On Fri, Nov 11, 2016 at 1:05 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > On Thu, Nov 10, 2016 at 11:02:21PM +0000, Al Viro wrote: >> On Fri, Nov 11, 2016 at 12:44:43AM +0200, Amir Goldstein wrote: >> > If work dir and upper dir have a common parent, then it >> > is safe to move files between them without taking the super block >> > s_vfs_rename_mutex. >> > >> > Since both upper dir and work dir (as well as $workdir/work) >> > are delete locked on overlay mount, they cannot be moved. >> >> Do explain. What do you mean, "delete locked" and why exactly can't they >> be moved? > That is explained in commit message of the first 2 patches, but foremost I would like to say that the name "delete locked" is just the best of all the bad choices for names I came up with, so I am expecting better name suggestions. The concept is to pin the entry so that it cannot be moved, so can have certain guaranties about the stability of the directories topology. > More specifically, what makes you think that may_delete() is called before > any change of parent? Because it is checked at the beginning of vfs_rename() and in order to change a parent, an entry needs to be renamed. no? What am I missing? -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
