release/src-rt-6.x.4708/linux/linux-2.6.36/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 */
  32 struct 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         u32                             ip_clusters;
  50         struct list_head                ip_io_markers;
  51
  52         struct mutex                    ip_io_mutex;
  53
  54         u32                             ip_flags; /* see below */
  55         u32                             ip_attr; /* inode attributes */
  56         u16                             ip_dyn_features;
  57
  58         /* protected by recovery_lock. */
  59         struct inode                    *ip_next_orphan;
  60
  61         u32                             ip_dir_start_lookup;
  62
  63         struct ocfs2_caching_info       ip_metadata_cache;
  64
  65         struct ocfs2_extent_map         ip_extent_map;
  66
  67         struct inode                    vfs_inode;
  68         struct jbd2_inode               ip_jinode;
  69
  70         /* Only valid if the inode is the dir. */
  71         u32                             ip_last_used_slot;
  72         u64                             ip_last_used_group;
  73
  74         struct ocfs2_alloc_reservation  ip_la_data_resv;
  75 };
  76
  77 /*
  78  * Flags for the ip_flags field
  79  */
  80 /* System file inodes  */
  81 #define OCFS2_INODE_SYSTEM_FILE         0x00000001
  82 #define OCFS2_INODE_JOURNAL             0x00000002
  83 #define OCFS2_INODE_BITMAP              0x00000004
  84 /* This inode has been wiped from disk */
  85 #define OCFS2_INODE_DELETED             0x00000008
  86 /* Another node is deleting, so our delete is a nop */
  87 #define OCFS2_INODE_SKIP_DELETE         0x00000010
  88 /* Has the inode been orphaned on another node?
  89  *
  90  * This hints to ocfs2_drop_inode that it should clear i_nlink before
  91  * continuing.
  92  *
  93  * We *only* set this on unlink vote from another node. If the inode
  94  * was locally orphaned, then we're sure of the state and don't need
  95  * to twiddle i_nlink later - it's either zero or not depending on
  96  * whether our unlink succeeded. Otherwise we got this from a node
  97  * whose intention was to orphan the inode, however he may have
  98  * crashed, failed etc, so we let ocfs2_drop_inode zero the value and
  99  * rely on ocfs2_delete_inode to sort things out under the proper
 100  * cluster locks.
 101  */
 102 #define OCFS2_INODE_MAYBE_ORPHANED      0x00000020
 103 /* Does someone have the file open O_DIRECT */
 104 #define OCFS2_INODE_OPEN_DIRECT         0x00000040
 105 /* Tell the inode wipe code it's not in orphan dir */
 106 #define OCFS2_INODE_SKIP_ORPHAN_DIR     0x00000080
 107
 108 static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
 109 {
 110         return container_of(inode, struct ocfs2_inode_info, vfs_inode);
 111 }
 112
 113 #define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
 114 #define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)
 115
 116 extern struct kmem_cache *ocfs2_inode_cache;
 117
 118 extern const struct address_space_operations ocfs2_aops;
 119 extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
 120
 121 static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
 122 {
 123         return &OCFS2_I(inode)->ip_metadata_cache;
 124 }
 125
 126 void ocfs2_evict_inode(struct inode *inode);
 127 int ocfs2_drop_inode(struct inode *inode);
 128
 129 /* Flags for ocfs2_iget() */
 130 #define OCFS2_FI_FLAG_SYSFILE           0x1
 131 #define OCFS2_FI_FLAG_ORPHAN_RECOVERY   0x2
 132 struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
 133 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
 134                          int sysfile_type);
 135 int ocfs2_inode_init_private(struct inode *inode);
 136 int ocfs2_inode_revalidate(struct dentry *dentry);
 137 void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 138                           int create_ino);
 139 void ocfs2_read_inode(struct inode *inode);
 140 void ocfs2_read_inode2(struct inode *inode, void *opaque);
 141 ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
 142                         size_t size, loff_t *offp);
 143 void ocfs2_sync_blockdev(struct super_block *sb);
 144 void ocfs2_refresh_inode(struct inode *inode,
 145                          struct ocfs2_dinode *fe);
 146 int ocfs2_mark_inode_dirty(handle_t *handle,
 147                            struct inode *inode,
 148                            struct buffer_head *bh);
 149 int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb);
 150 int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb);
 151 struct buffer_head *ocfs2_bread(struct inode *inode,
 152                                 int block, int *err, int reada);
 153
 154 void ocfs2_set_inode_flags(struct inode *inode);
 155 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);
 156
 157 static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
 158 {
 159         int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;
 160
 161         return (blkcnt_t)(OCFS2_I(inode)->ip_clusters << c_to_s_bits);
 162 }
 163
 164 /* Validate that a bh contains a valid inode */
 165 int ocfs2_validate_inode_block(struct super_block *sb,
 166                                struct buffer_head *bh);
 167 /*
 168  * Read an inode block into *bh.  If *bh is NULL, a bh will be allocated.
 169  * This is a cached read.  The inode will be validated with
 170  * ocfs2_validate_inode_block().
 171  */
 172 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
 173 /* The same, but can be passed OCFS2_BH_* flags */
 174 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
 175                                 int flags);
 176
 177 static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
 178 {
 179         return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
 180 }
 181
 182 #endif /* OCFS2_INODE_H */