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filecore_node.c revision 1.27
      1 /*	$NetBSD: filecore_node.c,v 1.27 2014/10/04 13:27:24 hannken Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1982, 1986, 1989, 1994
      5  *           The Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  *
     32  *	filecore_node.c		1.0	1998/6/4
     33  */
     34 
     35 /*-
     36  * Copyright (c) 1998 Andrew McMurry
     37  *
     38  * Redistribution and use in source and binary forms, with or without
     39  * modification, are permitted provided that the following conditions
     40  * are met:
     41  * 1. Redistributions of source code must retain the above copyright
     42  *    notice, this list of conditions and the following disclaimer.
     43  * 2. Redistributions in binary form must reproduce the above copyright
     44  *    notice, this list of conditions and the following disclaimer in the
     45  *    documentation and/or other materials provided with the distribution.
     46  * 3. All advertising materials mentioning features or use of this software
     47  *    must display the following acknowledgement:
     48  *	This product includes software developed by the University of
     49  *	California, Berkeley and its contributors.
     50  * 4. Neither the name of the University nor the names of its contributors
     51  *    may be used to endorse or promote products derived from this software
     52  *    without specific prior written permission.
     53  *
     54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     64  * SUCH DAMAGE.
     65  *
     66  *	filecore_node.c		1.0	1998/6/4
     67  */
     68 
     69 #include <sys/cdefs.h>
     70 __KERNEL_RCSID(0, "$NetBSD: filecore_node.c,v 1.27 2014/10/04 13:27:24 hannken Exp $");
     71 
     72 #include <sys/param.h>
     73 #include <sys/systm.h>
     74 #include <sys/mount.h>
     75 #include <sys/proc.h>
     76 #include <sys/file.h>
     77 #include <sys/buf.h>
     78 #include <sys/vnode.h>
     79 #include <sys/namei.h>
     80 #include <sys/kernel.h>
     81 #include <sys/pool.h>
     82 #include <sys/stat.h>
     83 #include <sys/mutex.h>
     84 
     85 #include <fs/filecorefs/filecore.h>
     86 #include <fs/filecorefs/filecore_extern.h>
     87 #include <fs/filecorefs/filecore_node.h>
     88 #include <fs/filecorefs/filecore_mount.h>
     89 
     90 struct pool		filecore_node_pool;
     91 
     92 extern int prtactive;	/* 1 => print out reclaim of active vnodes */
     93 
     94 static const struct genfs_ops filecore_genfsops = {
     95         .gop_size = genfs_size,
     96 };
     97 
     98 /*
     99  * Initialize hash links for inodes and dnodes.
    100  */
    101 void
    102 filecore_init(void)
    103 {
    104 
    105 	pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0,
    106 	    "filecrnopl", &pool_allocator_nointr, IPL_NONE);
    107 }
    108 
    109 /*
    110  * Reinitialize inode hash table.
    111  */
    112 void
    113 filecore_reinit(void)
    114 {
    115 
    116 }
    117 
    118 /*
    119  * Destroy node pool and hash table.
    120  */
    121 void
    122 filecore_done(void)
    123 {
    124 
    125 	pool_destroy(&filecore_node_pool);
    126 }
    127 
    128 /*
    129  * Initialize this vnode / filecore node pair.
    130  * Caller assures no other thread will try to load this node.
