2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
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>
37 #include <sys/filedesc.h>
38 #include <sys/fcntl.h>
39 #include <sys/linker.h>
43 kobj_free(void *address, size_t size)
46 kmem_free(address, size);
50 kobj_alloc(size_t size, int flag)
53 return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
57 kobj_zalloc(size_t size, int flag)
61 if ((p = kobj_alloc(size, flag)) != NULL)
67 kobj_open_file_vnode(const char *file)
69 struct thread *td = curthread;
72 int error, flags, vfslocked;
74 fd = td->td_proc->p_fd;
76 if (fd->fd_rdir == NULL) {
77 fd->fd_rdir = rootvnode;
80 if (fd->fd_cdir == NULL) {
81 fd->fd_cdir = rootvnode;
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);
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);
100 kobj_open_file_loader(const char *file)
103 return (preload_search_by_name(file));
107 kobj_open_file(const char *file)
111 out = kmem_alloc(sizeof(*out), KM_SLEEP);
112 out->mounted = root_mounted();
114 * If root is already mounted we read file using file system,
115 * if not, we use loader.
118 out->ptr = kobj_open_file_vnode(file);
120 out->ptr = kobj_open_file_loader(file);
121 if (out->ptr == NULL) {
122 kmem_free(out, sizeof(*out));
123 return ((struct _buf *)-1);
129 kobj_get_filesize_vnode(struct _buf *file, uint64_t *size)
131 struct vnode *vp = file->ptr;
133 int error, vfslocked;
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);
140 *size = (uint64_t)va.va_size;
141 VFS_UNLOCK_GIANT(vfslocked);
146 kobj_get_filesize_loader(struct _buf *file, uint64_t *size)
150 ptr = preload_search_info(file->ptr, MODINFO_SIZE);
153 *size = (uint64_t)*(size_t *)ptr;
158 kobj_get_filesize(struct _buf *file, uint64_t *size)
162 return (kobj_get_filesize_vnode(file, size));
164 return (kobj_get_filesize_loader(file, size));
168 kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off)
170 struct vnode *vp = file->ptr;
171 struct thread *td = curthread;
174 int error, vfslocked;
176 bzero(&aiov, sizeof(aiov));
177 bzero(&auio, sizeof(auio));
182 auio.uio_iov = &aiov;
183 auio.uio_offset = (off_t)off;
184 auio.uio_segflg = UIO_SYSSPACE;
185 auio.uio_rw = UIO_READ;
187 auio.uio_resid = size;
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);
194 VFS_UNLOCK_GIANT(vfslocked);
195 return (error != 0 ? -1 : size - auio.uio_resid);
199 kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off)
203 ptr = preload_fetch_addr(file->ptr);
206 bcopy(ptr + off, buf, size);
211 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
215 return (kobj_read_file_vnode(file, buf, size, off));
217 return (kobj_read_file_loader(file, buf, size, off));
221 kobj_close_file(struct _buf *file)
225 struct vnode *vp = file->ptr;
226 struct thread *td = curthread;
229 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
230 vn_close(vp, FREAD, td->td_ucred, td);
231 VFS_UNLOCK_GIANT(vfslocked);
233 kmem_free(file, sizeof(*file));