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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/inode.h

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  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         /* Record unwritten extents during direct io. */
 58         struct list_head                ip_unwritten_list;
 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          * Transactions that contain inode's metadata needed to complete
 79          * fsync and fdatasync, respectively.
 80          */
 81         tid_t i_sync_tid;
 82         tid_t i_datasync_tid;
 83 
 84         struct dquot *i_dquot[MAXQUOTAS];
 85 };
 86 
 87 /*
 88  * Flags for the ip_flags field
 89  */
 90 /* System file inodes  */
 91 #define OCFS2_INODE_SYSTEM_FILE         0x00000001
 92 #define OCFS2_INODE_JOURNAL             0x00000002
 93 #define OCFS2_INODE_BITMAP              0x00000004
 94 /* This inode has been wiped from disk */
 95 #define OCFS2_INODE_DELETED             0x00000008
 96 /* Has the inode been orphaned on another node?
 97  *
 98  * This hints to ocfs2_drop_inode that it should clear i_nlink before
 99  * continuing.
100  *
101  * We *only* set this on unlink vote from another node. If the inode
102  * was locally orphaned, then we're sure of the state and don't need
103  * to twiddle i_nlink later - it's either zero or not depending on
104  * whether our unlink succeeded. Otherwise we got this from a node
105  * whose intention was to orphan the inode, however he may have
106  * crashed, failed etc, so we let ocfs2_drop_inode zero the value and
107  * rely on ocfs2_delete_inode to sort things out under the proper
108  * cluster locks.
109  */
110 #define OCFS2_INODE_MAYBE_ORPHANED      0x00000010
111 /* Does someone have the file open O_DIRECT */
112 #define OCFS2_INODE_OPEN_DIRECT         0x00000020
113 /* Tell the inode wipe code it's not in orphan dir */
114 #define OCFS2_INODE_SKIP_ORPHAN_DIR     0x00000040
115 /* Entry in orphan dir with 'dio-' prefix */
116 #define OCFS2_INODE_DIO_ORPHAN_ENTRY    0x00000080
117 
118 static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
119 {
120         return container_of(inode, struct ocfs2_inode_info, vfs_inode);
121 }
122 
123 #define INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags & OCFS2_INODE_JOURNAL)
124 #define SET_INODE_JOURNAL(i) (OCFS2_I(i)->ip_flags |= OCFS2_INODE_JOURNAL)
125 
126 extern const struct address_space_operations ocfs2_aops;
127 extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
128 
129 static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
130 {
131         return &OCFS2_I(inode)->ip_metadata_cache;
132 }
133 
134 void ocfs2_evict_inode(struct inode *inode);
135 int ocfs2_drop_inode(struct inode *inode);
136 
137 /* Flags for ocfs2_iget() */
138 #define OCFS2_FI_FLAG_SYSFILE           0x1
139 #define OCFS2_FI_FLAG_ORPHAN_RECOVERY   0x2
140 #define OCFS2_FI_FLAG_FILECHECK_CHK     0x4
141 #define OCFS2_FI_FLAG_FILECHECK_FIX     0x8
142 
143 struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
144 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
145                          int sysfile_type);
146 int ocfs2_inode_revalidate(struct dentry *dentry);
147 void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
148                           int create_ino);
149 void ocfs2_sync_blockdev(struct super_block *sb);
150 void ocfs2_refresh_inode(struct inode *inode,
151                          struct ocfs2_dinode *fe);
152 int ocfs2_mark_inode_dirty(handle_t *handle,
153                            struct inode *inode,
154                            struct buffer_head *bh);
155 
156 void ocfs2_set_inode_flags(struct inode *inode);
157 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);
158 
159 static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
160 {
161         int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;
162 
163         return (blkcnt_t)OCFS2_I(inode)->ip_clusters << c_to_s_bits;
164 }
165 
166 /* Validate that a bh contains a valid inode */
167 int ocfs2_validate_inode_block(struct super_block *sb,
168                                struct buffer_head *bh);
169 /*
170  * Read an inode block into *bh.  If *bh is NULL, a bh will be allocated.
171  * This is a cached read.  The inode will be validated with
172  * ocfs2_validate_inode_block().
173  */
174 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
175 /* The same, but can be passed OCFS2_BH_* flags */
176 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
177                                 int flags);
178 
179 static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
180 {
181         return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
182 }
183 
184 /* Does this inode have the reflink flag set? */
185 static inline bool ocfs2_is_refcount_inode(struct inode *inode)
186 {
187         return (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
188 }
189 
190 #endif /* OCFS2_INODE_H */
191 

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