blk.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:10k
- #ifndef _BLK_H
- #define _BLK_H
- #include <linux/blkdev.h>
- #include <linux/locks.h>
- #include <linux/config.h>
- #include <linux/spinlock.h>
- /*
- * Spinlock for protecting the request queue which
- * is mucked around with in interrupts on potentially
- * multiple CPU's..
- */
- extern spinlock_t io_request_lock;
- /*
- * Initialization functions.
- */
- extern int isp16_init(void);
- extern int cdu31a_init(void);
- extern int acsi_init(void);
- extern int mcd_init(void);
- extern int mcdx_init(void);
- extern int sbpcd_init(void);
- extern int aztcd_init(void);
- extern int sony535_init(void);
- extern int gscd_init(void);
- extern int cm206_init(void);
- extern int optcd_init(void);
- extern int sjcd_init(void);
- extern int cdi_init(void);
- extern int hd_init(void);
- extern int ide_init(void);
- extern int xd_init(void);
- extern int mfm_init(void);
- extern int loop_init(void);
- extern int md_init(void);
- extern int ap_init(void);
- extern int ddv_init(void);
- extern int z2_init(void);
- extern int swim3_init(void);
- extern int swimiop_init(void);
- extern int amiga_floppy_init(void);
- extern int atari_floppy_init(void);
- extern int ez_init(void);
- extern int bpcd_init(void);
- extern int ps2esdi_init(void);
- extern int jsfd_init(void);
- extern int viodasd_init(void);
- extern int viocd_init(void);
- #if defined(CONFIG_ARCH_S390)
- extern int dasd_init(void);
- extern int xpram_init(void);
- extern int tapeblock_init(void);
- #endif /* CONFIG_ARCH_S390 */
- extern void set_device_ro(kdev_t dev,int flag);
- void add_blkdev_randomness(int major);
- extern int floppy_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 initrd_below_start_ok; /* 1 if it is not an error if initrd_start < memory_start */
- void initrd_init(void);
- #endif
-
- /*
- * end_request() and friends. Must be called with the request queue spinlock
- * acquired. All functions called within end_request() _must_be_ atomic.
- *
- * Several drivers define their own end_request and call
- * end_that_request_first() and end_that_request_last()
- * for parts of the original function. This prevents
- * code duplication in drivers.
- */
- static inline void blkdev_dequeue_request(struct request * req)
- {
- list_del(&req->queue);
- }
- int end_that_request_first(struct request *req, int uptodate, char *name);
- void end_that_request_last(struct request *req);
- #if defined(MAJOR_NR) || defined(IDE_DRIVER)
- #undef DEVICE_ON
- #undef DEVICE_OFF
- /*
- * Add entries as needed.
- */
- #ifdef IDE_DRIVER
- #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
- #define DEVICE_NAME "ide"
- #elif (MAJOR_NR == RAMDISK_MAJOR)
- /* ram disk */
- #define DEVICE_NAME "ramdisk"
- #define DEVICE_NR(device) (MINOR(device))
- #define DEVICE_NO_RANDOM
- #elif (MAJOR_NR == Z2RAM_MAJOR)
- /* Zorro II Ram */
- #define DEVICE_NAME "Z2RAM"
- #define DEVICE_REQUEST do_z2_request
- #define DEVICE_NR(device) (MINOR(device))
- #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_OFF(device) floppy_off(DEVICE_NR(device))
- #elif (MAJOR_NR == HD_MAJOR)
- /* Hard disk: timeout is 6 seconds. */
- #define DEVICE_NAME "hard disk"
- #define DEVICE_INTR do_hd
- #define TIMEOUT_VALUE (6*HZ)
- #define DEVICE_REQUEST do_hd_request
- #define DEVICE_NR(device) (MINOR(device)>>6)
- #elif (SCSI_DISK_MAJOR(MAJOR_NR))
- #define DEVICE_NAME "scsidisk"
- #define TIMEOUT_VALUE (2*HZ)
- #define DEVICE_NR(device) (((MAJOR(device) & SD_MAJOR_MASK) << (8 - 4)) + (MINOR(device) >> 4))
- /* 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))
- #elif (MAJOR_NR == SCSI_TAPE_MAJOR)
- #define DEVICE_NAME "scsitape"
- #define DEVICE_INTR do_st
- #define DEVICE_NR(device) (MINOR(device) & 0x7f)
- #elif (MAJOR_NR == OSST_MAJOR)
- #define DEVICE_NAME "onstream"
- #define DEVICE_INTR do_osst
- #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_NR(device) (MINOR(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)
- #elif (MAJOR_NR == PS2ESDI_MAJOR)
- #define DEVICE_NAME "PS/2 ESDI"
- #define DEVICE_REQUEST do_ps2esdi_request
- #define DEVICE_NR(device) (MINOR(device) >> 6)
- #elif (MAJOR_NR == CDU31A_CDROM_MAJOR)
- #define DEVICE_NAME "CDU31A"
- #define DEVICE_REQUEST do_cdu31a_request
