1168404Spjd/*- 2168404Spjd * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3168404Spjd * All rights reserved. 4168404Spjd * 5168404Spjd * Redistribution and use in source and binary forms, with or without 6168404Spjd * modification, are permitted provided that the following conditions 7168404Spjd * are met: 8168404Spjd * 1. Redistributions of source code must retain the above copyright 9168404Spjd * notice, this list of conditions and the following disclaimer. 10168404Spjd * 2. Redistributions in binary form must reproduce the above copyright 11168404Spjd * notice, this list of conditions and the following disclaimer in the 12168404Spjd * documentation and/or other materials provided with the distribution. 13168404Spjd * 14168404Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15168404Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16168404Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17168404Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18168404Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19168404Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20168404Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21168404Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22168404Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23168404Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24168404Spjd * SUCH DAMAGE. 25168404Spjd */ 26168404Spjd 27168404Spjd#include <sys/cdefs.h> 28168404Spjd__FBSDID("$FreeBSD$"); 29168404Spjd 30168404Spjd#include <sys/types.h> 31168404Spjd#include <sys/systm.h> 32168404Spjd#include <sys/kernel.h> 33168508Spjd#include <sys/systm.h> 34168404Spjd#include <sys/kthread.h> 35168404Spjd#include <sys/namei.h> 36168404Spjd#include <sys/proc.h> 37168404Spjd#include <sys/filedesc.h> 38168404Spjd#include <sys/fcntl.h> 39168508Spjd#include <sys/linker.h> 40168404Spjd#include <sys/kobj.h> 41168404Spjd 42168404Spjdvoid 43168404Spjdkobj_free(void *address, size_t size) 44168404Spjd{ 45168404Spjd 46168404Spjd kmem_free(address, size); 47168404Spjd} 48168404Spjd 49168404Spjdvoid * 50168404Spjdkobj_alloc(size_t size, int flag) 51168404Spjd{ 52168404Spjd 53168404Spjd return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP)); 54168404Spjd} 55168404Spjd 56168404Spjdvoid * 57168404Spjdkobj_zalloc(size_t size, int flag) 58168404Spjd{ 59168404Spjd void *p; 60168404Spjd 61168404Spjd if ((p = kobj_alloc(size, flag)) != NULL) 62168404Spjd bzero(p, size); 63168404Spjd return (p); 64168404Spjd} 65168404Spjd 66168508Spjdstatic void * 67168508Spjdkobj_open_file_vnode(const char *file) 68168404Spjd{ 69168404Spjd struct thread *td = curthread; 70185319Spjd struct filedesc *fd; 71168404Spjd struct nameidata nd; 72196966Skib int error, flags, vfslocked; 73168404Spjd 74185319Spjd fd = td->td_proc->p_fd; 75185319Spjd FILEDESC_XLOCK(fd); 76185319Spjd if (fd->fd_rdir == NULL) { 77185319Spjd fd->fd_rdir = rootvnode; 78185319Spjd vref(fd->fd_rdir); 79185319Spjd } 80185319Spjd if (fd->fd_cdir == NULL) { 81185319Spjd fd->fd_cdir = rootvnode; 82185319Spjd vref(fd->fd_cdir); 83185319Spjd } 84185319Spjd FILEDESC_XUNLOCK(fd); 85168404Spjd 86194617Skib flags = FREAD | O_NOFOLLOW; 87185319Spjd NDINIT(&nd, LOOKUP, MPSAFE, UIO_SYSSPACE, file, td); 88194617Skib error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL); 89168404Spjd if (error != 0) 90168508Spjd return (NULL); 91196966Skib vfslocked = NDHASGIANT(&nd); 92196966Skib NDFREE(&nd, NDF_ONLY_PNBUF); 93168404Spjd /* We just unlock so we hold a reference. */ 94175294Sattilio VOP_UNLOCK(nd.ni_vp, 0); 95196966Skib VFS_UNLOCK_GIANT(vfslocked); 96168508Spjd return (nd.ni_vp); 97168404Spjd} 98168404Spjd 99168508Spjdstatic void * 100168508Spjdkobj_open_file_loader(const char *file) 101168404Spjd{ 102168508Spjd 103168508Spjd return (preload_search_by_name(file)); 104168508Spjd} 105168508Spjd 106168508Spjdstruct _buf * 107168508Spjdkobj_open_file(const char *file) 108168508Spjd{ 109168508Spjd struct _buf *out; 110168508Spjd 111168508Spjd out = kmem_alloc(sizeof(*out), KM_SLEEP); 112168508Spjd out->mounted = root_mounted(); 113168508Spjd /* 114168508Spjd * If root is already mounted we read file using file system, 115168508Spjd * if not, we use loader. 