2005-04-16 22:20:36 +00:00
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/*
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* linux/fs/nfs/nfs2xdr.c
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*
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* XDR functions to encode/decode NFS RPC arguments and results.
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*
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* Copyright (C) 1992, 1993, 1994 Rick Sladkey
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* Copyright (C) 1996 Olaf Kirch
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* 04 Aug 1998 Ion Badulescu <ionut@cs.columbia.edu>
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* FIFO's need special handling in NFSv2
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*/
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#include <linux/param.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/utsname.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/in.h>
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#include <linux/pagemap.h>
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#include <linux/proc_fs.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs2.h>
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#include <linux/nfs_fs.h>
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2006-06-24 12:41:41 +00:00
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#include "internal.h"
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2005-04-16 22:20:36 +00:00
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#define NFSDBG_FACILITY NFSDBG_XDR
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/* Mapping from NFS error code to "errno" error code. */
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#define errno_NFSERR_IO EIO
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/*
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* Declare the space requirements for NFS arguments and replies as
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* number of 32bit-words
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*/
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#define NFS_fhandle_sz (8)
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#define NFS_sattr_sz (8)
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#define NFS_filename_sz (1+(NFS2_MAXNAMLEN>>2))
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#define NFS_path_sz (1+(NFS2_MAXPATHLEN>>2))
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#define NFS_fattr_sz (17)
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#define NFS_info_sz (5)
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#define NFS_entry_sz (NFS_filename_sz+3)
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#define NFS_diropargs_sz (NFS_fhandle_sz+NFS_filename_sz)
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2007-07-14 19:39:57 +00:00
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#define NFS_removeargs_sz (NFS_fhandle_sz+NFS_filename_sz)
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2005-04-16 22:20:36 +00:00
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#define NFS_sattrargs_sz (NFS_fhandle_sz+NFS_sattr_sz)
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#define NFS_readlinkargs_sz (NFS_fhandle_sz)
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#define NFS_readargs_sz (NFS_fhandle_sz+3)
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#define NFS_writeargs_sz (NFS_fhandle_sz+4)
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#define NFS_createargs_sz (NFS_diropargs_sz+NFS_sattr_sz)
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#define NFS_renameargs_sz (NFS_diropargs_sz+NFS_diropargs_sz)
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#define NFS_linkargs_sz (NFS_fhandle_sz+NFS_diropargs_sz)
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2006-08-23 00:06:23 +00:00
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#define NFS_symlinkargs_sz (NFS_diropargs_sz+1+NFS_sattr_sz)
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2005-04-16 22:20:36 +00:00
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#define NFS_readdirargs_sz (NFS_fhandle_sz+2)
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#define NFS_attrstat_sz (1+NFS_fattr_sz)
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#define NFS_diropres_sz (1+NFS_fhandle_sz+NFS_fattr_sz)
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#define NFS_readlinkres_sz (2)
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#define NFS_readres_sz (1+NFS_fattr_sz+1)
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#define NFS_writeres_sz (NFS_attrstat_sz)
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#define NFS_stat_sz (1)
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#define NFS_readdirres_sz (1)
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#define NFS_statfsres_sz (1+NFS_info_sz)
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/*
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* Common NFS XDR functions as inlines
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*/
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2006-10-20 06:28:47 +00:00
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static inline __be32 *
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2007-07-14 19:39:57 +00:00
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xdr_encode_fhandle(__be32 *p, const struct nfs_fh *fhandle)
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2005-04-16 22:20:36 +00:00
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{
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memcpy(p, fhandle->data, NFS2_FHSIZE);
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return p + XDR_QUADLEN(NFS2_FHSIZE);
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}
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2006-10-20 06:28:47 +00:00
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static inline __be32 *
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xdr_decode_fhandle(__be32 *p, struct nfs_fh *fhandle)
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2005-04-16 22:20:36 +00:00
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{
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/* NFSv2 handles have a fixed length */
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fhandle->size = NFS2_FHSIZE;
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memcpy(fhandle->data, p, NFS2_FHSIZE);
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return p + XDR_QUADLEN(NFS2_FHSIZE);
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}
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2006-10-20 06:28:47 +00:00
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static inline __be32*
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xdr_encode_time(__be32 *p, struct timespec *timep)
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2005-04-16 22:20:36 +00:00
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{
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*p++ = htonl(timep->tv_sec);
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/* Convert nanoseconds into microseconds */
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*p++ = htonl(timep->tv_nsec ? timep->tv_nsec / 1000 : 0);
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return p;
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}
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2006-10-20 06:28:47 +00:00
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static inline __be32*
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xdr_encode_current_server_time(__be32 *p, struct timespec *timep)
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2005-04-16 22:20:36 +00:00
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{
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/*
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* Passing the invalid value useconds=1000000 is a
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* Sun convention for "set to current server time".
