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authorQu Wenruo <quwenruo@cn.fujitsu.com>2014-01-06 05:58:27 +0400
committerChris Mason <clm@fb.com>2014-01-29 01:20:17 +0400
commite07a2ade4426a2cbafae4018aa7b6944bb627a6e (patch)
tree7aebc7d70571ee40fb545dd8e85b492ad3b2da27 /Documentation/filesystems/btrfs.txt
parentfc0ca9af180b91aad2fbf2fe3b16a12e1e05a760 (diff)
downloadlinux-e07a2ade4426a2cbafae4018aa7b6944bb627a6e.tar.xz
btrfs: Add nodiscard mount option.
Add nodiscard mount option to disable discard with remount option. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'Documentation/filesystems/btrfs.txt')
-rw-r--r--Documentation/filesystems/btrfs.txt7
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index e87609a4e21c..7254cf501391 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -98,9 +98,12 @@ Options with (*) are default options and will not show in the mount options.
can be avoided. Especially useful when trying to mount a multi-device
setup as root. May be specified multiple times for multiple devices.
+ nodiscard(*)
discard
- Issue frequent commands to let the block device reclaim space freed by
- the filesystem. This is useful for SSD devices, thinly provisioned
+ Disable/enable discard mount option.
+ Discard issues frequent commands to let the block device reclaim space
+ freed by the filesystem.
+ This is useful for SSD devices, thinly provisioned
LUNs and virtual machine images, but may have a significant
performance impact. (The fstrim command is also available to
initiate batch trims from userspace).