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freebsd-skq/sys/compat/linux/linux_file.c
mckusick 0cddeb2cb4 Background: 
When renaming a directory it passes through several intermediate
states. First its new name will be created causing it to have two
names (from possibly different parents). Next, if it has different
parents, its value of ".." will be changed from pointing to the old
parent to pointing to the new parent. Concurrently, its old name
will be removed bringing it back into a consistent state. When fsck
encounters an extra name for a directory, it offers to remove the
"extraneous hard link"; when it finds that the names have been
changed but the update to ".." has not happened, it offers to rewrite
".." to point at the correct parent. Both of these changes were
considered unexpected so would cause fsck in preen mode or fsck in
background mode to fail with the need to run fsck manually to fix
these problems. Fsck running in preen mode or background mode now
corrects these expected inconsistencies that arise during directory
rename. The functionality added with this update is used by fsck
running in background mode to make these fixes.

Solution:

This update adds three new fsck sysctl commands to support background
fsck in correcting expected inconsistencies that arise from incomplete
directory rename operations. They are:

setcwd(dirinode) - set the current directory to dirinode in the
    filesystem associated with the snapshot.
setdotdot(oldvalue, newvalue) - Verify that the inode number for ".."
    in the current directory is oldvalue then change it to newvalue.
unlink(nameptr, oldvalue) - Verify that the inode number associated
    with nameptr in the current directory is oldvalue then unlink it.

As with all other fsck sysctls, these new ones may only be used by
processes with appropriate priviledge.

Reported by:    	jeff
Security issues:	rwatson
2010-01-11 20:44:05 +00:00

1535 lines
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/*-
* Copyright (c) 1994-1995 Søren Schmidt
* 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
* in this position and unchanged.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/sx.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/tty.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <security/mac/mac_framework.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_file.h>
int
linux_creat(struct thread *td, struct linux_creat_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(creat))
printf(ARGS(creat, "%s, %d"), path, args->mode);
#endif
error = kern_open(td, path, UIO_SYSSPACE, O_WRONLY | O_CREAT | O_TRUNC,
args->mode);
LFREEPATH(path);
return (error);
}
static int
linux_common_open(struct thread *td, int dirfd, char *path, int l_flags, int mode)
{
struct proc *p = td->td_proc;
struct file *fp;
int fd;
int bsd_flags, error;
bsd_flags = 0;
switch (l_flags & LINUX_O_ACCMODE) {
case LINUX_O_WRONLY:
bsd_flags |= O_WRONLY;
break;
case LINUX_O_RDWR:
bsd_flags |= O_RDWR;
break;
default:
bsd_flags |= O_RDONLY;
}
if (l_flags & LINUX_O_NDELAY)
bsd_flags |= O_NONBLOCK;
if (l_flags & LINUX_O_APPEND)
bsd_flags |= O_APPEND;
if (l_flags & LINUX_O_SYNC)
bsd_flags |= O_FSYNC;
if (l_flags & LINUX_O_NONBLOCK)
bsd_flags |= O_NONBLOCK;
if (l_flags & LINUX_FASYNC)
bsd_flags |= O_ASYNC;
if (l_flags & LINUX_O_CREAT)
bsd_flags |= O_CREAT;
if (l_flags & LINUX_O_TRUNC)
bsd_flags |= O_TRUNC;
if (l_flags & LINUX_O_EXCL)
bsd_flags |= O_EXCL;
if (l_flags & LINUX_O_NOCTTY)
bsd_flags |= O_NOCTTY;
if (l_flags & LINUX_O_DIRECT)
bsd_flags |= O_DIRECT;
if (l_flags & LINUX_O_NOFOLLOW)
bsd_flags |= O_NOFOLLOW;
/* XXX LINUX_O_NOATIME: unable to be easily implemented. */
error = kern_openat(td, dirfd, path, UIO_SYSSPACE, bsd_flags, mode);
if (!error) {
fd = td->td_retval[0];
/*
* XXX In between kern_open() and fget(), another process
* having the same filedesc could use that fd without
* checking below.
*/
error = fget(td, fd, &fp);
if (!error) {
sx_slock(&proctree_lock);
PROC_LOCK(p);
if (!(bsd_flags & O_NOCTTY) &&
SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
PROC_UNLOCK(p);
sx_unlock(&proctree_lock);
if (fp->f_type == DTYPE_VNODE)
(void) fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0,
td->td_ucred, td);
} else {
PROC_UNLOCK(p);
sx_sunlock(&proctree_lock);
}
if (l_flags & LINUX_O_DIRECTORY) {
if (fp->f_type != DTYPE_VNODE ||
fp->f_vnode->v_type != VDIR) {
error = ENOTDIR;
}
}
fdrop(fp, td);
/*
* XXX as above, fdrop()/kern_close() pair is racy.
*/
if (error)
kern_close(td, fd);
}
}
#ifdef DEBUG
if (ldebug(open))
printf(LMSG("open returns error %d"), error);
#endif
LFREEPATH(path);
return (error);
}
int
linux_openat(struct thread *td, struct linux_openat_args *args)
{
char *path;
int dfd;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
if (args->flags & LINUX_O_CREAT)
LCONVPATH_AT(td, args->filename, &path, 1, dfd);
else
LCONVPATH_AT(td, args->filename, &path, 0, dfd);
#ifdef DEBUG
if (ldebug(openat))
printf(ARGS(openat, "%i, %s, 0x%x, 0x%x"), args->dfd,
path, args->flags, args->mode);
#endif
return (linux_common_open(td, dfd, path, args->flags, args->mode));
}
int
linux_open(struct thread *td, struct linux_open_args *args)
{
char *path;
if (args->flags & LINUX_O_CREAT)
LCONVPATHCREAT(td, args->path, &path);
else
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(open))
printf(ARGS(open, "%s, 0x%x, 0x%x"),
path, args->flags, args->mode);
#endif
return (linux_common_open(td, AT_FDCWD, path, args->flags, args->mode));
}
int
linux_lseek(struct thread *td, struct linux_lseek_args *args)
{
struct lseek_args /* {
int fd;
int pad;
off_t offset;
int whence;
} */ tmp_args;
int error;
#ifdef DEBUG
if (ldebug(lseek))
printf(ARGS(lseek, "%d, %ld, %d"),
args->fdes, (long)args->off, args->whence);
#endif
tmp_args.fd = args->fdes;
tmp_args.offset = (off_t)args->off;
tmp_args.whence = args->whence;
error = lseek(td, &tmp_args);
return error;
}
int
linux_llseek(struct thread *td, struct linux_llseek_args *args)
{
struct lseek_args bsd_args;
int error;
off_t off;
#ifdef DEBUG
if (ldebug(llseek))
printf(ARGS(llseek, "%d, %d:%d, %d"),
args->fd, args->ohigh, args->olow, args->whence);
#endif
off = (args->olow) | (((off_t) args->ohigh) << 32);
bsd_args.fd = args->fd;
bsd_args.offset = off;
bsd_args.whence = args->whence;
if ((error = lseek(td, &bsd_args)))
return error;
if ((error = copyout(td->td_retval, args->res, sizeof (off_t))))
return error;
td->td_retval[0] = 0;
return 0;
}
int
linux_readdir(struct thread *td, struct linux_readdir_args *args)
{
struct linux_getdents_args lda;
lda.fd = args->fd;
lda.dent = args->dent;
lda.count = 1;
return linux_getdents(td, &lda);
}
/*
* Note that linux_getdents(2) and linux_getdents64(2) have the same
* arguments. They only differ in the definition of struct dirent they
* operate on. We use this to common the code, with the exception of
* accessing struct dirent. Note that linux_readdir(2) is implemented
* by means of linux_getdents(2). In this case we never operate on
* struct dirent64 and thus don't need to handle it...
*/
struct l_dirent {
l_ulong d_ino;
l_off_t d_off;
l_ushort d_reclen;
char d_name[LINUX_NAME_MAX + 1];
};
struct l_dirent64 {
uint64_t d_ino;
int64_t d_off;
l_ushort d_reclen;
u_char d_type;
char d_name[LINUX_NAME_MAX + 1];
};
/*
* Linux uses the last byte in the dirent buffer to store d_type,
* at least glibc-2.7 requires it. That is why l_dirent is padded with 2 bytes.
*/
#define LINUX_RECLEN(namlen) \
roundup((offsetof(struct l_dirent, d_name) + (namlen) + 2), \
sizeof(l_ulong))
#define LINUX_RECLEN64(namlen) \
roundup((offsetof(struct l_dirent64, d_name) + (namlen) + 1), \
sizeof(uint64_t))
#define LINUX_MAXRECLEN max(LINUX_RECLEN(LINUX_NAME_MAX), \
LINUX_RECLEN64(LINUX_NAME_MAX))
#define LINUX_DIRBLKSIZ 512
static int
getdents_common(struct thread *td, struct linux_getdents64_args *args,
int is64bit)
{
struct dirent *bdp;
struct vnode *vp;
caddr_t inp, buf; /* BSD-format */
int len, reclen; /* BSD-format */
caddr_t outp; /* Linux-format */
int resid, linuxreclen=0; /* Linux-format */
caddr_t lbuf; /* Linux-format */
struct file *fp;
struct uio auio;
struct iovec aiov;
off_t off;
struct l_dirent *linux_dirent;
struct l_dirent64 *linux_dirent64;
int buflen, error, eofflag, nbytes, justone;
u_long *cookies = NULL, *cookiep;
int ncookies, vfslocked;
nbytes = args->count;
if (nbytes == 1) {
/* readdir(2) case. Always struct dirent. */
if (is64bit)
return (EINVAL);
nbytes = sizeof(*linux_dirent);
justone = 1;
} else
justone = 0;
if ((error = getvnode(td->td_proc->p_fd, args->fd, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
vp = fp->f_vnode;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
if (vp->v_type != VDIR) {
VFS_UNLOCK_GIANT(vfslocked);
fdrop(fp, td);
return (EINVAL);
}
off = fp->f_offset;
buflen = max(LINUX_DIRBLKSIZ, nbytes);
buflen = min(buflen, MAXBSIZE);
buf = malloc(buflen, M_TEMP, M_WAITOK);
lbuf = malloc(LINUX_MAXRECLEN, M_TEMP, M_WAITOK | M_ZERO);
vn_lock(vp, LK_SHARED | LK_RETRY);
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_td = td;
auio.uio_resid = buflen;
auio.uio_offset = off;
if (cookies) {
free(cookies, M_TEMP);
cookies = NULL;
}
#ifdef MAC
/*
* Do directory search MAC check using non-cached credentials.
