summaryrefslogtreecommitdiff
path: root/sys/compat/linux
diff options
context:
space:
mode:
Diffstat (limited to 'sys/compat/linux')
-rw-r--r--sys/compat/linux/linux_getcwd.c542
1 files changed, 0 insertions, 542 deletions
diff --git a/sys/compat/linux/linux_getcwd.c b/sys/compat/linux/linux_getcwd.c
deleted file mode 100644
index 680e94ec91e..00000000000
--- a/sys/compat/linux/linux_getcwd.c
+++ /dev/null
@@ -1,542 +0,0 @@
-/* $OpenBSD: linux_getcwd.c,v 1.8 2006/04/28 08:34:32 pedro Exp $ */
-/* $NetBSD: vfs_getcwd.c,v 1.3.2.3 1999/07/11 10:24:09 sommerfeld Exp $ */
-
-/*-
- * Copyright (c) 1999 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software contributed to The NetBSD Foundation
- * by Bill Sommerfeld.
- *
- * 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 NetBSD
- * Foundation, Inc. and its contributors.
- * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
- */
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/namei.h>
-#include <sys/filedesc.h>
-#include <sys/kernel.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <sys/vnode.h>
-#include <sys/mount.h>
-#include <sys/proc.h>
-#include <sys/uio.h>
-#include <sys/malloc.h>
-#include <sys/dirent.h>
-#include <ufs/ufs/dir.h> /* XXX only for DIRBLKSIZ */
-
-#include <sys/syscallargs.h>
-
-#include <compat/linux/linux_types.h>
-#include <compat/linux/linux_signal.h>
-#include <compat/linux/linux_syscallargs.h>
-#include <compat/linux/linux_util.h>
-#include <compat/linux/linux_dirent.h>
-
-#include <machine/linux_machdep.h>
-
-static int
-linux_getcwd_scandir(struct vnode **, struct vnode **,
- char **, char *, struct proc *);
-static int
-linux_getcwd_getcache(struct vnode **, struct vnode **,
- char **, char *);
-static int
-linux_getcwd_common(struct vnode *, struct vnode *,
- char **, char *, int, int, struct proc *);
-
-#define DIRENT_MINSIZE (sizeof(struct dirent) - (LINUX_MAXNAMLEN+1) + 4)
-
-/*
- * Vnode variable naming conventions in this file:
- *
- * rvp: the current root we're aiming towards.
- * lvp, *lvpp: the "lower" vnode
- * uvp, *uvpp: the "upper" vnode.
- *
- * Since all the vnodes we're dealing with are directories, and the
- * lookups are going *up* in the filesystem rather than *down*, the
- * usual "pvp" (parent) or "dvp" (directory) naming conventions are
- * too confusing.
- */
-
-/*
- * XXX Will infinite loop in certain cases if a directory read reliably
- * returns EINVAL on last block.
- * XXX is EINVAL the right thing to return if a directory is malformed?
- */
-
-/*
- * XXX Untested vs. mount -o union; probably does the wrong thing.
- */
-
-/*
- * Find parent vnode of *lvpp, return in *uvpp
- *
- * If we care about the name, scan it looking for name of directory
- * entry pointing at lvp.
- *
- * Place the name in the buffer which starts at bufp, immediately
- * before *bpp, and move bpp backwards to point at the start of it.
- *
- * On entry, *lvpp is a locked vnode reference; on exit, it is vput and NULL'ed
- * On exit, *uvpp is either NULL or is a locked vnode reference.
- */
-static int
-linux_getcwd_scandir(lvpp, uvpp, bpp, bufp, p)
- struct vnode **lvpp;
- struct vnode **uvpp;
- char **bpp;
- char *bufp;
- struct proc *p;
-{
- int error = 0;
- int eofflag;
- off_t off;
- int tries;
- struct uio uio;
- struct iovec iov;
- char *dirbuf = NULL;
- int dirbuflen;
- ino_t fileno;
- struct vattr va;
- struct vnode *uvp = NULL;
- struct vnode *lvp = *lvpp;
- struct componentname cn;
- int len, reclen;
- tries = 0;
-
- /*
- * If we want the filename, get some info we need while the
- * current directory is still locked.
- */
- if (bufp != NULL) {
- error = VOP_GETATTR(lvp, &va, p->p_ucred, p);
- if (error) {
- vput(lvp);
- *lvpp = NULL;
- *uvpp = NULL;
- return error;
- }
- }
-
- /*
- * Ok, we have to do it the hard way..
- * Next, get parent vnode using lookup of ..
- */
- cn.cn_nameiop = LOOKUP;
- cn.cn_flags = ISLASTCN | ISDOTDOT | RDONLY;
- cn.cn_proc = p;
- cn.cn_cred = p->p_ucred;
- cn.cn_pnbuf = NULL;
- cn.cn_nameptr = "..";
- cn.cn_namelen = 2;
- cn.cn_hash = 0;
- cn.cn_consume = 0;
-
- /*
- * At this point, lvp is locked and will be unlocked by the lookup.
