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tmpfs_specops.c revision 1.13 
      1 /*	$NetBSD: tmpfs_specops.c,v 1.13 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 special devices.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_specops.c,v 1.13 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_specops.h>
     45 
     46 /*
     47  * vnode operations vector used for special devices stored in a tmpfs
     48  * file system.
     49  */
     50 
     51 int (**tmpfs_specop_p)(void *);
     52 
     53 const struct vnodeopv_entry_desc tmpfs_specop_entries[] = {
     54 	{ &vop_default_desc,		vn_default_error },
     55 	{ &vop_lookup_desc,		tmpfs_spec_lookup },
     56 	{ &vop_create_desc,		tmpfs_spec_create },
     57 	{ &vop_mknod_desc,		tmpfs_spec_mknod },
     58 	{ &vop_open_desc,		tmpfs_spec_open },
     59 	{ &vop_close_desc,		tmpfs_spec_close },
     60 	{ &vop_access_desc,		tmpfs_spec_access },
     61 	{ &vop_accessx_desc,		genfs_accessx },
     62 	{ &vop_getattr_desc,		tmpfs_spec_getattr },
     63 	{ &vop_setattr_desc,		tmpfs_spec_setattr },
     64 	{ &vop_read_desc,		tmpfs_spec_read },
     65 	{ &vop_write_desc,		tmpfs_spec_write },
     66 	{ &vop_fallocate_desc,		spec_fallocate },
     67 	{ &vop_fdiscard_desc,		spec_fdiscard },
     68 	{ &vop_ioctl_desc,		tmpfs_spec_ioctl },
     69 	{ &vop_fcntl_desc,		tmpfs_spec_fcntl },
     70 	{ &vop_poll_desc,		tmpfs_spec_poll },
     71 	{ &vop_kqfilter_desc,		tmpfs_spec_kqfilter },
     72 	{ &vop_revoke_desc,		tmpfs_spec_revoke },
     73 	{ &vop_mmap_desc,		tmpfs_spec_mmap },
     74 	{ &vop_fsync_desc,		tmpfs_spec_fsync },
     75 	{ &vop_seek_desc,		tmpfs_spec_seek },
     76 	{ &vop_remove_desc,		tmpfs_spec_remove },
     77 	{ &vop_link_desc,		tmpfs_spec_link },
     78 	{ &vop_rename_desc,		tmpfs_spec_rename },
     79 	{ &vop_mkdir_desc,		tmpfs_spec_mkdir },
     80 	{ &vop_rmdir_desc,		tmpfs_spec_rmdir },
     81 	{ &vop_symlink_desc,		tmpfs_spec_symlink },
     82 	{ &vop_readdir_desc,		tmpfs_spec_readdir },
     83 	{ &vop_readlink_desc,		tmpfs_spec_readlink },
     84 	{ &vop_abortop_desc,		tmpfs_spec_abortop },
     85 	{ &vop_inactive_desc,		tmpfs_spec_inactive },
     86 	{ &vop_reclaim_desc,		tmpfs_spec_reclaim },
     87 	{ &vop_lock_desc,		tmpfs_spec_lock },
     88 	{ &vop_unlock_desc,		tmpfs_spec_unlock },
     89 	{ &vop_bmap_desc,		tmpfs_spec_bmap },
     90 	{ &vop_strategy_desc,		tmpfs_spec_strategy },
     91 	{ &vop_print_desc,		tmpfs_spec_print },
     92 	{ &vop_pathconf_desc,		tmpfs_spec_pathconf },
     93 	{ &vop_islocked_desc,		tmpfs_spec_islocked },
     94 	{ &vop_advlock_desc,		tmpfs_spec_advlock },
     95 	{ &vop_bwrite_desc,		tmpfs_spec_bwrite },
     96 	{ &vop_getpages_desc,		tmpfs_spec_getpages },
     97 	{ &vop_putpages_desc,		tmpfs_spec_putpages },
     98 	{ NULL, NULL }
     99 };
    100 
    101 const struct vnodeopv_desc tmpfs_specop_opv_desc = {
    102 	&tmpfs_specop_p, tmpfs_specop_entries
    103 };
    104 
    105 int
    106 tmpfs_spec_close(void *v)
    107 {
    108 	struct vop_close_args /* {
    109 		struct vnode	*a_vp;
    110 		int		a_fflag;
    111 		kauth_cred_t	a_cred;
    112 	} */ *ap __unused = v;
    113 
    114 	return VOCALL(spec_vnodeop_p, VOFFSET(vop_close), v);
    115 }
    116 
    117 int
    118 tmpfs_spec_read(void *v)
    119 {
    120 	struct vop_read_args /* {
    121 		struct vnode *a_vp;
    122 		struct uio *a_uio;
    123 		int a_ioflag;
    124 		kauth_cred_t a_cred;
    125 	} */ *ap = v;
    126 	vnode_t *vp = ap->a_vp;
    127 
    128 	tmpfs_update(vp, TMPFS_UPDATE_ATIME);
    129 	return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v);
    130 }
    131 
    132 int
    133 tmpfs_spec_write(void *v)
    134 {
    135 	struct vop_write_args /* {
    136 		struct vnode *a_vp;
    137 		struct uio *a_uio;
    138 		int a_ioflag;
    139 		kauth_cred_t a_cred;
    140 	} */ *ap = v;
    141 	vnode_t *vp = ap->a_vp;
    142 
    143 	tmpfs_update(vp, TMPFS_UPDATE_MTIME);
    144 	return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v);
    145 }
    146