1 /* -*- buffer-read-only: t -*- vi: set ro:
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 only,
5 * as published by the Free Software Foundation.
7 * Lustre is distributed in the hope that it will be useful, but
8 * WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10 * See the GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License along
13 * with this program. If not, see <http://www.gnu.org/licenses/>.
16 * \file lustre_dlm_flags.h
17 * The flags and collections of flags (masks) for \see struct ldlm_lock.
19 * \addtogroup LDLM Lustre Distributed Lock Manager
23 * The flags and collections of flags (masks) for \see struct ldlm_lock.
26 #ifndef LDLM_ALL_FLAGS_MASK
28 /** l_flags bits marked as "all_flags" bits */
29 #define LDLM_FL_ALL_FLAGS_MASK 0x00FFFFFFC08F932FULL
31 /** extent, mode, or resource changed */
32 #define LDLM_FL_LOCK_CHANGED 0x0000000000000001ULL /* bit 0 */
33 #define ldlm_is_lock_changed(_l) LDLM_TEST_FLAG((_l), 1ULL << 0)
34 #define ldlm_set_lock_changed(_l) LDLM_SET_FLAG((_l), 1ULL << 0)
35 #define ldlm_clear_lock_changed(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 0)
38 * Server placed lock on granted list, or a recovering client wants the
39 * lock added to the granted list, no questions asked.
41 #define LDLM_FL_BLOCK_GRANTED 0x0000000000000002ULL /* bit 1 */
42 #define ldlm_is_block_granted(_l) LDLM_TEST_FLAG((_l), 1ULL << 1)
43 #define ldlm_set_block_granted(_l) LDLM_SET_FLAG((_l), 1ULL << 1)
44 #define ldlm_clear_block_granted(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 1)
47 * Server placed lock on conv list, or a recovering client wants the lock
48 * added to the conv list, no questions asked.
50 #define LDLM_FL_BLOCK_CONV 0x0000000000000004ULL /* bit 2 */
51 #define ldlm_is_block_conv(_l) LDLM_TEST_FLAG((_l), 1ULL << 2)
52 #define ldlm_set_block_conv(_l) LDLM_SET_FLAG((_l), 1ULL << 2)
53 #define ldlm_clear_block_conv(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 2)
56 * Server placed lock on wait list, or a recovering client wants the lock
57 * added to the wait list, no questions asked.
59 #define LDLM_FL_BLOCK_WAIT 0x0000000000000008ULL /* bit 3 */
60 #define ldlm_is_block_wait(_l) LDLM_TEST_FLAG((_l), 1ULL << 3)
61 #define ldlm_set_block_wait(_l) LDLM_SET_FLAG((_l), 1ULL << 3)
62 #define ldlm_clear_block_wait(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 3)
64 /** blocking or cancel packet was queued for sending. */
65 #define LDLM_FL_AST_SENT 0x0000000000000020ULL /* bit 5 */
66 #define ldlm_is_ast_sent(_l) LDLM_TEST_FLAG((_l), 1ULL << 5)
67 #define ldlm_set_ast_sent(_l) LDLM_SET_FLAG((_l), 1ULL << 5)
68 #define ldlm_clear_ast_sent(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 5)
71 * Lock is being replayed. This could probably be implied by the fact that
72 * one of BLOCK_{GRANTED,CONV,WAIT} is set, but that is pretty dangerous.
