This may break a lot of stuff, particularly those of us who use asynch
IO directly.
:-)
Jeff
Badrinath Venkatachari wrote:
>
> hi,
> When make_request() is called from ll_rw_block() for disk I/O, it first
> finds out if the buffer_head is uptodate. If the buffer_head is uptodate,
> then it returns...
>
> What I want to do is to make make_request() return if the buffer_head
> passed to it is NOT uptodate and have a piece of code inside ll_rw_block()
> which checks for the return without being satisfied from the cache and
> blocks for sometime before calling make_request() again but this time to
> get the data from the disk instead. To do this, is it legal if i use the
> same buffer_head that i had when I tried the first time...Are there any
> issues that i have to be careful about like the buffer_head being given to
> another process ???
>
> (Assume that i have extended the buffer_head to include information that
> would force make_request() to let it go through the second time to get
> data from the disk without simply returning as in the first instance).
>
> TIA
>
> badri
>
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