*/
if ((error = mac_vnode_check_readdir(td->td_ucred, vp)))
goto out;
#endif /* MAC */
if ((error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &ncookies,
&cookies)))
goto out;
inp = buf;
outp = (caddr_t)args->dirent;
resid = nbytes;
if ((len = buflen - auio.uio_resid) <= 0)
goto eof;
cookiep = cookies;
if (cookies) {
/*
* When using cookies, the vfs has the option of reading from
* a different offset than that supplied (UFS truncates the
* offset to a block boundary to make sure that it never reads
* partway through a directory entry, even if the directory
* has been compacted).
*/
while (len > 0 && ncookies > 0 && *cookiep <= off) {
bdp = (struct dirent *) inp;
len -= bdp->d_reclen;
inp += bdp->d_reclen;
cookiep++;
ncookies--;
}
}
while (len > 0) {
if (cookiep && ncookies == 0)
break;
bdp = (struct dirent *) inp;
reclen = bdp->d_reclen;
if (reclen & 3) {
error = EFAULT;
goto out;
}
if (bdp->d_fileno == 0) {
inp += reclen;
if (cookiep) {
off = *cookiep++;
ncookies--;
} else
off += reclen;
len -= reclen;
continue;
}
linuxreclen = (is64bit)
? LINUX_RECLEN64(bdp->d_namlen)
: LINUX_RECLEN(bdp->d_namlen);
if (reclen > len || resid < linuxreclen) {
outp++;
break;
}
if (justone) {
/* readdir(2) case. */
linux_dirent = (struct l_dirent*)lbuf;
linux_dirent->d_ino = bdp->d_fileno;
linux_dirent->d_off = (l_off_t)linuxreclen;
linux_dirent->d_reclen = (l_ushort)bdp->d_namlen;
strlcpy(linux_dirent->d_name, bdp->d_name,
linuxreclen - offsetof(struct l_dirent, d_name));
error = copyout(linux_dirent, outp, linuxreclen);
}
if (is64bit) {
linux_dirent64 = (struct l_dirent64*)lbuf;
linux_dirent64->d_ino = bdp->d_fileno;
linux_dirent64->d_off = (cookiep)
? (l_off_t)*cookiep
: (l_off_t)(off + reclen);
linux_dirent64->d_reclen = (l_ushort)linuxreclen;
linux_dirent64->d_type = bdp->d_type;
strlcpy(linux_dirent64->d_name, bdp->d_name,
linuxreclen - offsetof(struct l_dirent64, d_name));
error = copyout(linux_dirent64, outp, linuxreclen);
} else if (!justone) {
linux_dirent = (struct l_dirent*)lbuf;
linux_dirent->d_ino = bdp->d_fileno;
linux_dirent->d_off = (cookiep)
? (l_off_t)*cookiep
: (l_off_t)(off + reclen);
linux_dirent->d_reclen = (l_ushort)linuxreclen;
/*
* Copy d_type to last byte of l_dirent buffer
*/
lbuf[linuxreclen-1] = bdp->d_type;
strlcpy(linux_dirent->d_name, bdp->d_name,
linuxreclen - offsetof(struct l_dirent, d_name)-1);
error = copyout(linux_dirent, outp, linuxreclen);
}
if (error)
goto out;
inp += reclen;
if (cookiep) {
off = *cookiep++;
ncookies--;
} else
off += reclen;
outp += linuxreclen;
resid -= linuxreclen;
len -= reclen;
if (justone)
break;
}
if (outp == (caddr_t)args->dirent)
goto again;
fp->f_offset = off;
if (justone)
nbytes = resid + linuxreclen;
eof:
td->td_retval[0] = nbytes - resid;
out:
if (cookies)
free(cookies, M_TEMP);
VOP_UNLOCK(vp, 0);
VFS_UNLOCK_GIANT(vfslocked);
fdrop(fp, td);
free(buf, M_TEMP);
free(lbuf, M_TEMP);
return (error);
}
int
linux_getdents(struct thread *td, struct linux_getdents_args *args)
{
#ifdef DEBUG
if (ldebug(getdents))
printf(ARGS(getdents, "%d, *, %d"), args->fd, args->count);
#endif
return (getdents_common(td, (struct linux_getdents64_args*)args, 0));
}
int
linux_getdents64(struct thread *td, struct linux_getdents64_args *args)
{
#ifdef DEBUG
if (ldebug(getdents64))
printf(ARGS(getdents64, "%d, *, %d"), args->fd, args->count);
#endif
return (getdents_common(td, args, 1));
}
/*
* These exist mainly for hooks for doing /compat/linux translation.
