mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
fa60ce2cb4
The section "19) Editor modelines and other cruft" in Documentation/process/coding-style.rst clearly says, "Do not include any of these in source files." I recently receive a patch to explicitly add a new one. Let's do treewide cleanups, otherwise some people follow the existing code and attempt to upstream their favoriate editor setups. It is even nicer if scripts/checkpatch.pl can check it. If we like to impose coding style in an editor-independent manner, I think editorconfig (patch [1]) is a saner solution. [1] https://lore.kernel.org/lkml/20200703073143.423557-1-danny@kdrag0n.dev/ Link: https://lkml.kernel.org/r/20210324054457.1477489-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> [auxdisplay] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
167 lines
4 KiB
C
167 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 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;
|
|
}
|
|
|