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Btrfs: account for crcs in delayed ref processing

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As we delete large extents, we end up doing huge amounts of COW in order
to delete the corresponding crcs.  This adds accounting so that we keep
track of that space and flushing of delayed refs so that we don't build
up too much delayed crc work.

This helps limit the delayed work that must be done at commit time and
tries to avoid ENOSPC aborts because the crcs eat all the global
reserves.

Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik
2015-02-03 07:50:16 -08:00
committed by Chris Mason
parent 28ed1345a5
commit 1262133b8d
5 changed files with 83 additions and 24 deletions
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4
fs/btrfs/transaction.c
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@@ -64,6 +64,9 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction)
if (atomic_dec_and_test(&transaction->use_count)) {
BUG_ON(!list_empty(&transaction->list));
WARN_ON(!RB_EMPTY_ROOT(&transaction->delayed_refs.href_root));
if (transaction->delayed_refs.pending_csums)
printk(KERN_ERR "pending csums is %llu\n",
transaction->delayed_refs.pending_csums);
while (!list_empty(&transaction->pending_chunks)) {
struct extent_map *em;
@@ -223,6 +226,7 @@ loop:
cur_trans->delayed_refs.href_root = RB_ROOT;
atomic_set(&cur_trans->delayed_refs.num_entries, 0);
cur_trans->delayed_refs.num_heads_ready = 0;
cur_trans->delayed_refs.pending_csums = 0;
cur_trans->delayed_refs.num_heads = 0;
cur_trans->delayed_refs.flushing = 0;
cur_trans->delayed_refs.run_delayed_start = 0;