Matthew Wilcox <willy@xxxxxxxxxxxxx> writes: > On Sat, Aug 29, 2020 at 11:23:34PM +0200, Florian Margaine wrote: >> Al Viro <viro@xxxxxxxxxxxxxxxxxx> writes: >> >> > On Fri, Aug 28, 2020 at 10:40:35PM +0200, Florian Margaine wrote: >> >> There's currently this seemingly unnecessary limitation that rename() >> >> cannot work over bind mounts of the same filesystem, >> > >> > ... is absolutely deliberate - that's how you set a boundary in the >> > tree, preventing both links and renames across it. >> >> Sorry, I'm not not sure I understand what you're saying. > > Al's saying this is the way an administrator can intentionally prevent > renames. Ah, ok. Thanks! > >> /* >> * FICLONE/FICLONERANGE ioctls enforce that src and dest files are on >> * the same mount. Practically, they only need to be on the same file >> * system. >> */ >> if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) >> return -EXDEV; > > clone doesn't change the contents of a file, merely how they're laid out > on storage. There's no particular reason for an administrator to > prohibit clone across mount points.
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