From: Josef Bacik <josef@toxicpanda.com>
Date: Thu, 22 Aug 2019 15:11:00 -0400
Subject: btrfs: fix may_commit_transaction to deal with no partial filling
Git-commit: 00c0135eb8b8172de48e1accbb09ebfa3aa8bf25
Patch-mainline: v5.4-rc1
References: bsc#1141456
Now that we aren't partially filling tickets we may have some slack
space left in the space_info. We need to account for this in
may_commit_transaction, otherwise we may choose to not commit the
transaction despite it actually having enough space to satisfy our
ticket.
Calculate the free space we have in the space_info, if any, and subtract
this from the ticket we have and use that amount to determine if we will
need to commit to reclaim enough space.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
fs/btrfs/space-info.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index eb4a926ea7b9..3ab7a4810bef 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -473,12 +473,19 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans;
u64 bytes_needed;
u64 reclaim_bytes = 0;
+ u64 cur_free_bytes = 0;
trans = (struct btrfs_trans_handle *)current->journal_info;
if (trans)
return -EAGAIN;
spin_lock(&space_info->lock);
+ cur_free_bytes = btrfs_space_info_used(space_info, true);
+ if (cur_free_bytes < space_info->total_bytes)
+ cur_free_bytes = space_info->total_bytes - cur_free_bytes;
+ else
+ cur_free_bytes = 0;
+
if (!list_empty(&space_info->priority_tickets))
ticket = list_first_entry(&space_info->priority_tickets,
struct reserve_ticket, list);
@@ -486,6 +493,11 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info,
ticket = list_first_entry(&space_info->tickets,
struct reserve_ticket, list);
bytes_needed = (ticket) ? ticket->bytes : 0;
+
+ if (bytes_needed > cur_free_bytes)
+ bytes_needed -= cur_free_bytes;
+ else
+ bytes_needed = 0;
spin_unlock(&space_info->lock);
if (!bytes_needed)