| 1 | /*
|
|---|
| 2 | Unix SMB/CIFS implementation.
|
|---|
| 3 |
|
|---|
| 4 | generic byte range locking code
|
|---|
| 5 |
|
|---|
| 6 | Copyright (C) Andrew Tridgell 1992-2004
|
|---|
| 7 | Copyright (C) Jeremy Allison 1992-2000
|
|---|
| 8 |
|
|---|
| 9 | This program is free software; you can redistribute it and/or modify
|
|---|
| 10 | it under the terms of the GNU General Public License as published by
|
|---|
| 11 | the Free Software Foundation; either version 3 of the License, or
|
|---|
| 12 | (at your option) any later version.
|
|---|
| 13 |
|
|---|
| 14 | This program is distributed in the hope that it will be useful,
|
|---|
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 17 | GNU General Public License for more details.
|
|---|
| 18 |
|
|---|
| 19 | You should have received a copy of the GNU General Public License
|
|---|
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|---|
| 21 | */
|
|---|
| 22 |
|
|---|
| 23 | /* This module implements a tdb based byte range locking service,
|
|---|
| 24 | replacing the fcntl() based byte range locking previously
|
|---|
| 25 | used. This allows us to provide the same semantics as NT */
|
|---|
| 26 |
|
|---|
| 27 | #include "includes.h"
|
|---|
| 28 | #include "system/filesys.h"
|
|---|
| 29 | #include "../tdb/include/tdb.h"
|
|---|
| 30 | #include "messaging/messaging.h"
|
|---|
| 31 | #include "lib/messaging/irpc.h"
|
|---|
| 32 | #include "libcli/libcli.h"
|
|---|
| 33 | #include "cluster/cluster.h"
|
|---|
| 34 | #include "ntvfs/common/ntvfs_common.h"
|
|---|
| 35 |
|
|---|
| 36 | static const struct brlock_ops *ops;
|
|---|
| 37 |
|
|---|
| 38 | /*
|
|---|
| 39 | set the brl backend ops
|
|---|
| 40 | */
|
|---|
| 41 | void brl_set_ops(const struct brlock_ops *new_ops)
|
|---|
| 42 | {
|
|---|
| 43 | ops = new_ops;
|
|---|
| 44 | }
|
|---|
| 45 |
|
|---|
| 46 | /*
|
|---|
| 47 | Open up the brlock database. Close it down using talloc_free(). We
|
|---|
| 48 | need the messaging_ctx to allow for pending lock notifications.
|
|---|
| 49 | */
|
|---|
| 50 | struct brl_context *brl_init(TALLOC_CTX *mem_ctx, struct server_id server,
|
|---|
| 51 | struct loadparm_context *lp_ctx,
|
|---|
| 52 | struct messaging_context *messaging_ctx)
|
|---|
| 53 | {
|
|---|
| 54 | if (ops == NULL) {
|
|---|
| 55 | brl_tdb_init_ops();
|
|---|
| 56 | }
|
|---|
| 57 | return ops->brl_init(mem_ctx, server, lp_ctx, messaging_ctx);
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | struct brl_handle *brl_create_handle(TALLOC_CTX *mem_ctx, struct ntvfs_handle *ntvfs, DATA_BLOB *file_key)
|
|---|
| 61 | {
|
|---|
| 62 | return ops->brl_create_handle(mem_ctx, ntvfs, file_key);
|
|---|
| 63 | }
|
|---|
| 64 |
|
|---|
| 65 | /*
|
|---|
| 66 | Lock a range of bytes. The lock_type can be a PENDING_*_LOCK, in
|
|---|
| 67 | which case a real lock is first tried, and if that fails then a
|
|---|
| 68 | pending lock is created. When the pending lock is triggered (by
|
|---|
| 69 | someone else closing an overlapping lock range) a messaging
|
|---|
| 70 | notification is sent, identified by the notify_ptr
|
|---|
| 71 | */
|
|---|
| 72 | NTSTATUS brl_lock(struct brl_context *brl,
|
|---|
| 73 | struct brl_handle *brlh,
|
|---|
| 74 | uint32_t smbpid,
|
|---|
| 75 | uint64_t start, uint64_t size,
|
|---|
| 76 | enum brl_type lock_type,
|
|---|
| 77 | void *notify_ptr)
|
|---|
| 78 | {
|
|---|
| 79 | return ops->brl_lock(brl, brlh, smbpid, start, size, lock_type, notify_ptr);
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 |
|
|---|
| 83 | /*
|
|---|
| 84 | Unlock a range of bytes.
|
|---|
| 85 | */
|
|---|
| 86 | NTSTATUS brl_unlock(struct brl_context *brl,
|
|---|
| 87 | struct brl_handle *brlh,
|
|---|
| 88 | uint32_t smbpid,
|
|---|
| 89 | uint64_t start, uint64_t size)
|
|---|
| 90 | {
|
|---|
| 91 | return ops->brl_unlock(brl, brlh, smbpid, start, size);
|
|---|
| 92 | }
|
|---|
| 93 |
|
|---|
| 94 | /*
|
|---|
| 95 | remove a pending lock. This is called when the caller has either
|
|---|
| 96 | given up trying to establish a lock or when they have succeeded in
|
|---|
| 97 | getting it. In either case they no longer need to be notified.
|
|---|
| 98 | */
|
|---|
| 99 | NTSTATUS brl_remove_pending(struct brl_context *brl,
|
|---|
| 100 | struct brl_handle *brlh,
|
|---|
| 101 | void *notify_ptr)
|
|---|
| 102 | {
|
|---|
| 103 | return ops->brl_remove_pending(brl, brlh, notify_ptr);
|
|---|
| 104 | }
|
|---|
| 105 |
|
|---|
| 106 |
|
|---|
| 107 | /*
|
|---|
| 108 | Test if we are allowed to perform IO on a region of an open file
|
|---|
| 109 | */
|
|---|
| 110 | NTSTATUS brl_locktest(struct brl_context *brl,
|
|---|
| 111 | struct brl_handle *brlh,
|
|---|
| 112 | uint32_t smbpid,
|
|---|
| 113 | uint64_t start, uint64_t size,
|
|---|
| 114 | enum brl_type lock_type)
|
|---|
| 115 | {
|
|---|
| 116 | return ops->brl_locktest(brl, brlh, smbpid, start, size, lock_type);
|
|---|
| 117 | }
|
|---|
| 118 |
|
|---|
| 119 |
|
|---|
| 120 | /*
|
|---|
| 121 | Remove any locks associated with a open file.
|
|---|
| 122 | */
|
|---|
| 123 | NTSTATUS brl_close(struct brl_context *brl,
|
|---|
| 124 | struct brl_handle *brlh)
|
|---|
| 125 | {
|
|---|
| 126 | return ops->brl_close(brl, brlh);
|
|---|
| 127 | }
|
|---|
