K 10
svn:author
V 3
bde
K 8
svn:date
V 27
1998-06-21T21:06:04.000000Z
K 7
svn:log
V 707
Fixed (?) races in mark_buffer_dirty().  We abuse the buffer cache
by hacking on locked buffers without getblk()ing them, and we didn't
even use splbio() to prevent biodone() changing the buffer underneath
use when a write completes.  I think there was no problem in practice
on i386's because the operations on b_flags and numdirtybufs happen to
be atomic.  We still depend on biodone()'s operations on b_flags not
interfering with ours.  I think there is only interference for B_ERROR,
and this is harmless because errors for async writes are ignored anyway.

Don't use mark_buffer_dirty() except for superblock-related metadata.
It was used in just one case where ordinary BSD buffering is more
natural.

END