Never mind, I didn't notice this was only for hard linking directories... Cheers, Andreas On 2011-01-02, at 22:20, Andreas Dilger <adilger@xxxxxxxxx> wrote: > Actually, I think it is required by POSIX that EXDEV is returned when cross-linking files. For mv calling rename() at least it uses a return EXDEV to copy the file to the target filesystem instead of just giving up and returning an error. It may be other applications like tar have a similar dependency for link(). > > Cheers, Andreas > > On 2011-01-02, at 16:21, Ted Ts'o <tytso@xxxxxxx> wrote: > >> I was going through some old patches in the ext4 patchwork list, and >> came across this. It looks like this patch has never been applied to >> mainline. If it's a "clear improvement", any reason not to submit it? >> >> Regards, >> >> - Ted >> >> On Mon, Sep 27, 2010 at 03:14:00PM +0200, Andreas Gruenbacher wrote: >>> >>> Ah, you mean this: >>> >>> --- a/fs/namei.c >>> +++ b/fs/namei.c >>> @@ -2450,7 +2450,9 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de >>> if (!inode) >>> return -ENOENT; >>> >>> - error = may_create(dir, new_dentry, S_ISDIR(inode->i_mode)); >>> + if (S_ISDIR(inode->i_mode)) >>> + return -EPERM; >>> + error = may_create(dir, new_dentry, 0); >>> if (error) >>> return error; >>> >>> @@ -2464,8 +2466,6 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de >>> return -EPERM; >>> if (!dir->i_op->link) >>> return -EPERM; >>> - if (S_ISDIR(inode->i_mode)) >>> - return -EPERM; >>> >>> error = security_inode_link(old_dentry, dir, new_dentry); >>> if (error) >>> >>> This is a clear improvement; I don't think it matters that user-space will >>> get -EPERM instead of -EXDEV when trying to hard-link a directory across >>> devices. >>> >>> Thanks, >>> Andreas >> -- >> 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 > -- > 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 -- 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
