Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : Copyright (C) Andrew Tridgell 2004
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 : /*
21 : this is the open files database. It implements shared storage of
22 : what files are open between server instances, and implements the rules
23 : of shared access to files.
24 :
25 : The caller needs to provide a file_key, which specifies what file
26 : they are talking about. This needs to be a unique key across all
27 : filesystems, and is usually implemented in terms of a device/inode
28 : pair.
29 :
30 : Before any operations can be performed the caller needs to establish
31 : a lock on the record associated with file_key. That is done by
32 : calling odb_lock(). The caller releases this lock by calling
33 : talloc_free() on the returned handle.
34 :
35 : All other operations on a record are done by passing the odb_lock()
36 : handle back to this module. The handle contains internal
37 : information about what file_key is being operated on.
38 : */
39 :
40 : #include "includes.h"
41 : #include "ntvfs/ntvfs.h"
42 : #include "ntvfs/common/ntvfs_common.h"
43 : #include "cluster/cluster.h"
44 : #include "param/param.h"
45 :
46 : static const struct opendb_ops *ops;
47 :
48 : /*
49 : set the odb backend ops
50 : */
51 4 : void odb_set_ops(const struct opendb_ops *new_ops)
52 : {
53 4 : ops = new_ops;
54 4 : }
55 :
56 : /*
57 : Open up the openfiles.tdb database. Close it down using
58 : talloc_free(). We need the imessaging_ctx to allow for pending open
59 : notifications.
60 : */
61 1328 : struct odb_context *odb_init(TALLOC_CTX *mem_ctx,
62 : struct ntvfs_context *ntvfs_ctx)
63 : {
64 1328 : if (ops == NULL) {
65 4 : odb_tdb_init_ops();
66 : }
67 1328 : return ops->odb_init(mem_ctx, ntvfs_ctx);
68 : }
69 :
70 : /*
71 : get a lock on a entry in the odb. This call returns a lock handle,
72 : which the caller should unlock using talloc_free().
73 : */
74 948629 : struct odb_lock *odb_lock(TALLOC_CTX *mem_ctx,
75 : struct odb_context *odb, DATA_BLOB *file_key)
76 : {
77 948629 : return ops->odb_lock(mem_ctx, odb, file_key);
78 : }
79 :
80 2905 : DATA_BLOB odb_get_key(TALLOC_CTX *mem_ctx, struct odb_lock *lck)
81 : {
82 2905 : return ops->odb_get_key(mem_ctx, lck);
83 : }
84 :
85 : /*
86 : register an open file in the open files database.
87 : The share_access rules are implemented by odb_can_open()
88 : and it's needed to call odb_can_open() before
89 : odb_open_file() otherwise NT_STATUS_INTERNAL_ERROR is returned
90 :
91 : Note that the path is only used by the delete on close logic, not
92 : for comparing with other filenames
93 : */
94 202960 : NTSTATUS odb_open_file(struct odb_lock *lck,
95 : void *file_handle, const char *path,
96 : int *fd, NTTIME open_write_time,
97 : bool allow_level_II_oplock,
98 : uint32_t oplock_level, uint32_t *oplock_granted)
99 : {
100 202960 : return ops->odb_open_file(lck, file_handle, path,
101 : fd, open_write_time,
102 : allow_level_II_oplock,
103 : oplock_level, oplock_granted);
104 : }
105 :
106 :
107 : /*
108 : register a pending open file in the open files database
109 : */
110 2905 : NTSTATUS odb_open_file_pending(struct odb_lock *lck, void *private_data)
111 : {
112 2905 : return ops->odb_open_file_pending(lck, private_data);
113 : }
114 :
115 :
116 : /*
117 : remove a opendb entry
118 : */
119 202960 : NTSTATUS odb_close_file(struct odb_lock *lck, void *file_handle,
120 : const char **delete_path)
121 : {
122 202960 : return ops->odb_close_file(lck, file_handle, delete_path);
123 : }
124 :
125 :
126 : /*
127 : remove a pending opendb entry
128 : */
129 2821 : NTSTATUS odb_remove_pending(struct odb_lock *lck, void *private_data)
130 : {
131 2821 : return ops->odb_remove_pending(lck, private_data);
132 : }
133 :
134 :
135 : /*
136 : rename the path in a open file
137 : */
138 112 : NTSTATUS odb_rename(struct odb_lock *lck, const char *path)
139 : {
140 112 : return ops->odb_rename(lck, path);
141 : }
142 :
143 : /*
144 : get back the path of an open file
145 : */
146 8392 : NTSTATUS odb_get_path(struct odb_lock *lck, const char **path)
147 : {
148 8392 : return ops->odb_get_path(lck, path);
149 : }
150 :
151 : /*
152 : update delete on close flag on an open file
153 : */
154 317 : NTSTATUS odb_set_delete_on_close(struct odb_lock *lck, bool del_on_close)
155 : {
156 317 : return ops->odb_set_delete_on_close(lck, del_on_close);
157 : }
158 :
159 : /*
160 : update the write time on an open file
161 : */
162 9645 : NTSTATUS odb_set_write_time(struct odb_lock *lck,
163 : NTTIME write_time, bool force)
164 : {
165 9645 : return ops->odb_set_write_time(lck, write_time, force);
166 : }
167 :
168 : /*
169 : return the current value of the delete_on_close bit,
170 : and the current write time.
171 : */
172 459871 : NTSTATUS odb_get_file_infos(struct odb_context *odb, DATA_BLOB *key,
173 : bool *del_on_close, NTTIME *write_time)
174 : {
175 459871 : return ops->odb_get_file_infos(odb, key, del_on_close, write_time);
176 : }
177 :
178 : /*
179 : determine if a file can be opened with the given share_access,
180 : create_options and access_mask
181 : */
182 242201 : NTSTATUS odb_can_open(struct odb_lock *lck,
183 : uint32_t stream_id, uint32_t share_access,
184 : uint32_t access_mask, bool delete_on_close,
185 : uint32_t open_disposition, bool break_to_none)
186 : {
187 242201 : return ops->odb_can_open(lck, stream_id, share_access, access_mask,
188 : delete_on_close, open_disposition, break_to_none);
189 : }
190 :
191 86 : NTSTATUS odb_update_oplock(struct odb_lock *lck, void *file_handle,
192 : uint32_t oplock_level)
193 : {
194 86 : return ops->odb_update_oplock(lck, file_handle, oplock_level);
195 : }
196 :
197 31565 : NTSTATUS odb_break_oplocks(struct odb_lock *lck)
198 : {
199 31565 : return ops->odb_break_oplocks(lck);
200 : }
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