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 #define BTRFS_ORDERED_REGULAR 12 /* Regular IO for COW */
80 struct btrfs_ordered_extent
{
81 /* logical offset in the file */
84 /* disk byte number */
87 /* ram length of the extent in bytes */
90 /* extent length on disk */
93 /* number of bytes that still need writing */
97 * the end of the ordered extent which is behind it but
98 * didn't update disk_i_size. Please see the comment of
99 * btrfs_ordered_update_i_size();
101 u64 outstanding_isize
;
104 * If we get truncated we need to adjust the file extent we enter for
105 * this ordered extent so that we do not expose stale data.
109 /* flags (described above) */
112 /* compression algorithm */
115 /* reference count */
118 /* the inode we belong to */
121 /* list of checksums for insertion when the extent io is done */
122 struct list_head list
;
124 /* If we need to wait on this to be done */
125 struct list_head log_list
;
127 /* If the transaction needs to wait on this ordered extent */
128 struct list_head trans_list
;
130 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
131 wait_queue_head_t wait
;
133 /* our friendly rbtree entry */
134 struct rb_node rb_node
;
136 /* a per root list of all the pending ordered extents */
137 struct list_head root_extent_list
;
139 struct btrfs_work work
;
141 struct completion completion
;
142 struct btrfs_work flush_work
;
143 struct list_head work_list
;
147 * calculates the total size you need to allocate for an ordered sum
148 * structure spanning 'bytes' in the file
150 static inline int btrfs_ordered_sum_size(struct btrfs_fs_info
*fs_info
,
153 int num_sectors
= (int)DIV_ROUND_UP(bytes
, fs_info
->sectorsize
);
154 return sizeof(struct btrfs_ordered_sum
) + num_sectors
* sizeof(u32
);
158 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree
*t
)
160 spin_lock_init(&t
->lock
);
165 void btrfs_put_ordered_extent(struct btrfs_ordered_extent
*entry
);
166 void btrfs_remove_ordered_extent(struct inode
*inode
,
167 struct btrfs_ordered_extent
*entry
);
168 int btrfs_dec_test_ordered_pending(struct inode
*inode
,
169 struct btrfs_ordered_extent
**cached
,
170 u64 file_offset
, u64 io_size
, int uptodate
);
171 int btrfs_dec_test_first_ordered_pending(struct inode
*inode
,
172 struct btrfs_ordered_extent
**cached
,
173 u64
*file_offset
, u64 io_size
,
175 int btrfs_add_ordered_extent(struct inode
*inode
, u64 file_offset
,
176 u64 start
, u64 len
, u64 disk_len
, int type
);
177 int btrfs_add_ordered_extent_dio(struct inode
*inode
, u64 file_offset
,
178 u64 start
, u64 len
, u64 disk_len
, int type
);
179 int btrfs_add_ordered_extent_compress(struct inode
*inode
, u64 file_offset
,
180 u64 start
, u64 len
, u64 disk_len
,
181 int type
, int compress_type
);
182 void btrfs_add_ordered_sum(struct inode
*inode
,
183 struct btrfs_ordered_extent
*entry
,
184 struct btrfs_ordered_sum
*sum
);
185 struct btrfs_ordered_extent
*btrfs_lookup_ordered_extent(struct inode
*inode
,
187 void btrfs_start_ordered_extent(struct inode
*inode
,
188 struct btrfs_ordered_extent
*entry
, int wait
);
189 int btrfs_wait_ordered_range(struct inode
*inode
, u64 start
, u64 len
);
190 struct btrfs_ordered_extent
*
191 btrfs_lookup_first_ordered_extent(struct inode
* inode
, u64 file_offset
);
192 struct btrfs_ordered_extent
*btrfs_lookup_ordered_range(
193 struct btrfs_inode
*inode
,
196 bool btrfs_have_ordered_extents_in_range(struct inode
*inode
,
199 int btrfs_ordered_update_i_size(struct inode
*inode
, u64 offset
,
200 struct btrfs_ordered_extent
*ordered
);
201 int btrfs_find_ordered_sum(struct inode
*inode
, u64 offset
, u64 disk_bytenr
,
203 u64
btrfs_wait_ordered_extents(struct btrfs_root
*root
, u64 nr
,
204 const u64 range_start
, const u64 range_len
);
205 u64
btrfs_wait_ordered_roots(struct btrfs_fs_info
*fs_info
, u64 nr
,
206 const u64 range_start
, const u64 range_len
);
207 void btrfs_get_logged_extents(struct btrfs_inode
*inode
,
208 struct list_head
*logged_list
,
211 void btrfs_put_logged_extents(struct list_head
*logged_list
);
212 void btrfs_submit_logged_extents(struct list_head
*logged_list
,
213 struct btrfs_root
*log
);
214 void btrfs_wait_logged_extents(struct btrfs_trans_handle
*trans
,
215 struct btrfs_root
*log
, u64 transid
);
216 void btrfs_free_logged_extents(struct btrfs_root
*log
, u64 transid
);
217 int __init
ordered_data_init(void);
218 void ordered_data_exit(void);