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 /* BTRFS_IOC_ENCODED_WRITE */ 78 BTRFS_ORDERED_ENCODED, 79 }; 80 81 /* BTRFS_ORDERED_* flags that specify the type of the extent. */ 82 #define BTRFS_ORDERED_TYPE_FLAGS ((1UL << BTRFS_ORDERED_REGULAR) | \ 83 (1UL << BTRFS_ORDERED_NOCOW) | \ 84 (1UL << BTRFS_ORDERED_PREALLOC) | \ 85 (1UL << BTRFS_ORDERED_COMPRESSED) | \ 86 (1UL << BTRFS_ORDERED_DIRECT) | \ 87 (1UL << BTRFS_ORDERED_ENCODED)) 88 89 struct btrfs_ordered_extent { 90 /* logical offset in the file */ 91 u64 file_offset; 92 93 /* 94 * These fields directly correspond to the same fields in 95 * btrfs_file_extent_item. 96 */ 97 u64 num_bytes; 98 u64 ram_bytes; 99 u64 disk_bytenr; 100 u64 disk_num_bytes; 101 u64 offset; 102 103 /* number of bytes that still need writing */ 104 u64 bytes_left; 105 106 /* 107 * the end of the ordered extent which is behind it but 108 * didn't update disk_i_size. Please see the comment of 109 * btrfs_ordered_update_i_size(); 110 */ 111 u64 outstanding_isize; 112 113 /* 114 * If we get truncated we need to adjust the file extent we enter for 115 * this ordered extent so that we do not expose stale data. 116 */ 117 u64 truncated_len; 118 119 /* flags (described above) */ 120 unsigned long flags; 121 122 /* compression algorithm */ 123 int compress_type; 124 125 /* Qgroup reserved space */ 126 int qgroup_rsv; 127 128 /* reference count */ 129 refcount_t refs; 130 131 /* the inode we belong to */ 132 struct inode *inode; 133 134 /* list of checksums for insertion when the extent io is done */ 135 struct list_head list; 136 137 /* used for fast fsyncs */ 138 struct list_head log_list; 139 140 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ 141 wait_queue_head_t wait; 142 143 /* our friendly rbtree entry */ 144 struct rb_node rb_node; 145 146 /* a per root list of all the pending ordered extents */ 147 struct list_head root_extent_list; 148 149 struct btrfs_work work; 150 151 struct completion completion; 152 struct btrfs_work flush_work; 153 struct list_head work_list; 154 155 /* 156 * Used to reverse-map physical address returned from ZONE_APPEND write 157 * command in a workqueue context 158 */ 159 u64 physical; 160 struct block_device *bdev; 161 }; 162 163 /* 164 * calculates the total size you need to allocate for an ordered sum 165 * structure spanning 'bytes' in the file 166 */ 167 static inline int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info, 168 unsigned long bytes) 169 { 170 int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize); 171 172 return sizeof(struct btrfs_ordered_sum) + num_sectors * fs_info->csum_size; 173 } 174 175 static inline void 176 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) 177 { 178 spin_lock_init(&t->lock); 179 t->tree = RB_ROOT; 180 t->last = NULL; 181 } 182 183 int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); 184 185 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); 186 void btrfs_remove_ordered_extent(struct btrfs_inode *btrfs_inode, 187 struct btrfs_ordered_extent *entry); 188 void btrfs_mark_ordered_io_finished(struct btrfs_inode *inode, 189 struct page *page, u64 file_offset, 190 u64 num_bytes, bool uptodate); 191 bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode, 192 struct btrfs_ordered_extent **cached, 193 u64 file_offset, u64 io_size); 194 int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset, 195 u64 num_bytes, u64 ram_bytes, u64 disk_bytenr, 196 u64 disk_num_bytes, u64 offset, unsigned flags, 197 int compress_type); 198 void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry, 199 struct btrfs_ordered_sum *sum); 200 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode, 201 u64 file_offset); 202 void btrfs_start_ordered_extent(struct btrfs_ordered_extent *entry, int wait); 203 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len); 204 struct btrfs_ordered_extent * 205 btrfs_lookup_first_ordered_extent(struct btrfs_inode *inode, u64 file_offset); 206 struct btrfs_ordered_extent *btrfs_lookup_first_ordered_range( 207 struct btrfs_inode *inode, u64 file_offset, u64 len); 208 struct btrfs_ordered_extent *btrfs_lookup_ordered_range( 209 struct btrfs_inode *inode, 210 u64 file_offset, 211 u64 len); 212 void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode, 213 struct list_head *list); 214 u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, 215 const u64 range_start, const u64 range_len); 216 void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, 217 const u64 range_start, const u64 range_len); 218 void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start, 219 u64 end, 220 struct extent_state **cached_state); 221 int btrfs_split_ordered_extent(struct btrfs_ordered_extent *ordered, u64 pre, 222 u64 post); 223 int __init ordered_data_init(void); 224 void __cold ordered_data_exit(void); 225 226 #endif 227