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[PATCH] ext3: fix log_do_checkpoint() assertion failure
[linux-2.6/pdupreez.git] / fs / xfs / xfs_attr_leaf.c
blobb11256e58bf4f23911c4b6f787a46ade1c93fe93
1 /*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32 /*
33 * xfs_attr_leaf.c
34 *
35 * GROT: figure out how to recover gracefully when bmap returns ENOSPC.
36 */
37
38 #include "xfs.h"
39
40 #include "xfs_macros.h"
41 #include "xfs_types.h"
42 #include "xfs_inum.h"
43 #include "xfs_log.h"
44 #include "xfs_trans.h"
45 #include "xfs_sb.h"
46 #include "xfs_ag.h"
47 #include "xfs_dir.h"
48 #include "xfs_dir2.h"
49 #include "xfs_dmapi.h"
50 #include "xfs_mount.h"
51 #include "xfs_alloc_btree.h"
52 #include "xfs_bmap_btree.h"
53 #include "xfs_ialloc_btree.h"
54 #include "xfs_alloc.h"
55 #include "xfs_btree.h"
56 #include "xfs_attr_sf.h"
57 #include "xfs_dir_sf.h"
58 #include "xfs_dir2_sf.h"
59 #include "xfs_dinode.h"
60 #include "xfs_inode_item.h"
61 #include "xfs_inode.h"
62 #include "xfs_bmap.h"
63 #include "xfs_da_btree.h"
64 #include "xfs_attr.h"
65 #include "xfs_attr_leaf.h"
66 #include "xfs_error.h"
67 #include "xfs_bit.h"
68
69 /*
70 * xfs_attr_leaf.c
71 *
72 * Routines to implement leaf blocks of attributes as Btrees of hashed names.
73 */
74
75 /*========================================================================
76 * Function prototypes for the kernel.
77 *========================================================================*/
78
79 /*
80 * Routines used for growing the Btree.
81 */
82 STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
83 int freemap_index);
84 STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer);
85 STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state,
86 xfs_da_state_blk_t *blk1,
87 xfs_da_state_blk_t *blk2);
88 STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
89 xfs_da_state_blk_t *leaf_blk_1,
90 xfs_da_state_blk_t *leaf_blk_2,
91 int *number_entries_in_blk1,
92 int *number_usedbytes_in_blk1);
93
94 /*
95 * Utility routines.
96 */
97 STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf,
98 int src_start,
99 xfs_attr_leafblock_t *dst_leaf,
100 int dst_start, int move_count,
101 xfs_mount_t *mp);
102
103
104 /*========================================================================
105 * External routines when dirsize < XFS_LITINO(mp).
106 *========================================================================*/
107
108 /*
109 * Create the initial contents of a shortform attribute list.
110 */
111 int
112 xfs_attr_shortform_create(xfs_da_args_t *args)
113 {
114 xfs_attr_sf_hdr_t *hdr;
115 xfs_inode_t *dp;
116 xfs_ifork_t *ifp;
117
118 dp = args->dp;
119 ASSERT(dp != NULL);
120 ifp = dp->i_afp;
121 ASSERT(ifp != NULL);
122 ASSERT(ifp->if_bytes == 0);
123 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) {
124 ifp->if_flags &= ~XFS_IFEXTENTS; /* just in case */
125 dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL;
126 ifp->if_flags |= XFS_IFINLINE;
127 } else {
128 ASSERT(ifp->if_flags & XFS_IFINLINE);
129 }
130 xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
131 hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data;
132 hdr->count = 0;
133 INT_SET(hdr->totsize, ARCH_CONVERT, sizeof(*hdr));
134 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
135 return(0);
136 }
137
138 /*
139 * Add a name/value pair to the shortform attribute list.
140 * Overflow from the inode has already been checked for.
141 */
142 int
143 xfs_attr_shortform_add(xfs_da_args_t *args)
144 {
145 xfs_attr_shortform_t *sf;
146 xfs_attr_sf_entry_t *sfe;
147 int i, offset, size;
148 xfs_inode_t *dp;
149 xfs_ifork_t *ifp;
150
151 dp = args->dp;
152 ifp = dp->i_afp;
153 ASSERT(ifp->if_flags & XFS_IFINLINE);
154 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
155 sfe = &sf->list[0];
156 for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
157 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
158 if (sfe->namelen != args->namelen)
159 continue;
160 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
161 continue;
162 if (((args->flags & ATTR_SECURE) != 0) !=
163 ((sfe->flags & XFS_ATTR_SECURE) != 0))
164 continue;
165 if (((args->flags & ATTR_ROOT) != 0) !=
166 ((sfe->flags & XFS_ATTR_ROOT) != 0))
167 continue;
168 return(XFS_ERROR(EEXIST));
169 }
170
171 offset = (char *)sfe - (char *)sf;
172 size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
173 xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
174 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
175 sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
176
177 sfe->namelen = args->namelen;
178 INT_SET(sfe->valuelen, ARCH_CONVERT, args->valuelen);
179 sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
180 ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
181 memcpy(sfe->nameval, args->name, args->namelen);
182 memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);
183 INT_MOD(sf->hdr.count, ARCH_CONVERT, 1);
184 INT_MOD(sf->hdr.totsize, ARCH_CONVERT, size);
185 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
186
187 return(0);
188 }
189
190 /*
191 * Remove a name from the shortform attribute list structure.
192 */
193 int
194 xfs_attr_shortform_remove(xfs_da_args_t *args)
195 {
196 xfs_attr_shortform_t *sf;
197 xfs_attr_sf_entry_t *sfe;
198 int base, size=0, end, totsize, i;
199 xfs_inode_t *dp;
200
201 /*
202 * Remove the attribute.
203 */
204 dp = args->dp;
205 base = sizeof(xfs_attr_sf_hdr_t);
206 sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
207 sfe = &sf->list[0];
208 for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
209 sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
210 base += size, i++) {
211 size = XFS_ATTR_SF_ENTSIZE(sfe);
212 if (sfe->namelen != args->namelen)
213 continue;
214 if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
215 continue;
216 if (((args->flags & ATTR_SECURE) != 0) !=
217 ((sfe->flags & XFS_ATTR_SECURE) != 0))
218 continue;
219 if (((args->flags & ATTR_ROOT) != 0) !=
220 ((sfe->flags & XFS_ATTR_ROOT) != 0))
221 continue;
222 break;
223 }
224 if (i == INT_GET(sf->hdr.count, ARCH_CONVERT))
225 return(XFS_ERROR(ENOATTR));
226
227 end = base + size;
228 totsize = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
229 if (end != totsize) {
230 memmove(&((char *)sf)[base], &((char *)sf)[end],
231 totsize - end);
232 }
233 INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
234 INT_MOD(sf->hdr.totsize, ARCH_CONVERT, -size);
235 xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
236 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
237
238 return(0);
239 }
240
241 /*
242 * Look up a name in a shortform attribute list structure.
243 */
244 /*ARGSUSED*/
245 int
246 xfs_attr_shortform_lookup(xfs_da_args_t *args)
247 {
248 xfs_attr_shortform_t *sf;
249 xfs_attr_sf_entry_t *sfe;
250 int i;
251 xfs_ifork_t *ifp;
252
253 ifp = args->dp->i_afp;
254 ASSERT(ifp->if_flags & XFS_IFINLINE);
255 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
256 sfe = &sf->list[0];
257 for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
258 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
259 if (sfe->namelen != args->namelen)
260 continue;
261 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
262 continue;
263 if (((args->flags & ATTR_SECURE) != 0) !=
264 ((sfe->flags & XFS_ATTR_SECURE) != 0))
265 continue;
266 if (((args->flags & ATTR_ROOT) != 0) !=
267 ((sfe->flags & XFS_ATTR_ROOT) != 0))
268 continue;
269 return(XFS_ERROR(EEXIST));
270 }
271 return(XFS_ERROR(ENOATTR));
272 }
273
274 /*
275 * Look up a name in a shortform attribute list structure.
276 */
277 /*ARGSUSED*/
278 int
279 xfs_attr_shortform_getvalue(xfs_da_args_t *args)
280 {
281 xfs_attr_shortform_t *sf;
282 xfs_attr_sf_entry_t *sfe;
283 int i;
284
285 ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE);
286 sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
287 sfe = &sf->list[0];
288 for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
289 sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
290 if (sfe->namelen != args->namelen)
291 continue;
292 if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
293 continue;
294 if (((args->flags & ATTR_SECURE) != 0) !=
295 ((sfe->flags & XFS_ATTR_SECURE) != 0))
296 continue;
297 if (((args->flags & ATTR_ROOT) != 0) !=
298 ((sfe->flags & XFS_ATTR_ROOT) != 0))
299 continue;
300 if (args->flags & ATTR_KERNOVAL) {
301 args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
302 return(XFS_ERROR(EEXIST));
303 }
304 if (args->valuelen < INT_GET(sfe->valuelen, ARCH_CONVERT)) {
305 args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
306 return(XFS_ERROR(ERANGE));
307 }
308 args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
309 memcpy(args->value, &sfe->nameval[args->namelen],
310 args->valuelen);
311 return(XFS_ERROR(EEXIST));
312 }
313 return(XFS_ERROR(ENOATTR));
314 }
315
316 /*
317 * Convert from using the shortform to the leaf.
318 */
319 int
320 xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
321 {
322 xfs_inode_t *dp;
323 xfs_attr_shortform_t *sf;
324 xfs_attr_sf_entry_t *sfe;
325 xfs_da_args_t nargs;
326 char *tmpbuffer;
327 int error, i, size;
328 xfs_dablk_t blkno;
329 xfs_dabuf_t *bp;
330 xfs_ifork_t *ifp;
331
332 dp = args->dp;
333 ifp = dp->i_afp;
334 sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
335 size = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
336 tmpbuffer = kmem_alloc(size, KM_SLEEP);
337 ASSERT(tmpbuffer != NULL);
338 memcpy(tmpbuffer, ifp->if_u1.if_data, size);
339 sf = (xfs_attr_shortform_t *)tmpbuffer;
340
341 xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
342 bp = NULL;
343 error = xfs_da_grow_inode(args, &blkno);
344 if (error) {
345 /*
346 * If we hit an IO error middle of the transaction inside
347 * grow_inode(), we may have inconsistent data. Bail out.
