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linux-sg2042/fs/ocfs2/dlmglue.c

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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* dlmglue.c
*
* Code which implements an OCFS2 specific interface to our DLM.
*
* Copyright (C) 2003, 2004 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/crc32.h>
#include <linux/kthread.h>
#include <linux/pagemap.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <cluster/heartbeat.h>
#include <cluster/nodemanager.h>
#include <cluster/tcp.h>
#include <dlm/dlmapi.h>
#define MLOG_MASK_PREFIX ML_DLM_GLUE
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
#include "slot_map.h"
#include "super.h"
#include "uptodate.h"
#include "vote.h"
#include "buffer_head_io.h"
struct ocfs2_mask_waiter {
struct list_head mw_item;
int mw_status;
struct completion mw_complete;
unsigned long mw_mask;
unsigned long mw_goal;
};
static void ocfs2_inode_ast_func(void *opaque);
static void ocfs2_inode_bast_func(void *opaque,
int level);
static void ocfs2_super_ast_func(void *opaque);
static void ocfs2_super_bast_func(void *opaque,
int level);
static void ocfs2_rename_ast_func(void *opaque);
static void ocfs2_rename_bast_func(void *opaque,
int level);
/* so far, all locks have gotten along with the same unlock ast */
static void ocfs2_unlock_ast_func(void *opaque,
enum dlm_status status);
static int ocfs2_do_unblock_meta(struct inode *inode,
int *requeue);
static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
int *requeue);
static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
int *requeue);
static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
int *requeue);
static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
int *requeue);
typedef void (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
int *requeue,
ocfs2_convert_worker_t *worker);
struct ocfs2_lock_res_ops {
void (*ast)(void *);
void (*bast)(void *, int);
void (*unlock_ast)(void *, enum dlm_status);
int (*unblock)(struct ocfs2_lock_res *, int *);
};
static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
.ast = ocfs2_inode_ast_func,
.bast = ocfs2_inode_bast_func,
.unlock_ast = ocfs2_unlock_ast_func,
.unblock = ocfs2_unblock_inode_lock,
};
static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
.ast = ocfs2_inode_ast_func,
.bast = ocfs2_inode_bast_func,
.unlock_ast = ocfs2_unlock_ast_func,
.unblock = ocfs2_unblock_meta,
};
static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
int blocking);
static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
.ast = ocfs2_inode_ast_func,
.bast = ocfs2_inode_bast_func,
.unlock_ast = ocfs2_unlock_ast_func,
.unblock = ocfs2_unblock_data,
};
static struct ocfs2_lock_res_ops ocfs2_super_lops = {
.ast = ocfs2_super_ast_func,
.bast = ocfs2_super_bast_func,
.unlock_ast = ocfs2_unlock_ast_func,
.unblock = ocfs2_unblock_osb_lock,
};
static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
.ast = ocfs2_rename_ast_func,
.bast = ocfs2_rename_bast_func,
.unlock_ast = ocfs2_unlock_ast_func,
.unblock = ocfs2_unblock_osb_lock,
};
static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_META ||
lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
lockres->l_type == OCFS2_LOCK_TYPE_RW;
}
static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_SUPER;
}
static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_RENAME;
}
static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres)
{
BUG_ON(!ocfs2_is_super_lock(lockres)
&& !ocfs2_is_rename_lock(lockres));
return (struct ocfs2_super *) lockres->l_priv;
}
static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
{
BUG_ON(!ocfs2_is_inode_lock(lockres));
return (struct inode *) lockres->l_priv;
}
static int ocfs2_lock_create(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
int level,
int dlm_flags);
static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
int wanted);
static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
int level);
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres);
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
int convert);
#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
"resource %s: %s\n", dlm_errname(_stat), _func, \
_lockres->l_name, dlm_errmsg(_stat)); \
} while (0)
static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres);
static int ocfs2_meta_lock_update(struct inode *inode,
struct buffer_head **bh);
static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
static inline int ocfs2_highest_compat_lock_level(int level);
static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
struct ocfs2_lock_res *lockres,
int new_level);
static char *ocfs2_lock_type_strings[] = {
[OCFS2_LOCK_TYPE_META] = "Meta",
[OCFS2_LOCK_TYPE_DATA] = "Data",
[OCFS2_LOCK_TYPE_SUPER] = "Super",
[OCFS2_LOCK_TYPE_RENAME] = "Rename",
/* Need to differntiate from [R]ename.. serializing writes is the
* important job it does, anyway. */
[OCFS2_LOCK_TYPE_RW] = "Write/Read",
};
static char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
{
mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type);
return ocfs2_lock_type_strings[type];
}
static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
u64 blkno,
u32 generation,
char *name)
{
int len;
mlog_entry_void();
BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016"MLFx64"%08x",
ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, blkno,
generation);
BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
mlog(0, "built lock resource with name: %s\n", name);
mlog_exit_void();
}
static spinlock_t ocfs2_dlm_tracking_lock = SPIN_LOCK_UNLOCKED;
static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
struct ocfs2_dlm_debug *dlm_debug)
{
mlog(0, "Add tracking for lockres %s\n", res->l_name);
spin_lock(&ocfs2_dlm_tracking_lock);
list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
spin_unlock(&ocfs2_dlm_tracking_lock);
}
static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
{
spin_lock(&ocfs2_dlm_tracking_lock);
if (!list_empty(&res->l_debug_list))
list_del_init(&res->l_debug_list);
spin_unlock(&ocfs2_dlm_tracking_lock);
}
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
struct ocfs2_lock_res *res,
enum ocfs2_lock_type type,
u64 blkno,
u32 generation,
struct ocfs2_lock_res_ops *ops,
void *priv)
{
ocfs2_build_lock_name(type, blkno, generation, res->l_name);
res->l_type = type;
res->l_ops = ops;
res->l_priv = priv;
res->l_level = LKM_IVMODE;
res->l_requested = LKM_IVMODE;
res->l_blocking = LKM_IVMODE;
res->l_action = OCFS2_AST_INVALID;
res->l_unlock_action = OCFS2_UNLOCK_INVALID;
res->l_flags = OCFS2_LOCK_INITIALIZED;
ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
}
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
{
/* This also clears out the lock status block */
memset(res, 0, sizeof(struct ocfs2_lock_res));
spin_lock_init(&res->l_lock);
init_waitqueue_head(&res->l_event);
INIT_LIST_HEAD(&res->l_blocked_list);
INIT_LIST_HEAD(&res->l_mask_waiters);
}
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
enum ocfs2_lock_type type,
struct inode *inode)
{
struct ocfs2_lock_res_ops *ops;
switch(type) {
case OCFS2_LOCK_TYPE_RW:
ops = &ocfs2_inode_rw_lops;
break;
case OCFS2_LOCK_TYPE_META:
ops = &ocfs2_inode_meta_lops;
break;
case OCFS2_LOCK_TYPE_DATA:
ops = &ocfs2_inode_data_lops;
break;
default:
mlog_bug_on_msg(1, "type: %d\n", type);
ops = NULL; /* thanks, gcc */
break;
};
ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type,
OCFS2_I(inode)->ip_blkno,
inode->i_generation, ops, inode);
}
static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
struct ocfs2_super *osb)
{
/* Superblock lockres doesn't come from a slab so we call init
* once on it manually. */
ocfs2_lock_res_init_once(res);
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
OCFS2_SUPER_BLOCK_BLKNO, 0,
&ocfs2_super_lops, osb);
}
static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
struct ocfs2_super *osb)
{
/* Rename lockres doesn't come from a slab so we call init
* once on it manually. */
ocfs2_lock_res_init_once(res);
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 0, 0,
&ocfs2_rename_lops, osb);
}
void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
{
mlog_entry_void();
if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
return;
ocfs2_remove_lockres_tracking(res);
mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
"Lockres %s is on the blocked list\n",
res->l_name);
mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
"Lockres %s has mask waiters pending\n",
res->l_name);
mlog_bug_on_msg(spin_is_locked(&res->l_lock),
"Lockres %s is locked\n",
