io_nw_xfer.c File Reference

#include "motr/client.h"
#include "motr/client_internal.h"
#include "motr/addb.h"
#include "motr/pg.h"
#include "motr/io.h"
#include "lib/memory.h"
#include "lib/errno.h"
#include "lib/finject.h"
#include "lib/cksum_utils.h"
#include "fid/fid.h"
#include "rpc/rpclib.h"
#include "lib/ext.h"
#include "lib/misc.h"
#include "fop/fom_generic.h"
#include "sns/parity_repair.h"
#include "fd/fd.h"
#include "rpc/item.h"
#include "rpc/rpc_internal.h"
#include "lib/trace.h"

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Macros
#define	M0_TRACE_SUBSYSTEM   M0_TRACE_SUBSYS_CLIENT

Functions
	M0_BOB_DEFINE (M0_INTERNAL, &nwxfer_bobtype, nw_xfer_request)
	M0_BOB_DEFINE (M0_INTERNAL, &tioreq_bobtype, target_ioreq)
static void	to_op_io_map (const struct m0_op *op, struct m0_op_io *ioo)
static void	m0_op_io_to_rpc_map (const struct m0_op_io *ioo, const struct m0_rpc_item *item)
static uint32_t	io_di_size (struct m0_op_io *ioo)
static void	parity_page_pos_get (struct pargrp_iomap *map, m0_bindex_t index, uint32_t *row, uint32_t *col)
static int	dgmode_rwvec_alloc_init (struct target_ioreq *ti)
static void	dgmode_rwvec_dealloc_fini (struct dgmode_rwvec *dg)
static uint64_t	tioreqs_hash_func (const struct m0_htable *htable, const void *k)
static bool	tioreq_key_eq (const void *key1, const void *key2)
	M0_HT_DESCR_DEFINE (tioreqht, "Hash of target_ioreq objects", M0_INTERNAL, struct target_ioreq, ti_link, ti_magic, M0_TIOREQ_MAGIC, M0_TLIST_HEAD_MAGIC, ti_fid.f_container, tioreqs_hash_func, tioreq_key_eq)
	M0_HT_DEFINE (tioreqht, M0_INTERNAL, struct target_ioreq, uint64_t)
static bool	target_ioreq_invariant (const struct target_ioreq *ti)
M0_INTERNAL bool	nw_xfer_request_invariant (const struct nw_xfer_request *xfer)
void	target_ioreq_fini (struct target_ioreq *ti)
void	target_ioreq_cancel (struct target_ioreq *ti)
static struct target_ioreq *	target_ioreq_locate (struct nw_xfer_request *xfer, struct m0_fid *fid)
static bool	should_unit_be_truncated (bool partial, enum m0_pdclust_unit_type unit_type, enum page_attr flags)
static void	target_ioreq_seg_add (struct target_ioreq *ti, const struct m0_pdclust_src_addr *src, const struct m0_pdclust_tgt_addr *tgt, m0_bindex_t gob_offset, m0_bcount_t count, struct pargrp_iomap *map)
M0_INTERNAL struct m0_fid	target_fid (struct m0_op_io *ioo, struct m0_pdclust_tgt_addr *tgt)
static struct m0_rpc_session *	target_session (struct m0_op_io *ioo, struct m0_fid tfid)
static int	bulk_buffer_add (struct ioreq_fop *irfop, struct m0_net_domain *dom, struct m0_rpc_bulk_buf **rbuf, uint32_t *delta, uint32_t maxsize)
static void	irfop_fini (struct ioreq_fop *irfop)
static void *	buf_aux_chk_get (struct m0_bufvec *aux, enum page_attr p_attr, uint32_t seg_idx, bool rd_in_wr)
static int	target_ioreq_iofops_prepare (struct target_ioreq *ti, enum page_attr filter)
static int	target_cob_fop_prepare (struct target_ioreq *ti)
static int	target_ioreq_init (struct target_ioreq *ti, struct nw_xfer_request *xfer, const struct m0_fid *cobfid, uint64_t ta_obj, struct m0_rpc_session *session, uint64_t size)
static int	nw_xfer_tioreq_get (struct nw_xfer_request *xfer, struct m0_fid *fid, uint64_t ta_obj, struct m0_rpc_session *session, uint64_t size, struct target_ioreq **out)
static void	databufs_set_dgw_mode (struct pargrp_iomap *iomap, struct m0_pdclust_layout *play, struct m0_ext *ext)
static void	paritybufs_set_dgw_mode (struct pargrp_iomap *iomap, struct m0_op_io *ioo, uint64_t unit)
static int	nw_xfer_io_distribute (struct nw_xfer_request *xfer)
static void	nw_xfer_req_complete (struct nw_xfer_request *xfer, bool rmw)
static int	nw_xfer_req_dispatch (struct nw_xfer_request *xfer)
static bool	should_spare_be_mapped (struct m0_op_io *ioo, enum m0_pool_nd_state dev_state)
static int	nw_xfer_tioreq_map (struct nw_xfer_request *xfer, const struct m0_pdclust_src_addr *src, struct m0_pdclust_tgt_addr *tgt, struct target_ioreq **tio)
M0_INTERNAL void	nw_xfer_request_init (struct nw_xfer_request *xfer)
M0_INTERNAL void	nw_xfer_request_fini (struct nw_xfer_request *xfer)

