-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2014, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Internal interfaces of OSC layer.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
+ * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
*/
#ifndef OSC_CL_INTERNAL_H
#define OSC_CL_INTERNAL_H
-#ifdef __KERNEL__
-# include <libcfs/libcfs.h>
-#else
-# include <liblustre.h>
-#endif
-
+#include <libcfs/libcfs.h>
#include <obd.h>
/* osc_build_res_name() */
-#include <obd_ost.h>
#include <cl_object.h>
#include "osc_internal.h"
-/** \addtogroup osc osc @{ */
+/** \defgroup osc osc
+ * @{
+ */
+
+struct osc_extent;
/**
* State maintained by osc layer for each IO context.
struct cl_io_slice oi_cl;
/** true if this io is lockless. */
int oi_lockless;
-
- struct obdo oi_oa;
- struct osc_punch_cbargs {
- int opc_rc;
- struct completion opc_sync;
- } oi_punch_cbarg;
+ /** how many LRU pages are reserved for this IO */
+ unsigned long oi_lru_reserved;
+
+ /** active extents, we know how many bytes is going to be written,
+ * so having an active extent will prevent it from being fragmented */
+ struct osc_extent *oi_active;
+ /** partially truncated extent, we need to hold this extent to prevent
+ * page writeback from happening. */
+ struct osc_extent *oi_trunc;
+ /** write osc_lock for this IO, used by osc_extent_find(). */
+ struct osc_lock *oi_write_osclock;
+
+ struct obd_info oi_info;
+ struct obdo oi_oa;
+ struct osc_async_cbargs {
+ bool opc_rpc_sent;
+ int opc_rc;
+ struct completion opc_sync;
+ } oi_cbarg;
};
/**
struct osc_io os_io;
};
+#define OTI_PVEC_SIZE 256
struct osc_thread_info {
struct ldlm_res_id oti_resname;
ldlm_policy_data_t oti_policy;
struct cl_lock_descr oti_descr;
struct cl_attr oti_attr;
struct lustre_handle oti_handle;
- struct cl_lock_closure oti_closure;
struct cl_page_list oti_plist;
+ struct cl_io oti_io;
+ void *oti_pvec[OTI_PVEC_SIZE];
+ /**
+ * Fields used by cl_lock_discard_pages().
+ */
+ pgoff_t oti_next_index;
+ pgoff_t oti_fn_index; /* first non-overlapped index */
+ struct cl_sync_io oti_anchor;
};
struct osc_object {
*/
int oo_contended;
cfs_time_t oo_contention_time;
-#ifdef INVARIANT_CHECK
+#ifdef CONFIG_LUSTRE_DEBUG_EXPENSIVE_CHECK
/**
* IO context used for invariant checks in osc_lock_has_pages().
*/
struct cl_io oo_debug_io;
/** Serialization object for osc_object::oo_debug_io. */
- struct mutex oo_debug_mutex;
+ struct mutex oo_debug_mutex;
#endif
/**
* List of pages in transfer.
*/
- struct list_head oo_inflight[CRT_NR];
+ struct list_head oo_inflight[CRT_NR];
/**
* Lock, protecting ccc_object::cob_inflight, because a seat-belt is
* locked during take-off and landing.
*/
- spinlock_t oo_seatbelt;
+ spinlock_t oo_seatbelt;
+
+ /**
+ * used by the osc to keep track of what objects to build into rpcs.
+ * Protected by client_obd->cli_loi_list_lock.
+ */
+ struct list_head oo_ready_item;
+ struct list_head oo_hp_ready_item;
+ struct list_head oo_write_item;
+ struct list_head oo_read_item;
+
+ /**
+ * extent is a red black tree to manage (async) dirty pages.
+ */
+ struct rb_root oo_root;
+ /**
+ * Manage write(dirty) extents.
