staging/lustre/clio: cl_lock simplification (06563b56) · Commits · e / devices / android_kernel_teracube_emerald

drivers/staging/lustre/lustre/include/cl_object.h

+28 −562

Original line number	Diff line number	Diff line
		@@ -82,7 +82,6 @@
		* - i_mutex
		* - PG_locked
		* - cl_object_header::coh_page_guard
		* - cl_object_header::coh_lock_guard
		* - lu_site::ls_guard
		*
		* See the top comment in cl_object.c for the description of overall locking and
		@@ -404,16 +403,6 @@ struct cl_object_header {
		* here.
		*/
		struct lu_object_header coh_lu;
		/** \name locks
		* \todo XXX move locks below to the separate cache-lines, they are
		* mostly useless otherwise.
		*/
		/** @{ */
		/** Lock protecting lock list. */
		spinlock_t coh_lock_guard;
		/** @} locks */
		/** List of cl_lock's granted for this object. */
		struct list_head coh_locks;

		/**
		* Parent object. It is assumed that an object has a well-defined
		@@ -795,16 +784,9 @@ struct cl_page_slice {
		/**
		* Lock mode. For the client extent locks.
		*
		* \warning: cl_lock_mode_match() assumes particular ordering here.
		* \ingroup cl_lock
		*/
		enum cl_lock_mode {
		/**
		* Mode of a lock that protects no data, and exists only as a
		* placeholder. This is used for `glimpse' requests. A phantom lock
		* might get promoted to real lock at some point.
		*/
		CLM_PHANTOM,
		CLM_READ,
		CLM_WRITE,
		CLM_GROUP
		@@ -1114,12 +1096,6 @@ static inline struct page cl_page_vmpage(struct cl_page page)
		* (struct cl_lock) and a list of layers (struct cl_lock_slice), linked to
		* cl_lock::cll_layers list through cl_lock_slice::cls_linkage.
		*
		* All locks for a given object are linked into cl_object_header::coh_locks
		* list (protected by cl_object_header::coh_lock_guard spin-lock) through
		* cl_lock::cll_linkage. Currently this list is not sorted in any way. We can
		* sort it in starting lock offset, or use altogether different data structure
		* like a tree.
		*
		* Typical cl_lock consists of the two layers:
		*
		* - vvp_lock (vvp specific data), and
		@@ -1320,289 +1296,21 @@ struct cl_lock_descr {
		__u32 cld_enq_flags;
		};

		#define DDESCR "%s(%d):[%lu, %lu]"
		#define DDESCR "%s(%d):[%lu, %lu]:%x"
		#define PDESCR(descr) \
		cl_lock_mode_name((descr)->cld_mode), (descr)->cld_mode, \
		(descr)->cld_start, (descr)->cld_end
		(descr)->cld_start, (descr)->cld_end, (descr)->cld_enq_flags

		const char *cl_lock_mode_name(const enum cl_lock_mode mode);

