| 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 | * $DragonFly: src/sys/vfs/hammer/hammer_vnops.c,v 1.102 2008/10/16 17:24:16 dillon Exp $ |
| 35 | */ |
| 36 | |
| 37 | #include <sys/param.h> |
| 38 | #include <sys/systm.h> |
| 39 | #include <sys/kernel.h> |
| 40 | #include <sys/fcntl.h> |
| 41 | #include <sys/namecache.h> |
| 42 | #include <sys/vnode.h> |
| 43 | #include <sys/lockf.h> |
| 44 | #include <sys/event.h> |
| 45 | #include <sys/stat.h> |
| 46 | #include <sys/dirent.h> |
| 47 | #include <sys/file.h> |
| 48 | #include <vm/vm_extern.h> |
| 49 | #include <vfs/fifofs/fifo.h> |
| 50 | |
| 51 | #include <sys/mplock2.h> |
| 52 | |
| 53 | #include "hammer.h" |
| 54 | |
| 55 | /* |
| 56 | * USERFS VNOPS |
| 57 | */ |
| 58 | /*static int hammer_vop_vnoperate(struct vop_generic_args *);*/ |
| 59 | static int hammer_vop_fsync(struct vop_fsync_args *); |
| 60 | static int hammer_vop_read(struct vop_read_args *); |
| 61 | static int hammer_vop_write(struct vop_write_args *); |
| 62 | static int hammer_vop_access(struct vop_access_args *); |
| 63 | static int hammer_vop_advlock(struct vop_advlock_args *); |
| 64 | static int hammer_vop_close(struct vop_close_args *); |
| 65 | static int hammer_vop_ncreate(struct vop_ncreate_args *); |
| 66 | static int hammer_vop_getattr(struct vop_getattr_args *); |
| 67 | static int hammer_vop_nresolve(struct vop_nresolve_args *); |
| 68 | static int hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *); |
| 69 | static int hammer_vop_nlink(struct vop_nlink_args *); |
| 70 | static int hammer_vop_nmkdir(struct vop_nmkdir_args *); |
| 71 | static int hammer_vop_nmknod(struct vop_nmknod_args *); |
| 72 | static int hammer_vop_open(struct vop_open_args *); |
| 73 | static int hammer_vop_print(struct vop_print_args *); |
| 74 | static int hammer_vop_readdir(struct vop_readdir_args *); |
| 75 | static int hammer_vop_readlink(struct vop_readlink_args *); |
| 76 | static int hammer_vop_nremove(struct vop_nremove_args *); |
| 77 | static int hammer_vop_nrename(struct vop_nrename_args *); |
| 78 | static int hammer_vop_nrmdir(struct vop_nrmdir_args *); |
| 79 | static int hammer_vop_markatime(struct vop_markatime_args *); |
| 80 | static int hammer_vop_setattr(struct vop_setattr_args *); |
| 81 | static int hammer_vop_strategy(struct vop_strategy_args *); |
| 82 | static int hammer_vop_bmap(struct vop_bmap_args *ap); |
| 83 | static int hammer_vop_nsymlink(struct vop_nsymlink_args *); |
| 84 | static int hammer_vop_nwhiteout(struct vop_nwhiteout_args *); |
| 85 | static int hammer_vop_ioctl(struct vop_ioctl_args *); |
| 86 | static int hammer_vop_mountctl(struct vop_mountctl_args *); |
| 87 | static int hammer_vop_kqfilter (struct vop_kqfilter_args *); |
| 88 | |
| 89 | static int hammer_vop_fifoclose (struct vop_close_args *); |
| 90 | static int hammer_vop_fiforead (struct vop_read_args *); |
| 91 | static int hammer_vop_fifowrite (struct vop_write_args *); |
| 92 | static int hammer_vop_fifokqfilter (struct vop_kqfilter_args *); |
| 93 | |
| 94 | struct vop_ops hammer_vnode_vops = { |
| 95 | .vop_default = vop_defaultop, |
| 96 | .vop_fsync = hammer_vop_fsync, |
| 97 | .vop_getpages = vop_stdgetpages, |
| 98 | .vop_putpages = vop_stdputpages, |
| 99 | .vop_read = hammer_vop_read, |
| 100 | .vop_write = hammer_vop_write, |
| 101 | .vop_access = hammer_vop_access, |
| 102 | .vop_advlock = hammer_vop_advlock, |
| 103 | .vop_close = hammer_vop_close, |
| 104 | .vop_ncreate = hammer_vop_ncreate, |
| 105 | .vop_getattr = hammer_vop_getattr, |
| 106 | .vop_inactive = hammer_vop_inactive, |
| 107 | .vop_reclaim = hammer_vop_reclaim, |
| 108 | .vop_nresolve = hammer_vop_nresolve, |
| 109 | .vop_nlookupdotdot = hammer_vop_nlookupdotdot, |
| 110 | .vop_nlink = hammer_vop_nlink, |
| 111 | .vop_nmkdir = hammer_vop_nmkdir, |
| 112 | .vop_nmknod = hammer_vop_nmknod, |
| 113 | .vop_open = hammer_vop_open, |
| 114 | .vop_pathconf = vop_stdpathconf, |
| 115 | .vop_print = hammer_vop_print, |
| 116 | .vop_readdir = hammer_vop_readdir, |
| 117 | .vop_readlink = hammer_vop_readlink, |
| 118 | .vop_nremove = hammer_vop_nremove, |
| 119 | .vop_nrename = hammer_vop_nrename, |
| 120 | .vop_nrmdir = hammer_vop_nrmdir, |
| 121 | .vop_markatime = hammer_vop_markatime, |
| 122 | .vop_setattr = hammer_vop_setattr, |
| 123 | .vop_bmap = hammer_vop_bmap, |
| 124 | .vop_strategy = hammer_vop_strategy, |
| 125 | .vop_nsymlink = hammer_vop_nsymlink, |
| 126 | .vop_nwhiteout = hammer_vop_nwhiteout, |
| 127 | .vop_ioctl = hammer_vop_ioctl, |
| 128 | .vop_mountctl = hammer_vop_mountctl, |
| 129 | .vop_kqfilter = hammer_vop_kqfilter |
| 130 | }; |
| 131 | |
| 132 | struct vop_ops hammer_spec_vops = { |
| 133 | .vop_default = vop_defaultop, |
| 134 | .vop_fsync = hammer_vop_fsync, |
| 135 | .vop_read = vop_stdnoread, |
| 136 | .vop_write = vop_stdnowrite, |
| 137 | .vop_access = hammer_vop_access, |
| 138 | .vop_close = hammer_vop_close, |
| 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 | }; |
| 145 | |
| 146 | struct vop_ops hammer_fifo_vops = { |
| 147 | .vop_default = fifo_vnoperate, |
| 148 | .vop_fsync = hammer_vop_fsync, |
| 149 | .vop_read = hammer_vop_fiforead, |
| 150 | .vop_write = hammer_vop_fifowrite, |
| 151 | .vop_access = hammer_vop_access, |
| 152 | .vop_close = hammer_vop_fifoclose, |
| 153 | .vop_markatime = hammer_vop_markatime, |
| 154 | .vop_getattr = hammer_vop_getattr, |
| 155 | .vop_inactive = hammer_vop_inactive, |
| 156 | .vop_reclaim = hammer_vop_reclaim, |
| 157 | .vop_setattr = hammer_vop_setattr, |
| 158 | .vop_kqfilter = hammer_vop_fifokqfilter |
| 159 | }; |
| 160 | |
| 161 | static __inline |
| 162 | void |
| 163 | hammer_knote(struct vnode *vp, int flags) |
| 164 | { |
| 165 | if (flags) |
| 166 | KNOTE(&vp->v_pollinfo.vpi_selinfo.si_note, flags); |
| 167 | } |
| 168 | |
| 169 | #ifdef DEBUG_TRUNCATE |
| 170 | struct hammer_inode *HammerTruncIp; |
| 171 | #endif |
| 172 | |
| 173 | static int hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, |
| 174 | struct vnode *dvp, struct ucred *cred, |
| 175 | int flags, int isdir); |
| 176 | static int hammer_vop_strategy_read(struct vop_strategy_args *ap); |
| 177 | static int hammer_vop_strategy_write(struct vop_strategy_args *ap); |
| 178 | |
| 179 | #if 0 |
| 180 | static |
| 181 | int |
| 182 | hammer_vop_vnoperate(struct vop_generic_args *) |
| 183 | { |
| 184 | return (VOCALL(&hammer_vnode_vops, ap)); |
| 185 | } |
| 186 | #endif |
| 187 | |
| 188 | /* |
| 189 | * hammer_vop_fsync { vp, waitfor } |
| 190 | * |
| 191 | * fsync() an inode to disk and wait for it to be completely committed |
| 192 | * such that the information would not be undone if a crash occured after |
| 193 | * return. |
| 194 | * |
| 195 | * NOTE: HAMMER's fsync()'s are going to remain expensive until we implement |
| 196 | * a REDO log. A sysctl is provided to relax HAMMER's fsync() |
| 197 | * operation. |
| 198 | * |
| 199 | * Ultimately the combination of a REDO log and use of fast storage |
| 200 | * to front-end cluster caches will make fsync fast, but it aint |
| 201 | * here yet. And, in anycase, we need real transactional |
| 202 | * all-or-nothing features which are not restricted to a single file. |
| 203 | */ |
| 204 | static |
| 205 | int |
| 206 | hammer_vop_fsync(struct vop_fsync_args *ap) |
| 207 | { |
| 208 | hammer_inode_t ip = VTOI(ap->a_vp); |
| 209 | hammer_mount_t hmp = ip->hmp; |
| 210 | int waitfor = ap->a_waitfor; |
| 211 | int mode; |
| 212 | |
| 213 | /* |
| 214 | * Fsync rule relaxation (default is either full synchronous flush |
| 215 | * or REDO semantics with synchronous flush). |
| 216 | */ |
| 217 | if (ap->a_flags & VOP_FSYNC_SYSCALL) { |
| 218 | switch(hammer_fsync_mode) { |
| 219 | case 0: |
| 220 | mode0: |
| 221 | /* no REDO, full synchronous flush */ |
| 222 | goto skip; |
| 223 | case 1: |
| 224 | mode1: |
| 225 | /* no REDO, full asynchronous flush */ |
| 226 | if (waitfor == MNT_WAIT) |
| 227 | waitfor = MNT_NOWAIT; |
| 228 | goto skip; |
| 229 | case 2: |
| 230 | /* REDO semantics, synchronous flush */ |
| 231 | if (hmp->version < HAMMER_VOL_VERSION_FOUR) |
| 232 | goto mode0; |
| 233 | mode = HAMMER_FLUSH_UNDOS_AUTO; |
| 234 | break; |
| 235 | case 3: |
| 236 | /* REDO semantics, relaxed asynchronous flush */ |
| 237 | if (hmp->version < HAMMER_VOL_VERSION_FOUR) |
| 238 | goto mode1; |
| 239 | mode = HAMMER_FLUSH_UNDOS_RELAXED; |
| 240 | if (waitfor == MNT_WAIT) |
| 241 | waitfor = MNT_NOWAIT; |
| 242 | break; |
| 243 | case 4: |
| 244 | /* ignore the fsync() system call */ |
| 245 | return(0); |
| 246 | default: |
| 247 | /* we have to do something */ |
| 248 | mode = HAMMER_FLUSH_UNDOS_RELAXED; |
| 249 | if (waitfor == MNT_WAIT) |
| 250 | waitfor = MNT_NOWAIT; |
| 251 | break; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Fast fsync only needs to flush the UNDO/REDO fifo if |
| 256 | * HAMMER_INODE_REDO is non-zero and the only modifications |
| 257 | * made to the file are write or write-extends. |
| 258 | */ |
| 259 | if ((ip->flags & HAMMER_INODE_REDO) && |
| 260 | (ip->flags & HAMMER_INODE_MODMASK_NOREDO) == 0 |
| 261 | ) { |
| 262 | ++hammer_count_fsyncs; |
| 263 | hammer_flusher_flush_undos(hmp, mode); |
| 264 | ip->redo_count = 0; |
| 265 | return(0); |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * REDO is enabled by fsync(), the idea being we really only |
| 270 | * want to lay down REDO records when programs are using |
| 271 | * fsync() heavily. The first fsync() on the file starts |
| 272 | * the gravy train going and later fsync()s keep it hot by |
| 273 | * resetting the redo_count. |
| 274 | * |
| 275 | * We weren't running REDOs before now so we have to fall |
| 276 | * through and do a full fsync of what we have. |
| 277 | */ |
| 278 | if (hmp->version >= HAMMER_VOL_VERSION_FOUR && |
| 279 | (hmp->flags & HAMMER_MOUNT_REDO_RECOVERY_RUN) == 0) { |
| 280 | ip->flags |= HAMMER_INODE_REDO; |
| 281 | ip->redo_count = 0; |
| 282 | } |
| 283 | } |
| 284 | skip: |
| 285 | |
| 286 | /* |
| 287 | * Do a full flush sequence. |
| 288 | */ |
| 289 | ++hammer_count_fsyncs; |
| 290 | vfsync(ap->a_vp, waitfor, 1, NULL, NULL); |
| 291 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 292 | if (waitfor == MNT_WAIT) { |
| 293 | vn_unlock(ap->a_vp); |
| 294 | hammer_wait_inode(ip); |
| 295 | vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); |
| 296 | } |
| 297 | return (ip->error); |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * hammer_vop_read { vp, uio, ioflag, cred } |
| 302 | * |
| 303 | * MPALMOSTSAFE |
| 304 | */ |
| 305 | static |
| 306 | int |
| 307 | hammer_vop_read(struct vop_read_args *ap) |
| 308 | { |
| 309 | struct hammer_transaction trans; |
| 310 | hammer_inode_t ip; |
| 311 | off_t offset; |
| 312 | struct buf *bp; |
| 313 | struct uio *uio; |
| 314 | int error; |
| 315 | int n; |
| 316 | int seqcount; |
| 317 | int ioseqcount; |
| 318 | int blksize; |
| 319 | int got_mplock; |
| 320 | int bigread; |
| 321 | |
| 322 | if (ap->a_vp->v_type != VREG) |
| 323 | return (EINVAL); |
| 324 | ip = VTOI(ap->a_vp); |
| 325 | error = 0; |
| 326 | uio = ap->a_uio; |
| 327 | |
| 328 | /* |
| 329 | * Allow the UIO's size to override the sequential heuristic. |
| 330 | */ |
| 331 | blksize = hammer_blocksize(uio->uio_offset); |
| 332 | seqcount = (uio->uio_resid + (BKVASIZE - 1)) / BKVASIZE; |
| 333 | ioseqcount = (ap->a_ioflag >> 16); |
| 334 | if (seqcount < ioseqcount) |
| 335 | seqcount = ioseqcount; |
| 336 | |
| 337 | /* |
| 338 | * Temporary hack until more of HAMMER can be made MPSAFE. |
| 339 | */ |
| 340 | #ifdef SMP |
| 341 | if (curthread->td_mpcount) { |
| 342 | got_mplock = -1; |
| 343 | hammer_start_transaction(&trans, ip->hmp); |
| 344 | } else { |
| 345 | got_mplock = 0; |
| 346 | } |
| 347 | #else |
| 348 | hammer_start_transaction(&trans, ip->hmp); |
| 349 | got_mplock = -1; |
| 350 | #endif |
| 351 | |
| 352 | /* |
| 353 | * If reading or writing a huge amount of data we have to break |
| 354 | * atomicy and allow the operation to be interrupted by a signal |
| 355 | * or it can DOS the machine. |
| 356 | */ |
| 357 | bigread = (uio->uio_resid > 100 * 1024 * 1024); |
| 358 | |
| 359 | /* |
| 360 | * Access the data typically in HAMMER_BUFSIZE blocks via the |
| 361 | * buffer cache, but HAMMER may use a variable block size based |
| 362 | * on the offset. |
| 363 | * |
| 364 | * XXX Temporary hack, delay the start transaction while we remain |
| 365 | * MPSAFE. NOTE: ino_data.size cannot change while vnode is |
| 366 | * locked-shared. |
| 367 | */ |
| 368 | while (uio->uio_resid > 0 && uio->uio_offset < ip->ino_data.size) { |
| 369 | int64_t base_offset; |
| 370 | int64_t file_limit; |
| 371 | |
| 372 | blksize = hammer_blocksize(uio->uio_offset); |
| 373 | offset = (int)uio->uio_offset & (blksize - 1); |
| 374 | base_offset = uio->uio_offset - offset; |
| 375 | |
| 376 | if (bigread && (error = hammer_signal_check(ip->hmp)) != 0) |
| 377 | break; |
| 378 | |
| 379 | /* |
| 380 | * MPSAFE |
| 381 | */ |
| 382 | bp = getcacheblk(ap->a_vp, base_offset); |
| 383 | if (bp) { |
| 384 | error = 0; |
| 385 | goto skip; |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * MPUNSAFE |
| 390 | */ |
| 391 | if (got_mplock == 0) { |
| 392 | got_mplock = 1; |
| 393 | get_mplock(); |
| 394 | hammer_start_transaction(&trans, ip->hmp); |
| 395 | } |
| 396 | |
| 397 | if (hammer_cluster_enable) { |
| 398 | /* |
| 399 | * Use file_limit to prevent cluster_read() from |
| 400 | * creating buffers of the wrong block size past |
| 401 | * the demarc. |
| 402 | */ |
| 403 | file_limit = ip->ino_data.size; |
| 404 | if (base_offset < HAMMER_XDEMARC && |
| 405 | file_limit > HAMMER_XDEMARC) { |
| 406 | file_limit = HAMMER_XDEMARC; |
| 407 | } |
| 408 | error = cluster_read(ap->a_vp, |
| 409 | file_limit, base_offset, |
| 410 | blksize, MAXPHYS, |
| 411 | seqcount, &bp); |
| 412 | } else { |
| 413 | error = bread(ap->a_vp, base_offset, blksize, &bp); |
| 414 | } |
| 415 | if (error) { |
| 416 | brelse(bp); |
| 417 | break; |
| 418 | } |
| 419 | skip: |
| 420 | |
| 421 | /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */ |
| 422 | n = blksize - offset; |
| 423 | if (n > uio->uio_resid) |
| 424 | n = uio->uio_resid; |
| 425 | if (n > ip->ino_data.size - uio->uio_offset) |
| 426 | n = (int)(ip->ino_data.size - uio->uio_offset); |
| 427 | error = uiomove((char *)bp->b_data + offset, n, uio); |
| 428 | |
| 429 | /* data has a lower priority then meta-data */ |
| 430 | bp->b_flags |= B_AGE; |
| 431 | bqrelse(bp); |
| 432 | if (error) |
| 433 | break; |
| 434 | hammer_stats_file_read += n; |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * XXX only update the atime if we had to get the MP lock. |
| 439 | * XXX hack hack hack, fixme. |
| 440 | */ |
| 441 | if (got_mplock) { |
| 442 | if ((ip->flags & HAMMER_INODE_RO) == 0 && |
| 443 | (ip->hmp->mp->mnt_flag & MNT_NOATIME) == 0) { |
| 444 | ip->ino_data.atime = trans.time; |
