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 #include <linux/types.h> 10 #include <linux/list.h> 11 #include <linux/refcount.h> 12 #include <linux/completion.h> 13 #include <linux/rbtree.h> 14 #include <linux/wait.h> 15 #include "async-thread.h" 16 17 struct inode; 18 struct page; 19 struct extent_state; 20 struct btrfs_inode; 21 struct btrfs_root; 22 struct btrfs_fs_info; 23 24 struct btrfs_ordered_sum { 25 /* 26 * Logical start address and length for of the blocks covered by 27 * the sums array. 28 */ 29 u64 logical; 30 u32 len; 31 32 struct list_head list; 33 /* last field is a variable length array of csums */ 34 u8 sums[]; 35 }; 36 37 /* 38 * Bits for btrfs_ordered_extent::flags. 39 * 40 * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written. 41 * It is used to make sure metadata is inserted into the tree only once 42 * per extent. 43 * 44 * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the 45 * rbtree, just before waking any waiters. It is used to indicate the 46 * IO is done and any metadata is inserted into the tree. 47 */ 48 enum { 49 /* 50 * Different types for ordered extents, one and only one of the 4 types 51 * need to be set when creating ordered extent. 52 * 53 * REGULAR: For regular non-compressed COW write 54 * NOCOW: For NOCOW write into existing non-hole extent 55 * PREALLOC: For NOCOW write into preallocated extent 56 * COMPRESSED: For compressed COW write 57 */ 58 BTRFS_ORDERED_REGULAR, 59 BTRFS_ORDERED_NOCOW, 60 BTRFS_ORDERED_PREALLOC, 61 BTRFS_ORDERED_COMPRESSED, 62 63 /* 64 * Extra bit for direct io, can only be set for 65 * REGULAR/NOCOW/PREALLOC. No direct io for compressed extent. 66 */ 67 BTRFS_ORDERED_DIRECT, 68 69 /* Extra status bits for ordered extents */ 70 71 /* set when all the pages are written */ 72 BTRFS_ORDERED_IO_DONE, 73 /* set when removed from the tree */ 74 BTRFS_ORDERED_COMPLETE, 75 /* We had an io error when writing this out */ 76 BTRFS_ORDERED_IOERR, 77 /* Set when we have to truncate an extent */ 78 BTRFS_ORDERED_TRUNCATED, 79 /* Used during fsync to track already logged extents */ 80 BTRFS_ORDERED_LOGGED, 81 /* We have already logged all the csums of the ordered extent */ 82 BTRFS_ORDERED_LOGGED_CSUM, 83 /* We wait for this extent to complete in the current transaction */ 84 BTRFS_ORDERED_PENDING, 85 /* BTRFS_IOC_ENCODED_WRITE */ 86 BTRFS_ORDERED_ENCODED, 87 }; 88 89 /* BTRFS_ORDERED_* flags that specify the type of the extent. */ 90 #define BTRFS_ORDERED_TYPE_FLAGS ((1UL << BTRFS_ORDERED_REGULAR) | \ 91 (1UL << BTRFS_ORDERED_NOCOW) | \ 92 (1UL << BTRFS_ORDERED_PREALLOC) | \ 93 (1UL << BTRFS_ORDERED_COMPRESSED) | \ 94 (1UL << BTRFS_ORDERED_DIRECT) | \ 95 (1UL << BTRFS_ORDERED_ENCODED)) 96 97 struct btrfs_ordered_extent { 98 /* logical offset in the file */ 99 u64 file_offset; 100 101 /* 102 * These fields directly correspond to the same fields in 103 * btrfs_file_extent_item. 104 */ 105 u64 num_bytes; 106 u64 ram_bytes; 107 u64 disk_bytenr; 108 u64 disk_num_bytes; 109 u64 offset; 110 111 /* number of bytes that still need writing */ 112 u64 bytes_left; 113 114 /* 115 * If we get truncated we need to adjust the file extent we enter for 116 * this ordered extent so that we do not expose stale data. 117 */ 118 u64 truncated_len; 119 120 /* flags (described above) */ 121 unsigned long flags; 122 123 /* compression algorithm */ 124 int compress_type; 125 126 /* Qgroup reserved space */ 127 int qgroup_rsv; 128 129 /* reference count */ 130 refcount_t refs; 131 132 /* the inode we belong to */ 133 struct btrfs_inode *inode; 134 135 /* list of checksums for insertion when the extent io is done */ 136 struct list_head list; 137 138 /* used for fast fsyncs */ 139 struct list_head log_list; 140 141 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ 142 wait_queue_head_t wait; 143 144 /* our friendly rbtree entry */ 145 struct rb_node rb_node; 146 147 /* a per root list of all the pending ordered extents */ 148 struct list_head root_extent_list; 149 150 struct btrfs_work work; 151 152 struct completion completion; 153 struct btrfs_work flush_work; 154 struct list_head work_list; 155 156 struct list_head bioc_list; 157 }; 158 159 int btrfs_finish_one_ordered(struct btrfs_ordered_extent *ordered_extent); 160 int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); 161 162 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); 163 void btrfs_remove_ordered_extent(struct btrfs_inode *btrfs_inode, 164 struct btrfs_ordered_extent *entry); 165 void btrfs_finish_ordered_extent(struct btrfs_ordered_extent *ordered, 166 struct page *page, u64 file_offset, u64 len, 167 bool uptodate); 168 void btrfs_mark_ordered_io_finished(struct btrfs_inode *inode, 169 struct page *page, u64 file_offset, 170 u64 num_bytes, bool uptodate); 171 bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode, 172 struct btrfs_ordered_extent **cached, 173 u64 file_offset, u64 io_size); 174 175 /* 176 * This represents details about the target file extent item of a write operation. 177 */ 178 struct btrfs_file_extent { 179 u64 disk_bytenr; 180 u64 disk_num_bytes; 181 u64 num_bytes; 182 u64 ram_bytes; 183 u64 offset; 184 u8 compression; 185 }; 186 187 struct btrfs_ordered_extent *btrfs_alloc_ordered_extent( 188 struct btrfs_inode *inode, u64 file_offset, 189 const struct btrfs_file_extent *file_extent, unsigned long flags); 190 void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry, 191 struct btrfs_ordered_sum *sum); 192 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode, 193 u64 file_offset); 194 void btrfs_start_ordered_extent(struct btrfs_ordered_extent *entry); 195 int btrfs_wait_ordered_range(struct btrfs_inode *inode, u64 start, u64 len); 196 struct btrfs_ordered_extent * 197 btrfs_lookup_first_ordered_extent(struct btrfs_inode *inode, u64 file_offset); 198 struct btrfs_ordered_extent *btrfs_lookup_first_ordered_range( 199 struct btrfs_inode *inode, u64 file_offset, u64 len); 200 struct btrfs_ordered_extent *btrfs_lookup_ordered_range( 201 struct btrfs_inode *inode, 202 u64 file_offset, 203 u64 len); 204 void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode, 205 struct list_head *list); 206 u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, 207 const struct btrfs_block_group *bg); 208 void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, 209 const struct btrfs_block_group *bg); 210 void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start, 211 u64 end, 212 struct extent_state **cached_state); 213 bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end, 214 struct extent_state **cached_state); 215 struct btrfs_ordered_extent *btrfs_split_ordered_extent( 216 struct btrfs_ordered_extent *ordered, u64 len); 217 void btrfs_mark_ordered_extent_error(struct btrfs_ordered_extent *ordered); 218 int __init ordered_data_init(void); 219 void __cold ordered_data_exit(void); 220 221 #endif 222