source3/modules/gpfs.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Provide a connection to GPFS specific features
   4  *  Copyright (C) Volker Lendecke 2005
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/smbd.h"
  23
  24 #include "libcli/security/security.h"
  25 #include "gpfs_fcntl.h"
  26 #include "gpfs_gpl.h"
  27 #include "vfs_gpfs.h"
  28
  29 static int (*gpfs_set_share_fn)(int fd, unsigned int allow, unsigned int deny);
  30 static int (*gpfs_set_lease_fn)(int fd, unsigned int leaseType);
  31 static int (*gpfs_getacl_fn)(char *pathname, int flags, void *acl);
  32 static int (*gpfs_putacl_fn)(char *pathname, int flags, void *acl);
  33 static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
  34                                             int *buflen);
  35 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
  36 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
  37 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  38 static int (*gpfs_prealloc_fn)(int fd, gpfs_off64_t startOffset, gpfs_off64_t bytesToPrealloc);
  39 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  40 static int (*gpfs_lib_init_fn)(int flags);
  41 static int (*gpfs_quotactl_fn)(char *pathname, int cmd, int id, void *bufferP);
  42 static int (*gpfs_fcntl_fn)(gpfs_file_t fileDesc, void *fcntlArgP);
  43 static int (*gpfs_getfilesetid_fn)(char *pathname, char *name, int *idP);
  44
  45 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
  46                         uint32 share_access)
  47 {
  48         unsigned int allow = GPFS_SHARE_NONE;
  49         unsigned int deny = GPFS_DENY_NONE;
  50         int result;
  51
  52         if (gpfs_set_share_fn == NULL) {
  53                 return False;
  54         }
  55
  56         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
  57                 /* No real file, don't disturb */
  58                 return True;
  59         }
  60
  61         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
  62                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
  63         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
  64                 GPFS_SHARE_READ : 0;
  65
  66         if (allow == GPFS_SHARE_NONE) {
  67                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
  68         }
  69         else {
  70                 deny |= (share_access & FILE_SHARE_WRITE) ?
  71                         0 : GPFS_DENY_WRITE;
  72                 deny |= (share_access & (FILE_SHARE_READ)) ?
  73                         0 : GPFS_DENY_READ;
  74         }
  75         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
  76                    access_mask, allow, share_access, deny));
  77
  78         result = gpfs_set_share_fn(fsp->fh->fd, allow, deny);
  79         if (result != 0) {
  80                 if (errno == ENOSYS) {
  81                         DEBUG(5, ("VFS module vfs_gpfs loaded, but no gpfs "
  82                                   "support has been compiled into Samba. Allowing access\n"));
  83                         return True;
  84                 } else {
  85                         DEBUG(10, ("gpfs_set_share failed: %s\n",
  86                                    strerror(errno)));
  87                 }
  88         }
  89
  90         return (result == 0);
  91 }
  92
  93 int set_gpfs_lease(int fd, int leasetype)
  94 {
  95         int gpfs_type = GPFS_LEASE_NONE;
  96
  97         if (gpfs_set_lease_fn == NULL) {
  98                 errno = EINVAL;
  99                 return -1;
 100         }
 101
 102         if (leasetype == F_RDLCK) {
 103                 gpfs_type = GPFS_LEASE_READ;
 104         }
 105         if (leasetype == F_WRLCK) {
 106                 gpfs_type = GPFS_LEASE_WRITE;
 107         }
 108
 109         /* we unconditionally set CAP_LEASE, rather than looking for
 110            -1/EACCES as there is a bug in some versions of
 111            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 112            each time we try this with the wrong capabilities set
 113         */
 114         linux_set_lease_capability();