+ */
+ struct list_head oo_hp_exts; /* list of hp extents */
+ struct list_head oo_urgent_exts; /* list of writeback extents */
+ struct list_head oo_rpc_exts;
+
+ struct list_head oo_reading_exts;
+
+ atomic_t oo_nr_reads;
+ atomic_t oo_nr_writes;
+
+ /** Protect extent tree. Will be used to protect
+ * oo_{read|write}_pages soon. */
+ spinlock_t oo_lock;
+
+ /**
+ * Radix tree for caching pages
+ */
+ struct radix_tree_root oo_tree;
+ spinlock_t oo_tree_lock;
+ unsigned long oo_npages;
+
+ /* Protect osc_lock this osc_object has */
+ spinlock_t oo_ol_spin;
+ struct list_head oo_ol_list;
};
+static inline void osc_object_lock(struct osc_object *obj)
+{
+ spin_lock(&obj->oo_lock);
+}
+
+static inline int osc_object_trylock(struct osc_object *obj)
+{
+ return spin_trylock(&obj->oo_lock);
+}
+
+static inline void osc_object_unlock(struct osc_object *obj)
+{
+ spin_unlock(&obj->oo_lock);
+}
+
+static inline int osc_object_is_locked(struct osc_object *obj)
+{
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+ return spin_is_locked(&obj->oo_lock);
+#else
+ /*
+ * It is not perfect to return true all the time.
+ * But since this function is only used for assertion
+ * and checking, it seems OK.
+ */
+ return 1;
+#endif
+}
+
/*
* Lock "micro-states" for osc layer.
*/
OLS_ENQUEUED,
OLS_UPCALL_RECEIVED,
OLS_GRANTED,
- OLS_RELEASED,
- OLS_BLOCKED,
OLS_CANCELLED
};
*
* Interaction with DLM.
*
- * CLIO enqueues all DLM locks through ptlrpcd (that is, in "async" mode).
- *
* Once receive upcall is invoked, osc_lock remembers a handle of DLM lock in
- * osc_lock::ols_handle and a pointer to that lock in osc_lock::ols_lock.
+ * osc_lock::ols_handle and a pointer to that lock in osc_lock::ols_dlmlock.
*
* This pointer is protected through a reference, acquired by
* osc_lock_upcall0(). Also, an additional reference is acquired by
* future.
*/
struct osc_lock {
- struct cl_lock_slice ols_cl;
- /** underlying DLM lock */
- struct ldlm_lock *ols_lock;
- /** lock value block */
- struct ost_lvb ols_lvb;
- /** DLM flags with which osc_lock::ols_lock was enqueued */
- int ols_flags;
- /** osc_lock::ols_lock handle */
- struct lustre_handle ols_handle;
- struct ldlm_enqueue_info ols_einfo;
- enum osc_lock_state ols_state;
+ struct cl_lock_slice ols_cl;
+ /** Internal lock to protect states, etc. */
+ spinlock_t ols_lock;
+ /** Owner sleeps on this channel for state change */
+ struct cl_sync_io *ols_owner;
+ /** waiting list for this lock to be cancelled */
+ struct list_head ols_waiting_list;
+ /** wait entry of ols_waiting_list */
+ struct list_head ols_wait_entry;
+ /** list entry for osc_object::oo_ol_list */
+ struct list_head ols_nextlock_oscobj;
+
+ /** underlying DLM lock */
+ struct ldlm_lock *ols_dlmlock;
+ /** DLM flags with which osc_lock::ols_lock was enqueued */
+ __u64 ols_flags;
+ /** osc_lock::ols_lock handle */
+ struct lustre_handle ols_handle;
+ struct ldlm_enqueue_info ols_einfo;
+ enum osc_lock_state ols_state;
+ /** lock value block */
+ struct ost_lvb ols_lvb;
+
/**
* true, if ldlm_lock_addref() was called against
* osc_lock::ols_lock. This is used for sanity checking.
*/
ols_locklessable:1,
/**
- * set by osc_lock_use() to wait until blocking AST enters into
- * osc_ldlm_blocking_ast0(), so that cl_lock mutex can be used for
- * further synchronization.
- */
- ols_ast_wait:1,
- /**
- * If the data of this lock has been flushed to server side.
- */
- ols_flush:1,
- /**
* if set, the osc_lock is a glimpse lock. For glimpse locks, we treat
* the EVAVAIL error as torerable, this will make upper logic happy
* to wait all glimpse locks to each OSTs to be completed.
* granted.
* Glimpse lock should be destroyed immediately after use.
