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, vfslocked; 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, MPSAFE, 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 vfslocked = NDHASGIANT(&nd); 92 NDFREE(&nd, NDF_ONLY_PNBUF); 93 /* We just unlock so we hold a reference. */ 94 VOP_UNLOCK(nd.ni_vp, 0); 95 VFS_UNLOCK_GIANT(vfslocked); 96 return (nd.ni_vp); 97} 98 99static void * 100kobj_open_file_loader(const char *file) 101{ 102 103 return (preload_search_by_name(file)); 104} 105 106struct _buf * 107kobj_open_file(const char *file) 108{ 109 struct _buf *out; 110 111 out = kmem_alloc(sizeof(*out), KM_SLEEP); 112 out->mounted = root_mounted(); 113 /* 114 * If root is already mounted we read file using file system, 115 * if not, we use loader. 116 */ 117 if (out->mounted) 118 out->ptr = kobj_open_file_vnode(file); 119 else 120 out->ptr = kobj_open_file_loader(file); 121 if (out->ptr == NULL) { 122 kmem_free(out, sizeof(*out)); 123 return ((struct _buf *)-1); 124 } 125 return (out); 126} 127 128static int 129kobj_get_filesize_vnode(struct _buf *file, uint64_t *size) 130{ 131 struct vnode *vp = file->ptr; 132 struct vattr va; 133 int error, vfslocked; 134 135 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 136 vn_lock(vp, LK_SHARED | LK_RETRY); 137 error = VOP_GETATTR(vp, &va, curthread->td_ucred); 138 VOP_UNLOCK(vp, 0); 139 if (error == 0) 140 *size = (uint64_t)va.va_size; 141 VFS_UNLOCK_GIANT(vfslocked); 142 return (error); 143} 144 145static int 146kobj_get_filesize_loader(struct _buf *file, uint64_t *size) 147{ 148 void *ptr; 149 150 ptr = preload_search_info(file->ptr, MODINFO_SIZE); 151 if (ptr == NULL) 152 return (ENOENT); 153 *size = (uint64_t)*(size_t *)ptr; 154 return (0); 155} 156 157int 158kobj_get_filesize(struct _buf *file, uint64_t *size) 159{ 160 161 if (file->mounted) 162 return (kobj_get_filesize_vnode(file, size)); 163 else 164 return (kobj_get_filesize_loader(file, size)); 165} 166 167int 168kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off) 169{ 170 struct vnode *vp = file->ptr; 171 struct thread *td = curthread; 172 struct uio auio; 173 struct iovec aiov; 174 int error, vfslocked; 175 176 bzero(&aiov, sizeof(aiov)); 177 bzero(&auio, sizeof(auio)); 178 179 aiov.iov_base = buf; 180 aiov.iov_len = size; 181 182 auio.uio_iov = &aiov; 183 auio.uio_offset = (off_t)off; 184 auio.uio_segflg = UIO_SYSSPACE; 185 auio.uio_rw = UIO_READ; 186 auio.uio_iovcnt = 1; 187 auio.uio_resid = size; 188 auio.uio_td = td; 189 190 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 191 vn_lock(vp, LK_SHARED | LK_RETRY); 192 error = VOP_READ(vp, &auio, IO_UNIT | IO_SYNC, td->td_ucred); 193 VOP_UNLOCK(vp, 0); 194 VFS_UNLOCK_GIANT(vfslocked); 195 return (error != 0 ? -1 : size - auio.uio_resid); 196} 197 198int 199kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off) 200{ 201 char *ptr; 202 203 ptr = preload_fetch_addr(file->ptr); 204 if (ptr == NULL) 205 return (ENOENT); 206 bcopy(ptr + off, buf, size); 207 return (0); 208} 209 210int 211kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off) 212{ 213 214 if (file->mounted) 215 return (kobj_read_file_vnode(file, buf, size, off)); 216 else 217 return (kobj_read_file_loader(file, buf, size, off)); 218} 219 220void 221kobj_close_file(struct _buf *file) 222{ 223 224 if (file->mounted) { 225 struct vnode *vp = file->ptr; 226 struct thread *td = curthread; 227 int vfslocked; 228 229 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 230 vn_close(vp, FREAD, td->td_ucred, td); 231 VFS_UNLOCK_GIANT(vfslocked); 232 } 233 kmem_free(file, sizeof(*file)); 234} 235