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-rw-r--r--fs/nfsd/nfs3xdr.c1152
1 files changed, 1152 insertions, 0 deletions
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
new file mode 100644
index 000000000..b90bea1c4
--- /dev/null
+++ b/fs/nfsd/nfs3xdr.c
@@ -0,0 +1,1152 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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/namei.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include "xdr3.h"
+#include "auth.h"
+#include "netns.h"
+#include "vfs.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_XDR
+
+
+/*
+ * 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 __be32 *
+encode_time3(__be32 *p, struct timespec *time)
+{
+ *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
+ return p;
+}
+
+static __be32 *
+decode_time3(__be32 *p, struct timespec *time)
+{
+ time->tv_sec = ntohl(*p++);
+ time->tv_nsec = ntohl(*p++);
+ return p;
+}
+
+static __be32 *
+decode_fh(__be32 *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);
+}
+
+/* Helper function for NFSv3 ACL code */
+__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
+{
+ return decode_fh(p, fhp);
+}
+
+static __be32 *
+encode_fh(__be32 *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 __be32 *
+decode_filename(__be32 *p, char **namp, unsigned int *lenp)
+{
+ char *name;
+ unsigned 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 __be32 *
+decode_sattr3(__be32 *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_uid = make_kuid(&init_user_ns, ntohl(*p++));
+ if (uid_valid(iap->ia_uid))
+ iap->ia_valid |= ATTR_UID;
+ }
+ if (*p++) {
+ iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
+ if (gid_valid(iap->ia_gid))
+ iap->ia_valid |= ATTR_GID;
+ }
+ if (*p++) {
+ u64 newsize;
+
+ iap->ia_valid |= ATTR_SIZE;
+ p = xdr_decode_hyper(p, &newsize);
+ iap->ia_size = min_t(u64, newsize, 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 __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
+{
+ u64 f;
+ switch(fsid_source(fhp)) {
+ default:
+ case FSIDSOURCE_DEV:
+ p = xdr_encode_hyper(p, (u64)huge_encode_dev
+ (fhp->fh_dentry->d_sb->s_dev));
+ break;
+ case FSIDSOURCE_FSID:
+ p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
+ break;
+ case FSIDSOURCE_UUID:
+ f = ((u64*)fhp->fh_export->ex_uuid)[0];
+ f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
+ p = xdr_encode_hyper(p, f);
+ break;
+ }
+ return p;
+}
+
+static __be32 *
+encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
+ struct kstat *stat)
+{
+ struct timespec ts;
+ *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
+ *p++ = htonl((u32) (stat->mode & S_IALLUGO));
+ *p++ = htonl((u32) stat->nlink);
+ *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
+ *p++ = htonl((u32) from_kgid(&init_user_ns, 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));
+ p = encode_fsid(p, fhp);
+ p = xdr_encode_hyper(p, stat->ino);
+ ts = timespec64_to_timespec(stat->atime);
+ p = encode_time3(p, &ts);
+ ts = timespec64_to_timespec(stat->mtime);
+ p = encode_time3(p, &ts);
+ ts = timespec64_to_timespec(stat->ctime);
+ p = encode_time3(p, &ts);
+
+ return p;
+}
+
+static __be32 *
+encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+ /* Attributes to follow */
+ *p++ = xdr_one;
+ return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
+}
+
+/*
+ * 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 __be32 *
+encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+ struct dentry *dentry = fhp->fh_dentry;
+ if (dentry && d_really_is_positive(dentry)) {
+ __be32 err;
+ struct kstat stat;
+
+ err = fh_getattr(fhp, &stat);
+ if (!err) {
+ *p++ = xdr_one; /* attributes follow */
+ lease_get_mtime(d_inode(dentry), &stat.mtime);
+ return encode_fattr3(rqstp, p, fhp, &stat);
+ }
+ }
+ *p++ = xdr_zero;
+ return p;
+}
+
+/* Helper for NFSv3 ACLs */
+__be32 *
+nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+ return encode_post_op_attr(rqstp, p, fhp);
+}
+
+/*
+ * Enocde weak cache consistency data
+ */
+static __be32 *
+encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+{
+ struct dentry *dentry = fhp->fh_dentry;
+
+ if (dentry && d_really_is_positive(dentry) && 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);
+}
+
+/*
+ * Fill in the pre_op attr for the wcc data
+ */
+void fill_pre_wcc(struct svc_fh *fhp)
+{
+ struct inode *inode;
+ struct kstat stat;
+ __be32 err;
+
+ if (fhp->fh_pre_saved)
+ return;
+
+ inode = d_inode(fhp->fh_dentry);
+ err = fh_getattr(fhp, &stat);
+ if (err) {
+ /* Grab the times from inode anyway */
+ stat.mtime = inode->i_mtime;
+ stat.ctime = inode->i_ctime;
+ stat.size = inode->i_size;
+ }
+
+ fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
+ fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
+ fhp->fh_pre_size = stat.size;
+ fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
+ fhp->fh_pre_saved = true;
+}
+
+/*
+ * Fill in the post_op attr for the wcc data
+ */
+void fill_post_wcc(struct svc_fh *fhp)
+{
+ __be32 err;
+
+ if (fhp->fh_post_saved)
+ printk("nfsd: inode locked twice during operation.\n");
+
+ err = fh_getattr(fhp, &fhp->fh_post_attr);
+ fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
+ d_inode(fhp->fh_dentry));
+ if (err) {
+ fhp->fh_post_saved = false;
+ /* Grab the ctime anyway - set_change_info might use it */
+ fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
+ } else
+ fhp->fh_post_saved = true;
+}
+
+/*
+ * XDR decode functions
+ */
+int
+nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd_fhandle *args = rqstp->rq_argp;
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_sattrargs *args = rqstp->rq_argp;
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ p = decode_sattr3(p, &args->attrs);
+
+ 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, __be32 *p)
+{
+ struct nfsd3_diropargs *args = rqstp->rq_argp;
+
+ 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, __be32 *p)
+{
+ struct nfsd3_accessargs *args = rqstp->rq_argp;
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ args->access = ntohl(*p++);
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_readargs *args = rqstp->rq_argp;
+ unsigned int len;
+ int v;
+ u32 max_blocksize = svc_max_payload(rqstp);
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ p = xdr_decode_hyper(p, &args->offset);
+
+ args->count = ntohl(*p++);
+ len = min(args->count, max_blocksize);
+
+ /* set up the kvec */
+ v=0;
+ while (len > 0) {
+ struct page *p = *(rqstp->rq_next_page++);
+
+ rqstp->rq_vec[v].iov_base = page_address(p);
+ rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
+ len -= rqstp->rq_vec[v].iov_len;
+ v++;
+ }
+ args->vlen = v;
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_writeargs *args = rqstp->rq_argp;
+ unsigned int len, hdr, dlen;
+ u32 max_blocksize = svc_max_payload(rqstp);
+ struct kvec *head = rqstp->rq_arg.head;
+ struct kvec *tail = rqstp->rq_arg.tail;
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ p = xdr_decode_hyper(p, &args->offset);
+
+ args->count = ntohl(*p++);
+ args->stable = ntohl(*p++);
+ len = args->len = ntohl(*p++);
+ if ((void *)p > head->iov_base + head->iov_len)
+ return 0;
+ /*
+ * The count must equal the amount of data passed.
+ */
+ if (args->count != args->len)
+ return 0;
+
+ /*
+ * Check to make sure that we got the right number of
+ * bytes.
+ */
+ hdr = (void*)p - head->iov_base;
+ dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
+ /*
+ * Round the length of the data which was specified up to
+ * the next multiple of XDR units and then compare that
+ * against the length which was actually received.
+ * Note that when RPCSEC/GSS (for example) is used, the
+ * data buffer can be padded so dlen might be larger
+ * than required. It must never be smaller.
