Messages in this thread | | | Date | Sat, 15 Aug 2009 09:12:15 -0400 | From | Mark Lord <> | Subject | Re: Discard support (was Re: [PATCH] swap: send callback when swap slot is freed) |
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Greg Freemyer wrote: > > What filesystems does your script support? Running a tool like this > in the middle of the night makes a lot of since to me even from the > perspective of many / most enterprise users. ..
It is designed to work on any *mounted* filesystem that supports the fallocate() system call. It uses fallocate() to reserve the free space in a temporary file without any I/O, and then FIEMAP/FIBMAP to get the block lists from the fallocated file, and then SGIO/ATA_16:TRIM to discard the space, before deleting the fallocated file.
Tested by me on ext4 and xfs. btrfs has a bug that prevents the fallocate from succeeding at present, but CM say's they're trying to fix that.
It will also work on *unmounted" ext2/ext3/ext4 filesystems, using dumpe2fs to get the free lists, and on xfs using xfs_db there.
HFS(+) support is coming as well.
Not currently compatible with LVM 1/2, or with some distros that use imaginary device names in /proc/mounts --> I'm working on those issues.
> ps: I tried to pull wiper.sh straight from sourceforge, but I'm > getting some crazy page asking all sorts of questions and not letting > me bypass it. I hope sourceforge is broken. The other option is they > meant to do this. :( ..
That's weird. It should just be a simple click/download, though you will need to also upgrade hdparm to the latest version.
Cheers
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