fs/btrfs/ordered-data.h

   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 #define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
  41
  42 #define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
  43
  44 #define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
  45
  46 #define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
  47
  48 #define BTRFS_ORDERED_PREALLOC 4 /* set when writing to preallocated extent */
  49
  50 #define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
  51
  52 #define BTRFS_ORDERED_IOERR 6 /* We had an io error when writing this out */
  53
  54 #define BTRFS_ORDERED_UPDATED_ISIZE 7 /* indicates whether this ordered extent
  55                                        * has done its due diligence in updating
  56                                        * the isize. */
  57 #define BTRFS_ORDERED_LOGGED_CSUM 8 /* We've logged the csums on this ordered
  58                                        ordered extent */
  59 #define BTRFS_ORDERED_TRUNCATED 9 /* Set when we have to truncate an extent */
  60
  61 #define BTRFS_ORDERED_LOGGED 10 /* Set when we've waited on this ordered extent
  62                                  * in the logging code. */
  63 #define BTRFS_ORDERED_PENDING 11 /* We are waiting for this ordered extent to
  64                                   * complete in the current transaction. */
  65 #define BTRFS_ORDERED_REGULAR 12 /* Regular IO for COW */
  66
  67 struct btrfs_ordered_extent {
  68         /* logical offset in the file */
  69         u64 file_offset;
  70
  71         /* disk byte number */
  72         u64 start;
  73
  74         /* ram length of the extent in bytes */
  75         u64 len;
  76
  77         /* extent length on disk */
  78         u64 disk_len;
  79
  80         /* number of bytes that still need writing */
  81         u64 bytes_left;
  82
  83         /*
  84          * the end of the ordered extent which is behind it but
  85          * didn't update disk_i_size. Please see the comment of
  86          * btrfs_ordered_update_i_size();
  87          */
  88         u64 outstanding_isize;
  89
  90         /*
  91          * If we get truncated we need to adjust the file extent we enter for
  92          * this ordered extent so that we do not expose stale data.
  93          */
  94         u64 truncated_len;
  95
  96         /* flags (described above) */
  97         unsigned long flags;
  98
  99         /* compression algorithm */
 100         int compress_type;
 101
 102         /* reference count */
 103         refcount_t refs;
 104
 105         /* the inode we belong to */
 106         struct inode *inode;
 107
 108         /* list of checksums for insertion when the extent io is done */
 109         struct list_head list;
 110
 111         /* If we need to wait on this to be done */
 112         struct list_head log_list;
 113
 114         /* If the transaction needs to wait on this ordered extent */
 115         struct list_head trans_list;
 116
 117         /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
 118         wait_queue_head_t wait;
 119
 120         /* our friendly rbtree entry */
 121         struct rb_node rb_node;
 122
 123         /* a per root list of all the pending ordered extents */
 124         struct list_head root_extent_list;
 125
 126         struct btrfs_work work;
 127
 128         struct completion completion;
 129         struct btrfs_work flush_work;
 130         struct list_head work_list;
 131 };
 132
 133 /*
 134  * calculates the total size you need to allocate for an ordered sum
 135  * structure spanning 'bytes' in the file
 136  */
 137 static inline int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info,
 138                                          unsigned long bytes)
 139 {
 140         int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize);
 141         int csum_size = btrfs_super_csum_size(fs_info->super_copy);
 142
 143         return sizeof(struct btrfs_ordered_sum) + num_sectors * csum_size;
 144 }
 145
 146 static inline void
 147 btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
 148 {
 149         spin_lock_init(&t->lock);
 150         t->tree = RB_ROOT;
 151         t->last = NULL;
 152 }
 153
 154 void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
 155 void btrfs_remove_ordered_extent(struct inode *inode,
 156                                 struct btrfs_ordered_extent *entry);
 157 int btrfs_dec_test_ordered_pending(struct inode *inode,
 158                                    struct btrfs_ordered_extent **cached,
 159                                    u64 file_offset, u64 io_size, int uptodate);
 160 int btrfs_dec_test_first_ordered_pending(struct inode *inode,
 161                                    struct btrfs_ordered_extent **cached,
 162                                    u64 *file_offset, u64 io_size,
 163                                    int uptodate);
 164 int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
 165                              u64 start, u64 len, u64 disk_len, int type);
 166 int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
 167                                  u64 start, u64 len, u64 disk_len, int type);
 168 int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
 169                                       u64 start, u64 len, u64 disk_len,
 170                                       int type, int compress_type);
 171 void btrfs_add_ordered_sum(struct inode *inode,
 172                            struct btrfs_ordered_extent *entry,
 173                            struct btrfs_ordered_sum *sum);
 174 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
 175                                                          u64 file_offset);
 176 void btrfs_start_ordered_extent(struct inode *inode,
 177                                 struct btrfs_ordered_extent *entry, int wait);
 178 int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
 179 struct btrfs_ordered_extent *
 180 btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
 181 struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
 182                 struct btrfs_inode *inode,
 183                 u64 file_offset,
 184                 u64 len);
 185 bool btrfs_have_ordered_extents_in_range(struct inode *inode,
 186                                          u64 file_offset,
 187                                          u64 len);
 188 int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
 189                                 struct btrfs_ordered_extent *ordered);
 190 int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
 191                            u32 *sum, int len);
 192 u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
 193                                const u64 range_start, const u64 range_len);
 194 u64 btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
 195                               const u64 range_start, const u64 range_len);
 196 void btrfs_get_logged_extents(struct btrfs_inode *inode,
 197                               struct list_head *logged_list,
 198                               const loff_t start,
 199                               const loff_t end);
 200 void btrfs_put_logged_extents(struct list_head *logged_list);
 201 void btrfs_submit_logged_extents(struct list_head *logged_list,
 202                                  struct btrfs_root *log);
 203 void btrfs_wait_logged_extents(struct btrfs_trans_handle *trans,
 204                                struct btrfs_root *log, u64 transid);
 205 void btrfs_free_logged_extents(struct btrfs_root *log, u64 transid);
 206 int __init ordered_data_init(void);
 207 void __cold ordered_data_exit(void);
 208
 209 #endif