mask, new_ex->end, req_end);
}
-/* The purpose of this function is to return:
- * - the maximum extent
- * - containing the requested extent
- * - and not overlapping existing conflicting extents outside the requested one
- *
- * Use interval tree to expand the lock extent for granted lock.
- */
-static void ldlm_extent_internal_policy_granted(struct ldlm_lock *req,
- struct ldlm_extent *new_ex)
-{
- struct ldlm_resource *res = req->l_resource;
- ldlm_mode_t req_mode = req->l_req_mode;
- __u64 req_start = req->l_req_extent.start;
- __u64 req_end = req->l_req_extent.end;
- struct ldlm_interval_tree *tree;
- struct interval_node_extent limiter = { new_ex->start, new_ex->end };
- int conflicting = 0;
- int idx;
- ENTRY;
-
- lockmode_verify(req_mode);
-
- /* using interval tree to handle the ldlm extent granted locks */
- for (idx = 0; idx < LCK_MODE_NUM; idx++) {
- struct interval_node_extent ext = { req_start, req_end };
-
- tree = &res->lr_itree[idx];
- if (lockmode_compat(tree->lit_mode, req_mode))
- continue;
-
- conflicting += tree->lit_size;
- if (conflicting > 4)
- limiter.start = req_start;
-
- if (interval_is_overlapped(tree->lit_root, &ext))
- CDEBUG(D_INFO,
- "req_mode = %d, tree->lit_mode = %d, "
- "tree->lit_size = %d\n",
- req_mode, tree->lit_mode, tree->lit_size);
- interval_expand(tree->lit_root, &ext, &limiter);
- limiter.start = max(limiter.start, ext.start);
- limiter.end = min(limiter.end, ext.end);
- if (limiter.start == req_start && limiter.end == req_end)
- break;
- }
-
- new_ex->start = limiter.start;
- new_ex->end = limiter.end;
- LASSERT(new_ex->start <= req_start);
- LASSERT(new_ex->end >= req_end);
-
- ldlm_extent_internal_policy_fixup(req, new_ex, conflicting);
- EXIT;
-}
-
-/* The purpose of this function is to return:
- * - the maximum extent
- * - containing the requested extent
- * - and not overlapping existing conflicting extents outside the requested one
- */
-static void
-ldlm_extent_internal_policy_waiting(struct ldlm_lock *req,
- struct ldlm_extent *new_ex)
-{
- cfs_list_t *tmp;
- struct ldlm_resource *res = req->l_resource;
- ldlm_mode_t req_mode = req->l_req_mode;
- __u64 req_start = req->l_req_extent.start;
- __u64 req_end = req->l_req_extent.end;
- int conflicting = 0;
- ENTRY;
-
- lockmode_verify(req_mode);
-
- /* for waiting locks */
- cfs_list_for_each(tmp, &res->lr_waiting) {
- struct ldlm_lock *lock;
- struct ldlm_extent *l_extent;
-
- lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
- l_extent = &lock->l_policy_data.l_extent;
-
- /* We already hit the minimum requested size, search no more */
- if (new_ex->start == req_start && new_ex->end == req_end) {
- EXIT;
- return;
- }
-
- /* Don't conflict with ourselves */
- if (req == lock)
- continue;
-
- /* Locks are compatible, overlap doesn't matter */
- /* Until bug 20 is fixed, try to avoid granting overlapping
- * locks on one client (they take a long time to cancel) */
- if (lockmode_compat(lock->l_req_mode, req_mode) &&
- lock->l_export != req->l_export)
- continue;
-
- /* If this is a high-traffic lock, don't grow downwards at all
- * or grow upwards too much */
- ++conflicting;
- if (conflicting > 4)
- new_ex->start = req_start;
-
- /* If lock doesn't overlap new_ex, skip it. */
- if (!ldlm_extent_overlap(l_extent, new_ex))
- continue;
-
- /* Locks conflicting in requested extents and we can't satisfy
- * both locks, so ignore it. Either we will ping-pong this
- * extent (we would regardless of what extent we granted) or
- * lock is unused and it shouldn't limit our extent growth. */
- if (ldlm_extent_overlap(&lock->l_req_extent,&req->l_req_extent))
- continue;
-
- /* We grow extents downwards only as far as they don't overlap
- * with already-granted locks, on the assumption that clients
- * will be writing beyond the initial requested end and would
- * then need to enqueue a new lock beyond previous request.