- * On successful return, *uvpp will be locked
- */
- error = VOP_LOOKUP(lvp, uvpp, &cn);
- if (error) {
- vput(lvp);
- *lvpp = NULL;
- *uvpp = NULL;
- return error;
- }
- uvp = *uvpp;
-
- /* If we don't care about the pathname, we're done */
- if (bufp == NULL) {
- vrele(lvp);
- *lvpp = NULL;
- return 0;
- }
-
- fileno = va.va_fileid;
-
- dirbuflen = DIRBLKSIZ;
- if (dirbuflen < va.va_blocksize)
- dirbuflen = va.va_blocksize;
- dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
-
-#if 0
-unionread:
-#endif
- off = 0;
- do {
- /* call VOP_READDIR of parent */
- iov.iov_base = dirbuf;
- iov.iov_len = dirbuflen;
-
- uio.uio_iov = &iov;
- uio.uio_iovcnt = 1;
- uio.uio_offset = off;
- uio.uio_resid = dirbuflen;
- uio.uio_segflg = UIO_SYSSPACE;
- uio.uio_rw = UIO_READ;
- uio.uio_procp = p;
-
- eofflag = 0;
-
- error = VOP_READDIR(uvp, &uio, p->p_ucred, &eofflag, 0, 0);
-
- off = uio.uio_offset;
-
- /*
- * Try again if NFS tosses its cookies.
- * XXX this can still loop forever if the directory is busted
- * such that the second or subsequent page of it always
- * returns EINVAL
- */
- if ((error == EINVAL) && (tries < 3)) {
- off = 0;
- tries++;
- continue; /* once more, with feeling */
- }
-
- if (!error) {
- char *cpos;
- struct dirent *dp;
-
- cpos = dirbuf;
- tries = 0;
-
- /* scan directory page looking for matching vnode */
- for (len = (dirbuflen - uio.uio_resid); len > 0; len -= reclen) {
- dp = (struct dirent *) cpos;
- reclen = dp->d_reclen;
-
- /* check for malformed directory.. */
- if (reclen < DIRENT_MINSIZE) {
- error = EINVAL;
- goto out;
- }
- /*
- * XXX should perhaps do VOP_LOOKUP to
- * check that we got back to the right place,
- * but getting the locking games for that
- * right would be heinous.
- */
- if (dp->d_fileno == fileno) {
- char *bp = *bpp;
- bp -= dp->d_namlen;
-
- if (bp <= bufp) {
- error = ERANGE;
- goto out;
- }
- bcopy(dp->d_name, bp, dp->d_namlen);
- error = 0;
- *bpp = bp;
- goto out;
- }
- cpos += reclen;
- }
- }
- } while (!eofflag);
-
- error = ENOENT;
-
-out:
- vrele(lvp);
- *lvpp = NULL;
- free(dirbuf, M_TEMP);
- return error;
-}
-
-/*
- * Look in the vnode-to-name reverse cache to see if
- * we can find things the easy way.
- *
- * XXX vget failure path is untested.
- *
- * On entry, *lvpp is a locked vnode reference.
- * On exit, one of the following is the case:
- * 0) Both *lvpp and *uvpp are NULL and failure is returned.
- * 1) *uvpp is NULL, *lvpp remains locked and -1 is returned (cache miss)
- * 2) *uvpp is a locked vnode reference, *lvpp is vput and NULL'ed
- * and 0 is returned (cache hit)
- */
-
-static int
-linux_getcwd_getcache(lvpp, uvpp, bpp, bufp)
- struct vnode **lvpp, **uvpp;
- char **bpp;
- char *bufp;
-{
-#ifdef notyet
- struct vnode *lvp, *uvp = NULL;
- int error;
- int vpid;
-
- lvp = *lvpp;
-
- /*
- * This returns 0 on a cache hit, -1 on a clean cache miss,
- * or an errno on other failure.
- */
- error = cache_revlookup(lvp, uvpp, bpp, bufp);
- if (error) {
- if (error != -1) {
- vput(lvp);
- *lvpp = NULL;
- *uvpp = NULL;
- }
- return error;
- }
- uvp = *uvpp;
- vpid = uvp->v_id;
-
- /*
- * Since we're going up, we have to release the current lock
- * before we take the parent lock.
- */
-
- VOP_UNLOCK(lvp, 0);
-
- error = vget(uvp, LK_EXCLUSIVE | LK_RETRY);
- if (error != 0)
- *uvpp = NULL;
- /*
- * Verify that vget succeeded, and check that vnode capability
- * didn't change while we were waiting for the lock.
- */
- if (error || (vpid != uvp->v_id)) {
- /*
- * Oops, we missed. If the vget failed, or the
- * capability changed, try to get our lock back; if
- * that works, tell caller to try things the hard way,
- * otherwise give up.
