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btrfs: fix may_commit_transaction to deal with no partial filling 

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>
This commit is contained in:
Josef Bacik 2019-08-22 15:11:00 -04:00 committed by David Sterba
parent 2341ccd1bf
commit 00c0135eb8
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/space-info.c
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@ -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)