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nfs4proc.c
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nfs4proc.c
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/*
* 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.
*/
#include <linux/fs_struct.h>
#include <linux/file.h>
#include <linux/falloc.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/namei.h>
#include <linux/sunrpc/addr.h>
#include <linux/nfs_ssc.h>
#include "idmap.h"
#include "cache.h"
#include "xdr4.h"
#include "vfs.h"
#include "current_stateid.h"
#include "netns.h"
#include "acl.h"
#include "pnfs.h"
#include "trace.h"
static bool inter_copy_offload_enable;
module_param(inter_copy_offload_enable, bool, 0644);
MODULE_PARM_DESC(inter_copy_offload_enable,
"Enable inter server to server copy offload. Default: false");
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
static int nfsd4_ssc_umount_timeout = 900000; /* default to 15 mins */
module_param(nfsd4_ssc_umount_timeout, int, 0644);
MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
"idle msecs before unmount export from source server");
#endif
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#include <linux/security.h>
static inline void
nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
{
struct inode *inode = d_inode(resfh->fh_dentry);
int status;
inode_lock(inode);
status = security_inode_setsecctx(resfh->fh_dentry,
label->data, label->len);
inode_unlock(inode);
if (status)
/*
* XXX: We should really fail the whole open, but we may
* already have created a new file, so it may be too
* late. For now this seems the least of evils:
*/
bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
return;
}
#else
static inline void
nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
{ }
#endif
#define NFSDDBG_FACILITY NFSDDBG_PROC
static u32 nfsd_attrmask[] = {
NFSD_WRITEABLE_ATTRS_WORD0,
NFSD_WRITEABLE_ATTRS_WORD1,
NFSD_WRITEABLE_ATTRS_WORD2
};
static u32 nfsd41_ex_attrmask[] = {
NFSD_SUPPATTR_EXCLCREAT_WORD0,
NFSD_SUPPATTR_EXCLCREAT_WORD1,
NFSD_SUPPATTR_EXCLCREAT_WORD2
};
static __be32
check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
u32 *bmval, u32 *writable)
{
struct dentry *dentry = cstate->current_fh.fh_dentry;
struct svc_export *exp = cstate->current_fh.fh_export;
if (!nfsd_attrs_supported(cstate->minorversion, bmval))
return nfserr_attrnotsupp;
if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
return nfserr_attrnotsupp;
if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
!(exp->ex_flags & NFSEXP_SECURITY_LABEL))
return nfserr_attrnotsupp;
if (writable && !bmval_is_subset(bmval, writable))
return nfserr_inval;
if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
(bmval[1] & FATTR4_WORD1_MODE))
return nfserr_inval;
return nfs_ok;
}
static __be32
nfsd4_check_open_attributes(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
{
__be32 status = nfs_ok;
if (open->op_create == NFS4_OPEN_CREATE) {
if (open->op_createmode == NFS4_CREATE_UNCHECKED
|| open->op_createmode == NFS4_CREATE_GUARDED)
status = check_attr_support(rqstp, cstate,
open->op_bmval, nfsd_attrmask);
else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
status = check_attr_support(rqstp, cstate,
open->op_bmval, nfsd41_ex_attrmask);
}
return status;
}
static int
is_create_with_attrs(struct nfsd4_open *open)
{
return open->op_create == NFS4_OPEN_CREATE
&& (open->op_createmode == NFS4_CREATE_UNCHECKED
|| open->op_createmode == NFS4_CREATE_GUARDED
|| open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
}
/*
* if error occurs when setting the acl, just clear the acl bit
* in the returned attr bitmap.
