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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/nfsd/nfs3xdr.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/nfsd/nfs3xdr.c')
-rw-r--r--fs/nfsd/nfs3xdr.c1357
1 files changed, 1357 insertions, 0 deletions
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
new file mode 100644
index 0000000000..f32128955e
--- /dev/null
+++ b/fs/nfsd/nfs3xdr.c
@@ -0,0 +1,1357 @@
+// 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"
+
+/*
+ * Force construction of an empty post-op attr
+ */
+static const struct svc_fh nfs3svc_null_fh = {
+ .fh_no_wcc = true,
+};
+
+/*
+ * time_delta. {1, 0} means the server is accurate only
+ * to the nearest second.
+ */
+static const struct timespec64 nfs3svc_time_delta = {
+ .tv_sec = 1,
+ .tv_nsec = 0,
+};
+
+/*
+ * Mapping of S_IF* types to NFS file types
+ */
+static const u32 nfs3_ftypes[] = {
+ NF3NON, NF3FIFO, NF3CHR, NF3BAD,
+ NF3DIR, NF3BAD, NF3BLK, NF3BAD,
+ NF3REG, NF3BAD, NF3LNK, NF3BAD,
+ NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
+};
+
+
+/*
+ * Basic NFSv3 data types (RFC 1813 Sections 2.5 and 2.6)
+ */
+
+static __be32 *
+encode_nfstime3(__be32 *p, const struct timespec64 *time)
+{
+ *p++ = cpu_to_be32((u32)time->tv_sec);
+ *p++ = cpu_to_be32(time->tv_nsec);
+
+ return p;
+}
+
+static bool
+svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, XDR_UNIT * 2);
+ if (!p)
+ return false;
+ timep->tv_sec = be32_to_cpup(p++);
+ timep->tv_nsec = be32_to_cpup(p);
+
+ return true;
+}
+
+/**
+ * svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle
+ * @xdr: XDR stream positioned at an undecoded NFSv3 FH
+ * @fhp: OUT: filled-in server file handle
+ *
+ * Return values:
+ * %false: The encoded file handle was not valid
+ * %true: @fhp has been initialized
+ */
+bool
+svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp)
+{
+ __be32 *p;
+ u32 size;
+
+ if (xdr_stream_decode_u32(xdr, &size) < 0)
+ return false;
+ if (size == 0 || size > NFS3_FHSIZE)
+ return false;
+ p = xdr_inline_decode(xdr, size);
+ if (!p)
+ return false;
+ fh_init(fhp, NFS3_FHSIZE);
+ fhp->fh_handle.fh_size = size;
+ memcpy(&fhp->fh_handle.fh_raw, p, size);
+
+ return true;
+}
+
+/**
+ * svcxdr_encode_nfsstat3 - Encode an NFSv3 status code
+ * @xdr: XDR stream
+ * @status: status value to encode
+ *
+ * Return values:
+ * %false: Send buffer space was exhausted
+ * %true: Success
+ */
+bool
+svcxdr_encode_nfsstat3(struct xdr_stream *xdr, __be32 status)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, sizeof(status));
+ if (!p)
+ return false;
+ *p = status;
+
+ return true;
+}
+
+static bool
+svcxdr_encode_nfs_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp)
+{
+ u32 size = fhp->fh_handle.fh_size;
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, XDR_UNIT + size);
+ if (!p)
+ return false;
+ *p++ = cpu_to_be32(size);
+ if (size)
+ p[XDR_QUADLEN(size) - 1] = 0;
+ memcpy(p, &fhp->fh_handle.fh_raw, size);
+
+ return true;
+}
+
+static bool
+svcxdr_encode_post_op_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp)
+{
+ if (xdr_stream_encode_item_present(xdr) < 0)
+ return false;
+ if (!svcxdr_encode_nfs_fh3(xdr, fhp))
