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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 <[email protected]>
* Andy Adamson <[email protected]>
*
* 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.
*/
#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>
#include <linux/sunrpc/gss_api.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 |= NFSD_MAY_READ;
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
accmode |= NFSD_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) {
/* FIXME: check session persistence and pnfs flags.
* The nfsv4.1 spec requires the following semantics:
*
* Persistent | pNFS | Server REQUIRED | Client Allowed
* Reply Cache | server | |
* -------------+--------+-----------------+--------------------
* no | no | EXCLUSIVE4_1 | EXCLUSIVE4_1
* | | | (SHOULD)
* | | and EXCLUSIVE4 | or EXCLUSIVE4
* | | | (SHOULD NOT)
* no | yes | EXCLUSIVE4_1 | EXCLUSIVE4_1
* yes | no | GUARDED4 | GUARDED4
* yes | yes | GUARDED4 | GUARDED4
*/
/*
* 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);
/*
* Following rfc 3530 14.2.16, use the returned bitmask
* to indicate which attributes we used to store the
* verifier:
*/
if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
FATTR4_WORD1_TIME_MODIFY);
} 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);
fh_dup2(current_fh, &resfh);
/* set reply cache */
fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
&resfh.fh_handle);
if (!created)
status = do_open_permission(rqstp, current_fh, open,
NFSD_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 */
fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
¤t_fh->fh_handle);
open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
(open->op_iattr.ia_size == 0);
status = do_open_permission(rqstp, current_fh, open,
NFSD_MAY_OWNER_OVERRIDE);
return status;
}
static void
copy_clientid(clientid_t *clid, struct nfsd4_session *session)
{
struct nfsd4_sessionid *sid =
(struct nfsd4_sessionid *)session->se_sessionid.data;
clid->cl_boot = sid->clientid.cl_boot;
clid->cl_id = sid->clientid.cl_id;
}
static __be32
nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_open *open)
{
__be32 status;
struct nfsd4_compoundres *resp;
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;
if (nfsd4_has_session(cstate))
copy_clientid(&open->op_clientid, cstate->session);
nfs4_lock_state();
/* check seqid for replay. set nfs4_owner */
resp = rqstp->rq_resp;
status = nfsd4_process_open1(&resp->cstate, open);
if (status == nfserr_replay_me) {
struct nfs4_replay *rp = &open->op_stateowner->so_replay;
fh_put(&cstate->current_fh);
fh_copy_shallow(&cstate->current_fh.fh_handle,
&rp->rp_openfh);
status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_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 (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
goto out;
status = nfserr_no_grace;
if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
goto out;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
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, &cstate->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, &cstate->current_fh,
open);
if (status)
goto out;
break;
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
open->op_stateowner->so_confirmed = 1;
dprintk("NFSD: unsupported OPEN claim type %d\n",
open->op_claim_type);
status = nfserr_notsupp;
goto out;
default:
dprintk("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, &cstate->current_fh, open);
out:
if (open->op_stateowner) {
nfs4_get_stateowner(open->op_stateowner);
cstate->replay_owner = open->op_stateowner;
}
nfs4_unlock_state();
return status;
}
/*
* filehandle-manipulating ops.
*/
static __be32
nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct svc_fh **getfh)
{
if (!cstate->current_fh.fh_dentry)
return nfserr_nofilehandle;
*getfh = &cstate->current_fh;
return nfs_ok;
}
static __be32
nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_putfh *putfh)
{
fh_put(&cstate->current_fh);
cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
putfh->pf_fhlen);
return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
}
static __be32
nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
void *arg)
{
__be32 status;
fh_put(&cstate->current_fh);
status = exp_pseudoroot(rqstp, &cstate->current_fh);
return status;
}
static __be32
nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
void *arg)
{
if (!cstate->save_fh.fh_dentry)
return nfserr_restorefh;
fh_dup2(&cstate->current_fh, &cstate->save_fh);
return nfs_ok;
}
static __be32
nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
void *arg)
{
if (!cstate->current_fh.fh_dentry)
return nfserr_nofilehandle;
fh_dup2(&cstate->save_fh, &cstate->current_fh);
return nfs_ok;
}
/*
* misc nfsv4 ops
*/
static __be32
nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
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, &cstate->current_fh, &access->ac_resp_access,
&access->ac_supported);
}
static __be32
nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
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, &cstate->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 nfsd4_compound_state *cstate,
struct nfsd4_create *create)
{
struct svc_fh resfh;
__be32 status;
dev_t rdev;
fh_init(&resfh, NFS4_FHSIZE);
status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
NFSD_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, &cstate->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, &cstate->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, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&create->cr_iattr,S_IFCHR, rdev, &resfh);
break;
case NF4SOCK:
status = nfsd_create(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&create->cr_iattr, S_IFSOCK, 0, &resfh);
break;
case NF4FIFO:
status = nfsd_create(rqstp, &cstate->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, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&create->cr_iattr, S_IFDIR, 0, &resfh);
break;
default:
status = nfserr_badtype;
}
if (!status) {
fh_unlock(&cstate->current_fh);
set_change_info(&create->cr_cinfo, &cstate->current_fh);
fh_dup2(&cstate->current_fh, &resfh);
}
fh_put(&resfh);
return status;
}
static __be32
nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_getattr *getattr)
{
__be32 status;
status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
if (status)
return status;
if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
return nfserr_inval;
getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
getattr->ga_fhp = &cstate->current_fh;
return nfs_ok;
}
static __be32
nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_link *link)
{
__be32 status = nfserr_nofilehandle;
if (!cstate->save_fh.fh_dentry)
return status;
status = nfsd_link(rqstp, &cstate->current_fh,
link->li_name, link->li_namelen, &cstate->save_fh);
if (!status)
set_change_info(&link->li_cinfo, &cstate->current_fh);
return status;
}
static __be32
nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
void *arg)
{
struct svc_fh tmp_fh;
__be32 ret;
fh_init(&tmp_fh, NFS4_FHSIZE);
ret = exp_pseudoroot(rqstp, &tmp_fh);
if (ret)
return ret;
if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
fh_put(&tmp_fh);
return nfserr_noent;
}
fh_put(&tmp_fh);
return nfsd_lookup(rqstp, &cstate->current_fh,
"..", 2, &cstate->current_fh);
}
static __be32
nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_lookup *lookup)
{
return nfsd_lookup(rqstp, &cstate->current_fh,
lookup->lo_name, lookup->lo_len,
&cstate->current_fh);
}
static __be32
nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
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(cstate, &read->rd_stateid,
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 = &cstate->current_fh;
return status;
}
static __be32
nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
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_suppattrs0(cstate->minorversion);
readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
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 = &cstate->current_fh;
return nfs_ok;
}
static __be32
nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_readlink *readlink)
{
readlink->rl_rqstp = rqstp;
readlink->rl_fhp = &cstate->current_fh;
return nfs_ok;
}
static __be32
nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_remove *remove)
{
__be32 status;
if (locks_in_grace())
return nfserr_grace;
status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
remove->rm_name, remove->rm_namelen);
if (status == nfserr_symlink)
return nfserr_notdir;
if (!status) {
fh_unlock(&cstate->current_fh);
set_change_info(&remove->rm_cinfo, &cstate->current_fh);
}
return status;
}
static __be32
nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_rename *rename)
{
__be32 status = nfserr_nofilehandle;
if (!cstate->save_fh.fh_dentry)
return status;
if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
& NFSEXP_NOSUBTREECHECK))
return nfserr_grace;
status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
rename->rn_snamelen, &cstate->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(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
S_ISDIR(cstate->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, &cstate->current_fh);
set_change_info(&rename->rn_tinfo, &cstate->save_fh);
}
return status;
}
static __be32
nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_secinfo *secinfo)
{
struct svc_fh resfh;
struct svc_export *exp;
struct dentry *dentry;
__be32 err;
fh_init(&resfh, NFS4_FHSIZE);
err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
secinfo->si_name, secinfo->si_namelen,
&exp, &dentry);
if (err)
return err;
if (dentry->d_inode == NULL) {
exp_put(exp);
err = nfserr_noent;
} else
secinfo->si_exp = exp;
dput(dentry);
return err;
}
static __be32
nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_setattr *setattr)
{
__be32 status = nfs_ok;
if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
nfs4_lock_state();
status = nfs4_preprocess_stateid_op(cstate,
&setattr->sa_stateid, WR_STATE, NULL);
nfs4_unlock_state();
if (status) {
dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
return status;
}
}
status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
if (status)
return status;
status = nfs_ok;
if (setattr->sa_acl != NULL)
status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
setattr->sa_acl);
if (status)
goto out;
status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
0, (time_t)0);
out:
mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
return status;
}
static __be32
nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_write *write)
{
stateid_t *stateid = &write->wr_stateid;
