1328970deSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2*fa60ce2cSMasahiro Yamada /*
3ccd979bdSMark Fasheh * sysfile.c
4ccd979bdSMark Fasheh *
5ccd979bdSMark Fasheh * Initialize, read, write, etc. system files.
6ccd979bdSMark Fasheh *
7ccd979bdSMark Fasheh * Copyright (C) 2002, 2004 Oracle. All rights reserved.
8ccd979bdSMark Fasheh */
9ccd979bdSMark Fasheh
10ccd979bdSMark Fasheh #include <linux/fs.h>
11ccd979bdSMark Fasheh #include <linux/types.h>
12ccd979bdSMark Fasheh #include <linux/highmem.h>
13ccd979bdSMark Fasheh
14ccd979bdSMark Fasheh #include <cluster/masklog.h>
15ccd979bdSMark Fasheh
1680c05846SMark Fasheh #include "ocfs2.h"
1780c05846SMark Fasheh
18ccd979bdSMark Fasheh #include "alloc.h"
19ccd979bdSMark Fasheh #include "dir.h"
20ccd979bdSMark Fasheh #include "inode.h"
21ccd979bdSMark Fasheh #include "journal.h"
22ccd979bdSMark Fasheh #include "sysfile.h"
23ccd979bdSMark Fasheh
24ccd979bdSMark Fasheh #include "buffer_head_io.h"
25ccd979bdSMark Fasheh
26ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
27ccd979bdSMark Fasheh int type,
28ccd979bdSMark Fasheh u32 slot);
29ccd979bdSMark Fasheh
30d246ab30STao Ma #ifdef CONFIG_DEBUG_LOCK_ALLOC
31cb25797dSJan Kara static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
32d246ab30STao Ma #endif
33cb25797dSJan Kara
is_global_system_inode(int type)34ccd979bdSMark Fasheh static inline int is_global_system_inode(int type)
35ccd979bdSMark Fasheh {
36ccd979bdSMark Fasheh return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
37ccd979bdSMark Fasheh type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
38ccd979bdSMark Fasheh }
39ccd979bdSMark Fasheh
get_local_system_inode(struct ocfs2_super * osb,int type,u32 slot)40b4d693fcSTao Ma static struct inode **get_local_system_inode(struct ocfs2_super *osb,
41ccd979bdSMark Fasheh int type,
42ccd979bdSMark Fasheh u32 slot)
43ccd979bdSMark Fasheh {
44b4d693fcSTao Ma int index;
45b4d693fcSTao Ma struct inode **local_system_inodes, **free = NULL;
46b4d693fcSTao Ma
47b4d693fcSTao Ma BUG_ON(slot == OCFS2_INVALID_SLOT);
48b4d693fcSTao Ma BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
49b4d693fcSTao Ma type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
50b4d693fcSTao Ma
51b4d693fcSTao Ma spin_lock(&osb->osb_lock);
52b4d693fcSTao Ma local_system_inodes = osb->local_system_inodes;
53b4d693fcSTao Ma spin_unlock(&osb->osb_lock);
54b4d693fcSTao Ma
55b4d693fcSTao Ma if (unlikely(!local_system_inodes)) {
566396bb22SKees Cook local_system_inodes =
576396bb22SKees Cook kzalloc(array3_size(sizeof(struct inode *),
586396bb22SKees Cook NUM_LOCAL_SYSTEM_INODES,
596396bb22SKees Cook osb->max_slots),
60b4d693fcSTao Ma GFP_NOFS);
61b4d693fcSTao Ma if (!local_system_inodes) {
62b4d693fcSTao Ma mlog_errno(-ENOMEM);
63b4d693fcSTao Ma /*
64b4d693fcSTao Ma * return NULL here so that ocfs2_get_sytem_file_inodes
65b4d693fcSTao Ma * will try to create an inode and use it. We will try
66b4d693fcSTao Ma * to initialize local_system_inodes next time.
