1/* 2 * Copyright (c) 1997-2006 Erez Zadok 3 * Copyright (c) 1990 Jan-Simon Pendry 4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jan-Simon Pendry at Imperial College, London. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgment: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * 40 * File: am-utils/amd/mntfs.c 41 * 42 */ 43 44#ifdef HAVE_CONFIG_H 45# include <config.h> 46#endif /* HAVE_CONFIG_H */ 47#include <am_defs.h> 48#include <amd.h> 49 50qelem mfhead = {&mfhead, &mfhead}; 51 52int mntfs_allocated; 53 54 55mntfs * 56dup_mntfs(mntfs *mf) 57{ 58 if (mf->mf_refc == 0) { 59 if (mf->mf_cid) 60 untimeout(mf->mf_cid); 61 mf->mf_cid = 0; 62 } 63 mf->mf_refc++; 64 65 return mf; 66} 67 68 69static void 70init_mntfs(mntfs *mf, am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) 71{ 72 mf->mf_ops = ops; 73 mf->mf_fsflags = ops->nfs_fs_flags; 74 mf->mf_fo = mo; 75 mf->mf_mount = strdup(mp); 76 mf->mf_info = strdup(info); 77 mf->mf_auto = strdup(auto_opts); 78 mf->mf_mopts = strdup(mopts); 79 mf->mf_remopts = strdup(remopts); 80 mf->mf_loopdev = NULL; 81 mf->mf_refc = 1; 82 mf->mf_flags = 0; 83 mf->mf_error = -1; 84 mf->mf_cid = 0; 85 mf->mf_private = 0; 86 mf->mf_prfree = 0; 87 88 if (ops->ffserver) 89 mf->mf_server = (*ops->ffserver) (mf); 90 else 91 mf->mf_server = 0; 92} 93 94 95static mntfs * 96alloc_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) 97{ 98 mntfs *mf = ALLOC(struct mntfs); 99 100 init_mntfs(mf, ops, mo, mp, info, auto_opts, mopts, remopts); 101 ins_que(&mf->mf_q, &mfhead); 102 mntfs_allocated++; 103 104 return mf; 105} 106 107 108/* find a matching mntfs in our list */ 109mntfs * 110locate_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) 111{ 112 mntfs *mf; 113 114 dlog("Locating mntfs reference to (%s,%s)", mp, info); 115 116 ITER(mf, mntfs, &mfhead) { 117 /* 118 * For backwards compatibility purposes, we treat already-mounted 119 * filesystems differently and only require a match of their mount point, 120 * not of their server info. After all, there is little we can do if 121 * the user asks us to mount two different things onto the same mount: one 122 * will always cover the other one. 123 */ 124 if (STREQ(mf->mf_mount, mp) && 125 ((mf->mf_flags & MFF_MOUNTED && !(mf->mf_fsflags & FS_DIRECT)) 126 || (STREQ(mf->mf_info, info) && mf->mf_ops == ops))) { 127 /* 128 * Handle cases where error ops are involved 129 */ 130 if (ops == &amfs_error_ops) { 131 /* 132 * If the existing ops are not amfs_error_ops 133 * then continue... 134 */ 135 if (mf->mf_ops != &amfs_error_ops) 136 continue; 137 return dup_mntfs(mf); 138 } 139 140 dlog("mf->mf_flags = %#x", mf->mf_flags); 141 mf->mf_fo = mo; 142 if ((mf->mf_flags & MFF_RESTART) && amd_state < Finishing) { 143 /* 144 * Restart a previously mounted filesystem. 145 */ 146 dlog("Restarting filesystem %s", mf->mf_mount); 147 148 /* 149 * If we are restarting an amd internal filesystem, 150 * we need to initialize it a bit. 151 * 152 * We know it's internal because it is marked as toplvl. 153 */ 154 if (mf->mf_ops == &amfs_toplvl_ops) { 155 mf->mf_ops = ops; 156 mf->mf_info = strealloc(mf->mf_info, info); 157 ops->mounted(mf); /* XXX: not right, but will do for now */ 158 } 159 160 return mf; 161 } 162 163 if (!(mf->mf_flags & (MFF_MOUNTED | MFF_MOUNTING | MFF_UNMOUNTING))) { 164 fserver *fs; 165 mf->mf_flags &= ~MFF_ERROR; 166 mf->mf_error = -1; 167 mf->mf_auto = strealloc(mf->mf_auto, auto_opts); 168 mf->mf_mopts = strealloc(mf->mf_mopts, mopts); 169 mf->mf_remopts = strealloc(mf->mf_remopts, remopts); 170 mf->mf_info = strealloc(mf->mf_info, info); 171 172 if (mf->mf_private && mf->mf_prfree) { 173 mf->mf_prfree(mf->mf_private); 174 mf->mf_private = 0; 175 } 176 177 fs = ops->ffserver ? (*ops->ffserver) (mf) : (fserver *) NULL; 178 if (mf->mf_server) 179 free_srvr(mf->mf_server); 180 mf->mf_server = fs; 181 } 182 return dup_mntfs(mf); 183 } /* end of "if (STREQ(mf-> ..." */ 184 } /* end of ITER */ 185 186 return 0; 187} 188 189 190/* find a matching mntfs in our list, create a new one if none is found */ 191mntfs * 192find_mntfs(am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) 193{ 194 mntfs *mf = locate_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); 195 if (mf) 196 return mf; 197 198 return alloc_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); 199} 200 201 202mntfs * 203new_mntfs(void) 204{ 205 return alloc_mntfs(&amfs_error_ops, (am_opts *) 0, "//nil//", ".", "", "", ""); 206} 207 208 209static void 210uninit_mntfs(mntfs *mf) 211{ 212 if (mf->mf_auto) 213 XFREE(mf->mf_auto); 214 if (mf->mf_mopts) 215 XFREE(mf->mf_mopts); 216 if (mf->mf_remopts) 217 XFREE(mf->mf_remopts); 218 if (mf->mf_info) 219 XFREE(mf->mf_info); 220 if (mf->mf_private && mf->mf_prfree) 221 (*mf->mf_prfree) (mf->mf_private); 222 223 if (mf->mf_mount) 224 XFREE(mf->mf_mount); 225 226 /* 227 * Clean up the file server 228 */ 229 if (mf->mf_server) 230 free_srvr(mf->mf_server); 231 232 /* 233 * Don't do a callback on this mount 234 */ 235 if (mf->mf_cid) { 236 untimeout(mf->mf_cid); 237 mf->mf_cid = 0; 238 } 239} 240 241 242static void 243discard_mntfs(voidp v) 244{ 245 mntfs *mf = v; 246 247 rem_que(&mf->mf_q); 248 249 /* 250 * Free memory 251 */ 252 uninit_mntfs(mf); 253 XFREE(mf); 254 255 --mntfs_allocated; 256} 257 258 259void 260flush_mntfs(void) 261{ 262 mntfs *mf; 263 264 mf = AM_FIRST(mntfs, &mfhead); 265 while (mf != HEAD(mntfs, &mfhead)) { 266 mntfs *mf2 = mf; 267 mf = NEXT(mntfs, mf); 268 if (mf2->mf_refc == 0 && mf2->mf_cid) 269 discard_mntfs(mf2); 270 } 271} 272 273 274void 275free_mntfs(opaque_t arg) 276{ 277 mntfs *mf = (mntfs *) arg; 278 279 dlog("free_mntfs <%s> type %s mf_refc %d flags %x", 280 mf->mf_mount, mf->mf_ops->fs_type, mf->mf_refc, mf->mf_flags); 281 282 /* 283 * We shouldn't ever be called to free something that has 284 * a non-positive refcount. Something is badly wrong if 285 * we have been! Ignore the request for now... 286 */ 287 if (mf->mf_refc <= 0) { 288 plog(XLOG_ERROR, "IGNORING free_mntfs for <%s>: refc %d, flags %x (bug?)", 289 mf->mf_mount, mf->mf_refc, mf->mf_flags); 290 return; 291 } 292 293 /* don't discard last reference of a restarted/kept mntfs */ 294 if (mf->mf_refc == 1 && mf->mf_flags & MFF_RSTKEEP) { 295 plog(XLOG_ERROR, "IGNORING free_mntfs for <%s>: refc %d, flags %x (restarted)", 296 mf->mf_mount, mf->mf_refc, mf->mf_flags); 297 return; 298 } 299 300 if (--mf->mf_refc == 0) { 301 if (mf->mf_flags & MFF_MOUNTED) { 302 int quoted; 303 mf->mf_flags &= ~MFF_MOUNTED; 304 305 /* 306 * Record for posterity 307 */ 308 quoted = strchr(mf->mf_info, ' ') != 0; /* cheap */ 309 plog(XLOG_INFO, "%s%s%s %sed fstype %s from %s", 310 quoted ? "\"" : "", 311 mf->mf_info, 312 quoted ? "\"" : "", 313 mf->mf_error ? "discard" : "unmount", 314 mf->mf_ops->fs_type, mf->mf_mount); 315 } 316 317 if (mf->mf_fsflags & FS_DISCARD) { 318 dlog("Immediately discarding mntfs for %s", mf->mf_mount); 319 discard_mntfs(mf); 320 321 } else { 322 323 if (mf->mf_flags & MFF_RESTART) { 324 dlog("Discarding remount hook for %s", mf->mf_mount); 325 } else { 326 dlog("Discarding last mntfs reference to %s fstype %s", 327 mf->mf_mount, mf->mf_ops->fs_type); 328 } 329 if (mf->mf_flags & (MFF_MOUNTED | MFF_MOUNTING | MFF_UNMOUNTING)) 330 dlog("mntfs reference for %s still active", mf->mf_mount); 331 mf->mf_cid = timeout(ALLOWED_MOUNT_TIME, discard_mntfs, (voidp) mf); 332 } 333 } 334} 335 336 337mntfs * 338realloc_mntfs(mntfs *mf, am_ops *ops, am_opts *mo, char *mp, char *info, char *auto_opts, char *mopts, char *remopts) 339{ 340 mntfs *mf2; 341 342 if (mf->mf_refc == 1 && 343 mf->mf_flags & MFF_RESTART && 344 STREQ(mf->mf_mount, mp)) { 345 /* 346 * If we are inheriting then just return 347 * the same node... 348 */ 349 return mf; 350 } 351 352 /* 353 * Re-use the existing mntfs if it is mounted. 354 * This traps a race in nfsx. 355 */ 356 if (mf->mf_ops != &amfs_error_ops && 357 (mf->mf_flags & MFF_MOUNTED) && 358 !FSRV_ISDOWN(mf->mf_server)) { 359 mf->mf_fo = mo; 360 return mf; 361 } 362 363 mf2 = find_mntfs(ops, mo, mp, info, auto_opts, mopts, remopts); 364 free_mntfs(mf); 365 return mf2; 366} 367