statfs: towards _STATFS_F_FLAGS

preparatory work.

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 57 insertions, 55 deletions

diff --git a/libc/misc/statfs/internal_statvfs.c b/libc/misc/statfs/internal_statvfs.c
index 29890d490..717673921 100644
--- a/libc/misc/statfs/internal_statvfs.c
+++ b/libc/misc/statfs/internal_statvfs.c
@@ -16,6 +16,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+/* The kernel hints us if the f_flags is valid  */
+#define ST_VALID 0x0020
+
   /* Now fill in the fields we have information for.  */
   buf->f_bsize = fsbuf.f_bsize;
 #ifdef _STATFS_F_FRSIZE
@@ -31,7 +34,7 @@
   buf->f_ffree = fsbuf.f_ffree;
   if (sizeof (buf->f_fsid) == sizeof (fsbuf.f_fsid))
     buf->f_fsid = (fsbuf.f_fsid.__val[0]
-		   | ((unsigned long int) fsbuf.f_fsid.__val[1]
+		   | ((unsigned long long int) fsbuf.f_fsid.__val[1]
 		      << (8 * (sizeof (buf->f_fsid)
 			       - sizeof (fsbuf.f_fsid.__val[0])))));
   else
@@ -43,9 +46,6 @@
 #endif
   buf->f_namemax = fsbuf.f_namelen;
   memset (buf->__f_spare, '\0', sizeof(fsbuf.f_spare));
-
-  /* What remains to do is to fill the fields f_favail and f_flag.  */
-
   /* XXX I have no idea how to compute f_favail.  Any idea???  */
   buf->f_favail = buf->f_ffree;
 
@@ -54,61 +54,63 @@
      file.  The way we can test for matching filesystem is using the
      device number.  */
   buf->f_flag = 0;
-  if (STAT (&st) >= 0)
-    {
-      int save_errno = errno;
-      struct mntent mntbuf;
-      FILE *mtab;
-
-      mtab = setmntent ("/proc/mounts", "r");
-      if (mtab == NULL)
-	mtab = setmntent (_PATH_MOUNTED, "r");
+  if (STAT (&st) >= 0
+#ifdef _STATFS_F_FLAGS
+	  && (fsbuf.f_flags & ST_VALID) == 0
+#endif
+	 ) {
+	  int save_errno = errno;
+	  struct mntent mntbuf;
+	  FILE *mtab;
 
-      if (mtab != NULL)
-	{
-	  char tmpbuf[1024];
+	  mtab = setmntent ("/proc/mounts", "r");
+	  if (mtab == NULL)
+		mtab = setmntent (_PATH_MOUNTED, "r");
+	  if (mtab != NULL) {
+		char tmpbuf[1024];
 
-	  while (getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
-	    {
-	      struct stat fsst;
+		while (getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf))) {
+		  struct stat fsst;
 
-	      /* Find out about the device the current entry is for.  */
-	      if (stat (mntbuf.mnt_dir, &fsst) >= 0
-		  && st.st_dev == fsst.st_dev)
-		{
-		  /* Bingo, we found the entry for the device FD is on.
-		     Now interpret the option string.  */
-		  char *cp = mntbuf.mnt_opts;
-		  char *opt;
+		  /* Find out about the device the current entry is for.  */
+		  if (stat (mntbuf.mnt_dir, &fsst) >= 0
+			  && st.st_dev == fsst.st_dev) {
+			  /* Bingo, we found the entry for the device FD is on.
+				 Now interpret the option string.  */
+			  char *cp = mntbuf.mnt_opts;
+			  char *opt;
 
-		  while ((opt = strsep (&cp, ",")) != NULL)
-		    if (strcmp (opt, "ro") == 0)
-		      buf->f_flag |= ST_RDONLY;
-		    else if (strcmp (opt, "nosuid") == 0)
-		      buf->f_flag |= ST_NOSUID;
+			  while ((opt = strsep (&cp, ",")) != NULL)
+				if (strcmp (opt, "ro") == 0)
+				  buf->f_flag |= ST_RDONLY;
+				else if (strcmp (opt, "nosuid") == 0)
+				  buf->f_flag |= ST_NOSUID;
 #ifdef __USE_GNU
-		    else if (strcmp (opt, "noexec") == 0)
-		      buf->f_flag |= ST_NOEXEC;
-		    else if (strcmp (opt, "nodev") == 0)
-		      buf->f_flag |= ST_NODEV;
-		    else if (strcmp (opt, "sync") == 0)
-		      buf->f_flag |= ST_SYNCHRONOUS;
-		    else if (strcmp (opt, "mand") == 0)
-		      buf->f_flag |= ST_MANDLOCK;
-		    else if (strcmp (opt, "noatime") == 0)
-		      buf->f_flag |= ST_NOATIME;
-		    else if (strcmp (opt, "nodiratime") == 0)
-		      buf->f_flag |= ST_NODIRATIME;
+				else if (strcmp (opt, "noexec") == 0)
+				  buf->f_flag |= ST_NOEXEC;
+				else if (strcmp (opt, "nodev") == 0)
+				  buf->f_flag |= ST_NODEV;
+				else if (strcmp (opt, "sync") == 0)
+				  buf->f_flag |= ST_SYNCHRONOUS;
+				else if (strcmp (opt, "mand") == 0)
+				  buf->f_flag |= ST_MANDLOCK;
+				else if (strcmp (opt, "noatime") == 0)
+				  buf->f_flag |= ST_NOATIME;
+				else if (strcmp (opt, "nodiratime") == 0)
+				  buf->f_flag |= ST_NODIRATIME;
+				else if (strcmp (opt, "relatime") == 0)
+				  buf->f_flag |= ST_RELATIME;
 #endif
-
-		  /* We can stop looking for more entries.  */
-		  break;
+			  /* We can stop looking for more entries.  */
+			  break;
+		  }
 		}
-	    }
-
-	  /* Close the file.  */
-	  endmntent (mtab);
-	}
-
-      __set_errno (save_errno);
-    }
+		/* Close the file.  */
+		endmntent (mtab);
+	  }
+	  __set_errno (save_errno);
+  }
+#ifdef _STATFS_F_FLAGS
+	else
+	  buf->f_flag = fsbuf.f_flags ^ ST_VALID;
+#endif