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Annotation of XNU/bsd/miscfs/devfs/devfsdefs.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright 1997,1998 Julian Elischer.  All rights reserved.
        !            24:  * [email protected]
        !            25:  * 
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions are
        !            28:  * met:
        !            29:  *  1. Redistributions of source code must retain the above copyright
        !            30:  *     notice, this list of conditions and the following disclaimer.
        !            31:  *  2. Redistributions in binary form must reproduce the above copyright notice,
        !            32:  *     this list of conditions and the following disclaimer in the documentation
        !            33:  *     and/or other materials provided with the distribution.
        !            34:  * 
        !            35:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
        !            36:  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            37:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            38:  * DISCLAIMED.  IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
        !            39:  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            40:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            41:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
        !            42:  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            43:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            44:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            45:  * SUCH DAMAGE.
        !            46:  * 
        !            47:  * devfsdefs.h
        !            48:  */
        !            49: 
        !            50: /*
        !            51:  * HISTORY
        !            52:  *  8-April-1999 Dieter Siegmund ([email protected])
        !            53:  *     Ported to from FreeBSD 3.1
        !            54:  *     Removed unnecessary/unused defines
        !            55:  *     Renamed structures/elements to clarify usage in code.
        !            56:  */
        !            57: 
        !            58: 
        !            59: #define DEVMAXNAMESIZE         32              /* XXX */
        !            60: #define DEVMAXPATHSIZE         128             /* XXX */
        !            61: 
        !            62: typedef enum {
        !            63:     DEV_DIR,
        !            64:     DEV_BDEV,
        !            65:     DEV_CDEV,
        !            66:     DEV_SLNK,
        !            67: } devfstype_t;
        !            68: 
        !            69: extern int (**devfs_vnodeop_p)();      /* our own vector array for dirs */
        !            70: extern int (**devfs_spec_vnodeop_p)(); /* our own vector array for devs */
        !            71: extern struct vfsops devfs_vfsops;
        !            72: 
        !            73: typedef        struct devnode          devnode_t;
        !            74: typedef struct devdirent       devdirent_t;
        !            75: typedef union devnode_type     devnode_type_t;
        !            76: 
        !            77: struct devfs_stats {
        !            78:     int                        nodes;
        !            79:     int                        entries;
        !            80:     int                        mounts;
        !            81:     int                        stringspace;
        !            82: };
        !            83: 
        !            84: union devnode_type {
        !            85:     dev_t              dev;
        !            86:     struct {
        !            87:        devdirent_t *   dirlist;
        !            88:        devdirent_t * * dirlast;
        !            89:        devnode_t *     parent;
        !            90:        devdirent_t *   myname;         /* my entry in .. */
        !            91:        int             entrycount;
        !            92:     }Dir;
        !            93:     struct {
        !            94:        char *          name;   /* must be allocated separately */
        !            95:        int             namelen;
        !            96:     }Slnk;
        !            97: };
        !            98: 
        !            99: #define        DN_ACCESS       0x0001          /* Access time update request. */
        !           100: #define        DN_CHANGE       0x0002          /* Inode change time update request. */
        !           101: #define        DN_UPDATE       0x0004          /* Modification time update request. */
        !           102: #define        DN_MODIFIED     0x0008          /* Inode has been modified. */
