git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/io_types.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_IO_TYPES_H
   3 #define _BCACHEFS_IO_TYPES_H
   4
   5 #include "alloc_types.h"
   6 #include "btree_types.h"
   7 #include "buckets_types.h"
   8 #include "extents_types.h"
   9 #include "keylist_types.h"
  10 #include "opts.h"
  11 #include "super_types.h"
  12
  13 #include <linux/llist.h>
  14 #include <linux/workqueue.h>
  15
  16 struct bch_read_bio {
  17         struct bch_fs           *c;
  18         u64                     start_time;
  19         u64                     submit_time;
  20
  21         /*
  22          * Reads will often have to be split, and if the extent being read from
  23          * was checksummed or compressed we'll also have to allocate bounce
  24          * buffers and copy the data back into the original bio.
  25          *
  26          * If we didn't have to split, we have to save and restore the original
  27          * bi_end_io - @split below indicates which:
  28          */
  29         union {
  30         struct bch_read_bio     *parent;
  31         bio_end_io_t            *end_io;
  32         };
  33
  34         /*
  35          * Saved copy of bio->bi_iter, from submission time - allows us to
  36          * resubmit on IO error, and also to copy data back to the original bio
  37          * when we're bouncing:
  38          */
  39         struct bvec_iter        bvec_iter;
  40
  41         unsigned                offset_into_extent;
  42
  43         u16                     flags;
  44         union {
  45         struct {
  46         u16                     bounce:1,
  47                                 split:1,
  48                                 kmalloc:1,
  49                                 have_ioref:1,
  50                                 narrow_crcs:1,
  51                                 hole:1,
  52                                 retry:2,
  53                                 context:2;
  54         };
  55         u16                     _state;
  56         };
  57
  58         struct bch_devs_list    devs_have;
  59
  60         struct extent_ptr_decoded pick;
  61
  62         /*
  63          * pos we read from - different from data_pos for indirect extents:
  64          */
  65         struct bpos             read_pos;
  66
  67         /*
  68          * start pos of data we read (may not be pos of data we want) - for
  69          * promote, narrow extents paths:
  70          */
  71         enum btree_id           data_btree;
  72         struct bpos             data_pos;
  73         struct bversion         version;
  74
  75         struct promote_op       *promote;
  76
  77         struct bch_io_opts      opts;
  78
  79         struct work_struct      work;
  80
  81         struct bio              bio;
  82 };
  83
  84 struct bch_write_bio {
  85         struct bch_fs           *c;
  86         struct bch_write_bio    *parent;
  87
  88         u64                     submit_time;
  89
  90         struct bch_devs_list    failed;
  91         u8                      dev;
  92
  93         unsigned                split:1,
  94                                 bounce:1,
  95                                 put_bio:1,
  96                                 have_ioref:1,
  97                                 used_mempool:1,
  98                                 first_btree_write:1;
  99
 100         struct bio              bio;
 101 };
 102
 103 struct bch_write_op {
 104         struct closure          cl;
 105         struct bch_fs           *c;
 106         void                    (*end_io)(struct bch_write_op *);
 107         u64                     start_time;
 108
 109         unsigned                written; /* sectors */
 110         u16                     flags;
 111         s16                     error; /* dio write path expects it to hold -ERESTARTSYS... */
 112
 113         unsigned                csum_type:4;
 114         unsigned                compression_type:4;
 115         unsigned                nr_replicas:4;
 116         unsigned                nr_replicas_required:4;
 117         unsigned                alloc_reserve:3;
 118         unsigned                incompressible:1;
 119
 120         struct bch_devs_list    devs_have;
 121         u16                     target;
 122         u16                     nonce;
 123         struct bch_io_opts      opts;
 124
 125         struct bpos             pos;
 126         struct bversion         version;
 127
 128         /* For BCH_WRITE_DATA_ENCODED: */
 129         struct bch_extent_crc_unpacked crc;
 130
 131         struct write_point_specifier write_point;
 132
 133         struct disk_reservation res;
 134
 135         struct open_buckets     open_buckets;
 136
 137         /*
 138          * If caller wants to flush but hasn't passed us a journal_seq ptr, we
 139          * still need to stash the journal_seq somewhere:
 140          */
 141         union {
 142                 u64                     *journal_seq_p;
 143                 u64                     journal_seq;
 144         };
 145         u64                     new_i_size;
 146         s64                     i_sectors_delta;
 147
 148         int                     (*index_update_fn)(struct bch_write_op *);
 149
 150         struct bch_devs_mask    failed;
 151
 152         struct keylist          insert_keys;
 153         u64                     inline_keys[BKEY_EXTENT_U64s_MAX * 2];
 154
 155         /* Must be last: */
 156         struct bch_write_bio    wbio;
 157 };
 158
 159 #endif /* _BCACHEFS_IO_TYPES_H */