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Introduce struct xvnode, which will be used instead of struct vnode for

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sysctl purposes.  Also add two fields to struct vnode, v_cachedfs and
v_cachedid, which hold the vnode's device and file id and are filled in
by vn_open_cred() and vn_stat().

Sponsored by:	DARPA, NAI Labs
This commit is contained in:
Dag-Erling Smørgrav 2002-07-31 12:19:49 +00:00
parent 84baf7a20f
commit 4eee8de77c
2 changed files with 39 additions and 0 deletions
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7
sys/kern/vfs_vnops.c
View File

@ -209,6 +209,10 @@ vn_open_cred(ndp, flagp, cmode, cred)
goto bad;
}
}
if ((error = VOP_GETATTR(vp, vap, cred, td)) == 0) {
vp->v_cachedfs = vap->va_fsid;
vp->v_cachedid = vap->va_fileid;
}
if ((error = VOP_OPEN(vp, fmode, cred, td)) != 0)
goto bad;
/*
@ -567,6 +571,9 @@ vn_stat(vp, sb, td)
if (error)
return (error);
vp->v_cachedfs = vap->va_fsid;
vp->v_cachedid = vap->va_fileid;
/*
* Zero the spare stat fields
*/

32
sys/sys/vnode.h
View File

@ -146,6 +146,8 @@ struct vnode {
const char *filename; /* Source file doing locking */
int line; /* Line number doing locking */
#endif
udev_t v_cachedfs; /* cached fs id */
ino_t v_cachedid; /* cached file id */
};
#define v_mountedhere v_un.vu_mountedhere
#define v_socket v_un.vu_socket
@ -153,6 +155,36 @@ struct vnode {
#define v_specnext v_un.vu_spec.vu_specnext
#define v_fifoinfo v_un.vu_fifoinfo
/*
* Userland version of struct vnode, for sysctl.
*/
struct xvnode {
size_t xv_size; /* sizeof(struct xvnode) */
void *xv_vnode; /* address of real vnode */
u_long xv_flag; /* vnode flags */
int xv_usecount; /* reference count of users */
int xv_writecount; /* reference count of writers */
int xv_holdcnt; /* page & buffer references */
u_long xv_id; /* capability identifier */
void *xv_mount; /* address of parent mount */
long xv_numoutput; /* num of writes in progress */
enum vtype xv_type; /* vnode type */
union {
void *xvu_socket; /* socket, if VSOCK */
void *xvu_fifo; /* fifo, if VFIFO */
udev_t xvu_rdev; /* maj/min, if VBLK/VCHR */
struct {
udev_t xvu_dev; /* device, if VDIR/VREG/VLNK */
ino_t xvu_ino; /* id, if VDIR/VREG/VLNK */
};
} xv_un;
};
#define xv_socket xv_un.xvu_socket
#define xv_fifo xv_un.xvu_fifo
#define xv_rdev xv_un.xvu_rdev
#define xv_dev xv_un.xvu_dev
#define xv_ino xv_un.xvu_ino
#define VN_POLLEVENT(vp, events) \
do { \
if ((vp)->v_pollinfo != NULL && \