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linux-next/fs/nfs/nfs3xdr.c
Chuck Lever 02ef04e432 NFS: Account for XDR pad of buf->pages 
Certain NFS results (eg. READLINK) might expect a data payload that
is not an exact multiple of 4 bytes. In this case, XDR encoding
is required to pad that payload so its length on the wire is a
multiple of 4 bytes. The constants that define the maximum size of
each NFS result do not appear to account for this extra word.

In each case where the data payload is to be received into pages:

- 1 word is added to the size of the receive buffer allocated by
  call_allocate

- rpc_inline_rcv_pages subtracts 1 word from @hdrsize so that the
  extra buffer space falls into the rcv_buf's tail iovec

- If buf->pagelen is word-aligned, an XDR pad is not needed and
  is thus removed from the tail

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-02-14 10:13:49 -05:00

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// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/nfs/nfs3xdr.c
*
* XDR functions to encode/decode NFSv3 RPC arguments and results.
*
* Copyright (C) 1996, 1997 Olaf Kirch
*/
#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfsacl.h>
#include "nfstrace.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_XDR
/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO EIO
/*
* Declare the space requirements for NFS arguments and replies as
* number of 32bit-words
*/
#define NFS3_fhandle_sz (1+16)
#define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
#define NFS3_sattr_sz (15)
#define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
#define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
#define NFS3_fattr_sz (21)
#define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
#define NFS3_wcc_attr_sz (6)
#define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
#define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
#define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
#define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_getattrargs_sz (NFS3_fh_sz)
#define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
#define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_accessargs_sz (NFS3_fh_sz+1)
#define NFS3_readlinkargs_sz (NFS3_fh_sz)
#define NFS3_readargs_sz (NFS3_fh_sz+3)
#define NFS3_writeargs_sz (NFS3_fh_sz+5)
#define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
#define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
#define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
#define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
#define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
#define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
#define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
#define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
#define NFS3_commitargs_sz (NFS3_fh_sz+3)
#define NFS3_getattrres_sz (1+NFS3_fattr_sz)
#define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
#define NFS3_removeres_sz (NFS3_setattrres_sz)
#define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
#define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
#define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+1)
#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+1)
#define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
#define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
#define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
#define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+1)
#define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
#define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
#define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
#define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
#define ACL3_getaclargs_sz (NFS3_fh_sz+1)
#define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
#define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1)
#define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
static int nfs3_stat_to_errno(enum nfs_stat);
/*
* Map file type to S_IFMT bits
*/
static const umode_t nfs_type2fmt[] = {
[NF3BAD] = 0,
[NF3REG] = S_IFREG,
[NF3DIR] = S_IFDIR,
[NF3BLK] = S_IFBLK,
[NF3CHR] = S_IFCHR,
[NF3LNK] = S_IFLNK,
[NF3SOCK] = S_IFSOCK,
[NF3FIFO] = S_IFIFO,
};
/*
* Encode/decode NFSv3 basic data types
*
* Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
* "NFS Version 3 Protocol Specification".
*
* Not all basic data types have their own encoding and decoding
* functions. For run-time efficiency, some data types are encoded
* or decoded inline.
*/
static void encode_uint32(struct xdr_stream *xdr, u32 value)
{
__be32 *p = xdr_reserve_space(xdr, 4);
*p = cpu_to_be32(value);
}
static int decode_uint32(struct xdr_stream *xdr, u32 *value)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
*value = be32_to_cpup(p);
return 0;
}
static int decode_uint64(struct xdr_stream *xdr, u64 *value)
{
__be32 *p;
p = xdr_inline_decode(xdr, 8);
if (unlikely(!p))
return -EIO;
xdr_decode_hyper(p, value);
return 0;
}
/*
* fileid3
*
* typedef uint64 fileid3;
*/
static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
{
return xdr_decode_hyper(p, fileid);
}
static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
{
return decode_uint64(xdr, fileid);
}
/*
* filename3
*
* typedef string filename3<>;
*/
static void encode_filename3(struct xdr_stream *xdr,
const char *name, u32 length)
{
__be32 *p;
WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
p = xdr_reserve_space(xdr, 4 + length);
xdr_encode_opaque(p, name, length);
}
static int decode_inline_filename3(struct xdr_stream *xdr,
const char **name, u32 *length)
{
__be32 *p;
u32 count;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
count = be32_to_cpup(p);
if (count > NFS3_MAXNAMLEN)
goto out_nametoolong;
p = xdr_inline_decode(xdr, count);
if (unlikely(!p))
return -EIO;
*name = (const char *)p;
*length = count;
return 0;
out_nametoolong:
dprintk("NFS: returned filename too long: %u\n", count);
return -ENAMETOOLONG;
}
/*
* nfspath3
*
* typedef string nfspath3<>;
*/
static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
const u32 length)
{
encode_uint32(xdr, length);
xdr_write_pages(xdr, pages, 0, length);
}
static int decode_nfspath3(struct xdr_stream *xdr)
{
u32 recvd, count;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
count = be32_to_cpup(p);
if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
goto out_nametoolong;
recvd = xdr_read_pages(xdr, count);
if (unlikely(count > recvd))
goto out_cheating;
xdr_terminate_string(xdr->buf, count);
return 0;
out_nametoolong:
dprintk("NFS: returned pathname too long: %u\n", count);
return -ENAMETOOLONG;
out_cheating:
dprintk("NFS: server cheating in pathname result: "
"count %u > recvd %u\n", count, recvd);
return -EIO;
}
/*
* cookie3
*
* typedef uint64 cookie3
*/
static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
{
return xdr_encode_hyper(p, cookie);
}
static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
{
return decode_uint64(xdr, cookie);
}
/*
* cookieverf3
*
* typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
*/
static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
{
memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
}
static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
{
__be32 *p;
p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
if (unlikely(!p))
return -EIO;
memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
return 0;
}
/*
* createverf3
*
* typedef opaque createverf3[NFS3_CREATEVERFSIZE];
*/
static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
{
__be32 *p;
p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
memcpy(p, verifier, NFS3_CREATEVERFSIZE);
}
static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
{
__be32 *p;
p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
if (unlikely(!p))
return -EIO;
memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
return 0;
}
/*
* size3
*
* typedef uint64 size3;
*/
static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
{
return xdr_decode_hyper(p, size);
}
/*
* nfsstat3
*
* enum nfsstat3 {
* NFS3_OK = 0,
* ...
