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91447636 A |
1 | /* |
2 | * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_LICENSE_HEADER_START@ | |
5 | * | |
ff6e181a A |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License | |
8 | * Version 2.0 (the 'License'). You may not use this file except in | |
9 | * compliance with the License. Please obtain a copy of the License at | |
10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
11 | * file. | |
91447636 | 12 | * |
ff6e181a A |
13 | * The Original Code and all software distributed under the License are |
14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
91447636 A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
ff6e181a A |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
18 | * Please see the License for the specific language governing rights and | |
19 | * limitations under the License. | |
91447636 A |
20 | * |
21 | * @APPLE_LICENSE_HEADER_END@ | |
22 | */ | |
23 | ||
24 | #include <sys/param.h> | |
25 | #include <sys/systm.h> | |
26 | #include <sys/kernel.h> | |
27 | #include <sys/malloc.h> | |
28 | #include <sys/utfconv.h> | |
29 | #include <sys/vnode.h> | |
30 | #include <sys/xattr.h> | |
31 | ||
32 | #include "hfs.h" | |
33 | #include "hfs_cnode.h" | |
34 | #include "hfs_mount.h" | |
35 | #include "hfs_format.h" | |
36 | #include "hfs_endian.h" | |
37 | ||
38 | #include "hfscommon/headers/BTreesInternal.h" | |
39 | ||
40 | ||
41 | #define ATTRIBUTE_FILE_NODE_SIZE 8192 | |
42 | ||
43 | ||
44 | /* State information for the listattr_callback callback function. */ | |
45 | struct listattr_callback_state { | |
46 | u_int32_t fileID; | |
47 | int result; | |
48 | uio_t uio; | |
49 | size_t size; | |
50 | }; | |
51 | ||
52 | #define HFS_MAXATTRIBUTESIZE (1024*1024) | |
53 | ||
54 | /* HFS Internal Names */ | |
55 | #define XATTR_EXTENDEDSECURITY_NAME "system.extendedsecurity" | |
56 | ||
57 | ||
58 | #define RESOURCE_FORK_EXISTS(VP) \ | |
59 | ((VTOC((VP))->c_blocks - VTOF((VP))->ff_blocks) > 0) | |
60 | ||
61 | static u_int32_t emptyfinfo[8] = {0}; | |
62 | ||
63 | ||
64 | extern int hfs_create_attr_btree(struct hfsmount *hfsmp, uint32_t nodesize, uint32_t nodecnt); | |
65 | ||
66 | ||
67 | int hfs_vnop_getxattr(struct vnop_getxattr_args *ap); | |
68 | int hfs_vnop_setxattr(struct vnop_setxattr_args *ap); | |
69 | int hfs_vnop_removexattr(struct vnop_removexattr_args *ap); | |
70 | int hfs_vnop_listxattr(struct vnop_listxattr_args *ap); | |
71 | int hfs_attrkeycompare(HFSPlusAttrKey *searchKey, HFSPlusAttrKey *trialKey); | |
72 | ||
73 | ||
74 | ||
75 | static int listattr_callback(const HFSPlusAttrKey *key, const HFSPlusAttrData *data, | |
76 | struct listattr_callback_state *state); | |
77 | ||
78 | static int buildkey(u_int32_t fileID, const char *attrname, HFSPlusAttrKey *key); | |
79 | ||
80 | static int getnodecount(struct hfsmount *hfsmp, size_t nodesize); | |
81 | ||
82 | static size_t getmaxinlineattrsize(struct vnode * attrvp); | |
83 | ||
84 | /* | |
85 | * Retrieve the data of an extended attribute. | |
86 | */ | |
87 | __private_extern__ | |
88 | int | |
89 | hfs_vnop_getxattr(struct vnop_getxattr_args *ap) | |
90 | /* | |
91 | struct vnop_getxattr_args { | |
92 | struct vnodeop_desc *a_desc; | |
93 | vnode_t a_vp; | |
94 | char * a_name; | |
95 | uio_t a_uio; | |
96 | size_t *a_size; | |
97 | int a_options; | |
98 | vfs_context_t a_context; | |
99 | }; | |
100 | */ | |
101 | { | |
102 | struct vnode *vp = ap->a_vp; | |
103 | struct hfsmount *hfsmp; | |
104 | uio_t uio = ap->a_uio; | |
105 | struct BTreeIterator * iterator = NULL; | |
106 | struct filefork *btfile; | |
107 | FSBufferDescriptor btdata; | |
108 | HFSPlusAttrData * datap = NULL; | |
109 | size_t bufsize; | |
110 | UInt16 datasize; | |
111 | int lockflags; | |
112 | int result; | |
113 | ||
114 | if (ap->a_name == NULL || ap->a_name[0] == '\0') { | |
115 | return (EINVAL); /* invalid name */ | |
116 | } | |
117 | hfsmp = VTOHFS(vp); | |
118 | ||
119 | if (!VNODE_IS_RSRC(vp)) { | |
120 | /* Get the Finder Info. */ | |
121 | if (bcmp(ap->a_name, XATTR_FINDERINFO_NAME, sizeof(XATTR_FINDERINFO_NAME)) == 0) { | |
122 | bufsize = 32; | |
123 | ||
124 | /* If Finder Info is empty then it doesn't exist. */ | |
125 | if (bcmp(VTOC(vp)->c_finderinfo, emptyfinfo, sizeof(emptyfinfo)) == 0) { | |
126 | return (ENOATTR); | |
127 | } | |
128 | if (uio == NULL) { | |
129 | *ap->a_size = bufsize; | |
