nfsd4: delay filling in write iovec array till after xdr decoding

Our server rejects compounds containing more than one write operation.
It's unclear whether this is really permitted by the spec; with 4.0,
it's possibly OK, with 4.1 (which has clearer limits on compound
parameters), it's probably not OK.  No client that we're aware of has
ever done this, but in theory it could be useful.

The source of the limitation: we need an array of iovecs to pass to the
write operation.  In the worst case that array of iovecs could have
hundreds of elements (the maximum rwsize divided by the page size), so
it's too big to put on the stack, or in each compound op.  So we instead
keep a single such array in the compound argument.

We fill in that array at the time we decode the xdr operation.

But we decode every op in the compound before executing any of them.  So
once we've used that array we can't decode another write.

If we instead delay filling in that array till the time we actually
perform the write, we can reuse it.

Another option might be to switch to decoding compound ops one at a
time.  I considered doing that, but it has a number of other side
effects, and I'd rather fix just this one problem for now.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 23 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 1d2396b79574..87d24e5f3ca4 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -881,6 +881,24 @@ out:
         return status;
 }
 
+static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
+{
+        int i = 1;
+        int buflen = write->wr_buflen;
+
+        vec[0].iov_base = write->wr_head.iov_base;
+        vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
+        buflen -= vec[0].iov_len;
+
+        while (buflen) {
+                vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
+                vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
+                buflen -= vec[i].iov_len;
+                i++;
+        }
+        return i;
+}
+
 static __be32
 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
             struct nfsd4_write *write)
@@ -889,6 +907,7 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         struct file *filp = NULL;
         __be32 status = nfs_ok;
         unsigned long cnt;
+        int nvecs;
 
         /* no need to check permission - this will be done in nfsd_write() */
 
@@ -911,8 +930,11 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         write->wr_how_written = write->wr_stable_how;
         gen_boot_verifier(&write->wr_verifier);
 
+        nvecs = fill_in_write_vector(rqstp->rq_vec, write);
+        WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
+
         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
-                             write->wr_offset, rqstp->rq_vec, write->wr_vlen,
+                             write->wr_offset, rqstp->rq_vec, nvecs,
                              &cnt, &write->wr_how_written);
         if (filp)
                 fput(filp);