Viewing: lustre_net.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2010, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* PortalRPC is the layer used by rest of lustre code to achieve network
* communications: establish connections with corresponding export and import
* states, listen for a service, send and receive RPCs.
* PortalRPC also includes base recovery framework: packet resending and
* replaying, reconnections, pinger.
*
* PortalRPC utilizes LNet as its transport layer.
*/
#ifndef _LUSTRE_NET_H
#define _LUSTRE_NET_H
/** \defgroup net net
*
* @{
*/
#include <linux/kobject.h>
#include <linux/rhashtable.h>
#include <linux/uio.h>
#include <linux/pm_qos.h>
#include <linux/lnet/api.h>
#include <linux/lnet/lib-types.h>
#include <uapi/linux/lnet/nidstr.h>
#include <uapi/linux/lustre/lustre_idl.h>
#include <lustre_ha.h>
#include <lustre_sec.h>
#include <lustre_import.h>
#include <lprocfs_status.h>
#include <lu_object.h>
#include <lustre_req_layout.h>
#include <obd_support.h>
#include <uapi/linux/lustre/lustre_ver.h>
/* MD flags we _always_ use */
#define PTLRPC_MD_OPTIONS 0
/**
* log2 max # of bulk operations in one request: 2=4MB/RPC, 5=32MB/RPC, ...
* In order for the client and server to properly negotiate the maximum
* possible transfer size, PTLRPC_BULK_OPS_COUNT must be a power-of-two
* value. The client is free to limit the actual RPC size for any bulk
* transfer via cl_max_pages_per_rpc to some non-power-of-two value.
* NOTE: This is limited to 16 (=64GB RPCs) by IOOBJ_MAX_BRW_BITS.
*/
#define PTLRPC_BULK_OPS_BITS 6
#if PTLRPC_BULK_OPS_BITS > 16
#error "More than 65536 BRW RPCs not allowed by IOOBJ_MAX_BRW_BITS."
#endif
/**
* PTLRPC_BULK_OPS_COUNT is a protocol maximum and must be a power of 2
* However PTLRPC_BULK_OPS_LIMIT (ops_count/2 +1) is enforced as the
* 64G with alignment interop limit.
*/
#define PTLRPC_BULK_OPS_COUNT (1U << (PTLRPC_BULK_OPS_BITS + 1))
/**
* PTLRPC_BULK_OPS_MASK is for the convenience of the client only, and
* should not be used on the server at all. Otherwise, it imposes a
* protocol limitation on the maximum RPC size that can be used by any
* RPC sent to that server in the future. Instead, the server should
* use the negotiated per-client ocd_brw_size to determine the bulk
* RPC count.
*/
#define PTLRPC_BULK_OPS_MASK (~((__u64)PTLRPC_BULK_OPS_COUNT - 1))
#define PTLRPC_BULK_INTEROP_PAGE_SIZE 4096
/**
* Define maxima for bulk I/O.
*
* A single PTLRPC BRW request is sent via up to PTLRPC_BULK_OPS_COUNT
* of LNET_MTU sized RDMA transfers. Clients and servers negotiate the
* currently supported maximum between peers at connect via ocd_brw_size.
*/
#define PTLRPC_MAX_BRW_BITS (LNET_MTU_BITS + PTLRPC_BULK_OPS_BITS)
#define PTLRPC_MAX_BRW_SIZE (1U << PTLRPC_MAX_BRW_BITS)
#define PTLRPC_MAX_BRW_PAGES (PTLRPC_MAX_BRW_SIZE >> PAGE_SHIFT)
#define ONE_MB_BRW_SIZE (1U << LNET_MTU_BITS)
#define MD_MAX_BRW_SIZE (1U << LNET_MTU_BITS)
#define MD_MAX_BRW_PAGES (MD_MAX_BRW_SIZE >> PAGE_SHIFT)
#define DT_MAX_BRW_SIZE PTLRPC_MAX_BRW_SIZE
#define DT_DEF_BRW_SIZE (4 * ONE_MB_BRW_SIZE)
#define DT_MAX_BRW_PAGES (DT_MAX_BRW_SIZE >> PAGE_SHIFT)
#define OFD_MAX_BRW_SIZE (1U << LNET_MTU_BITS)
/* unaligned dio needs an extra md vector 65 instead of 64 */
#define PTLRPC_BULK_OPS_LIMIT ((1U << PTLRPC_BULK_OPS_BITS) + 1)
/* When PAGE_SIZE is a constant, we can check our arithmetic here with cpp! */
#if ((PTLRPC_MAX_BRW_PAGES & (PTLRPC_MAX_BRW_PAGES - 1)) != 0)
# error "PTLRPC_MAX_BRW_PAGES isn't a power of two"
#endif
#if (PTLRPC_MAX_BRW_SIZE != (PTLRPC_MAX_BRW_PAGES * PAGE_SIZE))
# error "PTLRPC_MAX_BRW_SIZE isn't PTLRPC_MAX_BRW_PAGES * PAGE_SIZE"
#endif
#if (PTLRPC_MAX_BRW_SIZE > LNET_MTU * PTLRPC_BULK_OPS_COUNT)
# error "PTLRPC_MAX_BRW_SIZE too big"
#endif
#if (PTLRPC_MAX_BRW_PAGES > LNET_MAX_IOV * PTLRPC_BULK_OPS_COUNT)
# error "PTLRPC_MAX_BRW_PAGES too big"
#endif
#if (PTLRPC_BULK_OPS_LIMIT > PTLRPC_BULK_OPS_COUNT)
# error "PTLRPC_BULK_OPS_LIMIT too big"
#endif
#define PTLRPC_NTHRS_INIT 2
/**
* Buffer Constants
*
* Constants determine how memory is used to buffer incoming service requests.
*
* ?_NBUFS # buffers to allocate when growing the pool
* ?_BUFSIZE # bytes in a single request buffer
* ?_MAXREQSIZE # maximum request service will receive
*
* When fewer than ?_NBUFS/2 buffers are posted for receive, another chunk
* of ?_NBUFS is added to the pool.
*
* Messages larger than ?_MAXREQSIZE are dropped. Request buffers are
* considered full when less than ?_MAXREQSIZE is left in them.
*/
/**
* Thread Constants
*
* Constants determine how threads are created for ptlrpc service.
*
* ?_NTHRS_INIT # threads to create for each service partition on
* initializing. If it's non-affinity service and
* there is only one partition, it's the overall #
* threads for the service while initializing.
* ?_NTHRS_BASE # threads should be created at least for each
* ptlrpc partition to keep the service healthy.
* It's the low-water mark of threads upper-limit
* for each partition.
* ?_THR_FACTOR # threads can be added on threads upper-limit for
* each CPU core. This factor is only for reference,
* we might decrease value of factor if number of cores
* per CPT is above a limit.
* ?_NTHRS_MAX # overall threads can be created for a service,
* it's a soft limit because if service is running
* on machine with hundreds of cores and tens of
* CPU partitions, we need to guarantee each partition
* has ?_NTHRS_BASE threads, which means total threads
* will be ?_NTHRS_BASE * number_of_cpts which can
* exceed ?_NTHRS_MAX.
*
* Examples
*
* #define MDS_NTHRS_INIT 2
* #define MDS_NTHRS_BASE 64
* #define MDS_NTHRS_FACTOR 8
* #define MDS_NTHRS_MAX 1024
*
* Example 1):
* ---------------------------------------------------------------------
* Server(A) has 16 cores, user configured it to 4 partitions so each
* partition has 4 cores, then actual number of service threads on each
* partition is:
* MDS_NTHRS_BASE(64) + cores(4) * MDS_NTHRS_FACTOR(8) = 96
*
* Total number of threads for the service is:
* 96 * partitions(4) = 384
*
* Example 2):
* ---------------------------------------------------------------------
* Server(B) has 32 cores, user configured it to 4 partitions so each
* partition has 8 cores, then actual number of service threads on each
* partition is:
* MDS_NTHRS_BASE(64) + cores(8) * MDS_NTHRS_FACTOR(8) = 128
*
* Total number of threads for the service is:
* 128 * partitions(4) = 512
*
* Example 3):
* ---------------------------------------------------------------------
* Server(B) has 96 cores, user configured it to 8 partitions so each
* partition has 12 cores, then actual number of service threads on each
* partition is:
* MDS_NTHRS_BASE(64) + cores(12) * MDS_NTHRS_FACTOR(8) = 160
*
* Total number of threads for the service is:
* 160 * partitions(8) = 1280
*
* However, it's above the soft limit MDS_NTHRS_MAX, so we choose this number
* as upper limit of threads number for each partition:
* MDS_NTHRS_MAX(1024) / partitions(8) = 128
*
* Example 4):
* ---------------------------------------------------------------------
* Server(C) have a thousand of cores and user configured it to 32 partitions
* MDS_NTHRS_BASE(64) * 32 = 2048
*
* which is already above soft limit MDS_NTHRS_MAX(1024), but we still need
* to guarantee that each partition has at least MDS_NTHRS_BASE(64) threads
* to keep service healthy, so total number of threads will just be 2048.
*
* NB: we don't suggest to choose server with that many cores because backend
* filesystem itself, buffer cache, or underlying network stack might
* have some SMP scalability issues at that large scale.
*
* If user already has a fat machine with hundreds or thousands of cores,
* there are two choices for configuration:
* a) create CPU table from subset of all CPUs and run Lustre on
* top of this subset
* b) bind service threads on a few partitions, see modparameters of
* MDS and OSS for details
*
* NB: these calculations (and examples below) are simplified to help
* understanding, the real implementation is a little more complex,
* please see ptlrpc_server_nthreads_check() for details.
*
*/
/*
* LDLM threads constants:
*
* Given 8 as factor and 24 as base threads number
*
* example 1)
* On 4-core machine we will have 24 + 8 * 4 = 56 threads.
*
* example 2)
* On 8-core machine with 2 partitions we will have 24 + 4 * 8 = 56
* threads for each partition and total threads number will be 112.
*
* example 3)
* On 64-core machine with 8 partitions we will need LDLM_NTHRS_BASE(24)
* threads for each partition to keep service healthy, so total threads
* number should be 24 * 8 = 192.
*
* So with these constants, threads number will be at the similar level
* of old versions, unless target machine has over a hundred cores
*/
#define LDLM_THR_FACTOR 8
#define LDLM_NTHRS_INIT PTLRPC_NTHRS_INIT
#define LDLM_NTHRS_BASE 24
#define LDLM_NTHRS_MAX (num_online_cpus() == 1 ? 64 : 128)
#define LDLM_BL_THREADS LDLM_NTHRS_AUTO_INIT
#define LDLM_CLIENT_NBUFS 1
#define LDLM_SERVER_NBUFS 64
#define LDLM_BUFSIZE (8 * 1024)
#define LDLM_MAXREQSIZE (5 * 1024)
#define LDLM_MAXREPSIZE (1024)
/*
* MDS threads constants:
*
* Please see examples in "Thread Constants", MDS threads number will be at
* the comparable level of old versions, unless the server has many cores.
*/
#ifndef MDS_MAX_THREADS
#define MDS_MAX_THREADS 1024
#define MDS_MAX_OTHR_THREADS 256
#else /* MDS_MAX_THREADS */
#if MDS_MAX_THREADS < PTLRPC_NTHRS_INIT
#undef MDS_MAX_THREADS
#define MDS_MAX_THREADS PTLRPC_NTHRS_INIT
#endif
#define MDS_MAX_OTHR_THREADS max(PTLRPC_NTHRS_INIT, MDS_MAX_THREADS / 2)
#endif
/* default service */
#define MDS_THR_FACTOR 8
#define MDS_NTHRS_INIT PTLRPC_NTHRS_INIT
#define MDS_NTHRS_MAX MDS_MAX_THREADS
#define MDS_NTHRS_BASE min(64, MDS_NTHRS_MAX)
/* read-page service */
#define MDS_RDPG_THR_FACTOR 4
#define MDS_RDPG_NTHRS_INIT PTLRPC_NTHRS_INIT
#define MDS_RDPG_NTHRS_MAX MDS_MAX_OTHR_THREADS
#define MDS_RDPG_NTHRS_BASE min(48, MDS_RDPG_NTHRS_MAX)
/* these should be removed when we remove setattr service in the future */
#define MDS_SETA_THR_FACTOR 4
#define MDS_SETA_NTHRS_INIT PTLRPC_NTHRS_INIT
#define MDS_SETA_NTHRS_MAX MDS_MAX_OTHR_THREADS
#define MDS_SETA_NTHRS_BASE min(48, MDS_SETA_NTHRS_MAX)
/* non-affinity threads */
#define MDS_OTHR_NTHRS_INIT PTLRPC_NTHRS_INIT
#define MDS_OTHR_NTHRS_MAX MDS_MAX_OTHR_THREADS
#define MDS_NBUFS 64
/**
* Assume file name length = FNAME_MAX = 256 (true for ext3).
