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author | ps <ps@FreeBSD.org> | 2004-12-15 22:20:22 +0000 |
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committer | ps <ps@FreeBSD.org> | 2004-12-15 22:20:22 +0000 |
commit | 7c0944d56c2504d71b846fe79d625028c80cdfd8 (patch) | |
tree | c7f222f7a8c32bdc81d83fd0f9f6321889902c8b /sys/nfsclient/nfsnode.h | |
parent | ede2fb9751ccd8ce53c764a80e9c92cf19817e80 (diff) | |
download | FreeBSD-src-7c0944d56c2504d71b846fe79d625028c80cdfd8.zip FreeBSD-src-7c0944d56c2504d71b846fe79d625028c80cdfd8.tar.gz |
First cut of NFS direct IO support.
- NFS direct IO completely bypasses the buffer and page caches.
If a file is open for direct IO all caching is disabled.
- Direct IO for Directories will be addressed later.
- 2 new NFS directio related sysctls are added. One is a knob to
disable NFS direct IO completely (direct IO is enabled by default).
The other is to disallow mmaped IO on a file that has at least one
O_DIRECT open (see the comment in nfs_vnops.c for more details).
The default is to allow mmaps on a file that has O_DIRECT opens.
Submitted by: Mohan Srinivasan mohans at yahoo-inc dot com
Obtained from: Yahoo!
Diffstat (limited to 'sys/nfsclient/nfsnode.h')
-rw-r--r-- | sys/nfsclient/nfsnode.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/nfsclient/nfsnode.h b/sys/nfsclient/nfsnode.h index 9889ea4..4c03183 100644 --- a/sys/nfsclient/nfsnode.h +++ b/sys/nfsclient/nfsnode.h @@ -127,6 +127,7 @@ struct nfsnode { u_char *n_name; /* leaf name, for v4 OPEN op */ uint32_t n_namelen; daddr_t ra_expect_lbn; + int n_directio_opens; }; #define n_atim n_un1.nf_atim @@ -149,6 +150,7 @@ struct nfsnode { #define NCREATED 0x0800 /* Opened by nfs_create() */ #define NTRUNCATE 0x1000 /* Opened by nfs_setattr() */ #define NSIZECHANGED 0x2000 /* File size has changed: need cache inval */ +#define NNONCACHE 0x4000 /* Node marked as noncacheable */ /* * Convert between nfsnode pointers and vnode pointers |