1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef _LINUX_BLKDEV_H 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define _LINUX_BLKDEV_H 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/major.h> 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/genhd.h> 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/list.h> 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/timer.h> 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/workqueue.h> 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/pagemap.h> 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/backing-dev.h> 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/wait.h> 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/mempool.h> 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/bio.h> 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/module.h> 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/stringify.h> 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/scatterlist.h> 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct scsi_ioctl_command; 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request_queue; 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct request_queue request_queue_t; 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct elevator_queue; 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct elevator_queue elevator_t; 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request_pm_state; 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct blk_trace; 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKDEV_MIN_RQ 4 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKDEV_MAX_RQ 128 /* Default maximum */ 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is the per-process anticipatory I/O scheduler state. 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct as_io_context { 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t lock; 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*dtor)(struct as_io_context *aic); /* destructor */ 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*exit)(struct as_io_context *aic); /* called on task exit */ 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long state; 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t nr_queued; /* queued reads & sync writes */ 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t nr_dispatched; /* number of requests gone to the drivers */ 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* IO History tracking */ 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Thinktime */ 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long last_end_request; 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ttime_total; 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ttime_samples; 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ttime_mean; 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Layout pattern */ 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int seek_samples; 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t last_request_pos; 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru u64 seek_total; 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t seek_mean; 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct cfq_queue; 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct cfq_io_context { 59c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct rb_node rb_node; 60c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *key; 61c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 62c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct cfq_queue *cfqq[2]; 63c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 64c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct io_context *ioc; 65c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 66c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long last_end_request; 67c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t last_request_pos; 68c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long last_queue; 69c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 70c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ttime_total; 71c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ttime_samples; 72c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long ttime_mean; 73c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 74c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int seek_samples; 75c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru u64 seek_total; 76c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t seek_mean; 77c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 78c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head queue_list; 79c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 80c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*dtor)(struct io_context *); /* destructor */ 81c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void (*exit)(struct io_context *); /* called on task exit */ 82c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 83c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 84c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 85c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is the per-process I/O subsystem state. It is refcounted and 86c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * kmalloc'ed. Currently all fields are modified in process io context 87c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (apart from the atomic refcount), so require no locking. 88c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 89c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct io_context { 90c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t refcount; 91c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct task_struct *task; 92c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 93c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int (*set_ioprio)(struct io_context *, unsigned int); 94c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 95c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 96c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * For request batching 97c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 98c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long last_waited; /* Time last woken after wait for request */ 99c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int nr_batch_requests; /* Number of requests left in the batch */ 100c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 101c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct as_io_context *aic; 102c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct rb_root cic_root; 103c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 104c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 105c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid put_io_context(struct io_context *ioc); 106c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid exit_io_context(void); 107c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct io_context *current_io_context(gfp_t gfp_flags); 108c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct io_context *get_io_context(gfp_t gfp_flags); 109c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid copy_io_context(struct io_context **pdst, struct io_context **psrc); 110c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid swap_io_context(struct io_context **ioc1, struct io_context **ioc2); 111c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 112c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request; 113c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (rq_end_io_fn)(struct request *, int); 114c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 115c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request_list { 116c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int count[2]; 117c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int starved[2]; 118c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int elvpriv; 119c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru mempool_t *rq_pool; 120c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_head_t wait[2]; 121c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 122c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 123c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLK_MAX_CDB 16 124c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 125c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 126c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * try to put the fields that are referenced together in the same cacheline 127c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 128c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request { 129c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head queuelist; 130c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head donelist; 131c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 132c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long flags; /* see REQ_ bits below */ 133c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 134c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Maintain bio traversal state for part by part I/O submission. 135c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * hard_* are block layer internals, no driver should touch them! 136c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 137c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 138c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t sector; /* next sector to submit */ 139c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_sectors; /* no. of sectors left to submit */ 140c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* no. of sectors left to submit in the current segment */ 141c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int current_nr_sectors; 142c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 143c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t hard_sector; /* next sector to complete */ 144c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long hard_nr_sectors; /* no. of sectors left to complete */ 145c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* no. of sectors left to complete in the current segment */ 146c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int hard_cur_sectors; 147c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 148c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct bio *bio; 149c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct bio *biotail; 150c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 151c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *elevator_private; 152c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *completion_data; 153c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 154c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int rq_status; /* should split this into a few status bits */ 155c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int errors; 156c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct gendisk *rq_disk; 157c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long start_time; 158c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 159c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Number of scatter-gather DMA addr+len pairs after 160c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * physical address coalescing is performed. 161c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 162c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short nr_phys_segments; 163c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 164c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Number of scatter-gather addr+len pairs after 165c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * physical and DMA remapping hardware coalescing is performed. 166c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is the number of scatter-gather entries the driver 167c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * will actually have to deal with after DMA mapping is done. 168c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 169c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short nr_hw_segments; 170c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 171c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short ioprio; 172c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 173c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int tag; 174c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 175c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int ref_count; 176c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru request_queue_t *q; 177c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request_list *rl; 178c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 179c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct completion *waiting; 180c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *special; 181c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char *buffer; 182c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 183c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 184c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * when request is used as a packet command carrier 185c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 186c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int cmd_len; 187c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned char cmd[BLK_MAX_CDB]; 188c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 189c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int data_len; 190c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int sense_len; 191c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *data; 192c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *sense; 193c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 194c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int timeout; 195c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int retries; 196c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 197c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 198c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * completion callback. end_io_data should be folded in with waiting 199c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 200c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru rq_end_io_fn *end_io; 201c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *end_io_data; 202c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 203c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 204c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 205c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * first three bits match BIO_RW* bits, important 206c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 207c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum rq_flag_bits { 208c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_RW, /* not set, read. set, write */ 209c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_FAILFAST, /* no low level driver retries */ 210c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_SORTED, /* elevator knows about this request */ 211c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ 212c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_HARDBARRIER, /* may not be passed by drive either */ 213c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_FUA, /* forced unit access */ 214c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_CMD, /* is a regular fs rw request */ 215c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_NOMERGE, /* don't touch this for merging */ 216c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_STARTED, /* drive already may have started this one */ 217c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_DONTPREP, /* don't call prep for this one */ 218c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_QUEUED, /* uses queueing */ 219c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_ELVPRIV, /* elevator private data attached */ 220c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 221c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * for ATA/ATAPI devices 222c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 223c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_PC, /* packet command (special) */ 224c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_BLOCK_PC, /* queued down pc from block layer */ 225c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_SENSE, /* sense retrival */ 226c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 227c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_FAILED, /* set if the request failed */ 228c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_QUIET, /* don't worry about errors */ 229c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_SPECIAL, /* driver suplied command */ 230c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_DRIVE_CMD, 231c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_DRIVE_TASK, 232c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_DRIVE_TASKFILE, 233c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_PREEMPT, /* set for "ide_preempt" requests */ 234c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_PM_SUSPEND, /* suspend request */ 235c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_PM_RESUME, /* resume request */ 236c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_PM_SHUTDOWN, /* shutdown request */ 237c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_ORDERED_COLOR, /* is before or after barrier */ 238c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_RW_SYNC, /* request is sync (O_DIRECT) */ 239c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __REQ_NR_BITS, /* stops here */ 240c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 241c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 242c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_RW (1 << __REQ_RW) 243c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_FAILFAST (1 << __REQ_FAILFAST) 244c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_SORTED (1 << __REQ_SORTED) 245c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) 246c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) 247c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_FUA (1 << __REQ_FUA) 248c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_CMD (1 << __REQ_CMD) 249c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_NOMERGE (1 << __REQ_NOMERGE) 250c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_STARTED (1 << __REQ_STARTED) 251c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_DONTPREP (1 << __REQ_DONTPREP) 252c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_QUEUED (1 << __REQ_QUEUED) 253c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_ELVPRIV (1 << __REQ_ELVPRIV) 254c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_PC (1 << __REQ_PC) 255c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_BLOCK_PC (1 << __REQ_BLOCK_PC) 256c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_SENSE (1 << __REQ_SENSE) 257c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_FAILED (1 << __REQ_FAILED) 258c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_QUIET (1 << __REQ_QUIET) 259c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_SPECIAL (1 << __REQ_SPECIAL) 260c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_DRIVE_CMD (1 << __REQ_DRIVE_CMD) 261c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_DRIVE_TASK (1 << __REQ_DRIVE_TASK) 262c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_DRIVE_TASKFILE (1 << __REQ_DRIVE_TASKFILE) 263c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_PREEMPT (1 << __REQ_PREEMPT) 264c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_PM_SUSPEND (1 << __REQ_PM_SUSPEND) 265c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_PM_RESUME (1 << __REQ_PM_RESUME) 266c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN) 267c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) 268c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define REQ_RW_SYNC (1 << __REQ_RW_SYNC) 269c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 270c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 271c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * State information carried for REQ_PM_SUSPEND and REQ_PM_RESUME 272c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * requests. Some step values could eventually be made generic. 273c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 274c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request_pm_state 275c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 276c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* PM state machine step value, currently driver specific */ 277c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int pm_step; 278c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* requested PM state value (S1, S2, S3, S4, ...) */ 279c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru u32 pm_state; 280c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void* data; /* for driver use */ 281c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 282c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 283c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/elevator.h> 284c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 285c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (merge_request_fn) (request_queue_t *, struct request *, 286c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct bio *); 287c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (merge_requests_fn) (request_queue_t *, struct request *, 288c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *); 289c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (request_fn_proc) (request_queue_t *q); 290c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (make_request_fn) (request_queue_t *q, struct bio *bio); 291c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (prep_rq_fn) (request_queue_t *, struct request *); 292c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (unplug_fn) (request_queue_t *); 293c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 294c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct bio_vec; 295c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (merge_bvec_fn) (request_queue_t *, struct bio *, struct bio_vec *); 296c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (activity_fn) (void *data, int rw); 297c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *); 298c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (prepare_flush_fn) (request_queue_t *, struct request *); 299c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef void (softirq_done_fn)(struct request *); 300c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 301c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum blk_queue_state { 302c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru Queue_down, 303c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru Queue_up, 304c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 305c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 306c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct blk_queue_tag { 307c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request **tag_index; /* map of busy tags */ 308c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long *tag_map; /* bit map of free/busy tags */ 309c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head busy_list; /* fifo list of busy tags */ 310c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int busy; /* current depth */ 311c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int max_depth; /* what we will send to device */ 312c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int real_max_depth; /* what the array can hold */ 313c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t refcnt; /* map can be shared */ 314c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 315c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 316c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct request_queue 317c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 318c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 319c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Together with queue_head for cacheline sharing 320c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 321c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head queue_head; 322c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *last_merge; 323c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru elevator_t *elevator; 324c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 325c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 326c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the queue request freelist, one for reads and one for writes 327c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 328c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request_list rq; 329c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 330c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru request_fn_proc *request_fn; 331c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru merge_request_fn *back_merge_fn; 332c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru merge_request_fn *front_merge_fn; 333c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru merge_requests_fn *merge_requests_fn; 334c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru make_request_fn *make_request_fn; 335c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru prep_rq_fn *prep_rq_fn; 336c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unplug_fn *unplug_fn; 337c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru merge_bvec_fn *merge_bvec_fn; 338c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru activity_fn *activity_fn; 339c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru issue_flush_fn *issue_flush_fn; 340c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru prepare_flush_fn *prepare_flush_fn; 341c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru softirq_done_fn *softirq_done_fn; 342c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 343c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 344c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Dispatch queue sorting 345c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 346c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru sector_t end_sector; 347c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *boundary_rq; 348c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 349c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 350c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Auto-unplugging state 351c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 352c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct timer_list unplug_timer; 353c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int unplug_thresh; /* After this many requests */ 354c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long unplug_delay; /* After this many jiffies */ 355c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct work_struct unplug_work; 356c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 357c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct backing_dev_info backing_dev_info; 358c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 359c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 360c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The queue owner gets to use this for whatever they like. 361c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ll_rw_blk doesn't touch it. 362c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 363c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *queuedata; 364c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 365c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void *activity_data; 366c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 367c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 368c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * queue needs bounce pages for pages above this limit 369c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 370c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long