* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2012, 2013, Intel Corporation.
+ * Copyright (c) 2012, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#ifndef LOV_CL_INTERNAL_H
#define LOV_CL_INTERNAL_H
-#ifdef __KERNEL__
-# include <libcfs/libcfs.h>
-#else
-# include <liblustre.h>
-#endif
-
+#include <libcfs/libcfs.h>
#include <obd.h>
#include <cl_object.h>
#include "lov_internal.h"
* - top-page keeps a reference to its sub-page, and destroys it when it
* is destroyed.
*
- * - sub-lock keep a reference to its top-locks. Top-lock keeps a
- * reference (and a hold, see cl_lock_hold()) on its sub-locks when it
- * actively using them (that is, in cl_lock_state::CLS_QUEUING,
- * cl_lock_state::CLS_ENQUEUED, cl_lock_state::CLS_HELD states). When
- * moving into cl_lock_state::CLS_CACHED state, top-lock releases a
- * hold. From this moment top-lock has only a 'weak' reference to its
- * sub-locks. This reference is protected by top-lock
- * cl_lock::cll_guard, and will be automatically cleared by the sub-lock
- * when the latter is destroyed. When a sub-lock is canceled, a
- * reference to it is removed from the top-lock array, and top-lock is
- * moved into CLS_NEW state. It is guaranteed that all sub-locks exist
- * while their top-lock is in CLS_HELD or CLS_CACHED states.
- *
* - IO's are not reference counted.
*
* To implement a connection between top and sub entities, lov layer is split
*
* \see cl_env_get()
*/
- int emrg_refcheck;
+ __u16 emrg_refcheck;
};
struct lov_device {
* When top-object is destroyed (lov_delete_raid0())
* it releases its reference to a sub-object and waits
* until the latter is finally destroyed.
+ *
+ * May be vmalloc'd, must be freed with OBD_FREE_LARGE.
*/
struct lovsub_object **lo_sub;
/**
};
/**
- * Flags that top-lock can set on each of its sub-locks.
- */
-enum lov_sub_flags {
- /** Top-lock acquired a hold (cl_lock_hold()) on a sub-lock. */
- LSF_HELD = 1 << 0
-};
-
-/**
* State lov_lock keeps for each sub-lock.
*/
struct lov_lock_sub {
- /** sub-lock itself */
- struct lovsub_lock *sub_lock;
- /** An array of per-sub-lock flags, taken from enum lov_sub_flags */
- unsigned sub_flags;
- int sub_stripe;
- struct cl_lock_descr sub_descr;
- struct cl_lock_descr sub_got;
+ /** sub-lock itself */
+ struct cl_lock sub_lock;
+ /** Set if the sublock has ever been enqueued, meaning it may
+ * hold resources of underlying layers */
+ unsigned int sub_is_enqueued:1,
+ sub_initialized:1;
+ int sub_stripe;
};
/**
* lov-specific lock state.
*/
struct lov_lock {
- struct cl_lock_slice lls_cl;
- /** Number of sub-locks in this lock */
- int lls_nr;
- /**
- * Number of existing sub-locks.
- */
- unsigned lls_nr_filled;
- /**
- * Set when sub-lock was canceled, while top-lock was being
- * used, or unused.
- */
- unsigned int lls_cancel_race:1,
- lls_ever_canceled:1;
- /**
- * An array of sub-locks
- *
- * There are two issues with managing sub-locks:
- *
- * - sub-locks are concurrently canceled, and
- *
- * - sub-locks are shared with other top-locks.
- *
- * To manage cancellation, top-lock acquires a hold on a sublock
- * (lov_sublock_adopt()) when the latter is inserted into
- * lov_lock::lls_sub[]. This hold is released (lov_sublock_release())
- * when top-lock is going into CLS_CACHED state or destroyed. Hold
- * prevents sub-lock from cancellation.
- *
- * Sub-lock sharing means, among other things, that top-lock that is
- * in the process of creation (i.e., not yet inserted into lock list)
- * is already accessible to other threads once at least one of its
- * sub-locks is created, see lov_lock_sub_init().
