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#ifdef DEVFS_DEBUG
#define DBPRINT(A) printf(A)
#else
#define DBPRINT(A)
#endif
/*
* Written by Julian Elischer (julian@DIALIX.oz.au)
*
* $Header: /home/ncvs/src/sys/miscfs/devfs/devfsdefs.h,v 1.7 1995/10/04 11:05:09 julian Exp $
*/
/* first a couple of defines for compatibility with inodes */
#define M_DEVFSNAME M_DEVFSBACK
#define ISUID 04000 /* set user identifier when exec'ing */
#define ISGID 02000 /* set group identifier when exec'ing */
#define ISVTX 01000 /* save execution information on exit */
#define IREAD 0400 /* read permission */
#define IWRITE 0200 /* write permission */
#define IEXEC 0100 /* execute permission */
#define ILOCKED 0x0001 /* inode is locked */
#define IWANT 0x0002 /* some process waiting on lock */
#define IRENAME 0x0004 /* inode is being renamed */
#define IUPD 0x0010 /* file has been modified */
#define IACC 0x0020 /* inode access time to be updated */
#define ICHG 0x0040 /* inode has been changed */
#define IMOD 0x0080 /* inode has been modified */
#define ISHLOCK 0x0100 /* file has shared lock */
#define IEXLOCK 0x0200 /* file has exclusive lock */
#define ILWAIT 0x0400 /* someone waiting on file lock */
/*
* Lock and unlock inodes.
*/
#ifdef notdef
#define DNLOCK(ip) { \
while ((ip)->i_flag & ILOCKED) { \
(ip)->i_flag |= IWANT; \
(void) sleep((caddr_t)(ip), PINOD); \
} \
(ip)->i_flag |= ILOCKED; \
}
#define DNUNLOCK(ip) { \
(ip)->i_flag &= ~ILOCKED; \
if ((ip)->i_flag&IWANT) { \
(ip)->i_flag &= ~IWANT; \
wakeup((caddr_t)(ip)); \
} \
}
#else
#define DNLOCK(ip)
#define DNUNLOCK(ip)
#endif
#define DEVMAXNAMESIZE 32
#define DEVMAXPATHSIZE 128
#define DEV_DIR 1
#define DEV_BDEV 2
#define DEV_CDEV 3
#define DEV_DDEV 4
#define DEV_ALIAS 5
#define DEV_SLNK 6
extern vop_t **devfs_vnodeop_p; /* our own vector array for dirs */
extern vop_t **dev_spec_vnodeop_p; /* our own vector array for devs */
typedef struct dev_name *devnm_p;
typedef struct devnode *dn_p;
struct devnode /* the equivalent of an INODE */
{
u_short type;
int flags; /* more inode compatible for now *//*XXXkill*/
u_short mode; /* basically inode compatible (drwxrwxrwx) */
u_short uid; /* basically inode compatible */
u_short gid; /* basically inode compatible */
struct timespec atime; /* time of last access */
struct timespec mtime; /* time of last modification */
struct timespec ctime; /* time file changed */
int links; /* how many file links does this node have? */
struct devfsmount *dvm; /* the mount structure for this 'plane' */
struct vnode *vn; /* address of last vnode that represented us */
u_long vn_id; /* make sure we have the right vnode */
int (***ops)(void *); /* yuk... pointer to pointer(s) to funcs */
int len; /* of any associated info (e.g. dir data) */
devnm_p last_lookup; /* name I was last looked up from */
union typeinfo {
struct {
struct cdevsw *cdevsw;
dev_t dev;
}Cdev;
struct {
struct bdevsw *bdevsw;
dev_t dev;
}Bdev;
struct {
int (***ops)(void *); /* duplicate, used in dev_add_node */
int arg;
}Ddev;
struct {
devnm_p dirlist;
devnm_p *dirlast;
dn_p parent;
devnm_p myname; /* my entry in .. */
int entrycount;
}Dir;
struct {
char *name; /* must be allocated separatly */
int namelen;
}Slnk;
struct {
devnm_p realthing;
devnm_p next;
}Alias;
}by;
};
typedef struct devnode devnode_t;
struct dev_name
{
/*-----------------------directory entry fields-------------*/
char name[DEVMAXNAMESIZE];
dn_p dnp; /* the "inode" (devnode) pointer */
dn_p parent; /* backpointer to the directory itself */
devnm_p next; /* next object in this directory */
devnm_p *prevp; /* previous pointer in directory linked list */
/*-----------------------aliases or backing nodes----------*/
union {
struct {
devnm_p aliases; /* aliase chain (kill with us)*/
} back;
struct {
devnm_p realthing; /* ptr to the backing node */
} front;
} as;
/*-----------------------the front-back chain-------------*/
devnm_p next_front; /* the linked list of all our front nodes */
devnm_p *prev_frontp; /* the end of the front node chain */
};
typedef struct dev_name devnm_t;
extern int devfs_up_and_going;
extern devnm_p dev_root;
/*
* Rules for front nodes:
* Dirs hava a strict 1:1 relationship with their OWN devnode
* Symlinks similarly
* Device Nodes ALWAYS point to the devnode that is linked
* to the Backing node. (with a ref count)
*/
/*
* DEVFS specific per/mount information, used to link a monted fs to a
* particular 'plane' of front nodes.
*/
struct devfsmount
{
struct mount *mount; /* vfs mount struct for this fs */
devnm_p plane_root; /* the root of this 'plane' */
int flags; /* usefule some day 8-) */
};
struct dev_vn_data
{
char magic[6]; /* = "devfs" if correct */
devnm_p front;
devnm_p back;
};
extern struct vnodeops spec_vnodeops,devfs_vnodeops;
/*
* Prototypes for DEVFS virtual filesystem operations
*/
#include "devfs_proto.h"
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