Fix bug #7067 - Linux asynchronous IO (aio) can cause smbd to fail to respond to...
[amitay/samba.git] / source3 / smbd / ntquotas.c
1 /* 
2    Unix SMB/CIFS implementation.
3    NT QUOTA suppport
4    Copyright (C) Stefan (metze) Metzmacher      2003
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
22 #undef DBGC_CLASS
23 #define DBGC_CLASS DBGC_QUOTA
24
25 static uint64_t limit_nt2unix(uint64_t in, uint64_t bsize)
26 {
27         uint64_t ret = (uint64_t)0;
28
29         ret =   (uint64_t)(in/bsize);
30         if (in>0 && ret==0) {
31                 /* we have to make sure that a overflow didn't set NO_LIMIT */
32                 ret = (uint64_t)1;
33         }
34
35         if (in == SMB_NTQUOTAS_NO_LIMIT)
36                 ret = SMB_QUOTAS_NO_LIMIT;
37         else if (in == SMB_NTQUOTAS_NO_SPACE)
38                 ret = SMB_QUOTAS_NO_SPACE;
39         else if (in == SMB_NTQUOTAS_NO_ENTRY)
40                 ret = SMB_QUOTAS_NO_LIMIT;
41
42         return ret;
43 }
44
45 static uint64_t limit_unix2nt(uint64_t in, uint64_t bsize)
46 {
47         uint64_t ret = (uint64_t)0;
48
49         ret = (uint64_t)(in*bsize);
50         
51         if (ret < in) {
52                 /* we overflow */
53                 ret = SMB_NTQUOTAS_NO_LIMIT;
54         }
55
56         if (in == SMB_QUOTAS_NO_LIMIT)
57                 ret = SMB_NTQUOTAS_NO_LIMIT;
58
59         return ret;
60 }
61
62 static uint64_t limit_blk2inodes(uint64_t in)
63 {
64         uint64_t ret = (uint64_t)0;
65         
66         ret = (uint64_t)(in/2);
67         
68         if (ret == 0 && in != 0)
69                 ret = (uint64_t)1;
70
71         return ret;     
72 }
73
74 int vfs_get_ntquota(files_struct *fsp, enum SMB_QUOTA_TYPE qtype, DOM_SID *psid, SMB_NTQUOTA_STRUCT *qt)
75 {
76         int ret;
77         SMB_DISK_QUOTA D;
78         unid_t id;
79
80         ZERO_STRUCT(D);
81
82         if (!fsp||!fsp->conn||!qt)
83                 return (-1);
84
85         ZERO_STRUCT(*qt);
86
87         id.uid = -1;
88
89         if (psid && !sid_to_uid(psid, &id.uid)) {
90                 DEBUG(0,("sid_to_uid: failed, SID[%s]\n",
91                          sid_string_dbg(psid)));
92         }
93
94         ret = SMB_VFS_GET_QUOTA(fsp->conn, qtype, id, &D);
95
96         if (psid)
97                 qt->sid    = *psid;
98
99         if (ret!=0) {
100                 return ret;
101         }
102                 
103         qt->usedspace = (uint64_t)D.curblocks*D.bsize;
104         qt->softlim = limit_unix2nt(D.softlimit, D.bsize);
105         qt->hardlim = limit_unix2nt(D.hardlimit, D.bsize);
106         qt->qflags = D.qflags;
107
108         
109         return 0;
110 }
111
112 int vfs_set_ntquota(files_struct *fsp, enum SMB_QUOTA_TYPE qtype, DOM_SID *psid, SMB_NTQUOTA_STRUCT *qt)
113 {
114         int ret;
115         SMB_DISK_QUOTA D;
116         unid_t id;
117         ZERO_STRUCT(D);
118
119         if (!fsp||!fsp->conn||!qt)
120                 return (-1);
121
122         id.uid = -1;
123
124         D.bsize     = (uint64_t)QUOTABLOCK_SIZE;
125
126         D.softlimit = limit_nt2unix(qt->softlim,D.bsize);
127         D.hardlimit = limit_nt2unix(qt->hardlim,D.bsize);
128         D.qflags     = qt->qflags;
129
130         D.isoftlimit = limit_blk2inodes(D.softlimit);
131         D.ihardlimit = limit_blk2inodes(D.hardlimit);
132
133         if (psid && !sid_to_uid(psid, &id.uid)) {
134                 DEBUG(0,("sid_to_uid: failed, SID[%s]\n",
135                          sid_string_dbg(psid)));
136         }
137
138         ret = SMB_VFS_SET_QUOTA(fsp->conn, qtype, id, &D);
139         
140         return ret;
