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authorEric Sandeen <sandeen@redhat.com>2009-11-19 14:25:42 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-11-19 14:25:42 -0500
commit5328e635315734d42080de9a5a1ee87bf4cae0a4 (patch)
tree4952c04c9b1faec9a3c82a3743805efad05ed96e /Documentation/filesystems
parent2bba702d4f88d7b010ec37e2527b552588404ae7 (diff)
ext4: make trim/discard optional (and off by default)
It is anticipated that when sb_issue_discard starts doing real work on trim-capable devices, we may see issues. Make this mount-time optional, and default it to off until we know that things are working out OK. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/ext4.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 6d94e0696f8c..26904ff6d61b 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -353,6 +353,12 @@ noauto_da_alloc replacing existing files via patterns such as
353 system crashes before the delayed allocation 353 system crashes before the delayed allocation
354 blocks are forced to disk. 354 blocks are forced to disk.
355 355
356discard Controls whether ext4 should issue discard/TRIM
357nodiscard(*) commands to the underlying block device when
358 blocks are freed. This is useful for SSD devices
359 and sparse/thinly-provisioned LUNs, but it is off
360 by default until sufficient testing has been done.
361
356Data Mode 362Data Mode
357========= 363=========
358There are 3 different data modes: 364There are 3 different data modes: