green ff904ffb64 Fix a serious deadlock with the NFS client. Given a large enough ... atomic write request, it can fill the buffer cache with the entirety of that write in order to handle retries. However, it never drops the vnode lock, or else it wouldn't be atomic, so it ends up waiting indefinitely for more buf memory that cannot be gotten as it has it all, and it waits in an uncancellable state. To fix this, hibufspace is exported and scaled to a reasonable fraction. This is used as the limit of how much of an atomic write request by the NFS client will be handled asynchronously. If the request is larger than this, it will be turned into a synchronous request which won't deadlock the system. It's possible this value is far off from what is required by some, so it shall be tunable as soon as mount_nfs(8) learns of the new field. The slowdown between an asynchronous and a synchronous write on NFS appears to be on the order of 2x-4x. General nod by: gad MFC after: 2 weeks More testing: wes PR: kern/79208		2005-06-10 23:50:41 +00:00
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bootp_subr.c	When netbooting, as soon as we've figured out which interface we booted	2005-04-26 20:45:29 +00:00
krpc_subr.c	MFp4: use the function to fix the packet header length instead of rolling	2005-03-16 08:13:08 +00:00
krpc.h
nfs_bio.c	Fix a serious deadlock with the NFS client. Given a large enough	2005-06-10 23:50:41 +00:00
nfs_diskless.c	While I'm here, list the new kenv (boot.netif.name) along with the others.	2005-04-26 20:47:59 +00:00
nfs_lock.c	For reasons unknown, the nfs locking code used a fifo to send requests to	2004-12-06 08:31:32 +00:00
nfs_lock.h	For reasons unknown, the nfs locking code used a fifo to send requests to	2004-12-06 08:31:32 +00:00
nfs_nfsiod.c	Drop Giant before calling kthread_exit().	2005-02-07 18:21:50 +00:00
nfs_node.c	- LK_NOPAUSE is a nop now.	2005-03-31 04:37:09 +00:00
nfs_socket.c	set R_MUSTRESEND flag in mark_for_reconnect so re-connected requests get	2005-05-10 14:25:14 +00:00
nfs_subs.c	- The VI_DOOMED flag now signals the end of a vnode's relationship with	2005-03-13 12:14:56 +00:00
nfs_vfsops.c	Fix a serious deadlock with the NFS client. Given a large enough	2005-06-10 23:50:41 +00:00
nfs_vnops.c	- cache_lookup() relocks the parent in the DOTDOT case for us.	2005-04-14 07:08:34 +00:00
nfs.h	Remove unused cred arg from nfs_vinvalbuf() and many bogus arguments	2005-01-24 12:31:06 +00:00
nfsargs.h	Fix a serious deadlock with the NFS client. Given a large enough	2005-06-10 23:50:41 +00:00
nfsdiskless.h	/* -> /*- for license, minor formatting changes	2005-01-07 01:45:51 +00:00
nfsm_subs.h	/* -> /*- for license, minor formatting changes	2005-01-07 01:45:51 +00:00
nfsmount.h	Fix a serious deadlock with the NFS client. Given a large enough	2005-06-10 23:50:41 +00:00
nfsnode.h	Use vfs_hash.	2005-03-16 11:28:19 +00:00
nfsstats.h	/* -> /*- for license, minor formatting changes	2005-01-07 01:45:51 +00:00
nlminfo.h