348 */
349 if (error == EIO)
350 goto out;
351 xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
352 memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
353 goto out;
354 }
355
356 ASSERT(blkno == 0);
357 error = xfs_attr_leaf_create(args, blkno, &bp);
358 if (error) {
359 error = xfs_da_shrink_inode(args, 0, bp);
360 bp = NULL;
361 if (error)
362 goto out;
363 xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
364 memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
365 goto out;
366 }
367
368 memset((char *)&nargs, 0, sizeof(nargs));
369 nargs.dp = dp;
370 nargs.firstblock = args->firstblock;
371 nargs.flist = args->flist;
372 nargs.total = args->total;
373 nargs.whichfork = XFS_ATTR_FORK;
374 nargs.trans = args->trans;
375 nargs.oknoent = 1;
376
377 sfe = &sf->list[0];
378 for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
379 nargs.name = (char *)sfe->nameval;
380 nargs.namelen = sfe->namelen;
381 nargs.value = (char *)&sfe->nameval[nargs.namelen];
382 nargs.valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
383 nargs.hashval = xfs_da_hashname((char *)sfe->nameval,
384 sfe->namelen);
385 nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
386 ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
387 error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */
388 ASSERT(error == ENOATTR);
389 error = xfs_attr_leaf_add(bp, &nargs);
390 ASSERT(error != ENOSPC);
391 if (error)
392 goto out;
393 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
394 }
395 error = 0;
396
397 out:
398 if(bp)
399 xfs_da_buf_done(bp);
400 kmem_free(tmpbuffer, size);
401 return(error);
402 }
403
404 STATIC int
405 xfs_attr_shortform_compare(const void *a, const void *b)
406 {
407 xfs_attr_sf_sort_t *sa, *sb;
408
409 sa = (xfs_attr_sf_sort_t *)a;
410 sb = (xfs_attr_sf_sort_t *)b;
411 if (INT_GET(sa->hash, ARCH_CONVERT)
412 < INT_GET(sb->hash, ARCH_CONVERT)) {
413 return(-1);
414 } else if (INT_GET(sa->hash, ARCH_CONVERT)
415 > INT_GET(sb->hash, ARCH_CONVERT)) {
416 return(1);
417 } else {
418 return(sa->entno - sb->entno);
419 }
420 }
421
422 /*
423 * Copy out entries of shortform attribute lists for attr_list().
424 * Shortform atrtribute lists are not stored in hashval sorted order.
425 * If the output buffer is not large enough to hold them all, then we
426 * we have to calculate each entries' hashvalue and sort them before
427 * we can begin returning them to the user.
428 */
429 /*ARGSUSED*/
430 int
431 xfs_attr_shortform_list(xfs_attr_list_context_t *context)
432 {
433 attrlist_cursor_kern_t *cursor;
434 xfs_attr_sf_sort_t *sbuf, *sbp;
435 xfs_attr_shortform_t *sf;
436 xfs_attr_sf_entry_t *sfe;
437 xfs_inode_t *dp;
438 int sbsize, nsbuf, count, i;
439
440 ASSERT(context != NULL);
441 dp = context->dp;
442 ASSERT(dp != NULL);
443 ASSERT(dp->i_afp != NULL);
444 sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
445 ASSERT(sf != NULL);
446 if (!sf->hdr.count)
447 return(0);
448 cursor = context->cursor;
449 ASSERT(cursor != NULL);
450
451 xfs_attr_trace_l_c("sf start", context);
452
453 /*
454 * If the buffer is large enough, do not bother with sorting.
455 * Note the generous fudge factor of 16 overhead bytes per entry.
456 */
457 if ((dp->i_afp->if_bytes + INT_GET(sf->hdr.count, ARCH_CONVERT) * 16)
458 < context->bufsize) {
459 for (i = 0, sfe = &sf->list[0];
460 i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
461 attrnames_t *namesp;
462
463 if (((context->flags & ATTR_SECURE) != 0) !=
464 ((sfe->flags & XFS_ATTR_SECURE) != 0) &&
465 !(context->flags & ATTR_KERNORMALS)) {
466 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
467 continue;
468 }
469 if (((context->flags & ATTR_ROOT) != 0) !=
470 ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
471 !(context->flags & ATTR_KERNROOTLS)) {
472 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
473 continue;
474 }
475 namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure:
476 ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted :
477 &attr_user);
478 if (context->flags & ATTR_KERNOVAL) {
479 ASSERT(context->flags & ATTR_KERNAMELS);
480 context->count += namesp->attr_namelen +
481 INT_GET(sfe->namelen, ARCH_CONVERT) + 1;
482 }
483 else {
484 if (xfs_attr_put_listent(context, namesp,
485 (char *)sfe->nameval,
486 (int)sfe->namelen,
487 (int)INT_GET(sfe->valuelen,
488 ARCH_CONVERT)))
489 break;
490 }
491 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
492 }
493 xfs_attr_trace_l_c("sf big-gulp", context);
494 return(0);
495 }
496
497 /*
498 * It didn't all fit, so we have to sort everything on hashval.
499 */
500 sbsize = INT_GET(sf->hdr.count, ARCH_CONVERT) * sizeof(*sbuf);
501 sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
502
503 /*
504 * Scan the attribute list for the rest of the entries, storing
505 * the relevant info from only those that match into a buffer.
506 */
507 nsbuf = 0;
508 for (i = 0, sfe = &sf->list[0];
509 i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
510 if (unlikely(
511 ((char *)sfe < (char *)sf) ||
512 ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
513 XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
514 XFS_ERRLEVEL_LOW,
515 context->dp->i_mount, sfe);
516 xfs_attr_trace_l_c("sf corrupted", context);
517 kmem_free(sbuf, sbsize);
518 return XFS_ERROR(EFSCORRUPTED);
519 }
520 if (((context->flags & ATTR_SECURE) != 0) !=
521 ((sfe->flags & XFS_ATTR_SECURE) != 0) &&
522 !(context->flags & ATTR_KERNORMALS)) {
523 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
524 continue;
525 }
526 if (((context->flags & ATTR_ROOT) != 0) !=
527 ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
528 !(context->flags & ATTR_KERNROOTLS)) {
529 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
530 continue;
531 }
532 sbp->entno = i;
533 INT_SET(sbp->hash, ARCH_CONVERT,
534 xfs_da_hashname((char *)sfe->nameval, sfe->namelen));
535 sbp->name = (char *)sfe->nameval;
536 sbp->namelen = sfe->namelen;
537 /* These are bytes, and both on-disk, don't endian-flip */
538 sbp->valuelen = sfe->valuelen;
539 sbp->flags = sfe->flags;
540 sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
541 sbp++;
542 nsbuf++;
543 }
544
545 /*
546 * Sort the entries on hash then entno.
547 */
548 qsort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);
549
550 /*
551 * Re-find our place IN THE SORTED LIST.
552 */
553 count = 0;
554 cursor->initted = 1;
555 cursor->blkno = 0;
556 for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
557 if (INT_GET(sbp->hash, ARCH_CONVERT) == cursor->hashval) {
558 if (cursor->offset == count) {
559 break;
560 }
561 count++;
562 } else if (INT_GET(sbp->hash, ARCH_CONVERT) > cursor->hashval) {
563 break;
564 }
565 }
566 if (i == nsbuf) {
567 kmem_free(sbuf, sbsize);
568 xfs_attr_trace_l_c("blk end", context);
569 return(0);
570 }
571
572 /*
573 * Loop putting entries into the user buffer.
574 */
575 for ( ; i < nsbuf; i++, sbp++) {
576 attrnames_t *namesp;
577
578 namesp = (sbp->flags & XFS_ATTR_SECURE) ? &attr_secure :
579 ((sbp->flags & XFS_ATTR_ROOT) ? &attr_trusted :
580 &attr_user);
581
582 if (cursor->hashval != INT_GET(sbp->hash, ARCH_CONVERT)) {
583 cursor->hashval = INT_GET(sbp->hash, ARCH_CONVERT);
584 cursor->offset = 0;
585 }
586 if (context->flags & ATTR_KERNOVAL) {
587 ASSERT(context->flags & ATTR_KERNAMELS);
588 context->count += namesp->attr_namelen +
589 sbp->namelen + 1;
590 } else {
591 if (xfs_attr_put_listent(context, namesp,
592 sbp->name, sbp->namelen,
593 INT_GET(sbp->valuelen, ARCH_CONVERT)))
594 break;
595 }
596 cursor->offset++;
597 }
598
599 kmem_free(sbuf, sbsize);
600 xfs_attr_trace_l_c("sf E-O-F", context);
601 return(0);
602 }
603
604 /*
605 * Check a leaf attribute block to see if all the entries would fit into
606 * a shortform attribute list.
607 */
608 int
609 xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp)
610 {
611 xfs_attr_leafblock_t *leaf;
612 xfs_attr_leaf_entry_t *entry;
613 xfs_attr_leaf_name_local_t *name_loc;
614 int bytes, i;
615
616 leaf = bp->data;
617 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
618 == XFS_ATTR_LEAF_MAGIC);
619
620 entry = &leaf->entries[0];
621 bytes = sizeof(struct xfs_attr_sf_hdr);
622 for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
623 if (entry->flags & XFS_ATTR_INCOMPLETE)
624 continue; /* don't copy partial entries */
625 if (!(entry->flags & XFS_ATTR_LOCAL))
626 return(0);
627 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
628 if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
629 return(0);
630 if (INT_GET(name_loc->valuelen, ARCH_CONVERT) >= XFS_ATTR_SF_ENTSIZE_MAX)
631 return(0);
632 bytes += sizeof(struct xfs_attr_sf_entry)-1
633 + name_loc->namelen
634 + INT_GET(name_loc->valuelen, ARCH_CONVERT);
635 }
636 return( bytes < XFS_IFORK_ASIZE(dp) );
637 }
638
639 /*
640 * Convert a leaf attribute list to shortform attribute list
641 */
642 int
643 xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args)
644 {
645 xfs_attr_leafblock_t *leaf;
646 xfs_attr_leaf_entry_t *entry;
647 xfs_attr_leaf_name_local_t *name_loc;
648 xfs_da_args_t nargs;
649 xfs_inode_t *dp;
650 char *tmpbuffer;
651 int error, i;
652
653 dp = args->dp;
654 tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
655 ASSERT(tmpbuffer != NULL);
656
657 ASSERT(bp != NULL);
658 memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
659 leaf = (xfs_attr_leafblock_t *)tmpbuffer;
660 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
661 == XFS_ATTR_LEAF_MAGIC);
662 memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
663
664 /*
665 * Clean out the prior contents of the attribute list.
666 */
667 error = xfs_da_shrink_inode(args, 0, bp);
668 if (error)
669 goto out;
670 error = xfs_attr_shortform_create(args);
671 if (error)
672 goto out;
673
674 /*
675 * Copy the attributes
676 */
677 memset((char *)&nargs, 0, sizeof(nargs));
678 nargs.dp = dp;
679 nargs.firstblock = args->firstblock;
680 nargs.flist = args->flist;
681 nargs.total = args->total;
682 nargs.whichfork = XFS_ATTR_FORK;
683 nargs.trans = args->trans;
684 nargs.oknoent = 1;
685 entry = &leaf->entries[0];
686 for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
687 if (entry->flags & XFS_ATTR_INCOMPLETE)
688 continue; /* don't copy partial entries */
689 if (!entry->nameidx)
690 continue;
691 ASSERT(entry->flags & XFS_ATTR_LOCAL);
692 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
693 nargs.name = (char *)name_loc->nameval;
694 nargs.namelen = name_loc->namelen;
695 nargs.value = (char *)&name_loc->nameval[nargs.namelen];
696 nargs.valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT);
697 nargs.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
698 nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
699 ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
700 xfs_attr_shortform_add(&nargs);
701 }
702 error = 0;
703
704 out:
705 kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
706 return(error);
707 }
708
709 /*
710 * Convert from using a single leaf to a root node and a leaf.
