tmpfs_rename.c revision 1.2.2.2
1 1.2.2.2 yamt /* $NetBSD: tmpfs_rename.c,v 1.2.2.2 2012/05/23 10:08:09 yamt Exp $ */ 2 1.2.2.2 yamt 3 1.2.2.2 yamt /*- 4 1.2.2.2 yamt * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.2.2.2 yamt * All rights reserved. 6 1.2.2.2 yamt * 7 1.2.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 yamt * by Taylor R Campbell. 9 1.2.2.2 yamt * 10 1.2.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 yamt * modification, are permitted provided that the following conditions 12 1.2.2.2 yamt * are met: 13 1.2.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.2.2 yamt * 19 1.2.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.2.2.2 yamt */ 31 1.2.2.2 yamt 32 1.2.2.2 yamt /* 33 1.2.2.2 yamt * tmpfs rename 34 1.2.2.2 yamt */ 35 1.2.2.2 yamt 36 1.2.2.2 yamt #include <sys/cdefs.h> 37 1.2.2.2 yamt __KERNEL_RCSID(0, "$NetBSD: tmpfs_rename.c,v 1.2.2.2 2012/05/23 10:08:09 yamt Exp $"); 38 1.2.2.2 yamt 39 1.2.2.2 yamt #include <sys/param.h> 40 1.2.2.2 yamt #include <sys/errno.h> 41 1.2.2.2 yamt #include <sys/kauth.h> 42 1.2.2.2 yamt #include <sys/mount.h> 43 1.2.2.2 yamt #include <sys/namei.h> 44 1.2.2.2 yamt #include <sys/stat.h> 45 1.2.2.2 yamt #include <sys/vnode.h> 46 1.2.2.2 yamt #include <sys/vnode_if.h> 47 1.2.2.2 yamt 48 1.2.2.2 yamt #include <miscfs/genfs/genfs.h> 49 1.2.2.2 yamt 50 1.2.2.2 yamt #include <fs/tmpfs/tmpfs_vnops.h> 51 1.2.2.2 yamt #include <fs/tmpfs/tmpfs.h> 52 1.2.2.2 yamt 53 1.2.2.2 yamt /* 54 1.2.2.2 yamt * Forward declarations 55 1.2.2.2 yamt */ 56 1.2.2.2 yamt 57 1.2.2.2 yamt static int tmpfs_sane_rename(struct vnode *, struct componentname *, 58 1.2.2.2 yamt struct vnode *, struct componentname *, 59 1.2.2.2 yamt kauth_cred_t, bool); 60 1.2.2.2 yamt static bool tmpfs_rmdired_p(struct vnode *); 61 1.2.2.2 yamt static int tmpfs_gro_lock_directory(struct mount *, struct vnode *); 62 1.2.2.2 yamt 63 1.2.2.2 yamt static const struct genfs_rename_ops tmpfs_genfs_rename_ops; 64 1.2.2.2 yamt 65 1.2.2.2 yamt /* 66 1.2.2.2 yamt * tmpfs_sane_rename: The hairiest vop, with the saner API. 67 1.2.2.2 yamt * 68 1.2.2.2 yamt * Arguments: 69 1.2.2.2 yamt * 70 1.2.2.2 yamt * . fdvp (from directory vnode), 71 1.2.2.2 yamt * . fcnp (from component name), 72 1.2.2.2 yamt * . tdvp (to directory vnode), 73 1.2.2.2 yamt * . tcnp (to component name), 74 1.2.2.2 yamt * . cred (credentials structure), and 75 1.2.2.2 yamt * . posixly_correct (flag for behaviour if target & source link same file). 76 1.2.2.2 yamt * 77 1.2.2.2 yamt * fdvp and tdvp may be the same, and must be referenced and unlocked. 78 1.2.2.2 yamt */ 79 1.2.2.2 yamt static int 80 1.2.2.2 yamt tmpfs_sane_rename( 81 1.2.2.2 yamt struct vnode *fdvp, struct componentname *fcnp, 82 1.2.2.2 yamt struct vnode *tdvp, struct componentname *tcnp, 83 1.2.2.2 yamt kauth_cred_t cred, bool posixly_correct) 84 1.2.2.2 yamt { 85 1.2.2.2 yamt struct tmpfs_dirent *fdirent, *tdirent; 86 1.2.2.2 yamt 87 1.2.2.2 yamt return genfs_sane_rename(&tmpfs_genfs_rename_ops, 88 1.2.2.2 yamt fdvp, fcnp, &fdirent, tdvp, tcnp, &tdirent, 89 1.2.2.2 yamt cred, posixly_correct); 90 1.2.2.2 yamt } 91 1.2.2.2 yamt 92 1.2.2.2 yamt /* 93 1.2.2.2 yamt * tmpfs_rename: The hairiest vop, with the insanest API. Defer to 94 1.2.2.2 yamt * genfs_insane_rename immediately. 