512 lines
12 KiB
C
512 lines
12 KiB
C
/*
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* linux/fs/nfsd/xdr.c
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*
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* XDR support for nfsd
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/time.h>
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#include <linux/nfs.h>
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#include <linux/vfs.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfsd/xdr.h>
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#include <linux/mm.h>
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#define NFSDDBG_FACILITY NFSDDBG_XDR
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#ifdef NFSD_OPTIMIZE_SPACE
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# define inline
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#endif
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/*
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* Mapping of S_IF* types to NFS file types
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*/
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static u32 nfs_ftypes[] = {
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NFNON, NFCHR, NFCHR, NFBAD,
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NFDIR, NFBAD, NFBLK, NFBAD,
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NFREG, NFBAD, NFLNK, NFBAD,
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NFSOCK, NFBAD, NFLNK, NFBAD,
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};
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/*
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* XDR functions for basic NFS types
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*/
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static inline u32 *
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decode_fh(u32 *p, struct svc_fh *fhp)
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{
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fh_init(fhp, NFS_FHSIZE);
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memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
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fhp->fh_handle.fh_size = NFS_FHSIZE;
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/* FIXME: Look up export pointer here and verify
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* Sun Secure RPC if requested */
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return p + (NFS_FHSIZE >> 2);
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}
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static inline u32 *
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encode_fh(u32 *p, struct svc_fh *fhp)
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{
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memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
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return p + (NFS_FHSIZE>> 2);
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}
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/*
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* Decode a file name and make sure that the path contains
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* no slashes or null bytes.
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*/
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static inline u32 *
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decode_filename(u32 *p, char **namp, int *lenp)
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{
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char *name;
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int i;
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if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
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for (i = 0, name = *namp; i < *lenp; i++, name++) {
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if (*name == '\0' || *name == '/')
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return NULL;
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}
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}
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return p;
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}
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static inline u32 *
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decode_pathname(u32 *p, char **namp, int *lenp)
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{
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char *name;
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int i;
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if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
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for (i = 0, name = *namp; i < *lenp; i++, name++) {
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if (*name == '\0')
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return NULL;
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}
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}
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return p;
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}
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static inline u32 *
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decode_sattr(u32 *p, struct iattr *iap)
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{
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u32 tmp, tmp1;
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iap->ia_valid = 0;
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/* Sun client bug compatibility check: some sun clients seem to
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* put 0xffff in the mode field when they mean 0xffffffff.
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* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
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*/
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if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
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iap->ia_valid |= ATTR_MODE;
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iap->ia_mode = tmp;
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}
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if ((tmp = ntohl(*p++)) != (u32)-1) {
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iap->ia_valid |= ATTR_UID;
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iap->ia_uid = tmp;
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}
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if ((tmp = ntohl(*p++)) != (u32)-1) {
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iap->ia_valid |= ATTR_GID;
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iap->ia_gid = tmp;
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}
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if ((tmp = ntohl(*p++)) != (u32)-1) {
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iap->ia_valid |= ATTR_SIZE;
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iap->ia_size = tmp;
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}
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tmp = ntohl(*p++); tmp1 = ntohl(*p++);
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if (tmp != (u32)-1 && tmp1 != (u32)-1) {
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iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
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iap->ia_atime.tv_sec = tmp;
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iap->ia_atime.tv_nsec = tmp1 * 1000;
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}
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tmp = ntohl(*p++); tmp1 = ntohl(*p++);
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if (tmp != (u32)-1 && tmp1 != (u32)-1) {
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iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
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iap->ia_mtime.tv_sec = tmp;
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iap->ia_mtime.tv_nsec = tmp1 * 1000;
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/*
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* Passing the invalid value useconds=1000000 for mtime
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* is a Sun convention for "set both mtime and atime to
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* current server time". It's needed to make permissions
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* checks for the "touch" program across v2 mounts to
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* Solaris and 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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if (tmp1 == 1000000)
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iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
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}
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return p;
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}
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static inline u32 *
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encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
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{
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struct vfsmount *mnt = fhp->fh_export->ex_mnt;
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struct dentry *dentry = fhp->fh_dentry;
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struct kstat stat;
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int type;
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struct timespec time;
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vfs_getattr(mnt, dentry, &stat);
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type = (stat.mode & S_IFMT);
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*p++ = htonl(nfs_ftypes[type >> 12]);
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*p++ = htonl((u32) stat.mode);
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*p++ = htonl((u32) stat.nlink);
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*p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
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*p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
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if (S_ISLNK(type) && stat.size > NFS_MAXPATHLEN) {
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*p++ = htonl(NFS_MAXPATHLEN);
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} else {
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*p++ = htonl((u32) stat.size);
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}
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*p++ = htonl((u32) stat.blksize);
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if (S_ISCHR(type) || S_ISBLK(type))
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*p++ = htonl(new_encode_dev(stat.rdev));
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else
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*p++ = htonl(0xffffffff);
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*p++ = htonl((u32) stat.blocks);
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if (is_fsid(fhp, rqstp->rq_reffh))
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*p++ = htonl((u32) fhp->fh_export->ex_fsid);
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else
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*p++ = htonl(new_encode_dev(stat.dev));
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*p++ = htonl((u32) stat.ino);
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*p++ = htonl((u32) stat.atime.tv_sec);
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*p++ = htonl(stat.atime.tv_nsec ? stat.atime.tv_nsec / 1000 : 0);
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lease_get_mtime(dentry->d_inode, &time);
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*p++ = htonl((u32) time.tv_sec);
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*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
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*p++ = htonl((u32) stat.ctime.tv_sec);
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*p++ = htonl(stat.ctime.tv_nsec ? stat.ctime.tv_nsec / 1000 : 0);
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return p;
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}
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/*
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* XDR decode functions
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*/
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int
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nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
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{
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
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{
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if (!(p = decode_fh(p, &args->fh)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_sattrargs *args)
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{
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if (!(p = decode_fh(p, &args->fh))
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|| !(p = decode_sattr(p, &args->attrs)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_diropargs *args)
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{
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if (!(p = decode_fh(p, &args->fh))
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|| !(p = decode_filename(p, &args->name, &args->len)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_readargs *args)
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{
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unsigned int len;
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int v,pn;
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if (!(p = decode_fh(p, &args->fh)))
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return 0;
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args->offset = ntohl(*p++);
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len = args->count = ntohl(*p++);
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p++; /* totalcount - unused */
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if (len > NFSSVC_MAXBLKSIZE)
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len = NFSSVC_MAXBLKSIZE;
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/* set up somewhere to store response.
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* We take pages, put them on reslist and include in iovec
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*/
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v=0;
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while (len > 0) {
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pn=rqstp->rq_resused;
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svc_take_page(rqstp);
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args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
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args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
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len -= args->vec[v].iov_len;
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v++;
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}
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args->vlen = v;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_writeargs *args)
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{
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unsigned int len;
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int v;
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if (!(p = decode_fh(p, &args->fh)))
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return 0;
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p++; /* beginoffset */
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args->offset = ntohl(*p++); /* offset */
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p++; /* totalcount */
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len = args->len = ntohl(*p++);
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args->vec[0].iov_base = (void*)p;
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args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
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(((void*)p) - rqstp->rq_arg.head[0].iov_base);
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if (len > NFSSVC_MAXBLKSIZE)
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len = NFSSVC_MAXBLKSIZE;
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v = 0;
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while (len > args->vec[v].iov_len) {
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len -= args->vec[v].iov_len;
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v++;
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args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
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args->vec[v].iov_len = PAGE_SIZE;
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}
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args->vec[v].iov_len = len;
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args->vlen = v+1;
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return args->vec[0].iov_len > 0;
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}
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int
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nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_createargs *args)
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{
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if (!(p = decode_fh(p, &args->fh))
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|| !(p = decode_filename(p, &args->name, &args->len))
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|| !(p = decode_sattr(p, &args->attrs)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_renameargs *args)
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{
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if (!(p = decode_fh(p, &args->ffh))
