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SubjectRe: [PATCH v3 7/7] erofs: redundant assignment in __erofs_get_meta_page()
> -		err = bio_add_page(bio, page, PAGE_SIZE, 0);
> - if (err != PAGE_SIZE) {
> + if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
> err = -EFAULT;
> goto err_out;
> }

This patch looks like an improvement. But looking at that whole
area just makes me cringe.

Why is there __erofs_get_meta_page with the two weird booleans instead
of a single erofs_get_meta_page that gets and gfp_t for additional
flags and an unsigned int for additional bio op flags.

Why do need ioprio support to start with? Seeing that in a new
fs look kinda odd. Do you have benchmarks that show the difference?

That function then calls erofs_grab_bio, which tries to handle a
bio_alloc failure, except that the function will not actually fail
due the mempool backing it. It also seems like and awfully
huge function to inline.

Why is there __submit_bio which really just obsfucates what is
going on? Also why is __submit_bio using bio_set_op_attrs instead
of opencode it as the comment right next to it asks you to?

Also I really don't understand why you can't just use read_cache_page
or even read_cache_page_gfp instead of __erofs_get_meta_page.
That function is a whole lot of duplication of functionality shared
by a lot of other file systems.

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