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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [block/] [ll_rw_blk.c] - Blame information for rev 1782

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/*
 *  linux/drivers/block/ll_rw_blk.c
 *
 * Copyright (C) 1991, 1992 Linus Torvalds
 * Copyright (C) 1994,      Karl Keyte: Added support for disk statistics
 */
 
/*
 * This handles all read/write requests to block devices
 */
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/config.h>
#include <linux/locks.h>
#include <linux/mm.h>
 
#include <asm/system.h>
#include <asm/io.h>
#include <linux/blk.h>
 
/*
 * The request-struct contains all necessary data
 * to load a nr of sectors into memory
 */
static struct request all_requests[NR_REQUEST];
 
/*
 * The "disk" task queue is used to start the actual requests
 * after a plug
 */
DECLARE_TASK_QUEUE(tq_disk);
 
/*
 * used to wait on when there are no free requests
 */
struct wait_queue * wait_for_request = NULL;
 
/* This specifies how many sectors to read ahead on the disk.  */
 
int read_ahead[MAX_BLKDEV] = {0, };
 
/* blk_dev_struct is:
 *      *request_fn
 *      *current_request
 */
struct blk_dev_struct blk_dev[MAX_BLKDEV]; /* initialized by blk_dev_init() */
 
/*
 * blk_size contains the size of all block-devices in units of 1024 byte
 * sectors:
 *
 * blk_size[MAJOR][MINOR]
 *
 * if (!blk_size[MAJOR]) then no minor size checking is done.
 */
int * blk_size[MAX_BLKDEV] = { NULL, NULL, };
 
/*
 * blksize_size contains the size of all block-devices:
 *
 * blksize_size[MAJOR][MINOR]
 *
 * if (!blksize_size[MAJOR]) then 1024 bytes is assumed.
 */
int * blksize_size[MAX_BLKDEV] = { NULL, NULL, };
 
/*
 * hardsect_size contains the size of the hardware sector of a device.
 *
 * hardsect_size[MAJOR][MINOR]
 *
 * if (!hardsect_size[MAJOR])
 *              then 512 bytes is assumed.
 * else
 *              sector_size is hardsect_size[MAJOR][MINOR]
 * This is currently set by some scsi device and read by the msdos fs driver
 * This might be a some uses later.
 */
int * hardsect_size[MAX_BLKDEV] = { NULL, NULL, };
 
/*
 * Max number of sectors per request
 */
int * max_sectors[MAX_BLKDEV] = { NULL, NULL, };
 
/*
 * Max number of segments per request
 */
int * max_segments[MAX_BLKDEV] = { NULL, NULL, };
 
static inline int get_max_sectors(kdev_t dev)
{
        if (!max_sectors[MAJOR(dev)])
                return MAX_SECTORS;
        return max_sectors[MAJOR(dev)][MINOR(dev)];
}
 
static inline int get_max_segments(kdev_t dev)
{
        if (!max_segments[MAJOR(dev)])
                return MAX_SEGMENTS;
        return max_segments[MAJOR(dev)][MINOR(dev)];
}
 
/*
 * remove the plug and let it rip..
 */
void unplug_device(void * data)
{
        struct blk_dev_struct * dev = (struct blk_dev_struct *) data;
        unsigned long flags;
 
        save_flags(flags);
        cli();
        if (dev->current_request == &dev->plug) {
                struct request * next = dev->plug.next;
                dev->current_request = next;
                if (next) {
                        dev->plug.next = NULL;
                        (dev->request_fn)();
                }
        }
        restore_flags(flags);
}
 
/*
 * "plug" the device if there are no outstanding requests: this will
 * force the transfer to start only after we have put all the requests
 * on the list.
 *
 * This is called with interrupts off and no requests on the queue.
 */
static inline void plug_device(struct blk_dev_struct * dev)
{
        dev->current_request = &dev->plug;
        queue_task_irq_off(&dev->plug_tq, &tq_disk);
}
 
/*
 * look for a free request in the first N entries.
 * NOTE: interrupts must be disabled on the way in, and will still
 *       be disabled on the way out.
 */
static inline struct request * get_request(int n, kdev_t dev)
{
        static struct request *prev_found = NULL, *prev_limit = NULL;
        register struct request *req, *limit;
 
        if (n <= 0)
                panic("get_request(%d): impossible!\n", n);
 
        limit = all_requests + n;
        if (limit != prev_limit) {
                prev_limit = limit;
                prev_found = all_requests;
        }
        req = prev_found;
        for (;;) {
                req = ((req > all_requests) ? req : limit) - 1;
                if (req->rq_status == RQ_INACTIVE)
                        break;
                if (req == prev_found)
                        return NULL;
        }
        prev_found = req;
        req->rq_status = RQ_ACTIVE;
        req->rq_dev = dev;
        return req;
}
 
/*
 * wait until a free request in the first N entries is available.
 */
static struct request * __get_request_wait(int n, kdev_t dev)
{
        register struct request *req;
        struct wait_queue wait = { current, NULL };
 
        add_wait_queue(&wait_for_request, &wait);
        for (;;) {
                current->state = TASK_UNINTERRUPTIBLE;
                cli();
                req = get_request(n, dev);
                sti();
                if (req)
                        break;
                run_task_queue(&tq_disk);
                schedule();
        }
        remove_wait_queue(&wait_for_request, &wait);
        current->state = TASK_RUNNING;
        return req;
}
 
static inline struct request * get_request_wait(int n, kdev_t dev)
{
        register struct request *req;
 
        cli();
        req = get_request(n, dev);
        sti();
        if (req)
                return req;
        return __get_request_wait(n, dev);
}
 
/* RO fail safe mechanism */
 
static long ro_bits[MAX_BLKDEV][8];
 
int is_read_only(kdev_t dev)
{
        int minor,major;
 
        major = MAJOR(dev);
        minor = MINOR(dev);
        if (major < 0 || major >= MAX_BLKDEV) return 0;
        return ro_bits[major][minor >> 5] & (1 << (minor & 31));
}
 
void set_device_ro(kdev_t dev,int flag)
{
        int minor,major;
 
        major = MAJOR(dev);
        minor = MINOR(dev);
        if (major < 0 || major >= MAX_BLKDEV) return;
        if (flag) ro_bits[major][minor >> 5] |= 1 << (minor & 31);
        else ro_bits[major][minor >> 5] &= ~(1 << (minor & 31));
}
 
static inline void drive_stat_acct(int cmd, unsigned long nr_sectors,
                                   short disk_index)
{
        kstat.dk_drive[disk_index]++;
        if (cmd == READ) {
                kstat.dk_drive_rio[disk_index]++;
                kstat.dk_drive_rblk[disk_index] += nr_sectors;
        } else if (cmd == WRITE) {
                kstat.dk_drive_wio[disk_index]++;
                kstat.dk_drive_wblk[disk_index] += nr_sectors;
        } else
                printk(KERN_ERR "drive_stat_acct: cmd not R/W?\n");
}
 
/*
 * add-request adds a request to the linked list.
 * It disables interrupts so that it can muck with the
 * request-lists in peace.
 *
 * By this point, req->cmd is always either READ/WRITE, never READA/WRITEA,
 * which is important for drive_stat_acct() above.
 */
 
void add_request(struct blk_dev_struct * dev, struct request * req)
{
        int major = MAJOR(req->rq_dev);
        int minor = MINOR(req->rq_dev);
        struct request * tmp;
        short            disk_index;
 
        switch (major) {
                case DAC960_MAJOR+0:
                        disk_index = (minor & 0x00f8) >> 3;
                        if (disk_index < 4)
                                drive_stat_acct(req->cmd, req->nr_sectors, disk_index);
                        break;
                case SCSI_DISK_MAJOR:
                        disk_index = (minor & 0x0070) >> 4;
                        if (disk_index < 4)
                                drive_stat_acct(req->cmd, req->nr_sectors, disk_index);
                        break;
                case IDE0_MAJOR:        /* same as HD_MAJOR */
                case XT_DISK_MAJOR:
                        disk_index = (minor & 0x0040) >> 6;
                        drive_stat_acct(req->cmd, req->nr_sectors, disk_index);
                        break;
                case IDE1_MAJOR:
                        disk_index = ((minor & 0x0040) >> 6) + 2;
                        drive_stat_acct(req->cmd, req->nr_sectors, disk_index);
                default:
                        break;
        }
 
        req->next = NULL;
        cli();
        if (req->bh)
                mark_buffer_clean(req->bh);
        if (!(tmp = dev->current_request)) {
                dev->current_request = req;
                (dev->request_fn)();
                sti();
                return;
        }
        for ( ; tmp->next ; tmp = tmp->next) {
                if ((IN_ORDER(tmp,req) ||
                    !IN_ORDER(tmp,tmp->next)) &&
                    IN_ORDER(req,tmp->next))
                        break;
        }
        req->next = tmp->next;
        tmp->next = req;
 
/* for SCSI devices, call request_fn unconditionally */
        if (scsi_blk_major(major))
                (dev->request_fn)();
 
        if ( (major >= DAC960_MAJOR+0 && major <= DAC960_MAJOR+7) ||
             (major >= COMPAQ_SMART2_MAJOR+0 && major <= COMPAQ_SMART2_MAJOR+7))
          (dev->request_fn)();
 
        sti();
}
 
static inline void attempt_merge (struct request *req,
                                  int max_sectors,
                                  int max_segments)
{
        struct request *next = req->next;
        int total_segments;
 
        if (!next)
                return;
        if (req->sector + req->nr_sectors != next->sector)
                return;
        if (next->sem || req->cmd != next->cmd || req->rq_dev != next->rq_dev ||
            req->nr_sectors + next->nr_sectors > max_sectors)
                return;
        total_segments = req->nr_segments + next->nr_segments;
        if (req->bhtail->b_data + req->bhtail->b_size == next->bh->b_data)
                total_segments--;
        if (total_segments > max_segments)
                return;
        req->bhtail->b_reqnext = next->bh;
        req->bhtail = next->bhtail;
        req->nr_sectors += next->nr_sectors;
        req->nr_segments = total_segments;
        next->rq_status = RQ_INACTIVE;
        req->next = next->next;
        wake_up (&wait_for_request);
}
 
void make_request(int major,int rw, struct buffer_head * bh)
{
        unsigned int sector, count;
        struct request * req;
        int rw_ahead, max_req, max_sectors, max_segments;
 
        count = bh->b_size >> 9;
        sector = bh->b_rsector;
 
        /* Uhhuh.. Nasty dead-lock possible here.. */
        if (buffer_locked(bh)) {
#if 0
                printk("make_request(): buffer already locked\n");
#endif
                return;
        }
        /* Maybe the above fixes it, and maybe it doesn't boot. Life is interesting */
 
        lock_buffer(bh);
 
        if (blk_size[major])
               if (blk_size[major][MINOR(bh->b_rdev)] < (sector + count)>>1) {
                        bh->b_state &= (1 << BH_Lock) | (1 << BH_FreeOnIO);
                        /* This may well happen - the kernel calls bread()
                           without checking the size of the device, e.g.,
                           when mounting a device. */
                        printk(KERN_INFO
                               "attempt to access beyond end of device\n");
                        printk(KERN_INFO "%s: rw=%d, want=%d, limit=%d\n",
                               kdevname(bh->b_rdev), rw,
                               (sector + count)>>1,
                               blk_size[major][MINOR(bh->b_rdev)]);
                        unlock_buffer(bh);
                        return;
                }
 
        rw_ahead = 0;    /* normal case; gets changed below for READA/WRITEA */
        switch (rw) {
                case READA:
                        rw_ahead = 1;
                        rw = READ;      /* drop into READ */
                case READ:
                        if (buffer_uptodate(bh)) {
#if 0
                                printk ("make_request(): buffer uptodate for READ\n");
#endif
                                unlock_buffer(bh); /* Hmmph! Already have it */
                                return;
                        }
                        kstat.pgpgin++;
                        max_req = NR_REQUEST;   /* reads take precedence */
                        break;
                case WRITEA:
                        rw_ahead = 1;
                        rw = WRITE;     /* drop into WRITE */
                case WRITE:
                        if (!buffer_dirty(bh)) {
#if 0
                                printk ("make_request(): buffer clean for WRITE\n");
#endif
                                unlock_buffer(bh); /* Hmmph! Nothing to write */
                                return;
                        }
                        /* We don't allow the write-requests to fill up the
                         * queue completely:  we want some room for reads,
                         * as they take precedence. The last third of the
                         * requests are only for reads.
                         */
                        kstat.pgpgout++;
                        max_req = (NR_REQUEST * 2) / 3;
                        break;
                default:
                        printk(KERN_ERR "make_request: bad block dev cmd,"
                               " must be R/W/RA/WA\n");
                        unlock_buffer(bh);
                        return;
        }
 
/* look for a free request. */
       /* Loop uses two requests, 1 for loop and 1 for the real device.
        * Cut max_req in half to avoid running out and deadlocking. */
        if (major == LOOP_MAJOR)
             max_req >>= 1;
 
        /*
         * Try to coalesce the new request with old requests
         */
        max_sectors = get_max_sectors(bh->b_rdev);
        max_segments = get_max_segments(bh->b_rdev);
 
        cli();
        req = blk_dev[major].current_request;
        if (!req) {
                /* MD and loop can't handle plugging without deadlocking */
                if (major != MD_MAJOR && major != LOOP_MAJOR)
                        plug_device(blk_dev + major);
        } else switch (major) {
             case IDE0_MAJOR:   /* same as HD_MAJOR */
             case IDE1_MAJOR:
             case FLOPPY_MAJOR:
             case IDE2_MAJOR:
             case IDE3_MAJOR:
                /*
                 * The scsi disk and cdrom drivers completely remove the request
                 * from the queue when they start processing an entry.  For this
                 * reason it is safe to continue to add links to the top entry for
                 * those devices.
                 *
                 * All other drivers need to jump over the first entry, as that
                 * entry may be busy being processed and we thus can't change it.
                 */
                req = req->next;
                if (!req)
                        break;
                /* fall through */
 
             case SCSI_DISK_MAJOR:
             case SCSI_CDROM_MAJOR:
             case DAC960_MAJOR+0:
             case DAC960_MAJOR+1:
             case DAC960_MAJOR+2:
             case DAC960_MAJOR+3:
             case DAC960_MAJOR+4:
             case DAC960_MAJOR+5:
             case DAC960_MAJOR+6:
             case DAC960_MAJOR+7:
             case COMPAQ_SMART2_MAJOR+0:
             case COMPAQ_SMART2_MAJOR+1:
             case COMPAQ_SMART2_MAJOR+2:
             case COMPAQ_SMART2_MAJOR+3:
             case COMPAQ_SMART2_MAJOR+4:
             case COMPAQ_SMART2_MAJOR+5:
             case COMPAQ_SMART2_MAJOR+6:
             case COMPAQ_SMART2_MAJOR+7:
                do {
                        if (req->sem)
                                continue;
                        if (req->cmd != rw)
                                continue;
                        if (req->nr_sectors + count > max_sectors)
                                continue;
                        if (req->rq_dev != bh->b_rdev)
                                continue;
                        /* Can we add it to the end of this request? */
                        if (req->sector + req->nr_sectors == sector) {
                                if (req->bhtail->b_data + req->bhtail->b_size
                                    != bh->b_data) {
                                        if (req->nr_segments < max_segments)
                                                req->nr_segments++;
                                        else continue;
                                }
                                req->bhtail->b_reqnext = bh;
                                req->bhtail = bh;
                                req->nr_sectors += count;
                                /* Can we now merge this req with the next? */
                                attempt_merge(req, max_sectors, max_segments);
                        /* or to the beginning? */
                        } else if (req->sector - count == sector) {
                                if (bh->b_data + bh->b_size
                                    != req->bh->b_data) {
                                        if (req->nr_segments < max_segments)
                                                req->nr_segments++;
                                        else continue;
                                }
                                bh->b_reqnext = req->bh;
                                req->bh = bh;
                                req->buffer = bh->b_data;
                                req->current_nr_sectors = count;
                                req->sector = sector;
                                req->nr_sectors += count;
                        } else
                                continue;
 
                        mark_buffer_clean(bh);
                        sti();
                        return;
                } while ((req = req->next) != NULL);
        }
 
/* find an unused request. */
        req = get_request(max_req, bh->b_rdev);
        sti();
 
/* if no request available: if rw_ahead, forget it; otherwise try again blocking.. */
        if (!req) {
                if (rw_ahead) {
                        unlock_buffer(bh);
                        return;
                }
                req = __get_request_wait(max_req, bh->b_rdev);
        }
 
/* fill up the request-info, and add it to the queue */
        req->cmd = rw;
        req->errors = 0;
        req->sector = sector;
        req->nr_sectors = count;
        req->nr_segments = 1;
        req->current_nr_sectors = count;
        req->buffer = bh->b_data;
        req->sem = NULL;
        req->bh = bh;
        req->bhtail = bh;
        req->next = NULL;
        add_request(major+blk_dev,req);
}
 
/* This function can be used to request a number of buffers from a block
   device. Currently the only restriction is that all buffers must belong to
   the same device */
 
void ll_rw_block(int rw, int nr, struct buffer_head * bh[])
{
        unsigned int major;
        int correct_size;
        struct blk_dev_struct * dev;
        int i;
 
        /* Make sure that the first block contains something reasonable */
        while (!*bh) {
                bh++;
                if (--nr <= 0)
                        return;
        }
 
        dev = NULL;
        if ((major = MAJOR(bh[0]->b_dev)) < MAX_BLKDEV)
                dev = blk_dev + major;
        if (!dev || !dev->request_fn) {
                printk(KERN_ERR
        "ll_rw_block: Trying to read nonexistent block-device %s (%ld)\n",
                kdevname(bh[0]->b_dev), bh[0]->b_blocknr);
                goto sorry;
        }
 
        /* Determine correct block size for this device.  */
        correct_size = BLOCK_SIZE;
        if (blksize_size[major]) {
                i = blksize_size[major][MINOR(bh[0]->b_dev)];
                if (i)
                        correct_size = i;
        }
 
        /* Verify requested block sizes.  */
        for (i = 0; i < nr; i++) {
                if (bh[i] && bh[i]->b_size != correct_size) {
                        printk(KERN_NOTICE "ll_rw_block: device %s: "
                               "only %d-char blocks implemented (%lu)\n",
                               kdevname(bh[0]->b_dev),
                               correct_size, bh[i]->b_size);
                        goto sorry;
                }
 
                /* Md remaps blocks now */
                bh[i]->b_rdev = bh[i]->b_dev;
                bh[i]->b_rsector=bh[i]->b_blocknr*(bh[i]->b_size >> 9);
#ifdef CONFIG_BLK_DEV_MD
                if (major==MD_MAJOR &&
                    md_map (MINOR(bh[i]->b_dev), &bh[i]->b_rdev,
                            &bh[i]->b_rsector, bh[i]->b_size >> 9)) {
                        printk (KERN_ERR
                                "Bad md_map in ll_rw_block\n");
                        goto sorry;
                }
#endif
        }
 
        if ((rw == WRITE || rw == WRITEA) && is_read_only(bh[0]->b_dev)) {
                printk(KERN_NOTICE "Can't write to read-only device %s\n",
                       kdevname(bh[0]->b_dev));
                goto sorry;
        }
 
        for (i = 0; i < nr; i++) {
                if (bh[i]) {
                        set_bit(BH_Req, &bh[i]->b_state);
#ifdef CONFIG_BLK_DEV_MD
                        if (MAJOR(bh[i]->b_dev) == MD_MAJOR) {
                                md_make_request(MINOR (bh[i]->b_dev), rw, bh[i]);
                                continue;
                        }
#endif
                        make_request(MAJOR(bh[i]->b_rdev), rw, bh[i]);
                }
        }
        return;
 
      sorry:
        for (i = 0; i < nr; i++) {
                if (bh[i]) {
                        clear_bit(BH_Dirty, &bh[i]->b_state);
                        clear_bit(BH_Uptodate, &bh[i]->b_state);
                }
        }
        return;
}
 
void ll_rw_swap_file(int rw, kdev_t dev, unsigned int *b, int nb, char *buf)
{
        int i, j;
        int buffersize;
        int max_req;
        unsigned long rsector;
        kdev_t rdev;
        struct request * req[8];
        unsigned int major = MAJOR(dev);
        struct semaphore sem = MUTEX_LOCKED;
 
        if (major >= MAX_BLKDEV || !(blk_dev[major].request_fn)) {
                printk(KERN_NOTICE "ll_rw_swap_file: trying to swap to"
                                   " nonexistent block-device\n");
                return;
        }
        max_req = NR_REQUEST;
        switch (rw) {
                case READ:
                        break;
                case WRITE:
                        max_req = (NR_REQUEST * 2) / 3;
                        if (is_read_only(dev)) {
                                printk(KERN_NOTICE
                                       "Can't swap to read-only device %s\n",
                                        kdevname(dev));
                                return;
                        }
                        break;
                default:
                        panic("ll_rw_swap: bad block dev cmd, must be R/W");
        }
        buffersize = PAGE_SIZE / nb;
 
        if (major == LOOP_MAJOR)
             max_req >>= 1;
        for (j=0, i=0; i<nb;)
        {
                for (; j < 8 && i < nb; j++, i++, buf += buffersize)
                {
                        rdev = dev;
                        rsector = b[i] * (buffersize >> 9);
#ifdef CONFIG_BLK_DEV_MD
                        if (major==MD_MAJOR &&
                            md_map (MINOR(dev), &rdev,
                                    &rsector, buffersize >> 9)) {
                                printk (KERN_ERR
                                        "Bad md_map in ll_rw_swap_file\n");
                                return;
                        }
#endif
 
                        if (j == 0) {
                                req[j] = get_request_wait(max_req, rdev);
                        } else {
                                cli();
                                req[j] = get_request(max_req, rdev);
                                sti();
                                if (req[j] == NULL)
                                        break;
                        }
                        req[j]->cmd = rw;
                        req[j]->errors = 0;
                        req[j]->sector = rsector;
                        req[j]->nr_sectors = buffersize >> 9;
                        req[j]->nr_segments = 1;
                        req[j]->current_nr_sectors = buffersize >> 9;
                        req[j]->buffer = buf;
                        req[j]->sem = &sem;
                        req[j]->bh = NULL;
                        req[j]->next = NULL;
                        add_request(MAJOR(rdev)+blk_dev,req[j]);
                }
                run_task_queue(&tq_disk);
                while (j > 0) {
                        j--;
                        down(&sem);
                }
        }
}
 
int blk_dev_init(void)
{
        struct request * req;
        struct blk_dev_struct *dev;
 
        for (dev = blk_dev + MAX_BLKDEV; dev-- != blk_dev;) {
                dev->request_fn      = NULL;
                dev->current_request = NULL;
                dev->plug.rq_status  = RQ_INACTIVE;
                dev->plug.cmd        = -1;
                dev->plug.next       = NULL;
                dev->plug_tq.routine = &unplug_device;
                dev->plug_tq.data    = dev;
        }
 
        req = all_requests + NR_REQUEST;
        while (--req >= all_requests) {
                req->rq_status = RQ_INACTIVE;
                req->next = NULL;
        }
        memset(ro_bits,0,sizeof(ro_bits));
#ifdef CONFIG_BLK_DEV_RAM
        rd_init();
#endif
#ifdef CONFIG_BLK_DEV_BLKMEM
        blkmem_init();
#endif
#ifdef CONFIG_DEV_FLASH
        flash_init(); /* this also does the char dev if need be */
#endif
#ifdef CONFIG_BLK_DEV_LOOP
        loop_init();
#endif
#ifdef CONFIG_CDI_INIT
        cdi_init();             /* this MUST precede ide_init */
#endif CONFIG_CDI_INIT
#ifdef CONFIG_BLK_DEV_IDE
        ide_init();             /* this MUST precede hd_init */
#endif
#ifdef CONFIG_BLK_DEV_HD
        hd_init();
#endif
#ifdef CONFIG_BLK_DEV_XD
        xd_init();
#endif
#ifdef CONFIG_PARIDE
        { extern void paride_init(void); paride_init(); };
#endif
#ifdef CONFIG_BLK_DEV_FD
        floppy_init();
#else
#ifndef CONFIG_COLDFIRE
        outb_p(0xc, 0x3f2);
#endif
#endif
#ifdef CONFIG_CDU31A
        cdu31a_init();
#endif CONFIG_CDU31A
#ifdef CONFIG_MCD
        mcd_init();
#endif CONFIG_MCD
#ifdef CONFIG_MCDX
        mcdx_init();
#endif CONFIG_MCDX
#ifdef CONFIG_SBPCD
        sbpcd_init();
#endif CONFIG_SBPCD
#ifdef CONFIG_AZTCD
        aztcd_init();
#endif CONFIG_AZTCD
#ifdef CONFIG_CDU535
        sony535_init();
#endif CONFIG_CDU535
#ifdef CONFIG_GSCD
        gscd_init();
#endif CONFIG_GSCD
#ifdef CONFIG_CM206
        cm206_init();
#endif
#ifdef CONFIG_OPTCD
        optcd_init();
#endif CONFIG_OPTCD
#ifdef CONFIG_SJCD
        sjcd_init();
#endif CONFIG_SJCD
#ifdef CONFIG_BLK_DEV_MD
        md_init();
#endif CONFIG_BLK_DEV_MD
        return 0;
}
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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [block/] [ll_rw_blk.c] - Blame information for rev 1782

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/drivers/block/ll_rw_blk.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`* Copyright (C) 1994, Karl Keyte: Added support for disk statistics`
6			`*/`
7
8			`/*`
9			`* This handles all read/write requests to block devices`
10			`*/`
11			`#include <linux/sched.h>`
12			`#include <linux/kernel.h>`
13			`#include <linux/kernel_stat.h>`
14			`#include <linux/errno.h>`
15			`#include <linux/string.h>`
16			`#include <linux/config.h>`
17			`#include <linux/locks.h>`
18			`#include <linux/mm.h>`
19
20			`#include <asm/system.h>`
21			`#include <asm/io.h>`
22			`#include <linux/blk.h>`
23
24			`/*`
25			`* The request-struct contains all necessary data`
26			`* to load a nr of sectors into memory`
27			`*/`
28			`static struct request all_requests[NR_REQUEST];`
29
30			`/*`
31			`* The "disk" task queue is used to start the actual requests`
32			`* after a plug`
33			`*/`
34			`DECLARE_TASK_QUEUE(tq_disk);`
35
36			`/*`
37			`* used to wait on when there are no free requests`
38			`*/`
39			`struct wait_queue * wait_for_request = NULL;`
40