nfsd/blocklayout: accept any minlength

Recent Linux clients have started to send GETLAYOUT requests with
minlength less than blocksize.

Servers aren't really allowed to impose this kind of restriction on
layouts; see RFC 5661 section 18.43.3 for details.

This has been observed to cause indefinite hangs on fsx runs on some
clients.

Cc: stable@vger.kernel.org
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
index cdefaa331a0719e88df91ef7c04c32706ae199a1..c29d9421bd5e1f8c890178c6ec961899b319ceef 100644 (file)
--- a/fs/nfsd/blocklayout.c
+++ b/fs/nfsd/blocklayout.c
@@ -56,14 +56,6 @@ nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
        u32 device_generation = 0;
        int error;
 
-       /*
-        * We do not attempt to support I/O smaller than the fs block size,
-        * or not aligned to it.
-        */
-       if (args->lg_minlength < block_size) {
-               dprintk("pnfsd: I/O too small\n");
-               goto out_layoutunavailable;
-       }
        if (seg->offset & (block_size - 1)) {
                dprintk("pnfsd: I/O misaligned\n");
                goto out_layoutunavailable;