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update to match with the recent reality. PR/28793.

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This commit is contained in:
yamt 2004-12-28 18:36:45 +00:00
parent 68490c8820
commit 41fc72dca2
2 changed files with 18 additions and 19 deletions
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7
share/man/man9/namecache.9
View File

@ -1,4 +1,4 @@
.\" $NetBSD: namecache.9,v 1.8 2003/04/16 13:35:31 wiz Exp $
.\" $NetBSD: namecache.9,v 1.9 2004/12/28 18:36:45 yamt Exp $
.\"
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -95,10 +95,11 @@ struct namecache {
LIST_ENTRY(namecache) nc_hash; /* hash chain */
TAILQ_ENTRY(namecache) nc_lru; /* LRU chain */
LIST_ENTRY(namecache) nc_vhash; /* directory hash chain */
LIST_ENTRY(namecache) nc_dvlist;
struct vnode *nc_dvp; /* vnode of parent of name */
u_long nc_dvpid; /* capability number of nc_dvp */
LIST_ENTRY(namecache) nc_vlist;
struct vnode *nc_vp; /* vnode the name refers to */
u_long nc_vpid; /* capability number of nc_vp */
int nc_flags; /* copy of componentname's ISWHITEOUT */
char nc_nlen; /* length of name */
char nc_name[NCHNAMLEN]; /* segment name */
};

30
share/man/man9/vnode.9
View File

@ -1,4 +1,4 @@
.\" $NetBSD: vnode.9,v 1.22 2004/05/26 23:00:32 wiz Exp $
.\" $NetBSD: vnode.9,v 1.23 2004/12/28 18:36:45 yamt Exp $
.\"
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -157,8 +157,6 @@ struct vnode {
int v_numoutput; /* num pending writes */
long v_writecount; /* ref count of writers */
long v_holdcnt; /* page \*[Am] buffer refs */
daddr_t v_lastr; /* last read */
u_long v_id; /* capability id */
struct mount *v_mount; /* ptr to vfs we are in */
int (**v_op)(void *); /* vnode ops vector */
TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
@ -166,6 +164,8 @@ struct vnode {
struct buflists v_cleanblkhd; /* clean blocklist head */
struct buflists v_dirtyblkhd; /* dirty blocklist head */
LIST_ENTRY(vnode) v_synclist; /* dirty vnodes */
LIST_HEAD(, namecache) v_dnclist; /* namecaches for children */
LIST_HEAD(, namecache) v_nclist; /* namecaches for our parent */
union {
struct mount *vu_mountedhere;/* ptr to mounted vfs */
struct socket *vu_socket; /* unix ipc (VSOCK) */
@ -182,6 +182,10 @@ struct vnode {
struct lock v_lock; /* lock for this vnode */
struct lock *v_vnlock; /* ptr to vnode lock */
void *v_data; /* private data for fs */
struct klist v_klist; /* knotes attached to vnode */
#ifdef VERIFIED_EXEC
char fp_status; /* fingerprint status */
#endif
};
.Ed
.Pp
@ -305,18 +309,14 @@ Its value must only be modified at splbio (see
It does not track the number of dirty buffers attached to the
vnode.
.Pp
Every time a vnode is reassigned to a new file, the vnode capability
identifier
.Em v_id
is changed.
It is used to maintain the name lookup cache consistency by providing
a unique \*[Lt]vnode *,v_id\*[Gt] tuple without requiring the cache to
hold a reference.
The name lookup cache can later compare the vnode's capability identifier
to its copy and see if the vnode still points to the same file.
See
.Em v_dnclist
and
.Em v_nclist
are used by
.Xr namecache 9
for details on the name lookup cache.
to maintain the list of associated entries so that
.Xr cache_purge 9
can purge them.
.Pp
The link to the file system which owns the vnode is recorded by
.Em v_mount .
@ -341,8 +341,6 @@ When not in use, vnodes are kept on the freelist through
.Em v_freelist .
The vnodes still reference valid files but may be reused to refer to a
new file at any time.
Often, these vnodes are also held in caches in the system, such as
the name lookup cache.
When a valid vnode which is on the freelist is used again, the user
must call
.Fn vget