On Tue, May 27, 2003 at 12:23:04PM -0400, Michael Zhu wrote:
> kdev_t i_dev;
> kdev_t i_rdev;
> struct block_device * i_bdev;
> struct char_device * i_cdev;
>
> My question is what is the exact difference of i_dev
> and i_rdev? Which one I should use?
man 2 stat
...
dev_t st_dev; /* device */
...
dev_t st_rdev; /* device type (if inode device) */
The difference is "device the file is located on" versus "device the
file represents".
> Another question is what that i_bdev and i_cdev are
> used for? They stand for what?
Looking at the definitions of struct block_device and struct char_device,
it appears to me that these structs are used to serialize access to the
devices and provide reference counting. This is just a guess though ..
grep through the kernel source code for uses of i_bdev and i_cdev, and
try to figure out how these variables are used...
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