 115         return gpfs_set_lease_fn(fd, gpfs_type);
 116 }
 117
 118 int smbd_gpfs_getacl(char *pathname, int flags, void *acl)
 119 {
 120         if (gpfs_getacl_fn == NULL) {
 121                 errno = ENOSYS;
 122                 return -1;
 123         }
 124
 125         return gpfs_getacl_fn(pathname, flags, acl);
 126 }
 127
 128 int smbd_gpfs_putacl(char *pathname, int flags, void *acl)
 129 {
 130         if (gpfs_putacl_fn == NULL) {
 131                 errno = ENOSYS;
 132                 return -1;
 133         }
 134
 135         return gpfs_putacl_fn(pathname, flags, acl);
 136 }
 137
 138 int smbd_gpfs_ftruncate(int fd, gpfs_off64_t length)
 139 {
 140         if (gpfs_ftruncate_fn == NULL) {
 141                 errno = ENOSYS;
 142                 return -1;
 143         }
 144
 145         return gpfs_ftruncate_fn(fd, length);
 146 }
 147
 148 int smbd_gpfs_get_realfilename_path(char *pathname, char *filenamep,
 149                                     int *buflen)
 150 {
 151         if (gpfs_get_realfilename_path_fn == NULL) {
 152                 errno = ENOSYS;
 153                 return -1;
 154         }
 155
 156         return gpfs_get_realfilename_path_fn(pathname, filenamep, buflen);
 157 }
 158
 159 int get_gpfs_winattrs(char *pathname,struct gpfs_winattr *attrs)
 160 {
 161
 162         if (gpfs_get_winattrs_path_fn == NULL) {
 163                 errno = ENOSYS;
 164                 return -1;
 165         }
 166         DEBUG(10, ("gpfs_get_winattrs_path:open call %s\n",pathname));
 167         return gpfs_get_winattrs_path_fn(pathname, attrs);
 168 }
 169
 170 int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
 171 {
 172
 173         if (gpfs_get_winattrs_fn == NULL) {
 174                 errno = ENOSYS;
 175                 return -1;
 176         }
 177         DEBUG(10, ("gpfs_get_winattrs_path:open call %d\n", fd));
 178         return gpfs_get_winattrs_fn(fd, attrs);
 179 }
 180
 181 int smbd_gpfs_prealloc(int fd, gpfs_off64_t start, gpfs_off64_t bytes)
 182 {
 183         if (gpfs_prealloc_fn == NULL) {
 184                 errno = ENOSYS;
 185                 return -1;
 186         }
 187
 188         return gpfs_prealloc_fn(fd, start, bytes);
 189 }
 190
 191 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 192 {
 193         if (gpfs_set_winattrs_path_fn == NULL) {
 194                 errno = ENOSYS;
 195                 return -1;
 196         }
 197
 198         DEBUG(10, ("gpfs_set_winattrs_path:open call %s\n",pathname));
 199         return gpfs_set_winattrs_path_fn(pathname,flags, attrs);
 200 }
 201
 202 int get_gpfs_quota(const char *pathname, int type, int id,
 203                    struct gpfs_quotaInfo *qi)
 204 {
 205         int ret;
 206
 207         if (!gpfs_quotactl_fn) {
 208                 errno = ENOSYS;
 209                 return -1;
 210         }
 211
 212         ZERO_STRUCTP(qi);
 213         ret = gpfs_quotactl_fn(discard_const_p(char, pathname),
 214                                GPFS_QCMD(Q_GETQUOTA, type), id, qi);
 215
 216         if (ret) {
 217                 if (errno == GPFS_E_NO_QUOTA_INST) {
 218                         DEBUG(10, ("Quotas disabled on GPFS filesystem.\n"));
 219                 } else {
 220                         DEBUG(0, ("Get quota failed, type %d, id, %d, "
 221                                   "errno %d.\n", type, id, errno));
 222                 }
 223
 224                 return ret;
 225         }
 226
 227         DEBUG(10, ("quota type %d, id %d, blk u:%lld h:%lld s:%lld gt:%u\n",
 228                    type, id, qi->blockUsage, qi->blockHardLimit,
 229                    qi->blockSoftLimit, qi->blockGraceTime));
 230
 231         return ret;
 232 }
 233
 234 int get_gpfs_fset_id(const char *pathname, int *fset_id)
 235 {
 236         int err, fd, errno_fcntl;
 237
 238         struct {
 239                 gpfsFcntlHeader_t hdr;
 240                 gpfsGetFilesetName_t fsn;
 241         } arg;
 242
 243         if (!gpfs_fcntl_fn || !gpfs_getfilesetid_fn) {
 244                 errno = ENOSYS;
 245                 return -1;
 246         }
 247