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* It's needed to make permissions checks for the
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* "touch" program across v2 mounts to Solaris and
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* Irix boxes work correctly. See description of
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* sattr in section 6.1 of "NFS Illustrated" by
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* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
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*/
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*p++ = htonl(timep->tv_sec);
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*p++ = htonl(1000000);
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return p;
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}
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2006-10-20 06:28:47 +00:00
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static inline __be32*
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xdr_decode_time(__be32 *p, struct timespec *timep)
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2005-04-16 22:20:36 +00:00
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{
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timep->tv_sec = ntohl(*p++);
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/* Convert microseconds into nanoseconds */
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timep->tv_nsec = ntohl(*p++) * 1000;
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return p;
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}
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2006-10-20 06:28:47 +00:00
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static __be32 *
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xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
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2005-04-16 22:20:36 +00:00
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{
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u32 rdev;
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fattr->type = (enum nfs_ftype) ntohl(*p++);
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fattr->mode = ntohl(*p++);
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fattr->nlink = ntohl(*p++);
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fattr->uid = ntohl(*p++);
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fattr->gid = ntohl(*p++);
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fattr->size = ntohl(*p++);
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fattr->du.nfs2.blocksize = ntohl(*p++);
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rdev = ntohl(*p++);
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fattr->du.nfs2.blocks = ntohl(*p++);
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2006-06-09 13:34:19 +00:00
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fattr->fsid.major = ntohl(*p++);
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fattr->fsid.minor = 0;
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2005-04-16 22:20:36 +00:00
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fattr->fileid = ntohl(*p++);
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p = xdr_decode_time(p, &fattr->atime);
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p = xdr_decode_time(p, &fattr->mtime);
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p = xdr_decode_time(p, &fattr->ctime);
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2009-03-11 18:10:24 +00:00
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fattr->valid |= NFS_ATTR_FATTR_V2;
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2005-04-16 22:20:36 +00:00
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fattr->rdev = new_decode_dev(rdev);
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if (fattr->type == NFCHR && rdev == NFS2_FIFO_DEV) {
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fattr->type = NFFIFO;
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fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
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fattr->rdev = 0;
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}
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return p;
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}
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2006-10-20 06:28:47 +00:00
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static inline __be32 *
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xdr_encode_sattr(__be32 *p, struct iattr *attr)
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2005-04-16 22:20:36 +00:00
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{
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2006-10-20 06:28:47 +00:00
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const __be32 not_set = __constant_htonl(0xFFFFFFFF);
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2006-01-03 08:55:54 +00:00
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*p++ = (attr->ia_valid & ATTR_MODE) ? htonl(attr->ia_mode) : not_set;
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*p++ = (attr->ia_valid & ATTR_UID) ? htonl(attr->ia_uid) : not_set;
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*p++ = (attr->ia_valid & ATTR_GID) ? htonl(attr->ia_gid) : not_set;
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*p++ = (attr->ia_valid & ATTR_SIZE) ? htonl(attr->ia_size) : not_set;
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2005-04-16 22:20:36 +00:00
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if (attr->ia_valid & ATTR_ATIME_SET) {
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p = xdr_encode_time(p, &attr->ia_atime);
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} else if (attr->ia_valid & ATTR_ATIME) {
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p = xdr_encode_current_server_time(p, &attr->ia_atime);
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} else {
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2006-01-03 08:55:54 +00:00
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*p++ = not_set;
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*p++ = not_set;
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2005-04-16 22:20:36 +00:00
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}
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if (attr->ia_valid & ATTR_MTIME_SET) {
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p = xdr_encode_time(p, &attr->ia_mtime);
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} else if (attr->ia_valid & ATTR_MTIME) {
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p = xdr_encode_current_server_time(p, &attr->ia_mtime);
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} else {
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2006-01-03 08:55:54 +00:00
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*p++ = not_set;
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*p++ = not_set;
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2005-04-16 22:20:36 +00:00
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}
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return p;
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}
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/*
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* NFS encode functions
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*/
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/*
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* Encode file handle argument
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* GETATTR, READLINK, STATFS
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*/
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static int
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2006-10-20 06:28:47 +00:00
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nfs_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
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2005-04-16 22:20:36 +00:00
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{
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p = xdr_encode_fhandle(p, fh);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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/*
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* Encode SETATTR arguments
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*/
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static int
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2006-10-20 06:28:47 +00:00
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nfs_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs_sattrargs *args)
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2005-04-16 22:20:36 +00:00
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{
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p = xdr_encode_fhandle(p, args->fh);
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p = xdr_encode_sattr(p, args->sattr);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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/*
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* Encode directory ops argument
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2007-07-14 19:39:57 +00:00
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* LOOKUP, RMDIR
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2005-04-16 22:20:36 +00:00
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*/
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static int
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2006-10-20 06:28:47 +00:00
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nfs_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs_diropargs *args)
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2005-04-16 22:20:36 +00:00
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{
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p = xdr_encode_fhandle(p, args->fh);
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p = xdr_encode_array(p, args->name, args->len);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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2007-07-14 19:39:57 +00:00
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/*
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* Encode REMOVE argument
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*/
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static int
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nfs_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
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{
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p = xdr_encode_fhandle(p, args->fh);
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p = xdr_encode_array(p, args->name.name, args->name.len);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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2005-04-16 22:20:36 +00:00
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/*
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* Arguments to a READ call. Since we read data directly into the page
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* cache, we also set up the reply iovec here so that iov[1] points
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* exactly to the page we want to fetch.
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*/
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static int
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2006-10-20 06:28:47 +00:00
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nfs_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
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2005-04-16 22:20:36 +00:00
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{
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2007-06-27 18:29:04 +00:00
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struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
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2005-04-16 22:20:36 +00:00
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unsigned int replen;
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u32 offset = (u32)args->offset;
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u32 count = args->count;
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p = xdr_encode_fhandle(p, args->fh);
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*p++ = htonl(offset);
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*p++ = htonl(count);
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*p++ = htonl(count);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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/* Inline the page array */
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replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readres_sz) << 2;
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xdr_inline_pages(&req->rq_rcv_buf, replen,
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args->pages, args->pgbase, count);
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2007-09-10 17:44:58 +00:00
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req->rq_rcv_buf.flags |= XDRBUF_READ;
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2005-04-16 22:20:36 +00:00
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return 0;
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}
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/*
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* Decode READ reply
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*/
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static int
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2006-10-20 06:28:47 +00:00
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nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
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2005-04-16 22:20:36 +00:00
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{
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struct kvec *iov = req->rq_rcv_buf.head;
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2007-10-26 17:31:52 +00:00
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size_t hdrlen;
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u32 count, recvd;
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int status;
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2005-04-16 22:20:36 +00:00
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if ((status = ntohl(*p++)))
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2008-03-31 14:39:06 +00:00
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return nfs_stat_to_errno(status);
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2005-04-16 22:20:36 +00:00
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p = xdr_decode_fattr(p, res->fattr);
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count = ntohl(*p++);
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res->eof = 0;
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hdrlen = (u8 *) p - (u8 *) iov->iov_base;
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if (iov->iov_len < hdrlen) {
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2007-09-11 22:01:10 +00:00
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dprintk("NFS: READ reply header overflowed:"
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2007-10-26 17:31:52 +00:00
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"length %Zu > %Zu\n", hdrlen, iov->iov_len);
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2005-04-16 22:20:36 +00:00
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return -errno_NFSERR_IO;
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} else if (iov->iov_len != hdrlen) {
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dprintk("NFS: READ header is short. iovec will be shifted.\n");
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xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
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}
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recvd = req->rq_rcv_buf.len - hdrlen;
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if (count > recvd) {
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2007-09-11 22:01:10 +00:00
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dprintk("NFS: server cheating in read reply: "
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2007-10-26 17:31:52 +00:00
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"count %u > recvd %u\n", count, recvd);
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2005-04-16 22:20:36 +00:00
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count = recvd;
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}
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2007-10-26 17:31:52 +00:00
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dprintk("RPC: readres OK count %u\n", count);
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2005-04-16 22:20:36 +00:00
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|
|
if (count < res->count)
|
|
|
|
res->count = count;
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Write arguments. Splice the buffer to be written into the iovec.
