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btrfs: set cache_block_group_error if we find an error

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commit 92fb94b69c upstream.

We set cache_block_group_error if btrfs_cache_block_group() returns an
error, this is because we could end up not finding space to allocate and
mistakenly return -ENOSPC, and which could then abort the transaction
with the incorrect errno, and in the case of ENOSPC result in a
WARN_ON() that will trip up tests like generic/475.

However there's the case where multiple threads can be racing, one
thread gets the proper error, and the other thread doesn't actually call
btrfs_cache_block_group(), it instead sees ->cached ==
BTRFS_CACHE_ERROR.  Again the result is the same, we fail to allocate
our space and return -ENOSPC.  Instead we need to set
cache_block_group_error to -EIO in this case to make sure that if we do
not make our allocation we get the appropriate error returned back to
the caller.

CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josef Bacik 2023-08-02 09:20:24 -04:00 • committed by Justin Hammond
parent d9bb05182e
commit 639d43fff2
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/extent-tree.c
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@ -4334,8 +4334,11 @@ have_block_group:
ret = 0;
}
if (unlikely(block_group->cached == BTRFS_CACHE_ERROR))
if (unlikely(block_group->cached == BTRFS_CACHE_ERROR)) {
if (!cache_block_group_error)
cache_block_group_error = -EIO;
goto loop;
}
bg_ret = NULL;
ret = do_allocation(block_group, &ffe_ctl, &bg_ret);