/*#define SPLIT_DEVS 1*/ /* * Copyright 1997,1998 Julian Elischer. All rights reserved. * julian@freebsd.org * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $Id: devfs_tree.c,v 1.50 1998/03/26 20:52:05 phk Exp $ */ #include "opt_devfs.h" #include #include #include #include #include #include #include #include #include #include #include #include static MALLOC_DEFINE(M_DEVFSNODE, "DEVFS node", "DEVFS node"); static MALLOC_DEFINE(M_DEVFSNAME, "DEVFS name", "DEVFS name"); devnm_p dev_root; /* root of the backing tree */ struct mount *devfs_hidden_mount; int devfs_up_and_going; /* * Set up the root directory node in the backing plane * This is happenning before the vfs system has been * set up yet, so be careful about what we reference.. * Notice that the ops are by indirection.. as they haven't * been set up yet! * DEVFS has a hidden mountpoint that is used as the anchor point * for the internal 'blueprint' version of the dev filesystem tree. */ /*proto*/ void devfs_sinit(void *junk) { int retval; /* we will discard this */ /* * call the right routine at the right time with the right args.... */ retval = dev_add_entry("root", NULL, DEV_DIR, NULL, NULL, NULL, &dev_root); #ifdef PARANOID if(retval) panic("devfs_sinit: dev_add_entry failed "); #endif devfs_hidden_mount = (struct mount *)malloc(sizeof(struct mount), M_MOUNT,M_NOWAIT); #ifdef PARANOID if(!devfs_hidden_mount) panic("devfs_sinit: malloc failed"); #endif bzero(devfs_hidden_mount,sizeof(struct mount)); devfs_mount(devfs_hidden_mount,"dummy",NULL,NULL,NULL); dev_root->dnp->dvm = (struct devfsmount *)devfs_hidden_mount->mnt_data; devfs_up_and_going = 1; printf("DEVFS: ready for devices\n"); /* part 2 of this is done later */ } SYSINIT(devfs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_sinit, NULL) /***********************************************************************\ ************************************************************************* * Routines used to find our way to a point in the tree * ************************************************************************* \***********************************************************************/ /***************************************************************\ * Search down the linked list off a dir to find "name" * * return the dn_p for that node. \***************************************************************/ /*proto*/ devnm_p dev_findname(dn_p dir,char *name) { devnm_p newfp; DBPRINT((" dev_findname(%s)\n",name)); if(dir->type != DEV_DIR) return 0;/*XXX*/ /* printf?*/ if(name[0] == '.') { if(name[1] == 0) { return dir->by.Dir.myname; } if((name[1] == '.') && (name[2] == 0)) { /* for root, .. == . */ return dir->by.Dir.parent->by.Dir.myname; } } newfp = dir->by.Dir.dirlist; while(newfp) { if(!(strcmp(name,newfp->name))) return newfp; newfp = newfp->next; } return NULL; } /***********************************************************************\ * Given a starting node (0 for root) and a pathname, return the node * * for the end item on the path. It MUST BE A DIRECTORY. If the 'CREATE' * * option is true, then create any missing nodes in the path and create * * and return the final node as well. * * This is used to set up a directory, before making nodes in it.. * * * * Warning: This function is RECURSIVE. * * char *orig_path, find this dir (err if not dir) * * dn_p dirnode, starting point (0 = root) * * int create, create path if not found * * dn_p *dn_pp) where to return the node of the dir * \***********************************************************************/ /*proto*/ int dev_finddir(char *orig_path, dn_p dirnode, int create, dn_p *dn_pp) { devnm_p devnmp; dn_p dnp; char pathbuf[DEVMAXPATHSIZE]; char *path; char *name; register char *cp; int retval; DBPRINT(("dev_finddir\n")); /***************************************\ * If no parent directory is given * * then start at the root of the tree * \***************************************/ if(!dirnode) dirnode = dev_root->dnp; /***************************************\ * Sanity Checks * \***************************************/ if(dirnode->type != DEV_DIR) return ENOTDIR; if(strlen(orig_path) > (DEVMAXPATHSIZE - 1)) return ENAMETOOLONG; path = pathbuf; strcpy(path,orig_path); /***************************************\ * always absolute, skip leading / * * get rid of / or // or /// etc. * \***************************************/ while(*path == '/') path++; /***************************************\ * If nothing left, then parent was it.. * \***************************************/ if ( *path == '\0' ) { *dn_pp = dirnode; return 0; } /***************************************\ * find the next segment of the name * \***************************************/ cp = name = path; while((*cp != '/') && (*cp != 0)) { cp++; } /***********************************************\ * Check to see if it's the last component * \***********************************************/ if(*cp) { path = cp + 1; /* path refers to the rest */ *cp = 0; /* name is now a separate string */ if(!(*path)) { path = (char *)0; /* was trailing slash */ } } else { path = NULL; /* no more to do */ } /***************************************\ * Start scanning along the linked list * \***************************************/ devnmp = dev_findname(dirnode,name); if(devnmp) { /* check it's a directory */ dnp = devnmp->dnp; if(dnp->type != DEV_DIR) return ENOTDIR; } else { /***************************************\ * The required element does not exist * * So we will add it if asked to. * \***************************************/ if(!create) return ENOENT; if(retval = dev_add_entry(name, dirnode, DEV_DIR, NULL, NULL, NULL, &devnmp)) { return retval; } dnp = devnmp->dnp; devfs_propogate(dirnode->by.Dir.myname,devnmp); } if(path != NULL) { /* decide whether to recurse more or return */ return (dev_finddir(path,dnp,create,dn_pp)); } else { *dn_pp = dnp; return 0; } } /***********************************************************************\ * Add a new NAME element to the devfs * * If we're creating a root node, then dirname is NULL * * Basically this creates a new namespace entry for the device node * * * * Creates a name node, and links it to the supplied node * \***********************************************************************/ /*proto*/ int dev_add_name(char *name, dn_p dirnode, devnm_p back, dn_p dnp, devnm_p *devnm_pp) { devnm_p devnmp; DBPRINT(("dev_add_name\n")); if(dirnode != NULL ) { if(dirnode->type != DEV_DIR) return(ENOTDIR); if( dev_findname(dirnode,name)) return(EEXIST); } /* * make sure the name is legal * slightly misleading in the case of NULL */ if( !name || (strlen(name) > (DEVMAXNAMESIZE - 1))) return (ENAMETOOLONG); /* * Allocate and fill out a new directory entry */ if(!(devnmp = (devnm_p)malloc(sizeof(devnm_t), M_DEVFSNAME, M_NOWAIT))) { return ENOMEM; } bzero(devnmp,sizeof(devnm_t)); /* inherrit our parent's mount info */ /*XXX*/ /* a kludge but.... */ if(dirnode && ( dnp->dvm == NULL)) { dnp->dvm = dirnode->dvm; if(!dnp->dvm) printf("parent had null dvm "); } /* * Link the two together * include the implicit link in the count of links to the devnode.. * this stops it from being accidentally freed later. */ devnmp->dnp = dnp; dnp->links++ ; /* implicit from our own name-node */ /* * Make sure that we can find all the links that reference a node * so that we can get them all if we need to zap the node. */ if(dnp->linklist) { devnmp->nextlink = dnp->linklist; devnmp->prevlinkp = devnmp->nextlink->prevlinkp; devnmp->nextlink->prevlinkp = &(devnmp->nextlink); *devnmp->prevlinkp = devnmp; dnp->linklist = devnmp; } else { devnmp->nextlink = devnmp; devnmp->prevlinkp = &(devnmp->nextlink); dnp->linklist = devnmp; } /* * If the node is a directory, then we need to handle the * creation of the .. link. * A NULL dirnode indicates a root node, so point to ourself. */ if(dnp->type == DEV_DIR) { dnp->by.Dir.myname = devnmp; /* * If we are unlinking from an old dir, decrement its links * as we point our '..' elsewhere * Note: it's up to the calling code to remove the * us from the original directory's list */ if(dnp->by.Dir.parent) { dnp->by.Dir.parent->links--; } if(dirnode) { dnp->by.Dir.parent = dirnode; } else { dnp->by.Dir.parent = dnp; } dnp->by.Dir.parent->links++; /* account for the new '..' */ } /* * put the name into the directory entry. */ strcpy(devnmp->name, name); /* * Check if we are not making a root node.. * (i.e. have parent) */ if(dirnode) { /* * Put it on the END of the linked list of directory entries */ devnmp->parent = dirnode; /* null for root */ devnmp->prevp = dirnode->by.Dir.dirlast; devnmp->next = *(devnmp->prevp); /* should be NULL */ /*right?