forked from Minki/linux
dcc46991d3
nfsd_dispatch() is a hot path. Let's optimize the XDR method calls for the by-far common case, which is that the XDR methods are indeed present. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
423 lines
10 KiB
C
423 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Process version 2 NFSACL requests.
|
|
*
|
|
* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
|
|
*/
|
|
|
|
#include "nfsd.h"
|
|
/* FIXME: nfsacl.h is a broken header */
|
|
#include <linux/nfsacl.h>
|
|
#include <linux/gfp.h>
|
|
#include "cache.h"
|
|
#include "xdr3.h"
|
|
#include "vfs.h"
|
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_PROC
|
|
#define RETURN_STATUS(st) { resp->status = (st); return (st); }
|
|
|
|
/*
|
|
* NULL call.
|
|
*/
|
|
static __be32
|
|
nfsacld_proc_null(struct svc_rqst *rqstp)
|
|
{
|
|
return nfs_ok;
|
|
}
|
|
|
|
/*
|
|
* Get the Access and/or Default ACL of a file.
|
|
*/
|
|
static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_getaclargs *argp = rqstp->rq_argp;
|
|
struct nfsd3_getaclres *resp = rqstp->rq_resp;
|
|
struct posix_acl *acl;
|
|
struct inode *inode;
|
|
svc_fh *fh;
|
|
__be32 nfserr = 0;
|
|
|
|
dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
|
|
|
|
fh = fh_copy(&resp->fh, &argp->fh);
|
|
nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
|
|
if (nfserr)
|
|
RETURN_STATUS(nfserr);
|
|
|
|
inode = d_inode(fh->fh_dentry);
|
|
|
|
if (argp->mask & ~NFS_ACL_MASK)
|
|
RETURN_STATUS(nfserr_inval);
|
|
resp->mask = argp->mask;
|
|
|
|
nfserr = fh_getattr(fh, &resp->stat);
|
|
if (nfserr)
|
|
RETURN_STATUS(nfserr);
|
|
|
|
if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
|
|
acl = get_acl(inode, ACL_TYPE_ACCESS);
|
|
if (acl == NULL) {
|
|
/* Solaris returns the inode's minimum ACL. */
|
|
acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
|
|
}
|
|
if (IS_ERR(acl)) {
|
|
nfserr = nfserrno(PTR_ERR(acl));
|
|
goto fail;
|
|
}
|
|
resp->acl_access = acl;
|
|
}
|
|
if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
|
|
/* Check how Solaris handles requests for the Default ACL
|
|
of a non-directory! */
|
|
acl = get_acl(inode, ACL_TYPE_DEFAULT);
|
|
if (IS_ERR(acl)) {
|
|
nfserr = nfserrno(PTR_ERR(acl));
|
|
goto fail;
|
|
}
|
|
resp->acl_default = acl;
|
|
}
|
|
|
|
/* resp->acl_{access,default} are released in nfssvc_release_getacl. */
|
|
RETURN_STATUS(0);
|
|
|
|
fail:
|
|
posix_acl_release(resp->acl_access);
|
|
posix_acl_release(resp->acl_default);
|
|
RETURN_STATUS(nfserr);
|
|
}
|
|
|
|
/*
|
|
* Set the Access and/or Default ACL of a file.
|
|
*/
|
|
static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_setaclargs *argp = rqstp->rq_argp;
|
|
struct nfsd_attrstat *resp = rqstp->rq_resp;
|
|
struct inode *inode;
|
|
svc_fh *fh;
|
|
__be32 nfserr = 0;
|
|
int error;
|
|
|
|
dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
|
|
|
|
fh = fh_copy(&resp->fh, &argp->fh);
|
|
nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
|
|
if (nfserr)
|
|
goto out;
|
|
|
|
inode = d_inode(fh->fh_dentry);
|
|
|
|
error = fh_want_write(fh);
|
|
if (error)
|
|
goto out_errno;
|
|
|
|
fh_lock(fh);
|
|
|
|
error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
|
|
if (error)
|
|
goto out_drop_lock;
|
|
error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
|
|
if (error)
|
|
goto out_drop_lock;
|
|
|
|
fh_unlock(fh);
|
|
|
|
fh_drop_write(fh);
|
|
|
|
nfserr = fh_getattr(fh, &resp->stat);
|
|
|
|
out:
|
|
