Date: Sun, 21 Jan 1996 06:19:43 +1100 From: Bruce Evans <bde@zeta.org.au> To: gibbs@freefall.freebsd.org, mpp@mpp.minn.net Cc: freebsd-hackers@FreeBSD.org, freebsd-scsi@freefall.freebsd.org Subject: Re: Can't take dumps w/Adaptec 2842 Message-ID: <199601201919.GAA03759@godzilla.zeta.org.au>
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>tell you not to sleep. Now the problem is that sddump wants you
>to poll since interrupts may well be disabled. I have no problem
^^^^^^^^^^^ are always
>putting polling back in for this one case so long as its differentiated
>from the other times that SCSI_NOSLEEP is used. Perhaps we need
>a new flag? I'd like SCSI_NOSLEEP to mean "calling tsleep may not
>be safe" and perhaps SCSI_POLL (only used during sddump) would
>cause drivers to disable there interrupt (just in case) and poll
>until complete.
I'd like a common polled mode i/o interface to all drivers. Something
like
int (*polled_write)(void *buf, off_t off, size_t nbytes);
This could be used to write a single dump routine. (Currently, sddump()
is a clone of an old, not so good version of wddump().) For dumping,
it might be convenient to only implement the case where `buf' is page
aligned, and `off' and `nbytes' are multiples of DEV_BSIZE then (they
could be passed as daddr_t's).
Bruce
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