*/
int
linux_access(struct thread *td, struct linux_access_args *args)
{
char *path;
int error;
/* linux convention */
if (args->flags & ~(F_OK | X_OK | W_OK | R_OK))
return (EINVAL);
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(access))
printf(ARGS(access, "%s, %d"), path, args->flags);
#endif
error = kern_access(td, path, UIO_SYSSPACE, args->flags);
LFREEPATH(path);
return (error);
}
int
linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
{
char *path;
int error, dfd;
/* linux convention */
if (args->mode & ~(F_OK | X_OK | W_OK | R_OK))
return (EINVAL);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
#ifdef DEBUG
if (ldebug(access))
printf(ARGS(access, "%s, %d"), path, args->mode);
#endif
error = kern_accessat(td, dfd, path, UIO_SYSSPACE, 0 /* XXX */,
args->mode);
LFREEPATH(path);
return (error);
}
int
linux_unlink(struct thread *td, struct linux_unlink_args *args)
{
char *path;
int error;
struct stat st;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(unlink))
printf(ARGS(unlink, "%s"), path);
#endif
error = kern_unlink(td, path, UIO_SYSSPACE);
if (error == EPERM)
/* Introduce POSIX noncompliant behaviour of Linux */
if (kern_stat(td, path, UIO_SYSSPACE, &st) == 0)
if (S_ISDIR(st.st_mode))
error = EISDIR;
LFREEPATH(path);
return (error);
}
int
linux_unlinkat(struct thread *td, struct linux_unlinkat_args *args)
{
char *path;
int error, dfd;
struct stat st;
if (args->flag & ~LINUX_AT_REMOVEDIR)
return (EINVAL);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
#ifdef DEBUG
if (ldebug(unlinkat))
printf(ARGS(unlinkat, "%s"), path);
#endif
if (args->flag & LINUX_AT_REMOVEDIR)
error = kern_rmdirat(td, dfd, path, UIO_SYSSPACE);
else
error = kern_unlinkat(td, dfd, path, UIO_SYSSPACE, 0);
if (error == EPERM && !(args->flag & LINUX_AT_REMOVEDIR)) {
/* Introduce POSIX noncompliant behaviour of Linux */
if (kern_statat(td, AT_SYMLINK_NOFOLLOW, dfd, path,
UIO_SYSSPACE, &st) == 0 && S_ISDIR(st.st_mode))
error = EISDIR;
}
LFREEPATH(path);
return (error);
}
int
linux_chdir(struct thread *td, struct linux_chdir_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(chdir))
printf(ARGS(chdir, "%s"), path);
#endif
error = kern_chdir(td, path, UIO_SYSSPACE);
LFREEPATH(path);
return (error);
}
int
linux_chmod(struct thread *td, struct linux_chmod_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(chmod))
printf(ARGS(chmod, "%s, %d"), path, args->mode);
#endif
error = kern_chmod(td, path, UIO_SYSSPACE, args->mode);
LFREEPATH(path);
return (error);
}
int
linux_fchmodat(struct thread *td, struct linux_fchmodat_args *args)
{
char *path;
int error, dfd;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
#ifdef DEBUG
if (ldebug(fchmodat))
printf(ARGS(fchmodat, "%s, %d"), path, args->mode);
#endif
error = kern_fchmodat(td, dfd, path, UIO_SYSSPACE, args->mode, 0);
LFREEPATH(path);
return (error);
}
int
linux_mkdir(struct thread *td, struct linux_mkdir_args *args)
{
char *path;
int error;
LCONVPATHCREAT(td, args->path, &path);
#ifdef DEBUG
if (ldebug(mkdir))
printf(ARGS(mkdir, "%s, %d"), path, args->mode);
#endif
error = kern_mkdir(td, path, UIO_SYSSPACE, args->mode);
LFREEPATH(path);
return (error);
}
int
linux_mkdirat(struct thread *td, struct linux_mkdirat_args *args)
{
char *path;
int error, dfd;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHCREAT_AT(td, args->pathname, &path, dfd);
#ifdef DEBUG
if (ldebug(mkdirat))
printf(ARGS(mkdirat, "%s, %d"), path, args->mode);
#endif
error = kern_mkdirat(td, dfd, path, UIO_SYSSPACE, args->mode);
LFREEPATH(path);
return (error);
}
int
linux_rmdir(struct thread *td, struct linux_rmdir_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(rmdir))
printf(ARGS(rmdir, "%s"), path);
#endif
error = kern_rmdir(td, path, UIO_SYSSPACE);
LFREEPATH(path);
return (error);
}
int
linux_rename(struct thread *td, struct linux_rename_args *args)
{
char *from, *to;
int error;
LCONVPATHEXIST(td, args->from, &from);
/* Expand LCONVPATHCREATE so that `from' can be freed on errors */
error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
if (to == NULL) {
LFREEPATH(from);
return (error);
}
#ifdef DEBUG
if (ldebug(rename))
