[PATCH 5.15 009/136] block: add a bdev_max_zone_append_sectors helper

[Greg Kroah-Hartman]

From: Christoph Hellwig <hch@xxxxxx>

commit 2aba0d19f4d8c8929b4b3b94a9cfde2aa20e6ee2 upstream

Add a helper to check the max supported sectors for zone append based on
the block_device instead of having to poke into the block layer internal
request_queue.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Acked-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220415045258.199825-16-hch@xxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/nvme/target/zns.c |    3 +--
 fs/zonefs/super.c         |    3 +--
 include/linux/blkdev.h    |    6 ++++++
 3 files changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/nvme/target/zns.c
+++ b/drivers/nvme/target/zns.c
@@ -34,8 +34,7 @@ static int validate_conv_zones_cb(struct
 
 bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
 {
-	struct request_queue *q = ns->bdev->bd_disk->queue;
-	u8 zasl = nvmet_zasl(queue_max_zone_append_sectors(q));
+	u8 zasl = nvmet_zasl(bdev_max_zone_append_sectors(ns->bdev));
 	struct gendisk *bd_disk = ns->bdev->bd_disk;
 	int ret;
 
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -723,13 +723,12 @@ static ssize_t zonefs_file_dio_append(st
 	struct inode *inode = file_inode(iocb->ki_filp);
 	struct zonefs_inode_info *zi = ZONEFS_I(inode);
 	struct block_device *bdev = inode->i_sb->s_bdev;
-	unsigned int max;
+	unsigned int max = bdev_max_zone_append_sectors(bdev);
 	struct bio *bio;
 	ssize_t size;
 	int nr_pages;
 	ssize_t ret;
 
-	max = queue_max_zone_append_sectors(bdev_get_queue(bdev));
 	max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize);
 	iov_iter_truncate(from, max);
 
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1387,6 +1387,12 @@ static inline unsigned int queue_max_zon
 	return min(l->max_zone_append_sectors, l->max_sectors);
 }
 
+static inline unsigned int
+bdev_max_zone_append_sectors(struct block_device *bdev)
+{
+	return queue_max_zone_append_sectors(bdev_get_queue(bdev));
+}
+
 static inline unsigned queue_logical_block_size(const struct request_queue *q)
 {
 	int retval = 512;