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  1. #1

    question about ext2_find_shared

    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.


  2. #2
    Linux Guru Rubberman's Avatar
    Join Date
    Apr 2009
    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
    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?
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

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