*/ *(devnmp->prevp) = devnmp; dirnode->by.Dir.dirlast = &(devnmp->next); dirnode->by.Dir.entrycount++; dirnode->len += strlen(name) + 8;/*ok, ok?*/ } *devnm_pp = devnmp; return 0 ; } /***********************************************************************\ * Add a new element to the devfs plane. * * * * Creates a new dev_node to go with it if the prototype should not be * * reused. (Is a DIR, or we select SPLIT_DEVS at compile time) * * 'by' gives us info to make our node if we don't have a prototype. * * If 'by is null and proto exists, then the 'by' field of * * the proto is used intead in the CREATE case. * * note the 'links' count is 0 (except if a dir) * * but it is only cleared on a transition * * so this is ok till we link it to something * * Even in SPLIT_DEVS mode, * * if the node already exists on the wanted plane, just return it * \***********************************************************************/ /*proto*/ int dev_add_node(int entrytype, union typeinfo *by, dn_p proto, dn_p *dn_pp,struct devfsmount *dvm) { dn_p dnp; DBPRINT(("dev_add_node\n")); #if defined SPLIT_DEVS /* * If we have a prototype, then check if there is already a sibling * on the mount plane we are looking at, if so, just return it. */ if (proto) { dnp = proto->nextsibling; while( dnp != proto) { if (dnp->dvm == dvm) { *dn_pp = dnp; return (0); } dnp = dnp->nextsibling; } if (by == NULL) by = &(proto->by); } #else /* SPLIT_DEVS */ if ( proto ) { switch (proto->type) { case DEV_BDEV: case DEV_CDEV: case DEV_DDEV: *dn_pp = proto; return 0; } } #endif /* SPLIT_DEVS */ if(!(dnp = (dn_p)malloc(sizeof(devnode_t), M_DEVFSNODE, M_NOWAIT))) { return ENOMEM; } /* * If we have a proto, that means that we are duplicating some * other device, which can only happen if we are not at the back plane */ if(proto) { bcopy(proto, dnp, sizeof(devnode_t)); dnp->links = 0; dnp->linklist = NULL; dnp->vn = NULL; dnp->len = 0; /* add to END of siblings list */ dnp->prevsiblingp = proto->prevsiblingp; *(dnp->prevsiblingp) = dnp; dnp->nextsibling = proto; proto->prevsiblingp = &(dnp->nextsibling); } else { /* * We have no prototype, so start off with a clean slate */ bzero(dnp,sizeof(devnode_t)); dnp->type = entrytype; getnanotime(&(dnp->ctime)); dnp->mtime = dnp->ctime; dnp->atime = dnp->ctime; dnp->nextsibling = dnp; dnp->prevsiblingp = &(dnp->nextsibling); } dnp->dvm = dvm; /* * fill out the dev node according to type */ switch(entrytype) { case DEV_DIR: /* * As it's a directory, make sure * it has a null entries list */ dnp->by.Dir.dirlast = &(dnp->by.Dir.dirlist); dnp->by.Dir.dirlist = (devnm_p)0; dnp->by.Dir.entrycount = 0; /* until we know better, it has a null parent pointer*/ dnp->by.Dir.parent = NULL; dnp->links++; /* for .*/ dnp->by.Dir.myname = NULL; /* * make sure that the ops associated with it are the ops * that we use (by default) for directories */ dnp->ops = &devfs_vnodeop_p; dnp->mode |= 0555; /* default perms */ break; case DEV_SLNK: /* * As it's a symlink allocate and store the link info * Symlinks should only ever be created by the user, * so they are not on the back plane and should not be * propogated forward.. a bit like directories in that way.. * A symlink only exists on one plane and has its own * node.. therefore we might be on any random plane. */ dnp->by.Slnk.name = malloc(by->Slnk.namelen+1, M_DEVFSNODE, M_NOWAIT); if (!dnp->by.Slnk.name) { free(dnp,M_DEVFSNODE); return ENOMEM; } strncpy(dnp->by.Slnk.name,by->Slnk.name,by->Slnk.namelen); dnp->by.Slnk.namelen = by->Slnk.namelen; dnp->ops = &devfs_vnodeop_p; dnp->mode |= 0555; /* default perms */ break; case DEV_BDEV: /* * Make sure it has DEVICE type ops * and device specific fields are correct */ dnp->ops = &dev_spec_vnodeop_p; dnp->by.Bdev.bdevsw = by->Bdev.bdevsw; dnp->by.Bdev.dev = by->Bdev.dev; break; case DEV_CDEV: /* * Make sure it has DEVICE type ops * and device specific fields are correct */ dnp->ops = &dev_spec_vnodeop_p; dnp->by.Cdev.cdevsw = by->Cdev.cdevsw; dnp->by.Cdev.dev = by->Cdev.dev; break; case DEV_DDEV: /* * store the address of (the address of) the ops * and the magic cookie to use with them */ dnp->by.Ddev.arg = by->Ddev.arg; dnp->by.Ddev.ops = by->Ddev.ops; dnp->ops = by->Ddev.ops; break; default: return EINVAL; } *dn_pp = dnp; return 0 ; } /*proto*/ int dev_touch(devnm_p key) /* update the node for this dev */ { DBPRINT(("dev_touch\n")); getnanotime(&(key->dnp->mtime)); return 0; /*XXX*/ } /*proto*/ void devfs_dn_free(dn_p dnp) { if(--dnp->links <= 0 ) /* can be -1 for initial free, on error */ { /*probably need to do other cleanups XXX */ if (dnp->nextsibling != dnp) { dn_p* prevp = dnp->prevsiblingp; *prevp = dnp->nextsibling; dnp->nextsibling->prevsiblingp = prevp; } if(dnp->type == DEV_SLNK) { free(dnp->by.Slnk.name,M_DEVFSNODE); } devfs_dropvnode(dnp); free (dnp, M_DEVFSNODE); } } /***********************************************************************\ * Front Node Operations * * Add or delete a chain of front nodes * \***********************************************************************/ /***********************************************************************\ * Given a directory backing node, and a child backing node, add the * * appropriate front nodes to the front nodes of the directory to * * represent the child node to the user * * * * on failure, front nodes will either be correct or not exist for each * * front dir, however dirs completed will not be stripped of completed * * frontnodes on failure of a later frontnode * * * * This allows a new node to be propogated through all mounted planes * * * \***********************************************************************/ /*proto*/ int devfs_propogate(devnm_p parent,devnm_p child) { int error; devnm_p newnmp; dn_p dnp = child->dnp; dn_p pdnp = parent->dnp; dn_p adnp = parent->dnp; int type = child->dnp->type; DBPRINT((" devfs_propogate\n")); /***********************************************\ * Find the other instances of the parent node * \***********************************************/ for (adnp = pdnp->nextsibling; adnp != pdnp; adnp = adnp->nextsibling) { /* * Make the node, using the original as a prototype) * if the node already exists on that plane it won't be * re-made.. */ if ( error = dev_add_entry(child->name, adnp, type, NULL, dnp, adnp->dvm, &newnmp)) { printf("duplicating %s failed\n",child->name); } } return 0; /* for now always succeed */ } /*********************************************************************** * remove all instances of this devicename [for backing nodes..] * note.. if there is another link to the node (non dir nodes only) * then the devfs_node will still exist as the ref count will be non-0 * removing a directory node will remove all sup-nodes on all planes (ZAP) * * Used by device drivers to remove nodes that are no longer relevant * The argument is the 'cookie' they were given when they created the node * this function is exported.. see sys/devfsext.h ***********************************************************************/ void devfs_remove_dev(void *devnmp) { dn_p dnp = ((devnm_p)devnmp)->dnp; dn_p dnp2; DBPRINT(("devfs_remove_dev\n")); /* keep removing the next sibling till only we exist. */ while((dnp2 = dnp->nextsibling) != dnp) { /* * Keep removing the next front node till no more exist */ dnp->nextsibling = dnp2->nextsibling; dnp->nextsibling->prevsiblingp = &(dnp->nextsibling); dnp2->nextsibling = dnp2; dnp2->prevsiblingp = &(dnp2->nextsibling); while(dnp2->linklist) { dev_free_name(dnp2->linklist); } } /* * then free