On 2015-06-30 17:45, Dave Chinner wrote:
+! on this suggestion, I find that there are only a few files that I don't want autodefrag enabled for, and I do want it on pretty much everything else. Furthermore, userspace API consistency is a Good Thing.On Tue, Jun 30, 2015 at 09:32:20AM -0700, Omar Sandoval wrote:In some cases, we may not want to enable automatic defragmentation for the whole filesystem with the "autodefrag" mount option but we still want to defragment specific files or directories. Add an inode flag which allows us to do specify that. Signed-off-by: Omar Sandoval <osandov@xxxxxx> --- Resending this because I didn't send it to fsdevel or linux-api last time and I'm adding a new user-facing inode flag.XFS has a "no defrag" inode flag to tell the defragmenter not to defrag the file. (XFS_XFLAG_NODEFRAG, see xfsctl(3)). With the ext4 project quota work, this flag and interface is being pulled up to the VFS, so perhaps it would be a good idea to turn this around the other way? i.e. autodefrag is the default behaviour, and the inode contains an inheritable "no defrag" flag to prevent defrag so that we have the same flag, API and behaviour across filesystems?
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