fsadm: add page (#17877)

pages/linux/fsadm.md

@@ -0,0 +1,24 @@
+# fsadm
+
+> Check or resize a filesystem on a device.
+> More information: <https://manned.org/fsadm>.
+
+- Check a filesystem for errors:
+
+`fsadm check {{/dev/vg_name/lv_name}}`
+
+- Perform a dry-run resize to a specific size (no changes made):
+
+`fsadm {{[-n|--dry-run]}} resize {{/dev/vg_name/lv_name}} {{10G}}`
+
+- Grow a filesystem to fill the entire device (omit the size):
+
+`fsadm resize {{/dev/vg_name/lv_name}}`
+
+- Resize the filesystem and the underlying logical volume together:
+
+`fsadm {{[-l|--lvresize]}} resize {{/dev/vg_name/lv_name}} {{100G}}`
+
+- For ext2/3/4, unmount and resize offline:
+
+`fsadm {{[-e|--ext-offline]}} resize {{/dev/vg_name/lv_name}} {{20G}}`