- * l_req_extent->end strictly < req_start, checked above. */
- if (l_extent->start < req_start && new_ex->start != req_start) {
- if (l_extent->end >= req_start)
- new_ex->start = req_start;
- else
- new_ex->start = min(l_extent->end+1, req_start);
- }
-
- /* If we need to cancel this lock anyways because our request
- * overlaps the granted lock, we grow up to its requested
- * extent start instead of limiting this extent, assuming that
- * clients are writing forwards and the lock had over grown
- * its extent downwards before we enqueued our request. */
- if (l_extent->end > req_end) {
- if (l_extent->start <= req_end)
- new_ex->end = max(lock->l_req_extent.start - 1,
- req_end);
- else
- new_ex->end = max(l_extent->start - 1, req_end);
- }
- }
-
- ldlm_extent_internal_policy_fixup(req, new_ex, conflicting);
- EXIT;
-}
-
-
-/* In order to determine the largest possible extent we can grant, we need
- * to scan all of the queues. */
-static void ldlm_extent_policy(struct ldlm_resource *res,
- struct ldlm_lock *lock, int *flags)
-{
- struct ldlm_extent new_ex = { .start = 0, .end = OBD_OBJECT_EOF };
-
- if (lock->l_export == NULL)
- /*
- * this is local lock taken by server (e.g., as a part of
- * OST-side locking, or unlink handling). Expansion doesn't
- * make a lot of sense for local locks, because they are
- * dropped immediately on operation completion and would only
- * conflict with other threads.
- */
- return;
-
- if (lock->l_policy_data.l_extent.start == 0 &&
- lock->l_policy_data.l_extent.end == OBD_OBJECT_EOF)
- /* fast-path whole file locks */
- return;
-
- ldlm_extent_internal_policy_granted(lock, &new_ex);
- ldlm_extent_internal_policy_waiting(lock, &new_ex);
-
- if (new_ex.start != lock->l_policy_data.l_extent.start ||
- new_ex.end != lock->l_policy_data.l_extent.end) {
- *flags |= LDLM_FL_LOCK_CHANGED;
- lock->l_policy_data.l_extent.start = new_ex.start;
- lock->l_policy_data.l_extent.end = new_ex.end;
- }
-}
static int ldlm_check_contention(struct ldlm_lock *lock, int contended_locks)
{
ldlm_mode_t mode;
int *locks;
int *compat;
+ int *conflicts;
};
static enum interval_iter ldlm_extent_compat_cb(struct interval_node *n,
"mode = %s, lock->l_granted_mode = %s\n",
ldlm_lockname[mode],
ldlm_lockname[lock->l_granted_mode]);
- count++;
+
+ /* only count _requested_ region overlapped locks as contended
+ * locks */
+ if (lock->l_req_extent.end >= enq->l_req_extent.start &&
+ lock->l_req_extent.start <= enq->l_req_extent.end) {
+ count++;
+ (*priv->conflicts)++;
+ }
if (lock->l_blocking_ast)
ldlm_add_ast_work_item(lock, enq, work_list);
}
RETURN(INTERVAL_ITER_CONT);
}
-/* Determine if the lock is compatible with all locks on the queue.
- * We stop walking the queue if we hit ourselves so we don't take
- * conflicting locks enqueued after us into accound, or we'd wait forever.