130 | return (0); | |
131 | } | |
132 | if (uio_resid(uio) < bufsize) | |
133 | return (ERANGE); | |
134 | ||
135 | result = uiomove((caddr_t) &VTOC(vp)->c_finderinfo , bufsize, uio); | |
136 | ||
137 | return (result); | |
138 | } | |
139 | /* Read the Resource Fork. */ | |
140 | if (bcmp(ap->a_name, XATTR_RESOURCEFORK_NAME, sizeof(XATTR_RESOURCEFORK_NAME)) == 0) { | |
141 | struct vnode *rvp = NULL; | |
142 | ||
143 | if ( !vnode_isreg(vp) ) { | |
144 | return (EPERM); | |
145 | } | |
146 | if ( !RESOURCE_FORK_EXISTS(vp)) { | |
147 | return (ENOATTR); | |
148 | } | |
149 | if ((result = hfs_vgetrsrc(hfsmp, vp, &rvp, vfs_context_proc(ap->a_context)))) { | |
150 | return (result); | |
151 | } | |
152 | if (uio == NULL) { | |
153 | *ap->a_size = (size_t)VTOF(rvp)->ff_size; | |
154 | } else { | |
155 | result = VNOP_READ(rvp, uio, 0, ap->a_context); | |
156 | } | |
157 | vnode_put(rvp); | |
158 | return (result); | |
159 | } | |
160 | } | |
161 | /* | |
162 | * Standard HFS only supports native FinderInfo and Resource Forks. | |
163 | */ | |
164 | if (hfsmp->hfs_flags & HFS_STANDARD) { | |
165 | return (EPERM); | |
166 | } | |
167 | /* Bail if we don't have any extended attributes. */ | |
168 | if ((hfsmp->hfs_attribute_vp == NULL) || | |
169 | (VTOC(vp)->c_attr.ca_recflags & kHFSHasAttributesMask) == 0) { | |
170 | return (ENOATTR); | |
171 | } | |
172 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
173 | ||
174 | MALLOC(iterator, BTreeIterator *, sizeof(*iterator), M_TEMP, M_WAITOK); | |
175 | bzero(iterator, sizeof(*iterator)); | |
176 | ||
177 | bufsize = sizeof(HFSPlusAttrData) - 2; | |
178 | if (uio) | |
179 | bufsize += uio_resid(uio); | |
180 | MALLOC(datap, HFSPlusAttrData *, bufsize, M_TEMP, M_WAITOK); | |
181 | btdata.bufferAddress = datap; | |
182 | btdata.itemSize = bufsize; | |
183 | btdata.itemCount = 1; | |
184 | ||
185 | result = buildkey(VTOC(vp)->c_fileid, ap->a_name, (HFSPlusAttrKey *)&iterator->key); | |
186 | if (result) | |
187 | goto exit; | |
188 | ||
189 | /* Lookup the attribute. */ | |
190 | lockflags = hfs_systemfile_lock(hfsmp, SFL_ATTRIBUTE, HFS_SHARED_LOCK); | |
191 | result = BTSearchRecord(btfile, iterator, &btdata, &datasize, NULL); | |
192 | hfs_systemfile_unlock(hfsmp, lockflags); | |
193 | ||
194 | if (result) { | |
195 | if (result == btNotFound) | |
196 | result = ENOATTR; | |
197 | goto exit; | |
198 | } | |
199 | ||
200 | *ap->a_size = datap->attrSize; | |
201 | ||
202 | /* Copy out the attribute data. */ | |
203 | if (uio) { | |
204 | if (datap->attrSize > uio_resid(uio)) | |
205 | result = ERANGE; | |
206 | else | |
207 | result = uiomove((caddr_t) &datap->attrData , datap->attrSize, uio); | |
208 | } | |
209 | exit: | |
210 | FREE(datap, M_TEMP); | |
211 | FREE(iterator, M_TEMP); | |
212 | ||
213 | return MacToVFSError(result); | |
214 | } | |
215 | ||
216 | /* | |
217 | * Set the data of an extended attribute. | |
218 | */ | |
219 | __private_extern__ | |
220 | int | |
221 | hfs_vnop_setxattr(struct vnop_setxattr_args *ap) | |
222 | /* | |
223 | struct vnop_setxattr_args { | |
224 | struct vnodeop_desc *a_desc; | |
225 | vnode_t a_vp; | |
226 | char * a_name; | |
227 | uio_t a_uio; | |
228 | int a_options; | |
229 | vfs_context_t a_context; | |
230 | }; | |
231 | */ | |
232 | { | |
233 | struct vnode *vp = ap->a_vp; | |
234 | struct hfsmount *hfsmp; | |
235 | uio_t uio = ap->a_uio; | |
236 | struct BTreeIterator * iterator = NULL; | |
237 | struct filefork *btfile; | |
238 | size_t attrsize; | |
239 | FSBufferDescriptor btdata; | |
240 | HFSPlusAttrData * datap = NULL; | |
241 | UInt16 datasize; | |
242 | int lockflags; | |
243 | int result; | |
244 | ||
245 | if (ap->a_name == NULL || ap->a_name[0] == '\0') { | |
246 | return (EINVAL); /* invalid name */ | |
247 | } | |
248 | hfsmp = VTOHFS(vp); | |
249 | if (VNODE_IS_RSRC(vp)) { | |
250 | return (EPERM); | |
251 | } | |
252 | /* Set the Finder Info. */ | |
253 | if (bcmp(ap->a_name, XATTR_FINDERINFO_NAME, sizeof(XATTR_FINDERINFO_NAME)) == 0) { | |
254 | attrsize = 32; | |
255 | ||
256 | if (bcmp(VTOC(vp)->c_finderinfo, emptyfinfo, sizeof(emptyfinfo))) { | |
257 | /* attr exists and "create" was specified. */ | |
258 | if (ap->a_options & XATTR_CREATE) { | |
259 | return (EEXIST); | |
260 | } | |
261 | } else { | |
262 | /* attr doesn't exists and "replace" was specified. */ | |
263 | if (ap->a_options & XATTR_REPLACE) { | |
264 | return (ENOATTR); | |
265 | } | |