        !           103: #define        DN_RENAME       0x0010          /* Inode is being renamed. */
        !           104: 
        !           105: struct devnode
        !           106: {
        !           107:     devfstype_t                dn_type;
        !           108:     int                        dn_flags;
        !           109:     u_short            dn_mode;
        !           110:     u_short            dn_uid; 
        !           111:     u_short            dn_gid;
        !           112:     struct timespec    dn_atime;/* time of last access */
        !           113:     struct timespec    dn_mtime;/* time of last modification */
        !           114:     struct timespec    dn_ctime;/* time file changed */
        !           115:     int        (***dn_ops)(void *);/* yuk... pointer to pointer(s) to funcs */
        !           116:     int                        dn_links;/* how many file links does this node have? */
        !           117:     struct devfsmount *        dn_dvm; /* the mount structure for this 'plane' */
        !           118:     struct vnode *     dn_vn;  /* address of last vnode that represented us */
        !           119:     int                        dn_len;   /* of any associated info (e.g. dir data) */
        !           120:     devdirent_t *      dn_linklist;/* circular list of hardlinks to this node */
        !           121:     devdirent_t *      dn_last_lookup; /* name I was last looked up from */
        !           122:     devnode_t *                dn_nextsibling; /* the list of equivalent nodes */
        !           123:     devnode_t * *      dn_prevsiblingp;/* backpointer for the above */
        !           124:     devnode_type_t     dn_typeinfo;
        !           125:     int                        dn_delete;      /* mark for deletion */
        !           126: };
        !           127: 
        !           128: struct devdirent
        !           129: {
        !           130:     /*-----------------------directory entry fields-------------*/
        !           131:     char               de_name[DEVMAXNAMESIZE];
        !           132:     devnode_t *                de_dnp;         /* the "inode" (devnode) pointer */
        !           133:     devnode_t *                de_parent;      /* backpointer to the directory itself */
        !           134:     devdirent_t *      de_next;        /* next object in this directory */
        !           135:     devdirent_t *      *de_prevp;      /* previous pointer in directory linked list */
        !           136:     devdirent_t *      de_nextlink;    /* next hardlink to this node */
        !           137:     devdirent_t *      *de_prevlinkp;  /* previous hardlink pointer for this node */
        !           138: };
        !           139: 
        !           140: extern devdirent_t *           dev_root;
        !           141: extern struct lock__bsd__      devfs_lock;
        !           142: extern struct devfs_stats      devfs_stats;
        !           143: 
        !           144: /*
        !           145:  * Rules for front nodes:
        !           146:  * Dirs hava a strict 1:1 relationship with their OWN devnode
        !           147:  * Symlinks similarly
        !           148:  * Device Nodes ALWAYS point to the devnode that is linked
        !           149:  * to the Backing node. (with a ref count)
        !           150:  */
        !           151: 
        !           152: /*
        !           153:  * DEVFS specific per/mount information, used to link a monted fs to a
        !           154:  * particular 'plane' of front nodes.
        !           155:  */
        !           156: struct devfsmount
        !           157: {
        !           158:     struct mount *     mount;  /* vfs mount struct for this fs */
        !           159:     devdirent_t *      plane_root;/* the root of this 'plane'  */
        !           160: };
        !           161: 
        !           162: /*
        !           163:  * Prototypes for DEVFS virtual filesystem operations
        !           164:  */
        !           165: #include <sys/lock.h>
        !           166: #include <miscfs/devfs/devfs_proto.h>
        !           167: 
        !           168: //#define HIDDEN_MOUNTPOINT    1
        !           169: 
        !           170: /* misc */
        !           171: #define M_DEVFSNAME    M_DEVFS
        !           172: #define M_DEVFSNODE    M_DEVFS
        !           173: #define M_DEVFSMNT     M_DEVFS
        !           174: 
        !           175: static __inline__ void
        !           176: getnanotime(struct timespec * t_p)
        !           177: {
        !           178:     struct timeval tv;
        !           179: 
