1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_ORDERED_DATA_H 7 #define BTRFS_ORDERED_DATA_H 8 9 /* one of these per inode */ 10 struct btrfs_ordered_inode_tree { 11 spinlock_t lock; 12 struct rb_root tree; 13 struct rb_node *last; 14 }; 15 16 struct btrfs_ordered_sum { 17 /* bytenr is the start of this extent on disk */ 18 u64 bytenr; 19 20 /* 21 * this is the length in bytes covered by the sums array below. 22 */ 23 int len; 24 struct list_head list; 25 /* last field is a variable length array of csums */ 26 u8 sums[]; 27 }; 28 29 /* 30 * Bits for btrfs_ordered_extent::flags. 31 * 32 * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written. 33 * It is used to make sure metadata is inserted into the tree only once 34 * per extent. 35 * 36 * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the 37 * rbtree, just before waking any waiters. It is used to indicate the 38 * IO is done and any metadata is inserted into the tree. 39 */ 40 enum { 41 /* 42 * Different types for ordered extents, one and only one of the 4 types 43 * need to be set when creating ordered extent. 44 * 45 * REGULAR: For regular non-compressed COW write 46 * NOCOW: For NOCOW write into existing non-hole extent 47 * PREALLOC: For NOCOW write into preallocated extent 48 * COMPRESSED: For compressed COW write 49 */ 50 BTRFS_ORDERED_REGULAR, 51 BTRFS_ORDERED_NOCOW, 52 BTRFS_ORDERED_PREALLOC, 53 BTRFS_ORDERED_COMPRESSED, 54 55 /* 56 * Extra bit for direct io, can only be set for 57 * REGULAR/NOCOW/PREALLOC. No direct io for compressed extent. 58 */ 59 BTRFS_ORDERED_DIRECT, 60 61 /* Extra status bits for ordered extents */ 62 63 /* set when all the pages are written */ 64 BTRFS_ORDERED_IO_DONE, 65 /* set when removed from the tree */ 66 BTRFS_ORDERED_COMPLETE, 67 /* We had an io error when writing this out */ 68 BTRFS_ORDERED_IOERR, 69 /* Set when we have to truncate an extent */ 70 BTRFS_ORDERED_TRUNCATED, 71 /* Used during fsync to track already logged extents */ 72 BTRFS_ORDERED_LOGGED, 73 /* We have already logged all the csums of the ordered extent */ 74 BTRFS_ORDERED_LOGGED_CSUM, 75 /* We wait for this extent to complete in the current transaction */ 76 BTRFS_ORDERED_PENDING, 77 }; 78 79 struct btrfs_ordered_extent { 80 /* logical offset in the file */ 81 u64 file_offset; 82 83 /* 84 * These fields directly correspond to the same fields in 85 * btrfs_file_extent_item. 86 */ 87 u64 disk_bytenr; 88 u64 num_bytes; 89 u64 disk_num_bytes; 90 91 /* number of bytes that still need writing */ 92 u64 bytes_left; 93 94 /* 95 * the end of the ordered extent which is behind it but 96 * didn't update disk_i_size. Please see the comment of 97 * btrfs_ordered_update_i_size(); 98 */ 99 u64 outstanding_isize; 100 101 /* 102 * If we get truncated we need to adjust the file extent we enter for 103 * this ordered extent so that we do not expose stale data. 104 */ 105 u64 truncated_len; 106 107 /* flags (described above) */ 108 unsigned long flags; 109 110 /* compression algorithm */ 111 int compress_type; 112 113 /* Qgroup reserved space */ 114 int qgroup_rsv; 115 116 /* reference count */ 117 refcount_t refs; 118 119 /* the inode we belong to */ 120 struct inode *inode; 121 122 /* list of checksums for insertion when the extent io is done */ 123 struct list_head list; 124 125 /* used for fast fsyncs */ 126 struct list_head log_list; 127 128 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ 129 wait_queue_head_t wait; 130 131 /* our friendly rbtree entry */ 132 struct rb_node rb_node; 133 134 /* a per root list of all the pending ordered extents */ 135 struct list_head root_extent_list; 136 137 struct btrfs_work work; 138 139 struct completion completion; 140 struct btrfs_work flush_work; 141 struct list_head work_list; 142 143 /* 144 * Used to reverse-map physical address returned from ZONE_APPEND write 145 * command in a workqueue context 146 */ 147 u64 physical; 148 struct gendisk *disk; 149 u8 partno; 150 }; 151 152 /* 153 * calculates the total size you need to allocate for an ordered sum 154 * structure spanning 'bytes' in the file 155 */ 156 static inline int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info, 157 unsigned long bytes) 158 { 159 int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize); 160 161 return sizeof(struct btrfs_ordered_sum) + num_sectors * fs_info->csum_size; 162 } 163 164 static inline void 165 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) 166 { 167 spin_lock_init(&t->lock); 168 t->tree = RB_ROOT; 169 t->last = NULL; 170 } 171 172 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); 173 void btrfs_remove_ordered_extent(struct btrfs_inode *btrfs_inode, 174 struct btrfs_ordered_extent *entry); 175 bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode, 176 struct btrfs_ordered_extent **cached, 177 u64 file_offset, u64 io_size, int uptodate); 178 bool btrfs_dec_test_first_ordered_pending(struct btrfs_inode *inode, 179 struct btrfs_ordered_extent **finished_ret, 180 u64 *file_offset, u64 io_size, 181 int uptodate); 182 int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset, 183 u64 disk_bytenr, u64 num_bytes, u64 disk_num_bytes, 184 int type); 185 int btrfs_add_ordered_extent_dio(struct btrfs_inode *inode, u64 file_offset, 186 u64 disk_bytenr, u64 num_bytes, 187 u64 disk_num_bytes, int type); 188 int btrfs_add_ordered_extent_compress(struct btrfs_inode *inode, u64 file_offset, 189 u64 disk_bytenr, u64 num_bytes, 190 u64 disk_num_bytes, int compress_type); 191 void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry, 192 struct btrfs_ordered_sum *sum); 193 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode, 194 u64 file_offset); 195 void btrfs_start_ordered_extent(struct btrfs_ordered_extent *entry, int wait); 196 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len); 197 struct btrfs_ordered_extent * 198 btrfs_lookup_first_ordered_extent(struct btrfs_inode *inode, u64 file_offset); 199 struct btrfs_ordered_extent *btrfs_lookup_ordered_range( 200 struct btrfs_inode *inode, 201 u64 file_offset, 202 u64 len); 203 void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode, 204 struct list_head *list); 205 u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, 206 const u64 range_start, const u64 range_len); 207 void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, 208 const u64 range_start, const u64 range_len); 209 void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start, 210 u64 end, 211 struct extent_state **cached_state); 212 int btrfs_split_ordered_extent(struct btrfs_ordered_extent *ordered, u64 pre, 213 u64 post); 214 int __init ordered_data_init(void); 215 void __cold ordered_data_exit(void); 216 217 #endif 218