1 files changed, 511 insertions, 0 deletions

diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
new file mode 100644
index 000000000000..948b08287c99
--- /dev/null
+++ b/fs/nfsd/nfsxdr.c
@@ -0,0 +1,511 @@
+/*
+ * 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/time.h>
+#include <linux/nfs.h>
+#include <linux/vfs.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/xdr.h>
+#include <linux/mm.h>
+
+#define NFSDDBG_FACILITY                NFSDDBG_XDR
+
+
+#ifdef NFSD_OPTIMIZE_SPACE
+# define inline
+#endif
+
+/*
+ * Mapping of S_IF* types to NFS file types
+ */
+static u32      nfs_ftypes[] = {
+        NFNON,  NFCHR,  NFCHR, NFBAD,
+        NFDIR,  NFBAD,  NFBLK, NFBAD,
+        NFREG,  NFBAD,  NFLNK, NFBAD,
+        NFSOCK, NFBAD,  NFLNK, NFBAD,
+};
+
+
+/*
+ * XDR functions for basic NFS types
+ */
+static inline u32 *
+decode_fh(u32 *p, struct svc_fh *fhp)
+{
+        fh_init(fhp, NFS_FHSIZE);
+        memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
+        fhp->fh_handle.fh_size = NFS_FHSIZE;
+
+        /* FIXME: Look up export pointer here and verify
+         * Sun Secure RPC if requested */
+        return p + (NFS_FHSIZE >> 2);
+}
+
+static inline u32 *
+encode_fh(u32 *p, struct svc_fh *fhp)
+{
+        memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
+        return p + (NFS_FHSIZE>> 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_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
+                for (i = 0, name = *namp; i < *lenp; i++, name++) {
+                        if (*name == '\0' || *name == '/')
+                                return NULL;
+                }
+        }
+
+        return p;
+}
+
+static inline u32 *
+decode_pathname(u32 *p, char **namp, int *lenp)
+{
+        char            *name;
+        int             i;
+
+        if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
+                for (i = 0, name = *namp; i < *lenp; i++, name++) {
+                        if (*name == '\0')
+                                return NULL;
+                }
+        }
+
+        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.tv_sec = tmp;
+                iap->ia_atime.tv_nsec = tmp1 * 1000; 
+        }
+        tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
+        if (tmp != (u32)-1 && tmp1 != (u32)-1) {
+                iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
+                iap->ia_mtime.tv_sec = tmp;
+                iap->ia_mtime.tv_nsec = tmp1 * 1000; 
+                /*
+                 * Passing the invalid value useconds=1000000 for mtime
+                 * is a Sun convention for "set both mtime and atime to
+                 * current server time".  It's needed to make permissions
+                 * checks for the "touch" program across v2 mounts to
+                 * Solaris and Irix boxes work correctly. See description of
+                 * sattr in section 6.1 of "NFS Illustrated" by
+                 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
+                 */
+                if (tmp1 == 1000000)
+                        iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
+        }
+        return p;
+}
+
+static inline u32 *
+encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
+{
+        struct vfsmount *mnt = fhp->fh_export->ex_mnt;
+        struct dentry   *dentry = fhp->fh_dentry;
+        struct kstat stat;
+        int type;
+        struct timespec time;
+
+        vfs_getattr(mnt, dentry, &stat);
+        type = (stat.mode & S_IFMT);
+
+        *p++ = htonl(nfs_ftypes[type >> 12]);
+        *p++ = htonl((u32) stat.mode);
+        *p++ = htonl((u32) stat.nlink);
+        *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
+        *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
+
+        if (S_ISLNK(type) && stat.size > NFS_MAXPATHLEN) {
+                *p++ = htonl(NFS_MAXPATHLEN);
+        } else {
+                *p++ = htonl((u32) stat.size);
+        }
+        *p++ = htonl((u32) stat.blksize);
+        if (S_ISCHR(type) || S_ISBLK(type))
+                *p++ = htonl(new_encode_dev(stat.rdev));
+        else
+                *p++ = htonl(0xffffffff);
+        *p++ = htonl((u32) stat.blocks);
+        if (is_fsid(fhp, rqstp->rq_reffh))
+                *p++ = htonl((u32) fhp->fh_export->ex_fsid);
+        else
+                *p++ = htonl(new_encode_dev(stat.dev));
+        *p++ = htonl((u32) stat.ino);
+        *p++ = htonl((u32) stat.atime.tv_sec);
+        *p++ = htonl(stat.atime.tv_nsec ? stat.atime.tv_nsec / 1000 : 0);
+        lease_get_mtime(dentry->d_inode, &time); 
+        *p++ = htonl((u32) time.tv_sec);
+        *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 
+        *p++ = htonl((u32) stat.ctime.tv_sec);
+        *p++ = htonl(stat.ctime.tv_nsec ? stat.ctime.tv_nsec / 1000 : 0);
+
+        return p;
+}
+
+
+/*
+ * 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 nfsd_fhandle *args)
+{
+        if (!(p = decode_fh(p, &args->fh)))
+                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)
+{
+        unsigned int len;
+        int v,pn;
+        if (!(p = decode_fh(p, &args->fh)))
+                return 0;
+
+        args->offset    = ntohl(*p++);
+        len = args->count     = ntohl(*p++);
+        p++; /* totalcount - unused */
+
+        if (len > NFSSVC_MAXBLKSIZE)
+                len = NFSSVC_MAXBLKSIZE;
+
+        /* set up somewhere to store response.