+ return false;
+
+ return true;
+}
+
+static bool
+svcxdr_encode_cookieverf3(struct xdr_stream *xdr, const __be32 *verf)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, NFS3_COOKIEVERFSIZE);
+ if (!p)
+ return false;
+ memcpy(p, verf, NFS3_COOKIEVERFSIZE);
+
+ return true;
+}
+
+static bool
+svcxdr_encode_writeverf3(struct xdr_stream *xdr, const __be32 *verf)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, NFS3_WRITEVERFSIZE);
+ if (!p)
+ return false;
+ memcpy(p, verf, NFS3_WRITEVERFSIZE);
+
+ return true;
+}
+
+static bool
+svcxdr_decode_filename3(struct xdr_stream *xdr, char **name, unsigned int *len)
+{
+ u32 size, i;
+ __be32 *p;
+ char *c;
+
+ if (xdr_stream_decode_u32(xdr, &size) < 0)
+ return false;
+ if (size == 0 || size > NFS3_MAXNAMLEN)
+ return false;
+ p = xdr_inline_decode(xdr, size);
+ if (!p)
+ return false;
+
+ *len = size;
+ *name = (char *)p;
+ for (i = 0, c = *name; i < size; i++, c++) {
+ if (*c == '\0' || *c == '/')
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+svcxdr_decode_diropargs3(struct xdr_stream *xdr, struct svc_fh *fhp,
+ char **name, unsigned int *len)
+{
+ return svcxdr_decode_nfs_fh3(xdr, fhp) &&
+ svcxdr_decode_filename3(xdr, name, len);
+}
+
+static bool
+svcxdr_decode_sattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
+ struct iattr *iap)
+{
+ u32 set_it;
+
+ iap->ia_valid = 0;
+
+ if (xdr_stream_decode_bool(xdr, &set_it) < 0)
+ return false;
+ if (set_it) {
+ u32 mode;
+
+ if (xdr_stream_decode_u32(xdr, &mode) < 0)
+ return false;
+ iap->ia_valid |= ATTR_MODE;
+ iap->ia_mode = mode;
+ }
+ if (xdr_stream_decode_bool(xdr, &set_it) < 0)
+ return false;
+ if (set_it) {
+ u32 uid;
+
+ if (xdr_stream_decode_u32(xdr, &uid) < 0)
+ return false;
+ iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), uid);
+ if (uid_valid(iap->ia_uid))
+ iap->ia_valid |= ATTR_UID;
+ }
+ if (xdr_stream_decode_bool(xdr, &set_it) < 0)
+ return false;
+ if (set_it) {
+ u32 gid;
+
+ if (xdr_stream_decode_u32(xdr, &gid) < 0)
+ return false;
+ iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), gid);
+ if (gid_valid(iap->ia_gid))
+ iap->ia_valid |= ATTR_GID;
+ }
+ if (xdr_stream_decode_bool(xdr, &set_it) < 0)
+ return false;
+ if (set_it) {
+ u64 newsize;
+
+ if (xdr_stream_decode_u64(xdr, &newsize) < 0)
+ return false;
+ iap->ia_valid |= ATTR_SIZE;
+ iap->ia_size = newsize;
+ }
+ if (xdr_stream_decode_u32(xdr, &set_it) < 0)
+ return false;
+ switch (set_it) {
+ case DONT_CHANGE:
+ break;
+ case SET_TO_SERVER_TIME:
+ iap->ia_valid |= ATTR_ATIME;
+ break;
+ case SET_TO_CLIENT_TIME:
+ if (!svcxdr_decode_nfstime3(xdr, &iap->ia_atime))
+ return false;
+ iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
+ break;
+ default:
+ return false;
+ }
+ if (xdr_stream_decode_u32(xdr, &set_it) < 0)
+ return false;
+ switch (set_it) {
+ case DONT_CHANGE:
+ break;
+ case SET_TO_SERVER_TIME:
+ iap->ia_valid |= ATTR_MTIME;
+ break;
+ case SET_TO_CLIENT_TIME:
+ if (!svcxdr_decode_nfstime3(xdr, &iap->ia_mtime))
+ return false;
+ iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
+{
+ __be32 *p;
+ u32 check;
+
+ if (xdr_stream_decode_bool(xdr, &check) < 0)
+ return false;
+ if (check) {
