btrfs-scrub: add page (#5104)

pages/linux/btrfs-scrub.md

@@ -0,0 +1,29 @@
+# btrfs scrub
+
+> Scrub btrfs filesystems to verify data integrity.
+> It is recommended to run a scrub once a month.
+> More information: <https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-scrub>.
+
+- Start a scrub:
+
+`sudo btrfs scrub start {{path/to/btrfs_mount}}`
+
+- Show the status of an ongoing or last completed scrub:
+
+`sudo btrfs scrub status {{path/to/btrfs_mount}}`
+
+- Cancel an ongoing scrub:
+
+`sudo btrfs scrub cancel {{path/to/btrfs_mount}}`
+
+- Resume a previously cancelled scrub:
+
+`sudo btrfs scrub resume {{path/to/btrfs_mount}}`
+
+- Start a scrub, but wait until the scrub finishes before exiting:
+
+`sudo btrfs scrub start -B {{path/to/btrfs_mount}}`
+
+- Start a scrub in quiet mode (does not print errors or statistics):
+
+`sudo btrfs scrub start -q {{path/to/btrfs_mount}}`