dirty buffer_head, but not marked dirty

[Mark B <mark@lemna.hr>]

Hi!

One quick question.

Someone takes a buffer_head via sb_bread(),
modifies the data in it (b_data), and then decides that the modifications are 
not ok, so we want the old one back... 
Is there a function to mark the data trashed or should we simply release it 
with brelse()? 
I think brelse() is not good to do (someone else (or we) may get the trashed 
data with the next call from sb_bread() )

Would something like reiserfs_unmap_buffer() do the job correctly(would it 
force to reread the buffer)?

(I know I could easily keep a copy of it or reverse the changes, but the 
changes are through more blocks, so it would be much harder to restore the 
situation by calling some trash() function on them)


-- 
Mark Burazin 
mark@lemna.hr
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Lemna d.o.o.
http://www.lemna.biz - info@lemna.hr
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