266 | } | |
267 | if (uio_resid(uio) != attrsize) | |
268 | return (ERANGE); | |
269 | ||
270 | result = uiomove((caddr_t) &VTOC(vp)->c_finderinfo , attrsize, uio); | |
271 | if (result == 0) { | |
272 | VTOC(vp)->c_touch_chgtime = TRUE; | |
273 | VTOC(vp)->c_flag |= C_MODIFIED; | |
274 | result = hfs_update(vp, FALSE); | |
275 | } | |
276 | return (result); | |
277 | } | |
278 | /* Write the Resource Fork. */ | |
279 | if (bcmp(ap->a_name, XATTR_RESOURCEFORK_NAME, sizeof(XATTR_RESOURCEFORK_NAME)) == 0) { | |
280 | struct vnode *rvp = NULL; | |
281 | ||
282 | if (!vnode_isreg(vp)) { | |
283 | return (EPERM); | |
284 | } | |
285 | if (RESOURCE_FORK_EXISTS(vp)) { | |
286 | /* attr exists and "create" was specified. */ | |
287 | if (ap->a_options & XATTR_CREATE) { | |
288 | return (EEXIST); | |
289 | } | |
290 | } else { | |
291 | /* attr doesn't exists and "replace" was specified. */ | |
292 | if (ap->a_options & XATTR_REPLACE) { | |
293 | return (ENOATTR); | |
294 | } | |
295 | } | |
296 | if ((result = hfs_vgetrsrc(hfsmp, vp, &rvp, vfs_context_proc(ap->a_context)))) { | |
297 | return (result); | |
298 | } | |
299 | result = VNOP_WRITE(rvp, uio, 0, ap->a_context); | |
300 | vnode_put(rvp); | |
301 | return (result); | |
302 | } | |
303 | /* | |
304 | * Standard HFS only supports native FinderInfo and Resource Forks. | |
305 | */ | |
306 | if (hfsmp->hfs_flags & HFS_STANDARD) { | |
307 | return (EPERM); | |
308 | } | |
309 | if (hfsmp->hfs_max_inline_attrsize == 0) { | |
310 | hfsmp->hfs_max_inline_attrsize = getmaxinlineattrsize(hfsmp->hfs_attribute_vp); | |
311 | } | |
312 | attrsize = uio_resid(uio); | |
313 | if (attrsize > hfsmp->hfs_max_inline_attrsize) { | |
314 | /* | |
315 | * XXX Need to support extent-based attributes XXX | |
316 | */ | |
317 | return (E2BIG); | |
318 | } | |
319 | /* Calculate size of record rounded up to multiple of 2 bytes. */ | |
320 | datasize = sizeof(HFSPlusAttrData) - 2 + attrsize + ((attrsize & 1) ? 1 : 0); | |
321 | ||
322 | MALLOC(iterator, BTreeIterator *, sizeof(*iterator), M_TEMP, M_WAITOK); | |
323 | bzero(iterator, sizeof(*iterator)); | |
324 | ||
325 | MALLOC(datap, HFSPlusAttrData *, datasize, M_TEMP, M_WAITOK); | |
326 | btdata.bufferAddress = datap; | |
327 | btdata.itemSize = datasize; | |
328 | btdata.itemCount = 1; | |
329 | datap->recordType = kHFSPlusAttrInlineData; | |
330 | datap->reserved[0] = 0; | |
331 | datap->reserved[1] = 0; | |
332 | datap->attrSize = attrsize; | |
333 | ||
334 | /* Copy in the attribute data. */ | |
335 | result = uiomove((caddr_t) &datap->attrData , attrsize, uio); | |
336 | if (result) { | |
337 | goto exit2; | |
338 | } | |
339 | /* Build a b-tree key. */ | |
340 | result = buildkey(VTOC(vp)->c_fileid, ap->a_name, (HFSPlusAttrKey *)&iterator->key); | |
341 | if (result) { | |
342 | goto exit2; | |
343 | } | |
344 | /* Start a transaction for our changes. */ | |
345 | if (hfs_start_transaction(hfsmp) != 0) { | |
346 | result = EINVAL; | |
347 | goto exit2; | |
348 | } | |
349 | ||
350 | /* once we started the transaction, nobody can compete with us, so make sure this file is still there */ | |
351 | struct cnode *cp; | |
352 | cp = VTOC(vp); | |
353 | if (cp->c_flag & C_NOEXISTS) { /* this file has already been removed */ | |
354 | result = ENOENT; | |
355 | goto exit1; | |
356 | } | |
357 | ||
358 | /* | |
359 | * If there isn't an attributes b-tree then create one. | |
360 | */ | |
361 | if (hfsmp->hfs_attribute_vp == NULL) { | |
362 | lockflags = hfs_systemfile_lock(hfsmp, SFL_EXTENTS, HFS_EXCLUSIVE_LOCK); | |
363 | result = hfs_create_attr_btree(hfsmp, ATTRIBUTE_FILE_NODE_SIZE, | |
364 | getnodecount(hfsmp, ATTRIBUTE_FILE_NODE_SIZE)); | |
365 | hfs_systemfile_unlock(hfsmp, lockflags); | |
366 | if (result) { | |
367 | goto exit1; | |
368 | } | |
369 | } | |
370 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
371 | ||
372 | lockflags = hfs_systemfile_lock(hfsmp, SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK); | |
373 | ||
374 | if (ap->a_options & XATTR_REPLACE) { | |
375 | result = BTReplaceRecord(btfile, iterator, &btdata, datasize); | |
376 | if (result) | |
377 | goto exit0; | |
378 | else | |
379 | goto exit; | |
380 | } | |
381 | ||
382 | /* Insert the attribute. */ | |
383 | result = BTInsertRecord(btfile, iterator, &btdata, datasize); | |
384 | if (result) { | |
385 | if (result != btExists) { | |
386 | goto exit0; | |
387 | } | |
388 | ||
389 | // if it exists and XATTR_CREATE was specified, | |
390 | // the spec says to return EEXIST | |
391 | if (ap->a_options & XATTR_CREATE) { | |
392 | result = EEXIST; | |
393 | goto exit0; | |
394 | } | |
395 | /* XXX need to account for old size in c_attrblks */ | |
396 | result = BTReplaceRecord(btfile, iterator, &btdata, datasize); | |
397 | } | |
398 | exit: | |
399 | (void) BTFlushPath(btfile); | |
400 | exit0: | |
401 | hfs_systemfile_unlock(hfsmp, lockflags); | |
402 | if (result == 0) { | |
403 | struct cnode * cp; | |
404 | ||
405 | cp = VTOC(vp); | |
406 | cp->c_touch_chgtime = TRUE; | |
407 | if ((cp->c_attr.ca_recflags & kHFSHasAttributesMask) == 0) { | |
408 | cp->c_attr.ca_recflags |= kHFSHasAttributesMask; | |
409 | (void) hfs_update(vp, 0); | |
410 | } | |
411 | HFS_KNOTE(vp, NOTE_ATTRIB); | |
412 | } | |
413 | exit1: | |
414 | /* Finish the transaction of our changes. */ | |
415 | hfs_end_transaction(hfsmp); | |
416 | exit2: | |
417 | FREE(datap, M_TEMP); | |
418 | FREE(iterator, M_TEMP); | |
419 | ||
420 | if (result == btNotFound) | |
421 | result = ENOATTR; | |
422 | else | |
423 | result = MacToVFSError(result); | |
424 | ||
425 | return (result); | |
426 | } | |
427 | ||
428 | /* | |
429 | * Remove an extended attribute. | |
430 | */ | |
431 | __private_extern__ | |
432 | int | |
433 | hfs_vnop_removexattr(struct vnop_removexattr_args *ap) | |
434 | /* | |
435 | struct vnop_removexattr_args { | |
436 | struct vnodeop_desc *a_desc; | |
437 | vnode_t a_vp; | |
438 | char * a_name; | |
439 | int a_options; | |
440 | vfs_context_t a_context; | |
441 | }; | |
442 | */ | |
443 | { | |
444 | struct vnode *vp = ap->a_vp; | |
445 | struct hfsmount *hfsmp; | |
446 | struct BTreeIterator * iterator = NULL; | |
447 | struct filefork *btfile; | |
448 | struct proc *p = vfs_context_proc(ap->a_context); | |
449 | FSBufferDescriptor btdata; | |
450 | HFSPlusAttrData attrdata; | |
451 | int lockflags; | |
452 | int result; | |
453 | ||
454 | if (ap->a_name == NULL || ap->a_name[0] == '\0') { | |
455 | return (EINVAL); /* invalid name */ | |
456 | } | |
457 | hfsmp = VTOHFS(vp); | |
458 | if (VNODE_IS_RSRC(vp)) { | |
459 | return (EPERM); | |
460 | } | |
461 | ||
462 | /* If Resource Fork is non-empty then truncate it. */ | |
463 | if (bcmp(ap->a_name, XATTR_RESOURCEFORK_NAME, sizeof(XATTR_RESOURCEFORK_NAME)) == 0) { | |
464 | struct vnode *rvp = NULL; | |
465 | ||
466 | if ( !vnode_isreg(vp) ) { | |
467 | return (EPERM); | |
468 | } | |
469 | if ( !RESOURCE_FORK_EXISTS(vp) ) { | |
470 | return (ENOATTR); | |
471 | } | |
472 | if ((result = hfs_vgetrsrc(hfsmp, vp, &rvp, p))) { | |
473 | return (result); | |
474 | } | |
475 | hfs_lock_truncate(VTOC(rvp), TRUE); | |
476 | if ((result = hfs_lock(VTOC(rvp), HFS_EXCLUSIVE_LOCK))) { | |
477 | hfs_unlock_truncate(VTOC(vp)); | |
478 | vnode_put(rvp); | |
479 | return (result); | |
480 | } | |
481 | result = hfs_truncate(rvp, (off_t)0, IO_NDELAY, 0, ap->a_context); | |
482 | ||
483 | hfs_unlock_truncate(VTOC(rvp)); | |
484 | hfs_unlock(VTOC(rvp)); | |
485 | ||
486 | vnode_put(rvp); | |
487 | return (result); | |
488 | } | |
489 | /* Clear out the Finder Info. */ | |
490 | if (bcmp(ap->a_name, XATTR_FINDERINFO_NAME, sizeof(XATTR_FINDERINFO_NAME)) == 0) { | |
491 | if (bcmp(VTOC(vp)->c_finderinfo, emptyfinfo, sizeof(emptyfinfo)) == 0) { | |
492 | return (ENOATTR); | |
493 | } | |
494 | bzero(VTOC(vp)->c_finderinfo, sizeof(emptyfinfo)); | |
495 | return (0); | |
496 | } | |
497 | /* | |
498 | * Standard HFS only supports native FinderInfo and Resource Forks. | |
499 | */ | |
500 | if (hfsmp->hfs_flags & HFS_STANDARD) { | |
501 | return (EPERM); | |
502 | } | |
503 | if (hfsmp->hfs_attribute_vp == NULL) { | |
504 | return (ENOATTR); | |
505 | } | |
506 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
507 | ||
508 | MALLOC(iterator, BTreeIterator *, sizeof(*iterator), M_TEMP, M_WAITOK); | |
509 | bzero(iterator, sizeof(*iterator)); | |
510 | ||
511 | if (hfs_start_transaction(hfsmp) != 0) { | |
512 | result = EINVAL; | |
513 | goto exit2; | |
514 | } | |
515 | ||
516 | result = buildkey(VTOC(vp)->c_fileid, ap->a_name, (HFSPlusAttrKey *)&iterator->key); | |
517 | if (result) | |
518 | goto exit2; | |
519 | ||
520 | lockflags = hfs_systemfile_lock(hfsmp, SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK); | |
521 | ||
522 | btdata.bufferAddress = &attrdata; | |
523 | btdata.itemSize = sizeof(attrdata); | |