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct xdr_buf *sndbuf = &req->rq_snd_buf;
|
|
|
|
u32 offset = (u32)args->offset;
|
|
|
|
u32 count = args->count;
|
|
|
|
|
|
|
|
p = xdr_encode_fhandle(p, args->fh);
|
|
|
|
*p++ = htonl(offset);
|
|
|
|
*p++ = htonl(offset);
|
|
|
|
*p++ = htonl(count);
|
|
|
|
*p++ = htonl(count);
|
|
|
|
sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
|
|
|
|
|
|
|
|
/* Copy the page array */
|
|
|
|
xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
|
2007-09-10 17:44:58 +00:00
|
|
|
sndbuf->flags |= XDRBUF_WRITE;
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode create arguments
|
|
|
|
* CREATE, MKDIR
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs_createargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
p = xdr_encode_fhandle(p, args->fh);
|
|
|
|
p = xdr_encode_array(p, args->name, args->len);
|
|
|
|
p = xdr_encode_sattr(p, args->sattr);
|
|
|
|
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode RENAME arguments
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs_renameargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
p = xdr_encode_fhandle(p, args->fromfh);
|
|
|
|
p = xdr_encode_array(p, args->fromname, args->fromlen);
|
|
|
|
p = xdr_encode_fhandle(p, args->tofh);
|
|
|
|
p = xdr_encode_array(p, args->toname, args->tolen);
|
|
|
|
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode LINK arguments
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs_linkargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
p = xdr_encode_fhandle(p, args->fromfh);
|
|
|
|
p = xdr_encode_fhandle(p, args->tofh);
|
|
|
|
p = xdr_encode_array(p, args->toname, args->tolen);
|
|
|
|
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode SYMLINK arguments
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_symlinkargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-08-23 00:06:23 +00:00
|
|
|
struct xdr_buf *sndbuf = &req->rq_snd_buf;
|
|
|
|
size_t pad;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
p = xdr_encode_fhandle(p, args->fromfh);
|
|
|
|
p = xdr_encode_array(p, args->fromname, args->fromlen);
|
2006-08-23 00:06:23 +00:00
|
|
|
*p++ = htonl(args->pathlen);
|
|
|
|
sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
|
|
|
|
|
|
|
|
xdr_encode_pages(sndbuf, args->pages, 0, args->pathlen);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* xdr_encode_pages may have added a few bytes to ensure the
|
|
|
|
* pathname ends on a 4-byte boundary. Start encoding the
|
|
|
|
* attributes after the pad bytes.
