Hi, >-----Original Message----- >From: raja [mailto:vnagaraju@xxxxxxxxxxxx] >Sent: Saturday, September 17, 2005 10:34 AM >To: kernelnewbies@xxxxxxxxxxxx >Subject: block device drivers > >Hi, > I am trying to implement a linux block device driver.And I have >some doubts while understanding the drivers.I am listing them.Will you >please help me. > >1.In the struct gendisk structure wht is the field >int first_minor; > refer to? >is it the first partion number?wht is the partion number mean? first_minor denotes the starting minor device number for this gendisk. For e.g. if you initialize first_minor with 5 and you create 2 partitions on this disk, then the disk will have minor number 5 and the two partitions will have minor number 6 and 7. This basically decides how minor numbers are allocated. > >and wht is the field minors refer to? "minors" refer to maximum number of partitions possible on the disk Please correct me if I am wrong. Sanjay > >and while implementing in a sample driver they are using >dev->gd->first_minor = which*NUM_OF_MINORS; >where gd is the reference to gendisk structure >wht is the word 'which' refer to and in which file it is defined? > >i am using the >set_capacity(dev->gd, nsectors*(hardsect_size/KERNEL_SECTOR_SIZE)); >then >and i am getting the error undefined symbol KERNEL_SECTOR_SIZE. >where it is located. > > > > >-- >Kernelnewbies: Help each other learn about the Linux kernel. >Archive: http://mail.nl.linux.org/kernelnewbies/ >FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