95 1.2.2.2 yamt */ 96 1.2.2.2 yamt int 97 1.2.2.2 yamt tmpfs_rename(void *v) 98 1.2.2.2 yamt { 99 1.2.2.2 yamt 100 1.2.2.2 yamt return genfs_insane_rename(v, &tmpfs_sane_rename); 101 1.2.2.2 yamt } 102 1.2.2.2 yamt 103 1.2.2.2 yamt /* 104 1.2.2.2 yamt * tmpfs_gro_directory_empty_p: Return true if the directory vp is 105 1.2.2.2 yamt * empty. dvp is its parent. 106 1.2.2.2 yamt * 107 1.2.2.2 yamt * vp and dvp must be locked and referenced. 108 1.2.2.2 yamt */ 109 1.2.2.2 yamt static bool 110 1.2.2.2 yamt tmpfs_gro_directory_empty_p(struct mount *mp, kauth_cred_t cred, 111 1.2.2.2 yamt struct vnode *vp, struct vnode *dvp) 112 1.2.2.2 yamt { 113 1.2.2.2 yamt 114 1.2.2.2 yamt (void)mp; 115 1.2.2.2 yamt (void)cred; 116 1.2.2.2 yamt (void)dvp; 117 1.2.2.2 yamt KASSERT(mp != NULL); 118 1.2.2.2 yamt KASSERT(vp != NULL); 119 1.2.2.2 yamt KASSERT(dvp != NULL); 120 1.2.2.2 yamt KASSERT(vp != dvp); 121 1.2.2.2 yamt KASSERT(vp->v_mount == mp); 122 1.2.2.2 yamt KASSERT(dvp->v_mount == mp); 123 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 124 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); 125 1.2.2.2 yamt 126 1.2.2.2 yamt return (VP_TO_TMPFS_NODE(vp)->tn_size == 0); 127 1.2.2.2 yamt } 128 1.2.2.2 yamt 129 1.2.2.2 yamt /* 130 1.2.2.2 yamt * tmpfs_gro_rename_check_possible: Check whether a rename is possible 131 1.2.2.2 yamt * independent of credentials. 132 1.2.2.2 yamt */ 133 1.2.2.2 yamt static int 134 1.2.2.2 yamt tmpfs_gro_rename_check_possible(struct mount *mp, 135 1.2.2.2 yamt struct vnode *fdvp, struct vnode *fvp, 136 1.2.2.2 yamt struct vnode *tdvp, struct vnode *tvp) 137 1.2.2.2 yamt { 138 1.2.2.2 yamt 139 1.2.2.2 yamt (void)mp; 140 1.2.2.2 yamt KASSERT(mp != NULL); 141 1.2.2.2 yamt KASSERT(fdvp != NULL); 142 1.2.2.2 yamt KASSERT(fvp != NULL); 143 1.2.2.2 yamt KASSERT(tdvp != NULL); 144 1.2.2.2 yamt KASSERT(fdvp != fvp); 145 1.2.2.2 yamt KASSERT(fdvp != tvp); 146 1.2.2.2 yamt KASSERT(tdvp != fvp); 147 1.2.2.2 yamt KASSERT(tdvp != tvp); 148 1.2.2.2 yamt KASSERT(fvp != tvp); 149 1.2.2.2 yamt KASSERT(fdvp->v_type == VDIR); 150 1.2.2.2 yamt KASSERT(tdvp->v_type == VDIR); 151 1.2.2.2 yamt KASSERT(fdvp->v_mount == mp); 152 1.2.2.2 yamt KASSERT(fvp->v_mount == mp); 153 1.2.2.2 yamt KASSERT(tdvp->v_mount == mp); 154 1.2.2.2 yamt KASSERT((tvp == NULL) || (tvp->v_mount == mp)); 155 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE); 156 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE); 157 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 158 1.2.2.2 yamt KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 159 1.2.2.2 yamt 160 1.2.2.2 yamt return genfs_ufslike_rename_check_possible( 161 1.2.2.2 yamt VP_TO_TMPFS_NODE(fdvp)->tn_flags, VP_TO_TMPFS_NODE(fvp)->tn_flags, 162 1.2.2.2 yamt VP_TO_TMPFS_NODE(tdvp)->tn_flags, 163 1.2.2.2 yamt (tvp? VP_TO_TMPFS_NODE(tvp)->tn_flags : 0), (tvp != NULL), 164 1.2.2.2 yamt IMMUTABLE, APPEND); 165 1.2.2.2 yamt } 166 1.2.2.2 yamt 167 1.2.2.2 yamt /* 168 1.2.2.2 yamt * tmpfs_gro_rename_check_permitted: Check whether a rename is 169 1.2.2.2 yamt * permitted given our credentials. 