| 1 | /* |
| 2 | * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Matthew Dillon <dillon@backplane.com> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 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 |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific, prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include <sys/mountctl.h> |
| 36 | #include <sys/namecache.h> |
| 37 | #include <sys/buf2.h> |
| 38 | #include <vfs/fifofs/fifo.h> |
| 39 | |
| 40 | #include "hammer.h" |
| 41 | |
| 42 | /* |
| 43 | * USERFS VNOPS |
| 44 | */ |
| 45 | static int hammer_vop_fsync(struct vop_fsync_args *); |
| 46 | static int hammer_vop_read(struct vop_read_args *); |
| 47 | static int hammer_vop_write(struct vop_write_args *); |
| 48 | static int hammer_vop_access(struct vop_access_args *); |
| 49 | static int hammer_vop_advlock(struct vop_advlock_args *); |
| 50 | static int hammer_vop_close(struct vop_close_args *); |
| 51 | static int hammer_vop_ncreate(struct vop_ncreate_args *); |
| 52 | static int hammer_vop_getattr(struct vop_getattr_args *); |
| 53 | static int hammer_vop_nresolve(struct vop_nresolve_args *); |
| 54 | static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); |
| 55 | static int hammer_vop_nlink(struct vop_nlink_args *); |
| 56 | static int hammer_vop_nmkdir(struct vop_nmkdir_args *); |
| 57 | static int hammer_vop_nmknod(struct vop_nmknod_args *); |
| 58 | static int hammer_vop_open(struct vop_open_args *); |
| 59 | static int hammer_vop_print(struct vop_print_args *); |
| 60 | static int hammer_vop_readdir(struct vop_readdir_args *); |
| 61 | static int hammer_vop_readlink(struct vop_readlink_args *); |
| 62 | static int hammer_vop_nremove(struct vop_nremove_args *); |
| 63 | static int hammer_vop_nrename(struct vop_nrename_args *); |
| 64 | static int hammer_vop_nrmdir(struct vop_nrmdir_args *); |
| 65 | static int hammer_vop_markatime(struct vop_markatime_args *); |
| 66 | static int hammer_vop_setattr(struct vop_setattr_args *); |
| 67 | static int hammer_vop_strategy(struct vop_strategy_args *); |
| 68 | static int hammer_vop_bmap(struct vop_bmap_args *ap); |
| 69 | static int hammer_vop_nsymlink(struct vop_nsymlink_args *); |
| 70 | static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *); |
| 71 | static int hammer_vop_ioctl(struct vop_ioctl_args *); |
| 72 | static int hammer_vop_mountctl(struct vop_mountctl_args *); |
| 73 | static int hammer_vop_kqfilter (struct vop_kqfilter_args *); |
| 74 | |
| 75 | static int hammer_vop_fifoclose (struct vop_close_args *); |
| 76 | static int hammer_vop_fiforead (struct vop_read_args *); |
| 77 | static int hammer_vop_fifowrite (struct vop_write_args *); |
| 78 | static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *); |
| 79 | |
| 80 | struct vop_ops hammer_vnode_vops = { |
| 81 | .vop_default = vop_defaultop, |
| 82 | .vop_fsync = hammer_vop_fsync, |
| 83 | .vop_getpages = vop_stdgetpages, |
| 84 | .vop_putpages = vop_stdputpages, |
| 85 | .vop_read = hammer_vop_read, |
| 86 | .vop_write = hammer_vop_write, |
| 87 | .vop_access = hammer_vop_access, |
| 88 | .vop_advlock = hammer_vop_advlock, |
| 89 | .vop_close = hammer_vop_close, |
| 90 | .vop_ncreate = hammer_vop_ncreate, |
| 91 | .vop_getattr = hammer_vop_getattr, |
| 92 | .vop_inactive = hammer_vop_inactive, |
| 93 | .vop_reclaim = hammer_vop_reclaim, |
| 94 | .vop_nresolve = hammer_vop_nresolve, |
| 95 | .vop_nlookupdotdot = hammer_vop_nlookupdotdot, |
| 96 | .vop_nlink = hammer_vop_nlink, |
| 97 | .vop_nmkdir = hammer_vop_nmkdir, |
| 98 | .vop_nmknod = hammer_vop_nmknod, |
| 99 | .vop_open = hammer_vop_open, |
| 100 | .vop_pathconf = vop_stdpathconf, |
| 101 | .vop_print = hammer_vop_print, |
| 102 | .vop_readdir = hammer_vop_readdir, |
| 103 | .vop_readlink = hammer_vop_readlink, |
| 104 | .vop_nremove = hammer_vop_nremove, |
| 105 | .vop_nrename = hammer_vop_nrename, |
| 106 | .vop_nrmdir = hammer_vop_nrmdir, |
| 107 | .vop_markatime = hammer_vop_markatime, |
| 108 | .vop_setattr = hammer_vop_setattr, |
| 109 | .vop_bmap = hammer_vop_bmap, |
| 110 | .vop_strategy = hammer_vop_strategy, |
| 111 | .vop_nsymlink = hammer_vop_nsymlink, |
| 112 | .vop_nwhiteout = hammer_vop_nwhiteout, |
| 113 | .vop_ioctl = hammer_vop_ioctl, |
| 114 | .vop_mountctl = hammer_vop_mountctl, |
| 115 | .vop_kqfilter = hammer_vop_kqfilter |
| 116 | }; |
| 117 | |
| 118 | struct vop_ops hammer_spec_vops = { |
| 119 | .vop_default = vop_defaultop, |
| 120 | .vop_fsync = hammer_vop_fsync, |
| 121 | .vop_read = vop_stdnoread, |
| 122 | .vop_write = vop_stdnowrite, |
| 123 | .vop_access = hammer_vop_access, |
| 124 | .vop_close = hammer_vop_close, |
| 125 | .vop_markatime = hammer_vop_markatime, |
| 126 | .vop_getattr = hammer_vop_getattr, |
| 127 | .vop_inactive = hammer_vop_inactive, |
| 128 | .vop_reclaim = hammer_vop_reclaim, |
| 129 | .vop_setattr = hammer_vop_setattr |
| 130 | }; |
| 131 | |
| 132 | struct vop_ops hammer_fifo_vops = { |
| 133 | .vop_default = fifo_vnoperate, |
| 134 | .vop_fsync = hammer_vop_fsync, |
| 135 | .vop_read = hammer_vop_fiforead, |
| 136 | .vop_write = hammer_vop_fifowrite, |
| 137 | .vop_access = hammer_vop_access, |
| 138 | .vop_close = hammer_vop_fifoclose, |
| 139 | .vop_markatime = hammer_vop_markatime, |
| 140 | .vop_getattr = hammer_vop_getattr, |
| 141 | .vop_inactive = hammer_vop_inactive, |
| 142 | .vop_reclaim = hammer_vop_reclaim, |
| 143 | .vop_setattr = hammer_vop_setattr, |
| 144 | .vop_kqfilter = hammer_vop_fifokqfilter |
| 145 | }; |
| 146 | |
| 147 | static __inline |
| 148 | void |
| 149 | hammer_knote(struct vnode *vp, int flags) |
| 150 | { |
| 151 | if (flags) |
| 152 | KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); |
| 153 | } |
| 154 | |
| 155 | static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, |
| 156 | struct vnode *dvp, struct ucred *cred, |
| 157 | int flags, int isdir); |
| 158 | static int hammer_vop_strategy_read(struct vop_strategy_args *ap); |
| 159 | static int hammer_vop_strategy_write(struct vop_strategy_args *ap); |
| 160 | |
| 161 | /* |
| 162 | * hammer_vop_fsync { vp, waitfor } |
| 163 | * |
| 164 | * fsync() an inode to disk and wait for it to be completely committed |
| 165 | * such that the information would not be undone if a crash occured after |
| 166 | * return. |
| 167 | * |
| 168 | * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement |
| 169 | * a REDO log. A sysctl is provided to relax HAMMER's fsync() |
| 170 | * operation. |
| 171 | * |
| 172 | * Ultimately the combination of a REDO log and use of fast storage |
| 173 | * to front-end cluster caches will make fsync fast, but it aint |
| 174 | * here yet. And, in anycase, we need real transactional |
| 175 | * all-or-nothing features which are not restricted to a single file. |
| 176 | */ |
| 177 | static |
| 178 | int |
| 179 | hammer_vop_fsync(struct vop_fsync_args *ap) |
| 180 | { |
| 181 | hammer_inode_t ip = VTOI(ap->a_vp); |
| 182 | hammer_mount_t hmp = ip->hmp; |
| 183 | int waitfor = ap->a_waitfor; |
| 184 | int mode; |
| 185 | |
| 186 | lwkt_gettoken(&hmp->fs_token); |
| 187 | |
| 188 | /* |
| 189 | * Fsync rule relaxation (default is either full synchronous flush |
| 190 | * or REDO semantics with synchronous flush). |
| 191 | */ |
| 192 | if (ap->a_flags & VOP_FSYNC_SYSCALL) { |
| 193 | switch(hammer_fsync_mode) { |
| 194 | case 0: |
| 195 | mode0: |
| 196 | /* no REDO, full synchronous flush */ |
| 197 | goto skip; |
| 198 | case 1: |
| 199 | mode1: |
| 200 | /* no REDO, full asynchronous flush */ |
| 201 | if (waitfor == MNT_WAIT) |
| 202 | waitfor = MNT_NOWAIT; |
| 203 | goto skip; |
| 204 | case 2: |
| 205 | /* REDO semantics, synchronous flush */ |
| 206 | if (hmp->version < HAMMER_VOL_VERSION_FOUR) |
| 207 | goto mode0; |
| 208 | mode = HAMMER_FLUSH_UNDOS_AUTO; |
| 209 | break; |
| 210 | case 3: |
| 211 | /* REDO semantics, relaxed asynchronous flush */ |
| 212 | if (hmp->version < HAMMER_VOL_VERSION_FOUR) |
| 213 | goto mode1; |
| 214 | mode = HAMMER_FLUSH_UNDOS_RELAXED; |
| 215 | if (waitfor == MNT_WAIT) |
| 216 | waitfor = MNT_NOWAIT; |
| 217 | break; |
| 218 | case 4: |
| 219 | /* ignore the fsync() system call */ |
| 220 | lwkt_reltoken(&hmp->fs_token); |
| 221 | return(0); |
| 222 | default: |
| 223 | /* we have to do something */ |
| 224 | mode = HAMMER_FLUSH_UNDOS_RELAXED; |
| 225 | if (waitfor == MNT_WAIT) |
| 226 | waitfor = MNT_NOWAIT; |
| 227 | break; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Fast fsync only needs to flush the UNDO/REDO fifo if |
| 232 | * HAMMER_INODE_REDO is non-zero and the only modifications |
| 233 | * made to the file are write or write-extends. |
| 234 | */ |
| 235 | if ((ip->flags & HAMMER_INODE_REDO) && |
| 236 | (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0) { |
| 237 | ++hammer_count_fsyncs; |
| 238 | hammer_flusher_flush_undos(hmp, mode); |
| 239 | ip->redo_count = 0; |
| 240 | if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0) |
| 241 | vclrisdirty(ip->vp); |
| 242 | lwkt_reltoken(&hmp->fs_token); |
| 243 | return(0); |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * REDO is enabled by fsync(), the idea being we really only |
| 248 | * want to lay down REDO records when programs are using |
| 249 | * fsync() heavily. The first fsync() on the file starts |
| 250 | * the gravy train going and later fsync()s keep it hot by |
| 251 | * resetting the redo_count. |
| 252 | * |
| 253 | * We weren't running REDOs before now so we have to fall |
| 254 | * through and do a full fsync of what we have. |
| 255 | */ |
| 256 | if (hmp->version >= HAMMER_VOL_VERSION_FOUR && |
| 257 | (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) { |
| 258 | ip->flags |= HAMMER_INODE_REDO; |
| 259 | ip->redo_count = 0; |
| 260 | } |
| 261 | } |
| 262 | skip: |
| 263 | |
| 264 | /* |
| 265 | * Do a full flush sequence. |
| 266 | * |
| 267 | * Attempt to release the vnode while waiting for the inode to |
| 268 | * finish flushing. This can really mess up inactive->reclaim |
| 269 | * sequences so only do it if the vnode is active. |
| 270 | * |
| 271 | * WARNING! The VX lock functions must be used. vn_lock() will |
| 272 | * fail when this is part of a VOP_RECLAIM sequence. |
| 273 | */ |
| 274 | ++hammer_count_fsyncs; |
| 275 | vfsync(ap->a_vp, waitfor, 1, NULL, NULL); |
| 276 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 277 | if (waitfor == MNT_WAIT) { |
| 278 | int dorelock; |
| 279 | |
| 280 | if ((ap->a_vp->v_flag & VRECLAIMED) == 0) { |
| 281 | vn_unlock(ap->a_vp); |
| 282 | dorelock = 1; |
| 283 | } else { |
| 284 | dorelock = 0; |
| 285 | } |
| 286 | hammer_wait_inode(ip); |
| 287 | if (dorelock) |
| 288 | vn_relock(ap->a_vp, LK_EXCLUSIVE); |
| 289 | } |
| 290 | if (ip->vp && (ip->flags & HAMMER_INODE_MODMASK) == 0) |
| 291 | vclrisdirty(ip->vp); |
| 292 | lwkt_reltoken(&hmp->fs_token); |
| 293 | return (ip->error); |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * hammer_vop_read { vp, uio, ioflag, cred } |
| 298 | * |
| 299 | * MPSAFE (for the cache safe does not require fs_token) |
| 300 | */ |
| 301 | static |
| 302 | int |
| 303 | hammer_vop_read(struct vop_read_args *ap) |
| 304 | { |
| 305 | struct hammer_transaction trans; |
| 306 | hammer_inode_t ip; |
| 307 | hammer_mount_t hmp; |
| 308 | off_t offset; |
| 309 | struct buf *bp; |
| 310 | struct uio *uio; |
| 311 | int error; |
| 312 | int n; |
| 313 | int seqcount; |
| 314 | int ioseqcount; |
| 315 | int blksize; |
| 316 | int bigread; |
| 317 | int got_trans; |
| 318 | size_t resid; |
| 319 | |
| 320 | if (ap->a_vp->v_type == VDIR) |
| 321 | return (EISDIR); |
| 322 | if (ap->a_vp->v_type != VREG) |
| 323 | return (EINVAL); |
| 324 | ip = VTOI(ap->a_vp); |
| 325 | hmp = ip->hmp; |
| 326 | error = 0; |
| 327 | got_trans = 0; |
| 328 | uio = ap->a_uio; |
| 329 | |
| 330 | /* |
| 331 | * Attempt to shortcut directly to the VM object using lwbufs. |
| 332 | * This is much faster than instantiating buffer cache buffers. |
| 333 | */ |
| 334 | resid = uio->uio_resid; |
| 335 | error = vop_helper_read_shortcut(ap); |
| 336 | hammer_stats_file_read += resid - uio->uio_resid; |
| 337 | if (error) |
| 338 | return (error); |
| 339 | if (uio->uio_resid == 0) |
| 340 | goto finished; |
| 341 | |
| 342 | /* |
| 343 | * Allow the UIO's size to override the sequential heuristic. |
| 344 | */ |
| 345 | blksize = hammer_blocksize(uio->uio_offset); |
| 346 | seqcount = howmany(uio->uio_resid, MAXBSIZE); |
| 347 | ioseqcount = ap->a_ioflag >> IO_SEQSHIFT; |
| 348 | if (seqcount < ioseqcount) |
| 349 | seqcount = ioseqcount; |
| 350 | |
| 351 | /* |
| 352 | * If reading or writing a huge amount of data we have to break |
| 353 | * atomicy and allow the operation to be interrupted by a signal |
| 354 | * or it can DOS the machine. |
| 355 | */ |
| 356 | bigread = (uio->uio_resid > 100 * 1024 * 1024); |
| 357 | |
| 358 | /* |
| 359 | * Access the data typically in HAMMER_BUFSIZE blocks via the |
| 360 | * buffer cache, but HAMMER may use a variable block size based |
| 361 | * on the offset. |
| 362 | * |
| 363 | * XXX Temporary hack, delay the start transaction while we remain |
| 364 | * MPSAFE. NOTE: ino_data.size cannot change while vnode is |
| 365 | * locked-shared. |
| 366 | */ |
| 367 | while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) { |
| 368 | int64_t base_offset; |
| 369 | int64_t file_limit; |
| 370 | |
| 371 | blksize = hammer_blocksize(uio->uio_offset); |
| 372 | offset = (int)uio->uio_offset & (blksize - 1); |
| 373 | base_offset = uio->uio_offset - offset; |
| 374 | |
| 375 | if (bigread && (error = hammer_signal_check(ip->hmp)) != 0) |
| 376 | break; |
| 377 | |
| 378 | /* |
| 379 | * MPSAFE |
| 380 | */ |
| 381 | bp = getblk(ap->a_vp, base_offset, blksize, 0, 0); |
| 382 | if ((bp->b_flags & (B_INVAL | B_CACHE | B_RAM)) == B_CACHE) { |
| 383 | bp->b_flags &= ~B_AGE; |
| 384 | error = 0; |
| 385 | goto skip; |
| 386 | } |
| 387 | if (ap->a_ioflag & IO_NRDELAY) { |
| 388 | bqrelse(bp); |
| 389 | return (EWOULDBLOCK); |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * MPUNSAFE |
| 394 | */ |
| 395 | if (got_trans == 0) { |
| 396 | hammer_start_transaction(&trans, ip->hmp); |
| 397 | got_trans = 1; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * NOTE: A valid bp has already been acquired, but was not |
| 402 | * B_CACHE. |
| 403 | */ |
| 404 | if (hammer_cluster_enable) { |
| 405 | /* |
| 406 | * Use file_limit to prevent cluster_read() from |
| 407 | * creating buffers of the wrong block size past |
| 408 | * the demarc. |
| 409 | */ |
| 410 | file_limit = ip->ino_data.size; |
| 411 | if (base_offset < HAMMER_XDEMARC && |
| 412 | file_limit > HAMMER_XDEMARC) { |
| 413 | file_limit = HAMMER_XDEMARC; |
| 414 | } |
| 415 | error = cluster_readx(ap->a_vp, |
| 416 | file_limit, base_offset, |
| 417 | blksize, B_NOTMETA, |
| 418 | uio->uio_resid, |
| 419 | seqcount * MAXBSIZE, |
| 420 | &bp); |
| 421 | } else { |
| 422 | error = breadnx(ap->a_vp, base_offset, |
| 423 | blksize, B_NOTMETA, |
| 424 | NULL, NULL, 0, &bp); |
| 425 | } |
| 426 | if (error) { |
| 427 | brelse(bp); |
| 428 | break; |
| 429 | } |
| 430 | skip: |
| 431 | if ((hammer_debug_io & 0x0001) && (bp->b_flags & B_IOISSUED)) { |
| 432 | hdkprintf("zone2_offset %016jx read file %016jx@%016jx\n", |
| 433 | (intmax_t)bp->b_bio2.bio_offset, |
| 434 | (intmax_t)ip->obj_id, |
| 435 | (intmax_t)bp->b_loffset); |
| 436 | } |
| 437 | bp->b_flags &= ~B_IOISSUED; |
| 438 | if (blksize == HAMMER_XBUFSIZE) |
| 439 | bp->b_flags |= B_CLUSTEROK; |
| 440 | |
| 441 | n = blksize - offset; |
| 442 | if (n > uio->uio_resid) |
| 443 | n = uio->uio_resid; |
| 444 | if (n > ip->ino_data.size - uio->uio_offset) |
| 445 | n = (int)(ip->ino_data.size - uio->uio_offset); |
| 446 | |
| 447 | /* |
| 448 | * Set B_AGE, data has a lower priority than meta-data. |
| 449 | * |
| 450 | * Use a hold/unlock/drop sequence to run the uiomove |
| 451 | * with the buffer unlocked, avoiding deadlocks against |
| 452 | * read()s on mmap()'d spaces. |
| 453 | */ |
| 454 | bp->b_flags |= B_AGE; |
| 455 | error = uiomovebp(bp, (char *)bp->b_data + offset, n, uio); |
| 456 | bqrelse(bp); |
| 457 | |
| 458 | if (error) |
| 459 | break; |
| 460 | hammer_stats_file_read += n; |
| 461 | } |
| 462 | |
| 463 | finished: |
| 464 | |
| 465 | /* |
| 466 | * Try to update the atime with just the inode lock for maximum |
| 467 | * concurrency. If we can't shortcut it we have to get the full |
| 468 | * blown transaction. |
| 469 | */ |
| 470 | if (got_trans == 0 && hammer_update_atime_quick(ip) < 0) { |
| 471 | hammer_start_transaction(&trans, ip->hmp); |
| 472 | got_trans = 1; |
| 473 | } |
| 474 | |
| 475 | if (got_trans) { |
| 476 | if ((ip->flags & HAMMER_INODE_RO) == 0 && |
| 477 | (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) { |
| 478 | lwkt_gettoken(&hmp->fs_token); |
| 479 | ip->ino_data.atime = trans.time; |
| 480 | hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); |
| 481 | hammer_done_transaction(&trans); |
| 482 | lwkt_reltoken(&hmp->fs_token); |
| 483 | } else { |
| 484 | hammer_done_transaction(&trans); |
| 485 | } |
| 486 | } |
| 487 | return (error); |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * hammer_vop_write { vp, uio, ioflag, cred } |
| 492 | */ |
| 493 | static |
| 494 | int |
| 495 | hammer_vop_write(struct vop_write_args *ap) |
| 496 | { |
| 497 | struct hammer_transaction trans; |
| 498 | hammer_inode_t ip; |
| 499 | hammer_mount_t hmp; |
| 500 | thread_t td; |
| 501 | struct vnode *vp; |
| 502 | struct uio *uio; |
| 503 | int offset; |
| 504 | off_t base_offset; |
| 505 | int64_t cluster_eof; |
| 506 | struct buf *bp; |
| 507 | int kflags; |
| 508 | int error; |
| 509 | int n; |
| 510 | int flags; |
| 511 | int seqcount; |
| 512 | int bigwrite; |
| 513 | |
| 514 | vp = ap->a_vp; |
| 515 | if (vp->v_type != VREG) |
| 516 | return (EINVAL); |
| 517 | ip = VTOI(ap->a_vp); |
| 518 | hmp = ip->hmp; |
| 519 | error = 0; |
| 520 | kflags = 0; |
| 521 | seqcount = ap->a_ioflag >> IO_SEQSHIFT; |
| 522 | |
| 523 | if (ip->flags & HAMMER_INODE_RO) |
| 524 | return (EROFS); |
| 525 | |
| 526 | /* |
| 527 | * Create a transaction to cover the operations we perform. |
| 528 | */ |
| 529 | hammer_start_transaction(&trans, hmp); |
| 530 | uio = ap->a_uio; |
| 531 | |
| 532 | /* |
| 533 | * Use v_lastwrite_ts if file not open for writing |
| 534 | * (i.e. a late msync) |
| 535 | */ |
| 536 | if (uio->uio_segflg == UIO_NOCOPY) { |
| 537 | if (vp->v_flag & VLASTWRITETS) { |
| 538 | trans.time = vp->v_lastwrite_ts.tv_sec * 1000000 + |
| 539 | vp->v_lastwrite_ts.tv_nsec / 1000; |
| 540 | } else { |
| 541 | trans.time = ip->ino_data.mtime; |
| 542 | } |
| 543 | } else { |
| 544 | vclrflags(vp, VLASTWRITETS); |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * Check append mode |
| 549 | */ |
| 550 | if (ap->a_ioflag & IO_APPEND) |
| 551 | uio->uio_offset = ip->ino_data.size; |
| 552 | |
| 553 | /* |
| 554 | * Check for illegal write offsets. Valid range is 0...2^63-1. |
| 555 | * |
| 556 | * NOTE: the base_off assignment is required to work around what |
| 557 | * I consider to be a GCC-4 optimization bug. |
| 558 | */ |
| 559 | if (uio->uio_offset < 0) { |
| 560 | hammer_done_transaction(&trans); |
| 561 | return (EFBIG); |
| 562 | } |
| 563 | base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */ |
| 564 | if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) { |
| 565 | hammer_done_transaction(&trans); |
| 566 | return (EFBIG); |
| 567 | } |
| 568 | |
| 569 | if (uio->uio_resid > 0 && (td = uio->uio_td) != NULL && td->td_proc && |
| 570 | base_offset > td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { |
| 571 | hammer_done_transaction(&trans); |
| 572 | lwpsignal(td->td_proc, td->td_lwp, SIGXFSZ); |
| 573 | return (EFBIG); |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * If reading or writing a huge amount of data we have to break |
| 578 | * atomicy and allow the operation to be interrupted by a signal |
| 579 | * or it can DOS the machine. |
| 580 | * |
| 581 | * Preset redo_count so we stop generating REDOs earlier if the |
| 582 | * limit is exceeded. |
| 583 | * |
| 584 | * redo_count is heuristical, SMP races are ok |
| 585 | */ |
| 586 | bigwrite = (uio->uio_resid > 100 * 1024 * 1024); |
| 587 | if ((ip->flags & HAMMER_INODE_REDO) && |
| 588 | ip->redo_count < hammer_limit_redo) { |
| 589 | ip->redo_count += uio->uio_resid; |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * Access the data typically in HAMMER_BUFSIZE blocks via the |
| 594 | * buffer cache, but HAMMER may use a variable block size based |
| 595 | * on the offset. |
| 596 | */ |
| 597 | while (uio->uio_resid > 0) { |
| 598 | int fixsize = 0; |
| 599 | int blksize; |
| 600 | int blkmask; |
| 601 | int trivial; |
| 602 | int endofblk; |
| 603 | off_t nsize; |
| 604 | |
| 605 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0) |
| 606 | break; |
| 607 | if (bigwrite && (error = hammer_signal_check(hmp)) != 0) |
| 608 | break; |
| 609 | |
| 610 | blksize = hammer_blocksize(uio->uio_offset); |
| 611 | |
| 612 | /* |
| 613 | * Control the number of pending records associated with |
| 614 | * this inode. If too many have accumulated start a |
| 615 | * flush. Try to maintain a pipeline with the flusher. |
| 616 | * |
| 617 | * NOTE: It is possible for other sources to grow the |
| 618 | * records but not necessarily issue another flush, |
| 619 | * so use a timeout and ensure that a re-flush occurs. |
| 620 | */ |
| 621 | if (ip->rsv_recs >= hammer_limit_inode_recs) { |
| 622 | lwkt_gettoken(&hmp->fs_token); |
| 623 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 624 | while (ip->rsv_recs >= hammer_limit_inode_recs * 2) { |
| 625 | ip->flags |= HAMMER_INODE_RECSW; |
| 626 | tsleep(&ip->rsv_recs, 0, "hmrwww", hz); |
| 627 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 628 | } |
| 629 | lwkt_reltoken(&hmp->fs_token); |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * Do not allow HAMMER to blow out the buffer cache. Very |
| 634 | * large UIOs can lockout other processes due to bwillwrite() |
| 635 | * mechanics. |
| 636 | * |
| 637 | * The hammer inode is not locked during these operations. |
| 638 | * The vnode is locked which can interfere with the pageout |
| 639 | * daemon for non-UIO_NOCOPY writes but should not interfere |
| 640 | * with the buffer cache. Even so, we cannot afford to |
| 641 | * allow the pageout daemon to build up too many dirty buffer |
| 642 | * cache buffers. |
| 643 | * |
| 644 | * Only call this if we aren't being recursively called from |
| 645 | * a virtual disk device (vn), else we may deadlock. |
| 646 | */ |
| 647 | if ((ap->a_ioflag & IO_RECURSE) == 0) |
| 648 | bwillwrite(blksize); |
| 649 | |
| 650 | /* |
| 651 | * Calculate the blocksize at the current offset and figure |
| 652 | * out how much we can actually write. |
| 653 | */ |
| 654 | blkmask = blksize - 1; |
| 655 | offset = (int)uio->uio_offset & blkmask; |
| 656 | base_offset = uio->uio_offset & ~(int64_t)blkmask; |
| 657 | n = blksize - offset; |
| 658 | if (n > uio->uio_resid) { |
| 659 | n = uio->uio_resid; |
| 660 | endofblk = 0; |
| 661 | } else { |
| 662 | endofblk = 1; |
| 663 | } |
| 664 | nsize = uio->uio_offset + n; |
| 665 | if (nsize > ip->ino_data.size) { |
| 666 | if (uio->uio_offset > ip->ino_data.size) |
| 667 | trivial = 0; |
| 668 | else |
| 669 | trivial = NVEXTF_TRIVIAL; |
| 670 | nvextendbuf(ap->a_vp, |
| 671 | ip->ino_data.size, |
| 672 | nsize, |
| 673 | hammer_blocksize(ip->ino_data.size), |
| 674 | hammer_blocksize(nsize), |
| 675 | hammer_blockoff(ip->ino_data.size), |
| 676 | hammer_blockoff(nsize), |
| 677 | trivial); |
| 678 | fixsize = 1; |
| 679 | kflags |= NOTE_EXTEND; |
| 680 | } |
| 681 | |
| 682 | if (uio->uio_segflg == UIO_NOCOPY) { |
| 683 | /* |
| 684 | * Issuing a write with the same data backing the |
| 685 | * buffer. Instantiate the buffer to collect the |
| 686 | * backing vm pages, then read-in any missing bits. |
| 687 | * |
| 688 | * This case is used by vop_stdputpages(). |
| 689 | */ |
| 690 | bp = getblk(ap->a_vp, base_offset, |
| 691 | blksize, GETBLK_BHEAVY, 0); |
| 692 | if ((bp->b_flags & B_CACHE) == 0) { |
| 693 | bqrelse(bp); |
| 694 | error = bread(ap->a_vp, base_offset, |
| 695 | blksize, &bp); |
| 696 | } |
| 697 | } else if (offset == 0 && uio->uio_resid >= blksize) { |
| 698 | /* |
| 699 | * Even though we are entirely overwriting the buffer |
| 700 | * we may still have to zero it out to avoid a |
| 701 | * mmap/write visibility issue. |
| 702 | */ |
| 703 | bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0); |
| 704 | if ((bp->b_flags & B_CACHE) == 0) |
| 705 | vfs_bio_clrbuf(bp); |
| 706 | } else if (base_offset >= ip->ino_data.size) { |
| 707 | /* |
| 708 | * If the base offset of the buffer is beyond the |
| 709 | * file EOF, we don't have to issue a read. |
| 710 | */ |
| 711 | bp = getblk(ap->a_vp, base_offset, |
| 712 | blksize, GETBLK_BHEAVY, 0); |
| 713 | vfs_bio_clrbuf(bp); |
| 714 | } else { |
| 715 | /* |
| 716 | * Partial overwrite, read in any missing bits then |
| 717 | * replace the portion being written. |
| 718 | */ |
| 719 | error = bread(ap->a_vp, base_offset, blksize, &bp); |
| 720 | if (error == 0) |
| 721 | bheavy(bp); |
| 722 | } |
| 723 | if (error == 0) |
| 724 | error = uiomovebp(bp, bp->b_data + offset, n, uio); |
| 725 | |
| 726 | lwkt_gettoken(&hmp->fs_token); |
| 727 | |
| 728 | /* |
| 729 | * Generate REDO records if enabled and redo_count will not |
| 730 | * exceeded the limit. |
| 731 | * |
| 732 | * If redo_count exceeds the limit we stop generating records |
| 733 | * and clear HAMMER_INODE_REDO. This will cause the next |
| 734 | * fsync() to do a full meta-data sync instead of just an |
| 735 | * UNDO/REDO fifo update. |
| 736 | * |
| 737 | * When clearing HAMMER_INODE_REDO any pre-existing REDOs |
| 738 | * will still be tracked. The tracks will be terminated |
| 739 | * when the related meta-data (including possible data |
| 740 | * modifications which are not tracked via REDO) is |
| 741 | * flushed. |
| 742 | */ |
| 743 | if ((ip->flags & HAMMER_INODE_REDO) && error == 0) { |
| 744 | if (ip->redo_count < hammer_limit_redo) { |
| 745 | bp->b_flags |= B_VFSFLAG1; |
| 746 | error = hammer_generate_redo(&trans, ip, |
| 747 | base_offset + offset, |
| 748 | HAMMER_REDO_WRITE, |
| 749 | bp->b_data + offset, |
| 750 | (size_t)n); |
| 751 | } else { |
| 752 | ip->flags &= ~HAMMER_INODE_REDO; |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | /* |
| 757 | * If we screwed up we have to undo any VM size changes we |
| 758 | * made. |
| 759 | */ |
| 760 | if (error) { |
| 761 | brelse(bp); |
| 762 | if (fixsize) { |
| 763 | nvtruncbuf(ap->a_vp, ip->ino_data.size, |
| 764 | hammer_blocksize(ip->ino_data.size), |
| 765 | hammer_blockoff(ip->ino_data.size), |
| 766 | 0); |
| 767 | } |
| 768 | lwkt_reltoken(&hmp->fs_token); |
| 769 | break; |
| 770 | } |
| 771 | kflags |= NOTE_WRITE; |
| 772 | hammer_stats_file_write += n; |
| 773 | if (blksize == HAMMER_XBUFSIZE) |
| 774 | bp->b_flags |= B_CLUSTEROK; |
| 775 | if (ip->ino_data.size < uio->uio_offset) { |
| 776 | ip->ino_data.size = uio->uio_offset; |
| 777 | flags = HAMMER_INODE_SDIRTY; |
| 778 | } else { |
| 779 | flags = 0; |
| 780 | } |
| 781 | ip->ino_data.mtime = trans.time; |
| 782 | flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS; |
| 783 | hammer_modify_inode(&trans, ip, flags); |
| 784 | |
| 785 | /* |
| 786 | * Once we dirty the buffer any cached zone-X offset |
| 787 | * becomes invalid. HAMMER NOTE: no-history mode cannot |
| 788 | * allow overwriting over the same data sector unless |
| 789 | * we provide UNDOs for the old data, which we don't. |
| 790 | */ |
| 791 | bp->b_bio2.bio_offset = NOOFFSET; |
| 792 | |
| 793 | lwkt_reltoken(&hmp->fs_token); |
| 794 | |
| 795 | /* |
| 796 | * Final buffer disposition. |
| 797 | * |
| 798 | * Because meta-data updates are deferred, HAMMER is |
| 799 | * especially sensitive to excessive bdwrite()s because |
| 800 | * the I/O stream is not broken up by disk reads. So the |
| 801 | * buffer cache simply cannot keep up. |
| 802 | * |
| 803 | * WARNING! blksize is variable. cluster_write() is |
| 804 | * expected to not blow up if it encounters |
| 805 | * buffers that do not match the passed blksize. |
| 806 | * |
| 807 | * NOTE! Hammer shouldn't need to bawrite()/cluster_write(). |
| 808 | * The ip->rsv_recs check should burst-flush the data. |
| 809 | * If we queue it immediately the buf could be left |
| 810 | * locked on the device queue for a very long time. |
| 811 | * |
| 812 | * However, failing to flush a dirty buffer out when |
| 813 | * issued from the pageout daemon can result in a low |
| 814 | * memory deadlock against bio_page_alloc(), so we |
| 815 | * have to bawrite() on IO_ASYNC as well. |
| 816 | * |
| 817 | * NOTE! To avoid degenerate stalls due to mismatched block |
| 818 | * sizes we only honor IO_DIRECT on the write which |
| 819 | * abuts the end of the buffer. However, we must |
| 820 | * honor IO_SYNC in case someone is silly enough to |
| 821 | * configure a HAMMER file as swap, or when HAMMER |
| 822 | * is serving NFS (for commits). Ick ick. |
| 823 | */ |
| 824 | bp->b_flags |= B_AGE; |
| 825 | if (blksize == HAMMER_XBUFSIZE) |
| 826 | bp->b_flags |= B_CLUSTEROK; |
| 827 | |
| 828 | if (ap->a_ioflag & IO_SYNC) { |
| 829 | bwrite(bp); |
| 830 | } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) { |
| 831 | bawrite(bp); |
| 832 | } else if (ap->a_ioflag & IO_ASYNC) { |
| 833 | bawrite(bp); |
| 834 | } else if (hammer_cluster_enable && |
| 835 | !(ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) { |
| 836 | if (base_offset < HAMMER_XDEMARC) |
| 837 | cluster_eof = hammer_blockdemarc(base_offset, |
| 838 | ip->ino_data.size); |
| 839 | else |
| 840 | cluster_eof = ip->ino_data.size; |
| 841 | cluster_write(bp, cluster_eof, blksize, seqcount); |
| 842 | } else { |
| 843 | bdwrite(bp); |
| 844 | } |
| 845 | } |
| 846 | hammer_done_transaction(&trans); |
| 847 | hammer_knote(ap->a_vp, kflags); |
| 848 | |
| 849 | return (error); |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * hammer_vop_access { vp, mode, cred } |
| 854 | * |
| 855 | * MPSAFE - does not require fs_token |
| 856 | */ |
| 857 | static |
| 858 | int |
| 859 | hammer_vop_access(struct vop_access_args *ap) |
| 860 | { |
| 861 | hammer_inode_t ip = VTOI(ap->a_vp); |
| 862 | uid_t uid; |
| 863 | gid_t gid; |
| 864 | int error; |
| 865 | |
| 866 | uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 867 | gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 868 | |
| 869 | error = vop_helper_access(ap, uid, gid, ip->ino_data.mode, |
| 870 | ip->ino_data.uflags); |
| 871 | return (error); |
| 872 | } |
| 873 | |
| 874 | /* |
| 875 | * hammer_vop_advlock { vp, id, op, fl, flags } |
| 876 | * |
| 877 | * MPSAFE - does not require fs_token |
| 878 | */ |
| 879 | static |
| 880 | int |
| 881 | hammer_vop_advlock(struct vop_advlock_args *ap) |
| 882 | { |
| 883 | hammer_inode_t ip = VTOI(ap->a_vp); |
| 884 | |
| 885 | return (lf_advlock(ap, &ip->advlock, ip->ino_data.size)); |
| 886 | } |
| 887 | |
| 888 | /* |
| 889 | * hammer_vop_close { vp, fflag } |
| 890 | * |
| 891 | * We can only sync-on-close for normal closes. XXX disabled for now. |
| 892 | */ |
| 893 | static |
| 894 | int |
| 895 | hammer_vop_close(struct vop_close_args *ap) |
| 896 | { |
| 897 | #if 0 |
| 898 | struct vnode *vp = ap->a_vp; |
| 899 | hammer_inode_t ip = VTOI(vp); |
| 900 | int waitfor; |
| 901 | if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) { |
| 902 | if (vn_islocked(vp) == LK_EXCLUSIVE && |
| 903 | (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) { |
| 904 | if (ip->flags & HAMMER_INODE_CLOSESYNC) |
| 905 | waitfor = MNT_WAIT; |
| 906 | else |
| 907 | waitfor = MNT_NOWAIT; |
| 908 | ip->flags &= ~(HAMMER_INODE_CLOSESYNC | |
| 909 | HAMMER_INODE_CLOSEASYNC); |
| 910 | VOP_FSYNC(vp, MNT_NOWAIT, waitfor); |
| 911 | } |
| 912 | } |
| 913 | #endif |
| 914 | return (vop_stdclose(ap)); |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * hammer_vop_ncreate { nch, dvp, vpp, cred, vap } |
| 919 | * |
| 920 | * The operating system has already ensured that the directory entry |
| 921 | * does not exist and done all appropriate namespace locking. |
| 922 | */ |
| 923 | static |
| 924 | int |
| 925 | hammer_vop_ncreate(struct vop_ncreate_args *ap) |
| 926 | { |
| 927 | struct hammer_transaction trans; |
| 928 | hammer_inode_t dip; |
| 929 | hammer_inode_t nip; |
| 930 | struct nchandle *nch; |
| 931 | hammer_mount_t hmp; |
| 932 | int error; |
| 933 | |
| 934 | nch = ap->a_nch; |
| 935 | dip = VTOI(ap->a_dvp); |
| 936 | hmp = dip->hmp; |
| 937 | |
| 938 | if (dip->flags & HAMMER_INODE_RO) |
| 939 | return (EROFS); |
| 940 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 941 | return (error); |
| 942 | |
| 943 | /* |
| 944 | * Create a transaction to cover the operations we perform. |
| 945 | */ |
| 946 | lwkt_gettoken(&hmp->fs_token); |
| 947 | hammer_start_transaction(&trans, hmp); |
| 948 | |
| 949 | /* |
| 950 | * Create a new filesystem object of the requested type. The |
| 951 | * returned inode will be referenced and shared-locked to prevent |
| 952 | * it from being moved to the flusher. |
| 953 | */ |
| 954 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 955 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 956 | NULL, &nip); |
| 957 | if (error) { |
| 958 | hkprintf("hammer_create_inode error %d\n", error); |
| 959 | hammer_done_transaction(&trans); |
| 960 | *ap->a_vpp = NULL; |
| 961 | lwkt_reltoken(&hmp->fs_token); |
| 962 | return (error); |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * Add the new filesystem object to the directory. This will also |
| 967 | * bump the inode's link count. |
| 968 | */ |
| 969 | error = hammer_ip_add_direntry(&trans, dip, |
| 970 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 971 | nip); |
| 972 | if (error) |
| 973 | hkprintf("hammer_ip_add_direntry error %d\n", error); |
| 974 | |
| 975 | /* |
| 976 | * Finish up. |
| 977 | */ |
| 978 | if (error) { |
| 979 | hammer_rel_inode(nip, 0); |
| 980 | hammer_done_transaction(&trans); |
| 981 | *ap->a_vpp = NULL; |
| 982 | } else { |
| 983 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 984 | hammer_done_transaction(&trans); |
| 985 | hammer_rel_inode(nip, 0); |
| 986 | if (error == 0) { |
| 987 | cache_setunresolved(ap->a_nch); |
| 988 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 989 | } |
| 990 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 991 | } |
| 992 | lwkt_reltoken(&hmp->fs_token); |
| 993 | return (error); |
| 994 | } |
| 995 | |
| 996 | /* |
| 997 | * hammer_vop_getattr { vp, vap } |
| 998 | * |
| 999 | * Retrieve an inode's attribute information. When accessing inodes |
| 1000 | * historically we fake the atime field to ensure consistent results. |
| 1001 | * The atime field is stored in the B-Tree element and allowed to be |
| 1002 | * updated without cycling the element. |
| 1003 | * |
| 1004 | * MPSAFE - does not require fs_token |
| 1005 | */ |
| 1006 | static |
| 1007 | int |
| 1008 | hammer_vop_getattr(struct vop_getattr_args *ap) |
| 1009 | { |
| 1010 | hammer_inode_t ip = VTOI(ap->a_vp); |
| 1011 | struct vattr *vap = ap->a_vap; |
| 1012 | |
| 1013 | /* |
| 1014 | * We want the fsid to be different when accessing a filesystem |
| 1015 | * with different as-of's so programs like diff don't think |
| 1016 | * the files are the same. |
| 1017 | * |
| 1018 | * We also want the fsid to be the same when comparing snapshots, |
| 1019 | * or when comparing mirrors (which might be backed by different |
| 1020 | * physical devices). HAMMER fsids are based on the PFS's |
| 1021 | * shared_uuid field. |
| 1022 | * |
| 1023 | * XXX there is a chance of collision here. The va_fsid reported |
| 1024 | * by stat is different from the more involved fsid used in the |
| 1025 | * mount structure. |
| 1026 | */ |
| 1027 | hammer_lock_sh(&ip->lock); |
| 1028 | vap->va_fsid = ip->pfsm->fsid_udev ^ (uint32_t)ip->obj_asof ^ |
| 1029 | (uint32_t)(ip->obj_asof >> 32); |
| 1030 | |
| 1031 | vap->va_fileid = ip->ino_leaf.base.obj_id; |
| 1032 | vap->va_mode = ip->ino_data.mode; |
| 1033 | vap->va_nlink = ip->ino_data.nlinks; |
| 1034 | vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 1035 | vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 1036 | vap->va_rmajor = 0; |
| 1037 | vap->va_rminor = 0; |
| 1038 | vap->va_size = ip->ino_data.size; |
| 1039 | |
| 1040 | /* |
| 1041 | * Special case for @@PFS softlinks. The actual size of the |
| 1042 | * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. |
| 1043 | * or for MAX_TID is "@@-1:%05d" == 10 bytes. |
| 1044 | * |
| 1045 | * Note that userspace hammer command does not allow users to |
| 1046 | * create a @@PFS softlink under an existing other PFS (id!=0) |
| 1047 | * so the ip localization here for @@PFS softlink is always 0. |
| 1048 | */ |
| 1049 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && |
| 1050 | ip->ino_data.size == 10 && |
| 1051 | ip->obj_asof == HAMMER_MAX_TID && |
| 1052 | ip->obj_localization == HAMMER_DEF_LOCALIZATION && |
| 1053 | strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { |
| 1054 | if (hammer_is_pfs_slave(&ip->pfsm->pfsd)) |
| 1055 | vap->va_size = 26; |
| 1056 | else |
| 1057 | vap->va_size = 10; |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * We must provide a consistent atime and mtime for snapshots |
| 1062 | * so people can do a 'tar cf - ... | md5' on them and get |
| 1063 | * consistent results. |
| 1064 | */ |
| 1065 | if (ip->flags & HAMMER_INODE_RO) { |
| 1066 | hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); |
| 1067 | hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); |
| 1068 | } else { |
| 1069 | hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); |
| 1070 | hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); |
| 1071 | } |
| 1072 | hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); |
| 1073 | vap->va_flags = ip->ino_data.uflags; |
| 1074 | vap->va_gen = 1; /* hammer inums are unique for all time */ |
| 1075 | vap->va_blocksize = HAMMER_BUFSIZE; |
| 1076 | if (ip->ino_data.size >= HAMMER_XDEMARC) { |
| 1077 | vap->va_bytes = HAMMER_XBUFSIZE64_DOALIGN(ip->ino_data.size); |
| 1078 | } else if (ip->ino_data.size > HAMMER_HBUFSIZE) { |
| 1079 | vap->va_bytes = HAMMER_BUFSIZE64_DOALIGN(ip->ino_data.size); |
| 1080 | } else { |
| 1081 | vap->va_bytes = HAMMER_DATA_DOALIGN(ip->ino_data.size); |
| 1082 | } |
| 1083 | |
| 1084 | vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); |
| 1085 | vap->va_filerev = 0; /* XXX */ |
| 1086 | vap->va_uid_uuid = ip->ino_data.uid; |
| 1087 | vap->va_gid_uuid = ip->ino_data.gid; |
| 1088 | vap->va_fsid_uuid = ip->hmp->fsid; |
| 1089 | vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | |
| 1090 | VA_FSID_UUID_VALID; |
| 1091 | |
| 1092 | switch (ip->ino_data.obj_type) { |
| 1093 | case HAMMER_OBJTYPE_CDEV: |
| 1094 | case HAMMER_OBJTYPE_BDEV: |
| 1095 | vap->va_rmajor = ip->ino_data.rmajor; |
| 1096 | vap->va_rminor = ip->ino_data.rminor; |
| 1097 | break; |
| 1098 | default: |
| 1099 | break; |
| 1100 | } |
| 1101 | hammer_unlock(&ip->lock); |
| 1102 | return(0); |
| 1103 | } |
| 1104 | |
| 1105 | /* |
| 1106 | * hammer_vop_nresolve { nch, dvp, cred } |
| 1107 | * |
| 1108 | * Locate the requested directory entry. |
| 1109 | */ |
| 1110 | static |
| 1111 | int |
| 1112 | hammer_vop_nresolve(struct vop_nresolve_args *ap) |
| 1113 | { |
| 1114 | struct hammer_transaction trans; |
| 1115 | struct namecache *ncp; |
| 1116 | hammer_mount_t hmp; |
| 1117 | hammer_inode_t dip; |
| 1118 | hammer_inode_t ip; |
| 1119 | hammer_tid_t asof; |
| 1120 | struct hammer_cursor cursor; |
| 1121 | struct vnode *vp; |
| 1122 | int64_t namekey; |
| 1123 | int error; |
| 1124 | int i; |
| 1125 | int nlen; |
| 1126 | int flags; |
| 1127 | int ispfs; |
| 1128 | int64_t obj_id; |
| 1129 | uint32_t localization; |
| 1130 | uint32_t max_iterations; |
| 1131 | |
| 1132 | /* |
| 1133 | * Misc initialization, plus handle as-of name extensions. Look for |
| 1134 | * the '@@' extension. Note that as-of files and directories cannot |
| 1135 | * be modified. |
| 1136 | */ |
| 1137 | dip = VTOI(ap->a_dvp); |
| 1138 | ncp = ap->a_nch->ncp; |
| 1139 | asof = dip->obj_asof; |
| 1140 | localization = dip->obj_localization; /* for code consistency */ |
| 1141 | nlen = ncp->nc_nlen; |
| 1142 | flags = dip->flags & HAMMER_INODE_RO; |
| 1143 | ispfs = 0; |
| 1144 | hmp = dip->hmp; |
| 1145 | |
| 1146 | lwkt_gettoken(&hmp->fs_token); |
| 1147 | hammer_simple_transaction(&trans, hmp); |
| 1148 | |
| 1149 | for (i = 0; i < nlen; ++i) { |
| 1150 | if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { |
| 1151 | error = hammer_str_to_tid(ncp->nc_name + i + 2, |
| 1152 | &ispfs, &asof, &localization); |
| 1153 | if (error != 0) { |
| 1154 | i = nlen; |
| 1155 | break; |
| 1156 | } |
| 1157 | if (asof != HAMMER_MAX_TID) |
| 1158 | flags |= HAMMER_INODE_RO; |
| 1159 | break; |
| 1160 | } |
| 1161 | } |
| 1162 | nlen = i; |
| 1163 | |
| 1164 | /* |
| 1165 | * If this is a PFS we dive into the PFS root inode |
| 1166 | */ |
| 1167 | if (ispfs && nlen == 0) { |
| 1168 | ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, |
| 1169 | asof, localization, |
| 1170 | flags, &error); |
| 1171 | if (error == 0) { |
| 1172 | error = hammer_get_vnode(ip, &vp); |
| 1173 | hammer_rel_inode(ip, 0); |
| 1174 | } else { |
| 1175 | vp = NULL; |
| 1176 | } |
| 1177 | if (error == 0) { |
| 1178 | vn_unlock(vp); |
| 1179 | cache_setvp(ap->a_nch, vp); |
| 1180 | vrele(vp); |
| 1181 | } |
| 1182 | goto done; |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * If there is no path component the time extension is relative to dip. |
| 1187 | * e.g. "fubar/@@<snapshot>" |
| 1188 | * |
| 1189 | * "." is handled by the kernel, but ".@@<snapshot>" is not. |
| 1190 | * e.g. "fubar/.@@<snapshot>" |
| 1191 | * |
| 1192 | * ".." is handled by the kernel. We do not currently handle |
| 1193 | * "..@<snapshot>". |
| 1194 | */ |
| 1195 | if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { |
| 1196 | ip = hammer_get_inode(&trans, dip, dip->obj_id, |
| 1197 | asof, dip->obj_localization, |
| 1198 | flags, &error); |
| 1199 | if (error == 0) { |
| 1200 | error = hammer_get_vnode(ip, &vp); |
| 1201 | hammer_rel_inode(ip, 0); |
| 1202 | } else { |
| 1203 | vp = NULL; |
| 1204 | } |
| 1205 | if (error == 0) { |
| 1206 | vn_unlock(vp); |
| 1207 | cache_setvp(ap->a_nch, vp); |
| 1208 | vrele(vp); |
| 1209 | } |
| 1210 | goto done; |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * Calculate the namekey and setup the key range for the scan. This |
| 1215 | * works kinda like a chained hash table where the lower 32 bits |
| 1216 | * of the namekey synthesize the chain. |
| 1217 | * |
| 1218 | * The key range is inclusive of both key_beg and key_end. |
| 1219 | */ |
| 1220 | namekey = hammer_direntry_namekey(dip, ncp->nc_name, nlen, |
| 1221 | &max_iterations); |
| 1222 | |
| 1223 | error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); |
| 1224 | cursor.key_beg.localization = dip->obj_localization | |
| 1225 | hammer_dir_localization(dip); |
| 1226 | cursor.key_beg.obj_id = dip->obj_id; |
| 1227 | cursor.key_beg.key = namekey; |
| 1228 | cursor.key_beg.create_tid = 0; |
| 1229 | cursor.key_beg.delete_tid = 0; |
| 1230 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 1231 | cursor.key_beg.obj_type = 0; |
| 1232 | |
| 1233 | cursor.key_end = cursor.key_beg; |
| 1234 | cursor.key_end.key += max_iterations; |
| 1235 | cursor.asof = asof; |
| 1236 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 1237 | |
| 1238 | /* |
| 1239 | * Scan all matching records (the chain), locate the one matching |
| 1240 | * the requested path component. |
| 1241 | * |
| 1242 | * The hammer_ip_*() functions merge in-memory records with on-disk |
| 1243 | * records for the purposes of the search. |
| 1244 | */ |
| 1245 | obj_id = 0; |
| 1246 | localization = HAMMER_DEF_LOCALIZATION; |
| 1247 | |
| 1248 | if (error == 0) { |
| 1249 | error = hammer_ip_first(&cursor); |
| 1250 | while (error == 0) { |
| 1251 | error = hammer_ip_resolve_data(&cursor); |
| 1252 | if (error) |
| 1253 | break; |
| 1254 | if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && |
| 1255 | bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { |
| 1256 | obj_id = cursor.data->entry.obj_id; |
| 1257 | localization = cursor.data->entry.localization; |
| 1258 | break; |
| 1259 | } |
| 1260 | error = hammer_ip_next(&cursor); |
| 1261 | } |
| 1262 | } |
| 1263 | hammer_done_cursor(&cursor); |
| 1264 | |
| 1265 | /* |
| 1266 | * Lookup the obj_id. This should always succeed. If it does not |
| 1267 | * the filesystem may be damaged and we return a dummy inode. |
| 1268 | */ |
| 1269 | if (error == 0) { |
| 1270 | ip = hammer_get_inode(&trans, dip, obj_id, |
| 1271 | asof, localization, |
| 1272 | flags, &error); |
| 1273 | if (error == ENOENT) { |
| 1274 | hkprintf("WARNING: Missing inode for dirent \"%s\"\n" |
| 1275 | "\tobj_id = %016jx, asof=%016jx, lo=%08x\n", |
| 1276 | ncp->nc_name, |
| 1277 | (intmax_t)obj_id, (intmax_t)asof, |
| 1278 | localization); |
| 1279 | error = 0; |
| 1280 | ip = hammer_get_dummy_inode(&trans, dip, obj_id, |
| 1281 | asof, localization, |
| 1282 | flags, &error); |
| 1283 | } |
| 1284 | if (error == 0) { |
| 1285 | error = hammer_get_vnode(ip, &vp); |
| 1286 | hammer_rel_inode(ip, 0); |
| 1287 | } else { |
| 1288 | vp = NULL; |
| 1289 | } |
| 1290 | if (error == 0) { |
| 1291 | vn_unlock(vp); |
| 1292 | cache_setvp(ap->a_nch, vp); |
| 1293 | vrele(vp); |
| 1294 | } |
| 1295 | } else if (error == ENOENT) { |
| 1296 | cache_setvp(ap->a_nch, NULL); |
| 1297 | } |
| 1298 | done: |
| 1299 | hammer_done_transaction(&trans); |
| 1300 | lwkt_reltoken(&hmp->fs_token); |
| 1301 | return (error); |
| 1302 | } |
| 1303 | |
| 1304 | /* |
| 1305 | * hammer_vop_nlookupdotdot { dvp, vpp, cred } |
| 1306 | * |
| 1307 | * Locate the parent directory of a directory vnode. |
| 1308 | * |
| 1309 | * dvp is referenced but not locked. *vpp must be returned referenced and |
| 1310 | * locked. A parent_obj_id of 0 indicates that we are at the root. |
| 1311 | * |
| 1312 | * NOTE: as-of sequences are not linked into the directory structure. If |
| 1313 | * we are at the root with a different asof then the mount point, reload |
| 1314 | * the same directory with the mount point's asof. I'm not sure what this |
| 1315 | * will do to NFS. We encode ASOF stamps in NFS file handles so it might not |
| 1316 | * get confused, but it hasn't been tested. |
| 1317 | */ |
| 1318 | static |
| 1319 | int |
| 1320 | hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) |
| 1321 | { |
| 1322 | struct hammer_transaction trans; |
| 1323 | hammer_inode_t dip; |
| 1324 | hammer_inode_t ip; |
| 1325 | hammer_mount_t hmp; |
| 1326 | int64_t parent_obj_id; |
| 1327 | uint32_t parent_obj_localization; |
| 1328 | hammer_tid_t asof; |
| 1329 | int error; |
| 1330 | |
| 1331 | dip = VTOI(ap->a_dvp); |
| 1332 | asof = dip->obj_asof; |
| 1333 | hmp = dip->hmp; |
| 1334 | |
| 1335 | /* |
| 1336 | * Whos are parent? This could be the root of a pseudo-filesystem |
| 1337 | * whos parent is in another localization domain. |
| 1338 | */ |
| 1339 | lwkt_gettoken(&hmp->fs_token); |
| 1340 | parent_obj_id = dip->ino_data.parent_obj_id; |
| 1341 | if (dip->obj_id == HAMMER_OBJID_ROOT) |
