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1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22 /* @(#)hfs_readwrite.c 1.0
23 *
24 * (c) 1990, 1992 NeXT Computer, Inc. All Rights Reserved
25 * (c) 1998 Apple Computer, Inc. All Rights Reserved
26 *
27 *
28 * hfs_readwrite.c -- vnode operations to deal with reading and writing files.
29 *
30 * MODIFICATION HISTORY:
31 * 9-Nov-1999 Scott Roberts hfs_allocate now returns sizes based on allocation block boundaries (#2398794)
32 * 3-Feb-1999 Pat Dirks Merged in Joe's change to hfs_truncate to skip vinvalbuf if LEOF isn't changing (#2302796)
33 * Removed superfluous (and potentially dangerous) second call to vinvalbuf() in hfs_truncate.
34 * 2-Dec-1998 Pat Dirks Added support for read/write bootstrap ioctls.
35 * 10-Nov-1998 Pat Dirks Changed read/write/truncate logic to optimize block sizes for first extents of a file.
36 * Changed hfs_strategy to correct I/O sizes from cluser code I/O requests in light of
37 * different block sizing. Changed bexpand to handle RELEASE_BUFFER flag.
38 * 22-Sep-1998 Don Brady Changed truncate zero-fill to use bwrite after several bawrites have been queued.
39 * 11-Sep-1998 Pat Dirks Fixed buffering logic to not rely on B_CACHE, which is set for empty buffers that
40 * have been pre-read by cluster_read (use b_validend > 0 instead).
41 * 27-Aug-1998 Pat Dirks Changed hfs_truncate to use cluster_write in place of bawrite where possible.
42 * 25-Aug-1998 Pat Dirks Changed hfs_write to do small device-block aligned writes into buffers without doing
43 * read-ahead of the buffer. Added bexpand to deal with incomplete [dirty] buffers.
44 * Fixed can_cluster macro to use MAXPHYSIO instead of MAXBSIZE.
45 * 19-Aug-1998 Don Brady Remove optimization in hfs_truncate that prevented extra physical blocks from
46 * being truncated (radar #2265750). Also set fcb->fcbEOF before calling vinvalbuf.
47 * 7-Jul-1998 Pat Dirks Added code to honor IO_NOZEROFILL in hfs_truncate.
48 * 16-Jul-1998 Don Brady In hfs_bmap use MAXPHYSIO instead of MAXBSIZE when calling MapFileBlockC (radar #2263753).
49 * 16-Jul-1998 Don Brady Fix error handling in hfs_allocate (radar #2252265).
50 * 04-Jul-1998 chw Synchronized options in hfs_allocate with flags in call to ExtendFileC
51 * 25-Jun-1998 Don Brady Add missing blockNo incrementing to zero fill loop in hfs_truncate.
52 * 22-Jun-1998 Don Brady Add bp = NULL assignment after brelse in hfs_read.
53 * 4-Jun-1998 Pat Dirks Split off from hfs_vnodeops.c
54 */
55
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/resourcevar.h>
59 #include <sys/kernel.h>
60 #include <sys/fcntl.h>
61 #include <sys/stat.h>
62 #include <sys/buf.h>
63 #include <sys/proc.h>
64 //#include <mach/machine/vm_types.h>
65 #include <sys/vnode.h>
66 #include <sys/uio.h>
67
68 #include <miscfs/specfs/specdev.h>
69
70 #include <sys/ubc.h>
71 #include <vm/vm_pageout.h>
72
73 #include <sys/kdebug.h>
74
75 #include "hfs.h"
76 #include "hfs_dbg.h"
77 #include "hfs_endian.h"
78 #include "hfscommon/headers/FileMgrInternal.h"
79 #include "hfscommon/headers/BTreesInternal.h"
80
81
82 #define can_cluster(size) ((((size & (4096-1))) == 0) && (size <= (MAXPHYSIO/2)))
83
84 enum {
85 MAXHFSFILESIZE = 0x7FFFFFFF /* this needs to go in the mount structure */
86 };
87
88 extern u_int32_t GetLogicalBlockSize(struct vnode *vp);
89
90 #if DBG_VOP_TEST_LOCKS
91 extern void DbgVopTest(int maxSlots, int retval, VopDbgStoreRec *VopDbgStore, char *funcname);
92 #endif
93
94 #if HFS_DIAGNOSTIC
95 void debug_check_blocksizes(struct vnode *vp);
96 #endif
97
98 /*****************************************************************************
99 *
100 * Operations on vnodes
101 *
102 *****************************************************************************/
103
104 /*
105 #% read vp L L L
106 #
107 vop_read {
108 IN struct vnode *vp;
109 INOUT struct uio *uio;
110 IN int ioflag;
111 IN struct ucred *cred;
112
113 */
114
115 int
116 hfs_read(ap)
117 struct vop_read_args /* {
118 struct vnode *a_vp;
119 struct uio *a_uio;
120 int a_ioflag;
121 struct ucred *a_cred;
122 } */ *ap;
123 {
124 register struct vnode *vp;
125 struct hfsnode *hp;
126 register struct uio *uio;
127 struct buf *bp;
128 daddr_t logBlockNo;
129 u_long fragSize, moveSize, startOffset, ioxfersize;
130 int devBlockSize = 0;
131 off_t bytesRemaining;
132 int retval;
133 u_short mode;
134 FCB *fcb;
135
136 DBG_FUNC_NAME("hfs_read");
137 DBG_VOP_LOCKS_DECL(1);
138 DBG_VOP_PRINT_FUNCNAME();
139 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
140 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
141
142 vp = ap->a_vp;
143 hp = VTOH(vp);
144 fcb = HTOFCB(hp);
145 mode = hp->h_meta->h_mode;
146 uio = ap->a_uio;
147
148 #if HFS_DIAGNOSTIC
149 if (uio->uio_rw != UIO_READ)
150 panic("%s: mode", funcname);
151 #endif
152
153 /* Can only read files */
154 if (ap->a_vp->v_type != VREG && ap->a_vp->v_type != VLNK) {
155 DBG_VOP_LOCKS_TEST(EISDIR);
156 return (EISDIR);
157 }
158 DBG_RW(("\tfile size Ox%X\n", (u_int)fcb->fcbEOF));
159 DBG_RW(("\tstarting at offset Ox%X of file, length Ox%X\n", (u_int)uio->uio_offset, (u_int)uio->uio_resid));
160
161 #if HFS_DIAGNOSTIC
162 debug_check_blocksizes(vp);
163 #endif
164
165 /*
166 * If they didn't ask for any data, then we are done.
167 */
168 if (uio->uio_resid == 0) {
169 DBG_VOP_LOCKS_TEST(E_NONE);
170 return (E_NONE);
171 }
172
173 /* cant read from a negative offset */
174 if (uio->uio_offset < 0) {
175 DBG_VOP_LOCKS_TEST(EINVAL);
176 return (EINVAL);
177 }
178
179 if (uio->uio_offset > fcb->fcbEOF) {
180 if ( (!ISHFSPLUS(VTOVCB(vp))) && (uio->uio_offset > (off_t)MAXHFSFILESIZE))
181 retval = EFBIG;
182 else
183 retval = E_NONE;
184
185 DBG_VOP_LOCKS_TEST(retval);
186 return (retval);
187 }
188
189 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
190
191 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 12)) | DBG_FUNC_START,
192 (int)uio->uio_offset, uio->uio_resid, (int)fcb->fcbEOF, (int)fcb->fcbPLen, 0);
193
194 if (UBCISVALID(vp))
195 retval = cluster_read(vp, uio, (off_t)fcb->fcbEOF, devBlockSize, 0);
196 else {
197
198 for (retval = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
199
200 if ((bytesRemaining = (fcb->fcbEOF - uio->uio_offset)) <= 0)
201 break;
202
203 logBlockNo = (daddr_t)(uio->uio_offset / PAGE_SIZE_64);
204 startOffset = (u_long) (uio->uio_offset & PAGE_MASK_64);
205 fragSize = PAGE_SIZE;
206
207 if (((logBlockNo * PAGE_SIZE) + fragSize) < fcb->fcbEOF)
208 ioxfersize = fragSize;
209 else {
210 ioxfersize = fcb->fcbEOF - (logBlockNo * PAGE_SIZE);
211 ioxfersize = (ioxfersize + (devBlockSize - 1)) & ~(devBlockSize - 1);
212 }
213 DBG_RW(("\tat logBlockNo Ox%X, with Ox%lX left to read\n", logBlockNo, (UInt32)uio->uio_resid));
214 moveSize = ioxfersize;
215 DBG_RW(("\tmoveSize = Ox%lX; ioxfersize = Ox%lX; startOffset = Ox%lX.\n",
216 moveSize, ioxfersize, startOffset));
217 DBG_ASSERT(moveSize >= startOffset);
218 moveSize -= startOffset;
219
220 if (bytesRemaining < moveSize)
221 moveSize = bytesRemaining;
222
223 if (uio->uio_resid < moveSize) {
224 moveSize = uio->uio_resid;
225 DBG_RW(("\treducing moveSize to Ox%lX (uio->uio_resid).\n", moveSize));
226 };
227 if (moveSize == 0) {
228 break;
229 };
230
231 DBG_RW(("\tat logBlockNo Ox%X, extent of Ox%lX, xfer of Ox%lX; moveSize = Ox%lX\n", logBlockNo, fragSize, ioxfersize, moveSize));
232
233 if (( uio->uio_offset + fragSize) >= fcb->fcbEOF) {
234 retval = bread(vp, logBlockNo, ioxfersize, NOCRED, &bp);
235
236 } else if (logBlockNo - 1 == vp->v_lastr && !(vp->v_flag & VRAOFF)) {
237 daddr_t nextLogBlockNo = logBlockNo + 1;
238 int nextsize;
239
240 if (((nextLogBlockNo * PAGE_SIZE) +
241 (daddr_t)fragSize) < fcb->fcbEOF)
242 nextsize = fragSize;
243 else {
244 nextsize = fcb->fcbEOF - (nextLogBlockNo * PAGE_SIZE);
245 nextsize = (nextsize + (devBlockSize - 1)) & ~(devBlockSize - 1);
246 }
247 retval = breadn(vp, logBlockNo, ioxfersize, &nextLogBlockNo, &nextsize, 1, NOCRED, &bp);
248 } else {
249 retval = bread(vp, logBlockNo, ioxfersize, NOCRED, &bp);
250 };
251
252 if (retval != E_NONE) {
253 if (bp) {
254 brelse(bp);
255 bp = NULL;
256 }
257 break;
258 };
259 vp->v_lastr = logBlockNo;
260
261 /*
262 * We should only get non-zero b_resid when an I/O retval
263 * has occurred, which should cause us to break above.