* path name length = PATH_MAX = 4096
* LOV MD size max = EA_MAX = 24 * 2000
* (NB: 24 is size of lov_ost_data)
* LOV LOGCOOKIE size max = 32 * 2000
* (NB: 32 is size of llog_cookie)
* symlink: FNAME_MAX + PATH_MAX <- largest
* link: FNAME_MAX + PATH_MAX (mds_rec_link < mds_rec_create)
* rename: FNAME_MAX + FNAME_MAX
* open: FNAME_MAX + EA_MAX
*
* MDS_MAXREQSIZE ~= 4736 bytes =
* lustre_msg + ldlm_request + mdt_body + mds_rec_create + FNAME_MAX + PATH_MAX
* MDS_MAXREPSIZE ~= 8300 bytes = lustre_msg + llog_header
*
* Realistic size is about 512 bytes (20 character name + 128 char symlink),
* except in the open case where there are a large number of OSTs in a LOV.
*/
#define MDS_MAXREQSIZE (5 * 1024) /* >= 4736 */
#define MDS_MAXREPSIZE (9 * 1024) /* >= 8300 */
/**
* MDS incoming request with LOV EA
* 24 = sizeof(struct lov_ost_data), i.e: replay of opencreate
*/
#define MDS_LOV_MAXREQSIZE max(MDS_MAXREQSIZE, \
362 + LOV_MAX_STRIPE_COUNT * 24)
/**
* MDS outgoing reply with LOV EA
*
* NB: max reply size Lustre 2.4+ client can get from old MDS is:
* LOV_MAX_STRIPE_COUNT * (llog_cookie + lov_ost_data) + extra bytes
*
* but 2.4 or later MDS will never send reply with llog_cookie to any
* version client. This macro is defined for server side reply buffer size.
*/
#define MDS_LOV_MAXREPSIZE MDS_LOV_MAXREQSIZE
/**
* This is the size of a maximum REINT_SETXATTR request:
*
* lustre_msg 56 (32 + 4 x 5 + 4)
* ptlrpc_body 184
* mdt_rec_setxattr 136
* lustre_capa 120
* name 256 (XATTR_NAME_MAX)
* value 65536 (XATTR_SIZE_MAX)
*/
#define MDS_EA_MAXREQSIZE 66288
/**
* These are the maximum request and reply sizes (rounded up to 1 KB
* boundaries) for the "regular" MDS_REQUEST_PORTAL and MDS_REPLY_PORTAL.
*/
#define MDS_REG_MAXREQSIZE (((max(MDS_EA_MAXREQSIZE, \
MDS_LOV_MAXREQSIZE) + 1023) >> 10) << 10)
#define MDS_REG_MAXREPSIZE MDS_REG_MAXREQSIZE
/**
* The update request includes all of updates from the create, which might
* include linkea (4K maxim), together with other updates, we set it to 1000K:
* lustre_msg + ptlrpc_body + OUT_UPDATE_BUFFER_SIZE_MAX
*/
#define OUT_MAXREQSIZE (1000 * 1024)
#define OUT_MAXREPSIZE MDS_MAXREPSIZE
#define BUT_MAXREQSIZE OUT_MAXREQSIZE
#define BUT_MAXREPSIZE BUT_MAXREQSIZE
/** MDS_BUFSIZE = max_reqsize (w/o LOV EA) + max sptlrpc payload size */
#define MDS_BUFSIZE max(MDS_MAXREQSIZE + SPTLRPC_MAX_PAYLOAD, \
8 * 1024)
/**
* MDS_REG_BUFSIZE should at least be MDS_REG_MAXREQSIZE + SPTLRPC_MAX_PAYLOAD.
* However, we need to allocate a much larger buffer for it because LNet
* requires each MD(rqbd) has at least MDS_REQ_MAXREQSIZE bytes left to avoid
* dropping of maximum-sized incoming request. So if MDS_REG_BUFSIZE is only a
* little larger than MDS_REG_MAXREQSIZE, then it can only fit in one request
* even there are about MDS_REG_MAX_REQSIZE bytes left in a rqbd, and memory
* utilization is very low.
*
* In the meanwhile, size of rqbd can't be too large, because rqbd can't be
* reused until all requests fit in it have been processed and released,
* which means one long blocked request can prevent the rqbd be reused.
* Now we set request buffer size to 160 KB, so even each rqbd is unlinked
* from LNet with unused 65 KB, buffer utilization will be about 59%.
* Please check LU-2432 for details.
*/
#define MDS_REG_BUFSIZE max(MDS_REG_MAXREQSIZE + SPTLRPC_MAX_PAYLOAD, \
160 * 1024)
/**
* OUT_BUFSIZE = max_out_reqsize + max sptlrpc payload (~1K) which is
* about 10K, for the same reason as MDS_REG_BUFSIZE, we also give some
* extra bytes to each request buffer to improve buffer utilization rate.
*/
#define OUT_BUFSIZE max(OUT_MAXREQSIZE + SPTLRPC_MAX_PAYLOAD, \
24 * 1024)
/** FLD_MAXREQSIZE == lustre_msg + __u32 padding + ptlrpc_body + opc */
#define FLD_MAXREQSIZE (160)
/** FLD_MAXREPSIZE == lustre_msg + ptlrpc_body */
#define FLD_MAXREPSIZE (152)
#define FLD_BUFSIZE (1 << 12)
/**
* SEQ_MAXREQSIZE == lustre_msg + __u32 padding + ptlrpc_body + opc + lu_range +
* __u32 padding
*/
#define SEQ_MAXREQSIZE (160)
/** SEQ_MAXREPSIZE == lustre_msg + ptlrpc_body + lu_range */
#define SEQ_MAXREPSIZE (152)
#define SEQ_BUFSIZE (1 << 12)
/** MGS threads must be >= 3, see bug 22458 comment #28 */
#define MGS_NTHRS_INIT (PTLRPC_NTHRS_INIT + 1)
#define MGS_NTHRS_MAX 32
#define MGS_NBUFS 64
#define MGS_BUFSIZE (8 * 1024)
#define MGS_MAXREQSIZE (7 * 1024)
#define MGS_MAXREPSIZE (9 * 1024)
/*
* OSS threads constants:
*
* Given 8 as factor and 64 as base threads number
*
* example 1):
* On 8-core server configured to 2 partitions, we will have
* 64 + 8 * 4 = 96 threads for each partition, 192 total threads.
*
* example 2):
* On 32-core machine configured to 4 partitions, we will have
* 64 + 8 * 8 = 112 threads for each partition, so total threads number
* will be 112 * 4 = 448.
*
* example 3):
* On 64-core machine configured to 4 partitions, we will have
* 64 + 16 * 8 = 192 threads for each partition, so total threads number
* will be 192 * 4 = 768 which is above limit OSS_NTHRS_MAX(512), so we
* cut off the value to OSS_NTHRS_MAX(512) / 4 which is 128 threads
* for each partition.
*
* So we can see that with these constants, threads number wil be at the
* similar level of old versions, unless the server has many cores.
*/
/* depress threads factor for VM with small memory size */
#define OSS_THR_FACTOR min_t(int, 8, \
NUM_CACHEPAGES >> (28 - PAGE_SHIFT))
#define OSS_NTHRS_INIT (PTLRPC_NTHRS_INIT + 1)
#define OSS_NTHRS_BASE 64
/* threads for handling "create" request */
#define OSS_CR_THR_FACTOR 1
#define OSS_CR_NTHRS_INIT PTLRPC_NTHRS_INIT
#define OSS_CR_NTHRS_BASE 8
#define OSS_CR_NTHRS_MAX 64
/**
* OST_IO_MAXREQSIZE ~=
* lustre_msg + ptlrpc_body + obdo + obd_ioobj +
* DT_MAX_BRW_PAGES * niobuf_remote
*
* - single object with 16 pages is 512 bytes
* - OST_IO_MAXREQSIZE must be at least 1 niobuf per page of data
* - Must be a multiple of 1024
* - should allow a reasonably large SHORT_IO_BYTES size (64KB)
*/
#define _OST_MAXREQSIZE_BASE ((unsigned long)(sizeof(struct lustre_msg) + \
/* lm_buflens */ sizeof(__u32) * 4 + \
sizeof(struct ptlrpc_body) + \
sizeof(struct obdo) + \
sizeof(struct obd_ioobj) + \
sizeof(struct niobuf_remote)))
#define _OST_MAXREQSIZE_SUM ((unsigned long)(_OST_MAXREQSIZE_BASE + \
sizeof(struct niobuf_remote) * \
DT_MAX_BRW_PAGES))
/**
* FIEMAP request can be 4K+ for now
*/
#define OST_MAXREQSIZE (16UL * 1024UL)
#define OST_IO_MAXREQSIZE max(OST_MAXREQSIZE, \
((_OST_MAXREQSIZE_SUM - 1) | \
(1024UL - 1)) + 1)
/* Safe estimate of free space in standard RPC, provides upper limit for # of
* bytes of i/o to pack in RPC (skipping bulk transfer).
*/
#define OST_MAX_SHORT_IO_BYTES ((OST_IO_MAXREQSIZE - _OST_MAXREQSIZE_BASE) & \
PAGE_MASK)
/* Actual size used for short i/o buffer. Calculation means this:
* At least one page (for large PAGE_SIZE), or 16 KiB, but not more
* than the available space aligned to a page boundary.
*/
#define OBD_DEF_SHORT_IO_BYTES min(max(PAGE_SIZE, 16UL * 1024UL), \
OST_MAX_SHORT_IO_BYTES)
#define OST_MAXREPSIZE (9 * 1024)
#define OST_IO_MAXREPSIZE OST_MAXREPSIZE
#define OST_NBUFS 64
/** OST_BUFSIZE = max_reqsize + max sptlrpc payload size */
#define OST_BUFSIZE max_t(int, OST_MAXREQSIZE + 1024, 32 * 1024)
/**
* OST_IO_MAXREQSIZE is 18K, giving extra 46K can increase buffer utilization
* rate of request buffer, please check comment of MDS_LOV_BUFSIZE for details.
*/
#define OST_IO_BUFSIZE max_t(int, OST_IO_MAXREQSIZE + 1024, 64 * 1024)
/* Macro to hide a typecast and BUILD_BUG. */
#define ptlrpc_req_async_args(_var, req) ({ \
BUILD_BUG_ON(sizeof(*_var) > sizeof(req->rq_async_args)); \
(typeof(_var))&req->rq_async_args; \
})
struct ptlrpc_replay_async_args {
int praa_old_state;
int praa_old_status;
};
/* max latency being allowed when connection is busy */
#define CPU_MAX_RESUME_LATENCY_US 20
/* default time during which low latency will be set */
#define DEFAULT_CPU_LATENCY_TIMEOUT_US 3000
/**
* Structure for PM QoS management.
*/
struct cpu_latency_qos {
struct dev_pm_qos_request *pm_qos_req;
struct delayed_work delayed_work;
/* current/last time being active, in jiffies */
u64 deadline;
/* max timeout value already used, in usecs */
u64 max_time;
struct mutex lock;
};
/* per-cpu PM QoS management */
extern struct cpu_latency_qos *cpus_latency_qos;
/* whether we should use PM-QoS to lower CPUs resume latency during I/O */
extern bool ptlrpc_enable_pmqos;
/* max CPUs power resume latency to be used during I/O */
extern int ptlrpc_pmqos_latency_max_usec;
/* default timeout to end CPUs resume latency constraint */
extern u64 ptlrpc_pmqos_default_duration_usec;
/* whether we should use PM-QoS to lower CPUs resume latency during I/O */
extern bool ptlrpc_pmqos_use_stats_for_duration;
/**
* Structure to single define portal connection.
