Konstantin Belousov c480f781ea Current implementations of sync(2) and syncer vnode fsync() VOP uses ... mnt_noasync counter to temporary remove MNTK_ASYNC mount option, which is needed to guarantee a synchronous completion of the initiated i/o before syscall or VOP return. Global removal of MNTK_ASYNC option is harmful because not only i/o started from corresponding thread becomes synchronous, but all i/o is synchronous on the filesystem which is initiated during sync(2) or syncer activity. Instead of removing MNTK_ASYNC from mnt_kern_flag, provide a local thread flag to disable async i/o for current thread only. Use the opportunity to move DOINGASYNC() macro into sys/vnode.h and consistently use it through places which tested for MNTK_ASYNC. Some testing demonstrated 60-70% improvements in run time for the metadata-intensive operations on async-mounted UFS volumes, but still with great deviation due to other reasons. Reviewed by: mckusick Tested by: scottl MFC after: 2 weeks		2012-02-06 11:04:36 +00:00
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nfs_bio.c	A problem with respect to data read through the buffer cache for both	2012-01-27 02:46:12 +00:00
nfs_kdtrace.c	Fix the module dependency in nfs_kdtrace.c for the old NFS	2011-05-06 19:55:15 +00:00
nfs_krpc.c	jwd@ reported a problem via email where the old NFS client would	2011-12-21 02:45:51 +00:00
nfs_nfsiod.c	Change the sysctl naming for the old and new NFS clients	2011-05-15 20:52:43 +00:00
nfs_node.c	Fix a LOR in the NFS client which could cause a deadlock.	2011-08-02 11:24:42 +00:00
nfs_subs.c	Close a race in NFS lookup processing that could result in stale name cache	2012-01-20 20:02:01 +00:00
nfs_vfsops.c	When a "mount -u" switches an NFS mount point from TCP to UDP,	2012-01-31 03:58:26 +00:00
nfs_vnops.c	Current implementations of sync(2) and syncer vnode fsync() VOP uses	2012-02-06 11:04:36 +00:00
nfs.h	Fix a comment that got missed by r221973 which changed	2011-05-16 13:12:09 +00:00
nfsargs.h	Implemented a mount option "nocto" that disables cache coherency	2011-05-04 13:27:45 +00:00
nfsm_subs.h	Close a race in NFS lookup processing that could result in stale name cache	2012-01-20 20:02:01 +00:00
nfsmount.h	Add a timeout on positive name cache entries in the NFS client. That is,	2012-01-25 20:05:58 +00:00
nfsnode.h	Close a race in NFS lookup processing that could result in stale name cache	2012-01-20 20:02:01 +00:00
nfsstats.h
nlminfo.h