|
|
|
|
*/
|
|
|
|
pad = sndbuf->tail->iov_len;
|
|
|
|
if (pad > 0)
|
|
|
|
p++;
|
2005-04-16 22:20:36 +00:00
|
|
|
p = xdr_encode_sattr(p, args->sattr);
|
2006-08-23 00:06:23 +00:00
|
|
|
sndbuf->len += xdr_adjust_iovec(sndbuf->tail, p) - pad;
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode arguments to readdir call
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs_readdirargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct rpc_task *task = req->rq_task;
|
2007-06-27 18:29:04 +00:00
|
|
|
struct rpc_auth *auth = task->tk_msg.rpc_cred->cr_auth;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int replen;
|
|
|
|
u32 count = args->count;
|
|
|
|
|
|
|
|
p = xdr_encode_fhandle(p, args->fh);
|
|
|
|
*p++ = htonl(args->cookie);
|
|
|
|
*p++ = htonl(count); /* see above */
|
|
|
|
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
|
|
|
|
|
|
|
|
/* Inline the page array */
|
|
|
|
replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readdirres_sz) << 2;
|
|
|
|
xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
|
|
|
|
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
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
|
|
|
|
struct kvec *iov = rcvbuf->head;
|
|
|
|
struct page **page;
|
2007-10-26 17:31:52 +00:00
|
|
|
size_t hdrlen;
|
|
|
|
unsigned int pglen, recvd;
|
|
|
|
u32 len;
|
2008-02-22 19:49:59 +00:00
|
|
|
int status, nr = 0;
|
2006-10-20 06:28:47 +00:00
|
|
|
__be32 *end, *entry, *kaddr;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if ((status = ntohl(*p++)))
|
2008-03-31 14:39:06 +00:00
|
|
|
return nfs_stat_to_errno(status);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
|
|
|
|
if (iov->iov_len < hdrlen) {
|
2007-09-11 22:01:10 +00:00
|
|
|
dprintk("NFS: READDIR reply header overflowed:"
|
2007-10-26 17:31:52 +00:00
|
|
|
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
|
2005-04-16 22:20:36 +00:00
|
|
|
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;
|
2006-10-20 06:28:47 +00:00
|
|
|
kaddr = p = kmap_atomic(*page, KM_USER0);
|
|
|
|
end = (__be32 *)((char *)p + pglen);
|
2005-04-16 22:20:36 +00:00
|
|
|
entry = p;
|
2008-02-22 19:49:59 +00:00
|
|
|
|
|
|
|
/* Make sure the packet actually has a value_follows and EOF entry */
|
|
|
|
if ((entry + 1) > end)
|
|
|
|
goto short_pkt;
|
|
|
|
|
|
|
|
for (; *p++; nr++) {
|
2005-04-16 22:20:36 +00:00
|
|
|
if (p + 2 > end)
|
|
|
|
goto short_pkt;
|
|
|
|
p++; /* fileid */
|
|
|
|
len = ntohl(*p++);
|
|
|
|
p += XDR_QUADLEN(len) + 1; /* name plus cookie */
|
|
|
|
if (len > NFS2_MAXNAMLEN) {
|
2007-09-11 22:01:10 +00:00
|
|
|
dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
|
2005-04-16 22:20:36 +00:00
|
|
|
len);
|
|
|
|
goto err_unmap;
|
|
|
|
}
|
|
|
|
if (p + 2 > end)
|
|
|
|
goto short_pkt;
|
|
|
|
entry = p;
|
|
|
|
}
|
2008-02-22 19:49:59 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
out:
|
|
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
|
|
return nr;
|
|
|
|
short_pkt:
|
2008-02-22 19:49:59 +00:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
2005-04-16 22:20:36 +00:00
|
|
|
entry[0] = entry[1] = 0;
|
2008-02-22 19:49:59 +00:00
|
|
|
if (!nr)
|
|
|
|
nr = -errno_NFSERR_IO;
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out;
|
|
|
|
err_unmap:
|
|
|
|
nr = -errno_NFSERR_IO;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2006-10-20 06:28:49 +00:00
|
|
|
__be32 *
|
|
|
|
nfs_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
if (!*p++) {
|
|
|
|
if (!*p)
|
|
|
|
return ERR_PTR(-EAGAIN);
|
|
|
|
entry->eof = 1;
|
|
|
|
return ERR_PTR(-EBADCOOKIE);
|
|
|
|
}
|
|
|
|
|
|
|
|
entry->ino = ntohl(*p++);
|
|
|
|
entry->len = ntohl(*p++);
|
|
|
|
entry->name = (const char *) p;
|
|
|
|
p += XDR_QUADLEN(entry->len);
|
|
|
|
entry->prev_cookie = entry->cookie;
|
|
|
|
entry->cookie = ntohl(*p++);
|
|
|
|
entry->eof = !p[0] && p[1];
|
|
|
|
|
|
|
|
return p;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* NFS XDR decode functions
