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4452435948
We are planning to increase RPCSVC_MAXPAGES from about 8 to about 256. This means we need to be a bit careful about arrays of size RPCSVC_MAXPAGES. struct svc_rqst contains two such arrays. However the there are never more that RPCSVC_MAXPAGES pages in the two arrays together, so only one array is needed. The two arrays are for the pages holding the request, and the pages holding the reply. Instead of two arrays, we can simply keep an index into where the first reply page is. This patch also removes a number of small inline functions that probably server to obscure what is going on rather than clarify it, and opencode the needed functionality. Also remove the 'rq_restailpage' variable as it is *always* 0. i.e. if the response 'xdr' structure has a non-empty tail it is always in the same pages as the head. check counters are initilised and incr properly check for consistant usage of ++ etc maybe extra some inlines for common approach general review Signed-off-by: Neil Brown <neilb@suse.de> Cc: Magnus Maatta <novell@kiruna.se> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
267 lines
6.3 KiB
C
267 lines
6.3 KiB
C
/*
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* linux/fs/nfsd/nfs3acl.c
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*
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* Process version 3 NFSACL requests.
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*
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* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
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*/
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#include <linux/sunrpc/svc.h>
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#include <linux/nfs3.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfsd/cache.h>
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#include <linux/nfsd/xdr3.h>
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#include <linux/posix_acl.h>
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#include <linux/nfsacl.h>
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#define RETURN_STATUS(st) { resp->status = (st); return (st); }
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/*
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* NULL call.
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*/
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static int
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nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
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{
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return nfs_ok;
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}
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/*
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* Get the Access and/or Default ACL of a file.
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*/
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static int nfsd3_proc_getacl(struct svc_rqst * rqstp,
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struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
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{
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svc_fh *fh;
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struct posix_acl *acl;
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int nfserr = 0;
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fh = fh_copy(&resp->fh, &argp->fh);
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if ((nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP)))
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RETURN_STATUS(nfserr_inval);
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if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
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RETURN_STATUS(nfserr_inval);
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resp->mask = argp->mask;
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if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
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acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
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if (IS_ERR(acl)) {
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int err = PTR_ERR(acl);
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if (err == -ENODATA || err == -EOPNOTSUPP)
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acl = NULL;
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else {
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nfserr = nfserrno(err);
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goto fail;
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}
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}
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if (acl == NULL) {
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/* Solaris returns the inode's minimum ACL. */
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struct inode *inode = fh->fh_dentry->d_inode;
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acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
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}
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resp->acl_access = acl;
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}
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if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
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/* Check how Solaris handles requests for the Default ACL
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of a non-directory! */
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acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl)) {
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int err = PTR_ERR(acl);
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if (err == -ENODATA || err == -EOPNOTSUPP)
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acl = NULL;
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else {
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nfserr = nfserrno(err);
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goto fail;
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}
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}
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resp->acl_default = acl;
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}
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/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
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RETURN_STATUS(0);
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fail:
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posix_acl_release(resp->acl_access);
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posix_acl_release(resp->acl_default);
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RETURN_STATUS(nfserr);
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}
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/*
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* Set the Access and/or Default ACL of a file.
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*/
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static int nfsd3_proc_setacl(struct svc_rqst * rqstp,
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struct nfsd3_setaclargs *argp,
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struct nfsd3_attrstat *resp)
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{
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svc_fh *fh;
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int nfserr = 0;
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fh = fh_copy(&resp->fh, &argp->fh);
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nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_SATTR);
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if (!nfserr) {
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nfserr = nfserrno( nfsd_set_posix_acl(
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fh, ACL_TYPE_ACCESS, argp->acl_access) );
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}
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if (!nfserr) {
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nfserr = nfserrno( nfsd_set_posix_acl(
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fh, ACL_TYPE_DEFAULT, argp->acl_default) );
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}
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/* argp->acl_{access,default} may have been allocated in
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nfs3svc_decode_setaclargs. */
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posix_acl_release(argp->acl_access);
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posix_acl_release(argp->acl_default);
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RETURN_STATUS(nfserr);
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}
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/*
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* XDR decode functions
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*/
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static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd3_getaclargs *args)
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{
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if (!(p = nfs3svc_decode_fh(p, &args->fh)))
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return 0;
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args->mask = ntohl(*p); p++;
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return xdr_argsize_check(rqstp, p);
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}
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static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, u32 *p,
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struct nfsd3_setaclargs *args)
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{
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struct kvec *head = rqstp->rq_arg.head;
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unsigned int base;
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int n;
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if (!(p = nfs3svc_decode_fh(p, &args->fh)))
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return 0;
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args->mask = ntohl(*p++);
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if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
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!xdr_argsize_check(rqstp, p))
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return 0;
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base = (char *)p - (char *)head->iov_base;
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n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
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(args->mask & NFS_ACL) ?
