Konstantin Belousov 11c68fb23f Busy ufs filesystem around block of code that does ".." lookup. Since ... mnt_lock is before lock of any vnode on the mp, it uses LK_NOWAIT. Since MNTK_UNMOUNT may be transient, pdp lock is dropped when vfs_busy() failed, and operation is retried after some time. This way, ffs_vget() is not called on the mp that may be in the process of being destroyed by unmount. Check for the VI_DOOMED flag on pdp after its lock is reacquired, to better detect some situations where directory containing ".." entry is removed during the lookup. Reviewed by: tegge, attilio (previous version) Tested by: pho MFC after: 1 month		2008-11-22 13:11:11 +00:00
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ffs	For now on every 10 cyclinder groups flush the buffer cache to free	2008-11-13 17:40:21 +00:00
ufs	Busy ufs filesystem around block of code that does ".." lookup. Since	2008-11-22 13:11:11 +00:00