*/
- ols_glimpse:1;
+ ols_glimpse:1,
/**
- * IO that owns this lock. This field is used for a dead-lock
- * avoidance by osc_lock_enqueue().
- *
- * \see osc_deadlock_is_possible()
+ * For async glimpse lock.
*/
- struct osc_io *ols_owner;
+ ols_agl:1;
};
*/
ops_temp:1,
/**
- * True iff page was created by a user with `appropriate privileges'.
- */
- ops_ignore_quota:1;
- /**
- * Linkage into a per-osc_object list of pages in flight. For
- * debugging.
- */
- struct list_head ops_inflight;
- /**
- * Thread that submitted this page for transfer. For debugging.
- */
- cfs_task_t *ops_submitter;
+ * in LRU?
+ */
+ ops_in_lru:1,
+ /**
+ * Set if the page must be transferred with OBD_BRW_SRVLOCK.
+ */
+ ops_srvlock:1;
+ /**
+ * lru page list. See osc_lru_{del|use}() in osc_page.c for usage.
+ */
+ struct list_head ops_lru;
+ /**
+ * Linkage into a per-osc_object list of pages in flight. For
+ * debugging.
+ */
+ struct list_head ops_inflight;
+ /**
+ * Thread that submitted this page for transfer. For debugging.
+ */
+ struct task_struct *ops_submitter;
+ /**
+ * Submit time - the time when the page is starting RPC. For debugging.
+ */
+ cfs_time_t ops_submit_time;
};
-extern cfs_mem_cache_t *osc_page_kmem;
-extern cfs_mem_cache_t *osc_lock_kmem;
-extern cfs_mem_cache_t *osc_object_kmem;
-extern cfs_mem_cache_t *osc_thread_kmem;
-extern cfs_mem_cache_t *osc_session_kmem;
-extern cfs_mem_cache_t *osc_req_kmem;
+extern struct kmem_cache *osc_lock_kmem;
+extern struct kmem_cache *osc_object_kmem;
+extern struct kmem_cache *osc_thread_kmem;
+extern struct kmem_cache *osc_session_kmem;
+extern struct kmem_cache *osc_req_kmem;
+extern struct kmem_cache *osc_extent_kmem;
extern struct lu_device_type osc_device_type;
extern struct lu_context_key osc_key;
struct lu_object *osc_object_alloc(const struct lu_env *env,
const struct lu_object_header *hdr,
struct lu_device *dev);
-struct cl_page *osc_page_init (const struct lu_env *env,
- struct cl_object *obj,
- struct cl_page *page, cfs_page_t *vmpage);
+int osc_page_init(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, pgoff_t ind);
-void osc_lock_build_res(const struct lu_env *env, const struct osc_object *obj,
- struct ldlm_res_id *resname);
void osc_index2policy (ldlm_policy_data_t *policy, const struct cl_object *obj,
pgoff_t start, pgoff_t end);
int osc_lvb_print (const struct lu_env *env, void *cookie,
lu_printer_t p, const struct ost_lvb *lvb);
-void osc_io_submit_page(const struct lu_env *env,
- struct osc_io *oio, struct osc_page *opg,
- enum cl_req_type crt);
+
+void osc_lru_add_batch(struct client_obd *cli, struct list_head *list);
+void osc_page_submit(const struct lu_env *env, struct osc_page *opg,
+ enum cl_req_type crt, int brw_flags);
+int osc_cancel_async_page(const struct lu_env *env, struct osc_page *ops);
+int osc_set_async_flags(struct osc_object *obj, struct osc_page *opg,
+ obd_flag async_flags);
+int osc_prep_async_page(struct osc_object *osc, struct osc_page *ops,
+ struct page *page, loff_t offset);
+int osc_queue_async_io(const struct lu_env *env, struct cl_io *io,
+ struct osc_page *ops);
+int osc_page_cache_add(const struct lu_env *env,
+ const struct cl_page_slice *slice, struct cl_io *io);
+int osc_teardown_async_page(const struct lu_env *env, struct osc_object *obj,
+ struct osc_page *ops);
+int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
+ struct osc_page *ops);
+int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
+ struct list_head *list, int cmd, int brw_flags);