711 */
712 int
713 xfs_attr_leaf_to_node(xfs_da_args_t *args)
714 {
715 xfs_attr_leafblock_t *leaf;
716 xfs_da_intnode_t *node;
717 xfs_inode_t *dp;
718 xfs_dabuf_t *bp1, *bp2;
719 xfs_dablk_t blkno;
720 int error;
721
722 dp = args->dp;
723 bp1 = bp2 = NULL;
724 error = xfs_da_grow_inode(args, &blkno);
725 if (error)
726 goto out;
727 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
728 XFS_ATTR_FORK);
729 if (error)
730 goto out;
731 ASSERT(bp1 != NULL);
732 bp2 = NULL;
733 error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2,
734 XFS_ATTR_FORK);
735 if (error)
736 goto out;
737 ASSERT(bp2 != NULL);
738 memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
739 xfs_da_buf_done(bp1);
740 bp1 = NULL;
741 xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
742
743 /*
744 * Set up the new root node.
745 */
746 error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
747 if (error)
748 goto out;
749 node = bp1->data;
750 leaf = bp2->data;
751 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
752 == XFS_ATTR_LEAF_MAGIC);
753 /* both on-disk, don't endian-flip twice */
754 node->btree[0].hashval =
755 leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval;
756 INT_SET(node->btree[0].before, ARCH_CONVERT, blkno);
757 INT_SET(node->hdr.count, ARCH_CONVERT, 1);
758 xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1);
759 error = 0;
760 out:
761 if (bp1)
762 xfs_da_buf_done(bp1);
763 if (bp2)
764 xfs_da_buf_done(bp2);
765 return(error);
766 }
767
768
769 /*========================================================================
770 * Routines used for growing the Btree.
771 *========================================================================*/
772
773 /*
774 * Create the initial contents of a leaf attribute list
775 * or a leaf in a node attribute list.
776 */
777 int
778 xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
779 {
780 xfs_attr_leafblock_t *leaf;
781 xfs_attr_leaf_hdr_t *hdr;
782 xfs_inode_t *dp;
783 xfs_dabuf_t *bp;
784 int error;
785
786 dp = args->dp;
787 ASSERT(dp != NULL);
788 error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp,
789 XFS_ATTR_FORK);
790 if (error)
791 return(error);
792 ASSERT(bp != NULL);
793 leaf = bp->data;
794 memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
795 hdr = &leaf->hdr;
796 INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_ATTR_LEAF_MAGIC);
797 INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount));
798 if (!hdr->firstused) {
799 INT_SET(hdr->firstused, ARCH_CONVERT,
800 XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN);
801 }
802
803 INT_SET(hdr->freemap[0].base, ARCH_CONVERT,
804 sizeof(xfs_attr_leaf_hdr_t));
805 INT_SET(hdr->freemap[0].size, ARCH_CONVERT,
806 INT_GET(hdr->firstused, ARCH_CONVERT)
807 - INT_GET(hdr->freemap[0].base,
808 ARCH_CONVERT));
809
810 xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
811
812 *bpp = bp;
813 return(0);
814 }
815
816 /*
817 * Split the leaf node, rebalance, then add the new entry.
818 */
819 int
820 xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
821 xfs_da_state_blk_t *newblk)
822 {
823 xfs_dablk_t blkno;
824 int error;
825
826 /*
827 * Allocate space for a new leaf node.
828 */
829 ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC);
830 error = xfs_da_grow_inode(state->args, &blkno);
831 if (error)
832 return(error);
833 error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp);
834 if (error)
835 return(error);
836 newblk->blkno = blkno;
837 newblk->magic = XFS_ATTR_LEAF_MAGIC;
838
839 /*
840 * Rebalance the entries across the two leaves.
841 * NOTE: rebalance() currently depends on the 2nd block being empty.
842 */
843 xfs_attr_leaf_rebalance(state, oldblk, newblk);
844 error = xfs_da_blk_link(state, oldblk, newblk);
845 if (error)
846 return(error);
847
848 /*
849 * Save info on "old" attribute for "atomic rename" ops, leaf_add()
850 * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the
851 * "new" attrs info. Will need the "old" info to remove it later.
852 *
853 * Insert the "new" entry in the correct block.
854 */
855 if (state->inleaf)
856 error = xfs_attr_leaf_add(oldblk->bp, state->args);
857 else
858 error = xfs_attr_leaf_add(newblk->bp, state->args);
859
860 /*
861 * Update last hashval in each block since we added the name.
862 */
863 oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL);
864 newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL);
865 return(error);
866 }
867
868 /*
869 * Add a name to the leaf attribute list structure.
870 */
871 int
872 xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args)
873 {
874 xfs_attr_leafblock_t *leaf;
875 xfs_attr_leaf_hdr_t *hdr;
876 xfs_attr_leaf_map_t *map;
877 int tablesize, entsize, sum, tmp, i;
878
879 leaf = bp->data;
880 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
881 == XFS_ATTR_LEAF_MAGIC);
882 ASSERT((args->index >= 0)
883 && (args->index <= INT_GET(leaf->hdr.count, ARCH_CONVERT)));
884 hdr = &leaf->hdr;
885 entsize = xfs_attr_leaf_newentsize(args,
886 args->trans->t_mountp->m_sb.sb_blocksize, NULL);
887
888 /*
889 * Search through freemap for first-fit on new name length.
890 * (may need to figure in size of entry struct too)
891 */
892 tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1)
893 * sizeof(xfs_attr_leaf_entry_t)
894 + sizeof(xfs_attr_leaf_hdr_t);
895 map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
896 for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
897 if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) {
898 sum += INT_GET(map->size, ARCH_CONVERT);
899 continue;
900 }
901 if (!map->size)
902 continue; /* no space in this map */
903 tmp = entsize;
904 if (INT_GET(map->base, ARCH_CONVERT)
905 < INT_GET(hdr->firstused, ARCH_CONVERT))
906 tmp += sizeof(xfs_attr_leaf_entry_t);
907 if (INT_GET(map->size, ARCH_CONVERT) >= tmp) {
908 tmp = xfs_attr_leaf_add_work(bp, args, i);
909 return(tmp);
910 }
911 sum += INT_GET(map->size, ARCH_CONVERT);
912 }
913
914 /*
915 * If there are no holes in the address space of the block,
916 * and we don't have enough freespace, then compaction will do us
917 * no good and we should just give up.
918 */
919 if (!hdr->holes && (sum < entsize))
920 return(XFS_ERROR(ENOSPC));
921
922 /*
923 * Compact the entries to coalesce free space.
924 * This may change the hdr->count via dropping INCOMPLETE entries.
925 */
926 xfs_attr_leaf_compact(args->trans, bp);
927
928 /*
929 * After compaction, the block is guaranteed to have only one
930 * free region, in freemap[0]. If it is not big enough, give up.
931 */
932 if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT)
933 < (entsize + sizeof(xfs_attr_leaf_entry_t)))
934 return(XFS_ERROR(ENOSPC));
935
936 return(xfs_attr_leaf_add_work(bp, args, 0));
937 }
938
939 /*
940 * Add a name to a leaf attribute list structure.
941 */
942 STATIC int
943 xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex)
944 {
945 xfs_attr_leafblock_t *leaf;
946 xfs_attr_leaf_hdr_t *hdr;
947 xfs_attr_leaf_entry_t *entry;
948 xfs_attr_leaf_name_local_t *name_loc;
949 xfs_attr_leaf_name_remote_t *name_rmt;
950 xfs_attr_leaf_map_t *map;
951 xfs_mount_t *mp;
952 int tmp, i;
953
954 leaf = bp->data;
955 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
956 == XFS_ATTR_LEAF_MAGIC);
957 hdr = &leaf->hdr;
958 ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE));
959 ASSERT((args->index >= 0)
960 && (args->index <= INT_GET(hdr->count, ARCH_CONVERT)));
961
962 /*
963 * Force open some space in the entry array and fill it in.
964 */
965 entry = &leaf->entries[args->index];
966 if (args->index < INT_GET(hdr->count, ARCH_CONVERT)) {
967 tmp = INT_GET(hdr->count, ARCH_CONVERT) - args->index;
968 tmp *= sizeof(xfs_attr_leaf_entry_t);
969 memmove((char *)(entry+1), (char *)entry, tmp);
970 xfs_da_log_buf(args->trans, bp,
971 XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
972 }
973 INT_MOD(hdr->count, ARCH_CONVERT, 1);
974
975 /*
976 * Allocate space for the new string (at the end of the run).
977 */
978 map = &hdr->freemap[mapindex];
979 mp = args->trans->t_mountp;
980 ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
981 ASSERT((INT_GET(map->base, ARCH_CONVERT) & 0x3) == 0);
982 ASSERT(INT_GET(map->size, ARCH_CONVERT)
983 >= xfs_attr_leaf_newentsize(args,
984 mp->m_sb.sb_blocksize, NULL));
985 ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
986 ASSERT((INT_GET(map->size, ARCH_CONVERT) & 0x3) == 0);
987 INT_MOD(map->size, ARCH_CONVERT,
988 -xfs_attr_leaf_newentsize(args, mp->m_sb.sb_blocksize, &tmp));
989 INT_SET(entry->nameidx, ARCH_CONVERT,
990 INT_GET(map->base, ARCH_CONVERT)
991 + INT_GET(map->size, ARCH_CONVERT));
992 INT_SET(entry->hashval, ARCH_CONVERT, args->hashval);
993 entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
994 entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
995 ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
996 if (args->rename) {
997 entry->flags |= XFS_ATTR_INCOMPLETE;
998 if ((args->blkno2 == args->blkno) &&
999 (args->index2 <= args->index)) {
1000 args->index2++;
1001 }
1002 }
1003 xfs_da_log_buf(args->trans, bp,
1004 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
1005 ASSERT((args->index == 0) || (INT_GET(entry->hashval, ARCH_CONVERT)
1006 >= INT_GET((entry-1)->hashval,
1007 ARCH_CONVERT)));
1008 ASSERT((args->index == INT_GET(hdr->count, ARCH_CONVERT)-1) ||
1009 (INT_GET(entry->hashval, ARCH_CONVERT)
1010 <= (INT_GET((entry+1)->hashval, ARCH_CONVERT))));
1011
1012 /*
1013 * Copy the attribute name and value into the new space.
