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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/inttypes.h>
#include <sys/sysmacros.h>
#include <sys/cred.h>
#include <sys/dirent.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/mode.h>
#include <sys/uio.h>
#include <sys/filio.h>
#include <sys/debug.h>
#include <sys/kmem.h>
#include <sys/cmn_err.h>
#if defined(_SYSCALL32_IMPL) || defined(_ILP32)
/*
* Get directory entries in a file system-independent format.
*
* The 32-bit version of this function now allocates a buffer to grab the
* directory entries in dirent64 formats from VOP_READDIR routines.
* The dirent64 structures are converted to dirent32 structures and
* copied to the user space.
*
* Both 32-bit and 64-bit versions of libc use getdents64() and therefore
* we don't expect any major performance impact due to the extra kmem_alloc's
* and copying done in this routine.
*/
#define MAXGETDENTS_SIZE (64 * 1024)
/*
* Native 32-bit system call for non-large-file applications.
*/
int
getdents32(int fd, void *buf, size_t count)
{
vnode_t *vp;
file_t *fp;
struct uio auio;
struct iovec aiov;
register int error;
int sink;
char *newbuf;
char *obuf;
int bufsize;
int osize, nsize;
struct dirent64 *dp;
struct dirent32 *op;
if (count < sizeof (struct dirent32))
return (set_errno(EINVAL));
if ((fp = getf(fd)) == NULL)
return (set_errno(EBADF));
vp = fp->f_vnode;
if (vp->v_type != VDIR) {
releasef(fd);
return (set_errno(ENOTDIR));
}
/*
* Don't let the user overcommit kernel resources.
*/
if (count > MAXGETDENTS_SIZE)
count = MAXGETDENTS_SIZE;
bufsize = count;
newbuf = kmem_alloc(bufsize, KM_SLEEP);
obuf = kmem_alloc(bufsize, KM_SLEEP);
aiov.iov_base = newbuf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_loffset = fp->f_offset;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_resid = count;
auio.uio_fmode = 0;
auio.uio_extflg = UIO_COPY_CACHED;
(void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL);
error = VOP_READDIR(vp, &auio, fp->f_cred, &sink);
VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL);
if (error)
goto out;
count = count - auio.uio_resid;
fp->f_offset = auio.uio_loffset;
dp = (struct dirent64 *)newbuf;
op = (struct dirent32 *)obuf;
osize = 0;
nsize = 0;
while (nsize < count) {
uint32_t reclen, namlen;
/*
* This check ensures that the 64 bit d_ino and d_off
* fields will fit into their 32 bit equivalents.
*
* Although d_off is a signed value, the check is done
* against the full 32 bits because certain file systems,
* NFS for one, allow directory cookies to use the full
* 32 bits. We use uint64_t because there is no exact
* unsigned analog to the off64_t type of dp->d_off.
*/
if (dp->d_ino > (ino64_t)UINT32_MAX ||
dp->d_off > (uint64_t)UINT32_MAX) {
error = EOVERFLOW;
goto out;
}
op->d_ino = (ino32_t)dp->d_ino;
op->d_off = (off32_t)dp->d_off;
namlen = strlen(dp->d_name);
reclen = DIRENT32_RECLEN(namlen);
op->d_reclen = (uint16_t)reclen;
/* use strncpy(9f) to zero out uninitialized bytes */
(void) strncpy(op->d_name, dp->d_name,
DIRENT32_NAMELEN(reclen));
nsize += (uint_t)dp->d_reclen;
osize += (uint_t)op->d_reclen;
dp = (struct dirent64 *)((char *)dp + (uint_t)dp->d_reclen);
op = (struct dirent32 *)((char *)op + (uint_t)op->d_reclen);
}
ASSERT(osize <= count);
ASSERT((char *)op <= (char *)obuf + bufsize);
ASSERT((char *)dp <= (char *)newbuf + bufsize);
if ((error = copyout(obuf, buf, osize)) < 0)
error = EFAULT;
out:
kmem_free(newbuf, bufsize);
kmem_free(obuf, bufsize);
if (error) {
releasef(fd);
return (set_errno(error));
}
releasef(fd);
return (osize);
}
#endif /* _SYSCALL32 || _ILP32 */
int
getdents64(int fd, void *buf, size_t count)
{
vnode_t *vp;
file_t *fp;
struct uio auio;
struct iovec aiov;
register int error;
int sink;
if (count < sizeof (struct dirent64))
return (set_errno(EINVAL));
/*
* Don't let the user overcommit kernel resources.
*/
if (count > MAXGETDENTS_SIZE)
count = MAXGETDENTS_SIZE;
if ((fp = getf(fd)) == NULL)
return (set_errno(EBADF));
vp = fp->f_vnode;
if (vp->v_type != VDIR) {
releasef(fd);
return (set_errno(ENOTDIR));
}
aiov.iov_base = buf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_loffset = fp->f_offset;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_resid = count;
auio.uio_fmode = 0;
auio.uio_extflg = UIO_COPY_CACHED;
(void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL);
error = VOP_READDIR(vp, &auio, fp->f_cred, &sink);
VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL);
if (error) {
releasef(fd);
return (set_errno(error));
}
count = count - auio.uio_resid;
fp->f_offset = auio.uio_loffset;
releasef(fd);
return (count);
}
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