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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/kthread.h>
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#include <sys/namei.h>
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#include <sys/filedesc.h>
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#include <sys/fcntl.h>
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#include <sys/linker.h>
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kobj_free(void *address, size_t size)
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kmem_free(address, size);
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kobj_alloc(size_t size, int flag)
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return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
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kobj_zalloc(size_t size, int flag)
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if ((p = kobj_alloc(size, flag)) != NULL)
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kobj_open_file_vnode(const char *file)
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struct thread *td = curthread;
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int error, flags, vfslocked;
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fd = td->td_proc->p_fd;
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if (fd->fd_rdir == NULL) {
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fd->fd_rdir = rootvnode;
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if (fd->fd_cdir == NULL) {
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fd->fd_cdir = rootvnode;
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flags = FREAD | O_NOFOLLOW;
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NDINIT(&nd, LOOKUP, MPSAFE, UIO_SYSSPACE, file, td);
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error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL);
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vfslocked = NDHASGIANT(&nd);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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/* We just unlock so we hold a reference. */
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VOP_UNLOCK(nd.ni_vp, 0);
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VFS_UNLOCK_GIANT(vfslocked);
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kobj_open_file_loader(const char *file)
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return (preload_search_by_name(file));
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kobj_open_file(const char *file)
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out = kmem_alloc(sizeof(*out), KM_SLEEP);
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out->mounted = root_mounted();
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* If root is already mounted we read file using file system,
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* if not, we use loader.
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out->ptr = kobj_open_file_vnode(file);
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out->ptr = kobj_open_file_loader(file);
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if (out->ptr == NULL) {
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kmem_free(out, sizeof(*out));
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return ((struct _buf *)-1);
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kobj_get_filesize_vnode(struct _buf *file, uint64_t *size)
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struct vnode *vp = file->ptr;
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int error, vfslocked;
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vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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vn_lock(vp, LK_SHARED | LK_RETRY);
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error = VOP_GETATTR(vp, &va, curthread->td_ucred);
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*size = (uint64_t)va.va_size;
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VFS_UNLOCK_GIANT(vfslocked);
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kobj_get_filesize_loader(struct _buf *file, uint64_t *size)
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ptr = preload_search_info(file->ptr, MODINFO_SIZE);
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*size = (uint64_t)*(size_t *)ptr;
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kobj_get_filesize(struct _buf *file, uint64_t *size)
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return (kobj_get_filesize_vnode(file, size));
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return (kobj_get_filesize_loader(file, size));
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kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off)
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struct vnode *vp = file->ptr;
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struct thread *td = curthread;
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int error, vfslocked;
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bzero(&aiov, sizeof(aiov));
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bzero(&auio, sizeof(auio));
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auio.uio_iov = &aiov;
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auio.uio_offset = (off_t)off;
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auio.uio_segflg = UIO_SYSSPACE;
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auio.uio_rw = UIO_READ;
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auio.uio_resid = size;
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vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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vn_lock(vp, LK_SHARED | LK_RETRY);
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error = VOP_READ(vp, &auio, IO_UNIT | IO_SYNC, td->td_ucred);
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VFS_UNLOCK_GIANT(vfslocked);
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return (error != 0 ? -1 : size - auio.uio_resid);
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kobj_read_file_loader(struct _buf *file, char *buf, unsigned size, unsigned off)
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ptr = preload_fetch_addr(file->ptr);
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bcopy(ptr + off, buf, size);
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kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
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return (kobj_read_file_vnode(file, buf, size, off));
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return (kobj_read_file_loader(file, buf, size, off));
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kobj_close_file(struct _buf *file)
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struct vnode *vp = file->ptr;
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struct thread *td = curthread;
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vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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vn_close(vp, FREAD, td->td_ucred, td);
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VFS_UNLOCK_GIANT(vfslocked);
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kmem_free(file, sizeof(*file));