/*
* Decode READ reply
*/
static int
nfs_xdr_readres(struct rpc_rqst *req, u32 *p, struct nfs_readres *res)
{
struct kvec *iov = req->rq_rcv_buf.head;
int status, count, recvd, hdrlen;
if ((status = ntohl(*p++)))
return -nfs_stat_to_errno(status);
p = xdr_decode_fattr(p, res->fattr);
count = ntohl(*p++);
res->eof = 0;
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
printk(KERN_WARNING "NFS: READ reply header overflowed:"
"length %d > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READ header is short. iovec will be shifted.\n");
xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
}
recvd = req->rq_rcv_buf.len - hdrlen;
if (count > recvd) {
printk(KERN_WARNING "NFS: server cheating in read reply: "
"count %d > recvd %d\n", count, recvd);
count = recvd;
}
dprintk("RPC: readres OK count %d\n", count);
if (count < res->count)
res->count = count;
return count;
}
/*
* Decode READLINK reply
*/
static int
nfs_xdr_readlinkres(struct rpc_rqst *req, u32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct iovec *iov = rcvbuf->head;
unsigned int hdrlen;
u32 *strlen, len;
char *string;
int status;
if ((status = ntohl(*p++)))
return -nfs_stat_to_errno(status);
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len > hdrlen) {
dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
strlen = (u32*)kmap_atomic(rcvbuf->pages[0], KM_USER0);
/* Convert length of symlink */
len = ntohl(*strlen);
if (len >= rcvbuf->page_len - sizeof(u32) || len > NFS2_MAXPATHLEN) {
dprintk("NFS: READLINK server returned giant symlink!\n");
kunmap_atomic(strlen, KM_USER0);
return -ENAMETOOLONG;
}
*strlen = len;
/* NULL terminate the string we got */
string = (char *)(strlen + 1);
string[len] = 0;
kunmap_atomic(strlen, KM_USER0);
return 0;
}
/*
* Decode the result of a readdir call.
* We're not really decoding anymore, we just leave the buffer untouched
* and only check that it is syntactically correct.
* The real decoding happens in nfs_decode_entry below, called directly
* from nfs_readdir for each entry.
*/
static int
nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
struct page **page;
size_t hdrlen;
unsigned int pglen, recvd;
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READDIR reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
pglen = rcvbuf->page_len;
recvd = rcvbuf->len - hdrlen;
if (pglen > recvd)
pglen = recvd;
page = rcvbuf->pages;
return pglen;
}
static int
nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
size_t hdrlen;
u32 len, recvd;
char *kaddr;
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
/* Convert length of symlink */
len = ntohl(*p++);
if (len >= rcvbuf->page_len) {
dprintk("nfs: server returned giant symlink!\n");
return -ENAMETOOLONG;
}
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READLINK reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
recvd = req->rq_rcv_buf.len - hdrlen;
if (recvd < len) {
dprintk("NFS: server cheating in readlink reply: "
"count %u > recvd %u\n", len, recvd);
return -EIO;
}
/* NULL terminate the string we got */
kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
kaddr[len+rcvbuf->page_base] = '\0';
kunmap_atomic(kaddr, KM_USER0);
return 0;
}
/*
* Decode the result of a readdir call.
* We're not really decoding anymore, we just leave the buffer untouched
* and only check that it is syntactically correct.
* The real decoding happens in nfs_decode_entry below, called directly
* from nfs_readdir for each entry.
*/
static int
nfs_xdr_readdirres(struct rpc_rqst *req, u32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
struct page **page;
int hdrlen, recvd;
int status, nr;
unsigned int len, pglen;
u32 *end, *entry, *kaddr;
if ((status = ntohl(*p++)))
return -nfs_stat_to_errno(status);
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
printk(KERN_WARNING "NFS: READDIR reply header overflowed:"
"length %d > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
pglen = rcvbuf->page_len;
recvd = rcvbuf->len - hdrlen;
if (pglen > recvd)
pglen = recvd;
page = rcvbuf->pages;
kaddr = p = (u32 *)kmap_atomic(*page, KM_USER0);
end = (u32 *)((char *)p + pglen);
entry = p;
for (nr = 0; *p++; nr++) {
if (p + 2 > end)
goto short_pkt;
p++; /* fileid */
len = ntohl(*p++);
p += XDR_QUADLEN(len) + 1; /* name plus cookie */
if (len > NFS2_MAXNAMLEN) {
printk(KERN_WARNING "NFS: giant filename in readdir (len 0x%x)!\n",
len);
goto err_unmap;
}
if (p + 2 > end)
goto short_pkt;
entry = p;
}
if (!nr && (entry[0] != 0 || entry[1] == 0))
goto short_pkt;
out:
kunmap_atomic(kaddr, KM_USER0);
return nr;
short_pkt:
entry[0] = entry[1] = 0;
/* truncate listing ? */
if (!nr) {
printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
entry[1] = 1;
}
goto out;
err_unmap:
nr = -errno_NFSERR_IO;
goto out;
}
static int
nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
struct page **page;
size_t hdrlen;
unsigned int pglen, recvd;
u32 len;
int status, nr = 0;
__be32 *end, *entry, *kaddr;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READDIR reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
pglen = rcvbuf->page_len;
recvd = rcvbuf->len - hdrlen;
if (pglen > recvd)
pglen = recvd;
page = rcvbuf->pages;
kaddr = p = kmap_atomic(*page, KM_USER0);
end = (__be32 *)((char *)p + pglen);
entry = p;
/* Make sure the packet actually has a value_follows and EOF entry */
if ((entry + 1) > end)
goto short_pkt;
for (; *p++; nr++) {
if (p + 2 > end)
goto short_pkt;
p++; /* fileid */
len = ntohl(*p++);
p += XDR_QUADLEN(len) + 1; /* name plus cookie */
if (len > NFS2_MAXNAMLEN) {
dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
len);
goto err_unmap;
}
if (p + 2 > end)
goto short_pkt;
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 nr;
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.
*/
entry[0] = entry[1] = 0;
if (!nr)
nr = -errno_NFSERR_IO;
goto out;
err_unmap:
nr = -errno_NFSERR_IO;
goto out;
}
