On Thu, Apr 10, 2008 at 06:41:18PM -0400, david m. richter wrote: > On Thu, 10 Apr 2008, david m. richter wrote: > > > On Thu, 10 Apr 2008, Brian De Wolf wrote: > > > > > Recently we've been prototyping serving Solaris ZFS exports via NFSv4 to some > > > Linux hosts. These will some day be exposed to general users, so I've been > > > testing things to see if I can break them. Anyway, it seems that nfs4_getfacl > > > is only able to read ACLs with up to 208 entries. nfs4_setfacl is able to > > > insert a 209th entry, but any attempts to view or edit the ACLs after that > > > fail with: > > > > > > Failed getxattr operation > > > : Input/output error > > > > > > There are two ways to make the ACLs readable again: > > > 1) Have someone log in to the Solaris box and remove some of the entries > > > 2) Reset the ACLs using nfs4_setfacl -s `some spec` > > > > > > Has anyone run into this issue before? Is it fixable? I didn't reach the > > > same problem locally on the Solaris box, nor on another Solaris box with the > > > same NFS mount, so it looks like it's a problem specific to Linux. Here's the > > > versions of relevant packages on the test box running Gentoo (did I miss > > > any?): > > > Kernel: 2.6.23-gentoo-r8 > > > nfs-utils-1.1.0-r1 > > > attr-2.4.39 > > > nfs4-acl-tools-0.3.2 > > > > honestly, this probably stems from some naive, unrevisited <ahem> > > assumptions still lingering nfs4-acl-tools code that need fixing. at the > > -very- least, nfs4_setfacl could save the original ACL and attempt to > > restore it if the setxattr() call fails. > > sorry, misread part of your letter the first time around -- it'd > be very bizarre if nfs4_getfacl influenced the ACL in any way, so i > suspect that something's going awry with nfs4_setfacl. seeing such an > arbitrary limit of 208 or 209 ACEs looks like the tools being dumb. I haven't looked at this code in a while. From a quick look.... It appears the kernel limits ACLs to 64K (xdr-encoded). One ACE has length 16 + (length of user/group name rounded up to multiple of 4) But to be hitting that limit with 208 entries I think you'd have to have user/group names (including domain) of about 300 characters. Anyway, strace'ing nfs4_getfacl/nfs4_setfacl would verify whether the error was coming from the kernel or the tools. I have to ask: how many acl entries do you need? --b. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
