/* $NetBSD: linux_file64.c,v 1.58.6.2 2020/01/21 18:12:54 martin Exp $ */ /*- * Copyright (c) 1995, 1998, 2000, 2008 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. * * 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 1.58.6.2 2020/01/21 18:12:54 martin 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 static void bsd_to_linux_stat(struct stat *, struct linux_stat64 *); /* * 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) { memset(lsp, 0, sizeof(*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, const struct linux_sys_fstat64_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(struct linux_stat64 *) sp; } */ struct linux_stat64 tmplst; struct stat tmpst; int error; error = do_sys_fstat(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, const struct linux_sys_stat64_args *uap, register_t *retval, int flags) { struct linux_stat64 tmplst; struct stat tmpst; int error; error = do_sys_stat(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, const struct linux_sys_stat64_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(struct linux_stat64 *) sp; } */ return linux_do_stat64(l, uap, retval, FOLLOW); } int linux_sys_lstat64(struct lwp *l, const struct linux_sys_lstat64_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(struct linux_stat64 *) sp; } */ return linux_do_stat64(l, (const void *)uap, retval, NOFOLLOW); } int linux_sys_fstatat64(struct lwp *l, const struct linux_sys_fstatat64_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const char *) path; syscallarg(struct linux_stat64 *) sp; syscallarg(int) flag; } */ struct linux_stat64 tmplst; struct stat tmpst; int error, nd_flag; if (SCARG(uap, flag) & LINUX_AT_SYMLINK_NOFOLLOW) nd_flag = NOFOLLOW; else nd_flag = FOLLOW; error = do_sys_statat(l, SCARG(uap, fd), SCARG(uap, path), nd_flag, &tmpst); if (error != 0) return error; bsd_to_linux_stat(&tmpst, &tmplst); return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); } #ifndef __alpha__ int linux_sys_truncate64(struct lwp *l, const struct linux_sys_truncate64_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(off_t) length; } */ 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, const struct linux_sys_ftruncate64_args *uap, register_t *retval) { /* { syscallarg(unsigned int) fd; syscallarg(off_t) length; } */ 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 /* __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. */ int linux_sys_getdents64(struct lwp *l, const struct linux_sys_getdents64_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(struct linux_dirent64 *) dent; syscallarg(unsigned int) count; } */ 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 */ file_t *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; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(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 = ENOTDIR; goto out1; } vn_lock(vp, LK_SHARED | LK_RETRY); error = VOP_GETATTR(vp, &va, l->l_cred); VOP_UNLOCK(vp); if (error) 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) { error = EIO; goto out; } 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). */ memset(&idb, 0, sizeof(idb)); idb.d_ino = bdp->d_fileno; idb.d_type = bdp->d_type; idb.d_off = off; idb.d_reclen = (u_short)linux_reclen; memcpy(idb.d_name, bdp->d_name, MIN(sizeof(idb.d_name), bdp->d_namlen + 1)); 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)) { if (cookiebuf) free(cookiebuf, M_TEMP); cookiebuf = NULL; goto again; } fp->f_offset = off; /* update the vnode offset */ eof: *retval = nbytes - resid; out: VOP_UNLOCK(vp); if (cookiebuf) free(cookiebuf, M_TEMP); free(tbuf, M_TEMP); out1: fd_putfile(SCARG(uap, fd)); return error; }