264 * However, if the short read did not cause an retval,
265 * then we want to ensure that we do not uiomove bad
266 * or uninitialized data.
267 */
268 ioxfersize -= bp->b_resid;
269
270 if (ioxfersize < moveSize) { /* XXX PPD This should take the offset into account, too! */
271 if (ioxfersize == 0)
272 break;
273 moveSize = ioxfersize;
274 }
275 if ((startOffset + moveSize) > bp->b_bcount)
276 panic("hfs_read: bad startOffset or moveSize\n");
277
278 DBG_RW(("\tcopying Ox%lX bytes from %lX; resid = Ox%lX...\n", moveSize, (char *)bp->b_data + startOffset, bp->b_resid));
279
280 if ((retval = uiomove((caddr_t)bp->b_data + startOffset, (int)moveSize, uio)))
281 break;
282
283 if (S_ISREG(mode) &&
284 (((startOffset + moveSize) == fragSize) || (uio->uio_offset == fcb->fcbEOF))) {
285 bp->b_flags |= B_AGE;
286 };
287
288 DBG_ASSERT(bp->b_bcount == bp->b_validend);
289
290 brelse(bp);
291 /* Start of loop resets bp to NULL before reaching outside this block... */
292 }
293
294 if (bp != NULL) {
295 DBG_ASSERT(bp->b_bcount == bp->b_validend);
296 brelse(bp);
297 };
298 }
299
300 if (HTOVCB(hp)->vcbSigWord == kHFSPlusSigWord)
301 hp->h_nodeflags |= IN_ACCESS;
302
303 DBG_VOP_LOCKS_TEST(retval);
304
305 #if HFS_DIAGNOSTIC
306 debug_check_blocksizes(vp);
307 #endif
308
309 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 12)) | DBG_FUNC_END,
310 (int)uio->uio_offset, uio->uio_resid, (int)fcb->fcbEOF, (int)fcb->fcbPLen, 0);
311
312 return (retval);
313 }
314
315 /*
316 * Write data to a file or directory.
317 #% write vp L L L
318 #
319 vop_write {
320 IN struct vnode *vp;
321 INOUT struct uio *uio;
322 IN int ioflag;
323 IN struct ucred *cred;
324
325 */
326 int
327 hfs_write(ap)
328 struct vop_write_args /* {
329 struct vnode *a_vp;
330 struct uio *a_uio;
331 int a_ioflag;
332 struct ucred *a_cred;
333 } */ *ap;
334 {
335 struct hfsnode *hp = VTOH(ap->a_vp);
336 struct uio *uio = ap->a_uio;
337 struct vnode *vp = ap->a_vp ;
338 struct vnode *dev;
339 struct buf *bp;
340 struct proc *p, *cp;
341 struct timeval tv;
342 FCB *fcb = HTOFCB(hp);
343 ExtendedVCB *vcb = HTOVCB(hp);
344 int devBlockSize = 0;
345 daddr_t logBlockNo;
346 long fragSize;
347 off_t origFileSize, currOffset, writelimit, bytesToAdd;
348 off_t actualBytesAdded;
349 u_long blkoffset, resid, xfersize, clearSize;
350 int flags, ioflag;
351 int retval;
352 DBG_FUNC_NAME("hfs_write");
353 DBG_VOP_LOCKS_DECL(1);
354 DBG_VOP_PRINT_FUNCNAME();
355 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
356 DBG_RW(("\thfsnode 0x%x (%s)\n", (u_int)hp, H_NAME(hp)));
357 DBG_RW(("\tstarting at offset Ox%lX of file, length Ox%lX\n", (UInt32)uio->uio_offset, (UInt32)uio->uio_resid));
358
359 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
360
361 dev = hp->h_meta->h_devvp;
362
363 #if HFS_DIAGNOSTIC
364 debug_check_blocksizes(vp);
365 #endif
366
367 if (uio->uio_offset < 0) {
368 DBG_VOP_LOCKS_TEST(EINVAL);
369 return (EINVAL);
370 }
371
372 if (uio->uio_resid == 0) {
373 DBG_VOP_LOCKS_TEST(E_NONE);
374 return (E_NONE);
375 }
376
377 if (ap->a_vp->v_type != VREG && ap->a_vp->v_type != VLNK) { /* Can only write files */
378 DBG_VOP_LOCKS_TEST(EISDIR);
379 return (EISDIR);
380 };
381
382 #if HFS_DIAGNOSTIC
383 if (uio->uio_rw != UIO_WRITE)
384 panic("%s: mode", funcname);
385 #endif
386
387 ioflag = ap->a_ioflag;
388 uio = ap->a_uio;
389 vp = ap->a_vp;
390
391 if (ioflag & IO_APPEND) uio->uio_offset = fcb->fcbEOF;
392 if ((hp->h_meta->h_pflags & APPEND) && uio->uio_offset != fcb->fcbEOF)
393 return (EPERM);
394
395 writelimit = uio->uio_offset + uio->uio_resid;
396
397 /*
398 * Maybe this should be above the vnode op call, but so long as
399 * file servers have no limits, I don't think it matters.
400 */
401 p = uio->uio_procp;
402 if (vp->v_type == VREG && p &&
403 writelimit > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
404 psignal(p, SIGXFSZ);
405 return (EFBIG);
406 };
407 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
408
409 resid = uio->uio_resid;
410 origFileSize = fcb->fcbEOF;
411 flags = ioflag & IO_SYNC ? B_SYNC : 0;
412
413 DBG_RW(("\tLEOF is 0x%lX, PEOF is 0x%lX.\n", fcb->fcbEOF, fcb->fcbPLen));
414
415 /*
416 NOTE: In the following loop there are two positions tracked:
417 currOffset is the current I/O starting offset. currOffset is never >LEOF; the
418 LEOF is nudged along with currOffset as data is zeroed or written.
419 uio->uio_offset is the start of the current I/O operation. It may be arbitrarily
420 beyond currOffset.
421
422 The following is true at all times:
423
424 currOffset <= LEOF <= uio->uio_offset <= writelimit
425 */
426 currOffset = MIN(uio->uio_offset, fcb->fcbEOF);
427
428 DBG_RW(("\tstarting I/O loop at 0x%lX.\n", (u_long)currOffset));
429
430 cp = current_proc();
431
432 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 0)) | DBG_FUNC_START,
433 (int)uio->uio_offset, uio->uio_resid, (int)fcb->fcbEOF, (int)fcb->fcbPLen, 0);
434 retval = 0;
435
436 /* Now test if we need to extend the file */
437 /* Doing so will adjust the fcbPLen for us */
438
439 while (writelimit > (off_t)fcb->fcbPLen) {
440
441 bytesToAdd = writelimit - fcb->fcbPLen;
442 DBG_RW(("\textending file by 0x%lX bytes; 0x%lX blocks free",
443 (unsigned long)bytesToAdd, (unsigned long)vcb->freeBlocks));
444
445 /* lock extents b-tree (also protects volume bitmap) */
446 retval = hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_EXCLUSIVE, cp);
447 if (retval != E_NONE)
448 break;
449
450 retval = MacToVFSError(
451 ExtendFileC (vcb,
452 fcb,
453 bytesToAdd,
454 0,
455 kEFContigBit,
456 &actualBytesAdded));
457
458 (void) hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_RELEASE, cp);
459 DBG_VOP_CONT(("\tactual bytes added = 0x%lX bytes, retval = %d...\n", actualBytesAdded, retval));
460 if ((actualBytesAdded == 0) && (retval == E_NONE)) retval = ENOSPC;
461 if (retval != E_NONE) break;
462
463 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 0)) | DBG_FUNC_NONE,
464 (int)uio->uio_offset, uio->uio_resid, (int)fcb->fcbEOF, (int)fcb->fcbPLen, 0);
465 };
466
467 if (UBCISVALID(vp) && retval == E_NONE) {
468 off_t filesize;
469 off_t zero_off;
470 off_t tail_off;
471 off_t inval_start;
472 off_t inval_end;
473 off_t io_start, io_end;
474 int lflag;
475 struct rl_entry *invalid_range;
476
477 if (writelimit > fcb->fcbEOF)
478 filesize = writelimit;
479 else
480 filesize = fcb->fcbEOF;
481
482 lflag = (ioflag & IO_SYNC);
483
484 if (uio->uio_offset <= fcb->fcbEOF) {
485 zero_off = uio->uio_offset & ~PAGE_MASK_64;
486
487 /* Check to see whether the area between the zero_offset and the start
488 of the transfer to see whether is invalid and should be zero-filled
489 as part of the transfer:
490 */
491 if (rl_scan(&hp->h_invalidranges, zero_off, uio->uio_offset - 1, &invalid_range) != RL_NOOVERLAP) {
492 lflag |= IO_HEADZEROFILL;
493 };
494 } else {
495 off_t eof_page_base = fcb->fcbEOF & ~PAGE_MASK_64;
496
497 /* The bytes between fcb->fcbEOF and uio->uio_offset must never be
498 read without being zeroed. The current last block is filled with zeroes
499 if it holds valid data but in all cases merely do a little bookkeeping
500 to track the area from the end of the current last page to the start of
501 the area actually written. For the same reason only the bytes up to the
502 start of the page where this write will start is invalidated; any remainder
503 before uio->uio_offset is explicitly zeroed as part of the cluster_write.
