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authorJiro SEKIBA <jir@unicus.jp>2010-01-30 18:06:35 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-02-13 12:26:02 +0900
commite902ec9906e844f4613fa6190c6fa65f162dc86e (patch)
treeee0ea829ae04a30fb01c119f050a3967304e55ba /Documentation/filesystems
parent724e6d3fe8003c3f60bf404bf22e4e331327c596 (diff)
nilfs2: issue discard request after cleaning segments
This adds a function to send discard requests for given array of segment numbers, and calls the function when garbage collection succeeded. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/nilfs2.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/filesystems/nilfs2.txt b/Documentation/filesystems/nilfs2.txt
index 839efd8a8a8..cf6d0d85ca8 100644
--- a/Documentation/filesystems/nilfs2.txt
+++ b/Documentation/filesystems/nilfs2.txt
@@ -74,6 +74,9 @@ norecovery Disable recovery of the filesystem on mount.
This disables every write access on the device for
read-only mounts or snapshots. This option will fail
for r/w mounts on an unclean volume.
+discard Issue discard/TRIM commands to the underlying block
+ device when blocks are freed. This is useful for SSD
+ devices and sparse/thinly-provisioned LUNs.
NILFS2 usage
============