524 | btdata.itemCount = 1; | |
525 | result = BTSearchRecord(btfile, iterator, &btdata, NULL, NULL); | |
526 | if (result) | |
527 | goto exit1; | |
528 | ||
529 | result = BTDeleteRecord(btfile, iterator); | |
530 | (void) BTFlushPath(btfile); | |
531 | exit1: | |
532 | hfs_systemfile_unlock(hfsmp, lockflags); | |
533 | if (result == 0) { | |
534 | VTOC(vp)->c_touch_chgtime = TRUE; | |
535 | HFS_KNOTE(vp, NOTE_ATTRIB); | |
536 | } | |
537 | exit2: | |
538 | if (result == btNotFound) { | |
539 | result = ENOATTR; | |
540 | } | |
541 | hfs_end_transaction(hfsmp); | |
542 | ||
543 | FREE(iterator, M_TEMP); | |
544 | ||
545 | return MacToVFSError(result); | |
546 | } | |
547 | ||
548 | ||
549 | /* | |
550 | * Retrieve the list of extended attribute names. | |
551 | */ | |
552 | __private_extern__ | |
553 | int | |
554 | hfs_vnop_listxattr(struct vnop_listxattr_args *ap) | |
555 | /* | |
556 | struct vnop_listxattr_args { | |
557 | struct vnodeop_desc *a_desc; | |
558 | vnode_t a_vp; | |
559 | uio_t a_uio; | |
560 | size_t *a_size; | |
561 | int a_options; | |
562 | vfs_context_t a_context; | |
563 | */ | |
564 | { | |
565 | struct vnode *vp = ap->a_vp; | |
566 | struct hfsmount *hfsmp; | |
567 | uio_t uio = ap->a_uio; | |
568 | struct BTreeIterator * iterator = NULL; | |
569 | struct filefork *btfile; | |
570 | struct listattr_callback_state state; | |
571 | int lockflags; | |
572 | int result; | |
573 | ||
574 | if (VNODE_IS_RSRC(vp)) { | |
575 | return (EPERM); | |
576 | } | |
577 | hfsmp = VTOHFS(vp); | |
578 | *ap->a_size = 0; | |
579 | ||
580 | /* If Finder Info is non-empty then export it. */ | |
581 | if (bcmp(VTOC(vp)->c_finderinfo, emptyfinfo, sizeof(emptyfinfo)) != 0) { | |
582 | if (uio == NULL) { | |
583 | *ap->a_size += sizeof(XATTR_FINDERINFO_NAME); | |
584 | } else if (uio_resid(uio) < sizeof(XATTR_FINDERINFO_NAME)) { | |
585 | return (ERANGE); | |
586 | } else { | |
587 | result = uiomove((caddr_t)XATTR_FINDERINFO_NAME, | |
588 | sizeof(XATTR_FINDERINFO_NAME), uio); | |
589 | if (result) | |
590 | return (result); | |
591 | } | |
592 | } | |
593 | /* If Resource Fork is non-empty then export it. */ | |
594 | if (vnode_isreg(vp) && RESOURCE_FORK_EXISTS(vp)) { | |
595 | if (uio == NULL) { | |
596 | *ap->a_size += sizeof(XATTR_RESOURCEFORK_NAME); | |
597 | } else if (uio_resid(uio) < sizeof(XATTR_RESOURCEFORK_NAME)) { | |
598 | return (ERANGE); | |
599 | } else { | |
600 | result = uiomove((caddr_t)XATTR_RESOURCEFORK_NAME, | |
601 | sizeof(XATTR_RESOURCEFORK_NAME), uio); | |
602 | if (result) | |
603 | return (result); | |
604 | } | |
605 | } | |
606 | /* | |
607 | * Standard HFS only supports native FinderInfo and Resource Forks. | |
608 | * Return at this point. | |
609 | */ | |
610 | if (hfsmp->hfs_flags & HFS_STANDARD) { | |
611 | return (0); | |
612 | } | |
613 | /* Bail if we don't have any extended attributes. */ | |
614 | if ((hfsmp->hfs_attribute_vp == NULL) || | |
615 | (VTOC(vp)->c_attr.ca_recflags & kHFSHasAttributesMask) == 0) { | |
616 | return (0); | |
617 | } | |
618 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
619 | ||
620 | MALLOC(iterator, BTreeIterator *, sizeof(*iterator), M_TEMP, M_WAITOK); | |
621 | bzero(iterator, sizeof(*iterator)); | |
622 | result = buildkey(VTOC(vp)->c_fileid, NULL, (HFSPlusAttrKey *)&iterator->key); | |
623 | if (result) | |
624 | goto exit; | |
625 | ||
626 | lockflags = hfs_systemfile_lock(hfsmp, SFL_ATTRIBUTE, HFS_SHARED_LOCK); | |
627 | ||
628 | result = BTSearchRecord(btfile, iterator, NULL, NULL, NULL); | |
629 | if (result && result != btNotFound) { | |
630 | hfs_systemfile_unlock(hfsmp, lockflags); | |
631 | goto exit; | |
632 | } | |
633 | ||
634 | state.fileID = VTOC(vp)->c_fileid; | |
635 | state.result = 0; | |
636 | state.uio = uio; | |
637 | state.size = 0; | |
638 | ||
639 | /* | |
640 | * Process entries starting just after iterator->key. | |
641 | */ | |
642 | result = BTIterateRecords(btfile, kBTreeNextRecord, iterator, | |
643 | (IterateCallBackProcPtr)listattr_callback, &state); | |
644 | hfs_systemfile_unlock(hfsmp, lockflags); | |
645 | if (uio == NULL) { | |
646 | *ap->a_size += state.size; | |
647 | } | |
648 | exit: | |
649 | FREE(iterator, M_TEMP); | |
650 | ||
651 | if (state.result || result == btNotFound) | |
652 | result = state.result; | |
653 | ||
654 | return MacToVFSError(result); | |
655 | } | |
656 | ||
657 | ||
658 | /* | |
659 | * Callback - called for each attribute | |