| 445 | hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); |
| 446 | } |
| 447 | hammer_done_transaction(&trans); |
| 448 | if (got_mplock > 0) |
| 449 | rel_mplock(); |
| 450 | } |
| 451 | return (error); |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * hammer_vop_write { vp, uio, ioflag, cred } |
| 456 | */ |
| 457 | static |
| 458 | int |
| 459 | hammer_vop_write(struct vop_write_args *ap) |
| 460 | { |
| 461 | struct hammer_transaction trans; |
| 462 | struct hammer_inode *ip; |
| 463 | hammer_mount_t hmp; |
| 464 | struct uio *uio; |
| 465 | int offset; |
| 466 | off_t base_offset; |
| 467 | struct buf *bp; |
| 468 | int kflags; |
| 469 | int error; |
| 470 | int n; |
| 471 | int flags; |
| 472 | int seqcount; |
| 473 | int bigwrite; |
| 474 | |
| 475 | if (ap->a_vp->v_type != VREG) |
| 476 | return (EINVAL); |
| 477 | ip = VTOI(ap->a_vp); |
| 478 | hmp = ip->hmp; |
| 479 | error = 0; |
| 480 | kflags = 0; |
| 481 | seqcount = ap->a_ioflag >> 16; |
| 482 | |
| 483 | if (ip->flags & HAMMER_INODE_RO) |
| 484 | return (EROFS); |
| 485 | |
| 486 | /* |
| 487 | * Create a transaction to cover the operations we perform. |
| 488 | */ |
| 489 | hammer_start_transaction(&trans, hmp); |
| 490 | uio = ap->a_uio; |
| 491 | |
| 492 | /* |
| 493 | * Check append mode |
| 494 | */ |
| 495 | if (ap->a_ioflag & IO_APPEND) |
| 496 | uio->uio_offset = ip->ino_data.size; |
| 497 | |
| 498 | /* |
| 499 | * Check for illegal write offsets. Valid range is 0...2^63-1. |
| 500 | * |
| 501 | * NOTE: the base_off assignment is required to work around what |
| 502 | * I consider to be a GCC-4 optimization bug. |
| 503 | */ |
| 504 | if (uio->uio_offset < 0) { |
| 505 | hammer_done_transaction(&trans); |
| 506 | return (EFBIG); |
| 507 | } |
| 508 | base_offset = uio->uio_offset + uio->uio_resid; /* work around gcc-4 */ |
| 509 | if (uio->uio_resid > 0 && base_offset <= uio->uio_offset) { |
| 510 | hammer_done_transaction(&trans); |
| 511 | return (EFBIG); |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * If reading or writing a huge amount of data we have to break |
| 516 | * atomicy and allow the operation to be interrupted by a signal |
| 517 | * or it can DOS the machine. |
| 518 | * |
| 519 | * Preset redo_count so we stop generating REDOs earlier if the |
| 520 | * limit is exceeded. |
| 521 | */ |
| 522 | bigwrite = (uio->uio_resid > 100 * 1024 * 1024); |
| 523 | if ((ip->flags & HAMMER_INODE_REDO) && |
| 524 | ip->redo_count < hammer_limit_redo) { |
| 525 | ip->redo_count += uio->uio_resid; |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Access the data typically in HAMMER_BUFSIZE blocks via the |
| 530 | * buffer cache, but HAMMER may use a variable block size based |
| 531 | * on the offset. |
| 532 | */ |
| 533 | while (uio->uio_resid > 0) { |
| 534 | int fixsize = 0; |
| 535 | int blksize; |
| 536 | int blkmask; |
| 537 | int trivial; |
| 538 | int endofblk; |
| 539 | off_t nsize; |
| 540 | |
| 541 | if ((error = hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE)) != 0) |
| 542 | break; |
| 543 | if (bigwrite && (error = hammer_signal_check(hmp)) != 0) |
| 544 | break; |
| 545 | |
| 546 | blksize = hammer_blocksize(uio->uio_offset); |
| 547 | |
| 548 | /* |
| 549 | * Do not allow HAMMER to blow out the buffer cache. Very |
| 550 | * large UIOs can lockout other processes due to bwillwrite() |
| 551 | * mechanics. |
| 552 | * |
| 553 | * The hammer inode is not locked during these operations. |
| 554 | * The vnode is locked which can interfere with the pageout |
| 555 | * daemon for non-UIO_NOCOPY writes but should not interfere |
| 556 | * with the buffer cache. Even so, we cannot afford to |
| 557 | * allow the pageout daemon to build up too many dirty buffer |
| 558 | * cache buffers. |
| 559 | * |
| 560 | * Only call this if we aren't being recursively called from |
| 561 | * a virtual disk device (vn), else we may deadlock. |
| 562 | */ |
| 563 | if ((ap->a_ioflag & IO_RECURSE) == 0) |
| 564 | bwillwrite(blksize); |
| 565 | |
| 566 | /* |
| 567 | * Control the number of pending records associated with |
| 568 | * this inode. If too many have accumulated start a |
| 569 | * flush. Try to maintain a pipeline with the flusher. |
| 570 | */ |
| 571 | if (ip->rsv_recs >= hammer_limit_inode_recs) { |
| 572 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 573 | } |
| 574 | if (ip->rsv_recs >= hammer_limit_inode_recs * 2) { |
| 575 | while (ip->rsv_recs >= hammer_limit_inode_recs) { |
| 576 | tsleep(&ip->rsv_recs, 0, "hmrwww", hz); |
| 577 | } |
| 578 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 579 | } |
| 580 | |
| 581 | #if 0 |
| 582 | /* |
| 583 | * Do not allow HAMMER to blow out system memory by |
| 584 | * accumulating too many records. Records are so well |
| 585 | * decoupled from the buffer cache that it is possible |
| 586 | * for userland to push data out to the media via |
| 587 | * direct-write, but build up the records queued to the |
| 588 | * backend faster then the backend can flush them out. |
| 589 | * HAMMER has hit its write limit but the frontend has |
| 590 | * no pushback to slow it down. |
| 591 | */ |
| 592 | if (hmp->rsv_recs > hammer_limit_recs / 2) { |
| 593 | /* |
| 594 | * Get the inode on the flush list |
| 595 | */ |
| 596 | if (ip->rsv_recs >= 64) |
| 597 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 598 | else if (ip->rsv_recs >= 16) |
| 599 | hammer_flush_inode(ip, 0); |
| 600 | |
| 601 | /* |
| 602 | * Keep the flusher going if the system keeps |
| 603 | * queueing records. |
| 604 | */ |
| 605 | delta = hmp->count_newrecords - |
| 606 | hmp->last_newrecords; |
| 607 | if (delta < 0 || delta > hammer_limit_recs / 2) { |
| 608 | hmp->last_newrecords = hmp->count_newrecords; |
| 609 | hammer_sync_hmp(hmp, MNT_NOWAIT); |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * If we have gotten behind start slowing |
| 614 | * down the writers. |
| 615 | */ |
| 616 | delta = (hmp->rsv_recs - hammer_limit_recs) * |
| 617 | hz / hammer_limit_recs; |
| 618 | if (delta > 0) |
| 619 | tsleep(&trans, 0, "hmrslo", delta); |
| 620 | } |
| 621 | #endif |
| 622 | |
| 623 | /* |
| 624 | * Calculate the blocksize at the current offset and figure |
| 625 | * out how much we can actually write. |
| 626 | */ |
| 627 | blkmask = blksize - 1; |
| 628 | offset = (int)uio->uio_offset & blkmask; |
| 629 | base_offset = uio->uio_offset & ~(int64_t)blkmask; |
| 630 | n = blksize - offset; |
| 631 | if (n > uio->uio_resid) { |
| 632 | n = uio->uio_resid; |
| 633 | endofblk = 0; |
| 634 | } else { |
| 635 | endofblk = 1; |
| 636 | } |
| 637 | nsize = uio->uio_offset + n; |
| 638 | if (nsize > ip->ino_data.size) { |
| 639 | if (uio->uio_offset > ip->ino_data.size) |
| 640 | trivial = 0; |
| 641 | else |
| 642 | trivial = 1; |
| 643 | nvextendbuf(ap->a_vp, |
| 644 | ip->ino_data.size, |
| 645 | nsize, |
| 646 | hammer_blocksize(ip->ino_data.size), |
| 647 | hammer_blocksize(nsize), |
| 648 | hammer_blockoff(ip->ino_data.size), |
| 649 | hammer_blockoff(nsize), |
| 650 | trivial); |
| 651 | fixsize = 1; |
| 652 | kflags |= NOTE_EXTEND; |
| 653 | } |
| 654 | |
| 655 | if (uio->uio_segflg == UIO_NOCOPY) { |
| 656 | /* |
| 657 | * Issuing a write with the same data backing the |
| 658 | * buffer. Instantiate the buffer to collect the |
| 659 | * backing vm pages, then read-in any missing bits. |
| 660 | * |
| 661 | * This case is used by vop_stdputpages(). |
| 662 | */ |
| 663 | bp = getblk(ap->a_vp, base_offset, |
| 664 | blksize, GETBLK_BHEAVY, 0); |
| 665 | if ((bp->b_flags & B_CACHE) == 0) { |
| 666 | bqrelse(bp); |
| 667 | error = bread(ap->a_vp, base_offset, |
| 668 | blksize, &bp); |
| 669 | } |
| 670 | } else if (offset == 0 && uio->uio_resid >= blksize) { |
| 671 | /* |
| 672 | * Even though we are entirely overwriting the buffer |
| 673 | * we may still have to zero it out to avoid a |
| 674 | * mmap/write visibility issue. |
| 675 | */ |
| 676 | bp = getblk(ap->a_vp, base_offset, blksize, GETBLK_BHEAVY, 0); |
| 677 | if ((bp->b_flags & B_CACHE) == 0) |
| 678 | vfs_bio_clrbuf(bp); |
| 679 | } else if (base_offset >= ip->ino_data.size) { |
| 680 | /* |
| 681 | * If the base offset of the buffer is beyond the |
| 682 | * file EOF, we don't have to issue a read. |
| 683 | */ |
| 684 | bp = getblk(ap->a_vp, base_offset, |
| 685 | blksize, GETBLK_BHEAVY, 0); |
| 686 | vfs_bio_clrbuf(bp); |
| 687 | } else { |
| 688 | /* |
| 689 | * Partial overwrite, read in any missing bits then |
| 690 | * replace the portion being written. |
| 691 | */ |
| 692 | error = bread(ap->a_vp, base_offset, blksize, &bp); |
| 693 | if (error == 0) |
| 694 | bheavy(bp); |
| 695 | } |
| 696 | if (error == 0) |
| 697 | error = uiomove(bp->b_data + offset, n, uio); |
| 698 | |
| 699 | /* |
| 700 | * Generate REDO records if enabled and redo_count will not |
| 701 | * exceeded the limit. |
| 702 | * |
| 703 | * If redo_count exceeds the limit we stop generating records |
| 704 | * and clear HAMMER_INODE_REDO. This will cause the next |
| 705 | * fsync() to do a full meta-data sync instead of just an |
| 706 | * UNDO/REDO fifo update. |
| 707 | * |
| 708 | * When clearing HAMMER_INODE_REDO any pre-existing REDOs |
| 709 | * will still be tracked. The tracks will be terminated |
| 710 | * when the related meta-data (including possible data |
| 711 | * modifications which are not tracked via REDO) is |
| 712 | * flushed. |
| 713 | */ |
| 714 | if ((ip->flags & HAMMER_INODE_REDO) && error == 0) { |
| 715 | if (ip->redo_count < hammer_limit_redo) { |
| 716 | bp->b_flags |= B_VFSFLAG1; |
| 717 | error = hammer_generate_redo(&trans, ip, |
| 718 | base_offset + offset, |
| 719 | HAMMER_REDO_WRITE, |
| 720 | bp->b_data + offset, |
| 721 | (size_t)n); |
| 722 | } else { |
| 723 | ip->flags &= ~HAMMER_INODE_REDO; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * If we screwed up we have to undo any VM size changes we |
| 729 | * made. |
| 730 | */ |
| 731 | if (error) { |
| 732 | brelse(bp); |
| 733 | if (fixsize) { |
| 734 | nvtruncbuf(ap->a_vp, ip->ino_data.size, |
| 735 | hammer_blocksize(ip->ino_data.size), |
| 736 | hammer_blockoff(ip->ino_data.size)); |
| 737 | } |
| 738 | break; |
| 739 | } |
| 740 | kflags |= NOTE_WRITE; |
| 741 | hammer_stats_file_write += n; |
| 742 | /* bp->b_flags |= B_CLUSTEROK; temporarily disabled */ |
| 743 | if (ip->ino_data.size < uio->uio_offset) { |
| 744 | ip->ino_data.size = uio->uio_offset; |
| 745 | flags = HAMMER_INODE_SDIRTY; |
| 746 | } else { |
| 747 | flags = 0; |
| 748 | } |
| 749 | ip->ino_data.mtime = trans.time; |
| 750 | flags |= HAMMER_INODE_MTIME | HAMMER_INODE_BUFS; |
| 751 | hammer_modify_inode(&trans, ip, flags); |
| 752 | |
| 753 | /* |
| 754 | * Once we dirty the buffer any cached zone-X offset |
| 755 | * becomes invalid. HAMMER NOTE: no-history mode cannot |
| 756 | * allow overwriting over the same data sector unless |
| 757 | * we provide UNDOs for the old data, which we don't. |
| 758 | */ |
| 759 | bp->b_bio2.bio_offset = NOOFFSET; |
| 760 | |
| 761 | /* |
| 762 | * Final buffer disposition. |
| 763 | * |
| 764 | * Because meta-data updates are deferred, HAMMER is |
| 765 | * especially sensitive to excessive bdwrite()s because |
| 766 | * the I/O stream is not broken up by disk reads. So the |
| 767 | * buffer cache simply cannot keep up. |
| 768 | * |
| 769 | * WARNING! blksize is variable. cluster_write() is |
| 770 | * expected to not blow up if it encounters |
| 771 | * buffers that do not match the passed blksize. |
| 772 | * |
| 773 | * NOTE! Hammer shouldn't need to bawrite()/cluster_write(). |
| 774 | * The ip->rsv_recs check should burst-flush the data. |
| 775 | * If we queue it immediately the buf could be left |
| 776 | * locked on the device queue for a very long time. |
| 777 | * |
| 778 | * NOTE! To avoid degenerate stalls due to mismatched block |
| 779 | * sizes we only honor IO_DIRECT on the write which |
| 780 | * abuts the end of the buffer. However, we must |
| 781 | * honor IO_SYNC in case someone is silly enough to |
| 782 | * configure a HAMMER file as swap, or when HAMMER |
| 783 | * is serving NFS (for commits). Ick ick. |
| 784 | */ |
| 785 | bp->b_flags |= B_AGE; |
| 786 | if (ap->a_ioflag & IO_SYNC) { |
| 787 | bwrite(bp); |
| 788 | } else if ((ap->a_ioflag & IO_DIRECT) && endofblk) { |
| 789 | bawrite(bp); |
| 790 | } else { |
| 791 | #if 0 |
| 792 | if (offset + n == blksize) { |
| 793 | if (hammer_cluster_enable == 0 || |
| 794 | (ap->a_vp->v_mount->mnt_flag & MNT_NOCLUSTERW)) { |
| 795 | bawrite(bp); |
| 796 | } else { |
| 797 | cluster_write(bp, ip->ino_data.size, |
| 798 | blksize, seqcount); |
| 799 | } |
| 800 | } else { |
| 801 | #endif |
| 802 | bdwrite(bp); |
| 803 | } |
| 804 | } |
| 805 | hammer_done_transaction(&trans); |
| 806 | hammer_knote(ap->a_vp, kflags); |
| 807 | return (error); |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | * hammer_vop_access { vp, mode, cred } |
| 812 | */ |
| 813 | static |
| 814 | int |
| 815 | hammer_vop_access(struct vop_access_args *ap) |
| 816 | { |
| 817 | struct hammer_inode *ip = VTOI(ap->a_vp); |
| 818 | uid_t uid; |
| 819 | gid_t gid; |
| 820 | int error; |
| 821 | |
| 822 | ++hammer_stats_file_iopsr; |
| 823 | uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 824 | gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 825 | |
| 826 | error = vop_helper_access(ap, uid, gid, ip->ino_data.mode, |
| 827 | ip->ino_data.uflags); |
| 828 | return (error); |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * hammer_vop_advlock { vp, id, op, fl, flags } |
| 833 | */ |
| 834 | static |
| 835 | int |
| 836 | hammer_vop_advlock(struct vop_advlock_args *ap) |
| 837 | { |
| 838 | hammer_inode_t ip = VTOI(ap->a_vp); |
| 839 | |
| 840 | return (lf_advlock(ap, &ip->advlock, ip->ino_data.size)); |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * hammer_vop_close { vp, fflag } |
| 845 | * |
| 846 | * We can only sync-on-close for normal closes. |
| 847 | */ |
| 848 | static |
| 849 | int |
| 850 | hammer_vop_close(struct vop_close_args *ap) |
| 851 | { |
| 852 | #if 0 |
| 853 | struct vnode *vp = ap->a_vp; |
| 854 | hammer_inode_t ip = VTOI(vp); |
| 855 | int waitfor; |
| 856 | if (ip->flags & (HAMMER_INODE_CLOSESYNC|HAMMER_INODE_CLOSEASYNC)) { |
| 857 | if (vn_islocked(vp) == LK_EXCLUSIVE && |
| 858 | (vp->v_flag & (VINACTIVE|VRECLAIMED)) == 0) { |
| 859 | if (ip->flags & HAMMER_INODE_CLOSESYNC) |
| 860 | waitfor = MNT_WAIT; |
| 861 | else |
| 862 | waitfor = MNT_NOWAIT; |
| 863 | ip->flags &= ~(HAMMER_INODE_CLOSESYNC | |
| 864 | HAMMER_INODE_CLOSEASYNC); |
| 865 | VOP_FSYNC(vp, MNT_NOWAIT, waitfor); |
| 866 | } |
| 867 | } |
| 868 | #endif |
| 869 | return (vop_stdclose(ap)); |
| 870 | } |
| 871 | |
| 872 | /* |
| 873 | * hammer_vop_ncreate { nch, dvp, vpp, cred, vap } |
| 874 | * |
| 875 | * The operating system has already ensured that the directory entry |
