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[dm-devel] trim support (discard)



Hi list,

It is the first time the i write to this list.
I asked on the ext4 ml and they told me to ask here.

I use the kernel 2.6.37 with cryptsetup and lvm on a intel ssd. 
In the logfile after booting i see this entry:
EXT4-fs (dm-1): re-mounted. Opts: discard,errors=remount-ro
EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: discard
EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts: discard
EXT4-fs (dm-2): mounted filesystem with ordered data mode. Opts: discard
EXT4-fs warning (device dm-1): ext4_issue_discard:2619: discard not
supported, disabling
EXT4-fs warning (device dm-3): ext4_issue_discard:2619: discard not
supported, disabling
EXT4-fs warning (device dm-3): ext4_issue_discard:2619: discard not
supported, disabling
EXT4-fs warning (device dm-3): ext4_issue_discard:2619: discard not
supported, disabling
EXT4-fs (sda1): re-mounted. Opts: discard,commit=0
EXT4-fs (dm-3): re-mounted. Opts: discard,commit=0
EXT4-fs (dm-2): re-mounted. Opts: discard,commit=0

The mount command shows:
/dev/mapper/System2-root_ssd on / type ext2
(rw,noatime,errors=remount-ro,barrier=1,stripe=32,data=ordered,discard)
and the corresponding entry from fstab:
UUID="635a1ad9-9ebb-4d1e-b8c3-30e11148bd92"     /                   ext4
noatime,discard,errors=remount-ro               0       1

So, no discard support so far.
Then i try the wiper.sh script and i get:
wiper.sh: Linux SATA SSD TRIM utility, version 3.1, by Mark Lord.
/dev/dm-1: unable to reliably determine the underlying physical device
name, aborting

Its there in near future the discard support on the LVM?

Viele GrĂ¼sse
Jens Kasten


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