+ p = xdr_inline_decode(xdr, XDR_UNIT * 2);
+ if (!p)
+ return false;
+ args->check_guard = 1;
+ args->guardtime = be32_to_cpup(p);
+ } else
+ args->check_guard = 0;
+
+ return true;
+}
+
+static bool
+svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args)
+{
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, XDR_UNIT * 2);
+ if (!p)
+ return false;
+ args->major = be32_to_cpup(p++);
+ args->minor = be32_to_cpup(p);
+
+ return true;
+}
+
+static bool
+svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
+ struct nfsd3_mknodargs *args)
+{
+ return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
+ svcxdr_decode_specdata3(xdr, args);
+}
+
+static bool
+svcxdr_encode_fattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
+ const struct svc_fh *fhp, const struct kstat *stat)
+{
+ struct user_namespace *userns = nfsd_user_namespace(rqstp);
+ __be32 *p;
+ u64 fsid;
+
+ p = xdr_reserve_space(xdr, XDR_UNIT * 21);
+ if (!p)
+ return false;
+
+ *p++ = cpu_to_be32(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
+ *p++ = cpu_to_be32((u32)(stat->mode & S_IALLUGO));
+ *p++ = cpu_to_be32((u32)stat->nlink);
+ *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
+ *p++ = cpu_to_be32((u32)from_kgid_munged(userns, 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);
+
+ /* used */
+ p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
+
+ /* rdev */
+ *p++ = cpu_to_be32((u32)MAJOR(stat->rdev));
+ *p++ = cpu_to_be32((u32)MINOR(stat->rdev));
+
+ switch(fsid_source(fhp)) {
+ case FSIDSOURCE_FSID:
+ fsid = (u64)fhp->fh_export->ex_fsid;
+ break;
+ case FSIDSOURCE_UUID:
+ fsid = ((u64 *)fhp->fh_export->ex_uuid)[0];
+ fsid ^= ((u64 *)fhp->fh_export->ex_uuid)[1];
+ break;
+ default:
+ fsid = (u64)huge_encode_dev(fhp->fh_dentry->d_sb->s_dev);
+ }
+ p = xdr_encode_hyper(p, fsid);
+
+ /* fileid */
+ p = xdr_encode_hyper(p, stat->ino);
+
+ p = encode_nfstime3(p, &stat->atime);
+ p = encode_nfstime3(p, &stat->mtime);
+ encode_nfstime3(p, &stat->ctime);
+
+ return true;
+}
+
+static bool
+svcxdr_encode_wcc_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, XDR_UNIT * 6);
+ if (!p)
+ return false;
+ p = xdr_encode_hyper(p, (u64)fhp->fh_pre_size);
+ p = encode_nfstime3(p, &fhp->fh_pre_mtime);
+ encode_nfstime3(p, &fhp->fh_pre_ctime);
+
+ return true;
+}
+
+static bool
+svcxdr_encode_pre_op_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
+{
+ if (!fhp->fh_pre_saved) {
+ if (xdr_stream_encode_item_absent(xdr) < 0)
+ return false;
+ return true;
+ }
+
+ if (xdr_stream_encode_item_present(xdr) < 0)
+ return false;
+ return svcxdr_encode_wcc_attr(xdr, fhp);
+}
+
+/**
+ * svcxdr_encode_post_op_attr - Encode NFSv3 post-op attributes
+ * @rqstp: Context of a completed RPC transaction
+ * @xdr: XDR stream
+ * @fhp: File handle to encode
+ *
+ * Return values:
+ * %false: Send buffer space was exhausted
+ * %true: Success
+ */
+bool
+svcxdr_encode_post_op_attr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
+ const struct svc_fh *fhp)
+{
+ struct dentry *dentry = fhp->fh_dentry;
+ struct kstat stat;
+
+ /*
+ * The inode may be NULL if the call failed because of a
+ * stale file handle. In this case, no attributes are
+ * returned.
