iomap: remove IOMAP_F_ZONE_APPEND

No users left now that btrfs takes REQ_OP_WRITE bios from iomap and
splits and converts them to REQ_OP_ZONE_APPEND internally.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/iomap/direct-io.c

@@ -217,16 +217,10 @@ static inline blk_opf_t iomap_dio_bio_opflags(struct iomap_dio *dio,
 {
 	blk_opf_t opflags = REQ_SYNC | REQ_IDLE;
 
-	if (!(dio->flags & IOMAP_DIO_WRITE)) {
-		WARN_ON_ONCE(iomap->flags & IOMAP_F_ZONE_APPEND);
+	if (!(dio->flags & IOMAP_DIO_WRITE))
 		return REQ_OP_READ;
-	}
 
-	if (iomap->flags & IOMAP_F_ZONE_APPEND)
-		opflags |= REQ_OP_ZONE_APPEND;
-	else
 	opflags |= REQ_OP_WRITE;
-
 	if (use_fua)
 		opflags |= REQ_FUA;
 	else

include/linux/iomap.h

@@ -58,8 +58,7 @@ struct vm_fault;
 #define IOMAP_F_SHARED		(1U << 2)
 #define IOMAP_F_MERGED		(1U << 3)
 #define IOMAP_F_BUFFER_HEAD	(1U << 4)
-#define IOMAP_F_ZONE_APPEND	(1U << 5)
-#define IOMAP_F_XATTR		(1U << 6)
+#define IOMAP_F_XATTR		(1U << 5)
 
 /*
  * Flags set by the core iomap code during operations: