ctl_io.h

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2003 Silicon Graphics International Corp.
 * Copyright (c) 2014-2015 Alexander Motin <mav@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_io.h#5 $
 * $FreeBSD$
 */
/*
 * CAM Target Layer data movement structures/interface.
 *
 * Author: Ken Merry <ken@FreeBSD.org>
 */
 
#ifndef _CTL_IO_H_
#define _CTL_IO_H_
 
#ifndef _KERNEL
#include <stdbool.h>
#endif
 
#define CTL_MAX_CDBLEN  32
/*
 * Uncomment this next line to enable printing out times for I/Os
 * that take longer than CTL_TIME_IO_SECS seconds to get to the datamove
 * and/or done stage.
 */
#define CTL_TIME_IO
#ifdef  CTL_TIME_IO
#define CTL_TIME_IO_DEFAULT_SECS        90
#endif
 
/*
 * Uncomment this next line to enable the CTL I/O delay feature.  You
 * can delay I/O at two different points -- datamove and done.  This is
 * useful for diagnosing abort conditions (for hosts that send an abort on a
 * timeout), and for determining how long a host's timeout is.
 */
//#define       CTL_IO_DELAY
 
typedef enum {
        CTL_STATUS_NONE,        /* No status */
        CTL_SUCCESS,            /* Transaction completed successfully */
        CTL_CMD_TIMEOUT,        /* Command timed out, shouldn't happen here */
        CTL_SEL_TIMEOUT,        /* Selection timeout, shouldn't happen here */
        CTL_ERROR,              /* General CTL error XXX expand on this? */
        CTL_SCSI_ERROR,         /* SCSI error, look at status byte/sense data */
        CTL_CMD_ABORTED,        /* Command aborted, don't return status */
        CTL_STATUS_MASK = 0xfff,/* Mask off any status flags */
        CTL_AUTOSENSE = 0x1000  /* Autosense performed */
} ctl_io_status;
 
/*
 * WARNING:  Keep the data in/out/none flags where they are.  They're used
 * in conjunction with ctl_cmd_flags.  See comment above ctl_cmd_flags
 * definition in ctl_private.h.
 */
typedef enum {
        CTL_FLAG_NONE           = 0x00000000,   /* no flags */
        CTL_FLAG_DATA_IN        = 0x00000001,   /* DATA IN */
        CTL_FLAG_DATA_OUT       = 0x00000002,   /* DATA OUT */
        CTL_FLAG_DATA_NONE      = 0x00000003,   /* no data */
        CTL_FLAG_DATA_MASK      = 0x00000003,
        CTL_FLAG_DO_AUTOSENSE   = 0x00000020,   /* grab sense info */
        CTL_FLAG_USER_REQ       = 0x00000040,   /* request came from userland */
        CTL_FLAG_ALLOCATED      = 0x00000100,   /* data space allocated */
        CTL_FLAG_ABORT_STATUS   = 0x00000400,   /* return TASK ABORTED status */
        CTL_FLAG_ABORT          = 0x00000800,   /* this I/O should be aborted */
        CTL_FLAG_DMA_INPROG     = 0x00001000,   /* DMA in progress */
        CTL_FLAG_DELAY_DONE     = 0x00004000,   /* delay injection done */
        CTL_FLAG_INT_COPY       = 0x00008000,   /* internal copy, no done call*/
        CTL_FLAG_SENT_2OTHER_SC = 0x00010000,
        CTL_FLAG_FROM_OTHER_SC  = 0x00020000,
        CTL_FLAG_IS_WAS_ON_RTR  = 0x00040000,   /* Don't rerun cmd on failover*/
        CTL_FLAG_BUS_ADDR       = 0x00080000,   /* ctl_sglist contains BUS
                                                   addresses, not virtual ones*/
        CTL_FLAG_IO_CONT        = 0x00100000,   /* Continue I/O instead of
                                                   completing */
#if 0
        CTL_FLAG_ALREADY_DONE   = 0x00200000    /* I/O already completed */
#endif
        CTL_FLAG_NO_DATAMOVE    = 0x00400000,
        CTL_FLAG_DMA_QUEUED     = 0x00800000,   /* DMA queued but not started*/
        CTL_FLAG_STATUS_QUEUED  = 0x01000000,   /* Status queued but not sent*/
 