74 #define LDLM_FL_REPLAY 0x0000000000000100ULL /* bit 8 */
75 #define ldlm_is_replay(_l) LDLM_TEST_FLAG((_l), 1ULL << 8)
76 #define ldlm_set_replay(_l) LDLM_SET_FLAG((_l), 1ULL << 8)
77 #define ldlm_clear_replay(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 8)
79 /** Don't grant lock, just do intent. */
80 #define LDLM_FL_INTENT_ONLY 0x0000000000000200ULL /* bit 9 */
81 #define ldlm_is_intent_only(_l) LDLM_TEST_FLAG((_l), 1ULL << 9)
82 #define ldlm_set_intent_only(_l) LDLM_SET_FLAG((_l), 1ULL << 9)
83 #define ldlm_clear_intent_only(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 9)
85 /** lock request has intent */
86 #define LDLM_FL_HAS_INTENT 0x0000000000001000ULL /* bit 12 */
87 #define ldlm_is_has_intent(_l) LDLM_TEST_FLAG((_l), 1ULL << 12)
88 #define ldlm_set_has_intent(_l) LDLM_SET_FLAG((_l), 1ULL << 12)
89 #define ldlm_clear_has_intent(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 12)
91 /** flock deadlock detected */
92 #define LDLM_FL_FLOCK_DEADLOCK 0x0000000000008000ULL /* bit 15 */
93 #define ldlm_is_flock_deadlock(_l) LDLM_TEST_FLAG((_l), 1ULL << 15)
94 #define ldlm_set_flock_deadlock(_l) LDLM_SET_FLAG((_l), 1ULL << 15)
95 #define ldlm_clear_flock_deadlock(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 15)
97 /** discard (no writeback) on cancel */
98 #define LDLM_FL_DISCARD_DATA 0x0000000000010000ULL /* bit 16 */
99 #define ldlm_is_discard_data(_l) LDLM_TEST_FLAG((_l), 1ULL << 16)
100 #define ldlm_set_discard_data(_l) LDLM_SET_FLAG((_l), 1ULL << 16)
101 #define ldlm_clear_discard_data(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 16)
103 /** Blocked by group lock - wait indefinitely */
104 #define LDLM_FL_NO_TIMEOUT 0x0000000000020000ULL /* bit 17 */
105 #define ldlm_is_no_timeout(_l) LDLM_TEST_FLAG((_l), 1ULL << 17)
106 #define ldlm_set_no_timeout(_l) LDLM_SET_FLAG((_l), 1ULL << 17)
107 #define ldlm_clear_no_timeout(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 17)
110 * Server told not to wait if blocked. For AGL, OST will not send glimpse
113 #define LDLM_FL_BLOCK_NOWAIT 0x0000000000040000ULL /* bit 18 */
114 #define ldlm_is_block_nowait(_l) LDLM_TEST_FLAG((_l), 1ULL << 18)
115 #define ldlm_set_block_nowait(_l) LDLM_SET_FLAG((_l), 1ULL << 18)
116 #define ldlm_clear_block_nowait(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 18)
118 /** return blocking lock */
119 #define LDLM_FL_TEST_LOCK 0x0000000000080000ULL /* bit 19 */
120 #define ldlm_is_test_lock(_l) LDLM_TEST_FLAG((_l), 1ULL << 19)
121 #define ldlm_set_test_lock(_l) LDLM_SET_FLAG((_l), 1ULL << 19)
122 #define ldlm_clear_test_lock(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 19)
125 * Immediately cancel such locks when they block some other locks. Send
126 * cancel notification to original lock holder, but expect no reply. This
127 * is for clients (like liblustre) that cannot be expected to reliably
128 * response to blocking AST.
130 #define LDLM_FL_CANCEL_ON_BLOCK 0x0000000000800000ULL /* bit 23 */
131 #define ldlm_is_cancel_on_block(_l) LDLM_TEST_FLAG((_l), 1ULL << 23)
132 #define ldlm_set_cancel_on_block(_l) LDLM_SET_FLAG((_l), 1ULL << 23)
133 #define ldlm_clear_cancel_on_block(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 23)
136 * measure lock contention and return -EUSERS if locking contention is high */
137 #define LDLM_FL_DENY_ON_CONTENTION 0x0000000040000000ULL /* bit 30 */
138 #define ldlm_is_deny_on_contention(_l) LDLM_TEST_FLAG((_l), 1ULL << 30)
139 #define ldlm_set_deny_on_contention(_l) LDLM_SET_FLAG((_l), 1ULL << 30)
140 #define ldlm_clear_deny_on_contention(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 30)
143 * These are flags that are mapped into the flags and ASTs of blocking
144 * locks Add FL_DISCARD to blocking ASTs */
145 #define LDLM_FL_AST_DISCARD_DATA 0x0000000080000000ULL /* bit 31 */
146 #define ldlm_is_ast_discard_data(_l) LDLM_TEST_FLAG((_l), 1ULL << 31)
147 #define ldlm_set_ast_discard_data(_l) LDLM_SET_FLAG((_l), 1ULL << 31)
148 #define ldlm_clear_ast_discard_data(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 31)
151 * Used for marking lock as a target for -EINTR while cp_ast sleep emulation
152 * + race with upcoming bl_ast.
154 #define LDLM_FL_FAIL_LOC 0x0000000100000000ULL /* bit 32 */
155 #define ldlm_is_fail_loc(_l) LDLM_TEST_FLAG((_l), 1ULL << 32)
156 #define ldlm_set_fail_loc(_l) LDLM_SET_FLAG((_l), 1ULL << 32)
157 #define ldlm_clear_fail_loc(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 32)
160 * Used while processing the unused list to know that we have already
161 * handled this lock and decided to skip it.
