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minix/drivers/filter/inc.h

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Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
/* Filter driver - general include file */
#define _MINIX 1
#define _SYSTEM 1
#include <minix/config.h>
#include <minix/const.h>
#include <minix/type.h>
#include <minix/com.h>
#include <minix/ipc.h>
#include <sys/ioc_disk.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <minix/partition.h>
#include <minix/ds.h>
#include <minix/callnr.h>
Split block/character protocols and libdriver This patch separates the character and block driver communication protocols. The old character protocol remains the same, but a new block protocol is introduced. The libdriver library is replaced by two new libraries: libchardriver and libblockdriver. Their exposed API, and drivers that use them, have been updated accordingly. Together, libbdev and libblockdriver now completely abstract away the message format used by the block protocol. As the memory driver is both a character and a block device driver, it now implements its own message loop. The most important semantic change made to the block protocol is that it is no longer possible to return both partial results and an error for a single transfer. This simplifies the interaction between the caller and the driver, as the I/O vector no longer needs to be copied back. Also, drivers are now no longer supposed to decide based on the layout of the I/O vector when a transfer should be cut short. Put simply, transfers are now supposed to either succeed completely, or result in an error. After this patch, the state of the various pieces is as follows: - block protocol: stable - libbdev API: stable for synchronous communication - libblockdriver API: needs slight revision (the drvlib/partition API in particular; the threading API will also change shortly) - character protocol: needs cleanup - libchardriver API: needs cleanup accordingly - driver restarts: largely unsupported until endpoint changes are reintroduced As a side effect, this patch eliminates several bugs, hacks, and gcc -Wall and -W warnings all over the place. It probably introduces a few new ones, too. Update warning: this patch changes the protocol between MFS and disk drivers, so in order to use old/new images, the MFS from the ramdisk must be used to mount all file systems.
2011-11-22 13:27:53 +01:00
#include <minix/blockdriver.h>
Move optset.c into libsys; remove redundant copies
2011-11-07 16:16:08 +01:00
#include <minix/optset.h>
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#define SECTOR_SIZE 512
Rewrite some functions to ANSI style.
2010-01-27 11:19:13 +01:00
typedef enum {
Filter driver updates: - optionally vectorize I/O requests to work around hardware bugs - extend default buffer size to cover MFS's default maximum request size - use mmap directly, rather than alloc_contig - add 'nil' checksum type for comparison with layout - minor style corrections
2009-12-22 00:30:01 +01:00
ST_NIL, /* Zero checksums */
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
ST_XOR, /* XOR-based checksums */
ST_CRC, /* CRC32-based checksums */
ST_MD5 /* MD5-based checksums */
Rewrite some functions to ANSI style.
2010-01-27 11:19:13 +01:00
} checksum_type;
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
Rewrite some functions to ANSI style.
2010-01-27 11:19:13 +01:00
typedef enum {
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
FLT_WRITE, /* write to up to two disks */
FLT_READ, /* read from one disk */
FLT_READ2 /* read from both disks */
Rewrite some functions to ANSI style.
2010-01-27 11:19:13 +01:00
} disk_operation;
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
Driver refactory for live update and crash recovery. SYSLIB CHANGES: - DS calls to publish / retrieve labels consider endpoints instead of u32_t. VFS CHANGES: - mapdriver() only adds an entry in the dmap table in VFS. - dev_up() is only executed upon reception of a driver up event. INET CHANGES: - INET no longer searches for existing drivers instances at startup. - A newtwork driver is (re)initialized upon reception of a driver up event. - Networking startup is now race-free by design. No need to waste 5 seconds at startup any more. DRIVER CHANGES: - Every driver publishes driver up events when starting for the first time or in case of restart when recovery actions must be taken in the upper layers. - Driver up events are published by drivers through DS. - For regular drivers, VFS is normally the only subscriber, but not necessarily. For instance, when the filter driver is in use, it must subscribe to driver up events to initiate recovery. - For network drivers, inet is the only subscriber for now. - Every VFS driver is statically linked with libdriver, every network driver is statically linked with libnetdriver. DRIVER LIBRARIES CHANGES: - Libdriver is extended to provide generic receive() and ds_publish() interfaces for VFS drivers. - driver_receive() is a wrapper for sef_receive() also used in driver_task() to discard spurious messages that were meant to be delivered to a previous version of the driver. - driver_receive_mq() is the same as driver_receive() but integrates support for queued messages. - driver_announce() publishes a driver up event for VFS drivers and marks the driver as initialized and expecting a DEV_OPEN message. - Libnetdriver is introduced to provide similar receive() and ds_publish() interfaces for network drivers (netdriver_announce() and netdriver_receive()). - Network drivers all support live update with no state transfer now. KERNEL CHANGES: - Added kernel call statectl for state management. Used by driver_announce() to unblock eventual callers sendrecing to the driver.