- *
- * Sub-lock can be in one of the following states:
- *
- * - doesn't exist, lov_lock::lls_sub[]::sub_lock == NULL. Such
- * sub-lock was either never created (top-lock is in CLS_NEW
- * state), or it was created, then canceled, then destroyed
- * (lov_lock_unlink() cleared sub-lock pointer in the top-lock).
- *
- * - sub-lock exists and is on
- * hold. (lov_lock::lls_sub[]::sub_flags & LSF_HELD). This is a
- * normal state of a sub-lock in CLS_HELD and CLS_CACHED states
- * of a top-lock.
- *
- * - sub-lock exists, but is not held by the top-lock. This
- * happens after top-lock released a hold on sub-locks before
- * going into cache (lov_lock_unuse()).
- *
- * \todo To support wide-striping, array has to be replaced with a set
- * of queues to avoid scanning.
- */
- struct lov_lock_sub *lls_sub;
- /**
- * Original description with which lock was enqueued.
- */
- struct cl_lock_descr lls_orig;
+ struct cl_lock_slice lls_cl;
+ /** Number of sub-locks in this lock */
+ int lls_nr;
+ /** sublock array */
+ struct lov_lock_sub lls_sub[0];
};
struct lov_page {
- struct cl_page_slice lps_cl;
- int lps_invalid;
+ struct cl_page_slice lps_cl;
+ unsigned int lps_stripe; /* stripe index */
};
/*
* A linkage into per sub-lock list of all corresponding top-locks,
* hanging off lovsub_lock::lss_parents.
*/
- cfs_list_t lll_list;
+ struct list_head lll_list;
};
/**
* List of top-locks that have given sub-lock as their part. Protected
* by cl_lock::cll_guard mutex.
*/
- cfs_list_t lss_parents;
+ struct list_head lss_parents;
/**
* Top-lock that initiated current operation on this sub-lock. This is
* only set during top-to-bottom lock operations like enqueue, and is
struct ost_lvb lti_lvb;
struct cl_2queue lti_cl2q;
struct cl_page_list lti_plist;
- struct cl_lock_closure lti_closure;
wait_queue_t lti_waiter;
struct cl_attr lti_attr;
};
* State that lov_io maintains for every sub-io.
*/
struct lov_io_sub {
- int sub_stripe;
- /**
- * sub-io for a stripe. Ideally sub-io's can be stopped and resumed
- * independently, with lov acting as a scheduler to maximize overall
- * throughput.
- */
- struct cl_io *sub_io;
- /**
- * Linkage into a list (hanging off lov_io::lis_active) of all
- * sub-io's active for the current IO iteration.
- */
- cfs_list_t sub_linkage;
- /**
- * true, iff cl_io_init() was successfully executed against
- * lov_io_sub::sub_io.
- */
- int sub_io_initialized;
- /**
- * True, iff lov_io_sub::sub_io and lov_io_sub::sub_env weren't
- * allocated, but borrowed from a per-device emergency pool.
- */
- int sub_borrowed;
- /**
- * environment, in which sub-io executes.
- */
- struct lu_env *sub_env;
- /**
- * environment's refcheck.
- *
- * \see cl_env_get()
- */
- int sub_refcheck;
- int sub_refcheck2;
- int sub_reenter;
- void *sub_cookie;
+ __u16 sub_stripe;
+ /**
+ * environment's refcheck.
+ *
+ * \see cl_env_get()
+ */
+ __u16 sub_refcheck;
+ __u16 sub_reenter;
+ /**
+ * true, iff cl_io_init() was successfully executed against
+ * lov_io_sub::sub_io.
+ */
+ __u16 sub_io_initialized:1,
+ /**
+ * True, iff lov_io_sub::sub_io and lov_io_sub::sub_env weren't
+ * allocated, but borrowed from a per-device emergency pool.
+ */
+ sub_borrowed:1;
+ /**
+ * Linkage into a list (hanging off lov_io::lis_active) of all
+ * sub-io's active for the current IO iteration.
+ */
+ struct list_head sub_linkage;
+ /**
+ * sub-io for a stripe. Ideally sub-io's can be stopped and resumed
+ * independently, with lov acting as a scheduler to maximize overall
+ * throughput.