504
505 Note that inval_start, the start of the page after the current EOF,
506 may be past the start of the write, in which case the zeroing
507 will be handled by the cluser_write of the actual data.
508 */
509 inval_start = (fcb->fcbEOF + (PAGE_SIZE_64 - 1)) & ~PAGE_MASK_64;
510 inval_end = uio->uio_offset & ~PAGE_MASK_64;
511 zero_off = fcb->fcbEOF;
512
513 if ((fcb->fcbEOF & PAGE_MASK_64) &&
514 (rl_scan(&hp->h_invalidranges,
515 eof_page_base,
516 fcb->fcbEOF - 1,
517 &invalid_range) != RL_NOOVERLAP)) {
518 /* The page containing the EOF is not valid, so the
519 entire page must be made inaccessible now. If the write
520 starts on a page beyond the page containing the eof
521 (inval_end > eof_page_base), add the
522 whole page to the range to be invalidated. Otherwise
523 (i.e. if the write starts on the same page), zero-fill
524 the entire page explicitly now:
525 */
526 if (inval_end > eof_page_base) {
527 inval_start = eof_page_base;
528 } else {
529 zero_off = eof_page_base;
530 };
531 };
532
533 if (inval_start < inval_end) {
534 /* There's some range of data that's going to be marked invalid */
535
536 if (zero_off < inval_start) {
537 /* The pages between inval_start and inval_end are going to be invalidated,
538 and the actual write will start on a page past inval_end. Now's the last
539 chance to zero-fill the page containing the EOF:
540 */
541 retval = cluster_write(vp, (struct uio *) 0, fcb->fcbEOF, inval_start,
542 zero_off, (off_t)0, devBlockSize, lflag | IO_HEADZEROFILL);
543 if (retval) goto ioerr_exit;
544 };
545
546 /* Mark the remaining area of the newly allocated space as invalid: */
547 rl_add(inval_start, inval_end - 1 , &hp->h_invalidranges);
548 zero_off = fcb->fcbEOF = inval_end;
549 };
550
551 if (uio->uio_offset > zero_off) lflag |= IO_HEADZEROFILL;
552 };
553
554 /* Check to see whether the area between the end of the write and the end of
555 the page it falls in is invalid and should be zero-filled as part of the transfer:
556 */
557 tail_off = (writelimit + (PAGE_SIZE_64 - 1)) & ~PAGE_MASK_64;
558 if (tail_off > filesize) tail_off = filesize;
559 if (tail_off > writelimit) {
560 if (rl_scan(&hp->h_invalidranges, writelimit, tail_off - 1, &invalid_range) != RL_NOOVERLAP) {
561 lflag |= IO_TAILZEROFILL;
562 };
563 };
564
565 /*
566 * if the write starts beyond the current EOF (possibly advanced in the
567 * zeroing of the last block, above), then we'll zero fill from the current EOF
568 * to where the write begins:
569 *
570 * NOTE: If (and ONLY if) the portion of the file about to be written is
571 * before the current EOF it might be marked as invalid now and must be
572 * made readable (removed from the invalid ranges) before cluster_write
573 * tries to write it:
574 */
575 io_start = (lflag & IO_HEADZEROFILL) ? zero_off : uio->uio_offset;
576 io_end = (lflag & IO_TAILZEROFILL) ? tail_off : writelimit;
577 if (io_start < fcb->fcbEOF) {
578 rl_remove(io_start, io_end - 1, &hp->h_invalidranges);
579 };
580 retval = cluster_write(vp, uio, fcb->fcbEOF, filesize, zero_off, tail_off, devBlockSize, lflag);
581
582 if (uio->uio_offset > fcb->fcbEOF) {
583 fcb->fcbEOF = uio->uio_offset;
584
585 ubc_setsize(vp, (off_t)fcb->fcbEOF); /* XXX check errors */
586 }
587 if (resid > uio->uio_resid) hp->h_nodeflags |= IN_CHANGE | IN_UPDATE;
588
589 } else {
590
591 while (retval == E_NONE && uio->uio_resid > 0) {
592 logBlockNo = currOffset / PAGE_SIZE;
593 blkoffset = currOffset & PAGE_MASK;
594
595 if (((off_t)(fcb->fcbPLen) - currOffset) < PAGE_SIZE_64)
596 fragSize = (off_t)(fcb->fcbPLen) - ((off_t)logBlockNo * PAGE_SIZE_64);
597 else
598 fragSize = PAGE_SIZE;
599 xfersize = fragSize - blkoffset;
600
601 DBG_RW(("\tcurrOffset = Ox%lX, logBlockNo = Ox%X, blkoffset = Ox%lX, xfersize = Ox%lX, fragSize = Ox%lX.\n",
602 (unsigned long)currOffset, logBlockNo, blkoffset, xfersize, fragSize));
603
604 /* Make any adjustments for boundary conditions */
605 if (currOffset + (off_t)xfersize > writelimit) {
606 xfersize = writelimit - currOffset;
607 DBG_RW(("\ttrimming xfersize to 0x%lX to match writelimit (uio_resid)...\n", xfersize));
608 };
609
610 /*
611 * There is no need to read into bp if:
612 * We start on a block boundary and will overwrite the whole block
613 *
614 * OR
615 */
616 if ((blkoffset == 0) && (xfersize >= fragSize)) {
617 DBG_RW(("\tRequesting %ld-byte block Ox%lX w/o read...\n", fragSize, (long)logBlockNo));
618
619 bp = getblk(vp, logBlockNo, fragSize, 0, 0, BLK_READ);
620 retval = 0;
621
622 if (bp->b_blkno == -1) {
623 brelse(bp);
624 retval = EIO; /* XXX */
625 break;
626 }
627 } else {
628
629 if (currOffset == fcb->fcbEOF && blkoffset == 0) {
630 bp = getblk(vp, logBlockNo, fragSize, 0, 0, BLK_READ);
631 retval = 0;
632
633 if (bp->b_blkno == -1) {
634 brelse(bp);
635 retval = EIO; /* XXX */
636 break;
637 }
638
639 } else {
640 /*
641 * This I/O transfer is not sufficiently aligned, so read the affected block into a buffer:
642 */
643 DBG_VOP(("\tRequesting block Ox%X, size = 0x%08lX...\n", logBlockNo, fragSize));
644 retval = bread(vp, logBlockNo, fragSize, ap->a_cred, &bp);
645
646 if (retval != E_NONE) {
647 if (bp)
648 brelse(bp);
649 break;
650 }
651 }
652 }
653
654 /* See if we are starting to write within file boundaries:
655 If not, then we need to present a "hole" for the area between
656 the current EOF and the start of the current I/O operation:
657
658 Note that currOffset is only less than uio_offset if uio_offset > LEOF...
659 */
660 if (uio->uio_offset > currOffset) {
661 clearSize = MIN(uio->uio_offset - currOffset, xfersize);
662 DBG_RW(("\tzeroing Ox%lX bytes Ox%lX bytes into block Ox%X...\n", clearSize, blkoffset, logBlockNo));
663 bzero(bp->b_data + blkoffset, clearSize);
664 currOffset += clearSize;
665 blkoffset += clearSize;
666 xfersize -= clearSize;
667 };
668
669 if (xfersize > 0) {
670 DBG_RW(("\tCopying Ox%lX bytes Ox%lX bytes into block Ox%X... ioflag == 0x%X\n",
671 xfersize, blkoffset, logBlockNo, ioflag));
672 retval = uiomove((caddr_t)bp->b_data + blkoffset, (int)xfersize, uio);
673 currOffset += xfersize;
674 };
675 DBG_ASSERT((bp->b_bcount % devBlockSize) == 0);
676
677 if (ioflag & IO_SYNC) {
678 (void)VOP_BWRITE(bp);
679 //DBG_RW(("\tissuing bwrite\n"));
680 } else if ((xfersize + blkoffset) == fragSize) {
681 //DBG_RW(("\tissuing bawrite\n"));
682 bp->b_flags |= B_AGE;
683 bawrite(bp);
684 } else {
685 //DBG_RW(("\tissuing bdwrite\n"));
686 bdwrite(bp);
687 };
688
689 /* Update the EOF if we just extended the file
690 (the PEOF has already been moved out and the block mapping table has been updated): */
691 if (currOffset > fcb->fcbEOF) {
692 DBG_VOP(("\textending EOF to 0x%lX...\n", (UInt32)fcb->fcbEOF));
693 fcb->fcbEOF = currOffset;
694
695 if (UBCISVALID(vp))
696 ubc_setsize(vp, (off_t)fcb->fcbEOF); /* XXX check errors */
697 };
698
699 if (retval || (resid == 0))
700 break;
701 hp->h_nodeflags |= IN_CHANGE | IN_UPDATE;
702 };
703 };
704
705 ioerr_exit:
706 /*
707 * If we successfully wrote any data, and we are not the superuser
708 * we clear the setuid and setgid bits as a precaution against
709 * tampering.