+         * We take pages, put them on reslist and include in iovec
+         */
+        v=0;
+        while (len > 0) {
+                pn=rqstp->rq_resused;
+                svc_take_page(rqstp);
+                args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
+                args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
+                len -= args->vec[v].iov_len;
+                v++;
+        }
+        args->vlen = v;
+        return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
+                                        struct nfsd_writeargs *args)
+{
+        unsigned int len;
+        int v;
+        if (!(p = decode_fh(p, &args->fh)))
+                return 0;
+
+        p++;                            /* beginoffset */
+        args->offset = ntohl(*p++);     /* offset */
+        p++;                            /* totalcount */
+        len = args->len = ntohl(*p++);
+        args->vec[0].iov_base = (void*)p;
+        args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
+                                (((void*)p) - rqstp->rq_arg.head[0].iov_base);
+        if (len > NFSSVC_MAXBLKSIZE)
+                len = NFSSVC_MAXBLKSIZE;
+        v = 0;
+        while (len > args->vec[v].iov_len) {
+                len -= args->vec[v].iov_len;
+                v++;
+                args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
+                args->vec[v].iov_len = PAGE_SIZE;
+        }
+        args->vec[v].iov_len = len;
+        args->vlen = v+1;
+        return args->vec[0].iov_len > 0;
+}
+
+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_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkargs *args)
+{
+        if (!(p = decode_fh(p, &args->fh)))
+                return 0;
+        svc_take_page(rqstp);
+        args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
+
+        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++);
+        if (args->count > PAGE_SIZE)
+                args->count = PAGE_SIZE;
+
+        svc_take_page(rqstp);
+        args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
+
+        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)
+{
+        p = encode_fattr(rqstp, p, &resp->fh);
+        return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
+                                        struct nfsd_diropres *resp)
+{
+        p = encode_fh(p, &resp->fh);
+        p = encode_fattr(rqstp, p, &resp->fh);
+        return xdr_ressize_check(rqstp, p);
+}
+
+int
+nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
+                                        struct nfsd_readlinkres *resp)
+{
+        *p++ = htonl(resp->len);
+        xdr_ressize_check(rqstp, p);
+        rqstp->rq_res.page_len = resp->len;
+        if (resp->len & 3) {
+                /* need to pad the tail */
+                rqstp->rq_restailpage = 0;
+                rqstp->rq_res.tail[0].iov_base = p;
+                *p = 0;
+                rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
+        }
+        return 1;
+}
+
+int
+nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
+                                        struct nfsd_readres *resp)
+{
+        p = encode_fattr(rqstp, p, &resp->fh);
+        *p++ = htonl(resp->count);
+        xdr_ressize_check(rqstp, p);
+
+        /* now update rqstp->rq_res to reflect data aswell */
+        rqstp->rq_res.page_len = resp->count;
+        if (resp->count & 3) {
+                /* need to pad the tail */
+                rqstp->rq_restailpage = 0;
+                rqstp->rq_res.tail[0].iov_base = p;
+                *p = 0;
+                rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
+        }
+        return 1;
+}
+
+int
+nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
+                                        struct nfsd_readdirres *resp)
+{
+        xdr_ressize_check(rqstp, p);
+        p = resp->buffer;
+        *p++ = 0;                       /* no more entries */
+        *p++ = htonl((resp->common.err == nfserr_eof));
+        rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
+
+        return 1;
+}
+
+int
+nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
+                                        struct nfsd_statfsres *resp)
+{
+        struct kstatfs  *stat = &resp->stats;
+
+        *p++ = htonl(NFSSVC_MAXBLKSIZE);        /* 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 *ccd, const char *name,
+                    int namlen, loff_t offset, ino_t ino, unsigned int d_type)
+{
+        struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
+        u32     *p = cd->buffer;
+        int     buflen, slen;
+
+        /*
+        dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
+                        namlen, name, offset, ino);
+         */
+
+        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;
+}