btrfs: refactor the zoned device handling in cow_file_range

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Handling of the done_offset to cow_file_range is a bit confusing, as
it is not updated at all when the function succeeds, and the -EAGAIN
status is used bother for the case where we need to wait for a zone
finish and the one where the allocation was partially successful.

Change the calling convention so that done_offset is always updated,
and 0 is returned if some allocation was successful (partial allocation
can still only happen for zoned devices), and waiting for a zone
finish is done internally in cow_file_range instead of the caller.

Also write a comment explaining the logic.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>

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Christoph Hellwig 2023-06-28 17:31:41 +02:00 • committed by David Sterba

parent 44962ca37c

commit 6e144bf16b

1 changed files with 31 additions and 27 deletions

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fs/btrfs/inode.c

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