		/**
		* Lock state-machine states.
		*
		* \htmlonly
		* <pre>
		*
		* Possible state transitions:
		*
		* +------------------>NEW
		* \| \|
		* \| \| cl_enqueue_try()
		* \| \|
		* \| cl_unuse_try() V
		* \| +--------------QUEUING (*)
		* \| \| \|
		* \| \| \| cl_enqueue_try()
		* \| \| \|
		* \| \| cl_unuse_try() V
		* sub-lock \| +-------------ENQUEUED (*)
		* canceled \| \| \|
		* \| \| \| cl_wait_try()
		* \| \| \|
		* \| \| (R)
		* \| \| \|
		* \| \| V
		* \| \| HELD<---------+
		* \| \| \| \|
		* \| \| \| \| cl_use_try()
		* \| \| cl_unuse_try() \| \|
		* \| \| \| \|
		* \| \| V ---+
		* \| +------------>INTRANSIT (D) <--+
		* \| \| \|
		* \| cl_unuse_try() \| \| cached lock found
		* \| \| \| cl_use_try()
		* \| \| \|
		* \| V \|
		* +------------------CACHED---------+
		* \|
		* (C)
		* \|
		* V
		* FREEING
		*
		* Legend:
		*
		* In states marked with (*) transition to the same state (i.e., a loop
		* in the diagram) is possible.
		*
		* (R) is the point where Receive call-back is invoked: it allows layers
		* to handle arrival of lock reply.
		*
		* (C) is the point where Cancellation call-back is invoked.
		*
		* (D) is the transit state which means the lock is changing.
		*
		* Transition to FREEING state is possible from any other state in the
		* diagram in case of unrecoverable error.
		* </pre>
		* \endhtmlonly
		*
		* These states are for individual cl_lock object. Top-lock and its sub-locks
		* can be in the different states. Another way to say this is that we have
		* nested state-machines.
		*
		* Separate QUEUING and ENQUEUED states are needed to support non-blocking
		* operation for locks with multiple sub-locks. Imagine lock on a file F, that
		* intersects 3 stripes S0, S1, and S2. To enqueue F client has to send
		* enqueue to S0, wait for its completion, then send enqueue for S1, wait for
		* its completion and at last enqueue lock for S2, and wait for its
		* completion. In that case, top-lock is in QUEUING state while S0, S1 are
		* handled, and is in ENQUEUED state after enqueue to S2 has been sent (note
		* that in this case, sub-locks move from state to state, and top-lock remains
		* in the same state).
		*/
		enum cl_lock_state {
		/**
		* Lock that wasn't yet enqueued
		*/
		CLS_NEW,
		/**
		* Enqueue is in progress, blocking for some intermediate interaction
		* with the other side.
		*/
		CLS_QUEUING,
		/**
		* Lock is fully enqueued, waiting for server to reply when it is
		* granted.
		*/
		CLS_ENQUEUED,
		/**
		* Lock granted, actively used by some IO.
		*/
		CLS_HELD,
		/**
		* This state is used to mark the lock is being used, or unused.
		* We need this state because the lock may have several sublocks,
		* so it's impossible to have an atomic way to bring all sublocks
		* into CLS_HELD state at use case, or all sublocks to CLS_CACHED
		* at unuse case.
		* If a thread is referring to a lock, and it sees the lock is in this
		* state, it must wait for the lock.
		* See state diagram for details.
		*/
		CLS_INTRANSIT,
		/**
		* Lock granted, not used.
		*/
		CLS_CACHED,
		/**
		* Lock is being destroyed.
		*/
		CLS_FREEING,
		CLS_NR
		};

		enum cl_lock_flags {
		/**
		* lock has been cancelled. This flag is never cleared once set (by
		* cl_lock_cancel0()).
		*/
		CLF_CANCELLED = 1 << 0,
		/** cancellation is pending for this lock. */
		CLF_CANCELPEND = 1 << 1,
		/** destruction is pending for this lock. */
		CLF_DOOMED = 1 << 2,
		/** from enqueue RPC reply upcall. */
		CLF_FROM_UPCALL = 1 << 3,
		};

		/**
		* Lock closure.
		*
		* Lock closure is a collection of locks (both top-locks and sub-locks) that
		* might be updated in a result of an operation on a certain lock (which lock
		* this is a closure of).
		*
		* Closures are needed to guarantee dead-lock freedom in the presence of
		*
		* - nested state-machines (top-lock state-machine composed of sub-lock
		* state-machines), and
		*
		* - shared sub-locks.
		*
		* Specifically, many operations, such as lock enqueue, wait, unlock,
		* etc. start from a top-lock, and then operate on a sub-locks of this
		* top-lock, holding a top-lock mutex. When sub-lock state changes as a result
		* of such operation, this change has to be propagated to all top-locks that
		* share this sub-lock. Obviously, no natural lock ordering (e.g.,
		* top-to-bottom or bottom-to-top) captures this scenario, so try-locking has
		* to be used. Lock closure systematizes this try-and-repeat logic.
		*/
		struct cl_lock_closure {
		/**
		* Lock that is mutexed when closure construction is started. When
		* closure in is `wait' mode (cl_lock_closure::clc_wait), mutex on
		* origin is released before waiting.
		*/
		struct cl_lock *clc_origin;
		/**
		* List of enclosed locks, so far. Locks are linked here through
		* cl_lock::cll_inclosure.
		*/
		struct list_head clc_list;
		/**
		* True iff closure is in a `wait' mode. This determines what
		* cl_lock_enclosure() does when a lock L to be added to the closure
		* is currently mutexed by some other thread.
		*
		* If cl_lock_closure::clc_wait is not set, then closure construction
		* fails with CLO_REPEAT immediately.
		*
		* In wait mode, cl_lock_enclosure() waits until next attempt to build
		* a closure might succeed. To this end it releases an origin mutex
		* (cl_lock_closure::clc_origin), that has to be the only lock mutex
		* owned by the current thread, and then waits on L mutex (by grabbing
		* it and immediately releasing), before returning CLO_REPEAT to the
		* caller.
		*/
		int clc_wait;
		/** Number of locks in the closure. */
		int clc_nr;
		};

