bail;
|
|
}
|
|
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
|
|
wait_event(osb->recovery_event,
|
|
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
|
|
|
|
acquired = 0;
|
|
lockres = &OCFS2_I(inode)->ip_meta_lockres;
|
|
level = ex ? LKM_EXMODE : LKM_PRMODE;
|
|
dlm_flags = 0;
|
|
if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
|
|
dlm_flags |= LKM_NOQUEUE;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
|
|
if (status < 0) {
|
|
if (status != -EAGAIN && status != -EIOCBRETRY)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* Notify the error cleanup path to drop the cluster lock. */
|
|
acquired = 1;
|
|
|
|
/* We wait twice because a node may have died while we were in
|
|
* the lower dlm layers. The second time though, we've
|
|
* committed to owning this lock so we don't allow signals to
|
|
* abort the operation. */
|
|
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
|
|
wait_event(osb->recovery_event,
|
|
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
|
|
|
|
/* This is fun. The caller may want a bh back, or it may
|
|
* not. ocfs2_meta_lock_update definitely wants one in, but
|
|
* may or may not read one, depending on what's in the
|
|
* LVB. The result of all of this is that we've *only* gone to
|
|
* disk if we have to, so the complexity is worthwhile. */
|
|
status = ocfs2_meta_lock_update(inode, &local_bh);
|
|
if (status < 0) {
|
|
if (status != -ENOENT)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (ret_bh) {
|
|
status = ocfs2_assign_bh(inode, ret_bh, local_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
|
|
if (handle) {
|
|
status = ocfs2_handle_add_lock(handle, inode);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
}
|
|
|
|
bail:
|
|
if (status < 0) {
|
|
if (ret_bh && (*ret_bh)) {
|
|
brelse(*ret_bh);
|
|
*ret_bh = NULL;
|
|
}
|
|
if (acquired)
|
|
ocfs2_meta_unlock(inode, ex);
|
|
}
|
|
|
|
if (local_bh)
|
|
brelse(local_bh);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* This is working around a lock inversion between tasks acquiring DLM locks
|
|
* while holding a page lock and the vote thread which blocks dlm lock acquiry
|
|
* while acquiring page locks.
|
|
*
|
|
* ** These _with_page variantes are only intended to be called from aop
|
|
* methods that hold page locks and return a very specific *positive* error
|
|
* code that aop methods pass up to the VFS -- test for errors with != 0. **
|
|
*
|
|
* The DLM is called such that it returns -EAGAIN if it would have blocked
|
|
* waiting for the vote thread. In that case we unlock our page so the vote
|
|
* thread can make progress. Once we've done this we have to return
|
|
* AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up
|
|
* into the VFS who will then immediately retry the aop call.
|
|
*
|
|
* We do a blocking lock and immediate unlock before returning, though, so that
|
|
* the lock has a great chance of being cached on this node by the time the VFS
|
|
* calls back to retry the aop. This has a potential to livelock as nodes
|
|
* ping locks back and forth, but that's a risk we're willing to take to avoid
|
|
* the lock inversion simply.
