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block: remove the bd_block_size field from struct block_device

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We can trivially calculate the block size from the inodes i_blkbits
variable.  Use that instead of keeping two redundant copies of the
information in slightly different formats.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-06-26 10:01:55 +02:00 committed by Jens Axboe
parent 5ff9f19231
commit 6b7b181b67
3 changed files with 3 additions and 9 deletions
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9
fs/block_dev.c
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@ -105,10 +105,7 @@ EXPORT_SYMBOL(invalidate_bdev);
static void set_init_blocksize(struct block_device *bdev)
{
unsigned bsize = bdev_logical_block_size(bdev);
bdev->bd_block_size = bsize;
bdev->bd_inode->i_blkbits = blksize_bits(bsize);
bdev->bd_inode->i_blkbits = blksize_bits(bdev_logical_block_size(bdev));
}
int set_blocksize(struct block_device *bdev, int size)
@ -122,9 +119,8 @@ int set_blocksize(struct block_device *bdev, int size)
return -EINVAL;
/* Don't change the size if it is same as current */
if (bdev->bd_block_size != size) {
if (bdev->bd_inode->i_blkbits != blksize_bits(size)) {
sync_blockdev(bdev);
bdev->bd_block_size = size;
bdev->bd_inode->i_blkbits = blksize_bits(size);
kill_bdev(bdev);
}
@ -889,7 +885,6 @@ struct block_device *bdget(dev_t dev)
bdev->bd_contains = NULL;
bdev->bd_super = NULL;
bdev->bd_inode = inode;
bdev->bd_block_size = i_blocksize(inode);
bdev->bd_part_count = 0;
bdev->bd_invalidated = 0;
inode->i_mode = S_IFBLK;

1
include/linux/blk_types.h
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@ -33,7 +33,6 @@ struct block_device {
struct list_head bd_holder_disks;
#endif
struct block_device * bd_contains;
unsigned bd_block_size;
u8 bd_partno;
struct hd_struct * bd_part;
/* number of times partitions within this device have been opened. */

2
include/linux/blkdev.h
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@ -1543,7 +1543,7 @@ static inline unsigned int blksize_bits(unsigned int size)
static inline unsigned int block_size(struct block_device *bdev)
{
return bdev->bd_block_size;
return 1 << bdev->bd_inode->i_blkbits;
}
int kblockd_schedule_work(struct work_struct *work);