openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
linux/fs/nfs/nfs3xdr.c

2499 lines
53 KiB
C
Raw Blame History

/*
* 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 "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)
#define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3)
#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)
#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))
#define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
/*
* 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,
};
/*
* While encoding arguments, set up the reply buffer in advance to
* receive reply data directly into the page cache.
*/
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
unsigned int base, unsigned int len,
unsigned int bufsize)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}
/*
* Handle decode buffer overflows out-of-line.
*/
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
dprintk("NFS: %s prematurely hit the end of our receive buffer. "
"Remaining buffer length is %tu words.\n",
func, xdr->end - xdr->p);
}
/*
* 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 == NULL))
goto out_overflow;
*value = be32_to_cpup(p);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int decode_uint64(struct xdr_stream *xdr, u64 *value)
{
__be32 *p;
p = xdr_inline_decode(xdr, 8);
if (unlikely(p == NULL))
goto out_overflow;
xdr_decode_hyper(p, value);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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;
BUG_ON(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 == NULL))
goto out_overflow;
count = be32_to_cpup(p);
if (count > NFS3_MAXNAMLEN)
goto out_nametoolong;
p = xdr_inline_decode(xdr, count);
if (unlikely(p == NULL))
goto out_overflow;
*name = (const char *)p;
*length = count;
return 0;
out_nametoolong:
dprintk("NFS: returned filename too long: %u\n", count);
return -ENAMETOOLONG;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* nfspath3
*
* typedef string nfspath3<>;
*/
static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
const u32 length)
{
BUG_ON(length > NFS3_MAXPATHLEN);
encode_uint32(xdr, length);
xdr_write_pages(xdr, pages, 0, length);
}
static int decode_nfspath3(struct xdr_stream *xdr)
{
u32 recvd, count;
size_t hdrlen;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
count = be32_to_cpup(p);
if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
goto out_nametoolong;
hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
recvd = xdr->buf->len - hdrlen;
if (unlikely(count > recvd))
goto out_cheating;
xdr_read_pages(xdr, count);
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;
out_overflow:
print_overflow_msg(__func__, xdr);
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 == NULL))
goto out_overflow;
memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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, __be32 *verifier)
{
__be32 *p;
p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
if (unlikely(p == NULL))
goto out_overflow;
memcpy(verifier, p, NFS3_WRITEVERFSIZE);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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 == NULL))
goto out_overflow;
*status = be32_to_cpup(p);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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)
{
BUG_ON(type > NF3FIFO);
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;
BUG_ON(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 == NULL))
goto out_overflow;
length = be32_to_cpup(p++);
if (unlikely(length > NFS3_FHSIZE))
goto out_toobig;
p = xdr_inline_decode(xdr, length);
if (unlikely(p == NULL))
goto out_overflow;
fh->size = length;
memcpy(fh->data, p, length);
return 0;
out_toobig:
dprintk("NFS: file handle size (%u) too big\n", length);
return -E2BIG;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
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)
{
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(attr->ia_uid);
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_GID) {
*p++ = xdr_one;
*p++ = cpu_to_be32(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) {
*p++ = xdr_two;
p = xdr_encode_nfstime3(p, &attr->ia_atime);
} else if (attr->ia_valid & ATTR_ATIME) {
*p++ = xdr_one;
} else
*p++ = xdr_zero;
if (attr->ia_valid & ATTR_MTIME_SET) {
*p++ = xdr_two;
xdr_encode_nfstime3(p, &attr->ia_mtime);
} 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 == NULL))
goto out_overflow;
p = xdr_decode_ftype3(p, &fmode);
fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
fattr->nlink = be32_to_cpup(p++);
fattr->uid = be32_to_cpup(p++);
fattr->gid = be32_to_cpup(p++);
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->valid |= NFS_ATTR_FATTR_V3;
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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 == NULL))
goto out_overflow;
if (*p != xdr_zero)
return decode_fattr3(xdr, fattr);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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 == NULL))
goto out_overflow;
fattr->valid |= NFS_ATTR_FATTR_PRESIZE
