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Group the fields in struct vnode by their function and stick comments

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there to tell what the function is.
This commit is contained in:
Poul-Henning Kamp 2005-02-22 18:49:03 +00:00
parent 0454a53d65
commit bd8bb8e41b
1 changed files with 59 additions and 26 deletions
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85
sys/sys/vnode.h
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@ -106,49 +106,82 @@ struct vpollinfo {
#if defined(_KERNEL) || defined(_KVM_VNODE)
struct vnode {
struct mtx v_interlock; /* lock for "i" things */
u_long v_iflag; /* i vnode flags (see below) */
int v_usecount; /* i ref count of users */
struct thread *v_vxthread; /* i thread owning VXLOCK */
int v_holdcnt; /* i page & buffer references */
struct bufobj v_bufobj; /* * Buffer cache object */
u_long v_vflag; /* v vnode flags */
int v_writecount; /* v ref count of writers */
daddr_t v_lastw; /* v last write (write cluster) */
daddr_t v_cstart; /* v start block of cluster */
daddr_t v_lasta; /* v last allocation (cluster) */
int v_clen; /* v length of current cluster */
union {
struct mount *vu_mountedhere;/* v ptr to mounted vfs (VDIR) */
struct socket *vu_socket; /* v unix ipc (VSOCK) */
struct cdev *vu_cdev; /* v device (VCHR, VBLK) */
struct fifoinfo *vu_fifoinfo; /* v fifo (VFIFO) */
} v_un;
TAILQ_ENTRY(vnode) v_freelist; /* f vnode freelist */
TAILQ_ENTRY(vnode) v_nmntvnodes; /* m vnodes for mount point */
/*
* Fields which define the identity of the vnode. These fields are
* owned by the filesystem (XXX: and vgone() ?)
*/
enum vtype v_type; /* u vnode type */
const char *v_tag; /* u type of underlying data */
void *v_data; /* u private data for fs */
struct lock v_lock; /* u used if fs don't have one */
struct lock *v_vnlock; /* u pointer to vnode lock */
struct vop_vector *v_op; /* u vnode operations vector */
void *v_data; /* u private data for fs */
/*
* Filesystem instance stuff
*/
struct mount *v_mount; /* u ptr to vfs we are in */
TAILQ_ENTRY(vnode) v_nmntvnodes; /* m vnodes for mount point */
/*
* Type specific fields, only one applies to any given vnode.
* See #defines below for renaming to v_* namespace.
*/
union {
struct mount *vu_mount; /* v ptr to mountpoint (VDIR) */
struct socket *vu_socket; /* v unix domain net (VSOCK) */
struct cdev *vu_cdev; /* v device (VCHR, VBLK) */
struct fifoinfo *vu_fifoinfo; /* v fifo (VFIFO) */
} v_un;
/*
* VFS_namecache stuff
*/
LIST_HEAD(, namecache) v_cache_src; /* c Cache entries from us */
TAILQ_HEAD(, namecache) v_cache_dst; /* c Cache entries to us */
u_long v_id; /* c capability identifier */
struct vnode *v_dd; /* c .. vnode */
u_long v_ddid; /* c .. capability identifier */
struct vpollinfo *v_pollinfo; /* G Poll events, p for *v_pi */
struct label *v_label; /* MAC label for vnode */
/*
* clustering stuff
*/
daddr_t v_cstart; /* v start block of cluster */
daddr_t v_lasta; /* v last allocation */
daddr_t v_lastw; /* v last write */
int v_clen; /* v length of cur. cluster */
/*
* Locking
*/
struct lock v_lock; /* u (if fs don't have one) */
struct mtx v_interlock; /* lock for "i" things */
struct lock *v_vnlock; /* u pointer to vnode lock */
#ifdef DEBUG_LOCKS
const char *filename; /* Source file doing locking */
int line; /* Line number doing locking */
#endif
int v_holdcnt; /* i page & buffer references */
int v_usecount; /* i ref count of users */
struct thread *v_vxthread; /* i thread owning VXLOCK */
u_long v_iflag; /* i vnode flags (see below) */
u_long v_vflag; /* v vnode flags */
int v_writecount; /* v ref count of writers */
/*
* The machinery of being a vnode
*/
TAILQ_ENTRY(vnode) v_freelist; /* f vnode freelist */
struct bufobj v_bufobj; /* * Buffer cache object */
/*
* Hooks for various subsystems and features.
*/
struct vpollinfo *v_pollinfo; /* G Poll events, p for *v_pi */
struct label *v_label; /* MAC label for vnode */
};
#endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
#define v_mountedhere v_un.vu_mountedhere
#define v_mountedhere v_un.vu_mount
#define v_socket v_un.vu_socket
#define v_rdev v_un.vu_cdev
#define v_fifoinfo v_un.vu_fifoinfo