X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fnfs%2Fnfs2xdr.c;h=28bab67d1519bc23b1db1d190713e7971fe79d94;hb=e52c8857e0ca3214aa7e2a746000ac0f3016b345;hp=668ab96c7b596f19c2550c034cbea48f0706ae93;hpb=4f22ccc3460ef65e9899ec271d36fc4ef795c68d;p=linux-2.6

diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index 668ab96c7b..28bab67d15 100644
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -262,10 +262,12 @@ static int
 nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
 {
 	struct kvec *iov = req->rq_rcv_buf.head;
-	int	status, count, recvd, hdrlen;
+	size_t hdrlen;
+	u32 count, recvd;
+	int status;
 
 	if ((status = ntohl(*p++)))
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	p = xdr_decode_fattr(p, res->fattr);
 
 	count = ntohl(*p++);
@@ -273,7 +275,7 @@ nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
 	if (iov->iov_len < hdrlen) {
 		dprintk("NFS: READ reply header overflowed:"
-				"length %d > %Zu\n", hdrlen, iov->iov_len);
+				"length %Zu > %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");
@@ -283,11 +285,11 @@ nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
 	recvd = req->rq_rcv_buf.len - hdrlen;
 	if (count > recvd) {
 		dprintk("NFS: server cheating in read reply: "
-			"count %d > recvd %d\n", count, recvd);
+			"count %u > recvd %u\n", count, recvd);
 		count = recvd;
 	}
 
-	dprintk("RPC:      readres OK count %d\n", count);
+	dprintk("RPC:      readres OK count %u\n", count);
 	if (count < res->count)
 		res->count = count;
 
@@ -423,18 +425,19 @@ 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;
-	int hdrlen, recvd;
-	int status, nr;
-	unsigned int len, pglen;
+	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);
+		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 %d > %Zu\n", hdrlen, iov->iov_len);
+				"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");
@@ -449,7 +452,12 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
 	kaddr = p = kmap_atomic(*page, KM_USER0);
 	end = (__be32 *)((char *)p + pglen);
 	entry = p;
-	for (nr = 0; *p++; nr++) {
+
+	/* 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 */
@@ -464,18 +472,32 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
 			goto short_pkt;
 		entry = p;
 	}
-	if (!nr && (entry[0] != 0 || entry[1] == 0))
-		goto short_pkt;
+
+	/*
+	 * 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;
-	/* truncate listing ? */
-	if (!nr) {
-		dprintk("NFS: readdir reply truncated!\n");
-		entry[1] = 1;
-	}
+	if (!nr)
+		nr = -errno_NFSERR_IO;
 	goto out;
 err_unmap:
 	nr = -errno_NFSERR_IO;
@@ -515,7 +537,7 @@ nfs_xdr_stat(struct rpc_rqst *req, __be32 *p, void *dummy)
 	int	status;
 
 	if ((status = ntohl(*p++)) != 0)
-		status = -nfs_stat_to_errno(status);
+		status = nfs_stat_to_errno(status);
 	return status;
 }
 
@@ -529,7 +551,7 @@ nfs_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
 	int	status;
 
 	if ((status = ntohl(*p++)))
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	xdr_decode_fattr(p, fattr);
 	return 0;
 }
@@ -544,7 +566,7 @@ nfs_xdr_diropres(struct rpc_rqst *req, __be32 *p, struct nfs_diropok *res)
 	int	status;
 
 	if ((status = ntohl(*p++)))
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	p = xdr_decode_fhandle(p, res->fh);
 	xdr_decode_fattr(p, res->fattr);
 	return 0;
@@ -576,22 +598,23 @@ nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
 {
 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
 	struct kvec *iov = rcvbuf->head;
-	int hdrlen, len, recvd;
+	size_t hdrlen;
+	u32 len, recvd;
 	char	*kaddr;
 	int	status;
 
 	if ((status = ntohl(*p++)))
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 	/* Convert length of symlink */
 	len = ntohl(*p++);
-	if (len >= rcvbuf->page_len || len <= 0) {
+	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 %d > %Zu\n", hdrlen, iov->iov_len);
+				"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");
@@ -630,7 +653,7 @@ nfs_xdr_statfsres(struct rpc_rqst *req, __be32 *p, struct nfs2_fsstat *res)
 	int	status;
 