- *
- * 0 if the lock is not compatible
- * 1 if the lock is compatible
- * 2 if this group lock is compatible and requires no further checking
- * negative error, such as EWOULDBLOCK for group locks
- */
static int
-ldlm_extent_compat_queue(cfs_list_t *queue, struct ldlm_lock *req,
- int *flags, ldlm_error_t *err,
- cfs_list_t *work_list, int *contended_locks)
+ldlm_extent_compat_granted_queue(cfs_list_t *queue, struct ldlm_lock *req,
+ int *flags, ldlm_error_t *err,
+ cfs_list_t *work_list, int *contended_locks)
{
- cfs_list_t *tmp;
- struct ldlm_lock *lock;
struct ldlm_resource *res = req->l_resource;
ldlm_mode_t req_mode = req->l_req_mode;
__u64 req_start = req->l_req_extent.start;
__u64 req_end = req->l_req_extent.end;
- int compat = 1;
- int scan = 0;
- int check_contention;
+ int compat = 1, conflicts;
+ /* Using interval tree for granted lock */
+ struct ldlm_interval_tree *tree;
+ struct ldlm_extent_compat_args data = {.work_list = work_list,
+ .lock = req,
+ .locks = contended_locks,
+ .compat = &compat,
+ .conflicts = &conflicts };
+ struct interval_node_extent ex = { .start = req_start,
+ .end = req_end };
+ int idx, rc;
ENTRY;
- lockmode_verify(req_mode);
- /* Using interval tree for granted lock */
- if (queue == &res->lr_granted) {
- struct ldlm_interval_tree *tree;
- struct ldlm_extent_compat_args data = {.work_list = work_list,
- .lock = req,
- .locks = contended_locks,
- .compat = &compat };
- struct interval_node_extent ex = { .start = req_start,
- .end = req_end };
- int idx, rc;
-
- for (idx = 0; idx < LCK_MODE_NUM; idx++) {
- tree = &res->lr_itree[idx];
- if (tree->lit_root == NULL) /* empty tree, skipped */
+ for (idx = 0; idx < LCK_MODE_NUM; idx++) {
+ tree = &res->lr_itree[idx];
+ if (tree->lit_root == NULL) /* empty tree, skipped */
+ continue;
+
+ data.mode = tree->lit_mode;
+ if (lockmode_compat(req_mode, tree->lit_mode)) {
+ struct ldlm_interval *node;
+ struct ldlm_extent *extent;
+
+ if (req_mode != LCK_GROUP)
continue;
- data.mode = tree->lit_mode;
- if (lockmode_compat(req_mode, tree->lit_mode)) {
- struct ldlm_interval *node;
- struct ldlm_extent *extent;
-
- if (req_mode != LCK_GROUP)
- continue;
-
- /* group lock, grant it immediately if
- * compatible */
- node = to_ldlm_interval(tree->lit_root);
- extent = ldlm_interval_extent(node);
- if (req->l_policy_data.l_extent.gid ==
- extent->gid)
- RETURN(2);
+ /* group lock, grant it immediately if
+ * compatible */
+ node = to_ldlm_interval(tree->lit_root);
+ extent = ldlm_interval_extent(node);
+ if (req->l_policy_data.l_extent.gid ==
+ extent->gid)
+ RETURN(2);
+ }
+
+ if (tree->lit_mode == LCK_GROUP) {
+ if (*flags & LDLM_FL_BLOCK_NOWAIT) {
+ compat = -EWOULDBLOCK;
+ goto destroylock;
}
- if (tree->lit_mode == LCK_GROUP) {
- if (*flags & LDLM_FL_BLOCK_NOWAIT) {
- compat = -EWOULDBLOCK;
- goto destroylock;
- }
+ *flags |= LDLM_FL_NO_TIMEOUT;
+ if (!work_list)
+ RETURN(0);
- *flags |= LDLM_FL_NO_TIMEOUT;
- if (!work_list)
- RETURN(0);
+ /* if work list is not NULL,add all
+ locks in the tree to work list */
+ compat = 0;
+ interval_iterate(tree->lit_root,
+ ldlm_extent_compat_cb, &data);
+ continue;
+ }
- /* if work list is not NULL,add all
- locks in the tree to work list */
- compat = 0;
- interval_iterate(tree->lit_root,
- ldlm_extent_compat_cb, &data);
- continue;
- }
- if (!work_list) {
- rc = interval_is_overlapped(tree->lit_root,&ex);
- if (rc)
- RETURN(0);
- } else {
- interval_search(tree->lit_root, &ex,
- ldlm_extent_compat_cb, &data);
- if (!cfs_list_empty(work_list) && compat)
+ if (!work_list) {
+ rc = interval_is_overlapped(tree->lit_root, &ex);
+ if (rc)
+ RETURN(0);
+ } else {
+ struct interval_node_extent result_ext = {
+ .start = req->l_policy_data.l_extent.start,
+ .end = req->l_policy_data.l_extent.end };
+
+ conflicts = 0;
+ interval_search_expand_extent(tree->lit_root, &ex,
+ &result_ext,
+ ldlm_extent_compat_cb,
+ &data);
+ req->l_policy_data.l_extent.start = result_ext.start;
+ req->l_policy_data.l_extent.end = result_ext.end;
+ /* for granted locks, count non-compatible not overlapping
+ * locks in traffic index */
+ req->l_traffic += tree->lit_size - conflicts;
+
+ if (!cfs_list_empty(work_list)) {
+ if (compat)
compat = 0;
+ /* if there is at least 1 conflicting lock, we
+ * do not expand to the left, since we often
+ * continue writing to the right.