710 */
711 if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0)
712 hp->h_meta->h_mode &= ~(ISUID | ISGID);
713
714 if (retval) {
715 if (ioflag & IO_UNIT) {
716 (void)VOP_TRUNCATE(vp, origFileSize,
717 ioflag & IO_SYNC, ap->a_cred, uio->uio_procp);
718 uio->uio_offset -= resid - uio->uio_resid;
719 uio->uio_resid = resid;
720 }
721 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) {
722 tv = time;
723 retval = VOP_UPDATE(vp, &tv, &tv, 1);
724 }
725
726 #if HFS_DIAGNOSTIC
727 debug_check_blocksizes(vp);
728 #endif
729
730 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 0)) | DBG_FUNC_END,
731 (int)uio->uio_offset, uio->uio_resid, (int)fcb->fcbEOF, (int)fcb->fcbPLen, 0);
732
733 DBG_VOP_LOCKS_TEST(retval);
734 return (retval);
735 }
736
737
738 /*
739
740 #% ioctl vp U U U
741 #
742 vop_ioctl {
743 IN struct vnode *vp;
744 IN u_long command;
745 IN caddr_t data;
746 IN int fflag;
747 IN struct ucred *cred;
748 IN struct proc *p;
749
750 */
751
752
753 /* ARGSUSED */
754 int
755 hfs_ioctl(ap)
756 struct vop_ioctl_args /* {
757 struct vnode *a_vp;
758 int a_command;
759 caddr_t a_data;
760 int a_fflag;
761 struct ucred *a_cred;
762 struct proc *a_p;
763 } */ *ap;
764 {
765 DBG_FUNC_NAME("hfs_ioctl");
766 DBG_VOP_LOCKS_DECL(1);
767 DBG_VOP_PRINT_FUNCNAME();
768 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
769
770 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_UNLOCKED, VOPDBG_UNLOCKED, VOPDBG_UNLOCKED, VOPDBG_POS);
771
772 switch (ap->a_command) {
773
774 case 1:
775 { register struct hfsnode *hp;
776 register struct vnode *vp;
777 register struct radvisory *ra;
778 FCB *fcb;
779 int devBlockSize = 0;
780 int error;
781
782 vp = ap->a_vp;
783
784 VOP_LEASE(vp, ap->a_p, ap->a_cred, LEASE_READ);
785 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_p);
786
787 ra = (struct radvisory *)(ap->a_data);
788 hp = VTOH(vp);
789
790 fcb = HTOFCB(hp);
791
792 if (ra->ra_offset >= fcb->fcbEOF) {
793 VOP_UNLOCK(vp, 0, ap->a_p);
794 DBG_VOP_LOCKS_TEST(EFBIG);
795 return (EFBIG);
796 }
797 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
798
799 error = advisory_read(vp, fcb->fcbEOF, ra->ra_offset, ra->ra_count, devBlockSize);
800 VOP_UNLOCK(vp, 0, ap->a_p);
801
802 DBG_VOP_LOCKS_TEST(error);
803 return (error);
804 }
805
806 case 2: /* F_READBOOTBLOCKS */
807 case 3: /* F_WRITEBOOTBLOCKS */
808 {
809 struct vnode *vp = ap->a_vp;
810 struct hfsnode *hp = VTOH(vp);
811 struct fbootstraptransfer *btd = (struct fbootstraptransfer *)ap->a_data;
812 int devBlockSize;
813 int error;
814 struct iovec aiov;
815 struct uio auio;
816 u_long blockNumber;
817 u_long blockOffset;
818 u_long xfersize;
819 struct buf *bp;
820
821 if ((vp->v_flag & VROOT) == 0) return EINVAL;
822 if (btd->fbt_offset + btd->fbt_length > 1024) return EINVAL;
823
824 aiov.iov_base = btd->fbt_buffer;
825 aiov.iov_len = btd->fbt_length;
826
827 auio.uio_iov = &aiov;
828 auio.uio_iovcnt = 1;
829 auio.uio_offset = btd->fbt_offset;
830 auio.uio_resid = btd->fbt_length;
831 auio.uio_segflg = UIO_USERSPACE;
832 auio.uio_rw = (ap->a_command == 3) ? UIO_WRITE : UIO_READ; /* F_WRITEBOOTSTRAP / F_READBOOTSTRAP */
833 auio.uio_procp = ap->a_p;
834
835 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
836
837 while (auio.uio_resid > 0) {
838 blockNumber = auio.uio_offset / devBlockSize;
839 error = bread(hp->h_meta->h_devvp, blockNumber, devBlockSize, ap->a_cred, &bp);
840 if (error) {
841 if (bp) brelse(bp);
842 return error;
843 };
844
845 blockOffset = auio.uio_offset % devBlockSize;
846 xfersize = devBlockSize - blockOffset;
847 error = uiomove((caddr_t)bp->b_data + blockOffset, (int)xfersize, &auio);
848 if (error) {
849 brelse(bp);
850 return error;
851 };
852 if (auio.uio_rw == UIO_WRITE) {
853 error = VOP_BWRITE(bp);
854 if (error) return error;
855 } else {
856 brelse(bp);
857 };
858 };
859 };
860 return 0;
861
862 case _IOC(IOC_OUT,'h', 4, 0): /* Create date in local time */
863 {
864 *(time_t *)(ap->a_data) = to_bsd_time(VTOVCB(ap->a_vp)->localCreateDate);
865 return 0;
866 }
867
868 default:
869 DBG_VOP_LOCKS_TEST(ENOTTY);
870 return (ENOTTY);
871 }
872
873 /* Should never get here */
874 return 0;
875 }
876
877 /* ARGSUSED */
878 int
879 hfs_select(ap)
880 struct vop_select_args /* {
881 struct vnode *a_vp;
882 int a_which;
883 int a_fflags;
884 struct ucred *a_cred;
885 void *a_wql;
886 struct proc *a_p;
887 } */ *ap;
888 {
889 DBG_FUNC_NAME("hfs_select");
890 DBG_VOP_LOCKS_DECL(1);
891 DBG_VOP_PRINT_FUNCNAME();
892 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
893
894 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_POS);
895
896 /*
897 * We should really check to see if I/O is possible.
898 */
899 DBG_VOP_LOCKS_TEST(1);
900 return (1);
901 }
902
903
904
905 /*
906 * Mmap a file
907 *
908 * NB Currently unsupported.
909 # XXX - not used
910 #
911 vop_mmap {
912 IN struct vnode *vp;
913 IN int fflags;
914 IN struct ucred *cred;
915 IN struct proc *p;
916
917 */
918
919 /* ARGSUSED */
920
921 int
922 hfs_mmap(ap)
923 struct vop_mmap_args /* {
924 struct vnode *a_vp;
925 int a_fflags;
926 struct ucred *a_cred;
927 struct proc *a_p;
928 } */ *ap;
929 {
930 DBG_FUNC_NAME("hfs_mmap");
931 DBG_VOP_LOCKS_DECL(1);
932 DBG_VOP_PRINT_FUNCNAME();
933 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
934
935 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_POS);
936
937 DBG_VOP_LOCKS_TEST(EINVAL);
938 return (EINVAL);
939 }
940
941
942
943 /*
944 * Seek on a file
945 *
946 * Nothing to do, so just return.
947 # XXX - not used
948 # Needs work: Is newoff right? What's it mean?
949 #
950 vop_seek {
951 IN struct vnode *vp;
952 IN off_t oldoff;
953 IN off_t newoff;
954 IN struct ucred *cred;
955 */
956 /* ARGSUSED */
957 int
958 hfs_seek(ap)
959 struct vop_seek_args /* {
960 struct vnode *a_vp;
961 off_t a_oldoff;
962 off_t a_newoff;
963 struct ucred *a_cred;
964 } */ *ap;
965 {
966 DBG_FUNC_NAME("hfs_seek");
967 DBG_VOP_LOCKS_DECL(1);
968 DBG_VOP_PRINT_FUNCNAME();
969 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
970
971 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_POS);
972
973 DBG_VOP_LOCKS_TEST(E_NONE);
974 return (E_NONE);
975 }
976
977
978 /*
979 * Bmap converts a the logical block number of a file to its physical block
980 * number on the disk.
981 */
982
983 /*
984 * vp - address of vnode file the file
985 * bn - which logical block to convert to a physical block number.
986 * vpp - returns the vnode for the block special file holding the filesystem
987 * containing the file of interest
988 * bnp - address of where to return the filesystem physical block number
989 #% bmap vp L L L
990 #% bmap vpp - U -
991 #
992 vop_bmap {
993 IN struct vnode *vp;
994 IN daddr_t bn;
995 OUT struct vnode **vpp;
996 IN daddr_t *bnp;
997 OUT int *runp;
998 */
999 /*
1000 * Converts a logical block number to a physical block, and optionally returns
1001 * the amount of remaining blocks in a run. The logical block is based on hfsNode.logBlockSize.
1002 * The physical block number is based on the device block size, currently its 512.
1003 * The block run is returned in logical blocks, and is the REMAINING amount of blocks
1004 */
1005
1006 int
1007 hfs_bmap(ap)
1008 struct vop_bmap_args /* {
1009 struct vnode *a_vp;
1010 daddr_t a_bn;
1011 struct vnode **a_vpp;
1012 daddr_t *a_bnp;
1013 int *a_runp;
1014 } */ *ap;
1015 {
1016 struct hfsnode *hp = VTOH(ap->a_vp);
1017 struct hfsmount *hfsmp = VTOHFS(ap->a_vp);
1018 int retval = E_NONE;
1019 daddr_t logBlockSize;
1020 size_t bytesContAvail = 0;
1021 off_t blockposition;
1022 struct proc *p = NULL;
1023 int lockExtBtree;
1024 struct rl_entry *invalid_range;
1025 enum rl_overlaptype overlaptype;
1026
1027 #define DEBUG_BMAP 0
1028 #if DEBUG_BMAP
1029 DBG_FUNC_NAME("hfs_bmap");
1030 DBG_VOP_LOCKS_DECL(2);
1031 DBG_VOP_PRINT_FUNCNAME();
1032 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);
1033
1034 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1035 if (ap->a_vpp != NULL) {
1036 DBG_VOP_LOCKS_INIT(1,*ap->a_vpp, VOPDBG_IGNORE, VOPDBG_UNLOCKED, VOPDBG_IGNORE, VOPDBG_POS);
1037 } else {
1038 DBG_VOP_LOCKS_INIT(1,NULL, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_IGNORE, VOPDBG_POS);
1039 };
1040 #endif
1041
1042 DBG_IO(("\tMapped blk %d --> ", ap->a_bn));
1043 /*
1044 * Check for underlying vnode requests and ensure that logical
1045 * to physical mapping is requested.
