Linux block device driver (v)--operation of block device application layer

One: Load good sbull drive

[Email protected]:/# ls/dev/sbull-l brw-r--r--1 root root 254, Mar 08:25/dev/sbull [email protected]:/#

You can see that the Sbull file property is a block device, the main device number is 254, the secondary device number is 16

Second: Partition the device

[Email protected]:/# fdisk/dev/sbull [266.720648] sbull:unknown partition table Welcome to fdisk (Util-linux 2.24.1). Changes'll remaininchMemory only, until the decide to write them. Be careful beforeusingThe Write command. Device does not contain a recognized partition table. Created ANewDOS disklabel with disk identifier 0xb90ed7e4. Command (M forHelp): M Help:dos (MBR) A toggle a bootable flag B edit nested BSD disklabel C toggle the DOS compatibility flag Generic D Delete a partition L list known partition types n Add aNewPartition P print the partition table T change a partition type V verify the partition table Misc m print ThisMenu U change display/entry units x extra functionality (experts only) Save & exit W Write table to disk and exit Q qu It without saving changes Create aNewLabel G Create aNewEmpty GPT partition Table G Create aNewEmpty SGI (IRIX) partition table O Create aNewEmpty DOS partition Table s Create aNewEmpty Sun partition Table Command (M forHelp): N//Enter N to add a new partitionPartition Type:p Primary (0 primary, 0 extended, 4 free) e extended Select (default p): P//Primary partition Partition Nu Mber (1-4, default 1): 1//This partition is the first sector (1-1023, default 1): 1///The partition starting sector last sector, +sectors or +size{k,m,g,t,p} (1-1023, default 1023): 1023//end sector of the partition Created a new partition 1 of type ' Linux ' and of size 511.5 KiB. Command (M for help): w//Save and exit the partition table has been altered. Calling IOCTL () to re-read parti[303.589984] sbull:sbull1 tion table. Syncing disks.

View partitions: The author made two partitions

[Email protected]:/# ls/dev/sbull*
/dev/sbull/dev/sbull1/dev/sbull2
[email protected]:/ #

Two: Format file system

[email protected]:/# mkfs.ext4/dev/sbull2mke2fs 1.42.4 (12-June-2012) Filesystem label=os type:linuxblock size=1024 (log=0) Fragment size=1024 (log=0) stride=0 blocks, Stripe width=0 blocks64 i Nodes, 504 BLOCKS25 blocks (4.96%) reserved for the Super Userfirst data block=1maximum Filesyst EM blocks=5242881 block group8192 blocks per group, 8192 fragments per group64 inodes per groupallocating group Tables:do Ne Writing inode tables:done Filesystem too small for a journalwriting superblocks and Filesyst EM accounting Information:done

Three: Hanging on file system

[email protected]:/# mount/dev/sbull1/tmp/mnt/sbull/mount:mounting/dev/sbull1 on/tmp/mnt/sbull/failed:invalid argument [email protected]:/# mount/dev/sbull2/tmp/mnt/sbull/[832.527053] Ext4-fs (sbull2): couldn' t mou NT as ext3 due to feature incompatibilities [832.557133] Ext4-fs (sbull2): couldn 'T mount as ext2 due to FE Ature incompatibilities [832.588127] Ext4-fs (SBULL2): Mounted filesystem without journal. Opts: (null) [email protected]:/# [Email protected]:/#

The above completed the application layer of the block device hanging in operation, the next can be directly in the/tmp/mnt/sbull directory to operate the

Linux block device driver (v)--operation of block device application layer