source3/lib/sysquotas_4B.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * System QUOTA function wrappers for QUOTACTL_4B
   4
   5  * Copyright (C) 2011 James Peach.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_QUOTA
  26
  27 #ifndef HAVE_SYS_QUOTAS
  28 #undef HAVE_QUOTACTL_4B
  29 #endif
  30
  31 #ifdef HAVE_QUOTACTL_4B
  32 /* int quotactl(const char *path, int cmd, int id, char *addr)
  33  *
  34  * This is used by many (all?) BSD-derived systems. This implementation has
  35  * been developed and tested on Darwin, but may also work on other BSD systems.
  36  */
  37
  38 #ifdef HAVE_SYS_TYPES_H
  39 #include <sys/types.h>
  40 #endif
  41
  42 #ifdef HAVE_SYS_QUOTA_H
  43 #include <sys/quota.h>
  44 #endif
  45
  46 #ifdef HAVE_UFS_UFS_QUOTA_H
  47 #include <ufs/ufs/quota.h>
  48 #endif
  49
  50 #ifdef HAVE_JFS_QUOTA_H
  51 #include <jfs/quota.h>
  52 #endif
  53
  54 #if defined(DARWINOS)
  55 /* WorkARound broken HFS access checks in hfs_quotactl. Darwin only(?) */
  56 #define HFS_QUOTACTL_WAR 1
  57 #endif
  58
  59 #ifdef HAVE_STRUCT_DQBLK_DQB_CURBYTES
  60 /* we handle the byte vs. block count dynamically via QUOTABLOCK_SIZE 1 */
  61 #define dqb_curblocks dqb_curbytes
  62 #endif
  63
  64 static void xlate_qblk_to_smb(const struct dqblk * const qblk,
  65                         SMB_DISK_QUOTA *dp)
  66 {
  67         ZERO_STRUCTP(dp);
  68
  69         DEBUG(10, ("unix softlimit=%u hardlimit=%u curblock=%u\n",
  70             (unsigned)qblk->dqb_bsoftlimit, (unsigned)qblk->dqb_bhardlimit,
  71             (unsigned)qblk->dqb_curblocks));
  72
  73         DEBUGADD(10, ("unix softinodes=%u hardinodes=%u curinodes=%u\n",
  74             (unsigned)qblk->dqb_isoftlimit, (unsigned)qblk->dqb_ihardlimit,
  75             (unsigned)qblk->dqb_curinodes));
  76
  77         dp->bsize = QUOTABLOCK_SIZE;
  78
  79         dp->softlimit = qblk->dqb_bsoftlimit;
  80         dp->hardlimit = qblk->dqb_bhardlimit;
  81         dp->curblocks = qblk->dqb_curblocks;
  82 /* our Darwin quotas used to never return 0byte usage but this is probably not needed,
  83  * let's comment this out for now
  84 #ifdef HAVE_STRUCT_DQBLK_DQB_CURBYTES
  85         if (dp->curblocks == 0) {
  86                 dp->curblocks = 1;
  87         }
  88 #endif
  89  */
  90
  91         dp->ihardlimit = qblk->dqb_ihardlimit;
  92         dp->isoftlimit = qblk->dqb_isoftlimit;
  93         dp->curinodes = qblk->dqb_curinodes;
  94
  95         dp->qflags = QUOTAS_ENABLED | QUOTAS_DENY_DISK;
  96
  97         DEBUG(10, ("softlimit=%u hardlimit=%u curblock=%u\n",
  98             (unsigned)dp->softlimit, (unsigned)dp->hardlimit,
  99             (unsigned)dp->curblocks));
 100
 101         DEBUGADD(10, ("softinodes=%u hardinodes=%u curinodes=%u\n",
 102             (unsigned)dp->isoftlimit, (unsigned)dp->ihardlimit,
 103             (unsigned)dp->curinodes));
 104
 105 }
 106
 107 static void xlate_smb_to_qblk(const SMB_DISK_QUOTA * const dp,
 108                         struct dqblk *qblk)
 109 {
 110         ZERO_STRUCTP(qblk);
 111
 112         if (dp->bsize == QUOTABLOCK_SIZE) {
 113                 qblk->dqb_bsoftlimit = dp->softlimit;
 114                 qblk->dqb_bhardlimit = dp->hardlimit;
 115         } else {
 116                 qblk->dqb_bsoftlimit = dp->softlimit * dp->bsize / QUOTABLOCK_SIZE;
 117                 qblk->dqb_bhardlimit = dp->hardlimit * dp->bsize / QUOTABLOCK_SIZE;
 118         }
 119         qblk->dqb_ihardlimit = dp->ihardlimit;
 120         qblk->dqb_isoftlimit = dp->isoftlimit;
 121 }
 122
 123 static int sys_quotactl_4B(const char * path, int cmd,
 124                 int id, struct dqblk *qblk)
 125 {
 126         int ret;
 127
 128         /* NB: We must test GRPQUOTA here, because USRQUOTA is 0. */
 129         DEBUG(10, ("%s quota for %s ID %u on %s\n",
 130                     (cmd & QCMD(Q_GETQUOTA, 0)) ? "getting" : "setting",
 131                     (cmd & QCMD(0, GRPQUOTA)) ? "group" : "user",
 132                     (unsigned)id, path));
 133
 134 #ifdef HFS_QUOTACTL_WAR
 135         become_root();
 136 #endif  /* HFS_QUOTACTL_WAR */
 137
 138         ret = quotactl(path, cmd, id, qblk);
 139         if (ret == -1) {
 140                 /* ENOTSUP means quota support is not compiled in. EINVAL
 141                  * means that quotas are not configured (commonly).