        CTL_FLAG_FAILOVER       = 0x04000000,   /* Killed by a failover */
        CTL_FLAG_IO_ACTIVE      = 0x08000000,   /* I/O active on this SC */
        CTL_FLAG_STATUS_SENT    = 0x10000000,   /* Status sent by datamove */
        CTL_FLAG_SERSEQ_DONE    = 0x20000000    /* All storage I/O started */
} ctl_io_flags;
 
struct ctl_lba_len {
        uint64_t lba;
        uint32_t len;
};
 
struct ctl_lba_len_flags {
        uint64_t lba;
        uint32_t len;
        uint32_t flags;
#define CTL_LLF_FUA     0x04000000
#define CTL_LLF_DPO     0x08000000
#define CTL_LLF_READ    0x10000000
#define CTL_LLF_WRITE   0x20000000
#define CTL_LLF_VERIFY  0x40000000
#define CTL_LLF_COMPARE 0x80000000
};
 
struct ctl_ptr_len_flags {
        uint8_t         *ptr;
        uint32_t        len;
        uint32_t        flags;
};
 
union ctl_priv {
        uint8_t         bytes[sizeof(uint64_t) * 2];
        uint64_t        integer;
        uint64_t        integers[2];
        void            *ptr;
        void            *ptrs[2];
};
 
/*
 * Number of CTL private areas.
 */
#define CTL_NUM_PRIV    6
 
/*
 * Which private area are we using for a particular piece of data?
 */
#define CTL_PRIV_LUN            0       /* CTL LUN pointer goes here */
#define CTL_PRIV_LBA_LEN        1       /* Decoded LBA/len for read/write*/
#define CTL_PRIV_MODEPAGE       1       /* Modepage info for config write */
#define CTL_PRIV_BACKEND        2       /* Reserved for block, RAIDCore */
#define CTL_PRIV_BACKEND_LUN    3       /* Backend LUN pointer */
#define CTL_PRIV_FRONTEND       4       /* Frontend storage */
#define CTL_PRIV_FRONTEND2      5       /* Another frontend storage */
 
#define CTL_LUN(io)     ((io)->io_hdr.ctl_private[CTL_PRIV_LUN].ptrs[0])
#define CTL_SOFTC(io)   ((io)->io_hdr.ctl_private[CTL_PRIV_LUN].ptrs[1])
#define CTL_BACKEND_LUN(io)     ((io)->io_hdr.ctl_private[CTL_PRIV_BACKEND_LUN].ptrs[0])
#define CTL_PORT(io)    (((struct ctl_softc *)CTL_SOFTC(io))->  \
    ctl_ports[(io)->io_hdr.nexus.targ_port])
 
/*
 * These are used only on Originating SC in XFER mode, where requests don't
 * ever reach backends, so we can reuse backend's private storage.
 */
#define CTL_RSGL(io)    ((io)->io_hdr.ctl_private[CTL_PRIV_BACKEND].ptrs[0])
#define CTL_LSGL(io)    ((io)->io_hdr.ctl_private[CTL_PRIV_BACKEND].ptrs[1])
#define CTL_RSGLT(io)   ((struct ctl_sg_entry *)CTL_RSGL(io))
#define CTL_LSGLT(io)   ((struct ctl_sg_entry *)CTL_LSGL(io))
 
