* 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()
- */
- __u16 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;
};
/**
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;
};
/**
* \see cl_env_get()
*/
__u16 sub_refcheck;
- __u16 sub_reenter;
/**
* true, iff cl_io_init() was successfully executed against
* lov_io_sub::sub_io.
*/
loff_t lis_endpos;
- int lis_mem_frozen;
int lis_stripe_count;
int lis_active_subios;
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);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff