1089 строки
33 KiB
C
1089 строки
33 KiB
C
#ifndef _LINUX_BLKDEV_H
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#define _LINUX_BLKDEV_H
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#ifdef CONFIG_BLOCK
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#include <linux/sched.h>
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#include <linux/major.h>
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#include <linux/genhd.h>
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <linux/pagemap.h>
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#include <linux/backing-dev.h>
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#include <linux/wait.h>
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#include <linux/mempool.h>
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#include <linux/bio.h>
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#include <linux/module.h>
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#include <linux/stringify.h>
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#include <linux/gfp.h>
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#include <linux/bsg.h>
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#include <linux/smp.h>
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#include <asm/scatterlist.h>
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struct scsi_ioctl_command;
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struct request_queue;
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struct elevator_queue;
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typedef struct elevator_queue elevator_t;
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struct request_pm_state;
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struct blk_trace;
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struct request;
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struct sg_io_hdr;
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#define BLKDEV_MIN_RQ 4
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#define BLKDEV_MAX_RQ 128 /* Default maximum */
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struct request;
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typedef void (rq_end_io_fn)(struct request *, int);
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struct request_list {
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int count[2];
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int starved[2];
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int elvpriv;
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mempool_t *rq_pool;
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wait_queue_head_t wait[2];
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};
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/*
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* request command types
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*/
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enum rq_cmd_type_bits {
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REQ_TYPE_FS = 1, /* fs request */
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REQ_TYPE_BLOCK_PC, /* scsi command */
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REQ_TYPE_SENSE, /* sense request */
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REQ_TYPE_PM_SUSPEND, /* suspend request */
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REQ_TYPE_PM_RESUME, /* resume request */
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REQ_TYPE_PM_SHUTDOWN, /* shutdown request */
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REQ_TYPE_SPECIAL, /* driver defined type */
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REQ_TYPE_LINUX_BLOCK, /* generic block layer message */
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/*
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* for ATA/ATAPI devices. this really doesn't belong here, ide should
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* use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
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* private REQ_LB opcodes to differentiate what type of request this is
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*/
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REQ_TYPE_ATA_TASKFILE,
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REQ_TYPE_ATA_PC,
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};
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/*
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* For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being
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* sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a
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* SCSI cdb.
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*
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* 0x00 -> 0x3f are driver private, to be used for whatever purpose they need,
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* typically to differentiate REQ_TYPE_SPECIAL requests.
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*
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*/
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enum {
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REQ_LB_OP_EJECT = 0x40, /* eject request */
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REQ_LB_OP_FLUSH = 0x41, /* flush request */
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REQ_LB_OP_DISCARD = 0x42, /* discard sectors */
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};
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/*
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* request type modified bits. first two bits match BIO_RW* bits, important
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*/
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enum rq_flag_bits {
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__REQ_RW, /* not set, read. set, write */
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__REQ_FAILFAST_DEV, /* no driver retries of device errors */
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__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
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__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
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__REQ_DISCARD, /* request to discard sectors */
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__REQ_SORTED, /* elevator knows about this request */
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__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
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__REQ_HARDBARRIER, /* may not be passed by drive either */
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__REQ_FUA, /* forced unit access */
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__REQ_NOMERGE, /* don't touch this for merging */
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__REQ_STARTED, /* drive already may have started this one */
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__REQ_DONTPREP, /* don't call prep for this one */
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__REQ_QUEUED, /* uses queueing */
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__REQ_ELVPRIV, /* elevator private data attached */
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__REQ_FAILED, /* set if the request failed */
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__REQ_QUIET, /* don't worry about errors */
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__REQ_PREEMPT, /* set for "ide_preempt" requests */
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__REQ_ORDERED_COLOR, /* is before or after barrier */
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__REQ_RW_SYNC, /* request is sync (O_DIRECT) */
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__REQ_ALLOCED, /* request came from our alloc pool */
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__REQ_RW_META, /* metadata io request */
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__REQ_COPY_USER, /* contains copies of user pages */
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__REQ_INTEGRITY, /* integrity metadata has been remapped */
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__REQ_NR_BITS, /* stops here */
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};
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#define REQ_RW (1 << __REQ_RW)
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#define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV)
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#define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT)
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#define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER)
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#define REQ_DISCARD (1 << __REQ_DISCARD)
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#define REQ_SORTED (1 << __REQ_SORTED)
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#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
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#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
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#define REQ_FUA (1 << __REQ_FUA)
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#define REQ_NOMERGE (1 << __REQ_NOMERGE)
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#define REQ_STARTED (1 << __REQ_STARTED)
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#define REQ_DONTPREP (1 << __REQ_DONTPREP)
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#define REQ_QUEUED (1 << __REQ_QUEUED)
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#define REQ_ELVPRIV (1 << __REQ_ELVPRIV)
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#define REQ_FAILED (1 << __REQ_FAILED)
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#define REQ_QUIET (1 << __REQ_QUIET)
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#define REQ_PREEMPT (1 << __REQ_PREEMPT)
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#define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR)
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#define REQ_RW_SYNC (1 << __REQ_RW_SYNC)
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#define REQ_ALLOCED (1 << __REQ_ALLOCED)
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#define REQ_RW_META (1 << __REQ_RW_META)
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#define REQ_COPY_USER (1 << __REQ_COPY_USER)
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#define REQ_INTEGRITY (1 << __REQ_INTEGRITY)
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#define BLK_MAX_CDB 16
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/*
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* try to put the fields that are referenced together in the same cacheline.
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* if you modify this structure, be sure to check block/blk-core.c:rq_init()
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* as well!
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*/
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struct request {
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struct list_head queuelist;
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struct call_single_data csd;
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int cpu;
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struct request_queue *q;
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unsigned int cmd_flags;
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enum rq_cmd_type_bits cmd_type;
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unsigned long atomic_flags;
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/* Maintain bio traversal state for part by part I/O submission.
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* hard_* are block layer internals, no driver should touch them!
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*/
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sector_t sector; /* next sector to submit */
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sector_t hard_sector; /* next sector to complete */
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unsigned long nr_sectors; /* no. of sectors left to submit */
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unsigned long hard_nr_sectors; /* no. of sectors left to complete */
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/* no. of sectors left to submit in the current segment */
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unsigned int current_nr_sectors;
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/* no. of sectors left to complete in the current segment */
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unsigned int hard_cur_sectors;
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struct bio *bio;
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struct bio *biotail;
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struct hlist_node hash; /* merge hash */
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/*
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* The rb_node is only used inside the io scheduler, requests
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* are pruned when moved to the dispatch queue. So let the
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* completion_data share space with the rb_node.
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*/
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union {
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struct rb_node rb_node; /* sort/lookup */
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void *completion_data;
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};
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/*
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* two pointers are available for the IO schedulers, if they need
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* more they have to dynamically allocate it.
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*/
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void *elevator_private;
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void *elevator_private2;
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struct gendisk *rq_disk;
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unsigned long start_time;
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/* Number of scatter-gather DMA addr+len pairs after
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* physical address coalescing is performed.
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*/
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unsigned short nr_phys_segments;
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unsigned short ioprio;
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void *special;
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char *buffer;
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int tag;
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int errors;
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int ref_count;
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/*
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* when request is used as a packet command carrier
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*/
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unsigned short cmd_len;
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unsigned char __cmd[BLK_MAX_CDB];
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unsigned char *cmd;
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unsigned int data_len;
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unsigned int extra_len; /* length of alignment and padding */
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unsigned int sense_len;
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void *data;
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void *sense;
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unsigned long deadline;
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struct list_head timeout_list;
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unsigned int timeout;
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int retries;
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/*
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* completion callback.
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*/
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rq_end_io_fn *end_io;
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void *end_io_data;
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/* for bidi */
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struct request *next_rq;
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};
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static inline unsigned short req_get_ioprio(struct request *req)
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{
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return req->ioprio;
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}
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/*
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* State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
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* requests. Some step values could eventually be made generic.
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*/
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struct request_pm_state
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{
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/* PM state machine step value, currently driver specific */
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int pm_step;
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/* requested PM state value (S1, S2, S3, S4, ...) */
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u32 pm_state;
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void* data; /* for driver use */
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};
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#include <linux/elevator.h>
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typedef void (request_fn_proc) (struct request_queue *q);
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typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
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typedef int (prep_rq_fn) (struct request_queue *, struct request *);
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typedef void (unplug_fn) (struct request_queue *);
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typedef int (prepare_discard_fn) (struct request_queue *, struct request *);
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struct bio_vec;
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struct bvec_merge_data {
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struct block_device *bi_bdev;
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sector_t bi_sector;
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unsigned bi_size;
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unsigned long bi_rw;
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};
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typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
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struct bio_vec *);
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typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
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typedef void (softirq_done_fn)(struct request *);
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typedef int (dma_drain_needed_fn)(struct request *);
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typedef int (lld_busy_fn) (struct request_queue *q);
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enum blk_eh_timer_return {
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BLK_EH_NOT_HANDLED,
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BLK_EH_HANDLED,
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BLK_EH_RESET_TIMER,
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};
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typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
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enum blk_queue_state {
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Queue_down,
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Queue_up,
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};
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struct blk_queue_tag {
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struct request **tag_index; /* map of busy tags */
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unsigned long *tag_map; /* bit map of free/busy tags */
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int busy; /* current depth */
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int max_depth; /* what we will send to device */
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int real_max_depth; /* what the array can hold */
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atomic_t refcnt; /* map can be shared */
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};
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#define BLK_SCSI_MAX_CMDS (256)
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#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
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struct blk_cmd_filter {
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unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
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unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
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struct kobject kobj;
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};
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struct request_queue
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{
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/*
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* Together with queue_head for cacheline sharing
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*/
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struct list_head queue_head;
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struct request *last_merge;
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elevator_t *elevator;
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/*
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* the queue request freelist, one for reads and one for writes
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*/
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struct request_list rq;
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request_fn_proc *request_fn;
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make_request_fn *make_request_fn;
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prep_rq_fn *prep_rq_fn;
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unplug_fn *unplug_fn;
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prepare_discard_fn *prepare_discard_fn;
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merge_bvec_fn *merge_bvec_fn;
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prepare_flush_fn *prepare_flush_fn;
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softirq_done_fn *softirq_done_fn;
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rq_timed_out_fn *rq_timed_out_fn;
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dma_drain_needed_fn *dma_drain_needed;
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lld_busy_fn *lld_busy_fn;
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/*
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* Dispatch queue sorting
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*/
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sector_t end_sector;
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struct request *boundary_rq;
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/*
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* Auto-unplugging state
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*/
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struct timer_list unplug_timer;
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int unplug_thresh; /* After this many requests */
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unsigned long unplug_delay; /* After this many jiffies */
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struct work_struct unplug_work;
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struct backing_dev_info backing_dev_info;
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/*
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* The queue owner gets to use this for whatever they like.
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* ll_rw_blk doesn't touch it.
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*/
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void *queuedata;
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/*
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* queue needs bounce pages for pages above this limit
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*/
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unsigned long bounce_pfn;
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gfp_t bounce_gfp;
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/*
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* various queue flags, see QUEUE_* below
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*/
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unsigned long queue_flags;
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/*
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* protects queue structures from reentrancy. ->__queue_lock should
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* _never_ be used directly, it is queue private. always use
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* ->queue_lock.
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*/
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spinlock_t __queue_lock;
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spinlock_t *queue_lock;
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/*
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* queue kobject
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*/
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struct kobject kobj;
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/*
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* queue settings
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*/
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unsigned long nr_requests; /* Max # of requests */
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unsigned int nr_congestion_on;
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unsigned int nr_congestion_off;
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unsigned int nr_batching;
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unsigned int max_sectors;
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unsigned int max_hw_sectors;
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unsigned short max_phys_segments;
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unsigned short max_hw_segments;
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unsigned short hardsect_size;
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unsigned int max_segment_size;
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unsigned long seg_boundary_mask;
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void *dma_drain_buffer;
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unsigned int dma_drain_size;
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unsigned int dma_pad_mask;
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unsigned int dma_alignment;
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struct blk_queue_tag *queue_tags;
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struct list_head tag_busy_list;
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unsigned int nr_sorted;
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unsigned int in_flight;
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unsigned int rq_timeout;
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struct timer_list timeout;
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struct list_head timeout_list;
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/*
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* sg stuff
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*/
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unsigned int sg_timeout;
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unsigned int sg_reserved_size;
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int node;
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#ifdef CONFIG_BLK_DEV_IO_TRACE
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struct blk_trace *blk_trace;
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#endif
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/*
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* reserved for flush operations
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*/
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unsigned int ordered, next_ordered, ordseq;
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int orderr, ordcolor;
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struct request pre_flush_rq, bar_rq, post_flush_rq;
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struct request *orig_bar_rq;
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struct mutex sysfs_lock;
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#if defined(CONFIG_BLK_DEV_BSG)
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struct bsg_class_device bsg_dev;
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#endif
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struct blk_cmd_filter cmd_filter;
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};
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#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */
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#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
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#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
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#define QUEUE_FLAG_READFULL 3 /* read queue has been filled */
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#define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */
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#define QUEUE_FLAG_DEAD 5 /* queue being torn down */
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#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */
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#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */
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#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */
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#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
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#define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */
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#define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */
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#define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */
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#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
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#define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */
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static inline int queue_is_locked(struct request_queue *q)
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{
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#ifdef CONFIG_SMP
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spinlock_t *lock = q->queue_lock;
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return lock && spin_is_locked(lock);
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#else
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return 1;
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#endif
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}
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static inline void queue_flag_set_unlocked(unsigned int flag,
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struct request_queue *q)
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{
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__set_bit(flag, &q->queue_flags);
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}
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static inline int queue_flag_test_and_clear(unsigned int flag,
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struct request_queue *q)
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{
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WARN_ON_ONCE(!queue_is_locked(q));
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if (test_bit(flag, &q->queue_flags)) {
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__clear_bit(flag, &q->queue_flags);
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return 1;
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}
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return 0;
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}
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static inline int queue_flag_test_and_set(unsigned int flag,
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struct request_queue *q)
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{
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WARN_ON_ONCE(!queue_is_locked(q));
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if (!test_bit(flag, &q->queue_flags)) {
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__set_bit(flag, &q->queue_flags);
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return 0;
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}
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return 1;
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}
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static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
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{
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WARN_ON_ONCE(!queue_is_locked(q));
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__set_bit(flag, &q->queue_flags);
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}
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static inline void queue_flag_clear_unlocked(unsigned int flag,
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struct request_queue *q)
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{
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__clear_bit(flag, &q->queue_flags);
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}
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static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
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{
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WARN_ON_ONCE(!queue_is_locked(q));
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__clear_bit(flag, &q->queue_flags);
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}
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enum {
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/*
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* Hardbarrier is supported with one of the following methods.
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*
|
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* NONE : hardbarrier unsupported
|
|
* DRAIN : ordering by draining is enough
|
|
* DRAIN_FLUSH : ordering by draining w/ pre and post flushes
|
|
* DRAIN_FUA : ordering by draining w/ pre flush and FUA write
|
|
* TAG : ordering by tag is enough
|
|
* TAG_FLUSH : ordering by tag w/ pre and post flushes
|
|
* TAG_FUA : ordering by tag w/ pre flush and FUA write
|
|
*/
|
|
QUEUE_ORDERED_NONE = 0x00,
|
|
QUEUE_ORDERED_DRAIN = 0x01,
|
|
QUEUE_ORDERED_TAG = 0x02,
|
|
|
|
QUEUE_ORDERED_PREFLUSH = 0x10,
|
|
QUEUE_ORDERED_POSTFLUSH = 0x20,
|
|
QUEUE_ORDERED_FUA = 0x40,
|
|
|
|
QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN |
|
|
QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
|
|
QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN |
|
|
QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
|
|
QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG |
|
|
QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
|
|
QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG |
|
|
QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
|
|
|
|
/*
|
|
* Ordered operation sequence
|
|
*/
|
|
QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */
|
|
QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */
|
|
QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */
|
|
QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */
|
|
QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */
|
|
QUEUE_ORDSEQ_DONE = 0x20,
|
|
};
|
|
|
|
#define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
|
|
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
|
|
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
|
|
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
|
|
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
|
|
#define blk_queue_flushing(q) ((q)->ordseq)
|
|
#define blk_queue_stackable(q) \
|
|
test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
|
|
|
|
#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
|
|
#define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
|
|
#define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL)
|
|
#define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE)
|
|
|
|
#define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV)
|
|
#define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT)
|
|
#define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER)
|
|
#define blk_noretry_request(rq) (blk_failfast_dev(rq) || \
|
|
blk_failfast_transport(rq) || \
|
|
blk_failfast_driver(rq))
|
|
#define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED)
|
|
|
|
#define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq)))
|
|
|
|
#define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND)
|
|
#define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME)
|
|
#define blk_pm_request(rq) \
|
|
(blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
|
|
|
|
#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
|
|
#define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED)
|
|
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
|
|
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
|
|
#define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD)
|
|
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
|
|
#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
|
|
/* rq->queuelist of dequeued request must be list_empty() */
|
|
#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
|
|
|
|
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
|
|
|
|
#define rq_data_dir(rq) ((rq)->cmd_flags & 1)
|
|
|
|
/*
|
|
* We regard a request as sync, if it's a READ or a SYNC write.
|
|
*/
|
|
#define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC)
|
|
#define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META)
|
|
|
|
static inline int blk_queue_full(struct request_queue *q, int rw)
|
|
{
|
|
if (rw == READ)
|
|
return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags);
|
|
return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags);
|
|
}
|
|
|
|
static inline void blk_set_queue_full(struct request_queue *q, int rw)
|
|
{
|
|
if (rw == READ)
|
|
queue_flag_set(QUEUE_FLAG_READFULL, q);
|
|
else
|
|
queue_flag_set(QUEUE_FLAG_WRITEFULL, q);
|
|
}
|
|
|
|
static inline void blk_clear_queue_full(struct request_queue *q, int rw)
|
|
{
|
|
if (rw == READ)
|
|
queue_flag_clear(QUEUE_FLAG_READFULL, q);
|
|
else
|
|
queue_flag_clear(QUEUE_FLAG_WRITEFULL, q);
|
|
}
|
|
|
|
|
|
/*
|
|
* mergeable request must not have _NOMERGE or _BARRIER bit set, nor may
|
|
* it already be started by driver.
|
|
*/
|
|
#define RQ_NOMERGE_FLAGS \
|
|
(REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER)
|
|
#define rq_mergeable(rq) \
|
|
(!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
|
|
(blk_discard_rq(rq) || blk_fs_request((rq))))
|
|
|
|
/*
|
|
* q->prep_rq_fn return values
|
|
*/
|
|
#define BLKPREP_OK 0 /* serve it */
|
|
#define BLKPREP_KILL 1 /* fatal error, kill */
|
|
#define BLKPREP_DEFER 2 /* leave on queue */
|
|
|
|
extern unsigned long blk_max_low_pfn, blk_max_pfn;
|
|
|
|
/*
|
|
* standard bounce addresses:
|
|
*
|
|
* BLK_BOUNCE_HIGH : bounce all highmem pages
|
|
* BLK_BOUNCE_ANY : don't bounce anything
|
|
* BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
|
|
*/
|
|
|
|
#if BITS_PER_LONG == 32
|
|
#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
|
|
#else
|
|
#define BLK_BOUNCE_HIGH -1ULL
|
|
#endif
|
|
#define BLK_BOUNCE_ANY (-1ULL)
|
|
#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
|
|
|
|
/*
|
|
* default timeout for SG_IO if none specified
|
|
*/
|
|
#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
|
|
|
|
#ifdef CONFIG_BOUNCE
|
|
extern int init_emergency_isa_pool(void);
|
|
extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
|
|
#else
|
|
static inline int init_emergency_isa_pool(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
struct rq_map_data {
|
|
struct page **pages;
|
|
int page_order;
|
|
int nr_entries;
|
|
};
|
|
|
|
struct req_iterator {
|
|
int i;
|
|
struct bio *bio;
|
|
};
|
|
|
|
/* This should not be used directly - use rq_for_each_segment */
|
|
#define __rq_for_each_bio(_bio, rq) \
|
|
if ((rq->bio)) \
|
|
for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
|
|
|
|
#define rq_for_each_segment(bvl, _rq, _iter) \
|
|
__rq_for_each_bio(_iter.bio, _rq) \
|
|
bio_for_each_segment(bvl, _iter.bio, _iter.i)
|
|
|
|
#define rq_iter_last(rq, _iter) \
|
|
(_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1)
|
|
|
|
extern int blk_register_queue(struct gendisk *disk);
|
|
extern void blk_unregister_queue(struct gendisk *disk);
|
|
extern void register_disk(struct gendisk *dev);
|
|
extern void generic_make_request(struct bio *bio);
|
|
extern void blk_rq_init(struct request_queue *q, struct request *rq);
|
|
extern void blk_put_request(struct request *);
|
|
extern void __blk_put_request(struct request_queue *, struct request *);
|
|
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
|
|
extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
|
|
extern void blk_requeue_request(struct request_queue *, struct request *);
|
|
extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
|
|
extern int blk_lld_busy(struct request_queue *q);
|
|
extern int blk_insert_cloned_request(struct request_queue *q,
|
|
struct request *rq);
|
|
extern void blk_plug_device(struct request_queue *);
|
|
extern void blk_plug_device_unlocked(struct request_queue *);
|
|
extern int blk_remove_plug(struct request_queue *);
|
|
extern void blk_recount_segments(struct request_queue *, struct bio *);
|
|
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
|
|
unsigned int, void __user *);
|
|
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
|
|
struct scsi_ioctl_command __user *);
|
|
|
|
/*
|
|
* Temporary export, until SCSI gets fixed up.
|
|
*/
|
|
extern int blk_rq_append_bio(struct request_queue *q, struct request *rq,
|
|
struct bio *bio);
|
|
|
|
/*
|
|
* A queue has just exitted congestion. Note this in the global counter of
|
|
* congested queues, and wake up anyone who was waiting for requests to be
|
|
* put back.
|
|
*/
|
|
static inline void blk_clear_queue_congested(struct request_queue *q, int rw)
|
|
{
|
|
clear_bdi_congested(&q->backing_dev_info, rw);
|
|
}
|
|
|
|
/*
|
|
* A queue has just entered congestion. Flag that in the queue's VM-visible
|
|
* state flags and increment the global gounter of congested queues.
|
|
*/
|
|
static inline void blk_set_queue_congested(struct request_queue *q, int rw)
|
|
{
|
|
set_bdi_congested(&q->backing_dev_info, rw);
|
|
}
|
|
|
|
extern void blk_start_queue(struct request_queue *q);
|
|
extern void blk_stop_queue(struct request_queue *q);
|
|
extern void blk_sync_queue(struct request_queue *q);
|
|
extern void __blk_stop_queue(struct request_queue *q);
|
|
extern void __blk_run_queue(struct request_queue *);
|
|
extern void blk_run_queue(struct request_queue *);
|
|
extern void blk_start_queueing(struct request_queue *);
|
|
extern int blk_rq_map_user(struct request_queue *, struct request *,
|
|
struct rq_map_data *, void __user *, unsigned long,
|
|
gfp_t);
|
|
extern int blk_rq_unmap_user(struct bio *);
|
|
extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
|
|
extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
|
|
struct rq_map_data *, struct sg_iovec *, int,
|
|
unsigned int, gfp_t);
|
|
extern int blk_execute_rq(struct request_queue *, struct gendisk *,
|
|
struct request *, int);
|
|
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
|
|
struct request *, int, rq_end_io_fn *);
|
|
extern void blk_unplug(struct request_queue *q);
|
|
|
|
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_disk->queue;
|
|
}
|
|
|
|
static inline void blk_run_backing_dev(struct backing_dev_info *bdi,
|
|
struct page *page)
|
|
{
|
|
if (bdi && bdi->unplug_io_fn)
|
|
bdi->unplug_io_fn(bdi, page);
|
|
}
|
|
|
|
static inline void blk_run_address_space(struct address_space *mapping)
|
|
{
|
|
if (mapping)
|
|
blk_run_backing_dev(mapping->backing_dev_info, NULL);
|
|
}
|
|
|
|
extern void blkdev_dequeue_request(struct request *req);
|
|
|
|
/*
|
|
* blk_end_request() and friends.
|
|
* __blk_end_request() and end_request() must be called with
|
|
* the request queue spinlock acquired.
|
|
*
|
|
* Several drivers define their own end_request and call
|
|
* blk_end_request() for parts of the original function.
|
|
* This prevents code duplication in drivers.
|
|
*/
|
|
extern int blk_end_request(struct request *rq, int error,
|
|
unsigned int nr_bytes);
|
|
extern int __blk_end_request(struct request *rq, int error,
|
|
unsigned int nr_bytes);
|
|
extern int blk_end_bidi_request(struct request *rq, int error,
|
|
unsigned int nr_bytes, unsigned int bidi_bytes);
|
|
extern void end_request(struct request *, int);
|
|
extern int blk_end_request_callback(struct request *rq, int error,
|
|
unsigned int nr_bytes,
|
|
int (drv_callback)(struct request *));
|
|
extern void blk_complete_request(struct request *);
|
|
extern void __blk_complete_request(struct request *);
|
|
extern void blk_abort_request(struct request *);
|
|
extern void blk_abort_queue(struct request_queue *);
|
|
extern void blk_update_request(struct request *rq, int error,
|
|
unsigned int nr_bytes);
|
|
|
|
/*
|
|
* blk_end_request() takes bytes instead of sectors as a complete size.
|
|
* blk_rq_bytes() returns bytes left to complete in the entire request.
|
|
* blk_rq_cur_bytes() returns bytes left to complete in the current segment.
|
|
*/
|
|
extern unsigned int blk_rq_bytes(struct request *rq);
|
|
extern unsigned int blk_rq_cur_bytes(struct request *rq);
|
|
|
|
/*
|
|
* Access functions for manipulating queue properties
|
|
*/
|
|
extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
|
|
spinlock_t *lock, int node_id);
|
|
extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
|
|
extern void blk_cleanup_queue(struct request_queue *);
|
|
extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
|
|
extern void blk_queue_bounce_limit(struct request_queue *, u64);
|
|
extern void blk_queue_max_sectors(struct request_queue *, unsigned int);
|
|
extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short);
|
|
extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
|
|
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
|
|
extern void blk_queue_hardsect_size(struct request_queue *, unsigned short);
|
|
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
|
|
extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
|
|
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
|
|
extern int blk_queue_dma_drain(struct request_queue *q,
|
|
dma_drain_needed_fn *dma_drain_needed,
|
|
void *buf, unsigned int size);
|
|
extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
|
|
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
|
|
extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
|
|
extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
|
|
extern void blk_queue_dma_alignment(struct request_queue *, int);
|
|
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
|
|
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
|
|
extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *);
|
|
extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
|
|
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
|
|
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
|
|
extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
|
|
extern int blk_do_ordered(struct request_queue *, struct request **);
|
|
extern unsigned blk_ordered_cur_seq(struct request_queue *);
|
|
extern unsigned blk_ordered_req_seq(struct request *);
|
|
extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int);
|
|
|
|
extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
|
|
extern void blk_dump_rq_flags(struct request *, char *);
|
|
extern void generic_unplug_device(struct request_queue *);
|
|
extern long nr_blockdev_pages(void);
|
|
|
|
int blk_get_queue(struct request_queue *);
|
|
struct request_queue *blk_alloc_queue(gfp_t);
|
|
struct request_queue *blk_alloc_queue_node(gfp_t, int);
|
|
extern void blk_put_queue(struct request_queue *);
|
|
|
|
/*
|
|
* tag stuff
|
|
*/
|
|
#define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
|
|
extern int blk_queue_start_tag(struct request_queue *, struct request *);
|
|
extern struct request *blk_queue_find_tag(struct request_queue *, int);
|
|
extern void blk_queue_end_tag(struct request_queue *, struct request *);
|
|
extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *);
|
|
extern void blk_queue_free_tags(struct request_queue *);
|
|
extern int blk_queue_resize_tags(struct request_queue *, int);
|
|
extern void blk_queue_invalidate_tags(struct request_queue *);
|
|
extern struct blk_queue_tag *blk_init_tags(int);
|
|
extern void blk_free_tags(struct blk_queue_tag *);
|
|
|
|
static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
|
|
int tag)
|
|
{
|
|
if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
|
|
return NULL;
|
|
return bqt->tag_index[tag];
|
|
}
|
|
|
|
extern int blkdev_issue_flush(struct block_device *, sector_t *);
|
|
extern int blkdev_issue_discard(struct block_device *,
|
|
sector_t sector, sector_t nr_sects, gfp_t);
|
|
|
|
static inline int sb_issue_discard(struct super_block *sb,
|
|
sector_t block, sector_t nr_blocks)
|
|
{
|
|
block <<= (sb->s_blocksize_bits - 9);
|
|
nr_blocks <<= (sb->s_blocksize_bits - 9);
|
|
return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL);
|
|
}
|
|
|
|
/*
|
|
* command filter functions
|
|
*/
|
|
extern int blk_verify_command(struct blk_cmd_filter *filter,
|
|
unsigned char *cmd, fmode_t has_write_perm);
|
|
extern void blk_unregister_filter(struct gendisk *disk);
|
|
extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter);
|
|
|
|
#define MAX_PHYS_SEGMENTS 128
|
|
#define MAX_HW_SEGMENTS 128
|
|
#define SAFE_MAX_SECTORS 255
|
|
#define BLK_DEF_MAX_SECTORS 1024
|
|
|
|
#define MAX_SEGMENT_SIZE 65536
|
|
|
|
#define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL
|
|
|
|
#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
|
|
|
|
static inline int queue_hardsect_size(struct request_queue *q)
|
|
{
|
|
int retval = 512;
|
|
|
|
if (q && q->hardsect_size)
|
|
retval = q->hardsect_size;
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline int bdev_hardsect_size(struct block_device *bdev)
|
|
{
|
|
return queue_hardsect_size(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline int queue_dma_alignment(struct request_queue *q)
|
|
{
|
|
return q ? q->dma_alignment : 511;
|
|
}
|
|
|
|
static inline int blk_rq_aligned(struct request_queue *q, void *addr,
|
|
unsigned int len)
|
|
{
|
|
unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
|
|
return !((unsigned long)addr & alignment) && !(len & alignment);
|
|
}
|
|
|
|
/* assumes size > 256 */
|
|
static inline unsigned int blksize_bits(unsigned int size)
|
|
{
|
|
unsigned int bits = 8;
|
|
do {
|
|
bits++;
|
|
size >>= 1;
|
|
} while (size > 256);
|
|
return bits;
|
|
}
|
|
|
|
static inline unsigned int block_size(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_block_size;
|
|
}
|
|
|
|
typedef struct {struct page *v;} Sector;
|
|
|
|
unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
|
|
|
|
static inline void put_dev_sector(Sector p)
|
|
{
|
|
page_cache_release(p.v);
|
|
}
|
|
|
|
struct work_struct;
|
|
int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
|
|
void kblockd_flush_work(struct work_struct *work);
|
|
|
|
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
|
|
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
|
|
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
|
|
MODULE_ALIAS("block-major-" __stringify(major) "-*")
|
|
|
|
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
|
|
|
#define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
|
|
#define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
|
|
|
|
struct blk_integrity_exchg {
|
|
void *prot_buf;
|
|
void *data_buf;
|
|
sector_t sector;
|
|
unsigned int data_size;
|
|
unsigned short sector_size;
|
|
const char *disk_name;
|
|
};
|
|
|
|
typedef void (integrity_gen_fn) (struct blk_integrity_exchg *);
|
|
typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *);
|
|
typedef void (integrity_set_tag_fn) (void *, void *, unsigned int);
|
|
typedef void (integrity_get_tag_fn) (void *, void *, unsigned int);
|
|
|
|
struct blk_integrity {
|
|
integrity_gen_fn *generate_fn;
|
|
integrity_vrfy_fn *verify_fn;
|
|
integrity_set_tag_fn *set_tag_fn;
|
|
integrity_get_tag_fn *get_tag_fn;
|
|
|
|
unsigned short flags;
|
|
unsigned short tuple_size;
|
|
unsigned short sector_size;
|
|
unsigned short tag_size;
|
|
|
|
const char *name;
|
|
|
|
struct kobject kobj;
|
|
};
|
|
|
|
extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
|
|
extern void blk_integrity_unregister(struct gendisk *);
|
|
extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
|
|
extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
|
|
extern int blk_rq_count_integrity_sg(struct request *);
|
|
|
|
static inline
|
|
struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_disk->integrity;
|
|
}
|
|
|
|
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
|
|
{
|
|
return disk->integrity;
|
|
}
|
|
|
|
static inline int blk_integrity_rq(struct request *rq)
|
|
{
|
|
if (rq->bio == NULL)
|
|
return 0;
|
|
|
|
return bio_integrity(rq->bio);
|
|
}
|
|
|
|
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
#define blk_integrity_rq(rq) (0)
|
|
#define blk_rq_count_integrity_sg(a) (0)
|
|
#define blk_rq_map_integrity_sg(a, b) (0)
|
|
#define bdev_get_integrity(a) (0)
|
|
#define blk_get_integrity(a) (0)
|
|
#define blk_integrity_compare(a, b) (0)
|
|
#define blk_integrity_register(a, b) (0)
|
|
#define blk_integrity_unregister(a) do { } while (0);
|
|
|
|
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
struct block_device_operations {
|
|
int (*open) (struct block_device *, fmode_t);
|
|
int (*release) (struct gendisk *, fmode_t);
|
|
int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
int (*direct_access) (struct block_device *, sector_t,
|
|
void **, unsigned long *);
|
|
int (*media_changed) (struct gendisk *);
|
|
int (*revalidate_disk) (struct gendisk *);
|
|
int (*getgeo)(struct block_device *, struct hd_geometry *);
|
|
struct module *owner;
|
|
};
|
|
|
|
extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
|
|
unsigned long);
|
|
#else /* CONFIG_BLOCK */
|
|
/*
|
|
* stubs for when the block layer is configured out
|
|
*/
|
|
#define buffer_heads_over_limit 0
|
|
|
|
static inline long nr_blockdev_pages(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_BLOCK */
|
|
|
|
#endif
|