Re: [PATCH blktests v2 1/2] src: add mini ublk source code

[Ming Lei <ming.lei@redhat.com>]

On Fri, Feb 17, 2023 at 02:05:48PM +0000, Shinichiro Kawasaki wrote:
> Hi Ming, thanks for the v2 series. Please find my comments in line.
> 
> On Feb 17, 2023 / 09:38, Ming Lei wrote:
> > Prepare for adding ublk related test:
> > 
> > 1) ublk delete is sync removal, this way is convenient to
> >    blkg/queue/disk instance leak issue
> > 
> > 2) mini ublk has two builtin target(null, loop), and loop IO is
> > handled by io_uring, so we can use ublk to cover part of io_uring
> > workloads
> > 
> > 3) not like loop/nbd, ublk won't pre-allocate/add disk, and always
> > add/delete disk dynamically, this way may cover disk plug & unplug
> > tests
> > 
> > 4) ublk specific test given people starts to use it, so better to
> > let blktest cover ublk related tests
> > 
> > Add mini ublk source for test purpose only, which is easy to use:
> > 
> > ./miniublk add -t {null|loop} [-q nr_queues] [-d depth] [-n dev_id]
> > 	 default: nr_queues=2(max 4), depth=128(max 128), dev_id=-1(auto allocation)
> > 	 -t loop -f backing_file
> > 	 -t null
> > ./miniublk del [-n dev_id] [--disk/-d disk_path ] -a
> > 	 -a delete all devices, -d delete device by disk path,
> > 	 -n delete specified device
> > ./miniublk list [-n dev_id] -a
> > 	 -a list all devices, -n list specified device, default -a
> > 
> > ublk depends on liburing 2.2, so allow to ignore ublk build failure
> > in case of missing liburing, and we will check if ublk program exits
> > inside test. Also v6.0 is the 1st linux kernel release with ublk.
> 
> This v2 patch prevents the ublk build failure. Could you rewrite this paragraph?

Sure.

> 
> > 
> > Signed-off-by: Ming Lei <ming.lei@redhat.com>
> > ---
> >  Makefile            |    2 +-
> >  src/Makefile        |   18 +
> >  src/ublk/miniublk.c | 1376 +++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 1395 insertions(+), 1 deletion(-)
> >  create mode 100644 src/ublk/miniublk.c
> > 
> > diff --git a/Makefile b/Makefile
> > index 5a04479..b9bbade 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -2,7 +2,7 @@ prefix ?= /usr/local
> >  dest = $(DESTDIR)$(prefix)/blktests
> >  
> >  all:
> > -	$(MAKE) -C src all
> > +	$(MAKE) -i -C src all
> 
> As you pointed out in another e-mail, -i is no longer required.
> 
> >  
> >  clean:
> >  	$(MAKE) -C src clean
> > diff --git a/src/Makefile b/src/Makefile
> > index 3b587f6..eae52db 100644
> > --- a/src/Makefile
> > +++ b/src/Makefile
> > @@ -2,6 +2,10 @@ HAVE_C_HEADER = $(shell if echo "\#include <$(1)>" |		\
> >  		$(CC) -E - > /dev/null 2>&1; then echo "$(2)";	\
> >  		else echo "$(3)"; fi)
> >  
> > +HAVE_C_MACRO = $(shell if echo "#include <$(1)>" |	\
> > +		$(CC) -E - 2>&1 /dev/null | grep $(2) > /dev/null 2>&1; \
> > +		then echo 1;else echo 0; fi)
> > +
> >  C_TARGETS := \
> >  	loblksize \
> >  	loop_change_fd \
> > @@ -13,16 +17,27 @@ C_TARGETS := \
> >  	sg/syzkaller1 \
> >  	zbdioctl
> >  
> > +C_MINIUBLK := ublk/miniublk
> > +
> > +HAVE_LIBURING := $(call HAVE_C_MACRO,liburing.h,IORING_OP_URING_CMD)
> > +HAVE_UBLK_HEADER := $(call HAVE_C_HEADER,linux/ublk_cmd.h,1)
> > +
> >  CXX_TARGETS := \
> >  	discontiguous-io
> >  
> > +ifeq ($(HAVE_LIBURING)$(HAVE_UBLK_HEADER), 11)
> > +TARGETS := $(C_TARGETS) $(CXX_TARGETS) $(C_MINIUBLK)
> > +else
> > +$(info Skip $(C_MINIUBLK) build due to missing kernel header(v6.0+) or liburing(2.2+))
> >  TARGETS := $(C_TARGETS) $(CXX_TARGETS)
> > +endif
> >  
> >  CONFIG_DEFS := $(call HAVE_C_HEADER,linux/blkzoned.h,-DHAVE_LINUX_BLKZONED_H)
> >  
> >  override CFLAGS   := -O2 -Wall -Wshadow $(CFLAGS) $(CONFIG_DEFS)
> >  override CXXFLAGS := -O2 -std=c++11 -Wall -Wextra -Wshadow -Wno-sign-compare \
> >  		     -Werror $(CXXFLAGS) $(CONFIG_DEFS)
> > +MINIUBLK_FLAGS :=  -D_GNU_SOURCE -lpthread -luring
> >  
> >  all: $(TARGETS)
> >  
> > @@ -39,4 +54,7 @@ $(C_TARGETS): %: %.c
> >  $(CXX_TARGETS): %: %.cpp
> >  	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $^
> >  
> > +$(C_MINIUBLK): %: ublk/miniublk.c
> > +	$(CC) $(CFLAGS) $(MINIUBLK_FLAGS) -o $@ ublk/miniublk.c
> > +
> >  .PHONY: all clean install
> > diff --git a/src/ublk/miniublk.c b/src/ublk/miniublk.c
> > new file mode 100644
> > index 0000000..e84ba41
> > --- /dev/null
> > +++ b/src/ublk/miniublk.c
> 
> Do you plan to add more programs in the ublk/ directory? If not, I suggest to
> place miniublk.c in just under src/.

Sounds good.

> 
> Also, could you add miniublk to src/.gitignore?

OK.

Thanks,
Ming