|
|
*/
|
|
int ocfs2_meta_lock_with_page(struct inode *inode,
|
|
struct ocfs2_journal_handle *handle,
|
|
struct buffer_head **ret_bh,
|
|
int ex,
|
|
struct page *page)
|
|
{
|
|
int ret;
|
|
|
|
ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex,
|
|
OCFS2_LOCK_NONBLOCK);
|
|
if (ret == -EAGAIN) {
|
|
unlock_page(page);
|
|
if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0)
|
|
ocfs2_meta_unlock(inode, ex);
|
|
ret = AOP_TRUNCATED_PAGE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ocfs2_meta_unlock(struct inode *inode,
|
|
int ex)
|
|
{
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "inode %llu drop %s META lock\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
ex ? "EXMODE" : "PRMODE");
|
|
|
|
if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
|
|
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
int ocfs2_super_lock(struct ocfs2_super *osb,
|
|
int ex)
|
|
{
|
|
int status;
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
|
|
struct buffer_head *bh;
|
|
struct ocfs2_slot_info *si = osb->slot_info;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* The super block lock path is really in the best position to
|
|
* know when resources covered by the lock need to be
|
|
* refreshed, so we do it here. Of course, making sense of
|
|
* everything is up to the caller :) */
|
|
status = ocfs2_should_refresh_lock_res(lockres);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
if (status) {
|
|
bh = si->si_bh;
|
|
status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0,
|
|
si->si_inode);
|
|
if (status == 0)
|
|
ocfs2_update_slot_info(si);
|
|
|
|
ocfs2_complete_lock_res_refresh(lockres, status);
|
|
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
}
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_super_unlock(struct ocfs2_super *osb,
|
|
int ex)
|
|
{
|
|
int level = ex ? LKM_EXMODE : LKM_PRMODE;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
|
|
|
|
ocfs2_cluster_unlock(osb, lockres, level);
|
|
}
|
|
|
|
int ocfs2_rename_lock(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
|
|
|
|
if (ocfs2_is_hard_readonly(osb))
|
|
return -EROFS;
|
|
|
|
status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_rename_unlock(struct ocfs2_super *osb)
|
|
{
|
|
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
|
|
|
|
ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
|
|
}
|
|
|
|
/* Reference counting of the dlm debug structure. We want this because
|
|
* open references on the debug inodes can live on after a mount, so
|
|
* we can't rely on the ocfs2_super to always exist. */
|
|
static void ocfs2_dlm_debug_free(struct kref *kref)
|
|
{
|
|
struct ocfs2_dlm_debug *dlm_debug;
|
|
|
|
dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
|
|
|
|
kfree(dlm_debug);
|
|
}
|
|
|
|
void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
|
|
{
|
|
if (dlm_debug)
|
|
kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
|
|
}
|
|
|
|
static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
|
|
{
|
|
kref_get(&debug->d_refcnt);
|
|
}
|
|
|
|
struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
|
|
{
|
|
struct ocfs2_dlm_debug *dlm_debug;
|
|
|
|
dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
|
|
if (!dlm_debug) {
|
|
mlog_errno(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
kref_init(&dlm_debug->d_refcnt);
|
|
INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
|
|
dlm_debug->d_locking_state = NULL;
|
|
out:
|
|
return dlm_debug;
|
|
}
|
|
|
|
/* Access to this is arbitrated for us via seq_file->sem. */
|
|
struct ocfs2_dlm_seq_priv {
|
|
struct ocfs2_dlm_debug *p_dlm_debug;
|
|
struct ocfs2_lock_res p_iter_res;
|
|
struct ocfs2_lock_res p_tmp_res;
|
|
};
|
|
|
|
static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
|
|
struct ocfs2_dlm_seq_priv *priv)
|
|
{
|
|
struct ocfs2_lock_res *iter, *ret = NULL;
|
|
struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
|
|
|
|
assert_spin_locked(&ocfs2_dlm_tracking_lock);
|
|
|
|
list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
|
|
/* discover the head of the list */
|
|
if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
|
|
mlog(0, "End of list found, %p\n", ret);
|
|
break;
|
|
}
|
|
|
|
/* We track our "dummy" iteration lockres' by a NULL
|
|
* l_ops field. */
|
|
if (iter->l_ops != NULL) {
|
|
ret = iter;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
struct ocfs2_dlm_seq_priv *priv = m->private;
|
|
struct ocfs2_lock_res *iter;
|
|
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
|
iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
|
|
if (iter) {
|
|
/* Since lockres' have the lifetime of their container
|
|
* (which can be inodes, ocfs2_supers, etc) we want to
|
|
* copy this out to a temporary lockres while still
|
|
* under the spinlock. Obviously after this we can't
|
|
* trust any pointers on the copy returned, but that's
|
|
* ok as the information we want isn't typically held
|
|
* in them. */
|
|
priv->p_tmp_res = *iter;
|
|
iter = &priv->p_tmp_res;
|
|
}
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
|
|
|
return iter;
|
|
}
|
|
|
|
static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
struct ocfs2_dlm_seq_priv *priv = m->private;
|
|
struct ocfs2_lock_res *iter = v;
|
|
struct ocfs2_lock_res *dummy = &priv->p_iter_res;
|
|
|
|
spin_lock(&ocfs2_dlm_tracking_lock);
|
|
iter = ocfs2_dlm_next_res(iter, priv);
|
|
list_del_init(&dummy->l_debug_list);
|
|
if (iter) {
|
|
list_add(&dummy->l_debug_list, &iter->l_debug_list);
|
|
priv->p_tmp_res = *iter;
|
|
iter = &priv->p_tmp_res;
|
|
}
|
|
spin_unlock(&ocfs2_dlm_tracking_lock);
|
|
|
|
return iter;
|
|
}
|
|
|
|
/* So that debugfs.ocfs2 can determine which format is being used */
|
|
#define OCFS2_DLM_DEBUG_STR_VERSION 1
|
|
static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
char *lvb;
|
|
struct ocfs2_lock_res *lockres = v;
|
|
|
|
if (!lockres)
|
|
return -EINVAL;
|
|
|
|
seq_printf(m, "0x%x\t"
|
|
"%.*s\t"
|
|
"%d\t"
|
|
"0x%lx\t"
|
|
"0x%x\t"
|
|
"0x%x\t"
|
|
"%u\t"
|
|
"%u\t"
|
|
"%d\t"
|
|
"%d\t",
|
|
OCFS2_DLM_DEBUG_STR_VERSION,
|
|
OCFS2_LOCK_ID_MAX_LEN, lockres->l_name,
|
|
lockres->l_level,
|
|
lockres->l_flags,
|
|
lockres->l_action,
|
|
lockres->l_unlock_action,
|
|
lockres->l_ro_holders,
|
|
lockres->l_ex_holders,
|
|
lockres->l_requested,
|
|
lockres->l_blocking);
|
|
|
|
/* Dump the raw LVB */
|
|
lvb = lockres->l_lksb.lvb;
|
|
for(i = 0; i < DLM_LVB_LEN; i++)
|
|
seq_printf(m, "0x%x\t", lvb[i]);
|
|
|
|
/* End the line */
|
|
seq_printf(m, "\n");
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations ocfs2_dlm_seq_ops = {
|
|
.start = ocfs2_dlm_seq_start,
|
|
.stop = ocfs2_dlm_seq_stop,
|
|
.next = ocfs2_dlm_seq_next,
|
|
.show = ocfs2_dlm_seq_show,
|
|
};
|
|
|
|
static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = (struct seq_file *) file->private_data;
|
|
struct ocfs2_dlm_seq_priv *priv = seq->private;
|
|
struct ocfs2_lock_res *res = &priv->p_iter_res;
|
|
|
|
ocfs2_remove_lockres_tracking(res);
|
|
ocfs2_put_dlm_debug(priv->p_dlm_debug);
|
|
return seq_release_private(inode, file);
|
|
}
|
|
|
|
static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret;
|
|
struct ocfs2_dlm_seq_priv *priv;
|
|
struct seq_file *seq;
|
|
struct ocfs2_super *osb;
|
|
|
|
priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
osb = (struct ocfs2_super *) inode->u.generic_ip;
|
|
ocfs2_get_dlm_debug(osb->osb_dlm_debug);
|
|
priv->p_dlm_debug = osb->osb_dlm_debug;
|
|
INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
|
|
|
|
ret = seq_open(file, &ocfs2_dlm_seq_ops);
|
|
if (ret) {
|
|
kfree(priv);
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
seq = (struct seq_file *) file->private_data;
|
|
seq->private = priv;
|
|
|
|
ocfs2_add_lockres_tracking(&priv->p_iter_res,
|
|
priv->p_dlm_debug);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static struct file_operations ocfs2_dlm_debug_fops = {
|
|
.open = ocfs2_dlm_debug_open,
|
|
.release = ocfs2_dlm_debug_release,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
};
|
|
|
|
static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
|
|
{
|
|
int ret = 0;
|
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
|
|
|
|
dlm_debug->d_locking_state = debugfs_create_file("locking_state",
|
|
S_IFREG|S_IRUSR,
|
|
osb->osb_debug_root,
|
|
osb,
|
|
&ocfs2_dlm_debug_fops);
|
|
if (!dlm_debug->d_locking_state) {
|
|
ret = -EINVAL;
|
|
mlog(ML_ERROR,
|
|
"Unable to create locking state debugfs file.\n");
|
|
goto out;
|
|
}
|
|
|
|
ocfs2_get_dlm_debug(dlm_debug);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
|
|
{
|
|
struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
|
|
|
|
if (dlm_debug) {
|
|
debugfs_remove(dlm_debug->d_locking_state);
|
|
ocfs2_put_dlm_debug(dlm_debug);
|
|
}
|
|
}
|
|
|
|
int ocfs2_dlm_init(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
u32 dlm_key;
|
|
struct dlm_ctxt *dlm;
|
|
|
|
mlog_entry_void();
|
|
|
|
status = ocfs2_dlm_init_debug(osb);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* launch vote thread */
|
|
osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote-%d",
|
|
osb->osb_id);
|
|
if (IS_ERR(osb->vote_task)) {
|
|
status = PTR_ERR(osb->vote_task);
|
|
osb->vote_task = NULL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/* used by the dlm code to make message headers unique, each
|
|
* node in this domain must agree on this. */
|
|
dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
|
|
|
|
/* for now, uuid == domain */
|
|
dlm = dlm_register_domain(osb->uuid_str, dlm_key);
|
|
if (IS_ERR(dlm)) {
|
|
status = PTR_ERR(dlm);
