question about ext2_find_shared

[pwp]

Hi, all

the function ext2_find_shared is located fs/ext2/inode.c 935

I see ext2_find_shared is related with truncation, but i don't know
what's the use of it.

And i am also confused with the implementation of ext2_find_shared.

It would be greatly appreciated if somebody can show me what's the use
of ext2_find_shared and how it works.

Regards

[Rubberman]

I haven't written file system drivers so I may be incorrect; however, from my glancing at the relevant code, find_shared() (redefined for each file system type, so that there is an ext2_find_shared(), ext3_find_shared(), etc.) I think that it is determining where a file may be safely truncated in the blocks allocated to it so they can be returned to the file system for reuse.

So, why do you want/need to know this? Are you writing your own file system driver?