| 876 | * does not exist and done all appropriate namespace locking. |
| 877 | */ |
| 878 | static |
| 879 | int |
| 880 | hammer_vop_ncreate(struct vop_ncreate_args *ap) |
| 881 | { |
| 882 | struct hammer_transaction trans; |
| 883 | struct hammer_inode *dip; |
| 884 | struct hammer_inode *nip; |
| 885 | struct nchandle *nch; |
| 886 | int error; |
| 887 | |
| 888 | nch = ap->a_nch; |
| 889 | dip = VTOI(ap->a_dvp); |
| 890 | |
| 891 | if (dip->flags & HAMMER_INODE_RO) |
| 892 | return (EROFS); |
| 893 | if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 894 | return (error); |
| 895 | |
| 896 | /* |
| 897 | * Create a transaction to cover the operations we perform. |
| 898 | */ |
| 899 | hammer_start_transaction(&trans, dip->hmp); |
| 900 | ++hammer_stats_file_iopsw; |
| 901 | |
| 902 | /* |
| 903 | * Create a new filesystem object of the requested type. The |
| 904 | * returned inode will be referenced and shared-locked to prevent |
| 905 | * it from being moved to the flusher. |
| 906 | */ |
| 907 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 908 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 909 | NULL, &nip); |
| 910 | if (error) { |
| 911 | hkprintf("hammer_create_inode error %d\n", error); |
| 912 | hammer_done_transaction(&trans); |
| 913 | *ap->a_vpp = NULL; |
| 914 | return (error); |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * Add the new filesystem object to the directory. This will also |
| 919 | * bump the inode's link count. |
| 920 | */ |
| 921 | error = hammer_ip_add_directory(&trans, dip, |
| 922 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 923 | nip); |
| 924 | if (error) |
| 925 | hkprintf("hammer_ip_add_directory error %d\n", error); |
| 926 | |
| 927 | /* |
| 928 | * Finish up. |
| 929 | */ |
| 930 | if (error) { |
| 931 | hammer_rel_inode(nip, 0); |
| 932 | hammer_done_transaction(&trans); |
| 933 | *ap->a_vpp = NULL; |
| 934 | } else { |
| 935 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 936 | hammer_done_transaction(&trans); |
| 937 | hammer_rel_inode(nip, 0); |
| 938 | if (error == 0) { |
| 939 | cache_setunresolved(ap->a_nch); |
| 940 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 941 | } |
| 942 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 943 | } |
| 944 | return (error); |
| 945 | } |
| 946 | |
| 947 | /* |
| 948 | * hammer_vop_getattr { vp, vap } |
| 949 | * |
| 950 | * Retrieve an inode's attribute information. When accessing inodes |
| 951 | * historically we fake the atime field to ensure consistent results. |
| 952 | * The atime field is stored in the B-Tree element and allowed to be |
| 953 | * updated without cycling the element. |
| 954 | * |
| 955 | * MPSAFE |
| 956 | */ |
| 957 | static |
| 958 | int |
| 959 | hammer_vop_getattr(struct vop_getattr_args *ap) |
| 960 | { |
| 961 | struct hammer_inode *ip = VTOI(ap->a_vp); |
| 962 | struct vattr *vap = ap->a_vap; |
| 963 | |
| 964 | /* |
| 965 | * We want the fsid to be different when accessing a filesystem |
| 966 | * with different as-of's so programs like diff don't think |
| 967 | * the files are the same. |
| 968 | * |
| 969 | * We also want the fsid to be the same when comparing snapshots, |
| 970 | * or when comparing mirrors (which might be backed by different |
| 971 | * physical devices). HAMMER fsids are based on the PFS's |
| 972 | * shared_uuid field. |
| 973 | * |
| 974 | * XXX there is a chance of collision here. The va_fsid reported |
| 975 | * by stat is different from the more involved fsid used in the |
| 976 | * mount structure. |
| 977 | */ |
| 978 | ++hammer_stats_file_iopsr; |
| 979 | hammer_lock_sh(&ip->lock); |
| 980 | vap->va_fsid = ip->pfsm->fsid_udev ^ (u_int32_t)ip->obj_asof ^ |
| 981 | (u_int32_t)(ip->obj_asof >> 32); |
| 982 | |
| 983 | vap->va_fileid = ip->ino_leaf.base.obj_id; |
| 984 | vap->va_mode = ip->ino_data.mode; |
| 985 | vap->va_nlink = ip->ino_data.nlinks; |
| 986 | vap->va_uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 987 | vap->va_gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 988 | vap->va_rmajor = 0; |
| 989 | vap->va_rminor = 0; |
| 990 | vap->va_size = ip->ino_data.size; |
| 991 | |
| 992 | /* |
| 993 | * Special case for @@PFS softlinks. The actual size of the |
| 994 | * expanded softlink is "@@0x%016llx:%05d" == 26 bytes. |
| 995 | * or for MAX_TID is "@@-1:%05d" == 10 bytes. |
| 996 | */ |
| 997 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_SOFTLINK && |
| 998 | ip->ino_data.size == 10 && |
| 999 | ip->obj_asof == HAMMER_MAX_TID && |
| 1000 | ip->obj_localization == 0 && |
| 1001 | strncmp(ip->ino_data.ext.symlink, "@@PFS", 5) == 0) { |
| 1002 | if (ip->pfsm->pfsd.mirror_flags & HAMMER_PFSD_SLAVE) |
| 1003 | vap->va_size = 26; |
| 1004 | else |
| 1005 | vap->va_size = 10; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * We must provide a consistent atime and mtime for snapshots |
| 1010 | * so people can do a 'tar cf - ... | md5' on them and get |
| 1011 | * consistent results. |
| 1012 | */ |
| 1013 | if (ip->flags & HAMMER_INODE_RO) { |
| 1014 | hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_atime); |
| 1015 | hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_mtime); |
| 1016 | } else { |
| 1017 | hammer_time_to_timespec(ip->ino_data.atime, &vap->va_atime); |
| 1018 | hammer_time_to_timespec(ip->ino_data.mtime, &vap->va_mtime); |
| 1019 | } |
| 1020 | hammer_time_to_timespec(ip->ino_data.ctime, &vap->va_ctime); |
| 1021 | vap->va_flags = ip->ino_data.uflags; |
| 1022 | vap->va_gen = 1; /* hammer inums are unique for all time */ |
| 1023 | vap->va_blocksize = HAMMER_BUFSIZE; |
| 1024 | if (ip->ino_data.size >= HAMMER_XDEMARC) { |
| 1025 | vap->va_bytes = (ip->ino_data.size + HAMMER_XBUFMASK64) & |
| 1026 | ~HAMMER_XBUFMASK64; |
| 1027 | } else if (ip->ino_data.size > HAMMER_BUFSIZE / 2) { |
| 1028 | vap->va_bytes = (ip->ino_data.size + HAMMER_BUFMASK64) & |
| 1029 | ~HAMMER_BUFMASK64; |
| 1030 | } else { |
| 1031 | vap->va_bytes = (ip->ino_data.size + 15) & ~15; |
| 1032 | } |
| 1033 | |
| 1034 | vap->va_type = hammer_get_vnode_type(ip->ino_data.obj_type); |
| 1035 | vap->va_filerev = 0; /* XXX */ |
| 1036 | vap->va_uid_uuid = ip->ino_data.uid; |
| 1037 | vap->va_gid_uuid = ip->ino_data.gid; |
| 1038 | vap->va_fsid_uuid = ip->hmp->fsid; |
| 1039 | vap->va_vaflags = VA_UID_UUID_VALID | VA_GID_UUID_VALID | |
| 1040 | VA_FSID_UUID_VALID; |
| 1041 | |
| 1042 | switch (ip->ino_data.obj_type) { |
| 1043 | case HAMMER_OBJTYPE_CDEV: |
| 1044 | case HAMMER_OBJTYPE_BDEV: |
| 1045 | vap->va_rmajor = ip->ino_data.rmajor; |
| 1046 | vap->va_rminor = ip->ino_data.rminor; |
| 1047 | break; |
| 1048 | default: |
| 1049 | break; |
| 1050 | } |
| 1051 | hammer_unlock(&ip->lock); |
| 1052 | return(0); |
| 1053 | } |
| 1054 | |
| 1055 | /* |
| 1056 | * hammer_vop_nresolve { nch, dvp, cred } |
| 1057 | * |
| 1058 | * Locate the requested directory entry. |
| 1059 | */ |
| 1060 | static |
| 1061 | int |
| 1062 | hammer_vop_nresolve(struct vop_nresolve_args *ap) |
| 1063 | { |
| 1064 | struct hammer_transaction trans; |
| 1065 | struct namecache *ncp; |
| 1066 | hammer_inode_t dip; |
| 1067 | hammer_inode_t ip; |
| 1068 | hammer_tid_t asof; |
| 1069 | struct hammer_cursor cursor; |
| 1070 | struct vnode *vp; |
| 1071 | int64_t namekey; |
| 1072 | int error; |
| 1073 | int i; |
| 1074 | int nlen; |
| 1075 | int flags; |
| 1076 | int ispfs; |
| 1077 | int64_t obj_id; |
| 1078 | u_int32_t localization; |
| 1079 | u_int32_t max_iterations; |
| 1080 | |
| 1081 | /* |
| 1082 | * Misc initialization, plus handle as-of name extensions. Look for |
| 1083 | * the '@@' extension. Note that as-of files and directories cannot |
| 1084 | * be modified. |
| 1085 | */ |
| 1086 | dip = VTOI(ap->a_dvp); |
| 1087 | ncp = ap->a_nch->ncp; |
| 1088 | asof = dip->obj_asof; |
| 1089 | localization = dip->obj_localization; /* for code consistency */ |
| 1090 | nlen = ncp->nc_nlen; |
| 1091 | flags = dip->flags & HAMMER_INODE_RO; |
| 1092 | ispfs = 0; |
| 1093 | |
| 1094 | hammer_simple_transaction(&trans, dip->hmp); |
| 1095 | ++hammer_stats_file_iopsr; |
| 1096 | |
| 1097 | for (i = 0; i < nlen; ++i) { |
| 1098 | if (ncp->nc_name[i] == '@' && ncp->nc_name[i+1] == '@') { |
| 1099 | error = hammer_str_to_tid(ncp->nc_name + i + 2, |
| 1100 | &ispfs, &asof, &localization); |
| 1101 | if (error != 0) { |
| 1102 | i = nlen; |
| 1103 | break; |
| 1104 | } |
| 1105 | if (asof != HAMMER_MAX_TID) |
| 1106 | flags |= HAMMER_INODE_RO; |
| 1107 | break; |
| 1108 | } |
| 1109 | } |
| 1110 | nlen = i; |
| 1111 | |
| 1112 | /* |
| 1113 | * If this is a PFS softlink we dive into the PFS |
| 1114 | */ |
| 1115 | if (ispfs && nlen == 0) { |
| 1116 | ip = hammer_get_inode(&trans, dip, HAMMER_OBJID_ROOT, |
| 1117 | asof, localization, |
| 1118 | flags, &error); |
| 1119 | if (error == 0) { |
| 1120 | error = hammer_get_vnode(ip, &vp); |
| 1121 | hammer_rel_inode(ip, 0); |
| 1122 | } else { |
| 1123 | vp = NULL; |
| 1124 | } |
| 1125 | if (error == 0) { |
| 1126 | vn_unlock(vp); |
| 1127 | cache_setvp(ap->a_nch, vp); |
| 1128 | vrele(vp); |
| 1129 | } |
| 1130 | goto done; |
| 1131 | } |
| 1132 | |
| 1133 | /* |
| 1134 | * If there is no path component the time extension is relative to dip. |
| 1135 | * e.g. "fubar/@@<snapshot>" |
| 1136 | * |
| 1137 | * "." is handled by the kernel, but ".@@<snapshot>" is not. |
| 1138 | * e.g. "fubar/.@@<snapshot>" |
| 1139 | * |
| 1140 | * ".." is handled by the kernel. We do not currently handle |
| 1141 | * "..@<snapshot>". |
| 1142 | */ |
| 1143 | if (nlen == 0 || (nlen == 1 && ncp->nc_name[0] == '.')) { |
| 1144 | ip = hammer_get_inode(&trans, dip, dip->obj_id, |
| 1145 | asof, dip->obj_localization, |
| 1146 | flags, &error); |
| 1147 | if (error == 0) { |
| 1148 | error = hammer_get_vnode(ip, &vp); |
| 1149 | hammer_rel_inode(ip, 0); |
| 1150 | } else { |
| 1151 | vp = NULL; |
| 1152 | } |
| 1153 | if (error == 0) { |
| 1154 | vn_unlock(vp); |
| 1155 | cache_setvp(ap->a_nch, vp); |
| 1156 | vrele(vp); |
| 1157 | } |
| 1158 | goto done; |
| 1159 | } |
| 1160 | |
| 1161 | /* |
| 1162 | * Calculate the namekey and setup the key range for the scan. This |
| 1163 | * works kinda like a chained hash table where the lower 32 bits |
| 1164 | * of the namekey synthesize the chain. |
| 1165 | * |
| 1166 | * The key range is inclusive of both key_beg and key_end. |
| 1167 | */ |
| 1168 | namekey = hammer_directory_namekey(dip, ncp->nc_name, nlen, |
| 1169 | &max_iterations); |
| 1170 | |
| 1171 | error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip); |
| 1172 | cursor.key_beg.localization = dip->obj_localization + |
| 1173 | hammer_dir_localization(dip); |
| 1174 | cursor.key_beg.obj_id = dip->obj_id; |
| 1175 | cursor.key_beg.key = namekey; |
| 1176 | cursor.key_beg.create_tid = 0; |
| 1177 | cursor.key_beg.delete_tid = 0; |
| 1178 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 1179 | cursor.key_beg.obj_type = 0; |
| 1180 | |
| 1181 | cursor.key_end = cursor.key_beg; |
| 1182 | cursor.key_end.key += max_iterations; |
| 1183 | cursor.asof = asof; |
| 1184 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 1185 | |
| 1186 | /* |
| 1187 | * Scan all matching records (the chain), locate the one matching |
| 1188 | * the requested path component. |
| 1189 | * |
| 1190 | * The hammer_ip_*() functions merge in-memory records with on-disk |
| 1191 | * records for the purposes of the search. |
| 1192 | */ |
| 1193 | obj_id = 0; |
| 1194 | localization = HAMMER_DEF_LOCALIZATION; |
| 1195 | |
| 1196 | if (error == 0) { |
| 1197 | error = hammer_ip_first(&cursor); |
| 1198 | while (error == 0) { |
| 1199 | error = hammer_ip_resolve_data(&cursor); |
| 1200 | if (error) |
| 1201 | break; |
| 1202 | if (nlen == cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF && |
| 1203 | bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { |
| 1204 | obj_id = cursor.data->entry.obj_id; |
| 1205 | localization = cursor.data->entry.localization; |
| 1206 | break; |
| 1207 | } |
| 1208 | error = hammer_ip_next(&cursor); |
| 1209 | } |
| 1210 | } |
| 1211 | hammer_done_cursor(&cursor); |
| 1212 | |
| 1213 | /* |
| 1214 | * Lookup the obj_id. This should always succeed. If it does not |
| 1215 | * the filesystem may be damaged and we return a dummy inode. |
| 1216 | */ |
| 1217 | if (error == 0) { |
| 1218 | ip = hammer_get_inode(&trans, dip, obj_id, |
| 1219 | asof, localization, |
| 1220 | flags, &error); |
| 1221 | if (error == ENOENT) { |
| 1222 | kprintf("HAMMER: WARNING: Missing " |
| 1223 | "inode for dirent \"%s\"\n" |
| 1224 | "\tobj_id = %016llx, asof=%016llx, lo=%08x\n", |
| 1225 | ncp->nc_name, |
| 1226 | (long long)obj_id, (long long)asof, |
| 1227 | localization); |
| 1228 | error = 0; |
| 1229 | ip = hammer_get_dummy_inode(&trans, dip, obj_id, |
| 1230 | asof, localization, |
| 1231 | flags, &error); |
| 1232 | } |
| 1233 | if (error == 0) { |
| 1234 | error = hammer_get_vnode(ip, &vp); |
| 1235 | hammer_rel_inode(ip, 0); |
| 1236 | } else { |
| 1237 | vp = NULL; |
| 1238 | } |
| 1239 | if (error == 0) { |
| 1240 | vn_unlock(vp); |
| 1241 | cache_setvp(ap->a_nch, vp); |
| 1242 | vrele(vp); |
| 1243 | } |
| 1244 | } else if (error == ENOENT) { |
| 1245 | cache_setvp(ap->a_nch, NULL); |
| 1246 | } |
| 1247 | done: |
| 1248 | hammer_done_transaction(&trans); |
| 1249 | return (error); |
| 1250 | } |
| 1251 | |
| 1252 | /* |
| 1253 | * hammer_vop_nlookupdotdot { dvp, vpp, cred } |
| 1254 | * |
| 1255 | * Locate the parent directory of a directory vnode. |
| 1256 | * |
| 1257 | * dvp is referenced but not locked. *vpp must be returned referenced and |
| 1258 | * locked. A parent_obj_id of 0 does not necessarily indicate that we are |
| 1259 | * at the root, instead it could indicate that the directory we were in was |
| 1260 | * removed. |
| 1261 | * |
| 1262 | * NOTE: as-of sequences are not linked into the directory structure. If |
| 1263 | * we are at the root with a different asof then the mount point, reload |
| 1264 | * the same directory with the mount point's asof. I'm not sure what this |
| 1265 | * will do to NFS. We encode ASOF stamps in NFS file handles so it might not |
| 1266 | * get confused, but it hasn't been tested. |
| 1267 | */ |
| 1268 | static |
| 1269 | int |
| 1270 | hammer_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap) |
| 1271 | { |
| 1272 | struct hammer_transaction trans; |
| 1273 | struct hammer_inode *dip; |
| 1274 | struct hammer_inode *ip; |
| 1275 | int64_t parent_obj_id; |
| 1276 | u_int32_t parent_obj_localization; |
| 1277 | hammer_tid_t asof; |
| 1278 | int error; |
| 1279 | |
| 1280 | dip = VTOI(ap->a_dvp); |
| 1281 | asof = dip->obj_asof; |
| 1282 | |
| 1283 | /* |
| 1284 | * Whos are parent? This could be the root of a pseudo-filesystem |
| 1285 | * whos parent is in another localization domain. |
| 1286 | */ |
| 1287 | parent_obj_id = dip->ino_data.parent_obj_id; |
