tools/vm: Switch to liblk library

page-flags.c had some older version of debugfs_mount copied from perf so
convert it to using the version in the tools library.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/1361374353-30385-8-git-send-email-bp@alien8.de
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 21 insertions, 81 deletions

diff --git a/tools/vm/Makefile b/tools/vm/Makefile
index 8e30e5c40f8a..24e9ddd93fa4 100644
--- a/tools/vm/Makefile
+++ b/tools/vm/Makefile
@@ -1,11 +1,22 @@
 # Makefile for vm tools
+#
+TARGETS=page-types slabinfo
+
+LK_DIR = ../lib/lk
+LIBLK = $(LK_DIR)/liblk.a
 
 CC = $(CROSS_COMPILE)gcc
-CFLAGS = -Wall -Wextra
+CFLAGS = -Wall -Wextra -I../lib/
+LDFLAGS = $(LIBLK)
+
+$(TARGETS): liblk
+
+liblk:
+        make -C $(LK_DIR)
 
-all: page-types slabinfo
 %: %.c
-        $(CC) $(CFLAGS) -o $@ $^
+        $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
 
 clean:
         $(RM) page-types slabinfo
+        make -C ../lib/lk clean
diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index b76edf2f8333..71c9c2511ee7 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -36,7 +36,7 @@
 #include <sys/statfs.h>
 #include "../../include/uapi/linux/magic.h"
 #include "../../include/uapi/linux/kernel-page-flags.h"
-
+#include <lk/debugfs.h>
 
 #ifndef MAX_PATH
 # define MAX_PATH 256
@@ -178,7 +178,7 @@ static int		kpageflags_fd;
 static int              opt_hwpoison;
 static int              opt_unpoison;
 
-static char             hwpoison_debug_fs[MAX_PATH+1];
+static char             *hwpoison_debug_fs;
 static int              hwpoison_inject_fd;
 static int              hwpoison_forget_fd;
 
@@ -458,81 +458,6 @@ static uint64_t kpageflags_flags(uint64_t flags)
         return flags;
 }
 
-/* verify that a mountpoint is actually a debugfs instance */
-static int debugfs_valid_mountpoint(const char *debugfs)
-{
-        struct statfs st_fs;
-
-        if (statfs(debugfs, &st_fs) < 0)
-                return -ENOENT;
-        else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
-                return -ENOENT;
-
-        return 0;
-}
-
-/* find the path to the mounted debugfs */
-static const char *debugfs_find_mountpoint(void)
-{
-        const char *const *ptr;
-        char type[100];
-        FILE *fp;
-
-        ptr = debugfs_known_mountpoints;
-        while (*ptr) {
-                if (debugfs_valid_mountpoint(*ptr) == 0) {
-                        strcpy(hwpoison_debug_fs, *ptr);
-                        return hwpoison_debug_fs;
-                }
-                ptr++;
-        }
-
-        /* give up and parse /proc/mounts */
-        fp = fopen("/proc/mounts", "r");
-        if (fp == NULL)
-                perror("Can't open /proc/mounts for read");
-
-        while (fscanf(fp, "%*s %"
-                      STR(MAX_PATH)
-                      "s %99s %*s %*d %*d\n",
-                      hwpoison_debug_fs, type) == 2) {
-                if (strcmp(type, "debugfs") == 0)
-                        break;
-        }
-        fclose(fp);
-
-        if (strcmp(type, "debugfs") != 0)
-                return NULL;
-
-        return hwpoison_debug_fs;
-}
-
-/* mount the debugfs somewhere if it's not mounted */
-
-static void debugfs_mount(void)
-{
-        const char *const *ptr;
-
-        /* see if it's already mounted */
-        if (debugfs_find_mountpoint())
-                return;
-
-        ptr = debugfs_known_mountpoints;
-        while (*ptr) {
-                if (mount(NULL, *ptr, "debugfs", 0, NULL) == 0) {
-                        /* save the mountpoint */
-                        strcpy(hwpoison_debug_fs, *ptr);
-                        break;
-                }
-                ptr++;
-        }
-
-        if (*ptr == NULL) {
-                perror("mount debugfs");
-                exit(EXIT_FAILURE);
-        }
-}
-
 /*
  * page actions
  */
@@ -541,7 +466,11 @@ static void prepare_hwpoison_fd(void)
 {
         char buf[MAX_PATH + 1];
 
-        debugfs_mount();
+        hwpoison_debug_fs = debugfs_mount(NULL);
+        if (!hwpoison_debug_fs) {
+                perror("mount debugfs");
+                exit(EXIT_FAILURE);
+        }
 
         if (opt_hwpoison && !hwpoison_inject_fd) {
                 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",