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-rw-r--r--fs/nfsd/nfs3xdr.c1092
1 files changed, 1092 insertions, 0 deletions
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
new file mode 100644
index 00000000000..11f806835c5
--- /dev/null
+++ b/fs/nfsd/nfs3xdr.c
@@ -0,0 +1,1092 @@
+/*
+ * linux/fs/nfsd/nfs3xdr.c
+ *
+ * XDR support for nfsd/protocol version 3.
+ *
+ * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
+ *
+ * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
+ */
+
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/nfs3.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/dcache.h>
+#include <linux/namei.h>
+#include <linux/mm.h>
+#include <linux/vfs.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/xdr3.h>
+
+#define NFSDDBG_FACILITY NFSDDBG_XDR
+
+#ifdef NFSD_OPTIMIZE_SPACE
+# define inline
+#endif
+
+
+/*
+ * Mapping of S_IF* types to NFS file types
+ */
+static u32 nfs3_ftypes[] = {
+ NF3NON, NF3FIFO, NF3CHR, NF3BAD,
+ NF3DIR, NF3BAD, NF3BLK, NF3BAD,
+ NF3REG, NF3BAD, NF3LNK, NF3BAD,
+ NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
+};
+
+/*
+ * XDR functions for basic NFS types
+ */
+static inline u32 *
+encode_time3(u32 *p, struct timespec *time)
+{
+ *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
+ return p;
+}
+
+static inline u32 *
+decode_time3(u32 *p, struct timespec *time)
+{
+ time->tv_sec = ntohl(*p++);
+ time->tv_nsec = ntohl(*p++);
+ return p;
+}
+
+static inline u32 *
+decode_fh(u32 *p, struct svc_fh *fhp)
+{
+ unsigned int size;
+ fh_init(fhp, NFS3_FHSIZE);
+ size = ntohl(*p++);
+ if (size > NFS3_FHSIZE)
+ return NULL;
+
+ memcpy(&fhp->fh_handle.fh_base, p, size);
+ fhp->fh_handle.fh_size = size;
+ return p + XDR_QUADLEN(size);
+}
+
+static inline u32 *
+encode_fh(u32 *p, struct svc_fh *fhp)
+{
+ unsigned int size = fhp->fh_handle.fh_size;
+ *p++ = htonl(size);
+ if (size) p[XDR_QUADLEN(size)-1]=0;
+ memcpy(p, &fhp->fh_handle.fh_base, size);
+ return p + XDR_QUADLEN(size);
+}
+
+/*
+ * 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, NFS3_MAXNAMLEN)) != NULL) {
+ for (i = 0, name = *namp; i < *lenp; i++, name++) {
+ if (*name == '\0' || *name == '/')
+ return NULL;
+ }
+ }
+
+ return p;
+}
+
+static inline u32 *
+decode_sattr3(u32 *p, struct iattr *iap)
+{
+ u32 tmp;
+
+ iap->ia_valid = 0;
+
+ if (*p++) {
+ iap->ia_valid |= ATTR_MODE;
+ iap->ia_mode = ntohl(*p++);
+ }
+ if (*p++) {
+ iap->ia_valid |= ATTR_UID;
+ iap->ia_uid = ntohl(*p++);
+ }
+ if (*p++) {
+ iap->ia_valid |= ATTR_GID;
+ iap->ia_gid = ntohl(*p++);
+ }
+ if (*p++) {
+ u64 newsize;
+
+ iap->ia_valid |= ATTR_SIZE;
+ p = xdr_decode_hyper(p, &newsize);
+ if (newsize <= NFS_OFFSET_MAX)
+ iap->ia_size = newsize;
+ else
+ iap->ia_size = NFS_OFFSET_MAX;
+ }
+ if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
+ iap->ia_valid |= ATTR_ATIME;
+ } else if (tmp == 2) { /* set to client time */
+ iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
+ iap->ia_atime.tv_sec = ntohl(*p++);
+ iap->ia_atime.tv_nsec = ntohl(*p++);
+ }
+ if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
+ iap->ia_valid |= ATTR_MTIME;
+ } else if (tmp == 2) { /* set to client time */
+ iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
+ iap->ia_mtime.tv_sec = ntohl(*p++);
+ iap->ia_mtime.tv_nsec = ntohl(*p++);
+ }
+ return p;
+}
+
+static inline u32 *
+encode_fattr3(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;
+ struct timespec time;
+
+ vfs_getattr(mnt, dentry, &stat);
+
+ *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 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(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
+ p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
+ } else {
+ p = xdr_encode_hyper(p, (u64) stat.size);
+ }
+ p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
+ *p++ = htonl((u32) MAJOR(stat.rdev));
+ *p++ = htonl((u32) MINOR(stat.rdev));
+ if (is_fsid(fhp, rqstp->rq_reffh))
+ p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
+ else
+ p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
+ p = xdr_encode_hyper(p, (u64) stat.ino);