- */
- if (!error) vput(uvp);
- *uvpp = NULL;
-
- error = vn_lock(lvp, LK_EXCLUSIVE | LK_RETRY);
-
- if (!error)
- return -1;
- }
- vrele(lvp);
- *lvpp = NULL;
- return error;
-#endif /* notyet */
- return (-1);
-}
-
-/*
- * common routine shared by sys___getcwd() and linux_vn_isunder()
- */
-
-#define GETCWD_CHECK_ACCESS 0x0001
-
-static int
-linux_getcwd_common (lvp, rvp, bpp, bufp, limit, flags, p)
- struct vnode *lvp;
- struct vnode *rvp;
- char **bpp;
- char *bufp;
- int limit;
- int flags;
- struct proc *p;
-{
- struct filedesc *fdp = p->p_fd;
- struct vnode *uvp = NULL;
- char *bp = NULL;
- int error;
- int perms = VEXEC;
-
- if (rvp == NULL) {
- rvp = fdp->fd_rdir;
- if (rvp == NULL)
- rvp = rootvnode;
- }
-
- VREF(rvp);
- VREF(lvp);
-
- /*
- * Error handling invariant:
- * Before a `goto out':
- * lvp is either NULL, or locked and held.
- * uvp is either NULL, or locked and held.
- */
-
- error = vn_lock(lvp, LK_EXCLUSIVE | LK_RETRY, p);
- if (error) {
- vrele(lvp);
- lvp = NULL;
- goto out;
- }
- if (bufp)
- bp = *bpp;
- /*
- * this loop will terminate when one of the following happens:
- * - we hit the root
- * - getdirentries or lookup fails
- * - we run out of space in the buffer.
- */
- if (lvp == rvp) {
- if (bp)
- *(--bp) = '/';
- goto out;
- }
- do {
- if (lvp->v_type != VDIR) {
- error = ENOTDIR;
- goto out;
- }
-
- /*
- * access check here is optional, depending on
- * whether or not caller cares.
- */
- if (flags & GETCWD_CHECK_ACCESS) {
- error = VOP_ACCESS(lvp, perms, p->p_ucred, p);
- if (error)
- goto out;
- perms = VEXEC|VREAD;
- }
-
- /*
- * step up if we're a covered vnode..
- */
- while (lvp->v_flag & VROOT) {
- struct vnode *tvp;
-
- if (lvp == rvp)
- goto out;
-
- tvp = lvp;
- lvp = lvp->v_mount->mnt_vnodecovered;
- vput(tvp);
- /*
- * hodie natus est radici frater
- */
- if (lvp == NULL) {
- error = ENOENT;
- goto out;
- }
- VREF(lvp);
- error = vn_lock(lvp, LK_EXCLUSIVE | LK_RETRY, p);
- if (error != 0) {
- vrele(lvp);
- lvp = NULL;
- goto out;
- }
- }
- /*
- * Look in the name cache; if that fails, look in the
- * directory..
- */
- error = linux_getcwd_getcache(&lvp, &uvp, &bp, bufp);
- if (error == -1)
- error = linux_getcwd_scandir(&lvp, &uvp, &bp, bufp, p);
- if (error)
- goto out;
-#ifdef DIAGNOSTIC
- if (lvp != NULL)
- panic("getcwd: oops, forgot to null lvp");
- if (bufp && (bp <= bufp)) {
- panic("getcwd: oops, went back too far");
- }
-#endif
- if (bp)
- *(--bp) = '/';
- lvp = uvp;
- uvp = NULL;
- limit--;
- } while ((lvp != rvp) && (limit > 0));
-
-out:
- if (bpp)
- *bpp = bp;
- if (uvp)
- vput(uvp);
- if (lvp)
- vput(lvp);
- vrele(rvp);
- return error;
-}
-
-/*
- * Find pathname of process's current directory.
- *
- * Use vfs vnode-to-name reverse cache; if that fails, fall back
- * to reading directory contents.
- */
-
-int linux_sys_getcwd(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
-{
- register struct linux_sys_getcwd_args /* {
- syscallarg(char *) bufp;
- syscallarg(size_t) length;
- } */ *uap = v;
-
- int error;
- char *path;
- char *bp, *bend;
- int len = SCARG(uap, length);
- int lenused;
-
- if (len > MAXPATHLEN*4)
- len = MAXPATHLEN*4;
- else if (len < 2)
- return ERANGE;
-
- path = (char *)malloc(len, M_TEMP, M_WAITOK);
-
- bp = &path[len];
- bend = bp;
- *(--bp) = '\0';
-
- /*
- * 5th argument here is "max number of vnodes to traverse".
- * Since each entry takes up at least 2 bytes in the output buffer,
- * limit it to N/2 vnodes for an N byte buffer.
- */
- error = linux_getcwd_common (p->p_fd->fd_cdir, NULL, &bp, path, len/2,
- GETCWD_CHECK_ACCESS, p);
-
- if (error)
- goto out;
- lenused = bend - bp;
- *retval = lenused;
- /* put the result into user buffer */
- error = copyout(bp, SCARG(uap, bufp), lenused);
-
-out:
- free(path, M_TEMP);
- return error;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-15 04:50:28 +0000