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LINUX Application
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LINUX VFS
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File System (vfat/ext2/cramfs..)
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Block Device Driver
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LLD from vendor
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Hardware
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1. ÀûÓÃmodule_initºê½«É豸µÄ³õʼ»¯º¯Êýmydev_init×¢²áµ½kernel¾µÏñµÄ.init¶Î¡£µ±È»£¬»¹ÒªÀûÓÃmodule_exitºê×¢²áÈ¥³õʼ»¯º¯Êýmydev_cleanup¡£(ref: linux/init.h)
2. Ìî³ä³õʼ»¯º¯Êýmydev_init£¬Íê³ÉÒÔÏÂÈýÏ×÷
2.1 ʹÓÃregister_blkdev×¢²á¿éÉ豸ºÅºÍÉ豸Ãû¡£¡¡(ref: drivers/block/genhd.c)
2.2 ÉèÖÃqueue£ºÖ÷ÒªÊÇ»ñÈ¡queue²¢ÉèÖÃrequestº¯Êý£¬ÉèÖÃsector´óСµÈ¡£¡¡(ref: drivers/block/ll_rw_blk.c)
2.3 Ìí¼Ódisk£ºadd_disk¡£ (ref: drivers/block/genhd.c)
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a) struct request_queue (ref: linux/blkdev.h)£¬ 2.2ÖеÄqueue½á¹¹
b) struct gendisk (ref: linux/genhd.h)£¬ 2.3ÖеÄdisk½á¹¹£¬¹Ø×¢³ÉÔ± ->
major/first_minor/minors <- É豸ºÅ;
fopsÖ¸Õë <- ¿éÉ豸²Ù×÷º¯ÊýÖ¸Õë×é
queueÖ¸Õë <- 2.2ÖеÄqueue
private_dataÖ¸Õë <- ´æ´¢Óë¾ßÌåÉ豸Ïà¹ØµÄÊý¾Ý½á¹¹
c) struct mydev_dev,¼´b)ÖеľßÌåÉ豸Ïà¹ØµÄÊý¾Ý½á¹¹£¬Í¨³£°üº¬³ÉÔ±
size <- É豸ÖÐsectorµÄÊýÄ¿
users <- ʹÓÃÉ豸µÄÓû§ÊýÄ¿
media_change <- media change񈬀
lock <- ×ÔÐýËø
queue Ö¸Õë <- É豸µÄstruct request_queueÖ¸Õë
disk Ö¸Õë <- É豸µÄstruct gendiskÖ¸Õë
3. LINUX¿éÉ豸Çý¶¯µÄ²Ù×÷º¯ÊýÖ¸Õë×é
open: É豸´ò¿ªÊ±±»µ÷Óã¬Ö÷Òª¹¦ÄÜΪ³õʼ»¯µ×²ãÉ豸£»»òÈ¡µ×²ãÉ豸ÐÅÏ¢
release: É豸¹Ø±Õʱ±»µ÷Óá£
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