+ p = encode_time3(p, &stat.atime);
+ lease_get_mtime(dentry->d_inode, &time);
+ p = encode_time3(p, &time);
+ p = encode_time3(p, &stat.ctime);
+
+ return p;
+}
+
+static inline u32 *
+encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
+{
+ struct inode *inode = fhp->fh_dentry->d_inode;
+
+ /* Attributes to follow */
+ *p++ = xdr_one;
+
+ *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
+ *p++ = htonl((u32) fhp->fh_post_mode);
+ *p++ = htonl((u32) fhp->fh_post_nlink);
+ *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
+ *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
+ if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
+ p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
+ } else {
+ p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
+ }
+ p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
+ *p++ = fhp->fh_post_rdev[0];
+ *p++ = fhp->fh_post_rdev[1];
+ if (is_fsid(fhp, rqstp->rq_reffh))
+ p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
+ else
+ p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
+ p = xdr_encode_hyper(p, (u64) inode->i_ino);
+ p = encode_time3(p, &fhp->fh_post_atime);
+ p = encode_time3(p, &fhp->fh_post_mtime);
+ p = encode_time3(p, &fhp->fh_post_ctime);
+
+ return p;
+}
+
+/*
+ * Encode post-operation attributes.
+ * The inode may be NULL if the call failed because of a stale file
+ * handle. In this case, no attributes are returned.
+ */
+static u32 *
+encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
+{
+ struct dentry *dentry = fhp->fh_dentry;
+ if (dentry && dentry->d_inode != NULL) {
+ *p++ = xdr_one; /* attributes follow */
+ return encode_fattr3(rqstp, p, fhp);
+ }
+ *p++ = xdr_zero;
+ return p;
+}
+
+/*
+ * Enocde weak cache consistency data
+ */
+static u32 *
+encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
+{
+ struct dentry *dentry = fhp->fh_dentry;
+
+ if (dentry && dentry->d_inode && fhp->fh_post_saved) {
+ if (fhp->fh_pre_saved) {
+ *p++ = xdr_one;
+ p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
+ p = encode_time3(p, &fhp->fh_pre_mtime);
+ p = encode_time3(p, &fhp->fh_pre_ctime);
+ } else {
+ *p++ = xdr_zero;
+ }
+ return encode_saved_post_attr(rqstp, p, fhp);
+ }
+ /* no pre- or post-attrs */
+ *p++ = xdr_zero;
+ return encode_post_op_attr(rqstp, p, fhp);
+}
+
+
+/*
+ * XDR decode functions
+ */
+int
+nfs3svc_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
+nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_sattrargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh))
+ || !(p = decode_sattr3(p, &args->attrs)))
+ return 0;
+
+ if ((args->check_guard = ntohl(*p++)) != 0) {
+ struct timespec time;
+ p = decode_time3(p, &time);
+ args->guardtime = time.tv_sec;
+ }
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_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
+nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_accessargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh)))
+ return 0;
+ args->access = ntohl(*p++);
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_readargs *args)
+{
+ unsigned int len;
+ int v,pn;
+
+ if (!(p = decode_fh(p, &args->fh))
+ || !(p = xdr_decode_hyper(p, &args->offset)))
+ return 0;
+
+ len = args->count = ntohl(*p++);
+
+ if (len > NFSSVC_MAXBLKSIZE)
+ len = NFSSVC_MAXBLKSIZE;
+
+ /* set up the kvec */
+ 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
+nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_writeargs *args)
+{
+ unsigned int len, v, hdr;
+
+ if (!(p = decode_fh(p, &args->fh))
+ || !(p = xdr_decode_hyper(p, &args->offset)))
+ return 0;
+
+ args->count = ntohl(*p++);
+ args->stable = ntohl(*p++);
+ len = args->len = ntohl(*p++);
+
+ hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
+ if (rqstp->rq_arg.len < len + hdr)
+ return 0;
+
+ args->vec[0].iov_base = (void*)p;
+ args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
+
+ 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->count == args->len && args->vec[0].iov_len > 0;
+}
+
+int
+nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_createargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh))
