[PATCH 2/6] libxfs/linux.c: Replace use of ustat by stat

[Felix Janda <felix.janda@xxxxxxxxx>]

ustat has been used to check whether a device file is mounted.
The function is deprecated and not supported by uclibc and musl.
Now do the check using the *mntent functions.

Based on patch by Natanael Copa <ncopa@xxxxxxxxxxxxxxx>.

Signed-off-by: Felix Janda <felix.janda@xxxxxxxxx>
---
 libxfs/linux.c | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/libxfs/linux.c b/libxfs/linux.c
index c532d65..e7adcf2 100644
--- a/libxfs/linux.c
+++ b/libxfs/linux.c
@@ -16,11 +16,8 @@
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#define ustat __kernel_ustat
 #include <mntent.h>
 #include <sys/stat.h>
-#undef ustat
-#include <sys/ustat.h>
 #include <sys/mount.h>
 #include <sys/ioctl.h>
 #include <sys/sysinfo.h>
@@ -51,9 +48,10 @@ static int max_block_alignment;
 int
 platform_check_ismounted(char *name, char *block, struct stat64 *s, int 
verbose)
 {
-       /* Pad ust; pre-2.6.28 linux copies out too much in 32bit compat mode */
-       struct ustat    ust[2];
-       struct stat64   st;
+       FILE            *f;
+       struct stat64   st, mst;
+       struct mntent   *mnt;
+       char            mounts[MAXPATHLEN];
 
        if (!s) {
                if (stat64(block, &st) < 0)
@@ -63,14 +61,27 @@ platform_check_ismounted(char *name, char *block, struct 
stat64 *s, int verbose)
                s = &st;
        }
 
-       if (ustat(s->st_rdev, ust) >= 0) {
+       strcpy(mounts, (!access(PROC_MOUNTED, R_OK)) ? PROC_MOUNTED : MOUNTED);
+       if ((f = setmntent(mounts, "r")) == NULL) {
+               fprintf(stderr,
+                   _("%s: %s possibly contains a mounted filesystem\n"),
+                   progname, name);
+               return 1;
+       }
+       while ((mnt = getmntent(f)) != NULL) {
+               if (stat64(mnt->mnt_dir, &mst) < 0)
+                       continue;
+               if (mst.st_dev != s->st_rdev)
+                       continue;
+
                if (verbose)
                        fprintf(stderr,
                                _("%s: %s contains a mounted filesystem\n"),
                                progname, name);
-               return 1;
+               break;
        }
-       return 0;
+       endmntent(f);
+       return mnt == NULL;
 }
 
 int
-- 
2.4.10