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
* Decode simple status reply
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_stat(struct rpc_rqst *req, __be32 *p, void *dummy)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
if ((status = ntohl(*p++)) != 0)
|
2008-03-31 14:39:06 +00:00
|
|
|
status = nfs_stat_to_errno(status);
|
2005-04-16 22:20:36 +00:00
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Decode attrstat reply
|
|
|
|
* GETATTR, SETATTR, WRITE
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
if ((status = ntohl(*p++)))
|
2008-03-31 14:39:06 +00:00
|
|
|
return nfs_stat_to_errno(status);
|
2005-04-16 22:20:36 +00:00
|
|
|
xdr_decode_fattr(p, fattr);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Decode diropres reply
|
|
|
|
* LOOKUP, CREATE, MKDIR
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_diropres(struct rpc_rqst *req, __be32 *p, struct nfs_diropok *res)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
if ((status = ntohl(*p++)))
|
2008-03-31 14:39:06 +00:00
|
|
|
return nfs_stat_to_errno(status);
|
2005-04-16 22:20:36 +00:00
|
|
|
p = xdr_decode_fhandle(p, res->fh);
|
|
|
|
xdr_decode_fattr(p, res->fattr);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode READLINK args
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_readlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_readlinkargs *args)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-06-27 18:29:04 +00:00
|
|
|
struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned int replen;
|
|
|
|
|
|
|
|
p = xdr_encode_fhandle(p, args->fh);
|
|
|
|
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
|
|
|
|
|
|
|
|
/* Inline the page array */
|
|
|
|
replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readlinkres_sz) << 2;
|
|
|
|
xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Decode READLINK reply
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
|
|
|
|
struct kvec *iov = rcvbuf->head;
|
2007-10-26 17:31:52 +00:00
|
|
|
size_t hdrlen;
|
|
|
|
u32 len, recvd;
|
2005-04-16 22:20:36 +00:00
|
|
|
char *kaddr;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
if ((status = ntohl(*p++)))
|
2008-03-31 14:39:06 +00:00
|
|
|
return nfs_stat_to_errno(status);
|
2005-04-16 22:20:36 +00:00
|
|
|
/* Convert length of symlink */
|
|
|
|
len = ntohl(*p++);
|
2007-10-26 17:31:52 +00:00
|
|
|
if (len >= rcvbuf->page_len) {
|
2007-09-11 22:01:10 +00:00
|
|
|
dprintk("nfs: server returned giant symlink!\n");
|
2005-04-16 22:20:36 +00:00
|
|
|
return -ENAMETOOLONG;
|
|
|
|
}
|
|
|
|
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
|
|
|
|
if (iov->iov_len < hdrlen) {
|
2007-09-11 22:01:10 +00:00
|
|
|
dprintk("NFS: READLINK reply header overflowed:"
|
2007-10-26 17:31:52 +00:00
|
|
|
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
|
2005-04-16 22:20:36 +00:00
|
|
|
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) {
|
2007-09-11 22:01:10 +00:00
|
|
|
dprintk("NFS: server cheating in readlink reply: "
|
2005-04-16 22:20:36 +00:00
|
|
|
"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 WRITE reply
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
res->verf->committed = NFS_FILE_SYNC;
|
|
|
|
return nfs_xdr_attrstat(req, p, res->fattr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Decode STATFS reply
|
|
|
|
*/
|
|
|
|
static int
|
2006-10-20 06:28:47 +00:00
|
|
|
nfs_xdr_statfsres(struct rpc_rqst *req, __be32 *p, struct nfs2_fsstat *res)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
if ((status = ntohl(*p++)))
|
2008-03-31 14:39:06 +00:00
|
|
|
return nfs_stat_to_errno(status);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
res->tsize = ntohl(*p++);
|
|
|
|
res->bsize = ntohl(*p++);
|
|
|
|
res->blocks = ntohl(*p++);
|
|
|
|
res->bfree = ntohl(*p++);
|
|
|
|
res->bavail = ntohl(*p++);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We need to translate between nfs status return values and
|
|
|
|
* the local errno values which may not be the same.