+ */
+ if (fhp->fh_no_wcc || !dentry || !d_really_is_positive(dentry))
+ goto no_post_op_attrs;
+ if (fh_getattr(fhp, &stat) != nfs_ok)
+ goto no_post_op_attrs;
+
+ if (xdr_stream_encode_item_present(xdr) < 0)
+ return false;
+ lease_get_mtime(d_inode(dentry), &stat.mtime);
+ if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &stat))
+ return false;
+
+ return true;
+
+no_post_op_attrs:
+ return xdr_stream_encode_item_absent(xdr) > 0;
+}
+
+/*
+ * Encode weak cache consistency data
+ */
+static bool
+svcxdr_encode_wcc_data(struct svc_rqst *rqstp, struct xdr_stream *xdr,
+ const struct svc_fh *fhp)
+{
+ struct dentry *dentry = fhp->fh_dentry;
+
+ if (!dentry || !d_really_is_positive(dentry) || !fhp->fh_post_saved)
+ goto neither;
+
+ /* before */
+ if (!svcxdr_encode_pre_op_attr(xdr, fhp))
+ return false;
+
+ /* after */
+ if (xdr_stream_encode_item_present(xdr) < 0)
+ return false;
+ if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &fhp->fh_post_attr))
+ return false;
+
+ return true;
+
+neither:
+ if (xdr_stream_encode_item_absent(xdr) < 0)
+ return false;
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp))
+ return false;
+
+ return true;
+}
+
+/*
+ * XDR decode functions
+ */
+
+bool
+nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd_fhandle *args = rqstp->rq_argp;
+
+ return svcxdr_decode_nfs_fh3(xdr, &args->fh);
+}
+
+bool
+nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_sattrargs *args = rqstp->rq_argp;
+
+ return svcxdr_decode_nfs_fh3(xdr, &args->fh) &&
+ svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
+ svcxdr_decode_sattrguard3(xdr, args);
+}
+
+bool
+nfs3svc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_diropargs *args = rqstp->rq_argp;
+
+ return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len);
+}
+
+bool
+nfs3svc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_accessargs *args = rqstp->rq_argp;
+
+ if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->access) < 0)
+ return false;
+
+ return true;
+}
+
+bool
+nfs3svc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_readargs *args = rqstp->rq_argp;
+
+ if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+ return false;
+ if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->count) < 0)
+ return false;
+
+ return true;
+}
+
+bool
+nfs3svc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_writeargs *args = rqstp->rq_argp;
+ u32 max_blocksize = svc_max_payload(rqstp);
+
+ if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+ return false;
+ if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->count) < 0)
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->stable) < 0)
+ return false;
+
+ /* opaque data */
+ if (xdr_stream_decode_u32(xdr, &args->len) < 0)
+ return false;
+
+ /* request sanity */
+ if (args->count != args->len)
+ return false;
+ if (args->count > max_blocksize) {
+ args->count = max_blocksize;
+ args->len = max_blocksize;
+ }
+
+ return xdr_stream_subsegment(xdr, &args->payload, args->count);
+}
+
+bool
+nfs3svc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_createargs *args = rqstp->rq_argp;
+
+ if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->createmode) < 0)
+ return false;
+ switch (args->createmode) {
+ case NFS3_CREATE_UNCHECKED:
+ case NFS3_CREATE_GUARDED:
+ return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
+ case NFS3_CREATE_EXCLUSIVE:
+ args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE);
+ if (!args->verf)
+ return false;
+ break;
+ default:
+ return false;
+ }
+ return true;
+}
+
+bool
+nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_createargs *args = rqstp->rq_argp;
+
+ return svcxdr_decode_diropargs3(xdr, &args->fh,
+ &args->name, &args->len) &&
+ svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
+}
+
+bool
+nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_symlinkargs *args = rqstp->rq_argp;
+ struct kvec *head = rqstp->rq_arg.head;
+
+ if (!svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen))
+ return false;
+ if (!svcxdr_decode_sattr3(rqstp, xdr, &args->attrs))
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
+ return false;
+
+ /* symlink_data */
+ args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
+ args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
+ return args->first.iov_base != NULL;
+}
+
+bool
+nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_mknodargs *args = rqstp->rq_argp;
+
+ if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->ftype) < 0)
+ return false;
+ switch (args->ftype) {
+ case NF3CHR:
+ case NF3BLK:
+ return svcxdr_decode_devicedata3(rqstp, xdr, args);
+ case NF3SOCK:
+ case NF3FIFO:
+ return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
+ case NF3REG:
+ case NF3DIR:
+ case NF3LNK:
+ /* Valid XDR but illegal file types */
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+bool
+nfs3svc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_renameargs *args = rqstp->rq_argp;
+
+ return svcxdr_decode_diropargs3(xdr, &args->ffh,
+ &args->fname, &args->flen) &&
+ svcxdr_decode_diropargs3(xdr, &args->tfh,
+ &args->tname, &args->tlen);
+}
+
+bool
+nfs3svc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_linkargs *args = rqstp->rq_argp;
+
+ return svcxdr_decode_nfs_fh3(xdr, &args->ffh) &&
+ svcxdr_decode_diropargs3(xdr, &args->tfh,
+ &args->tname, &args->tlen);
+}
+
+bool
+nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_readdirargs *args = rqstp->rq_argp;
+
+ if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+ return false;
+ if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
+ return false;
