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 u32 sums[]; 27 }; 28 29 /* 30 * bits for the flags field: 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 /* set when all the pages are written */ 42 BTRFS_ORDERED_IO_DONE, 43 /* set when removed from the tree */ 44 BTRFS_ORDERED_COMPLETE, 45 /* set when we want to write in place */ 46 BTRFS_ORDERED_NOCOW, 47 /* writing a zlib compressed extent */ 48 BTRFS_ORDERED_COMPRESSED, 49 /* set when writing to preallocated extent */ 50 BTRFS_ORDERED_PREALLOC, 51 /* set when we're doing DIO with this extent */ 52 BTRFS_ORDERED_DIRECT, 53 /* We had an io error when writing this out */ 54 BTRFS_ORDERED_IOERR, 55 /* 56 * indicates whether this ordered extent has done its due diligence in 57 * updating the isize 58 */ 59 BTRFS_ORDERED_UPDATED_ISIZE, 60 /* Set when we have to truncate an extent */ 61 BTRFS_ORDERED_TRUNCATED, 62 /* Regular IO for COW */ 63 BTRFS_ORDERED_REGULAR, 64 }; 65 66 struct btrfs_ordered_extent { 67 /* logical offset in the file */ 68 u64 file_offset; 69 70 /* disk byte number */ 71 u64 start; 72 73 /* ram length of the extent in bytes */ 74 u64 len; 75 76 /* extent length on disk */ 77 u64 disk_len; 78 79 /* number of bytes that still need writing */ 80 u64 bytes_left; 81 82 /* 83 * the end of the ordered extent which is behind it but 84 * didn't update disk_i_size. Please see the comment of 85 * btrfs_ordered_update_i_size(); 86 */ 87 u64 outstanding_isize; 88 89 /* 90 * If we get truncated we need to adjust the file extent we enter for 91 * this ordered extent so that we do not expose stale data. 92 */ 93 u64 truncated_len; 94 95 /* flags (described above) */ 96 unsigned long flags; 97 98 /* compression algorithm */ 99 int compress_type; 100 101 /* reference count */ 102 refcount_t refs; 103 104 /* the inode we belong to */ 105 struct inode *inode; 106 107 /* list of checksums for insertion when the extent io is done */ 108 struct list_head list; 109 110 /* If we need to wait on this to be done */ 111 struct list_head log_list; 112 113 /* If the transaction needs to wait on this ordered extent */ 114 struct list_head trans_list; 115 116 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ 117 wait_queue_head_t wait; 118 119 /* our friendly rbtree entry */ 120 struct rb_node rb_node; 121 122 /* a per root list of all the pending ordered extents */ 123 struct list_head root_extent_list; 124 125 struct btrfs_work work; 126 127 struct completion completion; 128 struct btrfs_work flush_work; 129 struct list_head work_list; 130 }; 131 132 /* 133 * calculates the total size you need to allocate for an ordered sum 134 * structure spanning 'bytes' in the file 135 */ 136 static inline int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info, 137 unsigned long bytes) 138 { 139 int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize); 140 int csum_size = btrfs_super_csum_size(fs_info->super_copy); 141 142 return sizeof(struct btrfs_ordered_sum) + num_sectors * csum_size; 143 } 144 145 static inline void 146 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) 147 { 148 spin_lock_init(&t->lock); 149 t->tree = RB_ROOT; 150 t->last = NULL; 151 } 152 153 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); 154 void btrfs_remove_ordered_extent(struct inode *inode, 155 struct btrfs_ordered_extent *entry); 156 int btrfs_dec_test_ordered_pending(struct inode *inode, 157 struct btrfs_ordered_extent **cached, 158 u64 file_offset, u64 io_size, int uptodate); 159 int btrfs_dec_test_first_ordered_pending(struct inode *inode, 160 struct btrfs_ordered_extent **cached, 161 u64 *file_offset, u64 io_size, 162 int uptodate); 163 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, 164 u64 start, u64 len, u64 disk_len, int type); 165 int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset, 166 u64 start, u64 len, u64 disk_len, int type); 167 int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset, 168 u64 start, u64 len, u64 disk_len, 169 int type, int compress_type); 170 void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry, 171 struct btrfs_ordered_sum *sum); 172 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, 173 u64 file_offset); 174 void btrfs_start_ordered_extent(struct inode *inode, 175 struct btrfs_ordered_extent *entry, int wait); 176 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len); 177 struct btrfs_ordered_extent * 178 btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset); 179 struct btrfs_ordered_extent *btrfs_lookup_ordered_range( 180 struct btrfs_inode *inode, 181 u64 file_offset, 182 u64 len); 183 int btrfs_ordered_update_i_size(struct inode *inode, u64 offset, 184 struct btrfs_ordered_extent *ordered); 185 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, 186 u32 *sum, int len); 187 u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr, 188 const u64 range_start, const u64 range_len); 189 u64 btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr, 190 const u64 range_start, const u64 range_len); 191 int __init ordered_data_init(void); 192 void __cold ordered_data_exit(void); 193 194 #endif 195