the main node * If we are not running in SPLIT_DEVS mode, then * THIS is what gets rid of the propogated nodes. */ while(dnp->linklist) { dev_free_name(dnp->linklist); } return ; } /*************************************************************** * duplicate the backing tree into a tree of nodes hung off the * mount point given as the argument. Do this by * calling dev_dup_entry which recurses all the way * up the tree.. * If we are the first plane, just return the base root **************************************************************/ /*proto*/ int dev_dup_plane(struct devfsmount *devfs_mp_p) { devnm_p new; int error = 0; DBPRINT((" dev_dup_plane\n")); if(devfs_up_and_going) { if(error = dev_dup_entry(NULL, dev_root, &new, devfs_mp_p)) { return error; } } else { /* we are doing the dummy mount during initialisation.. */ new = dev_root; } devfs_mp_p->plane_root = new; return error; } /***************************************************************\ * Free a whole plane \***************************************************************/ /*proto*/ void devfs_free_plane(struct devfsmount *devfs_mp_p) { devnm_p devnmp; DBPRINT((" devfs_free_plane\n")); devnmp = devfs_mp_p->plane_root; if(devnmp) { dev_free_hier(devnmp); dev_free_name(devnmp); } devfs_mp_p->plane_root = NULL; } /***************************************************************\ * Create and link in a new front element.. * * Parent can be 0 for a root node * * Not presently usable to make a symlink XXX * * (Ok, symlinks don't propogate) * recursively will create subnodes corresponding to equivalent * * child nodes in the base level * \***************************************************************/ /*proto*/ int dev_dup_entry(dn_p parent, devnm_p back, devnm_p *dnm_pp, struct devfsmount *dvm) { devnm_p newnmp; devnm_p newback; devnm_p newfront; int error; dn_p dnp = back->dnp; int type = dnp->type; DBPRINT((" dev_dup_entry\n")); /* * go get the node made (if we need to) * use the back one as a prototype */ if ( error = dev_add_entry(back->name, parent, type, NULL, dnp, parent?parent->dvm:dvm, &newnmp)) { printf("duplicating %s failed\n",back->name); } /* * If we have just made the root, then insert the pointer to the * mount information */ if(dvm) { newnmp->dnp->dvm = dvm; } /* * If it is a directory, then recurse down all the other * subnodes in it.... * note that this time we don't pass on the mount info.. */ if (type == DEV_DIR) { for(newback = back->dnp->by.Dir.dirlist; newback; newback = newback->next) { if(error = dev_dup_entry(newnmp->dnp, newback, &newfront, NULL)) { break; /* back out with an error */ } } } *dnm_pp = newnmp; return error; } /***************************************************************\ * Free a name node * * remember that if there are other names pointing to the * * dev_node then it may not get freed yet * * can handle if there is no dnp * \***************************************************************/ /*proto*/ int dev_free_name(devnm_p devnmp) { dn_p parent = devnmp->parent; dn_p dnp = devnmp->dnp; DBPRINT((" dev_free_name\n")); if(dnp) { if(dnp->type == DEV_DIR) { if(dnp->by.Dir.dirlist) return (ENOTEMPTY); devfs_dn_free(dnp); /* account for '.' */ devfs_dn_free(dnp->by.Dir.parent); /* '..' */ } /* * unlink us from the list of links for this node * If we are the only link, it's easy! * if we are a DIR of course there should not be any * other links. */ if(devnmp->nextlink == devnmp) { dnp->linklist = NULL; } else { if(dnp->linklist == devnmp) { dnp->linklist = devnmp->nextlink; } devnmp->nextlink->prevlinkp = devnmp->prevlinkp; *devnmp->prevlinkp = devnmp->nextlink; } devfs_dn_free(dnp); } /* * unlink ourselves from the directory on this plane */ if(parent) /* if not fs root */ { if( (*devnmp->prevp = devnmp->next) )/* yes, assign */ { devnmp->next->prevp = devnmp->prevp; } else { parent->by.Dir.dirlast = devnmp->prevp; } parent->by.Dir.entrycount--; parent->len -= strlen(devnmp->name) + 8; } /***************************************************************\ * If the front node has