+ */
+ req->l_policy_data.l_extent.start = req_start;
}
}
- } else { /* for waiting queue */
- cfs_list_for_each(tmp, queue) {
- check_contention = 1;
+ }
- lock = cfs_list_entry(tmp, struct ldlm_lock,
- l_res_link);
+ RETURN(compat);
+destroylock:
+ cfs_list_del_init(&req->l_res_link);
+ ldlm_lock_destroy_nolock(req);
+ *err = compat;
+ RETURN(compat);
+}
- if (req == lock)
- break;
+static int
+ldlm_extent_compat_waiting_queue(cfs_list_t *queue, struct ldlm_lock *req,
+ int *flags, ldlm_error_t *err,
+ cfs_list_t *work_list, int *contended_locks)
+{
+ cfs_list_t *tmp;
+ struct ldlm_lock *lock;
+ ldlm_mode_t req_mode = req->l_req_mode;
+ __u64 req_start = req->l_req_extent.start;
+ __u64 req_end = req->l_req_extent.end;
+ int compat = 1;
+ int scan = 0;
+ int check_contention;
+ ENTRY;
- if (unlikely(scan)) {
- /* We only get here if we are queuing GROUP lock
- and met some incompatible one. The main idea of this
- code is to insert GROUP lock past compatible GROUP
- lock in the waiting queue or if there is not any,
- then in front of first non-GROUP lock */
- if (lock->l_req_mode != LCK_GROUP) {
- /* Ok, we hit non-GROUP lock, there should
- * be no more GROUP locks later on, queue in
- * front of first non-GROUP lock */
-
- ldlm_resource_insert_lock_after(lock, req);
- cfs_list_del_init(&lock->l_res_link);
- ldlm_resource_insert_lock_after(req, lock);
- compat = 0;
- break;
- }
- if (req->l_policy_data.l_extent.gid ==
- lock->l_policy_data.l_extent.gid) {
- /* found it */
- ldlm_resource_insert_lock_after(lock, req);
- compat = 0;
- break;
- }
- continue;
- }
+ cfs_list_for_each(tmp, queue) {
+ check_contention = 1;
- /* locks are compatible, overlap doesn't matter */
- if (lockmode_compat(lock->l_req_mode, req_mode)) {
- if (req_mode == LCK_PR &&
- ((lock->l_policy_data.l_extent.start <=
- req->l_policy_data.l_extent.start) &&
- (lock->l_policy_data.l_extent.end >=
- req->l_policy_data.l_extent.end))) {
- /* If we met a PR lock just like us or wider,
- and nobody down the list conflicted with
- it, that means we can skip processing of
- the rest of the list and safely place
- ourselves at the end of the list, or grant
- (dependent if we met an conflicting locks
- before in the list).
- In case of 1st enqueue only we continue
- traversing if there is something conflicting
- down the list because we need to make sure
- that something is marked as AST_SENT as well,
- in cse of empy worklist we would exit on
- first conflict met. */
- /* There IS a case where such flag is
- not set for a lock, yet it blocks
- something. Luckily for us this is
- only during destroy, so lock is
- exclusive. So here we are safe */
- if (!(lock->l_flags & LDLM_FL_AST_SENT)) {
- RETURN(compat);
- }
- }
+ lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
- /* non-group locks are compatible, overlap doesn't
- matter */
- if (likely(req_mode != LCK_GROUP))
- continue;
-
- /* If we are trying to get a GROUP lock and there is
- another one of this kind, we need to compare gid */
- if (req->l_policy_data.l_extent.gid ==
- lock->l_policy_data.l_extent.gid) {
- /* If existing lock with matched gid is granted,
- we grant new one too. */
- if (lock->l_req_mode == lock->l_granted_mode)
- RETURN(2);
-
- /* Otherwise we are scanning queue of waiting
- * locks and it means current request would
- * block along with existing lock (that is
- * already blocked.