| 1342 | parent_obj_localization = HAMMER_DEF_LOCALIZATION; |
| 1343 | else |
| 1344 | parent_obj_localization = dip->obj_localization; |
| 1345 | |
| 1346 | /* |
| 1347 | * It's probably a PFS root when dip->ino_data.parent_obj_id is 0. |
| 1348 | */ |
| 1349 | if (parent_obj_id == 0) { |
| 1350 | if (dip->obj_id == HAMMER_OBJID_ROOT && |
| 1351 | asof != hmp->asof) { |
| 1352 | parent_obj_id = dip->obj_id; |
| 1353 | asof = hmp->asof; |
| 1354 | *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); |
| 1355 | ksnprintf(*ap->a_fakename, 19, "0x%016jx", |
| 1356 | (intmax_t)dip->obj_asof); |
| 1357 | } else { |
| 1358 | *ap->a_vpp = NULL; |
| 1359 | lwkt_reltoken(&hmp->fs_token); |
| 1360 | return ENOENT; |
| 1361 | } |
| 1362 | } |
| 1363 | |
| 1364 | hammer_simple_transaction(&trans, hmp); |
| 1365 | |
| 1366 | ip = hammer_get_inode(&trans, dip, parent_obj_id, |
| 1367 | asof, parent_obj_localization, |
| 1368 | dip->flags, &error); |
| 1369 | if (ip) { |
| 1370 | error = hammer_get_vnode(ip, ap->a_vpp); |
| 1371 | hammer_rel_inode(ip, 0); |
| 1372 | } else { |
| 1373 | *ap->a_vpp = NULL; |
| 1374 | } |
| 1375 | hammer_done_transaction(&trans); |
| 1376 | lwkt_reltoken(&hmp->fs_token); |
| 1377 | return (error); |
| 1378 | } |
| 1379 | |
| 1380 | /* |
| 1381 | * hammer_vop_nlink { nch, dvp, vp, cred } |
| 1382 | */ |
| 1383 | static |
| 1384 | int |
| 1385 | hammer_vop_nlink(struct vop_nlink_args *ap) |
| 1386 | { |
| 1387 | struct hammer_transaction trans; |
| 1388 | hammer_inode_t dip; |
| 1389 | hammer_inode_t ip; |
| 1390 | struct nchandle *nch; |
| 1391 | hammer_mount_t hmp; |
| 1392 | int error; |
| 1393 | |
| 1394 | if (ap->a_dvp->v_mount != ap->a_vp->v_mount) |
| 1395 | return(EXDEV); |
| 1396 | |
| 1397 | nch = ap->a_nch; |
| 1398 | dip = VTOI(ap->a_dvp); |
| 1399 | ip = VTOI(ap->a_vp); |
| 1400 | hmp = dip->hmp; |
| 1401 | |
| 1402 | if (dip->obj_localization != ip->obj_localization) |
| 1403 | return(EXDEV); |
| 1404 | |
| 1405 | if (dip->flags & HAMMER_INODE_RO) |
| 1406 | return (EROFS); |
| 1407 | if (ip->flags & HAMMER_INODE_RO) |
| 1408 | return (EROFS); |
| 1409 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1410 | return (error); |
| 1411 | |
| 1412 | /* |
| 1413 | * Create a transaction to cover the operations we perform. |
| 1414 | */ |
| 1415 | lwkt_gettoken(&hmp->fs_token); |
| 1416 | hammer_start_transaction(&trans, hmp); |
| 1417 | |
| 1418 | /* |
| 1419 | * Add the filesystem object to the directory. Note that neither |
| 1420 | * dip nor ip are referenced or locked, but their vnodes are |
| 1421 | * referenced. This function will bump the inode's link count. |
| 1422 | */ |
| 1423 | error = hammer_ip_add_direntry(&trans, dip, |
| 1424 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1425 | ip); |
| 1426 | |
| 1427 | /* |
| 1428 | * Finish up. |
| 1429 | */ |
| 1430 | if (error == 0) { |
| 1431 | cache_setunresolved(nch); |
| 1432 | cache_setvp(nch, ap->a_vp); |
| 1433 | } |
| 1434 | hammer_done_transaction(&trans); |
| 1435 | hammer_knote(ap->a_vp, NOTE_LINK); |
| 1436 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 1437 | lwkt_reltoken(&hmp->fs_token); |
| 1438 | return (error); |
| 1439 | } |
| 1440 | |
| 1441 | /* |
| 1442 | * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } |
| 1443 | * |
| 1444 | * The operating system has already ensured that the directory entry |
| 1445 | * does not exist and done all appropriate namespace locking. |
| 1446 | */ |
| 1447 | static |
| 1448 | int |
| 1449 | hammer_vop_nmkdir(struct vop_nmkdir_args *ap) |
| 1450 | { |
| 1451 | struct hammer_transaction trans; |
| 1452 | hammer_inode_t dip; |
| 1453 | hammer_inode_t nip; |
| 1454 | struct nchandle *nch; |
| 1455 | hammer_mount_t hmp; |
| 1456 | int error; |
| 1457 | |
| 1458 | nch = ap->a_nch; |
| 1459 | dip = VTOI(ap->a_dvp); |
| 1460 | hmp = dip->hmp; |
| 1461 | |
| 1462 | if (dip->flags & HAMMER_INODE_RO) |
| 1463 | return (EROFS); |
| 1464 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1465 | return (error); |
| 1466 | |
| 1467 | /* |
| 1468 | * Create a transaction to cover the operations we perform. |
| 1469 | */ |
| 1470 | lwkt_gettoken(&hmp->fs_token); |
| 1471 | hammer_start_transaction(&trans, hmp); |
| 1472 | |
| 1473 | /* |
| 1474 | * Create a new filesystem object of the requested type. The |
| 1475 | * returned inode will be referenced but not locked. |
| 1476 | */ |
| 1477 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 1478 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1479 | NULL, &nip); |
| 1480 | if (error) { |
| 1481 | hammer_done_transaction(&trans); |
| 1482 | *ap->a_vpp = NULL; |
| 1483 | lwkt_reltoken(&hmp->fs_token); |
| 1484 | return (error); |
| 1485 | } |
| 1486 | /* |
| 1487 | * Add the new filesystem object to the directory. This will also |
| 1488 | * bump the inode's link count. |
| 1489 | */ |
| 1490 | error = hammer_ip_add_direntry(&trans, dip, |
| 1491 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1492 | nip); |
| 1493 | if (error) |
| 1494 | hkprintf("hammer_mkdir (add) error %d\n", error); |
| 1495 | |
| 1496 | /* |
| 1497 | * Finish up. |
| 1498 | */ |
| 1499 | if (error) { |
| 1500 | hammer_rel_inode(nip, 0); |
| 1501 | *ap->a_vpp = NULL; |
| 1502 | } else { |
| 1503 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 1504 | hammer_rel_inode(nip, 0); |
| 1505 | if (error == 0) { |
| 1506 | cache_setunresolved(ap->a_nch); |
| 1507 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 1508 | } |
| 1509 | } |
| 1510 | hammer_done_transaction(&trans); |
| 1511 | if (error == 0) |
| 1512 | hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); |
| 1513 | lwkt_reltoken(&hmp->fs_token); |
| 1514 | return (error); |
| 1515 | } |
| 1516 | |
| 1517 | /* |
| 1518 | * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } |
| 1519 | * |
| 1520 | * The operating system has already ensured that the directory entry |
| 1521 | * does not exist and done all appropriate namespace locking. |
| 1522 | */ |
| 1523 | static |
| 1524 | int |
| 1525 | hammer_vop_nmknod(struct vop_nmknod_args *ap) |
| 1526 | { |
| 1527 | struct hammer_transaction trans; |
| 1528 | hammer_inode_t dip; |
| 1529 | hammer_inode_t nip; |
| 1530 | struct nchandle *nch; |
| 1531 | hammer_mount_t hmp; |
| 1532 | int error; |
| 1533 | |
| 1534 | nch = ap->a_nch; |
| 1535 | dip = VTOI(ap->a_dvp); |
| 1536 | hmp = dip->hmp; |
| 1537 | |
| 1538 | if (dip->flags & HAMMER_INODE_RO) |
| 1539 | return (EROFS); |
| 1540 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1541 | return (error); |
| 1542 | |
| 1543 | /* |
| 1544 | * Create a transaction to cover the operations we perform. |
| 1545 | */ |
| 1546 | lwkt_gettoken(&hmp->fs_token); |
| 1547 | hammer_start_transaction(&trans, hmp); |
| 1548 | |
| 1549 | /* |
| 1550 | * Create a new filesystem object of the requested type. The |
| 1551 | * returned inode will be referenced but not locked. |
| 1552 | * |
| 1553 | * If mknod specifies a directory a pseudo-fs is created. |
| 1554 | */ |
| 1555 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 1556 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1557 | NULL, &nip); |
| 1558 | if (error) { |
| 1559 | hammer_done_transaction(&trans); |
| 1560 | *ap->a_vpp = NULL; |
| 1561 | lwkt_reltoken(&hmp->fs_token); |
| 1562 | return (error); |
| 1563 | } |
| 1564 | |
| 1565 | /* |
| 1566 | * Add the new filesystem object to the directory. This will also |
| 1567 | * bump the inode's link count. |
| 1568 | */ |
| 1569 | error = hammer_ip_add_direntry(&trans, dip, |
| 1570 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1571 | nip); |
| 1572 | |
| 1573 | /* |
| 1574 | * Finish up. |
| 1575 | */ |
| 1576 | if (error) { |
| 1577 | hammer_rel_inode(nip, 0); |
| 1578 | *ap->a_vpp = NULL; |
| 1579 | } else { |
| 1580 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 1581 | hammer_rel_inode(nip, 0); |
| 1582 | if (error == 0) { |
| 1583 | cache_setunresolved(ap->a_nch); |
| 1584 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 1585 | } |
| 1586 | } |
| 1587 | hammer_done_transaction(&trans); |
| 1588 | if (error == 0) |
| 1589 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 1590 | lwkt_reltoken(&hmp->fs_token); |
| 1591 | return (error); |
| 1592 | } |
| 1593 | |
| 1594 | /* |
| 1595 | * hammer_vop_open { vp, mode, cred, fp } |
| 1596 | * |
| 1597 | * MPSAFE (does not require fs_token) |
| 1598 | */ |
| 1599 | static |
| 1600 | int |
| 1601 | hammer_vop_open(struct vop_open_args *ap) |
| 1602 | { |
| 1603 | hammer_inode_t ip; |
| 1604 | |
| 1605 | ip = VTOI(ap->a_vp); |
| 1606 | |
| 1607 | if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) |
| 1608 | return (EROFS); |
| 1609 | return(vop_stdopen(ap)); |
| 1610 | } |
| 1611 | |
| 1612 | /* |
| 1613 | * hammer_vop_print { vp } |
| 1614 | */ |
| 1615 | static |
| 1616 | int |
| 1617 | hammer_vop_print(struct vop_print_args *ap) |
| 1618 | { |
| 1619 | return EOPNOTSUPP; |
| 1620 | } |
| 1621 | |
| 1622 | /* |
| 1623 | * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } |
| 1624 | */ |
| 1625 | static |
| 1626 | int |
| 1627 | hammer_vop_readdir(struct vop_readdir_args *ap) |
| 1628 | { |
| 1629 | struct hammer_transaction trans; |
| 1630 | struct hammer_cursor cursor; |
| 1631 | hammer_inode_t ip; |
| 1632 | hammer_mount_t hmp; |
| 1633 | struct uio *uio; |
| 1634 | hammer_base_elm_t base; |
| 1635 | int error; |
| 1636 | int cookie_index; |
| 1637 | int ncookies; |
| 1638 | off_t *cookies; |
| 1639 | off_t saveoff; |
| 1640 | int r; |
| 1641 | int dtype; |
| 1642 | |
| 1643 | ip = VTOI(ap->a_vp); |
| 1644 | uio = ap->a_uio; |
| 1645 | saveoff = uio->uio_offset; |
| 1646 | hmp = ip->hmp; |
| 1647 | |
| 1648 | if (ap->a_ncookies) { |
| 1649 | ncookies = uio->uio_resid / 16 + 1; |
| 1650 | if (ncookies > 1024) |
| 1651 | ncookies = 1024; |
| 1652 | cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); |
| 1653 | cookie_index = 0; |
| 1654 | } else { |
| 1655 | ncookies = -1; |
| 1656 | cookies = NULL; |
| 1657 | cookie_index = 0; |
| 1658 | } |
| 1659 | |
| 1660 | lwkt_gettoken(&hmp->fs_token); |
| 1661 | hammer_simple_transaction(&trans, hmp); |
| 1662 | |
| 1663 | /* |
| 1664 | * Handle artificial entries |
| 1665 | * |
| 1666 | * It should be noted that the minimum value for a directory |
| 1667 | * hash key on-media is 0x0000000100000000, so we can use anything |
| 1668 | * less then that to represent our 'special' key space. |
| 1669 | */ |
| 1670 | error = 0; |
| 1671 | if (saveoff == 0) { |
| 1672 | r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); |
| 1673 | if (r) |
| 1674 | goto done; |
| 1675 | if (cookies) |
| 1676 | cookies[cookie_index] = saveoff; |
| 1677 | ++saveoff; |
| 1678 | ++cookie_index; |
| 1679 | if (cookie_index == ncookies) |
| 1680 | goto done; |
| 1681 | } |
| 1682 | if (saveoff == 1) { |
| 1683 | if (ip->ino_data.parent_obj_id) { |
| 1684 | r = vop_write_dirent(&error, uio, |
| 1685 | ip->ino_data.parent_obj_id, |
| 1686 | DT_DIR, 2, ".."); |
| 1687 | } else { |
| 1688 | r = vop_write_dirent(&error, uio, |
| 1689 | ip->obj_id, DT_DIR, 2, ".."); |
| 1690 | } |
| 1691 | if (r) |
| 1692 | goto done; |
| 1693 | if (cookies) |
| 1694 | cookies[cookie_index] = saveoff; |
| 1695 | ++saveoff; |
| 1696 | ++cookie_index; |
| 1697 | if (cookie_index == ncookies) |
| 1698 | goto done; |
| 1699 | } |
| 1700 | |
| 1701 | /* |
| 1702 | * Key range (begin and end inclusive) to scan. Directory keys |
| 1703 | * directly translate to a 64 bit 'seek' position. |
| 1704 | */ |
| 1705 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 1706 | cursor.key_beg.localization = ip->obj_localization | |
| 1707 | hammer_dir_localization(ip); |
| 1708 | cursor.key_beg.obj_id = ip->obj_id; |
| 1709 | cursor.key_beg.create_tid = 0; |
| 1710 | cursor.key_beg.delete_tid = 0; |
| 1711 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 1712 | cursor.key_beg.obj_type = 0; |
| 1713 | cursor.key_beg.key = saveoff; |
| 1714 | |
| 1715 | cursor.key_end = cursor.key_beg; |
| 1716 | cursor.key_end.key = HAMMER_MAX_KEY; |
| 1717 | cursor.asof = ip->obj_asof; |
| 1718 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 1719 | |
| 1720 | error = hammer_ip_first(&cursor); |
| 1721 | |
| 1722 | while (error == 0) { |
| 1723 | error = hammer_ip_resolve_data(&cursor); |
| 1724 | if (error) |
| 1725 | break; |
| 1726 | base = &cursor.leaf->base; |
| 1727 | saveoff = base->key; |
| 1728 | KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); |
| 1729 | |
| 1730 | if (base->obj_id != ip->obj_id) |
| 1731 | hpanic("bad record at %p", cursor.node); |
| 1732 | |
| 1733 | dtype = hammer_get_dtype(cursor.leaf->base.obj_type); |
| 1734 | r = vop_write_dirent( |
| 1735 | &error, uio, cursor.data->entry.obj_id, |
| 1736 | dtype, |
| 1737 | cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , |
| 1738 | (void *)cursor.data->entry.name); |
| 1739 | if (r) |
| 1740 | break; |
| 1741 | ++saveoff; |
| 1742 | if (cookies) |
| 1743 | cookies[cookie_index] = base->key; |
| 1744 | ++cookie_index; |
| 1745 | if (cookie_index == ncookies) |
| 1746 | break; |
| 1747 | error = hammer_ip_next(&cursor); |
| 1748 | } |
| 1749 | hammer_done_cursor(&cursor); |
| 1750 | |
| 1751 | done: |
| 1752 | hammer_done_transaction(&trans); |
| 1753 | |
| 1754 | if (ap->a_eofflag) |
| 1755 | *ap->a_eofflag = (error == ENOENT); |
| 1756 | uio->uio_offset = saveoff; |
| 1757 | if (error && cookie_index == 0) { |
| 1758 | if (error == ENOENT) |
| 1759 | error = 0; |
| 1760 | if (cookies) { |
| 1761 | kfree(cookies, M_TEMP); |
| 1762 | *ap->a_ncookies = 0; |
| 1763 | *ap->a_cookies = NULL; |
| 1764 | } |
| 1765 | } else { |
| 1766 | if (error == ENOENT) |
| 1767 | error = 0; |
| 1768 | if (cookies) { |
| 1769 | *ap->a_ncookies = cookie_index; |
| 1770 | *ap->a_cookies = cookies; |
| 1771 | } |
| 1772 | } |
| 1773 | lwkt_reltoken(&hmp->fs_token); |
| 1774 | return(error); |
| 1775 | } |
| 1776 | |
| 1777 | /* |
| 1778 | * hammer_vop_readlink { vp, uio, cred } |
| 1779 | */ |
| 1780 | static |
| 1781 | int |
| 1782 | hammer_vop_readlink(struct vop_readlink_args *ap) |
| 1783 | { |
| 1784 | struct hammer_transaction trans; |
| 1785 | struct hammer_cursor cursor; |
| 1786 | hammer_inode_t ip; |
| 1787 | hammer_mount_t hmp; |
| 1788 | char buf[32]; |
| 1789 | uint32_t localization; |
| 1790 | hammer_pseudofs_inmem_t pfsm; |
| 1791 | int error; |
| 1792 | |
| 1793 | ip = VTOI(ap->a_vp); |
| 1794 | hmp = ip->hmp; |
| 1795 | |
| 1796 | lwkt_gettoken(&hmp->fs_token); |
| 1797 | |
| 1798 | /* |
| 1799 | * Shortcut if the symlink data was stuffed into ino_data. |
| 1800 | * |
| 1801 | * Also expand special "@@PFS%05d" softlinks (expansion only |
| 1802 | * occurs for non-historical (current) accesses made from the |
| 1803 | * primary filesystem). |
| 1804 | * |
| 1805 | * Note that userspace hammer command does not allow users to |
| 1806 | * create a @@PFS softlink under an existing other PFS (id!=0) |
| 1807 | * so the ip localization here for @@PFS softlink is always 0. |
| 1808 | */ |
| 1809 | if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { |
| 1810 | char *ptr; |
| 1811 | int bytes; |
| 1812 | |
| 1813 | ptr = ip->ino_data.ext.symlink; |
| 1814 | bytes = (int)ip->ino_data.size; |
| 1815 | if (bytes == 10 && |
| 1816 | ip->obj_asof == HAMMER_MAX_TID && |
| 1817 | ip->obj_localization == HAMMER_DEF_LOCALIZATION && |
| 1818 | strncmp(ptr, "@@PFS", 5) == 0) { |
| 1819 | hammer_simple_transaction(&trans, hmp); |
| 1820 | bcopy(ptr + 5, buf, 5); |
| 1821 | buf[5] = 0; |
| 1822 | localization = pfs_to_lo(strtoul(buf, NULL, 10)); |
| 1823 | pfsm = hammer_load_pseudofs(&trans, localization, |
| 1824 | &error); |
| 1825 | if (error == 0) { |
| 1826 | if (hammer_is_pfs_slave(&pfsm->pfsd)) { |
| 1827 | /* vap->va_size == 26 */ |
| 1828 | ksnprintf(buf, sizeof(buf), |