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|| !(p = decode_filename(p, &args->fname, &args->flen))
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|| !(p = decode_fh(p, &args->tfh))
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|| !(p = decode_filename(p, &args->tname, &args->tlen)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkargs *args)
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{
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if (!(p = decode_fh(p, &args->fh)))
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return 0;
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svc_take_page(rqstp);
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args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_linkargs *args)
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{
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if (!(p = decode_fh(p, &args->ffh))
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|| !(p = decode_fh(p, &args->tfh))
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|| !(p = decode_filename(p, &args->tname, &args->tlen)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_symlinkargs *args)
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{
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if (!(p = decode_fh(p, &args->ffh))
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|| !(p = decode_filename(p, &args->fname, &args->flen))
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|| !(p = decode_pathname(p, &args->tname, &args->tlen))
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|| !(p = decode_sattr(p, &args->attrs)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_readdirargs *args)
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{
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if (!(p = decode_fh(p, &args->fh)))
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return 0;
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args->cookie = ntohl(*p++);
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args->count = ntohl(*p++);
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if (args->count > PAGE_SIZE)
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args->count = PAGE_SIZE;
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svc_take_page(rqstp);
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args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
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return xdr_argsize_check(rqstp, p);
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}
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/*
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* XDR encode functions
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*/
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int
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nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
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{
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_attrstat *resp)
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{
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p = encode_fattr(rqstp, p, &resp->fh);
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_diropres *resp)
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{
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p = encode_fh(p, &resp->fh);
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p = encode_fattr(rqstp, p, &resp->fh);
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_readlinkres *resp)
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{
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*p++ = htonl(resp->len);
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xdr_ressize_check(rqstp, p);
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rqstp->rq_res.page_len = resp->len;
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if (resp->len & 3) {
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/* need to pad the tail */
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rqstp->rq_restailpage = 0;
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rqstp->rq_res.tail[0].iov_base = p;
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*p = 0;
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rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
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}
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return 1;
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}
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int
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nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_readres *resp)
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{
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p = encode_fattr(rqstp, p, &resp->fh);
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*p++ = htonl(resp->count);
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xdr_ressize_check(rqstp, p);
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/* now update rqstp->rq_res to reflect data aswell */
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rqstp->rq_res.page_len = resp->count;
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if (resp->count & 3) {
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/* need to pad the tail */
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rqstp->rq_restailpage = 0;
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rqstp->rq_res.tail[0].iov_base = p;
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*p = 0;
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rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
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}
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return 1;
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}
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int
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nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_readdirres *resp)
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{
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xdr_ressize_check(rqstp, p);
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p = resp->buffer;
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*p++ = 0; /* no more entries */
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*p++ = htonl((resp->common.err == nfserr_eof));
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rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
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return 1;
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}
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int
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nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd_statfsres *resp)
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{
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struct kstatfs *stat = &resp->stats;
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*p++ = htonl(NFSSVC_MAXBLKSIZE); /* max transfer size */
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*p++ = htonl(stat->f_bsize);
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*p++ = htonl(stat->f_blocks);
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*p++ = htonl(stat->f_bfree);
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*p++ = htonl(stat->f_bavail);
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
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int namlen, loff_t offset, ino_t ino, unsigned int d_type)
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{
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struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
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u32 *p = cd->buffer;
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int buflen, slen;
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/*
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dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
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namlen, name, offset, ino);
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*/
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if (offset > ~((u32) 0)) {
|
|
cd->common.err = nfserr_fbig;
|
|
return -EINVAL;
|
|
}
|
|
if (cd->offset)
|
|
*cd->offset = htonl(offset);
|
|
if (namlen > NFS2_MAXNAMLEN)
|
|
namlen = NFS2_MAXNAMLEN;/* truncate filename */
|
|
|
|
slen = XDR_QUADLEN(namlen);
|
|
if ((buflen = cd->buflen - slen - 4) < 0) {
|
|
cd->common.err = nfserr_toosmall;
|
|
return -EINVAL;
|
|
}
|
|
*p++ = xdr_one; /* mark entry present */
|
|
*p++ = htonl((u32) ino); /* file id */
|
|
p = xdr_encode_array(p, name, namlen);/* name length & name */
|
|
cd->offset = p; /* remember pointer */
|
|
*p++ = ~(u32) 0; /* offset of next entry */
|
|
|
|
cd->buflen = buflen;
|
|
cd->buffer = p;
|
|
cd->common.err = nfs_ok;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XDR release functions
|
|
*/
|
|
int
|
|
nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd_fhandle *resp)
|
|
{
|
|
fh_put(&resp->fh);
|
|
return 1;
|
|
}
|