linux/fs/nfsd/nfs4proc.c

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/*
* fs/nfsd/nfs4proc.c
*
* Server-side procedures for NFSv4.
*
* Copyright (c) 2002 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <andros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Note: some routines in this file are just trivial wrappers
* (e.g. nfsd4_lookup()) defined solely for the sake of consistent
* naming. Since all such routines have been declared "inline",
* there shouldn't be any associated overhead. At some point in
* the future, I might inline these "by hand" to clean up a
* little.
*/
#include <linux/param.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/nfs4_acl.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
static inline void
fh_dup2(struct svc_fh *dst, struct svc_fh *src)
{
fh_put(dst);
dget(src->fh_dentry);
if (src->fh_export)
cache_get(&src->fh_export->h);
*dst = *src;
}
static __be32
do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
{
__be32 status;
if (open->op_truncate &&
!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
return nfserr_inval;
if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
accmode |= MAY_READ;
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
accmode |= (MAY_WRITE | MAY_TRUNC);
if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
accmode |= MAY_WRITE;
status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
return status;
}
static __be32
do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
struct svc_fh resfh;
__be32 status;
int created = 0;
fh_init(&resfh, NFS4_FHSIZE);
open->op_truncate = 0;
if (open->op_create) {
/*
* Note: create modes (UNCHECKED,GUARDED...) are the same
* in NFSv4 as in v3.
*/
status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
open->op_fname.len, &open->op_iattr,
&resfh, open->op_createmode,
(u32 *)open->op_verf.data, &open->op_truncate, &created);
} else {
status = nfsd_lookup(rqstp, current_fh,
open->op_fname.data, open->op_fname.len, &resfh);
fh_unlock(current_fh);
}
if (status)
goto out;
set_change_info(&open->op_cinfo, current_fh);
/* set reply cache */
fh_dup2(current_fh, &resfh);
open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
memcpy(open->op_stateowner->so_replay.rp_openfh,
&resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
if (!created)
status = do_open_permission(rqstp, current_fh, open, MAY_NOP);
out:
fh_put(&resfh);
return status;
}
static __be32
do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
__be32 status;
/* Only reclaims from previously confirmed clients are valid */
if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
return status;
/* We don't know the target directory, and therefore can not
* set the change info
*/
memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
/* set replay cache */
open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
memcpy(open->op_stateowner->so_replay.rp_openfh,
&current_fh->fh_handle.fh_base,
current_fh->fh_handle.fh_size);
open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
(open->op_iattr.ia_size == 0);
status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE);
return status;
}
static inline __be32
nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, struct nfs4_stateowner **replay_owner)
{
__be32 status;
dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
(int)open->op_fname.len, open->op_fname.data,
open->op_stateowner);
/* This check required by spec. */
if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
return nfserr_inval;
nfs4_lock_state();
/* check seqid for replay. set nfs4_owner */
status = nfsd4_process_open1(open);
if (status == nfserr_replay_me) {
struct nfs4_replay *rp = &open->op_stateowner->so_replay;
fh_put(current_fh);
current_fh->fh_handle.fh_size = rp->rp_openfh_len;
memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
rp->rp_openfh_len);
status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
if (status)
dprintk("nfsd4_open: replay failed"
" restoring previous filehandle\n");
else
status = nfserr_replay_me;
}
if (status)
goto out;
/* Openowner is now set, so sequence id will get bumped. Now we need
* these checks before we do any creates: */
status = nfserr_grace;
if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
goto out;
status = nfserr_no_grace;
if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
goto out;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
status = nfserr_inval;
if (open->op_create)
goto out;
/* fall through */
case NFS4_OPEN_CLAIM_NULL:
/*
* (1) set CURRENT_FH to the file being opened,
* creating it if necessary, (2) set open->op_cinfo,
* (3) set open->op_truncate if the file is to be
* truncated after opening, (4) do permission checking.
*/
status = do_open_lookup(rqstp, current_fh, open);
if (status)
goto out;
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
open->op_stateowner->so_confirmed = 1;
/*
* The CURRENT_FH is already set to the file being
* opened. (1) set open->op_cinfo, (2) set
* open->op_truncate if the file is to be truncated
* after opening, (3) do permission checking.
*/
status = do_open_fhandle(rqstp, current_fh, open);
if (status)
goto out;
break;
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
open->op_stateowner->so_confirmed = 1;
printk("NFSD: unsupported OPEN claim type %d\n",
open->op_claim_type);
status = nfserr_notsupp;
goto out;
default:
printk("NFSD: Invalid OPEN claim type %d\n",
open->op_claim_type);
status = nfserr_inval;
goto out;
}
/*
* nfsd4_process_open2() does the actual opening of the file. If
* successful, it (1) truncates the file if open->op_truncate was
* set, (2) sets open->op_stateid, (3) sets open->op_delegation.