/* argp->acl_{access,default} may have been allocated in
|
|
nfssvc_decode_setaclargs. */
|
|
posix_acl_release(argp->acl_access);
|
|
posix_acl_release(argp->acl_default);
|
|
return nfserr;
|
|
out_drop_lock:
|
|
fh_unlock(fh);
|
|
fh_drop_write(fh);
|
|
out_errno:
|
|
nfserr = nfserrno(error);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Check file attributes
|
|
*/
|
|
static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd_fhandle *argp = rqstp->rq_argp;
|
|
struct nfsd_attrstat *resp = rqstp->rq_resp;
|
|
__be32 nfserr;
|
|
dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
|
|
|
|
fh_copy(&resp->fh, &argp->fh);
|
|
nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
|
|
if (nfserr)
|
|
return nfserr;
|
|
nfserr = fh_getattr(&resp->fh, &resp->stat);
|
|
return nfserr;
|
|
}
|
|
|
|
/*
|
|
* Check file access
|
|
*/
|
|
static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_accessargs *argp = rqstp->rq_argp;
|
|
struct nfsd3_accessres *resp = rqstp->rq_resp;
|
|
__be32 nfserr;
|
|
|
|
dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
|
|
SVCFH_fmt(&argp->fh),
|
|
argp->access);
|
|
|
|
fh_copy(&resp->fh, &argp->fh);
|
|
resp->access = argp->access;
|
|
nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
|
|
if (nfserr)
|
|
return nfserr;
|
|
nfserr = fh_getattr(&resp->fh, &resp->stat);
|
|
return nfserr;
|
|
}
|
|
|
|
/*
|
|
* XDR decode functions
|
|
*/
|
|
static int nfsaclsvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_getaclargs *argp = rqstp->rq_argp;
|
|
|
|
p = nfs2svc_decode_fh(p, &argp->fh);
|
|
if (!p)
|
|
return 0;
|
|
argp->mask = ntohl(*p); p++;
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
|
|
static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_setaclargs *argp = rqstp->rq_argp;
|
|
struct kvec *head = rqstp->rq_arg.head;
|
|
unsigned int base;
|
|
int n;
|
|
|
|
p = nfs2svc_decode_fh(p, &argp->fh);
|
|
if (!p)
|
|
return 0;
|
|
argp->mask = ntohl(*p++);
|
|
if (argp->mask & ~NFS_ACL_MASK ||
|
|
!xdr_argsize_check(rqstp, p))
|
|
return 0;
|
|
|
|
base = (char *)p - (char *)head->iov_base;
|
|
n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
|
|
(argp->mask & NFS_ACL) ?
|
|
&argp->acl_access : NULL);
|
|
if (n > 0)
|
|
n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
|
|
(argp->mask & NFS_DFACL) ?
|
|
&argp->acl_default : NULL);
|
|
return (n > 0);
|
|
}
|
|
|
|
static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd_fhandle *argp = rqstp->rq_argp;
|
|
|
|
p = nfs2svc_decode_fh(p, &argp->fh);
|
|
if (!p)
|
|
return 0;
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_accessargs *argp = rqstp->rq_argp;
|
|
|
|
p = nfs2svc_decode_fh(p, &argp->fh);
|
|
if (!p)
|
|
return 0;
|
|
argp->access = ntohl(*p++);
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
/*
|
|
* XDR encode functions
|
|
*/
|
|
|
|
/*
|
|
* There must be an encoding function for void results so svc_process
|
|
* will work properly.
|
|
*/
|
|
static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/* GETACL */
|
|
static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_getaclres *resp = rqstp->rq_resp;
|
|
struct dentry *dentry = resp->fh.fh_dentry;
|
|
struct inode *inode;
|
|
struct kvec *head = rqstp->rq_res.head;
|
|
unsigned int base;
|
|
int n;
|
|
int w;
|
|
|
|
/*
|
|
* Since this is version 2, the check for nfserr in
|
|
* nfsd_dispatch actually ensures the following cannot happen.
|
|
* However, it seems fragile to depend on that.
