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btrfs: don't clear qgroup reserved bit in release_folio

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commit a86805504b88f636a6458520d85afdf0634e3c6b upstream.

The EXTENT_QGROUP_RESERVED bit is used to "lock" regions of the file for
duplicate reservations. That is two writes to that range in one
transaction shouldn't create two reservations, as the reservation will
only be freed once when the write finally goes down. Therefore, it is
never OK to clear that bit without freeing the associated qgroup
reserve. At this point, we don't want to be freeing the reserve, so mask
off the bit.

CC: stable@vger.kernel.org # 5.15+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Boris Burkov 2023-12-01 13:00:12 -08:00 committed by Greg Kroah-Hartman
parent 9b670e1b64
commit 730b3322b8
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent_io.c
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@ -3390,7 +3390,8 @@ static int try_release_extent_state(struct extent_io_tree *tree,
ret = 0;
} else {
u32 clear_bits = ~(EXTENT_LOCKED | EXTENT_NODATASUM |
EXTENT_DELALLOC_NEW | EXTENT_CTLBITS);
EXTENT_DELALLOC_NEW | EXTENT_CTLBITS |
EXTENT_QGROUP_RESERVED);
/*
* At this point we can safely clear everything except the