+ || !(p = decode_filename(p, &args->name, &args->len)))
+ return 0;
+
+ switch (args->createmode = ntohl(*p++)) {
+ case NFS3_CREATE_UNCHECKED:
+ case NFS3_CREATE_GUARDED:
+ if (!(p = decode_sattr3(p, &args->attrs)))
+ return 0;
+ break;
+ case NFS3_CREATE_EXCLUSIVE:
+ args->verf = p;
+ p += 2;
+ break;
+ default:
+ return 0;
+ }
+
+ return xdr_argsize_check(rqstp, p);
+}
+int
+nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_createargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh))
+ || !(p = decode_filename(p, &args->name, &args->len))
+ || !(p = decode_sattr3(p, &args->attrs)))
+ return 0;
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_symlinkargs *args)
+{
+ unsigned int len;
+ int avail;
+ char *old, *new;
+ struct kvec *vec;
+
+ if (!(p = decode_fh(p, &args->ffh))
+ || !(p = decode_filename(p, &args->fname, &args->flen))
+ || !(p = decode_sattr3(p, &args->attrs))
+ )
+ return 0;
+ /* now decode the pathname, which might be larger than the first page.
+ * As we have to check for nul's anyway, we copy it into a new page
+ * This page appears in the rq_res.pages list, but as pages_len is always
+ * 0, it won't get in the way
+ */
+ svc_take_page(rqstp);
+ len = ntohl(*p++);
+ if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
+ return 0;
+ args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
+ args->tlen = len;
+ /* first copy and check from the first page */
+ old = (char*)p;
+ vec = &rqstp->rq_arg.head[0];
+ avail = vec->iov_len - (old - (char*)vec->iov_base);
+ while (len && avail && *old) {
+ *new++ = *old++;
+ len--;
+ avail--;
+ }
+ /* now copy next page if there is one */
+ if (len && !avail && rqstp->rq_arg.page_len) {
+ avail = rqstp->rq_arg.page_len;
+ if (avail > PAGE_SIZE) avail = PAGE_SIZE;
+ old = page_address(rqstp->rq_arg.pages[0]);
+ }
+ while (len && avail && *old) {
+ *new++ = *old++;
+ len--;
+ avail--;
+ }
+ *new = '\0';
+ if (len)
+ return 0;
+
+ return 1;
+}
+
+int
+nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_mknodargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh))
+ || !(p = decode_filename(p, &args->name, &args->len)))
+ return 0;
+
+ args->ftype = ntohl(*p++);
+
+ if (args->ftype == NF3BLK || args->ftype == NF3CHR
+ || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
+ if (!(p = decode_sattr3(p, &args->attrs)))
+ return 0;
+ }
+
+ if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
+ args->major = ntohl(*p++);
+ args->minor = ntohl(*p++);
+ }
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_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
+nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_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
+nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_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
+nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_readdirargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh)))
+ return 0;
+ p = xdr_decode_hyper(p, &args->cookie);
+ args->verf = p; p += 2;
+ args->dircount = ~0;
+ 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);
+}
+
+int
+nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_readdirargs *args)
+{
+ int len, pn;
+
+ if (!(p = decode_fh(p, &args->fh)))
+ return 0;
+ p = xdr_decode_hyper(p, &args->cookie);
+ args->verf = p; p += 2;
+ args->dircount = ntohl(*p++);
+ args->count = ntohl(*p++);
+
+ len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
+ args->count;
+ args->count = len;
+
+ while (len > 0) {
+ pn = rqstp->rq_resused;
+ svc_take_page(rqstp);
+ if (!args->buffer)
+ args->buffer = page_address(rqstp->rq_respages[pn]);
+ len -= PAGE_SIZE;
+ }
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_commitargs *args)
+{
+ if (!(p = decode_fh(p, &args->fh)))
+ return 0;
+ p = xdr_decode_hyper(p, &args->offset);
+ args->count = ntohl(*p++);
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+/*
+ * XDR encode functions
+ */
+/*
+ * There must be an encoding function for void results so svc_process
+ * will work properly.
