LXR linux/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