AFAIK, open calls library wrapper [if therez any] and then that calls sys_open call which actually calls device_operations struct of the driver attached to this device file "/dev/hda". FYI, This binding has been made during the insmod time [as you have used device_operations struct in your driver for a Major no and would have initialized blk_dev_queue for pending I/Os]. Now, when you do read(), sys_read and then driver specific read will be called. In this case it's generic_file_read only... Thanks. Sumit Sharma, IBM, Bangalore. On Wed, 29 Sep 2004 manish regmi wrote : >Hi, > Can anybody explain me how read operation on Block device (say ide >device) work. >The read file operations of Block device is set to generic_file_read, >i.e nothing. and the ide driver does not have read routine. >Then, How Block device driver or Ide Driver reads the data? > >for eg in this type of app. >i = open(/dev/hda, O_RDONLY); >read(i ,....); > >Thanks in advance. > >-- >Kernelnewbies: Help each other learn about the Linux kernel. >Archive: http://mail.nl.linux.org/kernelnewbies/ >FAQ: http://kernelnewbies.org/faq/ >
