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.
19 #ifndef __BTRFS_ORDERED_DATA__
20 #define __BTRFS_ORDERED_DATA__
22 /* one of these per inode */
23 struct btrfs_ordered_inode_tree {
29 struct btrfs_ordered_sum {
30 /* bytenr is the start of this extent on disk */
34 * this is the length in bytes covered by the sums array below.
37 struct list_head list;
38 /* last field is a variable length array of csums */
43 * bits for the flags field:
45 * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
46 * It is used to make sure metadata is inserted into the tree only once
49 * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
50 * rbtree, just before waking any waiters. It is used to indicate the
51 * IO is done and any metadata is inserted into the tree.
53 #define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
55 #define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
57 #define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
59 #define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
61 #define BTRFS_ORDERED_PREALLOC 4 /* set when writing to preallocated extent */
63 #define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
65 #define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */
67 #define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
68 * has done its due diligence in updating
70 #define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
72 #define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */
74 #define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent
75 * in the logging code. */
76 #define BTRFS_ORDERED_PENDING 11 /* We are waiting for this ordered extent to
77 * complete in the current transaction. */
78 struct btrfs_ordered_extent {
79 /* logical offset in the file */
82 /* disk byte number */
85 /* ram length of the extent in bytes */
88 /* extent length on disk */
91 /* number of bytes that still need writing */
95 * the end of the ordered extent which is behind it but
96 * didn't update disk_i_size. Please see the comment of
97 * btrfs_ordered_update_i_size();
99 u64 outstanding_isize;
102 * If we get truncated we need to adjust the file extent we enter for
103 * this ordered extent so that we do not expose stale data.
107 /* flags (described above) */
110 /* compression algorithm */
113 /* reference count */
116 /* the inode we belong to */
119 /* list of checksums for insertion when the extent io is done */
120 struct list_head list;
122 /* If we need to wait on this to be done */
123 struct list_head log_list;
125 /* If the transaction needs to wait on this ordered extent */
126 struct list_head trans_list;
128 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
129 wait_queue_head_t wait;
131 /* our friendly rbtree entry */
132 struct rb_node rb_node;
134 /* a per root list of all the pending ordered extents */
135 struct list_head root_extent_list;
137 struct btrfs_work work;
139 struct completion completion;
140 struct btrfs_work flush_work;
141 struct list_head work_list;
145 * calculates the total size you need to allocate for an ordered sum
146 * structure spanning 'bytes' in the file
148 static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
151 int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize);
152 return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32);
156 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
158 spin_lock_init(&t->lock);
163 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
164 void btrfs_remove_ordered_extent(struct inode *inode,
165 struct btrfs_ordered_extent *entry);
166 int btrfs_dec_test_ordered_pending(struct inode *inode,
167 struct btrfs_ordered_extent **cached,
168 u64 file_offset, u64 io_size, int uptodate);
169 int btrfs_dec_test_first_ordered_pending(struct inode *inode,
170 struct btrfs_ordered_extent **cached,
171 u64 *file_offset, u64 io_size,
173 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
174 u64 start, u64 len, u64 disk_len, int type);
175 int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
176 u64 start, u64 len, u64 disk_len, int type);
177 int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
178 u64 start, u64 len, u64 disk_len,
179 int type, int compress_type);
180 void btrfs_add_ordered_sum(struct inode *inode,
181 struct btrfs_ordered_extent *entry,
182 struct btrfs_ordered_sum *sum);
183 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
185 void btrfs_start_ordered_extent(struct inode *inode,
186 struct btrfs_ordered_extent *entry, int wait);
187 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
188 struct btrfs_ordered_extent *
189 btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
190 struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
193 bool btrfs_have_ordered_extents_in_range(struct inode *inode,
196 int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
197 struct btrfs_ordered_extent *ordered);
198 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
200 int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr,
201 const u64 range_start, const u64 range_len);
202 int btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr,
203 const u64 range_start, const u64 range_len);
204 void btrfs_get_logged_extents(struct inode *inode,
205 struct list_head *logged_list,
208 void btrfs_put_logged_extents(struct list_head *logged_list);
209 void btrfs_submit_logged_extents(struct list_head *logged_list,
210 struct btrfs_root *log);
211 void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
212 struct btrfs_root *log, u64 transid);
213 void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
214 int __init ordered_data_init(void);
215 void ordered_data_exit(void);