*/
static void
do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct nfs4_acl *acl, u32 *bmval)
{
__be32 status;
status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
if (status)
/*
* We should probably fail the whole open at this point,
* but we've already created the file, so it's too late;
* So this seems the least of evils:
*/
bmval[0] &= ~FATTR4_WORD0_ACL;
}
static inline void
fh_dup2(struct svc_fh *dst, struct svc_fh *src)
{
fh_put(dst);
dget(src->fh_dentry);
if (src->fh_export)
exp_get(src->fh_export);
*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;
accmode |= NFSD_MAY_READ_IF_EXEC;
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_READ)
accmode |= NFSD_MAY_WRITE;
status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
return status;
}
static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
{
umode_t mode = d_inode(fh->fh_dentry)->i_mode;
if (S_ISREG(mode))
return nfs_ok;
if (S_ISDIR(mode))
return nfserr_isdir;
/*
* Using err_symlink as our catch-all case may look odd; but
* there's no other obvious error for this case in 4.0, and we
* happen to know that it will cause the linux v4 client to do
* the right thing on attempts to open something other than a
* regular file.
*/
return nfserr_symlink;
}
static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
{
if (nfsd4_has_session(cstate))
return;
fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
&resfh->fh_handle);
}
static inline bool nfsd4_create_is_exclusive(int createmode)
{
return createmode == NFS4_CREATE_EXCLUSIVE ||
createmode == NFS4_CREATE_EXCLUSIVE4_1;
}
static __be32
nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
struct nfsd4_open *open)
{
struct file *filp;
struct path path;
int oflags;
oflags = O_CREAT | O_LARGEFILE;
switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
case NFS4_SHARE_ACCESS_WRITE:
oflags |= O_WRONLY;
break;
case NFS4_SHARE_ACCESS_BOTH:
oflags |= O_RDWR;
break;
default:
oflags |= O_RDONLY;
}
path.mnt = fhp->fh_export->ex_path.mnt;
path.dentry = child;
filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
current_cred());
if (IS_ERR(filp))
return nfserrno(PTR_ERR(filp));
open->op_filp = filp;
return nfs_ok;
}
/*
* Implement NFSv4's unchecked, guarded, and exclusive create
* semantics for regular files. Open state for this new file is
* subsequently fabricated in nfsd4_process_open2().
*
* Upon return, caller must release @fhp and @resfhp.
*/
static __be32
nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct svc_fh *resfhp, struct nfsd4_open *open)
{
struct iattr *iap = &open->op_iattr;
struct nfsd_attrs attrs = {
.na_iattr = iap,
};
struct dentry *parent, *child;
__u32 v_mtime, v_atime;
struct inode *inode;
__be32 status;
int host_err;
if (isdotent(open->op_fname, open->op_fnamelen))
return nfserr_exist;
if (!(iap->ia_valid & ATTR_MODE))
iap->ia_mode = 0;
status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
if (status != nfs_ok)
return status;
parent = fhp->fh_dentry;
inode = d_inode(parent);
host_err = fh_want_write(fhp);
if (host_err)
return nfserrno(host_err);
fh_lock_nested(fhp, I_MUTEX_PARENT);
child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
if (IS_ERR(child)) {
status = nfserrno(PTR_ERR(child));
goto out;
}
if (d_really_is_negative(child)) {
status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
if (status != nfs_ok)
goto out;
}
status = fh_compose(resfhp, fhp->fh_export, child, fhp);
if (status != nfs_ok)
goto out;
v_mtime = 0;
v_atime = 0;
if (nfsd4_create_is_exclusive(open->op_createmode)) {
u32 *verifier = (u32 *)open->op_verf.data;
/*
* Solaris 7 gets confused (bugid 4218508) if these have
* the high bit set, as do xfs filesystems without the
* "bigtime" feature. So just clear the high bits. If this
* is ever changed to use different attrs for storing the
* verifier, then do_open_lookup() will also need to be
* fixed accordingly.
*/
v_mtime = verifier[0] & 0x7fffffff;
v_atime = verifier[1] & 0x7fffffff;
}
if (d_really_is_positive(child)) {
status = nfs_ok;
switch (open->op_createmode) {
case NFS4_CREATE_UNCHECKED:
if (!d_is_reg(child))
break;
/*
* In NFSv4, we don't want to truncate the file
* now. This would be wrong if the OPEN fails for
* some other reason. Furthermore, if the size is
* nonzero, we should ignore it according to spec!