 142                  */
 143                 if (errno != ENOTSUP && errno != EINVAL) {
 144                         DEBUG(0, ("failed to %s quota for %s ID %u on %s: %s\n",
 145                                     (cmd & QCMD(Q_GETQUOTA, 0)) ? "get" : "set",
 146                                     (cmd & QCMD(0, GRPQUOTA)) ? "group" : "user",
 147                                     (unsigned)id, path, strerror(errno)));
 148                 }
 149
 150 #ifdef HFS_QUOTACTL_WAR
 151                 unbecome_root();
 152 #endif  /* HFS_QUOTACTL_WAR */
 153
 154
 155                 return -1;
 156         }
 157
 158 #ifdef HFS_QUOTACTL_WAR
 159                 unbecome_root();
 160 #endif  /* HFS_QUOTACTL_WAR */
 161
 162         return 0;
 163 }
 164
 165 int sys_get_vfs_quota(const char *path, const char *bdev,
 166         enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dp)
 167 {
 168         int ret;
 169         struct dqblk qblk;
 170
 171         ZERO_STRUCT(qblk);
 172
 173         switch (qtype) {
 174         case SMB_USER_QUOTA_TYPE:
 175                 /* Get quota for provided UID. */
 176                 ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, USRQUOTA),
 177                                         id.uid, &qblk);
 178                 break;
 179         case SMB_USER_FS_QUOTA_TYPE:
 180                 /* Get quota for current UID. */
 181                 ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, USRQUOTA),
 182                                         geteuid(), &qblk);
 183                 break;
 184         case SMB_GROUP_QUOTA_TYPE:
 185                 /* Get quota for provided GID. */
 186                 ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, GRPQUOTA),
 187                                         id.gid, &qblk);
 188                 break;
 189         case SMB_GROUP_FS_QUOTA_TYPE:
 190                 /* Get quota for current GID. */
 191                 ret = sys_quotactl_4B(path, QCMD(Q_GETQUOTA, GRPQUOTA),
 192                                         getegid(), &qblk);
 193                 break;
 194         default:
 195                 DEBUG(0, ("cannot get unsupported quota type: %u\n",
 196                             (unsigned)qtype));
 197                 errno = ENOSYS;
 198                 return -1;
 199         }
 200
 201         if (ret == -1) {
 202                 return -1;
 203         }
 204
 205         xlate_qblk_to_smb(&qblk, dp);
 206         dp->qtype = qtype;
 207
 208         return ret;
 209 }
 210
 211 int sys_set_vfs_quota(const char *path, const char *bdev,
 212         enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dp)
 213 {
 214         struct dqblk qblk;
 215
 216         xlate_smb_to_qblk(dp, &qblk);
 217
 218         switch (qtype) {
 219         case SMB_USER_QUOTA_TYPE:
 220                 /* Set quota for provided UID. */
 221                 return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, USRQUOTA),
 222                                         id.uid, &qblk);
 223         case SMB_USER_FS_QUOTA_TYPE:
 224                 /* Set quota for current UID. */
 225                 return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, USRQUOTA),
 226                                         geteuid(), &qblk);
 227         case SMB_GROUP_QUOTA_TYPE:
 228                 /* Set quota for provided GID. */
 229                 return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, GRPQUOTA),
 230                                         id.gid, &qblk);
 231         case SMB_GROUP_FS_QUOTA_TYPE:
 232                 /* Set quota for current GID. */
 233                 return sys_quotactl_4B(path, QCMD(Q_SETQUOTA, GRPQUOTA),
 234                                         getegid(), &qblk);
 235         default:
 236                 DEBUG(0, ("cannot set unsupported quota type: %u\n",
 237                             (unsigned)qtype));
 238                 errno = ENOSYS;
 239                 return -1;
 240         }
 241 }
 242
 243 #endif /* HAVE_QUOTACTL_4B */