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-rw-r--r--Documentation/filesystems/btrfs.txt13
1 files changed, 7 insertions, 6 deletions
diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index 5dd282dda55c..ce487a2a88f8 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -38,7 +38,7 @@ Mount Options
=============
When mounting a btrfs filesystem, the following option are accepted.
-Unless otherwise specified, all options default to off.
+Options with (*) are default options and will not show in the mount options.
alloc_start=<bytes>
Debugging option to force all block allocations above a certain
@@ -138,12 +138,13 @@ Unless otherwise specified, all options default to off.
Disable support for Posix Access Control Lists (ACLs). See the
acl(5) manual page for more information about ACLs.
+ barrier(*)
nobarrier
- Disables the use of block layer write barriers. Write barriers ensure
- that certain IOs make it through the device cache and are on persistent
- storage. If used on a device with a volatile (non-battery-backed)
- write-back cache, this option will lead to filesystem corruption on a
- system crash or power loss.
+ Enable/disable the use of block layer write barriers. Write barriers
+ ensure that certain IOs make it through the device cache and are on
+ persistent storage. If disabled on a device with a volatile
+ (non-battery-backed) write-back cache, nobarrier option will lead to
+ filesystem corruption on a system crash or power loss.
nodatacow
Disable data copy-on-write for newly created files. Implies nodatasum,