printf(ARGS(rename, "%s, %s"), from, to);
#endif
error = kern_rename(td, from, to, UIO_SYSSPACE);
LFREEPATH(from);
LFREEPATH(to);
return (error);
}
int
linux_renameat(struct thread *td, struct linux_renameat_args *args)
{
char *from, *to;
int error, olddfd, newdfd;
olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
LCONVPATHEXIST_AT(td, args->oldname, &from, olddfd);
/* Expand LCONVPATHCREATE so that `from' can be freed on errors */
error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, newdfd);
if (to == NULL) {
LFREEPATH(from);
return (error);
}
#ifdef DEBUG
if (ldebug(renameat))
printf(ARGS(renameat, "%s, %s"), from, to);
#endif
error = kern_renameat(td, olddfd, from, newdfd, to, UIO_SYSSPACE);
LFREEPATH(from);
LFREEPATH(to);
return (error);
}
int
linux_symlink(struct thread *td, struct linux_symlink_args *args)
{
char *path, *to;
int error;
LCONVPATHEXIST(td, args->path, &path);
/* Expand LCONVPATHCREATE so that `path' can be freed on errors */
error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
if (to == NULL) {
LFREEPATH(path);
return (error);
}
#ifdef DEBUG
if (ldebug(symlink))
printf(ARGS(symlink, "%s, %s"), path, to);
#endif
error = kern_symlink(td, path, to, UIO_SYSSPACE);
LFREEPATH(path);
LFREEPATH(to);
return (error);
}
int
linux_symlinkat(struct thread *td, struct linux_symlinkat_args *args)
{
char *path, *to;
int error, dfd;
dfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
LCONVPATHEXIST_AT(td, args->oldname, &path, dfd);
/* Expand LCONVPATHCREATE so that `path' can be freed on errors */
error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, dfd);
if (to == NULL) {
LFREEPATH(path);
return (error);
}
#ifdef DEBUG
if (ldebug(symlinkat))
printf(ARGS(symlinkat, "%s, %s"), path, to);
#endif
error = kern_symlinkat(td, path, dfd, to, UIO_SYSSPACE);
LFREEPATH(path);
LFREEPATH(to);
return (error);
}
int
linux_readlink(struct thread *td, struct linux_readlink_args *args)
{
char *name;
int error;
LCONVPATHEXIST(td, args->name, &name);
#ifdef DEBUG
if (ldebug(readlink))
printf(ARGS(readlink, "%s, %p, %d"), name, (void *)args->buf,
args->count);
#endif
error = kern_readlink(td, name, UIO_SYSSPACE, args->buf, UIO_USERSPACE,
args->count);
LFREEPATH(name);
return (error);
}
int
linux_readlinkat(struct thread *td, struct linux_readlinkat_args *args)
{
char *name;
int error, dfd;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->path, &name, dfd);
#ifdef DEBUG
if (ldebug(readlinkat))
printf(ARGS(readlinkat, "%s, %p, %d"), name, (void *)args->buf,
args->bufsiz);
#endif
error = kern_readlinkat(td, dfd, name, UIO_SYSSPACE, args->buf,
UIO_USERSPACE, args->bufsiz);
LFREEPATH(name);
return (error);
}
int
linux_truncate(struct thread *td, struct linux_truncate_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(truncate))
printf(ARGS(truncate, "%s, %ld"), path, (long)args->length);
#endif
error = kern_truncate(td, path, UIO_SYSSPACE, args->length);
LFREEPATH(path);
return (error);
}
int
linux_truncate64(struct thread *td, struct linux_truncate64_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(truncate64))
printf(ARGS(truncate64, "%s, %jd"), path, args->length);
#endif
error = kern_truncate(td, path, UIO_SYSSPACE, args->length);
LFREEPATH(path);
return (error);
}
int
linux_ftruncate(struct thread *td, struct linux_ftruncate_args *args)
{
struct ftruncate_args /* {
int fd;
int pad;
off_t length;
} */ nuap;
nuap.fd = args->fd;
nuap.length = args->length;
return (ftruncate(td, &nuap));
}
int
linux_link(struct thread *td, struct linux_link_args *args)
{
char *path, *to;
int error;
LCONVPATHEXIST(td, args->path, &path);
/* Expand LCONVPATHCREATE so that `path' can be freed on errors */
error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
if (to == NULL) {
LFREEPATH(path);
return (error);
}
#ifdef DEBUG
if (ldebug(link))
printf(ARGS(link, "%s, %s"), path, to);
#endif
error = kern_link(td, path, to, UIO_SYSSPACE);
LFREEPATH(path);
LFREEPATH(to);
return (error);
}
int
linux_linkat(struct thread *td, struct linux_linkat_args *args)
{
char *path, *to;
int error, olddfd, newdfd;
/*
* They really introduced flags argument which is forbidden to
* use.