+int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
+ struct osc_object *obj, __u64 size);
+void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
+ struct osc_object *obj);
+int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
+ pgoff_t start, pgoff_t end, int hp, int discard);
+int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
+ pgoff_t start, pgoff_t end);
+void osc_io_unplug(const struct lu_env *env, struct client_obd *cli,
+ struct osc_object *osc, pdl_policy_t pol);
+int lru_queue_work(const struct lu_env *env, void *data);
void osc_object_set_contended (struct osc_object *obj);
void osc_object_clear_contended(struct osc_object *obj);
return lu2osc_dev(obj->oo_cl.co_lu.lo_dev)->od_exp;
}
+static inline struct client_obd *osc_cli(const struct osc_object *obj)
+{
+ return &osc_export(obj)->exp_obd->u.cli;
+}
+
static inline struct osc_object *cl2osc(const struct cl_object *obj)
{
LINVRNT(osc_is_object(&obj->co_lu));
return container_of0(obj, struct osc_object, oo_cl);
}
+static inline struct cl_object *osc2cl(const struct osc_object *obj)
+{
+ return (struct cl_object *)&obj->oo_cl;
+}
+
static inline ldlm_mode_t osc_cl_lock2ldlm(enum cl_lock_mode mode)
{
- LASSERT(mode == CLM_READ || mode == CLM_WRITE);
- return mode == CLM_READ ? LCK_PR : LCK_PW;
+ LASSERT(mode == CLM_READ || mode == CLM_WRITE || mode == CLM_GROUP);
+ if (mode == CLM_READ)
+ return LCK_PR;
+ else if (mode == CLM_WRITE)
+ return LCK_PW;
+ else
+ return LCK_GROUP;
}
static inline enum cl_lock_mode osc_ldlm2cl_lock(ldlm_mode_t mode)
{
- LASSERT(mode == LCK_PR || mode == LCK_PW);
- return mode == LCK_PR ? CLM_READ : CLM_WRITE;
+ LASSERT(mode == LCK_PR || mode == LCK_PW || mode == LCK_GROUP);
+ if (mode == LCK_PR)
+ return CLM_READ;
+ else if (mode == LCK_PW)
+ return CLM_WRITE;
+ else
+ return CLM_GROUP;
}
static inline struct osc_page *cl2osc_page(const struct cl_page_slice *slice)
return container_of0(slice, struct osc_page, ops_cl);
}
+static inline struct osc_page *oap2osc(struct osc_async_page *oap)
+{
+ return container_of0(oap, struct osc_page, ops_oap);
+}
+
+static inline pgoff_t osc_index(struct osc_page *opg)
+{
+ return opg->ops_cl.cpl_index;
+}
+
+static inline struct cl_page *oap2cl_page(struct osc_async_page *oap)
+{
+ return oap2osc(oap)->ops_cl.cpl_page;
+}
+
+static inline struct osc_page *oap2osc_page(struct osc_async_page *oap)
+{
+ return (struct osc_page *)container_of(oap, struct osc_page, ops_oap);
+}
+
static inline struct osc_lock *cl2osc_lock(const struct cl_lock_slice *slice)
{
LINVRNT(osc_is_object(&slice->cls_obj->co_lu));
return cl2osc_lock(cl_lock_at(lock, &osc_device_type));
}
+static inline int osc_io_srvlock(struct osc_io *oio)
+{
+ return (oio->oi_lockless && !oio->oi_cl.cis_io->ci_no_srvlock);
+}
+
+enum osc_extent_state {
+ OES_INV = 0, /** extent is just initialized or destroyed */
+ OES_ACTIVE = 1, /** process is using this extent */
+ OES_CACHE = 2, /** extent is ready for IO */
+ OES_LOCKING = 3, /** locking page to prepare IO */
+ OES_LOCK_DONE = 4, /** locking finished, ready to send */
+ OES_RPC = 5, /** in RPC */
+ OES_TRUNC = 6, /** being truncated */
+ OES_STATE_MAX
+};
+
+/**
+ * osc_extent data to manage dirty pages.
+ * osc_extent has the following attributes:
+ * 1. all pages in the same must be in one RPC in write back;
+ * 2. # of pages must be less than max_pages_per_rpc - implied by 1;
+ * 3. must be covered by only 1 osc_lock;
+ * 4. exclusive. It's impossible to have overlapped osc_extent.