+ args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
+ if (!args->verf)
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->count) < 0)
+ return false;
+
+ return true;
+}
+
+bool
+nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_readdirargs *args = rqstp->rq_argp;
+ u32 dircount;
+
+ if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+ return false;
+ if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
+ return false;
+ args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
+ if (!args->verf)
+ return false;
+ /* dircount is ignored */
+ if (xdr_stream_decode_u32(xdr, &dircount) < 0)
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->count) < 0)
+ return false;
+
+ return true;
+}
+
+bool
+nfs3svc_decode_commitargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_commitargs *args = rqstp->rq_argp;
+
+ if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
+ return false;
+ if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
+ return false;
+ if (xdr_stream_decode_u32(xdr, &args->count) < 0)
+ return false;
+
+ return true;
+}
+
+/*
+ * XDR encode functions
+ */
+
+/* GETATTR */
+bool
+nfs3svc_encode_getattrres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ lease_get_mtime(d_inode(resp->fh.fh_dentry), &resp->stat.mtime);
+ if (!svcxdr_encode_fattr3(rqstp, xdr, &resp->fh, &resp->stat))
+ return false;
+ break;
+ }
+
+ return true;
+}
+
+/* SETATTR, REMOVE, RMDIR */
+bool
+nfs3svc_encode_wccstat(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_attrstat *resp = rqstp->rq_resp;
+
+ return svcxdr_encode_nfsstat3(xdr, resp->status) &&
+ svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh);
+}
+
+/* LOOKUP */
+bool
+nfs3svc_encode_lookupres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_diropres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_nfs_fh3(xdr, &resp->fh))
+ return false;
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
+ return false;
+ }
+
+ return true;
+}
+
+/* ACCESS */
+bool
+nfs3svc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_accessres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ if (xdr_stream_encode_u32(xdr, resp->access) < 0)
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ }
+
+ return true;
+}
+
+/* READLINK */
+bool
+nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_readlinkres *resp = rqstp->rq_resp;
+ struct kvec *head = rqstp->rq_res.head;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ if (xdr_stream_encode_u32(xdr, resp->len) < 0)
+ return false;
+ svcxdr_encode_opaque_pages(rqstp, xdr, resp->pages, 0,
+ resp->len);
+ if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ }
+
+ return true;
+}
+
+/* READ */
+bool
+nfs3svc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_readres *resp = rqstp->rq_resp;
+ struct kvec *head = rqstp->rq_res.head;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ if (xdr_stream_encode_u32(xdr, resp->count) < 0)
+ return false;
+ if (xdr_stream_encode_bool(xdr, resp->eof) < 0)
+ return false;
+ if (xdr_stream_encode_u32(xdr, resp->count) < 0)
+ return false;
+ svcxdr_encode_opaque_pages(rqstp, xdr, resp->pages,
+ rqstp->rq_res.page_base,
+ resp->count);
+ if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ }
+
+ return true;
+}
+
+/* WRITE */
+bool
+nfs3svc_encode_writeres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_writeres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
+ return false;
+ if (xdr_stream_encode_u32(xdr, resp->count) < 0)
+ return false;
+ if (xdr_stream_encode_u32(xdr, resp->committed) < 0)
+ return false;
+ if (!svcxdr_encode_writeverf3(xdr, resp->verf))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
+ return false;
+ }
+
+ return true;
+}
+
+/* CREATE, MKDIR, SYMLINK, MKNOD */
+bool
+nfs3svc_encode_createres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_diropres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_fh3(xdr, &resp->fh))
+ return false;
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
+ return false;
+ }
+
+ return true;
+}
+
+/* RENAME */
+bool
+nfs3svc_encode_renameres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_renameres *resp = rqstp->rq_resp;
+
+ return svcxdr_encode_nfsstat3(xdr, resp->status) &&
+ svcxdr_encode_wcc_data(rqstp, xdr, &resp->ffh) &&
+ svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh);
+}
+
+/* LINK */
+bool
+nfs3svc_encode_linkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_linkres *resp = rqstp->rq_resp;
+
+ return svcxdr_encode_nfsstat3(xdr, resp->status) &&
+ svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh) &&
+ svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh);
+}
+
+/* READDIR */
+bool
+nfs3svc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_readdirres *resp = rqstp->rq_resp;
+ struct xdr_buf *dirlist = &resp->dirlist;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ if (!svcxdr_encode_cookieverf3(xdr, resp->verf))
+ return false;
+ svcxdr_encode_opaque_pages(rqstp, xdr, dirlist->pages, 0,
+ dirlist->len);
+ /* no more entries */
+ if (xdr_stream_encode_item_absent(xdr) < 0)
+ return false;
+ if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
+ return false;
+ }
+
+ return true;
+}
+
+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_positive_unlocked(name, dparent, namlen);
+ if (IS_ERR(dchild))
+ return rv;
+ if (d_mountpoint(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;
+}
+
+/**
+ * nfs3svc_encode_cookie3 - Encode a directory offset cookie
+ * @resp: readdir result context
+ * @offset: offset cookie to encode
+ *
+ * The buffer space for the offset cookie has already been reserved
+ * by svcxdr_encode_entry3_common().
