Root/fs/ocfs2/inode.h

1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * inode.h
5 *
6 * Function prototypes
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#ifndef OCFS2_INODE_H
27#define OCFS2_INODE_H
28
29#include "extent_map.h"
30
31/* OCFS2 Inode Private Data */
32struct ocfs2_inode_info
33{
34    u64 ip_blkno;
35
36    struct ocfs2_lock_res ip_rw_lockres;
37    struct ocfs2_lock_res ip_inode_lockres;
38    struct ocfs2_lock_res ip_open_lockres;
39
40    /* protects allocation changes on this inode. */
41    struct rw_semaphore ip_alloc_sem;
42
43    /* protects extended attribute changes on this inode */
44    struct rw_semaphore ip_xattr_sem;
45
46    /* These fields are protected by ip_lock */
47    spinlock_t ip_lock;
48    u32 ip_open_count;
49    struct list_head ip_io_markers;
50    u32 ip_clusters;
51
52    u16 ip_dyn_features;
53    struct mutex ip_io_mutex;
54    u32 ip_flags; /* see below */
55    u32 ip_attr; /* inode attributes */
56
57    /* protected by recovery_lock. */
58    struct inode *ip_next_orphan;
59
60    struct ocfs2_caching_info ip_metadata_cache;
61    struct ocfs2_extent_map ip_extent_map;
62    struct inode vfs_inode;
63    struct jbd2_inode ip_jinode;
64
65    u32 ip_dir_start_lookup;
66
67    /* Only valid if the inode is the dir. */
68    u32 ip_last_used_slot;
69    u64 ip_last_used_group;
70    u32 ip_dir_lock_gen;
71
72    struct ocfs2_alloc_reservation ip_la_data_resv;
73};
74
75/*
76 * Flags for the ip_flags field
77 */
78/* System file inodes */
79#define OCFS2_INODE_SYSTEM_FILE 0x00000001
80#define OCFS2_INODE_JOURNAL 0x00000002
81#define OCFS2_INODE_BITMAP 0x00000004
82/* This inode has been wiped from disk */
83#define OCFS2_INODE_DELETED 0x00000008
84/* Another node is deleting, so our delete is a nop */
85#define OCFS2_INODE_SKIP_DELETE 0x00000010
86/* Has the inode been orphaned on another node?
87 *
88 * This hints to ocfs2_drop_inode that it should clear i_nlink before
89 * continuing.
90 *
91 * We *only* set this on unlink vote from another node. If the inode
92 * was locally orphaned, then we're sure of the state and don't need
93 * to twiddle i_nlink later - it's either zero or not depending on
94 * whether our unlink succeeded. Otherwise we got this from a node
95 * whose intention was to orphan the inode, however he may have
96 * crashed, failed etc, so we let ocfs2_drop_inode zero the value and
97 * rely on ocfs2_delete_inode to sort things out under the proper
98 * cluster locks.
99 */
100#define OCFS2_INODE_MAYBE_ORPHANED 0x00000020
101/* Does someone have the file open O_DIRECT */
102#define OCFS2_INODE_OPEN_DIRECT 0x00000040
103/* Tell the inode wipe code it's not in orphan dir */
104#define OCFS2_INODE_SKIP_ORPHAN_DIR 0x00000080
105
106static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
107{
108    return container_of(inode, struct ocfs2_inode_info, vfs_inode);
109}
110
111#define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
112#define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)
113
114extern struct kmem_cache *ocfs2_inode_cache;
115
116extern const struct address_space_operations ocfs2_aops;
117extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
118
119static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
120{
121    return &OCFS2_I(inode)->ip_metadata_cache;
122}
123
124void ocfs2_evict_inode(struct inode *inode);
125int ocfs2_drop_inode(struct inode *inode);
126
127/* Flags for ocfs2_iget() */
128#define OCFS2_FI_FLAG_SYSFILE 0x1
129#define OCFS2_FI_FLAG_ORPHAN_RECOVERY 0x2
130struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
131struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
132             int sysfile_type);
133int ocfs2_inode_init_private(struct inode *inode);
134int ocfs2_inode_revalidate(struct dentry *dentry);
135void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
136              int create_ino);
137void ocfs2_read_inode(struct inode *inode);
138void ocfs2_read_inode2(struct inode *inode, void *opaque);
139ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
140            size_t size, loff_t *offp);
141void ocfs2_sync_blockdev(struct super_block *sb);
142void ocfs2_refresh_inode(struct inode *inode,
143             struct ocfs2_dinode *fe);
144int ocfs2_mark_inode_dirty(handle_t *handle,
145               struct inode *inode,
146               struct buffer_head *bh);
147int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb);
148int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb);
149struct buffer_head *ocfs2_bread(struct inode *inode,
150                int block, int *err, int reada);
151
152void ocfs2_set_inode_flags(struct inode *inode);
153void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);
154
155static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
156{
157    int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;
158
159    return (blkcnt_t)(OCFS2_I(inode)->ip_clusters << c_to_s_bits);
160}
161
162/* Validate that a bh contains a valid inode */
163int ocfs2_validate_inode_block(struct super_block *sb,
164                   struct buffer_head *bh);
165/*
166 * Read an inode block into *bh. If *bh is NULL, a bh will be allocated.
167 * This is a cached read. The inode will be validated with
168 * ocfs2_validate_inode_block().
169 */
170int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
171/* The same, but can be passed OCFS2_BH_* flags */
172int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
173                int flags);
174
175static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
176{
177    return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
178}
179
180#endif /* OCFS2_INODE_H */
181

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