1014 *
1015 * For "remote" attribute values, simply note that we need to
1016 * allocate space for the "remote" value. We can't actually
1017 * allocate the extents in this transaction, and we can't decide
1018 * which blocks they should be as we might allocate more blocks
1019 * as part of this transaction (a split operation for example).
1020 */
1021 if (entry->flags & XFS_ATTR_LOCAL) {
1022 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
1023 name_loc->namelen = args->namelen;
1024 INT_SET(name_loc->valuelen, ARCH_CONVERT, args->valuelen);
1025 memcpy((char *)name_loc->nameval, args->name, args->namelen);
1026 memcpy((char *)&name_loc->nameval[args->namelen], args->value,
1027 INT_GET(name_loc->valuelen, ARCH_CONVERT));
1028 } else {
1029 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
1030 name_rmt->namelen = args->namelen;
1031 memcpy((char *)name_rmt->name, args->name, args->namelen);
1032 entry->flags |= XFS_ATTR_INCOMPLETE;
1033 /* just in case */
1034 name_rmt->valuelen = 0;
1035 name_rmt->valueblk = 0;
1036 args->rmtblkno = 1;
1037 args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1038 }
1039 xfs_da_log_buf(args->trans, bp,
1040 XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
1041 xfs_attr_leaf_entsize(leaf, args->index)));
1042
1043 /*
1044 * Update the control info for this leaf node
1045 */
1046 if (INT_GET(entry->nameidx, ARCH_CONVERT)
1047 < INT_GET(hdr->firstused, ARCH_CONVERT)) {
1048 /* both on-disk, don't endian-flip twice */
1049 hdr->firstused = entry->nameidx;
1050 }
1051 ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT)
1052 >= ((INT_GET(hdr->count, ARCH_CONVERT)
1053 * sizeof(*entry))+sizeof(*hdr)));
1054 tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1)
1055 * sizeof(xfs_attr_leaf_entry_t)
1056 + sizeof(xfs_attr_leaf_hdr_t);
1057 map = &hdr->freemap[0];
1058 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
1059 if (INT_GET(map->base, ARCH_CONVERT) == tmp) {
1060 INT_MOD(map->base, ARCH_CONVERT,
1061 sizeof(xfs_attr_leaf_entry_t));
1062 INT_MOD(map->size, ARCH_CONVERT,
1063 -sizeof(xfs_attr_leaf_entry_t));
1064 }
1065 }
1066 INT_MOD(hdr->usedbytes, ARCH_CONVERT,
1067 xfs_attr_leaf_entsize(leaf, args->index));
1068 xfs_da_log_buf(args->trans, bp,
1069 XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1070 return(0);
1071 }
1072
1073 /*
1074 * Garbage collect a leaf attribute list block by copying it to a new buffer.
1075 */
1076 STATIC void
1077 xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp)
1078 {
1079 xfs_attr_leafblock_t *leaf_s, *leaf_d;
1080 xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
1081 xfs_mount_t *mp;
1082 char *tmpbuffer;
1083
1084 mp = trans->t_mountp;
1085 tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP);
1086 ASSERT(tmpbuffer != NULL);
1087 memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp));
1088 memset(bp->data, 0, XFS_LBSIZE(mp));
1089
1090 /*
1091 * Copy basic information
1092 */
1093 leaf_s = (xfs_attr_leafblock_t *)tmpbuffer;
1094 leaf_d = bp->data;
1095 hdr_s = &leaf_s->hdr;
1096 hdr_d = &leaf_d->hdr;
1097 hdr_d->info = hdr_s->info; /* struct copy */
1098 INT_SET(hdr_d->firstused, ARCH_CONVERT, XFS_LBSIZE(mp));
1099 /* handle truncation gracefully */
1100 if (!hdr_d->firstused) {
1101 INT_SET(hdr_d->firstused, ARCH_CONVERT,
1102 XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN);
1103 }
1104 hdr_d->usedbytes = 0;
1105 hdr_d->count = 0;
1106 hdr_d->holes = 0;
1107 INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT,
1108 sizeof(xfs_attr_leaf_hdr_t));
1109 INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT,
1110 INT_GET(hdr_d->firstused, ARCH_CONVERT)
1111 - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
1112
1113 /*
1114 * Copy all entry's in the same (sorted) order,
1115 * but allocate name/value pairs packed and in sequence.
1116 */
1117 xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0,
1118 (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp);
1119
1120 xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1);
1121
1122 kmem_free(tmpbuffer, XFS_LBSIZE(mp));
1123 }
1124
1125 /*
1126 * Redistribute the attribute list entries between two leaf nodes,
1127 * taking into account the size of the new entry.
1128 *
1129 * NOTE: if new block is empty, then it will get the upper half of the
1130 * old block. At present, all (one) callers pass in an empty second block.
1131 *
1132 * This code adjusts the args->index/blkno and args->index2/blkno2 fields
1133 * to match what it is doing in splitting the attribute leaf block. Those
1134 * values are used in "atomic rename" operations on attributes. Note that
1135 * the "new" and "old" values can end up in different blocks.
1136 */
1137 STATIC void
1138 xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
1139 xfs_da_state_blk_t *blk2)
1140 {
1141 xfs_da_args_t *args;
1142 xfs_da_state_blk_t *tmp_blk;
1143 xfs_attr_leafblock_t *leaf1, *leaf2;
1144 xfs_attr_leaf_hdr_t *hdr1, *hdr2;
1145 int count, totallen, max, space, swap;
1146
1147 /*
1148 * Set up environment.
1149 */
1150 ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
1151 ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
1152 leaf1 = blk1->bp->data;
1153 leaf2 = blk2->bp->data;
1154 ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
1155 == XFS_ATTR_LEAF_MAGIC);
1156 ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
1157 == XFS_ATTR_LEAF_MAGIC);
1158 args = state->args;
1159
1160 /*
1161 * Check ordering of blocks, reverse if it makes things simpler.
1162 *
1163 * NOTE: Given that all (current) callers pass in an empty
1164 * second block, this code should never set "swap".
1165 */
1166 swap = 0;
1167 if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) {
1168 tmp_blk = blk1;
1169 blk1 = blk2;
1170 blk2 = tmp_blk;
1171 leaf1 = blk1->bp->data;
1172 leaf2 = blk2->bp->data;
1173 swap = 1;
1174 }
1175 hdr1 = &leaf1->hdr;
1176 hdr2 = &leaf2->hdr;
1177
1178 /*
1179 * Examine entries until we reduce the absolute difference in
1180 * byte usage between the two blocks to a minimum. Then get
1181 * the direction to copy and the number of elements to move.
1182 *
1183 * "inleaf" is true if the new entry should be inserted into blk1.
1184 * If "swap" is also true, then reverse the sense of "inleaf".
1185 */
1186 state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2,
1187 &count, &totallen);
1188 if (swap)
1189 state->inleaf = !state->inleaf;
1190
1191 /*
1192 * Move any entries required from leaf to leaf:
1193 */
1194 if (count < INT_GET(hdr1->count, ARCH_CONVERT)) {
1195 /*
1196 * Figure the total bytes to be added to the destination leaf.
1197 */
1198 /* number entries being moved */
1199 count = INT_GET(hdr1->count, ARCH_CONVERT) - count;
1200 space = INT_GET(hdr1->usedbytes, ARCH_CONVERT) - totallen;
1201 space += count * sizeof(xfs_attr_leaf_entry_t);
1202
1203 /*
1204 * leaf2 is the destination, compact it if it looks tight.
1205 */
1206 max = INT_GET(hdr2->firstused, ARCH_CONVERT)
1207 - sizeof(xfs_attr_leaf_hdr_t);
1208 max -= INT_GET(hdr2->count, ARCH_CONVERT)
1209 * sizeof(xfs_attr_leaf_entry_t);
1210 if (space > max) {
1211 xfs_attr_leaf_compact(args->trans, blk2->bp);
1212 }
1213
1214 /*
1215 * Move high entries from leaf1 to low end of leaf2.
1216 */
1217 xfs_attr_leaf_moveents(leaf1,
1218 INT_GET(hdr1->count, ARCH_CONVERT)-count,
1219 leaf2, 0, count, state->mp);
1220
1221 xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
1222 xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
1223 } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) {
1224 /*
1225 * I assert that since all callers pass in an empty
1226 * second buffer, this code should never execute.
1227 */
1228
1229 /*
1230 * Figure the total bytes to be added to the destination leaf.
1231 */
1232 /* number entries being moved */
1233 count -= INT_GET(hdr1->count, ARCH_CONVERT);
1234 space = totallen - INT_GET(hdr1->usedbytes, ARCH_CONVERT);
1235 space += count * sizeof(xfs_attr_leaf_entry_t);
1236
1237 /*
1238 * leaf1 is the destination, compact it if it looks tight.
1239 */
1240 max = INT_GET(hdr1->firstused, ARCH_CONVERT)
1241 - sizeof(xfs_attr_leaf_hdr_t);
1242 max -= INT_GET(hdr1->count, ARCH_CONVERT)
1243 * sizeof(xfs_attr_leaf_entry_t);
1244 if (space > max) {
1245 xfs_attr_leaf_compact(args->trans, blk1->bp);
1246 }
1247
1248 /*
1249 * Move low entries from leaf2 to high end of leaf1.
1250 */
1251 xfs_attr_leaf_moveents(leaf2, 0, leaf1,
1252 (int)INT_GET(hdr1->count, ARCH_CONVERT), count,
1253 state->mp);
1254
1255 xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
1256 xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
1257 }
1258
1259 /*
1260 * Copy out last hashval in each block for B-tree code.
1261 */
1262 blk1->hashval =
1263 INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count,
1264 ARCH_CONVERT)-1].hashval, ARCH_CONVERT);
1265 blk2->hashval =
1266 INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count,
1267 ARCH_CONVERT)-1].hashval, ARCH_CONVERT);
1268
1269 /*
1270 * Adjust the expected index for insertion.
1271 * NOTE: this code depends on the (current) situation that the
1272 * second block was originally empty.
1273 *
1274 * If the insertion point moved to the 2nd block, we must adjust
1275 * the index. We must also track the entry just following the
1276 * new entry for use in an "atomic rename" operation, that entry
1277 * is always the "old" entry and the "new" entry is what we are
1278 * inserting. The index/blkno fields refer to the "old" entry,
1279 * while the index2/blkno2 fields refer to the "new" entry.
