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ext4: add a new helper to check if es must be kept
[ Upstream commit 9649eb1 ] In the extent status tree, we have extents which we can just drop without issues and extents we must not drop - this depends on the extent's status - currently ext4_es_is_delayed() extents must stay, others may be dropped. A helper function is added to help determine if the current extent can be dropped, although only ext4_es_is_delayed() extents cannot be dropped currently. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Baokun Li <libaokun1@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20230424033846.4732-3-libaokun1@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Stable-dep-of: 8e387c8 ("ext4: make sure allocate pending entry not fail") Signed-off-by: Sasha Levin <sashal@kernel.org>
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