- * If we are in nonblocking mode - return
- * immediately */
- if (*flags & LDLM_FL_BLOCK_NOWAIT) {
- compat = -EWOULDBLOCK;
- goto destroylock;
- }
- /* If this group lock is compatible with another
- * group lock on the waiting list, they must be
- * together in the list, so they can be granted
- * at the same time. Otherwise the later lock
- * can get stuck behind another, incompatible,
- * lock. */
- ldlm_resource_insert_lock_after(lock, req);
- /* Because 'lock' is not granted, we can stop
- * processing this queue and return immediately.
- * There is no need to check the rest of the
- * list. */
- RETURN(0);
- }
- }
+ if (req == lock)
+ break;
- if (unlikely(req_mode == LCK_GROUP &&
- (lock->l_req_mode != lock->l_granted_mode))) {
- scan = 1;
+ if (unlikely(scan)) {
+ /* We only get here if we are queuing GROUP lock
+ and met some incompatible one. The main idea of this
+ code is to insert GROUP lock past compatible GROUP
+ lock in the waiting queue or if there is not any,
+ then in front of first non-GROUP lock */
+ if (lock->l_req_mode != LCK_GROUP) {
+ /* Ok, we hit non-GROUP lock, there should be no
+ more GROUP locks later on, queue in front of
+ first non-GROUP lock */
+
+ ldlm_resource_insert_lock_after(lock, req);
+ cfs_list_del_init(&lock->l_res_link);
+ ldlm_resource_insert_lock_after(req, lock);
compat = 0;
- if (lock->l_req_mode != LCK_GROUP) {
- /* Ok, we hit non-GROUP lock, there should be no
- more GROUP locks later on, queue in front of
- first non-GROUP lock */
-
- ldlm_resource_insert_lock_after(lock, req);
- cfs_list_del_init(&lock->l_res_link);
- ldlm_resource_insert_lock_after(req, lock);
- break;
- }
- if (req->l_policy_data.l_extent.gid ==
- lock->l_policy_data.l_extent.gid) {
- /* found it */
- ldlm_resource_insert_lock_after(lock, req);
- break;
+ break;
+ }
+ if (req->l_policy_data.l_extent.gid ==
+ lock->l_policy_data.l_extent.gid) {
+ /* found it */
+ ldlm_resource_insert_lock_after(lock, req);
+ compat = 0;
+ break;
+ }
+ continue;
+ }
+
+ /* locks are compatible, overlap doesn't matter */
+ if (lockmode_compat(lock->l_req_mode, req_mode)) {
+ if (req_mode == LCK_PR &&
+ ((lock->l_policy_data.l_extent.start <=
+ req->l_policy_data.l_extent.start) &&
+ (lock->l_policy_data.l_extent.end >=
+ req->l_policy_data.l_extent.end))) {
+ /* If we met a PR lock just like us or wider,
+ and nobody down the list conflicted with
+ it, that means we can skip processing of
+ the rest of the list and safely place
+ ourselves at the end of the list, or grant
+ (dependent if we met an conflicting locks
+ before in the list).
+ In case of 1st enqueue only we continue
+ traversing if there is something conflicting
+ down the list because we need to make sure
+ that something is marked as AST_SENT as well,
+ in cse of empy worklist we would exit on
+ first conflict met. */
+ /* There IS a case where such flag is
+ not set for a lock, yet it blocks
+ something. Luckily for us this is
+ only during destroy, so lock is
+ exclusive. So here we are safe */
+ if (!(lock->l_flags & LDLM_FL_AST_SENT)) {
+ RETURN(compat);
}
- continue;
}
- if (unlikely(lock->l_req_mode == LCK_GROUP)) {
- /* If compared lock is GROUP, then requested is PR/PW/
- * so this is not compatible; extent range does not
- * matter */
+ /* non-group locks are compatible, overlap doesn't
+ matter */
+ if (likely(req_mode != LCK_GROUP))
+ continue;
+
+ /* If we are trying to get a GROUP lock and there is
+ another one of this kind, we need to compare gid */
+ if (req->l_policy_data.l_extent.gid ==
+ lock->l_policy_data.l_extent.gid) {
+ /* We are scanning queue of waiting
+ * locks and it means current request would
+ * block along with existing lock (that is
+ * already blocked.