67b4d693fcSTao Ma */
68b4d693fcSTao Ma return NULL;
69b4d693fcSTao Ma }
70b4d693fcSTao Ma
71b4d693fcSTao Ma spin_lock(&osb->osb_lock);
72b4d693fcSTao Ma if (osb->local_system_inodes) {
73b4d693fcSTao Ma /* Someone has initialized it for us. */
74b4d693fcSTao Ma free = local_system_inodes;
75b4d693fcSTao Ma local_system_inodes = osb->local_system_inodes;
76b4d693fcSTao Ma } else
77b4d693fcSTao Ma osb->local_system_inodes = local_system_inodes;
78b4d693fcSTao Ma spin_unlock(&osb->osb_lock);
79b4d693fcSTao Ma kfree(free);
80b4d693fcSTao Ma }
81b4d693fcSTao Ma
82b4d693fcSTao Ma index = (slot * NUM_LOCAL_SYSTEM_INODES) +
83b4d693fcSTao Ma (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
84b4d693fcSTao Ma
85b4d693fcSTao Ma return &local_system_inodes[index];
86ccd979bdSMark Fasheh }
87ccd979bdSMark Fasheh
ocfs2_get_system_file_inode(struct ocfs2_super * osb,int type,u32 slot)88ccd979bdSMark Fasheh struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
89ccd979bdSMark Fasheh int type,
90ccd979bdSMark Fasheh u32 slot)
91ccd979bdSMark Fasheh {
92ccd979bdSMark Fasheh struct inode *inode = NULL;
93ccd979bdSMark Fasheh struct inode **arr = NULL;
94ccd979bdSMark Fasheh
95ccd979bdSMark Fasheh /* avoid the lookup if cached in local system file array */
96b4d693fcSTao Ma if (is_global_system_inode(type)) {
97b4d693fcSTao Ma arr = &(osb->global_system_inodes[type]);
98b4d693fcSTao Ma } else
99b4d693fcSTao Ma arr = get_local_system_inode(osb, type, slot);
100ccd979bdSMark Fasheh
10143b10a20Sjiangyiwen mutex_lock(&osb->system_file_mutex);
102ccd979bdSMark Fasheh if (arr && ((inode = *arr) != NULL)) {
103ccd979bdSMark Fasheh /* get a ref in addition to the array ref */
104ccd979bdSMark Fasheh inode = igrab(inode);
10543b10a20Sjiangyiwen mutex_unlock(&osb->system_file_mutex);
106ebdec83bSEric Sesterhenn / snakebyte BUG_ON(!inode);
107ccd979bdSMark Fasheh
108ccd979bdSMark Fasheh return inode;
109ccd979bdSMark Fasheh }
110ccd979bdSMark Fasheh
111ccd979bdSMark Fasheh /* this gets one ref thru iget */
112ccd979bdSMark Fasheh inode = _ocfs2_get_system_file_inode(osb, type, slot);
113ccd979bdSMark Fasheh
114ccd979bdSMark Fasheh /* add one more if putting into array for first time */
115ccd979bdSMark Fasheh if (arr && inode) {
116ccd979bdSMark Fasheh *arr = igrab(inode);
117ebdec83bSEric Sesterhenn / snakebyte BUG_ON(!*arr);
118ccd979bdSMark Fasheh }
11943b10a20Sjiangyiwen mutex_unlock(&osb->system_file_mutex);
120ccd979bdSMark Fasheh return inode;
121ccd979bdSMark Fasheh }
122ccd979bdSMark Fasheh
_ocfs2_get_system_file_inode(struct ocfs2_super * osb,int type,u32 slot)123ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
124ccd979bdSMark Fasheh int type,
125ccd979bdSMark Fasheh u32 slot)
126ccd979bdSMark Fasheh {
127ccd979bdSMark Fasheh char namebuf[40];
128ccd979bdSMark Fasheh struct inode *inode = NULL;
129ccd979bdSMark Fasheh u64 blkno;
130ccd979bdSMark Fasheh int status = 0;
131ccd979bdSMark Fasheh
132ccd979bdSMark Fasheh ocfs2_sprintf_system_inode_name(namebuf,
133ccd979bdSMark Fasheh sizeof(namebuf),
134ccd979bdSMark Fasheh type, slot);
135ccd979bdSMark Fasheh
136be94d117SMark Fasheh status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
137be94d117SMark Fasheh strlen(namebuf), &blkno);
138ccd979bdSMark Fasheh if (status < 0) {
139ccd979bdSMark Fasheh goto bail;
140ccd979bdSMark Fasheh }
141ccd979bdSMark Fasheh
1425fa0613eSJan Kara inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
143ccd979bdSMark Fasheh if (IS_ERR(inode)) {
144ccd979bdSMark Fasheh mlog_errno(PTR_ERR(inode));
145ccd979bdSMark Fasheh inode = NULL;
146ccd979bdSMark Fasheh goto bail;
147ccd979bdSMark Fasheh }
148cb25797dSJan Kara #ifdef CONFIG_DEBUG_LOCK_ALLOC
149cb25797dSJan Kara if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
150cb25797dSJan Kara type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
151cb25797dSJan Kara type == JOURNAL_SYSTEM_INODE) {
152cb25797dSJan Kara /* Ignore inode lock on these inodes as the lock does not
153cb25797dSJan Kara * really belong to any process and lockdep cannot handle
154cb25797dSJan Kara * that */
155cb25797dSJan Kara OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
156cb25797dSJan Kara } else {
157cb25797dSJan Kara lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
158cb25797dSJan Kara l_lockdep_map,
159cb25797dSJan Kara ocfs2_system_inodes[type].si_name,
160cb25797dSJan Kara &ocfs2_sysfile_cluster_lock_key[type], 0);
161cb25797dSJan Kara }
162cb25797dSJan Kara #endif
163ccd979bdSMark Fasheh bail:
164be94d117SMark Fasheh
165ccd979bdSMark Fasheh return inode;
166ccd979bdSMark Fasheh }
167ccd979bdSMark Fasheh
168