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From: Josef Bacik <josef@toxicpanda.com>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 1/7] btrfs: do not allow reservations if we have pending tickets
Date: Fri,  9 Aug 2019 09:33:21 -0400
Message-ID: <20190809133327.26509-2-josef@toxicpanda.com> (raw)
In-Reply-To: <20190809133327.26509-1-josef@toxicpanda.com>

If we already have tickets on the list we don't want to steal their
reservations.  This is a preparation patch for upcoming changes,
technically this shouldn't happen today because of the way we add bytes
to tickets before adding them to the space_info in most cases.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/space-info.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index e9406b2133d1..d671d6476eed 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -938,6 +938,7 @@ static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
 	u64 used;
 	u64 reclaim_bytes = 0;
 	int ret = 0;
+	bool pending_tickets;
 
 	ASSERT(orig_bytes);
 	ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_ALL);
@@ -945,14 +946,17 @@ static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
 	spin_lock(&space_info->lock);
 	ret = -ENOSPC;
 	used = btrfs_space_info_used(space_info, true);
+	pending_tickets = !list_empty(&space_info->tickets) ||
+		!list_empty(&space_info->priority_tickets);
 
 	/*
 	 * Carry on if we have enough space (short-circuit) OR call
 	 * can_overcommit() to ensure we can overcommit to continue.
 	 */
-	if ((used + orig_bytes <= space_info->total_bytes) ||
-	    can_overcommit(fs_info, space_info, orig_bytes, flush,
-			   system_chunk)) {
+	if (!pending_tickets &&
+	    ((used + orig_bytes <= space_info->total_bytes) ||
+	     can_overcommit(fs_info, space_info, orig_bytes, flush,
+			   system_chunk))) {
 		btrfs_space_info_update_bytes_may_use(fs_info, space_info,
 						      orig_bytes);
 		trace_btrfs_space_reservation(fs_info, "space_info",
-- 
2.21.0


  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 13:33 [PATCH 0/7] Rework reserve ticket handling Josef Bacik
2019-08-09 13:33 ` Josef Bacik [this message]
2019-08-09 13:33 ` [PATCH 2/7] btrfs: roll tracepoint into btrfs_space_info_update helper Josef Bacik
2019-08-09 13:33 ` [PATCH 3/7] btrfs: add space reservation tracepoint for reserved bytes Josef Bacik
2019-08-09 13:33 ` [PATCH 4/7] btrfs: rework btrfs_space_info_add_old_bytes Josef Bacik
2019-08-09 13:33 ` [PATCH 5/7] btrfs: refactor the ticket wakeup code Josef Bacik
2019-08-09 13:33 ` [PATCH 6/7] btrfs: rework wake_all_tickets Josef Bacik
2019-08-09 13:33 ` [PATCH 7/7] btrfs: remove orig_bytes from reserve_ticket Josef Bacik

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