*/
status = nfsd4_process_open2(rqstp, current_fh, open);
out:
if (open->op_stateowner) {
nfs4_get_stateowner(open->op_stateowner);
*replay_owner = open->op_stateowner;
}
nfs4_unlock_state();
return status;
}
/*
* filehandle-manipulating ops.
*/
static inline __be32
nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
{
if (!current_fh->fh_dentry)
return nfserr_nofilehandle;
*getfh = current_fh;
return nfs_ok;
}
static inline __be32
nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
{
fh_put(current_fh);
current_fh->fh_handle.fh_size = putfh->pf_fhlen;
memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
return fh_verify(rqstp, current_fh, 0, MAY_NOP);
}
static inline __be32
nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
{
__be32 status;
fh_put(current_fh);
status = exp_pseudoroot(rqstp->rq_client, current_fh,
&rqstp->rq_chandle);
return status;
}
static inline __be32
nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
{
if (!save_fh->fh_dentry)
return nfserr_restorefh;
fh_dup2(current_fh, save_fh);
return nfs_ok;
}
static inline __be32
nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
{
if (!current_fh->fh_dentry)
return nfserr_nofilehandle;
fh_dup2(save_fh, current_fh);
return nfs_ok;
}
/*
* misc nfsv4 ops
*/
static inline __be32
nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
{
if (access->ac_req_access & ~NFS3_ACCESS_FULL)
return nfserr_inval;
access->ac_resp_access = access->ac_req_access;
return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
}
static inline __be32
nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
{
__be32 status;
u32 *p = (u32 *)commit->co_verf.data;
*p++ = nfssvc_boot.tv_sec;
*p++ = nfssvc_boot.tv_usec;
status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
if (status == nfserr_symlink)
status = nfserr_inval;
return status;
}
static __be32
nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
{
struct svc_fh resfh;
__be32 status;
dev_t rdev;
fh_init(&resfh, NFS4_FHSIZE);
status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
if (status == nfserr_symlink)
status = nfserr_notdir;
if (status)
return status;
switch (create->cr_type) {
case NF4LNK:
/* ugh! we have to null-terminate the linktext, or
* vfs_symlink() will choke. it is always safe to
* null-terminate by brute force, since at worst we
* will overwrite the first byte of the create namelen
* in the XDR buffer, which has already been extracted
* during XDR decode.
*/
create->cr_linkname[create->cr_linklen] = 0;
status = nfsd_symlink(rqstp, current_fh, create->cr_name,
create->cr_namelen, create->cr_linkname,
create->cr_linklen, &resfh, &create->cr_iattr);
break;
case NF4BLK:
rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
if (MAJOR(rdev) != create->cr_specdata1 ||
MINOR(rdev) != create->cr_specdata2)
return nfserr_inval;
status = nfsd_create(rqstp, current_fh, create->cr_name,
create->cr_namelen, &create->cr_iattr,
S_IFBLK, rdev, &resfh);
break;
case NF4CHR:
rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
if (MAJOR(rdev) != create->cr_specdata1 ||
MINOR(rdev) != create->cr_specdata2)
return nfserr_inval;
status = nfsd_create(rqstp, current_fh, create->cr_name,
create->cr_namelen, &create->cr_iattr,
S_IFCHR, rdev, &resfh);
break;
case NF4SOCK:
status = nfsd_create(rqstp, current_fh, create->cr_name,
create->cr_namelen, &create->cr_iattr,
S_IFSOCK, 0, &resfh);
break;
case NF4FIFO:
status = nfsd_create(rqstp, current_fh, create->cr_name,
create->cr_namelen, &create->cr_iattr,
S_IFIFO, 0, &resfh);
break;
case NF4DIR:
create->cr_iattr.ia_valid &= ~ATTR_SIZE;
status = nfsd_create(rqstp, current_fh, create->cr_name,
create->cr_namelen, &create->cr_iattr,
S_IFDIR, 0, &resfh);
break;
default:
status = nfserr_badtype;
}
if (!status) {
fh_unlock(current_fh);
set_change_info(&create->cr_cinfo, current_fh);
fh_dup2(current_fh, &resfh);
}
fh_put(&resfh);
return status;
}
static inline __be32
nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
{
__be32 status;
status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
if (status)
return status;
if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
return nfserr_inval;
getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
getattr->ga_fhp = current_fh;
return nfs_ok;
}
static inline __be32
nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
struct svc_fh *save_fh, struct nfsd4_link *link)
{
__be32 status = nfserr_nofilehandle;
if (!save_fh->fh_dentry)
return status;
status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
if (!status)
set_change_info(&link->li_cinfo, current_fh);
return status;
}
static __be32
nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
{
struct svc_fh tmp_fh;
__be32 ret;
fh_init(&tmp_fh, NFS4_FHSIZE);
if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
&rqstp->rq_chandle)) != 0)
return ret;
if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
fh_put(&tmp_fh);
return nfserr_noent;
}
fh_put(&tmp_fh);
return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
}
static inline __be32
nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
{
return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
}
static inline __be32
nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
{
__be32 status;
/* no need to check permission - this will be done in nfsd_read() */
read->rd_filp = NULL;
if (read->rd_offset >= OFFSET_MAX)
return nfserr_inval;
nfs4_lock_state();
/* check stateid */
if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
CHECK_FH | RD_STATE, &read->rd_filp))) {
dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
goto out;
}
if (read->rd_filp)
get_file(read->rd_filp);
status = nfs_ok;
out:
nfs4_unlock_state();
read->rd_rqstp = rqstp;
read->rd_fhp = current_fh;
return status;
}
static inline __be32
nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
{
u64 cookie = readdir->rd_cookie;
static const nfs4_verifier zeroverf;
/* no need to check permission - this will be done in nfsd_readdir() */
if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
return nfserr_inval;
readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
(cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
return nfserr_bad_cookie;
readdir->rd_rqstp = rqstp;
readdir->rd_fhp = current_fh;
return nfs_ok;
}
static inline __be32
nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
{
readlink->rl_rqstp = rqstp;
readlink->rl_fhp = current_fh;
return nfs_ok;
}
static inline __be32
nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
{
__be32 status;
if (nfs4_in_grace())
return nfserr_grace;
status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
if (status == nfserr_symlink)
return nfserr_notdir;
if (!status) {
fh_unlock(current_fh);
set_change_info(&remove->rm_cinfo, current_fh);
}
return status;
}
static inline __be32
nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
struct svc_fh *save_fh, struct nfsd4_rename *rename)
{
__be32 status = nfserr_nofilehandle;
if (!save_fh->fh_dentry)
return status;
if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
& NFSEXP_NOSUBTREECHECK))
return nfserr_grace;
status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
rename->rn_snamelen, current_fh,
rename->rn_tname, rename->rn_tnamelen);
/* the underlying filesystem returns different error's than required
* by NFSv4. both save_fh and current_fh have been verified.. */
if (status == nfserr_isdir)
status = nfserr_exist;
else if ((status == nfserr_notdir) &&
(S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
status = nfserr_exist;
else if (status == nfserr_symlink)
status = nfserr_notdir;
if (!status) {
set_change_info(&rename->rn_sinfo, current_fh);
set_change_info(&rename->rn_tinfo, save_fh);
}
return status;
}
static inline __be32
nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
{
__be32 status = nfs_ok;
if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
nfs4_lock_state();
status = nfs4_preprocess_stateid_op(current_fh,
&setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
nfs4_unlock_state();
if (status) {
dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
return status;
}
}
status = nfs_ok;
if (setattr->sa_acl != NULL)
status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
if (status)
return status;
status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
0, (time_t)0);
return status;
}
static inline __be32
nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
{
stateid_t *stateid = &write->wr_stateid;
struct file *filp = NULL;
u32 *p;
__be32 status = nfs_ok;
/* no need to check permission - this will be done in nfsd_write() */
if (write->wr_offset >= OFFSET_MAX)
return nfserr_inval;
nfs4_lock_state();
status = nfs4_preprocess_stateid_op(current_fh, stateid,
CHECK_FH | WR_STATE, &filp);
if (filp)
get_file(filp);
nfs4_unlock_state();
if (status) {
dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
return status;
}
write->wr_bytes_written = write->wr_buflen;
write->wr_how_written = write->wr_stable_how;
p = (u32 *)write->wr_verifier.data;
*p++ = nfssvc_boot.tv_sec;
*p++ = nfssvc_boot.tv_usec;
status = nfsd_write(rqstp, current_fh, filp, write->wr_offset,
rqstp->rq_vec, write->wr_vlen, write->wr_buflen,
&write->wr_how_written);
if (filp)
fput(filp);
if (status == nfserr_symlink)
status = nfserr_inval;
return status;
}
/* This routine never returns NFS_OK! If there are no other errors, it
* will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
* attributes matched. VERIFY is implemented by mapping NFSERR_SAME
* to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
*/
static __be32
nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
{
__be32 *buf, *p;
int count;
__be32 status;
status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
if (status)
return status;
if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
|| (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
return nfserr_attrnotsupp;
if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
|| (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
return nfserr_inval;
if (verify->ve_attrlen & 3)
return nfserr_inval;
/* count in words:
* bitmap_len(1) + bitmap(2) + attr_len(1) = 4
*/
count = 4 + (verify->ve_attrlen >> 2);
buf = kmalloc(count << 2, GFP_KERNEL);
if (!buf)
return nfserr_resource;
status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
current_fh->fh_dentry, buf,
&count, verify->ve_bmval,
rqstp);
/* this means that nfsd4_encode_fattr() ran out of space */
if (status == nfserr_resource && count == 0)
status = nfserr_not_same;
if (status)
goto out_kfree;
p = buf + 3;
status = nfserr_not_same;
if (ntohl(*p++) != verify->ve_attrlen)
goto out_kfree;
if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
status = nfserr_same;
out_kfree:
kfree(buf);
return status;
}
/*
* NULL call.
*/
static __be32
nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
return nfs_ok;
}
static inline void nfsd4_increment_op_stats(u32 opnum)
{
if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
nfsdstats.nfs4_opcount[opnum]++;
}
/*
* COMPOUND call.
*/
static __be32
nfsd4_proc_compound(struct svc_rqst *rqstp,
struct nfsd4_compoundargs *args,
struct nfsd4_compoundres *resp)
{
struct nfsd4_op *op;
struct svc_fh *current_fh = NULL;
struct svc_fh *save_fh = NULL;
struct nfs4_stateowner *replay_owner = NULL;
int slack_space; /* in words, not bytes! */
__be32 status;
status = nfserr_resource;
current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
if (current_fh == NULL)
goto out;
fh_init(current_fh, NFS4_FHSIZE);
save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
if (save_fh == NULL)
goto out;
fh_init(save_fh, NFS4_FHSIZE);
resp->xbuf = &rqstp->rq_res;
resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
resp->tagp = resp->p;
/* reserve space for: taglen, tag, and opcnt */
resp->p += 2 + XDR_QUADLEN(args->taglen);
resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
resp->taglen = args->taglen;
resp->tag = args->tag;
resp->opcnt = 0;
resp->rqstp = rqstp;
/*
* According to RFC3010, this takes precedence over all other errors.
*/
status = nfserr_minor_vers_mismatch;
if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
goto out;
status = nfs_ok;
while (!status && resp->opcnt < args->opcnt) {
op = &args->ops[resp->opcnt++];
dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
/*
* The XDR decode routines may have pre-set op->status;
* for example, if there is a miscellaneous XDR error
* it will be set to nfserr_bad_xdr.
*/
if (op->status)
goto encode_op;
/* We must be able to encode a successful response to
* this operation, with enough room left over to encode a
* failed response to the next operation. If we don't
* have enough room, fail with ERR_RESOURCE.
*/
/* FIXME - is slack_space *really* words, or bytes??? - neilb */
slack_space = (char *)resp->end - (char *)resp->p;
if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
op->status = nfserr_resource;
goto encode_op;
}
/* All operations except RENEW, SETCLIENTID, RESTOREFH
* SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
* require a valid current filehandle
*/
if (!current_fh->fh_dentry) {
if (!((op->opnum == OP_PUTFH) ||
(op->opnum == OP_PUTROOTFH) ||
(op->opnum == OP_SETCLIENTID) ||
(op->opnum == OP_SETCLIENTID_CONFIRM) ||
(op->opnum == OP_RENEW) ||
(op->opnum == OP_RESTOREFH) ||
(op->opnum == OP_RELEASE_LOCKOWNER))) {
op->status = nfserr_nofilehandle;
goto encode_op;
}
}
/* Check must be done at start of each operation, except
* for GETATTR and ops not listed as returning NFS4ERR_MOVED
*/
else if (current_fh->fh_export->ex_fslocs.migrated &&
!((op->opnum == OP_GETATTR) ||
(op->opnum == OP_PUTROOTFH) ||
(op->opnum == OP_PUTPUBFH) ||
(op->opnum == OP_RENEW) ||
(op->opnum == OP_SETCLIENTID) ||
(op->opnum == OP_RELEASE_LOCKOWNER))) {
op->status = nfserr_moved;
goto encode_op;
}
switch (op->opnum) {
case OP_ACCESS:
op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
break;
case OP_CLOSE:
op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
break;
case OP_COMMIT:
op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
break;
case OP_CREATE:
op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
break;
case OP_DELEGRETURN:
op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
break;
case OP_GETATTR:
op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
break;
case OP_GETFH:
op->status = nfsd4_getfh(current_fh, &op->u.getfh);
break;
case OP_LINK:
op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
break;
case OP_LOCK:
op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
break;
case OP_LOCKT:
op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
break;
case OP_LOCKU:
op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner);
break;
case OP_LOOKUP:
op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
break;
case OP_LOOKUPP:
op->status = nfsd4_lookupp(rqstp, current_fh);
break;
case OP_NVERIFY:
op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
if (op->status == nfserr_not_same)
op->status = nfs_ok;
break;
case OP_OPEN:
op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner);
break;
case OP_OPEN_CONFIRM:
op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
break;
case OP_OPEN_DOWNGRADE:
op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
break;
case OP_PUTFH:
op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
break;
case OP_PUTROOTFH:
op->status = nfsd4_putrootfh(rqstp, current_fh);
break;
case OP_READ:
op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
break;
case OP_READDIR:
op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
break;
case OP_READLINK:
op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
break;
case OP_REMOVE:
op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
break;
case OP_RENAME:
op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
break;
case OP_RENEW:
op->status = nfsd4_renew(&op->u.renew);
break;
case OP_RESTOREFH:
op->status = nfsd4_restorefh(current_fh, save_fh);
break;
case OP_SAVEFH:
op->status = nfsd4_savefh(current_fh, save_fh);
break;
case OP_SETATTR:
op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
break;
case OP_SETCLIENTID:
op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
break;
case OP_SETCLIENTID_CONFIRM:
op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
break;
case OP_VERIFY:
op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
if (op->status == nfserr_same)
op->status = nfs_ok;
break;
case OP_WRITE:
op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
break;
case OP_RELEASE_LOCKOWNER:
op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
break;
default:
BUG_ON(op->status == nfs_ok);
break;
}
encode_op:
if (op->status == nfserr_replay_me) {
op->replay = &replay_owner->so_replay;
nfsd4_encode_replay(resp, op);
status = op->status = op->replay->rp_status;
} else {
nfsd4_encode_operation(resp, op);
status = op->status;
}
if (replay_owner && (replay_owner != (void *)(-1))) {
nfs4_put_stateowner(replay_owner);
replay_owner = NULL;
}
/* XXX Ugh, we need to get rid of this kind of special case: */
if (op->opnum == OP_READ && op->u.read.rd_filp)
fput(op->u.read.rd_filp);
nfsd4_increment_op_stats(op->opnum);
}
out:
nfsd4_release_compoundargs(args);
if (current_fh)
fh_put(current_fh);
kfree(current_fh);
if (save_fh)
fh_put(save_fh);
kfree(save_fh);
return status;
}
#define nfs4svc_decode_voidargs NULL
#define nfs4svc_release_void NULL
#define nfsd4_voidres nfsd4_voidargs
#define nfs4svc_release_compound NULL
struct nfsd4_voidargs { int dummy; };
#define PROC(name, argt, rest, relt, cache, respsize) \
{ (svc_procfunc) nfsd4_proc_##name, \
(kxdrproc_t) nfs4svc_decode_##argt##args, \
(kxdrproc_t) nfs4svc_encode_##rest##res, \
(kxdrproc_t) nfs4svc_release_##relt, \
sizeof(struct nfsd4_##argt##args), \
sizeof(struct nfsd4_##rest##res), \
0, \
cache, \
respsize, \
}
/*
* TODO: At the present time, the NFSv4 server does not do XID caching
* of requests. Implementing XID caching would not be a serious problem,
* although it would require a mild change in interfaces since one
* doesn't know whether an NFSv4 request is idempotent until after the
* XDR decode. However, XID caching totally confuses pynfs (Peter
* Astrand's regression testsuite for NFSv4 servers), which reuses
* XID's liberally, so I've left it unimplemented until pynfs generates
* better XID's.
*/
static struct svc_procedure nfsd_procedures4[2] = {
PROC(null, void, void, void, RC_NOCACHE, 1),
PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE/4)
};
struct svc_version nfsd_version4 = {
.vs_vers = 4,
.vs_nproc = 2,
.vs_proc = nfsd_procedures4,
.vs_dispatch = nfsd_dispatch,
.vs_xdrsize = NFS4_SVC_XDRSIZE,
};
/*
* Local variables:
* c-basic-offset: 8
* End:
*/