        !           180:     microtime(&tv);
        !           181:     t_p->tv_sec = tv.tv_sec;
        !           182:     t_p->tv_nsec = tv.tv_usec * 1000;
        !           183:     return;
        !           184: }
        !           185: 
        !           186: #define VTODN(vp)      ((devnode_t *)(vp)->v_data)
        !           187: extern void cache_purge(struct vnode *vp); /* vfs_cache.c */
        !           188: 
        !           189: static __inline__ int
        !           190: DEVFS_LOCK(struct proc * p)
        !           191: {
        !           192:     return (lockmgr(&devfs_lock, LK_EXCLUSIVE, NULL, p));
        !           193: }
        !           194: 
        !           195: static __inline__ int
        !           196: DEVFS_UNLOCK(struct proc * p)
        !           197: {
        !           198:     return (lockmgr(&devfs_lock, LK_RELEASE, NULL, p));
        !           199: }
        !           200: 
        !           201: static __inline__ void
        !           202: DEVFS_INCR_ENTRIES()
        !           203: {
        !           204:     devfs_stats.entries++;
        !           205: }
        !           206: 
        !           207: static __inline__ void
        !           208: DEVFS_DECR_ENTRIES()
        !           209: {
        !           210:     devfs_stats.entries--;
        !           211: }
        !           212: 
        !           213: static __inline__ void
        !           214: DEVFS_INCR_NODES()
        !           215: {
        !           216:     devfs_stats.nodes++;
        !           217: }
        !           218: 
        !           219: static __inline__ void
        !           220: DEVFS_DECR_NODES()
        !           221: {
        !           222:     devfs_stats.nodes--;
        !           223: }
        !           224: 
        !           225: static __inline__ void
        !           226: DEVFS_INCR_MOUNTS()
        !           227: {
        !           228:     devfs_stats.mounts++;
        !           229: }
        !           230: 
        !           231: static __inline__ void
        !           232: DEVFS_DECR_MOUNTS()
        !           233: {
        !           234:     devfs_stats.mounts--;
        !           235: }
        !           236: 
        !           237: static __inline__ void
        !           238: DEVFS_INCR_STRINGSPACE(int space)
        !           239: {
        !           240:     devfs_stats.stringspace += space;
        !           241: }
        !           242: 
        !           243: static __inline__ void
        !           244: DEVFS_DECR_STRINGSPACE(int space)
        !           245: {
        !           246:     devfs_stats.stringspace -= space;
        !           247:     if (devfs_stats.stringspace < 0) {
        !           248:        printf("DEVFS_DECR_STRINGSPACE: (%d - %d < 0)\n",
        !           249:               devfs_stats.stringspace + space, space);
        !           250:        devfs_stats.stringspace = 0;
        !           251:     }
        !           252: }
        !           253: 
        !           254: static __inline__ void
        !           255: dn_times(devnode_t * dnp, struct timeval t1, struct timeval t2) 
        !           256: {
        !           257:     if (dnp->dn_flags & (DN_ACCESS | DN_CHANGE | DN_UPDATE)) {
        !           258:        if (dnp->dn_flags & DN_ACCESS) {
        !           259:            dnp->dn_atime.tv_sec = t1.tv_sec;
        !           260:            dnp->dn_atime.tv_nsec = t1.tv_usec * 1000;
        !           261:        }
        !           262:        if (dnp->dn_flags & DN_UPDATE) {
        !           263:            dnp->dn_mtime.tv_sec = t2.tv_sec;
        !           264:            dnp->dn_mtime.tv_nsec = t2.tv_usec * 1000;
        !           265:        }
        !           266:        if (dnp->dn_flags & DN_CHANGE) {
        !           267:            dnp->dn_ctime.tv_sec = time.tv_sec;
        !           268:            dnp->dn_ctime.tv_nsec = time.tv_usec * 1000;
        !           269:        }
        !           270:        dnp->dn_flags &= ~(DN_ACCESS | DN_CHANGE | DN_UPDATE);
        !           271:     }
        !           272:     return;
        !           273: }
        !           274: 
        !           275: static __inline__ void
        !           276: dn_copy_times(devnode_t * target, devnode_t * source)
        !           277: {
        !           278:     target->dn_atime = source->dn_atime;
        !           279:     target->dn_mtime = source->dn_mtime;
        !           280:     target->dn_ctime = source->dn_ctime;
        !           281:     return;
        !           282: }

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