Variables
const struct m0_bob_type	nwxfer_bobtype
const struct m0_bob_type	tioreq_bobtype
static const struct target_ioreq_ops	tioreq_ops
static const struct nw_xfer_ops	xfer_ops

Macro Definition Documentation

M0_TRACE_SUBSYSTEM

#define M0_TRACE_SUBSYSTEM   M0_TRACE_SUBSYS_CLIENT

Definition at line 44 of file io_nw_xfer.c.

Function Documentation

buf_aux_chk_get()

static void* buf_aux_chk_get ( struct m0_bufvec *  aux, enum page_attr  p_attr, uint32_t  seg_idx, bool  rd_in_wr  )

static

Helper function which will return the buffer address based on the page attr, fop phase and aux bufvec.

Definition at line 827 of file io_nw_xfer.c.

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bulk_buffer_add()

static int bulk_buffer_add ( struct ioreq_fop *  irfop, struct m0_net_domain *  dom, struct m0_rpc_bulk_buf **  rbuf, uint32_t *  delta, uint32_t  maxsize  )

static

Pair data/parity buffers with the io fop rpc. This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_iofops_prepare

Parameters

irfop	The io fop that needs bulk buffers adding.
dom	The network domain this rpc will be sent in.
rbuf[out]	The rpc bulk buffer that contains the target-iorequest's extents.
delta[out]	The extra space in the fop needed for metadata.
maxsize	Caller provided limit.

Returns

0 for success, -errno otherwise.

Definition at line 760 of file io_nw_xfer.c.

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databufs_set_dgw_mode()

static void databufs_set_dgw_mode ( struct pargrp_iomap *  iomap, struct m0_pdclust_layout *  play, struct m0_ext *  ext  )

static

Sets databufs within a data unit to the degraded write mode. The unit boundary is ensured by the calling code at nw_xfer_io_distribute().

Definition at line 1406 of file io_nw_xfer.c.

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dgmode_rwvec_alloc_init()

static int dgmode_rwvec_alloc_init ( struct target_ioreq *  ti )

static

Allocates an index and buffer vector(in structure dgmode_rwvec) for a degraded mode IO. This is heavily based on m0t1fs/linux_kernel/file.cdgmode_rwvec_alloc_init

Parameters

ti	The target_ioreq fop asking for the allocation.

Returns

0 for success, or -errno.

Definition at line 151 of file io_nw_xfer.c.