 248         arg.hdr.totalLength = sizeof(arg);
 249         arg.hdr.fcntlVersion = GPFS_FCNTL_CURRENT_VERSION;
 250         arg.hdr.fcntlReserved = 0;
 251         arg.fsn.structLen = sizeof(arg.fsn);
 252         arg.fsn.structType = GPFS_FCNTL_GET_FILESETNAME;
 253
 254         fd = open(pathname, O_RDONLY);
 255         if (fd == -1)
 256                 return fd;
 257
 258         err = gpfs_fcntl_fn(fd, &arg);
 259         errno_fcntl = errno;
 260         close(fd);
 261
 262         if (err) {
 263                 errno = errno_fcntl;
 264                 return err;
 265         }
 266
 267         return gpfs_getfilesetid_fn(discard_const_p(char, pathname),
 268                                     arg.fsn.buffer, fset_id);
 269 }
 270
 271 void smbd_gpfs_lib_init()
 272 {
 273         if (gpfs_lib_init_fn) {
 274                 int rc = gpfs_lib_init_fn(0);
 275                 DEBUG(10, ("gpfs_lib_init() finished with rc %d "
 276                            "and errno %d\n", rc, errno));
 277         } else {
 278                 DEBUG(10, ("libgpfs lacks gpfs_lib_init\n"));
 279         }
 280 }
 281
 282 static bool init_gpfs_function_lib(void *plibhandle_pointer,
 283                                    const char *libname,
 284                                    void *pfn_pointer, const char *fn_name)
 285 {
 286         bool did_open_here = false;
 287         void **libhandle_pointer = (void **)plibhandle_pointer;
 288         void **fn_pointer = (void **)pfn_pointer;
 289
 290         DEBUG(10, ("trying to load name %s from %s\n",
 291                    fn_name, libname));
 292
 293         if (*libhandle_pointer == NULL) {
 294                 *libhandle_pointer = dlopen(libname, RTLD_LAZY);
 295                 did_open_here = true;
 296         }
 297         if (*libhandle_pointer == NULL) {
 298                 DEBUG(10, ("Could not open lib %s\n", libname));
 299                 return false;
 300         }
 301
 302         *fn_pointer = dlsym(*libhandle_pointer, fn_name);
 303         if (*fn_pointer == NULL) {
 304                 DEBUG(10, ("Did not find symbol %s in lib %s\n",
 305                            fn_name, libname));
 306                 if (did_open_here) {
 307                         dlclose(*libhandle_pointer);
 308                         *libhandle_pointer = NULL;
 309                 }
 310                 return false;
 311         }
 312
 313         return true;
 314 }
 315
 316 static bool init_gpfs_function(void *fn_pointer, const char *fn_name)
 317 {
 318         static void *libgpfs_handle = NULL;
 319         static void *libgpfs_gpl_handle = NULL;
 320
 321         if (init_gpfs_function_lib(&libgpfs_handle, "libgpfs.so",
 322                                    fn_pointer, fn_name)) {
 323                 return true;
 324         }
 325         if (init_gpfs_function_lib(&libgpfs_gpl_handle, "libgpfs_gpl.so",
 326                                    fn_pointer, fn_name)) {
 327                 return true;
 328         }
 329         return false;
 330 }
 331
 332 void init_gpfs(void)
 333 {
 334         init_gpfs_function(&gpfs_set_share_fn, "gpfs_set_share");
 335         init_gpfs_function(&gpfs_set_lease_fn, "gpfs_set_lease");
 336         init_gpfs_function(&gpfs_getacl_fn, "gpfs_getacl");
 337         init_gpfs_function(&gpfs_putacl_fn, "gpfs_putacl");
 338         init_gpfs_function(&gpfs_get_realfilename_path_fn,
 339                            "gpfs_get_realfilename_path");
 340         init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
 341         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
 342         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
 343         init_gpfs_function(&gpfs_prealloc_fn, "gpfs_prealloc");
 344         init_gpfs_function(&gpfs_ftruncate_fn, "gpfs_ftruncate");
 345         init_gpfs_function(&gpfs_lib_init_fn,"gpfs_lib_init");
 346         init_gpfs_function(&gpfs_quotactl_fn, "gpfs_quotactl");
 347         init_gpfs_function(&gpfs_fcntl_fn, "gpfs_fcntl");
 348         init_gpfs_function(&gpfs_getfilesetid_fn, "gpfs_getfilesetid");
 349
 350         return;
 351 }