closures: CLOSURE_CALLBACK() to fix type punning

2023-11-24T05:29:58Z

Control flow integrity is now checking that type signatures match on indirect function calls. That breaks closures, which embed a work_struct in a closure in such a way that a closure_fn may also be used as a workqueue fn by the underlying closure code. So we have to change closure fns to take a work_struct as their argument - but that results in a loss of clarity, as closure fns have different semantics from normal workqueue functions (they run owning a ref on the closure, which must be released with continue_at() or closure_return()). Thus, this patc introduces CLOSURE_CALLBACK() and closure_type() macros as suggested by Kees, to smooth things over a bit. Suggested-by: Kees Cook Cc: Coly Li Signed-off-by: Kent Overstreet

bcachefs: Break up io.c

2023-10-22T21:10:12Z

More reorganization, this splits up io.c into - io_read.c - io_misc.c - fallocate, fpunch, truncate - io_write.c Signed-off-by: Kent Overstreet

kernel.git/fs/bcachefs/io_write.h, branch linux-6.7.y

closures: CLOSURE_CALLBACK() to fix type punning

bcachefs: Break up io.c