linux-stable/fs/nfsd/nfs3acl.c
J. Bruce Fields ac8587dcb5 knfsd: fix spurious EINVAL errors on first access of new filesystem
The v2/v3 acl code in nfsd is translating any return from fh_verify() to
nfserr_inval.  This is particularly unfortunate in the case of an
nfserr_dropit return, which is an internal error meant to indicate to
callers that this request has been deferred and should just be dropped
pending the results of an upcall to mountd.

Thanks to Roland <devzero@web.de> for bug report and data collection.

Cc: Roland <devzero@web.de>
Acked-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Reviewed-By: NeilBrown <neilb@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-11-12 14:28:08 -08:00

268 lines
6.4 KiB
C

/*
* linux/fs/nfsd/nfs3acl.c
*
* Process version 3 NFSACL requests.
*
* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
*/
#include <linux/sunrpc/svc.h>
#include <linux/nfs3.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr3.h>
#include <linux/posix_acl.h>
#include <linux/nfsacl.h>
#define RETURN_STATUS(st) { resp->status = (st); return (st); }
/*
* NULL call.
*/
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
return nfs_ok;
}
/*
* Get the Access and/or Default ACL of a file.
*/
static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
{
svc_fh *fh;
struct posix_acl *acl;
__be32 nfserr = 0;
fh = fh_copy(&resp->fh, &argp->fh);
if ((nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP)))
RETURN_STATUS(nfserr);
if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
RETURN_STATUS(nfserr_inval);
resp->mask = argp->mask;
if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
if (IS_ERR(acl)) {
int err = PTR_ERR(acl);
if (err == -ENODATA || err == -EOPNOTSUPP)
acl = NULL;
else {
nfserr = nfserrno(err);
goto fail;
}
}
if (acl == NULL) {
/* Solaris returns the inode's minimum ACL. */
struct inode *inode = fh->fh_dentry->d_inode;
acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
}
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 = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
if (IS_ERR(acl)) {
int err = PTR_ERR(acl);
if (err == -ENODATA || err == -EOPNOTSUPP)
acl = NULL;
else {
nfserr = nfserrno(err);
goto fail;
}
}
resp->acl_default = acl;
}
/* resp->acl_{access,default} are released in nfs3svc_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 nfsd3_proc_setacl(struct svc_rqst * rqstp,
struct nfsd3_setaclargs *argp,
struct nfsd3_attrstat *resp)
{
svc_fh *fh;
__be32 nfserr = 0;
fh = fh_copy(&resp->fh, &argp->fh);
nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_SATTR);
if (!nfserr) {
nfserr = nfserrno( nfsd_set_posix_acl(
fh, ACL_TYPE_ACCESS, argp->acl_access) );
}
if (!nfserr) {
nfserr = nfserrno( nfsd_set_posix_acl(
fh, ACL_TYPE_DEFAULT, argp->acl_default) );
}
/* argp->acl_{access,default} may have been allocated in
nfs3svc_decode_setaclargs. */
posix_acl_release(argp->acl_access);
posix_acl_release(argp->acl_default);
RETURN_STATUS(nfserr);
}
/*
* XDR decode functions
*/
static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd3_getaclargs *args)
{
if (!(p = nfs3svc_decode_fh(p, &args->fh)))
return 0;
args->mask = ntohl(*p); p++;
return xdr_argsize_check(rqstp, p);
}
static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
struct nfsd3_setaclargs *args)
{
struct kvec *head = rqstp->rq_arg.head;
unsigned int base;
int n;
if (!(p = nfs3svc_decode_fh(p, &args->fh)))
return 0;
args->mask = ntohl(*p++);
if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
!xdr_argsize_check(rqstp, p))
return 0;
base = (char *)p - (char *)head->iov_base;
n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
(args->mask & NFS_ACL) ?
&args->acl_access : NULL);
if (n > 0)
n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
(args->mask & NFS_DFACL) ?
&args->acl_default : NULL);
return (n > 0);
}
/*
* XDR encode functions
*/
/* GETACL */
static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd3_getaclres *resp)
{
struct dentry *dentry = resp->fh.fh_dentry;
p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
if (resp->status == 0 && dentry && dentry->d_inode) {
struct inode *inode = dentry->d_inode;
struct kvec *head = rqstp->rq_res.head;
unsigned int base;
int n;
int w;
*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_respages[rqstp->rq_resused++])
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);
if (n <= 0)
return 0;
} else
if (!xdr_ressize_check(rqstp, p))
return 0;
return 1;
}
/* SETACL */
static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd3_attrstat *resp)
{
p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
return xdr_ressize_check(rqstp, p);
}
/*
* XDR release functions
*/
static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
struct nfsd3_getaclres *resp)
{
fh_put(&resp->fh);
posix_acl_release(resp->acl_access);
posix_acl_release(resp->acl_default);
return 1;
}
#define nfs3svc_decode_voidargs NULL
#define nfs3svc_release_void NULL
#define nfsd3_setaclres nfsd3_attrstat
#define nfsd3_voidres nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };
#define PROC(name, argt, rest, relt, cache, respsize) \
{ (svc_procfunc) nfsd3_proc_##name, \
(kxdrproc_t) nfs3svc_decode_##argt##args, \
(kxdrproc_t) nfs3svc_encode_##rest##res, \
(kxdrproc_t) nfs3svc_release_##relt, \
sizeof(struct nfsd3_##argt##args), \
sizeof(struct nfsd3_##rest##res), \
0, \
cache, \
respsize, \
}
#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 struct svc_procedure nfsd_acl_procedures3[] = {
PROC(null, void, void, void, RC_NOCACHE, ST),
PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
};
struct svc_version nfsd_acl_version3 = {
.vs_vers = 3,
.vs_nproc = 3,
.vs_proc = nfsd_acl_procedures3,
.vs_dispatch = nfsd_dispatch,
.vs_xdrsize = NFS3_SVC_XDRSIZE,
.vs_hidden = 1,
};