1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 #pragma ident "%Z%%M% %I% %E% SMI" 26 27 #include <sys/param.h> 28 #include <sys/types.h> 29 #include <sys/systm.h> 30 #include <sys/cred.h> 31 #include <sys/proc.h> 32 #include <sys/user.h> 33 #include <sys/vfs.h> 34 #include <sys/vnode.h> 35 #include <sys/pathname.h> 36 #include <sys/uio.h> 37 #include <sys/tiuser.h> 38 #include <sys/sysmacros.h> 39 #include <sys/kmem.h> 40 #include <sys/mount.h> 41 #include <sys/ioctl.h> 42 #include <sys/statvfs.h> 43 #include <sys/errno.h> 44 #include <sys/debug.h> 45 #include <sys/cmn_err.h> 46 #include <sys/utsname.h> 47 #include <sys/bootconf.h> 48 #include <sys/modctl.h> 49 50 #include <sys/fs/cachefs_fs.h> 51 52 /*ARGSUSED*/ 53 static int 54 c_nop_init_cached_object(fscache_t *fscp, cnode_t *cp, vattr_t *vap, 55 cred_t *cr) 56 { 57 int error; 58 cachefs_metadata_t *mdp = &cp->c_metadata; 59 60 ASSERT(cr != NULL); 61 ASSERT(MUTEX_HELD(&cp->c_statelock)); 62 63 /* NFSv4 always sets strict consistency */ 64 ASSERT(CFS_ISFS_BACKFS_NFSV4(fscp) == 0); 65 66 /* if attributes not passed in then get them */ 67 if (vap == NULL) { 68 /* if not connected then cannot get attrs */ 69 if ((fscp->fs_cdconnected != CFS_CD_CONNECTED) || 70 (fscp->fs_backvfsp == NULL)) 71 return (ETIMEDOUT); 72 73 /* get backvp if necessary */ 74 if (cp->c_backvp == NULL) { 75 error = cachefs_getbackvp(fscp, cp); 76 if (error) 77 return (error); 78 } 79 80 /* get the attributes */ 81 cp->c_attr.va_mask = AT_ALL; 82 ASSERT(cp->c_backvp != NULL); 83 error = VOP_GETATTR(cp->c_backvp, &cp->c_attr, 0, cr, NULL); 84 if (error) 85 return (error); 86 } else { 87 /* copy passed in attributes into the cnode */ 88 cp->c_attr = *vap; 89 } 90 91 cp->c_size = cp->c_attr.va_size; 92 mdp->md_consttype = CFS_FS_CONST_NOCONST; 93 cp->c_flags |= CN_UPDATED; 94 return (0); 95 } 96 97 /*ARGSUSED*/ 98 static int 99 c_nop_check_cached_object(struct fscache *fscp, struct cnode *cp, 100 int verify_what, cred_t *cr) 101 { 102 struct vattr attrs; 103 int fail = 0, backhit = 0; 104 int error = 0; 105 cachefs_metadata_t *mdp = &cp->c_metadata; 106 107 ASSERT(cr); 108 ASSERT(MUTEX_HELD(&cp->c_statelock)); 109 110 /* nothing to do if not connected */ 111 if ((fscp->fs_cdconnected != CFS_CD_CONNECTED) || 112 (fscp->fs_backvfsp == NULL)) 113 goto out; 114 115 /* done if do not have to check */ 116 if (((verify_what & C_BACK_CHECK) == 0) && 117 ((mdp->md_flags & MD_NEEDATTRS) == 0)) 118 goto out; 119 120 /* get backvp if necessary */ 121 if (cp->c_backvp == NULL) { 122 error = cachefs_getbackvp(fscp, cp); 123 if (error) 124 goto out; 125 } 126 127 /* get the file attributes from the back fs */ 128 attrs.va_mask = AT_ALL; 129 error = VOP_GETATTR(cp->c_backvp, &attrs, 0, cr, NULL); 130 backhit = 1; 131 if (error) 132 goto out; 133 134 cp->c_attr = attrs; 135 if (attrs.va_size > cp->c_size) 136 cp->c_size = attrs.va_size; 137 mdp->md_flags &= ~MD_NEEDATTRS; 138 cachefs_cnode_setlocalstats(cp); 139 cp->c_flags |= CN_UPDATED; 140 141 out: 142 if (backhit != 0) { 143 if (fail != 0) 144 fscp->fs_stats.st_fails++; 145 else 146 fscp->fs_stats.st_passes++; 147 } 148 149 return (error); 150 } 151 152 static void 153 c_nop_modify_cached_object(struct fscache *fscp, struct cnode *cp, cred_t *cr) 154 { 155 struct vattr attrs; 156 int error; 157 nlink_t nlink; 158 cachefs_metadata_t *mdp = &cp->c_metadata; 159 160 ASSERT(MUTEX_HELD(&cp->c_statelock)); 161 ASSERT(fscp->fs_cdconnected == CFS_CD_CONNECTED); 162 ASSERT(fscp->fs_backvfsp); 163 164 fscp->fs_stats.st_modifies++; 165 166 /* from now on, make sure we're using the server's idea of time */ 167 mdp->md_flags &= ~(MD_LOCALCTIME | MD_LOCALMTIME); 168 mdp->md_flags |= MD_NEEDATTRS; 169 170 /* if in write-around mode, make sure file is nocached */ 171 if (CFS_ISFS_WRITE_AROUND(fscp)) { 172 if ((cp->c_flags & CN_NOCACHE) == 0) 173 cachefs_nocache(cp); 174 } 175 176 /* get the new attributes so we don't wait forever to get them */ 177 if (cp->c_backvp == NULL) { 178 error = cachefs_getbackvp(fscp, cp); 179 if (error) 180 return; 181 } 182 attrs.va_mask = AT_ALL; 183 error = VOP_GETATTR(cp->c_backvp, &attrs, 0, cr, NULL); 184 if (error) 185 return; 186 nlink = cp->c_attr.va_nlink; 187 cp->c_attr = attrs; 188 cp->c_attr.va_nlink = nlink; 189 if ((attrs.va_size > cp->c_size) || !vn_has_cached_data(CTOV(cp))) 190 cp->c_size = attrs.va_size; 191 mdp->md_flags &= ~MD_NEEDATTRS; 192 cachefs_cnode_setlocalstats(cp); 193 cp->c_flags |= CN_UPDATED; 194 } 195 196 /*ARGSUSED*/ 197 static void 198 c_nop_invalidate_cached_object(struct fscache *fscp, struct cnode *cp, 199 cred_t *cr) 200 { 201 cachefs_metadata_t *mdp = &cp->c_metadata; 202 203 ASSERT(MUTEX_HELD(&cp->c_statelock)); 204 mdp->md_flags |= MD_NEEDATTRS; 205 cp->c_flags |= CN_UPDATED; 206 } 207 208 /*ARGSUSED*/ 209 static void 210 c_nop_convert_cached_object(struct fscache *fscp, struct cnode *cp, 211 cred_t *cr) 212 { 213 cachefs_metadata_t *mdp = &cp->c_metadata; 214 mdp->md_flags |= MD_NEEDATTRS; 215 mdp->md_consttype = CFS_FS_CONST_NOCONST; 216 cp->c_flags |= CN_UPDATED; 217 } 218 219 struct cachefsops nopcfsops = { 220 c_nop_init_cached_object, 221 c_nop_check_cached_object, 222 c_nop_modify_cached_object, 223 c_nop_invalidate_cached_object, 224 c_nop_convert_cached_object 225 }; 226