1046 */
1047 if (ap->a_vpp != NULL)
1048 *ap->a_vpp = VTOH(ap->a_vp)->h_meta->h_devvp;
1049 if (ap->a_bnp == NULL)
1050 return (0);
1051
1052 logBlockSize = GetLogicalBlockSize(ap->a_vp);
1053 blockposition = (off_t)(ap->a_bn * logBlockSize);
1054
1055 lockExtBtree = hasOverflowExtents(hp);
1056 if (lockExtBtree)
1057 {
1058 p = current_proc();
1059 retval = hfs_metafilelocking(hfsmp, kHFSExtentsFileID, LK_EXCLUSIVE | LK_CANRECURSE, p);
1060 if (retval)
1061 return (retval);
1062 }
1063
1064 retval = MacToVFSError(
1065 MapFileBlockC (HFSTOVCB(hfsmp),
1066 HTOFCB(hp),
1067 MAXPHYSIO,
1068 blockposition,
1069 ap->a_bnp,
1070 &bytesContAvail));
1071
1072 if (lockExtBtree) (void) hfs_metafilelocking(hfsmp, kHFSExtentsFileID, LK_RELEASE, p);
1073
1074 if (retval == E_NONE) {
1075 /* Adjust the mapping information for invalid file ranges: */
1076 overlaptype = rl_scan(&hp->h_invalidranges,
1077 blockposition,
1078 blockposition + MAXPHYSIO - 1,
1079 &invalid_range);
1080 if (overlaptype != RL_NOOVERLAP) {
1081 switch(overlaptype) {
1082 case RL_MATCHINGOVERLAP:
1083 case RL_OVERLAPCONTAINSRANGE:
1084 case RL_OVERLAPSTARTSBEFORE:
1085 /* There's no valid block for this byte offset: */
1086 *ap->a_bnp = (daddr_t)-1;
1087 bytesContAvail = invalid_range->rl_end + 1 - blockposition;
1088 break;
1089
1090 case RL_OVERLAPISCONTAINED:
1091 case RL_OVERLAPENDSAFTER:
1092 /* The range of interest hits an invalid block before the end: */
1093 if (invalid_range->rl_start == blockposition) {
1094 /* There's actually no valid information to be had starting here: */
1095 *ap->a_bnp = (daddr_t)-1;
1096 if ((HTOFCB(hp)->fcbEOF > (invalid_range->rl_end + 1)) &&
1097 (invalid_range->rl_end + 1 - blockposition < bytesContAvail)) {
1098 bytesContAvail = invalid_range->rl_end + 1 - blockposition;
1099 };
1100 } else {
1101 bytesContAvail = invalid_range->rl_start - blockposition;
1102 };
1103 break;
1104 };
1105 if (bytesContAvail > MAXPHYSIO) bytesContAvail = MAXPHYSIO;
1106 };
1107
1108 /* Figure out how many read ahead blocks there are */
1109 if (ap->a_runp != NULL) {
1110 if (can_cluster(logBlockSize)) {
1111 /* Make sure this result never goes negative: */
1112 *ap->a_runp = (bytesContAvail < logBlockSize) ? 0 : (bytesContAvail / logBlockSize) - 1;
1113 } else {
1114 *ap->a_runp = 0;
1115 };
1116 };
1117 };
1118
1119 DBG_IO(("%d:%d.\n", *ap->a_bnp, (bytesContAvail < logBlockSize) ? 0 : (bytesContAvail / logBlockSize) - 1));
1120
1121 #if DEBUG_BMAP
1122
1123 DBG_VOP_LOCKS_TEST(retval);
1124 #endif
1125
1126 if (ap->a_runp) {
1127 DBG_ASSERT((*ap->a_runp * logBlockSize) < bytesContAvail); /* At least *ap->a_runp blocks left and ... */
1128 if (can_cluster(logBlockSize)) {
1129 DBG_ASSERT(bytesContAvail - (*ap->a_runp * logBlockSize) < (2*logBlockSize)); /* ... at most 1 logical block accounted for by current block */
1130 /* ... plus some sub-logical block sized piece */
1131 };
1132 };
1133
1134 return (retval);
1135 }
1136
1137 /* blktooff converts logical block number to file offset */
1138
1139 int
1140 hfs_blktooff(ap)
1141 struct vop_blktooff_args /* {
1142 struct vnode *a_vp;
1143 daddr_t a_lblkno;
1144 off_t *a_offset;
1145 } */ *ap;
1146 {
1147 if (ap->a_vp == NULL)
1148 return (EINVAL);
1149 *ap->a_offset = (off_t)ap->a_lblkno * PAGE_SIZE_64;
1150
1151 return(0);
1152 }
1153
1154 int
1155 hfs_offtoblk(ap)
1156 struct vop_offtoblk_args /* {
1157 struct vnode *a_vp;
1158 off_t a_offset;
1159 daddr_t *a_lblkno;
1160 } */ *ap;
1161 {
1162 long lbsize, boff;
1163
1164 if (ap->a_vp == NULL)
1165 return (EINVAL);
1166 *ap->a_lblkno = ap->a_offset / PAGE_SIZE_64;
1167
1168 return(0);
1169 }
1170
1171 int
1172 hfs_cmap(ap)
1173 struct vop_cmap_args /* {
1174 struct vnode *a_vp;
1175 off_t a_foffset;
1176 size_t a_size;
1177 daddr_t *a_bpn;
1178 size_t *a_run;
1179 void *a_poff;
1180 } */ *ap;
1181 {
1182 struct hfsnode *hp = VTOH(ap->a_vp);
1183 struct hfsmount *hfsmp = VTOHFS(ap->a_vp);
1184 FCB *fcb = HTOFCB(hp);
1185 size_t bytesContAvail = 0;
1186 int retval = E_NONE;
1187 int lockExtBtree;
1188 struct proc *p = NULL;
1189 struct rl_entry *invalid_range;
1190 enum rl_overlaptype overlaptype;
1191 off_t limit;
1192
1193 #define DEBUG_CMAP 0
1194 #if DEBUG_CMAP
1195 DBG_FUNC_NAME("hfs_cmap");
1196 DBG_VOP_LOCKS_DECL(2);
1197 DBG_VOP_PRINT_FUNCNAME();
1198 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);
1199
1200 DBG_VOP_LOCKS_INIT(0, ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1201 #endif
1202
1203 DBG_IO(("\tMapped offset %qx --> ", ap->a_foffset));
1204 /*
1205 * Check for underlying vnode requests and ensure that logical
1206 * to physical mapping is requested.
1207 */
1208 if (ap->a_bpn == NULL) {
1209 return (0);
1210 };
1211
1212 if (lockExtBtree = hasOverflowExtents(hp))
1213 {
1214 p = current_proc();
1215 if (retval = hfs_metafilelocking(hfsmp, kHFSExtentsFileID, LK_EXCLUSIVE | LK_CANRECURSE, p)) {
1216 return (retval);
1217 };
1218 }
1219 retval = MacToVFSError(
1220 MapFileBlockC (HFSTOVCB(hfsmp),
1221 fcb,
1222 ap->a_size,
1223 ap->a_foffset,
1224 ap->a_bpn,
1225 &bytesContAvail));
1226
1227 if (lockExtBtree) (void) hfs_metafilelocking(hfsmp, kHFSExtentsFileID, LK_RELEASE, p);
1228
1229 if (retval == E_NONE) {
1230 /* Adjust the mapping information for invalid file ranges: */
1231 overlaptype = rl_scan(&hp->h_invalidranges,
1232 ap->a_foffset,
1233 ap->a_foffset + (off_t)bytesContAvail - 1,
1234 &invalid_range);
1235 if (overlaptype != RL_NOOVERLAP) {
1236 switch(overlaptype) {
1237 case RL_MATCHINGOVERLAP:
1238 case RL_OVERLAPCONTAINSRANGE:
1239 case RL_OVERLAPSTARTSBEFORE:
1240 /* There's no valid block for this byte offset: */
1241 *ap->a_bpn = (daddr_t)-1;
1242
1243 /* There's no point limiting the amount to be returned if the
1244 invalid range that was hit extends all the way to the EOF
1245 (i.e. there's no valid bytes between the end of this range
1246 and the file's EOF):
1247 */
1248 if ((fcb->fcbEOF > (invalid_range->rl_end + 1)) &&
1249 (invalid_range->rl_end + 1 - ap->a_foffset < bytesContAvail)) {
1250 bytesContAvail = invalid_range->rl_end + 1 - ap->a_foffset;
1251 };
1252 break;
1253
1254 case RL_OVERLAPISCONTAINED:
1255 case RL_OVERLAPENDSAFTER:
1256 /* The range of interest hits an invalid block before the end: */
1257 if (invalid_range->rl_start == ap->a_foffset) {
1258 /* There's actually no valid information to be had starting here: */
1259 *ap->a_bpn = (daddr_t)-1;
1260 if ((fcb->fcbEOF > (invalid_range->rl_end + 1)) &&
1261 (invalid_range->rl_end + 1 - ap->a_foffset < bytesContAvail)) {
1262 bytesContAvail = invalid_range->rl_end + 1 - ap->a_foffset;
1263 };
1264 } else {
1265 bytesContAvail = invalid_range->rl_start - ap->a_foffset;
1266 };
1267 break;
1268 };
1269 if (bytesContAvail > ap->a_size) bytesContAvail = ap->a_size;
1270 };
1271
1272 if (ap->a_run) *ap->a_run = bytesContAvail;
1273 };
1274
1275 if (ap->a_poff) *(int *)ap->a_poff = 0;
1276
1277 DBG_IO(("%d:%d.\n", *ap->a_bpn, bytesContAvail));
1278
1279 #if DEBUG_BMAP
1280
1281 DBG_VOP_LOCKS_TEST(retval);
1282 #endif
1283
1284 return (retval);
1285
1286 }
1287
1288 /*
1289 * Calculate the logical to physical mapping if not done already,
1290 * then call the device strategy routine.
