27. Devices and udev - Device Nodes - ¿Filesystem?

I don't understand why in Section 27. "Devices and udev", Page "Device Nodes", the illustrations shows a block "filesystem" between the blocks "block driver" and "block node"?
Looking at the "ls -l /dev" output before, the block node "sda" has the same major as its partition block nodes "sda1" and "sda2", and I believe this is completely independent of whatever filesystem-or-not the partition holds. Of course, in order to mount it, there should be a filesystem; but the pure "block node" of a partition should already show up in the VFS (under /etc) regardless of formatting (otherwise, how to run mkfs on it?).
Best Answer
-
Yes indeed, the order should be vfs<->fs<->node<->hw ; i.e., file system and node should be swapped. I think an redraw of the graphic at some point introduced the error. We will fix.
All scsi disks have major number 8, with varying minor numbers. In an MBR system you have 16 for each physical drive, for example on my system which currently has 4 disks:
c8:/>ls -l /dev/sd* brw-rw---- 1 root disk 8, 0 Feb 7 07:13 /dev/sda brw-rw---- 1 root disk 8, 1 Feb 7 07:13 /dev/sda1 brw-rw---- 1 root disk 8, 2 Feb 7 07:13 /dev/sda2 brw-rw---- 1 root disk 8, 16 Feb 7 07:13 /dev/sdb brw-rw---- 1 root disk 8, 17 Feb 7 07:13 /dev/sdb1 brw-rw---- 1 root disk 8, 18 Feb 7 07:13 /dev/sdb2 brw-rw---- 1 root disk 8, 32 Feb 7 07:13 /dev/sdc brw-rw---- 1 root disk 8, 33 Feb 7 07:13 /dev/sdc1 brw-rw---- 1 root disk 8, 34 Feb 7 07:13 /dev/sdc2 brw-rw---- 1 root disk 8, 48 Feb 7 07:13 /dev/sdd brw-rw---- 1 root disk 8, 49 Feb 7 07:13 /dev/sdd1 brw-rw---- 1 root disk 8, 51 Feb 7 07:13 /dev/sdd3 brw-rw---- 1 root disk 8, 53 Feb 7 07:13 /dev/sdd5 brw-rw---- 1 root disk 8, 54 Feb 7 07:13 /dev/sdd6
2
Categories
- 9.9K All Categories
- 29 LFX Mentorship
- 82 LFX Mentorship: Linux Kernel
- 469 Linux Foundation Boot Camps
- 267 Cloud Engineer Boot Camp
- 95 Advanced Cloud Engineer Boot Camp
- 43 DevOps Engineer Boot Camp
- 31 Cloud Native Developer Boot Camp
- 1 Express Training Courses
- 1 Express Courses - Discussion Forum
- 1.6K Training Courses
- 18 LFC110 Class Forum
- 4 LFC131 Class Forum
- 19 LFD102 Class Forum
- 133 LFD103 Class Forum
- 9 LFD121 Class Forum
- 60 LFD201 Class Forum
- LFD210 Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- 23 LFD254 Class Forum
- 545 LFD259 Class Forum
- 100 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 1 LFS145 Class Forum
- 20 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 1 LFS203 Class Forum
- 37 LFS207 Class Forum
- 296 LFS211 Class Forum
- 53 LFS216 Class Forum
- 45 LFS241 Class Forum
- 40 LFS242 Class Forum
- 33 LFS243 Class Forum
- 10 LFS244 Class Forum
- 27 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- 131 LFS253 Class Forum
- 967 LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 85 LFS260 Class Forum
- 124 LFS261 Class Forum
- 29 LFS262 Class Forum
- 78 LFS263 Class Forum
- 15 LFS264 Class Forum
- 10 LFS266 Class Forum
- 17 LFS267 Class Forum
- 16 LFS268 Class Forum
- 14 LFS269 Class Forum
- 194 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- 207 LFW211 Class Forum
- 148 LFW212 Class Forum
- 892 Hardware
- 213 Drivers
- 74 I/O Devices
- 44 Monitors
- 115 Multimedia
- 206 Networking
- 100 Printers & Scanners
- 85 Storage
- 747 Linux Distributions
- 88 Debian
- 64 Fedora
- 13 Linux Mint
- 13 Mageia
- 24 openSUSE
- 133 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 354 Ubuntu
- 469 Linux System Administration
- 38 Cloud Computing
- 68 Command Line/Scripting
- Github systems admin projects
- 93 Linux Security
- 77 Network Management
- 107 System Management
- 48 Web Management
- 62 Mobile Computing
- 22 Android
- 26 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 524 Off Topic
- 127 Introductions
- 210 Small Talk
- 19 Study Material
- 783 Programming and Development
- 257 Kernel Development
- 492 Software Development
- 919 Software
- 255 Applications
- 181 Command Line
- 2 Compiling/Installing
- 76 Games
- 316 Installation
- 46 All In Program
- 46 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)