170 1.2.2.2 yamt */ 171 1.2.2.2 yamt static int 172 1.2.2.2 yamt tmpfs_gro_rename_check_permitted(struct mount *mp, kauth_cred_t cred, 173 1.2.2.2 yamt struct vnode *fdvp, struct vnode *fvp, 174 1.2.2.2 yamt struct vnode *tdvp, struct vnode *tvp) 175 1.2.2.2 yamt { 176 1.2.2.2 yamt 177 1.2.2.2 yamt (void)mp; 178 1.2.2.2 yamt KASSERT(mp != NULL); 179 1.2.2.2 yamt KASSERT(fdvp != NULL); 180 1.2.2.2 yamt KASSERT(fvp != NULL); 181 1.2.2.2 yamt KASSERT(tdvp != NULL); 182 1.2.2.2 yamt KASSERT(fdvp != fvp); 183 1.2.2.2 yamt KASSERT(fdvp != tvp); 184 1.2.2.2 yamt KASSERT(tdvp != fvp); 185 1.2.2.2 yamt KASSERT(tdvp != tvp); 186 1.2.2.2 yamt KASSERT(fvp != tvp); 187 1.2.2.2 yamt KASSERT(fdvp->v_type == VDIR); 188 1.2.2.2 yamt KASSERT(tdvp->v_type == VDIR); 189 1.2.2.2 yamt KASSERT(fdvp->v_mount == mp); 190 1.2.2.2 yamt KASSERT(fvp->v_mount == mp); 191 1.2.2.2 yamt KASSERT(tdvp->v_mount == mp); 192 1.2.2.2 yamt KASSERT((tvp == NULL) || (tvp->v_mount == mp)); 193 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE); 194 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE); 195 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 196 1.2.2.2 yamt KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 197 1.2.2.2 yamt 198 1.2.2.2 yamt return genfs_ufslike_rename_check_permitted(cred, 199 1.2.2.2 yamt fdvp, VP_TO_TMPFS_NODE(fdvp)->tn_mode, 200 1.2.2.2 yamt VP_TO_TMPFS_NODE(fdvp)->tn_uid, 201 1.2.2.2 yamt fvp, VP_TO_TMPFS_NODE(fvp)->tn_uid, 202 1.2.2.2 yamt tdvp, VP_TO_TMPFS_NODE(tdvp)->tn_mode, 203 1.2.2.2 yamt VP_TO_TMPFS_NODE(tdvp)->tn_uid, 204 1.2.2.2 yamt tvp, (tvp? VP_TO_TMPFS_NODE(tvp)->tn_uid : 0)); 205 1.2.2.2 yamt } 206 1.2.2.2 yamt 207 1.2.2.2 yamt /* 208 1.2.2.2 yamt * tmpfs_gro_remove_check_possible: Check whether a remove is possible 209 1.2.2.2 yamt * independent of credentials. 210 1.2.2.2 yamt */ 211 1.2.2.2 yamt static int 212 1.2.2.2 yamt tmpfs_gro_remove_check_possible(struct mount *mp, 213 1.2.2.2 yamt struct vnode *dvp, struct vnode *vp) 214 1.2.2.2 yamt { 215 1.2.2.2 yamt 216 1.2.2.2 yamt (void)mp; 217 1.2.2.2 yamt KASSERT(mp != NULL); 218 1.2.2.2 yamt KASSERT(dvp != NULL); 219 1.2.2.2 yamt KASSERT(vp != NULL); 220 1.2.2.2 yamt KASSERT(dvp != vp); 221 1.2.2.2 yamt KASSERT(dvp->v_type == VDIR); 222 1.2.2.2 yamt KASSERT(vp->v_type != VDIR); 223 1.2.2.2 yamt KASSERT(dvp->v_mount == mp); 224 1.2.2.2 yamt KASSERT(vp->v_mount == mp); 225 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); 226 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 227 1.2.2.2 yamt 228 1.2.2.2 yamt return genfs_ufslike_remove_check_possible( 229 1.2.2.2 yamt VP_TO_TMPFS_NODE(dvp)->tn_flags, VP_TO_TMPFS_NODE(vp)->tn_flags, 230 1.2.2.2 yamt IMMUTABLE, APPEND); 231 1.2.2.2 yamt } 232 1.2.2.2 yamt 233 1.2.2.2 yamt /* 234 1.2.2.2 yamt * tmpfs_gro_remove_check_permitted: Check whether a remove is 235 1.2.2.2 yamt * permitted given our credentials. 