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1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19#ifndef __BTRFS_ORDERED_DATA__
20#define __BTRFS_ORDERED_DATA__
21
22/* one of these per inode */
23struct btrfs_ordered_inode_tree {
24 spinlock_t lock;
25 struct rb_root tree;
26 struct rb_node *last;
27};
28
29/*
30 * these are used to collect checksums done just before bios submission.
31 * They are attached via a list into the ordered extent, and
32 * checksum items are inserted into the tree after all the blocks in
33 * the ordered extent are on disk
34 */
35struct btrfs_sector_sum {
36 /* bytenr on disk */
37 u64 bytenr;
38 u32 sum;
39};
40
41struct btrfs_ordered_sum {
42 /* bytenr is the start of this extent on disk */
43 u64 bytenr;
44
45 /*
46 * this is the length in bytes covered by the sums array below.
47 */
48 unsigned long len;
49 struct list_head list;
50 /* last field is a variable length array of btrfs_sector_sums */
51 struct btrfs_sector_sum sums[];
52};
53
54/*
55 * bits for the flags field:
56 *
57 * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
58 * It is used to make sure metadata is inserted into the tree only once
59 * per extent.
60 *
61 * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
62 * rbtree, just before waking any waiters. It is used to indicate the
63 * IO is done and any metadata is inserted into the tree.
64 */
65#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
66
67#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
68
69#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
70
71#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
72
73#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
74
75#define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
76
77struct btrfs_ordered_extent {
78 /* logical offset in the file */
79 u64 file_offset;
80
81 /* disk byte number */
82 u64 start;
83
84 /* ram length of the extent in bytes */
85 u64 len;
86
87 /* extent length on disk */
88 u64 disk_len;
89
90 /* number of bytes that still need writing */
91 u64 bytes_left;
92
93 /* flags (described above) */
94 unsigned long flags;
95
96 /* compression algorithm */
97 int compress_type;
98
99 /* reference count */
100 atomic_t refs;
101
102 /* the inode we belong to */
103 struct inode *inode;
104
105 /* list of checksums for insertion when the extent io is done */
106 struct list_head list;
107
108 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
109 wait_queue_head_t wait;
110
111 /* our friendly rbtree entry */
112 struct rb_node rb_node;
113
114 /* a per root list of all the pending ordered extents */
115 struct list_head root_extent_list;
116};
117
118
119/*
120 * calculates the total size you need to allocate for an ordered sum
121 * structure spanning 'bytes' in the file
122 */
123static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
124 unsigned long bytes)
125{
126 unsigned long num_sectors = (bytes + root->sectorsize - 1) /
127 root->sectorsize;
128 num_sectors++;
129 return sizeof(struct btrfs_ordered_sum) +
130 num_sectors * sizeof(struct btrfs_sector_sum);
131}
132
133static inline void
134btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
135{
136 spin_lock_init(&t->lock);
137 t->tree = RB_ROOT;
138 t->last = NULL;
139}
140
141int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
142int btrfs_remove_ordered_extent(struct inode *inode,
143 struct btrfs_ordered_extent *entry);
144int btrfs_dec_test_ordered_pending(struct inode *inode,
145 struct btrfs_ordered_extent **cached,
146 u64 file_offset, u64 io_size);
147int btrfs_dec_test_first_ordered_pending(struct inode *inode,
148 struct btrfs_ordered_extent **cached,
149 u64 *file_offset, u64 io_size);
150int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
151 u64 start, u64 len, u64 disk_len, int type);
152int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
153 u64 start, u64 len, u64 disk_len, int type);
154int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
155 u64 start, u64 len, u64 disk_len,
156 int type, int compress_type);
157int btrfs_add_ordered_sum(struct inode *inode,
158 struct btrfs_ordered_extent *entry,
159 struct btrfs_ordered_sum *sum);
160struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
161 u64 file_offset);
162void btrfs_start_ordered_extent(struct inode *inode,
163 struct btrfs_ordered_extent *entry, int wait);
164int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
165struct btrfs_ordered_extent *
166btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
167struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
168 u64 file_offset,
169 u64 len);
170int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
171 struct btrfs_ordered_extent *ordered);
172int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
173int btrfs_run_ordered_operations(struct btrfs_root *root, int wait);
174int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
175 struct btrfs_root *root,
176 struct inode *inode);
177int btrfs_wait_ordered_extents(struct btrfs_root *root,
178 int nocow_only, int delay_iput);
179#endif
1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19#ifndef __BTRFS_ORDERED_DATA__
20#define __BTRFS_ORDERED_DATA__
21
22/* one of these per inode */
23struct btrfs_ordered_inode_tree {
24 spinlock_t lock;
25 struct rb_root tree;
26 struct rb_node *last;
27};
28
29struct btrfs_ordered_sum {
30 /* bytenr is the start of this extent on disk */
31 u64 bytenr;
32
33 /*
34 * this is the length in bytes covered by the sums array below.
