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         /* Number of outstanding AIO's which are not page aligned */
  47         atomic_t                        ip_unaligned_aio;
  48
  49         /* These fields are protected by ip_lock */
  50         spinlock_t                      ip_lock;
  51         u32                             ip_open_count;
  52         struct list_head                ip_io_markers;
  53         u32                             ip_clusters;
  54
  55         u16                             ip_dyn_features;
  56         struct mutex                    ip_io_mutex;
  57         u32                             ip_flags; /* see below */
  58         u32                             ip_attr; /* inode attributes */
  59
  60         /* protected by recovery_lock. */
  61         struct inode                    *ip_next_orphan;
  62
  63         struct ocfs2_caching_info       ip_metadata_cache;
  64         struct ocfs2_extent_map         ip_extent_map;
  65         struct inode                    vfs_inode;
  66         struct jbd2_inode               ip_jinode;
  67
  68         u32                             ip_dir_start_lookup;
  69
  70         /* Only valid if the inode is the dir. */
  71         u32                             ip_last_used_slot;
  72         u64                             ip_last_used_group;
  73         u32                             ip_dir_lock_gen;
  74
  75         struct ocfs2_alloc_reservation  ip_la_data_resv;
  76 };
  77
  78 /*
  79  * Flags for the ip_flags field
  80  */
  81 /* System file inodes  */
  82 #define OCFS2_INODE_SYSTEM_FILE         0x00000001
  83 #define OCFS2_INODE_JOURNAL             0x00000002
  84 #define OCFS2_INODE_BITMAP              0x00000004
  85 /* This inode has been wiped from disk */
  86 #define OCFS2_INODE_DELETED             0x00000008
  87 /* Another node is deleting, so our delete is a nop */
  88 #define OCFS2_INODE_SKIP_DELETE         0x00000010
  89 /* Has the inode been orphaned on another node?
  90  *
  91  * This hints to ocfs2_drop_inode that it should clear i_nlink before
  92  * continuing.
  93  *
  94  * We *only* set this on unlink vote from another node. If the inode
  95  * was locally orphaned, then we're sure of the state and don't need
  96  * to twiddle i_nlink later - it's either zero or not depending on
  97  * whether our unlink succeeded. Otherwise we got this from a node
  98  * whose intention was to orphan the inode, however he may have
  99  * crashed, failed etc, so we let ocfs2_drop_inode zero the value and
 100  * rely on ocfs2_delete_inode to sort things out under the proper
 101  * cluster locks.
 102  */
 103 #define OCFS2_INODE_MAYBE_ORPHANED      0x00000020
 104 /* Does someone have the file open O_DIRECT */
 105 #define OCFS2_INODE_OPEN_DIRECT         0x00000040
 106 /* Tell the inode wipe code it's not in orphan dir */
 107 #define OCFS2_INODE_SKIP_ORPHAN_DIR     0x00000080
 108
 109 static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
 110 {
 111         return container_of(inode, struct ocfs2_inode_info, vfs_inode);
 112 }
 113
 114 #define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
 115 #define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)
 116
 117 extern struct kmem_cache *ocfs2_inode_cache;
 118
 119 extern const struct address_space_operations ocfs2_aops;
 120 extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
 121
 122 static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
 123 {
 124         return &OCFS2_I(inode)->ip_metadata_cache;
 125 }
 126
 127 void ocfs2_evict_inode(struct inode *inode);
 128 int ocfs2_drop_inode(struct inode *inode);
 129
 130 /* Flags for ocfs2_iget() */
 131 #define OCFS2_FI_FLAG_SYSFILE           0x1
 132 #define OCFS2_FI_FLAG_ORPHAN_RECOVERY   0x2
 133 struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
 134 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
 135                          int sysfile_type);
 136 int ocfs2_inode_init_private(struct inode *inode);
 137 int ocfs2_inode_revalidate(struct dentry *dentry);
 138 void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 139                           int create_ino);
 140 void ocfs2_read_inode(struct inode *inode);
 141 void ocfs2_read_inode2(struct inode *inode, void *opaque);
 142 ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
 143                         size_t size, loff_t *offp);
 144 void ocfs2_sync_blockdev(struct super_block *sb);
 145 void ocfs2_refresh_inode(struct inode *inode,
 146                          struct ocfs2_dinode *fe);
 147 int ocfs2_mark_inode_dirty(handle_t *handle,
 148                            struct inode *inode,
 149                            struct buffer_head *bh);
 150 int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb);
 151 int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb);
 152 struct buffer_head *ocfs2_bread(struct inode *inode,
 153                                 int block, int *err, int reada);
 154
 155 void ocfs2_set_inode_flags(struct inode *inode);
 156 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);
 157
 158 static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
 159 {
 160         int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;
 161
 162         return (blkcnt_t)(OCFS2_I(inode)->ip_clusters << c_to_s_bits);
 163 }
 164
 165 /* Validate that a bh contains a valid inode */
 166 int ocfs2_validate_inode_block(struct super_block *sb,
 167                                struct buffer_head *bh);
 168 /*
 169  * Read an inode block into *bh.  If *bh is NULL, a bh will be allocated.
 170  * This is a cached read.  The inode will be validated with
 171  * ocfs2_validate_inode_block().
 172  */
 173 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
 174 /* The same, but can be passed OCFS2_BH_* flags */
 175 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
 176                                 int flags);
 177
 178 static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
 179 {
 180         return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
 181 }
 182
 183 #endif /* OCFS2_INODE_H */