* }
*/
#define NFS3_OK NFS_OK
static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
if (unlikely(*p != cpu_to_be32(NFS3_OK)))
goto out_status;
*status = 0;
return 0;
out_status:
*status = be32_to_cpup(p);
trace_nfs_xdr_status((int)*status);
return 0;
}
/*
* ftype3
*
* enum ftype3 {
* NF3REG = 1,
* NF3DIR = 2,
* NF3BLK = 3,
* NF3CHR = 4,
* NF3LNK = 5,
* NF3SOCK = 6,
* NF3FIFO = 7
* };
*/
static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
{
encode_uint32(xdr, type);
}
static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
{
u32 type;
type = be32_to_cpup(p++);
if (type > NF3FIFO)
type = NF3NON;
*mode = nfs_type2fmt[type];
return p;
}
/*
* specdata3
*
* struct specdata3 {
* uint32 specdata1;
* uint32 specdata2;
* };
*/
static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
{
__be32 *p;
p = xdr_reserve_space(xdr, 8);
*p++ = cpu_to_be32(MAJOR(rdev));
*p = cpu_to_be32(MINOR(rdev));
}
static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
{
unsigned int major, minor;
major = be32_to_cpup(p++);
minor = be32_to_cpup(p++);
*rdev = MKDEV(major, minor);
if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
*rdev = 0;
return p;
}
/*
* nfs_fh3
*
* struct nfs_fh3 {
* opaque data<NFS3_FHSIZE>;
* };
*/
static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
{
__be32 *p;
WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
p = xdr_reserve_space(xdr, 4 + fh->size);
xdr_encode_opaque(p, fh->data, fh->size);
}
static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
u32 length;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
length = be32_to_cpup(p++);
if (unlikely(length > NFS3_FHSIZE))
goto out_toobig;
p = xdr_inline_decode(xdr, length);
if (unlikely(!p))
return -EIO;
fh->size = length;
memcpy(fh->data, p, length);
return 0;
out_toobig:
dprintk("NFS: file handle size (%u) too big\n", length);
return -E2BIG;
}
static void zero_nfs_fh3(struct nfs_fh *fh)
{
memset(fh, 0, sizeof(*fh));
}
/*
* nfstime3
*
* struct nfstime3 {
* uint32 seconds;
* uint32 nseconds;
* };
*/
static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
{
*p++ = cpu_to_be32(timep->tv_sec);
*p++ = cpu_to_be32(timep->tv_nsec);
return p;
}
static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
{
timep->tv_sec = be32_to_cpup(p++);
timep->tv_nsec = be32_to_cpup(p++);
return p;
}
/*
* sattr3
*
* enum time_how {
* DONT_CHANGE = 0,
* SET_TO_SERVER_TIME = 1,
* SET_TO_CLIENT_TIME = 2
* };
*
* union set_mode3 switch (bool set_it) {
* case TRUE:
* mode3 mode;
* default:
* void;
* };
*
* union set_uid3 switch (bool set_it) {
* case TRUE:
* uid3 uid;
* default:
* void;
* };
*
* union set_gid3 switch (bool set_it) {
* case TRUE:
* gid3 gid;
* default:
* void;
* };
*
* union set_size3 switch (bool set_it) {
* case TRUE:
* size3 size;
* default:
* void;
* };
*
* union set_atime switch (time_how set_it) {
* case SET_TO_CLIENT_TIME:
* nfstime3 atime;
* default:
* void;
* };
*
* union set_mtime switch (time_how set_it) {
* case SET_TO_CLIENT_TIME:
* nfstime3 mtime;
* default:
* void;
* };
*
* struct sattr3 {
* set_mode3 mode;
* set_uid3 uid;
* set_gid3 gid;
* set_size3 size;
* set_atime atime;
* set_mtime mtime;
* };
*/
static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr)
{
struct timespec ts;
u32 nbytes;
__be32 *p;
/*
* In order to make only a single xdr_reserve_space() call,
* pre-compute the total number of bytes to be reserved.
* Six boolean values, one for each set_foo field, are always
* present in the encoded result, so start there.
*/
nbytes = 6 * 4;
if (attr->ia_valid & ATTR_MODE)
nbytes += 4;
if (attr->ia_valid & ATTR_UID)
nbytes += 4;
if (attr->ia_valid & ATTR_GID)
nbytes += 4;
if (attr->ia_valid & ATTR_SIZE)
nbytes += 8;
if (attr->ia_valid & ATTR_ATIME_SET)
nbytes += 8;
if (attr->ia_valid & ATTR_MTIME_SET)
nbytes += 8;
p = xdr_reserve_space(xdr, nbytes);
if (attr->ia_valid & ATTR_MODE) {
*p++ = xdr_one;
*p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_UID) {
*p++ = xdr_one;
*p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_GID) {
*p++ = xdr_one;
*p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_SIZE) {
*p++ = xdr_one;
p = xdr_encode_hyper(p, (u64)attr->ia_size);
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_ATIME_SET) {
struct timespec ts;
*p++ = xdr_two;
ts = timespec64_to_timespec(attr->ia_atime);
p = xdr_encode_nfstime3(p, &ts);
} else if (attr->ia_valid & ATTR_ATIME) {
*p++ = xdr_one;
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_MTIME_SET) {
*p++ = xdr_two;
ts = timespec64_to_timespec(attr->ia_mtime);
xdr_encode_nfstime3(p, &ts);
} else if (attr->ia_valid & ATTR_MTIME) {
*p = xdr_one;
} else
*p = xdr_zero;
}
/*
* fattr3
*
* struct fattr3 {
* ftype3 type;
* mode3 mode;
* uint32 nlink;
* uid3 uid;
* gid3 gid;
* size3 size;
* size3 used;
* specdata3 rdev;
* uint64 fsid;
* fileid3 fileid;
* nfstime3 atime;
* nfstime3 mtime;
* nfstime3 ctime;
* };
*/
static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
umode_t fmode;
__be32 *p;
p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
if (unlikely(!p))
return -EIO;
p = xdr_decode_ftype3(p, &fmode);
fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
fattr->nlink = be32_to_cpup(p++);
fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
