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| author | Eric Sandeen <sandeen@redhat.com> | 2009-11-19 14:25:42 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-14 08:07:42 -0800 |
| commit | c46e04b9e788d6abed811128aa4e61dc0996509c (patch) | |
| tree | 67c9cd5ce91b7568024f5ef8cf172366ac99d78b /Documentation | |
| parent | 648d9cddf46454ef6aad9f8faf1dd051543647dd (diff) | |
| download | lwn-c46e04b9e788d6abed811128aa4e61dc0996509c.tar.gz lwn-c46e04b9e788d6abed811128aa4e61dc0996509c.zip | |
ext4: make trim/discard optional (and off by default)
(cherry picked from commit 5328e635315734d42080de9a5a1ee87bf4cae0a4)
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/ext4.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt index 7be02ac5fa36..4f60b4f876d6 100644 --- a/Documentation/filesystems/ext4.txt +++ b/Documentation/filesystems/ext4.txt @@ -338,6 +338,12 @@ noauto_da_alloc replacing existing files via patterns such as system crashes before the delayed allocation blocks are forced to disk. +discard Controls whether ext4 should issue discard/TRIM +nodiscard(*) commands to the underlying block device when + blocks are freed. This is useful for SSD devices + and sparse/thinly-provisioned LUNs, but it is off + by default until sufficient testing has been done. + Data Mode ========= There are 3 different data modes: |