struct file *filp = NULL;
u32 *p;
__be32 status = nfs_ok;
unsigned long cnt;
/* 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(cstate, stateid, WR_STATE, &filp);
if (filp)
get_file(filp);
nfs4_unlock_state();
if (status) {
dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
return status;
}
cnt = 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, &cstate->current_fh, filp,
write->wr_offset, rqstp->rq_vec, write->wr_vlen,
&cnt, &write->wr_how_written);
if (filp)
fput(filp);
write->wr_bytes_written = cnt;
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 nfsd4_compound_state *cstate,
struct nfsd4_verify *verify)
{
__be32 *buf, *p;
int count;
__be32 status;
status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
if (status)
return status;
if ((verify->ve_bmval[0] & ~nfsd_suppattrs0(cstate->minorversion))
|| (verify->ve_bmval[1] & ~nfsd_suppattrs1(cstate->minorversion))
|| (verify->ve_bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
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(&cstate->current_fh,
cstate->current_fh.fh_export,
cstate->current_fh.fh_dentry, buf,
&count, verify->ve_bmval,
rqstp, 0);
/* 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;
/* skip bitmap */
p = buf + 1 + ntohl(buf[0]);
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;
}
static __be32
nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_verify *verify)
{
__be32 status;
status = _nfsd4_verify(rqstp, cstate, verify);
return status == nfserr_not_same ? nfs_ok : status;
}
static __be32
nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_verify *verify)
{
__be32 status;
status = _nfsd4_verify(rqstp, cstate, verify);
return status == nfserr_same ? nfs_ok : 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]++;
}
typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
void *);
enum nfsd4_op_flags {
ALLOWED_WITHOUT_FH = 1 << 0, /* No current filehandle required */
ALLOWED_ON_ABSENT_FS = 2 << 0, /* ops processed on absent fs */
ALLOWED_AS_FIRST_OP = 3 << 0, /* ops reqired first in compound */
};
struct nfsd4_operation {
nfsd4op_func op_func;
u32 op_flags;
char *op_name;
};
static struct nfsd4_operation nfsd4_ops[];
static const char *nfsd4_op_name(unsigned opnum);
/*
* This is a replay of a compound for which no cache entry pages
* were used. Encode the sequence operation, and if cachethis is FALSE
* encode the uncache rep error on the next operation.
*/
static __be32
nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
struct nfsd4_compoundres *resp)
{
struct nfsd4_op *op;
dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
/* Encode the replayed sequence operation */
BUG_ON(resp->opcnt != 1);
op = &args->ops[resp->opcnt - 1];
nfsd4_encode_operation(resp, op);
/*return nfserr_retry_uncached_rep in next operation. */
if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
op = &args->ops[resp->opcnt++];
op->status = nfserr_retry_uncached_rep;
nfsd4_encode_operation(resp, op);
}
return op->status;
}
/*
* Enforce NFSv4.1 COMPOUND ordering rules.
*
* TODO:
* - enforce NFS4ERR_NOT_ONLY_OP,
* - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
*/
static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
{
if (args->minorversion && args->opcnt > 0) {
struct nfsd4_op *op = &args->ops[0];
return (op->status == nfserr_op_illegal) ||
(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
}
return true;
}
/*
* COMPOUND call.
*/
static __be32
nfsd4_proc_compound(struct svc_rqst *rqstp,
struct nfsd4_compoundargs *args,
struct nfsd4_compoundres *resp)
{
struct nfsd4_op *op;
struct nfsd4_operation *opdesc;
struct nfsd4_compound_state *cstate = &resp->cstate;
int slack_bytes;
__be32 status;
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;
resp->cstate.minorversion = args->minorversion;
resp->cstate.replay_owner = NULL;
fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
/* Use the deferral mechanism only for NFSv4.0 compounds */
rqstp->rq_usedeferral = (args->minorversion == 0);
/*
* According to RFC3010, this takes precedence over all other errors.
*/
status = nfserr_minor_vers_mismatch;
if (args->minorversion > nfsd_supported_minorversion)
goto out;
if (!nfs41_op_ordering_ok(args)) {
op = &args->ops[0];
op->status = nfserr_sequence_pos;
goto encode_op;
}
status = nfs_ok;
while (!status && resp->opcnt < args->opcnt) {
op = &args->ops[resp->opcnt++];
dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
resp->opcnt, args->opcnt, op->opnum,
nfsd4_op_name(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.
*/
slack_bytes = (char *)resp->end - (char *)resp->p;
if (slack_bytes < COMPOUND_SLACK_SPACE
+ COMPOUND_ERR_SLACK_SPACE) {
BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
op->status = nfserr_resource;
goto encode_op;
}
opdesc = &nfsd4_ops[op->opnum];
if (!cstate->current_fh.fh_dentry) {
if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
op->status = nfserr_nofilehandle;
goto encode_op;
}
} else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
!(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
op->status = nfserr_moved;
goto encode_op;
}
if (opdesc->op_func)
op->status = opdesc->op_func(rqstp, cstate, &op->u);
else
BUG_ON(op->status == nfs_ok);
encode_op:
/* Only from SEQUENCE or CREATE_SESSION */
if (resp->cstate.status == nfserr_replay_cache) {