The sblkdev's discuss from codeimp

sblkdev's Issues

why the device size in `lsblk` and `df` not equal?

the module param is given 100M size and lsblk is 100M too, but df shows only 89M， why they are not equal?
the following is the commands and outputs from my machine

root@suse ~/sblkdev (master)# insmod sblkdev.ko catalog="sblkdev1,204800"
root@suse ~/sblkdev (master)# lsblk | sed -n '1p;$p'
NAME     MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sblkdev1 253:0    0  100M  0 disk 
root@suse ~/sblkdev (master)# 
root@suse ~/sblkdev (master)# mkfs.ext4 /dev/sblkdev1
mke2fs 1.47.0 (5-Feb-2023)
Creating filesystem with 102400 1k blocks and 25584 inodes
Filesystem UUID: c3e0c089-d5e9-4e2f-ba31-e5d4514c589d
Superblock backups stored on blocks: 
        8193, 24577, 40961, 57345, 73729

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done 

root@suse ~/sblkdev (master)# mount /dev/sblkdev1 /mnt
root@suse ~/sblkdev (master)# df -h | sed -n '1p;$p'
Filesystem      Size  Used Avail Use% Mounted on
/dev/sblkdev1    89M   46K   82M   1% /mnt
root@suse ~/sblkdev (master)# fdisk -l /dev/sblkdev1 
Disk /dev/sblkdev1: 100 MiB, 104857600 bytes, 204800 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
root@suse ~/sblkdev (master)#

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