I/O Service Operations

Data Structures
struct	m0_rios_buffer_pool
struct	m0_reqh_io_service
struct	m0_ios_mds_conn
struct	m0_ios_mds_conn_map

Macros
#define	M0_BYTECOUNT_USER_ID   8881212

Enumerations
enum	{ M0T1FS_MAX_NR_MDS = 1024 }

Functions
M0_INTERNAL int	m0_ios_register (void)
M0_INTERNAL void	m0_ios_unregister (void)
M0_INTERNAL bool	m0_reqh_io_service_invariant (const struct m0_reqh_io_service *rios)
M0_INTERNAL void	m0_ios_cdom_get (struct m0_reqh *reqh, struct m0_cob_domain **out)
M0_INTERNAL void	m0_ios_cdom_fini (struct m0_reqh *reqh)
M0_INTERNAL void	m0_ios_mds_conn_fini (struct m0_reqh *reqh)
M0_INTERNAL int	m0_ios_mds_getattr (struct m0_reqh *reqh, const struct m0_fid *gfid, struct m0_cob_attr *attr)
M0_INTERNAL int	m0_ios_getattr (struct m0_reqh *reqh, const struct m0_fid *gfid, uint64_t index, struct m0_cob_attr *attr)
M0_INTERNAL int	m0_ios_mds_getattr_async (struct m0_reqh *reqh, const struct m0_fid *gfid, struct m0_cob_attr *attr, void(*cb)(void *arg, int rc), void *arg)
M0_INTERNAL int	m0_ios_getattr_async (struct m0_reqh *reqh, const struct m0_fid *gfid, struct m0_cob_attr *attr, uint64_t index, void(*cb)(void *arg, int rc), void *arg)
M0_INTERNAL int	m0_ios_cob_getattr_async (const struct m0_fid *gfid, struct m0_cob_attr *attr, uint64_t cob_idx, struct m0_pool_version *pv, void(*cb)(void *arg, int rc), void *arg)
M0_INTERNAL void	m0_ios_net_buffer_pool_size_set (uint32_t buffer_pool_size)

Detailed Description

See also

DLD of Bulk Server

Request handler

I/O Service initialization and operations controlled by request handler.

I/O Service defines service type operation vector -

• I/O Service type operation m0_ioservice_alloc_and_init()
  Request handler uses this service type operation to allocate and and initiate service instance.

I/O Service defines service operation vector -

• I/O Service operation m0_ioservice_start()
  Initiate buffer_pool and register I/O FOP with service
• I/O Service operation m0_ioservice_stop()
  Free buffer_pool and unregister I/O FOP with service
• I/O Service operation m0_ioservice_fini)
  Free I/O Service instance.

State transition diagram for I/O Service will be available at Request handler

Macro Definition Documentation

M0_BYTECOUNT_USER_ID

#define M0_BYTECOUNT_USER_ID   8881212

Temporary hard coded user id to be used for bytecount btree key

Definition at line 72 of file io_service.h.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
M0T1FS_MAX_NR_MDS

Definition at line 136 of file io_service.h.

Function Documentation

m0_ios_cdom_fini()

M0_INTERNAL void m0_ios_cdom_fini

(

struct m0_reqh *

reqh

)

Definition at line 474 of file io_service.c.

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m0_ios_cdom_get()

M0_INTERNAL void m0_ios_cdom_get	(	struct m0_reqh *	reqh,
		struct m0_cob_domain **	out
	)

Todo:

: This function is used by copy machine module, but not used by IO service. Corresponding ticket: MOTR-1190.

Definition at line 463 of file io_service.c.

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m0_ios_cob_getattr_async()

M0_INTERNAL int m0_ios_cob_getattr_async	(	const struct m0_fid *	gfid,
		struct m0_cob_attr *	attr,
		uint64_t	cob_idx,
		struct m0_pool_version *	pv,
		void(*)(void *arg, int rc)	cb,
		void *	arg
	)

Definition at line 891 of file io_service.c.

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m0_ios_getattr()

M0_INTERNAL int m0_ios_getattr	(	struct m0_reqh *	reqh,
		const struct m0_fid *	gfid,
		uint64_t	index,
		struct m0_cob_attr *	attr
	)

Getattr of file from ioservice synchronously.

Definition at line 814 of file io_service.c.

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m0_ios_getattr_async()

M0_INTERNAL int m0_ios_getattr_async	(	struct m0_reqh *	reqh,
		const struct m0_fid *	gfid,
		struct m0_cob_attr *	attr,
		uint64_t	index,
		void(*)(void *arg, int rc)	cb,
		void *	arg
	)

getattr from ioservice asynchronously.

Definition at line 916 of file io_service.c.

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m0_ios_mds_conn_fini()

M0_INTERNAL void m0_ios_mds_conn_fini

(

struct m0_reqh *

reqh

)

Terminates and clears the ioservice to mdservice connection.

Definition at line 617 of file io_service.c.

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m0_ios_mds_getattr()

M0_INTERNAL int m0_ios_mds_getattr	(	struct m0_reqh *	reqh,
		const struct m0_fid *	gfid,
		struct m0_cob_attr *	attr
	)

Gets file attributes from mdservice.

Parameters

reqh	the request handler.
gfid	the global fid of the file.
attr	the returned attributes will be stored here.

Note

This is a block operation in service. m0_fom_block_enter()/m0_fom_block_leave() must be used to notify fom.

Definition at line 663 of file io_service.c.

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m0_ios_mds_getattr_async()

M0_INTERNAL int m0_ios_mds_getattr_async	(	struct m0_reqh *	reqh,
		const struct m0_fid *	gfid,
		struct m0_cob_attr *	attr,
		void(*)(void *arg, int rc)	cb,
		void *	arg
	)

getattr from mdservice asynchronously.

Definition at line 940 of file io_service.c.

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m0_ios_net_buffer_pool_size_set()

M0_INTERNAL void m0_ios_net_buffer_pool_size_set

(

uint32_t

buffer_pool_size

)

Sets default values for buf_nr for m0_net_buffer_pool_provision() in ioservice.

Note

It sets a static variable, so this change is persistent across m0_init()/m0_fini().

See also

ios_net_buffer_pool_size

Definition at line 994 of file io_service.c.

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m0_ios_register()

M0_INTERNAL int m0_ios_register

(

void

)

Registers I/O service with motr node. Motr setup calls this function.

Definition at line 158 of file io_service.c.

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m0_ios_unregister()

M0_INTERNAL void m0_ios_unregister

(

void

)

Unregisters I/O service from motr node.

Definition at line 174 of file io_service.c.

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m0_reqh_io_service_invariant()

M0_INTERNAL bool m0_reqh_io_service_invariant

(

const struct m0_reqh_io_service *

rios

)

Definition at line 183 of file io_service.c.

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