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
|
|
ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
|
|
|
|
dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
|
|
|
|
osb->dlm = dlm;
|
|
|
|
status = 0;
|
|
bail:
|
|
if (status < 0) {
|
|
ocfs2_dlm_shutdown_debug(osb);
|
|
if (osb->vote_task)
|
|
kthread_stop(osb->vote_task);
|
|
}
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
|
|
{
|
|
mlog_entry_void();
|
|
|
|
dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
|
|
|
|
ocfs2_drop_osb_locks(osb);
|
|
|
|
if (osb->vote_task) {
|
|
kthread_stop(osb->vote_task);
|
|
osb->vote_task = NULL;
|
|
}
|
|
|
|
ocfs2_lock_res_free(&osb->osb_super_lockres);
|
|
ocfs2_lock_res_free(&osb->osb_rename_lockres);
|
|
|
|
dlm_unregister_domain(osb->dlm);
|
|
osb->dlm = NULL;
|
|
|
|
ocfs2_dlm_shutdown_debug(osb);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status)
|
|
{
|
|
struct ocfs2_lock_res *lockres = opaque;
|
|
unsigned long flags;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name,
|
|
lockres->l_unlock_action);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
/* We tried to cancel a convert request, but it was already
|
|
* granted. All we want to do here is clear our unlock
|
|
* state. The wake_up call done at the bottom is redundant
|
|
* (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
|
|
* hurt anything anyway */
|
|
if (status == DLM_CANCELGRANT &&
|
|
lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
|
|
mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
|
|
|
|
/* We don't clear the busy flag in this case as it
|
|
* should have been cleared by the ast which the dlm
|
|
* has called. */
|
|
goto complete_unlock;
|
|
}
|
|
|
|
if (status != DLM_NORMAL) {
|
|
mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
|
|
"unlock_action %d\n", status, lockres->l_name,
|
|
lockres->l_unlock_action);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
return;
|
|
}
|
|
|
|
switch(lockres->l_unlock_action) {
|
|
case OCFS2_UNLOCK_CANCEL_CONVERT:
|
|
mlog(0, "Cancel convert success for %s\n", lockres->l_name);
|
|
lockres->l_action = OCFS2_AST_INVALID;
|
|
break;
|
|
case OCFS2_UNLOCK_DROP_LOCK:
|
|
lockres->l_level = LKM_IVMODE;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
|
|
complete_unlock:
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
wake_up(&lockres->l_event);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *);
|
|
|
|
struct drop_lock_cb {
|
|
ocfs2_pre_drop_cb_t *drop_func;
|
|
void *drop_data;
|
|
};
|
|
|
|
static int ocfs2_drop_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
struct drop_lock_cb *dcb)
|
|
{
|
|
enum dlm_status status;
|
|
unsigned long flags;
|
|
|
|
/* We didn't get anywhere near actually using this lockres. */
|
|
if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
|
|
"lockres %s, flags 0x%lx\n",
|
|
lockres->l_name, lockres->l_flags);
|
|
|
|
while (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
|
mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
|
|
"%u, unlock_action = %u\n",
|
|
lockres->l_name, lockres->l_flags, lockres->l_action,
|
|
lockres->l_unlock_action);
|
|
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
/* XXX: Today we just wait on any busy
|
|
* locks... Perhaps we need to cancel converts in the
|
|
* future? */
|
|
ocfs2_wait_on_busy_lock(lockres);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
}
|
|
|
|
if (dcb)
|
|
dcb->drop_func(lockres, dcb->drop_data);
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY)
|
|
mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
|
|
lockres->l_name);
|
|
if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
|
|
mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
|
|
|
|
if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
goto out;
|
|
}
|
|
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
|
|
|
|
/* make sure we never get here while waiting for an ast to
|
|
* fire. */
|
|
BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
|
|
|
|
/* is this necessary? */
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
|
|
|
status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK,
|
|
lockres->l_ops->unlock_ast, lockres);
|
|
if (status != DLM_NORMAL) {
|
|
ocfs2_log_dlm_error("dlmunlock", status, lockres);
|
|
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
|
|
dlm_print_one_lock(lockres->l_lksb.lockid);
|
|
BUG();
|
|
}
|
|
mlog(0, "lock %s, successfull return from dlmunlock\n",
|
|
lockres->l_name);
|
|
|
|
ocfs2_wait_on_busy_lock(lockres);
|
|
out:
|
|
mlog_exit(0);
|
|
return 0;
|
|
}
|
|
|
|
/* Mark the lockres as being dropped. It will no longer be
|
|
* queued if blocking, but we still may have to wait on it
|
|
* being dequeued from the vote thread before we can consider
|
|
* it safe to drop.
