diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/file.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/file.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/file.h b/sys/compat/linuxkpi/common/include/linux/file.h new file mode 100644 index 000000000000..b23c9714b92a --- /dev/null +++ b/sys/compat/linuxkpi/common/include/linux/file.h @@ -0,0 +1,160 @@ +/*- + * Copyright (c) 2010 Isilon Systems, Inc. + * Copyright (c) 2010 iX Systems, Inc. + * Copyright (c) 2010 Panasas, Inc. + * Copyright (c) 2013 Mellanox Technologies, Ltd. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ +#ifndef _LINUX_FILE_H_ +#define _LINUX_FILE_H_ + +#include <sys/param.h> +#include <sys/file.h> +#include <sys/filedesc.h> +#include <sys/refcount.h> +#include <sys/capsicum.h> +#include <sys/proc.h> + +#include <linux/fs.h> + +struct linux_file; + +#undef file + +extern struct fileops linuxfileops; + +static inline struct linux_file * +linux_fget(unsigned int fd) +{ + cap_rights_t rights; + struct file *file; + + if (fget_unlocked(curthread->td_proc->p_fd, fd, + cap_rights_init(&rights), &file, NULL) != 0) { + return (NULL); + } + return (struct linux_file *)file->f_data; +} + +static inline void +fput(struct linux_file *filp) +{ + if (filp->_file == NULL) { + kfree(filp); + return; + } + if (refcount_release(&filp->_file->f_count)) { + _fdrop(filp->_file, curthread); + kfree(filp); + } +} + +static inline void +put_unused_fd(unsigned int fd) +{ + cap_rights_t rights; + struct file *file; + + if (fget_unlocked(curthread->td_proc->p_fd, fd, + cap_rights_init(&rights), &file, NULL) != 0) { + return; + } + /* + * NOTE: We should only get here when the "fd" has not been + * installed, so no need to free the associated Linux file + * structure. + */ + fdclose(curthread, file, fd); + + /* drop extra reference */ + fdrop(file, curthread); +} + +static inline void +fd_install(unsigned int fd, struct linux_file *filp) +{ + cap_rights_t rights; + struct file *file; + + if (fget_unlocked(curthread->td_proc->p_fd, fd, + cap_rights_init(&rights), &file, NULL) != 0) { + file = NULL; + } + filp->_file = file; + finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops); + + /* drop the extra reference */ + fput(filp); +} + +static inline int +get_unused_fd(void) +{ + struct file *file; + int error; + int fd; + + error = falloc(curthread, &file, &fd, 0); + if (error) + return -error; + /* drop the extra reference */ + fdrop(file, curthread); + return fd; +} + +static inline struct linux_file * +alloc_file(int mode, const struct file_operations *fops) +{ + struct linux_file *filp; + + filp = kzalloc(sizeof(*filp), GFP_KERNEL); + if (filp == NULL) + return (NULL); + filp->f_op = fops; + filp->f_mode = mode; + + return filp; +} + +struct fd { + struct linux_file *linux_file; +}; + +static inline void fdput(struct fd fd) +{ + fput(fd.linux_file); +} + +static inline struct fd fdget(unsigned int fd) +{ + struct linux_file *f = linux_fget(fd); + return (struct fd){f}; +} + +#define file linux_file +#define fget linux_fget + +#endif /* _LINUX_FILE_H_ */ |