- #define DEVICE_NR(device) (MINOR(device))
- #elif (MAJOR_NR == ACSI_MAJOR) && (defined(CONFIG_ATARI_ACSI) || defined(CONFIG_ATARI_ACSI_MODULE))
- #define DEVICE_NAME "ACSI"
- #define DEVICE_INTR do_acsi
- #define DEVICE_REQUEST do_acsi_request
- #define DEVICE_NR(device) (MINOR(device) >> 4)
- #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))
- #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))
- #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))
- #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))
- #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))
- #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))
- #elif (MAJOR_NR == AZTECH_CDROM_MAJOR)
- #define DEVICE_NAME "Aztech CD-ROM"
- #define DEVICE_REQUEST do_aztcd_request
- #define DEVICE_NR(device) (MINOR(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))
- #elif (MAJOR_NR == GOLDSTAR_CDROM_MAJOR)
- #define DEVICE_NAME "Goldstar R420"
- #define DEVICE_REQUEST do_gscd_request
- #define DEVICE_NR(device) (MINOR(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))
- #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))
- #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))
- #elif (MAJOR_NR == APBLOCK_MAJOR)
- #define DEVICE_NAME "apblock"
- #define DEVICE_REQUEST ap_request
- #define DEVICE_NR(device) (MINOR(device))
- #elif (MAJOR_NR == DDV_MAJOR)
- #define DEVICE_NAME "ddv"
- #define DEVICE_REQUEST ddv_request
- #define DEVICE_NR(device) (MINOR(device)>>PARTN_BITS)
- #elif (MAJOR_NR == MFM_ACORN_MAJOR)
- #define DEVICE_NAME "mfm disk"
- #define DEVICE_INTR do_mfm
- #define DEVICE_REQUEST do_mfm_request
- #define DEVICE_NR(device) (MINOR(device) >> 6)
- #elif (MAJOR_NR == NBD_MAJOR)
- #define DEVICE_NAME "nbd"
- #define DEVICE_REQUEST do_nbd_request
- #define DEVICE_NR(device) (MINOR(device))
- #elif (MAJOR_NR == MDISK_MAJOR)
- #define DEVICE_NAME "mdisk"
- #define DEVICE_REQUEST mdisk_request
- #define DEVICE_NR(device) (MINOR(device))
- #elif (MAJOR_NR == DASD_MAJOR)
- #define DEVICE_NAME "dasd"
- #define DEVICE_REQUEST do_dasd_request
- #define DEVICE_NR(device) (MINOR(device) >> PARTN_BITS)
- #elif (MAJOR_NR == I2O_MAJOR)
- #define DEVICE_NAME "I2O block"
- #define DEVICE_REQUEST i2ob_request
- #define DEVICE_NR(device) (MINOR(device)>>4)
- #elif (MAJOR_NR == COMPAQ_SMART2_MAJOR)
- #define DEVICE_NAME "ida"
- #define TIMEOUT_VALUE (25*HZ)
- #define DEVICE_REQUEST do_ida_request
- #define DEVICE_NR(device) (MINOR(device) >> 4)
- #endif /* MAJOR_NR == whatever */
- /* provide DEVICE_xxx defaults, if not explicitly defined
- * above in the MAJOR_NR==xxx if-elif tree */
- #ifndef DEVICE_ON
- #define DEVICE_ON(device) do {} while (0)
- #endif
- #ifndef DEVICE_OFF
- #define DEVICE_OFF(device) do {} while (0)
- #endif
- #if (MAJOR_NR != SCSI_TAPE_MAJOR) && (MAJOR_NR != OSST_MAJOR)
- #if !defined(IDE_DRIVER)
- #ifndef CURRENT
- #define CURRENT blkdev_entry_next_request(&blk_dev[MAJOR_NR].request_queue.queue_head)
- #endif
- #ifndef QUEUE_EMPTY
- #define QUEUE_EMPTY list_empty(&blk_dev[MAJOR_NR].request_queue.queue_head)
- #endif
- #ifndef DEVICE_NAME
- #define DEVICE_NAME "unknown"
- #endif
- #define CURRENT_DEV DEVICE_NR(CURRENT->rq_dev)
- #ifdef DEVICE_INTR
- static void (*DEVICE_INTR)(void) = NULL;
- #endif
- #define SET_INTR(x) (DEVICE_INTR = (x))
- #ifdef DEVICE_REQUEST
- static void (DEVICE_REQUEST)(request_queue_t *);
- #endif
-
- #ifdef DEVICE_INTR
- #define CLEAR_INTR SET_INTR(NULL)
- #else
- #define CLEAR_INTR
- #endif
- #define INIT_REQUEST
- if (QUEUE_EMPTY) {
- 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) */
- #ifndef LOCAL_END_REQUEST /* If we have our own end_request, we do not want to include this mess */
- #if ! SCSI_BLK_MAJOR(MAJOR_NR) && (MAJOR_NR != COMPAQ_SMART2_MAJOR)
- static inline void end_request(int uptodate) {
- struct request *req = CURRENT;
- if (end_that_request_first(req, uptodate, DEVICE_NAME))
- return;
- #ifndef DEVICE_NO_RANDOM
- add_blkdev_randomness(MAJOR(req->rq_dev));
- #endif
- DEVICE_OFF(req->rq_dev);
- blkdev_dequeue_request(req);
- end_that_request_last(req);
- }
- #endif /* ! SCSI_BLK_MAJOR(MAJOR_NR) */
- #endif /* LOCAL_END_REQUEST */
- #endif /* (MAJOR_NR != SCSI_TAPE_MAJOR) */
- #endif /* defined(MAJOR_NR) || defined(IDE_DRIVER) */
- #endif /* _BLK_H */