Address space operations questions

[Martin Jambor <jamborm@gmail.com>]

Hi,

I have problems understanding the purpose of different entries of
struc address_space_operations in 2.6 kernels:

1. What is bmap for and what is it supposed to do?

2. What is the difference between sync_page and write_page?

3. What exactly (fs independent) is the relation in between
write_page, prepare_write and commit_write? Does prepare make sure a
page can be written (like allocating space), commit mark it dirty a
write write it sometime later on?

Thak you very much for any insight,

Martin

P.S.: I have dedicated a lot of time searching for any documentation,
tried IRC forums and even bought a book without getting a truly good
answer to the above questions. Oh yeah, I read a lot of the source
even though not all of it yet :-) On the other hand, if you find this
question inappropriate for this mailing list (too basic, perhaps),
please let me know.