|
|
|
|
*/
|
|
|
|
static struct {
|
|
|
|
int stat;
|
|
|
|
int errno;
|
|
|
|
} nfs_errtbl[] = {
|
|
|
|
{ NFS_OK, 0 },
|
2008-03-31 14:39:06 +00:00
|
|
|
{ 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 },
|
2005-04-16 22:20:36 +00:00
|
|
|
#ifdef EWFLUSH
|
2008-03-31 14:39:06 +00:00
|
|
|
{ NFSERR_WFLUSH, -EWFLUSH },
|
2005-04-16 22:20:36 +00:00
|
|
|
#endif
|
2008-03-31 14:39:06 +00:00
|
|
|
{ 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 }
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Convert an NFS error code to a local one.
|
|
|
|
* This one is used jointly by NFSv2 and NFSv3.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
nfs_stat_to_errno(int stat)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; nfs_errtbl[i].stat != -1; i++) {
|
|
|
|
if (nfs_errtbl[i].stat == stat)
|
|
|
|
return nfs_errtbl[i].errno;
|
|
|
|
}
|
2007-09-11 22:01:10 +00:00
|
|
|
dprintk("nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
|
2005-04-16 22:20:36 +00:00
|
|
|
return nfs_errtbl[i].errno;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define PROC(proc, argtype, restype, timer) \
|
|
|
|
[NFSPROC_##proc] = { \
|
|
|
|
.p_proc = NFSPROC_##proc, \
|
|
|
|
.p_encode = (kxdrproc_t) nfs_xdr_##argtype, \
|
|
|
|
.p_decode = (kxdrproc_t) nfs_xdr_##restype, \
|
2007-03-29 20:47:53 +00:00
|
|
|
.p_arglen = NFS_##argtype##_sz, \
|
|
|
|
.p_replen = NFS_##restype##_sz, \
|
2006-03-20 18:44:22 +00:00
|
|
|
.p_timer = timer, \
|
|
|
|
.p_statidx = NFSPROC_##proc, \
|
|
|
|
.p_name = #proc, \
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
struct rpc_procinfo nfs_procedures[] = {
|
|
|
|
PROC(GETATTR, fhandle, attrstat, 1),
|
|
|
|
PROC(SETATTR, sattrargs, attrstat, 0),
|
|
|
|
PROC(LOOKUP, diropargs, diropres, 2),
|
|
|
|
PROC(READLINK, readlinkargs, readlinkres, 3),
|
|
|
|
PROC(READ, readargs, readres, 3),
|
|
|
|
PROC(WRITE, writeargs, writeres, 4),
|
|
|
|
PROC(CREATE, createargs, diropres, 0),
|
2007-07-14 19:39:57 +00:00
|
|
|
PROC(REMOVE, removeargs, stat, 0),
|
2005-04-16 22:20:36 +00:00
|
|
|
PROC(RENAME, renameargs, stat, 0),
|
|
|
|
PROC(LINK, linkargs, stat, 0),
|
|
|
|
PROC(SYMLINK, symlinkargs, stat, 0),
|
|
|
|
PROC(MKDIR, createargs, diropres, 0),
|
|
|
|
PROC(RMDIR, diropargs, stat, 0),
|
|
|
|
PROC(READDIR, readdirargs, readdirres, 3),
|
|
|
|
PROC(STATFS, fhandle, statfsres, 0),
|
|
|
|
};
|
|
|
|
|
|
|
|
struct rpc_version nfs_version2 = {
|
|
|
|
.number = 2,
|
2006-03-24 11:15:34 +00:00
|
|
|
.nrprocs = ARRAY_SIZE(nfs_procedures),
|
2005-04-16 22:20:36 +00:00
|
|
|
.procs = nfs_procedures
|
|
|
|
};
|