On 23.05.24 13:48, Matthew Wilcox wrote: > On Thu, May 23, 2024 at 09:54:00AM +0000, Johannes Thumshirn wrote: >> On 23.05.24 03:42, Matthew Wilcox wrote: >>> I think the right way to handle this is to call read_mapping_folio(). >>> That will allocate a folio in the page cache for you (obeying the >>> minimum folio size). Then you can examine the contents. It should >>> actually remove code from zonefs. Don't forget to call folio_put() >>> when you're done with it (either at unmount or at the end of mount if >>> you copy what you need elsewhere). >> >> Hmm but read mapping folio needs an inode for the address_space. Or does >> the block device inode work here? > > Sorry, yes, should have been explicit. Read it using the bdev's > address_space. > Ah OK then it's easy.
