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bcachefs: Start gc, copygc, rebalance threads after initing writes ref

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This fixes a bug where copygc would occasionally race with going
read-write and die, thinking we were read only, because it couldn't take
a ref on c->writes.

It's not necessary for copygc (or rebalance, or copygc) to take write
refs; they could run with BCH_TRANS_COMMIT_nocheck_rw, but this is an
easier fix that making sure that flag is passed correctly everywhere.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2023-11-24 00:55:59 -05:00
parent 202a7c292e
commit 468035ca4b
1 changed files with 16 additions and 12 deletions
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28
fs/bcachefs/super.c
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@@ -423,6 +423,18 @@ static int __bch2_fs_read_write(struct bch_fs *c, bool early)
bch2_dev_allocator_add(c, ca);
bch2_recalc_capacity(c);
set_bit(BCH_FS_RW, &c->flags);
set_bit(BCH_FS_WAS_RW, &c->flags);
#ifndef BCH_WRITE_REF_DEBUG
percpu_ref_reinit(&c->writes);
#else
for (i = 0; i < BCH_WRITE_REF_NR; i++) {
BUG_ON(atomic_long_read(&c->writes[i]));
atomic_long_inc(&c->writes[i]);
}
#endif
ret = bch2_gc_thread_start(c);
if (ret) {
bch_err(c, "error starting gc thread");
@@ -439,24 +451,16 @@ static int __bch2_fs_read_write(struct bch_fs *c, bool early)
goto err;
}
#ifndef BCH_WRITE_REF_DEBUG
percpu_ref_reinit(&c->writes);
#else
for (i = 0; i < BCH_WRITE_REF_NR; i++) {
BUG_ON(atomic_long_read(&c->writes[i]));
atomic_long_inc(&c->writes[i]);
}
#endif
set_bit(BCH_FS_RW, &c->flags);
set_bit(BCH_FS_WAS_RW, &c->flags);
bch2_do_discards(c);
bch2_do_invalidates(c);
bch2_do_stripe_deletes(c);
bch2_do_pending_node_rewrites(c);
return 0;
err:
__bch2_fs_read_only(c);
if (test_bit(BCH_FS_RW, &c->flags))
bch2_fs_read_only(c);
else
__bch2_fs_read_only(c);
return ret;
}