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 <fcntl.h>
  25 #include <gpfs_fcntl.h>
  26 #include "libcli/security/security.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 type);
  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 *len);
  35 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags,
  36                                         struct gpfs_winattr *attrs);
  37 static int (*gpfs_get_winattrs_path_fn)(char *pathname,
  38                                         struct gpfs_winattr *attrs);
  39 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
  40 static int (*gpfs_prealloc_fn)(int fd, gpfs_off64_t start, gpfs_off64_t bytes);
  41 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
  42 static int (*gpfs_lib_init_fn)(int flags);
  43 static int (*gpfs_set_times_path_fn)(char *pathname, int flags,
  44                                      gpfs_timestruc_t times[4]);
  45 static int (*gpfs_quotactl_fn)(char *pathname, int cmd, int id, void *bufferP);
  46 static int (*gpfs_fcntl_fn)(gpfs_file_t fileDesc, void *fcntlArgP);
  47 static int (*gpfs_getfilesetid_fn)(char *pathname, char *name, int *idP);
  48
  49 int gpfswrap_init(void)
  50 {
  51         static void *l;
  52
  53         if (l != NULL) {
  54                 return 0;
  55         }
  56
  57         l = dlopen("libgpfs.so", RTLD_LAZY);
  58         if (l == NULL) {
  59                 return -1;
  60         }
  61
  62         gpfs_set_share_fn             = dlsym(l, "gpfs_set_share");
  63         gpfs_set_lease_fn             = dlsym(l, "gpfs_set_lease");
  64         gpfs_getacl_fn                = dlsym(l, "gpfs_getacl");
  65         gpfs_putacl_fn                = dlsym(l, "gpfs_putacl");
  66         gpfs_get_realfilename_path_fn = dlsym(l, "gpfs_get_realfilename_path");
  67         gpfs_set_winattrs_path_fn     = dlsym(l, "gpfs_set_winattrs_path");
  68         gpfs_get_winattrs_path_fn     = dlsym(l, "gpfs_get_winattrs_path");
  69         gpfs_get_winattrs_fn          = dlsym(l, "gpfs_get_winattrs");
  70         gpfs_prealloc_fn              = dlsym(l, "gpfs_prealloc");
  71         gpfs_ftruncate_fn             = dlsym(l, "gpfs_ftruncate");
  72         gpfs_lib_init_fn              = dlsym(l, "gpfs_lib_init");
  73         gpfs_set_times_path_fn        = dlsym(l, "gpfs_set_times_path");
  74         gpfs_quotactl_fn              = dlsym(l, "gpfs_quotactl");
  75         gpfs_fcntl_fn                 = dlsym(l, "gpfs_fcntl");
  76         gpfs_getfilesetid_fn          = dlsym(l, "gpfs_getfilesetid");
  77
  78         return 0;
  79 }
  80
  81 int gpfswrap_set_share(int fd, unsigned int allow, unsigned int deny)
  82 {
  83         if (gpfs_set_share_fn == NULL) {
  84                 errno = ENOSYS;
  85                 return -1;
  86         }
  87
  88         return gpfs_set_share_fn(fd, allow, deny);
  89 }
  90
  91 int gpfswrap_set_lease(int fd, unsigned int type)
  92 {
  93         if (gpfs_set_lease_fn == NULL) {
  94                 errno = ENOSYS;
  95                 return -1;
  96         }
  97
  98         return gpfs_set_lease_fn(fd, type);
  99 }
 100
 101 int gpfswrap_getacl(char *pathname, int flags, void *acl)
 102 {
 103         if (gpfs_getacl_fn == NULL) {
 104                 errno = ENOSYS;
 105                 return -1;
 106         }
 107
 108         return gpfs_getacl_fn(pathname, flags, acl);
 109 }
 110
 111 int gpfswrap_putacl(char *pathname, int flags, void *acl)
 112 {
 113         if (gpfs_putacl_fn == NULL) {
 114                 errno = ENOSYS;
 115                 return -1;
 116         }
 117
 118         return gpfs_putacl_fn(pathname, flags, acl);
 119 }
 120
 121 int gpfswrap_get_realfilename_path(char *pathname, char *filenamep, int *len)
 122 {
 123         if (gpfs_get_realfilename_path_fn == NULL) {
 124                 errno = ENOSYS;
 125                 return -1;
 126         }
 127
 128         return gpfs_get_realfilename_path_fn(pathname, filenamep, len);
 129 }
 130
 131 int gpfswrap_set_winattrs_path(char *pathname, int flags,
 132                                struct gpfs_winattr *attrs)
 133 {
 134         if (gpfs_set_winattrs_path_fn == NULL) {
 135                 errno = ENOSYS;
 136                 return -1;