2010-04-08 15:41:35 +02:00
struct driverinfo {
char *label;
int minor;
endpoint_t endpt;
int up_event;
int problem; /* one of BD_* */
int error; /* one of E*, only relevant if problem>0 */
int retries;
int kills;
};
/* UP event characterization. */
#define UP_EXPECTED 0
#define UP_NONE 1
#define UP_PENDING 2
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
/* Something was wrong and the disk driver has been restarted/refreshed,
* so the request needs to be redone.
*/
#define RET_REDO 1
/* The cases where the disk driver need to be restarted/refreshed by RS.
* BD_DEAD: the disk driver has died. Restart it.
* BD_PROTO: a protocol error has occurred. Refresh it.
* BD_DATA: a data error has occurred. Refresh it.
*/
Rewrite some functions to ANSI style.
2010-01-27 11:19:13 +01:00
typedef enum {
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
BD_NONE,
BD_DEAD,
BD_PROTO,
BD_DATA,
BD_LAST
Rewrite some functions to ANSI style.
2010-01-27 11:19:13 +01:00
} driver_state;
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
#define DRIVER_MAIN 0
#define DRIVER_BACKUP 1
Filter driver updates: - optionally vectorize I/O requests to work around hardware bugs - extend default buffer size to cover MFS's default maximum request size - use mmap directly, rather than alloc_contig - add 'nil' checksum type for comparison with layout - minor style corrections
2009-12-22 00:30:01 +01:00
/* Requests for more than this many bytes will be allocated dynamically. */
#define BUF_SIZE (256 * 1024)
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
#define SBUF_SIZE (BUF_SIZE * 2)
#define LABEL_SIZE 32
typedef unsigned long sector_t;
/* main.c */
extern int USE_CHECKSUM;
extern int USE_MIRROR;
extern int BAD_SUM_ERROR;
extern int USE_SUM_LAYOUT;
extern int SUM_TYPE;
extern int SUM_SIZE;
extern int NR_SUM_SEC;
extern int NR_RETRIES;
extern int NR_RESTARTS;
extern int DRIVER_TIMEOUT;
Filter driver updates: - optionally vectorize I/O requests to work around hardware bugs - extend default buffer size to cover MFS's default maximum request size - use mmap directly, rather than alloc_contig - add 'nil' checksum type for comparison with layout - minor style corrections
2009-12-22 00:30:01 +01:00
extern int CHUNK_SIZE;
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
extern char MAIN_LABEL[LABEL_SIZE];
extern char BACKUP_LABEL[LABEL_SIZE];
extern int MAIN_MINOR;
extern int BACKUP_MINOR;
/* sum.c */
extern void sum_init(void);
extern int transfer(u64_t pos, char *buffer, size_t *sizep, int flag_rw);
extern u64_t convert(u64_t size);
/* driver.c */
extern void driver_init(void);
extern void driver_shutdown(void);
extern u64_t get_raw_size(void);
extern void reset_kills(void);
extern int check_driver(int which);
extern int bad_driver(int which, int type, int error);
extern int read_write(u64_t pos, char *bufa, char *bufb, size_t *sizep,
int flag_rw);
Driver refactory for live update and crash recovery. SYSLIB CHANGES: - DS calls to publish / retrieve labels consider endpoints instead of u32_t. VFS CHANGES: - mapdriver() only adds an entry in the dmap table in VFS. - dev_up() is only executed upon reception of a driver up event. INET CHANGES: - INET no longer searches for existing drivers instances at startup. - A newtwork driver is (re)initialized upon reception of a driver up event. - Networking startup is now race-free by design. No need to waste 5 seconds at startup any more. DRIVER CHANGES: - Every driver publishes driver up events when starting for the first time or in case of restart when recovery actions must be taken in the upper layers. - Driver up events are published by drivers through DS. - For regular drivers, VFS is normally the only subscriber, but not necessarily. For