236 1.2.2.2 yamt */ 237 1.2.2.2 yamt static int 238 1.2.2.2 yamt tmpfs_gro_remove_check_permitted(struct mount *mp, kauth_cred_t cred, 239 1.2.2.2 yamt struct vnode *dvp, struct vnode *vp) 240 1.2.2.2 yamt { 241 1.2.2.2 yamt 242 1.2.2.2 yamt (void)mp; 243 1.2.2.2 yamt KASSERT(mp != NULL); 244 1.2.2.2 yamt KASSERT(dvp != NULL); 245 1.2.2.2 yamt KASSERT(vp != NULL); 246 1.2.2.2 yamt KASSERT(dvp != vp); 247 1.2.2.2 yamt KASSERT(dvp->v_type == VDIR); 248 1.2.2.2 yamt KASSERT(vp->v_type != VDIR); 249 1.2.2.2 yamt KASSERT(dvp->v_mount == mp); 250 1.2.2.2 yamt KASSERT(vp->v_mount == mp); 251 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); 252 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 253 1.2.2.2 yamt 254 1.2.2.2 yamt return genfs_ufslike_remove_check_permitted(cred, 255 1.2.2.2 yamt dvp, VP_TO_TMPFS_NODE(dvp)->tn_mode, VP_TO_TMPFS_NODE(dvp)->tn_uid, 256 1.2.2.2 yamt vp, VP_TO_TMPFS_NODE(vp)->tn_uid); 257 1.2.2.2 yamt } 258 1.2.2.2 yamt 259 1.2.2.2 yamt /* 260 1.2.2.2 yamt * tmpfs_gro_rename: Actually perform the rename operation. 261 1.2.2.2 yamt */ 262 1.2.2.2 yamt static int 263 1.2.2.2 yamt tmpfs_gro_rename(struct mount *mp, kauth_cred_t cred, 264 1.2.2.2 yamt struct vnode *fdvp, struct componentname *fcnp, 265 1.2.2.2 yamt void *fde, struct vnode *fvp, 266 1.2.2.2 yamt struct vnode *tdvp, struct componentname *tcnp, 267 1.2.2.2 yamt void *tde, struct vnode *tvp) 268 1.2.2.2 yamt { 269 1.2.2.2 yamt struct tmpfs_dirent **fdep = fde; 270 1.2.2.2 yamt struct tmpfs_dirent **tdep = tde; 271 1.2.2.2 yamt char *newname; 272 1.2.2.2 yamt 273 1.2.2.2 yamt (void)cred; 274 1.2.2.2 yamt KASSERT(mp != NULL); 275 1.2.2.2 yamt KASSERT(fdvp != NULL); 276 1.2.2.2 yamt KASSERT(fcnp != NULL); 277 1.2.2.2 yamt KASSERT(fdep != NULL); 278 1.2.2.2 yamt KASSERT(fvp != NULL); 279 1.2.2.2 yamt KASSERT(tdvp != NULL); 280 1.2.2.2 yamt KASSERT(tcnp != NULL); 281 1.2.2.2 yamt KASSERT(tdep != NULL); 282 1.2.2.2 yamt KASSERT(fdep != tdep); 283 1.2.2.2 yamt KASSERT((*fdep) != (*tdep)); 284 1.2.2.2 yamt KASSERT((*fdep) != NULL); 285 1.2.2.2 yamt KASSERT((*fdep)->td_node == VP_TO_TMPFS_NODE(fvp)); 286 1.2.2.2 yamt KASSERT((tvp == NULL) || ((*tdep) != NULL)); 287 1.2.2.2 yamt KASSERT((tvp == NULL) || ((*tdep)->td_node == VP_TO_TMPFS_NODE(tvp))); 288 1.2.2.2 yamt KASSERT(fdvp != fvp); 289 1.2.2.2 yamt KASSERT(fdvp != tvp); 290 1.2.2.2 yamt KASSERT(tdvp != fvp); 291 1.2.2.2 yamt KASSERT(tdvp != tvp); 292 1.2.2.2 yamt KASSERT(fvp != tvp); 293 1.2.2.2 yamt KASSERT(fdvp->v_mount == mp); 294 1.2.2.2 yamt KASSERT(fvp->v_mount == mp); 295 1.2.2.2 yamt KASSERT(tdvp->v_mount == mp); 296 1.2.2.2 yamt KASSERT((tvp == NULL) || (tvp->v_mount == mp)); 297 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE); 298 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE); 299 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); 300 1.2.2.2 yamt KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); 