res->l_name);
mlog_bug_on_msg(res->l_ro_holders,
"Lockres %s has %u ro holders\n",
res->l_name, res->l_ro_holders);
mlog_bug_on_msg(res->l_ex_holders,
"Lockres %s has %u ex holders\n",
res->l_name, res->l_ex_holders);
/* Need to clear out the lock status block for the dlm */
memset(&res->l_lksb, 0, sizeof(res->l_lksb));
res->l_flags = 0UL;
mlog_exit_void();
}
static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
int level)
{
mlog_entry_void();
BUG_ON(!lockres);
switch(level) {
case LKM_EXMODE:
lockres->l_ex_holders++;
break;
case LKM_PRMODE:
lockres->l_ro_holders++;
break;
default:
BUG();
}
mlog_exit_void();
}
static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
int level)
{
mlog_entry_void();
BUG_ON(!lockres);
switch(level) {
case LKM_EXMODE:
BUG_ON(!lockres->l_ex_holders);
lockres->l_ex_holders--;
break;
case LKM_PRMODE:
BUG_ON(!lockres->l_ro_holders);
lockres->l_ro_holders--;
break;
default:
BUG();
}
mlog_exit_void();
}
/* WARNING: This function lives in a world where the only three lock
* levels are EX, PR, and NL. It *will* have to be adjusted when more
* lock types are added. */
static inline int ocfs2_highest_compat_lock_level(int level)
{
int new_level = LKM_EXMODE;
if (level == LKM_EXMODE)
new_level = LKM_NLMODE;
else if (level == LKM_PRMODE)
new_level = LKM_PRMODE;
return new_level;
}
static void lockres_set_flags(struct ocfs2_lock_res *lockres,
unsigned long newflags)
{
struct list_head *pos, *tmp;
struct ocfs2_mask_waiter *mw;
assert_spin_locked(&lockres->l_lock);
lockres->l_flags = newflags;
list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) {
mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item);
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
continue;
list_del_init(&mw->mw_item);
mw->mw_status = 0;
complete(&mw->mw_complete);
}
}
static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
{
lockres_set_flags(lockres, lockres->l_flags | or);
}
static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
unsigned long clear)
{
lockres_set_flags(lockres, lockres->l_flags & ~clear);
}
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
{
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 %"MLFu64", l_action = %u, type = %s\n",
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 %"MLFu64"\n", lksb->status,
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 %"MLFu64", blocking = %d, level = %d "
"type = %s\n", 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 %"MLFu64"\n", 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 %"MLFu64" take %s RW lock\n",
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 %"MLFu64" drop %s RW lock\n",
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 %"MLFu64" take %s DATA lock\n",
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 %"MLFu64" drop %s DATA lock\n",
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 %"MLFu64" was deleted while we "
"were waiting on a lock. ip_flags = 0x%x\n",
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 %"MLFu64"\n",
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 %"MLFu64" disk generation: %u "
"inode->i_generation: %u\n",
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 %"MLFu64" dtime: %"MLFu64" "
"flags: 0x%x\n", oi->ip_blkno,
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 %"MLFu64", take %s META lock\n",
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 %"MLFu64" drop %s META lock\n",
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 %"MLFu64" for downconvert!",
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 %"MLFu64"\n", 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 %"MLFu64", requeue = %d\n",
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 %"MLFu64"\n", OCFS2_I(inode)->ip_blkno);
status = ocfs2_do_unblock_meta(inode, requeue);
if (status < 0)
mlog_errno(status);
mlog(0, "inode %"MLFu64", requeue = %d\n",
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: %"MLFu64", uid %u, gid %u, mode 0x%x\n",
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%"MLFx64", "
"ctime_packed 0x%"MLFx64", mtime_packed 0x%"MLFx64"\n",
be16_to_cpu(lvb->lvb_inlink), be64_to_cpu(lvb->lvb_iatime_packed),
be64_to_cpu(lvb->lvb_ictime_packed),
be64_to_cpu(lvb->lvb_imtime_packed));
}
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