*/
struct ptlrpc_connection {
/** linkage for connections hash table */
struct rhash_head c_hash;
/** Remote side nid for this connection */
struct lnet_processid c_peer;
/** reference counter for this connection */
atomic_t c_refcount;
};
/** Client definition for PortalRPC */
struct ptlrpc_client {
/** What lnet portal does this client send messages to by default */
__u32 cli_request_portal;
/** What portal do we expect replies on */
__u32 cli_reply_portal;
/** Name of the client */
const char *cli_name;
};
/** state flags of requests */
/* XXX only ones left are those used by the bulk descs as well! */
#define PTL_RPC_FL_INTR BIT(0) /* reply wait was interrupted by user */
#define PTL_RPC_FL_TIMEOUT BIT(7) /* req timed out waiting for reply */
#define REQ_MAX_ACK_LOCKS 8
union ptlrpc_async_args {
/**
* Scratchpad for passing args to completion interpreter. Users
* cast to the struct of their choosing, and BUILD_BUG_ON that this is
* big enough. For _tons_ of context, OBD_ALLOC a struct and store
* a pointer to it here. The pointer_arg ensures this struct is at
* least big enough for that.
*/
void *pointer_arg[11];
__u64 space[7];
};
struct ptlrpc_request_set;
typedef int (*set_producer_func)(struct ptlrpc_request_set *, void *);
/*
* Definition of request set structure.
* Request set is a list of requests (not necessary to the same target) that
* once populated with RPCs could be sent in parallel.
* There are two kinds of request sets. General purpose and with dedicated
* serving thread. Example of the latter is ptlrpcd set.
* For general purpose sets once request set started sending it is impossible
* to add new requests to such set.
* Provides a way to call "completion callbacks" when all requests in the set
* returned.
*/
struct ptlrpc_request_set {
struct kref set_refcount;
/* number of in queue requests */
atomic_t set_new_count;
/* number of uncompleted requests. */
atomic_t set_remaining;
/* wait queue to wait on for request events */
wait_queue_head_t set_waitq;
/* List of requests in the set */
struct list_head set_requests;
/*
* Lock for \a set_new_requests manipulations
* locked so that any old caller can communicate requests to
* the set holder who can then fold them into the lock-free set
*/
spinlock_t set_new_req_lock;
/* List of new yet unsent requests. Only used with ptlrpcd now. */
struct list_head set_new_requests;
/* rq_status of requests that have been freed already */
int set_rc;
/* Additional fields used by the flow control extension */
/* Maximum number of RPCs in flight */
int set_max_inflight;
/* Callback function used to generate RPCs */
set_producer_func set_producer;
/* opaq argument passed to the producer callback */
void *set_producer_arg;
unsigned int set_allow_intr:1;
};
struct ptlrpc_bulk_desc;
struct ptlrpc_service_part;
struct ptlrpc_service;
/**
* ptlrpc callback & work item stuff
*/
struct ptlrpc_cb_id {
void (*cbid_fn)(struct lnet_event *ev); /* specific callback fn */
void *cbid_arg; /* additional arg */
};
/** Maximum number of locks to fit into reply state, migrating directory max
* stripe count is 2 * LMV_MAX_STRIPES_PER_MDT, plus source parent, target
* parent, source and target master object:
* 2 * LMV_MAX_STRIPES_PER_MDT + 4
*/
#define RS_MAX_LOCKS 14
#define RS_DEBUG 0
/**
* Structure to define reply state on the server
* Reply state holds various reply message information. Also for "difficult"
* replies (rep-ack case) we store the state after sending reply and wait
* for the client to acknowledge the reception. In these cases locks could be
* added to the state for replay/failover consistency guarantees.
*/
struct ptlrpc_reply_state {
/** Callback description */
struct ptlrpc_cb_id rs_cb_id;
/** Linkage for list of all reply states in a system */
struct list_head rs_list;
/** Linkage for list of all reply states on same export */
struct list_head rs_exp_list;
/** Linkage for list of all reply states for same obd */
struct list_head rs_obd_list;
#if RS_DEBUG
struct list_head rs_debug_list;
#endif
/** A spinlock to protect the reply state flags */
spinlock_t rs_lock;
/** Reply state flags */
unsigned long rs_difficult:1; /* ACK/commit stuff */
unsigned long rs_no_ack:1; /* no ACK, (incl difficult reqs) */
unsigned long rs_scheduled:1; /* being handled? */
unsigned long rs_scheduled_ever:1;/* any schedule attempts? */
unsigned long rs_handled:1; /* been handled yet? */
unsigned long rs_sent:1; /* Got LNET_EVENT_SEND? */
unsigned long rs_unlinked:1; /* Reply MD unlinked? */
unsigned long rs_prealloc:1; /* rs from prealloc list */
/* transaction committed and rs dispatched by ptlrpc_commit_replies */
unsigned long rs_committed:1;
struct kref rs_refcount; /* number of users */
/** Number of locks awaiting client ACK */
int rs_nlocks;
/** Size of the state */
int rs_size;
/** opcode */
__u32 rs_opc;
/** Transaction number */
__u64 rs_transno;
/** xid */
__u64 rs_xid;
struct obd_export *rs_export;
struct ptlrpc_service_part *rs_svcpt;
/** Lnet metadata handle for the reply */
struct lnet_handle_md rs_md_h;
/** Context for the sevice thread */
struct ptlrpc_svc_ctx *rs_svc_ctx;
/** Reply buffer (actually sent to the client), encoded if needed */
struct lustre_msg *rs_repbuf; /* wrapper */
/** Size of the reply buffer */
int rs_repbuf_len; /* wrapper buf length */
/** Size of the reply message */
int rs_repdata_len; /* wrapper msg length */
/**
* Actual reply message. Its content is encrupted (if needed) to
* produce reply buffer for actual sending. In simple case
* of no network encryption we jus set \a rs_repbuf to \a rs_msg
*/
struct lustre_msg *rs_msg; /* reply message */
/** Handles of locks awaiting client reply ACK */
struct lustre_handle rs_locks[RS_MAX_LOCKS];
};
struct ptlrpc_thread;
/** RPC stages */
enum rq_phase {
RQ_PHASE_NEW = 0xebc0de00,
RQ_PHASE_RPC = 0xebc0de01,
RQ_PHASE_BULK = 0xebc0de02,
RQ_PHASE_INTERPRET = 0xebc0de03,
RQ_PHASE_COMPLETE = 0xebc0de04,
RQ_PHASE_UNREG_RPC = 0xebc0de05,
RQ_PHASE_UNREG_BULK = 0xebc0de06,
RQ_PHASE_UNDEFINED = 0xebc0de07
};
/** Type of request interpreter call-back */
typedef int (*ptlrpc_interpterer_t)(const struct lu_env *env,
struct ptlrpc_request *req,
void *arg, int rc);
/** Type of request resend call-back */
typedef void (*ptlrpc_resend_cb_t)(struct ptlrpc_request *req,
void *arg);
/**
* Definition of request pool structure.
* The pool is used to store empty preallocated requests for the case
* when we would actually need to send something without performing
* any allocations (to avoid e.g. OOM).
*/
struct ptlrpc_request_pool {
/** Locks the list */
spinlock_t prp_lock;
/** list of ptlrpc_request structs */
struct list_head prp_req_list;
/** Maximum message size that would fit into a rquest from this pool */
int prp_rq_size;
/** Function to allocate more requests for this pool */
int (*prp_populate)(struct ptlrpc_request_pool *, int);
};
struct lu_context;
struct lu_env;
struct ldlm_lock;
#include <lustre_nrs.h>
/**
* Basic request prioritization operations structure.
* The whole idea is centered around locks and RPCs that might affect locks.
* When a lock is contended we try to give priority to RPCs that might lead
* to fastest release of that lock.
* Currently only implemented for OSTs only in a way that makes all
* IO and truncate RPCs that are coming from a locked region where a lock is
* contended a priority over other requests.
*/
struct ptlrpc_hpreq_ops {
/**
* Check if the lock handle of the given lock is the same as
* taken from the request.
*/
int (*hpreq_lock_match)(struct ptlrpc_request *, struct ldlm_lock *);
/**
* Check if the request is a high priority one.
*/
int (*hpreq_check)(struct ptlrpc_request *);
/**
* Called after the request has been handled.
*/
void (*hpreq_fini)(struct ptlrpc_request *);
};
struct ptlrpc_cli_req {
/** For bulk requests on client only: bulk descriptor */
struct ptlrpc_bulk_desc *cr_bulk;
/** optional time limit for send attempts. This is a timeout
* not a timestamp so timeout_t (s32) is used instead of time64_t
*/
ktime_t cr_delay_limit_ns;
/** time request was first queued */
ktime_t cr_queued_time_ns;
/** request sent in nanoseconds */
ktime_t cr_sent_ns;
/** time for request really sent out */
ktime_t cr_sent_out_ns;
/** when req reply unlink must finish. */
time64_t cr_reply_deadline;
/** when req bulk unlink must finish. */
time64_t cr_bulk_deadline;
/** when req unlink must finish. */
time64_t cr_req_deadline;
/** Portal to which this request would be sent */
short cr_req_ptl;
/** Portal where to wait for reply and where reply would be sent */
short cr_rep_ptl;
/** request resending number */
unsigned int cr_resend_nr;
/** What was import generation when this request was sent */
int cr_imp_gen;
enum lustre_imp_state cr_send_state;
/** Per-request waitq introduced by bug 21938 for recovery waiting */
wait_queue_head_t cr_set_waitq;
/** Link item for request set lists */
struct list_head cr_set_chain;
/** link to waited ctx */
struct list_head cr_ctx_chain;
/** client's half ctx */
struct ptlrpc_cli_ctx *cr_cli_ctx;
/** Link back to the request set */
struct ptlrpc_request_set *cr_set;
/** outgoing request MD handle */
struct lnet_handle_md cr_req_md_h;
/** request-out callback parameter */
struct ptlrpc_cb_id cr_req_cbid;
/** incoming reply MD handle */
struct lnet_handle_md cr_reply_md_h;
wait_queue_head_t cr_reply_waitq;
/** reply callback parameter */
struct ptlrpc_cb_id cr_reply_cbid;
/** Async completion handler, called when reply is received */
ptlrpc_interpterer_t cr_reply_interp;
/** Resend handler, called when request is resend to update RPC data */
ptlrpc_resend_cb_t cr_resend_cb;
/** Async completion context */
union ptlrpc_async_args cr_async_args;
/** Opaq data for replay and commit callbacks. */
void *cr_cb_data;
/** Link to the imp->imp_unreplied_list */
struct list_head cr_unreplied_list;
/**
* Commit callback, called when request is committed and about to be
* freed.