35 */
36 int len;
37 struct list_head list;
38 /* last field is a variable length array of csums */
39 u32 sums[];
40};
41
42/*
43 * bits for the flags field:
44 *
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
47 * per extent.
48 *
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.
52 */
53#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
54
55#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
56
57#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
58
59#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
60
61#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
62
63#define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
64
65#define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */
66
67#define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
68 * has done its due diligence in updating
69 * the isize. */
70#define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
71 ordered extent */
72#define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */
73
74struct btrfs_ordered_extent {
75 /* logical offset in the file */
76 u64 file_offset;
77
78 /* disk byte number */
79 u64 start;
80
81 /* ram length of the extent in bytes */
82 u64 len;
83
84 /* extent length on disk */
85 u64 disk_len;
86
87 /* number of bytes that still need writing */
88 u64 bytes_left;
89
90 /* number of bytes that still need csumming */
91 u64 csum_bytes_left;
92
93 /*
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();
97 */
98 u64 outstanding_isize;
99
100 /*
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.
103 */
104 u64 truncated_len;
105
106 /* flags (described above) */
107 unsigned long flags;
108
109 /* compression algorithm */
110 int compress_type;
111
112 /* reference count */
113 atomic_t refs;
114
115 /* the inode we belong to */
116 struct inode *inode;
117
118 /* list of checksums for insertion when the extent io is done */
119 struct list_head list;
120
121 /* If we need to wait on this to be done */
122 struct list_head log_list;
123
124 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
125 wait_queue_head_t wait;
126
127 /* our friendly rbtree entry */
128 struct rb_node rb_node;
129
130 /* a per root list of all the pending ordered extents */
131 struct list_head root_extent_list;
132
133 struct btrfs_work work;
134
135 struct completion completion;
136 struct btrfs_work flush_work;
137 struct list_head work_list;
138};
139
140/*
141 * calculates the total size you need to allocate for an ordered sum
142 * structure spanning 'bytes' in the file
143 */
144static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
145 unsigned long bytes)
146{
147 int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize);
148 return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32);
149}
150
151static inline void
152btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
153{
154 spin_lock_init(&t->lock);
155 t->tree = RB_ROOT;
156 t->last = NULL;
157}
158
159void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
160void btrfs_remove_ordered_extent(struct inode *inode,
161 struct btrfs_ordered_extent *entry);
162int btrfs_dec_test_ordered_pending(struct inode *inode,
163 struct btrfs_ordered_extent **cached,
164 u64 file_offset, u64 io_size, int uptodate);
165int btrfs_dec_test_first_ordered_pending(struct inode *inode,
166 struct btrfs_ordered_extent **cached,
167 u64 *file_offset, u64 io_size,
168 int uptodate);
169int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
170 u64 start, u64 len, u64 disk_len, int type);
171int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
172 u64 start, u64 len, u64 disk_len, int type);
173int 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);
176void btrfs_add_ordered_sum(struct inode *inode,
177 struct btrfs_ordered_extent *entry,
178 struct btrfs_ordered_sum *sum);
179struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
180 u64 file_offset);
181void btrfs_start_ordered_extent(struct inode *inode,
182 struct btrfs_ordered_extent *entry, int wait);
183int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
184struct btrfs_ordered_extent *
185btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
186struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
187 u64 file_offset,
188 u64 len);
189int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
190 struct btrfs_ordered_extent *ordered);
191int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
192 u32 *sum, int len);
193int btrfs_run_ordered_operations(struct btrfs_trans_handle *trans,
194 struct btrfs_root *root, int wait);
195void btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
196 struct btrfs_root *root,
197 struct inode *inode);
198int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr);
199void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr);
200void btrfs_get_logged_extents(struct inode *inode,
201 struct list_head *logged_list);
202void btrfs_put_logged_extents(struct list_head *logged_list);
203void btrfs_submit_logged_extents(struct list_head *logged_list,
204 struct btrfs_root *log);
205void btrfs_wait_logged_extents(struct btrfs_root *log, u64 transid);
206void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
207int __init ordered_data_init(void);
208void ordered_data_exit(void);
209#endif