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NFS: remove page size checking code

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Remove the page size checking code for a readdir decode.  This is now done
by decode_dirent with xdr_streams.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker
2010-10-20 15:44:31 -04:00
committed by Trond Myklebust
parent babddc72a9
commit afa8ccc978
3 changed files with 1 additions and 197 deletions
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66
fs/nfs/nfs4xdr.c
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@@ -4200,12 +4200,9 @@ out_overflow:
static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct page *page = *rcvbuf->pages;
struct kvec *iov = rcvbuf->head;
size_t hdrlen;
u32 recvd, pglen = rcvbuf->page_len;
__be32 *end, *entry, *p, *kaddr;
unsigned int nr = 0;
int status;
status = decode_op_hdr(xdr, OP_READDIR);
@@ -4225,71 +4222,8 @@ static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct n
pglen = recvd;
xdr_read_pages(xdr, pglen);
BUG_ON(pglen + readdir->pgbase > PAGE_CACHE_SIZE);
kaddr = p = kmap_atomic(page, KM_USER0);
end = p + ((pglen + readdir->pgbase) >> 2);
entry = p;
/* Make sure the packet actually has a value_follows and EOF entry */
if ((entry + 1) > end)
goto short_pkt;
for (; *p++; nr++) {
u32 len, attrlen, xlen;
if (end - p < 3)
goto short_pkt;
dprintk("cookie = %Lu, ", *((unsigned long long *)p));
p += 2; /* cookie */
len = ntohl(*p++); /* filename length */
if (len > NFS4_MAXNAMLEN) {
dprintk("NFS: giant filename in readdir (len 0x%x)\n",
len);
goto err_unmap;
}
xlen = XDR_QUADLEN(len);
if (end - p < xlen + 1)
goto short_pkt;
dprintk("filename = %*s\n", len, (char *)p);
p += xlen;
len = ntohl(*p++); /* bitmap length */
if (end - p < len + 1)
goto short_pkt;
p += len;
attrlen = XDR_QUADLEN(ntohl(*p++));
if (end - p < attrlen + 2)
goto short_pkt;
p += attrlen; /* attributes */
entry = p;
}
/*
* Apparently some server sends responses that are a valid size, but
* contain no entries, and have value_follows==0 and EOF==0. For
* those, just set the EOF marker.
*/
if (!nr && entry[1] == 0) {
dprintk("NFS: readdir reply truncated!\n");
entry[1] = 1;
}
out:
kunmap_atomic(kaddr, KM_USER0);
return 0;
short_pkt:
/*
* When we get a short packet there are 2 possibilities. We can
* return an error, or fix up the response to look like a valid
* response and return what we have so far. If there are no
* entries and the packet was short, then return -EIO. If there
* are valid entries in the response, return them and pretend that
* the call was successful, but incomplete. The caller can retry the
* readdir starting at the last cookie.
*/
dprintk("%s: short packet at entry %d\n", __func__, nr);
entry[0] = entry[1] = 0;
if (nr)
goto out;
err_unmap:
kunmap_atomic(kaddr, KM_USER0);
return -errno_NFSERR_IO;
}
static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)