linux/fs/ocfs2/sysfile.c
Thomas Gleixner 328970de0e treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 145
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 84 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190524100844.756442981@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:25:18 -07:00

170 lines
4.1 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* sysfile.c
*
* Initialize, read, write, etc. system files.
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/highmem.h>
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dir.h"
#include "inode.h"
#include "journal.h"
#include "sysfile.h"
#include "buffer_head_io.h"
static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
int type,
u32 slot);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
#endif
static inline int is_global_system_inode(int type)
{
return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
}
static struct inode **get_local_system_inode(struct ocfs2_super *osb,
int type,
u32 slot)
{
int index;
struct inode **local_system_inodes, **free = NULL;
BUG_ON(slot == OCFS2_INVALID_SLOT);
BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
spin_lock(&osb->osb_lock);
local_system_inodes = osb->local_system_inodes;
spin_unlock(&osb->osb_lock);
if (unlikely(!local_system_inodes)) {
local_system_inodes =
kzalloc(array3_size(sizeof(struct inode *),
NUM_LOCAL_SYSTEM_INODES,
osb->max_slots),
GFP_NOFS);
if (!local_system_inodes) {
mlog_errno(-ENOMEM);
/*
* return NULL here so that ocfs2_get_sytem_file_inodes
* will try to create an inode and use it. We will try
* to initialize local_system_inodes next time.
*/
return NULL;
}
spin_lock(&osb->osb_lock);
if (osb->local_system_inodes) {
/* Someone has initialized it for us. */
free = local_system_inodes;
local_system_inodes = osb->local_system_inodes;
} else
osb->local_system_inodes = local_system_inodes;
spin_unlock(&osb->osb_lock);
kfree(free);
}
index = (slot * NUM_LOCAL_SYSTEM_INODES) +
(type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
return &local_system_inodes[index];
}
struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
int type,
u32 slot)
{
struct inode *inode = NULL;
struct inode **arr = NULL;
/* avoid the lookup if cached in local system file array */
if (is_global_system_inode(type)) {
arr = &(osb->global_system_inodes[type]);
} else
arr = get_local_system_inode(osb, type, slot);
mutex_lock(&osb->system_file_mutex);
if (arr && ((inode = *arr) != NULL)) {
/* get a ref in addition to the array ref */
inode = igrab(inode);
mutex_unlock(&osb->system_file_mutex);
BUG_ON(!inode);
return inode;
}
/* this gets one ref thru iget */
inode = _ocfs2_get_system_file_inode(osb, type, slot);
/* add one more if putting into array for first time */
if (arr && inode) {
*arr = igrab(inode);
BUG_ON(!*arr);
}
mutex_unlock(&osb->system_file_mutex);
return inode;
}
static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
int type,
u32 slot)
{
char namebuf[40];
struct inode *inode = NULL;
u64 blkno;
int status = 0;
ocfs2_sprintf_system_inode_name(namebuf,
sizeof(namebuf),
type, slot);
status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
strlen(namebuf), &blkno);
if (status < 0) {
goto bail;
}
inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
if (IS_ERR(inode)) {
mlog_errno(PTR_ERR(inode));
inode = NULL;
goto bail;
}
#ifdef CONFIG_DEBUG_LOCK_ALLOC
if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
type == JOURNAL_SYSTEM_INODE) {
/* Ignore inode lock on these inodes as the lock does not
* really belong to any process and lockdep cannot handle
* that */
OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
} else {
lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
l_lockdep_map,
ocfs2_system_inodes[type].si_name,
&ocfs2_sysfile_cluster_lock_key[type], 0);
}
#endif
bail:
return inode;
}