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scoutfs: reclaim freed metadata blocks in server

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Reclaim freed metadata blocks in the server by merging the stable freed
tree into the allocator as a commit opens and we can trust that the
stable version of the freed allocator in the super is a strict subset of
the allocator's dirty freed tree.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2020-02-25 12:03:46 -08:00
committed by Zach Brown
parent 093f8ead58
commit 76ed627548
1 changed files with 25 additions and 3 deletions
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kmod/src/server.c
+25 -3
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@@ -114,10 +114,19 @@ static void stop_server(struct server_info *server)
* current commit and prevents the commit worker from acquiring the
* exclusive write lock to write the commit. This can fail for the
* first holder failing to prepare a new commit.
*
* We reclaim the server's stable meta_freed blocks. This is run before
* anything has modified allocators in the server. We know that the
* stable meta_freed tree in the super contains all the stable free
* blocks which can be merged back into avail. We reference the stable
* freed tree in the super because the server allocator's freed tree is
* going to be added to as blocks are freed during the merge.
*/
static int hold_commit(struct super_block *sb)
{
struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
DECLARE_SERVER_INFO(sb, server);
u64 tot;
int ret = 0;
down_read(&server->commit_rwsem);
@@ -126,12 +135,25 @@ static int hold_commit(struct super_block *sb)
up_read(&server->commit_rwsem);
down_write(&server->commit_rwsem);
server->prepared_commit = true;
ret = 0;
if (!server->prepared_commit) {
BUG_ON(scoutfs_block_writer_dirty_bytes(sb,
&server->wri));
tot = le64_to_cpu(super->core_meta_freed.ref.sm_total);
ret = scoutfs_radix_merge(sb, &server->alloc,
&server->wri,
&server->alloc.avail,
&server->alloc.freed,
&super->core_meta_freed,
true, tot);
if (ret == 0)
server->prepared_commit = true;
}
up_write(&server->commit_rwsem);
if (ret)
if (ret < 0)
break;
down_read(&server->commit_rwsem);
}