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freebsd-nq/sys/compat/linux/linux_file.c
Konstantin Belousov c5c1199c83 Extend the KPI to lock and unlock f_offset member of struct file. It 
now fully encapsulates all accesses to f_offset, and extends f_offset
locking to other consumers that need it, in particular, to lseek() and
variants of getdirentries().

Ensure that on 32bit architectures f_offset, which is 64bit quantity,
always read and written under the mtxpool protection. This fixes
apparently easy to trigger race when parallel lseek()s or lseek() and
read/write could destroy file offset.

The already broken ABI emulations, including iBCS and SysV, are not
converted (yet).

Tested by:	pho
No objections from:	jhb
MFC after:    3 weeks
2012-07-02 21:01:03 +00:00

1628 lines
37 KiB
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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/capability.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>
/* XXX */
int do_pipe(struct thread *td, int fildes[2], int flags);
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;
if (l_flags & LINUX_O_DIRECTORY)
bsd_flags |= O_DIRECTORY;
/* 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, CAP_IOCTL, &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);
}
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 = sys_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 = sys_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, CAP_READ, &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
fdrop(fp, td);
return (EBADF);
}
off = foffset_lock(fp, 0);
vp = fp->f_vnode;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
if (vp->v_type != VDIR) {
VFS_UNLOCK_GIANT(vfslocked);
foffset_unlock(fp, off, 0);
fdrop(fp, td);
return (EINVAL);
}
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);
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) {
nbytes = resid;
goto eof;
}
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);
foffset_unlock(fp, off, 0);
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->amode & ~(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->amode);
#endif
error = kern_access(td, path, UIO_SYSSPACE, args->amode);
LFREEPATH(path);
return (error);
}
int
linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
{
char *path;
int error, dfd, flag;
if (args->flag & ~LINUX_AT_EACCESS)
return (EINVAL);
/* linux convention */
if (args->amode & ~(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->amode);
#endif
flag = (args->flag & LINUX_AT_EACCESS) == 0 ? 0 : AT_EACCESS;
error = kern_accessat(td, dfd, path, UIO_SYSSPACE, flag, args->amode);
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 (sys_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, follow;
if (args->flag & ~LINUX_AT_SYMLINK_FOLLOW)
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->flag);
#endif
follow = (args->flag & LINUX_AT_SYMLINK_FOLLOW) == 0 ? NOFOLLOW :
FOLLOW;
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 sys_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 = sys_pread(td, &bsd);
if (error == 0) {
/* This seems to violate POSIX but linux does it */
if ((error = fgetvp(td, uap->fd, CAP_READ, &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 sys_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 (sys_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, CAP_FCNTL, &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, flag;
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
flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 :
AT_SYMLINK_NOFOLLOW;
error = kern_fchownat(td, dfd, path, UIO_SYSSPACE, args->uid, args->gid,
flag);
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);
}
static int
convert_fadvice(int advice)
{
switch (advice) {
case LINUX_POSIX_FADV_NORMAL:
return (POSIX_FADV_NORMAL);
case LINUX_POSIX_FADV_RANDOM:
return (POSIX_FADV_RANDOM);
case LINUX_POSIX_FADV_SEQUENTIAL:
return (POSIX_FADV_SEQUENTIAL);
case LINUX_POSIX_FADV_WILLNEED:
return (POSIX_FADV_WILLNEED);
case LINUX_POSIX_FADV_DONTNEED:
return (POSIX_FADV_DONTNEED);
case LINUX_POSIX_FADV_NOREUSE:
return (POSIX_FADV_NOREUSE);
default:
return (-1);
}
}
int
linux_fadvise64(struct thread *td, struct linux_fadvise64_args *args)
{
int advice;
advice = convert_fadvice(args->advice);
if (advice == -1)
return (EINVAL);
return (kern_posix_fadvise(td, args->fd, args->offset, args->len,
advice));
}
int
linux_fadvise64_64(struct thread *td, struct linux_fadvise64_64_args *args)
{
int advice;
advice = convert_fadvice(args->advice);
if (advice == -1)
return (EINVAL);
return (kern_posix_fadvise(td, args->fd, args->offset, args->len,
advice));
}
int
linux_pipe(struct thread *td, struct linux_pipe_args *args)
{
int fildes[2];
int error;
#ifdef DEBUG
if (ldebug(pipe))
printf(ARGS(pipe, "*"));
#endif
error = do_pipe(td, fildes, 0);
if (error)
return (error);
/* XXX: Close descriptors on error. */
return (copyout(fildes, args->pipefds, sizeof(fildes)));
}
int
linux_pipe2(struct thread *td, struct linux_pipe2_args *args)
{
int fildes[2];
int error, flags;
#ifdef DEBUG
if (ldebug(pipe2))
printf(ARGS(pipe2, "*, %d"), args->flags);
#endif
if ((args->flags & ~(LINUX_O_NONBLOCK | LINUX_O_CLOEXEC)) != 0)
return (EINVAL);
flags = 0;
if ((args->flags & LINUX_O_NONBLOCK) != 0)
flags |= O_NONBLOCK;
if ((args->flags & LINUX_O_CLOEXEC) != 0)
flags |= O_CLOEXEC;
error = do_pipe(td, fildes, flags);
if (error)
return (error);
/* XXX: Close descriptors on error. */
return (copyout(fildes, args->pipefds, sizeof(fildes)));
}
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