|
|
*
|
|
* You can *not* attempt to call cluster_lock on this lockres anymore. */
|
|
void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
|
|
{
|
|
int status;
|
|
struct ocfs2_mask_waiter mw;
|
|
unsigned long flags;
|
|
|
|
ocfs2_init_mask_waiter(&mw);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
lockres->l_flags |= OCFS2_LOCK_FREEING;
|
|
while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
|
|
lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
mlog(0, "Waiting on lockres %s\n", lockres->l_name);
|
|
|
|
status = ocfs2_wait_for_mask(&mw);
|
|
if (status)
|
|
mlog_errno(status);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
}
|
|
|
|
static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
|
|
{
|
|
int status;
|
|
|
|
mlog_entry_void();
|
|
|
|
ocfs2_mark_lockres_freeing(&osb->osb_super_lockres);
|
|
|
|
status = ocfs2_drop_lock(osb, &osb->osb_super_lockres, NULL);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
ocfs2_mark_lockres_freeing(&osb->osb_rename_lockres);
|
|
|
|
status = ocfs2_drop_lock(osb, &osb->osb_rename_lockres, NULL);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
mlog_exit(status);
|
|
}
|
|
|
|
static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data)
|
|
{
|
|
struct inode *inode = data;
|
|
|
|
/* the metadata lock requires a bit more work as we have an
|
|
* LVB to worry about. */
|
|
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
|
|
lockres->l_level == LKM_EXMODE &&
|
|
!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
|
|
__ocfs2_stuff_meta_lvb(inode);
|
|
}
|
|
|
|
int ocfs2_drop_inode_locks(struct inode *inode)
|
|
{
|
|
int status, err;
|
|
struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, };
|
|
|
|
mlog_entry_void();
|
|
|
|
/* No need to call ocfs2_mark_lockres_freeing here -
|
|
* ocfs2_clear_inode has done it for us. */
|
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
|
&OCFS2_I(inode)->ip_data_lockres,
|
|
NULL);
|
|
if (err < 0)
|
|
mlog_errno(err);
|
|
|
|
status = err;
|
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
|
&OCFS2_I(inode)->ip_meta_lockres,
|
|
&meta_dcb);
|
|
if (err < 0)
|
|
mlog_errno(err);
|
|
if (err < 0 && !status)
|
|
status = err;
|
|
|
|
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
|
|
&OCFS2_I(inode)->ip_rw_lockres,
|
|
NULL);
|
|
if (err < 0)
|
|
mlog_errno(err);
|
|
if (err < 0 && !status)
|
|
status = err;
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
|
|
int new_level)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
BUG_ON(lockres->l_blocking <= LKM_NLMODE);
|
|
|
|
if (lockres->l_level <= new_level) {
|
|
mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n",
|
|
lockres->l_level, new_level);
|
|
BUG();
|
|
}
|
|
|
|
mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
|
|
lockres->l_name, new_level, lockres->l_blocking);
|
|
|
|
lockres->l_action = OCFS2_AST_DOWNCONVERT;
|
|
lockres->l_requested = new_level;
|
|
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
|
|
}
|
|
|
|
static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int new_level,
|
|
int lvb)
|
|
{
|
|
int ret, dlm_flags = LKM_CONVERT;
|
|
enum dlm_status status;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (lvb)
|
|
dlm_flags |= LKM_VALBLK;
|
|
|
|
status = dlmlock(osb->dlm,
|
|
new_level,
|
|
&lockres->l_lksb,
|
|
dlm_flags,
|
|
lockres->l_name,
|
|
lockres->l_ops->ast,
|
|
lockres,
|
|
lockres->l_ops->bast);
|
|
if (status != DLM_NORMAL) {
|
|
ocfs2_log_dlm_error("dlmlock", status, lockres);
|
|
ret = -EINVAL;
|
|
ocfs2_recover_from_dlm_error(lockres, 1);
|
|
goto bail;
|
|
}
|
|
|
|
ret = 0;
|
|
bail:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
/* returns 1 when the caller should unlock and call dlmunlock */
|
|
static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
mlog_entry_void();
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
|
|
|
if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
|
|
/* If we're already trying to cancel a lock conversion
|
|
