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freebsd-skq/sys/miscfs/devfs/devfs_vnops.c
Bruce Evans f57e65478d Introduced a type `vop_t' for vnode operation functions and used 
it 1138 times (:-() in casts and a few more times in declarations.
This change is null for the i386.

The type has to be `typedef int vop_t(void *)' and not `typedef
int vop_t()' because `gcc -Wstrict-prototypes' warns about the
latter.  Since vnode op functions are called with args of different
(struct pointer) types, neither of these function types is any use
for type checking of the arg, so it would be preferable not to use
the complete function type, especially since using the complete
type requires adding 1138 casts to avoid compiler warnings and
another 40+ casts to reverse the function pointer conversions before
calling the functions.
1995-11-09 08:17:23 +00:00

1777 lines
48 KiB
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/*
* Written by Julian Elischer (julian@DIALix.oz.au)
*
* $Header: /home/ncvs/src/sys/miscfs/devfs/devfs_vnops.c,v 1.15 1995/10/10 07:12:27 julian Exp $
*
* symlinks can wait 'til later.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
#include <sys/kernel.h>
#include <sys/file.h> /* define FWRITE ... */
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <miscfs/specfs/specdev.h>/* definitions of spec functions we use */
#include <sys/malloc.h>
#include <sys/dir.h> /* defines dirent structure */
/*#include "vnode_if.h"*/ /* must be included elsewhere (vnode.h?)*/
#include "devfsdefs.h"
/*
* Insert description here
*/
/*
* Convert a component of a pathname into a pointer to a locked node.
* This is a very central and rather complicated routine.
* If the file system is not maintained in a strict tree hierarchy,
* this can result in a deadlock situation (see comments in code below).
*
* The flag argument is LOOKUP, CREATE, RENAME, or DELETE depending on
* whether the name is to be looked up, created, renamed, or deleted.
* When CREATE, RENAME, or DELETE is specified, information usable in
* creating, renaming, or deleting a directory entry may be calculated.
* If flag has LOCKPARENT or'ed into it and the target of the pathname
* exists, lookup returns both the target and its parent directory locked.
* When creating or renaming and LOCKPARENT is specified, the target may
* not be ".". When deleting and LOCKPARENT is specified, the target may
* be "."., but the caller must check to ensure it does an vrele and DNUNLOCK
* instead of two DNUNLOCKs.
*
* Overall outline of devfs_lookup:
*
* check accessibility of directory
* null terminate the component (lookup leaves the whole string alone)
* look for name in cache, if found, then if at end of path
* and deleting or creating, drop it, else return name
* search for name in directory, to found or notfound
* notfound:
* if creating, return locked directory,
* else return error
* found:
* if at end of path and deleting, return information to allow delete
* if at end of path and rewriting (RENAME and LOCKPARENT), lock target
* node and return info to allow rewrite
* if not at end, add name to cache; if at end and neither creating
* nor deleting, add name to cache
* On return to lookup, remove the null termination we put in at the start.
*
* NOTE: (LOOKUP | LOCKPARENT) currently returns the parent node unlocked.
*/
int devfs_lookup(struct vop_lookup_args *ap) /*proto*/
/*struct vop_lookup_args {
struct vnode * a_dvp; directory vnode ptr
struct vnode ** a_vpp; where to put the result
struct componentname * a_cnp; the name we want
};*/
{
struct componentname *cnp = ap->a_cnp;
struct vnode *dir_vnode = ap->a_dvp;
struct vnode **result_vnode = ap->a_vpp;
dn_p dir_node; /* the directory we are searching */
dn_p new_node; /* the node we are searching for */
devnm_p new_nodename;
int flags = cnp->cn_flags;
int op = cnp->cn_nameiop; /* LOOKUP, CREATE, RENAME, or DELETE */
int lockparent = flags & LOCKPARENT;
int wantparent = flags & (LOCKPARENT|WANTPARENT);
int error = 0;
struct proc *p = cnp->cn_proc;
char heldchar; /* the char at the end of the name componet */
*result_vnode = NULL; /* safe not sorry */ /*XXX*/
DBPRINT(("lookup\n"));
if(dir_vnode->v_usecount == 0) printf("dir had no refs ");
if(devfs_vntodn(dir_vnode,&dir_node))
{
printf("vnode has changed?\n");
vprint("=",dir_vnode);
return(EINVAL);
}
/*
* Check accessiblity of directory.
*/
if (dir_node->type != DEV_DIR)
{
return (ENOTDIR);
}
if (error = VOP_ACCESS(dir_vnode, VEXEC, cnp->cn_cred, cnp->cn_proc))
{
return (error);
}
/*
* We now have a segment name to search for, and a directory to search.
*
* Before tediously performing a linear scan of the directory,
* check the name cache to see if the directory/name pair
* we are looking for is known already.
*/
#ifdef NOT_AT_THE_MOMENT
if (error = cache_lookup(dir_vnode, result_vnode, cnp)) {
int vpid; /* capability number of vnode */
if (error == ENOENT)
return (error); /* got an actual -ve hit */
DBPRINT(("cached "));
/*
* Claim the next vnode in the path.
* See comment below starting `Step through' for
* an explaination of the locking protocol.
*/
#ifdef MAYBE_NOT_NEEDED
if(devfs_vntodn(*result_vnode,&new_node))
{
printf("vnode has changed!?\n");
vprint("=",*result_vnode);
return(EINVAL);
}
#endif
vpid = (*result_vnode)->v_id;
if (dir_vnode == *result_vnode) { /* is "." */
VREF(*result_vnode); /* not a full vget() */
error = 0;
} else if (flags & ISDOTDOT) {/* do a locking dance */
VOP_UNLOCK(dir_vnode);
error = vget(*result_vnode,1);
if (!error && lockparent && (flags & ISLASTCN))
VOP_LOCK(dir_vnode);
} else {
error = vget(*result_vnode,1);
if (!lockparent || error || !(flags & ISLASTCN))
VOP_UNLOCK(dir_vnode);
}
/*
* Check that the capability number did not change
* while we were waiting for the lock.
*/
if (!error) {
if (vpid == (*result_vnode)->v_id)
return (0); /* SUCCCESS, return! */
vput((*result_vnode)); /* pretend we failed */
if (lockparent
&& (dir_vnode != *result_vnode)
&& (flags & ISLASTCN))
VOP_UNLOCK(dir_vnode);
} else { /* we have an error */
}
if( error = VOP_LOCK(dir_vnode))
return error;
*result_vnode = NULL; /* safe not sorry */
DBPRINT(("errr, maybe not cached "));
}
#endif
/***********************************************************************\
* SEARCH FOR NAME *
* while making sure the component is null terminated for the strcmp *
\***********************************************************************/
heldchar = cnp->cn_nameptr[cnp->cn_namelen];
cnp->cn_nameptr[cnp->cn_namelen] = '\0';
new_nodename = dev_findname(dir_node,cnp->cn_nameptr);
cnp->cn_nameptr[cnp->cn_namelen] = heldchar;
if(!new_nodename) {
/*******************************************************\
* Failed to find it.. (That may be good) *
\*******************************************************/
new_node = NULL; /* to be safe */
/*
* If creating, and at end of pathname
* then can consider
* allowing file to be created.
*/
if (!(flags & ISLASTCN) || !(op == CREATE || op == RENAME)) {
/*
* Insert name into cache
* (as non-existent) if appropriate.
*/
if ((cnp->cn_flags & MAKEENTRY) && op != CREATE)
cache_enter(dir_vnode, *result_vnode, cnp);
DBPRINT(("NOT\n"));
return ENOENT;
}
/*
* Access for write is interpreted as allowing
* creation of files in the directory.
*/
if (error = VOP_ACCESS(dir_vnode, VWRITE,
cnp->cn_cred, cnp->cn_proc))
{
DBPRINT(("MKACCESS "));
return (error);
}
/*
* We return with the directory locked, so that
* the parameters we set up above will still be
* valid if we actually decide to add a new entry.
* We return ni_vp == NULL to indicate that the entry
* does not currently exist; we leave a pointer to
* the (locked) directory vnode in namei_data->ni_dvp.
* The pathname buffer is saved so that the name
* can be obtained later.
*
* NB - if the directory is unlocked, then this
* information cannot be used.
*/
cnp->cn_flags |= SAVENAME; /*XXX why? */
if (!lockparent)
VOP_UNLOCK(dir_vnode);
return (EJUSTRETURN);
}
/***************************************************************\
* Found it.. this is not always a good thing.. *
\***************************************************************/
new_node = new_nodename->dnp;
new_node->last_lookup = new_nodename; /* for unlink */
/*
* If deleting, and at end of pathname, return
* parameters which can be used to remove file.
* If the wantparent flag isn't set, we return only
* the directory (in namei_data->ni_dvp), otherwise we go
* on and lock the node, being careful with ".".
*/
if (op == DELETE && (flags & ISLASTCN)) {
/*
* Write access to directory required to delete files.
*/
if (error = VOP_ACCESS(dir_vnode, VWRITE,
cnp->cn_cred, cnp->cn_proc))
return (error);
/*
* we are trying to delete '.'. What does this mean? XXX
*/
if (dir_node == new_node) {
VREF(dir_vnode);
*result_vnode = dir_vnode;
return (0);
}
/*
* If directory is "sticky", then user must own
* the directory, or the file in it, else she
* may not delete it (unless she's root). This
* implements append-only directories.
*/
devfs_dntovn(new_node,result_vnode);
VOP_LOCK((*result_vnode));
#ifdef NOTYET
if ((dir_node->mode & ISVTX) &&
cnp->cn_cred->cr_uid != 0 &&
cnp->cn_cred->cr_uid != dir_node->uid &&
new_node->uid != cnp->cn_cred->cr_uid) {
VOP_UNLOCK((*result_vnode));
return (EPERM);
}
#endif
if (!lockparent)
VOP_UNLOCK(dir_vnode);
return (0);
}
/*
* If rewriting (RENAME), return the vnode and the
* information required to rewrite the present directory
* Must get node of directory entry to verify it's a
* regular file, or empty directory.
*/
if (op == RENAME && wantparent && (flags & ISLASTCN)) {
/*
* Are we allowed to change the holding directory?
*/
if (error = VOP_ACCESS(dir_vnode, VWRITE,
cnp->cn_cred, cnp->cn_proc))
return (error);
/*
* Careful about locking second node.
* This can only occur if the target is ".".
*/
if (dir_node == new_node)
return (EISDIR);
devfs_dntovn(new_node,result_vnode);
VOP_LOCK(*result_vnode);
/* hmm save the 'from' name (we need to delete it) */
cnp->cn_flags |= SAVENAME;
if (!lockparent)
VOP_UNLOCK(dir_vnode);
return (0);
}
/*
* Step through the translation in the name. We do not unlock the
* directory because we may need it again if a symbolic link
* is relative to the current directory. Instead we save it
* unlocked as "saved_dir_node" XXX. We must get the target
* node before unlocking
* the directory to insure that the node will not be removed
* before we get it. We prevent deadlock by always fetching
* nodes from the root, moving down the directory tree. Thus
* when following backward pointers ".." we must unlock the
* parent directory before getting the requested directory.
* There is a potential race condition here if both the current
* and parent directories are removed before the lock for the
* node associated with ".." returns. We hope that this occurs
* infrequently since we cannot avoid this race condition without
* implementing a sophisticated deadlock detection algorithm.
* Note also that this simple deadlock detection scheme will not
* work if the file system has any hard links other than ".."
* that point backwards in the directory structure.
*/
if (flags & ISDOTDOT) {
VOP_UNLOCK(dir_vnode); /* race to get the node */
devfs_dntovn(new_node,result_vnode);
VOP_LOCK(*result_vnode);
if (lockparent && (flags & ISLASTCN))
VOP_LOCK(dir_vnode);
} else if (dir_node == new_node) {
VREF(dir_vnode); /* we want ourself, ie "." */
*result_vnode = dir_vnode;
} else {
devfs_dntovn(new_node,result_vnode);
VOP_LOCK(*result_vnode);
if (!lockparent || (flags & ISLASTCN))
VOP_UNLOCK(dir_vnode);
}
/*
* Insert name into cache if appropriate.
*/
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dir_vnode, *result_vnode, cnp);
DBPRINT(("GOT\n"));
return (0);
}
/*
* Create a regular file.