116168508Spjd */ 117168508Spjd if (out->mounted) 118168508Spjd out->ptr = kobj_open_file_vnode(file); 119168508Spjd else 120168508Spjd out->ptr = kobj_open_file_loader(file); 121168508Spjd if (out->ptr == NULL) { 122168508Spjd kmem_free(out, sizeof(*out)); 123168508Spjd return ((struct _buf *)-1); 124168508Spjd } 125168508Spjd return (out); 126168508Spjd} 127168508Spjd 128168508Spjdstatic int 129168508Spjdkobj_get_filesize_vnode(struct _buf *file, uint64_t *size) 130168508Spjd{ 131168508Spjd struct vnode *vp = file->ptr; 132168404Spjd struct vattr va; 133185319Spjd int error, vfslocked; 134168404Spjd 135185319Spjd vfslocked = VFS_LOCK_GIANT(vp->v_mount); 136175202Sattilio vn_lock(vp, LK_SHARED | LK_RETRY); 137182371Sattilio error = VOP_GETATTR(vp, &va, curthread->td_ucred); 138175294Sattilio VOP_UNLOCK(vp, 0); 139168404Spjd if (error == 0) 140168404Spjd *size = (uint64_t)va.va_size; 141185319Spjd VFS_UNLOCK_GIANT(vfslocked); 142168404Spjd return (error); 143168404Spjd} 144168404Spjd 145168508Spjdstatic int 146168508Spjdkobj_get_filesize_loader(struct _buf *file, uint64_t *size) 147168508Spjd{ 148168508Spjd void *ptr; 149168508Spjd 150168508Spjd ptr = preload_search_info(file->ptr, MODINFO_SIZE); 151168508Spjd if (ptr == NULL) 152168508Spjd return (ENOENT); 153168508Spjd *size = (uint64_t)*(size_t *)ptr; 154168508Spjd return (0); 155168508Spjd} 156168508Spjd 157168404Spjdint 158168508Spjdkobj_get_filesize(struct _buf *file, uint64_t *size) 159168404Spjd{ 160168508Spjd 161168508Spjd if (file->mounted) 162168508Spjd return (kobj_get_filesize_vnode(file, size)); 163168508Spjd else 164168508Spjd return (kobj_get_filesize_loader(file, size)); 165168508Spjd} 166168508Spjd 167168508Spjdint 168168508Spjdkobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off) 169168508Spjd{ 170168508Spjd struct vnode *vp = file->ptr; 171168404Spjd struct thread *td = curthread; 172168404Spjd struct uio auio; 173168404Spjd struct iovec aiov; 174185319Spjd int error, vfslocked; 175168404Spjd 176168404Spjd bzero(&aiov, sizeof(aiov)); 177168404Spjd bzero(&auio, sizeof(auio)); 178168404Spjd 179168404Spjd aiov.iov_base = buf; 180168404Spjd aiov.iov_len = size; 181168404Spjd 182168404Spjd auio.uio_iov = &aiov; 183168404Spjd auio.uio_offset = (off_t)off; 184168404Spjd auio.uio_segflg = UIO_SYSSPACE; 185168404Spjd auio.uio_rw = UIO_READ; 186168404Spjd auio.uio_iovcnt = 1; 187168404Spjd auio.uio_resid = size; 188168404Spjd auio.uio_td = td; 189168404Spjd 190185319Spjd vfslocked = VFS_LOCK_GIANT(vp->v_mount); 191175202Sattilio vn_lock(vp, LK_SHARED | LK_RETRY); 192168404Spjd error = VOP_READ(vp, &auio, IO_UNIT | IO_SYNC, td->td_ucred); 193175294Sattilio VOP_UNLOCK(vp, 0); 194185319Spjd VFS_UNLOCK_GIANT(vfslocked); 195168404Spjd return (error != 0 ? -1 : size - auio.uio_resid); 196168404Spjd} 197168404Spjd 198168508Spjdint 199168508Spjdkobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off) 200168508Spjd{ 201168508Spjd char *ptr; 202168508Spjd 203218665Smarcel ptr = preload_fetch_addr(file->ptr); 204168508Spjd if (ptr == NULL) 205168508Spjd return (ENOENT); 206168508Spjd bcopy(ptr + off, buf, size); 207168508Spjd return (0); 208168508Spjd} 209168508Spjd 210168508Spjdint 211168508Spjdkobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off) 212168508Spjd{ 213168508Spjd 214168508Spjd if (file->mounted) 215168508Spjd return (kobj_read_file_vnode(file, buf, size, off)); 216168508Spjd else 217168508Spjd return (kobj_read_file_loader(file, buf, size, off)); 218168508Spjd} 219168508Spjd 220168404Spjdvoid 221168404Spjdkobj_close_file(struct _buf *file) 222168404Spjd{ 223168404Spjd 224168508Spjd if (file->mounted) { 225168508Spjd struct vnode *vp = file->ptr; 226168508Spjd struct thread *td = curthread; 227185319Spjd int vfslocked; 228168508Spjd 229185319Spjd vfslocked = VFS_LOCK_GIANT(vp->v_mount); 230185319Spjd vn_close(vp, FREAD, td->td_ucred, td); 231185319Spjd VFS_UNLOCK_GIANT(vfslocked); 232168508Spjd } 233168508Spjd kmem_free(file, sizeof(*file)); 234168404Spjd} 235