		/**
		* Layered client lock.
		*/
		struct cl_lock {
		/** Reference counter. */
		atomic_t cll_ref;
		/** List of slices. Immutable after creation. */
		struct list_head cll_layers;
		/**
		* Linkage into cl_lock::cll_descr::cld_obj::coh_locks list. Protected
		* by cl_lock::cll_descr::cld_obj::coh_lock_guard.
		*/
		struct list_head cll_linkage;
		/**
		* Parameters of this lock. Protected by
		* cl_lock::cll_descr::cld_obj::coh_lock_guard nested within
		* cl_lock::cll_guard. Modified only on lock creation and in
		* cl_lock_modify().
		*/
		/** lock attribute, extent, cl_object, etc. */
		struct cl_lock_descr cll_descr;
		/** Protected by cl_lock::cll_guard. */
		enum cl_lock_state cll_state;
		/** signals state changes. */
		wait_queue_head_t cll_wq;
		/**
		* Recursive lock, most fields in cl_lock{} are protected by this.
		*
		* Locking rules: this mutex is never held across network
		* communication, except when lock is being canceled.
		*
		* Lock ordering: a mutex of a sub-lock is taken first, then a mutex
		* on a top-lock. Other direction is implemented through a
		* try-lock-repeat loop. Mutices of unrelated locks can be taken only
		* by try-locking.
		*
		* \see osc_lock_enqueue_wait(), lov_lock_cancel(), lov_sublock_wait().
		*/
		struct mutex cll_guard;
		struct task_struct *cll_guarder;
		int cll_depth;

		/**
		* the owner for INTRANSIT state
		*/
		struct task_struct *cll_intransit_owner;
		int cll_error;
		/**
		* Number of holds on a lock. A hold prevents a lock from being
		* canceled and destroyed. Protected by cl_lock::cll_guard.
		*
		* \see cl_lock_hold(), cl_lock_unhold(), cl_lock_release()
		*/
		int cll_holds;
		/**
		* Number of lock users. Valid in cl_lock_state::CLS_HELD state
		* only. Lock user pins lock in CLS_HELD state. Protected by
		* cl_lock::cll_guard.
		*
		* \see cl_wait(), cl_unuse().
		*/
		int cll_users;
		/**
		* Flag bit-mask. Values from enum cl_lock_flags. Updates are
		* protected by cl_lock::cll_guard.
		*/
		unsigned long cll_flags;
		/**
		* A linkage into a list of locks in a closure.
		*
		* \see cl_lock_closure
		*/
		struct list_head cll_inclosure;
		/**
		* Confict lock at queuing time.
		*/
		struct cl_lock *cll_conflict;
		/**
		* A list of references to this lock, for debugging.
		*/
		struct lu_ref cll_reference;
		/**
		* A list of holds on this lock, for debugging.
		*/
		struct lu_ref cll_holders;
		/**
		* A reference for cl_lock::cll_descr::cld_obj. For debugging.
		*/
		struct lu_ref_link cll_obj_ref;
		#ifdef CONFIG_LOCKDEP
		/* "dep_map" name is assumed by lockdep.h macros. */
		struct lockdep_map dep_map;
		#endif
		};