|
|
*/
|
|
if (dentry == NULL || d_really_is_negative(dentry))
|
|
return 0;
|
|
inode = d_inode(dentry);
|
|
|
|
p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
|
|
*p++ = htonl(resp->mask);
|
|
if (!xdr_ressize_check(rqstp, p))
|
|
return 0;
|
|
base = (char *)p - (char *)head->iov_base;
|
|
|
|
rqstp->rq_res.page_len = w = nfsacl_size(
|
|
(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
|
|
(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
|
|
while (w > 0) {
|
|
if (!*(rqstp->rq_next_page++))
|
|
return 0;
|
|
w -= PAGE_SIZE;
|
|
}
|
|
|
|
n = nfsacl_encode(&rqstp->rq_res, base, inode,
|
|
resp->acl_access,
|
|
resp->mask & NFS_ACL, 0);
|
|
if (n > 0)
|
|
n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
|
|
resp->acl_default,
|
|
resp->mask & NFS_DFACL,
|
|
NFS_ACL_DEFAULT);
|
|
return (n > 0);
|
|
}
|
|
|
|
static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd_attrstat *resp = rqstp->rq_resp;
|
|
|
|
p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/* ACCESS */
|
|
static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd3_accessres *resp = rqstp->rq_resp;
|
|
|
|
p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
|
|
*p++ = htonl(resp->access);
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/*
|
|
* XDR release functions
|
|
*/
|
|
static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_getaclres *resp = rqstp->rq_resp;
|
|
|
|
fh_put(&resp->fh);
|
|
posix_acl_release(resp->acl_access);
|
|
posix_acl_release(resp->acl_default);
|
|
}
|
|
|
|
static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd_attrstat *resp = rqstp->rq_resp;
|
|
|
|
fh_put(&resp->fh);
|
|
}
|
|
|
|
static void nfsaclsvc_release_access(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd3_accessres *resp = rqstp->rq_resp;
|
|
|
|
fh_put(&resp->fh);
|
|
}
|
|
|
|
struct nfsd3_voidargs { int dummy; };
|
|
|
|
#define ST 1 /* status*/
|
|
#define AT 21 /* attributes */
|
|
#define pAT (1+AT) /* post attributes - conditional */
|
|
#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
|
|
|
|
static const struct svc_procedure nfsd_acl_procedures2[5] = {
|
|
[ACLPROC2_NULL] = {
|
|
.pc_func = nfsacld_proc_null,
|
|
.pc_decode = nfsaclsvc_decode_voidarg,
|
|
.pc_encode = nfsaclsvc_encode_voidres,
|
|
.pc_argsize = sizeof(struct nfsd3_voidargs),
|
|
.pc_ressize = sizeof(struct nfsd3_voidargs),
|
|
.pc_cachetype = RC_NOCACHE,
|
|
.pc_xdrressize = ST,
|
|
},
|
|
[ACLPROC2_GETACL] = {
|
|
.pc_func = nfsacld_proc_getacl,
|
|
.pc_decode = nfsaclsvc_decode_getaclargs,
|
|
.pc_encode = nfsaclsvc_encode_getaclres,
|
|
.pc_release = nfsaclsvc_release_getacl,
|
|
.pc_argsize = sizeof(struct nfsd3_getaclargs),
|
|
.pc_ressize = sizeof(struct nfsd3_getaclres),
|
|
.pc_cachetype = RC_NOCACHE,
|
|
.pc_xdrressize = ST+1+2*(1+ACL),
|
|
},
|
|
[ACLPROC2_SETACL] = {
|
|
.pc_func = nfsacld_proc_setacl,
|
|
.pc_decode = nfsaclsvc_decode_setaclargs,
|
|
.pc_encode = nfsaclsvc_encode_attrstatres,
|
|
.pc_release = nfsaclsvc_release_attrstat,
|
|
.pc_argsize = sizeof(struct nfsd3_setaclargs),
|
|
.pc_ressize = sizeof(struct nfsd_attrstat),
|
|
.pc_cachetype = RC_NOCACHE,
|
|
.pc_xdrressize = ST+AT,
|
|
},
|
|
[ACLPROC2_GETATTR] = {
|
|
.pc_func = nfsacld_proc_getattr,
|
|
.pc_decode = nfsaclsvc_decode_fhandleargs,
|
|
.pc_encode = nfsaclsvc_encode_attrstatres,
|
|
.pc_release = nfsaclsvc_release_attrstat,
|
|
.pc_argsize = sizeof(struct nfsd_fhandle),
|
|
.pc_ressize = sizeof(struct nfsd_attrstat),
|
|
.pc_cachetype = RC_NOCACHE,
|
|
.pc_xdrressize = ST+AT,
|
|
},
|
|
[ACLPROC2_ACCESS] = {
|
|
.pc_func = nfsacld_proc_access,
|
|
.pc_decode = nfsaclsvc_decode_accessargs,
|
|
.pc_encode = nfsaclsvc_encode_accessres,
|
|
.pc_release = nfsaclsvc_release_access,
|
|
.pc_argsize = sizeof(struct nfsd3_accessargs),
|
|
.pc_ressize = sizeof(struct nfsd3_accessres),
|
|
.pc_cachetype = RC_NOCACHE,
|
|
.pc_xdrressize = ST+AT+1,
|
|
},
|
|
};
|
|
|
|
static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)];
|
|
const struct svc_version nfsd_acl_version2 = {
|
|
.vs_vers = 2,
|
|
.vs_nproc = 5,
|
|
.vs_proc = nfsd_acl_procedures2,
|
|
.vs_count = nfsd_acl_count2,
|
|
.vs_dispatch = nfsd_dispatch,
|
|
.vs_xdrsize = NFS3_SVC_XDRSIZE,
|
|
};
|