1 /* $NetBSD: filecore_node.c,v 1.25 2011/06/12 03:35:52 rmind 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 1.25 2011/06/12 03:35:52 rmind 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 /* 91 * Structures associated with filecore_node caching. 92 */ 93 static LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl; 94 static u_long filecorehash; 95 96 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & filecorehash) 97 98 static kmutex_t filecore_ihash_lock; 99 struct pool filecore_node_pool; 100 101 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 102 103 /* 104 * Initialize hash links for inodes and dnodes. 105 */ 106 void 107 filecore_init(void) 108 { 109 110 mutex_init(&filecore_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 111 pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0, 112 "filecrnopl", &pool_allocator_nointr, IPL_NONE); 113 filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, true, 114 &filecorehash); 115 } 116 117 /* 118 * Reinitialize inode hash table. 119 */ 120 void 121 filecore_reinit(void) 122 { 123 struct filecore_node *ip; 124 struct ihashhead *oldhash, *hash; 125 u_long oldmask, mask, val; 126 int i; 127 128 hash = hashinit(desiredvnodes, HASH_LIST, true, &mask); 129 130 mutex_enter(&filecore_ihash_lock); 131 oldhash = filecorehashtbl; 132 oldmask = filecorehash; 133 filecorehashtbl = hash; 134 filecorehash = mask; 135 for (i = 0; i <= oldmask; i++) { 136 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { 137 LIST_REMOVE(ip, i_hash); 138 val = INOHASH(ip->i_dev, ip->i_number); 139 LIST_INSERT_HEAD(&hash[val], ip, i_hash); 140 } 141 } 142 mutex_exit(&filecore_ihash_lock); 143 hashdone(oldhash, HASH_LIST, oldmask); 144 } 145 146 /* 147 * Destroy node pool and hash table. 148 */ 149 void 150 filecore_done(void) 151 { 152 153 hashdone(filecorehashtbl, HASH_LIST, filecorehash); 154 pool_destroy(&filecore_node_pool); 155 mutex_destroy(&filecore_ihash_lock); 156 } 157 158 /* 159 * Use the device/inum pair to find the incore inode, and return a pointer 160 * to it. If it is in core, but locked, wait for it. 161 */ 162 struct vnode * 163 filecore_ihashget(dev_t dev, ino_t inum) 164 { 165 struct filecore_node *ip; 166 struct vnode *vp; 167 168 loop: 169 mutex_enter(&filecore_ihash_lock); 170 LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) { 171 if (inum == ip->i_number && dev == ip->i_dev) { 172 vp = ITOV(ip); 173 mutex_enter(vp->v_interlock); 174 mutex_exit(&filecore_ihash_lock); 175 if (vget(vp, LK_EXCLUSIVE)) 176 goto loop; 177 return (vp); 178 } 179 } 180 mutex_exit(&filecore_ihash_lock); 181 return (NULL); 182 } 183 184 /* 185 * Insert the inode into the hash table, and return it locked. 186 */ 187 void 188 filecore_ihashins(struct filecore_node *ip) 189 { 190 struct ihashhead *ipp; 191 192 mutex_enter(&filecore_ihash_lock); 193 ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)]; 194 LIST_INSERT_HEAD(ipp, ip, i_hash); 195 mutex_exit(&filecore_ihash_lock); 196 197 VOP_LOCK(ITOV(ip), LK_EXCLUSIVE); 198 } 199 200 /* 201 * Remove the inode from the hash table. 202 */ 203 void 204 filecore_ihashrem(struct filecore_node *ip) 205 { 206 mutex_enter(&filecore_ihash_lock); 207 LIST_REMOVE(ip, i_hash); 208 mutex_exit(&filecore_ihash_lock); 209 } 210 211 /* 212 * Last reference to an inode, write the inode out and if necessary, 213 * truncate and deallocate the file. 214 */ 215 int 216 filecore_inactive(void *v) 217 { 218 struct vop_inactive_args /* { 219 struct vnode *a_vp; 220 bool *a_recycle; 221 } */ *ap = v; 222 struct vnode *vp = ap->a_vp; 223 struct filecore_node *ip = VTOI(vp); 224 int error = 0; 225 226 /* 227 * If we are done with the inode, reclaim it 228 * so that it can be reused immediately. 229 */ 230 ip->i_flag = 0; 231 *ap->a_recycle = (filecore_staleinode(ip) != 0); 232 VOP_UNLOCK(vp); 233 return error; 234 } 235 236 /* 237 * Reclaim an inode so that it can be used for other purposes. 238 */ 239 int 240 filecore_reclaim(void *v) 241 { 242 struct vop_reclaim_args /* { 243 struct vnode *a_vp; 244 struct lwp *a_l; 245 } */ *ap = v; 246 struct vnode *vp = ap->a_vp; 247 struct filecore_node *ip = VTOI(vp); 248 249 if (prtactive && vp->v_usecount > 1) 250 vprint("filecore_reclaim: pushing active", vp); 251 /* 252 * Remove the inode from its hash chain. 253 */ 254 filecore_ihashrem(ip); 255 /* 256 * Purge old data structures associated with the inode. 257 */ 258 if (ip->i_devvp) { 259 vrele(ip->i_devvp); 260 ip->i_devvp = 0; 261 } 262 genfs_node_destroy(vp); 263 pool_put(&filecore_node_pool, vp->v_data); 264 vp->v_data = NULL; 265 return (0); 266 } 267