patch-2.1.32 linux/fs/nfsd/nfsxdr.c

• Lines: 471
• Date: Fri Apr 4 11:06:02 1997
• Orig file: v2.1.31/linux/fs/nfsd/nfsxdr.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/fs/nfsd/nfsxdr.c linux/fs/nfsd/nfsxdr.c
@@ -0,0 +1,470 @@
+/*
+ * linux/fs/nfsd/xdr.c
+ *
+ * XDR support for nfsd
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/nfs.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/xdr.h>
+
+#define NFSDDBG_FACILITY		NFSDDBG_XDR
+
+u32	nfs_ok, nfserr_perm, nfserr_noent, nfserr_io, nfserr_nxio,
+	nfserr_acces, nfserr_exist, nfserr_nodev, nfserr_notdir,
+	nfserr_isdir, nfserr_fbig, nfserr_nospc, nfserr_rofs,
+	nfserr_nametoolong, nfserr_dquot, nfserr_stale;
+
+#ifdef NFSD_OPTIMIZE_SPACE
+# define inline
+#endif
+
+/*
+ * Mapping of S_IF* types to NFS file types
+ */
+static u32	nfs_ftypes[] = {
+	NFNON,  NFFIFO, NFCHR, NFBAD,
+	NFDIR,  NFBAD,  NFBLK, NFBAD,
+	NFREG,  NFBAD,  NFLNK, NFBAD,
+	NFSOCK, NFBAD,  NFLNK, NFBAD,
+};
+
+/*
+ * Initialization of NFS status variables
+ */
+void
+nfsd_xdr_init(void)
+{
+	static int	inited = 0;
+
+	if (inited)
+		return;
+
+	nfs_ok = htonl(NFS_OK);
+	nfserr_perm = htonl(NFSERR_PERM);
+	nfserr_noent = htonl(NFSERR_NOENT);
+	nfserr_io = htonl(NFSERR_IO);
+	nfserr_nxio = htonl(NFSERR_NXIO);
+	nfserr_acces = htonl(NFSERR_ACCES);
+	nfserr_exist = htonl(NFSERR_EXIST);
+	nfserr_nodev = htonl(NFSERR_NODEV);
+	nfserr_notdir = htonl(NFSERR_NOTDIR);
+	nfserr_isdir = htonl(NFSERR_ISDIR);
+	nfserr_fbig = htonl(NFSERR_FBIG);
+	nfserr_nospc = htonl(NFSERR_NOSPC);
+	nfserr_rofs = htonl(NFSERR_ROFS);
+	nfserr_nametoolong = htonl(NFSERR_NAMETOOLONG);
+	nfserr_dquot = htonl(NFSERR_DQUOT);
+	nfserr_stale = htonl(NFSERR_STALE);
+
+	inited = 1;
+}
+
+/*
+ * XDR functions for basic NFS types
+ */
+static inline u32 *
+decode_fh(u32 *p, struct svc_fh *fhp)
+{
+	fh_init(fhp);
+	memcpy(&fhp->fh_handle, p, sizeof(struct knfs_fh));
+
+	/* FIXME: Look up export pointer here and verify
+	 * Sun Secure RPC if requested */
+	return p + (sizeof(struct knfs_fh) >> 2);
+}
+
+static inline u32 *
+encode_fh(u32 *p, struct svc_fh *fhp)
+{
+	memcpy(p, &fhp->fh_handle, sizeof(struct knfs_fh));
+	return p + (sizeof(struct knfs_fh) >> 2);
+}
+
+/*
+ * Decode a file name and make sure that the path contains
+ * no slashes or null bytes.
+ */
+static inline u32 *
+decode_filename(u32 *p, char **namp, int *lenp)
+{
+	char		*name;
+	int		i;
+
+	if ((p = xdr_decode_string(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
+		for (i = 0, name = *namp; i < *lenp; i++, name++) {
+			if (*name == '\0' || *name == '/')
+				return NULL;
+		}
+		*name = '\0';
+	}
+
+	return p;
+}
+
+static inline u32 *
+decode_pathname(u32 *p, char **namp, int *lenp)
+{
+	char		*name;
+	int		i;
+
+	if ((p = xdr_decode_string(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
+		for (i = 0, name = *namp; i < *lenp; i++, name++) {
+			if (*name == '\0')
+				return NULL;
+		}
+		*name = '\0';
+	}
+
+	return p;
+}
+
+static inline u32 *
+decode_sattr(u32 *p, struct iattr *iap)
+{
+	u32	tmp, tmp1;
+
+	iap->ia_valid = 0;
+
+	/* Sun client bug compatibility check: some sun clients seem to
+	 * put 0xffff in the mode field when they mean 0xffffffff.
+	 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
+	 */
+	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
+		iap->ia_valid |= ATTR_MODE;
+		iap->ia_mode = tmp;
+	}
+	if ((tmp = ntohl(*p++)) != (u32)-1) {
+		iap->ia_valid |= ATTR_UID;
+		iap->ia_uid = tmp;
+	}
+	if ((tmp = ntohl(*p++)) != (u32)-1) {
+		iap->ia_valid |= ATTR_GID;
+		iap->ia_gid = tmp;
+	}
+	if ((tmp = ntohl(*p++)) != (u32)-1) {
+		iap->ia_valid |= ATTR_SIZE;
+		iap->ia_size = tmp;
+	}
+	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
+	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
+		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
+		iap->ia_atime = tmp;
+	}
+	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
+	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
+		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
+		iap->ia_mtime = tmp;
+	}
+	return p;
+}
+
+static inline u32 *
+encode_fattr(struct svc_rqst *rqstp, u32 *p, struct inode *inode)
+{
+	if (!inode)
+		return 0;
+	*p++ = htonl(nfs_ftypes[(inode->i_mode & S_IFMT) >> 12]);
+	*p++ = htonl((u32) inode->i_mode);
+	*p++ = htonl((u32) inode->i_nlink);
+	*p++ = htonl((u32) nfsd_ruid(rqstp, inode->i_uid));
+	*p++ = htonl((u32) nfsd_rgid(rqstp, inode->i_gid));
+	if (S_ISLNK(inode->i_mode) && inode->i_size > NFS_MAXPATHLEN) {
+		*p++ = htonl(NFS_MAXPATHLEN);
+	} else {
+		*p++ = htonl((u32) inode->i_size);
+	}
+	*p++ = htonl((u32) inode->i_blksize);
+	*p++ = htonl((u32) inode->i_rdev);
+	*p++ = htonl((u32) inode->i_blocks);
+	*p++ = htonl((u32) inode->i_dev);
+	*p++ = htonl((u32) inode->i_ino);
+	*p++ = htonl((u32) inode->i_atime);
+	*p++ = 0;
+	*p++ = htonl((u32) inode->i_mtime);
+	*p++ = 0;
+	*p++ = htonl((u32) inode->i_ctime);
+	*p++ = 0;
+
+	return p;
+}
+
+/*
+ * Check buffer bounds after decoding arguments
+ */
+static inline int
+xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
+{
+	struct svc_buf	*buf = &rqstp->rq_argbuf;
+
+	return p - buf->base <= buf->buflen;
+}
+
+static inline int
+xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
+{
+	struct svc_buf	*buf = &rqstp->rq_resbuf;
+
+	buf->len = p - buf->base;
+	dprintk("nfsd: ressize_check p %p base %p len %d\n",
+			p, buf->base, buf->buflen);
+	return (buf->len <= buf->buflen);
+}
+
+/*
+ * XDR decode functions
+ */
+int
+nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
+{
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
+{
+	if (!(p = decode_fh(p, fhp)))
+		return 0;
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_sattrargs *args)
+{
+	if (!(p = decode_fh(p, &args->fh))
+	 || !(p = decode_sattr(p, &args->attrs)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_diropargs *args)
+{
+	if (!(p = decode_fh(p, &args->fh))
