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-rw-r--r--Documentation/btrfs-scrub.txt6
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/btrfs-scrub.txt b/Documentation/btrfs-scrub.txt
index 7b27d63c..b8d3b658 100644
--- a/Documentation/btrfs-scrub.txt
+++ b/Documentation/btrfs-scrub.txt
@@ -18,7 +18,7 @@ SUBCOMMAND
----------
*start* [-BdqrRf] [-c <ioprio_class> -n <ioprio_classdata>] <path>|<device>::
Start a scrub on all devices of the filesystem identified by <path> or on
-a single <device>.
+a single <device>. If a scrub is already running, the new one fails.
+
Without options, scrub is started as a background process.
Progress can be obtained with the *scrub status* command. Scrubbing
@@ -47,8 +47,8 @@ manpage).
-n <ioprio_classdata>::::
Set IO priority classdata (see `ionice`(1) manpage).
-f::::
-force to check whether scrub has started or resumed in userspace.
-this is useful when scrub stat record file is damaged.
+Force starting new scrub even if a scrub is already running.
+This is useful when scrub stat record file is damaged.
*cancel* <path>|<device>::
If a scrub is running on the filesystem identified by <path>, cancel it.