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&args->acl_access : NULL);
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if (n > 0)
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n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
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(args->mask & NFS_DFACL) ?
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&args->acl_default : NULL);
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return (n > 0);
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}
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/*
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* XDR encode functions
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*/
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/* GETACL */
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static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd3_getaclres *resp)
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{
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struct dentry *dentry = resp->fh.fh_dentry;
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p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
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if (resp->status == 0 && dentry && dentry->d_inode) {
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struct inode *inode = dentry->d_inode;
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int w = nfsacl_size(
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(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
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(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
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struct kvec *head = rqstp->rq_res.head;
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unsigned int base;
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int n;
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*p++ = htonl(resp->mask);
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if (!xdr_ressize_check(rqstp, p))
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return 0;
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base = (char *)p - (char *)head->iov_base;
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rqstp->rq_res.page_len = w;
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while (w > 0) {
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if (!rqstp->rq_respages[rqstp->rq_resused++])
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return 0;
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w -= PAGE_SIZE;
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}
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n = nfsacl_encode(&rqstp->rq_res, base, inode,
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resp->acl_access,
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resp->mask & NFS_ACL, 0);
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if (n > 0)
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n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
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resp->acl_default,
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resp->mask & NFS_DFACL,
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NFS_ACL_DEFAULT);
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if (n <= 0)
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return 0;
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} else
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if (!xdr_ressize_check(rqstp, p))
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return 0;
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return 1;
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}
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/* SETACL */
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static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, u32 *p,
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struct nfsd3_attrstat *resp)
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{
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p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
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return xdr_ressize_check(rqstp, p);
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}
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/*
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* XDR release functions
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*/
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static int nfs3svc_release_getacl(struct svc_rqst *rqstp, u32 *p,
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struct nfsd3_getaclres *resp)
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{
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fh_put(&resp->fh);
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posix_acl_release(resp->acl_access);
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posix_acl_release(resp->acl_default);
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return 1;
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}
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#define nfs3svc_decode_voidargs NULL
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#define nfs3svc_release_void NULL
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#define nfsd3_setaclres nfsd3_attrstat
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#define nfsd3_voidres nfsd3_voidargs
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struct nfsd3_voidargs { int dummy; };
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#define PROC(name, argt, rest, relt, cache, respsize) \
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{ (svc_procfunc) nfsd3_proc_##name, \
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(kxdrproc_t) nfs3svc_decode_##argt##args, \
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(kxdrproc_t) nfs3svc_encode_##rest##res, \
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(kxdrproc_t) nfs3svc_release_##relt, \
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sizeof(struct nfsd3_##argt##args), \
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sizeof(struct nfsd3_##rest##res), \
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0, \
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cache, \
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respsize, \
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}
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#define ST 1 /* status*/
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#define AT 21 /* attributes */
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#define pAT (1+AT) /* post attributes - conditional */
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#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
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static struct svc_procedure nfsd_acl_procedures3[] = {
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PROC(null, void, void, void, RC_NOCACHE, ST),
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PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
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PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
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};
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struct svc_version nfsd_acl_version3 = {
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.vs_vers = 3,
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.vs_nproc = 3,
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.vs_proc = nfsd_acl_procedures3,
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.vs_dispatch = nfsd_dispatch,
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.vs_xdrsize = NFS3_SVC_XDRSIZE,
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};
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