This is a note to let you know that I've just added the patch titled
btrfs: zoned: use regular writes for relocation
to the 5.15-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-zoned-use-regular-writes-for-relocation.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Nov 19 01:33:42 PM CET 2021
From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Date: Thu, 18 Nov 2021 17:58:16 +0900
Subject: btrfs: zoned: use regular writes for relocation
To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-btrfs@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx, Naohiro Aota <naohiro.aota@xxxxxxx>, David Sterba <dsterba@xxxxxxxx>, Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Message-ID: <a6aa5997187d6e0172652cc29aea76be851c4cf6.1637225333.git.johannes.thumshirn@xxxxxxx>
From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
commit e6d261e3b1f777b499ce8f535ed44dd1b69278b7 upstream
Now that we have a dedicated block group for relocation, we can use
REQ_OP_WRITE instead of REQ_OP_ZONE_APPEND for writing out the data on
relocation.
Reviewed-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/zoned.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1304,6 +1304,17 @@ bool btrfs_use_zone_append(struct btrfs_
if (!is_data_inode(&inode->vfs_inode))
return false;
+ /*
+ * Using REQ_OP_ZONE_APPNED for relocation can break assumptions on the
+ * extent layout the relocation code has.
+ * Furthermore we have set aside own block-group from which only the
+ * relocation "process" can allocate and make sure only one process at a
+ * time can add pages to an extent that gets relocated, so it's safe to
+ * use regular REQ_OP_WRITE for this special case.
+ */
+ if (btrfs_is_data_reloc_root(inode->root))
+ return false;
+
cache = btrfs_lookup_block_group(fs_info, start);
ASSERT(cache);
if (!cache)
Patches currently in stable-queue which might be from johannes.thumshirn@xxxxxxx are
queue-5.15/btrfs-zoned-add-a-dedicated-data-relocation-block-group.patch
queue-5.15/btrfs-check-for-relocation-inodes-on-zoned-btrfs-in-should_nocow.patch
queue-5.15/btrfs-zoned-use-regular-writes-for-relocation.patch
queue-5.15/btrfs-introduce-btrfs_is_data_reloc_root.patch
queue-5.15/btrfs-zoned-allow-preallocation-for-relocation-inodes.patch
queue-5.15/btrfs-zoned-only-allow-one-process-to-add-pages-to-a-relocation-inode.patch