+ */
+ if (dlen < XDR_QUADLEN(len)*4)
+ return 0;
+
+ if (args->count > max_blocksize) {
+ args->count = max_blocksize;
+ len = args->len = max_blocksize;
+ }
+
+ args->first.iov_base = (void *)p;
+ args->first.iov_len = head->iov_len - hdr;
+ return 1;
+}
+
+int
+nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_createargs *args = rqstp->rq_argp;
+
+ 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:
+ p = decode_sattr3(p, &args->attrs);
+ 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, __be32 *p)
+{
+ struct nfsd3_createargs *args = rqstp->rq_argp;
+
+ if (!(p = decode_fh(p, &args->fh)) ||
+ !(p = decode_filename(p, &args->name, &args->len)))
+ return 0;
+ p = decode_sattr3(p, &args->attrs);
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_symlinkargs *args = rqstp->rq_argp;
+ char *base = (char *)p;
+ size_t dlen;
+
+ if (!(p = decode_fh(p, &args->ffh)) ||
+ !(p = decode_filename(p, &args->fname, &args->flen)))
+ return 0;
+ p = decode_sattr3(p, &args->attrs);
+
+ args->tlen = ntohl(*p++);
+
+ args->first.iov_base = p;
+ args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
+ args->first.iov_len -= (char *)p - base;
+
+ dlen = args->first.iov_len + rqstp->rq_arg.page_len +
+ rqstp->rq_arg.tail[0].iov_len;
+ if (dlen < XDR_QUADLEN(args->tlen) << 2)
+ return 0;
+ return 1;
+}
+
+int
+nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_mknodargs *args = rqstp->rq_argp;
+
+ 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)
+ p = decode_sattr3(p, &args->attrs);
+
+ 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, __be32 *p)
+{
+ struct nfsd3_renameargs *args = rqstp->rq_argp;
+
+ 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, __be32 *p)
+{
+ struct nfsd3_readlinkargs *args = rqstp->rq_argp;
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ args->buffer = page_address(*(rqstp->rq_next_page++));
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_linkargs *args = rqstp->rq_argp;
+
+ 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, __be32 *p)
+{
+ struct nfsd3_readdirargs *args = rqstp->rq_argp;
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ return 0;
+ p = xdr_decode_hyper(p, &args->cookie);
+ args->verf = p; p += 2;
+ args->dircount = ~0;
+ args->count = ntohl(*p++);
+ args->count = min_t(u32, args->count, PAGE_SIZE);
+ args->buffer = page_address(*(rqstp->rq_next_page++));
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_readdirargs *args = rqstp->rq_argp;
+ int len;
+ u32 max_blocksize = svc_max_payload(rqstp);
+
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ 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 = min(args->count, max_blocksize);
+ while (len > 0) {
+ struct page *p = *(rqstp->rq_next_page++);
+ if (!args->buffer)
+ args->buffer = page_address(p);
+ len -= PAGE_SIZE;
+ }
+
+ return xdr_argsize_check(rqstp, p);
+}
+
+int
+nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_commitargs *args = rqstp->rq_argp;
+ p = decode_fh(p, &args->fh);
+ if (!p)
+ 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, __be32 *p)
+{
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* GETATTR */
+int
+nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+ if (resp->status == 0) {
+ lease_get_mtime(d_inode(resp->fh.fh_dentry),
+ &resp->stat.mtime);
+ p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
+ }
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* SETATTR, REMOVE, RMDIR */
+int
+nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+ p = encode_wcc_data(rqstp, p, &resp->fh);
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* LOOKUP */
+int
+nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_diropres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_accessres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_readlinkres *resp = rqstp->rq_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_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, __be32 *p)
+{
+ struct nfsd3_readres *resp = rqstp->rq_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 as well */
+ rqstp->rq_res.page_len = resp->count;
+ if (resp->count & 3) {
+ /* need to pad the tail */
+ 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, __be32 *p)
+{
+ struct nfsd3_writeres *resp = rqstp->rq_resp;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ p = encode_wcc_data(rqstp, p, &resp->fh);
+ if (resp->status == 0) {
+ *p++ = htonl(resp->count);
+ *p++ = htonl(resp->committed);
+ /* unique identifier, y2038 overflow can be ignored */
+ *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
+ *p++ = htonl(nn->nfssvc_boot.tv_nsec);
+ }