if (!uid_valid(fattr->uid))
goto out_uid;
fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
if (!gid_valid(fattr->gid))
goto out_gid;
p = xdr_decode_size3(p, &fattr->size);
p = xdr_decode_size3(p, &fattr->du.nfs3.used);
p = xdr_decode_specdata3(p, &fattr->rdev);
p = xdr_decode_hyper(p, &fattr->fsid.major);
fattr->fsid.minor = 0;
p = xdr_decode_fileid3(p, &fattr->fileid);
p = xdr_decode_nfstime3(p, &fattr->atime);
p = xdr_decode_nfstime3(p, &fattr->mtime);
xdr_decode_nfstime3(p, &fattr->ctime);
fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
fattr->valid |= NFS_ATTR_FATTR_V3;
return 0;
out_uid:
dprintk("NFS: returned invalid uid\n");
return -EINVAL;
out_gid:
dprintk("NFS: returned invalid gid\n");
return -EINVAL;
}
/*
* post_op_attr
*
* union post_op_attr switch (bool attributes_follow) {
* case TRUE:
* fattr3 attributes;
* case FALSE:
* void;
* };
*/
static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
if (*p != xdr_zero)
return decode_fattr3(xdr, fattr);
return 0;
}
/*
* wcc_attr
* struct wcc_attr {
* size3 size;
* nfstime3 mtime;
* nfstime3 ctime;
* };
*/
static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
__be32 *p;
p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
if (unlikely(!p))
return -EIO;
fattr->valid |= NFS_ATTR_FATTR_PRESIZE
| NFS_ATTR_FATTR_PRECHANGE
| NFS_ATTR_FATTR_PREMTIME
| NFS_ATTR_FATTR_PRECTIME;
p = xdr_decode_size3(p, &fattr->pre_size);
p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
xdr_decode_nfstime3(p, &fattr->pre_ctime);
fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
return 0;
}
/*
* pre_op_attr
* union pre_op_attr switch (bool attributes_follow) {
* case TRUE:
* wcc_attr attributes;
* case FALSE:
* void;
* };
*
* wcc_data
*
* struct wcc_data {
* pre_op_attr before;
* post_op_attr after;
* };
*/
static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
if (*p != xdr_zero)
return decode_wcc_attr(xdr, fattr);
return 0;
}
static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr)
{
int error;
error = decode_pre_op_attr(xdr, fattr);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, fattr);
out:
return error;
}
/*
* post_op_fh3
*
* union post_op_fh3 switch (bool handle_follows) {
* case TRUE:
* nfs_fh3 handle;
* case FALSE:
* void;
* };
*/
static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
{
__be32 *p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EIO;
if (*p != xdr_zero)
return decode_nfs_fh3(xdr, fh);
zero_nfs_fh3(fh);
return 0;
}
/*
* diropargs3
*
* struct diropargs3 {
* nfs_fh3 dir;
* filename3 name;
* };
*/
static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
const char *name, u32 length)
{
encode_nfs_fh3(xdr, fh);
encode_filename3(xdr, name, length);
}
/*
* NFSv3 XDR encode functions
*
* NFSv3 argument types are defined in section 3.3 of RFC 1813:
* "NFS Version 3 Protocol Specification".
*/
/*
* 3.3.1 GETATTR3args
*
* struct GETATTR3args {
* nfs_fh3 object;
* };
*/
static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs_fh *fh = data;
encode_nfs_fh3(xdr, fh);
}
/*
* 3.3.2 SETATTR3args
*
* union sattrguard3 switch (bool check) {
* case TRUE:
* nfstime3 obj_ctime;
* case FALSE:
* void;
* };
*
* struct SETATTR3args {
* nfs_fh3 object;
* sattr3 new_attributes;
* sattrguard3 guard;
* };
*/
static void encode_sattrguard3(struct xdr_stream *xdr,
const struct nfs3_sattrargs *args)
{
__be32 *p;
if (args->guard) {
p = xdr_reserve_space(xdr, 4 + 8);
*p++ = xdr_one;
xdr_encode_nfstime3(p, &args->guardtime);
} else {
p = xdr_reserve_space(xdr, 4);
*p = xdr_zero;
}
}
static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_sattrargs *args = data;
encode_nfs_fh3(xdr, args->fh);
encode_sattr3(xdr, args->sattr);
encode_sattrguard3(xdr, args);
}
/*
* 3.3.3 LOOKUP3args
*
* struct LOOKUP3args {
* diropargs3 what;
* };
*/
static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_diropargs *args = data;
encode_diropargs3(xdr, args->fh, args->name, args->len);
}
/*
* 3.3.4 ACCESS3args
*
* struct ACCESS3args {
* nfs_fh3 object;
* uint32 access;
* };
*/
static void encode_access3args(struct xdr_stream *xdr,
const struct nfs3_accessargs *args)
{
encode_nfs_fh3(xdr, args->fh);
encode_uint32(xdr, args->access);
}
static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_accessargs *args = data;
encode_access3args(xdr, args);
}
/*
* 3.3.5 READLINK3args
*
* struct READLINK3args {
* nfs_fh3 symlink;
* };
*/
static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_readlinkargs *args = data;
encode_nfs_fh3(xdr, args->fh);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->pglen, NFS3_readlinkres_sz);
}
/*
* 3.3.6 READ3args
*
* struct READ3args {
* nfs_fh3 file;
* offset3 offset;
* count3 count;
* };
*/
static void encode_read3args(struct xdr_stream *xdr,
const struct nfs_pgio_args *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + 4);
p = xdr_encode_hyper(p, args->offset);
*p = cpu_to_be32(args->count);
}
static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs_pgio_args *args = data;
unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
encode_read3args(xdr, args);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->count, replen);
req->rq_rcv_buf.flags |= XDRBUF_READ;
}
/*
* 3.3.7 WRITE3args
*
* enum stable_how {
* UNSTABLE = 0,
* DATA_SYNC = 1,
