On 14-04-03 12:33 PM, Mark Lord wrote: > This commit from linux-3.14 breaks our NFS-root clients here: > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6e14b46b91fee8a049b0940333ce13a820beaaa5 > > > - *p++ = htonl((u32) stat->mode); > + *p++ = htonl((u32) (stat->mode & S_IALLUGO)); > > > Reverting the one-liner above (on the server) fixes it for us, > as does reverting back to linux-3.13.8 on the server. > > The NFS-root clients are on PowerPC (big-endian) architecture, > running linux-3.12.16. The NFS server is on an Intel PC running linux-3.14. > > ACL is completely disabled on server and client, > and we're using NFSv2/v3. No support for v4. > > I instrumented the function to see what other bits were being cleared > by the (stat->mode & S_IALLUGO) masking. The results are attached. .. Looking into the (previously attached) trace, the bits that seem to be getting chopped most often are S_IFREG (0x8000) and S_IFDIR (0x4000). It appears that one/both of those are needed for mounting nfsroot. [ 2733.823753] encode_fattr: mode=0x000041ed mask=0x00000fff [ 2733.824217] encode_fattr: mode=0x000041ed mask=0x00000fff [ 2733.838769] encode_fattr: mode=0x000041ed mask=0x00000fff [ 2733.839175] encode_fattr: mode=0x0000a1ff mask=0x00000fff [ 2733.839895] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.840388] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.840431] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.841256] encode_fattr: mode=0x000041ed mask=0x00000fff [ 2733.841659] encode_fattr: mode=0x0000a1ff mask=0x00000fff [ 2733.842379] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.842825] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.842879] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.843876] encode_fattr: mode=0x000081ed mask=0x00000fff [ 2733.843924] encode_fattr: mode=0x000081ed mask=0x00000fff ... -- 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