660 | */ | |
661 | static int | |
662 | listattr_callback(const HFSPlusAttrKey *key, __unused const HFSPlusAttrData *data, struct listattr_callback_state *state) | |
663 | { | |
664 | char attrname[XATTR_MAXNAMELEN + 1]; | |
665 | size_t bytecount; | |
666 | int result; | |
667 | ||
668 | if (state->fileID != key->fileID) { | |
669 | state->result = 0; | |
670 | return (0); /* stop */ | |
671 | } | |
672 | /* | |
673 | * Skip over non-primary keys | |
674 | */ | |
675 | if (key->startBlock != 0) { | |
676 | return (1); /* continue */ | |
677 | } | |
678 | ||
679 | result = utf8_encodestr(key->attrName, key->attrNameLen * sizeof(UniChar), | |
680 | attrname, &bytecount, sizeof(attrname), 0, 0); | |
681 | if (result) { | |
682 | state->result = result; | |
683 | return (0); /* stop */ | |
684 | } | |
685 | bytecount++; /* account for null termination char */ | |
686 | ||
687 | if (xattr_protected(attrname)) | |
688 | return (1); /* continue */ | |
689 | ||
690 | if (state->uio == NULL) { | |
691 | state->size += bytecount; | |
692 | } else { | |
693 | if (bytecount > uio_resid(state->uio)) { | |
694 | state->result = ERANGE; | |
695 | return (0); /* stop */ | |
696 | } | |
697 | result = uiomove((caddr_t) attrname, bytecount, state->uio); | |
698 | if (result) { | |
699 | state->result = result; | |
700 | return (0); /* stop */ | |
701 | } | |
702 | } | |
703 | return (1); /* continue */ | |
704 | } | |
705 | ||
706 | ||
707 | /* | |
708 | * Remove all the attributes from a cnode. | |
709 | * | |
710 | * A jornal transaction must be already started. | |
711 | * Attributes b-Tree must have exclusive lock held. | |
712 | */ | |
713 | __private_extern__ | |
714 | int | |
715 | hfs_removeallattr(struct hfsmount *hfsmp, u_int32_t fileid) | |
716 | { | |
717 | BTreeIterator *next_iterator, *del_iterator; | |
718 | HFSPlusAttrKey *next_key; | |
719 | struct filefork *btfile; | |
720 | int result, iter_result; | |
721 | ||
722 | if (hfsmp->hfs_attribute_vp == NULL) { | |
723 | return (0); | |
724 | } | |
725 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
726 | ||
727 | MALLOC(next_iterator, BTreeIterator *, sizeof(BTreeIterator) * 2, M_TEMP, M_WAITOK); | |
728 | bzero(next_iterator, sizeof(BTreeIterator) * 2); | |
729 | del_iterator = &next_iterator[1]; | |
730 | next_key = (HFSPlusAttrKey *)&next_iterator->key; | |
731 | ||
732 | /* | |
733 | * Go to first possible attribute key/record pair | |
734 | */ | |
735 | (void) buildkey(fileid, NULL, next_key); | |
736 | result = BTIterateRecord(btfile, kBTreeNextRecord, next_iterator, NULL, NULL); | |
737 | if (result || next_key->fileID != fileid) { | |
738 | goto exit; | |
739 | } | |
740 | /* Remember iterator of attribute to delete */ | |
741 | bcopy(next_iterator, del_iterator, sizeof(BTreeIterator)); | |
742 | ||
743 | /* Loop until there are no more attributes for this file id */ | |
744 | for(;;) { | |
745 | iter_result = BTIterateRecord(btfile, kBTreeNextRecord, next_iterator, NULL, NULL); | |
746 | ||
747 | /* XXX need to free and extents for record types 0x20 and 0x30 */ | |
748 | result = BTDeleteRecord(btfile, del_iterator); | |
749 | if (result) { | |
750 | goto exit; | |
751 | } | |
752 | if (iter_result) { | |
753 | result = iter_result; | |
754 | break; | |
755 | } | |
756 | if (iter_result || next_key->fileID != fileid) { | |
757 | break; /* end of attributes for this file id */ | |
758 | } | |
759 | bcopy(next_iterator, del_iterator, sizeof(BTreeIterator)); | |
760 | } | |
761 | exit: | |
762 | (void) BTFlushPath(btfile); | |
763 | ||
764 | if (result == btNotFound) { | |
765 | result = 0; | |
766 | } | |
767 | FREE(next_iterator, M_TEMP); | |
768 | return (result); | |
769 | } | |
770 | ||
771 | /* | |
772 | * Enable/Disable extended security (ACLs). | |
773 | */ | |
774 | __private_extern__ | |
775 | int | |
776 | hfs_setextendedsecurity(struct hfsmount *hfsmp, int state) | |
777 | { | |
778 | struct BTreeIterator * iterator = NULL; | |
779 | struct filefork *btfile; | |
780 | int lockflags; | |
781 | int result; | |
782 | ||
783 | if (hfsmp->hfs_flags & HFS_STANDARD) { | |
784 | return (ENOTSUP); | |
785 | } | |
786 | ||
787 | MALLOC(iterator, BTreeIterator *, sizeof(*iterator), M_TEMP, M_WAITOK); | |
788 | bzero(iterator, sizeof(*iterator)); | |
789 | ||
790 | /* | |
791 | * Build a b-tree key. | |
792 | * We use the root's parent id (1) to hold this volume attribute. | |
793 | */ | |