* then just drop the spinlock and allow the caller to
|
|
* requeue this lock. */
|
|
|
|
mlog(0, "Lockres %s, skip convert\n", lockres->l_name);
|
|
return 0;
|
|
}
|
|
|
|
/* were we in a convert when we got the bast fire? */
|
|
BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
|
|
lockres->l_action != OCFS2_AST_DOWNCONVERT);
|
|
/* set things up for the unlockast to know to just
|
|
* clear out the ast_action and unset busy, etc. */
|
|
lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
|
|
|
|
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
|
|
"lock %s, invalid flags: 0x%lx\n",
|
|
lockres->l_name, lockres->l_flags);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ocfs2_cancel_convert(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int ret;
|
|
enum dlm_status status;
|
|
|
|
mlog_entry_void();
|
|
mlog(0, "lock %s\n", lockres->l_name);
|
|
|
|
ret = 0;
|
|
status = dlmunlock(osb->dlm,
|
|
&lockres->l_lksb,
|
|
LKM_CANCEL,
|
|
lockres->l_ops->unlock_ast,
|
|
lockres);
|
|
if (status != DLM_NORMAL) {
|
|
ocfs2_log_dlm_error("dlmunlock", status, lockres);
|
|
ret = -EINVAL;
|
|
ocfs2_recover_from_dlm_error(lockres, 0);
|
|
}
|
|
|
|
mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
|
|
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
|
|
struct ocfs2_lock_res *lockres,
|
|
int new_level)
|
|
{
|
|
int ret;
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
|
|
ret = 0;
|
|
mlog(0, "lockres %s currently being refreshed -- backing "
|
|
"off!\n", lockres->l_name);
|
|
} else if (new_level == LKM_PRMODE)
|
|
ret = !lockres->l_ex_holders &&
|
|
ocfs2_inode_fully_checkpointed(inode);
|
|
else /* Must be NLMODE we're converting to. */
|
|
ret = !lockres->l_ro_holders && !lockres->l_ex_holders &&
|
|
ocfs2_inode_fully_checkpointed(inode);
|
|
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_do_unblock_meta(struct inode *inode,
|
|
int *requeue)
|
|
{
|
|
int new_level;
|
|
int set_lvb = 0;
|
|
int ret = 0;
|
|
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
|
|
unsigned long flags;
|
|
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
mlog_entry_void();
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
|
|
|
mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level,
|
|
lockres->l_blocking);
|
|
|
|
BUG_ON(lockres->l_level != LKM_EXMODE &&
|
|
lockres->l_level != LKM_PRMODE);
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
|
*requeue = 1;
|
|
ret = ocfs2_prepare_cancel_convert(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
if (ret) {
|
|
ret = ocfs2_cancel_convert(osb, lockres);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
}
|
|
goto leave;
|
|
}
|
|
|
|
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
|
|
|
mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n",
|
|
lockres->l_level, lockres->l_blocking, new_level);
|
|
|
|
if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) {
|
|
if (lockres->l_level == LKM_EXMODE)
|
|
set_lvb = 1;
|
|
|
|
/* If the lock hasn't been refreshed yet (rare), then
|
|
* our memory inode values are old and we skip
|
|
* stuffing the lvb. There's no need to actually clear
|
|
* out the lvb here as it's value is still valid. */
|
|
if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
|
|
if (set_lvb)
|
|
__ocfs2_stuff_meta_lvb(inode);
|
|
} else
|
|
mlog(0, "lockres %s: downconverting stale lock!\n",
|
|
lockres->l_name);
|
|
|
|
mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, "
|
|
"l_blocking=%d, new_level=%d\n",
|
|
lockres->l_level, lockres->l_blocking, new_level);
|
|
|
|
ocfs2_prepare_downconvert(lockres, new_level);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
|
|
goto leave;
|
|
}
|
|
if (!ocfs2_inode_fully_checkpointed(inode))
|
|
ocfs2_start_checkpoint(osb);
|
|
|
|
*requeue = 1;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ret = 0;
|
|
leave:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres,
|
|
int *requeue,
|
|
ocfs2_convert_worker_t *worker)
|
|
{
|
|
unsigned long flags;
|
|
int blocking;
|
|
int new_level;