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dgmode_rwvec_dealloc_fini()

static void dgmode_rwvec_dealloc_fini ( struct dgmode_rwvec *  dg )

static

Free index and buffer vector stored in structure dgmode_rwvec for a degraded mode IO. This is heavily based on m0t1fs/linux_kernel/file.cdgmode_rwvec_dealloc_fini

Parameters

dg	The dgmode_rwvec to be finalised.

Returns

NULL

Definition at line 244 of file io_nw_xfer.c.

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io_di_size()

static uint32_t io_di_size ( struct m0_op_io *  ioo )

static

Calculate the size needed for per-segment on-wire data integrity. Note: Client leaves its applications to decide how to use locks on objects, so it doesn't manage any lock. But file lock is needed to calculate di size, a file lock is faked here to get di details. Clearly, a more reliable way to get di size is needed.

Parameters

ioo	The IO operation, to find the client instance.

Returns

the size of data integrity data.

Definition at line 98 of file io_nw_xfer.c.

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irfop_fini()

static void irfop_fini ( struct ioreq_fop *  irfop )

static

Finalises an io request fop, (releases bulk buffers). This is heavily based on m0t1fs/linux_kernel/file.cirfop_fini

Parameters

irfop

The io request fop to finalise.

Definition at line 810 of file io_nw_xfer.c.

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M0_BOB_DEFINE() [1/2]

M0_BOB_DEFINE	(	M0_INTERNAL	,
		&	nwxfer_bobtype,
		nw_xfer_request
	)

BOB definitions for the assorted parts of io requests and nwxfer

M0_BOB_DEFINE() [2/2]

M0_BOB_DEFINE	(	M0_INTERNAL	,
		&	tioreq_bobtype,
		target_ioreq
	)

M0_HT_DEFINE()

M0_HT_DEFINE	(	tioreqht	,
		M0_INTERNAL	,
		struct target_ioreq	,
		uint64_t
	)

M0_HT_DESCR_DEFINE()

M0_HT_DESCR_DEFINE	(	tioreqht	,
		"Hash of target_ioreq objects"	,
		M0_INTERNAL	,
		struct target_ioreq	,
		ti_link	,
		ti_magic	,
		M0_TIOREQ_MAGIC	,
		M0_TLIST_HEAD_MAGIC	,
		ti_fid.	f_container,
		tioreqs_hash_func	,
		tioreq_key_eq
	)

m0_op_io_to_rpc_map()

static void m0_op_io_to_rpc_map ( const struct m0_op_io *  ioo, const struct m0_rpc_item *  item  )

static

Definition at line 80 of file io_nw_xfer.c.

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nw_xfer_io_distribute()

static int nw_xfer_io_distribute ( struct nw_xfer_request *  xfer )

static

Distributes file data into target_ioreq objects as required and populates target_ioreq::ti_ivec and target_ioreq::ti_bufvec. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_io_distribute

Parameters

xfer	The network transfer request.

Returns

0 for success, -errno otherwise.

Definition at line 1460 of file io_nw_xfer.c.

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nw_xfer_req_complete()

static void nw_xfer_req_complete ( struct nw_xfer_request *  xfer, bool  rmw  )

static

Completes all the target io requests in a network transfer request. Collects the total number of bytes read/written, and determines the final return code. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_req_complete Call with ioo->ioo_sm.sm_grp locked.

Parameters

xfer	The network transfer request.
rmw	Whether this request was part of a multiple requests (rmw).

XXX morse: there are better ways of determining whether this is a read request

Definition at line 1667 of file io_nw_xfer.c.

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nw_xfer_req_dispatch()

static int nw_xfer_req_dispatch ( struct nw_xfer_request *  xfer )

static

Prepares each target io request in the network transfer requests, and submit the fops. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_req_dispatch

Parameters

xfer	The network transfer request.

Returns

0 for success, -errno otherwise.

Definition at line 1795 of file io_nw_xfer.c.

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nw_xfer_request_fini()

M0_INTERNAL void nw_xfer_request_fini

(

struct nw_xfer_request *

xfer

)

Finalises a network transfer request. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_request_fini

Parameters

xfer[out]

The network transfer request to finalise.

