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         struct mutex                    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          * 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         wait_queue_head_t append_dio_wq;
  85
  86         struct dquot *i_dquot[MAXQUOTAS];
  87 };
  88
  89 /*
  90  * Flags for the ip_flags field
  91  */
  92 /* System file inodes  */
  93 #define OCFS2_INODE_SYSTEM_FILE         0x00000001
  94 #define OCFS2_INODE_JOURNAL             0x00000002
  95 #define OCFS2_INODE_BITMAP              0x00000004
  96 /* This inode has been wiped from disk */
  97 #define OCFS2_INODE_DELETED             0x00000008
  98 /* Has the inode been orphaned on another node?
  99  *
 100  * This hints to ocfs2_drop_inode that it should clear i_nlink before
 101  * continuing.
 102  *
 103  * We *only* set this on unlink vote from another node. If the inode
 104  * was locally orphaned, then we're sure of the state and don't need
 105  * to twiddle i_nlink later - it's either zero or not depending on
 106  * whether our unlink succeeded. Otherwise we got this from a node
 107  * whose intention was to orphan the inode, however he may have
 108  * crashed, failed etc, so we let ocfs2_drop_inode zero the value and
 109  * rely on ocfs2_delete_inode to sort things out under the proper
 110  * cluster locks.
 111  */
 112 #define OCFS2_INODE_MAYBE_ORPHANED      0x00000010
 113 /* Does someone have the file open O_DIRECT */
 114 #define OCFS2_INODE_OPEN_DIRECT         0x00000020
 115 /* Tell the inode wipe code it's not in orphan dir */
 116 #define OCFS2_INODE_SKIP_ORPHAN_DIR     0x00000040
 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 struct kmem_cache *ocfs2_inode_cache;
 127
 128 extern const struct address_space_operations ocfs2_aops;
 129 extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
 130
 131 static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
 132 {
 133         return &OCFS2_I(inode)->ip_metadata_cache;
 134 }
 135
 136 void ocfs2_evict_inode(struct inode *inode);
 137 int ocfs2_drop_inode(struct inode *inode);
 138
 139 /* Flags for ocfs2_iget() */
 140 #define OCFS2_FI_FLAG_SYSFILE           0x1
 141 #define OCFS2_FI_FLAG_ORPHAN_RECOVERY   0x2
 142 struct inode *ocfs2_ilookup(struct super_block *sb, u64 feoff);
 143 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
 144                          int sysfile_type);
 145 int ocfs2_inode_init_private(struct inode *inode);
 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_read_inode(struct inode *inode);
 150 void ocfs2_read_inode2(struct inode *inode, void *opaque);
 151 ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
 152                         size_t size, loff_t *offp);
 153 void ocfs2_sync_blockdev(struct super_block *sb);
 154 void ocfs2_refresh_inode(struct inode *inode,
 155                          struct ocfs2_dinode *fe);
 156 int ocfs2_mark_inode_dirty(handle_t *handle,
 157                            struct inode *inode,
 158                            struct buffer_head *bh);
 159 struct buffer_head *ocfs2_bread(struct inode *inode,
 160                                 int block, int *err, int reada);
 161
 162 void ocfs2_set_inode_flags(struct inode *inode);
 163 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi);
 164
 165 static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
 166 {
 167         int c_to_s_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits - 9;
 168
 169         return (blkcnt_t)OCFS2_I(inode)->ip_clusters << c_to_s_bits;
 170 }
 171
 172 /* Validate that a bh contains a valid inode */
 173 int ocfs2_validate_inode_block(struct super_block *sb,
 174                                struct buffer_head *bh);
 175 /*
 176  * Read an inode block into *bh.  If *bh is NULL, a bh will be allocated.
 177  * This is a cached read.  The inode will be validated with
 178  * ocfs2_validate_inode_block().
 179  */
 180 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
 181 /* The same, but can be passed OCFS2_BH_* flags */
 182 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
 183                                 int flags);
 184
 185 static inline struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
 186 {
 187         return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
 188 }
 189
 190 #endif /* OCFS2_INODE_H */