*/
if (args->flags != 0)
return (EINVAL);
olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
LCONVPATHEXIST_AT(td, args->oldname, &path, olddfd);
/* Expand LCONVPATHCREATE so that `path' can be freed on errors */
error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, newdfd);
if (to == NULL) {
LFREEPATH(path);
return (error);
}
#ifdef DEBUG
if (ldebug(linkat))
printf(ARGS(linkat, "%i, %s, %i, %s, %i"), args->olddfd, path,
args->newdfd, to, args->flags);
#endif
error = kern_linkat(td, olddfd, newdfd, path, to, UIO_SYSSPACE, FOLLOW);
LFREEPATH(path);
LFREEPATH(to);
return (error);
}
int
linux_fdatasync(td, uap)
struct thread *td;
struct linux_fdatasync_args *uap;
{
struct fsync_args bsd;
bsd.fd = uap->fd;
return fsync(td, &bsd);
}
int
linux_pread(td, uap)
struct thread *td;
struct linux_pread_args *uap;
{
struct pread_args bsd;
struct vnode *vp;
int error;
bsd.fd = uap->fd;
bsd.buf = uap->buf;
bsd.nbyte = uap->nbyte;
bsd.offset = uap->offset;
error = pread(td, &bsd);
if (error == 0) {
/* This seems to violate POSIX but linux does it */
if ((error = fgetvp(td, uap->fd, &vp)) != 0)
return (error);
if (vp->v_type == VDIR) {
vrele(vp);
return (EISDIR);
}
vrele(vp);
}
return (error);
}
int
linux_pwrite(td, uap)
struct thread *td;
struct linux_pwrite_args *uap;
{
struct pwrite_args bsd;
bsd.fd = uap->fd;
bsd.buf = uap->buf;
bsd.nbyte = uap->nbyte;
bsd.offset = uap->offset;
return pwrite(td, &bsd);
}
int
linux_mount(struct thread *td, struct linux_mount_args *args)
{
struct ufs_args ufs;
char fstypename[MFSNAMELEN];
char mntonname[MNAMELEN], mntfromname[MNAMELEN];
int error;
int fsflags;
void *fsdata;
error = copyinstr(args->filesystemtype, fstypename, MFSNAMELEN - 1,
NULL);
if (error)
return (error);
error = copyinstr(args->specialfile, mntfromname, MNAMELEN - 1, NULL);
if (error)
return (error);
error = copyinstr(args->dir, mntonname, MNAMELEN - 1, NULL);
if (error)
return (error);
#ifdef DEBUG
if (ldebug(mount))
printf(ARGS(mount, "%s, %s, %s"),
fstypename, mntfromname, mntonname);
#endif
if (strcmp(fstypename, "ext2") == 0) {
strcpy(fstypename, "ext2fs");
fsdata = &ufs;
ufs.fspec = mntfromname;
#define DEFAULT_ROOTID -2
ufs.export.ex_root = DEFAULT_ROOTID;
ufs.export.ex_flags =
args->rwflag & LINUX_MS_RDONLY ? MNT_EXRDONLY : 0;
} else if (strcmp(fstypename, "proc") == 0) {
strcpy(fstypename, "linprocfs");
fsdata = NULL;
} else if (strcmp(fstypename, "vfat") == 0) {
strcpy(fstypename, "msdosfs");
fsdata = NULL;
} else {
return (ENODEV);
}
fsflags = 0;
if ((args->rwflag & 0xffff0000) == 0xc0ed0000) {
/*
* Linux SYNC flag is not included; the closest equivalent
* FreeBSD has is !ASYNC, which is our default.
*/
if (args->rwflag & LINUX_MS_RDONLY)
fsflags |= MNT_RDONLY;
if (args->rwflag & LINUX_MS_NOSUID)
fsflags |= MNT_NOSUID;
if (args->rwflag & LINUX_MS_NOEXEC)
fsflags |= MNT_NOEXEC;
if (args->rwflag & LINUX_MS_REMOUNT)
fsflags |= MNT_UPDATE;
}
if (strcmp(fstypename, "linprocfs") == 0) {
error = kernel_vmount(fsflags,
"fstype", fstypename,
"fspath", mntonname,
NULL);
} else if (strcmp(fstypename, "msdosfs") == 0) {
error = kernel_vmount(fsflags,
"fstype", fstypename,
"fspath", mntonname,
"from", mntfromname,
NULL);
} else
error = EOPNOTSUPP;
return (error);
}
int
linux_oldumount(struct thread *td, struct linux_oldumount_args *args)
{
struct linux_umount_args args2;
args2.path = args->path;
args2.flags = 0;
return (linux_umount(td, &args2));
}
int
linux_umount(struct thread *td, struct linux_umount_args *args)
{
struct unmount_args bsd;
bsd.path = args->path;
bsd.flags = args->flags; /* XXX correct? */
return (unmount(td, &bsd));
}
/*
* fcntl family of syscalls
*/
struct l_flock {
l_short l_type;
l_short l_whence;
l_off_t l_start;
l_off_t l_len;
l_pid_t l_pid;
}
#if defined(__amd64__) && defined(COMPAT_LINUX32)
__packed
#endif
;
static void
linux_to_bsd_flock(struct l_flock *linux_flock, struct flock *bsd_flock)
{
switch (linux_flock->l_type) {