1291 #
1292 #vop_strategy {
1293 # IN struct buf *bp;
1294 */
1295 int
1296 hfs_strategy(ap)
1297 struct vop_strategy_args /* {
1298 struct buf *a_bp;
1299 } */ *ap;
1300 {
1301 register struct buf *bp = ap->a_bp;
1302 register struct vnode *vp = bp->b_vp;
1303 register struct hfsnode *hp;
1304 int retval = 0;
1305
1306 DBG_FUNC_NAME("hfs_strategy");
1307
1308 // DBG_VOP_PRINT_FUNCNAME();DBG_VOP_CONT(("\n"));
1309
1310 hp = VTOH(vp);
1311
1312 if ( !(bp->b_flags & B_VECTORLIST)) {
1313
1314 if (vp->v_type == VBLK || vp->v_type == VCHR)
1315 panic("hfs_strategy: device vnode passed!");
1316
1317 if (bp->b_flags & B_PAGELIST) {
1318 /*
1319 * if we have a page list associated with this bp,
1320 * then go through cluster_bp since it knows how to
1321 * deal with a page request that might span non-contiguous
1322 * physical blocks on the disk...
1323 */
1324 retval = cluster_bp(bp);
1325 vp = hp->h_meta->h_devvp;
1326 bp->b_dev = vp->v_rdev;
1327
1328 return (retval);
1329 }
1330 /*
1331 * If we don't already know the filesystem relative block number
1332 * then get it using VOP_BMAP(). If VOP_BMAP() returns the block
1333 * number as -1 then we've got a hole in the file. Although HFS
1334 * filesystems don't create files with holes, invalidating of
1335 * subranges of the file (lazy zero filling) may create such a
1336 * situation.
1337 */
1338 if (bp->b_blkno == bp->b_lblkno) {
1339 if ((retval = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL))) {
1340 bp->b_error = retval;
1341 bp->b_flags |= B_ERROR;
1342 biodone(bp);
1343 return (retval);
1344 }
1345 if ((long)bp->b_blkno == -1)
1346 clrbuf(bp);
1347 }
1348 if ((long)bp->b_blkno == -1) {
1349 biodone(bp);
1350 return (0);
1351 }
1352 if (bp->b_validend == 0) {
1353 /* Record the exact size of the I/O transfer about to be made: */
1354 DBG_ASSERT(bp->b_validoff == 0);
1355 bp->b_validend = bp->b_bcount;
1356 DBG_ASSERT(bp->b_dirtyoff == 0);
1357 };
1358 }
1359 vp = hp->h_meta->h_devvp;
1360 bp->b_dev = vp->v_rdev;
1361 DBG_IO(("\t\t>>>%s: continuing w/ vp: 0x%x with logBlk Ox%X and phyBlk Ox%X\n", funcname, (u_int)vp, bp->b_lblkno, bp->b_blkno));
1362
1363 return VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
1364 }
1365
1366
1367 /*
1368 #% reallocblks vp L L L
1369 #
1370 vop_reallocblks {
1371 IN struct vnode *vp;
1372 IN struct cluster_save *buflist;
1373
1374 */
1375
1376 int
1377 hfs_reallocblks(ap)
1378 struct vop_reallocblks_args /* {
1379 struct vnode *a_vp;
1380 struct cluster_save *a_buflist;
1381 } */ *ap;
1382 {
1383 DBG_FUNC_NAME("hfs_reallocblks");
1384 DBG_VOP_LOCKS_DECL(1);
1385 DBG_VOP_PRINT_FUNCNAME();
1386 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
1387
1388 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1389
1390 /* Currently no support for clustering */ /* XXX */
1391 DBG_VOP_LOCKS_TEST(ENOSPC);
1392 return (ENOSPC);
1393 }
1394
1395
1396
1397 /*
1398 #
1399 #% truncate vp L L L
1400 #
1401 vop_truncate {
1402 IN struct vnode *vp;
1403 IN off_t length;
1404 IN int flags; (IO_SYNC)
1405 IN struct ucred *cred;
1406 IN struct proc *p;
1407 };
1408 * Truncate the hfsnode hp to at most length size, freeing (or adding) the
1409 * disk blocks.
1410 */
1411 int hfs_truncate(ap)
1412 struct vop_truncate_args /* {
1413 struct vnode *a_vp;
1414 off_t a_length;
1415 int a_flags;
1416 struct ucred *a_cred;
1417 struct proc *a_p;
1418 } */ *ap;
1419 {
1420 register struct vnode *vp = ap->a_vp;
1421 register struct hfsnode *hp = VTOH(vp);
1422 off_t length = ap->a_length;
1423 long vflags;
1424 struct timeval tv;
1425 int retval;
1426 FCB *fcb;
1427 off_t bytesToAdd;
1428 off_t actualBytesAdded;
1429 DBG_FUNC_NAME("hfs_truncate");
1430 DBG_VOP_LOCKS_DECL(1);
1431 DBG_VOP_PRINT_FUNCNAME();
1432 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
1433 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1434
1435 #if HFS_DIAGNOSTIC
1436 debug_check_blocksizes(ap->a_vp);
1437 #endif
1438
1439 fcb = HTOFCB(hp);
1440
1441 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 7)) | DBG_FUNC_START,
1442 (int)length, fcb->fcbEOF, fcb->fcbPLen, 0, 0);
1443
1444 if (length < 0) {
1445 DBG_VOP_LOCKS_TEST(EINVAL);
1446 return (EINVAL);
1447 }
1448
1449 if ((!ISHFSPLUS(VTOVCB(vp))) && (length > (off_t)MAXHFSFILESIZE)) {
1450 DBG_VOP_LOCKS_TEST(EFBIG);
1451 return (EFBIG);
1452 }
1453
1454 if (vp->v_type != VREG && vp->v_type != VLNK) {
1455 DBG_VOP_LOCKS_TEST(EISDIR);
1456 return (EISDIR); /* hfs doesn't support truncating of directories */
1457 }
1458
1459 tv = time;
1460 retval = E_NONE;
1461
1462 DBG_RW(("%s: truncate from Ox%lX to Ox%X bytes\n", funcname, fcb->fcbPLen, length));
1463
1464 /*
1465 * we cannot just check if fcb->fcbEOF == length (as an optimization)
1466 * since there may be extra physical blocks that also need truncation
1467 */
1468
1469 /*
1470 * Lengthen the size of the file. We must ensure that the
1471 * last byte of the file is allocated. Since the smallest
1472 * value of fcbEOF is 0, length will be at least 1.
1473 */
1474 if (length > fcb->fcbEOF) {
1475 off_t filePosition;
1476 daddr_t logBlockNo;
1477 long logBlockSize;
1478 long blkOffset;
1479 off_t bytestoclear;
1480 int blockZeroCount;
1481 struct buf *bp=NULL;
1482
1483 /*
1484 * If we don't have enough physical space then
1485 * we need to extend the physical size.
1486 */
1487 if (length > fcb->fcbPLen) {
1488 /* lock extents b-tree (also protects volume bitmap) */
1489 retval = hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_EXCLUSIVE, ap->a_p);
1490 if (retval)
1491 goto Err_Exit;
1492
1493 while ((length > fcb->fcbPLen) && (retval == E_NONE)) {
1494 bytesToAdd = length - fcb->fcbPLen;
1495 retval = MacToVFSError(
1496 ExtendFileC (HTOVCB(hp),
1497 fcb,
1498 bytesToAdd,
1499 0,
1500 kEFAllMask, /* allocate all requested bytes or none */
1501 &actualBytesAdded));
1502
1503 if (actualBytesAdded == 0 && retval == E_NONE) {
1504 if (length > fcb->fcbPLen)
1505 length = fcb->fcbPLen;
1506 break;
1507 }
1508 }
1509 (void) hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_RELEASE, ap->a_p);
1510 if (retval)
1511 goto Err_Exit;
1512
1513 DBG_ASSERT(length <= fcb->fcbPLen);
1514 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 7)) | DBG_FUNC_NONE,
1515 (int)length, fcb->fcbEOF, fcb->fcbPLen, 0, 0);
1516 }
1517
1518 if (! (ap->a_flags & IO_NOZEROFILL)) {
1519
1520 if (UBCISVALID(vp) && retval == E_NONE) {
1521 struct rl_entry *invalid_range;
1522 int devBlockSize;
1523 off_t zero_limit;
1524
1525 zero_limit = (fcb->fcbEOF + (PAGE_SIZE_64 - 1)) & ~PAGE_MASK_64;
1526 if (length < zero_limit) zero_limit = length;
1527
1528 if (length > fcb->fcbEOF) {
1529 /* Extending the file: time to fill out the current last page w. zeroes? */
1530 if ((fcb->fcbEOF & PAGE_MASK_64) &&
1531 (rl_scan(&hp->h_invalidranges,
1532 fcb->fcbEOF & ~PAGE_MASK_64,
1533 fcb->fcbEOF - 1,
1534 &invalid_range) == RL_NOOVERLAP)) {
1535
1536 /* There's some valid data at the start of the (current) last page
1537 of the file, so zero out the remainder of that page to ensure the
1538 entire page contains valid data. Since there is no invalid range
1539 possible past the (current) eof, there's no need to remove anything
1540 from the invalid range list before calling cluster_write(): */
1541 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
1542 retval = cluster_write(vp, (struct uio *) 0, fcb->fcbEOF, zero_limit,
1543 fcb->fcbEOF, (off_t)0, devBlockSize, (ap->a_flags & IO_SYNC) | IO_HEADZEROFILL);
1544 if (retval) goto Err_Exit;
1545
1546 /* Merely invalidate the remaining area, if necessary: */
1547 if (length > zero_limit) rl_add(zero_limit, length - 1, &hp->h_invalidranges);
1548 } else {
1549 /* The page containing the (current) eof is invalid: just add the
1550 remainder of the page to the invalid list, along with the area
1551 being newly allocated:
1552 */
1553 rl_add(fcb->fcbEOF, length - 1, &hp->h_invalidranges);
1554 };
1555 }
1556 } else {
1557
1558 #if 0
1559 /*
1560 * zero out any new logical space...
