fs/nfsd/nfs3acl.c

   1 /*
   2  * Process version 3 NFSACL requests.
   3  *
   4  * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
   5  */
   6
   7 #include "nfsd.h"
   8 /* FIXME: nfsacl.h is a broken header */
   9 #include <linux/nfsacl.h>
  10 #include <linux/gfp.h>
  11 #include "cache.h"
  12 #include "xdr3.h"
  13 #include "vfs.h"
  14
  15 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  16
  17 /*
  18  * NULL call.
  19  */
  20 static __be32
  21 nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  22 {
  23         return nfs_ok;
  24 }
  25
  26 /*
  27  * Get the Access and/or Default ACL of a file.
  28  */
  29 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
  30                 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  31 {
  32         struct posix_acl *acl;
  33         struct inode *inode;
  34         svc_fh *fh;
  35         __be32 nfserr = 0;
  36
  37         fh = fh_copy(&resp->fh, &argp->fh);
  38         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  39         if (nfserr)
  40                 RETURN_STATUS(nfserr);
  41
  42         inode = d_inode(fh->fh_dentry);
  43
  44         if (argp->mask & ~NFS_ACL_MASK)
  45                 RETURN_STATUS(nfserr_inval);
  46         resp->mask = argp->mask;
  47
  48         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  49                 acl = get_acl(inode, ACL_TYPE_ACCESS);
  50                 if (acl == NULL) {
  51                         /* Solaris returns the inode's minimum ACL. */
  52                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  53                 }
  54                 if (IS_ERR(acl)) {
  55                         nfserr = nfserrno(PTR_ERR(acl));
  56                         goto fail;
  57                 }
  58                 resp->acl_access = acl;
  59         }
  60         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  61                 /* Check how Solaris handles requests for the Default ACL
  62                    of a non-directory! */
  63                 acl = get_acl(inode, ACL_TYPE_DEFAULT);
  64                 if (IS_ERR(acl)) {
  65                         nfserr = nfserrno(PTR_ERR(acl));
  66                         goto fail;
  67                 }
  68                 resp->acl_default = acl;
  69         }
  70
  71         /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
  72         RETURN_STATUS(0);
  73
  74 fail:
  75         posix_acl_release(resp->acl_access);
  76         posix_acl_release(resp->acl_default);
  77         RETURN_STATUS(nfserr);
  78 }
  79
  80 /*
  81  * Set the Access and/or Default ACL of a file.
  82  */
  83 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
  84                 struct nfsd3_setaclargs *argp,
  85                 struct nfsd3_attrstat *resp)
  86 {
  87         struct inode *inode;
  88         svc_fh *fh;
  89         __be32 nfserr = 0;
  90         int error;
  91
  92         fh = fh_copy(&resp->fh, &argp->fh);
  93         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
  94         if (nfserr)
  95                 goto out;
  96
  97         inode = d_inode(fh->fh_dentry);
  98
  99         error = fh_want_write(fh);
 100         if (error)
 101                 goto out_errno;
 102
 103         fh_lock(fh);
 104
 105         error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
 106         if (error)
 107                 goto out_drop_lock;
 108         error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
 109
 110 out_drop_lock:
 111         fh_unlock(fh);
 112         fh_drop_write(fh);
 113 out_errno:
 114         nfserr = nfserrno(error);
 115 out:
 116         /* argp->acl_{access,default} may have been allocated in
 117            nfs3svc_decode_setaclargs. */
 118         posix_acl_release(argp->acl_access);
 119         posix_acl_release(argp->acl_default);
 120         RETURN_STATUS(nfserr);
 121 }
 122
 123 /*
 124  * XDR decode functions
 125  */
 126 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 127                 struct nfsd3_getaclargs *args)
 128 {
 129         p = nfs3svc_decode_fh(p, &args->fh);
 130         if (!p)
 131                 return 0;
 132         args->mask = ntohl(*p); p++;
 133
 134         return xdr_argsize_check(rqstp, p);
 135 }
 136
 137
 138 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 139                 struct nfsd3_setaclargs *args)
 140 {
 141         struct kvec *head = rqstp->rq_arg.head;
 142         unsigned int base;
 143         int n;
 144
 145         p = nfs3svc_decode_fh(p, &args->fh);
 146         if (!p)
 147                 return 0;
 148         args->mask = ntohl(*p++);
 149         if (args->mask & ~NFS_ACL_MASK ||
 150             !xdr_argsize_check(rqstp, p))
 151                 return 0;
 152
 153         base = (char *)p - (char *)head->iov_base;
 154         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 155                           (args->mask & NFS_ACL) ?