case LINUX_F_RDLCK:
bsd_flock->l_type = F_RDLCK;
break;
case LINUX_F_WRLCK:
bsd_flock->l_type = F_WRLCK;
break;
case LINUX_F_UNLCK:
bsd_flock->l_type = F_UNLCK;
break;
default:
bsd_flock->l_type = -1;
break;
}
bsd_flock->l_whence = linux_flock->l_whence;
bsd_flock->l_start = (off_t)linux_flock->l_start;
bsd_flock->l_len = (off_t)linux_flock->l_len;
bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
bsd_flock->l_sysid = 0;
}
static void
bsd_to_linux_flock(struct flock *bsd_flock, struct l_flock *linux_flock)
{
switch (bsd_flock->l_type) {
case F_RDLCK:
linux_flock->l_type = LINUX_F_RDLCK;
break;
case F_WRLCK:
linux_flock->l_type = LINUX_F_WRLCK;
break;
case F_UNLCK:
linux_flock->l_type = LINUX_F_UNLCK;
break;
}
linux_flock->l_whence = bsd_flock->l_whence;
linux_flock->l_start = (l_off_t)bsd_flock->l_start;
linux_flock->l_len = (l_off_t)bsd_flock->l_len;
linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
}
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
struct l_flock64 {
l_short l_type;
l_short l_whence;
l_loff_t l_start;
l_loff_t l_len;
l_pid_t l_pid;
}
#if defined(__amd64__) && defined(COMPAT_LINUX32)
__packed
#endif
;
static void
linux_to_bsd_flock64(struct l_flock64 *linux_flock, struct flock *bsd_flock)
{
switch (linux_flock->l_type) {
case LINUX_F_RDLCK:
bsd_flock->l_type = F_RDLCK;
break;
case LINUX_F_WRLCK:
bsd_flock->l_type = F_WRLCK;
break;
case LINUX_F_UNLCK:
bsd_flock->l_type = F_UNLCK;
break;
default:
bsd_flock->l_type = -1;
break;
}
bsd_flock->l_whence = linux_flock->l_whence;
bsd_flock->l_start = (off_t)linux_flock->l_start;
bsd_flock->l_len = (off_t)linux_flock->l_len;
bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
bsd_flock->l_sysid = 0;
}
static void
bsd_to_linux_flock64(struct flock *bsd_flock, struct l_flock64 *linux_flock)
{
switch (bsd_flock->l_type) {
case F_RDLCK:
linux_flock->l_type = LINUX_F_RDLCK;
break;
case F_WRLCK:
linux_flock->l_type = LINUX_F_WRLCK;
break;
case F_UNLCK:
linux_flock->l_type = LINUX_F_UNLCK;
break;
}
linux_flock->l_whence = bsd_flock->l_whence;
linux_flock->l_start = (l_loff_t)bsd_flock->l_start;
linux_flock->l_len = (l_loff_t)bsd_flock->l_len;
linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
}
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
static int
fcntl_common(struct thread *td, struct linux_fcntl64_args *args)
{
struct l_flock linux_flock;
struct flock bsd_flock;
struct file *fp;
long arg;
int error, result;
switch (args->cmd) {
case LINUX_F_DUPFD:
return (kern_fcntl(td, args->fd, F_DUPFD, args->arg));
case LINUX_F_GETFD:
return (kern_fcntl(td, args->fd, F_GETFD, 0));
case LINUX_F_SETFD:
return (kern_fcntl(td, args->fd, F_SETFD, args->arg));
case LINUX_F_GETFL:
error = kern_fcntl(td, args->fd, F_GETFL, 0);
result = td->td_retval[0];
td->td_retval[0] = 0;
if (result & O_RDONLY)
td->td_retval[0] |= LINUX_O_RDONLY;
if (result & O_WRONLY)
td->td_retval[0] |= LINUX_O_WRONLY;
if (result & O_RDWR)
td->td_retval[0] |= LINUX_O_RDWR;
if (result & O_NDELAY)
td->td_retval[0] |= LINUX_O_NONBLOCK;
if (result & O_APPEND)
td->td_retval[0] |= LINUX_O_APPEND;
if (result & O_FSYNC)
td->td_retval[0] |= LINUX_O_SYNC;
if (result & O_ASYNC)
td->td_retval[0] |= LINUX_FASYNC;
#ifdef LINUX_O_NOFOLLOW
if (result & O_NOFOLLOW)
td->td_retval[0] |= LINUX_O_NOFOLLOW;
#endif
#ifdef LINUX_O_DIRECT
if (result & O_DIRECT)
td->td_retval[0] |= LINUX_O_DIRECT;
#endif
return (error);
case LINUX_F_SETFL:
arg = 0;
if (args->arg & LINUX_O_NDELAY)
arg |= O_NONBLOCK;
if (args->arg & LINUX_O_APPEND)
arg |= O_APPEND;
if (args->arg & LINUX_O_SYNC)
arg |= O_FSYNC;
if (args->arg & LINUX_FASYNC)
arg |= O_ASYNC;
#ifdef LINUX_O_NOFOLLOW
if (args->arg & LINUX_O_NOFOLLOW)
arg |= O_NOFOLLOW;
#endif
#ifdef LINUX_O_DIRECT
if (args->arg & LINUX_O_DIRECT)
arg |= O_DIRECT;
#endif
return (kern_fcntl(td, args->fd, F_SETFL, arg));
case LINUX_F_GETLK:
error = copyin((void *)args->arg, &linux_flock,
sizeof(linux_flock));