|
|
int ret = 0;
|
|
|
|
mlog_entry_void();
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
|
|
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
|
|
|
|
recheck:
|
|
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
|
|
*requeue = 1;
|
|
ret = ocfs2_prepare_cancel_convert(osb, lockres);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
if (ret) {
|
|
ret = ocfs2_cancel_convert(osb, lockres);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
}
|
|
goto leave;
|
|
}
|
|
|
|
/* if we're blocking an exclusive and we have *any* holders,
|
|
* then requeue. */
|
|
if ((lockres->l_blocking == LKM_EXMODE)
|
|
&& (lockres->l_ex_holders || lockres->l_ro_holders)) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
*requeue = 1;
|
|
ret = 0;
|
|
goto leave;
|
|
}
|
|
|
|
/* If it's a PR we're blocking, then only
|
|
* requeue if we've got any EX holders */
|
|
if (lockres->l_blocking == LKM_PRMODE &&
|
|
lockres->l_ex_holders) {
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
*requeue = 1;
|
|
ret = 0;
|
|
goto leave;
|
|
}
|
|
|
|
/* If we get here, then we know that there are no more
|
|
* incompatible holders (and anyone asking for an incompatible
|
|
* lock is blocked). We can now downconvert the lock */
|
|
if (!worker)
|
|
goto downconvert;
|
|
|
|
/* Some lockres types want to do a bit of work before
|
|
* downconverting a lock. Allow that here. The worker function
|
|
* may sleep, so we save off a copy of what we're blocking as
|
|
* it may change while we're not holding the spin lock. */
|
|
blocking = lockres->l_blocking;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
worker(lockres, blocking);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (blocking != lockres->l_blocking) {
|
|
/* If this changed underneath us, then we can't drop
|
|
* it just yet. */
|
|
goto recheck;
|
|
}
|
|
|
|
downconvert:
|
|
*requeue = 0;
|
|
new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
|
|
|
|
ocfs2_prepare_downconvert(lockres, new_level);
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0);
|
|
leave:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
|
|
int blocking)
|
|
{
|
|
struct inode *inode;
|
|
struct address_space *mapping;
|
|
|
|
mlog_entry_void();
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
mapping = inode->i_mapping;
|
|
|
|
if (filemap_fdatawrite(mapping)) {
|
|
mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
}
|
|
sync_mapping_buffers(mapping);
|
|
if (blocking == LKM_EXMODE) {
|
|
truncate_inode_pages(mapping, 0);
|
|
unmap_mapping_range(mapping, 0, 0, 0);
|
|
} else {
|
|
/* We only need to wait on the I/O if we're not also
|
|
* truncating pages because truncate_inode_pages waits
|
|
* for us above. We don't truncate pages if we're
|
|
* blocking anything < EXMODE because we want to keep
|
|
* them around in that case. */
|
|
filemap_fdatawait(mapping);
|
|
}
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
|
|
int *requeue)
|
|
{
|
|
int status;
|
|
struct inode *inode;
|
|
struct ocfs2_super *osb;
|
|
|
|
mlog_entry_void();
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
osb = OCFS2_SB(inode->i_sb);
|
|
|
|
mlog(0, "unblock inode %llu\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
status = ocfs2_generic_unblock_lock(osb,
|
|
lockres,
|
|
requeue,
|
|
ocfs2_data_convert_worker);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
mlog(0, "inode %llu, requeue = %d\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, *requeue);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
|
|
int *requeue)
|
|
{
|
|
int status;
|
|
struct inode *inode;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "Unblock lockres %s\n", lockres->l_name);
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
|
|
status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb),
|
|
lockres,
|
|
requeue,
|
|
NULL);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
|
|
int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
|
|
int *requeue)
|
|
{
|
|
int status;
|
|
