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filecore_node.c revision 1.1
      1 /*	$NetBSD: filecore_node.c,v 1.1 2002/12/23 17:30:40 jdolecek Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 Andrew McMurry
      5  * Copyright (c) 1982, 1986, 1989, 1994
      6  *           The Regents of the University of California.
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	filecore_node.c		1.0	1998/6/4
     38  */
     39 
     40 #include <sys/cdefs.h>
     41 __KERNEL_RCSID(0, "$NetBSD: filecore_node.c,v 1.1 2002/12/23 17:30:40 jdolecek Exp $");
     42 
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/mount.h>
     46 #include <sys/proc.h>
     47 #include <sys/file.h>
     48 #include <sys/buf.h>
     49 #include <sys/vnode.h>
     50 #include <sys/namei.h>
     51 #include <sys/kernel.h>
     52 #include <sys/malloc.h>
     53 #include <sys/pool.h>
     54 #include <sys/stat.h>
     55 
     56 #include <fs/filecorefs/filecore.h>
     57 #include <fs/filecorefs/filecore_extern.h>
     58 #include <fs/filecorefs/filecore_node.h>
     59 #include <fs/filecorefs/filecore_mount.h>
     60 
     61 /*
     62  * Structures associated with filecore_node caching.
     63  */
     64 LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl;
     65 u_long filecorehash;
     66 #define	INOHASH(device, inum)	(((device) + ((inum)>>12)) & filecorehash)
     67 struct simplelock filecore_ihash_slock;
     68 
     69 struct pool filecore_node_pool;
     70 
     71 extern int prtactive;	/* 1 => print out reclaim of active vnodes */
     72 
     73 /*
     74  * Initialize hash links for inodes and dnodes.
     75  */
     76 void
     77 filecore_init()
     78 {
     79 	filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT,
     80 	    M_WAITOK, &filecorehash);
     81 	simple_lock_init(&filecore_ihash_slock);
     82 	pool_init(&filecore_node_pool, sizeof(struct filecore_node),
     83 	    0, 0, 0, "filecrnopl", &pool_allocator_nointr);
     84 }
     85 
     86 /*
     87  * Reinitialize inode hash table.
     88  */
     89 void
     90 filecore_reinit()
     91 {
     92 	struct filecore_node *ip;
     93 	struct ihashhead *oldhash, *hash;
     94 	u_long oldmask, mask, val;
     95 	int i;
     96 
     97 	hash = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT, M_WAITOK,
     98 	    &mask);
     99 
    100 	simple_lock(&filecore_ihash_slock);
    101 	oldhash = filecorehashtbl;
    102 	oldmask = filecorehash;
    103 	filecorehashtbl = hash;
    104 	filecorehash = mask;
    105 	for (i = 0; i <= oldmask; i++) {
    106 		while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
    107 			LIST_REMOVE(ip, i_hash);
    108 			val = INOHASH(ip->i_dev, ip->i_number);
    109 			LIST_INSERT_HEAD(&hash[val], ip, i_hash);
    110 		}
    111 	}
    112 	simple_unlock(&filecore_ihash_slock);
    113 	hashdone(oldhash, M_FILECOREMNT);
    114 }
    115 
    116 /*
    117  * Destroy node pool and hash table.
    118  */
    119 void
    120 filecore_done()
    121 {
    122 	pool_destroy(&filecore_node_pool);
    123 	hashdone(filecorehashtbl, M_FILECOREMNT);
    124 }
    125 
    126 /*
    127  * Use the device/inum pair to find the incore inode, and return a pointer
    128  * to it. If it is in core, but locked, wait for it.
    129  */
    130 struct vnode *
    131 filecore_ihashget(dev, inum)
    132 	dev_t dev;
    133 	ino_t inum;
    134 {
    135 	struct filecore_node *ip;
    136 	struct vnode *vp;
    137 
    138 loop:
    139 	simple_lock(&filecore_ihash_slock);
    140 	LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) {
    141 		if (inum == ip->i_number && dev == ip->i_dev) {
    142 			vp = ITOV(ip);
    143 			simple_lock(&vp->v_interlock);
    144 			simple_unlock(&filecore_ihash_slock);
    145 			if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
    146 				goto loop;
    147 			return (vp);
    148 		}
    149 	}
    150 	simple_unlock(&filecore_ihash_slock);
    151 	return (NULL);
    152 }
    153 
    154 /*
    155  * Insert the inode into the hash table, and return it locked.
    156  */
    157 void
    158 filecore_ihashins(ip)
    159 	struct filecore_node *ip;
    160 {
    161 	struct ihashhead *ipp;
    162 	struct vnode *vp;
    163 
    164 	simple_lock(&filecore_ihash_slock);
    165 	ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)];
    166 	LIST_INSERT_HEAD(ipp, ip, i_hash);
    167 	simple_unlock(&filecore_ihash_slock);
    168 
    169 	vp = ip->i_vnode;
    170 	lockmgr(&vp->v_lock, LK_EXCLUSIVE, &vp->v_interlock);
    171 }
    172 
    173 /*
    174  * Remove the inode from the hash table.
    175  */
    176 void
    177 filecore_ihashrem(ip)
    178 	struct filecore_node *ip;
    179 {
    180 	simple_lock(&filecore_ihash_slock);
    181 	LIST_REMOVE(ip, i_hash);
    182 	simple_unlock(&filecore_ihash_slock);
    183 }
    184 
    185 /*
    186  * Last reference to an inode, write the inode out and if necessary,
    187  * truncate and deallocate the file.
    188  */
    189 int
    190 filecore_inactive(v)
    191 	void *v;
    192 {
    193 	struct vop_inactive_args /* {
    194 		struct vnode *a_vp;
    195 		struct proc *a_p;
    196 	} */ *ap = v;
    197 	struct vnode *vp = ap->a_vp;
    198 	struct proc *p = ap->a_p;
    199 	struct filecore_node *ip = VTOI(vp);
    200 	int error = 0;
    201 
    202 	if (prtactive && vp->v_usecount != 0)
    203 		vprint("filecore_inactive: pushing active", vp);
    204 
    205 	ip->i_flag = 0;
    206 	VOP_UNLOCK(vp, 0);
    207 	/*
    208 	 * If we are done with the inode, reclaim it
    209 	 * so that it can be reused immediately.
    210 	 */
    211 	if (filecore_staleinode(ip))
    212 		vrecycle(vp, (struct simplelock *)0, p);
    213 	return error;
    214 }
    215 
    216 /*
    217  * Reclaim an inode so that it can be used for other purposes.
    218  */
    219 int
    220 filecore_reclaim(v)
    221 	void *v;
    222 {
    223 	struct vop_reclaim_args /* {
    224 		struct vnode *a_vp;
    225 		struct proc *a_p;
    226 	} */ *ap = v;
    227 	struct vnode *vp = ap->a_vp;
    228 	struct filecore_node *ip = VTOI(vp);
    229 
    230 	if (prtactive && vp->v_usecount != 0)
    231 		vprint("filecore_reclaim: pushing active", vp);
    232 	/*
    233 	 * Remove the inode from its hash chain.
    234 	 */
    235 	filecore_ihashrem(ip);
    236 	/*
    237 	 * Purge old data structures associated with the inode.
    238 	 */
    239 	cache_purge(vp);
    240 	if (ip->i_devvp) {
    241 		vrele(ip->i_devvp);
    242 		ip->i_devvp = 0;
    243 	}
    244 	pool_put(&filecore_node_pool, vp->v_data);
    245 	vp->v_data = NULL;
    246 	return (0);
    247 }
    248