		/**
		@@ -1621,171 +1329,33 @@ struct cl_lock_slice {
		struct list_head cls_linkage;
		};

		/**
		* Possible (non-error) return values of ->clo_{enqueue,wait,unlock}().
		*
		* NOTE: lov_subresult() depends on ordering here.
		*/
		enum cl_lock_transition {
		/** operation cannot be completed immediately. Wait for state change. */
		CLO_WAIT = 1,
		/** operation had to release lock mutex, restart. */
		CLO_REPEAT = 2,
		/** lower layer re-enqueued. */
		CLO_REENQUEUED = 3,
		};

		/**
		*
		* \see vvp_lock_ops, lov_lock_ops, lovsub_lock_ops, osc_lock_ops
		*/
		struct cl_lock_operations {
		/**
		* \name statemachine
		*
		* State machine transitions. These 3 methods are called to transfer
		* lock from one state to another, as described in the commentary
		* above enum #cl_lock_state.
		*
		* \retval 0 this layer has nothing more to do to before
		* transition to the target state happens;
		*
		* \retval CLO_REPEAT method had to release and re-acquire cl_lock
		* mutex, repeat invocation of transition method
		* across all layers;
		*
		* \retval CLO_WAIT this layer cannot move to the target state
		* immediately, as it has to wait for certain event
		* (e.g., the communication with the server). It
		* is guaranteed, that when the state transfer
		* becomes possible, cl_lock::cll_wq wait-queue
		* is signaled. Caller can wait for this event by
		* calling cl_lock_state_wait();
		*
		* \retval -ve failure, abort state transition, move the lock
		* into cl_lock_state::CLS_FREEING state, and set
		* cl_lock::cll_error.
		*
		* Once all layers voted to agree to transition (by returning 0), lock
		* is moved into corresponding target state. All state transition
		* methods are optional.
		*/
		/** @{ */
		/**
		* Attempts to enqueue the lock. Called top-to-bottom.
		*
		* \retval 0 this layer has enqueued the lock successfully
		* \retval >0 this layer has enqueued the lock, but need to wait on
		* @anchor for resources
		* \retval -ve failure
		*
		* \see ccc_lock_enqueue(), lov_lock_enqueue(), lovsub_lock_enqueue(),
		* \see osc_lock_enqueue()
		*/
		int (clo_enqueue)(const struct lu_env env,
		const struct cl_lock_slice *slice,
		struct cl_io *io, __u32 enqflags);
		/**
		* Attempts to wait for enqueue result. Called top-to-bottom.
		*
		* \see ccc_lock_wait(), lov_lock_wait(), osc_lock_wait()
		*/
		int (clo_wait)(const struct lu_env env,
		const struct cl_lock_slice *slice);
		/**
		* Attempts to unlock the lock. Called bottom-to-top. In addition to
		* usual return values of lock state-machine methods, this can return
		* -ESTALE to indicate that lock cannot be returned to the cache, and
		* has to be re-initialized.
		* unuse is a one-shot operation, so it must NOT return CLO_WAIT.
		*
		* \see ccc_lock_unuse(), lov_lock_unuse(), osc_lock_unuse()
		*/
		int (clo_unuse)(const struct lu_env env,
		const struct cl_lock_slice *slice);
		/**
		* Notifies layer that cached lock is started being used.
		*
		* \pre lock->cll_state == CLS_CACHED
		*
		* \see lov_lock_use(), osc_lock_use()
		*/
		int (clo_use)(const struct lu_env env,
		const struct cl_lock_slice *slice);
		/** @} statemachine */
		/**
		* A method invoked when lock state is changed (as a result of state
		* transition). This is used, for example, to track when the state of
		* a sub-lock changes, to propagate this change to the corresponding
		* top-lock. Optional
		*
		* \see lovsub_lock_state()
		*/
		void (clo_state)(const struct lu_env env,
		const struct cl_lock_slice *slice,
		enum cl_lock_state st);
		/**
		* Returns true, iff given lock is suitable for the given io, idea
		* being, that there are certain "unsafe" locks, e.g., ones acquired
		* for O_APPEND writes, that we don't want to re-use for a normal
		* write, to avoid the danger of cascading evictions. Optional. Runs
		* under cl_object_header::coh_lock_guard.
		*
		* XXX this should take more information about lock needed by
		* io. Probably lock description or something similar.
		*
		* \see lov_fits_into()
		*/
		int (clo_fits_into)(const struct lu_env env,
		const struct cl_lock_slice *slice,
		const struct cl_lock_descr *need,
		const struct cl_io *io);
		/**
		* \name ast
		* Asynchronous System Traps. All of then are optional, all are
		* executed bottom-to-top.
		*/
		/** @{ */

