vault backup: 2023-03-13 11:08:50

content/notes/05-filesystems.md

@@ -34,7 +34,10 @@ structure of directory
 
 soft vs hard links
 - hard link must always point to data - to delete a file with hard links you must also delete all the hard links
+	- link to _actual inode_
 - soft links can point to a non-existing file 
+	- link to file _name_
+	- can link incompatible file systems e.g., windows, xerox. i.e. fs's that dont use inodes
 
 advanced file attrs
 
@@ -44,5 +47,17 @@ journaling
  - logs changes to journal before writing
  - impact on performance requires data be written twice
  - **question** why not just write a description of the change
+ - all or nothing operations: ensure consistency
+ - 
+
+creating FS demo
+- `# dd if=/dev/zero of=loopbackfile.img bs=100M count=10 `
+- `# du -sh loopbackfile.img `
+- `# losetup -fP loopbackfile.img `
+- `# losetup –a `
+- `# mkfs.ext4 /root/loopbackfile.img `
+- `# mkdir /loopfs `
+- `# df -hP /loopfs/ `
+- `# mount -o loop /dev/loop0 /loop`
+- `# mount | grep loop`
 
-creating FS demo