| 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);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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 == NULL))
goto out_overflow;
if (*p != xdr_zero)
return decode_wcc_attr(xdr, fattr);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
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 == NULL))
goto out_overflow;
if (*p != xdr_zero)
return decode_nfs_fh3(xdr, fh);
zero_nfs_fh3(fh);
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 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 struct nfs_fh *fh)
{
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 struct nfs3_sattrargs *args)
{
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 struct nfs3_diropargs *args)
{
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 struct nfs3_accessargs *args)
{
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 struct nfs3_readlinkargs *args)
{
encode_nfs_fh3(xdr, args->fh);
prepare_reply_buffer(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_readargs *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 struct nfs_readargs *args)
{
encode_read3args(xdr, args);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->count, NFS3_readres_sz);
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_writeargs *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 struct nfs_writeargs *args)
{
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 struct nfs3_createargs *args)
{
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 struct nfs3_mkdirargs *args)
{
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 struct nfs3_symlinkargs *args)
{
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 struct nfs3_symlinkargs *args)
{
encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
encode_symlinkdata3(xdr, args);
}
/*
* 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 struct nfs3_mknodargs *args)
{
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 struct nfs_removeargs *args)
{
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 struct nfs_renameargs *args)
{
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 struct nfs3_linkargs *args)
{
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 struct nfs3_readdirargs *args)
{
encode_readdir3args(xdr, args);
prepare_reply_buffer(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 struct nfs3_readdirargs *args)
{
encode_readdirplus3args(xdr, args);
prepare_reply_buffer(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_writeargs *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 struct nfs_writeargs *args)
{
encode_commit3args(xdr, args);
}
#ifdef CONFIG_NFS_V3_ACL
static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const struct nfs3_getaclargs *args)
{
encode_nfs_fh3(xdr, args->fh);
encode_uint32(xdr, args->mask);
if (args->mask & (NFS_ACL | NFS_DFACL))
prepare_reply_buffer(req, args->pages, 0,
NFSACL_MAXPAGES << PAGE_SHIFT,
ACL3_getaclres_sz);
}
static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
struct xdr_stream *xdr,
const struct nfs3_setaclargs *args)
{
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, NFS_ACL_INLINE_BUFSIZE);
error = nfsacl_encode(xdr->buf, base, args->inode,
(args->mask & NFS_ACL) ?
args->acl_access : NULL, 1, 0);
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,
struct nfs_fattr *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 nfs_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,
struct nfs_fattr *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 nfs_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,
struct nfs3_diropres *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_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 nfs_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,
struct nfs3_accessres *result)
{
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 nfs_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,
struct nfs_fattr *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 nfs_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_readres *result)
{
u32 eof, count, ocount, recvd;
size_t hdrlen;
__be32 *p;
p = xdr_inline_decode(xdr, 4 + 4 + 4);
if (unlikely(p == NULL))
goto out_overflow;
count = be32_to_cpup(p++);
eof = be32_to_cpup(p++);
ocount = be32_to_cpup(p++);
if (unlikely(ocount != count))
goto out_mismatch;
hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
recvd = xdr->buf->len - hdrlen;
if (unlikely(count > recvd))
goto out_cheating;
out:
xdr_read_pages(xdr, count);
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;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
struct nfs_readres *result)
{
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_read3resok(xdr, result);
out:
return error;
out_status:
return nfs_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_writeres *result)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4 + 4 + NFS3_WRITEVERFSIZE);
if (unlikely(p == NULL))
goto out_overflow;
result->count = be32_to_cpup(p++);
result->verf->committed = be32_to_cpup(p++);
if (unlikely(result->verf->committed > NFS_FILE_SYNC))
goto out_badvalue;
memcpy(result->verf->verifier, p, NFS3_WRITEVERFSIZE);
return result->count;
out_badvalue:
dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
return -EIO;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
struct nfs_writeres *result)
{
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;
if (status != NFS3_OK)
goto out_status;
error = decode_write3resok(xdr, result);
out:
return error;
out_status:
return nfs_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,
struct nfs3_diropres *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_create3resok(xdr, result);
out:
return error;
out_default:
error = decode_wcc_data(xdr, result->dir_attr);
if (unlikely(error))
goto out;
return nfs_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,
struct nfs_removeres *result)
{
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 nfs_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,
struct nfs_renameres *result)
{
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 nfs_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,
struct nfs3_linkres *result)
{
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 nfs_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,
int plus)
{
struct nfs_entry old = *entry;
__be32 *p;
int error;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
if (*p == xdr_zero) {
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
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;
entry->prev_cookie = entry->cookie;
error = decode_cookie3(xdr, &entry->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);
/* In fact, a post_op_fh3: */
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
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);
}
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EAGAIN;
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)
{
u32 recvd, pglen;
size_t hdrlen;
pglen = xdr->buf->page_len;
hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
recvd = xdr->buf->len - hdrlen;
if (unlikely(pglen > recvd))
goto out_cheating;
out:
xdr_read_pages(xdr, pglen);
return pglen;
out_cheating:
dprintk("NFS: server cheating in readdir result: "
"pglen %u > recvd %u\n", pglen, recvd);
pglen = recvd;
goto out;
}
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,
struct nfs3_readdirres *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_readdir3resok(xdr, result);
out:
return error;
out_default:
error = decode_post_op_attr(xdr, result->dir_attr);
if (unlikely(error))
goto out;
return nfs_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 == NULL))
goto out_overflow;
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;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
struct nfs_fsstat *result)
{
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 nfs_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 == NULL))
goto out_overflow;
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;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
struct nfs_fsinfo *result)
{
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 nfs_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 == NULL))
goto out_overflow;
result->max_link = be32_to_cpup(p++);
result->max_namelen = be32_to_cpup(p);
/* ignore remaining fields */
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
struct nfs_pathconf *result)
{
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 nfs_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,
struct nfs_writeres *result)
{
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;
if (status != NFS3_OK)
goto out_status;
error = decode_writeverf3(xdr, result->verf->verifier);
out:
return error;
out_status:
return nfs_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 = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
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,
struct nfs3_getaclres *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 nfs_stat_to_errno(status);
}
static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
struct xdr_stream *xdr,
struct nfs_fattr *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 nfs_stat_to_errno(status);
}
#endif /* CONFIG_NFS_V3_ACL */
#define PROC(proc, argtype, restype, timer) \
[NFS3PROC_##proc] = { \
.p_proc = NFS3PROC_##proc, \
.p_encode = (kxdreproc_t)nfs3_xdr_enc_##argtype##3args, \
.p_decode = (kxdrdproc_t)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, \
}
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),
};
const struct rpc_version nfs_version3 = {
.number = 3,
.nrprocs = ARRAY_SIZE(nfs3_procedures),
.procs = nfs3_procedures
};
#ifdef CONFIG_NFS_V3_ACL
static struct rpc_procinfo nfs3_acl_procedures[] = {
[ACLPROC3_GETACL] = {
.p_proc = ACLPROC3_GETACL,
.p_encode = (kxdreproc_t)nfs3_xdr_enc_getacl3args,
.p_decode = (kxdrdproc_t)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 = (kxdreproc_t)nfs3_xdr_enc_setacl3args,
.p_decode = (kxdrdproc_t)nfs3_xdr_dec_setacl3res,
.p_arglen = ACL3_setaclargs_sz,
.p_replen = ACL3_setaclres_sz,
.p_timer = 0,
.p_name = "SETACL",
},
};
const struct rpc_version nfsacl_version3 = {
.number = 3,
.nrprocs = sizeof(nfs3_acl_procedures)/
sizeof(nfs3_acl_procedures[0]),
.procs = nfs3_acl_procedures,
};
#endif /* CONFIG_NFS_V3_ACL */
Reference in New Issue View Git Blame Copy Permalink