btrfs: document more parameters of submit_extent_page
Signed-off-by: David Sterba <dsterba@suse.com>
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@ -2746,7 +2746,19 @@ static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
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/*
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* @opf: bio REQ_OP_* and REQ_* flags as one value
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* @tree: tree so we can call our merge_bio hook
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* @wbc: optional writeback control for io accounting
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* @page: page to add to the bio
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* @pg_offset: offset of the new bio or to check whether we are adding
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* a contiguous page to the previous one
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* @size: portion of page that we want to write
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* @offset: starting offset in the page
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* @bdev: attach newly created bios to this bdev
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* @bio_ret: must be valid pointer, newly allocated bio will be stored there
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* @end_io_func: end_io callback for new bio
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* @mirror_num: desired mirror to read/write
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* @prev_bio_flags: flags of previous bio to see if we can merge the current one
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* @bio_flags: flags of the current bio to see if we can merge them
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*/
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static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree,
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struct writeback_control *wbc,
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