* We must also free the pathname buffer pointed at
* by ndp->ni_pnbuf, always on error, or only if the
* SAVESTART bit in ni_nameiop is clear on success.
* <still true in 4.4?>
*
* Always error... no such thing in this FS
*/
int devfs_create(struct vop_mknod_args *ap) /*proto*/
/*struct vop_mknod_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */
{
DBPRINT(("create\n"));
return EINVAL;
}
int devfs_mknod( struct vop_mknod_args *ap) /*proto*/
/*struct vop_mknod_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */
{
int error;
DBPRINT(("mknod\n"));
switch (ap->a_vap->va_type) {
case VDIR:
#ifdef VNSLEAZE
return devfs_mkdir(ap);
/*XXX check for WILLRELE settings (different)*/
#else
error = VOP_MKDIR(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap);
#endif
break;
/*
* devfs_create() sets ndp->ni_vp.
*/
case VREG:
#ifdef VNSLEAZE
return devfs_create(ap);
/*XXX check for WILLRELE settings (different)*/
#else
error = VOP_CREATE(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap);
#endif
break;
default:
return EINVAL;
break;
}
return error;
}
int devfs_open(struct vop_open_args *ap) /*proto*/
/*struct vop_open_args {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */
{
DBPRINT(("open\n"));
return 0;
}
int devfs_close( struct vop_close_args *ap) /*proto*/
/*struct vop_close_args {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */
{
DBPRINT(("close\n"));
return 0;
}
int devfs_access(struct vop_access_args *ap) /*proto*/
/*struct vop_access_args {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */
{
/*
* mode is filled with a combination of VREAD, VWRITE,
* and/or VEXEC bits turned on. In an octal number these
* are the Y in 0Y00.
*/
struct vnode *vp = ap->a_vp;
int mode = ap->a_mode;
struct ucred *cred = ap->a_cred;
struct proc *p = ap->a_p;
dn_p file_node;
int error;
gid_t *gp;
int i;
DBPRINT(("access\n"));
if (error = devfs_vntodn(vp,&file_node))
{
printf("devfs_vntodn returned %d ",error);
return error;
}
/*
* Root gets to do anything.
*/
if (cred->cr_uid == 0)
return 0;
/*
* Access check is based on only one of owner, group, public.
* If not owner, then check group. If not a member of the
* group, then check public access.
*/
if (cred->cr_uid != file_node->uid)
{
/* failing that.. try groups */
mode >>= 3;
gp = cred->cr_groups;
for (i = 0; i < cred->cr_ngroups; i++, gp++)
{
if (file_node->gid == *gp)
{
goto found;
}
}
/* failing that.. try general access */
mode >>= 3;
found:
;
}
if ((file_node->mode & mode) == mode)
return (0);
return (EACCES);
}
int devfs_getattr(struct vop_getattr_args *ap) /*proto*/
/*struct vop_getattr_args {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct proc *p = ap->a_p;
dn_p file_node;
int error;
DBPRINT(("getattr\n"));
if (error = devfs_vntodn(vp,&file_node))
{
printf("devfs_vntodn returned %d ",error);
return error;
}
vap->va_rdev = 0;/* default value only */
vap->va_mode = file_node->mode;
switch (file_node->type)
{
case DEV_DIR:
vap->va_rdev = (dev_t)file_node->dvm;
vap->va_mode |= (S_IFDIR);
break;
case DEV_CDEV:
vap->va_rdev = file_node->by.Cdev.dev;
vap->va_mode |= (S_IFCHR);
break;
case DEV_BDEV:
vap->va_rdev = file_node->by.Bdev.dev;
vap->va_mode |= (S_IFBLK);
break;
case DEV_SLNK:
break;
}
vap->va_type = vp->v_type;
vap->va_nlink = file_node->links;
vap->va_uid = file_node->uid;
vap->va_gid = file_node->gid;
vap->va_fsid = (long)file_node->dvm;
vap->va_fileid = (long)file_node;
vap->va_size = file_node->len; /* now a u_quad_t */
vap->va_blocksize = 512;
if(file_node->ctime.ts_sec)
{
vap->va_ctime = file_node->ctime;
}
else
{
TIMEVAL_TO_TIMESPEC(&boottime,&(vap->va_ctime));
}
if(file_node->mtime.ts_sec)
{
vap->va_mtime = file_node->mtime;
}
else
{
TIMEVAL_TO_TIMESPEC(&boottime,&(vap->va_mtime));
}
if(file_node->atime.ts_sec)
{
vap->va_atime = file_node->atime;
}
else
{
TIMEVAL_TO_TIMESPEC(&boottime,&(vap->va_atime));
}
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_bytes = file_node->len; /* u_quad_t */
vap->va_filerev = 0; /* XXX */ /* u_quad_t */
vap->va_vaflags = 0; /* XXX */
return 0;
}
int devfs_setattr(struct vop_setattr_args *ap) /*proto*/
/*struct vop_setattr_args {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct proc *p = ap->a_p;
int error = 0;
dn_p file_node;
if (error = devfs_vntodn(vp,&file_node))
{
printf("devfs_vntodn returned %d ",error);
return error;
}
DBPRINT(("setattr\n"));
if ((vap->va_type != VNON) ||
(vap->va_nlink != VNOVAL) ||
(vap->va_fsid != VNOVAL) ||
(vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) ||
(vap->va_rdev != VNOVAL) ||
(vap->va_bytes != VNOVAL) ||
(vap->va_gen != VNOVAL) ||
(vap->va_atime.ts_sec != VNOVAL))
{
return EINVAL;
}
if (vap->va_size != VNOVAL) {
return error; /*XXX (?) */
}
if (vap->va_atime.ts_sec != VNOVAL)
{
file_node->atime = vap->va_atime;
}
if (vap->va_mtime.ts_sec != VNOVAL)
{
file_node->mtime = vap->va_mtime;
}
if (vap->va_ctime.ts_sec != VNOVAL)
{
file_node->ctime = vap->va_ctime;
}
if (vap->va_mode != (u_short)VNOVAL)
{
/* set drwxwxrwx stuff */
file_node->mode &= ~07777;
file_node->mode |= vap->va_mode & 07777;
}
if (vap->va_uid != (uid_t)VNOVAL)
{
file_node->uid = vap->va_uid;
}
if (vap->va_gid != (gid_t)VNOVAL)
{
file_node->gid = vap->va_gid;
}
if (vap->va_flags != VNOVAL) {
if (error = suser(cred, &p->p_acflag))
return error;
if (cred->cr_uid == 0)
;
else {
}
}
return error;
}
int devfs_read(struct vop_read_args *ap) /*proto*/
/*struct vop_read_args {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */
{
int eof;
int error = 0;
dn_p file_node;
DBPRINT(("read\n"));
if (error = devfs_vntodn(ap->a_vp,&file_node))
{
printf("devfs_vntodn returned %d ",error);
return error;
}
switch (ap->a_vp->v_type) {
case VREG:
return(EINVAL);
case VDIR:
return VOP_READDIR(ap->a_vp,ap->a_uio,ap->a_cred,
NULL,NULL,NULL);
case VCHR:
case VBLK:
error = spec_read(ap);
TIMEVAL_TO_TIMESPEC(&time,&(file_node->atime))
return(error);
default:
panic("devfs_read(): bad file type");
break;
}
}
/*
* Write data to a file or directory.