+ *
+ * The lifetime of an extent is from when the 1st page is dirtied to when
+ * all pages inside it are written out.
+ *
+ * LOCKING ORDER
+ * =============
+ * page lock -> client_obd_list_lock -> object lock(osc_object::oo_lock)
+ */
+struct osc_extent {
+ /** red-black tree node */
+ struct rb_node oe_node;
+ /** osc_object of this extent */
+ struct osc_object *oe_obj;
+ /** refcount, removed from red-black tree if reaches zero. */
+ atomic_t oe_refc;
+ /** busy if non-zero */
+ atomic_t oe_users;
+ /** link list of osc_object's oo_{hp|urgent|locking}_exts. */
+ struct list_head oe_link;
+ /** state of this extent */
+ unsigned int oe_state;
+ /** flags for this extent. */
+ unsigned int oe_intree:1,
+ /** 0 is write, 1 is read */
+ oe_rw:1,
+ /** sync extent, queued by osc_queue_sync_pages() */
+ oe_sync:1,
+ oe_srvlock:1,
+ oe_memalloc:1,
+ /** an ACTIVE extent is going to be truncated, so when this extent
+ * is released, it will turn into TRUNC state instead of CACHE. */
+ oe_trunc_pending:1,
+ /** this extent should be written asap and someone may wait for the
+ * write to finish. This bit is usually set along with urgent if
+ * the extent was CACHE state.
+ * fsync_wait extent can't be merged because new extent region may
+ * exceed fsync range. */
+ oe_fsync_wait:1,
+ /** covering lock is being canceled */
+ oe_hp:1,
+ /** this extent should be written back asap. set if one of pages is
+ * called by page WB daemon, or sync write or reading requests. */
+ oe_urgent:1;
+ /** how many grants allocated for this extent.
+ * Grant allocated for this extent. There is no grant allocated
+ * for reading extents and sync write extents. */
+ unsigned int oe_grants;
+ /** # of dirty pages in this extent */
+ unsigned int oe_nr_pages;
+ /** list of pending oap pages. Pages in this list are NOT sorted. */
+ struct list_head oe_pages;
+ /** Since an extent has to be written out in atomic, this is used to
+ * remember the next page need to be locked to write this extent out.
+ * Not used right now.
+ */
+ struct osc_page *oe_next_page;
+ /** start and end index of this extent, include start and end
+ * themselves. Page offset here is the page index of osc_pages.
+ * oe_start is used as keyword for red-black tree. */
+ pgoff_t oe_start;
+ pgoff_t oe_end;
+ /** maximum ending index of this extent, this is limited by
+ * max_pages_per_rpc, lock extent and chunk size. */
+ pgoff_t oe_max_end;
+ /** waitqueue - for those who want to be notified if this extent's
+ * state has changed. */
+ wait_queue_head_t oe_waitq;
+ /** lock covering this extent */
+ struct ldlm_lock *oe_dlmlock;
+ /** terminator of this extent. Must be true if this extent is in IO. */
+ struct task_struct *oe_owner;
+ /** return value of writeback. If somebody is waiting for this extent,
+ * this value can be known by outside world. */
+ int oe_rc;
+ /** max pages per rpc when this extent was created */
+ unsigned int oe_mppr;
+};
+
+int osc_extent_finish(const struct lu_env *env, struct osc_extent *ext,
+ int sent, int rc);
+int osc_extent_release(const struct lu_env *env, struct osc_extent *ext);
+
+int osc_lock_discard_pages(const struct lu_env *env, struct osc_object *osc,
+ pgoff_t start, pgoff_t end, enum cl_lock_mode mode);
+
+typedef int (*osc_page_gang_cbt)(const struct lu_env *, struct cl_io *,
+ struct osc_page *, void *);
+int osc_page_gang_lookup(const struct lu_env *env, struct cl_io *io,
+ struct osc_object *osc, pgoff_t start, pgoff_t end,
+ osc_page_gang_cbt cb, void *cbdata);
/** @} osc */
#endif /* OSC_CL_INTERNAL_H */
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