+	 || !(p = decode_filename(p, &args->name, &args->len)))
+		return 0;
+
+	 return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_readargs *args)
+{
+	if (!(p = decode_fh(p, &args->fh)))
+		return 0;
+
+	args->offset    = ntohl(*p++);
+	args->count     = ntohl(*p++);
+	args->totalsize = ntohl(*p++);
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_writeargs *args)
+{
+	if (!(p = decode_fh(p, &args->fh)))
+		return 0;
+
+	p++;				/* beginoffset */
+	args->offset = ntohl(*p++);	/* offset */
+	p++;				/* totalcount */
+	args->len = ntohl(*p++);
+	args->data = (char *) p;
+	p += XDR_QUADLEN(args->len);
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_createargs *args)
+{
+	if (!(p = decode_fh(p, &args->fh))
+	 || !(p = decode_filename(p, &args->name, &args->len))
+	 || !(p = decode_sattr(p, &args->attrs)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_renameargs *args)
+{
+	if (!(p = decode_fh(p, &args->ffh))
+	 || !(p = decode_filename(p, &args->fname, &args->flen))
+	 || !(p = decode_fh(p, &args->tfh))
+	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_linkargs *args)
+{
+	if (!(p = decode_fh(p, &args->ffh))
+	 || !(p = decode_fh(p, &args->tfh))
+	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_symlinkargs *args)
+{
+	if (!(p = decode_fh(p, &args->ffh))
+	 || !(p = decode_filename(p, &args->fname, &args->flen))
+	 || !(p = decode_pathname(p, &args->tname, &args->tlen))
+	 || !(p = decode_sattr(p, &args->attrs)))
+		return 0;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_readdirargs *args)
+{
+	if (!(p = decode_fh(p, &args->fh)))
+		return 0;
+	args->cookie = ntohl(*p++);
+	args->count  = ntohl(*p++);
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+/*
+ * XDR encode functions
+ */
+int
+nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
+{
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_attrstat *resp)
+{
+	if (!(p = encode_fattr(rqstp, p, resp->fh.fh_inode)))
+		return 0;
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_diropres *resp)
+{
+	if (!(p = encode_fh(p, &resp->fh))
+	 || !(p = encode_fattr(rqstp, p, resp->fh.fh_inode)))
+		return 0;
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_readlinkres *resp)
+{
+	*p++ = htonl(resp->len);
+	p += XDR_QUADLEN(resp->len);
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_readres *resp)
+{
+	if (!(p = encode_fattr(rqstp, p, resp->fh.fh_inode)))
+		return 0;
+	*p++ = htonl(resp->count);
+	p += XDR_QUADLEN(resp->count);
+
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_readdirres *resp)
+{
+	p += XDR_QUADLEN(resp->count);
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
+					struct nfsd_statfsres *resp)
+{
+	struct statfs	*stat = &resp->stats;
+
+	*p++ = htonl(8 * 1024);		/* max transfer size */
+	*p++ = htonl(stat->f_bsize);
+	*p++ = htonl(stat->f_blocks);
+	*p++ = htonl(stat->f_bfree);
+	*p++ = htonl(stat->f_bavail);
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_entry(struct readdir_cd *cd, const char *name,
+					int namlen, off_t offset, ino_t ino)
+{
+	u32	*p = cd->buffer;
+	int	buflen, slen;
+
+	/*
+	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
+			namlen, name, offset, ino);
+	 */
+
+	if (offset > ~((u32) 0))
+		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->eob = 1;
+		return -EINVAL;
+	}
+	*p++ = xdr_one;			/* mark entry present */
+	*p++ = htonl((u32) ino);	/* file id */
+	*p++ = htonl((u32) namlen);	/* name length & name */
+	memcpy(p, name, namlen);
+	p += slen;
+	cd->offset = p;			/* remember pointer */
+	*p++ = ~(u32) 0;		/* offset of next entry */
+
+	cd->buflen = buflen;
+	cd->buffer = p;
+	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;
+}