Definition at line 2159 of file io_nw_xfer.c.

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nw_xfer_request_init()

M0_INTERNAL void nw_xfer_request_init

(

struct nw_xfer_request *

xfer

)

Initialises a network transfer request. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_request_init

Parameters

xfer[out]

The network transfer request to initialise.

Definition at line 2130 of file io_nw_xfer.c.

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nw_xfer_request_invariant()

M0_INTERNAL bool nw_xfer_request_invariant

(

const struct nw_xfer_request *

xfer

)

This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_request_invariant

Definition at line 340 of file io_nw_xfer.c.

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nw_xfer_tioreq_get()

static int nw_xfer_tioreq_get ( struct nw_xfer_request *  xfer, struct m0_fid *  fid, uint64_t  ta_obj, struct m0_rpc_session *  session, uint64_t  size, struct target_ioreq **  out  )

static

Retrieves (possibly allocating and initialising) a target io request for the provided network transfer requests. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_tioreq_get

Parameters

xfer	The network transfer.
fid	The cob fid that the request will operate on.
ta_obj	Which object in the global layout the cobfid corresponds to.
session	The session the request will be sent on.
size	The size of the request.
out[out]	The discovered (or allocated) target io request.

Definition at line 1351 of file io_nw_xfer.c.

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nw_xfer_tioreq_map()

static int nw_xfer_tioreq_map ( struct nw_xfer_request *  xfer, const struct m0_pdclust_src_addr *  src, struct m0_pdclust_tgt_addr *  tgt, struct target_ioreq **  tio  )

static

Determines which targets (spare or not) of the io map the network transfer requests should be mapped to. This is heavily based on m0t1fs/linux_kernel/file.cnw_xfer_tioreq_map

Parameters

xfer	The network transfer request.
src	unit address in the parity groups.
tgt[out]	unit address in the target devices.
tio[out]	The retrieved (or allocated) target request.

Returns

0 for success, -errno otherwise.

Definition at line 2027 of file io_nw_xfer.c.

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parity_page_pos_get()

static void parity_page_pos_get ( struct pargrp_iomap *  map, m0_bindex_t  index, uint32_t *  row, uint32_t *  col  )

static

Definition at line 124 of file io_nw_xfer.c.

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paritybufs_set_dgw_mode()

static void paritybufs_set_dgw_mode ( struct pargrp_iomap *  iomap, struct m0_op_io *  ioo, uint64_t  unit  )

static

Sets paritybufs for the parity to the degraded write mode.

Definition at line 1431 of file io_nw_xfer.c.

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should_spare_be_mapped()

static bool should_spare_be_mapped ( struct m0_op_io *  ioo, enum m0_pool_nd_state  dev_state  )

static

should_spare_be_mapped() decides whether given IO request should be redirected to the spare unit device or not.

For normal IO, M0_IN(ioreq_sm_state, (IRS_READING, IRS_WRITING)), such redirection is not needed, with the exception of read IO case when the failed device is in REPAIRED state.

Note: req->ir_sns_state is used only to differentiate between two possible use cases during the degraded mode write.

Here are possible combinations of different parameters on which the decision is made.

Input parameters:

• State of IO request. Sample set {IRS_DEGRADED_READING, IRS_DEGRADED_WRITING}
• State of current device. Sample set {M0_PNDS_SNS_REPAIRING, M0_PNDS_SNS_REPAIRED}
• State of SNS repair process with respect to current global fid. Sample set {SRS_REPAIR_DONE, SRS_REPAIR_NOTDONE}

Degraded read case (IRS_DEGRADED_READING):

1. device_state == M0_PNDS_SNS_REPAIRING

   Not redirected. The extent is assigned to the failed device itself but it is filtered at the level of io_req_fop.

2. device_state == M0_PNDS_SNS_REPAIRED

   Redirected.

Degraded write case (IRS_DEGRADED_WRITING):

1. device_state == M0_PNDS_SNS_REPAIRED

   Redirected.

2. device_state == M0_PNDS_SNS_REPAIRING && req->ir_sns_state == SRS_REPAIR_DONE

   Redirected. Repair is finished for the current global fid.

3. device_state == M0_PNDS_SNS_REPAIRING && req->ir_sns_state == SRS_REPAIR_NOTDONE

   Not redirected. Repair is not finished for this global fid yet. So we just drop all pages directed towards the failed device. The data will be restored by SNS-repair in the due time later.

4. device_state == M0_PNDS_SNS_REPAIRED && req->ir_sns_state == SRS_REPAIR_NOTDONE

   This should not be possible.

Definition at line 2002 of file io_nw_xfer.c.

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should_unit_be_truncated()

static bool should_unit_be_truncated ( bool  partial, enum m0_pdclust_unit_type  unit_type, enum page_attr  flags  )

static

Definition at line 458 of file io_nw_xfer.c.

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target_cob_fop_prepare()

static int target_cob_fop_prepare ( struct target_ioreq *  ti )

static

Definition at line 1173 of file io_nw_xfer.c.

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target_fid()

M0_INTERNAL struct m0_fid target_fid	(	struct m0_op_io *	ioo,
		struct m0_pdclust_tgt_addr *	tgt
	)

This is heavily based on m0t1fs/linux_kernel/file.ctarget_fid().

Definition at line 710 of file io_nw_xfer.c.

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target_ioreq_cancel()

void target_ioreq_cancel

(

struct target_ioreq *

ti

)

Cancel a target_ioreq.

Parameters

ti	The target_ioreq to cancel.

Definition at line 423 of file io_nw_xfer.c.

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target_ioreq_fini()

void target_ioreq_fini

(

struct target_ioreq *

ti

)

This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_fini

Definition at line 364 of file io_nw_xfer.c.

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target_ioreq_init()

static int target_ioreq_init ( struct target_ioreq *  ti, struct nw_xfer_request *  xfer, const struct m0_fid *  cobfid, uint64_t  ta_obj, struct m0_rpc_session *  session, uint64_t  size  )

static

Initialises a target io request. This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_init

Parameters

ti[out]	The target io request to initialise.
xfer	The corresponding network transfer request.
cobfid	The fid of the cob this request will act on.
ta_obj	Which object in the global layout the cobfid corresponds to.
session	The rpc session that should be used to send this request.
size	The size of the request in bytes.

Returns

0 for success, -errno otherwise.

Definition at line 1195 of file io_nw_xfer.c.

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target_ioreq_invariant()

static bool target_ioreq_invariant ( const struct target_ioreq *  ti )

static

Checks a target_ioreq struct is correct. This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_invariant

Parameters

ti	The target_ioreq fop to check.

Returns

true or false.

Definition at line 324 of file io_nw_xfer.c.

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target_ioreq_iofops_prepare()

static int target_ioreq_iofops_prepare ( struct target_ioreq *  ti, enum page_attr  filter  )

static

Assembles io fops for the specified target server. This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_iofops_prepare

Parameters

ti	The target io request whose data/parity fops should be assembled.
filter	Whether to restrict the set of fops to prepare.

Returns

0 for success, -errno otherwise.

Definition at line 843 of file io_nw_xfer.c.

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target_ioreq_locate()

static struct target_ioreq* target_ioreq_locate ( struct nw_xfer_request *  xfer, struct m0_fid *  fid  )

static

This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_locate

Definition at line 435 of file io_nw_xfer.c.