1280 */
1281 if (blk1->index > INT_GET(leaf1->hdr.count, ARCH_CONVERT)) {
1282 ASSERT(state->inleaf == 0);
1283 blk2->index = blk1->index
1284 - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
1285 args->index = args->index2 = blk2->index;
1286 args->blkno = args->blkno2 = blk2->blkno;
1287 } else if (blk1->index == INT_GET(leaf1->hdr.count, ARCH_CONVERT)) {
1288 if (state->inleaf) {
1289 args->index = blk1->index;
1290 args->blkno = blk1->blkno;
1291 args->index2 = 0;
1292 args->blkno2 = blk2->blkno;
1293 } else {
1294 blk2->index = blk1->index
1295 - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
1296 args->index = args->index2 = blk2->index;
1297 args->blkno = args->blkno2 = blk2->blkno;
1298 }
1299 } else {
1300 ASSERT(state->inleaf == 1);
1301 args->index = args->index2 = blk1->index;
1302 args->blkno = args->blkno2 = blk1->blkno;
1303 }
1304 }
1305
1306 /*
1307 * Examine entries until we reduce the absolute difference in
1308 * byte usage between the two blocks to a minimum.
1309 * GROT: Is this really necessary? With other than a 512 byte blocksize,
1310 * GROT: there will always be enough room in either block for a new entry.
1311 * GROT: Do a double-split for this case?
1312 */
1313 STATIC int
1314 xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
1315 xfs_da_state_blk_t *blk1,
1316 xfs_da_state_blk_t *blk2,
1317 int *countarg, int *usedbytesarg)
1318 {
1319 xfs_attr_leafblock_t *leaf1, *leaf2;
1320 xfs_attr_leaf_hdr_t *hdr1, *hdr2;
1321 xfs_attr_leaf_entry_t *entry;
1322 int count, max, index, totallen, half;
1323 int lastdelta, foundit, tmp;
1324
1325 /*
1326 * Set up environment.
1327 */
1328 leaf1 = blk1->bp->data;
1329 leaf2 = blk2->bp->data;
1330 hdr1 = &leaf1->hdr;
1331 hdr2 = &leaf2->hdr;
1332 foundit = 0;
1333 totallen = 0;
1334
1335 /*
1336 * Examine entries until we reduce the absolute difference in
1337 * byte usage between the two blocks to a minimum.
1338 */
1339 max = INT_GET(hdr1->count, ARCH_CONVERT)
1340 + INT_GET(hdr2->count, ARCH_CONVERT);
1341 half = (max+1) * sizeof(*entry);
1342 half += INT_GET(hdr1->usedbytes, ARCH_CONVERT)
1343 + INT_GET(hdr2->usedbytes, ARCH_CONVERT)
1344 + xfs_attr_leaf_newentsize(state->args,
1345 state->blocksize, NULL);
1346 half /= 2;
1347 lastdelta = state->blocksize;
1348 entry = &leaf1->entries[0];
1349 for (count = index = 0; count < max; entry++, index++, count++) {
1350
1351 #define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A))
1352 /*
1353 * The new entry is in the first block, account for it.
1354 */
1355 if (count == blk1->index) {
1356 tmp = totallen + sizeof(*entry) +
1357 xfs_attr_leaf_newentsize(state->args,
1358 state->blocksize,
1359 NULL);
1360 if (XFS_ATTR_ABS(half - tmp) > lastdelta)
1361 break;
1362 lastdelta = XFS_ATTR_ABS(half - tmp);
1363 totallen = tmp;
1364 foundit = 1;
1365 }
1366
1367 /*
1368 * Wrap around into the second block if necessary.
1369 */
1370 if (count == INT_GET(hdr1->count, ARCH_CONVERT)) {
1371 leaf1 = leaf2;
1372 entry = &leaf1->entries[0];
1373 index = 0;
1374 }
1375
1376 /*
1377 * Figure out if next leaf entry would be too much.
1378 */
1379 tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1,
1380 index);
1381 if (XFS_ATTR_ABS(half - tmp) > lastdelta)
1382 break;
1383 lastdelta = XFS_ATTR_ABS(half - tmp);
1384 totallen = tmp;
1385 #undef XFS_ATTR_ABS
1386 }
1387
1388 /*
1389 * Calculate the number of usedbytes that will end up in lower block.
1390 * If new entry not in lower block, fix up the count.
1391 */
1392 totallen -= count * sizeof(*entry);
1393 if (foundit) {
1394 totallen -= sizeof(*entry) +
1395 xfs_attr_leaf_newentsize(state->args,
1396 state->blocksize,
1397 NULL);
1398 }
1399
1400 *countarg = count;
1401 *usedbytesarg = totallen;
1402 return(foundit);
1403 }
1404
1405 /*========================================================================
1406 * Routines used for shrinking the Btree.
1407 *========================================================================*/
1408
1409 /*
1410 * Check a leaf block and its neighbors to see if the block should be
1411 * collapsed into one or the other neighbor. Always keep the block
1412 * with the smaller block number.
1413 * If the current block is over 50% full, don't try to join it, return 0.
1414 * If the block is empty, fill in the state structure and return 2.
1415 * If it can be collapsed, fill in the state structure and return 1.
1416 * If nothing can be done, return 0.
1417 *
1418 * GROT: allow for INCOMPLETE entries in calculation.
1419 */
1420 int
1421 xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
1422 {
1423 xfs_attr_leafblock_t *leaf;
1424 xfs_da_state_blk_t *blk;
1425 xfs_da_blkinfo_t *info;
1426 int count, bytes, forward, error, retval, i;
1427 xfs_dablk_t blkno;
1428 xfs_dabuf_t *bp;
1429
1430 /*
1431 * Check for the degenerate case of the block being over 50% full.
1432 * If so, it's not worth even looking to see if we might be able
1433 * to coalesce with a sibling.
1434 */
1435 blk = &state->path.blk[ state->path.active-1 ];
1436 info = blk->bp->data;
1437 ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC);
1438 leaf = (xfs_attr_leafblock_t *)info;
1439 count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1440 bytes = sizeof(xfs_attr_leaf_hdr_t) +
1441 count * sizeof(xfs_attr_leaf_entry_t) +
1442 INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1443 if (bytes > (state->blocksize >> 1)) {
1444 *action = 0; /* blk over 50%, don't try to join */
1445 return(0);
1446 }
1447
1448 /*
1449 * Check for the degenerate case of the block being empty.
1450 * If the block is empty, we'll simply delete it, no need to
1451 * coalesce it with a sibling block. We choose (aribtrarily)
1452 * to merge with the forward block unless it is NULL.
1453 */
1454 if (count == 0) {
1455 /*
1456 * Make altpath point to the block we want to keep and
1457 * path point to the block we want to drop (this one).
1458 */
1459 forward = info->forw;
1460 memcpy(&state->altpath, &state->path, sizeof(state->path));
1461 error = xfs_da_path_shift(state, &state->altpath, forward,
1462 0, &retval);
1463 if (error)
1464 return(error);
1465 if (retval) {
1466 *action = 0;
1467 } else {
1468 *action = 2;
1469 }
1470 return(0);
1471 }
1472
1473 /*
1474 * Examine each sibling block to see if we can coalesce with
1475 * at least 25% free space to spare. We need to figure out
1476 * whether to merge with the forward or the backward block.
1477 * We prefer coalescing with the lower numbered sibling so as
1478 * to shrink an attribute list over time.
1479 */
1480 /* start with smaller blk num */
1481 forward = (INT_GET(info->forw, ARCH_CONVERT)
1482 < INT_GET(info->back, ARCH_CONVERT));
1483 for (i = 0; i < 2; forward = !forward, i++) {
1484 if (forward)
1485 blkno = INT_GET(info->forw, ARCH_CONVERT);
1486 else
1487 blkno = INT_GET(info->back, ARCH_CONVERT);
1488 if (blkno == 0)
1489 continue;
1490 error = xfs_da_read_buf(state->args->trans, state->args->dp,
1491 blkno, -1, &bp, XFS_ATTR_FORK);
1492 if (error)
1493 return(error);
1494 ASSERT(bp != NULL);
1495
1496 leaf = (xfs_attr_leafblock_t *)info;
1497 count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1498 bytes = state->blocksize - (state->blocksize>>2);
1499 bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1500 leaf = bp->data;
1501 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1502 == XFS_ATTR_LEAF_MAGIC);
1503 count += INT_GET(leaf->hdr.count, ARCH_CONVERT);
1504 bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1505 bytes -= count * sizeof(xfs_attr_leaf_entry_t);
1506 bytes -= sizeof(xfs_attr_leaf_hdr_t);
1507 xfs_da_brelse(state->args->trans, bp);
1508 if (bytes >= 0)
1509 break; /* fits with at least 25% to spare */
1510 }
1511 if (i >= 2) {
1512 *action = 0;
1513 return(0);
1514 }
1515
1516 /*
1517 * Make altpath point to the block we want to keep (the lower
1518 * numbered block) and path point to the block we want to drop.
1519 */
1520 memcpy(&state->altpath, &state->path, sizeof(state->path));
1521 if (blkno < blk->blkno) {
1522 error = xfs_da_path_shift(state, &state->altpath, forward,
1523 0, &retval);
1524 } else {
1525 error = xfs_da_path_shift(state, &state->path, forward,
1526 0, &retval);
1527 }
1528 if (error)
1529 return(error);
1530 if (retval) {
1531 *action = 0;
1532 } else {
1533 *action = 1;
1534 }
1535 return(0);
1536 }
1537
1538 /*
1539 * Remove a name from the leaf attribute list structure.
1540 *
1541 * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
1542 * If two leaves are 37% full, when combined they will leave 25% free.
1543 */
1544 int
1545 xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args)
1546 {
1547 xfs_attr_leafblock_t *leaf;
1548 xfs_attr_leaf_hdr_t *hdr;
1549 xfs_attr_leaf_map_t *map;
1550 xfs_attr_leaf_entry_t *entry;
1551 int before, after, smallest, entsize;
1552 int tablesize, tmp, i;
1553 xfs_mount_t *mp;
1554
1555 leaf = bp->data;
1556 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1557 == XFS_ATTR_LEAF_MAGIC);
1558 hdr = &leaf->hdr;
1559 mp = args->trans->t_mountp;
1560 ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0)
1561 && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
1562 ASSERT((args->index >= 0)
1563 && (args->index < INT_GET(hdr->count, ARCH_CONVERT)));
1564 ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT)
1565 >= ((INT_GET(hdr->count, ARCH_CONVERT)
1566 * sizeof(*entry))+sizeof(*hdr)));
1567 entry = &leaf->entries[args->index];
1568 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
1569 >= INT_GET(hdr->firstused, ARCH_CONVERT));
1570 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
1571
1572 /*
1573 * Scan through free region table:
1574 * check for adjacency of free'd entry with an existing one,
1575 * find smallest free region in case we need to replace it,
1576 * adjust any map that borders the entry table,
1577 */
1578 tablesize = INT_GET(hdr->count, ARCH_CONVERT)
1579 * sizeof(xfs_attr_leaf_entry_t)
1580 + sizeof(xfs_attr_leaf_hdr_t);
1581 map = &hdr->freemap[0];
1582 tmp = INT_GET(map->size, ARCH_CONVERT);
1583 before = after = -1;
1584 smallest = XFS_ATTR_LEAF_MAPSIZE - 1;
1585 entsize = xfs_attr_leaf_entsize(leaf, args->index);
1586 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
1587 ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
1588 ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
1589 if (INT_GET(map->base, ARCH_CONVERT) == tablesize) {
1590 INT_MOD(map->base, ARCH_CONVERT,
1591 -sizeof(xfs_attr_leaf_entry_t));
1592 INT_MOD(map->size, ARCH_CONVERT,
1593 sizeof(xfs_attr_leaf_entry_t));
1594 }
1595
1596 if ((INT_GET(map->base, ARCH_CONVERT)
1597 + INT_GET(map->size, ARCH_CONVERT))
1598 == INT_GET(entry->nameidx, ARCH_CONVERT)) {
1599 before = i;
1600 } else if (INT_GET(map->base, ARCH_CONVERT)
1601 == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) {
1602 after = i;
1603 } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) {
1604 tmp = INT_GET(map->size, ARCH_CONVERT);
1605 smallest = i;
1606 }
1607 }
1608
1609 /*
1610 * Coalesce adjacent freemap regions,
1611 * or replace the smallest region.
1612 */
1613 if ((before >= 0) || (after >= 0)) {
1614 if ((before >= 0) && (after >= 0)) {
1615 map = &hdr->freemap[before];
1616 INT_MOD(map->size, ARCH_CONVERT, entsize);
1617 INT_MOD(map->size, ARCH_CONVERT,
1618 INT_GET(hdr->freemap[after].size,
1619 ARCH_CONVERT));
1620 hdr->freemap[after].base = 0;
1621 hdr->freemap[after].size = 0;
1622 } else if (before >= 0) {
1623 map = &hdr->freemap[before];
1624 INT_MOD(map->size, ARCH_CONVERT, entsize);
1625 } else {
1626 map = &hdr->freemap[after];
1627 /* both on-disk, don't endian flip twice */
1628 map->base = entry->nameidx;
1629 INT_MOD(map->size, ARCH_CONVERT, entsize);
1630 }
1631 } else {
1632 /*
1633 * Replace smallest region (if it is smaller than free'd entry)
1634 */
1635 map = &hdr->freemap[smallest];
1636 if (INT_GET(map->size, ARCH_CONVERT) < entsize) {
1637 INT_SET(map->base, ARCH_CONVERT,
1638 INT_GET(entry->nameidx, ARCH_CONVERT));
1639 INT_SET(map->size, ARCH_CONVERT, entsize);
1640 }
1641 }
1642
1643 /*
1644 * Did we remove the first entry?
1645 */
1646 if (INT_GET(entry->nameidx, ARCH_CONVERT)
1647 == INT_GET(hdr->firstused, ARCH_CONVERT))
1648 smallest = 1;
1649 else
1650 smallest = 0;
1651
1652 /*
1653 * Compress the remaining entries and zero out the removed stuff.
1654 */
1655 memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize);
1656 INT_MOD(hdr->usedbytes, ARCH_CONVERT, -entsize);
1657 xfs_da_log_buf(args->trans, bp,
1658 XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
1659 entsize));
1660
1661 tmp = (INT_GET(hdr->count, ARCH_CONVERT) - args->index)
1662 * sizeof(xfs_attr_leaf_entry_t);
1663 memmove((char *)entry, (char *)(entry+1), tmp);
1664 INT_MOD(hdr->count, ARCH_CONVERT, -1);
1665 xfs_da_log_buf(args->trans, bp,
1666 XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
1667 entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)];
1668 memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t));
1669
1670 /*
1671 * If we removed the first entry, re-find the first used byte
1672 * in the name area. Note that if the entry was the "firstused",
1673 * then we don't have a "hole" in our block resulting from
1674 * removing the name.
1675 */
1676 if (smallest) {
1677 tmp = XFS_LBSIZE(mp);
1678 entry = &leaf->entries[0];
1679 for (i = INT_GET(hdr->count, ARCH_CONVERT)-1;
1680 i >= 0; entry++, i--) {
1681 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
1682 >= INT_GET(hdr->firstused, ARCH_CONVERT));
1683 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
1684 < XFS_LBSIZE(mp));
1685 if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp)
1686 tmp = INT_GET(entry->nameidx, ARCH_CONVERT);
1687 }
1688 INT_SET(hdr->firstused, ARCH_CONVERT, tmp);
1689 if (!hdr->firstused) {
1690 INT_SET(hdr->firstused, ARCH_CONVERT,
1691 tmp - XFS_ATTR_LEAF_NAME_ALIGN);
1692 }
1693 } else {
1694 hdr->holes = 1; /* mark as needing compaction */
1695 }
1696 xfs_da_log_buf(args->trans, bp,
1697 XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1698
1699 /*
1700 * Check if leaf is less than 50% full, caller may want to
1701 * "join" the leaf with a sibling if so.
1702 */
1703 tmp = sizeof(xfs_attr_leaf_hdr_t);
1704 tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT)
1705 * sizeof(xfs_attr_leaf_entry_t);
1706 tmp += INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
1707 return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */
1708 }
1709
1710 /*
1711 * Move all the attribute list entries from drop_leaf into save_leaf.
1712 */
1713 void
1714 xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
1715 xfs_da_state_blk_t *save_blk)
1716 {
1717 xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
1718 xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
1719 xfs_mount_t *mp;
1720 char *tmpbuffer;
1721
1722 /*
1723 * Set up environment.
1724 */
1725 mp = state->mp;
1726 ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC);
1727 ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC);
1728 drop_leaf = drop_blk->bp->data;
1729 save_leaf = save_blk->bp->data;
1730 ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT)
1731 == XFS_ATTR_LEAF_MAGIC);
1732 ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT)
1733 == XFS_ATTR_LEAF_MAGIC);
1734 drop_hdr = &drop_leaf->hdr;
1735 save_hdr = &save_leaf->hdr;
1736
1737 /*
1738 * Save last hashval from dying block for later Btree fixup.
1739 */
1740 drop_blk->hashval =
1741 INT_GET(drop_leaf->entries[INT_GET(drop_leaf->hdr.count,
1742 ARCH_CONVERT)-1].hashval,
1743 ARCH_CONVERT);
1744
1745 /*
1746 * Check if we need a temp buffer, or can we do it in place.
1747 * Note that we don't check "leaf" for holes because we will
1748 * always be dropping it, toosmall() decided that for us already.
1749 */
1750 if (save_hdr->holes == 0) {
1751 /*
1752 * dest leaf has no holes, so we add there. May need
1753 * to make some room in the entry array.
1754 */
1755 if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
1756 xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0,
1757 (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
1758 } else {
1759 xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf,
1760 INT_GET(save_hdr->count, ARCH_CONVERT),
1761 (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
1762 mp);
1763 }
1764 } else {
1765 /*
1766 * Destination has holes, so we make a temporary copy
1767 * of the leaf and add them both to that.
1768 */
1769 tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
1770 ASSERT(tmpbuffer != NULL);
1771 memset(tmpbuffer, 0, state->blocksize);
1772 tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer;
1773 tmp_hdr = &tmp_leaf->hdr;
1774 tmp_hdr->info = save_hdr->info; /* struct copy */
1775 tmp_hdr->count = 0;
1776 INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize);
1777 if (!tmp_hdr->firstused) {
1778 INT_SET(tmp_hdr->firstused, ARCH_CONVERT,
1779 state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN);
1780 }
1781 tmp_hdr->usedbytes = 0;
1782 if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
1783 xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
1784 (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
1785 mp);
1786 xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf,
1787 INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
1788 (int)INT_GET(save_hdr->count, ARCH_CONVERT),
1789 mp);
1790 } else {
1791 xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
1792 (int)INT_GET(save_hdr->count, ARCH_CONVERT),
1793 mp);
1794 xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf,
1795 INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
1796 (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
1797 mp);
1798 }
1799 memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize);
1800 kmem_free(tmpbuffer, state->blocksize);
1801 }
1802
1803 xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
1804 state->blocksize - 1);
1805
1806 /*
1807 * Copy out last hashval in each block for B-tree code.
1808 */
1809 save_blk->hashval =
1810 INT_GET(save_leaf->entries[INT_GET(save_leaf->hdr.count,
1811 ARCH_CONVERT)-1].hashval,
1812 ARCH_CONVERT);
1813 }
1814
1815 /*========================================================================
1816 * Routines used for finding things in the Btree.
1817 *========================================================================*/
1818
1819 /*
1820 * Look up a name in a leaf attribute list structure.
1821 * This is the internal routine, it uses the caller's buffer.
1822 *
1823 * Note that duplicate keys are allowed, but only check within the
1824 * current leaf node. The Btree code must check in adjacent leaf nodes.
1825 *
1826 * Return in args->index the index into the entry[] array of either
1827 * the found entry, or where the entry should have been (insert before
1828 * that entry).
1829 *
1830 * Don't change the args->value unless we find the attribute.
1831 */
1832 int
1833 xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args)
1834 {
1835 xfs_attr_leafblock_t *leaf;
1836 xfs_attr_leaf_entry_t *entry;
1837 xfs_attr_leaf_name_local_t *name_loc;
1838 xfs_attr_leaf_name_remote_t *name_rmt;
1839 int probe, span;
1840 xfs_dahash_t hashval;
1841
1842 leaf = bp->data;
1843 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1844 == XFS_ATTR_LEAF_MAGIC);
1845 ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT)
1846 < (XFS_LBSIZE(args->dp->i_mount)/8));
1847
1848 /*
1849 * Binary search. (note: small blocks will skip this loop)
1850 */
1851 hashval = args->hashval;
1852 probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2;
1853 for (entry = &leaf->entries[probe]; span > 4;
1854 entry = &leaf->entries[probe]) {
1855 span /= 2;
1856 if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)
1857 probe += span;
1858 else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval)
1859 probe -= span;
1860 else
1861 break;
1862 }
1863 ASSERT((probe >= 0) &&
1864 (!leaf->hdr.count
1865 || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))));
1866 ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT)
1867 == hashval));
1868
1869 /*
1870 * Since we may have duplicate hashval's, find the first matching
1871 * hashval in the leaf.
1872 */
1873 while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT)
1874 >= hashval)) {
1875 entry--;
1876 probe--;
1877 }
1878 while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))
1879 && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) {
1880 entry++;
1881 probe++;
1882 }
1883 if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT))
1884 || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) {
1885 args->index = probe;
1886 return(XFS_ERROR(ENOATTR));
1887 }
1888
1889 /*
1890 * Duplicate keys may be present, so search all of them for a match.
1891 */
1892 for ( ; (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))
1893 && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval);
1894 entry++, probe++) {
1895 /*
1896 * GROT: Add code to remove incomplete entries.
1897 */
1898 /*
1899 * If we are looking for INCOMPLETE entries, show only those.