*/
int devfs_write(struct vop_write_args *ap) /*proto*/
/*struct vop_write_args {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */
{
dn_p file_node;
int error;
if (error = devfs_vntodn(ap->a_vp,&file_node))
{
printf("devfs_vntodn returned %d ",error);
return error;
}
DBPRINT(("write\n"));
switch (ap->a_vp->v_type) {
case VREG:
return(EINVAL);
case VDIR:
return(EISDIR);
case VCHR:
case VBLK:
error = spec_write(ap);
TIMEVAL_TO_TIMESPEC(&time,&(file_node->mtime))
return(error);
default:
panic("devfs_write(): bad file type");
break;
}
}
/* presently not called from devices anyhow */
int devfs_ioctl(struct vop_ioctl_args *ap) /*proto*/
/*struct vop_ioctl_args {
struct vnode *a_vp;
int a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */
{
DBPRINT(("ioctl\n"));
return ENOTTY;
}
int devfs_select(struct vop_select_args *ap) /*proto*/
/*struct vop_select_args {
struct vnode *a_vp;
int a_which;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */
{
DBPRINT(("select\n"));
return 1; /* filesystems never block? */
}
int devfs_mmap(struct vop_mmap_args *ap) /*proto*/
/*struct vop_mmap_args {
struct vnode *a_vp;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */
{
DBPRINT(("mmap\n"));
return EINVAL;
}
/*
* Flush the blocks of a file to disk.
*/
int devfs_fsync(struct vop_fsync_args *ap) /*proto*/
/*struct vop_fsync_args {
struct vnode *a_vp;
struct ucred *a_cred;
int a_waitfor;
struct proc *a_p;
} */
{
DBPRINT(("fsync\n"));
return(0);
}
int devfs_seek(struct vop_seek_args *ap) /*proto*/
/*struct vop_seek_args {
struct vnode *a_vp;
off_t a_oldoff;
off_t a_newoff;
struct ucred *a_cred;
} */
{
int error = 0;
DBPRINT(("seek\n"));
return 0;
}
int devfs_remove(struct vop_remove_args *ap) /*proto*/
/*struct vop_remove_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */
{
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
dn_p tp, tdp;
devnm_p tnp;
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
uid_t ouruid = cnp->cn_cred->cr_uid;
DBPRINT(("remove\n"));
/*
* Lock our directories and get our name pointers
* assume that the names are null terminated as they
* are the end of the path. Get pointers to all our
* devfs structures.
*/
if ( error = devfs_vntodn(dvp,&tdp)) {
abortit:
VOP_ABORTOP(dvp, cnp);
if (dvp == vp) /* eh? */
vrele(dvp);
else
vput(dvp);
if (vp)
vput(vp);
return (error);
}
if ( error = devfs_vntodn(vp,&tp)) goto abortit;
/*
* Assuming we are atomic, dev_lookup left this for us
*/
tnp = tp->last_lookup;
/*
* Check we are doing legal things WRT the new flags
*/
if ((tp->flags & (IMMUTABLE | APPEND))
|| (tdp->flags & APPEND) /*XXX eh?*/ ) {
error = EPERM;
goto abortit;
}
/*
* Make sure that we don't try do something stupid
*/
if ((tp->type) == DEV_DIR) {
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ( (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.')
|| (cnp->cn_flags&ISDOTDOT) ) {
error = EINVAL;
goto abortit;
}
doingdirectory++;
}
/***********************************
* Start actually doing things.... *
***********************************/
TIMEVAL_TO_TIMESPEC(&time,&(tdp->mtime));
/*
* own the parent directory, or the destination of the rename,
* otherwise the destination may not be changed (except by
* root). This implements append-only directories.
* XXX shoudn't this be in generic code?
*/
if ((tdp->mode & S_ISTXT)
&& ouruid != 0
&& ouruid != tdp->uid
&& ouruid != tp->uid ) {
error = EPERM;
goto abortit;
}
/*
* Target must be empty if a directory and have no links
* to it. Also, ensure source and target are compatible
* (both directories, or both not directories).
*/
if (( doingdirectory) && (tp->links > 2)) {
printf("nlink = %d\n",tp->links); /*XXX*/
error = ENOTEMPTY;
goto abortit;
}
cache_purge(vp); /*XXX*/
dev_free_name(tnp);
tp = NULL;
vput(dvp);
return (error);
}
/*
*/
int devfs_link(struct vop_link_args *ap) /*proto*/
/*struct vop_link_args {
struct vnode *a_tdvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */
{
struct vnode *vp = ap->a_vp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *cnp = ap->a_cnp;
dn_p fp, tdp;
devnm_p tnp;
int doingdirectory = 0;
int error = 0;
uid_t outuid = cnp->cn_cred->cr_uid;
DBPRINT(("link\n"));
/*
* First catch an arbitrary restriction for this FS
*/
if(cnp->cn_namelen > DEVMAXNAMESIZE) {
error = ENAMETOOLONG;
goto abortit;
}
/*
* Lock our directories and get our name pointers
* assume that the names are null terminated as they
* are the end of the path. Get pointers to all our
* devfs structures.