*/
open->op_truncate = (iap->ia_valid & ATTR_SIZE) &&
!iap->ia_size;
break;
case NFS4_CREATE_GUARDED:
status = nfserr_exist;
break;
case NFS4_CREATE_EXCLUSIVE:
if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
d_inode(child)->i_atime.tv_sec == v_atime &&
d_inode(child)->i_size == 0) {
open->op_created = true;
break; /* subtle */
}
status = nfserr_exist;
break;
case NFS4_CREATE_EXCLUSIVE4_1:
if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
d_inode(child)->i_atime.tv_sec == v_atime &&
d_inode(child)->i_size == 0) {
open->op_created = true;
goto set_attr; /* subtle */
}
status = nfserr_exist;
}
goto out;
}
if (!IS_POSIXACL(inode))
iap->ia_mode &= ~current_umask();
status = nfsd4_vfs_create(fhp, child, open);
if (status != nfs_ok)
goto out;
open->op_created = true;
/* A newly created file already has a file size of zero. */
if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
iap->ia_valid &= ~ATTR_SIZE;
if (nfsd4_create_is_exclusive(open->op_createmode)) {
iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
ATTR_MTIME_SET|ATTR_ATIME_SET;
iap->ia_mtime.tv_sec = v_mtime;
iap->ia_atime.tv_sec = v_atime;
iap->ia_mtime.tv_nsec = 0;
iap->ia_atime.tv_nsec = 0;
}
set_attr:
status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
out:
fh_unlock(fhp);
if (child && !IS_ERR(child))
dput(child);
fh_drop_write(fhp);
return status;
}
static __be32
do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
{
struct svc_fh *current_fh = &cstate->current_fh;
int accmode;
__be32 status;
*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
if (!*resfh)
return nfserr_jukebox;
fh_init(*resfh, NFS4_FHSIZE);
open->op_truncate = false;
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
*/
current->fs->umask = open->op_umask;
status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
current->fs->umask = 0;
if (!status && open->op_label.len)
nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
/*
* Following rfc 3530 14.2.16, and rfc 5661 18.16.4
* use the returned bitmask to indicate which attributes
* we used to store the verifier:
*/
if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
FATTR4_WORD1_TIME_MODIFY);
} else
/*
* Note this may exit with the parent still locked.
* We will hold the lock until nfsd4_open's final
* lookup, to prevent renames or unlinks until we've had
* a chance to an acquire a delegation if appropriate.
*/
status = nfsd_lookup(rqstp, current_fh,
open->op_fname, open->op_fnamelen, *resfh);
if (status)
goto out;
status = nfsd_check_obj_isreg(*resfh);
if (status)
goto out;
if (is_create_with_attrs(open) && open->op_acl != NULL)
do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
accmode = NFSD_MAY_NOP;
if (open->op_created ||
open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
accmode |= NFSD_MAY_OWNER_OVERRIDE;
status = do_open_permission(rqstp, *resfh, open, accmode);
set_change_info(&open->op_cinfo, current_fh);
out:
return status;
}
static __be32
do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
{
struct svc_fh *current_fh = &cstate->current_fh;
__be32 status;
int accmode = 0;
/* 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));
nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
(open->op_iattr.ia_size == 0);
/*
* In the delegation case, the client is telling us about an
* open that it *already* performed locally, some time ago. We
* should let it succeed now if possible.
*
* In the case of a CLAIM_FH open, on the other hand, the client
* may be counting on us to enforce permissions (the Linux 4.1
* client uses this for normal opens, for example).
