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
40 #define BTRFS_INODE_HAS_ASYNC_EXTENT 6
42 /* in memory btrfs inode */
44 /* which subvolume this inode belongs to */
45 struct btrfs_root *root;
47 /* key used to find this inode on disk. This is used by the code
48 * to read in roots of subvolumes
50 struct btrfs_key location;
52 /* Lock for counters */
55 /* the extent_tree has caches of all the extent mappings to disk */
56 struct extent_map_tree extent_tree;
58 /* the io_tree does range state (DIRTY, LOCKED etc) */
59 struct extent_io_tree io_tree;
61 /* special utility tree used to record which mirrors have already been
62 * tried when checksums fail for a given block
64 struct extent_io_tree io_failure_tree;
66 /* held while logging the inode in tree-log.c */
67 struct mutex log_mutex;
69 /* held while doing delalloc reservations */
70 struct mutex delalloc_mutex;
72 /* used to order data wrt metadata */
73 struct btrfs_ordered_inode_tree ordered_tree;
75 /* list of all the delalloc inodes in the FS. There are times we need
76 * to write all the delalloc pages to disk, and this list is used
79 struct list_head delalloc_inodes;
82 * list for tracking inodes that must be sent to disk before a
83 * rename or truncate commit
85 struct list_head ordered_operations;
87 /* node for the red-black tree that links inodes in subvolume root */
88 struct rb_node rb_node;
90 unsigned long runtime_flags;
92 /* full 64 bit generation number, struct vfs_inode doesn't have a big
93 * enough field for this.
98 * transid of the trans_handle that last modified this inode
103 * log transid when this inode was last modified
108 * transid that last logged this inode
112 /* total number of bytes pending delalloc, used by stat to calc the
113 * real block usage of the file
118 * the size of the file stored in the metadata on disk. data=ordered
119 * means the in-memory i_size might be larger than the size on disk
120 * because not all the blocks are written yet.
125 * if this is a directory then index_cnt is the counter for the index
126 * number for new files that are created
130 /* the fsync log has some corner cases that mean we have to check
131 * directories to see if any unlinks have been done before
132 * the directory was logged. See tree-log.c for all the
135 u64 last_unlink_trans;
138 * Number of bytes outstanding that are going to need csums. This is
139 * used in ENOSPC accounting.
143 /* flags field from the on disk inode */
147 * Counters to keep track of the number of extent item's we may use due
148 * to delalloc and such. outstanding_extents is the number of extent
149 * items we think we'll end up using, and reserved_extents is the number
150 * of extent items we've reserved metadata for.
152 unsigned outstanding_extents;
153 unsigned reserved_extents;
156 * always compress this one file
158 unsigned force_compress;
160 struct btrfs_delayed_node *delayed_node;
162 struct inode vfs_inode;
165 extern unsigned char btrfs_filetype_table[];
167 static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
169 return container_of(inode, struct btrfs_inode, vfs_inode);
172 static inline u64 btrfs_ino(struct inode *inode)
174 u64 ino = BTRFS_I(inode)->location.objectid;
178 * type == BTRFS_ROOT_ITEM_KEY: subvol dir
180 if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
185 static inline void btrfs_i_size_write(struct inode *inode, u64 size)
187 i_size_write(inode, size);
188 BTRFS_I(inode)->disk_i_size = size;
191 static inline bool btrfs_is_free_space_inode(struct inode *inode)
193 struct btrfs_root *root = BTRFS_I(inode)->root;
195 if (root == root->fs_info->tree_root &&
196 btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
198 if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
203 static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
205 struct btrfs_root *root = BTRFS_I(inode)->root;
208 mutex_lock(&root->log_mutex);
209 if (BTRFS_I(inode)->logged_trans == generation &&
210 BTRFS_I(inode)->last_sub_trans <= root->last_log_commit)
212 mutex_unlock(&root->log_mutex);