3e425b968d
This code will be turned on with the TWO options DEVFS and SLICE. (see LINT) Two labels PRE_DEVFS_SLICE and POST_DEVFS_SLICE will deliniate these changes. /dev will be automatically mounted by init (thanks phk) on bootup. See /sys/dev/slice/slice.4 for more info. All code should act the same without these options enabled. Mike Smith, Poul Henning Kamp, Soeren, and a few dozen others This code does not support the following: bad144 handling. Persistance. (My head is still hurting from the last time we discussed this) ATAPI flopies are not handled by the SLICE code yet. When this code is running, all major numbers are arbitrary and COULD be dynamically assigned. (this is not done, for POLA only) Minor numbers for disk slices ARE arbitray and dynamically assigned.
209 lines
6.3 KiB
C
209 lines
6.3 KiB
C
/*
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* Copyright 1997,1998 Julian Elischer. All rights reserved.
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* julian@freebsd.org
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: devfsdefs.h,v 1.13 1998/01/02 07:31:07 julian Exp $
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*/
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#ifdef DEVFS_DEBUG
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#define DBPRINT(A) printf(A)
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#else
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#define DBPRINT(A)
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#endif
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/* first a couple of defines for compatibility with inodes */
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#define ISUID 04000 /* set user identifier when exec'ing */
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#define ISGID 02000 /* set group identifier when exec'ing */
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#define ISVTX 01000 /* save execution information on exit */
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#define IREAD 0400 /* read permission */
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#define IWRITE 0200 /* write permission */
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#define IEXEC 0100 /* execute permission */
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#define ILOCKED 0x0001 /* inode is locked */
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#define IWANT 0x0002 /* some process waiting on lock */
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#define IRENAME 0x0004 /* inode is being renamed */
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#define IUPD 0x0010 /* file has been modified */
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#define IACC 0x0020 /* inode access time to be updated */
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#define ICHG 0x0040 /* inode has been changed */
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#define IMOD 0x0080 /* inode has been modified */
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#define ISHLOCK 0x0100 /* file has shared lock */
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#define IEXLOCK 0x0200 /* file has exclusive lock */
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#define ILWAIT 0x0400 /* someone waiting on file lock */
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/*
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* Lock and unlock inodes.
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*/
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#ifdef notdef
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#define DNLOCK(ip) { \
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while ((ip)->i_flag & ILOCKED) { \
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(ip)->i_flag |= IWANT; \
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(void) sleep((caddr_t)(ip), PINOD); \
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} \
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(ip)->i_flag |= ILOCKED; \
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}
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#define DNUNLOCK(ip) { \
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(ip)->i_flag &= ~ILOCKED; \
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if ((ip)->i_flag&IWANT) { \
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(ip)->i_flag &= ~IWANT; \
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wakeup((caddr_t)(ip)); \
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} \
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}
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#else
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#define DNLOCK(ip)
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#define DNUNLOCK(ip)
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#endif
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#define DEVMAXNAMESIZE 32
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#define DEVMAXPATHSIZE 128
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#define DEV_DIR 1
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#define DEV_BDEV 2
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#define DEV_CDEV 3
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#define DEV_DDEV 4
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#define DEV_ALIAS 5
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#define DEV_SLNK 6
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#define DEV_PIPE 7
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extern vop_t **devfs_vnodeop_p; /* our own vector array for dirs */
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extern vop_t **dev_spec_vnodeop_p; /* our own vector array for devs */
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typedef struct dev_name *devnm_p;
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typedef struct devnode *dn_p;
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struct devnode /* the equivalent of an INODE */
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{
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u_short type;
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int flags; /* more inode compatible for now *//*XXXkill*/
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u_short mode; /* basically inode compatible (drwxrwxrwx) */
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u_short uid; /* basically inode compatible */
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u_short gid; /* basically inode compatible */
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struct timespec atime; /* time of last access */
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struct timespec mtime; /* time of last modification */
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struct timespec ctime; /* time file changed */
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int links; /* how many file links does this node have? */
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struct devfsmount *dvm; /* the mount structure for this 'plane' */
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struct vnode *vn; /* address of last vnode that represented us */
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u_long vn_id; /* make sure we have the right vnode */
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int (***ops)(void *); /* yuk... pointer to pointer(s) to funcs */
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int len; /* of any associated info (e.g. dir data) */
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devnm_p linklist; /* circular list of hardlinks to this node */
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devnm_p last_lookup; /* name I was last looked up from */
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dn_p nextsibling; /* the list of equivelent nodes */
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dn_p *prevsiblingp; /* backpointer for the above */
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union typeinfo {
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struct {
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struct cdevsw *cdevsw;
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dev_t dev;
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}Cdev;
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struct {
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struct bdevsw *bdevsw;
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dev_t dev;
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}Bdev;
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struct {
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int (***ops)(void *); /* duplicate, used in dev_add_node */
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int arg;
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}Ddev;
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struct {
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devnm_p dirlist;
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devnm_p *dirlast;
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dn_p parent;
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devnm_p myname; /* my entry in .. */
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int entrycount;
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}Dir;
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struct {
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char *name; /* must be allocated separately */
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int namelen;
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}Slnk;
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struct {
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devnm_p realthing;
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devnm_p next;
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}Alias;
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struct {
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struct socket *sock;
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}Pipe;
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}by;
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};
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typedef struct devnode devnode_t;
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struct dev_name
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{
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/*-----------------------directory entry fields-------------*/
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char name[DEVMAXNAMESIZE];
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dn_p dnp; /* the "inode" (devnode) pointer */
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dn_p parent; /* backpointer to the directory itself */
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devnm_p next; /* next object in this directory */
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devnm_p *prevp; /* previous pointer in directory linked list */
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devnm_p nextlink; /* next hardlink to this node */
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devnm_p *prevlinkp; /* previous hardlink pointer for this node */
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/*-----------------------aliases or backing nodes----------*/
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union {
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struct {
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devnm_p aliases; /* aliase chain (kill with us)*/
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} back;
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struct {
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devnm_p realthing; /* ptr to the backing node */
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} front;
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} as;
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};
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typedef struct dev_name devnm_t;
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extern int devfs_up_and_going;
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extern devnm_p dev_root;
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/*
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* Rules for front nodes:
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* Dirs hava a strict 1:1 relationship with their OWN devnode
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* Symlinks similarly
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* Device Nodes ALWAYS point to the devnode that is linked
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* to the Backing node. (with a ref count)
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*/
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/*
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* DEVFS specific per/mount information, used to link a monted fs to a
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* particular 'plane' of front nodes.
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*/
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struct devfsmount
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{
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struct mount *mount; /* vfs mount struct for this fs */
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devnm_p plane_root; /* the root of this 'plane' */
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int flags; /* usefule some day 8-) */
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};
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struct dev_vn_data
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{
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char magic[6]; /* = "devfs" if correct */
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devnm_p front;
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devnm_p back;
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};
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extern struct vnodeops spec_vnodeops,devfs_vnodeops;
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/*
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* Prototypes for DEVFS virtual filesystem operations
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*/
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#include <miscfs/devfs/devfs_proto.h>
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