nfsd: add a nfserrno mapping for -E2BIG to nfserr_fbig

I saw this pop up with some pynfs testing:

    [  123.609992] nfsd: non-standard errno: -7

...and -7 is -E2BIG. I think what happened is that XFS returned -E2BIG
due to some xattr operations with the ACL10 pynfs TEST (I guess it has
limited xattr size?).

Add a better mapping for that error since it's possible that we'll need
it. How about we convert it to NFSERR_FBIG? As Bruce points out, they
both have "BIG" in the name so it must be good.

Also, turn the printk in this function into a WARN() so that we can get
a bit more information about situations that don't have proper mappings.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index eff49552cdc8..b19c7e8bf64c 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -717,6 +717,7 @@ nfserrno (int errno)
                 { nfserr_noent, -ENOENT },
                 { nfserr_io, -EIO },
                 { nfserr_nxio, -ENXIO },
+                { nfserr_fbig, -E2BIG },
                 { nfserr_acces, -EACCES },
                 { nfserr_exist, -EEXIST },
                 { nfserr_xdev, -EXDEV },
@@ -751,7 +752,7 @@ nfserrno (int errno)
                 if (nfs_errtbl[i].syserr == errno)
                         return nfs_errtbl[i].nfserr;
         }
-        printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
+        WARN(1, "nfsd: non-standard errno: %d\n", errno);
         return nfserr_io;
 }