add file-system article + small fixes

1 files changed, 26 insertions, 24 deletions

diff --git a/index.md b/index.md
index c2a7141..0cb15c5 100644
--- a/index.md
+++ b/index.md
@@ -7,6 +7,8 @@
 
 TODO: reference a mono font in the CSS
 
+TODO: do figures properly in CSS
+
 TODO: fix TOC CSS
 
 TODO: have a POSIX / UNIX / Linux section
@@ -30,37 +32,37 @@ The objective is to deeply understand the Linux ecosystem: how it boots, what
 are the different pieces, how do they integrate with one-another, what are the
 different choices available to us when building such a system, etc.
 
-Even though it is very rare to build these kinds of things "manually", I do
-think it is better to do it this way for educative purposes.
+Even though it's very rare to build these kinds of things "manually," I do
+think it's better to do it this way for educative purposes.
 
 However, in the practical work part, we will build a Linux system in an
-automated fashion, using [Buildroot](https://buildroot.org/), an well-known
+automated fashion, using [Buildroot](https://buildroot.org/), a well-known
 software in the industry for building embedded Linux systems.
 
 This document is intended to serve several functions:
 
 - As notes, if I talk too fast, or if you don't like to take
-  notes[^take-notes], or miss classes
+  notes[^take-notes], or miss classes.
 - It's likely that this website is going to be more detailed than the course,
   so it's useful you want to go further. You can also follow the links to go
-  even further
-- Should I miss some things while talking, this website should fix it
+  even further.
+- Should I miss some things while talking, this website should fix it.
 
 [^take-notes]:
-        {-} You really should be taking notes, it does help remembering
+        {-} You really should be taking notes, it does help remember.
 
 The Linux command-line
 ----------------------
 
 Main article: [CLI](cli.md)
 
-When we say "command-line interface", we usually mean the text-based program
+When we say "command-line interface," we usually mean the text-based program
 whose main purpose is to execute other commands. You input a program name, enter
 its arguments, press enter, and it will execute the said program with said
 arguments.
 
 In reality, the UNIX command-line is more complicated than that, but that also
-makes it much more powerful. See the main article if you want to unlocking this
+makes it much more powerful. See the main article if you want to unlock this
 power.
 
 <!--
@@ -77,23 +79,23 @@ Main article: [kernel](kernel.md)
 The Linux kernel is the glue between the hardware and the user space
 programs.
 
-Each time a user program needs to access the hardware (e.g. hard drives,
-network card), it has to go through the kernel through system calls (e.g.
-read/write on a file, `sendto`/`recvfrom` on a socket).
+Each time a user program needs to access the hardware (for example, hard
+drives, network card), it has to go through the kernel through system calls
+(for example, read/write on a file, `sendto`/`recvfrom` on a socket).
 
 It also decides how processes are run, and is in charge of enforcing
 security.
 
-The filesystem
---------------
+The file system
+---------------
 
-TODO: link to main article
+Main article: [file system](file-system.md)
 
-A filesystem is a way of organizing data in the form of files and
-directories. Another way to see it is that since hard drives stores only
-bytes, it is the responsibility of the filesystem to organize these
+A file system is a way of organizing data in the form of files and
+directories. Another way to see it, is that since hard drives stores only
+bytes, it's the responsibility of the file system to organize these
 bytes such that the kernel can interpret them as files and directories
-and present them to the user (TODO: link mount).
+and present them to the user.
 
 Init
 ----
@@ -103,21 +105,21 @@ TODO: link to main article
 The init program is the first user-space program that the kernel
 launches on boot. Every other program is launched either by init or a
 child of init (direct child or transitive child). Since init is the
-first program launched it always has a PID of 1.
+first program launched, it always has a PID of 1.
 
 TODO: link to first steps to "user-space booting"
 
-Special filesystems
--------------------
+Special file systems
+--------------------
 
-Some filesystem aren't used to store data, but instead to communicate
+Some file systems aren't used to store data, but instead to communicate
 with the kernel. This allows doing various things using only the
 `read`, `write`, and other file-related system calls.
 
 For example, you can list USB devices by listing the content of the
 directory `/sys/bus/usb/devices/`.
 
-TODO: add links to article with list of common special filesystems.
+More info in the [file system](file-system.md#special-file-systems) article.
 
 Networking
 ----------