+ * If we are in nonblocking mode - return
+ * immediately */
if (*flags & LDLM_FL_BLOCK_NOWAIT) {
compat = -EWOULDBLOCK;
goto destroylock;
- } else {
- *flags |= LDLM_FL_NO_TIMEOUT;
}
- } else if (lock->l_policy_data.l_extent.end < req_start ||
- lock->l_policy_data.l_extent.start > req_end) {
+ /* If this group lock is compatible with another
+ * group lock on the waiting list, they must be
+ * together in the list, so they can be granted
+ * at the same time. Otherwise the later lock
+ * can get stuck behind another, incompatible,
+ * lock. */
+ ldlm_resource_insert_lock_after(lock, req);
+ /* Because 'lock' is not granted, we can stop
+ * processing this queue and return immediately.
+ * There is no need to check the rest of the
+ * list. */
+ RETURN(0);
+ }
+ }
+
+ if (unlikely(req_mode == LCK_GROUP &&
+ (lock->l_req_mode != lock->l_granted_mode))) {
+ scan = 1;
+ compat = 0;
+ if (lock->l_req_mode != LCK_GROUP) {
+ /* Ok, we hit non-GROUP lock, there should
+ * be no more GROUP locks later on, queue in
+ * front of first non-GROUP lock */
+
+ ldlm_resource_insert_lock_after(lock, req);
+ cfs_list_del_init(&lock->l_res_link);
+ ldlm_resource_insert_lock_after(req, lock);
+ break;
+ }
+ if (req->l_policy_data.l_extent.gid ==
+ lock->l_policy_data.l_extent.gid) {
+ /* found it */
+ ldlm_resource_insert_lock_after(lock, req);
+ break;
+ }
+ continue;
+ }
+
+ if (unlikely(lock->l_req_mode == LCK_GROUP)) {
+ /* If compared lock is GROUP, then requested is PR/PW/
+ * so this is not compatible; extent range does not
+ * matter */
+ if (*flags & LDLM_FL_BLOCK_NOWAIT) {
+ compat = -EWOULDBLOCK;
+ goto destroylock;
+ } else {
+ *flags |= LDLM_FL_NO_TIMEOUT;
+ }
+ } else if (!work_list) {
+ if (lock->l_policy_data.l_extent.end < req_start ||
+ lock->l_policy_data.l_extent.start > req_end)
/* if a non group lock doesn't overlap skip it */
continue;
- } else if (lock->l_req_extent.end < req_start ||
- lock->l_req_extent.start > req_end) {
- /* false contention, the requests doesn't really overlap */
- check_contention = 0;
+ RETURN(0);
+ } else {
+ /* for waiting locks, count all non-compatible locks in
+ * traffic index */
+ ++req->l_traffic;
+ ++lock->l_traffic;
+
+ /* adjust policy */
+ if (lock->l_policy_data.l_extent.end < req_start) {
+ /* lock req
+ * ------------+
+ * ++++++ | +++++++
+ * + | +
+ * ++++++ | +++++++
+ * ------------+
+ */
+ if (lock->l_policy_data.l_extent.end >
+ req->l_policy_data.l_extent.start)
+ req->l_policy_data.l_extent.start =
+ lock->l_policy_data.l_extent.end+1;
+ continue;
+ } else if (lock->l_req_extent.end < req_start) {
+ /* lock req
+ * ------------------+
+ * ++++++ +++++++
+ * + + |
+ * ++++++ +++++++
+ * ------------------+
+ */
+ lock->l_policy_data.l_extent.end =
+ req_start - 1;
+ req->l_policy_data.l_extent.start =
+ req_start;
+ continue;
+ } else if (lock->l_policy_data.l_extent.start >
+ req_end) {
+ /* req lock
+ * +--------------
+ * +++++++ | +++++++
+ * + | +
+ * +++++++ | +++++++
+ * +--------------
+ */
+ if (lock->l_policy_data.l_extent.start <
+ req->l_policy_data.l_extent.end)
+ req->l_policy_data.l_extent.end =
+ lock->l_policy_data.l_extent.start-1;
+ continue;
+ } else if (lock->l_req_extent.start > req_end) {
+ /* req lock
+ * +----------------------
+ * +++++++ +++++++
+ * | + +
+ * +++++++ +++++++
+ * +----------------------
+ */
+ lock->l_policy_data.l_extent.start =
+ req_end + 1;
+ req->l_policy_data.l_extent.end=req_end;
+ continue;
}
+ } /* policy_adj */
- if (!work_list)
- RETURN(0);
-
+ compat = 0;
+ if (work_list) {
/* don't count conflicting glimpse locks */
- if (lock->l_req_mode == LCK_PR &&
- lock->l_policy_data.l_extent.start == 0 &&
- lock->l_policy_data.l_extent.end == OBD_OBJECT_EOF)
+ if (lock->l_flags & LDLM_FL_HAS_INTENT)
check_contention = 0;
*contended_locks += check_contention;
- compat = 0;
if (lock->l_blocking_ast)
ldlm_add_ast_work_item(lock, req, work_list);
}
}
+ RETURN(compat);
+destroylock:
+ cfs_list_del_init(&req->l_res_link);
+ ldlm_lock_destroy_nolock(req);
+ *err = compat;
+ RETURN(compat);
+}
+/* Determine if the lock is compatible with all locks on the queue.