301 1.2.2.2 yamt 302 1.2.2.2 yamt if (tmpfs_strname_neqlen(fcnp, tcnp)) { 303 1.2.2.2 yamt newname = tmpfs_strname_alloc(VFS_TO_TMPFS(mp), 304 1.2.2.2 yamt tcnp->cn_namelen); 305 1.2.2.2 yamt if (newname == NULL) 306 1.2.2.2 yamt return ENOSPC; 307 1.2.2.2 yamt } else { 308 1.2.2.2 yamt newname = NULL; 309 1.2.2.2 yamt } 310 1.2.2.2 yamt 311 1.2.2.2 yamt /* 312 1.2.2.2 yamt * If we are moving from one directory to another, detach the 313 1.2.2.2 yamt * source entry and reattach it to the target directory. 314 1.2.2.2 yamt */ 315 1.2.2.2 yamt if (fdvp != tdvp) { 316 1.2.2.2 yamt tmpfs_dir_detach(fdvp, *fdep); 317 1.2.2.2 yamt tmpfs_dir_attach(tdvp, *fdep, VP_TO_TMPFS_NODE(fvp)); 318 1.2.2.2 yamt } else if (tvp == NULL) { 319 1.2.2.2 yamt /* 320 1.2.2.2 yamt * We are changing the directory. tmpfs_dir_attach and 321 1.2.2.2 yamt * tmpfs_dir_detach note the events for us, but for 322 1.2.2.2 yamt * this case we don't call them, so we must note the 323 1.2.2.2 yamt * event explicitly. 324 1.2.2.2 yamt */ 325 1.2.2.2 yamt VN_KNOTE(fdvp, NOTE_WRITE); 326 1.2.2.2 yamt } 327 1.2.2.2 yamt 328 1.2.2.2 yamt /* 329 1.2.2.2 yamt * If we are replacing an existing target entry, delete it. 330 1.2.2.2 yamt * 331 1.2.2.2 yamt * XXX What if the target is a directory with whiteout entries? 332 1.2.2.2 yamt */ 333 1.2.2.2 yamt if (tvp != NULL) { 334 1.2.2.2 yamt KASSERT((*tdep) != NULL); 335 1.2.2.2 yamt KASSERT((*tdep)->td_node == VP_TO_TMPFS_NODE(tvp)); 336 1.2.2.2 yamt KASSERT((fvp->v_type == VDIR) == (tvp->v_type == VDIR)); 337 1.2.2.2 yamt if (tvp->v_type == VDIR) { 338 1.2.2.2 yamt KASSERT(VP_TO_TMPFS_NODE(tvp)->tn_size == 0); 339 1.2.2.2 yamt KASSERT(VP_TO_TMPFS_NODE(tvp)->tn_links == 2); 340 1.2.2.2 yamt 341 1.2.2.2 yamt /* 342 1.2.2.2 yamt * Decrement the extra link count for `.' so 343 1.2.2.2 yamt * the vnode will be recycled when released. 344 1.2.2.2 yamt * 345 1.2.2.2 yamt * XXX Why not just release directory vnodes 346 1.2.2.2 yamt * when their link count is 1 instead of 0 in 347 1.2.2.2 yamt * tmpfs_inactive, since `.' is being treated 348 1.2.2.2 yamt * specially anyway? 349 1.2.2.2 yamt */ 350 1.2.2.2 yamt VP_TO_TMPFS_NODE(tvp)->tn_links--; 351 1.2.2.2 yamt } 352 1.2.2.2 yamt tmpfs_dir_detach(tdvp, *tdep); 353 1.2.2.2 yamt tmpfs_free_dirent(VFS_TO_TMPFS(mp), *tdep); 354 1.2.2.2 yamt } 355 1.2.2.2 yamt 356 1.2.2.2 yamt /* 357 1.2.2.2 yamt * Update the directory entry's name if necessary, and flag 358 1.2.2.2 yamt * metadata updates. A memory allocation failure here is not 359 1.2.2.2 yamt * OK because we've already committed some changes that we 360 1.2.2.2 yamt * can't back out at this point, hence the early allocation 361 1.2.2.2 yamt * above. 