| 1829 | "@@0x%016jx:%05d", |
| 1830 | (intmax_t)pfsm->pfsd.sync_end_tid, |
| 1831 | lo_to_pfs(localization)); |
| 1832 | } else { |
| 1833 | /* vap->va_size == 10 */ |
| 1834 | ksnprintf(buf, sizeof(buf), |
| 1835 | "@@-1:%05d", |
| 1836 | lo_to_pfs(localization)); |
| 1837 | } |
| 1838 | ptr = buf; |
| 1839 | bytes = strlen(buf); |
| 1840 | } |
| 1841 | if (pfsm) |
| 1842 | hammer_rel_pseudofs(hmp, pfsm); |
| 1843 | hammer_done_transaction(&trans); |
| 1844 | } |
| 1845 | error = uiomove(ptr, bytes, ap->a_uio); |
| 1846 | lwkt_reltoken(&hmp->fs_token); |
| 1847 | return(error); |
| 1848 | } |
| 1849 | |
| 1850 | /* |
| 1851 | * Long version |
| 1852 | */ |
| 1853 | hammer_simple_transaction(&trans, hmp); |
| 1854 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 1855 | |
| 1856 | /* |
| 1857 | * Key range (begin and end inclusive) to scan. Directory keys |
| 1858 | * directly translate to a 64 bit 'seek' position. |
| 1859 | */ |
| 1860 | cursor.key_beg.localization = ip->obj_localization | |
| 1861 | HAMMER_LOCALIZE_MISC; |
| 1862 | cursor.key_beg.obj_id = ip->obj_id; |
| 1863 | cursor.key_beg.create_tid = 0; |
| 1864 | cursor.key_beg.delete_tid = 0; |
| 1865 | cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; |
| 1866 | cursor.key_beg.obj_type = 0; |
| 1867 | cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; |
| 1868 | cursor.asof = ip->obj_asof; |
| 1869 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 1870 | |
| 1871 | error = hammer_ip_lookup(&cursor); |
| 1872 | if (error == 0) { |
| 1873 | error = hammer_ip_resolve_data(&cursor); |
| 1874 | if (error == 0) { |
| 1875 | KKASSERT(cursor.leaf->data_len >= |
| 1876 | HAMMER_SYMLINK_NAME_OFF); |
| 1877 | error = uiomove(cursor.data->symlink.name, |
| 1878 | cursor.leaf->data_len - |
| 1879 | HAMMER_SYMLINK_NAME_OFF, |
| 1880 | ap->a_uio); |
| 1881 | } |
| 1882 | } |
| 1883 | hammer_done_cursor(&cursor); |
| 1884 | hammer_done_transaction(&trans); |
| 1885 | lwkt_reltoken(&hmp->fs_token); |
| 1886 | return(error); |
| 1887 | } |
| 1888 | |
| 1889 | /* |
| 1890 | * hammer_vop_nremove { nch, dvp, cred } |
| 1891 | */ |
| 1892 | static |
| 1893 | int |
| 1894 | hammer_vop_nremove(struct vop_nremove_args *ap) |
| 1895 | { |
| 1896 | struct hammer_transaction trans; |
| 1897 | hammer_inode_t dip; |
| 1898 | hammer_mount_t hmp; |
| 1899 | int error; |
| 1900 | |
| 1901 | dip = VTOI(ap->a_dvp); |
| 1902 | hmp = dip->hmp; |
| 1903 | |
| 1904 | if (hammer_nohistory(dip) == 0 && |
| 1905 | (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { |
| 1906 | return (error); |
| 1907 | } |
| 1908 | |
| 1909 | lwkt_gettoken(&hmp->fs_token); |
| 1910 | hammer_start_transaction(&trans, hmp); |
| 1911 | error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); |
| 1912 | hammer_done_transaction(&trans); |
| 1913 | if (error == 0) |
| 1914 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 1915 | lwkt_reltoken(&hmp->fs_token); |
| 1916 | return (error); |
| 1917 | } |
| 1918 | |
| 1919 | /* |
| 1920 | * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } |
| 1921 | */ |
| 1922 | static |
| 1923 | int |
| 1924 | hammer_vop_nrename(struct vop_nrename_args *ap) |
| 1925 | { |
| 1926 | struct hammer_transaction trans; |
| 1927 | struct namecache *fncp; |
| 1928 | struct namecache *tncp; |
| 1929 | hammer_inode_t fdip; |
| 1930 | hammer_inode_t tdip; |
| 1931 | hammer_inode_t ip; |
| 1932 | hammer_mount_t hmp; |
| 1933 | struct hammer_cursor cursor; |
| 1934 | int64_t namekey; |
| 1935 | uint32_t max_iterations; |
| 1936 | int nlen, error; |
| 1937 | |
| 1938 | if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) |
| 1939 | return(EXDEV); |
| 1940 | if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) |
| 1941 | return(EXDEV); |
| 1942 | |
| 1943 | fdip = VTOI(ap->a_fdvp); |
| 1944 | tdip = VTOI(ap->a_tdvp); |
| 1945 | fncp = ap->a_fnch->ncp; |
| 1946 | tncp = ap->a_tnch->ncp; |
| 1947 | ip = VTOI(fncp->nc_vp); |
| 1948 | KKASSERT(ip != NULL); |
| 1949 | |
| 1950 | hmp = ip->hmp; |
| 1951 | |
| 1952 | if (fdip->obj_localization != tdip->obj_localization) |
| 1953 | return(EXDEV); |
| 1954 | if (fdip->obj_localization != ip->obj_localization) |
| 1955 | return(EXDEV); |
| 1956 | |
| 1957 | if (fdip->flags & HAMMER_INODE_RO) |
| 1958 | return (EROFS); |
| 1959 | if (tdip->flags & HAMMER_INODE_RO) |
| 1960 | return (EROFS); |
| 1961 | if (ip->flags & HAMMER_INODE_RO) |
| 1962 | return (EROFS); |
| 1963 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1964 | return (error); |
| 1965 | |
| 1966 | lwkt_gettoken(&hmp->fs_token); |
| 1967 | hammer_start_transaction(&trans, hmp); |
| 1968 | |
| 1969 | /* |
| 1970 | * Remove tncp from the target directory and then link ip as |
| 1971 | * tncp. XXX pass trans to dounlink |
| 1972 | * |
| 1973 | * Force the inode sync-time to match the transaction so it is |
| 1974 | * in-sync with the creation of the target directory entry. |
| 1975 | */ |
| 1976 | error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, |
| 1977 | ap->a_cred, 0, -1); |
| 1978 | if (error == 0 || error == ENOENT) { |
| 1979 | error = hammer_ip_add_direntry(&trans, tdip, |
| 1980 | tncp->nc_name, tncp->nc_nlen, |
| 1981 | ip); |
| 1982 | if (error == 0) { |
| 1983 | ip->ino_data.parent_obj_id = tdip->obj_id; |
| 1984 | ip->ino_data.ctime = trans.time; |
| 1985 | hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); |
| 1986 | } |
| 1987 | } |
| 1988 | if (error) |
| 1989 | goto failed; /* XXX */ |
| 1990 | |
| 1991 | /* |
| 1992 | * Locate the record in the originating directory and remove it. |
| 1993 | * |
| 1994 | * Calculate the namekey and setup the key range for the scan. This |
| 1995 | * works kinda like a chained hash table where the lower 32 bits |
| 1996 | * of the namekey synthesize the chain. |
| 1997 | * |
| 1998 | * The key range is inclusive of both key_beg and key_end. |
| 1999 | */ |
| 2000 | namekey = hammer_direntry_namekey(fdip, fncp->nc_name, fncp->nc_nlen, |
| 2001 | &max_iterations); |
| 2002 | retry: |
| 2003 | hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); |
| 2004 | cursor.key_beg.localization = fdip->obj_localization | |
| 2005 | hammer_dir_localization(fdip); |
| 2006 | cursor.key_beg.obj_id = fdip->obj_id; |
| 2007 | cursor.key_beg.key = namekey; |
| 2008 | cursor.key_beg.create_tid = 0; |
| 2009 | cursor.key_beg.delete_tid = 0; |
| 2010 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 2011 | cursor.key_beg.obj_type = 0; |
| 2012 | |
| 2013 | cursor.key_end = cursor.key_beg; |
| 2014 | cursor.key_end.key += max_iterations; |
| 2015 | cursor.asof = fdip->obj_asof; |
| 2016 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 2017 | |
| 2018 | /* |
| 2019 | * Scan all matching records (the chain), locate the one matching |
| 2020 | * the requested path component. |
| 2021 | * |
| 2022 | * The hammer_ip_*() functions merge in-memory records with on-disk |
| 2023 | * records for the purposes of the search. |
| 2024 | */ |
| 2025 | error = hammer_ip_first(&cursor); |
| 2026 | while (error == 0) { |
| 2027 | if (hammer_ip_resolve_data(&cursor) != 0) |
| 2028 | break; |
| 2029 | nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; |
| 2030 | KKASSERT(nlen > 0); |
| 2031 | if (fncp->nc_nlen == nlen && |
| 2032 | bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { |
| 2033 | break; |
| 2034 | } |
| 2035 | error = hammer_ip_next(&cursor); |
| 2036 | } |
| 2037 | |
| 2038 | /* |
| 2039 | * If all is ok we have to get the inode so we can adjust nlinks. |
| 2040 | * |
| 2041 | * WARNING: hammer_ip_del_direntry() may have to terminate the |
| 2042 | * cursor to avoid a recursion. It's ok to call hammer_done_cursor() |
| 2043 | * twice. |
| 2044 | */ |
| 2045 | if (error == 0) |
| 2046 | error = hammer_ip_del_direntry(&trans, &cursor, fdip, ip); |
| 2047 | |
| 2048 | /* |
| 2049 | * XXX A deadlock here will break rename's atomicy for the purposes |
| 2050 | * of crash recovery. |
| 2051 | */ |
| 2052 | if (error == EDEADLK) { |
| 2053 | hammer_done_cursor(&cursor); |
| 2054 | goto retry; |
| 2055 | } |
| 2056 | |
| 2057 | /* |
| 2058 | * Cleanup and tell the kernel that the rename succeeded. |
| 2059 | * |
| 2060 | * NOTE: ip->vp, if non-NULL, cannot be directly referenced |
| 2061 | * without formally acquiring the vp since the vp might |
| 2062 | * have zero refs on it, or in the middle of a reclaim, |
| 2063 | * etc. |
| 2064 | */ |
| 2065 | hammer_done_cursor(&cursor); |
| 2066 | if (error == 0) { |
| 2067 | cache_rename(ap->a_fnch, ap->a_tnch); |
| 2068 | hammer_knote(ap->a_fdvp, NOTE_WRITE); |
| 2069 | hammer_knote(ap->a_tdvp, NOTE_WRITE); |
| 2070 | while (ip->vp) { |
| 2071 | struct vnode *vp; |
| 2072 | |
| 2073 | error = hammer_get_vnode(ip, &vp); |
| 2074 | if (error == 0 && vp) { |
| 2075 | vn_unlock(vp); |
| 2076 | hammer_knote(ip->vp, NOTE_RENAME); |
| 2077 | vrele(vp); |
| 2078 | break; |
| 2079 | } |
| 2080 | hdkprintf("ip/vp race2 avoided\n"); |
| 2081 | } |
| 2082 | } |
| 2083 | |
| 2084 | failed: |
| 2085 | hammer_done_transaction(&trans); |
| 2086 | lwkt_reltoken(&hmp->fs_token); |
| 2087 | return (error); |
| 2088 | } |
| 2089 | |
| 2090 | /* |
| 2091 | * hammer_vop_nrmdir { nch, dvp, cred } |
| 2092 | */ |
| 2093 | static |
| 2094 | int |
| 2095 | hammer_vop_nrmdir(struct vop_nrmdir_args *ap) |
| 2096 | { |
| 2097 | struct hammer_transaction trans; |
| 2098 | hammer_inode_t dip; |
| 2099 | hammer_mount_t hmp; |
| 2100 | int error; |
| 2101 | |
| 2102 | dip = VTOI(ap->a_dvp); |
| 2103 | hmp = dip->hmp; |
| 2104 | |
| 2105 | if (hammer_nohistory(dip) == 0 && |
| 2106 | (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { |
| 2107 | return (error); |
| 2108 | } |
| 2109 | |
| 2110 | lwkt_gettoken(&hmp->fs_token); |
| 2111 | hammer_start_transaction(&trans, hmp); |
| 2112 | error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); |
| 2113 | hammer_done_transaction(&trans); |
| 2114 | if (error == 0) |
| 2115 | hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); |
| 2116 | lwkt_reltoken(&hmp->fs_token); |
| 2117 | return (error); |
| 2118 | } |
| 2119 | |
| 2120 | /* |
| 2121 | * hammer_vop_markatime { vp, cred } |
| 2122 | */ |
| 2123 | static |
| 2124 | int |
| 2125 | hammer_vop_markatime(struct vop_markatime_args *ap) |
| 2126 | { |
| 2127 | struct hammer_transaction trans; |
| 2128 | hammer_inode_t ip; |
| 2129 | hammer_mount_t hmp; |
| 2130 | |
| 2131 | ip = VTOI(ap->a_vp); |
| 2132 | if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) |
| 2133 | return (EROFS); |
| 2134 | if (ip->flags & HAMMER_INODE_RO) |
| 2135 | return (EROFS); |
| 2136 | hmp = ip->hmp; |
| 2137 | if (hmp->mp->mnt_flag & MNT_NOATIME) |
| 2138 | return (0); |
| 2139 | lwkt_gettoken(&hmp->fs_token); |
| 2140 | hammer_start_transaction(&trans, hmp); |
| 2141 | |
| 2142 | ip->ino_data.atime = trans.time; |
| 2143 | hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); |
| 2144 | hammer_done_transaction(&trans); |
| 2145 | hammer_knote(ap->a_vp, NOTE_ATTRIB); |
| 2146 | lwkt_reltoken(&hmp->fs_token); |
| 2147 | return (0); |
| 2148 | } |
| 2149 | |
| 2150 | /* |
| 2151 | * hammer_vop_setattr { vp, vap, cred } |
| 2152 | */ |
| 2153 | static |
| 2154 | int |
| 2155 | hammer_vop_setattr(struct vop_setattr_args *ap) |
| 2156 | { |
| 2157 | struct hammer_transaction trans; |
| 2158 | hammer_inode_t ip; |
| 2159 | struct vattr *vap; |
| 2160 | hammer_mount_t hmp; |
| 2161 | int modflags; |
| 2162 | int error; |
| 2163 | int truncating; |
| 2164 | int blksize; |
| 2165 | int kflags; |
| 2166 | #if 0 |
| 2167 | int64_t aligned_size; |
| 2168 | #endif |
| 2169 | uint32_t flags; |
| 2170 | |
| 2171 | vap = ap->a_vap; |
| 2172 | ip = ap->a_vp->v_data; |
| 2173 | modflags = 0; |
| 2174 | kflags = 0; |
| 2175 | hmp = ip->hmp; |
| 2176 | |
| 2177 | if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) |
| 2178 | return(EROFS); |
| 2179 | if (ip->flags & HAMMER_INODE_RO) |
| 2180 | return (EROFS); |
| 2181 | if (hammer_nohistory(ip) == 0 && |
| 2182 | (error = hammer_checkspace(hmp, HAMMER_CHKSPC_REMOVE)) != 0) { |
| 2183 | return (error); |
| 2184 | } |
| 2185 | |
| 2186 | lwkt_gettoken(&hmp->fs_token); |
| 2187 | hammer_start_transaction(&trans, hmp); |
| 2188 | error = 0; |
| 2189 | |
| 2190 | if (vap->va_flags != VNOVAL) { |
| 2191 | flags = ip->ino_data.uflags; |
| 2192 | error = vop_helper_setattr_flags(&flags, vap->va_flags, |
| 2193 | hammer_to_unix_xid(&ip->ino_data.uid), |
| 2194 | ap->a_cred); |
| 2195 | if (error == 0) { |
| 2196 | if (ip->ino_data.uflags != flags) { |
| 2197 | ip->ino_data.uflags = flags; |
| 2198 | ip->ino_data.ctime = trans.time; |
| 2199 | modflags |= HAMMER_INODE_DDIRTY; |
| 2200 | kflags |= NOTE_ATTRIB; |
| 2201 | } |
| 2202 | if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { |
| 2203 | error = 0; |
| 2204 | goto done; |
| 2205 | } |
| 2206 | } |
| 2207 | goto done; |
| 2208 | } |
| 2209 | if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { |
| 2210 | error = EPERM; |
| 2211 | goto done; |
| 2212 | } |
| 2213 | if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { |
| 2214 | mode_t cur_mode = ip->ino_data.mode; |
| 2215 | uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 2216 | gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 2217 | hammer_uuid_t uuid_uid; |
| 2218 | hammer_uuid_t uuid_gid; |
| 2219 | |
| 2220 | error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, |
| 2221 | ap->a_cred, |
| 2222 | &cur_uid, &cur_gid, &cur_mode); |
| 2223 | if (error == 0) { |
| 2224 | hammer_guid_to_uuid(&uuid_uid, cur_uid); |
| 2225 | hammer_guid_to_uuid(&uuid_gid, cur_gid); |
| 2226 | if (kuuid_compare(&uuid_uid, &ip->ino_data.uid) || |
| 2227 | kuuid_compare(&uuid_gid, &ip->ino_data.gid) || |
| 2228 | ip->ino_data.mode != cur_mode) { |
| 2229 | ip->ino_data.uid = uuid_uid; |
| 2230 | ip->ino_data.gid = uuid_gid; |
| 2231 | ip->ino_data.mode = cur_mode; |
| 2232 | ip->ino_data.ctime = trans.time; |
| 2233 | modflags |= HAMMER_INODE_DDIRTY; |
| 2234 | } |
| 2235 | kflags |= NOTE_ATTRIB; |
| 2236 | } |
| 2237 | } |
| 2238 | while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { |
| 2239 | switch(ap->a_vp->v_type) { |
| 2240 | case VREG: |
| 2241 | if (vap->va_size == ip->ino_data.size) |
| 2242 | break; |
| 2243 | |
| 2244 | /* |
| 2245 | * Log the operation if in fast-fsync mode or if |
| 2246 | * there are unterminated redo write records present. |
| 2247 | * |
| 2248 | * The second check is needed so the recovery code |
| 2249 | * properly truncates write redos even if nominal |
| 2250 | * REDO operations is turned off due to excessive |
| 2251 | * writes, because the related records might be |
| 2252 | * destroyed and never lay down a TERM_WRITE. |
| 2253 | */ |
| 2254 | if ((ip->flags & HAMMER_INODE_REDO) || |
| 2255 | (ip->flags & HAMMER_INODE_RDIRTY)) { |
| 2256 | error = hammer_generate_redo(&trans, ip, |
| 2257 | vap->va_size, |
| 2258 | HAMMER_REDO_TRUNC, |
| 2259 | NULL, 0); |
| 2260 | } |
| 2261 | blksize = hammer_blocksize(vap->va_size); |
| 2262 | |
| 2263 | /* |
| 2264 | * XXX break atomicy, we can deadlock the backend |
| 2265 | * if we do not release the lock. Probably not a |
| 2266 | * big deal here. |
| 2267 | */ |
| 2268 | if (vap->va_size < ip->ino_data.size) { |
| 2269 | nvtruncbuf(ap->a_vp, vap->va_size, |
| 2270 | blksize, |
| 2271 | hammer_blockoff(vap->va_size), |
| 2272 | 0); |
| 2273 | truncating = 1; |
| 2274 | kflags |= NOTE_WRITE; |
| 2275 | } else { |
| 2276 | nvextendbuf(ap->a_vp, |
| 2277 | ip->ino_data.size, |
| 2278 | vap->va_size, |
| 2279 | hammer_blocksize(ip->ino_data.size), |
| 2280 | hammer_blocksize(vap->va_size), |
| 2281 | hammer_blockoff(ip->ino_data.size), |
| 2282 | hammer_blockoff(vap->va_size), |
| 2283 | 0); |
| 2284 | truncating = 0; |
| 2285 | kflags |= NOTE_WRITE | NOTE_EXTEND; |
| 2286 | } |
| 2287 | ip->ino_data.size = vap->va_size; |
