nfs: fix v4.2 SEEK on files over 2 gigs

We're incorrectly assigning a loff_t return to an int.  If SEEK_HOLE or
SEEK_DATA returns an offset over 2^31 then the application will see a
weird lseek() result (usually -EIO).

Cc: stable@vger.kernel.org
Fixes: bdcc2cd14e4e "NFSv4.2: handle NFS-specific llseek errors"
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Reviewed-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index d731bbf..0f020e4 100644 (file)
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -175,10 +175,12 @@ loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 {
        struct nfs_server *server = NFS_SERVER(file_inode(filep));
        struct nfs4_exception exception = { };
-       int err;
+       loff_t err;
 
        do {
                err = _nfs42_proc_llseek(filep, offset, whence);
+               if (err >= 0)
+                       break;
                if (err == -ENOTSUPP)
                        return -EOPNOTSUPP;
                err = nfs4_handle_exception(server, err, &exception);