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 */ 23 struct btrfs_ordered_inode_tree { 24 spinlock_t lock; 25 struct rb_root tree; 26 struct rb_node *last; 27 }; 28 29 struct 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 74 #define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent 75 * in the logging code. */ 76 struct btrfs_ordered_extent { 77 /* logical offset in the file */ 78 u64 file_offset; 79 80 /* disk byte number */ 81 u64 start; 82 83 /* ram length of the extent in bytes */ 84 u64 len; 85 86 /* extent length on disk */ 87 u64 disk_len; 88 89 /* number of bytes that still need writing */ 90 u64 bytes_left; 91 92 /* number of bytes that still need csumming */ 93 u64 csum_bytes_left; 94 95 /* 96 * the end of the ordered extent which is behind it but 97 * didn't update disk_i_size. Please see the comment of 98 * btrfs_ordered_update_i_size(); 99 */ 100 u64 outstanding_isize; 101 102 /* 103 * If we get truncated we need to adjust the file extent we enter for 104 * this ordered extent so that we do not expose stale data. 105 */ 106 u64 truncated_len; 107 108 /* flags (described above) */ 109 unsigned long flags; 110 111 /* compression algorithm */ 112 int compress_type; 113 114 /* reference count */ 115 atomic_t refs; 116 117 /* the inode we belong to */ 118 struct inode *inode; 119 120 /* list of checksums for insertion when the extent io is done */ 121 struct list_head list; 122 123 /* If we need to wait on this to be done */ 124 struct list_head log_list; 125 126 /* If the transaction needs to wait on this ordered extent */ 127 struct list_head trans_list; 128 129 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ 130 wait_queue_head_t wait; 131 132 /* our friendly rbtree entry */ 133 struct rb_node rb_node; 134 135 /* a per root list of all the pending ordered extents */ 136 struct list_head root_extent_list; 137 138 struct btrfs_work work; 139 140 struct completion completion; 141 struct btrfs_work flush_work; 142 struct list_head work_list; 143 }; 144 145 /* 146 * calculates the total size you need to allocate for an ordered sum 147 * structure spanning 'bytes' in the file 148 */ 149 static inline int btrfs_ordered_sum_size(struct btrfs_root *root, 150 unsigned long bytes) 151 { 152 int num_sectors = (int)DIV_ROUND_UP(bytes, root->sectorsize); 153 return sizeof(struct btrfs_ordered_sum) + num_sectors * sizeof(u32); 154 } 155 156 static inline void 157 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) 158 { 159 spin_lock_init(&t->lock); 160 t->tree = RB_ROOT; 161 t->last = NULL; 162 } 163 164 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); 165 void btrfs_remove_ordered_extent(struct inode *inode, 166 struct btrfs_ordered_extent *entry); 167 int btrfs_dec_test_ordered_pending(struct inode *inode, 168 struct btrfs_ordered_extent **cached, 169 u64 file_offset, u64 io_size, int uptodate); 170 int btrfs_dec_test_first_ordered_pending(struct inode *inode, 171 struct btrfs_ordered_extent **cached, 172 u64 *file_offset, u64 io_size, 173 int uptodate); 174 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, 175 u64 start, u64 len, u64 disk_len, int type); 176 int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset, 177 u64 start, u64 len, u64 disk_len, int type); 178 int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset, 179 u64 start, u64 len, u64 disk_len, 180 int type, int compress_type); 181 void btrfs_add_ordered_sum(struct inode *inode, 182 struct btrfs_ordered_extent *entry, 183 struct btrfs_ordered_sum *sum); 184 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, 185 u64 file_offset); 186 void btrfs_start_ordered_extent(struct inode *inode, 187 struct btrfs_ordered_extent *entry, int wait); 188 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len); 189 struct btrfs_ordered_extent * 190 btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset); 191 struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode, 192 u64 file_offset, 193 u64 len); 194 int btrfs_ordered_update_i_size(struct inode *inode, u64 offset, 195 struct btrfs_ordered_extent *ordered); 196 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, 197 u32 *sum, int len); 198 int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr); 199 void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr); 200 void btrfs_get_logged_extents(struct inode *inode, 201 struct list_head *logged_list, 202 const loff_t start, 203 const loff_t end); 204 void btrfs_put_logged_extents(struct list_head *logged_list); 205 void btrfs_submit_logged_extents(struct list_head *logged_list, 206 struct btrfs_root *log); 207 void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans, 208 struct btrfs_root *log, u64 transid); 209 void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid); 210 int __init ordered_data_init(void); 211 void ordered_data_exit(void); 212 #endif 213