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btrfs: file: reserve qgroup space after the hole punch range is locked 

The incoming qgroup reserved space timing will move the data reservation
to ordered extent completely.

However in btrfs_punch_hole_lock_range() will call
btrfs_invalidate_page(), which will clear QGROUP_RESERVED bit for the
range.

In current stage it's OK, but if we're making ordered extents handle the
reserved space, then btrfs_punch_hole_lock_range() can clear the
QGROUP_RESERVED bit before we submit ordered extent, leading to qgroup
reserved space leakage.

So here change the timing to make reserve data space after
btrfs_punch_hole_lock_range().
The new timing is fine for either current code or the new code.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-06-10 09:04:42 +08:00 committed by David Sterba
parent 9729f10a60
commit a7f8b1c2ac
1 changed files with 4 additions and 4 deletions
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8
fs/btrfs/file.c
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@ -3174,14 +3174,14 @@ reserve_space:
if (ret < 0)
goto out;
space_reserved = true;
ret = btrfs_qgroup_reserve_data(inode, &data_reserved,
alloc_start, bytes_to_reserve);
if (ret)
goto out;
ret = btrfs_punch_hole_lock_range(inode, lockstart, lockend,
&cached_state);
if (ret)
goto out;
ret = btrfs_qgroup_reserve_data(inode, &data_reserved,
alloc_start, bytes_to_reserve);
if (ret)
goto out;
ret = btrfs_prealloc_file_range(inode, mode, alloc_start,
alloc_end - alloc_start,
i_blocksize(inode),