362 1.2.2.2 yamt */ 363 1.2.2.2 yamt if (newname != NULL) { 364 1.2.2.2 yamt KASSERT(tcnp->cn_namelen <= TMPFS_MAXNAMLEN); 365 1.2.2.2 yamt 366 1.2.2.2 yamt tmpfs_strname_free(VFS_TO_TMPFS(mp), (*fdep)->td_name, 367 1.2.2.2 yamt (*fdep)->td_namelen); 368 1.2.2.2 yamt (*fdep)->td_namelen = (uint16_t)tcnp->cn_namelen; 369 1.2.2.2 yamt (void)memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 370 1.2.2.2 yamt (*fdep)->td_name = newname; 371 1.2.2.2 yamt 372 1.2.2.2 yamt VP_TO_TMPFS_NODE(fvp)->tn_status |= TMPFS_NODE_CHANGED; 373 1.2.2.2 yamt VP_TO_TMPFS_NODE(tdvp)->tn_status |= TMPFS_NODE_MODIFIED; 374 1.2.2.2 yamt } 375 1.2.2.2 yamt 376 1.2.2.2 yamt VN_KNOTE(fvp, NOTE_RENAME); 377 1.2.2.2 yamt 378 1.2.2.2 yamt #if 0 /* XXX */ 379 1.2.2.2 yamt genfs_rename_cache_purge(fdvp, fvp, tdvp, tvp); 380 1.2.2.2 yamt #endif 381 1.2.2.2 yamt 382 1.2.2.2 yamt return 0; 383 1.2.2.2 yamt } 384 1.2.2.2 yamt 385 1.2.2.2 yamt /* 386 1.2.2.2 yamt * tmpfs_gro_remove: Rename an object over another link to itself, 387 1.2.2.2 yamt * effectively removing just the original link. 388 1.2.2.2 yamt */ 389 1.2.2.2 yamt static int 390 1.2.2.2 yamt tmpfs_gro_remove(struct mount *mp, kauth_cred_t cred, 391 1.2.2.2 yamt struct vnode *dvp, struct componentname *cnp, void *de, struct vnode *vp) 392 1.2.2.2 yamt { 393 1.2.2.2 yamt struct tmpfs_dirent **dep = de; 394 1.2.2.2 yamt 395 1.2.2.2 yamt (void)vp; 396 1.2.2.2 yamt KASSERT(mp != NULL); 397 1.2.2.2 yamt KASSERT(dvp != NULL); 398 1.2.2.2 yamt KASSERT(cnp != NULL); 399 1.2.2.2 yamt KASSERT(dep != NULL); 400 1.2.2.2 yamt KASSERT(vp != NULL); 401 1.2.2.2 yamt KASSERT(dvp != vp); 402 1.2.2.2 yamt KASSERT(dvp->v_mount == mp); 403 1.2.2.2 yamt KASSERT(vp->v_mount == mp); 404 1.2.2.2 yamt KASSERT(dvp->v_type == VDIR); 405 1.2.2.2 yamt KASSERT(vp->v_type != VDIR); 406 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); 407 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 408 1.2.2.2 yamt 409 1.2.2.2 yamt tmpfs_dir_detach(dvp, *dep); 410 1.2.2.2 yamt tmpfs_free_dirent(VFS_TO_TMPFS(mp), *dep); 411 1.2.2.2 yamt 412 1.2.2.2 yamt return 0; 413 1.2.2.2 yamt } 414 1.2.2.2 yamt 415 1.2.2.2 yamt /* 416 1.2.2.2 yamt * tmpfs_gro_lookup: Look up and save the lookup results. 417 1.2.2.2 yamt */ 418 1.2.2.2 yamt static int 419 1.2.2.2 yamt tmpfs_gro_lookup(struct mount *mp, struct vnode *dvp, 420 1.2.2.2 yamt struct componentname *cnp, void *de_ret, struct vnode **vp_ret) 421 1.2.2.2 yamt { 422 1.2.2.2 yamt struct tmpfs_dirent *dirent, **dep_ret = de_ret; 423 1.2.2.2 yamt struct vnode *vp; 424 1.2.2.2 yamt int error; 425 1.2.2.2 yamt 426 1.2.2.2 yamt (void)mp; 427 1.2.2.2 yamt KASSERT(mp != NULL); 428 1.2.2.2 yamt KASSERT(dvp != NULL); 429 1.2.2.2 yamt KASSERT(cnp != NULL); 430 1.2.2.2 yamt KASSERT(dep_ret != NULL); 431 1.2.2.2 yamt KASSERT(vp_ret != NULL); 432 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); 433 1.2.2.2 yamt 434 1.2.2.2 yamt dirent = tmpfs_dir_lookup(VP_TO_TMPFS_NODE(dvp), cnp); 435 1.2.2.2 yamt if (dirent == NULL) 436 1.2.2.2 yamt return ENOENT; 437 1.2.2.2 yamt 438 1.2.2.2 yamt mutex_enter(&dirent->td_node->tn_vlock); 439 1.2.2.2 yamt error = tmpfs_vnode_get(mp, dirent->td_node, &vp); 440 1.2.2.2 yamt /* Note: tmpfs_vnode_get always releases dirent->td_node->tn_vlock. */ 441 1.2.2.2 yamt if (error) 442 1.2.2.2 yamt return error; 443 1.2.2.2 yamt 444 1.2.2.2 yamt KASSERT(vp != NULL); 