* FILE_SYNC = 2
* };
*
* struct WRITE3args {
* nfs_fh3 file;
* offset3 offset;
* count3 count;
* stable_how stable;
* opaque data<>;
* };
*/
static void encode_write3args(struct xdr_stream *xdr,
const struct nfs_pgio_args *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
p = xdr_encode_hyper(p, args->offset);
*p++ = cpu_to_be32(args->count);
*p++ = cpu_to_be32(args->stable);
*p = cpu_to_be32(args->count);
xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
}
static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs_pgio_args *args = data;
encode_write3args(xdr, args);
xdr->buf->flags |= XDRBUF_WRITE;
}
/*
* 3.3.8 CREATE3args
*
* enum createmode3 {
* UNCHECKED = 0,
* GUARDED = 1,
* EXCLUSIVE = 2
* };
*
* union createhow3 switch (createmode3 mode) {
* case UNCHECKED:
* case GUARDED:
* sattr3 obj_attributes;
* case EXCLUSIVE:
* createverf3 verf;
* };
*
* struct CREATE3args {
* diropargs3 where;
* createhow3 how;
* };
*/
static void encode_createhow3(struct xdr_stream *xdr,
const struct nfs3_createargs *args)
{
encode_uint32(xdr, args->createmode);
switch (args->createmode) {
case NFS3_CREATE_UNCHECKED:
case NFS3_CREATE_GUARDED:
encode_sattr3(xdr, args->sattr);
break;
case NFS3_CREATE_EXCLUSIVE:
encode_createverf3(xdr, args->verifier);
break;
default:
BUG();
}
}
static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_createargs *args = data;
encode_diropargs3(xdr, args->fh, args->name, args->len);
encode_createhow3(xdr, args);
}
/*
* 3.3.9 MKDIR3args
*
* struct MKDIR3args {
* diropargs3 where;
* sattr3 attributes;
* };
*/
static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_mkdirargs *args = data;
encode_diropargs3(xdr, args->fh, args->name, args->len);
encode_sattr3(xdr, args->sattr);
}
/*
* 3.3.10 SYMLINK3args
*
* struct symlinkdata3 {
* sattr3 symlink_attributes;
* nfspath3 symlink_data;
* };
*
* struct SYMLINK3args {
* diropargs3 where;
* symlinkdata3 symlink;
* };
*/
static void encode_symlinkdata3(struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_symlinkargs *args = data;
encode_sattr3(xdr, args->sattr);
encode_nfspath3(xdr, args->pages, args->pathlen);
}
static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_symlinkargs *args = data;
encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
encode_symlinkdata3(xdr, args);
xdr->buf->flags |= XDRBUF_WRITE;
}
/*
* 3.3.11 MKNOD3args
*
* struct devicedata3 {
* sattr3 dev_attributes;
* specdata3 spec;
* };
*
* union mknoddata3 switch (ftype3 type) {
* case NF3CHR:
* case NF3BLK:
* devicedata3 device;
* case NF3SOCK:
* case NF3FIFO:
* sattr3 pipe_attributes;
* default:
* void;
* };
*
* struct MKNOD3args {
* diropargs3 where;
* mknoddata3 what;
* };
*/
static void encode_devicedata3(struct xdr_stream *xdr,
const struct nfs3_mknodargs *args)
{
encode_sattr3(xdr, args->sattr);
encode_specdata3(xdr, args->rdev);
}
static void encode_mknoddata3(struct xdr_stream *xdr,
const struct nfs3_mknodargs *args)
{
encode_ftype3(xdr, args->type);
switch (args->type) {
case NF3CHR:
case NF3BLK:
encode_devicedata3(xdr, args);
break;
case NF3SOCK:
case NF3FIFO:
encode_sattr3(xdr, args->sattr);
break;
case NF3REG:
case NF3DIR:
break;
default:
BUG();
}
}
static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_mknodargs *args = data;
encode_diropargs3(xdr, args->fh, args->name, args->len);
encode_mknoddata3(xdr, args);
}
/*
* 3.3.12 REMOVE3args
*
* struct REMOVE3args {
* diropargs3 object;
* };
*/
static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs_removeargs *args = data;
encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
}
/*
* 3.3.14 RENAME3args
*
* struct RENAME3args {
* diropargs3 from;
* diropargs3 to;
* };
*/
static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs_renameargs *args = data;
const struct qstr *old = args->old_name;
const struct qstr *new = args->new_name;
encode_diropargs3(xdr, args->old_dir, old->name, old->len);
encode_diropargs3(xdr, args->new_dir, new->name, new->len);
}
/*
* 3.3.15 LINK3args
*
* struct LINK3args {
* nfs_fh3 file;
* diropargs3 link;
* };
*/
static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_linkargs *args = data;
encode_nfs_fh3(xdr, args->fromfh);
encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
}
/*
* 3.3.16 READDIR3args
*
* struct READDIR3args {
* nfs_fh3 dir;
* cookie3 cookie;
* cookieverf3 cookieverf;
* count3 count;
* };
*/
static void encode_readdir3args(struct xdr_stream *xdr,
const struct nfs3_readdirargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
p = xdr_encode_cookie3(p, args->cookie);
p = xdr_encode_cookieverf3(p, args->verf);
*p = cpu_to_be32(args->count);
}
static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_readdirargs *args = data;
encode_readdir3args(xdr, args);
rpc_prepare_reply_pages(req, args->pages, 0,
args->count, NFS3_readdirres_sz);
}
/*
* 3.3.17 READDIRPLUS3args
*
* struct READDIRPLUS3args {
* nfs_fh3 dir;
* cookie3 cookie;
* cookieverf3 cookieverf;
* count3 dircount;
* count3 maxcount;
* };
*/
static void encode_readdirplus3args(struct xdr_stream *xdr,
const struct nfs3_readdirargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
p = xdr_encode_cookie3(p, args->cookie);
p = xdr_encode_cookieverf3(p, args->verf);
/*
* readdirplus: need dircount + buffer size.
