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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* * linux/drivers/acorn/scsi/queue.h: queue handling * * Copyright (C) 1997 Russell King * * 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. */ #ifndef QUEUE_H #define QUEUE_H typedef struct { struct list_head head; struct list_head free; spinlock_t queue_lock; void *alloc; /* start of allocated mem */ } Queue_t; /* * Function: void queue_initialise (Queue_t *queue) * Purpose : initialise a queue * Params : queue - queue to initialise */ extern int queue_initialise (Queue_t *queue); /* * Function: void queue_free (Queue_t *queue) * Purpose : free a queue * Params : queue - queue to free */ extern void queue_free (Queue_t *queue); /* * Function: Scsi_Cmnd *queue_remove (queue) * Purpose : removes first SCSI command from a queue * Params : queue - queue to remove command from * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available */ extern Scsi_Cmnd *queue_remove (Queue_t *queue); /* * Function: Scsi_Cmnd *queue_remove_exclude_ref (queue, exclude) * Purpose : remove a SCSI command from a queue * Params : queue - queue to remove command from * exclude - array of busy LUNs * Returns : Scsi_Cmnd if successful (and a reference), or NULL if no command available */ extern Scsi_Cmnd *queue_remove_exclude (Queue_t *queue, unsigned long *exclude); #define queue_add_cmd_ordered(queue,SCpnt) \ __queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE) #define queue_add_cmd_tail(queue,SCpnt) \ __queue_add(queue,SCpnt,0) /* * Function: int __queue_add(Queue_t *queue, Scsi_Cmnd *SCpnt, int head) * Purpose : Add a new command onto a queue * Params : queue - destination queue * SCpnt - command to add * head - add command to head of queue * Returns : 0 on error, !0 on success */ extern int __queue_add(Queue_t *queue, Scsi_Cmnd *SCpnt, int head); /* * Function: Scsi_Cmnd *queue_remove_tgtluntag (queue, target, lun, tag) * Purpose : remove a SCSI command from the queue for a specified target/lun/tag * Params : queue - queue to remove command from * target - target that we want * lun - lun on device * tag - tag on device * Returns : Scsi_Cmnd if successful, or NULL if no command satisfies requirements */ extern Scsi_Cmnd *queue_remove_tgtluntag (Queue_t *queue, int target, int lun, int tag); /* * Function: queue_remove_all_target(queue, target) * Purpose : remove all SCSI commands from the queue for a specified target * Params : queue - queue to remove command from * target - target device id * Returns : nothing */ extern void queue_remove_all_target(Queue_t *queue, int target); /* * Function: int queue_probetgtlun (queue, target, lun) * Purpose : check to see if we have a command in the queue for the specified * target/lun. * Params : queue - queue to look in * target - target we want to probe * lun - lun on target * Returns : 0 if not found, != 0 if found */ extern int queue_probetgtlun (Queue_t *queue, int target, int lun); /* * Function: int queue_remove_cmd (Queue_t *queue, Scsi_Cmnd *SCpnt) * Purpose : remove a specific command from the queues * Params : queue - queue to look in * SCpnt - command to find * Returns : 0 if not found */ int queue_remove_cmd(Queue_t *queue, Scsi_Cmnd *SCpnt); #endif /* QUEUE_H */ |