Weird IDE block devices problem
Benjamin Herrenschmidt
bh40 at calva.net
Mon Dec 13 20:28:05 EST 1999
Hi !
Samuel Rydth (the author of Mac-On-Linux) sent me the following message.
This sound weird since it looks like order is not enforced by the IDE
block driver. Is this normal or is this a kernel bug ? I beleive it
happened with 2.2.10-2.2.13 kernels (I have to confirm this).
On Sun, Dec 12, 1999, Samuel Rydh <samuel at ibrium.se> wrote:
---------------- Begin Forwarded Message ----------------
Btw. I found an oddity with the IDE block device interface
(causes problems with DropStuffit in MacOS 9). In a sequence like
write A to sector N
write B to sector N
read sector N
then the read might not return the information "B" (but something
else). I've always assumed that the block device drivers were
supposed to enforce this consistency but I might be wrong. Everything
work as it should if an extra "fsync" is inserted after each
write. This might impact driver performance though.
----------------- End Forwarded Message -----------------
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