* We just make sure we make dircount big enough
*/
*p++ = cpu_to_be32(args->count >> 3);
*p = cpu_to_be32(args->count);
}
static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_readdirargs *args = data;
encode_readdirplus3args(xdr, args);
rpc_prepare_reply_pages(req, args->pages, 0,
args->count, NFS3_readdirres_sz);
}
/*
* 3.3.21 COMMIT3args
*
* struct COMMIT3args {
* nfs_fh3 file;
* offset3 offset;
* count3 count;
* };
*/
static void encode_commit3args(struct xdr_stream *xdr,
const struct nfs_commitargs *args)
{
__be32 *p;
encode_nfs_fh3(xdr, args->fh);
p = xdr_reserve_space(xdr, 8 + 4);
p = xdr_encode_hyper(p, args->offset);
*p = cpu_to_be32(args->count);
}
static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs_commitargs *args = data;
encode_commit3args(xdr, args);
}
#ifdef CONFIG_NFS_V3_ACL
static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_getaclargs *args = data;
encode_nfs_fh3(xdr, args->fh);
encode_uint32(xdr, args->mask);
if (args->mask & (NFS_ACL | NFS_DFACL)) {
rpc_prepare_reply_pages(req, args->pages, 0,
NFSACL_MAXPAGES << PAGE_SHIFT,
ACL3_getaclres_sz);
req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
}
}
static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const void *data)
{
const struct nfs3_setaclargs *args = data;
unsigned int base;
int error;
encode_nfs_fh3(xdr, NFS_FH(args->inode));
encode_uint32(xdr, args->mask);
base = req->rq_slen;
if (args->npages != 0)
xdr_write_pages(xdr, args->pages, 0, args->len);
else
xdr_reserve_space(xdr, args->len);
error = nfsacl_encode(xdr->buf, base, args->inode,
(args->mask & NFS_ACL) ?
args->acl_access : NULL, 1, 0);
/* FIXME: this is just broken */
BUG_ON(error < 0);
error = nfsacl_encode(xdr->buf, base + error, args->inode,
(args->mask & NFS_DFACL) ?
args->acl_default : NULL, 1,
NFS_ACL_DEFAULT);
BUG_ON(error < 0);
}
#endif /* CONFIG_NFS_V3_ACL */
/*
* NFSv3 XDR decode functions
*
* NFSv3 result types are defined in section 3.3 of RFC 1813:
* "NFS Version 3 Protocol Specification".
*/
/*
* 3.3.1 GETATTR3res
*
* struct GETATTR3resok {
* fattr3 obj_attributes;
* };
*
* union GETATTR3res switch (nfsstat3 status) {
* case NFS3_OK:
* GETATTR3resok resok;
* default:
* void;
* };
*/
static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *result)
{
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_fattr3(xdr, result);
out:
return error;
out_default:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.2 SETATTR3res
*
* struct SETATTR3resok {
* wcc_data obj_wcc;
* };
*
* struct SETATTR3resfail {
* wcc_data obj_wcc;
* };
*
* union SETATTR3res switch (nfsstat3 status) {
* case NFS3_OK:
* SETATTR3resok resok;
* default:
* SETATTR3resfail resfail;
* };
*/
static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *result)
{
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.3 LOOKUP3res
*
* struct LOOKUP3resok {
* nfs_fh3 object;
* post_op_attr obj_attributes;
* post_op_attr dir_attributes;
* };
*
* struct LOOKUP3resfail {
* post_op_attr dir_attributes;
* };
*
* union LOOKUP3res switch (nfsstat3 status) {
* case NFS3_OK:
* LOOKUP3resok resok;
* default:
* LOOKUP3resfail resfail;
* };
*/
static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs3_diropres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_nfs_fh3(xdr, result->fh);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->dir_attr);
out:
return error;
out_default:
error = decode_post_op_attr(xdr, result->dir_attr);
if (unlikely(error))
goto out;
return nfs3_stat_to_errno(status);
}
/*
* 3.3.4 ACCESS3res
*
* struct ACCESS3resok {
* post_op_attr obj_attributes;
* uint32 access;
* };
*
* struct ACCESS3resfail {
* post_op_attr obj_attributes;
* };
*
* union ACCESS3res switch (nfsstat3 status) {
* case NFS3_OK:
* ACCESS3resok resok;
* default:
* ACCESS3resfail resfail;
* };
*/
static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs3_accessres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_uint32(xdr, &result->access);
out:
return error;
out_default:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.5 READLINK3res
*
* struct READLINK3resok {
* post_op_attr symlink_attributes;
* nfspath3 data;
* };
*
* struct READLINK3resfail {
* post_op_attr symlink_attributes;
* };
*
* union READLINK3res switch (nfsstat3 status) {
* case NFS3_OK:
* READLINK3resok resok;
* default:
* READLINK3resfail resfail;
* };
*/
static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *result)
{
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_nfspath3(xdr);
out:
return error;
out_default:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.6 READ3res
*
* struct READ3resok {
* post_op_attr file_attributes;
* count3 count;
* bool eof;
* opaque data<>;
* };
*
* struct READ3resfail {
* post_op_attr file_attributes;
* };
*
* union READ3res switch (nfsstat3 status) {
* case NFS3_OK:
* READ3resok resok;
* default:
* READ3resfail resfail;
* };
*/
static int decode_read3resok(struct xdr_stream *xdr,
struct nfs_pgio_res *result)
{
u32 eof, count, ocount, recvd;
__be32 *p;
p = xdr_inline_decode(xdr, 4 + 4 + 4);
if (unlikely(!p))
return -EIO;
count = be32_to_cpup(p++);
eof = be32_to_cpup(p++);
ocount = be32_to_cpup(p++);
if (unlikely(ocount != count))
goto out_mismatch;
recvd = xdr_read_pages(xdr, count);
if (unlikely(count > recvd))
goto out_cheating;
out:
result->eof = eof;
result->count = count;
return count;
out_mismatch:
dprintk("NFS: READ count doesn't match length of opaque: "
"count %u != ocount %u\n", count, ocount);
return -EIO;
out_cheating:
dprintk("NFS: server cheating in read result: "
"count %u > recvd %u\n", count, recvd);
count = recvd;
eof = 0;
goto out;
}
static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
void *data)
{
struct nfs_pgio_res *result = data;
unsigned int pos;
enum nfs_stat status;
int error;
pos = xdr_stream_pos(xdr);
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
result->op_status = status;
if (status != NFS3_OK)
goto out_status;
result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
error = decode_read3resok(xdr, result);
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.7 WRITE3res
*
* enum stable_how {
* UNSTABLE = 0,
* DATA_SYNC = 1,
* FILE_SYNC = 2
* };
*
* struct WRITE3resok {
* wcc_data file_wcc;
* count3 count;
* stable_how committed;
* writeverf3 verf;
* };
*
* struct WRITE3resfail {
* wcc_data file_wcc;
* };
*
* union WRITE3res switch (nfsstat3 status) {
* case NFS3_OK:
* WRITE3resok resok;
* default:
* WRITE3resfail resfail;
* };
*/
static int decode_write3resok(struct xdr_stream *xdr,
struct nfs_pgio_res *result)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4 + 4);
if (unlikely(!p))
return -EIO;
result->count = be32_to_cpup(p++);
result->verf->committed = be32_to_cpup(p++);
if (unlikely(result->verf->committed > NFS_FILE_SYNC))
goto out_badvalue;
if (decode_writeverf3(xdr, &result->verf->verifier))
return -EIO;
return result->count;
out_badvalue:
dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
return -EIO;
}
static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
void *data)
{
struct nfs_pgio_res *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result->fattr);
if (unlikely(error))
goto out;
result->op_status = status;
if (status != NFS3_OK)
goto out_status;
error = decode_write3resok(xdr, result);
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.8 CREATE3res
*
* struct CREATE3resok {
* post_op_fh3 obj;
* post_op_attr obj_attributes;
* wcc_data dir_wcc;
* };
*
* struct CREATE3resfail {
* wcc_data dir_wcc;
* };
*
* union CREATE3res switch (nfsstat3 status) {
* case NFS3_OK:
* CREATE3resok resok;
* default:
* CREATE3resfail resfail;
* };
*/
static int decode_create3resok(struct xdr_stream *xdr,
struct nfs3_diropres *result)
{
int error;
error = decode_post_op_fh3(xdr, result->fh);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
/* The server isn't required to return a file handle.
