Staging: only build the tree if we really want to

[linux-2.6-omap-h63xx.git] / fs / nfs / nfs2xdr.c

diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c
index 1f7ea675e0c5e9489d8316b60969d159f386d8ab..28bab67d1519bc23b1db1d190713e7971fe79d94 100644 (file)
--- a/fs/nfs/nfs2xdr.c
+++ b/fs/nfs/nfs2xdr.c
@@ -267,7 +267,7 @@ nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
        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++);
@@ -428,11 +428,11 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
        size_t hdrlen;
        unsigned int pglen, recvd;
        u32 len;
-       int status, nr;
+       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) {
@@ -452,7 +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 */
@@ -467,18 +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;
@@ -518,7 +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;
 }
 
@@ -532,7 +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;
 }
@@ -547,7 +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;
@@ -585,7 +604,7 @@ nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
        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) {
@@ -634,7 +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++);
@@ -653,39 +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            }
 };
 
 /*