jeff 72d0a20a69 - Don't acquire the vnode interlock in drain_output(). Instead, require the ... caller to acquire it. This permits drain_output() to be done atomically with other operations as well as reducing the number of lock operations. - Assert that the proper locks are held in drain_output(). - Change getdirtybuf() to accept a mutex as an argument. This mutex is used to protect the vnode's buf list and the BKGRDWAIT flag. This lock is dropped when we successfully acquire a buffer and held on return otherwise. These semantics reduce the number of cumbersome cases in calling code. - Pass the mtx from getdirtybuf() into interlocked_sleep() and allow this mutex to be used as the interlock argument to BUF_LOCK() in the LOCKBUF case of interlocked_sleep(). - Change the return value of getdirtybuf() to be the resulting locked buffer or NULL otherwise. This is for callers who pass in a list head that requires a lock. It is necessary since the lock that protects the list head must be dropped in getdirtybuf() so that we don't have a lock order reversal with the buf queues lock in bremfree(). - Adjust all callers of getdirtybuf() to match the new semantics. - Add a comment in indir_trunc() that points at unlocked access to a buf. This may also be one of the last instances of incore() in the tree.		2003-08-31 07:29:34 +00:00
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ffs	- Don't acquire the vnode interlock in drain_output(). Instead, require the	2003-08-31 07:29:34 +00:00
ufs	Eliminate the i_devvp field from the incore UFS inodes, we can	2003-08-15 20:03:19 +00:00