1561 */
1562 bytestoclear = length - fcb->fcbEOF;
1563 filePosition = fcb->fcbEOF;
1564
1565 while (bytestoclear > 0) {
1566 logBlockNo = (daddr_t)(filePosition / PAGE_SIZE_64);
1567 blkOffset = (long)(filePosition & PAGE_MASK_64);
1568
1569 if (((off_t)(fcb->fcbPLen) - ((off_t)logBlockNo * (off_t)PAGE_SIZE)) < PAGE_SIZE_64)
1570 logBlockSize = (off_t)(fcb->fcbPLen) - ((off_t)logBlockNo * PAGE_SIZE_64);
1571 else
1572 logBlockSize = PAGE_SIZE;
1573
1574 if (logBlockSize < blkOffset)
1575 panic("hfs_truncate: bad logBlockSize computed\n");
1576
1577 blockZeroCount = MIN(bytestoclear, logBlockSize - blkOffset);
1578
1579 if (blkOffset == 0 && ((bytestoclear >= logBlockSize) || filePosition >= fcb->fcbEOF)) {
1580 bp = getblk(vp, logBlockNo, logBlockSize, 0, 0, BLK_WRITE);
1581 retval = 0;
1582
1583 } else {
1584 retval = bread(vp, logBlockNo, logBlockSize, ap->a_cred, &bp);
1585 if (retval) {
1586 brelse(bp);
1587 goto Err_Exit;
1588 }
1589 }
1590 bzero((char *)bp->b_data + blkOffset, blockZeroCount);
1591
1592 bp->b_flags |= B_DIRTY | B_AGE;
1593
1594 if (ap->a_flags & IO_SYNC)
1595 VOP_BWRITE(bp);
1596 else if (logBlockNo % 32)
1597 bawrite(bp);
1598 else
1599 VOP_BWRITE(bp); /* wait after we issue 32 requests */
1600
1601 bytestoclear -= blockZeroCount;
1602 filePosition += blockZeroCount;
1603 }
1604 #else
1605 panic("hfs_truncate: invoked on non-UBC object?!");
1606 #endif
1607 };
1608 }
1609 fcb->fcbEOF = length;
1610
1611 if (UBCISVALID(vp))
1612 ubc_setsize(vp, (off_t)fcb->fcbEOF); /* XXX check errors */
1613
1614 } else { /* Shorten the size of the file */
1615
1616 if (fcb->fcbEOF > length) {
1617 /*
1618 * Any buffers that are past the truncation point need to be
1619 * invalidated (to maintain buffer cache consistency). For
1620 * simplicity, we invalidate all the buffers by calling vinvalbuf.
1621 */
1622 if (UBCISVALID(vp))
1623 ubc_setsize(vp, (off_t)length); /* XXX check errors */
1624
1625 vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
1626 retval = vinvalbuf(vp, vflags, ap->a_cred, ap->a_p, 0, 0);
1627
1628 /* Any space previously marked as invalid is now irrelevant: */
1629 rl_remove(length, fcb->fcbEOF - 1, &hp->h_invalidranges);
1630 }
1631
1632 /*
1633 * For a TBE process the deallocation of the file blocks is
1634 * delayed until the file is closed. And hfs_close calls
1635 * truncate with the IO_NDELAY flag set. So when IO_NDELAY
1636 * isn't set, we make sure this isn't a TBE process.
1637 */
1638 if ((ap->a_flags & IO_NDELAY) || (!ISSET(ap->a_p->p_flag, P_TBE))) {
1639
1640 /* lock extents b-tree (also protects volume bitmap) */
1641 retval = hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_EXCLUSIVE, ap->a_p);
1642 if (retval)
1643 goto Err_Exit;
1644 retval = MacToVFSError(
1645 TruncateFileC(
1646 HTOVCB(hp),
1647 fcb,
1648 length,
1649 false));
1650 (void) hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_RELEASE, ap->a_p);
1651 if (retval)
1652 goto Err_Exit;
1653 }
1654 fcb->fcbEOF = length;
1655
1656 if (fcb->fcbFlags & fcbModifiedMask)
1657 hp->h_nodeflags |= IN_MODIFIED;
1658 }
1659 hp->h_nodeflags |= IN_CHANGE | IN_UPDATE;
1660 retval = VOP_UPDATE(vp, &tv, &tv, MNT_WAIT);
1661 if (retval) {
1662 DBG_ERR(("Could not update truncate"));
1663 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 7)) | DBG_FUNC_NONE,
1664 -1, -1, -1, retval, 0);
1665 }
1666 Err_Exit:;
1667
1668 #if HFS_DIAGNOSTIC
1669 debug_check_blocksizes(ap->a_vp);
1670 #endif
1671
1672 KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 7)) | DBG_FUNC_END,
1673 (int)length, fcb->fcbEOF, fcb->fcbPLen, retval, 0);
1674
1675 DBG_VOP_LOCKS_TEST(retval);
1676 return (retval);
1677 }
1678
1679
1680
1681 /*
1682 #
1683 #% allocate vp L L L
1684 #
1685 vop_allocate {
1686 IN struct vnode *vp;
1687 IN off_t length;
1688 IN int flags;
1689 OUT off_t *bytesallocated;
1690 IN off_t offset;
1691 IN struct ucred *cred;
1692 IN struct proc *p;
1693 };
1694 * allocate the hfsnode hp to at most length size
1695 */
1696 int hfs_allocate(ap)
1697 struct vop_allocate_args /* {
1698 struct vnode *a_vp;
1699 off_t a_length;
1700 u_int32_t a_flags;
1701 off_t *a_bytesallocated;
1702 off_t a_offset;
1703 struct ucred *a_cred;
1704 struct proc *a_p;
1705 } */ *ap;
1706 {
1707 register struct vnode *vp = ap->a_vp;
1708 register struct hfsnode *hp = VTOH(vp);
1709 off_t length = ap->a_length;
1710 off_t startingPEOF;
1711 off_t moreBytesRequested;
1712 off_t actualBytesAdded;
1713 long vflags;
1714 struct timeval tv;
1715 int retval, retval2;
1716 FCB *fcb;
1717 UInt32 blockHint;
1718 UInt32 extendFlags =0; /* For call to ExtendFileC */
1719 DBG_FUNC_NAME("hfs_allocate");
1720 DBG_VOP_LOCKS_DECL(1);
1721 DBG_VOP_PRINT_FUNCNAME();
1722 DBG_VOP_PRINT_VNODE_INFO(ap->a_vp);DBG_VOP_CONT(("\n"));
1723 DBG_VOP_LOCKS_INIT(0,ap->a_vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1724
1725 /* Set the number of bytes allocated to 0 so that the caller will know that we
1726 did nothing. ExtendFileC will fill this in for us if we actually allocate space */
1727
1728 *(ap->a_bytesallocated) = 0;
1729 fcb = HTOFCB(hp);
1730
1731 /* Now for some error checking */
1732
1733 if (length < (off_t)0) {
1734 DBG_VOP_LOCKS_TEST(EINVAL);
1735 return (EINVAL);
1736 }
1737
1738 if (vp->v_type != VREG && vp->v_type != VLNK) {
1739 DBG_VOP_LOCKS_TEST(EISDIR);
1740 return (EISDIR); /* hfs doesn't support truncating of directories */
1741 }
1742
1743 if ((ap->a_flags & ALLOCATEFROMVOL) && (length <= fcb->fcbPLen))
1744 return (EINVAL);
1745
1746 /* Fill in the flags word for the call to Extend the file */
1747
1748 if (ap->a_flags & ALLOCATECONTIG) {
1749 extendFlags |= kEFContigMask;
1750 }
1751
1752 if (ap->a_flags & ALLOCATEALL) {
1753 extendFlags |= kEFAllMask;
1754 }
1755
1756 tv = time;
1757 retval = E_NONE;
1758 blockHint = 0;
1759 startingPEOF = fcb->fcbPLen;
1760
1761 if (ap->a_flags & ALLOCATEFROMPEOF) {
1762 length += fcb->fcbPLen;
1763 }
1764
1765 if (ap->a_flags & ALLOCATEFROMVOL)
1766 blockHint = ap->a_offset / HTOVCB(hp)->blockSize;
1767
1768 /* If no changes are necesary, then we're done */
1769 if (fcb->fcbPLen == length)
1770 goto Std_Exit;
1771
1772 /*
1773 * Lengthen the size of the file. We must ensure that the
1774 * last byte of the file is allocated. Since the smallest
1775 * value of fcbPLen is 0, length will be at least 1.
1776 */
1777 if (length > fcb->fcbPLen) {
1778 moreBytesRequested = length - fcb->fcbPLen;
1779
1780 /* lock extents b-tree (also protects volume bitmap) */
1781 retval = hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_EXCLUSIVE, ap->a_p);
1782 if (retval) goto Err_Exit;
1783
1784 retval = MacToVFSError(
1785 ExtendFileC(HTOVCB(hp),
1786 fcb,
1787 moreBytesRequested,
1788 blockHint,
1789 extendFlags,
1790 &actualBytesAdded));
1791
1792 *(ap->a_bytesallocated) = actualBytesAdded;
1793
1794 (void) hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_RELEASE, ap->a_p);
1795
1796 DBG_ASSERT(length <= fcb->fcbPLen);
1797
1798 /*
1799 * if we get an error and no changes were made then exit
1800 * otherwise we must do the VOP_UPDATE to reflect the changes
1801 */
1802 if (retval && (startingPEOF == fcb->fcbPLen)) goto Err_Exit;
1803
1804 /*
1805 * Adjust actualBytesAdded to be allocation block aligned, not
1806 * clump size aligned.
