On Sat, 25 May 2013 23:56:50 +0530, Dibyayan Chakraborty said: > The main purpose is to replicate the super_block and other important > information so that it can be recovered in case of data corruption. Other > purpose is to enable efficient storage in order to minimize defragmentation > and head seek time. > > My questions are : > > Are there any other purpose of this ? What, that isn't reason enough? ;) > How it is possible to detect that there is some corruption in the main > super_block information ? Is some kind of check sum is used ? What is the > standard way of doing it ? In fs/ext4/super.c, see the various ext4_superblock_csum-* functions and their callers, around line 115 to 160 or so. Figuring out what other filesystems do is left as an exercise for the reader. ;)
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