struct inode *inode;
|
|
|
|
mlog_entry_void();
|
|
|
|
inode = ocfs2_lock_res_inode(lockres);
|
|
|
|
mlog(0, "unblock inode %llu\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
|
|
status = ocfs2_do_unblock_meta(inode, requeue);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
mlog(0, "inode %llu, requeue = %d\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno, *requeue);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/* Generic unblock function for any lockres whose private data is an
|
|
* ocfs2_super pointer. */
|
|
static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
|
|
int *requeue)
|
|
{
|
|
int status;
|
|
struct ocfs2_super *osb;
|
|
|
|
mlog_entry_void();
|
|
|
|
mlog(0, "Unblock lockres %s\n", lockres->l_name);
|
|
|
|
osb = ocfs2_lock_res_super(lockres);
|
|
|
|
status = ocfs2_generic_unblock_lock(osb,
|
|
lockres,
|
|
requeue,
|
|
NULL);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
int status;
|
|
int requeue = 0;
|
|
unsigned long flags;
|
|
|
|
/* Our reference to the lockres in this function can be
|
|
* considered valid until we remove the OCFS2_LOCK_QUEUED
|
|
* flag. */
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(!lockres);
|
|
BUG_ON(!lockres->l_ops);
|
|
BUG_ON(!lockres->l_ops->unblock);
|
|
|
|
mlog(0, "lockres %s blocked.\n", lockres->l_name);
|
|
|
|
/* Detect whether a lock has been marked as going away while
|
|
* the vote thread was processing other things. A lock can
|
|
* still be marked with OCFS2_LOCK_FREEING after this check,
|
|
* but short circuiting here will still save us some
|
|
* performance. */
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING)
|
|
goto unqueue;
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
status = lockres->l_ops->unblock(lockres, &requeue);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
spin_lock_irqsave(&lockres->l_lock, flags);
|
|
unqueue:
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING || !requeue) {
|
|
lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
|
|
} else
|
|
ocfs2_schedule_blocked_lock(osb, lockres);
|
|
|
|
mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
|
|
requeue ? "yes" : "no");
|
|
spin_unlock_irqrestore(&lockres->l_lock, flags);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
mlog_entry_void();
|
|
|
|
assert_spin_locked(&lockres->l_lock);
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_FREEING) {
|
|
/* Do not schedule a lock for downconvert when it's on
|
|
* the way to destruction - any nodes wanting access
|
|
* to the resource will get it soon. */
|
|
mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
|
|
lockres->l_name, lockres->l_flags);
|
|
return;
|
|
}
|
|
|
|
lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
|
|
|
|
spin_lock(&osb->vote_task_lock);
|
|
if (list_empty(&lockres->l_blocked_list)) {
|
|
list_add_tail(&lockres->l_blocked_list,
|
|
&osb->blocked_lock_list);
|
|
osb->blocked_lock_count++;
|
|
}
|
|
spin_unlock(&osb->vote_task_lock);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
/* This aids in debugging situations where a bad LVB might be involved. */
|
|
void ocfs2_dump_meta_lvb_info(u64 level,
|
|
const char *function,
|
|
unsigned int line,
|
|
struct ocfs2_lock_res *lockres)
|
|
{
|
|
struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
|
|
|
|
mlog(level, "LVB information for %s (called from %s:%u):\n",
|
|
lockres->l_name, function, line);
|
|
mlog(level, "version: %u, clusters: %u\n",
|
|
be32_to_cpu(lvb->lvb_version), be32_to_cpu(lvb->lvb_iclusters));
|
|
mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
|
|
(unsigned long long)be64_to_cpu(lvb->lvb_isize),
|
|
be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
|
|
be16_to_cpu(lvb->lvb_imode));
|
|
mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
|
|
"mtime_packed 0x%llx\n", be16_to_cpu(lvb->lvb_inlink),
|
|
(long long)be64_to_cpu(lvb->lvb_iatime_packed),
|
|
(long long)be64_to_cpu(lvb->lvb_ictime_packed),
|
|
(long long)be64_to_cpu(lvb->lvb_imtime_packed));
|
|
}
|