*/
void (*cr_commit_cb)(struct ptlrpc_request *);
/** Replay callback, called after request is replayed at recovery */
void (*cr_replay_cb)(struct ptlrpc_request *);
};
/** client request member alias */
/* NB: these alias should NOT be used by any new code, instead they should
* be removed step by step to avoid potential abuse
*/
#define rq_bulk rq_cli.cr_bulk
#define rq_delay_limit_ns rq_cli.cr_delay_limit_ns
#define rq_queued_time_ns rq_cli.cr_queued_time_ns
#define rq_sent_ns rq_cli.cr_sent_ns
#define rq_real_sent_ns rq_cli.cr_sent_out_ns
#define rq_reply_deadline rq_cli.cr_reply_deadline
#define rq_bulk_deadline rq_cli.cr_bulk_deadline
#define rq_req_deadline rq_cli.cr_req_deadline
#define rq_nr_resend rq_cli.cr_resend_nr
#define rq_request_portal rq_cli.cr_req_ptl
#define rq_reply_portal rq_cli.cr_rep_ptl
#define rq_import_generation rq_cli.cr_imp_gen
#define rq_send_state rq_cli.cr_send_state
#define rq_set_chain rq_cli.cr_set_chain
#define rq_ctx_chain rq_cli.cr_ctx_chain
#define rq_set rq_cli.cr_set
#define rq_set_waitq rq_cli.cr_set_waitq
#define rq_cli_ctx rq_cli.cr_cli_ctx
#define rq_req_md_h rq_cli.cr_req_md_h
#define rq_req_cbid rq_cli.cr_req_cbid
#define rq_reply_md_h rq_cli.cr_reply_md_h
#define rq_reply_waitq rq_cli.cr_reply_waitq
#define rq_reply_cbid rq_cli.cr_reply_cbid
#define rq_interpret_reply rq_cli.cr_reply_interp
#define rq_resend_cb rq_cli.cr_resend_cb
#define rq_async_args rq_cli.cr_async_args
#define rq_cb_data rq_cli.cr_cb_data
#define rq_unreplied_list rq_cli.cr_unreplied_list
#define rq_commit_cb rq_cli.cr_commit_cb
#define rq_replay_cb rq_cli.cr_replay_cb
struct ptlrpc_srv_req {
/** initial thread servicing this request */
struct ptlrpc_thread *sr_svc_thread;
/**
* Server side list of incoming unserved requests sorted by arrival
* time. Traversed from time to time to notice about to expire
* requests and sent back "early replies" to clients to let them
* know server is alive and well, just very busy to service their
* requests in time
*/
struct list_head sr_timed_list;
/** server-side per-export list */
struct list_head sr_exp_list;
/** server-side history, used for debuging purposes. */
struct list_head sr_hist_list;
/** history sequence # */
__u64 sr_hist_seq;
/** the index of service's srv_at_array into which request is linked */
__u32 sr_at_index;
/** authed uid */
uid_t sr_auth_uid;
/** authed uid mapped to */
uid_t sr_auth_mapped_uid;
/** RPC is generated from what part of Lustre */
enum lustre_sec_part sr_sp_from;
/** request session context */
struct lu_context sr_ses;
/** \addtogroup nrs
* @{
*/
/** stub for NRS request */
struct ptlrpc_nrs_request sr_nrq;
/** @} nrs */
/** request arrival time */
struct timespec64 sr_arrival_time;
/** server's half ctx */
struct ptlrpc_svc_ctx *sr_svc_ctx;
/** (server side), pointed directly into req buffer */
struct ptlrpc_user_desc *sr_user_desc;
/** separated reply state, may be vmalloc'd */
struct ptlrpc_reply_state *sr_reply_state;
/** server-side hp handlers */
struct ptlrpc_hpreq_ops *sr_ops;
/** incoming request buffer */
struct ptlrpc_request_buffer_desc *sr_rqbd;
};
/** server request member alias */
/* NB: these alias should NOT be used by any new code, instead they should
* be removed step by step to avoid potential abuse
*/
#define rq_svc_thread rq_srv.sr_svc_thread
#define rq_timed_list rq_srv.sr_timed_list
#define rq_exp_list rq_srv.sr_exp_list
#define rq_history_list rq_srv.sr_hist_list
#define rq_history_seq rq_srv.sr_hist_seq
#define rq_at_index rq_srv.sr_at_index
#define rq_auth_uid rq_srv.sr_auth_uid
#define rq_auth_mapped_uid rq_srv.sr_auth_mapped_uid
#define rq_sp_from rq_srv.sr_sp_from
#define rq_session rq_srv.sr_ses
#define rq_nrq rq_srv.sr_nrq
#define rq_arrival_time rq_srv.sr_arrival_time
#define rq_reply_state rq_srv.sr_reply_state
#define rq_svc_ctx rq_srv.sr_svc_ctx
#define rq_user_desc rq_srv.sr_user_desc
#define rq_ops rq_srv.sr_ops
#define rq_rqbd rq_srv.sr_rqbd
#define rq_reqmsg rq_pill.rc_reqmsg
#define rq_repmsg rq_pill.rc_repmsg
#define rq_req_swab_mask rq_pill.rc_req_swab_mask
#define rq_rep_swab_mask rq_pill.rc_rep_swab_mask
/**
* Represents remote procedure call.
*
* This is a staple structure used by everybody wanting to send a request
* in Lustre.
*/
struct ptlrpc_request {
/* Request type: one of PTL_RPC_MSG_* */
int rq_type;
/** Result of request processing */
int rq_status;
/**
* Linkage item through which this request is included into
* sending/delayed lists on client and into rqbd list on server
*/
struct list_head rq_list;
/** Lock to protect request flags and some other important bits, like
* rq_list
*/
spinlock_t rq_lock;
spinlock_t rq_early_free_lock;
/** client-side flags are serialized by rq_lock @{ */
unsigned int rq_intr:1, rq_replied:1, rq_err:1,
rq_timedout:1, rq_resend:1, rq_restart:1,
/**
* when ->rq_replay is set, request is kept by the client even
* after server commits corresponding transaction. This is
* used for operations that require sequence of multiple
* requests to be replayed. The only example currently is file
* open/close. When last request in such a sequence is
* committed, ->rq_replay is cleared on all requests in the
* sequence.
*/
rq_replay:1,
rq_no_resend:1, rq_waiting:1, rq_receiving_reply:1,
rq_no_delay:1, rq_net_err:1, rq_wait_ctx:1,
rq_early:1,
rq_req_unlinked:1, /* unlinked request buffer from lnet */
rq_reply_unlinked:1, /* unlinked reply buffer from lnet */
rq_memalloc:1, /* req originated from "kswapd" */
rq_committed:1,
rq_reply_truncated:1,
/** whether the "rq_set" is a valid one */
rq_invalid_rqset:1,
rq_generation_set:1,
/** do not resend request on -EINPROGRESS */
rq_no_retry_einprogress:1,
/* allow req to be sent if the import is in recovery status */
rq_allow_replay:1,
/* bulk request, sent to server, but uncommitted */
rq_unstable:1,
rq_early_free_repbuf:1, /* free reply buffer in advance */
rq_allow_intr:1,
rq_pause_after_reply:1;
/** @} */
/** server-side flags are serialized by rq_lock @{ */
unsigned int
rq_hp:1, /**< high priority RPC */
rq_at_linked:1, /**< link into service's srv_at_array */
rq_packed_final:1, /**< packed final reply */
rq_obsolete:1; /* aborted by a signal on a client */
/** @} */
/** one of RQ_PHASE_* */
enum rq_phase rq_phase;
/** one of RQ_PHASE_* to be used next */
enum rq_phase rq_next_phase;
/**
* client-side refcount for SENT race, server-side refcounf
* for multiple replies
*/
atomic_t rq_refcount;
/**
* client-side:
* !rq_truncate : # reply bytes actually received,
* rq_truncate : required repbuf_len for resend
*/
int rq_nob_received;
/** Request length */
int rq_reqlen;
/** Reply length */
int rq_replen;
/** Pool if request is from preallocated list */
struct ptlrpc_request_pool *rq_pool;
/** Transaction number */
__u64 rq_transno;
/** xid */
__u64 rq_xid;
/** bulk match bits */
__u64 rq_mbits;
/** reply match bits */
__u64 rq_rep_mbits;
/**
* List item to for replay list. Not yet committed requests get linked
* there.
* Also see \a rq_replay comment above.
* It's also link chain on obd_export::exp_req_replay_queue
*/
struct list_head rq_replay_list;
/** non-shared members for client & server request*/
union {
struct ptlrpc_cli_req rq_cli;
struct ptlrpc_srv_req rq_srv;
};
/* security and encryption data */
/* description of flavors for client & server */
struct sptlrpc_flavor rq_flvr;
/* client/server security flags */
unsigned int
rq_ctx_init:1, /* context initiation */
rq_ctx_fini:1, /* context destroy */
rq_bulk_read:1, /* request bulk read */
rq_bulk_write:1, /* request bulk write */
/* server authentication flags */
rq_auth_gss:1, /* authenticated by gss */
rq_auth_usr_root:1, /* authed as root */
rq_auth_usr_mdt:1, /* authed as mdt */
rq_auth_usr_ost:1, /* authed as ost */
/* security tfm flags */
rq_pack_udesc:1,
rq_pack_bulk:1,
/* doesn't expect reply FIXME */
rq_no_reply:1,
rq_pill_init:1, /* pill initialized */
rq_srv_req:1; /* server request */
/** various buffer pointers */
struct lustre_msg *rq_reqbuf; /**< req wrapper, vmalloc*/
char *rq_repbuf; /**< rep buffer, vmalloc */
struct lustre_msg *rq_repdata; /**< rep wrapper msg */
/** only in priv mode */
struct lustre_msg *rq_clrbuf;
int rq_reqbuf_len; /* req wrapper buf len */
int rq_reqdata_len; /* req wrapper msg len */
int rq_repbuf_len; /* rep buffer len */
int rq_repdata_len; /* rep wrapper msg len */
int rq_clrbuf_len; /* only in priv mode */
int rq_clrdata_len; /* only in priv mode */
/** early replies go to offset 0, regular replies go after that */
unsigned int rq_reply_off;
/** @} */
/** how many early replies (for stats) */
int rq_early_count;
/** Server-side, export on which request was received */
struct obd_export *rq_export;
/** import where request is being sent */
struct obd_import *rq_import;
/** our LNet NID */
struct lnet_nid rq_self;
/** Peer description (the other side) */
struct lnet_processid rq_peer;
/** Descriptor for the NID from which the peer sent the request. */
struct lnet_processid rq_source;
/**
* service time estimate (secs)
* If the request is not served by this time, it is marked as timed out.
* Do not change to time64_t since this is transmitted over the wire.
*
* The linux kernel handles timestamps with time64_t and timeouts
* are normally done with jiffies. Lustre shares the rq_timeout between
* nodes. Since jiffies can vary from node to node Lustre instead
* will express the timeout value in seconds. To avoid confusion with
* timestamps (time64_t) and jiffy timeouts (long) Lustre timeouts
* are expressed in s32 (timeout_t). Also what is transmitted over
* the wire is 32 bits.
*/
timeout_t rq_timeout;
/**
* when request/reply sent (secs), or time when request should be sent
*/
time64_t rq_sent;
/** when request must finish. */
time64_t rq_deadline;
/** request format description */
struct req_capsule rq_pill;
};
/**
* Call completion handler for rpc if any, return it's status or original
* rc if there was no handler defined for this request.
*/
static inline int ptlrpc_req_interpret(const struct lu_env *env,
struct ptlrpc_request *req, int rc)
{
if (req->rq_interpret_reply != NULL) {
req->rq_status = req->rq_interpret_reply(env, req,
&req->rq_async_args,
rc);
return req->rq_status;
}
return rc;
}
/** \addtogroup nrs
* @{
*/
void ptlrpc_nrs_req_hp_move(struct ptlrpc_request *req);
/*
* Can the request be moved from the regular NRS head to the high-priority NRS
* head (of the same PTLRPC service partition), if any?
*
* For a reliable result, this should be checked under svcpt->scp_req lock.
*/
static inline bool ptlrpc_nrs_req_can_move(struct ptlrpc_request *req)
{
struct ptlrpc_nrs_request *nrq = &req->rq_nrq;
/**
* LU-898: Check ptlrpc_nrs_request::nr_enqueued to make sure the
* request has been enqueued first, and ptlrpc_nrs_request::nr_started
* to make sure it has not been scheduled yet (analogous to previous
* (non-NRS) checking of !list_empty(&ptlrpc_request::rq_list).
