mount options: fix fuse

Add blksize= option to /proc/mounts for fuseblk filesystems.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/fuse/inode.c

@@ -29,6 +29,8 @@ DEFINE_MUTEX(fuse_mutex);
 
 #define FUSE_SUPER_MAGIC 0x65735546
 
+#define FUSE_DEFAULT_BLKSIZE 512
+
 struct fuse_mount_data {
 	int fd;
 	unsigned rootmode;
@@ -355,7 +357,7 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
 	char *p;
 	memset(d, 0, sizeof(struct fuse_mount_data));
 	d->max_read = ~0;
-	d->blksize = 512;
+	d->blksize = FUSE_DEFAULT_BLKSIZE;
 
 	while ((p = strsep(&opt, ",")) != NULL) {
 		int token;
@@ -440,6 +442,9 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
 		seq_puts(m, ",allow_other");
 	if (fc->max_read != ~0)
 		seq_printf(m, ",max_read=%u", fc->max_read);
+	if (mnt->mnt_sb->s_bdev &&
+	    mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
+		seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize);
 	return 0;
 }