4005bba437
This removes a race condition when the block driver performs a complete restart after a crash (the new default). If any user of the driver finds out its new endpoint and sends a request to the new driver instance before this instance has had the chance to initialize, then its initialization would clear all IPC state and thereby erroneously cancel the incoming request. Clearing IPC state is only desired upon a stateful restart (where the driver's endpoint is retained). This information is now passed to and used by libblockdriver accordingly.
62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
#ifndef _MINIX_BLOCKDRIVER_H
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#define _MINIX_BLOCKDRIVER_H
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#include <minix/driver.h>
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typedef int thread_id_t;
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/* Types supported for the 'type' field of struct blockdriver. */
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typedef enum {
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BLOCKDRIVER_TYPE_DISK, /* handle partition requests */
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BLOCKDRIVER_TYPE_OTHER /* do not handle partition requests */
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} blockdriver_type_t;
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/* Entry points into the device dependent code of block drivers. */
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struct blockdriver {
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blockdriver_type_t bdr_type;
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_PROTOTYPE( int (*bdr_open), (dev_t minor, int access) );
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_PROTOTYPE( int (*bdr_close), (dev_t minor) );
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_PROTOTYPE( ssize_t (*bdr_transfer), (dev_t minor, int do_write, u64_t pos,
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endpoint_t endpt, iovec_t *iov, unsigned count, int flags) );
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_PROTOTYPE( int (*bdr_ioctl), (dev_t minor, unsigned int request,
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endpoint_t endpt, cp_grant_id_t grant) );
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_PROTOTYPE( void (*bdr_cleanup), (void) );
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_PROTOTYPE( struct device *(*bdr_part), (dev_t minor) );
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_PROTOTYPE( void (*bdr_geometry), (dev_t minor, struct partition *part) );
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_PROTOTYPE( void (*bdr_intr), (unsigned int irqs) );
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_PROTOTYPE( void (*bdr_alarm), (clock_t stamp) );
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_PROTOTYPE( int (*bdr_other), (message *m_ptr) );
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_PROTOTYPE( int (*bdr_thread), (dev_t minor, thread_id_t *threadp) );
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};
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/* Functions defined by libblockdriver. These can be used for both
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* singlethreaded and multithreaded drivers.
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*/
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_PROTOTYPE( void blockdriver_announce, (int type) );
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#ifndef _BLOCKDRIVER_MT_API
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/* Additional functions for the singlethreaded version. These allow the driver
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* to either use the stock driver_task(), or implement its own message loop.
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* To avoid accidents, these functions are not exposed when minix/driver_mt.h
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* has been included previously.
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*/
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_PROTOTYPE( int blockdriver_receive_mq, (message *m_ptr, int *status_ptr) );
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_PROTOTYPE( void blockdriver_process, (struct blockdriver *dp, message *m_ptr,
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int ipc_status) );
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_PROTOTYPE( void blockdriver_terminate, (void) );
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_PROTOTYPE( void blockdriver_task, (struct blockdriver *bdp) );
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_PROTOTYPE( int blockdriver_mq_queue, (message *m_ptr, int status) );
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#endif /* !_BLOCKDRIVER_MT_API */
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/* Parameters for the disk drive. */
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#define SECTOR_SIZE 512 /* physical sector size in bytes */
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#define SECTOR_SHIFT 9 /* for division */
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#define SECTOR_MASK 511 /* and remainder */
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#define CD_SECTOR_SIZE 2048 /* sector size of a CD-ROM in bytes */
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/* Size of the DMA buffer buffer in bytes. */
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#define DMA_BUF_SIZE (DMA_SECTORS * SECTOR_SIZE)
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#endif /* _MINIX_BLOCKDRIVER_H */
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