| 2288 | ip->ino_data.mtime = trans.time; |
| 2289 | /* XXX safe to use SDIRTY instead of DDIRTY here? */ |
| 2290 | modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; |
| 2291 | vclrflags(ap->a_vp, VLASTWRITETS); |
| 2292 | |
| 2293 | /* |
| 2294 | * On-media truncation is cached in the inode until |
| 2295 | * the inode is synchronized. We must immediately |
| 2296 | * handle any frontend records. |
| 2297 | */ |
| 2298 | if (truncating) { |
| 2299 | hammer_ip_frontend_trunc(ip, vap->va_size); |
| 2300 | if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { |
| 2301 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 2302 | ip->trunc_off = vap->va_size; |
| 2303 | hammer_inode_dirty(ip); |
| 2304 | } else if (ip->trunc_off > vap->va_size) { |
| 2305 | ip->trunc_off = vap->va_size; |
| 2306 | } |
| 2307 | } |
| 2308 | |
| 2309 | #if 0 |
| 2310 | /* |
| 2311 | * When truncating, nvtruncbuf() may have cleaned out |
| 2312 | * a portion of the last block on-disk in the buffer |
| 2313 | * cache. We must clean out any frontend records |
| 2314 | * for blocks beyond the new last block. |
| 2315 | */ |
| 2316 | aligned_size = (vap->va_size + (blksize - 1)) & |
| 2317 | ~(int64_t)(blksize - 1); |
| 2318 | if (truncating && vap->va_size < aligned_size) { |
| 2319 | aligned_size -= blksize; |
| 2320 | hammer_ip_frontend_trunc(ip, aligned_size); |
| 2321 | } |
| 2322 | #endif |
| 2323 | break; |
| 2324 | case VDATABASE: |
| 2325 | if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { |
| 2326 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 2327 | ip->trunc_off = vap->va_size; |
| 2328 | hammer_inode_dirty(ip); |
| 2329 | } else if (ip->trunc_off > vap->va_size) { |
| 2330 | ip->trunc_off = vap->va_size; |
| 2331 | } |
| 2332 | hammer_ip_frontend_trunc(ip, vap->va_size); |
| 2333 | ip->ino_data.size = vap->va_size; |
| 2334 | ip->ino_data.mtime = trans.time; |
| 2335 | modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; |
| 2336 | vclrflags(ap->a_vp, VLASTWRITETS); |
| 2337 | kflags |= NOTE_ATTRIB; |
| 2338 | break; |
| 2339 | default: |
| 2340 | error = EINVAL; |
| 2341 | goto done; |
| 2342 | } |
| 2343 | break; |
| 2344 | } |
| 2345 | if (vap->va_atime.tv_sec != VNOVAL) { |
| 2346 | ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); |
| 2347 | modflags |= HAMMER_INODE_ATIME; |
| 2348 | kflags |= NOTE_ATTRIB; |
| 2349 | } |
| 2350 | if (vap->va_mtime.tv_sec != VNOVAL) { |
| 2351 | ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); |
| 2352 | modflags |= HAMMER_INODE_MTIME; |
| 2353 | kflags |= NOTE_ATTRIB; |
| 2354 | vclrflags(ap->a_vp, VLASTWRITETS); |
| 2355 | } |
| 2356 | if (vap->va_mode != (mode_t)VNOVAL) { |
| 2357 | mode_t cur_mode = ip->ino_data.mode; |
| 2358 | uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 2359 | gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 2360 | |
| 2361 | error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, |
| 2362 | cur_uid, cur_gid, &cur_mode); |
| 2363 | if (error == 0) { |
| 2364 | ip->ino_data.mode = cur_mode; |
| 2365 | ip->ino_data.ctime = trans.time; |
| 2366 | modflags |= HAMMER_INODE_DDIRTY; |
| 2367 | kflags |= NOTE_ATTRIB; |
| 2368 | } |
| 2369 | } |
| 2370 | done: |
| 2371 | if (error == 0) |
| 2372 | hammer_modify_inode(&trans, ip, modflags); |
| 2373 | hammer_done_transaction(&trans); |
| 2374 | hammer_knote(ap->a_vp, kflags); |
| 2375 | lwkt_reltoken(&hmp->fs_token); |
| 2376 | return (error); |
| 2377 | } |
| 2378 | |
| 2379 | /* |
| 2380 | * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } |
| 2381 | */ |
| 2382 | static |
| 2383 | int |
| 2384 | hammer_vop_nsymlink(struct vop_nsymlink_args *ap) |
| 2385 | { |
| 2386 | struct hammer_transaction trans; |
| 2387 | hammer_inode_t dip; |
| 2388 | hammer_inode_t nip; |
| 2389 | hammer_record_t record; |
| 2390 | struct nchandle *nch; |
| 2391 | hammer_mount_t hmp; |
| 2392 | int error; |
| 2393 | int bytes; |
| 2394 | |
| 2395 | ap->a_vap->va_type = VLNK; |
| 2396 | |
| 2397 | nch = ap->a_nch; |
| 2398 | dip = VTOI(ap->a_dvp); |
| 2399 | hmp = dip->hmp; |
| 2400 | |
| 2401 | if (dip->flags & HAMMER_INODE_RO) |
| 2402 | return (EROFS); |
| 2403 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 2404 | return (error); |
| 2405 | |
| 2406 | /* |
| 2407 | * Create a transaction to cover the operations we perform. |
| 2408 | */ |
| 2409 | lwkt_gettoken(&hmp->fs_token); |
| 2410 | hammer_start_transaction(&trans, hmp); |
| 2411 | |
| 2412 | /* |
| 2413 | * Create a new filesystem object of the requested type. The |
| 2414 | * returned inode will be referenced but not locked. |
| 2415 | */ |
| 2416 | |
| 2417 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 2418 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 2419 | NULL, &nip); |
| 2420 | if (error) { |
| 2421 | hammer_done_transaction(&trans); |
| 2422 | *ap->a_vpp = NULL; |
| 2423 | lwkt_reltoken(&hmp->fs_token); |
| 2424 | return (error); |
| 2425 | } |
| 2426 | |
| 2427 | /* |
| 2428 | * Add a record representing the symlink. symlink stores the link |
| 2429 | * as pure data, not a string, and is no \0 terminated. |
| 2430 | */ |
| 2431 | if (error == 0) { |
| 2432 | bytes = strlen(ap->a_target); |
| 2433 | |
| 2434 | if (bytes <= HAMMER_INODE_BASESYMLEN) { |
| 2435 | bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); |
| 2436 | } else { |
| 2437 | record = hammer_alloc_mem_record(nip, bytes); |
| 2438 | record->type = HAMMER_MEM_RECORD_GENERAL; |
| 2439 | |
| 2440 | record->leaf.base.localization = nip->obj_localization | |
| 2441 | HAMMER_LOCALIZE_MISC; |
| 2442 | record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; |
| 2443 | record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; |
| 2444 | record->leaf.data_len = bytes; |
| 2445 | KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); |
| 2446 | bcopy(ap->a_target, record->data->symlink.name, bytes); |
| 2447 | error = hammer_ip_add_record(&trans, record); |
| 2448 | } |
| 2449 | |
| 2450 | /* |
| 2451 | * Set the file size to the length of the link. |
| 2452 | */ |
| 2453 | if (error == 0) { |
| 2454 | nip->ino_data.size = bytes; |
| 2455 | hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); |
| 2456 | } |
| 2457 | } |
| 2458 | if (error == 0) |
| 2459 | error = hammer_ip_add_direntry(&trans, dip, nch->ncp->nc_name, |
| 2460 | nch->ncp->nc_nlen, nip); |
| 2461 | |
| 2462 | /* |
| 2463 | * Finish up. |
| 2464 | */ |
| 2465 | if (error) { |
| 2466 | hammer_rel_inode(nip, 0); |
| 2467 | *ap->a_vpp = NULL; |
| 2468 | } else { |
| 2469 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 2470 | hammer_rel_inode(nip, 0); |
| 2471 | if (error == 0) { |
| 2472 | cache_setunresolved(ap->a_nch); |
| 2473 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 2474 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 2475 | } |
| 2476 | } |
| 2477 | hammer_done_transaction(&trans); |
| 2478 | lwkt_reltoken(&hmp->fs_token); |
| 2479 | return (error); |
| 2480 | } |
| 2481 | |
| 2482 | /* |
| 2483 | * hammer_vop_nwhiteout { nch, dvp, cred, flags } |
| 2484 | */ |
| 2485 | static |
| 2486 | int |
| 2487 | hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) |
| 2488 | { |
| 2489 | struct hammer_transaction trans; |
| 2490 | hammer_inode_t dip; |
| 2491 | hammer_mount_t hmp; |
| 2492 | int error; |
| 2493 | |
| 2494 | dip = VTOI(ap->a_dvp); |
| 2495 | hmp = dip->hmp; |
| 2496 | |
| 2497 | if (hammer_nohistory(dip) == 0 && |
| 2498 | (error = hammer_checkspace(hmp, HAMMER_CHKSPC_CREATE)) != 0) { |
| 2499 | return (error); |
| 2500 | } |
| 2501 | |
| 2502 | lwkt_gettoken(&hmp->fs_token); |
| 2503 | hammer_start_transaction(&trans, hmp); |
| 2504 | error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, |
| 2505 | ap->a_cred, ap->a_flags, -1); |
| 2506 | hammer_done_transaction(&trans); |
| 2507 | lwkt_reltoken(&hmp->fs_token); |
| 2508 | |
| 2509 | return (error); |
| 2510 | } |
| 2511 | |
| 2512 | /* |
| 2513 | * hammer_vop_ioctl { vp, command, data, fflag, cred } |
| 2514 | */ |
| 2515 | static |
| 2516 | int |
| 2517 | hammer_vop_ioctl(struct vop_ioctl_args *ap) |
| 2518 | { |
| 2519 | hammer_inode_t ip = ap->a_vp->v_data; |
| 2520 | hammer_mount_t hmp = ip->hmp; |
| 2521 | int error; |
| 2522 | |
| 2523 | lwkt_gettoken(&hmp->fs_token); |
| 2524 | error = hammer_ioctl(ip, ap->a_command, ap->a_data, |
| 2525 | ap->a_fflag, ap->a_cred); |
| 2526 | lwkt_reltoken(&hmp->fs_token); |
| 2527 | return (error); |
| 2528 | } |
| 2529 | |
| 2530 | static |
| 2531 | int |
| 2532 | hammer_vop_mountctl(struct vop_mountctl_args *ap) |
| 2533 | { |
| 2534 | static const struct mountctl_opt extraopt[] = { |
| 2535 | { HMNT_NOHISTORY, "nohistory" }, |
| 2536 | { HMNT_MASTERID, "master" }, |
| 2537 | { HMNT_NOMIRROR, "nomirror" }, |
| 2538 | { 0, NULL} |
| 2539 | |
| 2540 | }; |
| 2541 | hammer_mount_t hmp; |
| 2542 | struct mount *mp; |
| 2543 | int usedbytes; |
| 2544 | int error; |
| 2545 | |
| 2546 | error = 0; |
| 2547 | usedbytes = 0; |
| 2548 | mp = ap->a_head.a_ops->head.vv_mount; |
| 2549 | KKASSERT(mp->mnt_data != NULL); |
| 2550 | hmp = (hammer_mount_t)mp->mnt_data; |
| 2551 | |
| 2552 | lwkt_gettoken(&hmp->fs_token); |
| 2553 | |
| 2554 | switch(ap->a_op) { |
| 2555 | case MOUNTCTL_SET_EXPORT: |
| 2556 | if (ap->a_ctllen != sizeof(struct export_args)) |
| 2557 | error = EINVAL; |
| 2558 | else |
| 2559 | error = hammer_vfs_export(mp, ap->a_op, |
| 2560 | (const struct export_args *)ap->a_ctl); |
| 2561 | break; |
| 2562 | case MOUNTCTL_MOUNTFLAGS: |
| 2563 | /* |
| 2564 | * Call standard mountctl VOP function |
| 2565 | * so we get user mount flags. |
| 2566 | */ |
| 2567 | error = vop_stdmountctl(ap); |
| 2568 | if (error) |
| 2569 | break; |
| 2570 | |
| 2571 | usedbytes = *ap->a_res; |
| 2572 | |
| 2573 | if (usedbytes > 0 && usedbytes < ap->a_buflen) { |
| 2574 | usedbytes += vfs_flagstostr(hmp->hflags, extraopt, |
| 2575 | ap->a_buf, |
| 2576 | ap->a_buflen - usedbytes, |
| 2577 | &error); |
| 2578 | } |
| 2579 | |
| 2580 | *ap->a_res += usedbytes; |
| 2581 | break; |
| 2582 | default: |
| 2583 | error = vop_stdmountctl(ap); |
| 2584 | break; |
| 2585 | } |
| 2586 | lwkt_reltoken(&hmp->fs_token); |
| 2587 | return(error); |
| 2588 | } |
| 2589 | |
| 2590 | /* |
| 2591 | * hammer_vop_strategy { vp, bio } |
| 2592 | * |
| 2593 | * Strategy call, used for regular file read & write only. Note that the |
| 2594 | * bp may represent a cluster. |
| 2595 | * |
| 2596 | * To simplify operation and allow better optimizations in the future, |
| 2597 | * this code does not make any assumptions with regards to buffer alignment |
| 2598 | * or size. |
| 2599 | */ |
| 2600 | static |
| 2601 | int |
| 2602 | hammer_vop_strategy(struct vop_strategy_args *ap) |
| 2603 | { |
| 2604 | struct buf *bp; |
| 2605 | int error; |
| 2606 | |
| 2607 | bp = ap->a_bio->bio_buf; |
| 2608 | |
| 2609 | switch(bp->b_cmd) { |
| 2610 | case BUF_CMD_READ: |
| 2611 | error = hammer_vop_strategy_read(ap); |
| 2612 | break; |
| 2613 | case BUF_CMD_WRITE: |
| 2614 | error = hammer_vop_strategy_write(ap); |
| 2615 | break; |
| 2616 | default: |
| 2617 | bp->b_error = error = EINVAL; |
| 2618 | bp->b_flags |= B_ERROR; |
| 2619 | biodone(ap->a_bio); |
| 2620 | break; |
| 2621 | } |
| 2622 | return (error); |
| 2623 | } |
| 2624 | |
| 2625 | /* |
| 2626 | * Read from a regular file. Iterate the related records and fill in the |
| 2627 | * BIO/BUF. Gaps are zero-filled. |
| 2628 | * |
| 2629 | * The support code in hammer_object.c should be used to deal with mixed |
| 2630 | * in-memory and on-disk records. |
| 2631 | * |
| 2632 | * NOTE: Can be called from the cluster code with an oversized buf. |
| 2633 | * |
| 2634 | * XXX atime update |
| 2635 | */ |
| 2636 | static |
| 2637 | int |
| 2638 | hammer_vop_strategy_read(struct vop_strategy_args *ap) |
| 2639 | { |
| 2640 | struct hammer_transaction trans; |
| 2641 | hammer_inode_t ip; |
| 2642 | hammer_inode_t dip; |
| 2643 | hammer_mount_t hmp; |
| 2644 | struct hammer_cursor cursor; |
| 2645 | hammer_base_elm_t base; |
| 2646 | hammer_off_t disk_offset; |
| 2647 | struct bio *bio; |
| 2648 | struct bio *nbio; |
| 2649 | struct buf *bp; |
| 2650 | int64_t rec_offset; |
| 2651 | int64_t ran_end; |
| 2652 | int64_t tmp64; |
| 2653 | int error; |
| 2654 | int boff; |
| 2655 | int roff; |
| 2656 | int n; |
| 2657 | int isdedupable; |
| 2658 | |
| 2659 | bio = ap->a_bio; |
| 2660 | bp = bio->bio_buf; |
| 2661 | ip = ap->a_vp->v_data; |
| 2662 | hmp = ip->hmp; |
| 2663 | |
| 2664 | /* |
| 2665 | * The zone-2 disk offset may have been set by the cluster code via |
| 2666 | * a BMAP operation, or else should be NOOFFSET. |
| 2667 | * |
| 2668 | * Checking the high bits for a match against zone-2 should suffice. |
| 2669 | * |
| 2670 | * In cases where a lot of data duplication is present it may be |
| 2671 | * more beneficial to drop through and doubule-buffer through the |
| 2672 | * device. |
| 2673 | */ |
| 2674 | nbio = push_bio(bio); |
| 2675 | if (hammer_is_zone_large_data(nbio->bio_offset)) { |
| 2676 | if (hammer_double_buffer == 0) { |
| 2677 | lwkt_gettoken(&hmp->fs_token); |
| 2678 | error = hammer_io_direct_read(hmp, nbio, NULL); |
| 2679 | lwkt_reltoken(&hmp->fs_token); |
| 2680 | return (error); |
| 2681 | } |
| 2682 | |
| 2683 | /* |
| 2684 | * Try to shortcut requests for double_buffer mode too. |
| 2685 | * Since this mode runs through the device buffer cache |
| 2686 | * only compatible buffer sizes (meaning those generated |
| 2687 | * by normal filesystem buffers) are legal. |
| 2688 | */ |
| 2689 | if ((bp->b_flags & B_PAGING) == 0) { |
| 2690 | lwkt_gettoken(&hmp->fs_token); |
| 2691 | error = hammer_io_indirect_read(hmp, nbio, NULL); |
| 2692 | lwkt_reltoken(&hmp->fs_token); |
| 2693 | return (error); |
| 2694 | } |
| 2695 | } |
| 2696 | |
| 2697 | /* |
| 2698 | * Well, that sucked. Do it the hard way. If all the stars are |
| 2699 | * aligned we may still be able to issue a direct-read. |
| 2700 | */ |
| 2701 | lwkt_gettoken(&hmp->fs_token); |
| 2702 | hammer_simple_transaction(&trans, hmp); |
| 2703 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 2704 | |
| 2705 | /* |
| 2706 | * Key range (begin and end inclusive) to scan. Note that the key's |
| 2707 | * stored in the actual records represent BASE+LEN, not BASE. The |
| 2708 | * first record containing bio_offset will have a key > bio_offset. |
| 2709 | */ |
| 2710 | cursor.key_beg.localization = ip->obj_localization | |
| 2711 | HAMMER_LOCALIZE_MISC; |
| 2712 | cursor.key_beg.obj_id = ip->obj_id; |
| 2713 | cursor.key_beg.create_tid = 0; |
| 2714 | cursor.key_beg.delete_tid = 0; |
| 2715 | cursor.key_beg.obj_type = 0; |
| 2716 | cursor.key_beg.key = bio->bio_offset + 1; |
| 2717 | cursor.asof = ip->obj_asof; |
| 2718 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 2719 | |
| 2720 | cursor.key_end = cursor.key_beg; |
| 2721 | KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); |
| 2722 | #if 0 |
| 2723 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { |
| 2724 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; |
| 2725 | cursor.key_end.rec_type = HAMMER_RECTYPE_DB; |
| 2726 | cursor.key_end.key = HAMMER_MAX_KEY; |
| 2727 | } else |
| 2728 | #endif |
| 2729 | { |
| 2730 | ran_end = bio->bio_offset + bp->b_bufsize; |
| 2731 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; |
| 2732 | cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; |
| 2733 | tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ |
| 2734 | if (tmp64 < ran_end) |
| 2735 | cursor.key_end.key = HAMMER_MAX_KEY; |
| 2736 | else |
| 2737 | cursor.key_end.key = ran_end + MAXPHYS + 1; |
| 2738 | } |
| 2739 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; |
| 2740 | |
| 2741 | /* |
| 2742 | * Set NOSWAPCACHE for cursor data extraction if double buffering |