 137         }
 138
 139         return gpfs_set_winattrs_path_fn(pathname, flags, attrs);
 140 }
 141
 142 int gpfswrap_get_winattrs_path(char *pathname, struct gpfs_winattr *attrs)
 143 {
 144         if (gpfs_get_winattrs_path_fn == NULL) {
 145                 errno = ENOSYS;
 146                 return -1;
 147         }
 148
 149         return gpfs_get_winattrs_path_fn(pathname, attrs);
 150 }
 151
 152 int gpfswrap_get_winattrs(int fd, struct gpfs_winattr *attrs)
 153 {
 154         if (gpfs_get_winattrs_fn == NULL) {
 155                 errno = ENOSYS;
 156                 return -1;
 157         }
 158
 159         return gpfs_get_winattrs_fn(fd, attrs);
 160 }
 161
 162 int gpfswrap_prealloc(int fd, gpfs_off64_t start, gpfs_off64_t bytes)
 163 {
 164         if (gpfs_prealloc_fn == NULL) {
 165                 errno = ENOSYS;
 166                 return -1;
 167         }
 168
 169         return gpfs_prealloc_fn(fd, start, bytes);
 170 }
 171
 172 bool set_gpfs_sharemode(files_struct *fsp, uint32 access_mask,
 173                         uint32 share_access)
 174 {
 175         unsigned int allow = GPFS_SHARE_NONE;
 176         unsigned int deny = GPFS_DENY_NONE;
 177         int result;
 178
 179         if ((fsp == NULL) || (fsp->fh == NULL) || (fsp->fh->fd < 0)) {
 180                 /* No real file, don't disturb */
 181                 return True;
 182         }
 183
 184         allow |= (access_mask & (FILE_WRITE_DATA|FILE_APPEND_DATA|
 185                                  DELETE_ACCESS)) ? GPFS_SHARE_WRITE : 0;
 186         allow |= (access_mask & (FILE_READ_DATA|FILE_EXECUTE)) ?
 187                 GPFS_SHARE_READ : 0;
 188
 189         if (allow == GPFS_SHARE_NONE) {
 190                 DEBUG(10, ("special case am=no_access:%x\n",access_mask));
 191         }
 192         else {
 193                 deny |= (share_access & FILE_SHARE_WRITE) ?
 194                         0 : GPFS_DENY_WRITE;
 195                 deny |= (share_access & (FILE_SHARE_READ)) ?
 196                         0 : GPFS_DENY_READ;
 197         }
 198         DEBUG(10, ("am=%x, allow=%d, sa=%x, deny=%d\n",
 199                    access_mask, allow, share_access, deny));
 200
 201         result = gpfswrap_set_share(fsp->fh->fd, allow, deny);
 202         if (result != 0) {
 203                 if (errno == ENOSYS) {
 204                         DEBUG(5, ("VFS module vfs_gpfs loaded, but gpfs "
 205                                   "set_share function support not available. "
 206                                   "Allowing access\n"));
 207                         return True;
 208                 } else {
 209                         DEBUG(10, ("gpfs_set_share failed: %s\n",
 210                                    strerror(errno)));
 211                 }
 212         }
 213
 214         return (result == 0);
 215 }
 216
 217 int set_gpfs_lease(int fd, int leasetype)
 218 {
 219         int gpfs_type = GPFS_LEASE_NONE;
 220
 221         if (leasetype == F_RDLCK) {
 222                 gpfs_type = GPFS_LEASE_READ;
 223         }
 224         if (leasetype == F_WRLCK) {
 225                 gpfs_type = GPFS_LEASE_WRITE;
 226         }
 227
 228         /* we unconditionally set CAP_LEASE, rather than looking for
 229            -1/EACCES as there is a bug in some versions of
 230            libgpfs_gpl.so which results in a leaked fd on /dev/ss0
 231            each time we try this with the wrong capabilities set
 232         */
 233         linux_set_lease_capability();
 234         return gpfswrap_set_lease(fd, gpfs_type);
 235 }
 236
 237 int smbd_gpfs_ftruncate(int fd, gpfs_off64_t length)
 238 {
 239         if (gpfs_ftruncate_fn == NULL) {
 240                 errno = ENOSYS;
 241                 return -1;
 242         }
 243
 244         return gpfs_ftruncate_fn(fd, length);
 245 }
 246
 247 int get_gpfs_quota(const char *pathname, int type, int id,
 248                    struct gpfs_quotaInfo *qi)
 249 {
 250         int ret;
 251
 252         if (!gpfs_quotactl_fn) {
 253                 errno = ENOSYS;
 254                 return -1;
 255         }
 256
 257         ZERO_STRUCTP(qi);
 258         ret = gpfs_quotactl_fn(discard_const_p(char, pathname),
