2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
22 #include "extent_map.h"
23 #include "extent_io.h"
24 #include "ordered-data.h"
25 #include "delayed-inode.h"
28 * ordered_data_close is set by truncate when a file that used
29 * to have good data has been truncated to zero. When it is set
30 * the btrfs file release call will add this inode to the
31 * ordered operations list so that we make sure to flush out any
32 * new data the application may have written before commit.
34 #define BTRFS_INODE_ORDERED_DATA_CLOSE 0
35 #define BTRFS_INODE_ORPHAN_META_RESERVED 1
36 #define BTRFS_INODE_DUMMY 2
37 #define BTRFS_INODE_IN_DEFRAG 3
38 #define BTRFS_INODE_DELALLOC_META_RESERVED 4
39 #define BTRFS_INODE_HAS_ORPHAN_ITEM 5
41 /* in memory btrfs inode */
43 /* which subvolume this inode belongs to */
44 struct btrfs_root
*root
;
46 /* key used to find this inode on disk. This is used by the code
47 * to read in roots of subvolumes
49 struct btrfs_key location
;
51 /* Lock for counters */
54 /* the extent_tree has caches of all the extent mappings to disk */
55 struct extent_map_tree extent_tree
;
57 /* the io_tree does range state (DIRTY, LOCKED etc) */
58 struct extent_io_tree io_tree
;
60 /* special utility tree used to record which mirrors have already been
61 * tried when checksums fail for a given block
63 struct extent_io_tree io_failure_tree
;
65 /* held while logging the inode in tree-log.c */
66 struct mutex log_mutex
;
68 /* held while doing delalloc reservations */
69 struct mutex delalloc_mutex
;
71 /* used to order data wrt metadata */
72 struct btrfs_ordered_inode_tree ordered_tree
;
74 /* list of all the delalloc inodes in the FS. There are times we need
75 * to write all the delalloc pages to disk, and this list is used
78 struct list_head delalloc_inodes
;
81 * list for tracking inodes that must be sent to disk before a
82 * rename or truncate commit
84 struct list_head ordered_operations
;
86 /* node for the red-black tree that links inodes in subvolume root */
87 struct rb_node rb_node
;
89 /* the space_info for where this inode's data allocations are done */
90 struct btrfs_space_info
*space_info
;
92 unsigned long runtime_flags
;
94 /* full 64 bit generation number, struct vfs_inode doesn't have a big
95 * enough field for this.
100 * transid of the trans_handle that last modified this inode
105 * log transid when this inode was last modified
110 * transid that last logged this inode
114 /* total number of bytes pending delalloc, used by stat to calc the
115 * real block usage of the file
120 * the size of the file stored in the metadata on disk. data=ordered
121 * means the in-memory i_size might be larger than the size on disk
122 * because not all the blocks are written yet.
127 * if this is a directory then index_cnt is the counter for the index
128 * number for new files that are created
132 /* the fsync log has some corner cases that mean we have to check
133 * directories to see if any unlinks have been done before
134 * the directory was logged. See tree-log.c for all the
137 u64 last_unlink_trans
;
140 * Number of bytes outstanding that are going to need csums. This is
141 * used in ENOSPC accounting.
145 /* flags field from the on disk inode */
149 * Counters to keep track of the number of extent item's we may use due
150 * to delalloc and such. outstanding_extents is the number of extent
151 * items we think we'll end up using, and reserved_extents is the number
152 * of extent items we've reserved metadata for.
154 unsigned outstanding_extents
;
155 unsigned reserved_extents
;
158 * always compress this one file
160 unsigned force_compress
;
162 struct btrfs_delayed_node
*delayed_node
;
164 struct inode vfs_inode
;
167 extern unsigned char btrfs_filetype_table
[];
169 static inline struct btrfs_inode
*BTRFS_I(struct inode
*inode
)
171 return container_of(inode
, struct btrfs_inode
, vfs_inode
);
174 static inline u64
btrfs_ino(struct inode
*inode
)
176 u64 ino
= BTRFS_I(inode
)->location
.objectid
;
180 * type == BTRFS_ROOT_ITEM_KEY: subvol dir
182 if (!ino
|| BTRFS_I(inode
)->location
.type
== BTRFS_ROOT_ITEM_KEY
)
187 static inline void btrfs_i_size_write(struct inode
*inode
, u64 size
)
189 i_size_write(inode
, size
);
190 BTRFS_I(inode
)->disk_i_size
= size
;
193 static inline bool btrfs_is_free_space_inode(struct btrfs_root
*root
,
196 if (root
== root
->fs_info
->tree_root
||
197 BTRFS_I(inode
)->location
.objectid
== BTRFS_FREE_INO_OBJECTID
)
202 static inline int btrfs_inode_in_log(struct inode
*inode
, u64 generation
)
204 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
207 mutex_lock(&root
->log_mutex
);
208 if (BTRFS_I(inode
)->logged_trans
== generation
&&
209 BTRFS_I(inode
)->last_sub_trans
<= root
->last_log_commit
)
211 mutex_unlock(&root
->log_mutex
);