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docs/linux/filesystems.md

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+
+# LVM
+#### Extend
+```bash
+lvextend -L+1G /dev/vg4/homevol
+```
+
+# Btrfs
+#### Resize
+```bash
+btrfs filesystem resize max /mnt/dmp/
+```
+#### Defragment / compress
+```bash
+btrfs filesystem defragment -v -clzo /boot/*
+```
+#### Set RO / RW
+```bash
+btrfs property set -f . ro false
+btrfs property set -f . ro true
+```
+#### Create shapshot
+```bash
+btrfs subvolume snapshot xyz xyz-snapshot-path-name
+```
+#### Delete shapshot
+```bash
+btrfs subvolume delete xyz-snapshot-path-name
+```
+
+# Ext4
+#### Resize
+```bash
+resize2fs /dev/device [size]
+```
+
+#### if superblock fail
+```bash
+dumpe2fs /dev/sda5 | grep -i backup
+fsck -b 32768 /dev/sda5
+```