| 2743 | * is disabled or (if the file is not marked cacheable via chflags |
| 2744 | * and vm.swapcache_use_chflags is enabled). |
| 2745 | */ |
| 2746 | if (hammer_double_buffer == 0 || |
| 2747 | ((ap->a_vp->v_flag & VSWAPCACHE) == 0 && |
| 2748 | vm_swapcache_use_chflags)) { |
| 2749 | cursor.flags |= HAMMER_CURSOR_NOSWAPCACHE; |
| 2750 | } |
| 2751 | |
| 2752 | error = hammer_ip_first(&cursor); |
| 2753 | boff = 0; |
| 2754 | |
| 2755 | while (error == 0) { |
| 2756 | /* |
| 2757 | * Get the base file offset of the record. The key for |
| 2758 | * data records is (base + bytes) rather then (base). |
| 2759 | */ |
| 2760 | base = &cursor.leaf->base; |
| 2761 | rec_offset = base->key - cursor.leaf->data_len; |
| 2762 | |
| 2763 | /* |
| 2764 | * Calculate the gap, if any, and zero-fill it. |
| 2765 | * |
| 2766 | * n is the offset of the start of the record verses our |
| 2767 | * current seek offset in the bio. |
| 2768 | */ |
| 2769 | n = (int)(rec_offset - (bio->bio_offset + boff)); |
| 2770 | if (n > 0) { |
| 2771 | if (n > bp->b_bufsize - boff) |
| 2772 | n = bp->b_bufsize - boff; |
| 2773 | bzero((char *)bp->b_data + boff, n); |
| 2774 | boff += n; |
| 2775 | n = 0; |
| 2776 | } |
| 2777 | |
| 2778 | /* |
| 2779 | * Calculate the data offset in the record and the number |
| 2780 | * of bytes we can copy. |
| 2781 | * |
| 2782 | * There are two degenerate cases. First, boff may already |
| 2783 | * be at bp->b_bufsize. Secondly, the data offset within |
| 2784 | * the record may exceed the record's size. |
| 2785 | */ |
| 2786 | roff = -n; |
| 2787 | rec_offset += roff; |
| 2788 | n = cursor.leaf->data_len - roff; |
| 2789 | if (n <= 0) { |
| 2790 | hdkprintf("bad n=%d roff=%d\n", n, roff); |
| 2791 | n = 0; |
| 2792 | } else if (n > bp->b_bufsize - boff) { |
| 2793 | n = bp->b_bufsize - boff; |
| 2794 | } |
| 2795 | |
| 2796 | /* |
| 2797 | * Deal with cached truncations. This cool bit of code |
| 2798 | * allows truncate()/ftruncate() to avoid having to sync |
| 2799 | * the file. |
| 2800 | * |
| 2801 | * If the frontend is truncated then all backend records are |
| 2802 | * subject to the frontend's truncation. |
| 2803 | * |
| 2804 | * If the backend is truncated then backend records on-disk |
| 2805 | * (but not in-memory) are subject to the backend's |
| 2806 | * truncation. In-memory records owned by the backend |
| 2807 | * represent data written after the truncation point on the |
| 2808 | * backend and must not be truncated. |
| 2809 | * |
| 2810 | * Truncate operations deal with frontend buffer cache |
| 2811 | * buffers and frontend-owned in-memory records synchronously. |
| 2812 | */ |
| 2813 | if (ip->flags & HAMMER_INODE_TRUNCATED) { |
| 2814 | if (hammer_cursor_ondisk(&cursor)/* || |
| 2815 | cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { |
| 2816 | if (ip->trunc_off <= rec_offset) |
| 2817 | n = 0; |
| 2818 | else if (ip->trunc_off < rec_offset + n) |
| 2819 | n = (int)(ip->trunc_off - rec_offset); |
| 2820 | } |
| 2821 | } |
| 2822 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 2823 | if (hammer_cursor_ondisk(&cursor)) { |
| 2824 | if (ip->sync_trunc_off <= rec_offset) |
| 2825 | n = 0; |
| 2826 | else if (ip->sync_trunc_off < rec_offset + n) |
| 2827 | n = (int)(ip->sync_trunc_off - rec_offset); |
| 2828 | } |
| 2829 | } |
| 2830 | |
| 2831 | /* |
| 2832 | * Try to issue a direct read into our bio if possible, |
| 2833 | * otherwise resolve the element data into a hammer_buffer |
| 2834 | * and copy. |
| 2835 | * |
| 2836 | * The buffer on-disk should be zerod past any real |
| 2837 | * truncation point, but may not be for any synthesized |
| 2838 | * truncation point from above. |
| 2839 | * |
| 2840 | * NOTE: disk_offset is only valid if the cursor data is |
| 2841 | * on-disk. |
| 2842 | */ |
| 2843 | disk_offset = cursor.leaf->data_offset + roff; |
| 2844 | isdedupable = (boff == 0 && n == bp->b_bufsize && |
| 2845 | hammer_cursor_ondisk(&cursor) && |
| 2846 | ((int)disk_offset & HAMMER_BUFMASK) == 0); |
| 2847 | |
| 2848 | if (isdedupable && hammer_double_buffer == 0) { |
| 2849 | /* |
| 2850 | * Direct read case |
| 2851 | */ |
| 2852 | KKASSERT(hammer_is_zone_large_data(disk_offset)); |
| 2853 | nbio->bio_offset = disk_offset; |
| 2854 | error = hammer_io_direct_read(hmp, nbio, cursor.leaf); |
| 2855 | goto done; |
| 2856 | } else if (isdedupable) { |
| 2857 | /* |
| 2858 | * Async I/O case for reading from backing store |
| 2859 | * and copying the data to the filesystem buffer. |
| 2860 | */ |
| 2861 | KKASSERT(hammer_is_zone_large_data(disk_offset)); |
| 2862 | nbio->bio_offset = disk_offset; |
| 2863 | error = hammer_io_indirect_read(hmp, nbio, cursor.leaf); |
| 2864 | goto done; |
| 2865 | } else if (n) { |
| 2866 | error = hammer_ip_resolve_data(&cursor); |
| 2867 | if (error == 0) { |
| 2868 | bcopy((char *)cursor.data + roff, |
| 2869 | (char *)bp->b_data + boff, n); |
| 2870 | } |
| 2871 | } |
| 2872 | if (error) |
| 2873 | break; |
| 2874 | |
| 2875 | /* |
| 2876 | * Iterate until we have filled the request. |
| 2877 | */ |
| 2878 | boff += n; |
| 2879 | if (boff == bp->b_bufsize) |
| 2880 | break; |
| 2881 | error = hammer_ip_next(&cursor); |
| 2882 | } |
| 2883 | |
| 2884 | /* |
| 2885 | * There may have been a gap after the last record |
| 2886 | */ |
| 2887 | if (error == ENOENT) |
| 2888 | error = 0; |
| 2889 | if (error == 0 && boff != bp->b_bufsize) { |
| 2890 | KKASSERT(boff < bp->b_bufsize); |
| 2891 | bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); |
| 2892 | /* boff = bp->b_bufsize; */ |
| 2893 | } |
| 2894 | |
| 2895 | /* |
| 2896 | * Disallow swapcache operation on the vnode buffer if double |
| 2897 | * buffering is enabled, the swapcache will get the data via |
| 2898 | * the block device buffer. |
| 2899 | */ |
| 2900 | if (hammer_double_buffer) |
| 2901 | bp->b_flags |= B_NOTMETA; |
| 2902 | |
| 2903 | /* |
| 2904 | * Cleanup |
| 2905 | */ |
| 2906 | bp->b_resid = 0; |
| 2907 | bp->b_error = error; |
| 2908 | if (error) |
| 2909 | bp->b_flags |= B_ERROR; |
| 2910 | biodone(ap->a_bio); |
| 2911 | |
| 2912 | done: |
| 2913 | /* |
| 2914 | * Cache the b-tree node for the last data read in cache[1]. |
| 2915 | * |
| 2916 | * If we hit the file EOF then also cache the node in the |
| 2917 | * governing directory's cache[3], it will be used to initialize |
| 2918 | * the new inode's cache[1] for any inodes looked up via the directory. |
| 2919 | * |
| 2920 | * This doesn't reduce disk accesses since the B-Tree chain is |
| 2921 | * likely cached, but it does reduce cpu overhead when looking |
| 2922 | * up file offsets for cpdup/tar/cpio style iterations. |
| 2923 | */ |
| 2924 | if (cursor.node) |
| 2925 | hammer_cache_node(&ip->cache[1], cursor.node); |
| 2926 | if (ran_end >= ip->ino_data.size) { |
| 2927 | dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, |
| 2928 | ip->obj_asof, ip->obj_localization); |
| 2929 | if (dip) { |
| 2930 | hammer_cache_node(&dip->cache[3], cursor.node); |
| 2931 | hammer_rel_inode(dip, 0); |
| 2932 | } |
| 2933 | } |
| 2934 | hammer_done_cursor(&cursor); |
| 2935 | hammer_done_transaction(&trans); |
| 2936 | lwkt_reltoken(&hmp->fs_token); |
| 2937 | return(error); |
| 2938 | } |
| 2939 | |
| 2940 | /* |
| 2941 | * BMAP operation - used to support cluster_read() only. |
| 2942 | * |
| 2943 | * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) |
| 2944 | * |
| 2945 | * This routine may return EOPNOTSUPP if the opration is not supported for |
| 2946 | * the specified offset. The contents of the pointer arguments do not |
| 2947 | * need to be initialized in that case. |
| 2948 | * |
| 2949 | * If a disk address is available and properly aligned return 0 with |
| 2950 | * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately |
| 2951 | * to the run-length relative to that offset. Callers may assume that |
| 2952 | * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently |
| 2953 | * large, so return EOPNOTSUPP if it is not sufficiently large. |
| 2954 | */ |
| 2955 | static |
| 2956 | int |
| 2957 | hammer_vop_bmap(struct vop_bmap_args *ap) |
| 2958 | { |
| 2959 | struct hammer_transaction trans; |
| 2960 | hammer_inode_t ip; |
| 2961 | hammer_mount_t hmp; |
| 2962 | struct hammer_cursor cursor; |
| 2963 | hammer_base_elm_t base; |
| 2964 | int64_t rec_offset; |
| 2965 | int64_t ran_end; |
| 2966 | int64_t tmp64; |
| 2967 | int64_t base_offset; |
| 2968 | int64_t base_disk_offset; |
| 2969 | int64_t last_offset; |
| 2970 | hammer_off_t last_disk_offset; |
| 2971 | hammer_off_t disk_offset; |
| 2972 | int rec_len; |
| 2973 | int error; |
| 2974 | int blksize; |
| 2975 | |
| 2976 | ip = ap->a_vp->v_data; |
| 2977 | hmp = ip->hmp; |
| 2978 | |
| 2979 | /* |
| 2980 | * We can only BMAP regular files. We can't BMAP database files, |
| 2981 | * directories, etc. |
| 2982 | */ |
| 2983 | if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) |
| 2984 | return(EOPNOTSUPP); |
| 2985 | |
| 2986 | /* |
| 2987 | * bmap is typically called with runp/runb both NULL when used |
| 2988 | * for writing. We do not support BMAP for writing atm. |
| 2989 | */ |
| 2990 | if (ap->a_cmd != BUF_CMD_READ) |
| 2991 | return(EOPNOTSUPP); |
| 2992 | |
| 2993 | /* |
| 2994 | * Scan the B-Tree to acquire blockmap addresses, then translate |
| 2995 | * to raw addresses. |
| 2996 | */ |
| 2997 | lwkt_gettoken(&hmp->fs_token); |
| 2998 | hammer_simple_transaction(&trans, hmp); |
| 2999 | |
| 3000 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 3001 | |
| 3002 | /* |
| 3003 | * Key range (begin and end inclusive) to scan. Note that the key's |
| 3004 | * stored in the actual records represent BASE+LEN, not BASE. The |
| 3005 | * first record containing bio_offset will have a key > bio_offset. |
| 3006 | */ |
| 3007 | cursor.key_beg.localization = ip->obj_localization | |
| 3008 | HAMMER_LOCALIZE_MISC; |
| 3009 | cursor.key_beg.obj_id = ip->obj_id; |
| 3010 | cursor.key_beg.create_tid = 0; |
| 3011 | cursor.key_beg.delete_tid = 0; |
| 3012 | cursor.key_beg.obj_type = 0; |
| 3013 | if (ap->a_runb) |
| 3014 | cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; |
| 3015 | else |
| 3016 | cursor.key_beg.key = ap->a_loffset + 1; |
| 3017 | if (cursor.key_beg.key < 0) |
| 3018 | cursor.key_beg.key = 0; |
| 3019 | cursor.asof = ip->obj_asof; |
| 3020 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 3021 | |
| 3022 | cursor.key_end = cursor.key_beg; |
| 3023 | KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); |
| 3024 | |
| 3025 | ran_end = ap->a_loffset + MAXPHYS; |
| 3026 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; |
| 3027 | cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; |
| 3028 | tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ |
| 3029 | if (tmp64 < ran_end) |
| 3030 | cursor.key_end.key = HAMMER_MAX_KEY; |
| 3031 | else |
| 3032 | cursor.key_end.key = ran_end + MAXPHYS + 1; |
| 3033 | |
| 3034 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; |
| 3035 | |
| 3036 | error = hammer_ip_first(&cursor); |
| 3037 | base_offset = last_offset = 0; |
| 3038 | base_disk_offset = last_disk_offset = 0; |
| 3039 | |
| 3040 | while (error == 0) { |
| 3041 | /* |
| 3042 | * Get the base file offset of the record. The key for |
| 3043 | * data records is (base + bytes) rather then (base). |
| 3044 | * |
| 3045 | * NOTE: rec_offset + rec_len may exceed the end-of-file. |
| 3046 | * The extra bytes should be zero on-disk and the BMAP op |
| 3047 | * should still be ok. |
| 3048 | */ |
| 3049 | base = &cursor.leaf->base; |
| 3050 | rec_offset = base->key - cursor.leaf->data_len; |
| 3051 | rec_len = cursor.leaf->data_len; |
| 3052 | |
| 3053 | /* |
| 3054 | * Incorporate any cached truncation. |
| 3055 | * |
| 3056 | * NOTE: Modifications to rec_len based on synthesized |
| 3057 | * truncation points remove the guarantee that any extended |
| 3058 | * data on disk is zero (since the truncations may not have |
| 3059 | * taken place on-media yet). |
| 3060 | */ |
| 3061 | if (ip->flags & HAMMER_INODE_TRUNCATED) { |
| 3062 | if (hammer_cursor_ondisk(&cursor) || |
| 3063 | cursor.iprec->flush_state == HAMMER_FST_FLUSH) { |
| 3064 | if (ip->trunc_off <= rec_offset) |
| 3065 | rec_len = 0; |
| 3066 | else if (ip->trunc_off < rec_offset + rec_len) |
| 3067 | rec_len = (int)(ip->trunc_off - rec_offset); |
| 3068 | } |
| 3069 | } |
| 3070 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 3071 | if (hammer_cursor_ondisk(&cursor)) { |
| 3072 | if (ip->sync_trunc_off <= rec_offset) |
| 3073 | rec_len = 0; |
| 3074 | else if (ip->sync_trunc_off < rec_offset + rec_len) |
| 3075 | rec_len = (int)(ip->sync_trunc_off - rec_offset); |
| 3076 | } |
| 3077 | } |
| 3078 | |
| 3079 | /* |
| 3080 | * Accumulate information. If we have hit a discontiguous |
| 3081 | * block reset base_offset unless we are already beyond the |
| 3082 | * requested offset. If we are, that's it, we stop. |
| 3083 | */ |
| 3084 | if (error) |
| 3085 | break; |
| 3086 | if (hammer_cursor_ondisk(&cursor)) { |
| 3087 | disk_offset = cursor.leaf->data_offset; |
| 3088 | if (rec_offset != last_offset || |
| 3089 | disk_offset != last_disk_offset) { |
| 3090 | if (rec_offset > ap->a_loffset) |
| 3091 | break; |
| 3092 | base_offset = rec_offset; |
| 3093 | base_disk_offset = disk_offset; |
| 3094 | } |
| 3095 | last_offset = rec_offset + rec_len; |
| 3096 | last_disk_offset = disk_offset + rec_len; |
| 3097 | } |
| 3098 | error = hammer_ip_next(&cursor); |
| 3099 | } |
| 3100 | |
| 3101 | if (cursor.node) |
| 3102 | hammer_cache_node(&ip->cache[1], cursor.node); |
| 3103 | |
| 3104 | hammer_done_cursor(&cursor); |
| 3105 | hammer_done_transaction(&trans); |
| 3106 | lwkt_reltoken(&hmp->fs_token); |
| 3107 | |
| 3108 | /* |
| 3109 | * If we couldn't find any records or the records we did find were |
| 3110 | * all behind the requested offset, return failure. A forward |
| 3111 | * truncation can leave a hole w/ no on-disk records. |
| 3112 | */ |
| 3113 | if (last_offset == 0 || last_offset < ap->a_loffset) |
| 3114 | return (EOPNOTSUPP); |
| 3115 | |
| 3116 | /* |
| 3117 | * Figure out the block size at the requested offset and adjust |
| 3118 | * our limits so the cluster_read() does not create inappropriately |
| 3119 | * sized buffer cache buffers. |
| 3120 | */ |
| 3121 | blksize = hammer_blocksize(ap->a_loffset); |
| 3122 | if (hammer_blocksize(base_offset) != blksize) { |
| 3123 | base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); |
| 3124 | } |
| 3125 | if (last_offset != ap->a_loffset && |
| 3126 | hammer_blocksize(last_offset - 1) != blksize) { |
| 3127 | last_offset = hammer_blockdemarc(ap->a_loffset, |
| 3128 | last_offset - 1); |
| 3129 | } |
| 3130 | |
| 3131 | /* |
| 3132 | * Returning EOPNOTSUPP simply prevents the direct-IO optimization |
| 3133 | * from occuring. |
| 3134 | */ |
| 3135 | disk_offset = base_disk_offset + (ap->a_loffset - base_offset); |
| 3136 | |
| 3137 | if (!hammer_is_zone_large_data(disk_offset)) { |
| 3138 | /* |
| 3139 | * Only large-data zones can be direct-IOd |
| 3140 | */ |
| 3141 | error = EOPNOTSUPP; |
| 3142 | } else if ((disk_offset & HAMMER_BUFMASK) || |
| 3143 | (last_offset - ap->a_loffset) < blksize) { |
| 3144 | /* |
| 3145 | * doffsetp is not aligned or the forward run size does |
| 3146 | * not cover a whole buffer, disallow the direct I/O. |
| 3147 | */ |
| 3148 | error = EOPNOTSUPP; |
| 3149 | } else { |
| 3150 | /* |
| 3151 | * We're good. |
| 3152 | */ |
| 3153 | *ap->a_doffsetp = disk_offset; |
| 3154 | if (ap->a_runb) { |
| 3155 | *ap->a_runb = ap->a_loffset - base_offset; |
| 3156 | KKASSERT(*ap->a_runb >= 0); |
| 3157 | } |
| 3158 | if (ap->a_runp) { |
| 3159 | *ap->a_runp = last_offset - ap->a_loffset; |
| 3160 | KKASSERT(*ap->a_runp >= 0); |
| 3161 | } |
| 3162 | error = 0; |
| 3163 | } |
| 3164 | return(error); |
| 3165 | } |