*/
if ( error = devfs_vntodn(tdvp,&tdp)) goto abortit;
if ( error = devfs_vntodn(vp,&fp)) goto abortit;
/*
* trying to move it out of devfs? (v_tag == VT_DEVFS)
*/
if ( (vp->v_tag != VT_DEVFS)
|| (vp->v_tag != tdvp->v_tag) ) {
error = EXDEV;
abortit:
VOP_ABORTOP(tdvp, cnp);
goto out;
}
/*
* Check we are doing legal things WRT the new flags
*/
if ((fp->flags & (IMMUTABLE | APPEND))
|| (tdp->flags & APPEND) /*XXX eh?*/ ) {
error = EPERM;
goto abortit;
}
/***********************************
* Start actually doing things.... *
***********************************/
TIMEVAL_TO_TIMESPEC(&time,&(tdp->atime));
error = dev_add_name(cnp->cn_nameptr,
tdp,
NULL,
fp,
&tnp);
out:
vrele(vp);
vput(tdvp);
return (error);
}
/*
* Rename system call. Seems overly complicated to me...
* rename("foo", "bar");
* is essentially
* unlink("bar");
* link("foo", "bar");
* unlink("foo");
* but ``atomically''.
*
* When the target exists, both the directory
* and target vnodes are locked.
* the source and source-parent vnodes are referenced
*
*
* Basic algorithm is:
*
* 1) Bump link count on source while we're linking it to the
* target. This also ensure the inode won't be deleted out
* from underneath us while we work (it may be truncated by
* a concurrent `trunc' or `open' for creation).
* 2) Link source to destination. If destination already exists,
* delete it first.
* 3) Unlink source reference to node if still around. If a
* directory was moved and the parent of the destination
* is different from the source, patch the ".." entry in the
* directory.
*/
int devfs_rename(struct vop_rename_args *ap) /*proto*/
/*struct vop_rename_args {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
} */
{
struct vnode *tvp = ap->a_tvp;
struct vnode *tdvp = ap->a_tdvp;
struct vnode *fvp = ap->a_fvp;
struct vnode *fdvp = ap->a_fdvp;
struct componentname *tcnp = ap->a_tcnp;
struct componentname *fcnp = ap->a_fcnp;
dn_p fp, fdp, tp, tdp;
devnm_p fnp,tnp;
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
uid_t outuid = tcnp->cn_cred->cr_uid;
/*
* First catch an arbitrary restriction for this FS
*/
if(tcnp->cn_namelen > DEVMAXNAMESIZE) {
error = ENAMETOOLONG;
goto abortit;
}
/*
* Lock our directories and get our name pointers
* assume that the names are null terminated as they
* are the end of the path. Get pointers to all our
* devfs structures.
*/
if ( error = devfs_vntodn(tdvp,&tdp)) goto abortit;
if ( error = devfs_vntodn(fdvp,&fdp)) goto abortit;
if ( error = devfs_vntodn(fvp,&fp)) goto abortit;
fnp = fp->last_lookup;
if (tvp) {
if ( error = devfs_vntodn(tvp,&tp)) goto abortit;
tnp = tp->last_lookup;
} else {
tp = NULL;
tnp = NULL;
}
/*
* trying to move it out of devfs? (v_tag == VT_DEVFS)
* if we move a dir across mnt points. we need to fix all
* the mountpoint pointers! XXX
* so for now keep dirs within the same mount
*/
if ( (fvp->v_tag != VT_DEVFS)
|| (fvp->v_tag != tdvp->v_tag)
|| (tvp && (fvp->v_tag != tvp->v_tag))
|| ((fp->type == DEV_DIR) && (fp->dvm != tdp->dvm ))) {
error = EXDEV;
abortit:
VOP_ABORTOP(tdvp, tcnp);
if (tdvp == tvp) /* eh? */
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* Check we are doing legal things WRT the new flags
*/
if ((tp && (tp->flags & (IMMUTABLE | APPEND)))
|| (fp->flags & (IMMUTABLE | APPEND))
|| (tdp->flags & APPEND) /*XXX eh?*/
|| (fdp->flags & APPEND)) {
error = EPERM;
goto abortit;
}
/*
* Make sure that we don't try do something stupid
*/
if ((fp->type) == DEV_DIR) {
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')
|| (fcnp->cn_flags&ISDOTDOT)
|| (tcnp->cn_namelen == 1 && tcnp->cn_nameptr[0] == '.')
|| (tcnp->cn_flags&ISDOTDOT)
|| (tdp == fp )) {
error = EINVAL;
goto abortit;
}
doingdirectory++;
}
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory heirarchy above the target, as this would
* orphan everything below the source directory. Also
* the user must have write permission in the source so
* as to be able to change "..".
*/
if (doingdirectory && (tdp != fdp)) {
dn_p tmp,ntmp;
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
tmp = tdp;
do {
if(tmp == fp) {
/* XXX unlock stuff here probably */
error = EINVAL;
goto out;
}
ntmp = tmp;
} while ((tmp = tmp->by.Dir.parent) != ntmp);
}
/***********************************
* Start actually doing things.... *
***********************************/
TIMEVAL_TO_TIMESPEC(&time,&(fp->atime));
/*
* Check if just deleting a link name.
*/
if (fvp == tvp) {
if (fvp->v_type == VDIR) {
error = EINVAL;
goto abortit;
}
/* Release destination completely. */
VOP_ABORTOP(tdvp, tcnp);
vput(tdvp);
vput(tvp);
/* Delete source. */
VOP_ABORTOP(fdvp, fcnp); /*XXX*/
vrele(fdvp);
vrele(fvp);
dev_free_name(fnp);
return 0;
}
/*
* 1) Bump link count while we're moving stuff
* around. If we crash somewhere before
* completing our work, too bad :)
*/
fp->links++;
/*
* If the target exists zap it (unless it's a non-empty directory)
* We could do that as well but won't
*/
if (tp) {
int ouruid = tcnp->cn_cred->cr_uid;
/*
* If the parent directory is "sticky", then the user must
* own the parent directory, or the destination of the rename,
* otherwise the destination may not be changed (except by
* root). This implements append-only directories.
