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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* 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
#include "../../include/linux/libcfs/libcfs.h"
#include "../include/obd.h"
/* osc_build_res_name() */
#include "../include/cl_object.h"
#include "../include/lclient.h"
#include "osc_internal.h"
/** \defgroup osc osc
* @{
*/
struct osc_extent;
/**
* State maintained by osc layer for each IO context.
*/
struct osc_io {
/** super class */
struct cl_io_slice oi_cl;
/** true if this io is lockless. */
int oi_lockless;
/** 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;
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;
};
/**
* State of transfer for osc.
*/
struct osc_req {
struct cl_req_slice or_cl;
};
/**
* State maintained by osc layer for the duration of a system call.
*/
struct osc_session {
struct osc_io os_io;
};
#define OTI_PVEC_SIZE 64
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_page_list oti_plist;
struct cl_io oti_io;
struct cl_page *oti_pvec[OTI_PVEC_SIZE];
};
struct osc_object {
struct cl_object oo_cl;
struct lov_oinfo *oo_oinfo;
/**
* True if locking against this stripe got -EUSERS.
*/
int oo_contended;
unsigned long oo_contention_time;
/**
* List of pages in transfer.
*/
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;
/**
* 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;
};
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.
*/
enum osc_lock_state {
OLS_NEW,
OLS_ENQUEUED,
OLS_UPCALL_RECEIVED,
OLS_GRANTED,
OLS_RELEASED,
OLS_BLOCKED,
OLS_CANCELLED
};
/**
* osc-private state of cl_lock.
*
* 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.
*
* This pointer is protected through a reference, acquired by
* osc_lock_upcall0(). Also, an additional reference is acquired by
* ldlm_lock_addref() call protecting the lock from cancellation, until
* osc_lock_unuse() releases it.
*
* Below is a description of how lock references are acquired and released
* inside of DLM.
*
* - When new lock is created and enqueued to the server (ldlm_cli_enqueue())
* - ldlm_lock_create()
* - ldlm_lock_new(): initializes a lock with 2 references. One for
* the caller (released when reply from the server is received, or on
* error), and another for the hash table.
* - ldlm_lock_addref_internal(): protects the lock from cancellation.
*
* - When reply is received from the server (osc_enqueue_interpret())
* - ldlm_cli_enqueue_fini()
* - LDLM_LOCK_PUT(): releases caller reference acquired by
* ldlm_lock_new().
* - if (rc != 0)
* ldlm_lock_decref(): error case: matches ldlm_cli_enqueue().
* - ldlm_lock_decref(): for async locks, matches ldlm_cli_enqueue().
*
* - When lock is being cancelled (ldlm_lock_cancel())
* - ldlm_lock_destroy()
* - LDLM_LOCK_PUT(): releases hash-table reference acquired by
* ldlm_lock_new().
*
* osc_lock is detached from ldlm_lock by osc_lock_detach() that is called
* either when lock is cancelled (osc_lock_blocking()), or when locks is
* deleted without cancellation (e.g., from cl_locks_prune()). In the latter
* case ldlm lock remains in memory, and can be re-attached to osc_lock in the
* 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 */
__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;
/**
* How many pages are using this lock for io, currently only used by
* read-ahead. If non-zero, the underlying dlm lock won't be cancelled
* during recovery to avoid deadlock. see bz16774.
*
* \see osc_page::ops_lock
* \see osc_page_addref_lock(), osc_page_putref_lock()
*/
atomic_t ols_pageref;
/**
* true, if ldlm_lock_addref() was called against
* osc_lock::ols_lock. This is used for sanity checking.
*
* \see osc_lock::ols_has_ref
*/
unsigned ols_hold :1,
/**
* this is much like osc_lock::ols_hold, except that this bit is
* cleared _after_ reference in released in osc_lock_unuse(). This
* fine distinction is needed because:
*
* - if ldlm lock still has a reference, osc_ast_data_get() needs
* to return associated cl_lock (so that a flag is needed that is
* cleared after ldlm_lock_decref() returned), and
*
* - ldlm_lock_decref() can invoke blocking ast (for a
* LDLM_FL_CBPENDING lock), and osc_lock functions like
* osc_lock_cancel() called from there need to know whether to
* release lock reference (so that a flag is needed that is
* cleared before ldlm_lock_decref() is called).
*/
ols_has_ref:1,
/**
* inherit the lockless attribute from top level cl_io.
* If true, osc_lock_enqueue is able to tolerate the -EUSERS error.
