/* $NetBSD: linux_file64.c,v 1.43 2007/12/08 18:36:07 dsl Exp $ */ /*- * Copyright (c) 1995, 1998, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Frank van der Linden and Eric Haszlakiewicz. * * 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. */ /* * Linux 64bit filesystem calls. Used on 32bit archs, not used on 64bit ones. */ #include __KERNEL_RCSID(0, "$NetBSD: linux_file64.c,v 1.43 2007/12/08 18:36:07 dsl Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef alpha # ifndef COMPAT_LINUX32 static void bsd_to_linux_stat(struct stat *, struct linux_stat64 *); static int linux_do_stat64(struct lwp *, void *, register_t *, int); /* * Convert a NetBSD stat structure to a Linux stat structure. * Only the order of the fields and the padding in the structure * is different. linux_fakedev is a machine-dependent function * which optionally converts device driver major/minor numbers * (XXX horrible, but what can you do against code that compares * things against constant major device numbers? sigh) */ static void bsd_to_linux_stat(struct stat *bsp, struct linux_stat64 *lsp) { lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); lsp->lst_ino = bsp->st_ino; lsp->lst_mode = (linux_mode_t)bsp->st_mode; if (bsp->st_nlink >= (1 << 15)) lsp->lst_nlink = (1 << 15) - 1; else lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; lsp->lst_uid = bsp->st_uid; lsp->lst_gid = bsp->st_gid; lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); lsp->lst_size = bsp->st_size; lsp->lst_blksize = bsp->st_blksize; lsp->lst_blocks = bsp->st_blocks; lsp->lst_atime = bsp->st_atime; lsp->lst_mtime = bsp->st_mtime; lsp->lst_ctime = bsp->st_ctime; # ifdef LINUX_STAT64_HAS_NSEC lsp->lst_atime_nsec = bsp->st_atimensec; lsp->lst_mtime_nsec = bsp->st_mtimensec; lsp->lst_ctime_nsec = bsp->st_ctimensec; # endif # if LINUX_STAT64_HAS_BROKEN_ST_INO lsp->__lst_ino = (linux_ino_t) bsp->st_ino; # endif } /* * The stat functions below are plain sailing. stat and lstat are handled * by one function to avoid code duplication. */ int linux_sys_fstat64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_fstat64_args /* { syscallarg(int) fd; syscallarg(struct linux_stat64 *) sp; } */ *uap = v; struct linux_stat64 tmplst; struct stat tmpst; int error; error = do_sys_fstat(l, SCARG(uap, fd), &tmpst); if (error != 0) return error; bsd_to_linux_stat(&tmpst, &tmplst); return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); } static int linux_do_stat64(struct lwp *l, void *v, register_t *retval, int flags) { struct linux_stat64 tmplst; struct stat tmpst; int error; struct linux_sys_stat64_args *uap = v; error = do_sys_stat(l, SCARG(uap, path), flags, &tmpst); if (error != 0) return error; bsd_to_linux_stat(&tmpst, &tmplst); return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); } int linux_sys_stat64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_stat64_args /* { syscallarg(const char *) path; syscallarg(struct linux_stat64 *) sp; } */ *uap = v; return linux_do_stat64(l, uap, retval, FOLLOW); } int linux_sys_lstat64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_lstat64_args /* { syscallarg(const char *) path; syscallarg(struct linux_stat64 *) sp; } */ *uap = v; return linux_do_stat64(l, uap, retval, NOFOLLOW); } int linux_sys_truncate64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_truncate64_args /* { syscallarg(const char *) path; syscallarg(off_t) length; } */ *uap = v; struct sys_truncate_args ta; /* Linux doesn't have the 'pad' pseudo-parameter */ SCARG(&ta, path) = SCARG(uap, path); SCARG(&ta, pad) = 0; SCARG(&ta, length) = SCARG(uap, length); return sys_truncate(l, &ta, retval); } int linux_sys_ftruncate64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_ftruncate64_args /* { syscallarg(unsigned int) fd; syscallarg(off_t) length; } */ *uap = v; struct sys_ftruncate_args ta; /* Linux doesn't have the 'pad' pseudo-parameter */ SCARG(&ta, fd) = SCARG(uap, fd); SCARG(&ta, pad) = 0; SCARG(&ta, length) = SCARG(uap, length); return sys_ftruncate(l, &ta, retval); } # endif /* !COMPAT_LINUX32 */ # if !defined(__m68k__) && (!defined(__amd64__) || defined(COMPAT_LINUX32)) static void bsd_to_linux_flock64(struct linux_flock64 *, const struct flock *); static void linux_to_bsd_flock64(struct flock *, const struct linux_flock64 *); static void bsd_to_linux_flock64(struct linux_flock64 *lfp, const struct flock *bfp) { lfp->l_start = bfp->l_start; lfp->l_len = bfp->l_len; lfp->l_pid = bfp->l_pid; lfp->l_whence = bfp->l_whence; switch (bfp->l_type) { case F_RDLCK: lfp->l_type = LINUX_F_RDLCK; break; case F_UNLCK: lfp->l_type = LINUX_F_UNLCK; break; case F_WRLCK: lfp->l_type = LINUX_F_WRLCK; break; } } static void linux_to_bsd_flock64(struct flock *bfp, const struct linux_flock64 *lfp) { bfp->l_start = lfp->l_start; bfp->l_len = lfp->l_len; bfp->l_pid = lfp->l_pid; bfp->l_whence = lfp->l_whence; switch (lfp->l_type) { case LINUX_F_RDLCK: bfp->l_type = F_RDLCK; break; case LINUX_F_UNLCK: bfp->l_type = F_UNLCK; break; case LINUX_F_WRLCK: bfp->l_type = F_WRLCK; break; } } int linux_sys_fcntl64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_fcntl64_args /* { syscallarg(int) fd; syscallarg(int) cmd; syscallarg(void *) arg; } */ *uap = v; struct linux_flock64 lfl; struct flock bfl; int error; void *arg = SCARG(uap, arg); int cmd = SCARG(uap, cmd); int fd = SCARG(uap, fd); switch (cmd) { case LINUX_F_GETLK64: if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) return error; linux_to_bsd_flock64(&bfl, &lfl); error = do_fcntl_lock(l, fd, F_GETLK, &bfl); if (error != 0) return error; bsd_to_linux_flock64(&lfl, &bfl); return copyout(&lfl, arg, sizeof lfl); case LINUX_F_SETLK64: case LINUX_F_SETLKW64: cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) return error; linux_to_bsd_flock64(&bfl, &lfl); return do_fcntl_lock(l, fd, cmd, &bfl); default: return linux_sys_fcntl(l, v, retval); } } # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ #endif /* !alpha */ /* * Linux 'readdir' call. This code is mostly taken from the * SunOS getdents call (see compat/sunos/sunos_misc.c), though * an attempt has been made to keep it a little cleaner. * * The d_off field contains the offset of the next valid entry, * unless the older Linux getdents(2), which used to have it set * to the offset of the entry itself. This function also doesn't * need to deal with the old count == 1 glibc problem. * * Read in BSD-style entries, convert them, and copy them out. * * Note that this doesn't handle union-mounted filesystems. */ #ifndef COMPAT_LINUX32 int linux_sys_getdents64(struct lwp *l, void *v, register_t *retval) { struct linux_sys_getdents_args /* { syscallarg(int) fd; syscallarg(struct linux_dirent64 *) dent; syscallarg(unsigned int) count; } */ *uap = v; struct dirent *bdp; struct vnode *vp; char *inp, *tbuf; /* BSD-format */ int len, reclen; /* BSD-format */ char *outp; /* Linux-format */ int resid, linux_reclen = 0; /* Linux-format */ struct file *fp; struct uio auio; struct iovec aiov; struct linux_dirent64 idb; off_t off; /* true file offset */ int buflen, error, eofflag, nbytes; struct vattr va; off_t *cookiebuf = NULL, *cookie; int ncookies; /* getvnode() will use the descriptor for us */ if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) { error = EBADF; goto out1; } vp = (struct vnode *)fp->f_data; if (vp->v_type != VDIR) { error = EINVAL; goto out1; } if ((error = VOP_GETATTR(vp, &va, l->l_cred))) goto out1; nbytes = SCARG(uap, count); buflen = min(MAXBSIZE, nbytes); if (buflen < va.va_blocksize) buflen = va.va_blocksize; tbuf = malloc(buflen, M_TEMP, M_WAITOK); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); off = fp->f_offset; again: aiov.iov_base = tbuf; aiov.iov_len = buflen; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_resid = buflen; auio.uio_offset = off; UIO_SETUP_SYSSPACE(&auio); /* * First we read into the malloc'ed buffer, then * we massage it into user space, one record at a time. */ error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, &ncookies); if (error) goto out; inp = tbuf; outp = (void *)SCARG(uap, dent); resid = nbytes; if ((len = buflen - auio.uio_resid) == 0) goto eof; for (cookie = cookiebuf; len > 0; len -= reclen) { bdp = (struct dirent *)inp; reclen = bdp->d_reclen; if (reclen & 3) panic("linux_readdir"); if (bdp->d_fileno == 0) { inp += reclen; /* it is a hole; squish it out */ if (cookie) off = *cookie++; else off += reclen; continue; } linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); if (reclen > len || resid < linux_reclen) { /* entry too big for buffer, so just stop */ outp++; break; } if (cookie) off = *cookie++; /* each entry points to next */ else off += reclen; /* * Massage in place to make a Linux-shaped dirent (otherwise * we have to worry about touching user memory outside of * the copyout() call). */ idb.d_ino = bdp->d_fileno; idb.d_type = bdp->d_type; idb.d_off = off; idb.d_reclen = (u_short)linux_reclen; strcpy(idb.d_name, bdp->d_name); if ((error = copyout((void *)&idb, outp, linux_reclen))) goto out; /* advance past this real entry */ inp += reclen; /* advance output past Linux-shaped entry */ outp += linux_reclen; resid -= linux_reclen; } /* if we squished out the whole block, try again */ if (outp == (void *)SCARG(uap, dent)) goto again; fp->f_offset = off; /* update the vnode offset */ eof: *retval = nbytes - resid; out: VOP_UNLOCK(vp, 0); if (cookiebuf) free(cookiebuf, M_TEMP); free(tbuf, M_TEMP); out1: FILE_UNUSE(fp, l); return error; } #endif /* !COMPAT_LINUX32 */