* XXX shoudn't this be in generic code?
*/
if ((tdp->mode & S_ISTXT)
&& ouruid != 0
&& ouruid != tdp->uid
&& ouruid != tp->uid ) {
error = EPERM;
goto bad;
}
/*
* Target must be empty if a directory and have no links
* to it. Also, ensure source and target are compatible
* (both directories, or both not directories).
*/
if (( doingdirectory) && (tp->links > 2)) {
printf("nlink = %d\n",tp->links); /*XXX*/
error = ENOTEMPTY;
goto bad;
}
cache_purge(tvp); /*XXX*/
dev_free_name(tnp);
tp = NULL;
}
dev_add_name(tcnp->cn_nameptr,tdp,fnp->as.front.realthing,fp,&tnp);
fnp->dnp = NULL;
fp->links--; /* one less link to it.. */
dev_free_name(fnp);
fp->links--; /* we added one earlier*/
if (tdp)
vput(tdvp);
if (tp)
vput(fvp);
vrele(ap->a_fvp);
return (error);
bad:
if (tp)
vput(tvp);
vput(tdvp);
out:
if (VOP_LOCK(fvp) == 0) {
fp->links--; /* we added one earlier*/
vput(fvp);
} else
vrele(fvp);
return (error);
}
int devfs_mkdir(struct vop_mkdir_args *ap) /*proto*/
/*struct vop_mkdir_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */
{
DBPRINT(("mkdir\n"));
return EINVAL;
}
int devfs_rmdir(struct vop_rmdir_args *ap) /*proto*/
/*struct vop_rmdir_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */
{
DBPRINT(("rmdir\n"));
return 0;
}
int devfs_symlink(struct vop_symlink_args *ap) /*proto*/
/*struct vop_symlink_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */
{
return EINVAL;
DBPRINT(("symlink\n"));
}
/*
* Vnode op for readdir
*/
int devfs_readdir(struct vop_readdir_args *ap) /*proto*/
/*struct vop_readdir_args {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *eofflag;
int *ncookies;
u_int **cookies;
} */
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct ucred *cred = ap->a_cred;
struct dirent dirent;
dn_p dir_node;
devnm_p name_node;
char *name;
int error = 0;
int reclen;
int nodenumber;
int startpos,pos;
DBPRINT(("readdir\n"));
/* set up refs to dir */
if (error = devfs_vntodn(vp,&dir_node))
return error;
if(dir_node->type != DEV_DIR)
return(ENOTDIR);
pos = 0;
startpos = uio->uio_offset;
name_node = dir_node->by.Dir.dirlist;
nodenumber = 0;
TIMEVAL_TO_TIMESPEC(&time,&(dir_node->atime))
while ((name_node || (nodenumber < 2)) && (uio->uio_resid > 0))
{
switch(nodenumber)
{
case 0:
dirent.d_fileno = (unsigned long int)dir_node;
name = ".";
dirent.d_namlen = 1;
dirent.d_type = DT_DIR;
break;
case 1:
if(dir_node->by.Dir.parent)
dirent.d_fileno
= (unsigned long int)dir_node->by.Dir.parent;
else
dirent.d_fileno = (unsigned long int)dir_node;
name = "..";
dirent.d_namlen = 2;
dirent.d_type = DT_DIR;
break;
default:
dirent.d_fileno =
(unsigned long int)name_node->dnp;
dirent.d_namlen = strlen(name_node->name);
name = name_node->name;
switch(name_node->dnp->type) {
case DEV_BDEV:
dirent.d_type = DT_BLK;
break;
case DEV_CDEV:
dirent.d_type = DT_CHR;
break;
case DEV_DDEV:
dirent.d_type = DT_SOCK; /*XXX*/
break;
case DEV_DIR:
dirent.d_type = DT_DIR;
break;
case DEV_SLNK:
dirent.d_type = DT_LNK;
break;
default:
dirent.d_type = DT_UNKNOWN;
}
}
reclen = dirent.d_reclen = DIRSIZ (&dirent);
if(pos >= startpos) /* made it to the offset yet? */
{
if (uio->uio_resid < reclen) /* will it fit? */
break;
strcpy( dirent.d_name,name);
if (error = uiomove ((caddr_t)&dirent,
dirent.d_reclen, uio))
break;
}
pos += reclen;
if((nodenumber >1) && name_node)
name_node = name_node->next;
nodenumber++;
}
uio->uio_offset = pos;
return (error);
}
/*
*/
int devfs_readlink(struct vop_readlink_args *ap) /*proto*/
/*struct vop_readlink_args {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */
{
DBPRINT(("readlink\n"));
return 0;
}
int devfs_abortop(struct vop_abortop_args *ap) /*proto*/
/*struct vop_abortop_args {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */
{
DBPRINT(("abortop\n"));
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
return 0;
}
int devfs_inactive(struct vop_inactive_args *ap) /*proto*/
/*struct vop_inactive_args {
struct vnode *a_vp;
} */
{
DBPRINT(("inactive\n"));
return 0;
}
int devfs_lock(struct vop_lock_args *ap) /*proto*/
{
DBPRINT(("lock\n"));
return 0;
}
int devfs_unlock( struct vop_unlock_args *ap) /*proto*/
{
DBPRINT(("unlock\n"));
return 0;
}
int devfs_islocked(struct vop_islocked_args *ap) /*proto*/
/*struct vop_islocked_args {
struct vnode *a_vp;
} */
{
DBPRINT(("islocked\n"));
return 0;
}
int devfs_bmap(struct vop_bmap_args *ap) /*proto*/
/*struct vop_bmap_args {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
int *a_runb;
} */
{
DBPRINT(("bmap\n"));
return 0;
}
int devfs_strategy(struct vop_strategy_args *ap) /*proto*/
/*struct vop_strategy_args {
struct buf *a_bp;
} */
{
struct vnode *vp;
int error;
DBPRINT(("strategy\n"));
if (ap->a_bp->b_vp->v_type == VBLK || ap->a_bp->b_vp->v_type == VCHR)
printf("devfs_strategy: spec");
return 0;
}
int devfs_advlock(struct vop_advlock_args *ap) /*proto*/
/*struct vop_advlock_args {
struct vnode *a_vp;
caddr_t a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */
{
DBPRINT(("advlock\n"));
return EINVAL; /* we don't do locking yet */
}
int devfs_reclaim(struct vop_reclaim_args *ap) /*proto*/
/*struct vop_reclaim_args {
struct vnode *a_vp;
} */
{
dn_p file_node;
int error;
DBPRINT(("reclaim\n"));
if (error = devfs_vntodn(ap->a_vp,&file_node))
{
printf("devfs_vntodn returned %d ",error);
return error;
}
file_node->vn = 0;
file_node->vn_id = 0;
return(0);
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
int devfs_pathconf(struct vop_pathconf_args *ap) /*proto*/
/*struct vop_pathconf_args {
struct vnode *a_vp;
int a_name;
int *a_retval;
} */
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Print out the contents of a /devfs vnode.