445 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 446 1.2.2.2 yamt 447 1.2.2.2 yamt /* 448 1.2.2.2 yamt * tmpfs_vnode_get returns this locked for us, which would be 449 1.2.2.2 yamt * convenient but for lossage in other file systems. So, for 450 1.2.2.2 yamt * hysterical raisins, we have to unlock it here. The caller 451 1.2.2.2 yamt * will lock it again, and we don't rely on any interesting 452 1.2.2.2 yamt * invariants in the interim, beyond that it won't vanish from 453 1.2.2.2 yamt * under us, which it won't because it's referenced. 454 1.2.2.2 yamt * 455 1.2.2.2 yamt * XXX Once namei is fixed, we can change the genfs_rename 456 1.2.2.2 yamt * protocol so that this unlock is not necessary. 457 1.2.2.2 yamt */ 458 1.2.2.2 yamt VOP_UNLOCK(vp); 459 1.2.2.2 yamt 460 1.2.2.2 yamt *dep_ret = dirent; 461 1.2.2.2 yamt *vp_ret = vp; 462 1.2.2.2 yamt return 0; 463 1.2.2.2 yamt } 464 1.2.2.2 yamt 465 1.2.2.2 yamt /* 466 1.2.2.2 yamt * tmpfs_rmdired_p: Check whether the directory vp has been rmdired. 467 1.2.2.2 yamt * 468 1.2.2.2 yamt * vp must be locked and referenced. 469 1.2.2.2 yamt */ 470 1.2.2.2 yamt static bool 471 1.2.2.2 yamt tmpfs_rmdired_p(struct vnode *vp) 472 1.2.2.2 yamt { 473 1.2.2.2 yamt 474 1.2.2.2 yamt KASSERT(vp != NULL); 475 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 476 1.2.2.2 yamt KASSERT(vp->v_type == VDIR); 477 1.2.2.2 yamt 478 1.2.2.2 yamt return (VP_TO_TMPFS_NODE(vp)->tn_spec.tn_dir.tn_parent == NULL); 479 1.2.2.2 yamt } 480 1.2.2.2 yamt 481 1.2.2.2 yamt /* 482 1.2.2.2 yamt * tmpfs_gro_genealogy: Analyze the genealogy of the source and target 483 1.2.2.2 yamt * directories. 484 1.2.2.2 yamt */ 485 1.2.2.2 yamt static int 486 1.2.2.2 yamt tmpfs_gro_genealogy(struct mount *mp, kauth_cred_t cred, 487 1.2.2.2 yamt struct vnode *fdvp, struct vnode *tdvp, 488 1.2.2.2 yamt struct vnode **intermediate_node_ret) 489 1.2.2.2 yamt { 490 1.2.2.2 yamt struct vnode *vp; 491 1.2.2.2 yamt struct tmpfs_node *dnode; 492 1.2.2.2 yamt int error; 493 1.2.2.2 yamt 494 1.2.2.2 yamt (void)cred; 495 1.2.2.2 yamt KASSERT(mp != NULL); 496 1.2.2.2 yamt KASSERT(fdvp != NULL); 497 1.2.2.2 yamt KASSERT(tdvp != NULL); 498 1.2.2.2 yamt KASSERT(fdvp != tdvp); 499 1.2.2.2 yamt KASSERT(intermediate_node_ret != NULL); 500 1.2.2.2 yamt KASSERT(fdvp->v_mount == mp); 501 1.2.2.2 yamt KASSERT(tdvp->v_mount == mp); 502 1.2.2.2 yamt KASSERT(fdvp->v_type == VDIR); 503 1.2.2.2 yamt KASSERT(tdvp->v_type == VDIR); 504 1.2.2.2 yamt 505 1.2.2.2 yamt /* 506 1.2.2.2 yamt * We need to provisionally lock tdvp to keep rmdir from 507 1.2.2.2 yamt * deleting it -- or any ancestor -- at an inopportune moment. 508 1.2.2.2 yamt */ 509 1.2.2.2 yamt error = tmpfs_gro_lock_directory(mp, tdvp); 510 1.2.2.2 yamt if (error) 511 1.2.2.2 yamt return error; 512 1.2.2.2 yamt 513 1.2.2.2 yamt vp = tdvp; 514 1.2.2.2 yamt vref(vp); 515 1.2.2.2 yamt 516 1.2.2.2 yamt for (;;) { 517 1.2.2.2 yamt KASSERT(vp != NULL); 518 1.2.2.2 yamt KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); 519 1.2.2.2 yamt KASSERT(vp->v_mount == mp); 520 1.2.2.2 yamt KASSERT(vp->v_type == VDIR); 521 1.2.2.2 yamt KASSERT(!tmpfs_rmdired_p(vp)); 522 1.2.2.2 yamt 523 1.2.2.2 yamt dnode = VP_TO_TMPFS_NODE(vp)->tn_spec.tn_dir.tn_parent; 524 1.2.2.2 yamt 525 1.2.2.2 yamt /* 526 1.2.2.2 yamt * If dnode is null then vp has been rmdir'd, which is 527 1.2.2.2 yamt * not supposed to happen because we have it locked. 