On Mon, Nov 28, 2022 at 10:48:41PM -0800, Jaegeuk Kim wrote:
> > static void f2fs_finish_read_bio(struct bio *bio, bool in_task)
> > {
> > struct bio_vec *bv;
> > struct bvec_iter_all iter_all;
> > + struct bio_post_read_ctx *ctx = bio->bi_private;
> >
> > - /*
> > - * Update and unlock the bio's pagecache pages, and put the
> > - * decompression context for any compressed pages.
> > - */
> > bio_for_each_segment_all(bv, bio, iter_all) {
> > struct page *page = bv->bv_page;
> >
> > if (f2fs_is_compressed_page(page)) {
> > - if (bio->bi_status)
> > + if (!ctx->decompression_attempted)
>
> If seems this causes a panic due to the ctx nullified by f2fs_verify_bio.
>
Thanks for catching that! I've sent out v5 that checks for 'ctx &&
!ctx->decompression_attempted' here. That's the right thing to do, since if ctx
is NULL then decompression must have been attempted.
I'd like to get rid of freeing the bio_post_read_ctx in f2fs_verify_bio().
But I believe it's still needed, at least in theory.
Do you have a suggestion for testing f2fs compression + verity with xfstests?
I missed this because compression isn't covered by the "verity" group tests.
Maybe there should be an "f2fs/compress" config in xfstests-bld that uses mkfs
and mount options that cause all files to be automatically compressed, similar
to how f2fs/encrypt automatically encrypts all files with test_dummy_encryption.
- Eric
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