zonefs: fix handling of explicit_open option on mount

Ignoring the explicit_open mount option on mount for devices that do not
have a limit on the number of open zones must be done after the mount
options are parsed and set in s_mount_opts. Move the check to ignore
the explicit_open option after the call to zonefs_parse_options() in
zonefs_fill_super().

Fixes: b5c00e97 ("zonefs: open/close zone on file open/close")
Cc: <stable@vger.kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>

fs/zonefs/super.c

@@ -1760,12 +1760,6 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent)
 
 	atomic_set(&sbi->s_wro_seq_files, 0);
 	sbi->s_max_wro_seq_files = bdev_max_open_zones(sb->s_bdev);
-	if (!sbi->s_max_wro_seq_files &&
-	    sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
-		zonefs_info(sb, "No open zones limit. Ignoring explicit_open mount option\n");
-		sbi->s_mount_opts &= ~ZONEFS_MNTOPT_EXPLICIT_OPEN;
-	}
-
 	atomic_set(&sbi->s_active_seq_files, 0);
 	sbi->s_max_active_seq_files = bdev_max_active_zones(sb->s_bdev);
 
@@ -1790,6 +1784,12 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent)
 	zonefs_info(sb, "Mounting %u zones",
 		    blkdev_nr_zones(sb->s_bdev->bd_disk));
 
+	if (!sbi->s_max_wro_seq_files &&
+	    sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
+		zonefs_info(sb, "No open zones limit. Ignoring explicit_open mount option\n");
+		sbi->s_mount_opts &= ~ZONEFS_MNTOPT_EXPLICIT_OPEN;
+	}
+
 	/* Create root directory inode */
 	ret = -ENOMEM;
 	inode = new_inode(sb);