| 1288 | if (dip->obj_id == HAMMER_OBJID_ROOT) |
| 1289 | parent_obj_localization = dip->ino_data.ext.obj.parent_obj_localization; |
| 1290 | else |
| 1291 | parent_obj_localization = dip->obj_localization; |
| 1292 | |
| 1293 | if (parent_obj_id == 0) { |
| 1294 | if (dip->obj_id == HAMMER_OBJID_ROOT && |
| 1295 | asof != dip->hmp->asof) { |
| 1296 | parent_obj_id = dip->obj_id; |
| 1297 | asof = dip->hmp->asof; |
| 1298 | *ap->a_fakename = kmalloc(19, M_TEMP, M_WAITOK); |
| 1299 | ksnprintf(*ap->a_fakename, 19, "0x%016llx", |
| 1300 | (long long)dip->obj_asof); |
| 1301 | } else { |
| 1302 | *ap->a_vpp = NULL; |
| 1303 | return ENOENT; |
| 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | hammer_simple_transaction(&trans, dip->hmp); |
| 1308 | ++hammer_stats_file_iopsr; |
| 1309 | |
| 1310 | ip = hammer_get_inode(&trans, dip, parent_obj_id, |
| 1311 | asof, parent_obj_localization, |
| 1312 | dip->flags, &error); |
| 1313 | if (ip) { |
| 1314 | error = hammer_get_vnode(ip, ap->a_vpp); |
| 1315 | hammer_rel_inode(ip, 0); |
| 1316 | } else { |
| 1317 | *ap->a_vpp = NULL; |
| 1318 | } |
| 1319 | hammer_done_transaction(&trans); |
| 1320 | return (error); |
| 1321 | } |
| 1322 | |
| 1323 | /* |
| 1324 | * hammer_vop_nlink { nch, dvp, vp, cred } |
| 1325 | */ |
| 1326 | static |
| 1327 | int |
| 1328 | hammer_vop_nlink(struct vop_nlink_args *ap) |
| 1329 | { |
| 1330 | struct hammer_transaction trans; |
| 1331 | struct hammer_inode *dip; |
| 1332 | struct hammer_inode *ip; |
| 1333 | struct nchandle *nch; |
| 1334 | int error; |
| 1335 | |
| 1336 | if (ap->a_dvp->v_mount != ap->a_vp->v_mount) |
| 1337 | return(EXDEV); |
| 1338 | |
| 1339 | nch = ap->a_nch; |
| 1340 | dip = VTOI(ap->a_dvp); |
| 1341 | ip = VTOI(ap->a_vp); |
| 1342 | |
| 1343 | if (dip->obj_localization != ip->obj_localization) |
| 1344 | return(EXDEV); |
| 1345 | |
| 1346 | if (dip->flags & HAMMER_INODE_RO) |
| 1347 | return (EROFS); |
| 1348 | if (ip->flags & HAMMER_INODE_RO) |
| 1349 | return (EROFS); |
| 1350 | if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1351 | return (error); |
| 1352 | |
| 1353 | /* |
| 1354 | * Create a transaction to cover the operations we perform. |
| 1355 | */ |
| 1356 | hammer_start_transaction(&trans, dip->hmp); |
| 1357 | ++hammer_stats_file_iopsw; |
| 1358 | |
| 1359 | /* |
| 1360 | * Add the filesystem object to the directory. Note that neither |
| 1361 | * dip nor ip are referenced or locked, but their vnodes are |
| 1362 | * referenced. This function will bump the inode's link count. |
| 1363 | */ |
| 1364 | error = hammer_ip_add_directory(&trans, dip, |
| 1365 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1366 | ip); |
| 1367 | |
| 1368 | /* |
| 1369 | * Finish up. |
| 1370 | */ |
| 1371 | if (error == 0) { |
| 1372 | cache_setunresolved(nch); |
| 1373 | cache_setvp(nch, ap->a_vp); |
| 1374 | } |
| 1375 | hammer_done_transaction(&trans); |
| 1376 | hammer_knote(ap->a_vp, NOTE_LINK); |
| 1377 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 1378 | return (error); |
| 1379 | } |
| 1380 | |
| 1381 | /* |
| 1382 | * hammer_vop_nmkdir { nch, dvp, vpp, cred, vap } |
| 1383 | * |
| 1384 | * The operating system has already ensured that the directory entry |
| 1385 | * does not exist and done all appropriate namespace locking. |
| 1386 | */ |
| 1387 | static |
| 1388 | int |
| 1389 | hammer_vop_nmkdir(struct vop_nmkdir_args *ap) |
| 1390 | { |
| 1391 | struct hammer_transaction trans; |
| 1392 | struct hammer_inode *dip; |
| 1393 | struct hammer_inode *nip; |
| 1394 | struct nchandle *nch; |
| 1395 | int error; |
| 1396 | |
| 1397 | nch = ap->a_nch; |
| 1398 | dip = VTOI(ap->a_dvp); |
| 1399 | |
| 1400 | if (dip->flags & HAMMER_INODE_RO) |
| 1401 | return (EROFS); |
| 1402 | if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1403 | return (error); |
| 1404 | |
| 1405 | /* |
| 1406 | * Create a transaction to cover the operations we perform. |
| 1407 | */ |
| 1408 | hammer_start_transaction(&trans, dip->hmp); |
| 1409 | ++hammer_stats_file_iopsw; |
| 1410 | |
| 1411 | /* |
| 1412 | * Create a new filesystem object of the requested type. The |
| 1413 | * returned inode will be referenced but not locked. |
| 1414 | */ |
| 1415 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 1416 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1417 | NULL, &nip); |
| 1418 | if (error) { |
| 1419 | hkprintf("hammer_mkdir error %d\n", error); |
| 1420 | hammer_done_transaction(&trans); |
| 1421 | *ap->a_vpp = NULL; |
| 1422 | return (error); |
| 1423 | } |
| 1424 | /* |
| 1425 | * Add the new filesystem object to the directory. This will also |
| 1426 | * bump the inode's link count. |
| 1427 | */ |
| 1428 | error = hammer_ip_add_directory(&trans, dip, |
| 1429 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1430 | nip); |
| 1431 | if (error) |
| 1432 | hkprintf("hammer_mkdir (add) error %d\n", error); |
| 1433 | |
| 1434 | /* |
| 1435 | * Finish up. |
| 1436 | */ |
| 1437 | if (error) { |
| 1438 | hammer_rel_inode(nip, 0); |
| 1439 | *ap->a_vpp = NULL; |
| 1440 | } else { |
| 1441 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 1442 | hammer_rel_inode(nip, 0); |
| 1443 | if (error == 0) { |
| 1444 | cache_setunresolved(ap->a_nch); |
| 1445 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 1446 | } |
| 1447 | } |
| 1448 | hammer_done_transaction(&trans); |
| 1449 | if (error == 0) |
| 1450 | hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); |
| 1451 | return (error); |
| 1452 | } |
| 1453 | |
| 1454 | /* |
| 1455 | * hammer_vop_nmknod { nch, dvp, vpp, cred, vap } |
| 1456 | * |
| 1457 | * The operating system has already ensured that the directory entry |
| 1458 | * does not exist and done all appropriate namespace locking. |
| 1459 | */ |
| 1460 | static |
| 1461 | int |
| 1462 | hammer_vop_nmknod(struct vop_nmknod_args *ap) |
| 1463 | { |
| 1464 | struct hammer_transaction trans; |
| 1465 | struct hammer_inode *dip; |
| 1466 | struct hammer_inode *nip; |
| 1467 | struct nchandle *nch; |
| 1468 | int error; |
| 1469 | |
| 1470 | nch = ap->a_nch; |
| 1471 | dip = VTOI(ap->a_dvp); |
| 1472 | |
| 1473 | if (dip->flags & HAMMER_INODE_RO) |
| 1474 | return (EROFS); |
| 1475 | if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1476 | return (error); |
| 1477 | |
| 1478 | /* |
| 1479 | * Create a transaction to cover the operations we perform. |
| 1480 | */ |
| 1481 | hammer_start_transaction(&trans, dip->hmp); |
| 1482 | ++hammer_stats_file_iopsw; |
| 1483 | |
| 1484 | /* |
| 1485 | * Create a new filesystem object of the requested type. The |
| 1486 | * returned inode will be referenced but not locked. |
| 1487 | * |
| 1488 | * If mknod specifies a directory a pseudo-fs is created. |
| 1489 | */ |
| 1490 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 1491 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1492 | NULL, &nip); |
| 1493 | if (error) { |
| 1494 | hammer_done_transaction(&trans); |
| 1495 | *ap->a_vpp = NULL; |
| 1496 | return (error); |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | * Add the new filesystem object to the directory. This will also |
| 1501 | * bump the inode's link count. |
| 1502 | */ |
| 1503 | error = hammer_ip_add_directory(&trans, dip, |
| 1504 | nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 1505 | nip); |
| 1506 | |
| 1507 | /* |
| 1508 | * Finish up. |
| 1509 | */ |
| 1510 | if (error) { |
| 1511 | hammer_rel_inode(nip, 0); |
| 1512 | *ap->a_vpp = NULL; |
| 1513 | } else { |
| 1514 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 1515 | hammer_rel_inode(nip, 0); |
| 1516 | if (error == 0) { |
| 1517 | cache_setunresolved(ap->a_nch); |
| 1518 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 1519 | } |
| 1520 | } |
| 1521 | hammer_done_transaction(&trans); |
| 1522 | if (error == 0) |
| 1523 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 1524 | return (error); |
| 1525 | } |
| 1526 | |
| 1527 | /* |
| 1528 | * hammer_vop_open { vp, mode, cred, fp } |
| 1529 | */ |
| 1530 | static |
| 1531 | int |
| 1532 | hammer_vop_open(struct vop_open_args *ap) |
| 1533 | { |
| 1534 | hammer_inode_t ip; |
| 1535 | |
| 1536 | ++hammer_stats_file_iopsr; |
| 1537 | ip = VTOI(ap->a_vp); |
| 1538 | |
| 1539 | if ((ap->a_mode & FWRITE) && (ip->flags & HAMMER_INODE_RO)) |
| 1540 | return (EROFS); |
| 1541 | return(vop_stdopen(ap)); |
| 1542 | } |
| 1543 | |
| 1544 | /* |
| 1545 | * hammer_vop_print { vp } |
| 1546 | */ |
| 1547 | static |
| 1548 | int |
| 1549 | hammer_vop_print(struct vop_print_args *ap) |
| 1550 | { |
| 1551 | return EOPNOTSUPP; |
| 1552 | } |
| 1553 | |
| 1554 | /* |
| 1555 | * hammer_vop_readdir { vp, uio, cred, *eofflag, *ncookies, off_t **cookies } |
| 1556 | */ |
| 1557 | static |
| 1558 | int |
| 1559 | hammer_vop_readdir(struct vop_readdir_args *ap) |
| 1560 | { |
| 1561 | struct hammer_transaction trans; |
| 1562 | struct hammer_cursor cursor; |
| 1563 | struct hammer_inode *ip; |
| 1564 | struct uio *uio; |
| 1565 | hammer_base_elm_t base; |
| 1566 | int error; |
| 1567 | int cookie_index; |
| 1568 | int ncookies; |
| 1569 | off_t *cookies; |
| 1570 | off_t saveoff; |
| 1571 | int r; |
| 1572 | int dtype; |
| 1573 | |
| 1574 | ++hammer_stats_file_iopsr; |
| 1575 | ip = VTOI(ap->a_vp); |
| 1576 | uio = ap->a_uio; |
| 1577 | saveoff = uio->uio_offset; |
| 1578 | |
| 1579 | if (ap->a_ncookies) { |
| 1580 | ncookies = uio->uio_resid / 16 + 1; |
| 1581 | if (ncookies > 1024) |
| 1582 | ncookies = 1024; |
| 1583 | cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); |
| 1584 | cookie_index = 0; |
| 1585 | } else { |
| 1586 | ncookies = -1; |
| 1587 | cookies = NULL; |
| 1588 | cookie_index = 0; |
| 1589 | } |
| 1590 | |
| 1591 | hammer_simple_transaction(&trans, ip->hmp); |
| 1592 | |
| 1593 | /* |
| 1594 | * Handle artificial entries |
| 1595 | * |
| 1596 | * It should be noted that the minimum value for a directory |
| 1597 | * hash key on-media is 0x0000000100000000, so we can use anything |
| 1598 | * less then that to represent our 'special' key space. |
| 1599 | */ |
| 1600 | error = 0; |
| 1601 | if (saveoff == 0) { |
| 1602 | r = vop_write_dirent(&error, uio, ip->obj_id, DT_DIR, 1, "."); |
| 1603 | if (r) |
| 1604 | goto done; |
| 1605 | if (cookies) |
| 1606 | cookies[cookie_index] = saveoff; |
| 1607 | ++saveoff; |
| 1608 | ++cookie_index; |
| 1609 | if (cookie_index == ncookies) |
| 1610 | goto done; |
| 1611 | } |
| 1612 | if (saveoff == 1) { |
| 1613 | if (ip->ino_data.parent_obj_id) { |
| 1614 | r = vop_write_dirent(&error, uio, |
| 1615 | ip->ino_data.parent_obj_id, |
| 1616 | DT_DIR, 2, ".."); |
| 1617 | } else { |
| 1618 | r = vop_write_dirent(&error, uio, |
| 1619 | ip->obj_id, DT_DIR, 2, ".."); |
| 1620 | } |
| 1621 | if (r) |
| 1622 | goto done; |
| 1623 | if (cookies) |
| 1624 | cookies[cookie_index] = saveoff; |
| 1625 | ++saveoff; |
| 1626 | ++cookie_index; |
| 1627 | if (cookie_index == ncookies) |
| 1628 | goto done; |
| 1629 | } |
| 1630 | |
| 1631 | /* |
| 1632 | * Key range (begin and end inclusive) to scan. Directory keys |
| 1633 | * directly translate to a 64 bit 'seek' position. |
| 1634 | */ |
| 1635 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 1636 | cursor.key_beg.localization = ip->obj_localization + |
| 1637 | hammer_dir_localization(ip); |
| 1638 | cursor.key_beg.obj_id = ip->obj_id; |
| 1639 | cursor.key_beg.create_tid = 0; |
| 1640 | cursor.key_beg.delete_tid = 0; |
| 1641 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 1642 | cursor.key_beg.obj_type = 0; |
| 1643 | cursor.key_beg.key = saveoff; |
| 1644 | |
| 1645 | cursor.key_end = cursor.key_beg; |
| 1646 | cursor.key_end.key = HAMMER_MAX_KEY; |
| 1647 | cursor.asof = ip->obj_asof; |
| 1648 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 1649 | |
| 1650 | error = hammer_ip_first(&cursor); |
| 1651 | |
| 1652 | while (error == 0) { |
| 1653 | error = hammer_ip_resolve_data(&cursor); |
| 1654 | if (error) |
| 1655 | break; |
| 1656 | base = &cursor.leaf->base; |
| 1657 | saveoff = base->key; |
| 1658 | KKASSERT(cursor.leaf->data_len > HAMMER_ENTRY_NAME_OFF); |
| 1659 | |
| 1660 | if (base->obj_id != ip->obj_id) |
| 1661 | panic("readdir: bad record at %p", cursor.node); |
| 1662 | |
| 1663 | /* |
| 1664 | * Convert pseudo-filesystems into softlinks |
| 1665 | */ |
| 1666 | dtype = hammer_get_dtype(cursor.leaf->base.obj_type); |
| 1667 | r = vop_write_dirent( |
| 1668 | &error, uio, cursor.data->entry.obj_id, |
| 1669 | dtype, |
| 1670 | cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF , |
| 1671 | (void *)cursor.data->entry.name); |
| 1672 | if (r) |
| 1673 | break; |
| 1674 | ++saveoff; |
| 1675 | if (cookies) |
| 1676 | cookies[cookie_index] = base->key; |
| 1677 | ++cookie_index; |
| 1678 | if (cookie_index == ncookies) |
| 1679 | break; |
| 1680 | error = hammer_ip_next(&cursor); |
| 1681 | } |
| 1682 | hammer_done_cursor(&cursor); |
| 1683 | |
| 1684 | done: |
| 1685 | hammer_done_transaction(&trans); |
| 1686 | |
| 1687 | if (ap->a_eofflag) |
| 1688 | *ap->a_eofflag = (error == ENOENT); |
| 1689 | uio->uio_offset = saveoff; |
| 1690 | if (error && cookie_index == 0) { |
| 1691 | if (error == ENOENT) |
| 1692 | error = 0; |
| 1693 | if (cookies) { |
| 1694 | kfree(cookies, M_TEMP); |
| 1695 | *ap->a_ncookies = 0; |
| 1696 | *ap->a_cookies = NULL; |
| 1697 | } |
| 1698 | } else { |
| 1699 | if (error == ENOENT) |
| 1700 | error = 0; |
| 1701 | if (cookies) { |
| 1702 | *ap->a_ncookies = cookie_index; |
| 1703 | *ap->a_cookies = cookies; |
| 1704 | } |
| 1705 | } |
| 1706 | return(error); |
| 1707 | } |
| 1708 | |
| 1709 | /* |
| 1710 | * hammer_vop_readlink { vp, uio, cred } |
| 1711 | */ |
| 1712 | static |
| 1713 | int |
| 1714 | hammer_vop_readlink(struct vop_readlink_args *ap) |
| 1715 | { |
| 1716 | struct hammer_transaction trans; |
| 1717 | struct hammer_cursor cursor; |
| 1718 | struct hammer_inode *ip; |
| 1719 | char buf[32]; |
| 1720 | u_int32_t localization; |
| 1721 | hammer_pseudofs_inmem_t pfsm; |
| 1722 | int error; |
| 1723 | |
| 1724 | ip = VTOI(ap->a_vp); |
| 1725 | |
| 1726 | /* |
| 1727 | * Shortcut if the symlink data was stuffed into ino_data. |
| 1728 | * |
| 1729 | * Also expand special "@@PFS%05d" softlinks (expansion only |
| 1730 | * occurs for non-historical (current) accesses made from the |
| 1731 | * primary filesystem). |
| 1732 | */ |
| 1733 | if (ip->ino_data.size <= HAMMER_INODE_BASESYMLEN) { |
| 1734 | char *ptr; |
| 1735 | int bytes; |
| 1736 | |
| 1737 | ptr = ip->ino_data.ext.symlink; |
| 1738 | bytes = (int)ip->ino_data.size; |
| 1739 | if (bytes == 10 && |
| 1740 | ip->obj_asof == HAMMER_MAX_TID && |
| 1741 | ip->obj_localization == 0 && |
| 1742 | strncmp(ptr, "@@PFS", 5) == 0) { |
| 1743 | hammer_simple_transaction(&trans, ip->hmp); |
| 1744 | bcopy(ptr + 5, buf, 5); |
| 1745 | buf[5] = 0; |
| 1746 | localization = strtoul(buf, NULL, 10) << 16; |
| 1747 | pfsm = hammer_load_pseudofs(&trans, localization, |
