Thanks for clearing the doubts.
Today I found that there is a fifth API by the name :
get_sb_mtd() which is used for mtd based devices. I found its usage while going through some code of JFFS2.
This API is not covered by ULK - ch12.
~Himanshu Aggarwal
On Mon, Apr 19, 2010 at 1:56 PM, Onkar Mahajan <kern.devel@xxxxxxxxx> wrote:
get_sb_bdev() = for disk based filesystems (ext3 etc most common )
get_sb_nodev() = for filesystems that can be mounted several times
(tmpfs,ramfs,smbfs etc)
get_sb_pseudo() = filesystems with no mount point (pipefs,devpts)
get_sb_single = filesystems with single mount point ( sysfs )
Hope that helps you a lot.
Regards,
Onkar
> Hi,
> I am going through the Understanding Linux Kernel, chapter 12.
> In this it describes various methods to get the superblock. These are:
> 1. get_sb_bdev()
> 2. get_sb_nodev()
> 3. get_sb_pseudo()
> 4. get_sb_single()
> I am unable to understand the difference between these. Also, what is the
> need of so many different functions? Can't we have just one function to get
> the superblock?
> Any suggestions for understanding the above concept would be helpful.
> Thanks to everyone for their suggestions.
> Regards,
> Himanshu Aggarwal