1900 * If we are looking for complete entries, show only those.
1901 */
1902 if ((args->flags & XFS_ATTR_INCOMPLETE) !=
1903 (entry->flags & XFS_ATTR_INCOMPLETE)) {
1904 continue;
1905 }
1906 if (entry->flags & XFS_ATTR_LOCAL) {
1907 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe);
1908 if (name_loc->namelen != args->namelen)
1909 continue;
1910 if (memcmp(args->name, (char *)name_loc->nameval,
1911 args->namelen) != 0)
1912 continue;
1913 if (((args->flags & ATTR_SECURE) != 0) !=
1914 ((entry->flags & XFS_ATTR_SECURE) != 0))
1915 continue;
1916 if (((args->flags & ATTR_ROOT) != 0) !=
1917 ((entry->flags & XFS_ATTR_ROOT) != 0))
1918 continue;
1919 args->index = probe;
1920 return(XFS_ERROR(EEXIST));
1921 } else {
1922 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe);
1923 if (name_rmt->namelen != args->namelen)
1924 continue;
1925 if (memcmp(args->name, (char *)name_rmt->name,
1926 args->namelen) != 0)
1927 continue;
1928 if (((args->flags & ATTR_SECURE) != 0) !=
1929 ((entry->flags & XFS_ATTR_SECURE) != 0))
1930 continue;
1931 if (((args->flags & ATTR_ROOT) != 0) !=
1932 ((entry->flags & XFS_ATTR_ROOT) != 0))
1933 continue;
1934 args->index = probe;
1935 args->rmtblkno
1936 = INT_GET(name_rmt->valueblk, ARCH_CONVERT);
1937 args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount,
1938 INT_GET(name_rmt->valuelen,
1939 ARCH_CONVERT));
1940 return(XFS_ERROR(EEXIST));
1941 }
1942 }
1943 args->index = probe;
1944 return(XFS_ERROR(ENOATTR));
1945 }
1946
1947 /*
1948 * Get the value associated with an attribute name from a leaf attribute
1949 * list structure.
1950 */
1951 int
1952 xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args)
1953 {
1954 int valuelen;
1955 xfs_attr_leafblock_t *leaf;
1956 xfs_attr_leaf_entry_t *entry;
1957 xfs_attr_leaf_name_local_t *name_loc;
1958 xfs_attr_leaf_name_remote_t *name_rmt;
1959
1960 leaf = bp->data;
1961 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
1962 == XFS_ATTR_LEAF_MAGIC);
1963 ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT)
1964 < (XFS_LBSIZE(args->dp->i_mount)/8));
1965 ASSERT(args->index < ((int)INT_GET(leaf->hdr.count, ARCH_CONVERT)));
1966
1967 entry = &leaf->entries[args->index];
1968 if (entry->flags & XFS_ATTR_LOCAL) {
1969 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
1970 ASSERT(name_loc->namelen == args->namelen);
1971 ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0);
1972 valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT);
1973 if (args->flags & ATTR_KERNOVAL) {
1974 args->valuelen = valuelen;
1975 return(0);
1976 }
1977 if (args->valuelen < valuelen) {
1978 args->valuelen = valuelen;
1979 return(XFS_ERROR(ERANGE));
1980 }
1981 args->valuelen = valuelen;
1982 memcpy(args->value, &name_loc->nameval[args->namelen], valuelen);
1983 } else {
1984 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
1985 ASSERT(name_rmt->namelen == args->namelen);
1986 ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0);
1987 valuelen = INT_GET(name_rmt->valuelen, ARCH_CONVERT);
1988 args->rmtblkno = INT_GET(name_rmt->valueblk, ARCH_CONVERT);
1989 args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen);
1990 if (args->flags & ATTR_KERNOVAL) {
1991 args->valuelen = valuelen;
1992 return(0);
1993 }
1994 if (args->valuelen < valuelen) {
1995 args->valuelen = valuelen;
1996 return(XFS_ERROR(ERANGE));
1997 }
1998 args->valuelen = valuelen;
1999 }
2000 return(0);
2001 }
2002
2003 /*========================================================================
2004 * Utility routines.
2005 *========================================================================*/
2006
2007 /*
2008 * Move the indicated entries from one leaf to another.
2009 * NOTE: this routine modifies both source and destination leaves.
2010 */
2011 /*ARGSUSED*/
2012 STATIC void
2013 xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s,
2014 xfs_attr_leafblock_t *leaf_d, int start_d,
2015 int count, xfs_mount_t *mp)
2016 {
2017 xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
2018 xfs_attr_leaf_entry_t *entry_s, *entry_d;
2019 int desti, tmp, i;
2020
2021 /*
2022 * Check for nothing to do.
2023 */
2024 if (count == 0)
2025 return;
2026
2027 /*
2028 * Set up environment.
2029 */
2030 ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT)
2031 == XFS_ATTR_LEAF_MAGIC);
2032 ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT)
2033 == XFS_ATTR_LEAF_MAGIC);
2034 hdr_s = &leaf_s->hdr;
2035 hdr_d = &leaf_d->hdr;
2036 ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0)
2037 && (INT_GET(hdr_s->count, ARCH_CONVERT)
2038 < (XFS_LBSIZE(mp)/8)));
2039 ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >=
2040 ((INT_GET(hdr_s->count, ARCH_CONVERT)
2041 * sizeof(*entry_s))+sizeof(*hdr_s)));
2042 ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8));
2043 ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >=
2044 ((INT_GET(hdr_d->count, ARCH_CONVERT)
2045 * sizeof(*entry_d))+sizeof(*hdr_d)));
2046
2047 ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT));
2048 ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT));
2049 ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT));
2050
2051 /*
2052 * Move the entries in the destination leaf up to make a hole?
2053 */
2054 if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) {
2055 tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d;
2056 tmp *= sizeof(xfs_attr_leaf_entry_t);
2057 entry_s = &leaf_d->entries[start_d];
2058 entry_d = &leaf_d->entries[start_d + count];
2059 memmove((char *)entry_d, (char *)entry_s, tmp);
2060 }
2061
2062 /*
2063 * Copy all entry's in the same (sorted) order,
2064 * but allocate attribute info packed and in sequence.
2065 */
2066 entry_s = &leaf_s->entries[start_s];
2067 entry_d = &leaf_d->entries[start_d];
2068 desti = start_d;
2069 for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) {
2070 ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT)
2071 >= INT_GET(hdr_s->firstused, ARCH_CONVERT));
2072 tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i);
2073 #ifdef GROT
2074 /*
2075 * Code to drop INCOMPLETE entries. Difficult to use as we
2076 * may also need to change the insertion index. Code turned
2077 * off for 6.2, should be revisited later.
2078 */
2079 if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */
2080 memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
2081 INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp);
2082 INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
2083 entry_d--; /* to compensate for ++ in loop hdr */
2084 desti--;
2085 if ((start_s + i) < offset)
2086 result++; /* insertion index adjustment */
2087 } else {
2088 #endif /* GROT */
2089 INT_MOD(hdr_d->firstused, ARCH_CONVERT, -tmp);
2090 /* both on-disk, don't endian flip twice */
2091 entry_d->hashval = entry_s->hashval;
2092 /* both on-disk, don't endian flip twice */
2093 entry_d->nameidx = hdr_d->firstused;
2094 entry_d->flags = entry_s->flags;
2095 ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp
2096 <= XFS_LBSIZE(mp));
2097 memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti),
2098 XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp);
2099 ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp
2100 <= XFS_LBSIZE(mp));
2101 memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
2102 INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp);
2103 INT_MOD(hdr_d->usedbytes, ARCH_CONVERT, tmp);
2104 INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
2105 INT_MOD(hdr_d->count, ARCH_CONVERT, 1);
2106 tmp = INT_GET(hdr_d->count, ARCH_CONVERT)
2107 * sizeof(xfs_attr_leaf_entry_t)
2108 + sizeof(xfs_attr_leaf_hdr_t);
2109 ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp);
2110 #ifdef GROT
2111 }
2112 #endif /* GROT */
2113 }
2114
2115 /*
2116 * Zero out the entries we just copied.
2117 */
2118 if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) {
2119 tmp = count * sizeof(xfs_attr_leaf_entry_t);
2120 entry_s = &leaf_s->entries[start_s];
2121 ASSERT(((char *)entry_s + tmp) <=
2122 ((char *)leaf_s + XFS_LBSIZE(mp)));
2123 memset((char *)entry_s, 0, tmp);
2124 } else {
2125 /*
2126 * Move the remaining entries down to fill the hole,
2127 * then zero the entries at the top.
2128 */
2129 tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count;
2130 tmp *= sizeof(xfs_attr_leaf_entry_t);
2131 entry_s = &leaf_s->entries[start_s + count];
2132 entry_d = &leaf_s->entries[start_s];
2133 memmove((char *)entry_d, (char *)entry_s, tmp);
2134
2135 tmp = count * sizeof(xfs_attr_leaf_entry_t);
2136 entry_s = &leaf_s->entries[INT_GET(hdr_s->count,
2137 ARCH_CONVERT)];
2138 ASSERT(((char *)entry_s + tmp) <=
2139 ((char *)leaf_s + XFS_LBSIZE(mp)));
2140 memset((char *)entry_s, 0, tmp);
2141 }
2142
2143 /*
2144 * Fill in the freemap information
2145 */
2146 INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT,
2147 sizeof(xfs_attr_leaf_hdr_t));
2148 INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT,
2149 INT_GET(hdr_d->count, ARCH_CONVERT)
2150 * sizeof(xfs_attr_leaf_entry_t));
2151 INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT,
2152 INT_GET(hdr_d->firstused, ARCH_CONVERT)
2153 - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
2154 hdr_d->freemap[1].base = 0;
2155 hdr_d->freemap[2].base = 0;
2156 hdr_d->freemap[1].size = 0;
2157 hdr_d->freemap[2].size = 0;
2158 hdr_s->holes = 1; /* leaf may not be compact */
2159 }
2160
2161 /*
2162 * Compare two leaf blocks "order".
2163 * Return 0 unless leaf2 should go before leaf1.
2164 */
2165 int
2166 xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
2167 {
2168 xfs_attr_leafblock_t *leaf1, *leaf2;
2169
2170 leaf1 = leaf1_bp->data;
2171 leaf2 = leaf2_bp->data;
2172 ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
2173 == XFS_ATTR_LEAF_MAGIC) &&
2174 (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
2175 == XFS_ATTR_LEAF_MAGIC));
2176 if ( (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0)
2177 && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0)
2178 && ( (INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) <
2179 INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT))
2180 || (INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count,
2181 ARCH_CONVERT)-1].hashval, ARCH_CONVERT) <
2182 INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count,
2183 ARCH_CONVERT)-1].hashval, ARCH_CONVERT))) ) {
2184 return(1);
2185 }
2186 return(0);
2187 }
2188
2189 /*
2190 * Pick up the last hashvalue from a leaf block.