+ * We stop walking the queue if we hit ourselves so we don't take
+ * conflicting locks enqueued after us into accound, or we'd wait forever.
+ *
+ * 0 if the lock is not compatible
+ * 1 if the lock is compatible
+ * 2 if this group lock is compatible and requires no further checking
+ * negative error, such as EWOULDBLOCK for group locks
+ *
+ * Note: policy adjustment only happends during the 1st lock enqueue procedure
+ */
+static int
+ldlm_extent_compat_queue(cfs_list_t *queue, struct ldlm_lock *req,
+ int *flags, ldlm_error_t *err,
+ cfs_list_t *work_list, int *contended_locks)
+{
+ struct ldlm_resource *res = req->l_resource;
+ ldlm_mode_t req_mode = req->l_req_mode;
+ __u64 req_start = req->l_req_extent.start;
+ __u64 req_end = req->l_req_extent.end;
+ int compat = 1;
+ ENTRY;
+
+ lockmode_verify(req_mode);
+
+ if (queue == &res->lr_granted)
+ compat = ldlm_extent_compat_granted_queue(queue, req, flags,
+ err, work_list,
+ contended_locks);
+ else
+ compat = ldlm_extent_compat_waiting_queue(queue, req, flags,
+ err, work_list,
+ contended_locks);
+
+
if (ldlm_check_contention(req, *contended_locks) &&
compat == 0 &&
(*flags & LDLM_FL_DENY_ON_CONTENTION) &&
EXIT;
}
+static inline void ldlm_process_extent_init(struct ldlm_lock *lock)
+{
+ lock->l_policy_data.l_extent.start = 0;
+ lock->l_policy_data.l_extent.end = OBD_OBJECT_EOF;
+}
+
+static inline void ldlm_process_extent_fini(struct ldlm_lock *lock, int *flags)
+{
+ if (lock->l_traffic > 4)
+ lock->l_policy_data.l_extent.start = lock->l_req_extent.start;
+ ldlm_extent_internal_policy_fixup(lock,
+ &lock->l_policy_data.l_extent,
+ lock->l_traffic);
+ if (lock->l_req_extent.start != lock->l_policy_data.l_extent.start ||
+ lock->l_req_extent.end != lock->l_policy_data.l_extent.end)
+ *flags |= LDLM_FL_LOCK_CHANGED;
+}
+
/* If first_enq is 0 (ie, called from ldlm_reprocess_queue):
* - blocking ASTs have already been sent
* - must call this function with the ns lock held
ldlm_resource_unlink_lock(lock);
- if (!OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_EVICT_RACE))
- ldlm_extent_policy(res, lock, flags);
+ if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_EVICT_RACE)) {
+ lock->l_policy_data.l_extent.start =
+ lock->l_req_extent.start;
+ lock->l_policy_data.l_extent.end =
+ lock->l_req_extent.end;
+ } else {
+ ldlm_process_extent_fini(lock, flags);
+ }
+
ldlm_grant_lock(lock, work_list);
RETURN(LDLM_ITER_CONTINUE);
}
restart:
contended_locks = 0;
+
+ ldlm_process_extent_init(lock);
+
rc = ldlm_extent_compat_queue(&res->lr_granted, lock, flags, err,
&rpc_list, &contended_locks);
if (rc < 0)
if (rc + rc2 == 2) {
grant:
- ldlm_extent_policy(res, lock, flags);
ldlm_resource_unlink_lock(lock);
+ ldlm_process_extent_fini(lock, flags);
ldlm_grant_lock(lock, NULL);
} else {
/* If either of the compat_queue()s returned failure, then we
git://git.whamcloud.com / fs / lustre-release.git / blobdiff