* If it didn't, force the client to perform a LOOKUP
* to determine the correct file handle and attribute
* values for the new object. */
if (result->fh->size == 0)
result->fattr->valid = 0;
error = decode_wcc_data(xdr, result->dir_attr);
out:
return error;
}
static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs3_diropres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_create3resok(xdr, result);
out:
return error;
out_default:
error = decode_wcc_data(xdr, result->dir_attr);
if (unlikely(error))
goto out;
return nfs3_stat_to_errno(status);
}
/*
* 3.3.12 REMOVE3res
*
* struct REMOVE3resok {
* wcc_data dir_wcc;
* };
*
* struct REMOVE3resfail {
* wcc_data dir_wcc;
* };
*
* union REMOVE3res switch (nfsstat3 status) {
* case NFS3_OK:
* REMOVE3resok resok;
* default:
* REMOVE3resfail resfail;
* };
*/
static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs_removeres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result->dir_attr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.14 RENAME3res
*
* struct RENAME3resok {
* wcc_data fromdir_wcc;
* wcc_data todir_wcc;
* };
*
* struct RENAME3resfail {
* wcc_data fromdir_wcc;
* wcc_data todir_wcc;
* };
*
* union RENAME3res switch (nfsstat3 status) {
* case NFS3_OK:
* RENAME3resok resok;
* default:
* RENAME3resfail resfail;
* };
*/
static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs_renameres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result->old_fattr);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result->new_fattr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.15 LINK3res
*
* struct LINK3resok {
* post_op_attr file_attributes;
* wcc_data linkdir_wcc;
* };
*
* struct LINK3resfail {
* post_op_attr file_attributes;
* wcc_data linkdir_wcc;
* };
*
* union LINK3res switch (nfsstat3 status) {
* case NFS3_OK:
* LINK3resok resok;
* default:
* LINK3resfail resfail;
* };
*/
static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
void *data)
{
struct nfs3_linkres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result->dir_attr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/**
* nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
* the local page cache
* @xdr: XDR stream where entry resides
* @entry: buffer to fill in with entry data
* @plus: boolean indicating whether this should be a readdirplus entry
*
* Returns zero if successful, otherwise a negative errno value is
* returned.
*
* This function is not invoked during READDIR reply decoding, but
* rather whenever an application invokes the getdents(2) system call
* on a directory already in our cache.
*
* 3.3.16 entry3
*
* struct entry3 {
* fileid3 fileid;
* filename3 name;
* cookie3 cookie;
* fhandle3 filehandle;
* post_op_attr3 attributes;
* entry3 *nextentry;
* };
*
* 3.3.17 entryplus3
* struct entryplus3 {
* fileid3 fileid;
* filename3 name;
* cookie3 cookie;
* post_op_attr name_attributes;
* post_op_fh3 name_handle;
* entryplus3 *nextentry;
* };
*/
int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
bool plus)
{
struct nfs_entry old = *entry;
__be32 *p;
int error;
u64 new_cookie;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EAGAIN;
if (*p == xdr_zero) {
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EAGAIN;
if (*p == xdr_zero)
return -EAGAIN;
entry->eof = 1;
return -EBADCOOKIE;
}
error = decode_fileid3(xdr, &entry->ino);
if (unlikely(error))
return error;
error = decode_inline_filename3(xdr, &entry->name, &entry->len);
if (unlikely(error))
return error;
error = decode_cookie3(xdr, &new_cookie);
if (unlikely(error))
return error;
entry->d_type = DT_UNKNOWN;
if (plus) {
entry->fattr->valid = 0;
error = decode_post_op_attr(xdr, entry->fattr);
if (unlikely(error))
return error;
if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
if (entry->fattr->fileid != entry->ino) {
entry->fattr->mounted_on_fileid = entry->ino;
entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
}
/* In fact, a post_op_fh3: */
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -EAGAIN;
if (*p != xdr_zero) {
error = decode_nfs_fh3(xdr, entry->fh);
if (unlikely(error)) {
if (error == -E2BIG)
goto out_truncated;
return error;
}
} else
zero_nfs_fh3(entry->fh);
}
entry->prev_cookie = entry->cookie;
entry->cookie = new_cookie;
return 0;
out_truncated:
dprintk("NFS: directory entry contains invalid file handle\n");
*entry = old;
return -EAGAIN;
}
/*
* 3.3.16 READDIR3res
*
* struct dirlist3 {
* entry3 *entries;
* bool eof;
* };
*
* struct READDIR3resok {
* post_op_attr dir_attributes;
* cookieverf3 cookieverf;
* dirlist3 reply;
* };
*
* struct READDIR3resfail {
* post_op_attr dir_attributes;
* };
*
* union READDIR3res switch (nfsstat3 status) {
* case NFS3_OK:
* READDIR3resok resok;
* default:
* READDIR3resfail resfail;
* };
*
* Read the directory contents into the page cache, but otherwise
* don't touch them. The actual decoding is done by nfs3_decode_entry()
* during subsequent nfs_readdir() calls.
