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/*

 * 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,

};