		struct cl_io io, struct cl_sync_io anchor);
		/**
		* Cancellation callback. Cancel a lock voluntarily, or under
		* the request of server.
		* Cancel a lock, release its DLM lock ref, while does not cancel the
		* DLM lock
		*/
		void (clo_cancel)(const struct lu_env env,
		const struct cl_lock_slice *slice);
		/**
		* Lock weighting ast. Executed to estimate how precious this lock
		* is. The sum of results across all layers is used to determine
		* whether lock worth keeping in cache given present memory usage.
		*
		* \see osc_lock_weigh(), vvp_lock_weigh(), lovsub_lock_weigh().
		*/
		unsigned long (clo_weigh)(const struct lu_env env,
		const struct cl_lock_slice *slice);
		/** @} ast */

		/**
		* \see lovsub_lock_closure()
		*/
		int (clo_closure)(const struct lu_env env,
		const struct cl_lock_slice *slice,
		struct cl_lock_closure *closure);
		/**
		* Executed bottom-to-top when lock description changes (e.g., as a
		* result of server granting more generous lock than was requested).
		*
		* \see lovsub_lock_modify()
		*/
		int (clo_modify)(const struct lu_env env,
		const struct cl_lock_slice *slice,
		const struct cl_lock_descr *updated);
		/**
		* Notifies layers (bottom-to-top) that lock is going to be
		* destroyed. Responsibility of layers is to prevent new references on
		* this lock from being acquired once this method returns.
		*
		* This can be called multiple times due to the races.
		*
		* \see cl_lock_delete()
		* \see osc_lock_delete(), lovsub_lock_delete()
		*/
		void (clo_delete)(const struct lu_env env,
		const struct cl_lock_slice *slice);
		/** @} */
		/**
		* Destructor. Frees resources and the slice.
		*
		@@ -2164,10 +1734,14 @@ enum cl_enq_flags {
		* for async glimpse lock.
		*/
		CEF_AGL = 0x00000020,
		/**
		* enqueue a lock to test DLM lock existence.
		*/
		CEF_PEEK = 0x00000040,
		/**
		* mask of enq_flags.
		*/
		CEF_MASK = 0x0000003f,
		CEF_MASK = 0x0000007f,
		};

		/**
		@@ -2177,12 +1751,12 @@ enum cl_enq_flags {
		struct cl_io_lock_link {
		/** linkage into one of cl_lockset lists. */
		struct list_head cill_linkage;
		struct cl_lock_descr cill_descr;
		struct cl_lock *cill_lock;
		struct cl_lock cill_lock;
		/** optional destructor */
		void (cill_fini)(const struct lu_env env,
		struct cl_io_lock_link *link);
		};
		#define cill_descr cill_lock.cll_descr

		/**
		* Lock-set represents a collection of locks, that io needs at a
		@@ -2216,8 +1790,6 @@ struct cl_io_lock_link {
		struct cl_lockset {
		/** locks to be acquired. */
		struct list_head cls_todo;
		/** locks currently being processed. */
		struct list_head cls_curr;
		/** locks acquired. */
		struct list_head cls_done;
		};
		@@ -2581,9 +2153,7 @@ struct cl_site {
		* and top-locks (and top-pages) are accounted here.
		*/
		struct cache_stats cs_pages;
		struct cache_stats cs_locks;
		atomic_t cs_pages_state[CPS_NR];
		atomic_t cs_locks_state[CLS_NR];
		};

		int cl_site_init(struct cl_site s, struct cl_device top);
		@@ -2707,7 +2277,7 @@ int cl_object_glimpse(const struct lu_env env, struct cl_object obj,
		struct ost_lvb *lvb);
		int cl_conf_set(const struct lu_env env, struct cl_object obj,
		const struct cl_object_conf *conf);
		void cl_object_prune(const struct lu_env env, struct cl_object obj);
		int cl_object_prune(const struct lu_env env, struct cl_object obj);
		void cl_object_kill(const struct lu_env env, struct cl_object obj);

