*
* 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.
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2012, 2015, Intel Corporation.
+ * Copyright (c) 2012, 2016, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Upper half.
*/
-/**
- * Resources that are used in memory-cleaning path, and whose allocation
- * cannot fail even when memory is tight. They are preallocated in sufficient
- * quantities in lov_device::ld_emerg[], and access to them is serialized
- * lov_device::ld_mutex.
- */
-struct lov_device_emerg {
- /**
- * Page list used to submit IO when memory is in pressure.
- */
- struct cl_page_list emrg_page_list;
- /**
- * sub-io's shared by all threads accessing this device when memory is
- * too low to allocate sub-io's dynamically.
- */
- struct cl_io emrg_subio;
- /**
- * Environments used by sub-io's in
- * lov_device_emerg::emrg_subio.
- */
- struct lu_env *emrg_env;
- /**
- * Refchecks for lov_device_emerg::emrg_env.
- *
- * \see cl_env_get()
- */
- int emrg_refcheck;
-};
-
struct lov_device {
/*
* XXX Locking of lov-private data is missing.
__u32 ld_target_nr;
struct lovsub_device **ld_target;
__u32 ld_flags;
-
- /** Emergency resources used in memory-cleansing paths. */
- struct lov_device_emerg **ld_emrg;
- /**
- * Serializes access to lov_device::ld_emrg in low-memory
- * conditions.
- */
- struct mutex ld_mutex;
};
/**
* 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;
/**
struct lovsub_device {
struct cl_device acid_cl;
- struct lov_device *acid_super;
- int acid_idx;
struct cl_device *acid_next;
};
};
/**
- * A link between a top-lock and a sub-lock. Separate data-structure is
- * necessary, because top-locks and sub-locks are in M:N relationship.
- *
- * \todo This can be optimized for a (by far) most frequent case of a single
- * top-lock per sub-lock.
- */
-struct lov_lock_link {
- struct lov_lock *lll_super;
- /** An index within parent lock. */
- int lll_idx;
- /**
- * A linkage into per sub-lock list of all corresponding top-locks,
- * hanging off lovsub_lock::lss_parents.
- */
- struct list_head lll_list;
-};
-
-/**
* Lock state at lovsub layer.
*/
struct lovsub_lock {
struct cl_lock_slice lss_cl;
- /**
- * List of top-locks that have given sub-lock as their part. Protected
- * by cl_lock::cll_guard mutex.
- */
- 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
- * used to optimize state change notification. Protected by
- * cl_lock::cll_guard mutex.
- *
- * \see lovsub_lock_state_one().
- */
- struct cl_lock *lss_active;
};
/**
struct lov_sublock_env {
const struct lu_env *lse_env;
struct cl_io *lse_io;
- struct lov_io_sub *lse_sub;
};
struct lovsub_page {
struct lov_thread_info {
struct cl_object_conf lti_stripe_conf;
struct lu_fid lti_fid;
- struct cl_lock_descr lti_ldescr;
struct ost_lvb lti_lvb;
struct cl_2queue lti_cl2q;
struct cl_page_list lti_plist;
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.
- */
+ __u16 sub_stripe;
+ /**
+ * environment's refcheck.
+ *
+ * \see cl_env_get()
+ */
+ __u16 sub_refcheck;
+ /**
+ * 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;
- /**
- * 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;
+ /**
+ * 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;
};
/**
* (stripe), used by ci_io_loop().
*/
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).
- */
+ /**
+ * 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_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.
- */
+ /**
+ * 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;
};
extern struct kmem_cache *lovsub_lock_kmem;
extern struct kmem_cache *lovsub_object_kmem;
-extern struct kmem_cache *lov_lock_link_kmem;
-
int lov_object_init (const struct lu_env *env, struct lu_object *obj,
const struct lu_object_conf *conf);
int lovsub_object_init (const struct lu_env *env, struct lu_object *obj,
struct cl_io *io);
int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io);
-void lov_lock_unlink (const struct lu_env *env, struct lov_lock_link *link,
- struct lovsub_lock *sub);
struct lov_io_sub *lov_sub_get(const struct lu_env *env, struct lov_io *lio,
int stripe);
-void lov_sub_put (struct lov_io_sub *sub);
-int lov_sublock_modify (const struct lu_env *env, struct lov_lock *lov,
- struct lovsub_lock *sublock,
- const struct cl_lock_descr *d, int idx);
-
int lov_page_init (const struct lu_env *env, struct cl_object *ob,
struct cl_page *page, pgoff_t index);
const struct lu_object_header *hdr,
struct lu_device *dev);
-struct lov_lock_link *lov_lock_link_find(const struct lu_env *env,
- struct lov_lock *lck,
- struct lovsub_lock *sub);
-struct lov_io_sub *lov_page_subio (const struct lu_env *env,
- struct lov_io *lio,
- const struct cl_page_slice *slice);
-
struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov);
int lov_page_stripe(const struct cl_page *page);