 156                           &args->acl_access : NULL);
 157         if (n > 0)
 158                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 159                                   (args->mask & NFS_DFACL) ?
 160                                   &args->acl_default : NULL);
 161         return (n > 0);
 162 }
 163
 164 /*
 165  * XDR encode functions
 166  */
 167
 168 /* GETACL */
 169 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 170                 struct nfsd3_getaclres *resp)
 171 {
 172         struct dentry *dentry = resp->fh.fh_dentry;
 173
 174         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 175         if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
 176                 struct inode *inode = d_inode(dentry);
 177                 struct kvec *head = rqstp->rq_res.head;
 178                 unsigned int base;
 179                 int n;
 180                 int w;
 181
 182                 *p++ = htonl(resp->mask);
 183                 if (!xdr_ressize_check(rqstp, p))
 184                         return 0;
 185                 base = (char *)p - (char *)head->iov_base;
 186
 187                 rqstp->rq_res.page_len = w = nfsacl_size(
 188                         (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 189                         (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 190                 while (w > 0) {
 191                         if (!*(rqstp->rq_next_page++))
 192                                 return 0;
 193                         w -= PAGE_SIZE;
 194                 }
 195
 196                 n = nfsacl_encode(&rqstp->rq_res, base, inode,
 197                                   resp->acl_access,
 198                                   resp->mask & NFS_ACL, 0);
 199                 if (n > 0)
 200                         n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 201                                           resp->acl_default,
 202                                           resp->mask & NFS_DFACL,
 203                                           NFS_ACL_DEFAULT);
 204                 if (n <= 0)
 205                         return 0;
 206         } else
 207                 if (!xdr_ressize_check(rqstp, p))
 208                         return 0;
 209
 210         return 1;
 211 }
 212
 213 /* SETACL */
 214 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
 215                 struct nfsd3_attrstat *resp)
 216 {
 217         p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
 218
 219         return xdr_ressize_check(rqstp, p);
 220 }
 221
 222 /*
 223  * XDR release functions
 224  */
 225 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 226                 struct nfsd3_getaclres *resp)
 227 {
 228         fh_put(&resp->fh);
 229         posix_acl_release(resp->acl_access);
 230         posix_acl_release(resp->acl_default);
 231         return 1;
 232 }
 233
 234 #define nfs3svc_decode_voidargs         NULL
 235 #define nfs3svc_release_void            NULL
 236 #define nfsd3_setaclres                 nfsd3_attrstat
 237 #define nfsd3_voidres                   nfsd3_voidargs
 238 struct nfsd3_voidargs { int dummy; };
 239
 240 #define PROC(name, argt, rest, relt, cache, respsize)   \
 241  { (svc_procfunc) nfsd3_proc_##name,            \
 242    (kxdrproc_t) nfs3svc_decode_##argt##args,    \
 243    (kxdrproc_t) nfs3svc_encode_##rest##res,     \
 244    (kxdrproc_t) nfs3svc_release_##relt,         \
 245    sizeof(struct nfsd3_##argt##args),           \
 246    sizeof(struct nfsd3_##rest##res),            \
 247    0,                                           \
 248    cache,                                       \
 249    respsize,                                    \
 250  }
 251
 252 #define ST 1            /* status*/
 253 #define AT 21           /* attributes */
 254 #define pAT (1+AT)      /* post attributes - conditional */
 255 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 256
 257 static struct svc_procedure             nfsd_acl_procedures3[] = {
 258   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 259   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 260   PROC(setacl,  setacl,         setacl,         fhandle,  RC_NOCACHE, ST+pAT),
 261 };
 262
 263 struct svc_version      nfsd_acl_version3 = {
 264                 .vs_vers        = 3,
 265                 .vs_nproc       = 3,
 266                 .vs_proc        = nfsd_acl_procedures3,
 267                 .vs_dispatch    = nfsd_dispatch,
 268                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 269                 .vs_hidden      = 0,
 270 };
 271