794 | (void) buildkey(kHFSRootParentID, XATTR_EXTENDEDSECURITY_NAME, | |
795 | (HFSPlusAttrKey *)&iterator->key); | |
796 | ||
797 | /* Start a transaction for our changes. */ | |
798 | if (hfs_start_transaction(hfsmp) != 0) { | |
799 | result = EINVAL; | |
800 | goto exit2; | |
801 | } | |
802 | /* | |
803 | * If there isn't an attributes b-tree then create one. | |
804 | */ | |
805 | if (hfsmp->hfs_attribute_vp == NULL) { | |
806 | lockflags = hfs_systemfile_lock(hfsmp, SFL_EXTENTS, HFS_EXCLUSIVE_LOCK); | |
807 | result = hfs_create_attr_btree(hfsmp, ATTRIBUTE_FILE_NODE_SIZE, | |
808 | getnodecount(hfsmp, ATTRIBUTE_FILE_NODE_SIZE)); | |
809 | hfs_systemfile_unlock(hfsmp, lockflags); | |
810 | if (result) { | |
811 | goto exit1; | |
812 | } | |
813 | } | |
814 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
815 | ||
816 | lockflags = hfs_systemfile_lock(hfsmp, SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK); | |
817 | ||
818 | if (state == 0) { | |
819 | /* Remove the attribute. */ | |
820 | result = BTDeleteRecord(btfile, iterator); | |
821 | if (result == btNotFound) | |
822 | result = 0; | |
823 | } else { | |
824 | FSBufferDescriptor btdata; | |
825 | HFSPlusAttrData attrdata; | |
826 | UInt16 datasize; | |
827 | ||
828 | datasize = sizeof(attrdata); | |
829 | btdata.bufferAddress = &attrdata; | |
830 | btdata.itemSize = datasize; | |
831 | btdata.itemCount = 1; | |
832 | attrdata.recordType = kHFSPlusAttrInlineData; | |
833 | attrdata.reserved[0] = 0; | |
834 | attrdata.reserved[1] = 0; | |
835 | attrdata.attrSize = 2; | |
836 | attrdata.attrData[0] = 0; | |
837 | attrdata.attrData[1] = 0; | |
838 | ||
839 | /* Insert the attribute. */ | |
840 | result = BTInsertRecord(btfile, iterator, &btdata, datasize); | |
841 | if (result == btExists) | |
842 | result = 0; | |
843 | } | |
844 | (void) BTFlushPath(btfile); | |
845 | ||
846 | hfs_systemfile_unlock(hfsmp, lockflags); | |
847 | exit1: | |
848 | /* Finish the transaction of our changes. */ | |
849 | hfs_end_transaction(hfsmp); | |
850 | exit2: | |
851 | FREE(iterator, M_TEMP); | |
852 | ||
853 | if (result == 0) { | |
854 | if (state == 0) | |
855 | vfs_clearextendedsecurity(HFSTOVFS(hfsmp)); | |
856 | else | |
857 | vfs_setextendedsecurity(HFSTOVFS(hfsmp)); | |
858 | printf("hfs: %s extended security on %s\n", | |
859 | state == 0 ? "disabling" : "enabling", hfsmp->vcbVN); | |
860 | } | |
861 | ||
862 | return MacToVFSError(result); | |
863 | } | |
864 | ||
865 | /* | |
866 | * Check for extended security (ACLs). | |
867 | */ | |
868 | __private_extern__ | |
869 | void | |
870 | hfs_checkextendedsecurity(struct hfsmount *hfsmp) | |
871 | { | |
872 | struct BTreeIterator * iterator; | |
873 | struct filefork *btfile; | |
874 | int lockflags; | |
875 | int result; | |
876 | ||
877 | if (hfsmp->hfs_flags & HFS_STANDARD || | |
878 | hfsmp->hfs_attribute_vp == NULL) { | |
879 | return; | |
880 | } | |
881 | ||
882 | MALLOC(iterator, BTreeIterator *, sizeof(*iterator), M_TEMP, M_WAITOK); | |
883 | bzero(iterator, sizeof(*iterator)); | |
884 | ||
885 | /* | |
886 | * Build a b-tree key. | |
887 | * We use the root's parent id (1) to hold this volume attribute. | |
888 | */ | |
889 | (void) buildkey(kHFSRootParentID, XATTR_EXTENDEDSECURITY_NAME, | |
890 | (HFSPlusAttrKey *)&iterator->key); | |
891 | ||
892 | btfile = VTOF(hfsmp->hfs_attribute_vp); | |
893 | ||
894 | lockflags = hfs_systemfile_lock(hfsmp, SFL_ATTRIBUTE, HFS_EXCLUSIVE_LOCK); | |
895 | ||
896 | /* Check for our attribute. */ | |
897 | result = BTSearchRecord(btfile, iterator, NULL, NULL, NULL); | |
898 | ||
899 | hfs_systemfile_unlock(hfsmp, lockflags); | |
900 | FREE(iterator, M_TEMP); | |
901 | ||
902 | if (result == 0) { | |
903 | vfs_setextendedsecurity(HFSTOVFS(hfsmp)); | |
904 | printf("hfs mount: enabling extended security on %s\n", hfsmp->vcbVN); | |
905 | } | |
906 | } | |
907 | ||
908 | ||
909 | /* | |
910 | * hfs_attrkeycompare - compare two attribute b-tree keys. | |
911 | * | |
912 | * The name portion of the key is compared using a 16-bit binary comparison. | |
913 | * This is called from the b-tree code. | |
914 | */ | |
915 | __private_extern__ | |
916 | int | |
917 | hfs_attrkeycompare(HFSPlusAttrKey *searchKey, HFSPlusAttrKey *trialKey) | |
918 | { | |
919 | u_int32_t searchFileID, trialFileID; | |
920 | int result; | |
921 | ||
922 | searchFileID = searchKey->fileID; | |
923 | trialFileID = trialKey->fileID; | |