| 1748 | &error); |
| 1749 | if (error == 0) { |
| 1750 | if (pfsm->pfsd.mirror_flags & |
| 1751 | HAMMER_PFSD_SLAVE) { |
| 1752 | /* vap->va_size == 26 */ |
| 1753 | ksnprintf(buf, sizeof(buf), |
| 1754 | "@@0x%016llx:%05d", |
| 1755 | (long long)pfsm->pfsd.sync_end_tid, |
| 1756 | localization >> 16); |
| 1757 | } else { |
| 1758 | /* vap->va_size == 10 */ |
| 1759 | ksnprintf(buf, sizeof(buf), |
| 1760 | "@@-1:%05d", |
| 1761 | localization >> 16); |
| 1762 | #if 0 |
| 1763 | ksnprintf(buf, sizeof(buf), |
| 1764 | "@@0x%016llx:%05d", |
| 1765 | (long long)HAMMER_MAX_TID, |
| 1766 | localization >> 16); |
| 1767 | #endif |
| 1768 | } |
| 1769 | ptr = buf; |
| 1770 | bytes = strlen(buf); |
| 1771 | } |
| 1772 | if (pfsm) |
| 1773 | hammer_rel_pseudofs(trans.hmp, pfsm); |
| 1774 | hammer_done_transaction(&trans); |
| 1775 | } |
| 1776 | error = uiomove(ptr, bytes, ap->a_uio); |
| 1777 | return(error); |
| 1778 | } |
| 1779 | |
| 1780 | /* |
| 1781 | * Long version |
| 1782 | */ |
| 1783 | hammer_simple_transaction(&trans, ip->hmp); |
| 1784 | ++hammer_stats_file_iopsr; |
| 1785 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 1786 | |
| 1787 | /* |
| 1788 | * Key range (begin and end inclusive) to scan. Directory keys |
| 1789 | * directly translate to a 64 bit 'seek' position. |
| 1790 | */ |
| 1791 | cursor.key_beg.localization = ip->obj_localization + |
| 1792 | HAMMER_LOCALIZE_MISC; |
| 1793 | cursor.key_beg.obj_id = ip->obj_id; |
| 1794 | cursor.key_beg.create_tid = 0; |
| 1795 | cursor.key_beg.delete_tid = 0; |
| 1796 | cursor.key_beg.rec_type = HAMMER_RECTYPE_FIX; |
| 1797 | cursor.key_beg.obj_type = 0; |
| 1798 | cursor.key_beg.key = HAMMER_FIXKEY_SYMLINK; |
| 1799 | cursor.asof = ip->obj_asof; |
| 1800 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 1801 | |
| 1802 | error = hammer_ip_lookup(&cursor); |
| 1803 | if (error == 0) { |
| 1804 | error = hammer_ip_resolve_data(&cursor); |
| 1805 | if (error == 0) { |
| 1806 | KKASSERT(cursor.leaf->data_len >= |
| 1807 | HAMMER_SYMLINK_NAME_OFF); |
| 1808 | error = uiomove(cursor.data->symlink.name, |
| 1809 | cursor.leaf->data_len - |
| 1810 | HAMMER_SYMLINK_NAME_OFF, |
| 1811 | ap->a_uio); |
| 1812 | } |
| 1813 | } |
| 1814 | hammer_done_cursor(&cursor); |
| 1815 | hammer_done_transaction(&trans); |
| 1816 | return(error); |
| 1817 | } |
| 1818 | |
| 1819 | /* |
| 1820 | * hammer_vop_nremove { nch, dvp, cred } |
| 1821 | */ |
| 1822 | static |
| 1823 | int |
| 1824 | hammer_vop_nremove(struct vop_nremove_args *ap) |
| 1825 | { |
| 1826 | struct hammer_transaction trans; |
| 1827 | struct hammer_inode *dip; |
| 1828 | int error; |
| 1829 | |
| 1830 | dip = VTOI(ap->a_dvp); |
| 1831 | |
| 1832 | if (hammer_nohistory(dip) == 0 && |
| 1833 | (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { |
| 1834 | return (error); |
| 1835 | } |
| 1836 | |
| 1837 | hammer_start_transaction(&trans, dip->hmp); |
| 1838 | ++hammer_stats_file_iopsw; |
| 1839 | error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 0); |
| 1840 | hammer_done_transaction(&trans); |
| 1841 | if (error == 0) |
| 1842 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 1843 | return (error); |
| 1844 | } |
| 1845 | |
| 1846 | /* |
| 1847 | * hammer_vop_nrename { fnch, tnch, fdvp, tdvp, cred } |
| 1848 | */ |
| 1849 | static |
| 1850 | int |
| 1851 | hammer_vop_nrename(struct vop_nrename_args *ap) |
| 1852 | { |
| 1853 | struct hammer_transaction trans; |
| 1854 | struct namecache *fncp; |
| 1855 | struct namecache *tncp; |
| 1856 | struct hammer_inode *fdip; |
| 1857 | struct hammer_inode *tdip; |
| 1858 | struct hammer_inode *ip; |
| 1859 | struct hammer_cursor cursor; |
| 1860 | int64_t namekey; |
| 1861 | u_int32_t max_iterations; |
| 1862 | int nlen, error; |
| 1863 | |
| 1864 | if (ap->a_fdvp->v_mount != ap->a_tdvp->v_mount) |
| 1865 | return(EXDEV); |
| 1866 | if (ap->a_fdvp->v_mount != ap->a_fnch->ncp->nc_vp->v_mount) |
| 1867 | return(EXDEV); |
| 1868 | |
| 1869 | fdip = VTOI(ap->a_fdvp); |
| 1870 | tdip = VTOI(ap->a_tdvp); |
| 1871 | fncp = ap->a_fnch->ncp; |
| 1872 | tncp = ap->a_tnch->ncp; |
| 1873 | ip = VTOI(fncp->nc_vp); |
| 1874 | KKASSERT(ip != NULL); |
| 1875 | |
| 1876 | if (fdip->obj_localization != tdip->obj_localization) |
| 1877 | return(EXDEV); |
| 1878 | if (fdip->obj_localization != ip->obj_localization) |
| 1879 | return(EXDEV); |
| 1880 | |
| 1881 | if (fdip->flags & HAMMER_INODE_RO) |
| 1882 | return (EROFS); |
| 1883 | if (tdip->flags & HAMMER_INODE_RO) |
| 1884 | return (EROFS); |
| 1885 | if (ip->flags & HAMMER_INODE_RO) |
| 1886 | return (EROFS); |
| 1887 | if ((error = hammer_checkspace(fdip->hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 1888 | return (error); |
| 1889 | |
| 1890 | hammer_start_transaction(&trans, fdip->hmp); |
| 1891 | ++hammer_stats_file_iopsw; |
| 1892 | |
| 1893 | /* |
| 1894 | * Remove tncp from the target directory and then link ip as |
| 1895 | * tncp. XXX pass trans to dounlink |
| 1896 | * |
| 1897 | * Force the inode sync-time to match the transaction so it is |
| 1898 | * in-sync with the creation of the target directory entry. |
| 1899 | */ |
| 1900 | error = hammer_dounlink(&trans, ap->a_tnch, ap->a_tdvp, |
| 1901 | ap->a_cred, 0, -1); |
| 1902 | if (error == 0 || error == ENOENT) { |
| 1903 | error = hammer_ip_add_directory(&trans, tdip, |
| 1904 | tncp->nc_name, tncp->nc_nlen, |
| 1905 | ip); |
| 1906 | if (error == 0) { |
| 1907 | ip->ino_data.parent_obj_id = tdip->obj_id; |
| 1908 | ip->ino_data.ctime = trans.time; |
| 1909 | hammer_modify_inode(&trans, ip, HAMMER_INODE_DDIRTY); |
| 1910 | } |
| 1911 | } |
| 1912 | if (error) |
| 1913 | goto failed; /* XXX */ |
| 1914 | |
| 1915 | /* |
| 1916 | * Locate the record in the originating directory and remove it. |
| 1917 | * |
| 1918 | * Calculate the namekey and setup the key range for the scan. This |
| 1919 | * works kinda like a chained hash table where the lower 32 bits |
| 1920 | * of the namekey synthesize the chain. |
| 1921 | * |
| 1922 | * The key range is inclusive of both key_beg and key_end. |
| 1923 | */ |
| 1924 | namekey = hammer_directory_namekey(fdip, fncp->nc_name, fncp->nc_nlen, |
| 1925 | &max_iterations); |
| 1926 | retry: |
| 1927 | hammer_init_cursor(&trans, &cursor, &fdip->cache[1], fdip); |
| 1928 | cursor.key_beg.localization = fdip->obj_localization + |
| 1929 | hammer_dir_localization(fdip); |
| 1930 | cursor.key_beg.obj_id = fdip->obj_id; |
| 1931 | cursor.key_beg.key = namekey; |
| 1932 | cursor.key_beg.create_tid = 0; |
| 1933 | cursor.key_beg.delete_tid = 0; |
| 1934 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 1935 | cursor.key_beg.obj_type = 0; |
| 1936 | |
| 1937 | cursor.key_end = cursor.key_beg; |
| 1938 | cursor.key_end.key += max_iterations; |
| 1939 | cursor.asof = fdip->obj_asof; |
| 1940 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 1941 | |
| 1942 | /* |
| 1943 | * Scan all matching records (the chain), locate the one matching |
| 1944 | * the requested path component. |
| 1945 | * |
| 1946 | * The hammer_ip_*() functions merge in-memory records with on-disk |
| 1947 | * records for the purposes of the search. |
| 1948 | */ |
| 1949 | error = hammer_ip_first(&cursor); |
| 1950 | while (error == 0) { |
| 1951 | if (hammer_ip_resolve_data(&cursor) != 0) |
| 1952 | break; |
| 1953 | nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; |
| 1954 | KKASSERT(nlen > 0); |
| 1955 | if (fncp->nc_nlen == nlen && |
| 1956 | bcmp(fncp->nc_name, cursor.data->entry.name, nlen) == 0) { |
| 1957 | break; |
| 1958 | } |
| 1959 | error = hammer_ip_next(&cursor); |
| 1960 | } |
| 1961 | |
| 1962 | /* |
| 1963 | * If all is ok we have to get the inode so we can adjust nlinks. |
| 1964 | * |
| 1965 | * WARNING: hammer_ip_del_directory() may have to terminate the |
| 1966 | * cursor to avoid a recursion. It's ok to call hammer_done_cursor() |
| 1967 | * twice. |
| 1968 | */ |
| 1969 | if (error == 0) |
| 1970 | error = hammer_ip_del_directory(&trans, &cursor, fdip, ip); |
| 1971 | |
| 1972 | /* |
| 1973 | * XXX A deadlock here will break rename's atomicy for the purposes |
| 1974 | * of crash recovery. |
| 1975 | */ |
| 1976 | if (error == EDEADLK) { |
| 1977 | hammer_done_cursor(&cursor); |
| 1978 | goto retry; |
| 1979 | } |
| 1980 | |
| 1981 | /* |
| 1982 | * Cleanup and tell the kernel that the rename succeeded. |
| 1983 | */ |
| 1984 | hammer_done_cursor(&cursor); |
| 1985 | if (error == 0) { |
| 1986 | cache_rename(ap->a_fnch, ap->a_tnch); |
| 1987 | hammer_knote(ap->a_fdvp, NOTE_WRITE); |
| 1988 | hammer_knote(ap->a_tdvp, NOTE_WRITE); |
| 1989 | if (ip->vp) |
| 1990 | hammer_knote(ip->vp, NOTE_RENAME); |
| 1991 | } |
| 1992 | |
| 1993 | failed: |
| 1994 | hammer_done_transaction(&trans); |
| 1995 | return (error); |
| 1996 | } |
| 1997 | |
| 1998 | /* |
| 1999 | * hammer_vop_nrmdir { nch, dvp, cred } |
| 2000 | */ |
| 2001 | static |
| 2002 | int |
| 2003 | hammer_vop_nrmdir(struct vop_nrmdir_args *ap) |
| 2004 | { |
| 2005 | struct hammer_transaction trans; |
| 2006 | struct hammer_inode *dip; |
| 2007 | int error; |
| 2008 | |
| 2009 | dip = VTOI(ap->a_dvp); |
| 2010 | |
| 2011 | if (hammer_nohistory(dip) == 0 && |
| 2012 | (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { |
| 2013 | return (error); |
| 2014 | } |
| 2015 | |
| 2016 | hammer_start_transaction(&trans, dip->hmp); |
| 2017 | ++hammer_stats_file_iopsw; |
| 2018 | error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, ap->a_cred, 0, 1); |
| 2019 | hammer_done_transaction(&trans); |
| 2020 | if (error == 0) |
| 2021 | hammer_knote(ap->a_dvp, NOTE_WRITE | NOTE_LINK); |
| 2022 | return (error); |
| 2023 | } |
| 2024 | |
| 2025 | /* |
| 2026 | * hammer_vop_markatime { vp, cred } |
| 2027 | */ |
| 2028 | static |
| 2029 | int |
| 2030 | hammer_vop_markatime(struct vop_markatime_args *ap) |
| 2031 | { |
| 2032 | struct hammer_transaction trans; |
| 2033 | struct hammer_inode *ip; |
| 2034 | |
| 2035 | ip = VTOI(ap->a_vp); |
| 2036 | if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) |
| 2037 | return (EROFS); |
| 2038 | if (ip->flags & HAMMER_INODE_RO) |
| 2039 | return (EROFS); |
| 2040 | if (ip->hmp->mp->mnt_flag & MNT_NOATIME) |
| 2041 | return (0); |
| 2042 | hammer_start_transaction(&trans, ip->hmp); |
| 2043 | ++hammer_stats_file_iopsw; |
| 2044 | |
| 2045 | ip->ino_data.atime = trans.time; |
| 2046 | hammer_modify_inode(&trans, ip, HAMMER_INODE_ATIME); |
| 2047 | hammer_done_transaction(&trans); |
| 2048 | hammer_knote(ap->a_vp, NOTE_ATTRIB); |
| 2049 | return (0); |
| 2050 | } |
| 2051 | |
| 2052 | /* |
| 2053 | * hammer_vop_setattr { vp, vap, cred } |
| 2054 | */ |
| 2055 | static |
| 2056 | int |
| 2057 | hammer_vop_setattr(struct vop_setattr_args *ap) |
| 2058 | { |
| 2059 | struct hammer_transaction trans; |
| 2060 | struct vattr *vap; |
| 2061 | struct hammer_inode *ip; |
| 2062 | int modflags; |
| 2063 | int error; |
| 2064 | int truncating; |
| 2065 | int blksize; |
| 2066 | int kflags; |
| 2067 | #if 0 |
| 2068 | int64_t aligned_size; |
| 2069 | #endif |
| 2070 | u_int32_t flags; |
| 2071 | |
| 2072 | vap = ap->a_vap; |
| 2073 | ip = ap->a_vp->v_data; |
| 2074 | modflags = 0; |
| 2075 | kflags = 0; |
| 2076 | |
| 2077 | if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) |
| 2078 | return(EROFS); |
| 2079 | if (ip->flags & HAMMER_INODE_RO) |
| 2080 | return (EROFS); |
| 2081 | if (hammer_nohistory(ip) == 0 && |
| 2082 | (error = hammer_checkspace(ip->hmp, HAMMER_CHKSPC_REMOVE)) != 0) { |
| 2083 | return (error); |
| 2084 | } |
| 2085 | |
| 2086 | hammer_start_transaction(&trans, ip->hmp); |
| 2087 | ++hammer_stats_file_iopsw; |
| 2088 | error = 0; |
| 2089 | |
| 2090 | if (vap->va_flags != VNOVAL) { |
| 2091 | flags = ip->ino_data.uflags; |
| 2092 | error = vop_helper_setattr_flags(&flags, vap->va_flags, |
| 2093 | hammer_to_unix_xid(&ip->ino_data.uid), |
| 2094 | ap->a_cred); |
| 2095 | if (error == 0) { |
| 2096 | if (ip->ino_data.uflags != flags) { |
| 2097 | ip->ino_data.uflags = flags; |
| 2098 | ip->ino_data.ctime = trans.time; |
| 2099 | modflags |= HAMMER_INODE_DDIRTY; |
| 2100 | kflags |= NOTE_ATTRIB; |
| 2101 | } |
| 2102 | if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { |
| 2103 | error = 0; |
| 2104 | goto done; |
| 2105 | } |
| 2106 | } |
| 2107 | goto done; |
| 2108 | } |
| 2109 | if (ip->ino_data.uflags & (IMMUTABLE | APPEND)) { |
| 2110 | error = EPERM; |
| 2111 | goto done; |
| 2112 | } |
| 2113 | if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { |
| 2114 | mode_t cur_mode = ip->ino_data.mode; |
| 2115 | uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 2116 | gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 2117 | uuid_t uuid_uid; |
| 2118 | uuid_t uuid_gid; |
| 2119 | |
| 2120 | error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid, |
| 2121 | ap->a_cred, |
| 2122 | &cur_uid, &cur_gid, &cur_mode); |
| 2123 | if (error == 0) { |
| 2124 | hammer_guid_to_uuid(&uuid_uid, cur_uid); |
| 2125 | hammer_guid_to_uuid(&uuid_gid, cur_gid); |
| 2126 | if (bcmp(&uuid_uid, &ip->ino_data.uid, |
| 2127 | sizeof(uuid_uid)) || |
| 2128 | bcmp(&uuid_gid, &ip->ino_data.gid, |
| 2129 | sizeof(uuid_gid)) || |
| 2130 | ip->ino_data.mode != cur_mode |
| 2131 | ) { |
| 2132 | ip->ino_data.uid = uuid_uid; |
| 2133 | ip->ino_data.gid = uuid_gid; |
| 2134 | ip->ino_data.mode = cur_mode; |
| 2135 | ip->ino_data.ctime = trans.time; |
| 2136 | modflags |= HAMMER_INODE_DDIRTY; |
| 2137 | } |
| 2138 | kflags |= NOTE_ATTRIB; |
| 2139 | } |
| 2140 | } |
| 2141 | while (vap->va_size != VNOVAL && ip->ino_data.size != vap->va_size) { |
| 2142 | switch(ap->a_vp->v_type) { |
| 2143 | case VREG: |
| 2144 | if (vap->va_size == ip->ino_data.size) |
| 2145 | break; |
| 2146 | |
| 2147 | /* |
| 2148 | * Log the operation if in fast-fsync mode or if |
| 2149 | * there are unterminated redo write records present. |
| 2150 | * |
| 2151 | * The second check is needed so the recovery code |
| 2152 | * properly truncates write redos even if nominal |
| 2153 | * REDO operations is turned off due to excessive |
| 2154 | * writes, because the related records might be |
| 2155 | * destroyed and never lay down a TERM_WRITE. |
| 2156 | */ |
| 2157 | if ((ip->flags & HAMMER_INODE_REDO) || |
| 2158 | (ip->flags & HAMMER_INODE_RDIRTY)) { |
| 2159 | error = hammer_generate_redo(&trans, ip, |
| 2160 | vap->va_size, |
| 2161 | HAMMER_REDO_TRUNC, |
| 2162 | NULL, 0); |
| 2163 | } |
| 2164 | blksize = hammer_blocksize(vap->va_size); |
| 2165 | |
| 2166 | /* |
| 2167 | * XXX break atomicy, we can deadlock the backend |
| 2168 | * if we do not release the lock. Probably not a |
| 2169 | * big deal here. |
| 2170 | */ |
| 2171 | if (vap->va_size < ip->ino_data.size) { |
| 2172 | nvtruncbuf(ap->a_vp, vap->va_size, |
| 2173 | blksize, |
| 2174 | hammer_blockoff(vap->va_size)); |
| 2175 | truncating = 1; |
| 2176 | kflags |= NOTE_WRITE; |
| 2177 | } else { |