| 3166 | |
| 3167 | /* |
| 3168 | * Write to a regular file. Because this is a strategy call the OS is |
| 3169 | * trying to actually get data onto the media. |
| 3170 | */ |
| 3171 | static |
| 3172 | int |
| 3173 | hammer_vop_strategy_write(struct vop_strategy_args *ap) |
| 3174 | { |
| 3175 | hammer_record_t record; |
| 3176 | hammer_mount_t hmp; |
| 3177 | hammer_inode_t ip; |
| 3178 | struct bio *bio; |
| 3179 | struct buf *bp; |
| 3180 | int blksize __debugvar; |
| 3181 | int bytes; |
| 3182 | int error; |
| 3183 | |
| 3184 | bio = ap->a_bio; |
| 3185 | bp = bio->bio_buf; |
| 3186 | ip = ap->a_vp->v_data; |
| 3187 | hmp = ip->hmp; |
| 3188 | |
| 3189 | blksize = hammer_blocksize(bio->bio_offset); |
| 3190 | KKASSERT(bp->b_bufsize == blksize); |
| 3191 | |
| 3192 | if (ip->flags & HAMMER_INODE_RO) { |
| 3193 | bp->b_error = EROFS; |
| 3194 | bp->b_flags |= B_ERROR; |
| 3195 | biodone(ap->a_bio); |
| 3196 | return(EROFS); |
| 3197 | } |
| 3198 | |
| 3199 | lwkt_gettoken(&hmp->fs_token); |
| 3200 | |
| 3201 | /* |
| 3202 | * Disallow swapcache operation on the vnode buffer if double |
| 3203 | * buffering is enabled, the swapcache will get the data via |
| 3204 | * the block device buffer. |
| 3205 | */ |
| 3206 | if (hammer_double_buffer) |
| 3207 | bp->b_flags |= B_NOTMETA; |
| 3208 | |
| 3209 | /* |
| 3210 | * Interlock with inode destruction (no in-kernel or directory |
| 3211 | * topology visibility). If we queue new IO while trying to |
| 3212 | * destroy the inode we can deadlock the vtrunc call in |
| 3213 | * hammer_inode_unloadable_check(). |
| 3214 | * |
| 3215 | * Besides, there's no point flushing a bp associated with an |
| 3216 | * inode that is being destroyed on-media and has no kernel |
| 3217 | * references. |
| 3218 | */ |
| 3219 | if ((ip->flags | ip->sync_flags) & |
| 3220 | (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { |
| 3221 | bp->b_resid = 0; |
| 3222 | biodone(ap->a_bio); |
| 3223 | lwkt_reltoken(&hmp->fs_token); |
| 3224 | return(0); |
| 3225 | } |
| 3226 | |
| 3227 | /* |
| 3228 | * Reserve space and issue a direct-write from the front-end. |
| 3229 | * NOTE: The direct_io code will hammer_bread/bcopy smaller |
| 3230 | * allocations. |
| 3231 | * |
| 3232 | * An in-memory record will be installed to reference the storage |
| 3233 | * until the flusher can get to it. |
| 3234 | * |
| 3235 | * Since we own the high level bio the front-end will not try to |
| 3236 | * do a direct-read until the write completes. |
| 3237 | * |
| 3238 | * NOTE: The only time we do not reserve a full-sized buffers |
| 3239 | * worth of data is if the file is small. We do not try to |
| 3240 | * allocate a fragment (from the small-data zone) at the end of |
| 3241 | * an otherwise large file as this can lead to wildly separated |
| 3242 | * data. |
| 3243 | */ |
| 3244 | KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); |
| 3245 | KKASSERT(bio->bio_offset < ip->ino_data.size); |
| 3246 | if (bio->bio_offset || ip->ino_data.size > HAMMER_HBUFSIZE) |
| 3247 | bytes = bp->b_bufsize; |
| 3248 | else |
| 3249 | bytes = HAMMER_DATA_DOALIGN_WITH(int, ip->ino_data.size); |
| 3250 | |
| 3251 | record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, |
| 3252 | bytes, &error); |
| 3253 | |
| 3254 | /* |
| 3255 | * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated |
| 3256 | * in hammer_vop_write(). We must flag the record so the proper |
| 3257 | * REDO_TERM_WRITE entry is generated during the flush. |
| 3258 | */ |
| 3259 | if (record) { |
| 3260 | if (bp->b_flags & B_VFSFLAG1) { |
| 3261 | record->flags |= HAMMER_RECF_REDO; |
| 3262 | bp->b_flags &= ~B_VFSFLAG1; |
| 3263 | } |
| 3264 | hammer_io_direct_write(hmp, bio, record); |
| 3265 | if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) |
| 3266 | hammer_flush_inode(ip, 0); |
| 3267 | } else { |
| 3268 | bp->b_bio2.bio_offset = NOOFFSET; |
| 3269 | bp->b_error = error; |
| 3270 | bp->b_flags |= B_ERROR; |
| 3271 | biodone(ap->a_bio); |
| 3272 | } |
| 3273 | lwkt_reltoken(&hmp->fs_token); |
| 3274 | return(error); |
| 3275 | } |
| 3276 | |
| 3277 | /* |
| 3278 | * dounlink - disconnect a directory entry |
| 3279 | * |
| 3280 | * XXX whiteout support not really in yet |
| 3281 | */ |
| 3282 | static int |
| 3283 | hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, |
| 3284 | struct vnode *dvp, struct ucred *cred, |
| 3285 | int flags, int isdir) |
| 3286 | { |
| 3287 | struct namecache *ncp; |
| 3288 | hammer_inode_t dip; |
| 3289 | hammer_inode_t ip; |
| 3290 | hammer_mount_t hmp; |
| 3291 | struct hammer_cursor cursor; |
| 3292 | int64_t namekey; |
| 3293 | uint32_t max_iterations; |
| 3294 | int nlen, error; |
| 3295 | |
| 3296 | /* |
| 3297 | * Calculate the namekey and setup the key range for the scan. This |
| 3298 | * works kinda like a chained hash table where the lower 32 bits |
| 3299 | * of the namekey synthesize the chain. |
| 3300 | * |
| 3301 | * The key range is inclusive of both key_beg and key_end. |
| 3302 | */ |
| 3303 | dip = VTOI(dvp); |
| 3304 | ncp = nch->ncp; |
| 3305 | hmp = dip->hmp; |
| 3306 | |
| 3307 | if (dip->flags & HAMMER_INODE_RO) |
| 3308 | return (EROFS); |
| 3309 | |
| 3310 | namekey = hammer_direntry_namekey(dip, ncp->nc_name, ncp->nc_nlen, |
| 3311 | &max_iterations); |
| 3312 | retry: |
| 3313 | hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); |
| 3314 | cursor.key_beg.localization = dip->obj_localization | |
| 3315 | hammer_dir_localization(dip); |
| 3316 | cursor.key_beg.obj_id = dip->obj_id; |
| 3317 | cursor.key_beg.key = namekey; |
| 3318 | cursor.key_beg.create_tid = 0; |
| 3319 | cursor.key_beg.delete_tid = 0; |
| 3320 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 3321 | cursor.key_beg.obj_type = 0; |
| 3322 | |
| 3323 | cursor.key_end = cursor.key_beg; |
| 3324 | cursor.key_end.key += max_iterations; |
| 3325 | cursor.asof = dip->obj_asof; |
| 3326 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 3327 | |
| 3328 | /* |
| 3329 | * Scan all matching records (the chain), locate the one matching |
| 3330 | * the requested path component. info->last_error contains the |
| 3331 | * error code on search termination and could be 0, ENOENT, or |
| 3332 | * something else. |
| 3333 | * |
| 3334 | * The hammer_ip_*() functions merge in-memory records with on-disk |
| 3335 | * records for the purposes of the search. |
| 3336 | */ |
| 3337 | error = hammer_ip_first(&cursor); |
| 3338 | |
| 3339 | while (error == 0) { |
| 3340 | error = hammer_ip_resolve_data(&cursor); |
| 3341 | if (error) |
| 3342 | break; |
| 3343 | nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; |
| 3344 | KKASSERT(nlen > 0); |
| 3345 | if (ncp->nc_nlen == nlen && |
| 3346 | bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { |
| 3347 | break; |
| 3348 | } |
| 3349 | error = hammer_ip_next(&cursor); |
| 3350 | } |
| 3351 | |
| 3352 | /* |
| 3353 | * If all is ok we have to get the inode so we can adjust nlinks. |
| 3354 | * To avoid a deadlock with the flusher we must release the inode |
| 3355 | * lock on the directory when acquiring the inode for the entry. |
| 3356 | * |
| 3357 | * If the target is a directory, it must be empty. |
| 3358 | */ |
| 3359 | if (error == 0) { |
| 3360 | hammer_unlock(&cursor.ip->lock); |
| 3361 | ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, |
| 3362 | hmp->asof, |
| 3363 | cursor.data->entry.localization, |
| 3364 | 0, &error); |
| 3365 | hammer_lock_sh(&cursor.ip->lock); |
| 3366 | if (error == ENOENT) { |
| 3367 | hkprintf("WARNING: Removing dirent w/missing inode " |
| 3368 | "\"%s\"\n" |
| 3369 | "\tobj_id = %016jx\n", |
| 3370 | ncp->nc_name, |
| 3371 | (intmax_t)cursor.data->entry.obj_id); |
| 3372 | error = 0; |
| 3373 | } |
| 3374 | |
| 3375 | /* |
| 3376 | * If isdir >= 0 we validate that the entry is or is not a |
| 3377 | * directory. If isdir < 0 we don't care. |
| 3378 | */ |
| 3379 | if (error == 0 && isdir >= 0 && ip) { |
| 3380 | if (isdir && |
| 3381 | ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { |
| 3382 | error = ENOTDIR; |
| 3383 | } else if (isdir == 0 && |
| 3384 | ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { |
| 3385 | error = EISDIR; |
| 3386 | } |
| 3387 | } |
| 3388 | |
| 3389 | /* |
| 3390 | * If we are trying to remove a directory the directory must |
| 3391 | * be empty. |
| 3392 | * |
| 3393 | * The check directory code can loop and deadlock/retry. Our |
| 3394 | * own cursor's node locks must be released to avoid a 3-way |
| 3395 | * deadlock with the flusher if the check directory code |
| 3396 | * blocks. |
| 3397 | * |
| 3398 | * If any changes whatsoever have been made to the cursor |
| 3399 | * set EDEADLK and retry. |
| 3400 | * |
| 3401 | * WARNING: See warnings in hammer_unlock_cursor() |
| 3402 | * function. |
| 3403 | */ |
| 3404 | if (error == 0 && ip && ip->ino_data.obj_type == |
| 3405 | HAMMER_OBJTYPE_DIRECTORY) { |
| 3406 | hammer_unlock_cursor(&cursor); |
| 3407 | error = hammer_ip_check_directory_empty(trans, ip); |
| 3408 | hammer_lock_cursor(&cursor); |
| 3409 | if (cursor.flags & HAMMER_CURSOR_RETEST) { |
| 3410 | hkprintf("Warning: avoided deadlock " |
| 3411 | "on rmdir '%s'\n", |
| 3412 | ncp->nc_name); |
| 3413 | error = EDEADLK; |
| 3414 | } |
| 3415 | } |
| 3416 | |
| 3417 | /* |
| 3418 | * Delete the directory entry. |
| 3419 | * |
| 3420 | * WARNING: hammer_ip_del_direntry() may have to terminate |
| 3421 | * the cursor to avoid a deadlock. It is ok to call |
| 3422 | * hammer_done_cursor() twice. |
| 3423 | */ |
| 3424 | if (error == 0) { |
| 3425 | error = hammer_ip_del_direntry(trans, &cursor, |
| 3426 | dip, ip); |
| 3427 | } |
| 3428 | hammer_done_cursor(&cursor); |
| 3429 | if (error == 0) { |
| 3430 | /* |
| 3431 | * Tell the namecache that we are now unlinked. |
| 3432 | */ |
| 3433 | cache_unlink(nch); |
| 3434 | |
| 3435 | /* |
| 3436 | * NOTE: ip->vp, if non-NULL, cannot be directly |
| 3437 | * referenced without formally acquiring the |
| 3438 | * vp since the vp might have zero refs on it, |
| 3439 | * or in the middle of a reclaim, etc. |
| 3440 | * |
| 3441 | * NOTE: The cache_setunresolved() can rip the vp |
| 3442 | * out from under us since the vp may not have |
| 3443 | * any refs, in which case ip->vp will be NULL |
| 3444 | * from the outset. |
| 3445 | */ |
| 3446 | while (ip && ip->vp) { |
| 3447 | struct vnode *vp; |
| 3448 | |
| 3449 | error = hammer_get_vnode(ip, &vp); |
| 3450 | if (error == 0 && vp) { |
| 3451 | vn_unlock(vp); |
| 3452 | hammer_knote(ip->vp, NOTE_DELETE); |
| 3453 | #if 0 |
| 3454 | /* |
| 3455 | * Don't do this, it can deadlock |
| 3456 | * on concurrent rm's of hardlinks. |
| 3457 | * Shouldn't be needed any more. |
| 3458 | */ |
| 3459 | cache_inval_vp(ip->vp, CINV_DESTROY); |
| 3460 | #endif |
| 3461 | vrele(vp); |
| 3462 | break; |
| 3463 | } |
| 3464 | hdkprintf("ip/vp race1 avoided\n"); |
| 3465 | } |
| 3466 | } |
| 3467 | if (ip) |
| 3468 | hammer_rel_inode(ip, 0); |
| 3469 | } else { |
| 3470 | hammer_done_cursor(&cursor); |
| 3471 | } |
| 3472 | if (error == EDEADLK) |
| 3473 | goto retry; |
| 3474 | |
| 3475 | return (error); |
| 3476 | } |
| 3477 | |
| 3478 | /************************************************************************ |
| 3479 | * FIFO AND SPECFS OPS * |
| 3480 | ************************************************************************ |
| 3481 | * |
| 3482 | */ |
| 3483 | static int |
| 3484 | hammer_vop_fifoclose (struct vop_close_args *ap) |
| 3485 | { |
| 3486 | /* XXX update itimes */ |
| 3487 | return (VOCALL(&fifo_vnode_vops, &ap->a_head)); |
| 3488 | } |
| 3489 | |
| 3490 | static int |
| 3491 | hammer_vop_fiforead (struct vop_read_args *ap) |
| 3492 | { |
| 3493 | int error; |
| 3494 | |
| 3495 | error = VOCALL(&fifo_vnode_vops, &ap->a_head); |
| 3496 | /* XXX update access time */ |
| 3497 | return (error); |
| 3498 | } |
| 3499 | |
| 3500 | static int |
| 3501 | hammer_vop_fifowrite (struct vop_write_args *ap) |
| 3502 | { |
| 3503 | int error; |
| 3504 | |
| 3505 | error = VOCALL(&fifo_vnode_vops, &ap->a_head); |
| 3506 | /* XXX update access time */ |
| 3507 | return (error); |
| 3508 | } |
| 3509 | |
| 3510 | static |
| 3511 | int |
| 3512 | hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) |
| 3513 | { |
| 3514 | int error; |
| 3515 | |
| 3516 | error = VOCALL(&fifo_vnode_vops, &ap->a_head); |
| 3517 | if (error) |
| 3518 | error = hammer_vop_kqfilter(ap); |
| 3519 | return(error); |
| 3520 | } |
| 3521 | |
| 3522 | /************************************************************************ |
| 3523 | * KQFILTER OPS * |
| 3524 | ************************************************************************ |
| 3525 | * |
| 3526 | */ |
| 3527 | static void filt_hammerdetach(struct knote *kn); |
| 3528 | static int filt_hammerread(struct knote *kn, long hint); |
| 3529 | static int filt_hammerwrite(struct knote *kn, long hint); |
| 3530 | static int filt_hammervnode(struct knote *kn, long hint); |
| 3531 | |
| 3532 | static struct filterops hammerread_filtops = |
| 3533 | { FILTEROP_ISFD | FILTEROP_MPSAFE, |
| 3534 | NULL, filt_hammerdetach, filt_hammerread }; |
| 3535 | static struct filterops hammerwrite_filtops = |
| 3536 | { FILTEROP_ISFD | FILTEROP_MPSAFE, |
| 3537 | NULL, filt_hammerdetach, filt_hammerwrite }; |
| 3538 | static struct filterops hammervnode_filtops = |
| 3539 | { FILTEROP_ISFD | FILTEROP_MPSAFE, |
| 3540 | NULL, filt_hammerdetach, filt_hammervnode }; |
| 3541 | |
| 3542 | static |
| 3543 | int |
| 3544 | hammer_vop_kqfilter(struct vop_kqfilter_args *ap) |
| 3545 | { |
| 3546 | struct vnode *vp = ap->a_vp; |
| 3547 | struct knote *kn = ap->a_kn; |
| 3548 | |
| 3549 | switch (kn->kn_filter) { |
| 3550 | case EVFILT_READ: |
| 3551 | kn->kn_fop = &hammerread_filtops; |
| 3552 | break; |
| 3553 | case EVFILT_WRITE: |
| 3554 | kn->kn_fop = &hammerwrite_filtops; |
| 3555 | break; |
| 3556 | case EVFILT_VNODE: |
| 3557 | kn->kn_fop = &hammervnode_filtops; |
| 3558 | break; |
| 3559 | default: |
| 3560 | return (EOPNOTSUPP); |
| 3561 | } |
| 3562 | |
| 3563 | kn->kn_hook = (caddr_t)vp; |
| 3564 | |
| 3565 | knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); |
| 3566 | |
| 3567 | return(0); |
| 3568 | } |
| 3569 | |
| 3570 | static void |
| 3571 | filt_hammerdetach(struct knote *kn) |
| 3572 | { |
| 3573 | struct vnode *vp = (void *)kn->kn_hook; |
| 3574 | |
| 3575 | knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); |
| 3576 | } |
| 3577 | |
| 3578 | static int |
| 3579 | filt_hammerread(struct knote *kn, long hint) |
| 3580 | { |
| 3581 | struct vnode *vp = (void *)kn->kn_hook; |
| 3582 | hammer_inode_t ip = VTOI(vp); |
| 3583 | hammer_mount_t hmp = ip->hmp; |
| 3584 | off_t off; |
| 3585 | |
| 3586 | if (hint == NOTE_REVOKE) { |
| 3587 | kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); |
| 3588 | return(1); |
| 3589 | } |
| 3590 | lwkt_gettoken(&hmp->fs_token); /* XXX use per-ip-token */ |
| 3591 | off = ip->ino_data.size - kn->kn_fp->f_offset; |
| 3592 | kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; |
| 3593 | lwkt_reltoken(&hmp->fs_token); |
| 3594 | if (kn->kn_sfflags & NOTE_OLDAPI) |
| 3595 | return(1); |
| 3596 | return (kn->kn_data != 0); |
| 3597 | } |
| 3598 | |
| 3599 | static int |
| 3600 | filt_hammerwrite(struct knote *kn, long hint) |
| 3601 | { |
| 3602 | if (hint == NOTE_REVOKE) |
| 3603 | kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); |
| 3604 | kn->kn_data = 0; |
| 3605 | return (1); |
| 3606 | } |
| 3607 | |
| 3608 | static int |
| 3609 | filt_hammervnode(struct knote *kn, long hint) |
| 3610 | { |
| 3611 | if (kn->kn_sfflags & hint) |
| 3612 | kn->kn_fflags |= hint; |
| 3613 | if (hint == NOTE_REVOKE) { |
| 3614 | kn->kn_flags |= (EV_EOF | EV_NODATA); |
| 3615 | return (1); |
| 3616 | } |
| 3617 | return (kn->kn_fflags != 0); |
| 3618 | } |
| 3619 | |