if (error)
return (error);
linux_to_bsd_flock(&linux_flock, &bsd_flock);
error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
if (error)
return (error);
bsd_to_linux_flock(&bsd_flock, &linux_flock);
return (copyout(&linux_flock, (void *)args->arg,
sizeof(linux_flock)));
case LINUX_F_SETLK:
error = copyin((void *)args->arg, &linux_flock,
sizeof(linux_flock));
if (error)
return (error);
linux_to_bsd_flock(&linux_flock, &bsd_flock);
return (kern_fcntl(td, args->fd, F_SETLK,
(intptr_t)&bsd_flock));
case LINUX_F_SETLKW:
error = copyin((void *)args->arg, &linux_flock,
sizeof(linux_flock));
if (error)
return (error);
linux_to_bsd_flock(&linux_flock, &bsd_flock);
return (kern_fcntl(td, args->fd, F_SETLKW,
(intptr_t)&bsd_flock));
case LINUX_F_GETOWN:
return (kern_fcntl(td, args->fd, F_GETOWN, 0));
case LINUX_F_SETOWN:
/*
* XXX some Linux applications depend on F_SETOWN having no
* significant effect for pipes (SIGIO is not delivered for
* pipes under Linux-2.2.35 at least).
*/
error = fget(td, args->fd, &fp);
if (error)
return (error);
if (fp->f_type == DTYPE_PIPE) {
fdrop(fp, td);
return (EINVAL);
}
fdrop(fp, td);
return (kern_fcntl(td, args->fd, F_SETOWN, args->arg));
}
return (EINVAL);
}
int
linux_fcntl(struct thread *td, struct linux_fcntl_args *args)
{
struct linux_fcntl64_args args64;
#ifdef DEBUG
if (ldebug(fcntl))
printf(ARGS(fcntl, "%d, %08x, *"), args->fd, args->cmd);
#endif
args64.fd = args->fd;
args64.cmd = args->cmd;
args64.arg = args->arg;
return (fcntl_common(td, &args64));
}
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_fcntl64(struct thread *td, struct linux_fcntl64_args *args)
{
struct l_flock64 linux_flock;
struct flock bsd_flock;
int error;
#ifdef DEBUG
if (ldebug(fcntl64))
printf(ARGS(fcntl64, "%d, %08x, *"), args->fd, args->cmd);
#endif
switch (args->cmd) {
case LINUX_F_GETLK64:
error = copyin((void *)args->arg, &linux_flock,
sizeof(linux_flock));
if (error)
return (error);
linux_to_bsd_flock64(&linux_flock, &bsd_flock);
error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
if (error)
return (error);
bsd_to_linux_flock64(&bsd_flock, &linux_flock);
return (copyout(&linux_flock, (void *)args->arg,
sizeof(linux_flock)));
case LINUX_F_SETLK64:
error = copyin((void *)args->arg, &linux_flock,
sizeof(linux_flock));
if (error)
return (error);
linux_to_bsd_flock64(&linux_flock, &bsd_flock);
return (kern_fcntl(td, args->fd, F_SETLK,
(intptr_t)&bsd_flock));
case LINUX_F_SETLKW64:
error = copyin((void *)args->arg, &linux_flock,
sizeof(linux_flock));
if (error)
return (error);
linux_to_bsd_flock64(&linux_flock, &bsd_flock);
return (kern_fcntl(td, args->fd, F_SETLKW,
(intptr_t)&bsd_flock));
}
return (fcntl_common(td, args));
}
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
int
linux_chown(struct thread *td, struct linux_chown_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(chown))
printf(ARGS(chown, "%s, %d, %d"), path, args->uid, args->gid);
#endif
error = kern_chown(td, path, UIO_SYSSPACE, args->uid, args->gid);
LFREEPATH(path);
return (error);
}
int
linux_fchownat(struct thread *td, struct linux_fchownat_args *args)
{
char *path;
int error, dfd, follow;
if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
return (EINVAL);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
#ifdef DEBUG
if (ldebug(fchownat))
printf(ARGS(fchownat, "%s, %d, %d"), path, args->uid, args->gid);
#endif
follow = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 :
AT_SYMLINK_NOFOLLOW;
error = kern_fchownat(td, dfd, path, UIO_SYSSPACE, args->uid, args->gid,
follow);
LFREEPATH(path);
return (error);
}
int
linux_lchown(struct thread *td, struct linux_lchown_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(lchown))
printf(ARGS(lchown, "%s, %d, %d"), path, args->uid, args->gid);
#endif
error = kern_lchown(td, path, UIO_SYSSPACE, args->uid, args->gid);
LFREEPATH(path);
return (error);
}
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