141 }
142
143 static bool allready_in_quota_list(SMB_NTQUOTA_LIST *qt_list, uid_t uid)
144 {
145         SMB_NTQUOTA_LIST *tmp_list = NULL;
146         
147         if (!qt_list)
148                 return False;
149
150         for (tmp_list=qt_list;tmp_list!=NULL;tmp_list=tmp_list->next) {
151                 if (tmp_list->uid == uid) {
152                         return True;    
153                 }
154         }
155
156         return False;
157 }
158
159 int vfs_get_user_ntquota_list(files_struct *fsp, SMB_NTQUOTA_LIST **qt_list)
160 {
161         struct passwd *usr;
162         TALLOC_CTX *mem_ctx = NULL;
163
164         if (!fsp||!fsp->conn||!qt_list)
165                 return (-1);
166
167         *qt_list = NULL;
168
169         if ((mem_ctx=talloc_init("SMB_USER_QUOTA_LIST"))==NULL) {
170                 DEBUG(0,("talloc_init() failed\n"));
171                 return (-1);
172         }
173
174         sys_setpwent();
175         while ((usr = sys_getpwent()) != NULL) {
176                 SMB_NTQUOTA_STRUCT tmp_qt;
177                 SMB_NTQUOTA_LIST *tmp_list_ent;
178                 DOM_SID sid;
179
180                 ZERO_STRUCT(tmp_qt);
181
182                 if (allready_in_quota_list((*qt_list),usr->pw_uid)) {
183                         DEBUG(5,("record for uid[%ld] allready in the list\n",(long)usr->pw_uid));
184                         continue;
185                 }
186
187                 uid_to_sid(&sid, usr->pw_uid);
188
189                 if (vfs_get_ntquota(fsp, SMB_USER_QUOTA_TYPE, &sid, &tmp_qt)!=0) {
190                         DEBUG(5,("no quota entry for sid[%s] path[%s]\n",
191                                  sid_string_dbg(&sid),
192                                  fsp->conn->connectpath));
193                         continue;
194                 }
195
196                 DEBUG(15,("quota entry for id[%s] path[%s]\n",
197                           sid_string_dbg(&sid), fsp->conn->connectpath));
198
199                 if ((tmp_list_ent=TALLOC_ZERO_P(mem_ctx,SMB_NTQUOTA_LIST))==NULL) {
200                         DEBUG(0,("TALLOC_ZERO() failed\n"));
201                         *qt_list = NULL;
202                         talloc_destroy(mem_ctx);
203                         return (-1);
204                 }
205
206                 if ((tmp_list_ent->quotas=TALLOC_ZERO_P(mem_ctx,SMB_NTQUOTA_STRUCT))==NULL) {
207                         DEBUG(0,("TALLOC_ZERO() failed\n"));
208                         *qt_list = NULL;
209                         talloc_destroy(mem_ctx);
210                         return (-1);
211                 }
212
213                 tmp_list_ent->uid = usr->pw_uid;
214                 memcpy(tmp_list_ent->quotas,&tmp_qt,sizeof(tmp_qt));
215                 tmp_list_ent->mem_ctx = mem_ctx;
216
217                 DLIST_ADD((*qt_list),tmp_list_ent);
218                 
219         }
220         sys_endpwent();
221
222         return 0;
223 }
224
225 static int quota_handle_destructor(SMB_NTQUOTA_HANDLE *handle)
226 {
227         if (handle->quota_list)
228                 free_ntquota_list(&handle->quota_list);
229         return 0;
230 }
231
232 void *init_quota_handle(TALLOC_CTX *mem_ctx)
233 {
234         SMB_NTQUOTA_HANDLE *qt_handle;
235
236         if (!mem_ctx)
237                 return False;
238
239         qt_handle = TALLOC_ZERO_P(mem_ctx,SMB_NTQUOTA_HANDLE);
240         if (qt_handle==NULL) {
241                 DEBUG(0,("TALLOC_ZERO() failed\n"));
242                 return NULL;
243         }
244
245         talloc_set_destructor(qt_handle, quota_handle_destructor);
246         return (void *)qt_handle;
247 }