163 #define LDLM_FL_SKIPPED 0x0000000200000000ULL /* bit 33 */
164 #define ldlm_is_skipped(_l) LDLM_TEST_FLAG((_l), 1ULL << 33)
165 #define ldlm_set_skipped(_l) LDLM_SET_FLAG((_l), 1ULL << 33)
166 #define ldlm_clear_skipped(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 33)
168 /** this lock is being destroyed */
169 #define LDLM_FL_CBPENDING 0x0000000400000000ULL /* bit 34 */
170 #define ldlm_is_cbpending(_l) LDLM_TEST_FLAG((_l), 1ULL << 34)
171 #define ldlm_set_cbpending(_l) LDLM_SET_FLAG((_l), 1ULL << 34)
172 #define ldlm_clear_cbpending(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 34)
174 /** not a real flag, not saved in lock */
175 #define LDLM_FL_WAIT_NOREPROC 0x0000000800000000ULL /* bit 35 */
176 #define ldlm_is_wait_noreproc(_l) LDLM_TEST_FLAG((_l), 1ULL << 35)
177 #define ldlm_set_wait_noreproc(_l) LDLM_SET_FLAG((_l), 1ULL << 35)
178 #define ldlm_clear_wait_noreproc(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 35)
180 /** cancellation callback already run */
181 #define LDLM_FL_CANCEL 0x0000001000000000ULL /* bit 36 */
182 #define ldlm_is_cancel(_l) LDLM_TEST_FLAG((_l), 1ULL << 36)
183 #define ldlm_set_cancel(_l) LDLM_SET_FLAG((_l), 1ULL << 36)
184 #define ldlm_clear_cancel(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 36)
186 /** whatever it might mean -- never transmitted? */
187 #define LDLM_FL_LOCAL_ONLY 0x0000002000000000ULL /* bit 37 */
188 #define ldlm_is_local_only(_l) LDLM_TEST_FLAG((_l), 1ULL << 37)
189 #define ldlm_set_local_only(_l) LDLM_SET_FLAG((_l), 1ULL << 37)
190 #define ldlm_clear_local_only(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 37)
192 /** don't run the cancel callback under ldlm_cli_cancel_unused */
193 #define LDLM_FL_FAILED 0x0000004000000000ULL /* bit 38 */
194 #define ldlm_is_failed(_l) LDLM_TEST_FLAG((_l), 1ULL << 38)
195 #define ldlm_set_failed(_l) LDLM_SET_FLAG((_l), 1ULL << 38)
196 #define ldlm_clear_failed(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 38)
198 /** lock cancel has already been sent */
199 #define LDLM_FL_CANCELING 0x0000008000000000ULL /* bit 39 */
200 #define ldlm_is_canceling(_l) LDLM_TEST_FLAG((_l), 1ULL << 39)
201 #define ldlm_set_canceling(_l) LDLM_SET_FLAG((_l), 1ULL << 39)
202 #define ldlm_clear_canceling(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 39)
204 /** local lock (ie, no srv/cli split) */
205 #define LDLM_FL_LOCAL 0x0000010000000000ULL /* bit 40 */
206 #define ldlm_is_local(_l) LDLM_TEST_FLAG((_l), 1ULL << 40)
207 #define ldlm_set_local(_l) LDLM_SET_FLAG((_l), 1ULL << 40)
208 #define ldlm_clear_local(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 40)
211 * XXX FIXME: This is being added to b_size as a low-risk fix to the
212 * fact that the LVB filling happens _after_ the lock has been granted,
213 * so another thread can match it before the LVB has been updated. As a
214 * dirty hack, we set LDLM_FL_LVB_READY only after we've done the LVB poop.
215 * this is only needed on LOV/OSC now, where LVB is actually used and
216 * callers must set it in input flags.
218 * The proper fix is to do the granting inside of the completion AST,
219 * which can be replaced with a LVB-aware wrapping function for OSC locks.
220 * That change is pretty high-risk, though, and would need a lot more
223 #define LDLM_FL_LVB_READY 0x0000020000000000ULL /* bit 41 */
224 #define ldlm_is_lvb_ready(_l) LDLM_TEST_FLAG((_l), 1ULL << 41)
225 #define ldlm_set_lvb_ready(_l) LDLM_SET_FLAG((_l), 1ULL << 41)
226 #define ldlm_clear_lvb_ready(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 41)
229 * A lock contributes to the known minimum size (KMS) calculation until it
230 * has finished the part of its cancellation that performs write back on its
231 * dirty pages. It can remain on the granted list during this whole time.
