pmemblk: remove pmemblk engine

No further support or maintenance of the libpmemblk library is planned.
https://pmem.io/blog/2022/11/update-on-pmdk-and-our-long-term-support-strategy/
pmem/pmdk#5538

Signed-off-by: osalyk <oksana.salyk@intel.com>

HOWTO.rst

@@ -2147,11 +2147,6 @@ I/O engine
 			before overwriting. The `trimwrite` mode works well for this
 			constraint.
 
-		**pmemblk**
-			Read and write using filesystem DAX to a file on a filesystem
-			mounted with DAX on a persistent memory device through the PMDK
-			libpmemblk library.
-
 		**dev-dax**
 			Read and write using device DAX to a persistent memory device (e.g.,
 			/dev/dax0.0) through the PMDK libpmem library.

Makefile

@@ -208,11 +208,6 @@ ifdef CONFIG_MTD
   SOURCE += oslib/libmtd.c
   SOURCE += oslib/libmtd_legacy.c
 endif
-ifdef CONFIG_PMEMBLK
-  pmemblk_SRCS = engines/pmemblk.c
-  pmemblk_LIBS = -lpmemblk
-  ENGINES += pmemblk
-endif
 ifdef CONFIG_LINUX_DEVDAX
   dev-dax_SRCS = engines/dev-dax.c
   dev-dax_LIBS = -lpmem

ci/actions-install.sh

@@ -45,7 +45,6 @@ DPKGCFG
                 libnbd-dev
                 libpmem-dev
                 libpmem2-dev
-                libpmemblk-dev
                 libprotobuf-c-dev
                 librbd-dev
                 libtcmalloc-minimal4

configure

@@ -163,7 +163,6 @@ show_help="no"
 exit_val=0
 gfio_check="no"
 libhdfs="no"
-pmemblk="no"
 devdax="no"
 pmem="no"
 cuda="no"
@@ -2229,43 +2228,6 @@ if compile_prog "" "-lpmem2" "libpmem2"; then
 fi
 print_config "libpmem2" "$libpmem2"
 
-##########################################
-# Check whether we have libpmemblk
-# libpmem is a prerequisite
-if test "$libpmemblk" != "yes" ; then
-  libpmemblk="no"
-fi
-if test "$libpmem" = "yes"; then
-  cat > $TMPC << EOF
-#include <libpmemblk.h>
-int main(int argc, char **argv)
-{
-  PMEMblkpool *pbp;
-  pbp = pmemblk_open("", 0);
-  return 0;
-}
-EOF
-  if compile_prog "" "-lpmemblk" "libpmemblk"; then
-    libpmemblk="yes"
-  fi
-fi
-print_config "libpmemblk" "$libpmemblk"
-
-# Choose libpmem-based ioengines
-if test "$libpmem" = "yes" && test "$disable_pmem" = "no"; then
-  devdax="yes"
-  if test "$libpmem1_5" = "yes"; then
-    pmem="yes"
-  fi
-  if test "$libpmemblk" = "yes"; then
-    pmemblk="yes"
-  fi
-fi
-
-##########################################
-# Report whether pmemblk engine is enabled
-print_config "PMDK pmemblk engine" "$pmemblk"
-
 ##########################################
 # Report whether dev-dax engine is enabled
 print_config "PMDK dev-dax engine" "$devdax"
@@ -3191,9 +3153,6 @@ fi
 if test "$mtd" = "yes" ; then
   output_sym "CONFIG_MTD"
 fi
-if test "$pmemblk" = "yes" ; then
-  output_sym "CONFIG_PMEMBLK"
-fi
 if test "$devdax" = "yes" ; then
   output_sym "CONFIG_LINUX_DEVDAX"
 fi