*/
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 tolerable, this will make upper logic happy
* to wait all glimpse locks to each OSTs to be completed.
* Glimpse lock converts to normal lock if the server lock is
* granted.
* Glimpse lock should be destroyed immediately after use.
*/
ols_glimpse:1,
/**
* For async glimpse lock.
*/
ols_agl:1;
/**
* IO that owns this lock. This field is used for a dead-lock
* avoidance by osc_lock_enqueue_wait().
*
* XXX: unfortunately, the owner of a osc_lock is not unique,
* the lock may have multiple users, if the lock is granted and
* then matched.
*/
struct osc_io *ols_owner;
};
/**
* Page state private for osc layer.
*/
struct osc_page {
struct cl_page_slice ops_cl;
/**
* Page queues used by osc to detect when RPC can be formed.
*/
struct osc_async_page ops_oap;
/**
* An offset within page from which next transfer starts. This is used
* by cl_page_clip() to submit partial page transfers.
*/
int ops_from;
/**
* An offset within page at which next transfer ends.
*
* \see osc_page::ops_from.
*/
int ops_to;
/**
* Boolean, true iff page is under transfer. Used for sanity checking.
*/
unsigned ops_transfer_pinned:1,
/**
* True for a `temporary page' created by read-ahead code, probably
* outside of any DLM lock.
*/
ops_temp:1,
/**
* in LRU?
*/
ops_in_lru:1,
/**
* Set if the page must be transferred with OBD_BRW_SRVLOCK.
*/
ops_srvlock:1;
union {
/**
* lru page list. ops_inflight and ops_lru are exclusive so
* that they can share the same data.
*/
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.
*/
unsigned long ops_submit_time;
/**
* A lock of which we hold a reference covers this page. Only used by
* read-ahead: for a readahead page, we hold it's covering lock to
* prevent it from being canceled during recovery.
*
* \see osc_lock::ols_pageref
* \see osc_page_addref_lock(), osc_page_putref_lock().
*/
struct cl_lock *ops_lock;
};
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;
extern struct lu_context_key osc_session_key;
#define OSC_FLAGS (ASYNC_URGENT|ASYNC_READY)
int osc_lock_init(const struct lu_env *env,
struct cl_object *obj, struct cl_lock *lock,
const struct cl_io *io);
int osc_io_init (const struct lu_env *env,
struct cl_object *obj, struct cl_io *io);
int osc_req_init (const struct lu_env *env, struct cl_device *dev,
struct cl_req *req);
struct lu_object *osc_object_alloc(const struct lu_env *env,
const struct lu_object_header *hdr,
struct lu_device *dev);
int osc_page_init(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, struct page *vmpage);
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_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,
u32 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_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);
void osc_object_set_contended (struct osc_object *obj);
void osc_object_clear_contended(struct osc_object *obj);
int osc_object_is_contended (struct osc_object *obj);
int osc_lock_is_lockless (const struct osc_lock *olck);
/*****************************************************************************
*
* Accessors.
*
*/
static inline struct osc_thread_info *osc_env_info(const struct lu_env *env)
{
struct osc_thread_info *info;
info = lu_context_key_get(&env->le_ctx, &osc_key);
LASSERT(info != NULL);
return info;
}
static inline struct osc_session *osc_env_session(const struct lu_env *env)
{
struct osc_session *ses;
ses = lu_context_key_get(env->le_ses, &osc_session_key);
LASSERT(ses != NULL);
return ses;
}
static inline struct osc_io *osc_env_io(const struct lu_env *env)
{
return &osc_env_session(env)->os_io;
}
static inline int osc_is_object(const struct lu_object *obj)
{
return obj->lo_dev->ld_type == &osc_device_type;
}
static inline struct osc_device *lu2osc_dev(const struct lu_device *d)
{
LINVRNT(d->ld_type == &osc_device_type);
return container_of0(d, struct osc_device, od_cl.cd_lu_dev);
}
static inline struct obd_export *osc_export(const 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 || 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 || 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)
{
LINVRNT(osc_is_object(&slice->cpl_obj->co_lu));
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 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 container_of0(slice, struct osc_lock, ols_cl);
}
static inline struct osc_lock *osc_lock_at(const struct cl_lock *lock)
{
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,
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 cl_lock *oe_osclock;
/** 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);
void osc_extent_release(const struct lu_env *env, struct osc_extent *ext);
/** @} osc */
#endif /* OSC_CL_INTERNAL_H */
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