instance, when the filter driver is in use, it must subscribe to driver up events to initiate recovery. - For network drivers, inet is the only subscriber for now. - Every VFS driver is statically linked with libdriver, every network driver is statically linked with libnetdriver. DRIVER LIBRARIES CHANGES: - Libdriver is extended to provide generic receive() and ds_publish() interfaces for VFS drivers. - driver_receive() is a wrapper for sef_receive() also used in driver_task() to discard spurious messages that were meant to be delivered to a previous version of the driver. - driver_receive_mq() is the same as driver_receive() but integrates support for queued messages. - driver_announce() publishes a driver up event for VFS drivers and marks the driver as initialized and expecting a DEV_OPEN message. - Libnetdriver is introduced to provide similar receive() and ds_publish() interfaces for network drivers (netdriver_announce() and netdriver_receive()). - Network drivers all support live update with no state transfer now. KERNEL CHANGES: - Added kernel call statectl for state management. Used by driver_announce() to unblock eventual callers sendrecing to the driver.
2010-04-08 15:41:35 +02:00
extern void ds_event(void);
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
/* util.c */
extern char *flt_malloc(size_t size, char *sbuf, size_t ssize);
Removed unused variables, added const where possible.
2010-04-07 13:25:51 +02:00
extern void flt_free(char *buf, size_t size, const char *sbuf);
Filter driver by Wu Bingzheng et al
2009-12-02 11:08:58 +01:00
extern clock_t flt_alarm(clock_t dt);
Driver refactory for live update and crash recovery. SYSLIB CHANGES: - DS calls to publish / retrieve labels consider endpoints instead of u32_t. VFS CHANGES: - mapdriver() only adds an entry in the dmap table in VFS. - dev_up() is only executed upon reception of a driver up event. INET CHANGES: - INET no longer searches for existing drivers instances at startup. - A newtwork driver is (re)initialized upon reception of a driver up event. - Networking startup is now race-free by design. No need to waste 5 seconds at startup any more. DRIVER CHANGES: - Every driver publishes driver up events when starting for the first time or in case of restart when recovery actions must be taken in the upper layers. - Driver up events are published by drivers through DS. - For regular drivers, VFS is normally the only subscriber, but not necessarily. For instance, when the filter driver is in use, it must subscribe to driver up events to initiate recovery. - For network drivers, inet is the only subscriber for now. - Every VFS driver is statically linked with libdriver, every network driver is statically linked with libnetdriver. DRIVER LIBRARIES CHANGES: - Libdriver is extended to provide generic receive() and ds_publish() interfaces for VFS drivers. - driver_receive() is a wrapper for sef_receive() also used in driver_task() to discard spurious messages that were meant to be delivered to a previous version of the driver. - driver_receive_mq() is the same as driver_receive() but integrates support for queued messages. - driver_announce() publishes a driver up event for VFS drivers and marks the driver as initialized and expecting a DEV_OPEN message. - Libnetdriver is introduced to provide similar receive() and ds_publish() interfaces for network drivers (netdriver_announce() and netdriver_receive()). - Network drivers all support live update with no state transfer now. KERNEL CHANGES: - Added kernel call statectl for state management. Used by driver_announce() to unblock eventual callers sendrecing to the driver.
2010-04-08 15:41:35 +02:00
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