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target_ioreq_seg_add()

static void target_ioreq_seg_add ( struct target_ioreq *  ti, const struct m0_pdclust_src_addr *  src, const struct m0_pdclust_tgt_addr *  tgt, m0_bindex_t  gob_offset, m0_bcount_t  count, struct pargrp_iomap *  map  )

static

Adds an io segment to index vector and buffer vector in target_ioreq structure. This is heavily based on m0t1fs/linux_kernel/file.ctarget_ioreq_seg_add

Parameters

ti	The target io request.
src	Where in the global file the io occurs.
tgt	Where in the target servers 'tile' the io occurs.
gob_offset	Offset in the global file.
count	Number of bytes in this operation.
map	Map of data/parity buffers, used to tie ti to the corresponding buffers.

CKSUM_TODO: Need to handle degraded write cksum update

Ignore hole because of data size not alligned pool width

Storing the values of goff(checksum offset) into the goff_ivec according to target offset. This creates a mapping between target offset and cheksum offset.

This mapping will be used when we get read reply FOP to locae the checksum in application provided buffer

Definition at line 479 of file io_nw_xfer.c.

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target_session()

static struct m0_rpc_session* target_session ( struct m0_op_io *  ioo, struct m0_fid  tfid  )

inlinestatic

Finds the rpc session to use to contact the server hosting a particular target:fid (cob). This is heavily based on m0t1fs/linux_kernel/file.ctarget_session

Parameters

ioo	The IO operation.
tfid	The cob fid to look for.
a	pointer to the rpc_session to use to contact this target.

Definition at line 731 of file io_nw_xfer.c.

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tioreq_key_eq()

static bool tioreq_key_eq ( const void *  key1, const void *  key2  )

static

Compares keys for target-io requets. This is heavily based on m0t1fs/linux_kernel/file.ctioreq_key_eq.

Parameters

key1	The key of the first target-io request.
key2	The key of the second target-io request.

Returns

true or false.

Definition at line 299 of file io_nw_xfer.c.

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tioreqs_hash_func()

static uint64_t tioreqs_hash_func ( const struct m0_htable *  htable, const void *  k  )

static

Generates a hash for a target-io request. This is heavily based on m0t1fs/linux_kernel/file.ctioreqs_hash_func.

Parameters

htable	The hash table in use.
k	Pointer to the key of the entry to hash.

Returns

the hash key.

Definition at line 279 of file io_nw_xfer.c.

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to_op_io_map()

static void to_op_io_map ( const struct m0_op *  op, struct m0_op_io *  ioo  )

static

Definition at line 70 of file io_nw_xfer.c.

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Variable Documentation

nwxfer_bobtype

const struct m0_bob_type nwxfer_bobtype

Initial value:

= {
        .bt_name         = "nw_xfer_request_bobtype",
        .bt_magix_offset = offsetof(struct nw_xfer_request, nxr_magic),
        .bt_magix        = M0_NWREQ_MAGIC,
        .bt_check        = NULL,
}

BOB types for the assorted parts of io requests and nwxfer

BOB initialisation for the assorted parts of io requests and nwxfer

Definition at line 48 of file io_nw_xfer.c.

tioreq_bobtype

const struct m0_bob_type tioreq_bobtype

Initial value:

= {
        .bt_name         = "target_ioreq",
        .bt_magix_offset = offsetof(struct target_ioreq, ti_magic),
        .bt_magix        = M0_TIOREQ_MAGIC,
        .bt_check        = NULL,
}

Definition at line 49 of file io_nw_xfer.c.

tioreq_ops

const struct target_ioreq_ops tioreq_ops

static

Initial value:

= {
        .tio_seg_add         = target_ioreq_seg_add,
        .tio_iofops_prepare  = target_ioreq_iofops_prepare,
        .tio_cc_fops_prepare = target_cob_fop_prepare,
}

Definition at line 1167 of file io_nw_xfer.c.

xfer_ops

const struct nw_xfer_ops xfer_ops

static

Initial value:

= {
        .nxo_distribute = nw_xfer_io_distribute,
        .nxo_complete   = nw_xfer_req_complete,
        .nxo_dispatch   = nw_xfer_req_dispatch,
        .nxo_tioreq_map = nw_xfer_tioreq_map,
}

Definition at line 2123 of file io_nw_xfer.c.