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
40 /* in memory btrfs inode */
42 /* which subvolume this inode belongs to */
43 struct btrfs_root *root;
45 /* key used to find this inode on disk. This is used by the code
46 * to read in roots of subvolumes
48 struct btrfs_key location;
50 /* Lock for counters */
53 /* the extent_tree has caches of all the extent mappings to disk */
54 struct extent_map_tree extent_tree;
56 /* the io_tree does range state (DIRTY, LOCKED etc) */
57 struct extent_io_tree io_tree;
59 /* special utility tree used to record which mirrors have already been
60 * tried when checksums fail for a given block
62 struct extent_io_tree io_failure_tree;
64 /* held while logging the inode in tree-log.c */
65 struct mutex log_mutex;
67 /* held while doing delalloc reservations */
68 struct mutex delalloc_mutex;
70 /* used to order data wrt metadata */
71 struct btrfs_ordered_inode_tree ordered_tree;
73 /* for keeping track of orphaned inodes */
74 struct list_head i_orphan;
76 /* list of all the delalloc inodes in the FS. There are times we need
77 * to write all the delalloc pages to disk, and this list is used
80 struct list_head delalloc_inodes;
83 * list for tracking inodes that must be sent to disk before a
84 * rename or truncate commit
86 struct list_head ordered_operations;
88 /* node for the red-black tree that links inodes in subvolume root */
89 struct rb_node rb_node;
91 /* the space_info for where this inode's data allocations are done */
92 struct btrfs_space_info *space_info;
94 unsigned long runtime_flags;
96 /* full 64 bit generation number, struct vfs_inode doesn't have a big
97 * enough field for this.
102 * transid of the trans_handle that last modified this inode
107 * log transid when this inode was last modified
112 * transid that last logged this inode
116 /* total number of bytes pending delalloc, used by stat to calc the
117 * real block usage of the file
122 * the size of the file stored in the metadata on disk. data=ordered
123 * means the in-memory i_size might be larger than the size on disk
124 * because not all the blocks are written yet.
129 * if this is a directory then index_cnt is the counter for the index
130 * number for new files that are created
134 /* the fsync log has some corner cases that mean we have to check
135 * directories to see if any unlinks have been done before
136 * the directory was logged. See tree-log.c for all the
139 u64 last_unlink_trans;
142 * Number of bytes outstanding that are going to need csums. This is
143 * used in ENOSPC accounting.
147 /* flags field from the on disk inode */
151 * Counters to keep track of the number of extent item's we may use due
152 * to delalloc and such. outstanding_extents is the number of extent
153 * items we think we'll end up using, and reserved_extents is the number
154 * of extent items we've reserved metadata for.
156 unsigned outstanding_extents;
157 unsigned reserved_extents;
160 * always compress this one file
162 unsigned force_compress;
164 struct btrfs_delayed_node *delayed_node;
166 struct inode vfs_inode;
169 extern unsigned char btrfs_filetype_table[];
171 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
173 return container_of(inode, struct btrfs_inode, vfs_inode);
176 static inline u64 btrfs_ino(struct inode *inode)
178 u64 ino = BTRFS_I(inode)->location.objectid;
182 * type == BTRFS_ROOT_ITEM_KEY: subvol dir
184 if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
189 static inline void btrfs_i_size_write(struct inode *inode, u64 size)
191 i_size_write(inode, size);
192 BTRFS_I(inode)->disk_i_size = size;
195 static inline bool btrfs_is_free_space_inode(struct btrfs_root *root,
198 if (root == root->fs_info->tree_root ||
199 BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)