diff options
Diffstat (limited to 'linux/src/include/linux/blk.h')
| -rw-r--r-- | linux/src/include/linux/blk.h | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/linux/src/include/linux/blk.h b/linux/src/include/linux/blk.h new file mode 100644 index 0000000..92634d7 --- /dev/null +++ b/linux/src/include/linux/blk.h @@ -0,0 +1,454 @@ +#ifndef _BLK_H +#define _BLK_H + +#include <linux/blkdev.h> +#include <linux/locks.h> +#include <linux/malloc.h> +#include <linux/config.h> +#include <linux/md.h> + +/* + * NR_REQUEST is the number of entries in the request-queue. + * NOTE that writes may use only the low 2/3 of these: reads + * take precedence. + */ +#define NR_REQUEST 64 + +/* + * This is used in the elevator algorithm. We don't prioritise reads + * over writes any more --- although reads are more time-critical than + * writes, by treating them equally we increase filesystem throughput. + * This turns out to give better overall performance. -- sct + */ +#define IN_ORDER(s1,s2) \ +((s1)->rq_dev < (s2)->rq_dev || (((s1)->rq_dev == (s2)->rq_dev && \ +(s1)->sector < (s2)->sector))) + +/* + * These will have to be changed to be aware of different buffer + * sizes etc.. It actually needs a major cleanup. + */ +#if defined(IDE_DRIVER) || defined(MD_DRIVER) +#define SECTOR_MASK ((BLOCK_SIZE >> 9) - 1) +#else +#define SECTOR_MASK (blksize_size[MAJOR_NR] && \ + blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] ? \ + ((blksize_size[MAJOR_NR][MINOR(CURRENT->rq_dev)] >> 9) - 1) : \ + ((BLOCK_SIZE >> 9) - 1)) +#endif /* IDE_DRIVER */ + +#define SUBSECTOR(block) (CURRENT->current_nr_sectors > 0) + +#ifdef CONFIG_CDU31A +extern int cdu31a_init(void); +#endif CONFIG_CDU31A +#ifdef CONFIG_MCD +extern int mcd_init(void); +#endif CONFIG_MCD +#ifdef CONFIG_MCDX +extern int mcdx_init(void); +#endif CONFIG_MCDX +#ifdef CONFIG_SBPCD +extern int sbpcd_init(void); +#endif CONFIG_SBPCD +#ifdef CONFIG_AZTCD +extern int aztcd_init(void); +#endif CONFIG_AZTCD +#ifdef CONFIG_CDU535 +extern int sony535_init(void); +#endif CONFIG_CDU535 +#ifdef CONFIG_GSCD +extern int gscd_init(void); +#endif CONFIG_GSCD +#ifdef CONFIG_CM206 +extern int cm206_init(void); +#endif CONFIG_CM206 +#ifdef CONFIG_OPTCD +extern int optcd_init(void); +#endif CONFIG_OPTCD +#ifdef CONFIG_SJCD +extern int sjcd_init(void); +#endif CONFIG_SJCD +#ifdef CONFIG_CDI_INIT +extern int cdi_init(void); +#endif CONFIG_CDI_INIT +#ifdef CONFIG_BLK_DEV_HD +extern int hd_init(void); +#endif +#ifdef CONFIG_BLK_DEV_IDE +extern int ide_init(void); +#endif +#ifdef CONFIG_BLK_DEV_XD +extern int xd_init(void); +#endif +#ifdef CONFIG_BLK_DEV_LOOP +extern int loop_init(void); +#endif +#ifdef CONFIG_BLK_DEV_MD +extern int md_init(void); +#endif CONFIG_BLK_DEV_MD + +extern void set_device_ro(kdev_t dev,int flag); +void add_blkdev_randomness(int major); + +extern int floppy_init(void); +extern void rd_load(void); +extern int rd_init(void); +extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */ +extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */ +extern int rd_image_start; /* starting block # of image */ + +#ifdef CONFIG_BLK_DEV_INITRD + +#define INITRD_MINOR 250 /* shouldn't collide with /dev/ram* too soon ... */ + +extern unsigned long initrd_start,initrd_end; +extern int mount_initrd; /* zero if initrd should not be mounted */ +void initrd_init(void); + +#endif + +#define RO_IOCTLS(dev,where) \ + case BLKROSET: { int __err; if (!suser()) return -EACCES; \ + __err = verify_area(VERIFY_READ, (void *) (where), sizeof(long)); \ + if (!__err) set_device_ro((dev),get_fs_long((long *) (where))); return __err; } \ + case BLKROGET: { int __err = verify_area(VERIFY_WRITE, (void *) (where), sizeof(long)); \ + if (!__err) put_fs_long(0!=is_read_only(dev),(long *) (where)); return __err; } + +#if defined(MAJOR_NR) || defined(IDE_DRIVER) + +/* + * Add entries as needed. + */ + +#ifdef IDE_DRIVER + +#define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS) +#define DEVICE_ON(device) /* nothing */ +#define DEVICE_OFF(device) /* nothing */ + +#elif (MAJOR_NR == RAMDISK_MAJOR) + +/* ram disk */ +#define DEVICE_NAME "ramdisk" +#define DEVICE_REQUEST rd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) +#define DEVICE_NO_RANDOM + +#elif (MAJOR_NR == FLOPPY_MAJOR) + +static void floppy_off(unsigned int nr); + +#define DEVICE_NAME "floppy" +#define DEVICE_INTR do_floppy +#define DEVICE_REQUEST do_fd_request +#define DEVICE_NR(device) ( (MINOR(device) & 3) | ((MINOR(device) & 0x80 ) >> 5 )) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) floppy_off(DEVICE_NR(device)) + +#elif (MAJOR_NR == HD_MAJOR) + +/* harddisk: timeout is 6 seconds.. */ +#define DEVICE_NAME "harddisk" +#define DEVICE_INTR do_hd +#define DEVICE_TIMEOUT HD_TIMER +#define TIMEOUT_VALUE (6*HZ) +#define DEVICE_REQUEST do_hd_request +#define DEVICE_NR(device) (MINOR(device)>>6) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == SCSI_DISK_MAJOR) + +#define DEVICE_NAME "scsidisk" +#define DEVICE_INTR do_sd +#define TIMEOUT_VALUE (2*HZ) +#define DEVICE_REQUEST do_sd_request +#define DEVICE_NR(device) (MINOR(device) >> 4) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +/* Kludge to use the same number for both char and block major numbers */ +#elif (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER) + +#define DEVICE_NAME "Multiple devices driver" +#define DEVICE_REQUEST do_md_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == SCSI_TAPE_MAJOR) + +#define DEVICE_NAME "scsitape" +#define DEVICE_INTR do_st +#define DEVICE_NR(device) (MINOR(device) & 0x7f) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == SCSI_CDROM_MAJOR) + +#define DEVICE_NAME "CD-ROM" +#define DEVICE_INTR do_sr +#define DEVICE_REQUEST do_sr_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == XT_DISK_MAJOR) + +#define DEVICE_NAME "xt disk" +#define DEVICE_REQUEST do_xd_request +#define DEVICE_NR(device) (MINOR(device) >> 6) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == CDU31A_CDROM_MAJOR) + +#define DEVICE_NAME "CDU31A" +#define DEVICE_REQUEST do_cdu31a_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == MITSUMI_CDROM_MAJOR) + +#define DEVICE_NAME "Mitsumi CD-ROM" +/* #define DEVICE_INTR do_mcd */ +#define DEVICE_REQUEST do_mcd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == MITSUMI_X_CDROM_MAJOR) + +#define DEVICE_NAME "Mitsumi CD-ROM" +/* #define DEVICE_INTR do_mcdx */ +#define DEVICE_REQUEST do_mcdx_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == MATSUSHITA_CDROM_MAJOR) + +#define DEVICE_NAME "Matsushita CD-ROM controller #1" +#define DEVICE_REQUEST do_sbpcd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == MATSUSHITA_CDROM2_MAJOR) + +#define DEVICE_NAME "Matsushita CD-ROM controller #2" +#define DEVICE_REQUEST do_sbpcd2_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == MATSUSHITA_CDROM3_MAJOR) + +#define DEVICE_NAME "Matsushita CD-ROM controller #3" +#define DEVICE_REQUEST do_sbpcd3_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == MATSUSHITA_CDROM4_MAJOR) + +#define DEVICE_NAME "Matsushita CD-ROM controller #4" +#define DEVICE_REQUEST do_sbpcd4_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == AZTECH_CDROM_MAJOR) + +#define DEVICE_NAME "Aztech CD-ROM" +#define DEVICE_REQUEST do_aztcd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == CDU535_CDROM_MAJOR) + +#define DEVICE_NAME "SONY-CDU535" +#define DEVICE_INTR do_cdu535 +#define DEVICE_REQUEST do_cdu535_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR) + +#define DEVICE_NAME "Goldstar R420" +#define DEVICE_REQUEST do_gscd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == CM206_CDROM_MAJOR) +#define DEVICE_NAME "Philips/LMS cd-rom cm206" +#define DEVICE_REQUEST do_cm206_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == OPTICS_CDROM_MAJOR) + +#define DEVICE_NAME "DOLPHIN 8000AT CD-ROM" +#define DEVICE_REQUEST do_optcd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#elif (MAJOR_NR == SANYO_CDROM_MAJOR) + +#define DEVICE_NAME "Sanyo H94A CD-ROM" +#define DEVICE_REQUEST do_sjcd_request +#define DEVICE_NR(device) (MINOR(device)) +#define DEVICE_ON(device) +#define DEVICE_OFF(device) + +#endif /* MAJOR_NR == whatever */ + +#if (MAJOR_NR != SCSI_TAPE_MAJOR) +#if !defined(IDE_DRIVER) + +#ifndef CURRENT +#define CURRENT (blk_dev[MAJOR_NR].current_request) +#endif + +#define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev) + +#ifdef DEVICE_INTR +static void (*DEVICE_INTR)(void) = NULL; +#endif +#ifdef DEVICE_TIMEOUT + +#define SET_TIMER \ +((timer_table[DEVICE_TIMEOUT].expires = jiffies + TIMEOUT_VALUE), \ +(timer_active |= 1<<DEVICE_TIMEOUT)) + +#define CLEAR_TIMER \ +timer_active &= ~(1<<DEVICE_TIMEOUT) + +#define SET_INTR(x) \ +if ((DEVICE_INTR = (x)) != NULL) \ + SET_TIMER; \ +else \ + CLEAR_TIMER; + +#else + +#define SET_INTR(x) (DEVICE_INTR = (x)) + +#endif /* DEVICE_TIMEOUT */ + +static void (DEVICE_REQUEST)(void); + +#ifdef DEVICE_INTR +#define CLEAR_INTR SET_INTR(NULL) +#else +#define CLEAR_INTR +#endif + +#define INIT_REQUEST \ + if (!CURRENT) {\ + CLEAR_INTR; \ + return; \ + } \ + if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) \ + panic(DEVICE_NAME ": request list destroyed"); \ + if (CURRENT->bh) { \ + if (!buffer_locked(CURRENT->bh)) \ + panic(DEVICE_NAME ": block not locked"); \ + } + +#endif /* !defined(IDE_DRIVER) */ + +/* end_request() - SCSI devices have their own version */ +/* - IDE drivers have their own copy too */ + +#if ! SCSI_BLK_MAJOR(MAJOR_NR) + +#if defined(IDE_DRIVER) && !defined(_IDE_C) /* shared copy for IDE modules */ +void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup); +#else + +#ifdef IDE_DRIVER +void ide_end_request(byte uptodate, ide_hwgroup_t *hwgroup) { + struct request *req = hwgroup->rq; +#else +static void end_request(int uptodate) { + struct request *req = CURRENT; +#endif /* IDE_DRIVER */ + struct buffer_head * bh; + int nsect; + + req->errors = 0; + if (!uptodate) { + printk("end_request: I/O error, dev %s, sector %lu\n", + kdevname(req->rq_dev), req->sector); + if ((bh = req->bh) != NULL) { + nsect = bh->b_size >> 9; + req->nr_sectors--; + req->nr_sectors &= ~(nsect - 1); + req->sector += nsect; + req->sector &= ~(nsect - 1); + } + } + + if ((bh = req->bh) != NULL) { + req->bh = bh->b_reqnext; + bh->b_reqnext = NULL; + + /* + * This is our 'MD IO has finished' event handler. + * note that b_state should be cached in a register + * anyways, so the overhead if this checking is almost + * zero. But anyways .. we never get OO for free :) + */ + if (test_bit(BH_MD, &bh->b_state)) { + struct md_personality * pers=(struct md_personality *)bh->personality; + pers->end_request(bh,uptodate); + } + /* + * the normal (nonmirrored and no RAID5) case: + */ + else { + mark_buffer_uptodate(bh, uptodate); + unlock_buffer(bh); + } + if ((bh = req->bh) != NULL) { + req->current_nr_sectors = bh->b_size >> 9; + if (req->nr_sectors < req->current_nr_sectors) { + req->nr_sectors = req->current_nr_sectors; + printk("end_request: buffer-list destroyed\n"); + } + req->buffer = bh->b_data; + return; + } + } +#ifndef DEVICE_NO_RANDOM + add_blkdev_randomness(MAJOR(req->rq_dev)); +#endif +#ifdef IDE_DRIVER + blk_dev[MAJOR(req->rq_dev)].current_request = req->next; + hwgroup->rq = NULL; +#else + DEVICE_OFF(req->rq_dev); + CURRENT = req->next; +#endif /* IDE_DRIVER */ + if (req->sem != NULL) + up(req->sem); + req->rq_status = RQ_INACTIVE; + wake_up(&wait_for_request); +} +#endif /* defined(IDE_DRIVER) && !defined(_IDE_C) */ +#endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */ +#endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */ + +#endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */ + +#endif /* _BLK_H */ |