*/
int devfs_print(struct vop_print_args *ap) /*proto*/
/*struct vop_print_args {
struct vnode *a_vp;
} */
{
printf("tag VT_DEVFS, devfs vnode\n");
return (0);
}
int devfs_vfree(struct vop_vfree_args *ap) /*proto*/
/*struct vop_vfree_args {
struct vnode *a_pvp;
ino_t a_ino;
int a_mode;
} */
{
return (0);
}
/**************************************************************************\
* pseudo ops *
\**************************************************************************/
/*
* /devfs vnode unsupported operation
*/
int devfs_enotsupp(void *junk) /*proto*/
{
return (EOPNOTSUPP);
}
/*
* /devfs "should never get here" operation
*/
int devfs_badop(void *junk) /*proto*/
{
panic("devfs: bad op");
/* NOTREACHED */
}
/*
* devfs vnode null operation
*/
int devfs_nullop(void *junk) /*proto*/
{
return (0);
}
void devfs_dropvnode(dn_p dnp) /*proto*/
{
struct vnode *vn_p;
#ifdef PARANOID
if(!dnp)
{
printf("devfs: dn count dropped too early\n");
}
#endif
vn_p = dnp->vn;
/*
* check if we have a vnode.......
*/
if((vn_p) && ( dnp->vn_id == vn_p->v_id) && (dnp == (dn_p)vn_p->v_data))
{
vgoneall(vn_p);
}
dnp->vn = NULL; /* be pedantic about this */
}
#define devfs_create ((int (*) __P((struct vop_create_args *)))devfs_enotsupp)
#define devfs_mknod ((int (*) __P((struct vop_mknod_args *)))devfs_enotsupp)
#define devfs_close ((int (*) __P((struct vop_close_args *)))nullop)
#define devfs_ioctl ((int (*) __P((struct vop_ioctl_args *)))devfs_enotsupp)
#define devfs_select ((int (*) __P((struct vop_select_args *)))devfs_enotsupp)
#define devfs_mmap ((int (*) __P((struct vop_mmap_args *)))devfs_enotsupp)
#define devfs_fsync ((int (*) __P((struct vop_fsync_args *)))nullop)
#define devfs_seek ((int (*) __P((struct vop_seek_args *)))nullop)
#define devfs_mkdir ((int (*) __P((struct vop_mkdir_args *)))devfs_enotsupp)
#define devfs_rmdir ((int (*) __P((struct vop_rmdir_args *)))devfs_enotsupp)
#define devfs_symlink ((int (*) __P((struct vop_symlink_args *)))devfs_enotsupp)
#define devfs_readlink \
((int (*) __P((struct vop_readlink_args *)))devfs_enotsupp)
#define devfs_abortop ((int (*) __P((struct vop_abortop_args *)))nullop)
#define devfs_lock ((int (*) __P((struct vop_lock_args *)))nullop)
#define devfs_unlock ((int (*) __P((struct vop_unlock_args *)))nullop)
#define devfs_bmap ((int (*) __P((struct vop_bmap_args *)))devfs_badop)
#define devfs_strategy ((int (*) __P((struct vop_strategy_args *)))devfs_badop)
#define devfs_islocked ((int (*) __P((struct vop_islocked_args *)))nullop)
#define devfs_advlock ((int (*) __P((struct vop_advlock_args *)))devfs_enotsupp)
#define devfs_blkatoff \
((int (*) __P((struct vop_blkatoff_args *)))devfs_enotsupp)
#define devfs_valloc ((int(*) __P(( \
struct vnode *pvp, \
int mode, \
struct ucred *cred, \
struct vnode **vpp))) devfs_enotsupp)
#define devfs_truncate \
((int (*) __P((struct vop_truncate_args *)))devfs_enotsupp)
#define devfs_update ((int (*) __P((struct vop_update_args *)))devfs_enotsupp)
#define devfs_bwrite ((int (*) __P((struct vop_bwrite_args *)))devfs_enotsupp)
/* These are the operations used by directories etc in a devfs */
vop_t **devfs_vnodeop_p;
struct vnodeopv_entry_desc devfs_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *)vn_default_error },
{ &vop_lookup_desc, (vop_t *)devfs_lookup }, /* lookup */
{ &vop_create_desc, (vop_t *)devfs_create }, /* create */
{ &vop_mknod_desc, (vop_t *)devfs_mknod }, /* mknod */
{ &vop_open_desc, (vop_t *)devfs_open }, /* open */
{ &vop_close_desc, (vop_t *)devfs_close }, /* close */
{ &vop_access_desc, (vop_t *)devfs_access }, /* access */
{ &vop_getattr_desc, (vop_t *)devfs_getattr }, /* getattr */
{ &vop_setattr_desc, (vop_t *)devfs_setattr }, /* setattr */
{ &vop_read_desc, (vop_t *)devfs_read }, /* read */
{ &vop_write_desc, (vop_t *)devfs_write }, /* write */
{ &vop_ioctl_desc, (vop_t *)devfs_ioctl }, /* ioctl */
{ &vop_select_desc, (vop_t *)devfs_select }, /* select */
{ &vop_mmap_desc, (vop_t *)devfs_mmap }, /* mmap */
{ &vop_fsync_desc, (vop_t *)devfs_fsync }, /* fsync */
{ &vop_seek_desc, (vop_t *)devfs_seek }, /* seek */
{ &vop_remove_desc, (vop_t *)devfs_remove }, /* remove */
{ &vop_link_desc, (vop_t *)devfs_link }, /* link */
{ &vop_rename_desc, (vop_t *)devfs_rename }, /* rename */
{ &vop_mkdir_desc, (vop_t *)devfs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, (vop_t *)devfs_rmdir }, /* rmdir */