| 2178 | nvextendbuf(ap->a_vp, |
| 2179 | ip->ino_data.size, |
| 2180 | vap->va_size, |
| 2181 | hammer_blocksize(ip->ino_data.size), |
| 2182 | hammer_blocksize(vap->va_size), |
| 2183 | hammer_blockoff(ip->ino_data.size), |
| 2184 | hammer_blockoff(vap->va_size), |
| 2185 | 0); |
| 2186 | truncating = 0; |
| 2187 | kflags |= NOTE_WRITE | NOTE_EXTEND; |
| 2188 | } |
| 2189 | ip->ino_data.size = vap->va_size; |
| 2190 | ip->ino_data.mtime = trans.time; |
| 2191 | /* XXX safe to use SDIRTY instead of DDIRTY here? */ |
| 2192 | modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; |
| 2193 | |
| 2194 | /* |
| 2195 | * On-media truncation is cached in the inode until |
| 2196 | * the inode is synchronized. We must immediately |
| 2197 | * handle any frontend records. |
| 2198 | */ |
| 2199 | if (truncating) { |
| 2200 | hammer_ip_frontend_trunc(ip, vap->va_size); |
| 2201 | #ifdef DEBUG_TRUNCATE |
| 2202 | if (HammerTruncIp == NULL) |
| 2203 | HammerTruncIp = ip; |
| 2204 | #endif |
| 2205 | if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { |
| 2206 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 2207 | ip->trunc_off = vap->va_size; |
| 2208 | #ifdef DEBUG_TRUNCATE |
| 2209 | if (ip == HammerTruncIp) |
| 2210 | kprintf("truncate1 %016llx\n", |
| 2211 | (long long)ip->trunc_off); |
| 2212 | #endif |
| 2213 | } else if (ip->trunc_off > vap->va_size) { |
| 2214 | ip->trunc_off = vap->va_size; |
| 2215 | #ifdef DEBUG_TRUNCATE |
| 2216 | if (ip == HammerTruncIp) |
| 2217 | kprintf("truncate2 %016llx\n", |
| 2218 | (long long)ip->trunc_off); |
| 2219 | #endif |
| 2220 | } else { |
| 2221 | #ifdef DEBUG_TRUNCATE |
| 2222 | if (ip == HammerTruncIp) |
| 2223 | kprintf("truncate3 %016llx (ignored)\n", |
| 2224 | (long long)vap->va_size); |
| 2225 | #endif |
| 2226 | } |
| 2227 | } |
| 2228 | |
| 2229 | #if 0 |
| 2230 | /* |
| 2231 | * When truncating, nvtruncbuf() may have cleaned out |
| 2232 | * a portion of the last block on-disk in the buffer |
| 2233 | * cache. We must clean out any frontend records |
| 2234 | * for blocks beyond the new last block. |
| 2235 | */ |
| 2236 | aligned_size = (vap->va_size + (blksize - 1)) & |
| 2237 | ~(int64_t)(blksize - 1); |
| 2238 | if (truncating && vap->va_size < aligned_size) { |
| 2239 | aligned_size -= blksize; |
| 2240 | hammer_ip_frontend_trunc(ip, aligned_size); |
| 2241 | } |
| 2242 | #endif |
| 2243 | break; |
| 2244 | case VDATABASE: |
| 2245 | if ((ip->flags & HAMMER_INODE_TRUNCATED) == 0) { |
| 2246 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 2247 | ip->trunc_off = vap->va_size; |
| 2248 | } else if (ip->trunc_off > vap->va_size) { |
| 2249 | ip->trunc_off = vap->va_size; |
| 2250 | } |
| 2251 | hammer_ip_frontend_trunc(ip, vap->va_size); |
| 2252 | ip->ino_data.size = vap->va_size; |
| 2253 | ip->ino_data.mtime = trans.time; |
| 2254 | modflags |= HAMMER_INODE_MTIME | HAMMER_INODE_DDIRTY; |
| 2255 | kflags |= NOTE_ATTRIB; |
| 2256 | break; |
| 2257 | default: |
| 2258 | error = EINVAL; |
| 2259 | goto done; |
| 2260 | } |
| 2261 | break; |
| 2262 | } |
| 2263 | if (vap->va_atime.tv_sec != VNOVAL) { |
| 2264 | ip->ino_data.atime = hammer_timespec_to_time(&vap->va_atime); |
| 2265 | modflags |= HAMMER_INODE_ATIME; |
| 2266 | kflags |= NOTE_ATTRIB; |
| 2267 | } |
| 2268 | if (vap->va_mtime.tv_sec != VNOVAL) { |
| 2269 | ip->ino_data.mtime = hammer_timespec_to_time(&vap->va_mtime); |
| 2270 | modflags |= HAMMER_INODE_MTIME; |
| 2271 | kflags |= NOTE_ATTRIB; |
| 2272 | } |
| 2273 | if (vap->va_mode != (mode_t)VNOVAL) { |
| 2274 | mode_t cur_mode = ip->ino_data.mode; |
| 2275 | uid_t cur_uid = hammer_to_unix_xid(&ip->ino_data.uid); |
| 2276 | gid_t cur_gid = hammer_to_unix_xid(&ip->ino_data.gid); |
| 2277 | |
| 2278 | error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred, |
| 2279 | cur_uid, cur_gid, &cur_mode); |
| 2280 | if (error == 0 && ip->ino_data.mode != cur_mode) { |
| 2281 | ip->ino_data.mode = cur_mode; |
| 2282 | ip->ino_data.ctime = trans.time; |
| 2283 | modflags |= HAMMER_INODE_DDIRTY; |
| 2284 | kflags |= NOTE_ATTRIB; |
| 2285 | } |
| 2286 | } |
| 2287 | done: |
| 2288 | if (error == 0) |
| 2289 | hammer_modify_inode(&trans, ip, modflags); |
| 2290 | hammer_done_transaction(&trans); |
| 2291 | hammer_knote(ap->a_vp, kflags); |
| 2292 | return (error); |
| 2293 | } |
| 2294 | |
| 2295 | /* |
| 2296 | * hammer_vop_nsymlink { nch, dvp, vpp, cred, vap, target } |
| 2297 | */ |
| 2298 | static |
| 2299 | int |
| 2300 | hammer_vop_nsymlink(struct vop_nsymlink_args *ap) |
| 2301 | { |
| 2302 | struct hammer_transaction trans; |
| 2303 | struct hammer_inode *dip; |
| 2304 | struct hammer_inode *nip; |
| 2305 | struct nchandle *nch; |
| 2306 | hammer_record_t record; |
| 2307 | int error; |
| 2308 | int bytes; |
| 2309 | |
| 2310 | ap->a_vap->va_type = VLNK; |
| 2311 | |
| 2312 | nch = ap->a_nch; |
| 2313 | dip = VTOI(ap->a_dvp); |
| 2314 | |
| 2315 | if (dip->flags & HAMMER_INODE_RO) |
| 2316 | return (EROFS); |
| 2317 | if ((error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) |
| 2318 | return (error); |
| 2319 | |
| 2320 | /* |
| 2321 | * Create a transaction to cover the operations we perform. |
| 2322 | */ |
| 2323 | hammer_start_transaction(&trans, dip->hmp); |
| 2324 | ++hammer_stats_file_iopsw; |
| 2325 | |
| 2326 | /* |
| 2327 | * Create a new filesystem object of the requested type. The |
| 2328 | * returned inode will be referenced but not locked. |
| 2329 | */ |
| 2330 | |
| 2331 | error = hammer_create_inode(&trans, ap->a_vap, ap->a_cred, |
| 2332 | dip, nch->ncp->nc_name, nch->ncp->nc_nlen, |
| 2333 | NULL, &nip); |
| 2334 | if (error) { |
| 2335 | hammer_done_transaction(&trans); |
| 2336 | *ap->a_vpp = NULL; |
| 2337 | return (error); |
| 2338 | } |
| 2339 | |
| 2340 | /* |
| 2341 | * Add a record representing the symlink. symlink stores the link |
| 2342 | * as pure data, not a string, and is no \0 terminated. |
| 2343 | */ |
| 2344 | if (error == 0) { |
| 2345 | bytes = strlen(ap->a_target); |
| 2346 | |
| 2347 | if (bytes <= HAMMER_INODE_BASESYMLEN) { |
| 2348 | bcopy(ap->a_target, nip->ino_data.ext.symlink, bytes); |
| 2349 | } else { |
| 2350 | record = hammer_alloc_mem_record(nip, bytes); |
| 2351 | record->type = HAMMER_MEM_RECORD_GENERAL; |
| 2352 | |
| 2353 | record->leaf.base.localization = nip->obj_localization + |
| 2354 | HAMMER_LOCALIZE_MISC; |
| 2355 | record->leaf.base.key = HAMMER_FIXKEY_SYMLINK; |
| 2356 | record->leaf.base.rec_type = HAMMER_RECTYPE_FIX; |
| 2357 | record->leaf.data_len = bytes; |
| 2358 | KKASSERT(HAMMER_SYMLINK_NAME_OFF == 0); |
| 2359 | bcopy(ap->a_target, record->data->symlink.name, bytes); |
| 2360 | error = hammer_ip_add_record(&trans, record); |
| 2361 | } |
| 2362 | |
| 2363 | /* |
| 2364 | * Set the file size to the length of the link. |
| 2365 | */ |
| 2366 | if (error == 0) { |
| 2367 | nip->ino_data.size = bytes; |
| 2368 | hammer_modify_inode(&trans, nip, HAMMER_INODE_DDIRTY); |
| 2369 | } |
| 2370 | } |
| 2371 | if (error == 0) |
| 2372 | error = hammer_ip_add_directory(&trans, dip, nch->ncp->nc_name, |
| 2373 | nch->ncp->nc_nlen, nip); |
| 2374 | |
| 2375 | /* |
| 2376 | * Finish up. |
| 2377 | */ |
| 2378 | if (error) { |
| 2379 | hammer_rel_inode(nip, 0); |
| 2380 | *ap->a_vpp = NULL; |
| 2381 | } else { |
| 2382 | error = hammer_get_vnode(nip, ap->a_vpp); |
| 2383 | hammer_rel_inode(nip, 0); |
| 2384 | if (error == 0) { |
| 2385 | cache_setunresolved(ap->a_nch); |
| 2386 | cache_setvp(ap->a_nch, *ap->a_vpp); |
| 2387 | hammer_knote(ap->a_dvp, NOTE_WRITE); |
| 2388 | } |
| 2389 | } |
| 2390 | hammer_done_transaction(&trans); |
| 2391 | return (error); |
| 2392 | } |
| 2393 | |
| 2394 | /* |
| 2395 | * hammer_vop_nwhiteout { nch, dvp, cred, flags } |
| 2396 | */ |
| 2397 | static |
| 2398 | int |
| 2399 | hammer_vop_nwhiteout(struct vop_nwhiteout_args *ap) |
| 2400 | { |
| 2401 | struct hammer_transaction trans; |
| 2402 | struct hammer_inode *dip; |
| 2403 | int error; |
| 2404 | |
| 2405 | dip = VTOI(ap->a_dvp); |
| 2406 | |
| 2407 | if (hammer_nohistory(dip) == 0 && |
| 2408 | (error = hammer_checkspace(dip->hmp, HAMMER_CHKSPC_CREATE)) != 0) { |
| 2409 | return (error); |
| 2410 | } |
| 2411 | |
| 2412 | hammer_start_transaction(&trans, dip->hmp); |
| 2413 | ++hammer_stats_file_iopsw; |
| 2414 | error = hammer_dounlink(&trans, ap->a_nch, ap->a_dvp, |
| 2415 | ap->a_cred, ap->a_flags, -1); |
| 2416 | hammer_done_transaction(&trans); |
| 2417 | |
| 2418 | return (error); |
| 2419 | } |
| 2420 | |
| 2421 | /* |
| 2422 | * hammer_vop_ioctl { vp, command, data, fflag, cred } |
| 2423 | */ |
| 2424 | static |
| 2425 | int |
| 2426 | hammer_vop_ioctl(struct vop_ioctl_args *ap) |
| 2427 | { |
| 2428 | struct hammer_inode *ip = ap->a_vp->v_data; |
| 2429 | |
| 2430 | ++hammer_stats_file_iopsr; |
| 2431 | return(hammer_ioctl(ip, ap->a_command, ap->a_data, |
| 2432 | ap->a_fflag, ap->a_cred)); |
| 2433 | } |
| 2434 | |
| 2435 | static |
| 2436 | int |
| 2437 | hammer_vop_mountctl(struct vop_mountctl_args *ap) |
| 2438 | { |
| 2439 | static const struct mountctl_opt extraopt[] = { |
| 2440 | { HMNT_NOHISTORY, "nohistory" }, |
| 2441 | { HMNT_MASTERID, "master" }, |
| 2442 | { 0, NULL} |
| 2443 | |
| 2444 | }; |
| 2445 | struct hammer_mount *hmp; |
| 2446 | struct mount *mp; |
| 2447 | int usedbytes; |
| 2448 | int error; |
| 2449 | |
| 2450 | error = 0; |
| 2451 | usedbytes = 0; |
| 2452 | mp = ap->a_head.a_ops->head.vv_mount; |
| 2453 | KKASSERT(mp->mnt_data != NULL); |
| 2454 | hmp = (struct hammer_mount *)mp->mnt_data; |
| 2455 | |
| 2456 | switch(ap->a_op) { |
| 2457 | |
| 2458 | case MOUNTCTL_SET_EXPORT: |
| 2459 | if (ap->a_ctllen != sizeof(struct export_args)) |
| 2460 | error = EINVAL; |
| 2461 | else |
| 2462 | error = hammer_vfs_export(mp, ap->a_op, |
| 2463 | (const struct export_args *)ap->a_ctl); |
| 2464 | break; |
| 2465 | case MOUNTCTL_MOUNTFLAGS: |
| 2466 | { |
| 2467 | /* |
| 2468 | * Call standard mountctl VOP function |
| 2469 | * so we get user mount flags. |
| 2470 | */ |
| 2471 | error = vop_stdmountctl(ap); |
| 2472 | if (error) |
| 2473 | break; |
| 2474 | |
| 2475 | usedbytes = *ap->a_res; |
| 2476 | |
| 2477 | if (usedbytes > 0 && usedbytes < ap->a_buflen) { |
| 2478 | usedbytes += vfs_flagstostr(hmp->hflags, extraopt, ap->a_buf, |
| 2479 | ap->a_buflen - usedbytes, |
| 2480 | &error); |
| 2481 | } |
| 2482 | |
| 2483 | *ap->a_res += usedbytes; |
| 2484 | break; |
| 2485 | } |
| 2486 | default: |
| 2487 | error = vop_stdmountctl(ap); |
| 2488 | break; |
| 2489 | } |
| 2490 | return(error); |
| 2491 | } |
| 2492 | |
| 2493 | /* |
| 2494 | * hammer_vop_strategy { vp, bio } |
| 2495 | * |
| 2496 | * Strategy call, used for regular file read & write only. Note that the |
| 2497 | * bp may represent a cluster. |
| 2498 | * |
| 2499 | * To simplify operation and allow better optimizations in the future, |
| 2500 | * this code does not make any assumptions with regards to buffer alignment |
| 2501 | * or size. |
| 2502 | */ |
| 2503 | static |
| 2504 | int |
| 2505 | hammer_vop_strategy(struct vop_strategy_args *ap) |
| 2506 | { |
| 2507 | struct buf *bp; |
| 2508 | int error; |
| 2509 | |
| 2510 | bp = ap->a_bio->bio_buf; |
| 2511 | |
| 2512 | switch(bp->b_cmd) { |
| 2513 | case BUF_CMD_READ: |
| 2514 | error = hammer_vop_strategy_read(ap); |
| 2515 | break; |
| 2516 | case BUF_CMD_WRITE: |
| 2517 | error = hammer_vop_strategy_write(ap); |
| 2518 | break; |
| 2519 | default: |
| 2520 | bp->b_error = error = EINVAL; |
| 2521 | bp->b_flags |= B_ERROR; |
| 2522 | biodone(ap->a_bio); |
| 2523 | break; |
| 2524 | } |
| 2525 | return (error); |
| 2526 | } |
| 2527 | |
| 2528 | /* |
| 2529 | * Read from a regular file. Iterate the related records and fill in the |
| 2530 | * BIO/BUF. Gaps are zero-filled. |
| 2531 | * |
| 2532 | * The support code in hammer_object.c should be used to deal with mixed |
| 2533 | * in-memory and on-disk records. |
| 2534 | * |
| 2535 | * NOTE: Can be called from the cluster code with an oversized buf. |
| 2536 | * |
| 2537 | * XXX atime update |
| 2538 | */ |
| 2539 | static |
| 2540 | int |
| 2541 | hammer_vop_strategy_read(struct vop_strategy_args *ap) |
| 2542 | { |
| 2543 | struct hammer_transaction trans; |
| 2544 | struct hammer_inode *ip; |
| 2545 | struct hammer_inode *dip; |
| 2546 | struct hammer_cursor cursor; |
| 2547 | hammer_base_elm_t base; |
| 2548 | hammer_off_t disk_offset; |
| 2549 | struct bio *bio; |
| 2550 | struct bio *nbio; |
| 2551 | struct buf *bp; |
| 2552 | int64_t rec_offset; |
| 2553 | int64_t ran_end; |
| 2554 | int64_t tmp64; |
| 2555 | int error; |
| 2556 | int boff; |
| 2557 | int roff; |
| 2558 | int n; |
| 2559 | |
| 2560 | bio = ap->a_bio; |
| 2561 | bp = bio->bio_buf; |
| 2562 | ip = ap->a_vp->v_data; |
| 2563 | |
| 2564 | /* |
| 2565 | * The zone-2 disk offset may have been set by the cluster code via |
| 2566 | * a BMAP operation, or else should be NOOFFSET. |
| 2567 | * |
| 2568 | * Checking the high bits for a match against zone-2 should suffice. |
| 2569 | */ |
| 2570 | nbio = push_bio(bio); |
| 2571 | if ((nbio->bio_offset & HAMMER_OFF_ZONE_MASK) == |
| 2572 | HAMMER_ZONE_LARGE_DATA) { |
| 2573 | error = hammer_io_direct_read(ip->hmp, nbio, NULL); |
| 2574 | return (error); |
| 2575 | } |
| 2576 | |
| 2577 | /* |
| 2578 | * Well, that sucked. Do it the hard way. If all the stars are |
| 2579 | * aligned we may still be able to issue a direct-read. |
| 2580 | */ |
| 2581 | hammer_simple_transaction(&trans, ip->hmp); |
| 2582 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 2583 | |
| 2584 | /* |
| 2585 | * Key range (begin and end inclusive) to scan. Note that the key's |
| 2586 | * stored in the actual records represent BASE+LEN, not BASE. The |
| 2587 | * first record containing bio_offset will have a key > bio_offset. |
| 2588 | */ |
| 2589 | cursor.key_beg.localization = ip->obj_localization + |
| 2590 | HAMMER_LOCALIZE_MISC; |
| 2591 | cursor.key_beg.obj_id = ip->obj_id; |
| 2592 | cursor.key_beg.create_tid = 0; |
| 2593 | cursor.key_beg.delete_tid = 0; |
| 2594 | cursor.key_beg.obj_type = 0; |
| 2595 | cursor.key_beg.key = bio->bio_offset + 1; |
| 2596 | cursor.asof = ip->obj_asof; |
| 2597 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 2598 | |
| 2599 | cursor.key_end = cursor.key_beg; |
| 2600 | KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); |
| 2601 | #if 0 |
| 2602 | if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DBFILE) { |
| 2603 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DB; |
| 2604 | cursor.key_end.rec_type = HAMMER_RECTYPE_DB; |
| 2605 | cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; |
| 2606 | } else |
| 2607 | #endif |
| 2608 | { |
| 2609 | ran_end = bio->bio_offset + bp->b_bufsize; |
| 2610 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; |
| 2611 | cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; |