+ */
+int
+nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
+{
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* GETATTR */
+int
+nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_attrstat *resp)
+{
+ if (resp->status == 0)
+ p = encode_fattr3(rqstp, p, &resp->fh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* SETATTR, REMOVE, RMDIR */
+int
+nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_attrstat *resp)
+{
+ p = encode_wcc_data(rqstp, p, &resp->fh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* LOOKUP */
+int
+nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_diropres *resp)
+{
+ if (resp->status == 0) {
+ p = encode_fh(p, &resp->fh);
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+ }
+ p = encode_post_op_attr(rqstp, p, &resp->dirfh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* ACCESS */
+int
+nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_accessres *resp)
+{
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+ if (resp->status == 0)
+ *p++ = htonl(resp->access);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* READLINK */
+int
+nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_readlinkres *resp)
+{
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+ if (resp->status == 0) {
+ *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;
+ } else
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* READ */
+int
+nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_readres *resp)
+{
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+ if (resp->status == 0) {
+ *p++ = htonl(resp->count);
+ *p++ = htonl(resp->eof);
+ *p++ = htonl(resp->count); /* xdr opaque 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;
+ } else
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* WRITE */
+int
+nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_writeres *resp)
+{
+ p = encode_wcc_data(rqstp, p, &resp->fh);
+ if (resp->status == 0) {
+ *p++ = htonl(resp->count);
+ *p++ = htonl(resp->committed);
+ *p++ = htonl(nfssvc_boot.tv_sec);
+ *p++ = htonl(nfssvc_boot.tv_usec);
+ }
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* CREATE, MKDIR, SYMLINK, MKNOD */
+int
+nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_diropres *resp)
+{
+ if (resp->status == 0) {
+ *p++ = xdr_one;
+ p = encode_fh(p, &resp->fh);
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+ }
+ p = encode_wcc_data(rqstp, p, &resp->dirfh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* RENAME */
+int
+nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_renameres *resp)
+{
+ p = encode_wcc_data(rqstp, p, &resp->ffh);
+ p = encode_wcc_data(rqstp, p, &resp->tfh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* LINK */
+int
+nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_linkres *resp)
+{
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+ p = encode_wcc_data(rqstp, p, &resp->tfh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* READDIR */
+int
+nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_readdirres *resp)
+{
+ p = encode_post_op_attr(rqstp, p, &resp->fh);
+
+ if (resp->status == 0) {
+ /* stupid readdir cookie */
+ memcpy(p, resp->verf, 8); p += 2;
+ xdr_ressize_check(rqstp, p);
+ if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
+ return 1; /*No room for trailer */
+ rqstp->rq_res.page_len = (resp->count) << 2;
+
+ /* add the 'tail' to the end of the 'head' page - page 0. */
+ rqstp->rq_restailpage = 0;
+ rqstp->rq_res.tail[0].iov_base = p;
+ *p++ = 0; /* no more entries */
+ *p++ = htonl(resp->common.err == nfserr_eof);
+ rqstp->rq_res.tail[0].iov_len = 2<<2;
+ return 1;
+ } else
+ return xdr_ressize_check(rqstp, p);
+}
+
+static inline u32 *
+encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
+ int namlen, ino_t ino)
+{
+ *p++ = xdr_one; /* mark entry present */
+ p = xdr_encode_hyper(p, ino); /* file id */
+ p = xdr_encode_array(p, name, namlen);/* name length & name */
+
+ cd->offset = p; /* remember pointer */
+ p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
+
+ return p;
+}
+
+static inline u32 *
+encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
+ struct svc_fh *fhp)
+{
+ p = encode_post_op_attr(cd->rqstp, p, fhp);
+ *p++ = xdr_one; /* yes, a file handle follows */
+ p = encode_fh(p, fhp);
+ fh_put(fhp);
+ return p;
+}
+
+static int
+compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
+ const char *name, int namlen)
+{
+ struct svc_export *exp;
+ struct dentry *dparent, *dchild;
+ int rv = 0;
+
+ dparent = cd->fh.fh_dentry;
+ exp = cd->fh.fh_export;
+
+ fh_init(fhp, NFS3_FHSIZE);
+ if (isdotent(name, namlen)) {
+ if (namlen == 2) {
+ dchild = dget_parent(dparent);
+ if (dchild == dparent) {
+ /* filesystem root - cannot return filehandle for ".." */
+ dput(dchild);
+ return 1;
+ }
+ } else
+ dchild = dget(dparent);
+ } else
+ dchild = lookup_one_len(name, dparent, namlen);
+ if (IS_ERR(dchild))
+ return 1;
+ if (d_mountpoint(dchild) ||
+ fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
+ !dchild->d_inode)
+ rv = 1;
+ dput(dchild);
+ return rv;
+}
+
+/*
+ * Encode a directory entry. This one works for both normal readdir
+ * and readdirplus.
+ * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
+ * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
+ *
+ * The readdirplus baggage is 1+21 words for post_op_attr, plus the
+ * file handle.
+ */
+
+#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
+#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
+static int
+encode_entry(struct readdir_cd *ccd, const char *name,
+ int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
+{
+ struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
+ common);
+ u32 *p = cd->buffer;
+ caddr_t curr_page_addr = NULL;
+ int pn; /* current page number */
+ int slen; /* string (name) length */
+ int elen; /* estimated entry length in words */
+ int num_entry_words = 0; /* actual number of words */
+
+ if (cd->offset) {
+ u64 offset64 = offset;
+
+ if (unlikely(cd->offset1)) {
+ /* we ended up with offset on a page boundary */
+ *cd->offset = htonl(offset64 >> 32);
+ *cd->offset1 = htonl(offset64 & 0xffffffff);
+ cd->offset1 = NULL;
+ } else {
+ xdr_encode_hyper(cd->offset, (u64) offset);
+ }
+ }
+
+ /*
+ dprintk("encode_entry(%.*s @%ld%s)\n",
+ namlen, name, (long) offset, plus? " plus" : "");
+ */
+
+ /* truncate filename if too long */
+ if (namlen > NFS3_MAXNAMLEN)
+ namlen = NFS3_MAXNAMLEN;
+
+ slen = XDR_QUADLEN(namlen);
+ elen = slen + NFS3_ENTRY_BAGGAGE
+ + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
+
+ if (cd->buflen < elen) {
+ cd->common.err = nfserr_toosmall;
+ return -EINVAL;
+ }
+
+ /* determine which page in rq_respages[] we are currently filling */
+ for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
+ curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
+
+ if (((caddr_t)cd->buffer >= curr_page_addr) &&
+ ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
+ break;
+ }
+
+ if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
+ /* encode entry in current page */
+
+ p = encode_entry_baggage(cd, p, name, namlen, ino);
+
+ /* throw in readdirplus baggage */
+ if (plus) {
+ struct svc_fh fh;
+
+ if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
+ *p++ = 0;
+ *p++ = 0;
+ } else
+ p = encode_entryplus_baggage(cd, p, &fh);
+ }
+ num_entry_words = p - cd->buffer;
+ } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
+ /* temporarily encode entry into next page, then move back to
+ * current and next page in rq_respages[] */
+ u32 *p1, *tmp;
+ int len1, len2;
+
+ /* grab next page for temporary storage of entry */
+ p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
+
+ p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
+
+ /* throw in readdirplus baggage */
+ if (plus) {
+ struct svc_fh fh;
+
+ if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
+ /* zero out the filehandle */
+ *p1++ = 0;
+ *p1++ = 0;
+ } else
+ p1 = encode_entryplus_baggage(cd, p1, &fh);
+ }
+
+ /* determine entry word length and lengths to go in pages */
+ num_entry_words = p1 - tmp;
+ len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
+ if ((num_entry_words << 2) < len1) {
+ /* the actual number of words in the entry is less
+ * than elen and can still fit in the current page
+ */
+ memmove(p, tmp, num_entry_words << 2);
+ p += num_entry_words;
+
+ /* update offset */
+ cd->offset = cd->buffer + (cd->offset - tmp);
+ } else {
+ unsigned int offset_r = (cd->offset - tmp) << 2;
+
+ /* update pointer to offset location.