+ */
+ struct cl_io *sub_io;
+ /**
+ * environment, in which sub-io executes.
+ */
+ struct lu_env *sub_env;
};
/**
* starting position within a file, for the current io loop iteration
* (stripe), used by ci_io_loop().
*/
- obd_off lis_pos;
- /**
- * end position with in a file, for the current stripe io. This is
- * exclusive (i.e., next offset after last byte affected by io).
- */
- obd_off lis_endpos;
+ loff_t lis_pos;
+ /**
+ * end position with in a file, for the current stripe io. This is
+ * exclusive (i.e., next offset after last byte affected by io).
+ */
+ loff_t lis_endpos;
- int lis_mem_frozen;
- int lis_stripe_count;
- int lis_active_subios;
+ int lis_mem_frozen;
+ int lis_stripe_count;
+ int lis_active_subios;
- /**
- * the index of ls_single_subio in ls_subios array
- */
- int lis_single_subio_index;
- struct cl_io lis_single_subio;
+ /**
+ * the index of ls_single_subio in ls_subios array
+ */
+ int lis_single_subio_index;
+ struct cl_io lis_single_subio;
- /**
- * size of ls_subios array, actually the highest stripe #
- */
- int lis_nr_subios;
- struct lov_io_sub *lis_subs;
- /**
- * List of active sub-io's.
- */
- cfs_list_t lis_active;
+ /**
+ * size of ls_subios array, actually the highest stripe #
+ * May be vmalloc'd, must be freed with OBD_FREE_LARGE().
+ */
+ int lis_nr_subios;
+ struct lov_io_sub *lis_subs;
+ /**
+ * List of active sub-io's.
+ */
+ struct list_head lis_active;
};
struct lov_session {
struct lov_sublock_env ls_subenv;
};
-/**
- * State of transfer for lov.
- */
-struct lov_req {
- struct cl_req_slice lr_cl;
-};
-
-/**
- * State of transfer for lovsub.
- */
-struct lovsub_req {
- struct cl_req_slice lsrq_cl;
-};
-
extern struct lu_device_type lov_device_type;
extern struct lu_device_type lovsub_device_type;
extern struct kmem_cache *lov_object_kmem;
extern struct kmem_cache *lov_thread_kmem;
extern struct kmem_cache *lov_session_kmem;
-extern struct kmem_cache *lov_req_kmem;
extern struct kmem_cache *lovsub_lock_kmem;
extern struct kmem_cache *lovsub_object_kmem;
-extern struct kmem_cache *lovsub_req_kmem;
extern struct kmem_cache *lov_lock_link_kmem;
return container_of0(slice, struct lov_page, lps_cl);
}
-static inline struct lov_req *cl2lov_req(const struct cl_req_slice *slice)
-{
- return container_of0(slice, struct lov_req, lr_cl);
-}
-
static inline struct lovsub_page *
cl2lovsub_page(const struct cl_page_slice *slice)
{
return container_of0(slice, struct lovsub_page, lsb_cl);
}
-static inline struct lovsub_req *cl2lovsub_req(const struct cl_req_slice *slice)
-{
- return container_of0(slice, struct lovsub_req, lsrq_cl);
-}
-
static inline struct lov_io *cl2lov_io(const struct lu_env *env,
const struct cl_io_slice *ios)
{
static inline struct lov_layout_raid0 *lov_r0(struct lov_object *lov)
{
LASSERT(lov->lo_type == LLT_RAID0);
- LASSERT(lov->lo_lsm->lsm_wire.lw_magic == LOV_MAGIC ||
- lov->lo_lsm->lsm_wire.lw_magic == LOV_MAGIC_V3);
+ LASSERT(lov->lo_lsm->lsm_magic == LOV_MAGIC ||
+ lov->lo_lsm->lsm_magic == LOV_MAGIC_V3);
return &lov->u.raid0;
}
+/* lov_pack.c */
+int lov_getstripe(struct lov_object *obj, struct lov_stripe_md *lsm,
+ struct lov_user_md __user *lump);
+
/** @} lov */
#endif
-
git://git.whamcloud.com / fs / lustre-release.git / blobdiff