#define CTL_INVALID_PORTNAME 0xFF
#define CTL_UNMAPPED_IID     0xFF
 
struct ctl_sg_entry {
        void    *addr;
        size_t  len;
};
 
typedef enum {
        CTL_IO_NONE,
        CTL_IO_SCSI,
        CTL_IO_TASK,
} ctl_io_type;
 
struct ctl_nexus {
        uint32_t initid;                /* Initiator ID */
        uint32_t targ_port;             /* Target port, filled in by PORT */
        uint32_t targ_lun;              /* Destination lun */
        uint32_t targ_mapped_lun;       /* Destination lun CTL-wide */
};
 
typedef enum {
        CTL_MSG_SERIALIZE,
        CTL_MSG_R2R,
        CTL_MSG_FINISH_IO,
        CTL_MSG_BAD_JUJU,
        CTL_MSG_MANAGE_TASKS,
        CTL_MSG_PERS_ACTION,
        CTL_MSG_DATAMOVE,
        CTL_MSG_DATAMOVE_DONE,
        CTL_MSG_UA,                     /* Set/clear UA on secondary. */
        CTL_MSG_PORT_SYNC,              /* Information about port. */
        CTL_MSG_LUN_SYNC,               /* Information about LUN. */
        CTL_MSG_IID_SYNC,               /* Information about initiator. */
        CTL_MSG_LOGIN,                  /* Information about HA peer. */
        CTL_MSG_MODE_SYNC,              /* Mode page current content. */
        CTL_MSG_FAILOVER                /* Fake, never sent though the wire */
} ctl_msg_type;
 
struct ctl_scsiio;
 
struct ctl_io_hdr {
        uint32_t          version;      /* interface version XXX */
        ctl_io_type       io_type;      /* task I/O, SCSI I/O, etc. */
        ctl_msg_type      msg_type;
        struct ctl_nexus  nexus;        /* Initiator, port, target, lun */
        uint32_t          iid_indx;     /* the index into the iid mapping */
        uint32_t          flags;        /* transaction flags */
        uint32_t          status;       /* transaction status */
        uint32_t          port_status;  /* trans status, set by PORT, 0 = good*/
        uint32_t          timeout;      /* timeout in ms */
        uint32_t          retries;      /* retry count */
#ifdef CTL_IO_DELAY
        struct callout    delay_callout;
#endif /* CTL_IO_DELAY */
#ifdef CTL_TIME_IO
        time_t            start_time;   /* I/O start time */
        struct bintime    start_bt;     /* Timer start ticks */
        struct bintime    dma_start_bt; /* DMA start ticks */
        struct bintime    dma_bt;       /* DMA total ticks */
#endif /* CTL_TIME_IO */
        uint32_t          num_dmas;     /* Number of DMAs */
        union ctl_io      *remote_io;   /* I/O counterpart on remote HA side */
        union ctl_io      *blocker;     /* I/O blocking this one */
        void              *pool;        /* I/O pool */
        union ctl_priv    ctl_private[CTL_NUM_PRIV];/* CTL private area */
        TAILQ_HEAD(, ctl_io_hdr) blocked_queue; /* I/Os blocked by this one */
        STAILQ_ENTRY(ctl_io_hdr) links; /* linked list pointer */
        LIST_ENTRY(ctl_io_hdr) ooa_links;       /* ooa_queue links */
        TAILQ_ENTRY(ctl_io_hdr) blocked_links;  /* blocked_queue links */
};
 
typedef enum {
        CTL_TAG_UNTAGGED,
        CTL_TAG_SIMPLE,
        CTL_TAG_ORDERED,
        CTL_TAG_HEAD_OF_QUEUE,
        CTL_TAG_ACA
} ctl_tag_type;
 
union ctl_io;
 
typedef void (*ctl_ref)(void *arg, int diff);
 
/*
 * SCSI passthrough I/O structure for the CAM Target Layer.  Note
 * that some of these fields are here for completeness, but they aren't
 * used in the CTL implementation.  e.g., timeout and retries won't be
 * used.
 *
 * Note:  Make sure the io_hdr is *always* the first element in this
 * structure.
 */
struct ctl_scsiio {
        struct ctl_io_hdr io_hdr;       /* common to all I/O types */
 
        /*
         * The ext_* fields are generally intended for frontend use; CTL itself
         * doesn't modify or use them.
         */
        uint32_t   ext_sg_entries;      /* 0 = no S/G list, > 0 = num entries */
        uint8_t    *ext_data_ptr;       /* data buffer or S/G list */
        uint32_t   ext_data_len;        /* Data transfer length */
        uint32_t   ext_data_filled;     /* Amount of data filled so far */
 
        /*
         * The number of scatter/gather entries in the list pointed to
         * by kern_data_ptr.  0 means there is no list, just a data pointer.
         */
        uint32_t   kern_sg_entries;
 
        uint32_t   rem_sg_entries;      /* Unused. */
 
        /*
         * The data pointer or a pointer to the scatter/gather list.
         */
        uint8_t    *kern_data_ptr;
 
        /*
         * Length of the data buffer or scatter/gather list.  It's also
         * the length of this particular piece of the data transfer,
         * ie. number of bytes expected to be transferred by the current
         * invocation of frontend's datamove() callback.  It's always
         * less than or equal to kern_total_len.
         */
        uint32_t   kern_data_len;
 
        /*
         * Total length of data to be transferred during this particular
         * SCSI command, as decoded from SCSI CDB.
         */
        uint32_t   kern_total_len;
 
        /*
         * Amount of data left after the current data transfer.
         */
        uint32_t   kern_data_resid;
 
        /*
         * Byte offset of this transfer, equal to the amount of data
         * already transferred for this SCSI command during previous
         * datamove() invocations.
         */
        uint32_t   kern_rel_offset;
 
        struct     scsi_sense_data sense_data;  /* sense data */
        uint8_t    sense_len;           /* Returned sense length */
        uint8_t    scsi_status;         /* SCSI status byte */
        uint8_t    seridx;              /* Serialization index. */
        uint8_t    priority;            /* Command priority */
        uint32_t   residual;            /* Unused */
        uint32_t   tag_num;             /* tag number */
        ctl_tag_type tag_type;          /* simple, ordered, head of queue,etc.*/
        uint8_t    cdb_len;             /* CDB length */
        uint8_t    cdb[CTL_MAX_CDBLEN]; /* CDB */
        int        (*be_move_done)(union ctl_io *io, bool samethr); /* called by fe */
        int        (*io_cont)(union ctl_io *io); /* to continue processing */
        ctl_ref     kern_data_ref;      /* Method to reference/release data */
        void       *kern_data_arg;      /* Opaque argument for kern_data_ref() */
};
 
typedef enum {
        CTL_TASK_ABORT_TASK,
        CTL_TASK_ABORT_TASK_SET,
        CTL_TASK_CLEAR_ACA,
        CTL_TASK_CLEAR_TASK_SET,
        CTL_TASK_I_T_NEXUS_RESET,
        CTL_TASK_LUN_RESET,
        CTL_TASK_TARGET_RESET,
        CTL_TASK_BUS_RESET,
        CTL_TASK_PORT_LOGIN,
        CTL_TASK_PORT_LOGOUT,
        CTL_TASK_QUERY_TASK,
        CTL_TASK_QUERY_TASK_SET,
        CTL_TASK_QUERY_ASYNC_EVENT
} ctl_task_type;
 
typedef enum {
        CTL_TASK_FUNCTION_COMPLETE,
        CTL_TASK_FUNCTION_SUCCEEDED,
        CTL_TASK_FUNCTION_REJECTED,
        CTL_TASK_LUN_DOES_NOT_EXIST,
        CTL_TASK_FUNCTION_NOT_SUPPORTED
} ctl_task_status;
 
/*
 * Task management I/O structure.  Aborts, bus resets, etc., are sent using
 * this structure.
 *
 * Note:  Make sure the io_hdr is *always* the first element in this
 * structure.
 */
struct ctl_taskio {
        struct ctl_io_hdr       io_hdr;      /* common to all I/O types */
        ctl_task_type           task_action; /* Target Reset, Abort, etc.  */
        uint32_t                tag_num;     /* tag number */
        ctl_tag_type            tag_type;    /* simple, ordered, etc. */
        uint8_t                 task_status; /* Complete, Succeeded, etc. */
        uint8_t                 task_resp[3];/* Response information */
};
 
/*
 * HA link messages.
 */
#define CTL_HA_VERSION          3
 
/*
 * Used for CTL_MSG_LOGIN.
 */
struct ctl_ha_msg_login {
        ctl_msg_type            msg_type;
        int                     version;
        int                     ha_mode;
        int                     ha_id;
        int                     max_luns;
        int                     max_ports;
        int                     max_init_per_port;
};
 
typedef enum {
        CTL_PR_REG_KEY,
        CTL_PR_UNREG_KEY,
        CTL_PR_PREEMPT,
        CTL_PR_CLEAR,
        CTL_PR_RESERVE,
        CTL_PR_RELEASE
} ctl_pr_action;
 
/*
 * The PR info is specifically for sending Persistent Reserve actions
 * to the other SC which it must also act on.
 *
 * Note:  Make sure the io_hdr is *always* the first element in this
 * structure.
 */
struct ctl_pr_info {
        ctl_pr_action           action;
        uint8_t                 sa_res_key[8];
        uint8_t                 res_type;
        uint32_t                residx;
};
 
struct ctl_ha_msg_hdr {
        ctl_msg_type            msg_type;
        uint32_t                status;      /* transaction status */
        union ctl_io            *original_sc;
        union ctl_io            *serializing_sc;
        struct ctl_nexus        nexus;       /* Initiator, port, target, lun */
};
 
#define CTL_HA_MAX_SG_ENTRIES   16
#define CTL_HA_DATAMOVE_SEGMENT 131072
 
/*
 * Used for CTL_MSG_PERS_ACTION.
 */
struct ctl_ha_msg_pr {
        struct ctl_ha_msg_hdr   hdr;
        struct ctl_pr_info      pr_info;
};
 
/*
 * Used for CTL_MSG_UA.
 */
struct ctl_ha_msg_ua {
        struct ctl_ha_msg_hdr   hdr;
        int                     ua_all;
        int                     ua_set;
        int                     ua_type;
        uint8_t                 ua_info[8];
};
 
/*
 * The S/G handling here is a little different than the standard ctl_scsiio
 * structure, because we can't pass data by reference in between controllers.
 * The S/G list in the ctl_scsiio struct is normally passed in the
 * kern_data_ptr field.  So kern_sg_entries here will always be non-zero,
 * even if there is only one entry.
 *
 * Used for CTL_MSG_DATAMOVE.
 */
struct ctl_ha_msg_dt {
        struct ctl_ha_msg_hdr   hdr;
        ctl_io_flags            flags;  /* Only I/O flags are used here */
        uint32_t                sg_sequence;     /* S/G portion number  */
        uint8_t                 sg_last;         /* last S/G batch = 1 */
        uint32_t                sent_sg_entries; /* previous S/G count */
        uint32_t                cur_sg_entries;  /* current S/G entries */
        uint32_t                kern_sg_entries; /* total S/G entries */
        uint32_t                kern_data_len;   /* Length of this S/G list */
        uint32_t                kern_total_len;  /* Total length of this
                                                    transaction */
        uint32_t                kern_data_resid; /* Length left to transfer
                                                    after this*/
        uint32_t                kern_rel_offset; /* Byte Offset of this
                                                    transfer */
        struct ctl_sg_entry     sg_list[CTL_HA_MAX_SG_ENTRIES];
};
 
/*
 * Used for CTL_MSG_SERIALIZE, CTL_MSG_FINISH_IO, CTL_MSG_BAD_JUJU,
 * and CTL_MSG_DATAMOVE_DONE.
 */
struct ctl_ha_msg_scsi {
        struct ctl_ha_msg_hdr   hdr;
        uint32_t                tag_num;     /* tag number */
        ctl_tag_type            tag_type;    /* simple, ordered, etc. */
        uint8_t                 cdb[CTL_MAX_CDBLEN];    /* CDB */
        uint8_t                 cdb_len;        /* CDB length */
        uint8_t                 scsi_status; /* SCSI status byte */
        uint8_t                 sense_len;   /* Returned sense length */
        uint8_t                 priority;    /* Command priority */
        uint32_t                port_status; /* trans status, set by FETD,
                                                0 = good*/
        uint32_t                kern_data_resid; /* for DATAMOVE_DONE */
        struct scsi_sense_data  sense_data;  /* sense data */
};
 
/* 
 * Used for CTL_MSG_MANAGE_TASKS.
 */
struct ctl_ha_msg_task {
        struct ctl_ha_msg_hdr   hdr;
        ctl_task_type           task_action; /* Target Reset, Abort, etc.  */
        uint32_t                tag_num;     /* tag number */
        ctl_tag_type            tag_type;    /* simple, ordered, etc. */
};
 
/*
 * Used for CTL_MSG_PORT_SYNC.
 */
struct ctl_ha_msg_port {
        struct ctl_ha_msg_hdr   hdr;
        int                     port_type;
        int                     physical_port;
        int                     virtual_port;
        int                     status;
        int                     name_len;
        int                     lun_map_len;
        int                     port_devid_len;
        int                     target_devid_len;
        int                     init_devid_len;
        uint8_t                 data[];
};
 
/*
 * Used for CTL_MSG_LUN_SYNC.
 */
struct ctl_ha_msg_lun {
        struct ctl_ha_msg_hdr   hdr;
        int                     flags;
        unsigned int            pr_generation;
        uint32_t                pr_res_idx;
        uint8_t                 pr_res_type;
        int                     lun_devid_len;
        int                     pr_key_count;
        uint8_t                 data[];
};
 
struct ctl_ha_msg_lun_pr_key {
        uint32_t                pr_iid;
        uint64_t                pr_key;
};
 
/*
 * Used for CTL_MSG_IID_SYNC.
 */
struct ctl_ha_msg_iid {
        struct ctl_ha_msg_hdr   hdr;
        int                     in_use;
        int                     name_len;
        uint64_t                wwpn;
        uint8_t                 data[];
};
 
/*
 * Used for CTL_MSG_MODE_SYNC.
 */
struct ctl_ha_msg_mode {
        struct ctl_ha_msg_hdr   hdr;
        uint8_t                 page_code;
        uint8_t                 subpage;
        uint16_t                page_len;
        uint8_t                 data[];
};
 
union ctl_ha_msg {
        struct ctl_ha_msg_hdr   hdr;
        struct ctl_ha_msg_task  task;
        struct ctl_ha_msg_scsi  scsi;
        struct ctl_ha_msg_dt    dt;
        struct ctl_ha_msg_pr    pr;
        struct ctl_ha_msg_ua    ua;
        struct ctl_ha_msg_port  port;
        struct ctl_ha_msg_lun   lun;
        struct ctl_ha_msg_iid   iid;
        struct ctl_ha_msg_login login;
        struct ctl_ha_msg_mode  mode;
};
 
struct ctl_prio {
        struct ctl_io_hdr       io_hdr;
        struct ctl_ha_msg_pr    pr_msg;
};
 
union ctl_io {
        struct ctl_io_hdr       io_hdr; /* common to all I/O types */
        struct ctl_scsiio       scsiio; /* Normal SCSI commands */
        struct ctl_taskio       taskio; /* SCSI task management/reset */
        struct ctl_prio         presio; /* update per. res info on other SC */
};
 
#ifdef _KERNEL
 
union ctl_io *ctl_alloc_io(void *pool_ref);
union ctl_io *ctl_alloc_io_nowait(void *pool_ref);
void ctl_free_io(union ctl_io *io);
void ctl_zero_io(union ctl_io *io);
 
#endif /* _KERNEL */
 
#endif  /* _CTL_IO_H_ */
 
/*
 * vim: ts=8
 */