| 2612 | tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ |
| 2613 | if (tmp64 < ran_end) |
| 2614 | cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; |
| 2615 | else |
| 2616 | cursor.key_end.key = ran_end + MAXPHYS + 1; |
| 2617 | } |
| 2618 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; |
| 2619 | |
| 2620 | error = hammer_ip_first(&cursor); |
| 2621 | boff = 0; |
| 2622 | |
| 2623 | while (error == 0) { |
| 2624 | /* |
| 2625 | * Get the base file offset of the record. The key for |
| 2626 | * data records is (base + bytes) rather then (base). |
| 2627 | */ |
| 2628 | base = &cursor.leaf->base; |
| 2629 | rec_offset = base->key - cursor.leaf->data_len; |
| 2630 | |
| 2631 | /* |
| 2632 | * Calculate the gap, if any, and zero-fill it. |
| 2633 | * |
| 2634 | * n is the offset of the start of the record verses our |
| 2635 | * current seek offset in the bio. |
| 2636 | */ |
| 2637 | n = (int)(rec_offset - (bio->bio_offset + boff)); |
| 2638 | if (n > 0) { |
| 2639 | if (n > bp->b_bufsize - boff) |
| 2640 | n = bp->b_bufsize - boff; |
| 2641 | bzero((char *)bp->b_data + boff, n); |
| 2642 | boff += n; |
| 2643 | n = 0; |
| 2644 | } |
| 2645 | |
| 2646 | /* |
| 2647 | * Calculate the data offset in the record and the number |
| 2648 | * of bytes we can copy. |
| 2649 | * |
| 2650 | * There are two degenerate cases. First, boff may already |
| 2651 | * be at bp->b_bufsize. Secondly, the data offset within |
| 2652 | * the record may exceed the record's size. |
| 2653 | */ |
| 2654 | roff = -n; |
| 2655 | rec_offset += roff; |
| 2656 | n = cursor.leaf->data_len - roff; |
| 2657 | if (n <= 0) { |
| 2658 | kprintf("strategy_read: bad n=%d roff=%d\n", n, roff); |
| 2659 | n = 0; |
| 2660 | } else if (n > bp->b_bufsize - boff) { |
| 2661 | n = bp->b_bufsize - boff; |
| 2662 | } |
| 2663 | |
| 2664 | /* |
| 2665 | * Deal with cached truncations. This cool bit of code |
| 2666 | * allows truncate()/ftruncate() to avoid having to sync |
| 2667 | * the file. |
| 2668 | * |
| 2669 | * If the frontend is truncated then all backend records are |
| 2670 | * subject to the frontend's truncation. |
| 2671 | * |
| 2672 | * If the backend is truncated then backend records on-disk |
| 2673 | * (but not in-memory) are subject to the backend's |
| 2674 | * truncation. In-memory records owned by the backend |
| 2675 | * represent data written after the truncation point on the |
| 2676 | * backend and must not be truncated. |
| 2677 | * |
| 2678 | * Truncate operations deal with frontend buffer cache |
| 2679 | * buffers and frontend-owned in-memory records synchronously. |
| 2680 | */ |
| 2681 | if (ip->flags & HAMMER_INODE_TRUNCATED) { |
| 2682 | if (hammer_cursor_ondisk(&cursor)/* || |
| 2683 | cursor.iprec->flush_state == HAMMER_FST_FLUSH*/) { |
| 2684 | if (ip->trunc_off <= rec_offset) |
| 2685 | n = 0; |
| 2686 | else if (ip->trunc_off < rec_offset + n) |
| 2687 | n = (int)(ip->trunc_off - rec_offset); |
| 2688 | } |
| 2689 | } |
| 2690 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 2691 | if (hammer_cursor_ondisk(&cursor)) { |
| 2692 | if (ip->sync_trunc_off <= rec_offset) |
| 2693 | n = 0; |
| 2694 | else if (ip->sync_trunc_off < rec_offset + n) |
| 2695 | n = (int)(ip->sync_trunc_off - rec_offset); |
| 2696 | } |
| 2697 | } |
| 2698 | |
| 2699 | /* |
| 2700 | * Try to issue a direct read into our bio if possible, |
| 2701 | * otherwise resolve the element data into a hammer_buffer |
| 2702 | * and copy. |
| 2703 | * |
| 2704 | * The buffer on-disk should be zerod past any real |
| 2705 | * truncation point, but may not be for any synthesized |
| 2706 | * truncation point from above. |
| 2707 | */ |
| 2708 | disk_offset = cursor.leaf->data_offset + roff; |
| 2709 | if (boff == 0 && n == bp->b_bufsize && |
| 2710 | hammer_cursor_ondisk(&cursor) && |
| 2711 | (disk_offset & HAMMER_BUFMASK) == 0) { |
| 2712 | KKASSERT((disk_offset & HAMMER_OFF_ZONE_MASK) == |
| 2713 | HAMMER_ZONE_LARGE_DATA); |
| 2714 | nbio->bio_offset = disk_offset; |
| 2715 | error = hammer_io_direct_read(trans.hmp, nbio, |
| 2716 | cursor.leaf); |
| 2717 | goto done; |
| 2718 | } else if (n) { |
| 2719 | error = hammer_ip_resolve_data(&cursor); |
| 2720 | if (error == 0) { |
| 2721 | bcopy((char *)cursor.data + roff, |
| 2722 | (char *)bp->b_data + boff, n); |
| 2723 | } |
| 2724 | } |
| 2725 | if (error) |
| 2726 | break; |
| 2727 | |
| 2728 | /* |
| 2729 | * Iterate until we have filled the request. |
| 2730 | */ |
| 2731 | boff += n; |
| 2732 | if (boff == bp->b_bufsize) |
| 2733 | break; |
| 2734 | error = hammer_ip_next(&cursor); |
| 2735 | } |
| 2736 | |
| 2737 | /* |
| 2738 | * There may have been a gap after the last record |
| 2739 | */ |
| 2740 | if (error == ENOENT) |
| 2741 | error = 0; |
| 2742 | if (error == 0 && boff != bp->b_bufsize) { |
| 2743 | KKASSERT(boff < bp->b_bufsize); |
| 2744 | bzero((char *)bp->b_data + boff, bp->b_bufsize - boff); |
| 2745 | /* boff = bp->b_bufsize; */ |
| 2746 | } |
| 2747 | bp->b_resid = 0; |
| 2748 | bp->b_error = error; |
| 2749 | if (error) |
| 2750 | bp->b_flags |= B_ERROR; |
| 2751 | biodone(ap->a_bio); |
| 2752 | |
| 2753 | done: |
| 2754 | /* |
| 2755 | * Cache the b-tree node for the last data read in cache[1]. |
| 2756 | * |
| 2757 | * If we hit the file EOF then also cache the node in the |
| 2758 | * governing director's cache[3], it will be used to initialize |
| 2759 | * the inode's cache[1] for any inodes looked up via the directory. |
| 2760 | * |
| 2761 | * This doesn't reduce disk accesses since the B-Tree chain is |
| 2762 | * likely cached, but it does reduce cpu overhead when looking |
| 2763 | * up file offsets for cpdup/tar/cpio style iterations. |
| 2764 | */ |
| 2765 | if (cursor.node) |
| 2766 | hammer_cache_node(&ip->cache[1], cursor.node); |
| 2767 | if (ran_end >= ip->ino_data.size) { |
| 2768 | dip = hammer_find_inode(&trans, ip->ino_data.parent_obj_id, |
| 2769 | ip->obj_asof, ip->obj_localization); |
| 2770 | if (dip) { |
| 2771 | hammer_cache_node(&dip->cache[3], cursor.node); |
| 2772 | hammer_rel_inode(dip, 0); |
| 2773 | } |
| 2774 | } |
| 2775 | hammer_done_cursor(&cursor); |
| 2776 | hammer_done_transaction(&trans); |
| 2777 | return(error); |
| 2778 | } |
| 2779 | |
| 2780 | /* |
| 2781 | * BMAP operation - used to support cluster_read() only. |
| 2782 | * |
| 2783 | * (struct vnode *vp, off_t loffset, off_t *doffsetp, int *runp, int *runb) |
| 2784 | * |
| 2785 | * This routine may return EOPNOTSUPP if the opration is not supported for |
| 2786 | * the specified offset. The contents of the pointer arguments do not |
| 2787 | * need to be initialized in that case. |
| 2788 | * |
| 2789 | * If a disk address is available and properly aligned return 0 with |
| 2790 | * *doffsetp set to the zone-2 address, and *runp / *runb set appropriately |
| 2791 | * to the run-length relative to that offset. Callers may assume that |
| 2792 | * *doffsetp is valid if 0 is returned, even if *runp is not sufficiently |
| 2793 | * large, so return EOPNOTSUPP if it is not sufficiently large. |
| 2794 | */ |
| 2795 | static |
| 2796 | int |
| 2797 | hammer_vop_bmap(struct vop_bmap_args *ap) |
| 2798 | { |
| 2799 | struct hammer_transaction trans; |
| 2800 | struct hammer_inode *ip; |
| 2801 | struct hammer_cursor cursor; |
| 2802 | hammer_base_elm_t base; |
| 2803 | int64_t rec_offset; |
| 2804 | int64_t ran_end; |
| 2805 | int64_t tmp64; |
| 2806 | int64_t base_offset; |
| 2807 | int64_t base_disk_offset; |
| 2808 | int64_t last_offset; |
| 2809 | hammer_off_t last_disk_offset; |
| 2810 | hammer_off_t disk_offset; |
| 2811 | int rec_len; |
| 2812 | int error; |
| 2813 | int blksize; |
| 2814 | |
| 2815 | ++hammer_stats_file_iopsr; |
| 2816 | ip = ap->a_vp->v_data; |
| 2817 | |
| 2818 | /* |
| 2819 | * We can only BMAP regular files. We can't BMAP database files, |
| 2820 | * directories, etc. |
| 2821 | */ |
| 2822 | if (ip->ino_data.obj_type != HAMMER_OBJTYPE_REGFILE) |
| 2823 | return(EOPNOTSUPP); |
| 2824 | |
| 2825 | /* |
| 2826 | * bmap is typically called with runp/runb both NULL when used |
| 2827 | * for writing. We do not support BMAP for writing atm. |
| 2828 | */ |
| 2829 | if (ap->a_cmd != BUF_CMD_READ) |
| 2830 | return(EOPNOTSUPP); |
| 2831 | |
| 2832 | /* |
| 2833 | * Scan the B-Tree to acquire blockmap addresses, then translate |
| 2834 | * to raw addresses. |
| 2835 | */ |
| 2836 | hammer_simple_transaction(&trans, ip->hmp); |
| 2837 | #if 0 |
| 2838 | kprintf("bmap_beg %016llx ip->cache %p\n", |
| 2839 | (long long)ap->a_loffset, ip->cache[1]); |
| 2840 | #endif |
| 2841 | hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 2842 | |
| 2843 | /* |
| 2844 | * Key range (begin and end inclusive) to scan. Note that the key's |
| 2845 | * stored in the actual records represent BASE+LEN, not BASE. The |
| 2846 | * first record containing bio_offset will have a key > bio_offset. |
| 2847 | */ |
| 2848 | cursor.key_beg.localization = ip->obj_localization + |
| 2849 | HAMMER_LOCALIZE_MISC; |
| 2850 | cursor.key_beg.obj_id = ip->obj_id; |
| 2851 | cursor.key_beg.create_tid = 0; |
| 2852 | cursor.key_beg.delete_tid = 0; |
| 2853 | cursor.key_beg.obj_type = 0; |
| 2854 | if (ap->a_runb) |
| 2855 | cursor.key_beg.key = ap->a_loffset - MAXPHYS + 1; |
| 2856 | else |
| 2857 | cursor.key_beg.key = ap->a_loffset + 1; |
| 2858 | if (cursor.key_beg.key < 0) |
| 2859 | cursor.key_beg.key = 0; |
| 2860 | cursor.asof = ip->obj_asof; |
| 2861 | cursor.flags |= HAMMER_CURSOR_ASOF; |
| 2862 | |
| 2863 | cursor.key_end = cursor.key_beg; |
| 2864 | KKASSERT(ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE); |
| 2865 | |
| 2866 | ran_end = ap->a_loffset + MAXPHYS; |
| 2867 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA; |
| 2868 | cursor.key_end.rec_type = HAMMER_RECTYPE_DATA; |
| 2869 | tmp64 = ran_end + MAXPHYS + 1; /* work-around GCC-4 bug */ |
| 2870 | if (tmp64 < ran_end) |
| 2871 | cursor.key_end.key = 0x7FFFFFFFFFFFFFFFLL; |
| 2872 | else |
| 2873 | cursor.key_end.key = ran_end + MAXPHYS + 1; |
| 2874 | |
| 2875 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE; |
| 2876 | |
| 2877 | error = hammer_ip_first(&cursor); |
| 2878 | base_offset = last_offset = 0; |
| 2879 | base_disk_offset = last_disk_offset = 0; |
| 2880 | |
| 2881 | while (error == 0) { |
| 2882 | /* |
| 2883 | * Get the base file offset of the record. The key for |
| 2884 | * data records is (base + bytes) rather then (base). |
| 2885 | * |
| 2886 | * NOTE: rec_offset + rec_len may exceed the end-of-file. |
| 2887 | * The extra bytes should be zero on-disk and the BMAP op |
| 2888 | * should still be ok. |
| 2889 | */ |
| 2890 | base = &cursor.leaf->base; |
| 2891 | rec_offset = base->key - cursor.leaf->data_len; |
| 2892 | rec_len = cursor.leaf->data_len; |
| 2893 | |
| 2894 | /* |
| 2895 | * Incorporate any cached truncation. |
| 2896 | * |
| 2897 | * NOTE: Modifications to rec_len based on synthesized |
| 2898 | * truncation points remove the guarantee that any extended |
| 2899 | * data on disk is zero (since the truncations may not have |
| 2900 | * taken place on-media yet). |
| 2901 | */ |
| 2902 | if (ip->flags & HAMMER_INODE_TRUNCATED) { |
| 2903 | if (hammer_cursor_ondisk(&cursor) || |
| 2904 | cursor.iprec->flush_state == HAMMER_FST_FLUSH) { |
| 2905 | if (ip->trunc_off <= rec_offset) |
| 2906 | rec_len = 0; |
| 2907 | else if (ip->trunc_off < rec_offset + rec_len) |
| 2908 | rec_len = (int)(ip->trunc_off - rec_offset); |
| 2909 | } |
| 2910 | } |
| 2911 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 2912 | if (hammer_cursor_ondisk(&cursor)) { |
| 2913 | if (ip->sync_trunc_off <= rec_offset) |
| 2914 | rec_len = 0; |
| 2915 | else if (ip->sync_trunc_off < rec_offset + rec_len) |
| 2916 | rec_len = (int)(ip->sync_trunc_off - rec_offset); |
| 2917 | } |
| 2918 | } |
| 2919 | |
| 2920 | /* |
| 2921 | * Accumulate information. If we have hit a discontiguous |
| 2922 | * block reset base_offset unless we are already beyond the |
| 2923 | * requested offset. If we are, that's it, we stop. |
| 2924 | */ |
| 2925 | if (error) |
| 2926 | break; |
| 2927 | if (hammer_cursor_ondisk(&cursor)) { |
| 2928 | disk_offset = cursor.leaf->data_offset; |
| 2929 | if (rec_offset != last_offset || |
| 2930 | disk_offset != last_disk_offset) { |
| 2931 | if (rec_offset > ap->a_loffset) |
| 2932 | break; |
| 2933 | base_offset = rec_offset; |
| 2934 | base_disk_offset = disk_offset; |
| 2935 | } |
| 2936 | last_offset = rec_offset + rec_len; |
| 2937 | last_disk_offset = disk_offset + rec_len; |
| 2938 | } |
| 2939 | error = hammer_ip_next(&cursor); |
| 2940 | } |
| 2941 | |
| 2942 | #if 0 |
| 2943 | kprintf("BMAP %016llx: %016llx - %016llx\n", |
| 2944 | (long long)ap->a_loffset, |
| 2945 | (long long)base_offset, |
| 2946 | (long long)last_offset); |
| 2947 | kprintf("BMAP %16s: %016llx - %016llx\n", "", |
| 2948 | (long long)base_disk_offset, |
| 2949 | (long long)last_disk_offset); |
| 2950 | #endif |
| 2951 | |
| 2952 | if (cursor.node) { |
| 2953 | hammer_cache_node(&ip->cache[1], cursor.node); |
| 2954 | #if 0 |
| 2955 | kprintf("bmap_end2 %016llx ip->cache %p\n", |
| 2956 | (long long)ap->a_loffset, ip->cache[1]); |
| 2957 | #endif |
| 2958 | } |
| 2959 | hammer_done_cursor(&cursor); |
| 2960 | hammer_done_transaction(&trans); |
| 2961 | |
| 2962 | /* |
| 2963 | * If we couldn't find any records or the records we did find were |
| 2964 | * all behind the requested offset, return failure. A forward |
| 2965 | * truncation can leave a hole w/ no on-disk records. |
| 2966 | */ |
| 2967 | if (last_offset == 0 || last_offset < ap->a_loffset) |
| 2968 | return (EOPNOTSUPP); |
| 2969 | |
| 2970 | /* |
| 2971 | * Figure out the block size at the requested offset and adjust |
| 2972 | * our limits so the cluster_read() does not create inappropriately |
| 2973 | * sized buffer cache buffers. |
| 2974 | */ |
| 2975 | blksize = hammer_blocksize(ap->a_loffset); |
| 2976 | if (hammer_blocksize(base_offset) != blksize) { |
| 2977 | base_offset = hammer_blockdemarc(base_offset, ap->a_loffset); |
| 2978 | } |
| 2979 | if (last_offset != ap->a_loffset && |
| 2980 | hammer_blocksize(last_offset - 1) != blksize) { |
| 2981 | last_offset = hammer_blockdemarc(ap->a_loffset, |
| 2982 | last_offset - 1); |
| 2983 | } |
| 2984 | |
| 2985 | /* |
| 2986 | * Returning EOPNOTSUPP simply prevents the direct-IO optimization |
| 2987 | * from occuring. |
| 2988 | */ |
| 2989 | disk_offset = base_disk_offset + (ap->a_loffset - base_offset); |
| 2990 | |
| 2991 | if ((disk_offset & HAMMER_OFF_ZONE_MASK) != HAMMER_ZONE_LARGE_DATA) { |
| 2992 | /* |
| 2993 | * Only large-data zones can be direct-IOd |
| 2994 | */ |
| 2995 | error = EOPNOTSUPP; |
| 2996 | } else if ((disk_offset & HAMMER_BUFMASK) || |
| 2997 | (last_offset - ap->a_loffset) < blksize) { |
| 2998 | /* |
| 2999 | * doffsetp is not aligned or the forward run size does |
| 3000 | * not cover a whole buffer, disallow the direct I/O. |