*/
static int decode_dirlist3(struct xdr_stream *xdr)
{
return xdr_read_pages(xdr, xdr->buf->page_len);
}
static int decode_readdir3resok(struct xdr_stream *xdr,
struct nfs3_readdirres *result)
{
int error;
error = decode_post_op_attr(xdr, result->dir_attr);
if (unlikely(error))
goto out;
/* XXX: do we need to check if result->verf != NULL ? */
error = decode_cookieverf3(xdr, result->verf);
if (unlikely(error))
goto out;
error = decode_dirlist3(xdr);
out:
return error;
}
static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs3_readdirres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_readdir3resok(xdr, result);
out:
return error;
out_default:
error = decode_post_op_attr(xdr, result->dir_attr);
if (unlikely(error))
goto out;
return nfs3_stat_to_errno(status);
}
/*
* 3.3.18 FSSTAT3res
*
* struct FSSTAT3resok {
* post_op_attr obj_attributes;
* size3 tbytes;
* size3 fbytes;
* size3 abytes;
* size3 tfiles;
* size3 ffiles;
* size3 afiles;
* uint32 invarsec;
* };
*
* struct FSSTAT3resfail {
* post_op_attr obj_attributes;
* };
*
* union FSSTAT3res switch (nfsstat3 status) {
* case NFS3_OK:
* FSSTAT3resok resok;
* default:
* FSSTAT3resfail resfail;
* };
*/
static int decode_fsstat3resok(struct xdr_stream *xdr,
struct nfs_fsstat *result)
{
__be32 *p;
p = xdr_inline_decode(xdr, 8 * 6 + 4);
if (unlikely(!p))
return -EIO;
p = xdr_decode_size3(p, &result->tbytes);
p = xdr_decode_size3(p, &result->fbytes);
p = xdr_decode_size3(p, &result->abytes);
p = xdr_decode_size3(p, &result->tfiles);
p = xdr_decode_size3(p, &result->ffiles);
xdr_decode_size3(p, &result->afiles);
/* ignore invarsec */
return 0;
}
static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs_fsstat *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
error = decode_fsstat3resok(xdr, result);
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.19 FSINFO3res
*
* struct FSINFO3resok {
* post_op_attr obj_attributes;
* uint32 rtmax;
* uint32 rtpref;
* uint32 rtmult;
* uint32 wtmax;
* uint32 wtpref;
* uint32 wtmult;
* uint32 dtpref;
* size3 maxfilesize;
* nfstime3 time_delta;
* uint32 properties;
* };
*
* struct FSINFO3resfail {
* post_op_attr obj_attributes;
* };
*
* union FSINFO3res switch (nfsstat3 status) {
* case NFS3_OK:
* FSINFO3resok resok;
* default:
* FSINFO3resfail resfail;
* };
*/
static int decode_fsinfo3resok(struct xdr_stream *xdr,
struct nfs_fsinfo *result)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
if (unlikely(!p))
return -EIO;
result->rtmax = be32_to_cpup(p++);
result->rtpref = be32_to_cpup(p++);
result->rtmult = be32_to_cpup(p++);
result->wtmax = be32_to_cpup(p++);
result->wtpref = be32_to_cpup(p++);
result->wtmult = be32_to_cpup(p++);
result->dtpref = be32_to_cpup(p++);
p = xdr_decode_size3(p, &result->maxfilesize);
xdr_decode_nfstime3(p, &result->time_delta);
/* ignore properties */
result->lease_time = 0;
return 0;
}
static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs_fsinfo *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
error = decode_fsinfo3resok(xdr, result);
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.20 PATHCONF3res
*
* struct PATHCONF3resok {
* post_op_attr obj_attributes;
* uint32 linkmax;
* uint32 name_max;
* bool no_trunc;
* bool chown_restricted;
* bool case_insensitive;
* bool case_preserving;
* };
*
* struct PATHCONF3resfail {
* post_op_attr obj_attributes;
* };
*
* union PATHCONF3res switch (nfsstat3 status) {
* case NFS3_OK:
* PATHCONF3resok resok;
* default:
* PATHCONF3resfail resfail;
* };
*/
static int decode_pathconf3resok(struct xdr_stream *xdr,
struct nfs_pathconf *result)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4 * 6);
if (unlikely(!p))
return -EIO;
result->max_link = be32_to_cpup(p++);
result->max_namelen = be32_to_cpup(p);
/* ignore remaining fields */
return 0;
}
static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs_pathconf *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_status;
error = decode_pathconf3resok(xdr, result);
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
/*
* 3.3.21 COMMIT3res
*
* struct COMMIT3resok {
* wcc_data file_wcc;
* writeverf3 verf;
* };
*
* struct COMMIT3resfail {
* wcc_data file_wcc;
* };
*
* union COMMIT3res switch (nfsstat3 status) {
* case NFS3_OK:
* COMMIT3resok resok;
* default:
* COMMIT3resfail resfail;
* };
*/
static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *data)
{
struct nfs_commitres *result = data;
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
error = decode_wcc_data(xdr, result->fattr);
if (unlikely(error))
goto out;
result->op_status = status;
if (status != NFS3_OK)
goto out_status;
error = decode_writeverf3(xdr, &result->verf->verifier);
out:
return error;
out_status:
return nfs3_stat_to_errno(status);
}
#ifdef CONFIG_NFS_V3_ACL
static inline int decode_getacl3resok(struct xdr_stream *xdr,
struct nfs3_getaclres *result)
{
struct posix_acl **acl;
unsigned int *aclcnt;
size_t hdrlen;
int error;
error = decode_post_op_attr(xdr, result->fattr);
if (unlikely(error))
goto out;
error = decode_uint32(xdr, &result->mask);
if (unlikely(error))
goto out;
error = -EINVAL;
if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
goto out;
hdrlen = xdr_stream_pos(xdr);
acl = NULL;
if (result->mask & NFS_ACL)
acl = &result->acl_access;
aclcnt = NULL;
if (result->mask & NFS_ACLCNT)
aclcnt = &result->acl_access_count;
error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
if (unlikely(error <= 0))
goto out;
acl = NULL;
if (result->mask & NFS_DFACL)
acl = &result->acl_default;
aclcnt = NULL;
if (result->mask & NFS_DFACLCNT)
aclcnt = &result->acl_default_count;
error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
if (unlikely(error <= 0))
return error;
error = 0;
out:
return error;
}
static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *result)
{
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_getacl3resok(xdr, result);
out:
return error;
out_default:
return nfs3_stat_to_errno(status);
}
static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
void *result)
{
enum nfs_stat status;
int error;
error = decode_nfsstat3(xdr, &status);
if (unlikely(error))
goto out;
if (status != NFS3_OK)
goto out_default;
error = decode_post_op_attr(xdr, result);
out:
return error;
out_default:
return nfs3_stat_to_errno(status);
}
#endif /* CONFIG_NFS_V3_ACL */
/*
* We need to translate between nfs status return values and
* the local errno values which may not be the same.