924 | result = 0; | |
925 | ||
926 | if (searchFileID > trialFileID) { | |
927 | ++result; | |
928 | } else if (searchFileID < trialFileID) { | |
929 | --result; | |
930 | } else { | |
931 | u_int16_t * str1 = &searchKey->attrName[0]; | |
932 | u_int16_t * str2 = &trialKey->attrName[0]; | |
933 | int length1 = searchKey->attrNameLen; | |
934 | int length2 = trialKey->attrNameLen; | |
935 | u_int16_t c1, c2; | |
936 | int length; | |
937 | ||
938 | if (length1 < length2) { | |
939 | length = length1; | |
940 | --result; | |
941 | } else if (length1 > length2) { | |
942 | length = length2; | |
943 | ++result; | |
944 | } else { | |
945 | length = length1; | |
946 | } | |
947 | ||
948 | while (length--) { | |
949 | c1 = *(str1++); | |
950 | c2 = *(str2++); | |
951 | ||
952 | if (c1 > c2) { | |
953 | result = 1; | |
954 | break; | |
955 | } | |
956 | if (c1 < c2) { | |
957 | result = -1; | |
958 | break; | |
959 | } | |
960 | } | |
961 | if (result) | |
962 | return (result); | |
963 | /* | |
964 | * Names are equal; compare startBlock | |
965 | */ | |
966 | if (searchKey->startBlock == trialKey->startBlock) | |
967 | return (0); | |
968 | else | |
969 | return (searchKey->startBlock < trialKey->startBlock ? -1 : 1); | |
970 | } | |
971 | ||
972 | return result; | |
973 | } | |
974 | ||
975 | ||
976 | /* | |
977 | * buildkey - build an Attribute b-tree key | |
978 | */ | |
979 | static int | |
980 | buildkey(u_int32_t fileID, const char *attrname, HFSPlusAttrKey *key) | |
981 | { | |
982 | int result = 0; | |
983 | size_t unicodeBytes = 0; | |
984 | ||
985 | if (attrname != NULL) { | |
986 | /* | |
987 | * Convert filename from UTF-8 into Unicode | |
988 | */ | |
989 | result = utf8_decodestr(attrname, strlen(attrname), key->attrName, | |
990 | &unicodeBytes, sizeof(key->attrName), 0, 0); | |
991 | if (result) { | |
992 | if (result != ENAMETOOLONG) | |
993 | result = EINVAL; /* name has invalid characters */ | |
994 | return (result); | |
995 | } | |
996 | key->attrNameLen = unicodeBytes / sizeof(UniChar); | |
997 | key->keyLength = kHFSPlusAttrKeyMinimumLength + unicodeBytes; | |
998 | } else { | |
999 | key->attrNameLen = 0; | |
1000 | key->keyLength = kHFSPlusAttrKeyMinimumLength; | |
1001 | } | |
1002 | key->pad = 0; | |
1003 | key->fileID = fileID; | |
1004 | key->startBlock = 0; | |
1005 | ||
1006 | return (0); | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * getnodecount - calculate starting node count for attributes b-tree. | |
1011 | */ | |
1012 | static int | |
1013 | getnodecount(struct hfsmount *hfsmp, size_t nodesize) | |
1014 | { | |
1015 | int avedatasize; | |
1016 | int recpernode; | |
1017 | int count; | |
1018 | ||
1019 | avedatasize = sizeof(u_int16_t); /* index slot */ | |
1020 | avedatasize += kHFSPlusAttrKeyMinimumLength + HFS_AVERAGE_NAME_SIZE * sizeof(u_int16_t); | |
1021 | avedatasize += sizeof(HFSPlusAttrData) + 32; | |
1022 | ||
1023 | recpernode = (nodesize - sizeof(BTNodeDescriptor)) / avedatasize; | |
1024 | ||
1025 | count = (hfsmp->hfs_filecount + hfsmp->hfs_dircount) / 8; | |
1026 | count /= recpernode; | |
1027 | ||
1028 | /* XXX should also consider volume size XXX */ | |
1029 | ||
1030 | return (MAX(count, (int)(1024 * 1024) / (int)nodesize)); | |
1031 | } | |
1032 | ||
1033 | ||
1034 | /* | |
1035 | * getmaxinlineattrsize - calculate maximum inline attribute size. | |
1036 | * | |
1037 | * This yields 3,802 bytes for an 8K node size. | |
1038 | */ | |
1039 | static size_t | |
1040 | getmaxinlineattrsize(struct vnode * attrvp) | |
1041 | { | |
1042 | struct BTreeInfoRec btinfo; | |
1043 | size_t nodesize = ATTRIBUTE_FILE_NODE_SIZE; | |
1044 | size_t maxsize; | |
1045 | ||
1046 | if (attrvp != NULL) { | |
1047 | (void) hfs_lock(VTOC(attrvp), HFS_SHARED_LOCK); | |
1048 | if (BTGetInformation(VTOF(attrvp), 0, &btinfo) == 0) | |
1049 | nodesize = btinfo.nodeSize; | |
1050 | hfs_unlock(VTOC(attrvp)); | |
1051 | } | |
1052 | maxsize = nodesize; | |
1053 | maxsize -= sizeof(BTNodeDescriptor); /* minus node descriptor */ | |
1054 | maxsize -= 3 * sizeof(UInt16); /* minus 3 index slots */ | |
1055 | maxsize /= 2; /* 2 key/rec pairs minumum */ | |
1056 | maxsize -= sizeof(HFSPlusAttrKey); /* minus maximum key size */ | |
1057 | maxsize -= sizeof(HFSPlusAttrData) - 2; /* minus data header */ | |
1058 | maxsize &= 0xFFFFFFFE; /* multiple of 2 bytes */ | |
1059 | ||
1060 | return (maxsize); | |
1061 | } | |
1062 | ||
1063 |