its own devnode structure, * * then free it. * \***************************************************************/ free(devnmp,M_DEVFSNAME); return 0; } /***************************************************************\ * Free a hierarchy starting at a directory node name * * remember that if there are other names pointing to the * * dev_node then it may not get freed yet * * can handle if there is no dnp * * leave the node itself allocated. * \***************************************************************/ /*proto*/ void dev_free_hier(devnm_p devnmp) { dn_p dnp = devnmp->dnp; DBPRINT((" dev_free_hier\n")); if(dnp) { if(dnp->type == DEV_DIR) { while(dnp->by.Dir.dirlist) { dev_free_hier(dnp->by.Dir.dirlist); dev_free_name(dnp->by.Dir.dirlist); } } } } /*******************************************************\ ********************************************************* * ROUTINES to control the connection between devfs * * nodes and the system's vnodes * ********************************************************* \*******************************************************/ /*******************************************************\ * Theoretically this could be called for any kind of * * vnode, however in practice it must be a DEVFS vnode * \*******************************************************/ /*proto*/ int devfs_vntodn(struct vnode *vn_p, dn_p *dn_pp) { DBPRINT((" vntodn ")); if(vn_p->v_tag != VT_DEVFS) { printf("bad-tag2 "); Debugger("bad-tag "); return(EINVAL); } #if 0 /* * XXX: This is actually a "normal" case when vclean calls us without * XXX: incrementing the reference count first. */ if(vn_p->v_usecount == 0) { printf("No references! "); } #endif switch(vn_p->v_type) { case VBAD: printf("bad-type2 (VBAD)"); return(EINVAL); #if 0 case VNON: printf("bad-type2 (VNON)"); return(EINVAL); #endif } *dn_pp = (dn_p)vn_p->v_data; return(0); } #ifdef DEVFS_ROOT static dn_p findbdev(dev_t dev, dn_p dir) { devnm_p newfp; dn_p dnp; for(newfp = dir->by.Dir.dirlist;newfp;newfp=newfp->next) { dnp = newfp->dnp; if (dnp->type == DEV_BDEV && dnp->by.Bdev.dev == dev) { return (dnp); } if (dnp->type == DEV_DIR) { if (dnp = findbdev(dev, dnp)) return dnp; } } return (0); } /* * Create a vnode for a block device. * Used for mounting the root file system. */ int bdevvp(dev_t dev, struct vnode **vpp) { dn_p dnp = 0; if (dev == NODEV) return(0); dnp= findbdev(dev, dev_root->dnp); if (!dnp) return (ENOENT); return (devfs_dntovn(dnp, vpp)); } #endif /* DEVFS_ROOT */ /***************************************************************\ * given a dev_node, find the appropriate vnode if one is already* * associated, or get a new one an associate it with the dev_node* * need to check about vnode references.. should we increment it?* \***************************************************************/ /*proto*/ int devfs_dntovn(dn_p dnp, struct vnode **vn_pp) { struct vnode *vn_p, *nvp; int error = 0; struct proc *p = curproc; /* XXX */ vn_p = dnp->vn; DBPRINT(("dntovn ")); if( vn_p) { if(vn_p->v_id != dnp->vn_id) { #if 0 /* XXX: This is `normal'... */ printf("bad-id "); #endif goto skip; } if(vn_p->v_tag != VT_DEVFS) { #if 0 /* XXX: This is `normal'... */ printf("bad-tag "); #endif goto skip; } if(vn_p->v_op != *(dnp->ops)) { printf("bad-ops "); goto skip; } if((dn_p)(vn_p->v_data) != dnp) { printf("bad-rev_link "); goto skip; } if(vn_p->v_type != VNON) { vget(vn_p, LK_EXCLUSIVE, p); *vn_pp = vn_p; return(0); } else { printf("bad-type"); } skip: vn_p = (struct vnode *) 0; } if(!