232 * Threads racing to update the KMS after performing their writeback need
233 * to know to exclude each other's locks from the calculation as they walk
236 #define LDLM_FL_KMS_IGNORE 0x0000040000000000ULL /* bit 42 */
237 #define ldlm_is_kms_ignore(_l) LDLM_TEST_FLAG((_l), 1ULL << 42)
238 #define ldlm_set_kms_ignore(_l) LDLM_SET_FLAG((_l), 1ULL << 42)
239 #define ldlm_clear_kms_ignore(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 42)
241 /** completion AST to be executed */
242 #define LDLM_FL_CP_REQD 0x0000080000000000ULL /* bit 43 */
243 #define ldlm_is_cp_reqd(_l) LDLM_TEST_FLAG((_l), 1ULL << 43)
244 #define ldlm_set_cp_reqd(_l) LDLM_SET_FLAG((_l), 1ULL << 43)
245 #define ldlm_clear_cp_reqd(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 43)
247 /** cleanup_resource has already handled the lock */
248 #define LDLM_FL_CLEANED 0x0000100000000000ULL /* bit 44 */
249 #define ldlm_is_cleaned(_l) LDLM_TEST_FLAG((_l), 1ULL << 44)
250 #define ldlm_set_cleaned(_l) LDLM_SET_FLAG((_l), 1ULL << 44)
251 #define ldlm_clear_cleaned(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 44)
254 * optimization hint: LDLM can run blocking callback from current context
255 * w/o involving separate thread. in order to decrease cs rate
257 #define LDLM_FL_ATOMIC_CB 0x0000200000000000ULL /* bit 45 */
258 #define ldlm_is_atomic_cb(_l) LDLM_TEST_FLAG((_l), 1ULL << 45)
259 #define ldlm_set_atomic_cb(_l) LDLM_SET_FLAG((_l), 1ULL << 45)
260 #define ldlm_clear_atomic_cb(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 45)
263 * It may happen that a client initiates two operations, e.g. unlink and
264 * mkdir, such that the server sends a blocking AST for conflicting locks
265 * to this client for the first operation, whereas the second operation
266 * has canceled this lock and is waiting for rpc_lock which is taken by
267 * the first operation. LDLM_FL_BL_AST is set by ldlm_callback_handler() in
268 * the lock to prevent the Early Lock Cancel (ELC) code from cancelling it.
270 #define LDLM_FL_BL_AST 0x0000400000000000ULL /* bit 46 */
271 #define ldlm_is_bl_ast(_l) LDLM_TEST_FLAG((_l), 1ULL << 46)
272 #define ldlm_set_bl_ast(_l) LDLM_SET_FLAG((_l), 1ULL << 46)
273 #define ldlm_clear_bl_ast(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 46)
276 * Set by ldlm_cancel_callback() when lock cache is dropped to let
277 * ldlm_callback_handler() return EINVAL to the server. It is used when
278 * ELC RPC is already prepared and is waiting for rpc_lock, too late to
279 * send a separate CANCEL RPC.
281 #define LDLM_FL_BL_DONE 0x0000800000000000ULL /* bit 47 */
282 #define ldlm_is_bl_done(_l) LDLM_TEST_FLAG((_l), 1ULL << 47)
283 #define ldlm_set_bl_done(_l) LDLM_SET_FLAG((_l), 1ULL << 47)
284 #define ldlm_clear_bl_done(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 47)
287 * Don't put lock into the LRU list, so that it is not canceled due
288 * to aging. Used by MGC locks, they are cancelled only at unmount or
291 #define LDLM_FL_NO_LRU 0x0001000000000000ULL /* bit 48 */
292 #define ldlm_is_no_lru(_l) LDLM_TEST_FLAG((_l), 1ULL << 48)
293 #define ldlm_set_no_lru(_l) LDLM_SET_FLAG((_l), 1ULL << 48)
294 #define ldlm_clear_no_lru(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 48)
297 * Set for locks that failed and where the server has been notified.
299 * Protected by lock and resource locks.
301 #define LDLM_FL_FAIL_NOTIFIED 0x0002000000000000ULL /* bit 49 */
302 #define ldlm_is_fail_notified(_l) LDLM_TEST_FLAG((_l), 1ULL << 49)
303 #define ldlm_set_fail_notified(_l) LDLM_SET_FLAG((_l), 1ULL << 49)
304 #define ldlm_clear_fail_notified(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 49)
307 * Set for locks that were removed from class hash table and will
308 * be destroyed when last reference to them is released. Set by
309 * ldlm_lock_destroy_internal().
311 * Protected by lock and resource locks.