		/**
		@@ -2845,121 +2415,17 @@ void cl_lock_descr_print(const struct lu_env env, void cookie,
		* @{
		*/

		struct cl_lock cl_lock_hold(const struct lu_env env, const struct cl_io *io,
		const struct cl_lock_descr *need,
		const char scope, const void source);
		struct cl_lock cl_lock_peek(const struct lu_env env, const struct cl_io *io,
		const struct cl_lock_descr *need,
		const char scope, const void source);
		struct cl_lock cl_lock_request(const struct lu_env env, struct cl_io *io,
		const struct cl_lock_descr *need,
		const char scope, const void source);
		struct cl_lock cl_lock_at_pgoff(const struct lu_env env,
		struct cl_object *obj, pgoff_t index,
		struct cl_lock *except, int pending,
		int canceld);
		int cl_lock_request(const struct lu_env env, struct cl_io io,
		struct cl_lock *lock);
		int cl_lock_init(const struct lu_env env, struct cl_lock lock,
		const struct cl_io *io);
		void cl_lock_fini(const struct lu_env env, struct cl_lock lock);
		const struct cl_lock_slice cl_lock_at(const struct cl_lock lock,
		const struct lu_device_type *dtype);

		void cl_lock_get(struct cl_lock *lock);
		void cl_lock_get_trust(struct cl_lock *lock);
		void cl_lock_put(const struct lu_env env, struct cl_lock lock);
		void cl_lock_hold_add(const struct lu_env env, struct cl_lock lock,
		const char scope, const void source);
		void cl_lock_hold_release(const struct lu_env env, struct cl_lock lock,
		const char scope, const void source);
		void cl_lock_unhold(const struct lu_env env, struct cl_lock lock,
		const char scope, const void source);
		void cl_lock_release(const struct lu_env env, struct cl_lock lock,
		const char scope, const void source);
		void cl_lock_user_add(const struct lu_env env, struct cl_lock lock);
		void cl_lock_user_del(const struct lu_env env, struct cl_lock lock);

		int cl_lock_is_intransit(struct cl_lock *lock);

		int cl_lock_enqueue_wait(const struct lu_env env, struct cl_lock lock,
		int keep_mutex);

		/** \name statemachine statemachine
		* Interface to lock state machine consists of 3 parts:
		*
		* - "try" functions that attempt to effect a state transition. If state
		* transition is not possible right now (e.g., if it has to wait for some
		* asynchronous event to occur), these functions return
		* cl_lock_transition::CLO_WAIT.
		*
		* - "non-try" functions that implement synchronous blocking interface on
		* top of non-blocking "try" functions. These functions repeatedly call
		* corresponding "try" versions, and if state transition is not possible
		* immediately, wait for lock state change.
		*
		* - methods from cl_lock_operations, called by "try" functions. Lock can
		* be advanced to the target state only when all layers voted that they
		* are ready for this transition. "Try" functions call methods under lock
		* mutex. If a layer had to release a mutex, it re-acquires it and returns
		* cl_lock_transition::CLO_REPEAT, causing "try" function to call all
		* layers again.
		*
		* TRY NON-TRY METHOD FINAL STATE
		*
		* cl_enqueue_try() cl_enqueue() cl_lock_operations::clo_enqueue() CLS_ENQUEUED
		*
		* cl_wait_try() cl_wait() cl_lock_operations::clo_wait() CLS_HELD
		*
		* cl_unuse_try() cl_unuse() cl_lock_operations::clo_unuse() CLS_CACHED
		*
		* cl_use_try() NONE cl_lock_operations::clo_use() CLS_HELD
		*
		* @{
		*/

		int cl_wait(const struct lu_env env, struct cl_lock lock);
		void cl_unuse(const struct lu_env env, struct cl_lock lock);
		int cl_enqueue_try(const struct lu_env env, struct cl_lock lock,
		struct cl_io *io, __u32 flags);
		int cl_unuse_try(const struct lu_env env, struct cl_lock lock);
		int cl_wait_try(const struct lu_env env, struct cl_lock lock);
		int cl_use_try(const struct lu_env env, struct cl_lock lock, int atomic);