(error = getnewvnode(VT_DEVFS, dnp->dvm->mount, *(dnp->ops), &vn_p))) { dnp->vn = vn_p; dnp->vn_id = vn_p->v_id; *vn_pp = vn_p; DBPRINT(("(New vnode)")); switch(dnp->type) { case DEV_SLNK: vn_p->v_type = VLNK; break; case DEV_DIR: if(dnp->by.Dir.parent == dnp) { vn_p->v_flag |= VROOT; } vn_p->v_type = VDIR; break; case DEV_BDEV: vn_p->v_type = VBLK; if (nvp = checkalias(vn_p, dnp->by.Bdev.dev, (struct mount *)0)) { vput(vn_p); vn_p = nvp; } break; case DEV_CDEV: vn_p->v_type = VCHR; if (nvp = checkalias(vn_p, dnp->by.Cdev.dev, (struct mount *)0)) { vput(vn_p); vn_p = nvp; } break; case DEV_DDEV: break; } if ( vn_p) { vn_p->v_mount = dnp->dvm->mount;/* XXX Duplicated */ *vn_pp = vn_p; vn_p->v_data = (void *)dnp; } else { error = EINVAL; } vn_lock(vn_p, LK_EXCLUSIVE | LK_RETRY, p); } return error; } /***********************************************************************\ * add a whole device, with no prototype.. make name element and node * * Used for adding the original device entries * \***********************************************************************/ /*proto*/ int dev_add_entry(char *name, dn_p parent, int type, union typeinfo *by, dn_p proto, struct devfsmount *dvm, devnm_p *nm_pp) { dn_p dnp; int error = 0; DBPRINT((" devfs_add_entry\n")); if (error = dev_add_node(type, by, proto, &dnp, (parent?parent->dvm:dvm))) { printf("Device %s: base node allocation failed (Errno=%d)\n", name,error); return error; } if ( error = dev_add_name(name ,parent ,NULL, dnp, nm_pp)) { devfs_dn_free(dnp); /* 1->0 for dir, 0->(-1) for other */ printf("Device %s: name slot allocation failed (Errno=%d)\n", name,error); } return error; } /***********************************************************************\ * Add the named device entry into the given directory, and make it * * The appropriate type... (called (sometimes indirectly) by drivers..) * * this function is exported.. see sys/devfsext.h * * Has the capacity to take printf type arguments to format the device * * names * \***********************************************************************/ void * devfs_add_devswf(void *devsw, int minor, int chrblk, uid_t uid, gid_t gid, int perms, char *fmt, ...) { int major; devnm_p new_dev; dn_p dnp; /* devnode for parent directory */ struct cdevsw *cd; struct bdevsw *bd; int retval; union typeinfo by; va_list ap; char *name, *path, buf[256]; /* XXX */ int i; va_start(ap, fmt); i = kvprintf(fmt, NULL, (void*)buf, 32, ap); va_end(ap); buf[i] = '\0'; name = NULL; for(i=strlen(buf); i>0; i--) if(buf[i] == '/') { name=&buf[i]; buf[i]=0; break; } if (name) { *name++ = '\0'; path = buf; } else { name = buf; path = "/"; } DBPRINT(("dev_add\n")); retval = dev_finddir(path,NULL,1,&dnp); if (retval) return 0; switch(chrblk) { case DV_CHR: cd = devsw; major = cd->d_maj; if ( major == -1 ) return NULL; by.Cdev.cdevsw = cd; by.Cdev.dev = makedev(major, minor); if( dev_add_entry(name, dnp, DEV_CDEV, &by, NULL, NULL, &new_dev)) return NULL; break; case DV_BLK: bd = devsw; major = bd->d_maj; if ( major == -1 ) return NULL; by.Bdev.bdevsw = bd; by.Bdev.dev = makedev(major, minor); if( dev_add_entry(name, dnp, DEV_BDEV, &by, NULL, NULL, &new_dev)) return NULL; break; default: return NULL; } new_dev->dnp->gid = gid; new_dev->dnp->uid = uid; new_dev->dnp->mode |= perms; devfs_propogate(dnp->by.Dir.myname,new_dev); return new_dev; } /***********************************************************************\ * Add the named device entry into the given directory, and make it * * a link to the already created device given as an arg.. * * this function is exported.. see sys/devfsext.h * \***********************************************************************/ void * devfs_link(void *original, char *fmt, ...) { devnm_p new_dev; devnm_p orig = (devnm_p) original; dn_p dirnode; /* devnode for parent directory */ int retval; va_list ap; char *p, buf[256]; /* XXX */ int i; va_start(ap, fmt); i = kvprintf(fmt, NULL, (void*)buf, 32, ap); va_end(ap); buf[i] = '\0'; p = NULL; for(i=strlen(buf); i>0; i--) if(buf[i] == '/') { p=&buf[i]; buf[i]=0; break; } DBPRINT(("dev_add\n")); /* * The DEV_CDEV below is not used other than it must NOT be DEV_DIR * the correctness of original should be checked.. */ if (p) { *p++ = '\0'; retval = dev_finddir(buf,NULL,1,&dirnode); if (retval) return 0; if( dev_add_name(p, dirnode, NULL, orig->dnp, &new_dev)) return NULL; } else { retval = dev_finddir("/",NULL,1,&dirnode); if (retval) return 0; if( dev_add_name(buf, dirnode, NULL, orig->dnp, &new_dev)) return NULL; } devfs_propogate(dirnode->by.Dir.myname,new_dev); return new_dev; }