On Mon, 2012-01-09 at 11:12 -0600, Eric Sandeen wrote: > What kernel? ierdnac-hp ~ # uname -a Linux ierdnac-hp 3.1.6-pf-c220 #1 SMP PREEMPT Mon Jan 2 12:59:38 EET 2012 x86_64 Intel(R) Core(TM) i3 CPU M 380 @ 2.53GHz GenuineIntel GNU/Linux > If it's a recent kernel, here is the logic which controls whether to show it: > > if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) > seq_puts(seq, ",discard"); > > i.e. if "discard" is in the default mount options for the fs, it is not > shown, by design - although I am not 100% sure why that design decision > was made; that logic was explicitly added here: Indeed: ierdnac-hp ~ # tune2fs -l /dev/sda3|grep discard ierdnac-hp ~ # ierdnac-hp ~ # cat /proc/mounts |grep discard /dev/root / ext4 rw,noatime,errors=remount-ro,user_xattr,acl,barrier=0,data=writeback,discard 0 0 Thank you for clarifing this ! -- Andrei Popa (+4) 0741.57.80.90
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