*/
if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
accmode = NFSD_MAY_OWNER_OVERRIDE;
status = do_open_permission(rqstp, current_fh, open, accmode);
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,
union nfsd4_op_u *u)
{
struct nfsd4_open *open = &u->open;
__be32 status;
struct svc_fh *resfh = NULL;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
bool reclaim = false;
dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
(int)open->op_fnamelen, open->op_fname,
open->op_openowner);
open->op_filp = NULL;
open->op_rqstp = rqstp;
/* This check required by spec. */
if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
return nfserr_inval;
open->op_created = false;
/*
* RFC5661 18.51.3
* Before RECLAIM_COMPLETE done, server should deny new lock
*/
if (nfsd4_has_session(cstate) &&
!test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
return nfserr_grace;
if (nfsd4_has_session(cstate))
copy_clientid(&open->op_clientid, cstate->session);
/* check seqid for replay. set nfs4_owner */
status = nfsd4_process_open1(cstate, open, nn);
if (status == nfserr_replay_me) {
struct nfs4_replay *rp = &open->op_openowner->oo_owner.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;
if (open->op_xdr_error) {
status = open->op_xdr_error;
goto out;
}
status = nfsd4_check_open_attributes(rqstp, cstate, open);
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 (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
goto out;
status = nfserr_no_grace;
if (!opens_in_grace(net) && 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:
status = do_open_lookup(rqstp, cstate, open, &resfh);
if (status)
goto out;
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
status = nfs4_check_open_reclaim(cstate->clp);
if (status)
goto out;
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
reclaim = true;
fallthrough;
case NFS4_OPEN_CLAIM_FH:
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
status = do_open_fhandle(rqstp, cstate, open);
if (status)
goto out;
resfh = &cstate->current_fh;
break;
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
status = nfserr_notsupp;
goto out;
default:
status = nfserr_inval;
goto out;
}
status = nfsd4_process_open2(rqstp, resfh, open);
if (status && open->op_created)
pr_warn("nfsd4_process_open2 failed to open newly-created file: status=%u\n",
be32_to_cpu(status));
if (reclaim && !status)
nn->somebody_reclaimed = true;
out:
if (open->op_filp) {
fput(open->op_filp);
open->op_filp = NULL;
}
if (resfh && resfh != &cstate->current_fh) {
fh_dup2(&cstate->current_fh, resfh);
fh_put(resfh);
kfree(resfh);
}
nfsd4_cleanup_open_state(cstate, open);
nfsd4_bump_seqid(cstate, status);
return status;
}
/*
* OPEN is the only seqid-mutating operation whose decoding can fail
* with a seqid-mutating error (specifically, decoding of user names in
* the attributes). Therefore we have to do some processing to look up
* the stateowner so that we can bump the seqid.
*/
static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
{
struct nfsd4_open *open = &op->u.open;
if (!seqid_mutating_err(ntohl(op->status)))
return op->status;
if (nfsd4_has_session(cstate))
return op->status;
open->op_xdr_error = op->status;
return nfsd4_open(rqstp, cstate, &op->u);
}
/*
* filehandle-manipulating ops.