+ */
+void nfs3svc_encode_cookie3(struct nfsd3_readdirres *resp, u64 offset)
+{
+ __be64 cookie = cpu_to_be64(offset);
+
+ if (!resp->cookie_offset)
+ return;
+ write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
+ sizeof(cookie));
+ resp->cookie_offset = 0;
+}
+
+static bool
+svcxdr_encode_entry3_common(struct nfsd3_readdirres *resp, const char *name,
+ int namlen, loff_t offset, u64 ino)
+{
+ struct xdr_buf *dirlist = &resp->dirlist;
+ struct xdr_stream *xdr = &resp->xdr;
+
+ if (xdr_stream_encode_item_present(xdr) < 0)
+ return false;
+ /* fileid */
+ if (xdr_stream_encode_u64(xdr, ino) < 0)
+ return false;
+ /* name */
+ if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS3_MAXNAMLEN)) < 0)
+ return false;
+ /* cookie */
+ resp->cookie_offset = dirlist->len;
+ if (xdr_stream_encode_u64(xdr, OFFSET_MAX) < 0)
+ return false;
+
+ return true;
+}
+
+/**
+ * nfs3svc_encode_entry3 - encode one NFSv3 READDIR entry
+ * @data: directory context
+ * @name: name of the object to be encoded
+ * @namlen: length of that name, in bytes
+ * @offset: the offset of the previous entry
+ * @ino: the fileid of this entry
+ * @d_type: unused
+ *
+ * Return values:
+ * %0: Entry was successfully encoded.
+ * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
+ *
+ * On exit, the following fields are updated:
+ * - resp->xdr
+ * - resp->common.err
+ * - resp->cookie_offset
+ */
+int nfs3svc_encode_entry3(void *data, const char *name, int namlen,
+ loff_t offset, u64 ino, unsigned int d_type)
+{
+ struct readdir_cd *ccd = data;
+ struct nfsd3_readdirres *resp = container_of(ccd,
+ struct nfsd3_readdirres,
+ common);
+ unsigned int starting_length = resp->dirlist.len;
+
+ /* The offset cookie for the previous entry */
+ nfs3svc_encode_cookie3(resp, offset);
+
+ if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
+ goto out_toosmall;
+
+ xdr_commit_encode(&resp->xdr);
+ resp->common.err = nfs_ok;
+ return 0;
+
+out_toosmall:
+ resp->cookie_offset = 0;
+ resp->common.err = nfserr_toosmall;
+ resp->dirlist.len = starting_length;
+ return -EINVAL;
+}
+
+static bool
+svcxdr_encode_entry3_plus(struct nfsd3_readdirres *resp, const char *name,
+ int namlen, u64 ino)
+{
+ struct xdr_stream *xdr = &resp->xdr;
+ struct svc_fh *fhp = &resp->scratch;
+ bool result;
+
+ result = false;
+ fh_init(fhp, NFS3_FHSIZE);
+ if (compose_entry_fh(resp, fhp, name, namlen, ino) != nfs_ok)
+ goto out_noattrs;
+
+ if (!svcxdr_encode_post_op_attr(resp->rqstp, xdr, fhp))
+ goto out;
+ if (!svcxdr_encode_post_op_fh3(xdr, fhp))
+ goto out;
+ result = true;
+
+out:
+ fh_put(fhp);
+ return result;
+
+out_noattrs:
+ if (xdr_stream_encode_item_absent(xdr) < 0)
+ return false;
+ if (xdr_stream_encode_item_absent(xdr) < 0)
+ return false;
+ return true;
+}
+
+/**
+ * nfs3svc_encode_entryplus3 - encode one NFSv3 READDIRPLUS entry
+ * @data: directory context
+ * @name: name of the object to be encoded
+ * @namlen: length of that name, in bytes
+ * @offset: the offset of the previous entry
+ * @ino: the fileid of this entry
+ * @d_type: unused
+ *
+ * Return values:
+ * %0: Entry was successfully encoded.
+ * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
+ *
+ * On exit, the following fields are updated:
+ * - resp->xdr
+ * - resp->common.err
+ * - resp->cookie_offset
+ */
+int nfs3svc_encode_entryplus3(void *data, const char *name, int namlen,
+ loff_t offset, u64 ino, unsigned int d_type)
+{
+ struct readdir_cd *ccd = data;
+ struct nfsd3_readdirres *resp = container_of(ccd,
+ struct nfsd3_readdirres,
+ common);
+ unsigned int starting_length = resp->dirlist.len;
+
+ /* The offset cookie for the previous entry */
+ nfs3svc_encode_cookie3(resp, offset);
+
+ if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
+ goto out_toosmall;
+ if (!svcxdr_encode_entry3_plus(resp, name, namlen, ino))
+ goto out_toosmall;
+
+ xdr_commit_encode(&resp->xdr);
+ resp->common.err = nfs_ok;
+ return 0;
+
+out_toosmall:
+ resp->cookie_offset = 0;
+ resp->common.err = nfserr_toosmall;
+ resp->dirlist.len = starting_length;
+ return -EINVAL;
+}
+
+static bool
+svcxdr_encode_fsstat3resok(struct xdr_stream *xdr,
+ const struct nfsd3_fsstatres *resp)
+{
+ const struct kstatfs *s = &resp->stats;
+ u64 bs = s->f_bsize;
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, XDR_UNIT * 13);
+ if (!p)
+ return false;
+ 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 = cpu_to_be32(resp->invarsec); /* mean unchanged time */
+
+ return true;
+}
+
+/* FSSTAT */
+bool
+nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_fsstatres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
+ return false;
+ if (!svcxdr_encode_fsstat3resok(xdr, resp))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+svcxdr_encode_fsinfo3resok(struct xdr_stream *xdr,
+ const struct nfsd3_fsinfores *resp)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, XDR_UNIT * 12);
+ if (!p)
+ return false;
+ *p++ = cpu_to_be32(resp->f_rtmax);
+ *p++ = cpu_to_be32(resp->f_rtpref);
+ *p++ = cpu_to_be32(resp->f_rtmult);
+ *p++ = cpu_to_be32(resp->f_wtmax);
+ *p++ = cpu_to_be32(resp->f_wtpref);
+ *p++ = cpu_to_be32(resp->f_wtmult);
+ *p++ = cpu_to_be32(resp->f_dtpref);
+ p = xdr_encode_hyper(p, resp->f_maxfilesize);
+ p = encode_nfstime3(p, &nfs3svc_time_delta);
+ *p = cpu_to_be32(resp->f_properties);
+
+ return true;
+}
+
+/* FSINFO */
+bool
+nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_fsinfores *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
+ return false;
+ if (!svcxdr_encode_fsinfo3resok(xdr, resp))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+svcxdr_encode_pathconf3resok(struct xdr_stream *xdr,
+ const struct nfsd3_pathconfres *resp)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, XDR_UNIT * 6);
+ if (!p)
+ return false;
+ *p++ = cpu_to_be32(resp->p_link_max);
+ *p++ = cpu_to_be32(resp->p_name_max);
+ p = xdr_encode_bool(p, resp->p_no_trunc);
+ p = xdr_encode_bool(p, resp->p_chown_restricted);
+ p = xdr_encode_bool(p, resp->p_case_insensitive);
+ xdr_encode_bool(p, resp->p_case_preserving);
+
+ return true;
+}
+
+/* PATHCONF */
+bool
+nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_pathconfres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
+ return false;
+ if (!svcxdr_encode_pathconf3resok(xdr, resp))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
+ return false;
+ }
+
+ return true;
+}
+
+/* COMMIT */
+bool
+nfs3svc_encode_commitres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+ struct nfsd3_commitres *resp = rqstp->rq_resp;
+
+ if (!svcxdr_encode_nfsstat3(xdr, resp->status))
+ return false;
+ switch (resp->status) {
+ case nfs_ok:
+ if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
+ return false;
+ if (!svcxdr_encode_writeverf3(xdr, resp->verf))
+ return false;
+ break;
+ default:
+ if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * 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);
+}