 	if ((status = ntohl(*p++)))
-		return -nfs_stat_to_errno(status);
+		return nfs_stat_to_errno(status);
 
 	res->tsize  = ntohl(*p++);
 	res->bsize  = ntohl(*p++);
@@ -649,39 +672,39 @@ static struct {
 	int errno;
 } nfs_errtbl[] = {
 	{ NFS_OK,		0		},
-	{ NFSERR_PERM,		EPERM		},
-	{ NFSERR_NOENT,		ENOENT		},
-	{ NFSERR_IO,		errno_NFSERR_IO	},
-	{ NFSERR_NXIO,		ENXIO		},
-/*	{ NFSERR_EAGAIN,	EAGAIN		}, */
-	{ NFSERR_ACCES,		EACCES		},
-	{ NFSERR_EXIST,		EEXIST		},
-	{ NFSERR_XDEV,		EXDEV		},
-	{ NFSERR_NODEV,		ENODEV		},
-	{ NFSERR_NOTDIR,	ENOTDIR		},
-	{ NFSERR_ISDIR,		EISDIR		},
-	{ NFSERR_INVAL,		EINVAL		},
-	{ NFSERR_FBIG,		EFBIG		},
-	{ NFSERR_NOSPC,		ENOSPC		},
-	{ NFSERR_ROFS,		EROFS		},
-	{ NFSERR_MLINK,		EMLINK		},
-	{ NFSERR_NAMETOOLONG,	ENAMETOOLONG	},
-	{ NFSERR_NOTEMPTY,	ENOTEMPTY	},
-	{ NFSERR_DQUOT,		EDQUOT		},
-	{ NFSERR_STALE,		ESTALE		},
-	{ NFSERR_REMOTE,	EREMOTE		},
+	{ NFSERR_PERM,		-EPERM		},
+	{ NFSERR_NOENT,		-ENOENT		},
+	{ NFSERR_IO,		-errno_NFSERR_IO},
+	{ NFSERR_NXIO,		-ENXIO		},
+/*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
+	{ NFSERR_ACCES,		-EACCES		},
+	{ NFSERR_EXIST,		-EEXIST		},
+	{ NFSERR_XDEV,		-EXDEV		},
+	{ NFSERR_NODEV,		-ENODEV		},
+	{ NFSERR_NOTDIR,	-ENOTDIR	},
+	{ NFSERR_ISDIR,		-EISDIR		},
+	{ NFSERR_INVAL,		-EINVAL		},
+	{ NFSERR_FBIG,		-EFBIG		},
+	{ NFSERR_NOSPC,		-ENOSPC		},
+	{ NFSERR_ROFS,		-EROFS		},
+	{ NFSERR_MLINK,		-EMLINK		},
+	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
+	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
+	{ NFSERR_DQUOT,		-EDQUOT		},
+	{ NFSERR_STALE,		-ESTALE		},
+	{ NFSERR_REMOTE,	-EREMOTE	},
 #ifdef EWFLUSH
-	{ NFSERR_WFLUSH,	EWFLUSH		},
+	{ NFSERR_WFLUSH,	-EWFLUSH	},
 #endif
-	{ NFSERR_BADHANDLE,	EBADHANDLE	},
-	{ NFSERR_NOT_SYNC,	ENOTSYNC	},
-	{ NFSERR_BAD_COOKIE,	EBADCOOKIE	},
-	{ NFSERR_NOTSUPP,	ENOTSUPP	},
-	{ NFSERR_TOOSMALL,	ETOOSMALL	},
-	{ NFSERR_SERVERFAULT,	ESERVERFAULT	},
-	{ NFSERR_BADTYPE,	EBADTYPE	},
-	{ NFSERR_JUKEBOX,	EJUKEBOX	},
-	{ -1,			EIO		}
+	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
+	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
+	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
+	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
+	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
+	{ NFSERR_SERVERFAULT,	-ESERVERFAULT	},
+	{ NFSERR_BADTYPE,	-EBADTYPE	},
+	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
+	{ -1,			-EIO		}
 };
 
 /*