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tmpfs_fifoops.c revision 1.12 
      1 /*	$NetBSD: tmpfs_fifoops.c,v 1.12 2020/05/16 18:31:49 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
      9  * 2005 program.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * tmpfs vnode interface for named pipes.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_fifoops.c,v 1.12 2020/05/16 18:31:49 christos Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/vnode.h>
     42 
     43 #include <fs/tmpfs/tmpfs.h>
     44 #include <fs/tmpfs/tmpfs_fifoops.h>
     45 
     46 /*
     47  * vnode operations vector used for fifos stored in a tmpfs file system.
     48  */
     49 int (**tmpfs_fifoop_p)(void *);
     50 const struct vnodeopv_entry_desc tmpfs_fifoop_entries[] = {
     51 	{ &vop_default_desc,		vn_default_error },
     52 	{ &vop_lookup_desc,		tmpfs_fifo_lookup },
     53 	{ &vop_create_desc,		tmpfs_fifo_create },
     54 	{ &vop_mknod_desc,		tmpfs_fifo_mknod },
     55 	{ &vop_open_desc,		tmpfs_fifo_open },
     56 	{ &vop_close_desc,		tmpfs_fifo_close },
     57 	{ &vop_access_desc,		tmpfs_fifo_access },
     58 	{ &vop_accessx_desc,		genfs_accessx },
     59 	{ &vop_getattr_desc,		tmpfs_fifo_getattr },
     60 	{ &vop_setattr_desc,		tmpfs_fifo_setattr },
     61 	{ &vop_read_desc,		tmpfs_fifo_read },
     62 	{ &vop_write_desc,		tmpfs_fifo_write },
     63 	{ &vop_fallocate_desc,		vn_fifo_bypass },
     64 	{ &vop_fdiscard_desc,		vn_fifo_bypass },
     65 	{ &vop_ioctl_desc,		tmpfs_fifo_ioctl },
     66 	{ &vop_fcntl_desc,		tmpfs_fifo_fcntl },
     67 	{ &vop_poll_desc,		tmpfs_fifo_poll },
     68 	{ &vop_kqfilter_desc,		tmpfs_fifo_kqfilter },
     69 	{ &vop_revoke_desc,		tmpfs_fifo_revoke },
     70 	{ &vop_mmap_desc,		tmpfs_fifo_mmap },
     71 	{ &vop_fsync_desc,		tmpfs_fifo_fsync },
     72 	{ &vop_seek_desc,		tmpfs_fifo_seek },
     73 	{ &vop_remove_desc,		tmpfs_fifo_remove },
     74 	{ &vop_link_desc,		tmpfs_fifo_link },
     75 	{ &vop_rename_desc,		tmpfs_fifo_rename },
     76 	{ &vop_mkdir_desc,		tmpfs_fifo_mkdir },
     77 	{ &vop_rmdir_desc,		tmpfs_fifo_rmdir },
     78 	{ &vop_symlink_desc,		tmpfs_fifo_symlink },
     79 	{ &vop_readdir_desc,		tmpfs_fifo_readdir },
     80 	{ &vop_readlink_desc,		tmpfs_fifo_readlink },
     81 	{ &vop_abortop_desc,		tmpfs_fifo_abortop },
     82 	{ &vop_inactive_desc,		tmpfs_fifo_inactive },
     83 	{ &vop_reclaim_desc,		tmpfs_fifo_reclaim },
     84 	{ &vop_lock_desc,		tmpfs_fifo_lock },
     85 	{ &vop_unlock_desc,		tmpfs_fifo_unlock },
     86 	{ &vop_bmap_desc,		tmpfs_fifo_bmap },
     87 	{ &vop_strategy_desc,		tmpfs_fifo_strategy },
     88 	{ &vop_print_desc,		tmpfs_fifo_print },
     89 	{ &vop_pathconf_desc,		tmpfs_fifo_pathconf },
     90 	{ &vop_islocked_desc,		tmpfs_fifo_islocked },
     91 	{ &vop_advlock_desc,		tmpfs_fifo_advlock },
     92 	{ &vop_bwrite_desc,		tmpfs_fifo_bwrite },
     93 	{ &vop_getpages_desc,		tmpfs_fifo_getpages },
     94 	{ &vop_putpages_desc,		tmpfs_fifo_putpages },
     95 	{ NULL, NULL }
     96 };
     97 
     98 const struct vnodeopv_desc tmpfs_fifoop_opv_desc = {
     99 	&tmpfs_fifoop_p, tmpfs_fifoop_entries
    100 };
    101 
    102 int
    103 tmpfs_fifo_close(void *v)
    104 {
    105 	struct vop_close_args /* {
    106 		struct vnode	*a_vp;
    107 		int		a_fflag;
    108 		kauth_cred_t	a_cred;
    109 	} */ *ap __unused = v;
    110 
    111 	return VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), v);
    112 }
    113 
    114 int
    115 tmpfs_fifo_read(void *v)
    116 {
    117 	struct vop_read_args /* {
    118 		struct vnode *a_vp;
    119 		struct uio *a_uio;
    120 		int a_ioflag;
    121 		kauth_cred_t a_cred;
    122 	} */ *ap = v;
    123 	vnode_t *vp = ap->a_vp;
    124 
    125 	tmpfs_update(vp, TMPFS_UPDATE_ATIME);
    126 	return VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), v);
    127 }
    128 
    129 int
    130 tmpfs_fifo_write(void *v)
    131 {
    132 	struct vop_write_args /* {
    133 		struct vnode *a_vp;
    134 		struct uio *a_uio;
    135 		int a_ioflag;
    136 		kauth_cred_t a_cred;
    137 	} */ *ap = v;
    138 	vnode_t *vp = ap->a_vp;
    139 
    140 	tmpfs_update(vp, TMPFS_UPDATE_MTIME);
    141 	return VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), v);
    142 }
    143