1807 * NOTE: So what we are reporting does not affect reality
1808 * until the file is closed, when we truncate the file to allocation
1809 * block size.
1810 */
1811
1812 if ((actualBytesAdded != 0) && (moreBytesRequested < actualBytesAdded))
1813 *(ap->a_bytesallocated) =
1814 roundup(moreBytesRequested, (off_t)VTOVCB(vp)->blockSize);
1815
1816 } else { /* Shorten the size of the file */
1817
1818 if (fcb->fcbEOF > length) {
1819 /*
1820 * Any buffers that are past the truncation point need to be
1821 * invalidated (to maintain buffer cache consistency). For
1822 * simplicity, we invalidate all the buffers by calling vinvalbuf.
1823 */
1824 vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
1825 (void) vinvalbuf(vp, vflags, ap->a_cred, ap->a_p, 0, 0);
1826 }
1827
1828 /* lock extents b-tree (also protects volume bitmap) */
1829 retval = hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_EXCLUSIVE, ap->a_p);
1830 if (retval) goto Err_Exit;
1831
1832 retval = MacToVFSError(
1833 TruncateFileC(
1834 HTOVCB(hp),
1835 fcb,
1836 length,
1837 false));
1838 (void) hfs_metafilelocking(HTOHFS(hp), kHFSExtentsFileID, LK_RELEASE, ap->a_p);
1839
1840 /*
1841 * if we get an error and no changes were made then exit
1842 * otherwise we must do the VOP_UPDATE to reflect the changes
1843 */
1844 if (retval && (startingPEOF == fcb->fcbPLen)) goto Err_Exit;
1845 if (fcb->fcbFlags & fcbModifiedMask)
1846 hp->h_nodeflags |= IN_MODIFIED;
1847
1848 DBG_ASSERT(length <= fcb->fcbPLen) // DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG DEBUG
1849
1850 if (fcb->fcbEOF > fcb->fcbPLen) {
1851 fcb->fcbEOF = fcb->fcbPLen;
1852
1853 if (UBCISVALID(vp))
1854 ubc_setsize(vp, (off_t)fcb->fcbEOF); /* XXX check errors */
1855 }
1856 }
1857
1858 Std_Exit:
1859 hp->h_nodeflags |= IN_CHANGE | IN_UPDATE;
1860 retval2 = VOP_UPDATE(vp, &tv, &tv, MNT_WAIT);
1861
1862 if (retval == 0) retval = retval2;
1863
1864 Err_Exit:
1865 DBG_VOP_LOCKS_TEST(retval);
1866 return (retval);
1867 }
1868
1869
1870
1871
1872 /* pagein for HFS filesystem, similar to hfs_read(), but without cluster_read() */
1873 int
1874 hfs_pagein(ap)
1875 struct vop_pagein_args /* {
1876 struct vnode *a_vp,
1877 upl_t a_pl,
1878 vm_offset_t a_pl_offset,
1879 off_t a_f_offset,
1880 size_t a_size,
1881 struct ucred *a_cred,
1882 int a_flags
1883 } */ *ap;
1884 {
1885 register struct vnode *vp;
1886 struct hfsnode *hp;
1887 FCB *fcb;
1888 int devBlockSize = 0;
1889 int retval;
1890
1891 DBG_FUNC_NAME("hfs_pagein");
1892 DBG_VOP_LOCKS_DECL(1);
1893 DBG_VOP_PRINT_FUNCNAME();
1894 DBG_VOP_PRINT_VNODE_INFO(vp);DBG_VOP_CONT(("\n"));
1895 DBG_VOP_LOCKS_INIT(0,vp, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1896
1897 vp = ap->a_vp;
1898 hp = VTOH(vp);
1899 fcb = HTOFCB(hp);
1900
1901 if (vp->v_type != VREG && vp->v_type != VLNK)
1902 panic("hfs_pagein: vp not UBC type\n");
1903
1904 DBG_VOP(("\tfile size Ox%X\n", (u_int)fcb->fcbEOF));
1905 DBG_VOP(("\tstarting at offset Ox%X of file, length Ox%X\n", (u_int)ap->a_f_offset, (u_int)ap->a_size));
1906
1907 #if HFS_DIAGNOSTIC
1908 debug_check_blocksizes(vp);
1909 #endif
1910
1911 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
1912
1913 retval = cluster_pagein(vp, ap->a_pl, ap->a_pl_offset, ap->a_f_offset,
1914 ap->a_size, (off_t)fcb->fcbEOF, devBlockSize,
1915 ap->a_flags);
1916
1917 #if HFS_DIAGNOSTIC
1918 debug_check_blocksizes(vp);
1919 #endif
1920 DBG_VOP_LOCKS_TEST(retval);
1921
1922 return (retval);
1923 }
1924
1925 /*
1926 * pageout for HFS filesystem.
1927 */
1928 int
1929 hfs_pageout(ap)
1930 struct vop_pageout_args /* {
1931 struct vnode *a_vp,
1932 upl_t a_pl,
1933 vm_offset_t a_pl_offset,
1934 off_t a_f_offset,
1935 size_t a_size,
1936 struct ucred *a_cred,
1937 int a_flags
1938 } */ *ap;
1939 {
1940 struct vnode *vp = ap->a_vp;
1941 struct hfsnode *hp = VTOH(vp);
1942 FCB *fcb = HTOFCB(hp);
1943 int retval;
1944 int devBlockSize = 0;
1945 off_t end_of_range;
1946
1947 DBG_FUNC_NAME("hfs_pageout");
1948 DBG_VOP_LOCKS_DECL(1);
1949 DBG_VOP_PRINT_FUNCNAME();
1950 DBG_VOP_PRINT_VNODE_INFO(vp);DBG_VOP_CONT(("\n"));
1951 DBG_VOP(("\thfsnode 0x%x (%s)\n", (u_int)hp, H_NAME(hp)));
1952 DBG_VOP(("\tstarting at offset Ox%lX of file, length Ox%lX\n",
1953 (UInt32)ap->a_f_offset, (UInt32)ap->a_size));
1954
1955 DBG_VOP_LOCKS_INIT(0, vp, VOPDBG_LOCKED,
1956 VOPDBG_LOCKED, VOPDBG_LOCKED, VOPDBG_POS);
1957
1958 #if HFS_DIAGNOSTIC
1959 debug_check_blocksizes(vp);
1960 #endif
1961
1962 if (UBCINVALID(vp))
1963 panic("hfs_pageout: Not a VREG: vp=%x", vp);
1964
1965 VOP_DEVBLOCKSIZE(hp->h_meta->h_devvp, &devBlockSize);
1966
1967 end_of_range = ap->a_f_offset + ap->a_size - 1;
1968
1969 if (end_of_range >= (off_t)fcb->fcbEOF)
1970 end_of_range = (off_t)(fcb->fcbEOF - 1);
1971
1972 if (ap->a_f_offset < (off_t)fcb->fcbEOF)
1973 rl_remove(ap->a_f_offset, end_of_range, &hp->h_invalidranges);
1974
1975 retval = cluster_pageout(vp, ap->a_pl, ap->a_pl_offset, ap->a_f_offset, ap->a_size,
1976 (off_t)fcb->fcbEOF, devBlockSize, ap->a_flags);
1977
1978 /*
1979 * If we successfully wrote any data, and we are not the superuser
1980 * we clear the setuid and setgid bits as a precaution against
1981 * tampering.
1982 */
1983 if (retval == 0 && ap->a_cred && ap->a_cred->cr_uid != 0)
1984 hp->h_meta->h_mode &= ~(ISUID | ISGID);
1985
1986 #if HFS_DIAGNOSTIC
1987 debug_check_blocksizes(vp);
1988 #endif
1989
1990 DBG_VOP_LOCKS_TEST(retval);
1991 return (retval);
1992 }
1993
1994 /*
1995 * Intercept B-Tree node writes to unswap them if necessary.
1996 #
1997 #vop_bwrite {
1998 # IN struct buf *bp;
1999 */
2000 int
2001 hfs_bwrite(ap)
2002 struct vop_bwrite_args /* {
2003 struct buf *a_bp;
2004 } */ *ap;
2005 {
2006 register struct buf *bp = ap->a_bp;
2007 register struct vnode *vp = bp->b_vp;
2008 BlockDescriptor block;
2009 int retval = 0;
2010
2011 DBG_FUNC_NAME("hfs_bwrite");
2012
2013 #if BYTE_ORDER == LITTLE_ENDIAN
2014 /* Trap B-Tree writes */
2015 if ((H_FILEID(VTOH(vp)) == kHFSExtentsFileID) ||
2016 (H_FILEID(VTOH(vp)) == kHFSCatalogFileID)) {
2017
2018 /* Swap if the B-Tree node is in native byte order */
2019 if (((UInt16 *)((char *)bp->b_data + bp->b_bcount - 2))[0] == 0x000e) {
2020 /* Prepare the block pointer */
2021 block.blockHeader = bp;
2022 block.buffer = bp->b_data + IOBYTEOFFSETFORBLK(bp->b_blkno, VTOHFS(vp)->hfs_phys_block_size);
2023 block.blockReadFromDisk = (bp->b_flags & B_CACHE) == 0; /* not found in cache ==> came from disk */
2024 block.blockSize = bp->b_bcount;
2025
2026 /* Endian un-swap B-Tree node */
2027 SWAP_BT_NODE (&block, ISHFSPLUS (VTOVCB(vp)), H_FILEID(VTOH(vp)), 1);
2028 }
2029
2030 /* We don't check to make sure that it's 0x0e00 because it could be all zeros */
2031 }
2032 #endif
2033
2034 retval = vn_bwrite (ap);
2035
2036 return (retval);
2037 }
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