*/
static const struct {
int stat;
int errno;
} nfs_errtbl[] = {
{ NFS_OK, 0 },
{ NFSERR_PERM, -EPERM },
{ NFSERR_NOENT, -ENOENT },
{ NFSERR_IO, -errno_NFSERR_IO},
{ NFSERR_NXIO, -ENXIO },
/* { NFSERR_EAGAIN, -EAGAIN }, */
{ NFSERR_ACCES, -EACCES },
{ NFSERR_EXIST, -EEXIST },
{ NFSERR_XDEV, -EXDEV },
{ NFSERR_NODEV, -ENODEV },
{ NFSERR_NOTDIR, -ENOTDIR },
{ NFSERR_ISDIR, -EISDIR },
{ NFSERR_INVAL, -EINVAL },
{ NFSERR_FBIG, -EFBIG },
{ NFSERR_NOSPC, -ENOSPC },
{ NFSERR_ROFS, -EROFS },
{ NFSERR_MLINK, -EMLINK },
{ NFSERR_NAMETOOLONG, -ENAMETOOLONG },
{ NFSERR_NOTEMPTY, -ENOTEMPTY },
{ NFSERR_DQUOT, -EDQUOT },
{ NFSERR_STALE, -ESTALE },
{ NFSERR_REMOTE, -EREMOTE },
#ifdef EWFLUSH
{ NFSERR_WFLUSH, -EWFLUSH },
#endif
{ NFSERR_BADHANDLE, -EBADHANDLE },
{ NFSERR_NOT_SYNC, -ENOTSYNC },
{ NFSERR_BAD_COOKIE, -EBADCOOKIE },
{ NFSERR_NOTSUPP, -ENOTSUPP },
{ NFSERR_TOOSMALL, -ETOOSMALL },
{ NFSERR_SERVERFAULT, -EREMOTEIO },
{ NFSERR_BADTYPE, -EBADTYPE },
{ NFSERR_JUKEBOX, -EJUKEBOX },
{ -1, -EIO }
};
/**
* nfs3_stat_to_errno - convert an NFS status code to a local errno
* @status: NFS status code to convert
*
* Returns a local errno value, or -EIO if the NFS status code is
* not recognized. This function is used jointly by NFSv2 and NFSv3.
*/
static int nfs3_stat_to_errno(enum nfs_stat status)
{
int i;
for (i = 0; nfs_errtbl[i].stat != -1; i++) {
if (nfs_errtbl[i].stat == (int)status)
return nfs_errtbl[i].errno;
}
dprintk("NFS: Unrecognized nfs status value: %u\n", status);
return nfs_errtbl[i].errno;
}
#define PROC(proc, argtype, restype, timer) \
[NFS3PROC_##proc] = { \
.p_proc = NFS3PROC_##proc, \
.p_encode = nfs3_xdr_enc_##argtype##3args, \
.p_decode = nfs3_xdr_dec_##restype##3res, \
.p_arglen = NFS3_##argtype##args_sz, \
.p_replen = NFS3_##restype##res_sz, \
.p_timer = timer, \
.p_statidx = NFS3PROC_##proc, \
.p_name = #proc, \
}
const struct rpc_procinfo nfs3_procedures[] = {
PROC(GETATTR, getattr, getattr, 1),
PROC(SETATTR, setattr, setattr, 0),
PROC(LOOKUP, lookup, lookup, 2),
PROC(ACCESS, access, access, 1),
PROC(READLINK, readlink, readlink, 3),
PROC(READ, read, read, 3),
PROC(WRITE, write, write, 4),
PROC(CREATE, create, create, 0),
PROC(MKDIR, mkdir, create, 0),
PROC(SYMLINK, symlink, create, 0),
PROC(MKNOD, mknod, create, 0),
PROC(REMOVE, remove, remove, 0),
PROC(RMDIR, lookup, setattr, 0),
PROC(RENAME, rename, rename, 0),
PROC(LINK, link, link, 0),
PROC(READDIR, readdir, readdir, 3),
PROC(READDIRPLUS, readdirplus, readdir, 3),
PROC(FSSTAT, getattr, fsstat, 0),
PROC(FSINFO, getattr, fsinfo, 0),
PROC(PATHCONF, getattr, pathconf, 0),
PROC(COMMIT, commit, commit, 5),
};
static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
const struct rpc_version nfs_version3 = {
.number = 3,
.nrprocs = ARRAY_SIZE(nfs3_procedures),
.procs = nfs3_procedures,
.counts = nfs_version3_counts,
};
#ifdef CONFIG_NFS_V3_ACL
static const struct rpc_procinfo nfs3_acl_procedures[] = {
[ACLPROC3_GETACL] = {
.p_proc = ACLPROC3_GETACL,
.p_encode = nfs3_xdr_enc_getacl3args,
.p_decode = nfs3_xdr_dec_getacl3res,
.p_arglen = ACL3_getaclargs_sz,
.p_replen = ACL3_getaclres_sz,
.p_timer = 1,
.p_name = "GETACL",
},
[ACLPROC3_SETACL] = {
.p_proc = ACLPROC3_SETACL,
.p_encode = nfs3_xdr_enc_setacl3args,
.p_decode = nfs3_xdr_dec_setacl3res,
.p_arglen = ACL3_setaclargs_sz,
.p_replen = ACL3_setaclres_sz,
.p_timer = 0,
.p_name = "SETACL",
},
};
static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
const struct rpc_version nfsacl_version3 = {
.number = 3,
.nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
.procs = nfs3_acl_procedures,
.counts = nfs3_acl_counts,
};
#endif /* CONFIG_NFS_V3_ACL */
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