1 /* $NetBSD: filecore_node.c,v 1.19 2009/03/15 22:16:50 cegger 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 1.19 2009/03/15 22:16:50 cegger 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/malloc.h> 82 #include <sys/pool.h> 83 #include <sys/stat.h> 84 #include <sys/simplelock.h> 85 86 #include <fs/filecorefs/filecore.h> 87 #include <fs/filecorefs/filecore_extern.h> 88 #include <fs/filecorefs/filecore_node.h> 89 #include <fs/filecorefs/filecore_mount.h> 90 91 /* 92 * Structures associated with filecore_node caching. 93 */ 94 LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl; 95 u_long filecorehash; 96 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & filecorehash) 97 struct simplelock filecore_ihash_slock; 98 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 malloc_type_attach(M_FILECOREMNT); 111 malloc_type_attach(M_FILECORETMP); 112 pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0, 113 "filecrnopl", &pool_allocator_nointr, IPL_NONE); 114 filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, true, 115 &filecorehash); 116 simple_lock_init(&filecore_ihash_slock); 117 } 118 119 /* 120 * Reinitialize inode hash table. 121 */ 122 void 123 filecore_reinit(void) 124 { 125 struct filecore_node *ip; 126 struct ihashhead *oldhash, *hash; 127 u_long oldmask, mask, val; 128 int i; 129 130 hash = hashinit(desiredvnodes, HASH_LIST, true, &mask); 131 132 simple_lock(&filecore_ihash_slock); 133 oldhash = filecorehashtbl; 134 oldmask = filecorehash; 135 filecorehashtbl = hash; 136 filecorehash = mask; 137 for (i = 0; i <= oldmask; i++) { 138 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) { 139 LIST_REMOVE(ip, i_hash); 140 val = INOHASH(ip->i_dev, ip->i_number); 141 LIST_INSERT_HEAD(&hash[val], ip, i_hash); 142 } 143 } 144 simple_unlock(&filecore_ihash_slock); 145 hashdone(oldhash, HASH_LIST, oldmask); 146 } 147 148 /* 149 * Destroy node pool and hash table. 150 */ 151 void 152 filecore_done(void) 153 { 154 hashdone(filecorehashtbl, HASH_LIST, filecorehash); 155 pool_destroy(&filecore_node_pool); 156 malloc_type_detach(M_FILECORETMP); 157 malloc_type_detach(M_FILECOREMNT); 158 } 159 160 /* 161 * Use the device/inum pair to find the incore inode, and return a pointer 162 * to it. If it is in core, but locked, wait for it. 163 */ 164 struct vnode * 165 filecore_ihashget(dev_t dev, ino_t inum) 166 { 167 struct filecore_node *ip; 168 struct vnode *vp; 169 170 loop: 171 simple_lock(&filecore_ihash_slock); 172 LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) { 173 if (inum == ip->i_number && dev == ip->i_dev) { 174 vp = ITOV(ip); 175 mutex_enter(&vp->v_interlock); 176 simple_unlock(&filecore_ihash_slock); 177 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 178 goto loop; 179 return (vp); 180 } 181 } 182 simple_unlock(&filecore_ihash_slock); 183 return (NULL); 184 } 185 186 /* 187 * Insert the inode into the hash table, and return it locked. 188 */ 189 void 190 filecore_ihashins(struct filecore_node *ip) 191 { 192 struct ihashhead *ipp; 193 struct vnode *vp; 194 195 simple_lock(&filecore_ihash_slock); 196 ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)]; 197 LIST_INSERT_HEAD(ipp, ip, i_hash); 198 simple_unlock(&filecore_ihash_slock); 199 200 vp = ip->i_vnode; 201 vlockmgr(&vp->v_lock, LK_EXCLUSIVE); 202 } 203 204 /* 205 * Remove the inode from the hash table. 206 */ 207 void 208 filecore_ihashrem(struct filecore_node *ip) 209 { 210 simple_lock(&filecore_ihash_slock); 211 LIST_REMOVE(ip, i_hash); 212 simple_unlock(&filecore_ihash_slock); 213 } 214 215 /* 216 * Last reference to an inode, write the inode out and if necessary, 217 * truncate and deallocate the file. 218 */ 219 int 220 filecore_inactive(void *v) 221 { 222 struct vop_inactive_args /* { 223 struct vnode *a_vp; 224 bool *a_recycle; 225 } */ *ap = v; 226 struct vnode *vp = ap->a_vp; 227 struct filecore_node *ip = VTOI(vp); 228 int error = 0; 229 230 /* 231 * If we are done with the inode, reclaim it 232 * so that it can be reused immediately. 233 */ 234 ip->i_flag = 0; 235 *ap->a_recycle = (filecore_staleinode(ip) != 0); 236 VOP_UNLOCK(vp, 0); 237 return error; 238 } 239 240 /* 241 * Reclaim an inode so that it can be used for other purposes. 242 */ 243 int 244 filecore_reclaim(void *v) 245 { 246 struct vop_reclaim_args /* { 247 struct vnode *a_vp; 248 struct lwp *a_l; 249 } */ *ap = v; 250 struct vnode *vp = ap->a_vp; 251 struct filecore_node *ip = VTOI(vp); 252 253 if (prtactive && vp->v_usecount > 1) 254 vprint("filecore_reclaim: pushing active", vp); 255 /* 256 * Remove the inode from its hash chain. 257 */ 258 filecore_ihashrem(ip); 259 /* 260 * Purge old data structures associated with the inode. 261 */ 262 cache_purge(vp); 263 if (ip->i_devvp) { 264 vrele(ip->i_devvp); 265 ip->i_devvp = 0; 266 } 267 genfs_node_destroy(vp); 268 pool_put(&filecore_node_pool, vp->v_data); 269 vp->v_data = NULL; 270 return (0); 271 } 272