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 prealloced 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 struct btrfs_ordered_extent
{
75 /* logical offset in the file */
78 /* disk byte number */
81 /* ram length of the extent in bytes */
84 /* extent length on disk */
87 /* number of bytes that still need writing */
90 /* number of bytes that still need csumming */
94 * the end of the ordered extent which is behind it but
95 * didn't update disk_i_size. Please see the comment of
96 * btrfs_ordered_update_i_size();
98 u64 outstanding_isize
;
101 * If we get truncated we need to adjust the file extent we enter for
102 * this ordered extent so that we do not expose stale data.
106 /* flags (described above) */
109 /* compression algorithm */
112 /* reference count */
115 /* the inode we belong to */
118 /* list of checksums for insertion when the extent io is done */
119 struct list_head list
;
121 /* If we need to wait on this to be done */
122 struct list_head log_list
;
124 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
125 wait_queue_head_t wait
;
127 /* our friendly rbtree entry */
128 struct rb_node rb_node
;
130 /* a per root list of all the pending ordered extents */
131 struct list_head root_extent_list
;
133 struct btrfs_work work
;
135 struct completion completion
;
136 struct btrfs_work flush_work
;
137 struct list_head work_list
;
141 * calculates the total size you need to allocate for an ordered sum
142 * structure spanning 'bytes' in the file
144 static inline int btrfs_ordered_sum_size(struct btrfs_root
*root
,
147 int num_sectors
= (int)DIV_ROUND_UP(bytes
, root
->sectorsize
);
148 return sizeof(struct btrfs_ordered_sum
) + num_sectors
* sizeof(u32
);
152 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree
*t
)
154 spin_lock_init(&t
->lock
);
159 void btrfs_put_ordered_extent(struct btrfs_ordered_extent
*entry
);
160 void btrfs_remove_ordered_extent(struct inode
*inode
,
161 struct btrfs_ordered_extent
*entry
);
162 int btrfs_dec_test_ordered_pending(struct inode
*inode
,
163 struct btrfs_ordered_extent
**cached
,
164 u64 file_offset
, u64 io_size
, int uptodate
);
165 int btrfs_dec_test_first_ordered_pending(struct inode
*inode
,
166 struct btrfs_ordered_extent
**cached
,
167 u64
*file_offset
, u64 io_size
,
169 int btrfs_add_ordered_extent(struct inode
*inode
, u64 file_offset
,
170 u64 start
, u64 len
, u64 disk_len
, int type
);
171 int btrfs_add_ordered_extent_dio(struct inode
*inode
, u64 file_offset
,
172 u64 start
, u64 len
, u64 disk_len
, int type
);
173 int btrfs_add_ordered_extent_compress(struct inode
*inode
, u64 file_offset
,
174 u64 start
, u64 len
, u64 disk_len
,
175 int type
, int compress_type
);
176 void btrfs_add_ordered_sum(struct inode
*inode
,
177 struct btrfs_ordered_extent
*entry
,
178 struct btrfs_ordered_sum
*sum
);
179 struct btrfs_ordered_extent
*btrfs_lookup_ordered_extent(struct inode
*inode
,
181 void btrfs_start_ordered_extent(struct inode
*inode
,
182 struct btrfs_ordered_extent
*entry
, int wait
);
183 void btrfs_wait_ordered_range(struct inode
*inode
, u64 start
, u64 len
);
184 struct btrfs_ordered_extent
*
185 btrfs_lookup_first_ordered_extent(struct inode
* inode
, u64 file_offset
);
186 struct btrfs_ordered_extent
*btrfs_lookup_ordered_range(struct inode
*inode
,
189 int btrfs_ordered_update_i_size(struct inode
*inode
, u64 offset
,
190 struct btrfs_ordered_extent
*ordered
);
191 int btrfs_find_ordered_sum(struct inode
*inode
, u64 offset
, u64 disk_bytenr
,
193 int btrfs_run_ordered_operations(struct btrfs_trans_handle
*trans
,
194 struct btrfs_root
*root
, int wait
);
195 void btrfs_add_ordered_operation(struct btrfs_trans_handle
*trans
,
196 struct btrfs_root
*root
,
197 struct inode
*inode
);
198 void btrfs_wait_ordered_extents(struct btrfs_root
*root
);
199 void btrfs_wait_all_ordered_extents(struct btrfs_fs_info
*fs_info
);
200 void btrfs_get_logged_extents(struct btrfs_root
*log
, struct inode
*inode
);
201 void btrfs_wait_logged_extents(struct btrfs_root
*log
, u64 transid
);
202 void btrfs_free_logged_extents(struct btrfs_root
*log
, u64 transid
);
203 int __init
ordered_data_init(void);
204 void ordered_data_exit(void);