313 #define LDLM_FL_DESTROYED 0x0004000000000000ULL /* bit 50 */
314 #define ldlm_is_destroyed(_l) LDLM_TEST_FLAG((_l), 1ULL << 50)
315 #define ldlm_set_destroyed(_l) LDLM_SET_FLAG((_l), 1ULL << 50)
316 #define ldlm_clear_destroyed(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 50)
318 /** flag whether this is a server namespace lock */
319 #define LDLM_FL_SERVER_LOCK 0x0008000000000000ULL /* bit 51 */
320 #define ldlm_is_server_lock(_l) LDLM_TEST_FLAG((_l), 1ULL << 51)
321 #define ldlm_set_server_lock(_l) LDLM_SET_FLAG((_l), 1ULL << 51)
322 #define ldlm_clear_server_lock(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 51)
325 * It's set in lock_res_and_lock() and unset in unlock_res_and_lock().
327 * NB: compared with check_res_locked(), checking this bit is cheaper.
328 * Also, spin_is_locked() is deprecated for kernel code; one reason is
329 * because it works only for SMP so user needs to add extra macros like
330 * LASSERT_SPIN_LOCKED for uniprocessor kernels.
332 #define LDLM_FL_RES_LOCKED 0x0010000000000000ULL /* bit 52 */
333 #define ldlm_is_res_locked(_l) LDLM_TEST_FLAG((_l), 1ULL << 52)
334 #define ldlm_set_res_locked(_l) LDLM_SET_FLAG((_l), 1ULL << 52)
335 #define ldlm_clear_res_locked(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 52)
338 * It's set once we call ldlm_add_waiting_lock_res_locked() to start the
339 * lock-timeout timer and it will never be reset.
341 * Protected by lock and resource locks.
343 #define LDLM_FL_WAITED 0x0020000000000000ULL /* bit 53 */
344 #define ldlm_is_waited(_l) LDLM_TEST_FLAG((_l), 1ULL << 53)
345 #define ldlm_set_waited(_l) LDLM_SET_FLAG((_l), 1ULL << 53)
346 #define ldlm_clear_waited(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 53)
348 /** Flag whether this is a server namespace lock. */
349 #define LDLM_FL_NS_SRV 0x0040000000000000ULL /* bit 54 */
350 #define ldlm_is_ns_srv(_l) LDLM_TEST_FLAG((_l), 1ULL << 54)
351 #define ldlm_set_ns_srv(_l) LDLM_SET_FLAG((_l), 1ULL << 54)
352 #define ldlm_clear_ns_srv(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 54)
354 /** Flag whether this lock can be reused. Used by exclusive open. */
355 #define LDLM_FL_EXCL 0x0080000000000000ULL /* bit 55 */
356 #define ldlm_is_excl(_l) LDLM_TEST_FLAG((_l), 1ULL << 55)
357 #define ldlm_set_excl(_l) LDLM_SET_FLAG((_l), 1ULL << 55)
358 #define ldlm_clear_excl(_l) LDLM_CLEAR_FLAG((_l), 1ULL << 55)
360 /** l_flags bits marked as "ast" bits */
361 #define LDLM_FL_AST_MASK (LDLM_FL_FLOCK_DEADLOCK |\
362 LDLM_FL_AST_DISCARD_DATA)
364 /** l_flags bits marked as "blocked" bits */
365 #define LDLM_FL_BLOCKED_MASK (LDLM_FL_BLOCK_GRANTED |\
366 LDLM_FL_BLOCK_CONV |\
369 /** l_flags bits marked as "gone" bits */
370 #define LDLM_FL_GONE_MASK (LDLM_FL_DESTROYED |\
373 /** l_flags bits marked as "inherit" bits */
374 /* Flags inherited from wire on enqueue/reply between client/server. */
375 /* NO_TIMEOUT flag to force ldlm_lock_match() to wait with no timeout. */
376 /* TEST_LOCK flag to not let TEST lock to be granted. */
377 #define LDLM_FL_INHERIT_MASK (LDLM_FL_CANCEL_ON_BLOCK |\
378 LDLM_FL_NO_TIMEOUT |\
381 /** test for ldlm_lock flag bit set */
382 #define LDLM_TEST_FLAG(_l, _b) (((_l)->l_flags & (_b)) != 0)
384 /** multi-bit test: are any of mask bits set? */
385 #define LDLM_HAVE_MASK(_l, _m) ((_l)->l_flags & LDLM_FL_##_m##_MASK)
387 /** set a ldlm_lock flag bit */
388 #define LDLM_SET_FLAG(_l, _b) ((_l)->l_flags |= (_b))
390 /** clear a ldlm_lock flag bit */
391 #define LDLM_CLEAR_FLAG(_l, _b) ((_l)->l_flags &= ~(_b))
396 #endif /* LDLM_ALL_FLAGS_MASK */