git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/logged_ops.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "bcachefs.h"
   4 #include "bkey_buf.h"
   5 #include "btree_update.h"
   6 #include "error.h"
   7 #include "io_misc.h"
   8 #include "logged_ops.h"
   9 #include "super.h"
  10
  11 struct bch_logged_op_fn {
  12         u8              type;
  13         int             (*resume)(struct btree_trans *, struct bkey_i *);
  14 };
  15
  16 static const struct bch_logged_op_fn logged_op_fns[] = {
  17 #define x(n)            {                                       \
  18         .type           = KEY_TYPE_logged_op_##n,               \
  19         .resume         = bch2_resume_logged_op_##n,            \
  20 },
  21         BCH_LOGGED_OPS()
  22 #undef x
  23 };
  24
  25 static const struct bch_logged_op_fn *logged_op_fn(enum bch_bkey_type type)
  26 {
  27         for (unsigned i = 0; i < ARRAY_SIZE(logged_op_fns); i++)
  28                 if (logged_op_fns[i].type == type)
  29                         return logged_op_fns + i;
  30         return NULL;
  31 }
  32
  33 static int resume_logged_op(struct btree_trans *trans, struct btree_iter *iter,
  34                             struct bkey_s_c k)
  35 {
  36         struct bch_fs *c = trans->c;
  37         const struct bch_logged_op_fn *fn = logged_op_fn(k.k->type);
  38         struct bkey_buf sk;
  39         u32 restart_count = trans->restart_count;
  40         int ret;
  41
  42         if (!fn)
  43                 return 0;
  44
  45         bch2_bkey_buf_init(&sk);
  46         bch2_bkey_buf_reassemble(&sk, c, k);
  47
  48         ret =   drop_locks_do(trans, (bch2_fs_lazy_rw(c), 0)) ?:
  49                 fn->resume(trans, sk.k) ?: trans_was_restarted(trans, restart_count);
  50
  51         bch2_bkey_buf_exit(&sk, c);
  52         return ret;
  53 }
  54
  55 int bch2_resume_logged_ops(struct bch_fs *c)
  56 {
  57         struct btree_iter iter;
  58         struct bkey_s_c k;
  59         int ret;
  60
  61         ret = bch2_trans_run(c,
  62                 for_each_btree_key2(trans, iter,
  63                                 BTREE_ID_logged_ops, POS_MIN, BTREE_ITER_PREFETCH, k,
  64                         resume_logged_op(trans, &iter, k)));
  65         if (ret)
  66                 bch_err_fn(c, ret);
  67         return ret;
  68 }
  69
  70 static int __bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k)
  71 {
  72         struct btree_iter iter;
  73         int ret;
  74
  75         ret = bch2_bkey_get_empty_slot(trans, &iter, BTREE_ID_logged_ops, POS_MAX);
  76         if (ret)
  77                 return ret;
  78
  79         k->k.p = iter.pos;
  80
  81         ret = bch2_trans_update(trans, &iter, k, 0);
  82         bch2_trans_iter_exit(trans, &iter);
  83         return ret;
  84 }
  85
  86 int bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k)
  87 {
  88         return commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
  89                          __bch2_logged_op_start(trans, k));
  90 }
  91
  92 void bch2_logged_op_finish(struct btree_trans *trans, struct bkey_i *k)
  93 {
  94         int ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
  95                             bch2_btree_delete(trans, BTREE_ID_logged_ops, k->k.p, 0));
  96         /*
  97          * This needs to be a fatal error because we've left an unfinished
  98          * operation in the logged ops btree.
  99          *
 100          * We should only ever see an error here if the filesystem has already
 101          * been shut down, but make sure of that here:
 102          */
 103         if (ret) {
 104                 struct bch_fs *c = trans->c;
 105                 struct printbuf buf = PRINTBUF;
 106
 107                 bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(k));
 108                 bch2_fs_fatal_error(c, "%s: error deleting logged operation %s: %s",
 109                                      __func__, buf.buf, bch2_err_str(ret));
 110                 printbuf_exit(&buf);
 111         }
 112 }