 259                                GPFS_QCMD(Q_GETQUOTA, type), id, qi);
 260
 261         if (ret) {
 262                 if (errno == GPFS_E_NO_QUOTA_INST) {
 263                         DEBUG(10, ("Quotas disabled on GPFS filesystem.\n"));
 264                 } else {
 265                         DEBUG(0, ("Get quota failed, type %d, id, %d, "
 266                                   "errno %d.\n", type, id, errno));
 267                 }
 268
 269                 return ret;
 270         }
 271
 272         DEBUG(10, ("quota type %d, id %d, blk u:%lld h:%lld s:%lld gt:%u\n",
 273                    type, id, qi->blockUsage, qi->blockHardLimit,
 274                    qi->blockSoftLimit, qi->blockGraceTime));
 275
 276         return ret;
 277 }
 278
 279 int get_gpfs_fset_id(const char *pathname, int *fset_id)
 280 {
 281         int err, fd, errno_fcntl;
 282
 283         struct {
 284                 gpfsFcntlHeader_t hdr;
 285                 gpfsGetFilesetName_t fsn;
 286         } arg;
 287
 288         if (!gpfs_fcntl_fn || !gpfs_getfilesetid_fn) {
 289                 errno = ENOSYS;
 290                 return -1;
 291         }
 292
 293         arg.hdr.totalLength = sizeof(arg);
 294         arg.hdr.fcntlVersion = GPFS_FCNTL_CURRENT_VERSION;
 295         arg.hdr.fcntlReserved = 0;
 296         arg.fsn.structLen = sizeof(arg.fsn);
 297         arg.fsn.structType = GPFS_FCNTL_GET_FILESETNAME;
 298
 299         fd = open(pathname, O_RDONLY);
 300         if (fd == -1) {
 301                 DEBUG(1, ("Could not open %s: %s\n",
 302                           pathname, strerror(errno)));
 303                 return fd;
 304         }
 305
 306         err = gpfs_fcntl_fn(fd, &arg);
 307         errno_fcntl = errno;
 308         close(fd);
 309
 310         if (err) {
 311                 errno = errno_fcntl;
 312                 DEBUG(1, ("GPFS_FCNTL_GET_FILESETNAME for %s failed: %s\n",
 313                           pathname, strerror(errno)));
 314                 return err;
 315         }
 316
 317         err = gpfs_getfilesetid_fn(discard_const_p(char, pathname),
 318                                    arg.fsn.buffer, fset_id);
 319         if (err) {
 320                 DEBUG(1, ("gpfs_getfilesetid for %s failed: %s\n",
 321                           pathname, strerror(errno)));
 322         }
 323         return err;
 324 }
 325
 326 void smbd_gpfs_lib_init()
 327 {
 328         if (gpfs_lib_init_fn) {
 329                 int rc = gpfs_lib_init_fn(0);
 330                 DEBUG(10, ("gpfs_lib_init() finished with rc %d "
 331                            "and errno %d\n", rc, errno));
 332         } else {
 333                 DEBUG(10, ("libgpfs lacks gpfs_lib_init\n"));
 334         }
 335 }
 336
 337 static void timespec_to_gpfs_time(struct timespec ts, gpfs_timestruc_t *gt,
 338                                   int idx, int *flags)
 339 {
 340         if (!null_timespec(ts)) {
 341                 *flags |= 1 << idx;
 342                 gt[idx].tv_sec = ts.tv_sec;
 343                 gt[idx].tv_nsec = ts.tv_nsec;
 344                 DEBUG(10, ("Setting GPFS time %d, flags 0x%x\n", idx, *flags));
 345         }
 346 }
 347
 348 int smbd_gpfs_set_times_path(char *path, struct smb_file_time *ft)
 349 {
 350         gpfs_timestruc_t gpfs_times[4];
 351         int flags = 0;
 352         int rc;
 353
 354         if (!gpfs_set_times_path_fn) {
 355                 errno = ENOSYS;
 356                 return -1;
 357         }
 358
 359         ZERO_ARRAY(gpfs_times);
 360         timespec_to_gpfs_time(ft->atime, gpfs_times, 0, &flags);
 361         timespec_to_gpfs_time(ft->mtime, gpfs_times, 1, &flags);
 362         /* No good mapping from LastChangeTime to ctime, not storing */
 363         timespec_to_gpfs_time(ft->create_time, gpfs_times, 3, &flags);
 364
 365         if (!flags) {
 366                 DEBUG(10, ("nothing to do, return to avoid EINVAL\n"));
 367                 return 0;
 368         }
 369
 370         rc = gpfs_set_times_path_fn(path, flags, gpfs_times);
 371
 372         if (rc != 0) {
 373                 DEBUG(1,("gpfs_set_times() returned with error %s\n",
 374                         strerror(errno)));
 375         }
 376
 377         return rc;
 378 }