This is a note to let you know that I've just added the patch titled
btrfs: add extent allocator hook to decide to allocate chunk or not
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-add-extent-allocator-hook-to-decide-to-allocate-chunk-or-not.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 50475cd57706359d6cc652be88369dace7a4c2eb Mon Sep 17 00:00:00 2001
From: Naohiro Aota <naohiro.aota@xxxxxxx>
Date: Wed, 8 Dec 2021 00:35:48 +0900
Subject: btrfs: add extent allocator hook to decide to allocate chunk or not
From: Naohiro Aota <naohiro.aota@xxxxxxx>
commit 50475cd57706359d6cc652be88369dace7a4c2eb upstream.
Introduce a new hook for an extent allocator policy. With the new
hook, a policy can decide to allocate a new block group or not. If
not, it will return -ENOSPC, so btrfs_reserve_extent() will cut the
allocation size in half and retry the allocation if min_alloc_size is
large enough.
The hook has a place holder and will be replaced with the real
implementation in the next patch.
CC: stable@xxxxxxxxxxxxxxx # 5.16
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3947,6 +3947,19 @@ static void found_extent(struct find_fre
}
}
+static bool can_allocate_chunk(struct btrfs_fs_info *fs_info,
+ struct find_free_extent_ctl *ffe_ctl)
+{
+ switch (ffe_ctl->policy) {
+ case BTRFS_EXTENT_ALLOC_CLUSTERED:
+ return true;
+ case BTRFS_EXTENT_ALLOC_ZONED:
+ return true;
+ default:
+ BUG();
+ }
+}
+
static int chunk_allocation_failed(struct find_free_extent_ctl *ffe_ctl)
{
switch (ffe_ctl->policy) {
@@ -4034,6 +4047,10 @@ static int find_free_extent_update_loop(
struct btrfs_trans_handle *trans;
int exist = 0;
+ /*Check if allocation policy allows to create a new chunk */
+ if (!can_allocate_chunk(fs_info, ffe_ctl))
+ return -ENOSPC;
+
trans = current->journal_info;
if (trans)
exist = 1;
Patches currently in stable-queue which might be from naohiro.aota@xxxxxxx are
queue-5.16/btrfs-zoned-unset-dedicated-block-group-on-allocation-failure.patch
queue-5.16/btrfs-add-extent-allocator-hook-to-decide-to-allocate-chunk-or-not.patch
queue-5.16/btrfs-zoned-fix-chunk-allocation-condition-for-zoned-allocator.patch
queue-5.16/btrfs-zoned-cache-reported-zone-during-mount.patch