+ * This is a 64bit quantity, so we need to
+ * deal with 3 cases:
+ * - entirely in first page
+ * - entirely in second page
+ * - 4 bytes in each page
+ */
+ if (offset_r + 8 <= len1) {
+ cd->offset = p + (cd->offset - tmp);
+ } else if (offset_r >= len1) {
+ cd->offset -= len1 >> 2;
+ } else {
+ /* sitting on the fence */
+ BUG_ON(offset_r != len1 - 4);
+ cd->offset = p + (cd->offset - tmp);
+ cd->offset1 = tmp;
+ }
+
+ len2 = (num_entry_words << 2) - len1;
+
+ /* move from temp page to current and next pages */
+ memmove(p, tmp, len1);
+ memmove(tmp, (caddr_t)tmp+len1, len2);
+
+ p = tmp + (len2 >> 2);
+ }
+ }
+ else {
+ cd->common.err = nfserr_toosmall;
+ return -EINVAL;
+ }
+
+ cd->buflen -= num_entry_words;
+ cd->buffer = p;
+ cd->common.err = nfs_ok;
+ return 0;
+
+}
+
+int
+nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
+ int namlen, loff_t offset, ino_t ino, unsigned int d_type)
+{
+ return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
+}
+
+int
+nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
+ int namlen, loff_t offset, ino_t ino, unsigned int d_type)
+{
+ return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
+}
+
+/* FSSTAT */
+int
+nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_fsstatres *resp)
+{
+ struct kstatfs *s = &resp->stats;
+ u64 bs = s->f_bsize;
+
+ *p++ = xdr_zero; /* no post_op_attr */
+
+ if (resp->status == 0) {
+ p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
+ p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
+ p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
+ p = xdr_encode_hyper(p, s->f_files); /* total inodes */
+ p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
+ p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
+ *p++ = htonl(resp->invarsec); /* mean unchanged time */
+ }
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* FSINFO */
+int
+nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_fsinfores *resp)
+{
+ *p++ = xdr_zero; /* no post_op_attr */
+
+ if (resp->status == 0) {
+ *p++ = htonl(resp->f_rtmax);
+ *p++ = htonl(resp->f_rtpref);
+ *p++ = htonl(resp->f_rtmult);
+ *p++ = htonl(resp->f_wtmax);
+ *p++ = htonl(resp->f_wtpref);
+ *p++ = htonl(resp->f_wtmult);
+ *p++ = htonl(resp->f_dtpref);
+ p = xdr_encode_hyper(p, resp->f_maxfilesize);
+ *p++ = xdr_one;
+ *p++ = xdr_zero;
+ *p++ = htonl(resp->f_properties);
+ }
+
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* PATHCONF */
+int
+nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_pathconfres *resp)
+{
+ *p++ = xdr_zero; /* no post_op_attr */
+
+ if (resp->status == 0) {
+ *p++ = htonl(resp->p_link_max);
+ *p++ = htonl(resp->p_name_max);
+ *p++ = htonl(resp->p_no_trunc);
+ *p++ = htonl(resp->p_chown_restricted);
+ *p++ = htonl(resp->p_case_insensitive);
+ *p++ = htonl(resp->p_case_preserving);
+ }
+
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* COMMIT */
+int
+nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_commitres *resp)
+{
+ p = encode_wcc_data(rqstp, p, &resp->fh);
+ /* Write verifier */
+ if (resp->status == 0) {
+ *p++ = htonl(nfssvc_boot.tv_sec);
+ *p++ = htonl(nfssvc_boot.tv_usec);
+ }
+ return xdr_ressize_check(rqstp, p);
+}
+
+/*
+ * XDR release functions
+ */
+int
+nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_attrstat *resp)
+{
+ fh_put(&resp->fh);
+ return 1;
+}
+
+int
+nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
+ struct nfsd3_fhandle_pair *resp)
+{
+ fh_put(&resp->fh1);
+ fh_put(&resp->fh2);
+ return 1;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 15:57:13 +0000