From: Darrick J. Wong <djwong@xxxxxxxxxx>
If argv[0] ends in "ext[0-9]", set the fuse subtype string to this
value. This enables us to place fuse2fs at some place in the filesystem
like /sbin/mount.ext2 and have /proc/mounts report the filesystem type
as "fuse.ext2". This is fairly boring, but it'll make it easier to test
things in fstests.
Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
misc/fuse2fs.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 245d2b3b916686..991a9f6733148d 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -26,6 +26,7 @@
#endif
#include <sys/ioctl.h>
#include <unistd.h>
+#include <ctype.h>
#ifdef __SET_FOB_FOR_FUSE
# error Do not set magic value __SET_FOB_FOR_FUSE!!!!
#endif
@@ -3812,6 +3813,23 @@ static int fuse2fs_opt_proc(void *data, const char *arg,
return 1;
}
+static const char *get_subtype(const char *argv0)
+{
+ size_t argvlen = strlen(argv0);
+
+ if (argvlen < 4)
+ goto out_default;
+
+ if (argv0[argvlen - 4] == 'e' &&
+ argv0[argvlen - 3] == 'x' &&
+ argv0[argvlen - 2] == 't' &&
+ isdigit(argv0[argvlen - 1]))
+ return &argv0[argvlen - 4];
+
+out_default:
+ return "ext4";
+}
+
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
@@ -3954,8 +3972,9 @@ int main(int argc, char *argv[])
get_random_bytes(&fctx.next_generation, sizeof(unsigned int));
/* Set up default fuse parameters */
- snprintf(extra_args, BUFSIZ, "-okernel_cache,subtype=ext4,"
+ snprintf(extra_args, BUFSIZ, "-okernel_cache,subtype=%s,"
"fsname=%s,attr_timeout=0" FUSE_PLATFORM_OPTS,
+ get_subtype(argv[0]),
fctx.device);
if (fctx.no_default_opts == 0)
fuse_opt_add_arg(&args, extra_args);
