Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 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 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 22 | /* one of these per inode */ |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 23 | struct btrfs_ordered_inode_tree { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 24 | struct mutex mutex; |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 25 | struct rb_root tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 26 | struct rb_node *last; |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 27 | }; |
| 28 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 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 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 35 | struct btrfs_sector_sum { |
| 36 | u64 offset; |
| 37 | u32 sum; |
| 38 | }; |
| 39 | |
| 40 | struct btrfs_ordered_sum { |
| 41 | u64 file_offset; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 42 | /* |
| 43 | * this is the length in bytes covered by the sums array below. |
| 44 | * But, the sums array may not be contiguous in the file. |
| 45 | */ |
| 46 | unsigned long len; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 47 | struct list_head list; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 48 | /* last field is a variable length array of btrfs_sector_sums */ |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 49 | struct btrfs_sector_sum sums[]; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 50 | }; |
| 51 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 52 | /* |
| 53 | * bits for the flags field: |
| 54 | * |
| 55 | * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written. |
| 56 | * It is used to make sure metadata is inserted into the tree only once |
| 57 | * per extent. |
| 58 | * |
| 59 | * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the |
| 60 | * rbtree, just before waking any waiters. It is used to indicate the |
| 61 | * IO is done and any metadata is inserted into the tree. |
| 62 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 63 | #define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */ |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 64 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 65 | #define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 66 | |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 67 | #define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */ |
| 68 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame^] | 69 | #define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */ |
| 70 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 71 | struct btrfs_ordered_extent { |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 72 | /* logical offset in the file */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 73 | u64 file_offset; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 74 | |
| 75 | /* disk byte number */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 76 | u64 start; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 77 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame^] | 78 | /* ram length of the extent in bytes */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 79 | u64 len; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 80 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame^] | 81 | /* extent length on disk */ |
| 82 | u64 disk_len; |
| 83 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 84 | /* flags (described above) */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 85 | unsigned long flags; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 86 | |
| 87 | /* reference count */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 88 | atomic_t refs; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 89 | |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 90 | /* the inode we belong to */ |
| 91 | struct inode *inode; |
| 92 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 93 | /* list of checksums for insertion when the extent io is done */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 94 | struct list_head list; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 95 | |
| 96 | /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 97 | wait_queue_head_t wait; |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 98 | |
| 99 | /* our friendly rbtree entry */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 100 | struct rb_node rb_node; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 101 | |
| 102 | /* a per root list of all the pending ordered extents */ |
| 103 | struct list_head root_extent_list; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 107 | /* |
| 108 | * calculates the total size you need to allocate for an ordered sum |
| 109 | * structure spanning 'bytes' in the file |
| 110 | */ |
Chris Mason | 9ba4611 | 2008-07-23 09:26:26 -0400 | [diff] [blame] | 111 | static inline int btrfs_ordered_sum_size(struct btrfs_root *root, |
| 112 | unsigned long bytes) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 113 | { |
| 114 | unsigned long num_sectors = (bytes + root->sectorsize - 1) / |
| 115 | root->sectorsize; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 116 | num_sectors++; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 117 | return sizeof(struct btrfs_ordered_sum) + |
| 118 | num_sectors * sizeof(struct btrfs_sector_sum); |
| 119 | } |
| 120 | |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 121 | static inline void |
| 122 | btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) |
| 123 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 124 | mutex_init(&t->mutex); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 125 | t->tree.rb_node = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 126 | t->last = NULL; |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 127 | } |
| 128 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 129 | int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); |
| 130 | int btrfs_remove_ordered_extent(struct inode *inode, |
| 131 | struct btrfs_ordered_extent *entry); |
| 132 | int btrfs_dec_test_ordered_pending(struct inode *inode, |
| 133 | u64 file_offset, u64 io_size); |
| 134 | int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame^] | 135 | u64 start, u64 len, u64 disk_len, int nocow, |
| 136 | int compressed); |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 137 | int btrfs_add_ordered_sum(struct inode *inode, |
| 138 | struct btrfs_ordered_extent *entry, |
| 139 | struct btrfs_ordered_sum *sum); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 140 | struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, |
| 141 | u64 file_offset); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 142 | void btrfs_start_ordered_extent(struct inode *inode, |
| 143 | struct btrfs_ordered_extent *entry, int wait); |
Chris Mason | cb843a6 | 2008-10-03 12:30:02 -0400 | [diff] [blame] | 144 | int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 145 | struct btrfs_ordered_extent * |
| 146 | btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 147 | int btrfs_ordered_update_i_size(struct inode *inode, |
| 148 | struct btrfs_ordered_extent *ordered); |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 149 | int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u32 *sum); |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 150 | int btrfs_wait_on_page_writeback_range(struct address_space *mapping, |
| 151 | pgoff_t start, pgoff_t end); |
| 152 | int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start, |
| 153 | loff_t end, int sync_mode); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 154 | int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 155 | #endif |