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         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
 106 static 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
 114 extern struct kmem_cache *ocfs2_inode_cache;
 115
 116 extern const struct address_space_operations ocfs2_aops;
 117 extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
 118
 119 static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
 120 {
 121         return &OCFS2_I(inode)->ip_metadata_cache;
 122 }
 123
 124 void ocfs2_evict_inode(struct inode *inode);
 125 int 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
 130 struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
 131 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
 132                          int sysfile_type);
 133 int ocfs2_inode_init_private(struct inode *inode);
 134 int ocfs2_inode_revalidate(struct dentry *dentry);
 135 void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 136                           int create_ino);
 137 void ocfs2_read_inode(struct inode *inode);
 138 void ocfs2_read_inode2(struct inode *inode, void *opaque);
 139 ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
 140                         size_t size, loff_t *offp);
 141 void ocfs2_sync_blockdev(struct super_block *sb);
 142 void ocfs2_refresh_inode(struct inode *inode,
 143                          struct ocfs2_dinode *fe);
 144 int ocfs2_mark_inode_dirty(handle_t *handle,
 145                            struct inode *inode,
 146                            struct buffer_head *bh);
 147 int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb);
 148 int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb);
 149 struct buffer_head *ocfs2_bread(struct inode *inode,
 150                                 int block, int *err, int reada);
 151
 152 void ocfs2_set_inode_flags(struct inode *inode);
 153 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);
 154
 155 static 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 */
 163 int 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  */
 170 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
 171 /* The same, but can be passed OCFS2_BH_* flags */
 172 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
 173                                 int flags);
 174
 175 static 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 */