*/
static __be32
nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
u->getfh = &cstate->current_fh;
return nfs_ok;
}
static __be32
nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_putfh *putfh = &u->putfh;
__be32 ret;
fh_put(&cstate->current_fh);
cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
putfh->pf_fhlen);
ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
if (ret == nfserr_stale && putfh->no_verify) {
SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
ret = 0;
}
#endif
return ret;
}
static __be32
nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
__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,
union nfsd4_op_u *u)
{
if (!cstate->save_fh.fh_dentry)
return nfserr_restorefh;
fh_dup2(&cstate->current_fh, &cstate->save_fh);
if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
}
return nfs_ok;
}
static __be32
nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
fh_dup2(&cstate->save_fh, &cstate->current_fh);
if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
}
return nfs_ok;
}
/*
* misc nfsv4 ops
*/
static __be32
nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_access *access = &u->access;
u32 access_full;
access_full = NFS3_ACCESS_FULL;
if (cstate->minorversion >= 2)
access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
NFS4_ACCESS_XAWRITE;
if (access->ac_req_access & ~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 void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
{
__be32 *verf = (__be32 *)verifier->data;
BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
nfsd_copy_write_verifier(verf, net_generic(net, nfsd_net_id));
}
static __be32
nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_commit *commit = &u->commit;
return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
commit->co_count,
(__be32 *)commit->co_verf.data);
}
static __be32
nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_create *create = &u->create;
struct nfsd_attrs attrs = {
.na_iattr = &create->cr_iattr,
};
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_NOP);
if (status)
return status;
status = check_attr_support(rqstp, cstate, create->cr_bmval,
nfsd_attrmask);
if (status)
return status;
current->fs->umask = create->cr_umask;
switch (create->cr_type) {
case NF4LNK:
status = nfsd_symlink(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
create->cr_data, &resfh);
break;
case NF4BLK:
status = nfserr_inval;
rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
if (MAJOR(rdev) != create->cr_specdata1 ||
MINOR(rdev) != create->cr_specdata2)
goto out_umask;
status = nfsd_create(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&attrs, S_IFBLK, rdev, &resfh);
break;
case NF4CHR:
status = nfserr_inval;
rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
if (MAJOR(rdev) != create->cr_specdata1 ||
MINOR(rdev) != create->cr_specdata2)
goto out_umask;
status = nfsd_create(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&attrs, S_IFCHR, rdev, &resfh);
break;
case NF4SOCK:
status = nfsd_create(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&attrs, S_IFSOCK, 0, &resfh);
break;
case NF4FIFO:
status = nfsd_create(rqstp, &cstate->current_fh,
create->cr_name, create->cr_namelen,
&attrs, 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,
&attrs, S_IFDIR, 0, &resfh);
break;
default:
status = nfserr_badtype;
}
if (status)
goto out;
if (create->cr_label.len)
nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
if (create->cr_acl != NULL)
do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
create->cr_bmval);
fh_unlock(&cstate->current_fh);
set_change_info(&create->cr_cinfo, &cstate->current_fh);
fh_dup2(&cstate->current_fh, &resfh);
out:
fh_put(&resfh);
out_umask:
current->fs->umask = 0;
return status;
}
static __be32
nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_getattr *getattr = &u->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_suppattrs[cstate->minorversion][0];
getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
getattr->ga_fhp = &cstate->current_fh;
return nfs_ok;
}
static __be32
nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_link *link = &u->link;
__be32 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_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
{
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 == fh->fh_dentry) {
fh_put(&tmp_fh);
return nfserr_noent;
}
fh_put(&tmp_fh);
return nfsd_lookup(rqstp, fh, "..", 2, fh);
}
static __be32
nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
}
static __be32
nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
return nfsd_lookup(rqstp, &cstate->current_fh,
u->lookup.lo_name, u->lookup.lo_len,
&cstate->current_fh);
}
static __be32
nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_read *read = &u->read;
__be32 status;
read->rd_nf = NULL;
trace_nfsd_read_start(rqstp, &cstate->current_fh,
read->rd_offset, read->rd_length);
read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
if (read->rd_offset > (u64)OFFSET_MAX)
read->rd_offset = (u64)OFFSET_MAX;
if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
/*
* If we do a zero copy read, then a client will see read data
* that reflects the state of the file *after* performing the
* following compound.
*
* To ensure proper ordering, we therefore turn off zero copy if
* the client wants us to do more in this compound:
*/
if (!nfsd4_last_compound_op(rqstp))
__clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
/* check stateid */
status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
&read->rd_stateid, RD_STATE,
&read->rd_nf, NULL);
if (status) {
dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
goto out;
}
status = nfs_ok;
out:
read->rd_rqstp = rqstp;
read->rd_fhp = &cstate->current_fh;
return status;
}
static void
nfsd4_read_release(union nfsd4_op_u *u)
{