    131  */
    132 int
    133 filecore_loadvnode(struct mount *mp, struct vnode *vp,
    134     const void *key, size_t key_len, const void **new_key)
    135 {
    136 	ino_t ino;
    137 	struct filecore_mnt *fcmp;
    138 	struct filecore_node *ip;
    139 	struct buf *bp;
    140 	int error;
    141 
    142 	KASSERT(key_len == sizeof(ino));
    143 	memcpy(&ino, key, key_len);
    144 	fcmp = VFSTOFILECORE(mp);
    145 
    146 	ip = pool_get(&filecore_node_pool, PR_WAITOK);
    147 	memset(ip, 0, sizeof(struct filecore_node));
    148 	ip->i_vnode = vp;
    149 	ip->i_dev = fcmp->fc_dev;
    150 	ip->i_number = ino;
    151 	ip->i_block = -1;
    152 	ip->i_parent = -2;
    153 
    154 	if (ino == FILECORE_ROOTINO) {
    155 		/* Here we need to construct a root directory inode */
    156 		memcpy(ip->i_dirent.name, "root", 4);
    157 		ip->i_dirent.load = 0;
    158 		ip->i_dirent.exec = 0;
    159 		ip->i_dirent.len = FILECORE_DIR_SIZE;
    160 		ip->i_dirent.addr = fcmp->drec.root;
    161 		ip->i_dirent.attr = FILECORE_ATTR_DIR | FILECORE_ATTR_READ;
    162 
    163 	} else {
    164 		/* Read in Data from Directory Entry */
    165 		if ((error = filecore_bread(fcmp, ino & FILECORE_INO_MASK,
    166 		    FILECORE_DIR_SIZE, NOCRED, &bp)) != 0) {
    167 			pool_put(&filecore_node_pool, ip);
    168 			return error;
    169 		}
    170 
    171 		memcpy(&ip->i_dirent,
    172 		    fcdirentry(bp->b_data, ino >> FILECORE_INO_INDEX),
    173 		    sizeof(struct filecore_direntry));
    174 #ifdef FILECORE_DEBUG_BR
    175 		printf("brelse(%p) vf5\n", bp);
    176 #endif
    177 		brelse(bp, 0);
    178 	}
    179 
    180 	ip->i_mnt = fcmp;
    181 	ip->i_devvp = fcmp->fc_devvp;
    182 	ip->i_diroff = 0;
    183 	vref(ip->i_devvp);
    184 
    185 	/*
    186 	 * Initialize the associated vnode
    187 	 */
    188 
    189 	vp->v_tag = VT_FILECORE;
    190 	vp->v_op = filecore_vnodeop_p;
    191 	vp->v_data = ip;
    192 	if (ip->i_dirent.attr & FILECORE_ATTR_DIR)
    193 		vp->v_type = VDIR;
    194 	else
    195 		vp->v_type = VREG;
    196 	if (ino == FILECORE_ROOTINO)
    197 		vp->v_vflag |= VV_ROOT;
    198 	genfs_node_init(vp, &filecore_genfsops);
    199 
    200 	/*
    201 	 * XXX need generation number?
    202 	 */
    203 
    204 	uvm_vnp_setsize(vp, ip->i_size);
    205 	*new_key = &ip->i_number;
    206 	return 0;
    207 }
    208 
    209 /*
    210  * Last reference to an inode, write the inode out and if necessary,
    211  * truncate and deallocate the file.
    212  */
    213 int
    214 filecore_inactive(void *v)
    215 {
    216 	struct vop_inactive_args /* {
    217 		struct vnode *a_vp;
    218 		bool *a_recycle;
    219 	} */ *ap = v;
    220 	struct vnode *vp = ap->a_vp;
    221 	struct filecore_node *ip = VTOI(vp);
    222 	int error = 0;
    223 
    224 	/*
    225 	 * If we are done with the inode, reclaim it
    226 	 * so that it can be reused immediately.
    227 	 */
    228 	ip->i_flag = 0;
    229 	*ap->a_recycle = (filecore_staleinode(ip) != 0);
    230 	VOP_UNLOCK(vp);
    231 	return error;
    232 }
    233 
    234 /*
    235  * Reclaim an inode so that it can be used for other purposes.
    236  */
    237 int
    238 filecore_reclaim(void *v)
    239 {
    240 	struct vop_reclaim_args /* {
    241 		struct vnode *a_vp;
    242 		struct lwp *a_l;
    243 	} */ *ap = v;
    244 	struct vnode *vp = ap->a_vp;
    245 	struct filecore_node *ip = VTOI(vp);
    246 
    247 	if (prtactive && vp->v_usecount > 1)
    248 		vprint("filecore_reclaim: pushing active", vp);
    249 	/*
    250 	 * Remove the inode from the vnode cache.
    251 	 */
    252 	vcache_remove(vp->v_mount, &ip->i_number, sizeof(ip->i_number));
    253 
    254 	/*
    255 	 * Purge old data structures associated with the inode.
    256 	 */
    257 	if (ip->i_devvp) {
    258 		vrele(ip->i_devvp);
    259 		ip->i_devvp = 0;
    260 	}
    261 	genfs_node_destroy(vp);
    262 	pool_put(&filecore_node_pool, vp->v_data);
    263 	vp->v_data = NULL;
    264 	return (0);
    265 }
    266