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/*
* Copyright (c) 2012-2018 General Dynamics
* Copyright (c) 2014 Open Kernel Labs, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#if !defined(VSERVICES_SERVER_BLOCK)
#define VSERVICES_SERVER_BLOCK
struct vs_service_device;
struct vs_server_block_state;
struct vs_server_block {
/*
* If set to false then the receive message handlers are run from
* workqueue context and are allowed to sleep. If set to true the
* message handlers are run from tasklet context and may not sleep.
*/
bool rx_atomic;
/*
* If this is set to true along with rx_atomic, the driver is allowed
* to send messages from softirq contexts other than the receive
* message handlers, after calling vs_service_state_lock_bh. Otherwise,
* messages may only be sent from the receive message handlers, or
* from task context after calling vs_service_state_lock. This must
* not be set to true if rx_atomic is set to false.
*/
bool tx_atomic;
/*
* These are the driver's recommended message quotas. They are used
* by the core service to select message quotas for services with no
* explicitly configured quotas.
*/
u32 in_quota_best;
u32 out_quota_best;
/** session setup **/
struct vs_server_block_state *(*alloc) (struct vs_service_device *
service);
void (*release) (struct vs_server_block_state * _state);
struct vs_service_driver *driver;
/** Open, reopen, close and closed functions **/
vs_server_response_type_t(*open) (struct vs_server_block_state *
_state);
vs_server_response_type_t(*reopen) (struct vs_server_block_state *
_state);
vs_server_response_type_t(*close) (struct vs_server_block_state *
_state);
void (*closed) (struct vs_server_block_state * _state);
/** Send/receive state callbacks **/
int (*tx_ready) (struct vs_server_block_state * _state);
struct {
int (*req_read) (struct vs_server_block_state * _state,
uint32_t _opaque, uint64_t sector_index,
uint32_t num_sects, bool nodelay, bool flush);
int (*req_write) (struct vs_server_block_state * _state,
uint32_t _opaque, uint64_t sector_index,
uint32_t num_sects, bool nodelay, bool flush,
bool commit, struct vs_pbuf data,
struct vs_mbuf * _mbuf);
} io;
};
struct vs_server_block_state {
vservice_block_state_t state;
bool readonly;
uint32_t sector_size;
uint32_t segment_size;
uint64_t device_sectors;
bool flushable;
bool committable;
struct {
uint32_t sector_size;
uint32_t segment_size;
} io;
struct vs_service_device *service;
bool released;
};
/** Complete calls for server core functions **/
extern int vs_server_block_open_complete(struct vs_server_block_state *_state,
vs_server_response_type_t resp);
extern int vs_server_block_close_complete(struct vs_server_block_state *_state,
vs_server_response_type_t resp);
extern int vs_server_block_reopen_complete(struct vs_server_block_state *_state,
vs_server_response_type_t resp);
/** interface block_io **/
/* command parallel read */
extern struct vs_mbuf *vs_server_block_io_alloc_ack_read(struct
vs_server_block_state
*_state,
struct vs_pbuf *data,
gfp_t flags);
extern int vs_server_block_io_free_ack_read(struct vs_server_block_state
*_state, struct vs_pbuf *data,
struct vs_mbuf *_mbuf);
extern int vs_server_block_io_send_ack_read(struct vs_server_block_state
*_state, uint32_t _opaque,
struct vs_pbuf data,
struct vs_mbuf *_mbuf);
extern int vs_server_block_io_send_nack_read(struct vs_server_block_state
*_state, uint32_t _opaque,
vservice_block_block_io_error_t
err, gfp_t flags);
/* command parallel write */
extern int vs_server_block_io_getbufs_req_write(struct vs_server_block_state
*_state, struct vs_pbuf *data,
struct vs_mbuf *_mbuf);
extern int vs_server_block_io_free_req_write(struct vs_server_block_state
*_state, struct vs_pbuf *data,
struct vs_mbuf *_mbuf);
extern int vs_server_block_io_send_ack_write(struct vs_server_block_state
*_state, uint32_t _opaque,
gfp_t flags);
extern int vs_server_block_io_send_nack_write(struct vs_server_block_state
*_state, uint32_t _opaque,
vservice_block_block_io_error_t
err, gfp_t flags);
static inline bool vs_server_block_io_send_ack_read_is_pending(struct
vs_server_block_state
*_state)
{
return !bitmap_empty(_state->state.io.read_bitmask,
VSERVICE_BLOCK_IO_READ_MAX_PENDING);
}
static inline bool vs_server_block_io_send_ack_write_is_pending(struct
vs_server_block_state
*_state)
{
return !bitmap_empty(_state->state.io.write_bitmask,
VSERVICE_BLOCK_IO_WRITE_MAX_PENDING);
}
/** Module registration **/
struct module;
extern int __vservice_block_server_register(struct vs_server_block *server,
const char *name,
struct module *owner);
static inline int vservice_block_server_register(struct vs_server_block *server,
const char *name)
{
#ifdef MODULE
extern struct module __this_module;
struct module *this_module = &__this_module;
#else
struct module *this_module = NULL;
#endif
return __vservice_block_server_register(server, name, this_module);
}
extern int vservice_block_server_unregister(struct vs_server_block *server);
#endif /* ! VSERVICES_SERVER_BLOCK */
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