Bruce Evans add4ae9324 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.		1998-06-21 21:06:04 +00:00
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ext2fs	Fixed (?) races in mark_buffer_dirty(). We abuse the buffer cache	1998-06-21 21:06:04 +00:00