Don Lewis 3a140162b4 Fix up locking problems in fifo_open() and fifo_close(): ... Sleep on the vnode interlock while waiting for another caller to increment fi_readers or fi_writers. Hold the vnode interlock while incrementing fi_readers or fi_writers to prevent a wakeup from being missed. Only access fi_readers and fi_writers while holding the vnode lock. Previously fifo_close() decremented their values without holding a lock. Move resource deallocation from fifo_close() to fifo_inactive(), which allows the VOP_CLOSE() call in the error return path in fifo_open() to be removed. Fifo_open() was calling VOP_CLOSE() with the vnode lock held, in violation the current vnode locking API. Also the way fifo_close() used vrefcnt() to decide whether to deallocate resources was bogus according to comments in the vrefcnt() implementation. Reviewed by: bde		2003-06-01 06:24:32 +00:00
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fifo.h	Remove __P.	2002-03-19 22:20:14 +00:00
fifo_vnops.c	Fix up locking problems in fifo_open() and fifo_close():	2003-06-01 06:24:32 +00:00