blob: ab66d5e8d6d697eac5110401d5e37b0f2afa8f9e [file] [log] [blame]
Chris Masondc17ff82008-01-08 15:46:30 -05001/*
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
Chris Masoneb84ae02008-07-17 13:53:27 -040022/* one of these per inode */
Chris Masondc17ff82008-01-08 15:46:30 -050023struct btrfs_ordered_inode_tree {
Chris Masone6dcd2d2008-07-17 12:53:50 -040024 struct mutex mutex;
Chris Masondc17ff82008-01-08 15:46:30 -050025 struct rb_root tree;
Chris Masone6dcd2d2008-07-17 12:53:50 -040026 struct rb_node *last;
Chris Masondc17ff82008-01-08 15:46:30 -050027};
28
Chris Masoneb84ae02008-07-17 13:53:27 -040029/*
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 */
Chris Masone6dcd2d2008-07-17 12:53:50 -040035struct btrfs_sector_sum {
Chris Masond20f7042008-12-08 16:58:54 -050036 /* bytenr on disk */
37 u64 bytenr;
Chris Masone6dcd2d2008-07-17 12:53:50 -040038 u32 sum;
39};
40
41struct btrfs_ordered_sum {
Chris Masond20f7042008-12-08 16:58:54 -050042 /* bytenr is the start of this extent on disk */
43 u64 bytenr;
44
Chris Mason3edf7d32008-07-18 06:17:13 -040045 /*
46 * this is the length in bytes covered by the sums array below.
Chris Mason3edf7d32008-07-18 06:17:13 -040047 */
48 unsigned long len;
Chris Masone6dcd2d2008-07-17 12:53:50 -040049 struct list_head list;
Chris Masoneb84ae02008-07-17 13:53:27 -040050 /* last field is a variable length array of btrfs_sector_sums */
Chris Masoned98b562008-07-22 23:06:42 -040051 struct btrfs_sector_sum sums[];
Chris Masone6dcd2d2008-07-17 12:53:50 -040052};
53
Chris Masoneb84ae02008-07-17 13:53:27 -040054/*
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 */
Chris Masone6dcd2d2008-07-17 12:53:50 -040065#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
Chris Masoneb84ae02008-07-17 13:53:27 -040066
Chris Masone6dcd2d2008-07-17 12:53:50 -040067#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
Chris Masone6dcd2d2008-07-17 12:53:50 -040068
Yan Zheng7ea394f2008-08-05 13:05:02 -040069#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
70
Chris Masonc8b97812008-10-29 14:49:59 -040071#define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */
72
Yan Zhengd899e052008-10-30 14:25:28 -040073#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
74
Chris Masone6dcd2d2008-07-17 12:53:50 -040075struct btrfs_ordered_extent {
Chris Masoneb84ae02008-07-17 13:53:27 -040076 /* logical offset in the file */
Chris Masone6dcd2d2008-07-17 12:53:50 -040077 u64 file_offset;
Chris Masoneb84ae02008-07-17 13:53:27 -040078
79 /* disk byte number */
Chris Masone6dcd2d2008-07-17 12:53:50 -040080 u64 start;
Chris Masoneb84ae02008-07-17 13:53:27 -040081
Chris Masonc8b97812008-10-29 14:49:59 -040082 /* ram length of the extent in bytes */
Chris Masone6dcd2d2008-07-17 12:53:50 -040083 u64 len;
Chris Masoneb84ae02008-07-17 13:53:27 -040084
Chris Masonc8b97812008-10-29 14:49:59 -040085 /* extent length on disk */
86 u64 disk_len;
87
Chris Masoneb84ae02008-07-17 13:53:27 -040088 /* flags (described above) */
Chris Masone6dcd2d2008-07-17 12:53:50 -040089 unsigned long flags;
Chris Masoneb84ae02008-07-17 13:53:27 -040090
91 /* reference count */
Chris Masone6dcd2d2008-07-17 12:53:50 -040092 atomic_t refs;
Chris Masoneb84ae02008-07-17 13:53:27 -040093
Chris Mason3eaa2882008-07-24 11:57:52 -040094 /* the inode we belong to */
95 struct inode *inode;
96
Chris Masoneb84ae02008-07-17 13:53:27 -040097 /* list of checksums for insertion when the extent io is done */
Chris Masone6dcd2d2008-07-17 12:53:50 -040098 struct list_head list;
Chris Masoneb84ae02008-07-17 13:53:27 -040099
100 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
Chris Masone6dcd2d2008-07-17 12:53:50 -0400101 wait_queue_head_t wait;
Chris Masoneb84ae02008-07-17 13:53:27 -0400102
103 /* our friendly rbtree entry */
Chris Masone6dcd2d2008-07-17 12:53:50 -0400104 struct rb_node rb_node;
Chris Mason3eaa2882008-07-24 11:57:52 -0400105
106 /* a per root list of all the pending ordered extents */
107 struct list_head root_extent_list;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400108};
109
110
Chris Masoneb84ae02008-07-17 13:53:27 -0400111/*
112 * calculates the total size you need to allocate for an ordered sum
113 * structure spanning 'bytes' in the file
114 */
Chris Mason9ba46112008-07-23 09:26:26 -0400115static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
116 unsigned long bytes)
Chris Masone6dcd2d2008-07-17 12:53:50 -0400117{
118 unsigned long num_sectors = (bytes + root->sectorsize - 1) /
119 root->sectorsize;
Chris Mason3edf7d32008-07-18 06:17:13 -0400120 num_sectors++;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400121 return sizeof(struct btrfs_ordered_sum) +
122 num_sectors * sizeof(struct btrfs_sector_sum);
123}
124
Chris Masondc17ff82008-01-08 15:46:30 -0500125static inline void
126btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
127{
Chris Masone6dcd2d2008-07-17 12:53:50 -0400128 mutex_init(&t->mutex);
Chris Masondc17ff82008-01-08 15:46:30 -0500129 t->tree.rb_node = NULL;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400130 t->last = NULL;
Chris Masondc17ff82008-01-08 15:46:30 -0500131}
132
Chris Masone6dcd2d2008-07-17 12:53:50 -0400133int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
134int btrfs_remove_ordered_extent(struct inode *inode,
135 struct btrfs_ordered_extent *entry);
136int btrfs_dec_test_ordered_pending(struct inode *inode,
137 u64 file_offset, u64 io_size);
138int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
Yan Zhengd899e052008-10-30 14:25:28 -0400139 u64 start, u64 len, u64 disk_len, int tyep);
Chris Mason3edf7d32008-07-18 06:17:13 -0400140int btrfs_add_ordered_sum(struct inode *inode,
141 struct btrfs_ordered_extent *entry,
142 struct btrfs_ordered_sum *sum);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400143struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
144 u64 file_offset);
Chris Masoneb84ae02008-07-17 13:53:27 -0400145void btrfs_start_ordered_extent(struct inode *inode,
146 struct btrfs_ordered_extent *entry, int wait);
Chris Masoncb843a62008-10-03 12:30:02 -0400147int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400148struct btrfs_ordered_extent *
149btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
Chris Masondbe674a2008-07-17 12:54:05 -0400150int btrfs_ordered_update_i_size(struct inode *inode,
151 struct btrfs_ordered_extent *ordered);
Chris Masond20f7042008-12-08 16:58:54 -0500152int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
Chris Masonf4219502008-07-22 11:18:09 -0400153int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
154 pgoff_t start, pgoff_t end);
155int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
156 loff_t end, int sync_mode);
Yan Zheng7ea394f2008-08-05 13:05:02 -0400157int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
Chris Masondc17ff82008-01-08 15:46:30 -0500158#endif