svn commit: r348007 - projects/fuse2/lib/libc/gen

[Alan Somers]

Author: asomers
Date: Mon May 20 19:36:36 2019
New Revision: 348007
URL: https://svnweb.freebsd.org/changeset/base/348007

Log:
  special-case getvfsbyname(3) for fusefs(5)
  
  fusefs file systems may have a fsname subtype (set by mount_fusefs's "-o
  subtype" option) that gets appended to the fsname as returned by statfs(2).
  The subtype is set on a per-mount basis so it isn't part of the struct
  vfsconf.  Special-case getvfsbyname to match either the full "fusefs.foobar"
  or short "fusefs" fsname.
  
  Sponsored by:	The FreeBSD Foundation

Modified:
  projects/fuse2/lib/libc/gen/getvfsbyname.c

Modified: projects/fuse2/lib/libc/gen/getvfsbyname.c
==============================================================================
--- projects/fuse2/lib/libc/gen/getvfsbyname.c	Mon May 20 19:31:49 2019	(r348006)
+++ projects/fuse2/lib/libc/gen/getvfsbyname.c	Mon May 20 19:36:36 2019	(r348007)
@@ -37,10 +37,26 @@ __FBSDID("$FreeBSD$");
 #include <sys/mount.h>
 #include <sys/sysctl.h>
 #include <errno.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 
 /*
+ * fusefs(5) file systems may have a "subtype" which gets appended to
+ * statfs(2)'s f_fstypename field on a per-mount basis.  Allow getvfsbyname to
+ * match either the full "fusefs.foobar" or the more general "fusefs".
+ */
+static bool
+are_fusefs(const char *fsname, const char *vfc_name)
+{
+	const char fusefs[] = "fusefs";
+	const char fusefs_dot[] = "fusefs.";
+
+	return (strncmp(fsname, fusefs_dot, strlen(fusefs_dot)) == 0 &&
+	    strcmp(fusefs, vfc_name) == 0);
+}
+
+/*
  * Given a filesystem name, determine if it is resident in the kernel,
  * and if it is resident, return its xvfsconf structure.
  */
@@ -62,7 +78,9 @@ getvfsbyname(const char *fsname, struct xvfsconf *vfcp
 	}
 	cnt = buflen / sizeof(struct xvfsconf);
 	for (i = 0; i < cnt; i++) {
-		if (strcmp(fsname, xvfsp[i].vfc_name) == 0) {
+		if (strcmp(fsname, xvfsp[i].vfc_name) == 0 ||
+		    are_fusefs(fsname, xvfsp[i].vfc_name))
+		{
 			memcpy(vfcp, xvfsp + i, sizeof(struct xvfsconf));
 			free(xvfsp);
 			return (0);