528 1.2.2.2 yamt */ 529 1.2.2.2 yamt KASSERT(dnode != NULL); 530 1.2.2.2 yamt 531 1.2.2.2 yamt /* Did we hit the root without finding fdvp? */ 532 1.2.2.2 yamt if (dnode == VP_TO_TMPFS_NODE(vp)) { 533 1.2.2.2 yamt vput(vp); 534 1.2.2.2 yamt *intermediate_node_ret = NULL; 535 1.2.2.2 yamt return 0; 536 1.2.2.2 yamt } 537 1.2.2.2 yamt 538 1.2.2.2 yamt /* Did we find that fdvp is an ancestor of tdvp? */ 539 1.2.2.2 yamt if (dnode == VP_TO_TMPFS_NODE(fdvp)) { 540 1.2.2.2 yamt KASSERT(dnode->tn_vnode == fdvp); 541 1.2.2.2 yamt /* Unlock vp, but keep it referenced. */ 542 1.2.2.2 yamt VOP_UNLOCK(vp); 543 1.2.2.2 yamt *intermediate_node_ret = vp; 544 1.2.2.2 yamt return 0; 545 1.2.2.2 yamt } 546 1.2.2.2 yamt 547 1.2.2.2 yamt /* Neither -- keep ascending the family tree. */ 548 1.2.2.2 yamt mutex_enter(&dnode->tn_vlock); 549 1.2.2.2 yamt vput(vp); 550 1.2.2.2 yamt vp = NULL; /* Just in case, for the kassert above... */ 551 1.2.2.2 yamt error = tmpfs_vnode_get(mp, dnode, &vp); 552 1.2.2.2 yamt if (error) 553 1.2.2.2 yamt return error; 554 1.2.2.2 yamt } 555 1.2.2.2 yamt } 556 1.2.2.2 yamt 557 1.2.2.2 yamt /* 558 1.2.2.2 yamt * tmpfs_gro_lock_directory: Lock the directory vp, but fail if it has 559 1.2.2.2 yamt * been rmdir'd. 560 1.2.2.2 yamt */ 561 1.2.2.2 yamt static int 562 1.2.2.2 yamt tmpfs_gro_lock_directory(struct mount *mp, struct vnode *vp) 563 1.2.2.2 yamt { 564 1.2.2.2 yamt 565 1.2.2.2 yamt (void)mp; 566 1.2.2.2 yamt KASSERT(mp != NULL); 567 1.2.2.2 yamt KASSERT(vp != NULL); 568 1.2.2.2 yamt KASSERT(vp->v_mount == mp); 569 1.2.2.2 yamt 570 1.2.2.2 yamt vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 571 1.2.2.2 yamt 572 1.2.2.2 yamt if (tmpfs_rmdired_p(vp)) { 573 1.2.2.2 yamt VOP_UNLOCK(vp); 574 1.2.2.2 yamt return ENOENT; 575 1.2.2.2 yamt } 576 1.2.2.2 yamt 577 1.2.2.2 yamt return 0; 578 1.2.2.2 yamt } 579 1.2.2.2 yamt 580 1.2.2.2 yamt static const struct genfs_rename_ops tmpfs_genfs_rename_ops = { 581 1.2.2.2 yamt .gro_directory_empty_p = tmpfs_gro_directory_empty_p, 582 1.2.2.2 yamt .gro_rename_check_possible = tmpfs_gro_rename_check_possible, 583 1.2.2.2 yamt .gro_rename_check_permitted = tmpfs_gro_rename_check_permitted, 584 1.2.2.2 yamt .gro_remove_check_possible = tmpfs_gro_remove_check_possible, 585 1.2.2.2 yamt .gro_remove_check_permitted = tmpfs_gro_remove_check_permitted, 586 1.2.2.2 yamt .gro_rename = tmpfs_gro_rename, 587 1.2.2.2 yamt .gro_remove = tmpfs_gro_remove, 588 1.2.2.2 yamt .gro_lookup = tmpfs_gro_lookup, 589 1.2.2.2 yamt .gro_genealogy = tmpfs_gro_genealogy, 590 1.2.2.2 yamt .gro_lock_directory = tmpfs_gro_lock_directory, 591 1.2.2.2 yamt }; 592
Indexes created Tue Sep 23 07:09:52 GMT 2025