+ return xdr_ressize_check(rqstp, p);
+}
+
+/* CREATE, MKDIR, SYMLINK, MKNOD */
+int
+nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
+{
+ struct nfsd3_diropres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_renameres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_linkres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_readdirres *resp = rqstp->rq_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_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 __be32 *
+encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
+ int namlen, u64 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 __be32
+compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
+ const char *name, int namlen, u64 ino)
+{
+ struct svc_export *exp;
+ struct dentry *dparent, *dchild;
+ __be32 rv = nfserr_noent;
+
+ dparent = cd->fh.fh_dentry;
+ exp = cd->fh.fh_export;
+
+ if (isdotent(name, namlen)) {
+ if (namlen == 2) {
+ dchild = dget_parent(dparent);
+ /*
+ * Don't return filehandle for ".." if we're at
+ * the filesystem or export root:
+ */
+ if (dchild == dparent)
+ goto out;
+ if (dparent == exp->ex_path.dentry)
+ goto out;
+ } else
+ dchild = dget(dparent);
+ } else
+ dchild = lookup_one_len_unlocked(name, dparent, namlen);
+ if (IS_ERR(dchild))
+ return rv;
+ if (d_mountpoint(dchild))
+ goto out;
+ if (d_really_is_negative(dchild))
+ goto out;
+ if (dchild->d_inode->i_ino != ino)
+ goto out;
+ rv = fh_compose(fhp, exp, dchild, &cd->fh);
+out:
+ dput(dchild);
+ return rv;
+}
+
+static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
+{
+ struct svc_fh *fh = &cd->scratch;
+ __be32 err;
+
+ fh_init(fh, NFS3_FHSIZE);
+ err = compose_entry_fh(cd, fh, name, namlen, ino);
+ if (err) {
+ *p++ = 0;
+ *p++ = 0;
+ goto out;
+ }
+ p = encode_post_op_attr(cd->rqstp, p, fh);
+ *p++ = xdr_one; /* yes, a file handle follows */
+ p = encode_fh(p, fh);
+out:
+ fh_put(fh);
+ return p;
+}
+
+/*
+ * 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,
+ loff_t offset, u64 ino, unsigned int d_type, int plus)
+{
+ struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
+ common);
+ __be32 *p = cd->buffer;
+ caddr_t curr_page_addr = NULL;
+ struct page ** page;
+ 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, offset64);
+ }
+ cd->offset = NULL;
+ }
+
+ /*
+ dprintk("encode_entry(%.*s @%ld%s)\n",
+ namlen, name, (long) offset, plus? " plus" : "");
+ */
+
+ /* truncate filename if too long */
+ namlen = min(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 (page = cd->rqstp->rq_respages + 1;
+ page < cd->rqstp->rq_next_page; page++) {
+ curr_page_addr = page_address(*page);
+
+ 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);
+
+ if (plus)
+ p = encode_entryplus_baggage(cd, p, name, namlen, ino);
+ num_entry_words = p - cd->buffer;
+ } else if (*(page+1) != NULL) {
+ /* temporarily encode entry into next page, then move back to
+ * current and next page in rq_respages[] */
+ __be32 *p1, *tmp;
+ int len1, len2;
+
+ /* grab next page for temporary storage of entry */
+ p1 = tmp = page_address(*(page+1));
+
+ p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
+
+ if (plus)
+ p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
+
+ /* 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(void *cd, const char *name,
+ int namlen, loff_t offset, u64 ino, unsigned int d_type)
+{
+ return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
+}
+
+int
+nfs3svc_encode_entry_plus(void *cd, const char *name,
+ int namlen, loff_t offset, u64 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, __be32 *p)
+{
+ struct nfsd3_fsstatres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_fsinfores *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_pathconfres *resp = rqstp->rq_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, __be32 *p)
+{
+ struct nfsd3_commitres *resp = rqstp->rq_resp;
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+
+ p = encode_wcc_data(rqstp, p, &resp->fh);
+ /* Write verifier */
+ if (resp->status == 0) {
+ /* unique identifier, y2038 overflow can be ignored */
+ *p++ = htonl((u32)nn->nfssvc_boot.tv_sec);
+ *p++ = htonl(nn->nfssvc_boot.tv_nsec);
+ }
+ return xdr_ressize_check(rqstp, p);
+}
+
+/*
+ * XDR release functions
+ */
+void
+nfs3svc_release_fhandle(struct svc_rqst *rqstp)
+{
+ struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+ fh_put(&resp->fh);
+}
+
+void
+nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
+{
+ struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
+
+ fh_put(&resp->fh1);
+ fh_put(&resp->fh2);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 07:52:56 +0000