*/
return nrq->nr_enqueued && !nrq->nr_started && !req->rq_hp;
}
/** @} nrs */
static inline bool req_capsule_ptlreq(struct req_capsule *pill)
{
struct ptlrpc_request *req = pill->rc_req;
return req != NULL && pill == &req->rq_pill;
}
static inline bool req_capsule_subreq(struct req_capsule *pill)
{
struct ptlrpc_request *req = pill->rc_req;
return req == NULL || pill != &req->rq_pill;
}
/**
* Returns true if request needs to be swabbed into local cpu byteorder
*/
static inline bool req_capsule_req_need_swab(struct req_capsule *pill)
{
struct ptlrpc_request *req = pill->rc_req;
return req && req_capsule_req_swabbed(&req->rq_pill,
MSG_PTLRPC_HEADER_OFF);
}
/**
* Returns true if request reply needs to be swabbed into local cpu byteorder
*/
static inline bool req_capsule_rep_need_swab(struct req_capsule *pill)
{
struct ptlrpc_request *req = pill->rc_req;
return req && req_capsule_rep_swabbed(&req->rq_pill,
MSG_PTLRPC_HEADER_OFF);
}
/**
* Convert numerical request phase value \a phase into text string description
*/
static inline const char *
ptlrpc_phase2str(enum rq_phase phase)
{
switch (phase) {
case RQ_PHASE_NEW:
return "New";
case RQ_PHASE_RPC:
return "Rpc";
case RQ_PHASE_BULK:
return "Bulk";
case RQ_PHASE_INTERPRET:
return "Interpret";
case RQ_PHASE_COMPLETE:
return "Complete";
case RQ_PHASE_UNREG_RPC:
return "UnregRPC";
case RQ_PHASE_UNREG_BULK:
return "UnregBULK";
default:
return "?Phase?";
}
}
/**
* Convert numerical request phase of the request \a req into text stringi
* description
*/
static inline const char *
ptlrpc_rqphase2str(struct ptlrpc_request *req)
{
return ptlrpc_phase2str(req->rq_phase);
}
/**
* Debugging functions and helpers to print request structure into debug log
* @{
*/
/* Spare the preprocessor, spoil the bugs. */
#define FLAG(field, str) (field ? str : "")
/** Convert bit flags into a string */
#define DEBUG_REQ_FLAGS(req) \
ptlrpc_rqphase2str(req), \
FLAG(req->rq_intr, "I"), FLAG(req->rq_replied, "R"), \
FLAG(req->rq_err, "E"), FLAG(req->rq_net_err, "e"), \
FLAG(req->rq_timedout, "X") /* eXpired */, FLAG(req->rq_resend, "S"), \
FLAG(req->rq_restart, "T"), FLAG(req->rq_replay, "P"), \
FLAG(req->rq_no_resend, "N"), FLAG(req->rq_no_reply, "n"), \
FLAG(req->rq_waiting, "W"), \
FLAG(req->rq_wait_ctx, "C"), FLAG(req->rq_hp, "H"), \
FLAG(req->rq_committed, "M"), \
FLAG(req->rq_req_unlinked, "Q"), \
FLAG(req->rq_reply_unlinked, "U"), \
FLAG(req->rq_receiving_reply, "r")
#define REQ_FLAGS_FMT "%s:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s"
__printf(3, 4) /* __attribute__ */
void _debug_req(struct ptlrpc_request *req,
struct libcfs_debug_msg_data *data, const char *fmt, ...);
/**
* Helper that decides if we need to print request accordig to current debug
* level settings
*/
#define debug_req(msgdata, mask, cdls, req, fmt, a...) \
do { \
if (((mask) & D_CANTMASK) != 0 || \
((libcfs_debug & (mask)) != 0 && \
(libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) \
_debug_req((req), msgdata, fmt, ##a); \
} while (0)
/**
* This is the debug print function you need to use to print request sturucture
* content into lustre debug log.
* for most callers (level is a constant) this is resolved at compile time
*/
#define DEBUG_REQ(level, req, fmt, args...) \
do { \
if ((level) & (D_ERROR | D_WARNING)) { \
static struct cfs_debug_limit_state cdls; \
LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, level, &cdls); \
debug_req(&msgdata, level, &cdls, req, "@@@ "fmt" ", ## args);\
} else { \
LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, level, NULL); \
debug_req(&msgdata, level, NULL, req, "@@@ "fmt" ", ## args); \
} \
} while (0)
/** @} */
enum ptlrpc_bulk_op_type {
PTLRPC_BULK_OP_ACTIVE = 0x00000001,
PTLRPC_BULK_OP_PASSIVE = 0x00000002,
PTLRPC_BULK_OP_PUT = 0x00000004,
PTLRPC_BULK_OP_GET = 0x00000008,
PTLRPC_BULK_GET_SOURCE = PTLRPC_BULK_OP_PASSIVE | PTLRPC_BULK_OP_GET,
PTLRPC_BULK_PUT_SINK = PTLRPC_BULK_OP_PASSIVE | PTLRPC_BULK_OP_PUT,
PTLRPC_BULK_GET_SINK = PTLRPC_BULK_OP_ACTIVE | PTLRPC_BULK_OP_GET,
PTLRPC_BULK_PUT_SOURCE = PTLRPC_BULK_OP_ACTIVE | PTLRPC_BULK_OP_PUT,
};
static inline bool ptlrpc_is_bulk_op_get(enum ptlrpc_bulk_op_type type)
{
return (type & PTLRPC_BULK_OP_GET) == PTLRPC_BULK_OP_GET;
}
static inline bool ptlrpc_is_bulk_get_source(enum ptlrpc_bulk_op_type type)
{
return (type & PTLRPC_BULK_GET_SOURCE) == PTLRPC_BULK_GET_SOURCE;
}
static inline bool ptlrpc_is_bulk_put_sink(enum ptlrpc_bulk_op_type type)
{
return (type & PTLRPC_BULK_PUT_SINK) == PTLRPC_BULK_PUT_SINK;
}
static inline bool ptlrpc_is_bulk_get_sink(enum ptlrpc_bulk_op_type type)
{
return (type & PTLRPC_BULK_GET_SINK) == PTLRPC_BULK_GET_SINK;
}
static inline bool ptlrpc_is_bulk_put_source(enum ptlrpc_bulk_op_type type)
{
return (type & PTLRPC_BULK_PUT_SOURCE) == PTLRPC_BULK_PUT_SOURCE;
}
static inline bool ptlrpc_is_bulk_op_active(enum ptlrpc_bulk_op_type type)
{
return ((type & PTLRPC_BULK_OP_ACTIVE) |
(type & PTLRPC_BULK_OP_PASSIVE))
== PTLRPC_BULK_OP_ACTIVE;
}
static inline bool ptlrpc_is_bulk_op_passive(enum ptlrpc_bulk_op_type type)
{
return ((type & PTLRPC_BULK_OP_ACTIVE) |
(type & PTLRPC_BULK_OP_PASSIVE))
== PTLRPC_BULK_OP_PASSIVE;
}
struct ptlrpc_bulk_frag_ops {
/**
* Add a page \a page to the bulk descriptor \a desc
* Data to transfer in the page starts at offset \a pageoffset and
* amount of data to transfer from the page is \a len
*/
void (*add_kiov_frag)(struct ptlrpc_bulk_desc *desc,
struct page *page, int pageoffset, int len);
/*
* Add a \a fragment to the bulk descriptor \a desc.
* Data to transfer in the fragment is pointed to by \a frag
* The size of the fragment is \a len
*/
int (*add_iov_frag)(struct ptlrpc_bulk_desc *desc, void *frag, int len);
/**
* Uninitialize and free bulk descriptor \a desc.
* Works on bulk descriptors both from server and client side.
*/
void (*release_frags)(struct ptlrpc_bulk_desc *desc);
};
extern const struct ptlrpc_bulk_frag_ops ptlrpc_bulk_kiov_pin_ops;
extern const struct ptlrpc_bulk_frag_ops ptlrpc_bulk_kiov_nopin_ops;
/*
* Definition of bulk descriptor.
* Bulks are special "Two phase" RPCs where initial request message
* is sent first and it is followed bt a transfer (o receiving) of a large
* amount of data to be settled into pages referenced from the bulk descriptors.
* Bulks transfers (the actual data following the small requests) are done
* on separate LNet portals.
* In lustre we use bulk transfers for READ and WRITE transfers from/to OSTs.
* Another user is readpage for MDT.
*/
struct ptlrpc_bulk_desc {
unsigned int bd_refs; /* number MD's assigned including zero-sends */
/** completed with failure */
unsigned long bd_failure:1,
/** client side */
bd_registered:1,
/* bulk request is GPU RDMA transfer, use page->host as real address */
bd_is_rdma:1,
bd_is_srv:1; /* export or import should be used */
/** For serialization with callback */
spinlock_t bd_lock;
/** {put,get}{source,sink}{kvec,kiov} */
enum ptlrpc_bulk_op_type bd_type;
/** LNet portal for this bulk */
__u32 bd_portal;
/** Server side - export this bulk created for */
struct obd_export *bd_export;
/** Client side - import this bulk was sent on */
struct obd_import *bd_import;
/** Back pointer to the request */
struct ptlrpc_request *bd_req;
const struct ptlrpc_bulk_frag_ops *bd_frag_ops;
wait_queue_head_t bd_waitq; /* server side only WQ */
int bd_iov_count; /* # entries in bd_iov */
int bd_max_iov; /* allocated size of bd_iov */
int bd_nob; /* # bytes covered */
int bd_nob_transferred; /* # bytes GOT/PUT */
unsigned int bd_iop_len; /* md iop bytes */
__u64 bd_last_mbits;
struct ptlrpc_cb_id bd_cbid; /* network callback info */
struct lnet_nid bd_sender; /* stash event::sender */
int bd_md_count; /* # valid entries in bd_mds */
int bd_md_max_brw; /* max entries in bd_mds */
/** array of offsets for each MD */
unsigned int bd_mds_off[PTLRPC_BULK_OPS_LIMIT];
/** array of associated MDs */
struct lnet_handle_md bd_mds[PTLRPC_BULK_OPS_LIMIT];
/* encrypted iov, size is either 0 or bd_iov_count. */
struct bio_vec *bd_enc_vec;
struct bio_vec *bd_vec;
};
enum ptlrpc_thread_state {
SVC_INIT = 0,
SVC_STOPPED = BIT(0),
SVC_STOPPING = BIT(1),
SVC_STARTING = BIT(2),
SVC_RUNNING = BIT(3),
SVC_WATCHDOG = BIT(4),
};
#define PTLRPC_THR_NAME_LEN 32
/**
* Definition of server service thread structure
*/
struct ptlrpc_thread {
struct list_head t_link; /* active threads svcpt->scp_threads */
void *t_data; /* thread-private memory (vmalloc) */
enum ptlrpc_thread_state t_flags;
unsigned int t_id; /* index, from ptlrpc_start_threads */
struct task_struct *t_task; /* service thread */
pid_t t_pid; /* kernel process ID */
ktime_t t_touched; /* last active time */
struct delayed_work t_watchdog; /* inactivity watchdog timer */
struct ptlrpc_service_part *t_svcpt; /* service the thread belongs to */
wait_queue_head_t t_ctl_waitq;/* waiter for thread starter */
struct lu_env *t_env;
char t_name[PTLRPC_THR_NAME_LEN];
};
static inline int thread_is_init(struct ptlrpc_thread *thread)
{
return thread->t_flags == 0;
}
static inline int thread_is_stopped(struct ptlrpc_thread *thread)
{
return !!(thread->t_flags & SVC_STOPPED);
}
static inline int thread_is_stopping(struct ptlrpc_thread *thread)
{
return !!(thread->t_flags & SVC_STOPPING);
}
static inline int thread_is_starting(struct ptlrpc_thread *thread)
{
return !!(thread->t_flags & SVC_STARTING);
}
static inline int thread_is_running(struct ptlrpc_thread *thread)
{
return !!(thread->t_flags & SVC_RUNNING);
}
static inline void thread_clear_flags(struct ptlrpc_thread *thread, __u32 flags)
{
thread->t_flags &= ~flags;
}
static inline void thread_set_flags(struct ptlrpc_thread *thread, __u32 flags)
{
thread->t_flags = flags;
}
static inline void thread_add_flags(struct ptlrpc_thread *thread, __u32 flags)
{
thread->t_flags |= flags;
}
static inline int thread_test_and_clear_flags(struct ptlrpc_thread *thread,
__u32 flags)
{
if (thread->t_flags & flags) {
thread->t_flags &= ~flags;
return 1;
}
return 0;
}
/**
* Request buffer descriptor structure.
* This is a structure that contains one posted request buffer for service.
* Once data land into a buffer, event callback creates actual request and
* notifies wakes one of the service threads to process new incoming request.
* More than one request can fit into the buffer.
*/
struct ptlrpc_request_buffer_desc {
/** Link item for rqbds on a service */
struct list_head rqbd_list;
/** History of requests for this buffer */
struct list_head rqbd_reqs;
/** Back pointer to service for which this buffer is registered */
struct ptlrpc_service_part *rqbd_svcpt;
/** LNet descriptor */
struct lnet_handle_md rqbd_md_h;
int rqbd_refcount;
/** The buffer itself */
char *rqbd_buffer;
struct ptlrpc_cb_id rqbd_cbid;
/**
* This "embedded" request structure is only used for the
* last request to fit into the buffer
*/
struct ptlrpc_request rqbd_req;
};
typedef int (*svc_handler_t)(struct ptlrpc_request *req);
struct ptlrpc_service_ops {
/**
* if non-NULL called during thread creation (ptlrpc_start_thread())
* to initialize service specific per-thread state.