bounce_pfn; 371c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru gfp_t bounce_gfp; 372c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 373c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 374c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * various queue flags, see QUEUE_* below 375c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 376c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long queue_flags; 377c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 378c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 379c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * protects queue structures from reentrancy. ->__queue_lock should 380c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * _never_ be used directly, it is queue private. always use 381c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ->queue_lock. 382c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 383c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t __queue_lock; 384c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t *queue_lock; 385c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 386c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 387c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * queue kobject 388c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 389c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct kobject kobj; 390c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 391c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 392c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * queue settings 393c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 394c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_requests; /* Max # of requests */ 395c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int nr_congestion_on; 396c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int nr_congestion_off; 397c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int nr_batching; 398c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 399c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int max_sectors; 400c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int max_hw_sectors; 401c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short max_phys_segments; 402c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short max_hw_segments; 403c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned short hardsect_size; 404c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int max_segment_size; 405c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 406c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long seg_boundary_mask; 407c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int dma_alignment; 408c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 409c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct blk_queue_tag *queue_tags; 410c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 411c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int nr_sorted; 412c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int in_flight; 413c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 414c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 415c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * sg stuff 416c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 417c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int sg_timeout; 418c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int sg_reserved_size; 419c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int node; 420c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 421c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct blk_trace *blk_trace; 422c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 423c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 424c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * reserved for flush operations 425c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 426c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int ordered, next_ordered, ordseq; 427c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int orderr, ordcolor; 428c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request pre_flush_rq, bar_rq, post_flush_rq; 429c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *orig_bar_rq; 430c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int bi_size; 431c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 432c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct mutex sysfs_lock; 433c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 434c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 435c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RQ_INACTIVE (-1) 436c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RQ_ACTIVE 1 437c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 438c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ 439c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ 440c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ 441c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_READFULL 3 /* write queue has been filled */ 442c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_WRITEFULL 4 /* read queue has been filled */ 443c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_DEAD 5 /* queue being torn down */ 444c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ 445c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ 446c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ 447c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 448c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum { 449c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 450c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Hardbarrier is supported with one of the following methods. 451c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 452c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NONE : hardbarrier unsupported 453c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * DRAIN : ordering by draining is enough 454c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * DRAIN_FLUSH : ordering by draining w/ pre and post flushes 455c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * DRAIN_FUA : ordering by draining w/ pre flush and FUA write 456c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * TAG : ordering by tag is enough 457c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * TAG_FLUSH : ordering by tag w/ pre and post flushes 458c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * TAG_FUA : ordering by tag w/ pre flush and FUA write 459c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 460c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_NONE = 0x00, 461c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_DRAIN = 0x01, 462c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_TAG = 0x02, 463c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 464c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_PREFLUSH = 0x10, 465c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_POSTFLUSH = 0x20, 466c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_FUA = 0x40, 467c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 468c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | 469c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, 470c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | 471c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, 472c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | 473c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, 474c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | 475c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, 476c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 477c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 478c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Ordered operation sequence 479c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 480c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ 481c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ 482c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ 483c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ 484c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ 485c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru QUEUE_ORDSEQ_DONE = 0x20, 486c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 487c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 488c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) 489c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) 490c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 491c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_flushing(q) ((q)->ordseq) 492c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 493c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_fs_request(rq) ((rq)->flags & REQ_CMD) 494c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_pc_request(rq) ((rq)->flags & REQ_BLOCK_PC) 495c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_noretry_request(rq) ((rq)->flags & REQ_FAILFAST) 496c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_rq_started(rq) ((rq)->flags & REQ_STARTED) 497c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 498c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq)) 499c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 500c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_pm_suspend_request(rq) ((rq)->flags & REQ_PM_SUSPEND) 501c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_pm_resume_request(rq) ((rq)->flags & REQ_PM_RESUME) 502c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_pm_request(rq) \ 503c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ((rq)->flags & (REQ_PM_SUSPEND | REQ_PM_RESUME)) 504c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 505c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_sorted_rq(rq) ((rq)->flags & REQ_SORTED) 506c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_barrier_rq(rq) ((rq)->flags & REQ_HARDBARRIER) 507c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_fua_rq(rq) ((rq)->flags & REQ_FUA) 508c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 509c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 510c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 511c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define rq_data_dir(rq) ((rq)->flags & 1) 512c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 513c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int blk_queue_full(struct request_queue *q, int rw) 514c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 515c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (rw == READ) 516c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); 517c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); 518c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 519c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 520c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void blk_set_queue_full(struct request_queue *q, int rw) 521c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 522c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (rw == READ) 523c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru set_bit(QUEUE_FLAG_READFULL, &q->queue_flags); 524c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru else 525c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru set_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); 526c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 527c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 528c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void blk_clear_queue_full(struct request_queue *q, int rw) 529c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 530c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (rw == READ) 531c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru clear_bit(QUEUE_FLAG_READFULL, &q->queue_flags); 532c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru else 533c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru clear_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); 534c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 535c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 536c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 537c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 538c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may 539c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * it already be started by driver. 540c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 541c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define RQ_NOMERGE_FLAGS \ 542c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) 543c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define rq_mergeable(rq) \ 544c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (!((rq)->flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq))) 545c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 546c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 547c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * noop, requests are automagically marked as active/inactive by I/O 548c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * scheduler -- see elv_next_request 549c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 550c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_headactive(q, head_active) 551c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 552c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 553c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * q->prep_rq_fn return values 554c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 555c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKPREP_OK 0 /* serve it */ 556c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKPREP_KILL 1 /* fatal error, kill */ 557c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLKPREP_DEFER 2 /* leave on queue */ 558c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 559c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern unsigned long blk_max_low_pfn, blk_max_pfn; 560c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 561c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 562c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * standard bounce addresses: 563c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 564c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * BLK_BOUNCE_HIGH : bounce all highmem pages 565c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * BLK_BOUNCE_ANY : don't bounce anything 566c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 567c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 568c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 569c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT) 570c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) 571c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 572c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_MMU 573c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int init_emergency_isa_pool(void); 574c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_bounce(request_queue_t *q, struct bio **bio); 575c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 576c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int init_emergency_isa_pool(void) 577c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 578c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 579c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 580c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void blk_queue_bounce(request_queue_t *q, struct bio **bio) 581c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 582c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 583c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* CONFIG_MMU */ 584c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 585c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define rq_for_each_bio(_bio, rq) \ 586c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if ((rq->bio)) \ 587c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 588c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 589c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct sec_size { 590c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned block_size; 591c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned block_size_bits; 592c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 593c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 594c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_register_queue(struct gendisk *disk); 595c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_unregister_queue(struct gendisk *disk); 596c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void register_disk(struct gendisk *dev); 597c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void generic_make_request(struct bio *bio); 598c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_put_request(struct request *); 599c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __blk_put_request(request_queue_t *, struct request *); 600c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_end_sync_rq(struct request *rq, int error); 601c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct request *blk_get_request(request_queue_t *, int, gfp_t); 602c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_insert_request(request_queue_t *, struct request *, int, void *); 603c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_requeue_request(request_queue_t *, struct request *); 604c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_plug_device(request_queue_t *); 605c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_remove_plug(request_queue_t *); 606c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_recount_segments(request_queue_t *, struct bio *); 607c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int scsi_cmd_ioctl(struct file *, struct gendisk *, unsigned int, void __user *); 608c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int sg_scsi_ioctl(struct file *, struct request_queue *, 609c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct gendisk *, struct scsi_ioctl_command __user *); 610c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_start_queue(request_queue_t *q); 611c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_stop_queue(request_queue_t *q); 612c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_sync_queue(struct request_queue *q); 613c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __blk_stop_queue(request_queue_t *q); 614c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_run_queue(request_queue_t *); 615c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_activity_fn(request_queue_t *, activity_fn *, void *); 616c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_rq_map_user(request_queue_t *, struct request *, void __user *, unsigned int); 617c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_rq_unmap_user(struct bio *, unsigned int); 618c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_rq_map_kern(request_queue_t *, struct request *, void *, unsigned int, gfp_t); 619c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_rq_map_user_iov(request_queue_t *, struct request *, struct sg_iovec *, int); 620c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_execute_rq(request_queue_t *, struct gendisk *, 621c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *, int); 622c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *, 623c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *, int, rq_end_io_fn *); 624c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 625c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline request_queue_t *bdev_get_queue(struct block_device *bdev) 626c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 627c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return bdev->bd_disk->queue; 628c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 629c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 630c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void blk_run_backing_dev(struct backing_dev_info *bdi, 631c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct page *page) 632c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 633c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (bdi && bdi->unplug_io_fn) 634c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru bdi->unplug_io_fn(bdi, page); 635c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 636c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 637c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void blk_run_address_space(struct address_space *mapping) 638c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 639c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (mapping) 640c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru blk_run_backing_dev(mapping->backing_dev_info, NULL); 641c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 642c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 643c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 644c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * end_request() and friends. Must be called with the request queue spinlock 645c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * acquired. All functions called within end_request() _must_be_ atomic. 646c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 647c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Several drivers define their own end_request and call 648c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * end_that_request_first() and end_that_request_last() 649c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * for parts of the original function. This prevents 650c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * code duplication in drivers. 651c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 652c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int end_that_request_first(struct request *, int, int); 653c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int end_that_request_chunk(struct request *, int, int); 654c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void end_that_request_last(struct request *, int); 655c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void end_request(struct request *req, int uptodate); 656c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_complete_request(struct request *); 657c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 658c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int rq_all_done(struct request *rq, unsigned int nr_bytes) 659c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 660c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (blk_fs_request(rq)) 661c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (nr_bytes >= (rq->hard_nr_sectors << 9)); 662c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru else if (blk_pc_request(rq)) 663c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return nr_bytes >= rq->data_len; 664c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 665c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 666c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 667c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 668c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 669c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * end_that_request_first/chunk() takes an uptodate argument. we account 670c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * any value <= as an io error. 0 means -EIO for compatability reasons, 671c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * any other < 0 value is the direct error type. An uptodate value of 672c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 1 indicates successful io completion 673c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 674c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define end_io_error(uptodate) (unlikely((uptodate) <= 0)) 675c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 676c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void blkdev_dequeue_request(struct request *req) 677c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 678c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru elv_dequeue_request(req->q, req); 679c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 680c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 681c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 682c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This should be in elevator.h, but that requires pulling in rq and q 683c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 684c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void elv_dispatch_add_tail(struct request_queue *q, 685c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct request *rq) 686c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 687c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (q->last_merge == rq) 688c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru q->last_merge = NULL; 689c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru q->nr_sorted--; 690c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 691c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru q->end_sector = rq_end_sector(rq); 692c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru q->boundary_rq = rq; 693c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru list_add_tail(&rq->queuelist, &q->queue_head); 694c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 695c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 696c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 697c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Access functions for manipulating queue properties 698c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 699c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern request_queue_t *blk_init_queue_node(request_fn_proc *rfn, 700c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t *lock, int node_id); 701c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern request_queue_t *blk_init_queue(request_fn_proc *, spinlock_t *); 702c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_cleanup_queue(request_queue_t *); 703c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_make_request(request_queue_t *, make_request_fn *); 704c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_bounce_limit(request_queue_t *, u64); 705c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_max_sectors(request_queue_t *, unsigned int); 706c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_max_phys_segments(request_queue_t *, unsigned short); 707c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_max_hw_segments(request_queue_t *, unsigned short); 708c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_max_segment_size(request_queue_t *, unsigned int); 709c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_hardsect_size(request_queue_t *, unsigned short); 710c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_stack_limits(request_queue_t *t, request_queue_t *b); 711c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_segment_boundary(request_queue_t *, unsigned long); 712c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_prep_rq(request_queue_t *, prep_rq_fn *pfn); 713c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_merge_bvec(request_queue_t *, merge_bvec_fn *); 714c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_dma_alignment(request_queue_t *, int); 715c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_softirq_done(request_queue_t *, softirq_done_fn *); 716c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); 717c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_queue_ordered(request_queue_t *, unsigned, prepare_flush_fn *); 718c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *); 719c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_do_ordered(request_queue_t *, struct request **); 720c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern unsigned blk_ordered_cur_seq(request_queue_t *); 721c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern unsigned blk_ordered_req_seq(struct request *); 722c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_ordered_complete_seq(request_queue_t *, unsigned, int); 723c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 724c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *); 725c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_dump_rq_flags(struct request *, char *); 726c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void generic_unplug_device(request_queue_t *); 727c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void __generic_unplug_device(request_queue_t *); 728c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long nr_blockdev_pages(void); 729c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 730c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint blk_get_queue(request_queue_t *); 731c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querurequest_queue_t *blk_alloc_queue(gfp_t); 732c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querurequest_queue_t *blk_alloc_queue_node(gfp_t, int); 733c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_put_queue(request_queue_t *); 734c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 735c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 736c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * tag stuff 737c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 738c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_tag_depth(q) ((q)->queue_tags->busy) 739c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_queue_tag_queue(q) ((q)->queue_tags->busy < (q)->queue_tags->max_depth) 740c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_rq_tagged(rq) ((rq)->flags & REQ_QUEUED) 741c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_queue_start_tag(request_queue_t *, struct request *); 742c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct request *blk_queue_find_tag(request_queue_t *, int); 743c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_end_tag(request_queue_t *, struct request *); 744c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_queue_init_tags(request_queue_t *, int, struct blk_queue_tag *); 745c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_free_tags(request_queue_t *); 746c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blk_queue_resize_tags(request_queue_t *, int); 747c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_queue_invalidate_tags(request_queue_t *); 748c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern long blk_congestion_wait(int rw, long timeout); 749c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 750c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *); 751c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int blkdev_issue_flush(struct block_device *, sector_t *); 752c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 753c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_PHYS_SEGMENTS 128 754c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_HW_SEGMENTS 128 755c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SAFE_MAX_SECTORS 255 756c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define BLK_DEF_MAX_SECTORS 1024 757c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 758c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_SEGMENT_SIZE 65536 759c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 760c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) 761c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 762c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int queue_hardsect_size(request_queue_t *q) 763c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 764c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int retval = 512; 765c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 766c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (q && q->hardsect_size) 767c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru retval = q->hardsect_size; 768c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 769c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return retval; 770c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 771c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 772c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int bdev_hardsect_size(struct block_device *bdev) 773c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 774c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return queue_hardsect_size(bdev_get_queue(bdev)); 775c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 776c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 777c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int queue_dma_alignment(request_queue_t *q) 778c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 779c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int retval = 511; 780c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 781c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (q && q->dma_alignment) 782c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru retval = q->dma_alignment; 783c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 784c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return retval; 785c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 786c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 787c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int bdev_dma_aligment(struct block_device *bdev) 788c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 789c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return queue_dma_alignment(bdev_get_queue(bdev)); 790c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 791c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 792c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_finished_io(nsects) do { } while (0) 793c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define blk_started_io(nsects) do { } while (0) 794c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 795c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* assumes size > 256 */ 796c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline unsigned int blksize_bits(unsigned int size) 797c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 798c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned int bits = 8; 799c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru do { 800c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru bits++; 801c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru size >>= 1; 802c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } while (size > 256); 803c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return bits; 804c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 805c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 806c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline unsigned int block_size(struct block_device *bdev) 807c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 808c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return bdev->bd_block_size; 809c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 810c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 811c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct {struct page *v;} Sector; 812c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 813c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruunsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); 814c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 815c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void put_dev_sector(Sector p) 816c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 817c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru page_cache_release(p.v); 818c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 819c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 820c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct work_struct; 821c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint kblockd_schedule_work(struct work_struct *work); 822c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid kblockd_flush(void); 823c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 824c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_LBD 825c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru# include <asm/div64.h> 826c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru# define sector_div(a, b) do_div(a, b) 827c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 828c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru# define sector_div(n, b)( \ 829c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ \ 830c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int _res; \ 831c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru _res = (n) % (b); \ 832c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru (n) /= (b); \ 833c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru _res; \ 834c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} \ 835c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru) 836c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 837c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 838c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MODULE_ALIAS_BLOCKDEV(major,minor) \ 839c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 840c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 841c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru MODULE_ALIAS("block-major-" __stringify(major) "-*") 842c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 843c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 844c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 845