| 3001 | */ |
| 3002 | error = EOPNOTSUPP; |
| 3003 | } else { |
| 3004 | /* |
| 3005 | * We're good. |
| 3006 | */ |
| 3007 | *ap->a_doffsetp = disk_offset; |
| 3008 | if (ap->a_runb) { |
| 3009 | *ap->a_runb = ap->a_loffset - base_offset; |
| 3010 | KKASSERT(*ap->a_runb >= 0); |
| 3011 | } |
| 3012 | if (ap->a_runp) { |
| 3013 | *ap->a_runp = last_offset - ap->a_loffset; |
| 3014 | KKASSERT(*ap->a_runp >= 0); |
| 3015 | } |
| 3016 | error = 0; |
| 3017 | } |
| 3018 | return(error); |
| 3019 | } |
| 3020 | |
| 3021 | /* |
| 3022 | * Write to a regular file. Because this is a strategy call the OS is |
| 3023 | * trying to actually get data onto the media. |
| 3024 | */ |
| 3025 | static |
| 3026 | int |
| 3027 | hammer_vop_strategy_write(struct vop_strategy_args *ap) |
| 3028 | { |
| 3029 | hammer_record_t record; |
| 3030 | hammer_mount_t hmp; |
| 3031 | hammer_inode_t ip; |
| 3032 | struct bio *bio; |
| 3033 | struct buf *bp; |
| 3034 | int blksize; |
| 3035 | int bytes; |
| 3036 | int error; |
| 3037 | |
| 3038 | bio = ap->a_bio; |
| 3039 | bp = bio->bio_buf; |
| 3040 | ip = ap->a_vp->v_data; |
| 3041 | hmp = ip->hmp; |
| 3042 | |
| 3043 | blksize = hammer_blocksize(bio->bio_offset); |
| 3044 | KKASSERT(bp->b_bufsize == blksize); |
| 3045 | |
| 3046 | if (ip->flags & HAMMER_INODE_RO) { |
| 3047 | bp->b_error = EROFS; |
| 3048 | bp->b_flags |= B_ERROR; |
| 3049 | biodone(ap->a_bio); |
| 3050 | return(EROFS); |
| 3051 | } |
| 3052 | |
| 3053 | /* |
| 3054 | * Interlock with inode destruction (no in-kernel or directory |
| 3055 | * topology visibility). If we queue new IO while trying to |
| 3056 | * destroy the inode we can deadlock the vtrunc call in |
| 3057 | * hammer_inode_unloadable_check(). |
| 3058 | * |
| 3059 | * Besides, there's no point flushing a bp associated with an |
| 3060 | * inode that is being destroyed on-media and has no kernel |
| 3061 | * references. |
| 3062 | */ |
| 3063 | if ((ip->flags | ip->sync_flags) & |
| 3064 | (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) { |
| 3065 | bp->b_resid = 0; |
| 3066 | biodone(ap->a_bio); |
| 3067 | return(0); |
| 3068 | } |
| 3069 | |
| 3070 | /* |
| 3071 | * Reserve space and issue a direct-write from the front-end. |
| 3072 | * NOTE: The direct_io code will hammer_bread/bcopy smaller |
| 3073 | * allocations. |
| 3074 | * |
| 3075 | * An in-memory record will be installed to reference the storage |
| 3076 | * until the flusher can get to it. |
| 3077 | * |
| 3078 | * Since we own the high level bio the front-end will not try to |
| 3079 | * do a direct-read until the write completes. |
| 3080 | * |
| 3081 | * NOTE: The only time we do not reserve a full-sized buffers |
| 3082 | * worth of data is if the file is small. We do not try to |
| 3083 | * allocate a fragment (from the small-data zone) at the end of |
| 3084 | * an otherwise large file as this can lead to wildly separated |
| 3085 | * data. |
| 3086 | */ |
| 3087 | KKASSERT((bio->bio_offset & HAMMER_BUFMASK) == 0); |
| 3088 | KKASSERT(bio->bio_offset < ip->ino_data.size); |
| 3089 | if (bio->bio_offset || ip->ino_data.size > HAMMER_BUFSIZE / 2) |
| 3090 | bytes = bp->b_bufsize; |
| 3091 | else |
| 3092 | bytes = ((int)ip->ino_data.size + 15) & ~15; |
| 3093 | |
| 3094 | record = hammer_ip_add_bulk(ip, bio->bio_offset, bp->b_data, |
| 3095 | bytes, &error); |
| 3096 | |
| 3097 | /* |
| 3098 | * B_VFSFLAG1 indicates that a REDO_WRITE entry was generated |
| 3099 | * in hammer_vop_write(). We must flag the record so the proper |
| 3100 | * REDO_TERM_WRITE entry is generated during the flush. |
| 3101 | */ |
| 3102 | if (record) { |
| 3103 | if (bp->b_flags & B_VFSFLAG1) { |
| 3104 | record->flags |= HAMMER_RECF_REDO; |
| 3105 | bp->b_flags &= ~B_VFSFLAG1; |
| 3106 | } |
| 3107 | hammer_io_direct_write(hmp, bio, record); |
| 3108 | if (ip->rsv_recs > 1 && hmp->rsv_recs > hammer_limit_recs) |
| 3109 | hammer_flush_inode(ip, 0); |
| 3110 | } else { |
| 3111 | bp->b_bio2.bio_offset = NOOFFSET; |
| 3112 | bp->b_error = error; |
| 3113 | bp->b_flags |= B_ERROR; |
| 3114 | biodone(ap->a_bio); |
| 3115 | } |
| 3116 | return(error); |
| 3117 | } |
| 3118 | |
| 3119 | /* |
| 3120 | * dounlink - disconnect a directory entry |
| 3121 | * |
| 3122 | * XXX whiteout support not really in yet |
| 3123 | */ |
| 3124 | static int |
| 3125 | hammer_dounlink(hammer_transaction_t trans, struct nchandle *nch, |
| 3126 | struct vnode *dvp, struct ucred *cred, |
| 3127 | int flags, int isdir) |
| 3128 | { |
| 3129 | struct namecache *ncp; |
| 3130 | hammer_inode_t dip; |
| 3131 | hammer_inode_t ip; |
| 3132 | struct hammer_cursor cursor; |
| 3133 | int64_t namekey; |
| 3134 | u_int32_t max_iterations; |
| 3135 | int nlen, error; |
| 3136 | |
| 3137 | /* |
| 3138 | * Calculate the namekey and setup the key range for the scan. This |
| 3139 | * works kinda like a chained hash table where the lower 32 bits |
| 3140 | * of the namekey synthesize the chain. |
| 3141 | * |
| 3142 | * The key range is inclusive of both key_beg and key_end. |
| 3143 | */ |
| 3144 | dip = VTOI(dvp); |
| 3145 | ncp = nch->ncp; |
| 3146 | |
| 3147 | if (dip->flags & HAMMER_INODE_RO) |
| 3148 | return (EROFS); |
| 3149 | |
| 3150 | namekey = hammer_directory_namekey(dip, ncp->nc_name, ncp->nc_nlen, |
| 3151 | &max_iterations); |
| 3152 | retry: |
| 3153 | hammer_init_cursor(trans, &cursor, &dip->cache[1], dip); |
| 3154 | cursor.key_beg.localization = dip->obj_localization + |
| 3155 | hammer_dir_localization(dip); |
| 3156 | cursor.key_beg.obj_id = dip->obj_id; |
| 3157 | cursor.key_beg.key = namekey; |
| 3158 | cursor.key_beg.create_tid = 0; |
| 3159 | cursor.key_beg.delete_tid = 0; |
| 3160 | cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY; |
| 3161 | cursor.key_beg.obj_type = 0; |
| 3162 | |
| 3163 | cursor.key_end = cursor.key_beg; |
| 3164 | cursor.key_end.key += max_iterations; |
| 3165 | cursor.asof = dip->obj_asof; |
| 3166 | cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF; |
| 3167 | |
| 3168 | /* |
| 3169 | * Scan all matching records (the chain), locate the one matching |
| 3170 | * the requested path component. info->last_error contains the |
| 3171 | * error code on search termination and could be 0, ENOENT, or |
| 3172 | * something else. |
| 3173 | * |
| 3174 | * The hammer_ip_*() functions merge in-memory records with on-disk |
| 3175 | * records for the purposes of the search. |
| 3176 | */ |
| 3177 | error = hammer_ip_first(&cursor); |
| 3178 | |
| 3179 | while (error == 0) { |
| 3180 | error = hammer_ip_resolve_data(&cursor); |
| 3181 | if (error) |
| 3182 | break; |
| 3183 | nlen = cursor.leaf->data_len - HAMMER_ENTRY_NAME_OFF; |
| 3184 | KKASSERT(nlen > 0); |
| 3185 | if (ncp->nc_nlen == nlen && |
| 3186 | bcmp(ncp->nc_name, cursor.data->entry.name, nlen) == 0) { |
| 3187 | break; |
| 3188 | } |
| 3189 | error = hammer_ip_next(&cursor); |
| 3190 | } |
| 3191 | |
| 3192 | /* |
| 3193 | * If all is ok we have to get the inode so we can adjust nlinks. |
| 3194 | * To avoid a deadlock with the flusher we must release the inode |
| 3195 | * lock on the directory when acquiring the inode for the entry. |
| 3196 | * |
| 3197 | * If the target is a directory, it must be empty. |
| 3198 | */ |
| 3199 | if (error == 0) { |
| 3200 | hammer_unlock(&cursor.ip->lock); |
| 3201 | ip = hammer_get_inode(trans, dip, cursor.data->entry.obj_id, |
| 3202 | dip->hmp->asof, |
| 3203 | cursor.data->entry.localization, |
| 3204 | 0, &error); |
| 3205 | hammer_lock_sh(&cursor.ip->lock); |
| 3206 | if (error == ENOENT) { |
| 3207 | kprintf("HAMMER: WARNING: Removing " |
| 3208 | "dirent w/missing inode \"%s\"\n" |
| 3209 | "\tobj_id = %016llx\n", |
| 3210 | ncp->nc_name, |
| 3211 | (long long)cursor.data->entry.obj_id); |
| 3212 | error = 0; |
| 3213 | } |
| 3214 | |
| 3215 | /* |
| 3216 | * If isdir >= 0 we validate that the entry is or is not a |
| 3217 | * directory. If isdir < 0 we don't care. |
| 3218 | */ |
| 3219 | if (error == 0 && isdir >= 0 && ip) { |
| 3220 | if (isdir && |
| 3221 | ip->ino_data.obj_type != HAMMER_OBJTYPE_DIRECTORY) { |
| 3222 | error = ENOTDIR; |
| 3223 | } else if (isdir == 0 && |
| 3224 | ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY) { |
| 3225 | error = EISDIR; |
| 3226 | } |
| 3227 | } |
| 3228 | |
| 3229 | /* |
| 3230 | * If we are trying to remove a directory the directory must |
| 3231 | * be empty. |
| 3232 | * |
| 3233 | * The check directory code can loop and deadlock/retry. Our |
| 3234 | * own cursor's node locks must be released to avoid a 3-way |
| 3235 | * deadlock with the flusher if the check directory code |
| 3236 | * blocks. |
| 3237 | * |
| 3238 | * If any changes whatsoever have been made to the cursor |
| 3239 | * set EDEADLK and retry. |
| 3240 | * |
| 3241 | * WARNING: See warnings in hammer_unlock_cursor() |
| 3242 | * function. |
| 3243 | */ |
| 3244 | if (error == 0 && ip && ip->ino_data.obj_type == |
| 3245 | HAMMER_OBJTYPE_DIRECTORY) { |
| 3246 | hammer_unlock_cursor(&cursor); |
| 3247 | error = hammer_ip_check_directory_empty(trans, ip); |
| 3248 | hammer_lock_cursor(&cursor); |
| 3249 | if (cursor.flags & HAMMER_CURSOR_RETEST) { |
| 3250 | kprintf("HAMMER: Warning: avoided deadlock " |
| 3251 | "on rmdir '%s'\n", |
| 3252 | ncp->nc_name); |
| 3253 | error = EDEADLK; |
| 3254 | } |
| 3255 | } |
| 3256 | |
| 3257 | /* |
| 3258 | * Delete the directory entry. |
| 3259 | * |
| 3260 | * WARNING: hammer_ip_del_directory() may have to terminate |
| 3261 | * the cursor to avoid a deadlock. It is ok to call |
| 3262 | * hammer_done_cursor() twice. |
| 3263 | */ |
| 3264 | if (error == 0) { |
| 3265 | error = hammer_ip_del_directory(trans, &cursor, |
| 3266 | dip, ip); |
| 3267 | } |
| 3268 | hammer_done_cursor(&cursor); |
| 3269 | if (error == 0) { |
| 3270 | cache_setunresolved(nch); |
| 3271 | cache_setvp(nch, NULL); |
| 3272 | |
| 3273 | /* |
| 3274 | * XXX locking. Note: ip->vp might get ripped out |
| 3275 | * when we setunresolved() the nch since we had |
| 3276 | * no other reference to it. In that case ip->vp |
| 3277 | * will be NULL. |
| 3278 | */ |
| 3279 | if (ip && ip->vp) { |
| 3280 | hammer_knote(ip->vp, NOTE_DELETE); |
| 3281 | cache_inval_vp(ip->vp, CINV_DESTROY); |
| 3282 | } |
| 3283 | } |
| 3284 | if (ip) |
| 3285 | hammer_rel_inode(ip, 0); |
| 3286 | } else { |
| 3287 | hammer_done_cursor(&cursor); |
| 3288 | } |
| 3289 | if (error == EDEADLK) |
| 3290 | goto retry; |
| 3291 | |
| 3292 | return (error); |
| 3293 | } |
| 3294 | |
| 3295 | /************************************************************************ |
| 3296 | * FIFO AND SPECFS OPS * |
| 3297 | ************************************************************************ |
| 3298 | * |
| 3299 | */ |
| 3300 | |
| 3301 | static int |
| 3302 | hammer_vop_fifoclose (struct vop_close_args *ap) |
| 3303 | { |
| 3304 | /* XXX update itimes */ |
| 3305 | return (VOCALL(&fifo_vnode_vops, &ap->a_head)); |
| 3306 | } |
| 3307 | |
| 3308 | static int |
| 3309 | hammer_vop_fiforead (struct vop_read_args *ap) |
| 3310 | { |
| 3311 | int error; |
| 3312 | |
| 3313 | error = VOCALL(&fifo_vnode_vops, &ap->a_head); |
| 3314 | /* XXX update access time */ |
| 3315 | return (error); |
| 3316 | } |
| 3317 | |
| 3318 | static int |
| 3319 | hammer_vop_fifowrite (struct vop_write_args *ap) |
| 3320 | { |
| 3321 | int error; |
| 3322 | |
| 3323 | error = VOCALL(&fifo_vnode_vops, &ap->a_head); |
| 3324 | /* XXX update access time */ |
| 3325 | return (error); |
| 3326 | } |
| 3327 | |
| 3328 | static |
| 3329 | int |
| 3330 | hammer_vop_fifokqfilter(struct vop_kqfilter_args *ap) |
| 3331 | { |
| 3332 | int error; |
| 3333 | |
| 3334 | error = VOCALL(&fifo_vnode_vops, &ap->a_head); |
| 3335 | if (error) |
| 3336 | error = hammer_vop_kqfilter(ap); |
| 3337 | return(error); |
| 3338 | } |
| 3339 | |
| 3340 | /************************************************************************ |
| 3341 | * KQFILTER OPS * |
| 3342 | ************************************************************************ |
| 3343 | * |
| 3344 | */ |
| 3345 | static void filt_hammerdetach(struct knote *kn); |
| 3346 | static int filt_hammerread(struct knote *kn, long hint); |
| 3347 | static int filt_hammerwrite(struct knote *kn, long hint); |
| 3348 | static int filt_hammervnode(struct knote *kn, long hint); |
| 3349 | |
| 3350 | static struct filterops hammerread_filtops = |
| 3351 | { 1, NULL, filt_hammerdetach, filt_hammerread }; |
| 3352 | static struct filterops hammerwrite_filtops = |
| 3353 | { 1, NULL, filt_hammerdetach, filt_hammerwrite }; |
| 3354 | static struct filterops hammervnode_filtops = |
| 3355 | { 1, NULL, filt_hammerdetach, filt_hammervnode }; |
| 3356 | |
| 3357 | static |
| 3358 | int |
| 3359 | hammer_vop_kqfilter(struct vop_kqfilter_args *ap) |
| 3360 | { |
| 3361 | struct vnode *vp = ap->a_vp; |
| 3362 | struct knote *kn = ap->a_kn; |
| 3363 | |
| 3364 | switch (kn->kn_filter) { |
| 3365 | case EVFILT_READ: |
| 3366 | kn->kn_fop = &hammerread_filtops; |
| 3367 | break; |
| 3368 | case EVFILT_WRITE: |
| 3369 | kn->kn_fop = &hammerwrite_filtops; |
| 3370 | break; |
| 3371 | case EVFILT_VNODE: |
| 3372 | kn->kn_fop = &hammervnode_filtops; |
| 3373 | break; |
| 3374 | default: |
| 3375 | return (1); |
| 3376 | } |
| 3377 | |
| 3378 | kn->kn_hook = (caddr_t)vp; |
| 3379 | |
| 3380 | lwkt_gettoken(&vp->v_token); |
| 3381 | SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext); |
| 3382 | lwkt_reltoken(&vp->v_token); |
| 3383 | |
| 3384 | return(0); |
| 3385 | } |
| 3386 | |
| 3387 | static void |
| 3388 | filt_hammerdetach(struct knote *kn) |
| 3389 | { |
| 3390 | struct vnode *vp = (void *)kn->kn_hook; |
| 3391 | |
| 3392 | lwkt_gettoken(&vp->v_token); |
| 3393 | SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note, |
| 3394 | kn, knote, kn_selnext); |
| 3395 | lwkt_reltoken(&vp->v_token); |
| 3396 | } |
| 3397 | |
| 3398 | static int |
| 3399 | filt_hammerread(struct knote *kn, long hint) |
| 3400 | { |
| 3401 | struct vnode *vp = (void *)kn->kn_hook; |
| 3402 | hammer_inode_t ip = VTOI(vp); |
| 3403 | |
| 3404 | if (hint == NOTE_REVOKE) { |
| 3405 | kn->kn_flags |= (EV_EOF | EV_ONESHOT); |
| 3406 | return(1); |
| 3407 | } |
| 3408 | kn->kn_data = ip->ino_data.size - kn->kn_fp->f_offset; |
| 3409 | return (kn->kn_data != 0); |
| 3410 | } |
| 3411 | |
| 3412 | static int |
| 3413 | filt_hammerwrite(struct knote *kn, long hint) |
| 3414 | { |
| 3415 | if (hint == NOTE_REVOKE) |
| 3416 | kn->kn_flags |= (EV_EOF | EV_ONESHOT); |
| 3417 | kn->kn_data = 0; |
| 3418 | return (1); |
| 3419 | } |
| 3420 | |
| 3421 | static int |
| 3422 | filt_hammervnode(struct knote *kn, long hint) |
| 3423 | { |
| 3424 | if (kn->kn_sfflags & hint) |
| 3425 | kn->kn_fflags |= hint; |
| 3426 | if (hint == NOTE_REVOKE) { |
| 3427 | kn->kn_flags |= EV_EOF; |
| 3428 | return (1); |
| 3429 | } |
| 3430 | return (kn->kn_fflags != 0); |
| 3431 | } |
| 3432 | |