1/*- 2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/types.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/systm.h> 34#include <sys/kthread.h> 35#include <sys/namei.h> 36#include <sys/proc.h> 37#include <sys/filedesc.h> 38#include <sys/fcntl.h> 39#include <sys/linker.h> 40#include <sys/kobj.h> 41 42void 43kobj_free(void *address, size_t size) 44{ 45 46 kmem_free(address, size); 47} 48 49void * 50kobj_alloc(size_t size, int flag) 51{ 52 53 return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP)); 54} 55 56void * 57kobj_zalloc(size_t size, int flag) 58{ 59 void *p; 60 61 if ((p = kobj_alloc(size, flag)) != NULL) 62 bzero(p, size); 63 return (p); 64} 65 66static void * 67kobj_open_file_vnode(const char *file) 68{ 69 struct thread *td = curthread; 70 struct filedesc *fd; 71 struct nameidata nd; 72 int error, flags; 73 74 fd = td->td_proc->p_fd; 75 FILEDESC_XLOCK(fd); 76 if (fd->fd_rdir == NULL) { 77 fd->fd_rdir = rootvnode; 78 vref(fd->fd_rdir); 79 } 80 if (fd->fd_cdir == NULL) { 81 fd->fd_cdir = rootvnode; 82 vref(fd->fd_cdir); 83 } 84 FILEDESC_XUNLOCK(fd); 85 86 flags = FREAD | O_NOFOLLOW; 87 NDINIT(&nd, LOOKUP, 0, UIO_SYSSPACE, file, td); 88 error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL); 89 if (error != 0) 90 return (NULL); 91 NDFREE(&nd, NDF_ONLY_PNBUF); 92 /* We just unlock so we hold a reference. */ 93 VOP_UNLOCK(nd.ni_vp, 0); 94 return (nd.ni_vp); 95} 96 97static void * 98kobj_open_file_loader(const char *file) 99{ 100 101 return (preload_search_by_name(file)); 102} 103 104struct _buf * 105kobj_open_file(const char *file) 106{ 107 struct _buf *out; 108 109 out = kmem_alloc(sizeof(*out), KM_SLEEP); 110 out->mounted = root_mounted(); 111 /* 112 * If root is already mounted we read file using file system, 113 * if not, we use loader. 114 */ 115 if (out->mounted) 116 out->ptr = kobj_open_file_vnode(file); 117 else 118 out->ptr = kobj_open_file_loader(file); 119 if (out->ptr == NULL) { 120 kmem_free(out, sizeof(*out)); 121 return ((struct _buf *)-1); 122 } 123 return (out); 124} 125 126static int 127kobj_get_filesize_vnode(struct _buf *file, uint64_t *size) 128{ 129 struct vnode *vp = file->ptr; 130 struct vattr va; 131 int error; 132 133 vn_lock(vp, LK_SHARED | LK_RETRY); 134 error = VOP_GETATTR(vp, &va, curthread->td_ucred); 135 VOP_UNLOCK(vp, 0); 136 if (error == 0) 137 *size = (uint64_t)va.va_size; 138 return (error); 139} 140 141static int 142kobj_get_filesize_loader(struct _buf *file, uint64_t *size) 143{ 144 void *ptr; 145 146 ptr = preload_search_info(file->ptr, MODINFO_SIZE); 147 if (ptr == NULL) 148 return (ENOENT); 149 *size = (uint64_t)*(size_t *)ptr; 150 return (0); 151} 152 153int 154kobj_get_filesize(struct _buf *file, uint64_t *size) 155{ 156 157 if (file->mounted) 158 return (kobj_get_filesize_vnode(file, size)); 159 else 160 return (kobj_get_filesize_loader(file, size)); 161} 162 163int 164kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off) 165{ 166 struct vnode *vp = file->ptr; 167 struct thread *td = curthread; 168 struct uio auio; 169 struct iovec aiov; 170 int error; 171 172 bzero(&aiov, sizeof(aiov)); 173 bzero(&auio, sizeof(auio)); 174 175 aiov.iov_base = buf; 176 aiov.iov_len = size; 177 178 auio.uio_iov = &aiov; 179 auio.uio_offset = (off_t)off; 180 auio.uio_segflg = UIO_SYSSPACE; 181 auio.uio_rw = UIO_READ; 182 auio.uio_iovcnt = 1; 183 auio.uio_resid = size; 184 auio.uio_td = td; 185 186 vn_lock(vp, LK_SHARED | LK_RETRY); 187 error = VOP_READ(vp, &auio, IO_UNIT | IO_SYNC, td->td_ucred); 188 VOP_UNLOCK(vp, 0); 189 return (error != 0 ? -1 : size - auio.uio_resid); 190} 191 192int 193kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off) 194{ 195 char *ptr; 196 197 ptr = preload_fetch_addr(file->ptr); 198 if (ptr == NULL) 199 return (ENOENT); 200 bcopy(ptr + off, buf, size); 201 return (0); 202} 203 204int 205kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off) 206{ 207 208 if (file->mounted) 209 return (kobj_read_file_vnode(file, buf, size, off)); 210 else 211 return (kobj_read_file_loader(file, buf, size, off)); 212} 213 214void 215kobj_close_file(struct _buf *file) 216{ 217 218 if (file->mounted) 219 vn_close(file->ptr, FREAD, curthread->td_ucred, curthread); 220 kmem_free(file, sizeof(*file)); 221} 222