Messages in this thread | | | Date | Thu, 27 Oct 2005 19:05:16 +0100 | From | Paulo da Silva <> | Subject | Learning ext2 fs |
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I am reading the ext2 fs code. One of my purposes is to save the original data of a file to another file just before it is changed by write/mmap/whatever. Because of mmap (any other reasons?) I thought of doing this at "ext2-writepage" or/and "ext2-writepages".
Is this the right place? Is there a lower level where I can read/write blocks of data from/to hd instead of full pages?
How do I tell the really file data from other data?
I traced these functions but I only got "ext2-writepages" to be called. "ext2-writepage" was never called using the programs I wrote to test this. When is "ext2-writepage" called?
Thanks for any help. Any readings advice is also welcome.
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