On Thu, 23 Jul 2009 13:36:29 +0200 Ludwig Nussel wrote: > Hi, > > When using 'real' file systems on removable storage devices such as > hard disks or usb sticks people quickly face the problem that their > Linux users have different uids on different machines. Therefore one > cannot modify or even read files created on a different machine > without running chown as root or storing everything with mode 777. > Simple file systems such as vfat don't have that problem as they > don't store file ownership information and one can pass the uid > files should belong to as mount option. > > The following two patches (for 2.6.31-rc4) therefore implement the > uid mount option for ext2 and ext3 to make them actually useful on > removable media. My implementation just writes uid 0 to disk for > files that are owned by the specified user. In read direction files > with uid 0 appear as being owned by the specified user. > > In an ideal world this would probably be implemented as vfs feature > rather than having it in every single file system. > > Anyways, AFAICT the method works just fine for ext2. I'm not sure > about the ext3 patch though as ext3 has that ext3_setattr() function > for journaling. I don't know if the uid should better be mangled > there instead. Hi, Please document the mount options in Documentation/filesystems/ext?.txt . Thanks. --- ~Randy LPC 2009, Sept. 23-25, Portland, Oregon http://linuxplumbersconf.org/2009/ -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