		/** @} statemachine */

		void cl_lock_signal(const struct lu_env env, struct cl_lock lock);
		int cl_lock_state_wait(const struct lu_env env, struct cl_lock lock);
		void cl_lock_state_set(const struct lu_env env, struct cl_lock lock,
		enum cl_lock_state state);
		int cl_queue_match(const struct list_head *queue,
		const struct cl_lock_descr *need);

		void cl_lock_mutex_get(const struct lu_env env, struct cl_lock lock);
		void cl_lock_mutex_put(const struct lu_env env, struct cl_lock lock);
		int cl_lock_is_mutexed(struct cl_lock *lock);
		int cl_lock_nr_mutexed(const struct lu_env *env);
		int cl_lock_discard_pages(const struct lu_env env, struct cl_lock lock);
		int cl_lock_ext_match(const struct cl_lock_descr *has,
		const struct cl_lock_descr *need);
		int cl_lock_descr_match(const struct cl_lock_descr *has,
		const struct cl_lock_descr *need);
		int cl_lock_mode_match(enum cl_lock_mode has, enum cl_lock_mode need);
		int cl_lock_modify(const struct lu_env env, struct cl_lock lock,
		const struct cl_lock_descr *desc);

		void cl_lock_closure_init(const struct lu_env *env,
		struct cl_lock_closure *closure,
		struct cl_lock *origin, int wait);
		void cl_lock_closure_fini(struct cl_lock_closure *closure);
		int cl_lock_closure_build(const struct lu_env env, struct cl_lock lock,
		struct cl_lock_closure *closure);
		void cl_lock_disclosure(const struct lu_env *env,
		struct cl_lock_closure *closure);
		int cl_lock_enclosure(const struct lu_env env, struct cl_lock lock,
		struct cl_lock_closure *closure);

		void cl_lock_release(const struct lu_env env, struct cl_lock lock);
		int cl_lock_enqueue(const struct lu_env env, struct cl_io io,
		struct cl_lock lock, struct cl_sync_io anchor);
		void cl_lock_cancel(const struct lu_env env, struct cl_lock lock);
		void cl_lock_delete(const struct lu_env env, struct cl_lock lock);
		void cl_lock_error(const struct lu_env env, struct cl_lock lock, int error);
		void cl_locks_prune(const struct lu_env env, struct cl_object obj, int wait);

		unsigned long cl_lock_weigh(const struct lu_env env, struct cl_lock lock);

		/** @} cl_lock */

drivers/staging/lustre/lustre/include/lclient.h

+10 −16

File changed.

Preview size limit exceeded, changes collapsed.

drivers/staging/lustre/lustre/include/lustre/lustre_idl.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -2582,6 +2582,8 @@ struct ldlm_extent {
		__u64 gid;
		};

		#define LDLM_GID_ANY ((__u64)-1)

		static inline int ldlm_extent_overlap(struct ldlm_extent *ex1,
		struct ldlm_extent *ex2)
		{

drivers/staging/lustre/lustre/include/lustre_dlm.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -71,6 +71,7 @@ struct obd_device;
		*/
		enum ldlm_error {
		ELDLM_OK = 0,
		ELDLM_LOCK_MATCHED = 1,

		ELDLM_LOCK_CHANGED = 300,
		ELDLM_LOCK_ABORTED = 301,

drivers/staging/lustre/lustre/ldlm/ldlm_lib.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -748,6 +748,7 @@ int ldlm_error2errno(enum ldlm_error error)

		switch (error) {
		case ELDLM_OK:
		case ELDLM_LOCK_MATCHED:
		result = 0;
		break;
		case ELDLM_LOCK_CHANGED: