[PATCH 08/78] nbd: refactor size updates

[Christoph Hellwig <hch@xxxxxx>]

Merge nbd_size_set and nbd_size_update into a single function that also
updates the nbd_config fields.  This new function takes the device size
in bytes as the first argument, and the blocksize as the second argument,
simplifying the calculations required in most callers.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
---
 drivers/block/nbd.c | 44 ++++++++++++++++++--------------------------
 1 file changed, 18 insertions(+), 26 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 48054051e281e6..6e8f2ff715c661 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -296,28 +296,30 @@ static void nbd_size_clear(struct nbd_device *nbd)
        }
 }
 
-static void nbd_size_update(struct nbd_device *nbd)
+static void nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
+               loff_t blksize)
 {
-       struct nbd_config *config = nbd->config;
-       sector_t nr_sectors = config->bytesize >> 9;
        struct block_device *bdev;
 
+       nbd->config->bytesize = bytesize;
+       nbd->config->blksize = blksize;
+
        if (!nbd->task_recv)
                return;
 
-       if (config->flags & NBD_FLAG_SEND_TRIM) {
-               nbd->disk->queue->limits.discard_granularity = config->blksize;
-               nbd->disk->queue->limits.discard_alignment = config->blksize;
+       if (nbd->config->flags & NBD_FLAG_SEND_TRIM) {
+               nbd->disk->queue->limits.discard_granularity = blksize;
+               nbd->disk->queue->limits.discard_alignment = blksize;
                blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX);
        }
-       blk_queue_logical_block_size(nbd->disk->queue, config->blksize);
-       blk_queue_physical_block_size(nbd->disk->queue, config->blksize);
+       blk_queue_logical_block_size(nbd->disk->queue, blksize);
+       blk_queue_physical_block_size(nbd->disk->queue, blksize);
 
-       set_capacity(nbd->disk, nr_sectors);
+       set_capacity(nbd->disk, bytesize >> 9);
        bdev = bdget_disk(nbd->disk, 0);
        if (bdev) {
                if (bdev->bd_disk)
-                       bd_set_nr_sectors(bdev, nr_sectors);
+                       bd_set_nr_sectors(bdev, bytesize >> 9);
                else
                        set_bit(GD_NEED_PART_SCAN, &nbd->disk->state);
                bdput(bdev);
@@ -325,15 +327,6 @@ static void nbd_size_update(struct nbd_device *nbd)
        kobject_uevent(&nbd_to_dev(nbd)->kobj, KOBJ_CHANGE);
 }
 
-static void nbd_size_set(struct nbd_device *nbd, loff_t blocksize,
-                        loff_t nr_blocks)
-{
-       struct nbd_config *config = nbd->config;
-       config->blksize = blocksize;
-       config->bytesize = blocksize * nr_blocks;
-       nbd_size_update(nbd);
-}
-
 static void nbd_complete_rq(struct request *req)
 {
        struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);
@@ -1311,7 +1304,7 @@ static int nbd_start_device(struct nbd_device *nbd)
                args->index = i;
                queue_work(nbd->recv_workq, &args->work);
        }
-       nbd_size_update(nbd);
+       nbd_set_size(nbd, config->bytesize, config->blksize);
        return error;
 }
 
@@ -1390,15 +1383,14 @@ static int __nbd_ioctl(struct block_device *bdev, 
struct nbd_device *nbd,
                        arg = NBD_DEF_BLKSIZE;
                if (!nbd_is_valid_blksize(arg))
                        return -EINVAL;
-               nbd_size_set(nbd, arg,
-                            div_s64(config->bytesize, arg));
+               nbd_set_size(nbd, config->bytesize, arg);
                return 0;
        case NBD_SET_SIZE:
-               nbd_size_set(nbd, config->blksize,
-                            div_s64(arg, config->blksize));
+               nbd_set_size(nbd, arg, config->blksize);
                return 0;
        case NBD_SET_SIZE_BLOCKS:
-               nbd_size_set(nbd, config->blksize, arg);
+               nbd_set_size(nbd, arg * config->blksize,
+                            config->blksize);
                return 0;
        case NBD_SET_TIMEOUT:
                nbd_set_cmd_timeout(nbd, arg);
@@ -1828,7 +1820,7 @@ static int nbd_genl_size_set(struct genl_info *info, 
struct nbd_device *nbd)
        }
 
        if (bytes != config->bytesize || bsize != config->blksize)
-               nbd_size_set(nbd, bsize, div64_u64(bytes, bsize));
+               nbd_set_size(nbd, bytes, bsize);
        return 0;
 }
 
-- 
2.29.2