fuzzy: add a custom xfs find utility for scrub stress tests

Create a new find(1) like utility that doesn't crash on directory tree
changes (like find does due to bugs in its loop detector) and actually
implements the custom xfs attribute predicates that we need for scrub
stress tests.  This program will be needed for a future patch where we
add stress tests for scrub and repair of file metadata.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>

.gitignore

@@ -178,6 +178,7 @@ tags
 /src/writemod
 /src/writev_on_pagefault
 /src/xfsctl
+/src/xfsfind
 /src/aio-dio-regress/aio-dio-append-write-fallocate-race
 /src/aio-dio-regress/aio-dio-append-write-read-race
 /src/aio-dio-regress/aio-dio-cow-race

configure.ac

@@ -66,6 +66,11 @@ AC_PACKAGE_WANT_LINUX_FS_H
 AC_PACKAGE_WANT_LIBBTRFSUTIL
 
 AC_HAVE_COPY_FILE_RANGE
+AC_HAVE_SEEK_DATA
+AC_HAVE_BMV_OF_SHARED
+AC_HAVE_NFTW
+AC_HAVE_RLIMIT_NOFILE
+
 AC_CHECK_FUNCS([renameat2])
 AC_CHECK_FUNCS([reallocarray])
 AC_CHECK_TYPES([struct mount_attr], [], [], [[#include <linux/mount.h>]])

include/builddefs.in

@@ -68,6 +68,10 @@ HAVE_FIEMAP = @have_fiemap@
 HAVE_FALLOCATE = @have_fallocate@
 HAVE_COPY_FILE_RANGE = @have_copy_file_range@
 HAVE_LIBBTRFSUTIL = @have_libbtrfsutil@
+HAVE_SEEK_DATA = @have_seek_data@
+HAVE_NFTW = @have_nftw@
+HAVE_BMV_OF_SHARED = @have_bmv_of_shared@
+HAVE_RLIMIT_NOFILE = @have_rlimit_nofile@
 
 GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall
 

m4/package_libcdev.m4

@@ -110,3 +110,47 @@ AC_DEFUN([AC_HAVE_COPY_FILE_RANGE],
     AC_SUBST(have_copy_file_range)
   ])
 
+# Check if we have SEEK_DATA
+AC_DEFUN([AC_HAVE_SEEK_DATA],
+  [ AC_MSG_CHECKING([for SEEK_DATA])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <unistd.h>
+    ]], [[
+         lseek(-1, 0, SEEK_DATA);
+    ]])],[have_seek_data=yes
+       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
+    AC_SUBST(have_seek_data)
+  ])
+
+# Check if we have nftw
+AC_DEFUN([AC_HAVE_NFTW],
+  [ AC_MSG_CHECKING([for nftw])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <stddef.h>
+#include <ftw.h>
+    ]], [[
+         nftw("/", (int (*)(const char *, const struct stat *, int, struct FTW *))1, 0, 0);
+    ]])],[have_nftw=yes
+       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
+    AC_SUBST(have_nftw)
+  ])
+
+# Check if we have RLIMIT_NOFILE
+AC_DEFUN([AC_HAVE_RLIMIT_NOFILE],
+  [ AC_MSG_CHECKING([for RLIMIT_NOFILE])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <sys/time.h>
+#include <sys/resource.h>
+    ]], [[
+         struct rlimit rlimit;
+
+         rlimit.rlim_cur = 0;
+         getrlimit(RLIMIT_NOFILE, &rlimit);
+    ]])],[have_rlimit_nofile=yes
+       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
+    AC_SUBST(have_rlimit_nofile)
+  ])

m4/package_xfslibs.m4

@@ -104,3 +104,18 @@ AC_DEFUN([AC_PACKAGE_NEED_XFSCTL_MACRO],
         exit 1
       ])
   ])
+
+# Check if we have BMV_OF_SHARED from the GETBMAPX ioctl
+AC_DEFUN([AC_HAVE_BMV_OF_SHARED],
+  [ AC_MSG_CHECKING([for BMV_OF_SHARED])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <xfs/xfs.h>
+    ]], [[
+         struct getbmapx obj;
+         ioctl(-1, XFS_IOC_GETBMAPX, &obj);
+         obj.bmv_oflags |= BMV_OF_SHARED;
+    ]])],[have_bmv_of_shared=yes
+       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
+    AC_SUBST(have_bmv_of_shared)
+  ])

src/Makefile

@@ -83,6 +83,16 @@ ifeq ($(HAVE_LIBCAP), true)
 LLDLIBS += -lcap
 endif
 
+ifeq ($(HAVE_SEEK_DATA), yes)
+ ifeq ($(HAVE_NFTW), yes)
+  ifeq ($(HAVE_BMV_OF_SHARED), yes)
+   ifeq ($(HAVE_RLIMIT_NOFILE), yes)
+     TARGETS += xfsfind
+   endif
+  endif
+ endif
+endif
+
 CFILES = $(TARGETS:=.c)
 LDIRT = $(TARGETS) fssum