*/
int (*so_thr_init)(struct ptlrpc_thread *thr);
/**
* if non-NULL called during thread shutdown (ptlrpc_main()) to
* destruct state created by ->srv_init().
*/
void (*so_thr_done)(struct ptlrpc_thread *thr);
/**
* Handler function for incoming requests for this service
*/
int (*so_req_handler)(struct ptlrpc_request *req);
/**
* function to determine priority of the request, it's called
* on every new request
*/
int (*so_hpreq_handler)(struct ptlrpc_request *);
/**
* service-specific print fn
*/
void (*so_req_printer)(void *, struct ptlrpc_request *);
};
#ifndef __cfs_cacheline_aligned
/* NB: put it here for reducing patche dependence */
# define __cfs_cacheline_aligned
#endif
/**
* How many high priority requests to serve before serving one normal
* priority request
*/
#define PTLRPC_SVC_HP_RATIO 10
/**
* Definition of PortalRPC service.
* The service is listening on a particular portal (like tcp port)
* and perform actions for a specific server like IO service for OST
* or general metadata service for MDS.
*/
struct ptlrpc_service {
/** serialize /proc operations */
spinlock_t srv_lock;
/** most often accessed fields */
/** chain thru all services */
struct list_head srv_list;
/** service operations table */
struct ptlrpc_service_ops srv_ops;
/** only statically allocated strings here; we don't clean them */
char *srv_name;
/** only statically allocated strings here; we don't clean them */
char *srv_thread_name;
/** threads # should be created for each partition on initializing */
int srv_nthrs_cpt_init;
/** limit of threads number for each partition */
int srv_nthrs_cpt_limit;
/** Root of debugfs dir tree for this service */
struct dentry *srv_debugfs_entry;
/** Pointer to statistic data for this service */
struct lprocfs_stats *srv_stats;
/** # hp per lp reqs to handle */
int srv_hpreq_ratio;
/** biggest request to receive */
int srv_max_req_size;
/** biggest reply to send */
int srv_max_reply_size;
/** size of individual buffers */
int srv_buf_size;
/** # buffers to allocate in 1 group */
int srv_nbuf_per_group;
/** Local portal on which to receive requests */
__u32 srv_req_portal;
/** Portal on the client to send replies to */
__u32 srv_rep_portal;
/**
* Tags for lu_context associated with this thread, see struct
* lu_context.
*/
__u32 srv_ctx_tags;
/** soft watchdog timeout multiplier */
int srv_watchdog_factor;
/** under unregister_service */
unsigned srv_is_stopping:1;
/** Whether or not to restrict service threads to CPUs in this CPT */
unsigned srv_cpt_bind:1;
/** max # request buffers */
int srv_nrqbds_max;
/** max # request buffers in history per partition */
int srv_hist_nrqbds_cpt_max;
/** number of CPTs this service associated with */
int srv_ncpts;
/** CPTs array this service associated with */
__u32 *srv_cpts;
/** 2^srv_cptab_bits >= cfs_cpt_numbert(srv_cptable) */
int srv_cpt_bits;
/** CPT table this service is running over */
struct cfs_cpt_table *srv_cptable;
/* sysfs object */
struct kobject srv_kobj;
struct completion srv_kobj_unregister;
/**
* partition data for ptlrpc service
*/
struct ptlrpc_service_part *srv_parts[];
};
/**
* Definition of PortalRPC service partition data.
* Although a service only has one instance of it right now, but we
* will have multiple instances very soon (instance per CPT).
*
* it has four locks:
* \a scp_lock
* serialize operations on rqbd and requests waiting for preprocess
* \a scp_req_lock
* serialize operations active requests sent to this portal
* \a scp_at_lock
* serialize adaptive timeout stuff
* \a scp_rep_lock
* serialize operations on RS list (reply states)
*
* We don't have any use-case to take two or more locks at the same time
* for now, so there is no lock order issue.
*/
struct ptlrpc_service_part {
/** back reference to owner */
struct ptlrpc_service *scp_service __cfs_cacheline_aligned;
/* CPT id, reserved */
int scp_cpt;
/** always increasing number */
int scp_thr_nextid;
/** # of starting threads */
int scp_nthrs_starting;
/** # running threads */
int scp_nthrs_running;
/** service threads list */
struct list_head scp_threads;
/**
* serialize the following fields, used for protecting
* rqbd list and incoming requests waiting for preprocess,
* threads starting & stopping are also protected by this lock.
*/
spinlock_t scp_lock __cfs_cacheline_aligned;
/** userland serialization */
struct mutex scp_mutex;
/** total # req buffer descs allocated */
int scp_nrqbds_total;
/** # posted request buffers for receiving */
int scp_nrqbds_posted;
/** in progress of allocating rqbd */
int scp_rqbd_allocating;
/** # incoming reqs */
int scp_nreqs_incoming;
/** request buffers to be reposted */
struct list_head scp_rqbd_idle;
/** req buffers receiving */
struct list_head scp_rqbd_posted;
/** incoming reqs */
struct list_head scp_req_incoming;
/** timeout before re-posting reqs, in jiffies */
long scp_rqbd_timeout;
/**
* all threads sleep on this. This wait-queue is signalled when new
* incoming request arrives and when difficult reply has to be handled.
*/
wait_queue_head_t scp_waitq;
/** request history */
struct list_head scp_hist_reqs;
/** request buffer history */
struct list_head scp_hist_rqbds;
/** # request buffers in history */
int scp_hist_nrqbds;
/** sequence number for request */
__u64 scp_hist_seq;
/** highest seq culled from history */
__u64 scp_hist_seq_culled;
/**
* serialize the following fields, used for processing requests
* sent to this portal
*/
spinlock_t scp_req_lock __cfs_cacheline_aligned;
/** # reqs in either of the NRS heads below */
/** # reqs being served */
int scp_nreqs_active;
/** # HPreqs being served */
int scp_nhreqs_active;
/** # hp requests handled */
int scp_hreq_count;
/** NRS head for regular requests */
struct ptlrpc_nrs scp_nrs_reg;
/** NRS head for HP reqs; valid for services that can handle HP reqs */
struct ptlrpc_nrs *scp_nrs_hp;
/** when the last request was handled on this service */
time64_t scp_last_request;
/** AT stuff */
/** @{ */
/**
* serialize the following fields, used for changes on
* adaptive timeout
*/
spinlock_t scp_at_lock __cfs_cacheline_aligned;
/** estimated rpc service time */
struct adaptive_timeout scp_at_estimate;
/** reqs waiting for replies */
struct ptlrpc_at_array scp_at_array;
/** early reply timer */
struct timer_list scp_at_timer;
/** debug */
ktime_t scp_at_checktime;
/** check early replies */
unsigned int scp_at_check;
/** @} */
/**
* serialize the following fields, used for processing
* replies for this portal
*/
spinlock_t scp_rep_lock __cfs_cacheline_aligned;
/** all the active replies */
struct list_head scp_rep_active;
/** List of free reply_states */
struct list_head scp_rep_idle;
/** waitq to run, when adding stuff to srv_free_rs_list */
wait_queue_head_t scp_rep_waitq;
/** # 'difficult' replies */
atomic_t scp_nreps_difficult;
};
#define ptlrpc_service_for_each_part(part, i, svc) \
for (i = 0; \
i < (svc)->srv_ncpts && \
(svc)->srv_parts != NULL && \
((part) = (svc)->srv_parts[i]) != NULL; i++)
/**
* Declaration of ptlrpcd control structure
*/
struct ptlrpcd_ctl {
/**
* Ptlrpc thread control flags (LIOD_START, LIOD_STOP, LIOD_FORCE)
*/
unsigned long pc_flags;
/**
* Thread lock protecting structure fields.
*/
spinlock_t pc_lock;
/**
* Start completion.
*/
struct completion pc_starting;
/**
* Stop completion.
*/
struct completion pc_finishing;
/**
* Thread requests set.
*/
struct ptlrpc_request_set *pc_set;
/**
* Thread name used in kthread_run()
*/
char pc_name[16];
/**
* CPT the thread is bound on.
*/
int pc_cpt;
/**
* Index of ptlrpcd thread in the array.
*/
int pc_index;
/**
* Pointer to the array of partners' ptlrpcd_ctl structure.
*/
struct ptlrpcd_ctl **pc_partners;
/**
* Number of the ptlrpcd's partners.
*/
int pc_npartners;
/**
* Record the partner index to be processed next.
*/
int pc_cursor;
/**
* Error code if the thread failed to fully start.
*/
int pc_error;
};
/* Bits for pc_flags */
enum ptlrpcd_ctl_flags {
/**
* Ptlrpc thread start flag.
*/
LIOD_START = BIT(0),
/**
* Ptlrpc thread stop flag.
*/
LIOD_STOP = BIT(1),
/**
* Ptlrpc thread force flag (only stop force so far).
* This will cause aborting any inflight rpcs handled
* by thread if LIOD_STOP is specified.
*/
LIOD_FORCE = BIT(2),
/**
* This is a recovery ptlrpc thread.
*/
LIOD_RECOVERY = BIT(3),
};
/**
* \addtogroup nrs
* @{
*
* Service compatibility function; the policy is compatible with all services.
*
* \param[in] svc The service the policy is attempting to register with.
* \param[in] desc The policy descriptor
*
* \retval true The policy is compatible with the service
*
* \see ptlrpc_nrs_pol_desc::pd_compat()
*/
static inline bool nrs_policy_compat_all(const struct ptlrpc_service *svc,
const struct ptlrpc_nrs_pol_desc *desc)
{
return true;
}
/**
* Service compatibility function; the policy is compatible with only a specific
* service which is identified by its human-readable name at
* ptlrpc_service::srv_name.
*
* \param[in] svc The service the policy is attempting to register with.
* \param[in] desc The policy descriptor
*
* \retval false The policy is not compatible with the service
* \retval true The policy is compatible with the service
*
* \see ptlrpc_nrs_pol_desc::pd_compat()
*/
static inline bool nrs_policy_compat_one(const struct ptlrpc_service *svc,
const struct ptlrpc_nrs_pol_desc *desc)
{
LASSERT(desc->pd_compat_svc_name != NULL);
return strcmp(svc->srv_name, desc->pd_compat_svc_name) == 0;
}
/** @} nrs */
/* ptlrpc/events.c */
extern int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
struct lnet_processid *peer,
struct lnet_nid *self,
u32 refnet);
/**
* These callbacks are invoked by LNet when something happened to
* underlying buffer
* @{
*/
extern void request_out_callback(struct lnet_event *ev);
extern void reply_in_callback(struct lnet_event *ev);
extern void client_bulk_callback(struct lnet_event *ev);
extern void request_in_callback(struct lnet_event *ev);
extern void reply_out_callback(struct lnet_event *ev);
#ifdef CONFIG_LUSTRE_FS_SERVER
extern void server_bulk_callback(struct lnet_event *ev);
#endif
/** @} */
/* ptlrpc/connection.c */
struct ptlrpc_connection *ptlrpc_connection_get(struct lnet_processid *peer,
struct lnet_nid *self,
struct obd_uuid *uuid);
static inline void ptlrpc_connection_put(struct ptlrpc_connection *conn)
{
if (!conn)
return;
LASSERT(atomic_read(&conn->c_refcount) > 0);
/*
* We do not remove connection from hashtable and
* do not free it even if last caller released ref,
* as we want to have it cached for the case it is
* needed again.
*
* Deallocating it and later creating new connection
* again would be wastful. This way we also avoid
* expensive locking to protect things from get/put
* race when found cached connection is freed by
* ptlrpc_connection_put().
*
* It will be freed later in module unload time,
* when ptlrpc_connection_fini()->lh_exit->conn_exit()
* path is called.
*/
atomic_dec(&conn->c_refcount);
CDEBUG(D_INFO, "PUT conn=%p refcount %d to %s\n",
conn, atomic_read(&conn->c_refcount),
libcfs_nidstr(&conn->c_peer.nid));
}
struct ptlrpc_connection *ptlrpc_connection_addref(struct ptlrpc_connection *);
int ptlrpc_connection_init(void);
void ptlrpc_connection_fini(void);
extern lnet_pid_t ptl_get_pid(void);
/* ptlrpc/niobuf.c */
/**
* Actual interfacing with LNet to put/get/register/unregister stuff
* @{
*/
#ifdef CONFIG_LUSTRE_FS_SERVER
struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
unsigned int nfrags,
unsigned int max_brw,
unsigned int type,
unsigned int portal,
const struct ptlrpc_bulk_frag_ops
*ops);
int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc);
void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc);
static inline int ptlrpc_server_bulk_active(struct ptlrpc_bulk_desc *desc)
{
int rc;
LASSERT(desc != NULL);
spin_lock(&desc->bd_lock);
rc = desc->bd_refs;
spin_unlock(&desc->bd_lock);
return rc;
}
#endif
int ptlrpc_register_bulk(struct ptlrpc_request *req);
int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async);
static inline int ptlrpc_client_bulk_active(struct ptlrpc_request *req)
{
struct ptlrpc_bulk_desc *desc;
int rc;
LASSERT(req != NULL);
desc = req->rq_bulk;
if (!desc)
return 0;
if (req->rq_bulk_deadline > ktime_get_real_seconds())
return 1;
spin_lock(&desc->bd_lock);
rc = desc->bd_refs;
spin_unlock(&desc->bd_lock);
return rc;
}
#define PTLRPC_REPLY_MAYBE_DIFFICULT 0x01
#define PTLRPC_REPLY_EARLY 0x02
int ptlrpc_send_reply(struct ptlrpc_request *req, int flags);
int ptlrpc_reply(struct ptlrpc_request *req);
int ptlrpc_send_error(struct ptlrpc_request *req, int difficult);
int ptlrpc_error(struct ptlrpc_request *req);
int ptlrpc_at_get_net_latency(struct ptlrpc_request *req);
int ptl_send_rpc(struct ptlrpc_request *request, int noreply);
int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd);
/** @} */
/* ptlrpc/client.c */
/**
* Client-side portals API. Everything to send requests, receive replies,
* request queues, request management, etc.
* @{
*/
void ptlrpc_request_committed(struct ptlrpc_request *req, int force);
void ptlrpc_init_client(int req_portal, int rep_portal, const char *name,
struct ptlrpc_client *pc);
void ptlrpc_cleanup_client(struct obd_import *imp);
struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid,
u32 refnet);
int ptlrpc_queue_wait(struct ptlrpc_request *req);
int ptlrpc_replay_req(struct ptlrpc_request *req);
void ptlrpc_restart_req(struct ptlrpc_request *req);
void ptlrpc_abort_inflight(struct obd_import *imp);
void ptlrpc_cleanup_imp(struct obd_import *imp);
void ptlrpc_abort_set(struct ptlrpc_request_set *set);
struct ptlrpc_request_set *ptlrpc_prep_set(void);
struct ptlrpc_request_set *ptlrpc_prep_fcset(int max, set_producer_func func,
void *arg);
int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set);
int ptlrpc_set_wait(const struct lu_env *env, struct ptlrpc_request_set *set);
void ptlrpc_set_destroy(struct ptlrpc_request_set *set);
void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
struct ptlrpc_request *req);
#define PTLRPCD_SET ((struct ptlrpc_request_set *)1)
void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool);
int ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq);
struct ptlrpc_request_pool *
ptlrpc_init_rq_pool(int num_rq, int msgsiz,
int (*populate_pool)(struct ptlrpc_request_pool *, int));
void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req);
struct ptlrpc_request *ptlrpc_request_alloc(struct obd_import *imp,
const struct req_format *format);
struct ptlrpc_request *ptlrpc_request_alloc_pool(struct obd_import *imp,
struct ptlrpc_request_pool *pr,
const struct req_format *fmat);
void ptlrpc_request_free(struct ptlrpc_request *request);
int ptlrpc_request_pack(struct ptlrpc_request *request, __u32 version,
int opcode);
struct ptlrpc_request *
ptlrpc_request_alloc_pack(struct obd_import *imp,
const struct req_format *format,
__u32 version, int opcode);
int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
__u32 version, int opcode, char **bufs,
struct ptlrpc_cli_ctx *ctx);
void obd_mod_free(struct kref *kref);
void ptlrpc_req_put(struct ptlrpc_request *request);
void ptlrpc_req_put_with_imp_lock(struct ptlrpc_request *request);
struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req);
struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp(struct ptlrpc_request *req,
unsigned int nfrags,
unsigned int max_brw, unsigned int type,
unsigned int portal,
const struct ptlrpc_bulk_frag_ops *ops);
void __ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
struct page *page, int pageoffset, int len,
int pin);
void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *bulk);
static inline void ptlrpc_release_bulk_noop(struct ptlrpc_bulk_desc *desc)
{
}
void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
struct obd_import *imp);
__u64 ptlrpc_next_xid(void);
__u64 ptlrpc_sample_next_xid(void);
__u64 ptlrpc_req_xid(struct ptlrpc_request *request);
void ptlrpc_get_mod_rpc_slot(struct ptlrpc_request *req);
void ptlrpc_put_mod_rpc_slot(struct ptlrpc_request *req);
/** @} */
struct ptlrpc_service_buf_conf {
/* nbufs is buffers # to allocate when growing the pool */
unsigned int bc_nbufs;
/* buffer size to post */
unsigned int bc_buf_size;
/* portal to listed for requests on */
unsigned int bc_req_portal;
/* portal of where to send replies to */
unsigned int bc_rep_portal;
/* maximum request size to be accepted for this service */
unsigned int bc_req_max_size;
/* maximum reply size this service can ever send */
unsigned int bc_rep_max_size;
};
struct ptlrpc_service_thr_conf {
/* threadname should be 8 characters or less - 6 will be added on */
char *tc_thr_name;
/* threads increasing factor for each CPU */
unsigned int tc_thr_factor;
/* service threads # to start on each partition while initializing */
unsigned int tc_nthrs_init;
/*
* low water of threads # upper-limit on each partition while running,
* service availability may be impacted if threads number is lower
* than this value. It can be ZERO if the service doesn't require
* CPU affinity or there is only one partition.
*/
unsigned int tc_nthrs_base;
/* "soft" limit for total threads number */
unsigned int tc_nthrs_max;
/* user specified threads number, it will be validated due to
* other members of this structure.
*/
unsigned int tc_nthrs_user;
/* bind service threads to only CPUs in their associated CPT */
unsigned int tc_cpu_bind;
/* Tags for lu_context associated with service thread */
__u32 tc_ctx_tags;
};
struct ptlrpc_service_cpt_conf {
struct cfs_cpt_table *cc_cptable;
/* string pattern to describe CPTs for a service */
char *cc_pattern;
/* whether or not to have per-CPT service partitions */
bool cc_affinity;
};
struct ptlrpc_service_conf {
/* service name */
char *psc_name;
/* soft watchdog timeout multiplifier to print stuck service traces */
unsigned int psc_watchdog_factor;
/* buffer information */
struct ptlrpc_service_buf_conf psc_buf;
/* thread information */
struct ptlrpc_service_thr_conf psc_thr;
/* CPU partition information */
struct ptlrpc_service_cpt_conf psc_cpt;
/* function table */
struct ptlrpc_service_ops psc_ops;
};
/* ptlrpc/service.c */
/**
* Server-side services API. Register/unregister service, request state
* management, service thread management
*
* @{
*/
void ptlrpc_save_lock(struct ptlrpc_request *req, struct lustre_handle *lock,
bool no_ack);
void ptlrpc_commit_replies(struct obd_export *exp);
void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs);
void ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs);
int ptlrpc_hpreq_handler(struct ptlrpc_request *req);
struct ptlrpc_service *ptlrpc_register_service(
struct ptlrpc_service_conf *conf,
struct kset *parent,
struct dentry *debugfs_entry);
int ptlrpc_unregister_service(struct ptlrpc_service *service);
int ptlrpc_service_health_check(struct ptlrpc_service *service);
void ptlrpc_server_drop_request(struct ptlrpc_request *req);
void ptlrpc_del_exp_list(struct ptlrpc_request *req);
void ptlrpc_request_change_export(struct ptlrpc_request *req,
struct obd_export *export);
void ptlrpc_update_export_timer(struct ptlrpc_request *req);
timeout_t ptlrpc_export_prolong_timeout(struct ptlrpc_request *req,
bool recovery);
int ptlrpc_hr_init(void);
void ptlrpc_hr_fini(void);
void ptlrpc_watchdog_init(struct delayed_work *work, timeout_t timeout);
void ptlrpc_watchdog_disable(struct delayed_work *work);
void ptlrpc_watchdog_touch(struct delayed_work *work, timeout_t timeout);
void ptlrpc_watchdog_delete(struct delayed_work *work);
/** @} */
/* ptlrpc/import.c */
/**
* Import API
* @{
*/
int ptlrpc_connect_import(struct obd_import *imp);
int ptlrpc_connect_import_locked(struct obd_import *imp);
int ptlrpc_init_import(struct obd_import *imp);
int ptlrpc_disconnect_import_async(struct obd_import *imp, int noclose,
struct completion *a, int *r);
int ptlrpc_disconnect_import(struct obd_import *imp, int noclose);
int ptlrpc_disconnect_and_idle_import(struct obd_import *imp);
int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
void deuuidify(char *uuid, const char *prefix, char **uuid_start,
int *uuid_len);
void ptlrpc_import_enter_resend(struct obd_import *imp);
/* ptlrpc/pack_generic.c */
int ptlrpc_reconnect_import(struct obd_import *imp);
/** @} */
/**
* ptlrpc msg buffer and swab interface
*
* @{
*/
#define PTLRPC_MAX_BUFCOUNT \
(sizeof(((struct ptlrpc_request *)0)->rq_req_swab_mask) * 8)
#define MD_MAX_BUFLEN (MDS_REG_MAXREQSIZE > OUT_MAXREQSIZE ? \
MDS_REG_MAXREQSIZE : OUT_MAXREQSIZE)
#define PTLRPC_MAX_BUFLEN (OST_IO_MAXREQSIZE > MD_MAX_BUFLEN ? \
OST_IO_MAXREQSIZE : MD_MAX_BUFLEN)
int ptlrpc_unpack_rep_msg(struct ptlrpc_request *req, int len);
int ptlrpc_unpack_req_msg(struct ptlrpc_request *req, int len);
int lustre_msg_check_version(struct lustre_msg *msg,
enum lustre_msg_version version);
void lustre_init_msg_v2(struct lustre_msg_v2 *msg, int count, __u32 *lens,
char **bufs);
int lustre_pack_request(struct ptlrpc_request *req, __u32 magic, int count,
__u32 *lens, char **bufs);
int lustre_pack_reply(struct ptlrpc_request *req, int count, __u32 *lens,
char **bufs);
int lustre_pack_reply_v2(struct ptlrpc_request *req, int count,
__u32 *lens, char **bufs, int flags);
#define LPRFL_EARLY_REPLY 1
int lustre_pack_reply_flags(struct ptlrpc_request *, int count, __u32 *lens,
char **bufs, int flags);
int lustre_shrink_msg(struct lustre_msg *msg, int segment,
unsigned int newlen, int move_data);
int lustre_grow_msg(struct lustre_msg *msg, int segment, unsigned int newlen);
void lustre_free_reply_state(struct kref *kref);
int __lustre_unpack_msg(struct lustre_msg *m, int len);
__u32 lustre_msg_hdr_size(__u32 magic, __u32 count);
__u32 lustre_msg_size(__u32 magic, int count, __u32 *lengths);
__u32 lustre_msg_size_v2(int count, __u32 *lengths);
__u32 lustre_packed_msg_size(struct lustre_msg *msg);
extern __u32 lustre_msg_early_size;
void *lustre_msg_buf_v2(struct lustre_msg_v2 *m, __u32 n, __u32 min_size);
void *lustre_msg_buf(struct lustre_msg *m, __u32 n, __u32 minlen);
__u32 lustre_msg_buflen(struct lustre_msg *m, __u32 n);
void lustre_msg_set_buflen(struct lustre_msg *m, __u32 n, __u32 len);
__u32 lustre_msg_bufcount(struct lustre_msg *m);
char *lustre_msg_string(struct lustre_msg *m, __u32 n, __u32 max_len);
enum lustre_msghdr lustre_msghdr_get_flags(struct lustre_msg *msg);
void lustre_msghdr_set_flags(struct lustre_msg *msg, __u32 flags);
__u32 lustre_msg_get_flags(struct lustre_msg *msg);
void lustre_msg_add_flags(struct lustre_msg *msg, __u32 flags);
void lustre_msg_set_flags(struct lustre_msg *msg, __u32 flags);
void lustre_msg_clear_flags(struct lustre_msg *msg, __u32 flags);
__u32 lustre_msg_get_op_flags(struct lustre_msg *msg);
void lustre_msg_add_op_flags(struct lustre_msg *msg, __u32 flags);
struct lustre_handle *lustre_msg_get_handle(struct lustre_msg *msg);
__u32 lustre_msg_get_type(struct lustre_msg *msg);
enum lustre_msg_version lustre_msg_get_version(struct lustre_msg *msg);
void lustre_msg_add_version(struct lustre_msg *msg, __u32 version);
__u32 lustre_msg_get_opc(struct lustre_msg *msg);
__u64 lustre_msg_get_last_xid(struct lustre_msg *msg);
__u16 lustre_msg_get_tag(struct lustre_msg *msg);
__u64 lustre_msg_get_last_committed(struct lustre_msg *msg);
__u64 *lustre_msg_get_versions(struct lustre_msg *msg);
__u64 lustre_msg_get_transno(struct lustre_msg *msg);
__u64 lustre_msg_get_slv(struct lustre_msg *msg);
__u32 lustre_msg_get_limit(struct lustre_msg *msg);
void lustre_msg_set_slv(struct lustre_msg *msg, __u64 slv);
void lustre_msg_set_limit(struct lustre_msg *msg, __u64 limit);
int lustre_msg_get_status(struct lustre_msg *msg);
__u32 lustre_msg_get_conn_cnt(struct lustre_msg *msg);
__u32 lustre_msg_get_magic(struct lustre_msg *msg);
timeout_t lustre_msg_get_timeout(struct lustre_msg *msg);
timeout_t lustre_msg_get_service_timeout(struct lustre_msg *msg);
int lustre_msg_get_projid(struct lustre_msg *msg, __u32 *projid);
int lustre_msg_get_uid_gid(struct lustre_msg *msg, __u32 *uid, __u32 *gid);
char *lustre_msg_get_jobid(struct lustre_msg *msg);
__u32 lustre_msg_get_cksum(struct lustre_msg *msg);
__u64 lustre_msg_get_mbits(struct lustre_msg *msg);
__u32 lustre_msg_calc_cksum(struct lustre_msg *msg, __u32 buf);
void lustre_msg_set_handle(struct lustre_msg *msg,
struct lustre_handle *handle);
void lustre_msg_set_type(struct lustre_msg *msg, __u32 type);
void lustre_msg_set_opc(struct lustre_msg *msg, __u32 opc);
void lustre_msg_set_last_xid(struct lustre_msg *msg, __u64 last_xid);
void lustre_msg_set_tag(struct lustre_msg *msg, __u16 tag);
void lustre_msg_set_last_committed(struct lustre_msg *msg,
__u64 last_committed);
void lustre_msg_set_versions(struct lustre_msg *msg, __u64 *versions);
void lustre_msg_set_transno(struct lustre_msg *msg, __u64 transno);
void lustre_msg_set_status(struct lustre_msg *msg, __u32 status);
void lustre_msg_set_conn_cnt(struct lustre_msg *msg, __u32 conn_cnt);
void ptlrpc_request_set_replen(struct ptlrpc_request *req);
void lustre_msg_set_timeout(struct lustre_msg *msg, timeout_t timeout);
void lustre_msg_set_service_timeout(struct lustre_msg *msg,
timeout_t service_timeout);
/* jobid/uid/gid process information to pack */
struct job_info {
char ji_jobid[LUSTRE_JOBID_SIZE];
__u32 ji_uid;
__u32 ji_gid;
};
void lustre_msg_set_jobinfo(struct lustre_msg *msg, const struct job_info *ji);
void lustre_msg_set_projid(struct lustre_msg *msg, __u32 projid);
void lustre_msg_set_cksum(struct lustre_msg *msg, __u32 cksum);
void lustre_msg_set_mbits(struct lustre_msg *msg, __u64 mbits);
static inline void
lustre_shrink_reply(struct ptlrpc_request *req, int segment,
unsigned int newlen, int move_data)
{
LASSERT(req->rq_reply_state);
LASSERT(req->rq_repmsg);
req->rq_replen = lustre_shrink_msg(req->rq_repmsg, segment,
newlen, move_data);
}
#ifdef LUSTRE_TRANSLATE_ERRNOS
static inline int ptlrpc_status_hton(int h)
{
/*
* Positive errnos must be network errnos, such as LUSTRE_EDEADLK,
* ELDLM_LOCK_ABORTED, etc.
*/
if (h < 0)
return -lustre_errno_hton(-h);
else
return h;
}
static inline int ptlrpc_status_ntoh(int n)
{
/*
* See the comment in ptlrpc_status_hton().
*/
if (n < 0)
return -lustre_errno_ntoh(-n);
else
return n;
}
#else
#define ptlrpc_status_hton(h) (h)
#define ptlrpc_status_ntoh(n) (n)
#endif
/** @} */
/** Change request phase of \a req to \a new_phase */
static inline void
ptlrpc_rqphase_move(struct ptlrpc_request *req, enum rq_phase new_phase)
{
if (req->rq_phase == new_phase)
return;
if (new_phase == RQ_PHASE_UNREG_RPC ||
new_phase == RQ_PHASE_UNREG_BULK) {
/* No embedded unregistering phases */
if (req->rq_phase == RQ_PHASE_UNREG_RPC ||
req->rq_phase == RQ_PHASE_UNREG_BULK)
return;
req->rq_next_phase = req->rq_phase;
if (req->rq_import)
atomic_inc(&req->rq_import->imp_unregistering);
}
if (req->rq_phase == RQ_PHASE_UNREG_RPC ||
req->rq_phase == RQ_PHASE_UNREG_BULK) {
if (req->rq_import)
atomic_dec(&req->rq_import->imp_unregistering);
}
DEBUG_REQ(D_INFO, req, "move request phase from %s to %s",
ptlrpc_rqphase2str(req), ptlrpc_phase2str(new_phase));
req->rq_phase = new_phase;
}
/**
* Returns true if request \a req got early reply and hard deadline is not met
*/
static inline int
ptlrpc_client_early(struct ptlrpc_request *req)
{
return req->rq_early;
}
/**
* Returns true if we got real reply from server for this request
*/
static inline int
ptlrpc_client_replied(struct ptlrpc_request *req)
{
if (req->rq_reply_deadline > ktime_get_real_seconds())
return 0;
return req->rq_replied;
}
/** Returns true if request \a req is in process of receiving server reply */
static inline int
ptlrpc_client_recv(struct ptlrpc_request *req)
{
if (req->rq_reply_deadline > ktime_get_real_seconds())
return 1;
return req->rq_receiving_reply;
}
static inline int
ptlrpc_client_recv_or_unlink(struct ptlrpc_request *req)
{
int rc;
spin_lock(&req->rq_lock);
if (req->rq_reply_deadline > ktime_get_real_seconds()) {
spin_unlock(&req->rq_lock);
return 1;
}
if (req->rq_req_deadline > ktime_get_real_seconds()) {
spin_unlock(&req->rq_lock);
return 1;
}
rc = !req->rq_req_unlinked || !req->rq_reply_unlinked ||
req->rq_receiving_reply;
spin_unlock(&req->rq_lock);
return rc;
}
static inline void
ptlrpc_client_wake_req(struct ptlrpc_request *req)
{
smp_mb(); /* ensure client context is deleted before wakeing up */
if (req->rq_set == NULL)
wake_up(&req->rq_reply_waitq);
else
wake_up(&req->rq_set->set_waitq);
}
/* Should only be called once per req */
static inline void ptlrpc_req_drop_rs(struct ptlrpc_request *req)
{
if (req->rq_reply_state == NULL)
return; /* shouldn't occur */
/* req_repmsg equals rq_reply_state->rs_msg,
* so set it to NULL before rq_reply_state is possibly freed
*/
spin_lock(&req->rq_early_free_lock);
req->rq_repmsg = NULL;
spin_unlock(&req->rq_early_free_lock);
kref_put(&req->rq_reply_state->rs_refcount, lustre_free_reply_state);
req->rq_reply_state = NULL;
}
static inline __u32 lustre_request_magic(struct ptlrpc_request *req)
{
return lustre_msg_get_magic(req->rq_reqmsg);
}
static inline int ptlrpc_send_limit_expired(struct ptlrpc_request *req)
{
if (req->rq_delay_limit_ns != 0 &&
req->rq_queued_time_ns + req->rq_delay_limit_ns < ktime_get_real())
return 1;
return 0;
}
static inline int ptlrpc_no_resend(struct ptlrpc_request *req)
{
if (!req->rq_no_resend && ptlrpc_send_limit_expired(req)) {
spin_lock(&req->rq_lock);
req->rq_no_resend = 1;
spin_unlock(&req->rq_lock);
}
return req->rq_no_resend;
}
int ptlrpc_server_get_timeout(struct ptlrpc_service_part *svcpt);
static inline struct ptlrpc_service *
ptlrpc_req2svc(struct ptlrpc_request *req)
{
LASSERT(req->rq_rqbd != NULL);
return req->rq_rqbd->rqbd_svcpt->scp_service;
}
/* ldlm/ldlm_lib.c */
/**
* Target client logic
* @{
*/
int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg);
void client_obd_cleanup(struct obd_device *obd);
int client_connect_import(const struct lu_env *env,
struct obd_export **exp, struct obd_device *obd,
struct obd_uuid *cluuid, struct obd_connect_data *ocd,
void *localdata);
int client_disconnect_export(struct obd_export *exp);
int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
int priority);
int client_import_dyn_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
struct lnet_nid *prim_nid, int priority);
int client_import_add_nids_to_conn(struct obd_import *imp,
struct lnet_nid *nidlist,
int nid_count, struct obd_uuid *uuid);
int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid);
int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid);
void client_destroy_import(struct obd_import *imp);
/** @} */
#ifdef CONFIG_LUSTRE_FS_SERVER
int server_disconnect_export(struct obd_export *exp);
#endif
/* ptlrpc/pinger.c */
/**
* Pinger API (client side only)
* @{
*/
enum timeout_event {
TIMEOUT_GRANT = 1,
};
struct timeout_item;
typedef int (*timeout_cb_t)(struct timeout_item *, void *);
int ptlrpc_pinger_add_import(struct obd_import *imp);
int ptlrpc_pinger_del_import(struct obd_import *imp);
struct ptlrpc_request *ptlrpc_prep_ping(struct obd_import *imp);
int ptlrpc_obd_ping(struct obd_device *obd);
void ping_evictor_start(void);
void ping_evictor_stop(void);
void ptlrpc_pinger_ir_up(void);
void ptlrpc_pinger_ir_down(void);
/** @} */
int ptlrpc_pinger_suppress_pings(void);
/* ptlrpc/ptlrpcd.c */
void ptlrpcd_stop(struct ptlrpcd_ctl *pc, int force);
void ptlrpcd_free(struct ptlrpcd_ctl *pc);
void ptlrpcd_wake(struct ptlrpc_request *req);
void ptlrpcd_add_req(struct ptlrpc_request *req);
int ptlrpcd_addref(void);
void ptlrpcd_decref(void);
/* ptlrpc/lproc_ptlrpc.c */
/**
* procfs output related functions
* @{
*/
const char *ll_opcode2str(__u32 opcode);
int ll_str2opcode(const char *ops);
#ifdef CONFIG_PROC_FS
void ptlrpc_lprocfs_register_obd(struct obd_device *obd);
void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd);
void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int bytes);
#else
static inline void ptlrpc_lprocfs_register_obd(struct obd_device *obd) {}
static inline void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd) {}
static inline void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int bytes) {}
#endif
/** @} */
/* ptlrpc/llog_server.c */
int llog_origin_handle_open(struct ptlrpc_request *req);
int llog_origin_handle_prev_block(struct ptlrpc_request *req);
int llog_origin_handle_next_block(struct ptlrpc_request *req);
int llog_origin_handle_read_header(struct ptlrpc_request *req);
/* ptlrpc/llog_client.c */
extern const struct llog_operations llog_client_ops;
/** @} net */
#endif
/** @} PtlRPC */