{ &vop_symlink_desc, (vop_t *)devfs_symlink }, /* symlink */
{ &vop_readdir_desc, (vop_t *)devfs_readdir }, /* readdir */
{ &vop_readlink_desc, (vop_t *)devfs_readlink }, /* readlink */
{ &vop_abortop_desc, (vop_t *)devfs_abortop }, /* abortop */
{ &vop_inactive_desc, (vop_t *)devfs_inactive }, /* inactive */
{ &vop_reclaim_desc, (vop_t *)devfs_reclaim }, /* reclaim */
{ &vop_lock_desc, (vop_t *)devfs_lock }, /* lock */
{ &vop_unlock_desc, (vop_t *)devfs_unlock }, /* unlock */
{ &vop_bmap_desc, (vop_t *)devfs_bmap }, /* bmap */
{ &vop_strategy_desc, (vop_t *)devfs_strategy }, /* strategy */
{ &vop_print_desc, (vop_t *)devfs_print }, /* print */
{ &vop_islocked_desc, (vop_t *)devfs_islocked }, /* islocked */
{ &vop_pathconf_desc, (vop_t *)devfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, (vop_t *)devfs_advlock }, /* advlock */
{ &vop_blkatoff_desc, (vop_t *)devfs_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, (vop_t *)devfs_valloc }, /* valloc */
{ &vop_vfree_desc, (vop_t *)devfs_vfree }, /* vfree */
{ &vop_truncate_desc, (vop_t *)devfs_truncate }, /* truncate */
{ &vop_update_desc, (vop_t *)devfs_update }, /* update */
{ &vop_bwrite_desc, (vop_t *)devfs_bwrite }, /* bwrite */
{ NULL, NULL }
};
struct vnodeopv_desc devfs_vnodeop_opv_desc =
{ &devfs_vnodeop_p, devfs_vnodeop_entries };
VNODEOP_SET(devfs_vnodeop_opv_desc);
/*copied in from specfs/spec_vnops.c.. (spot the changes )*/
/* These are the operations used by special devices in a devfs */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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.
*
* @(#)spec_vnops.c 8.6 (Berkeley) 4/9/94
* spec_vnops.c,v 1.9 1994/11/14 13:22:52 bde Exp
*/
vop_t **dev_spec_vnodeop_p;
struct vnodeopv_entry_desc dev_spec_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *)vn_default_error },
{ &vop_lookup_desc, (vop_t *)spec_lookup }, /* lookup */
{ &vop_create_desc, (vop_t *)spec_create }, /* create */
{ &vop_mknod_desc, (vop_t *)spec_mknod }, /* mknod */
{ &vop_open_desc, (vop_t *)spec_open }, /* open */
{ &vop_close_desc, (vop_t *)spec_close }, /* close */
{ &vop_access_desc, (vop_t *)devfs_access }, /* access */
{ &vop_getattr_desc, (vop_t *)devfs_getattr }, /* getattr */
{ &vop_setattr_desc, (vop_t *)devfs_setattr }, /* setattr */
{ &vop_read_desc, (vop_t *)spec_read }, /* read */
{ &vop_write_desc, (vop_t *)spec_write }, /* write */
{ &vop_ioctl_desc, (vop_t *)spec_ioctl }, /* ioctl */
{ &vop_select_desc, (vop_t *)spec_select }, /* select */
{ &vop_mmap_desc, (vop_t *)spec_mmap }, /* mmap */
{ &vop_fsync_desc, (vop_t *)spec_fsync }, /* fsync */
{ &vop_seek_desc, (vop_t *)spec_seek }, /* seek */
{ &vop_remove_desc, (vop_t *)spec_remove }, /* remove */
{ &vop_link_desc, (vop_t *)spec_link }, /* link */
{ &vop_rename_desc, (vop_t *)spec_rename }, /* rename */
{ &vop_mkdir_desc, (vop_t *)spec_mkdir }, /* mkdir */
{ &vop_rmdir_desc, (vop_t *)spec_rmdir }, /* rmdir */
{ &vop_symlink_desc, (vop_t *)spec_symlink }, /* symlink */
{ &vop_readdir_desc, (vop_t *)spec_readdir }, /* readdir */
{ &vop_readlink_desc, (vop_t *)spec_readlink }, /* readlink */
{ &vop_abortop_desc, (vop_t *)spec_abortop }, /* abortop */
{ &vop_inactive_desc, (vop_t *)spec_inactive }, /* inactive */
{ &vop_reclaim_desc, (vop_t *)spec_reclaim }, /* reclaim */
{ &vop_lock_desc, (vop_t *)spec_lock }, /* lock */
{ &vop_unlock_desc, (vop_t *)spec_unlock }, /* unlock */
{ &vop_bmap_desc, (vop_t *)spec_bmap }, /* bmap */
{ &vop_strategy_desc, (vop_t *)spec_strategy }, /* strategy */
{ &vop_print_desc, (vop_t *)spec_print }, /* print */
{ &vop_islocked_desc, (vop_t *)spec_islocked }, /* islocked */
{ &vop_pathconf_desc, (vop_t *)spec_pathconf }, /* pathconf */
{ &vop_advlock_desc, (vop_t *)spec_advlock }, /* advlock */
{ &vop_blkatoff_desc, (vop_t *)spec_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, (vop_t *)spec_valloc }, /* valloc */
{ &vop_vfree_desc, (vop_t *)spec_vfree }, /* vfree */
{ &vop_truncate_desc, (vop_t *)spec_truncate }, /* truncate */
{ &vop_update_desc, (vop_t *)spec_update }, /* update */
{ &vop_bwrite_desc, (vop_t *)spec_bwrite }, /* bwrite */
{ NULL, NULL }
};
struct vnodeopv_desc dev_spec_vnodeop_opv_desc =
{ &dev_spec_vnodeop_p, dev_spec_vnodeop_entries };
VNODEOP_SET(dev_spec_vnodeop_opv_desc);
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