2191 */
2192 xfs_dahash_t
2193 xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count)
2194 {
2195 xfs_attr_leafblock_t *leaf;
2196
2197 leaf = bp->data;
2198 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2199 == XFS_ATTR_LEAF_MAGIC);
2200 if (count)
2201 *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
2202 if (!leaf->hdr.count)
2203 return(0);
2204 return(INT_GET(leaf->entries[INT_GET(leaf->hdr.count,
2205 ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
2206 }
2207
2208 /*
2209 * Calculate the number of bytes used to store the indicated attribute
2210 * (whether local or remote only calculate bytes in this block).
2211 */
2212 int
2213 xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
2214 {
2215 xfs_attr_leaf_name_local_t *name_loc;
2216 xfs_attr_leaf_name_remote_t *name_rmt;
2217 int size;
2218
2219 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2220 == XFS_ATTR_LEAF_MAGIC);
2221 if (leaf->entries[index].flags & XFS_ATTR_LOCAL) {
2222 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index);
2223 size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen,
2224 INT_GET(name_loc->valuelen,
2225 ARCH_CONVERT));
2226 } else {
2227 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index);
2228 size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen);
2229 }
2230 return(size);
2231 }
2232
2233 /*
2234 * Calculate the number of bytes that would be required to store the new
2235 * attribute (whether local or remote only calculate bytes in this block).
2236 * This routine decides as a side effect whether the attribute will be
2237 * a "local" or a "remote" attribute.
2238 */
2239 int
2240 xfs_attr_leaf_newentsize(xfs_da_args_t *args, int blocksize, int *local)
2241 {
2242 int size;
2243
2244 size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(args->namelen, args->valuelen);
2245 if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) {
2246 if (local) {
2247 *local = 1;
2248 }
2249 } else {
2250 size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(args->namelen);
2251 if (local) {
2252 *local = 0;
2253 }
2254 }
2255 return(size);
2256 }
2257
2258 /*
2259 * Copy out attribute list entries for attr_list(), for leaf attribute lists.
2260 */
2261 int
2262 xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context)
2263 {
2264 attrlist_cursor_kern_t *cursor;
2265 xfs_attr_leafblock_t *leaf;
2266 xfs_attr_leaf_entry_t *entry;
2267 xfs_attr_leaf_name_local_t *name_loc;
2268 xfs_attr_leaf_name_remote_t *name_rmt;
2269 int retval, i;
2270
2271 ASSERT(bp != NULL);
2272 leaf = bp->data;
2273 cursor = context->cursor;
2274 cursor->initted = 1;
2275
2276 xfs_attr_trace_l_cl("blk start", context, leaf);
2277
2278 /*
2279 * Re-find our place in the leaf block if this is a new syscall.
2280 */
2281 if (context->resynch) {
2282 entry = &leaf->entries[0];
2283 for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
2284 entry++, i++) {
2285 if (INT_GET(entry->hashval, ARCH_CONVERT)
2286 == cursor->hashval) {
2287 if (cursor->offset == context->dupcnt) {
2288 context->dupcnt = 0;
2289 break;
2290 }
2291 context->dupcnt++;
2292 } else if (INT_GET(entry->hashval, ARCH_CONVERT)
2293 > cursor->hashval) {
2294 context->dupcnt = 0;
2295 break;
2296 }
2297 }
2298 if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) {
2299 xfs_attr_trace_l_c("not found", context);
2300 return(0);
2301 }
2302 } else {
2303 entry = &leaf->entries[0];
2304 i = 0;
2305 }
2306 context->resynch = 0;
2307
2308 /*
2309 * We have found our place, start copying out the new attributes.
2310 */
2311 retval = 0;
2312 for ( ; (i < INT_GET(leaf->hdr.count, ARCH_CONVERT))
2313 && (retval == 0); entry++, i++) {
2314 attrnames_t *namesp;
2315
2316 if (INT_GET(entry->hashval, ARCH_CONVERT) != cursor->hashval) {
2317 cursor->hashval = INT_GET(entry->hashval, ARCH_CONVERT);
2318 cursor->offset = 0;
2319 }
2320
2321 if (entry->flags & XFS_ATTR_INCOMPLETE)
2322 continue; /* skip incomplete entries */
2323 if (((context->flags & ATTR_SECURE) != 0) !=
2324 ((entry->flags & XFS_ATTR_SECURE) != 0) &&
2325 !(context->flags & ATTR_KERNORMALS))
2326 continue; /* skip non-matching entries */
2327 if (((context->flags & ATTR_ROOT) != 0) !=
2328 ((entry->flags & XFS_ATTR_ROOT) != 0) &&
2329 !(context->flags & ATTR_KERNROOTLS))
2330 continue; /* skip non-matching entries */
2331
2332 namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure :
2333 ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted :
2334 &attr_user);
2335
2336 if (entry->flags & XFS_ATTR_LOCAL) {
2337 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
2338 if (context->flags & ATTR_KERNOVAL) {
2339 ASSERT(context->flags & ATTR_KERNAMELS);
2340 context->count += namesp->attr_namelen +
2341 (int)name_loc->namelen + 1;
2342 } else {
2343 retval = xfs_attr_put_listent(context, namesp,
2344 (char *)name_loc->nameval,
2345 (int)name_loc->namelen,
2346 (int)INT_GET(name_loc->valuelen,
2347 ARCH_CONVERT));
2348 }
2349 } else {
2350 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2351 if (context->flags & ATTR_KERNOVAL) {
2352 ASSERT(context->flags & ATTR_KERNAMELS);
2353 context->count += namesp->attr_namelen +
2354 (int)name_rmt->namelen + 1;
2355 } else {
2356 retval = xfs_attr_put_listent(context, namesp,
2357 (char *)name_rmt->name,
2358 (int)name_rmt->namelen,
2359 (int)INT_GET(name_rmt->valuelen,
2360 ARCH_CONVERT));
2361 }
2362 }
2363 if (retval == 0) {
2364 cursor->offset++;
2365 }
2366 }
2367 xfs_attr_trace_l_cl("blk end", context, leaf);
2368 return(retval);
2369 }
2370
2371 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
2372 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
2373 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
2374 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
2375 & ~(sizeof(u_int32_t)-1))
2376
2377 /*
2378 * Format an attribute and copy it out to the user's buffer.
2379 * Take care to check values and protect against them changing later,
2380 * we may be reading them directly out of a user buffer.
2381 */
2382 /*ARGSUSED*/
2383 int
2384 xfs_attr_put_listent(xfs_attr_list_context_t *context,
2385 attrnames_t *namesp, char *name, int namelen, int valuelen)
2386 {
2387 attrlist_ent_t *aep;
2388 int arraytop;
2389
2390 ASSERT(!(context->flags & ATTR_KERNOVAL));
2391 if (context->flags & ATTR_KERNAMELS) {
2392 char *offset;
2393
2394 ASSERT(context->count >= 0);
2395
2396 arraytop = context->count + namesp->attr_namelen + namelen + 1;
2397 if (arraytop > context->firstu) {
2398 context->count = -1; /* insufficient space */
2399 return(1);
2400 }
2401 offset = (char *)context->alist + context->count;
2402 strncpy(offset, namesp->attr_name, namesp->attr_namelen);
2403 offset += namesp->attr_namelen;
2404 strncpy(offset, name, namelen); /* real name */
2405 offset += namelen;
2406 *offset = '\0';
2407 context->count += namesp->attr_namelen + namelen + 1;
2408 return(0);
2409 }
2410
2411 ASSERT(context->count >= 0);
2412 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
2413 ASSERT(context->firstu >= sizeof(*context->alist));
2414 ASSERT(context->firstu <= context->bufsize);
2415
2416 arraytop = sizeof(*context->alist) +
2417 context->count * sizeof(context->alist->al_offset[0]);
2418 context->firstu -= ATTR_ENTSIZE(namelen);
2419 if (context->firstu < arraytop) {
2420 xfs_attr_trace_l_c("buffer full", context);
2421 context->alist->al_more = 1;
2422 return(1);
2423 }
2424
2425 aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
2426 aep->a_valuelen = valuelen;
2427 memcpy(aep->a_name, name, namelen);
2428 aep->a_name[ namelen ] = 0;
2429 context->alist->al_offset[ context->count++ ] = context->firstu;
2430 context->alist->al_count = context->count;
2431 xfs_attr_trace_l_c("add", context);
2432 return(0);
2433 }
2434
2435 /*========================================================================
2436 * Manage the INCOMPLETE flag in a leaf entry
2437 *========================================================================*/
2438
2439 /*
2440 * Clear the INCOMPLETE flag on an entry in a leaf block.
2441 */
2442 int
2443 xfs_attr_leaf_clearflag(xfs_da_args_t *args)
2444 {
2445 xfs_attr_leafblock_t *leaf;
2446 xfs_attr_leaf_entry_t *entry;
2447 xfs_attr_leaf_name_remote_t *name_rmt;
2448 xfs_dabuf_t *bp;
2449 int error;
2450 #ifdef DEBUG
2451 xfs_attr_leaf_name_local_t *name_loc;
2452 int namelen;
2453 char *name;
2454 #endif /* DEBUG */
2455
2456 /*
2457 * Set up the operation.
2458 */
2459 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
2460 XFS_ATTR_FORK);
2461 if (error) {
2462 return(error);
2463 }
2464 ASSERT(bp != NULL);
2465
2466 leaf = bp->data;
2467 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2468 == XFS_ATTR_LEAF_MAGIC);
2469 ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT));
2470 ASSERT(args->index >= 0);
2471 entry = &leaf->entries[ args->index ];
2472 ASSERT(entry->flags & XFS_ATTR_INCOMPLETE);
2473
2474 #ifdef DEBUG
2475 if (entry->flags & XFS_ATTR_LOCAL) {
2476 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
2477 namelen = name_loc->namelen;
2478 name = (char *)name_loc->nameval;
2479 } else {
2480 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2481 namelen = name_rmt->namelen;
2482 name = (char *)name_rmt->name;
2483 }
2484 ASSERT(INT_GET(entry->hashval, ARCH_CONVERT) == args->hashval);
2485 ASSERT(namelen == args->namelen);
2486 ASSERT(memcmp(name, args->name, namelen) == 0);
2487 #endif /* DEBUG */
2488
2489 entry->flags &= ~XFS_ATTR_INCOMPLETE;
2490 xfs_da_log_buf(args->trans, bp,
2491 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
2492
2493 if (args->rmtblkno) {
2494 ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0);
2495 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2496 INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno);
2497 INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen);
2498 xfs_da_log_buf(args->trans, bp,
2499 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
2500 }
2501 xfs_da_buf_done(bp);
2502
2503 /*
2504 * Commit the flag value change and start the next trans in series.
2505 */
2506 error = xfs_attr_rolltrans(&args->trans, args->dp);
2507
2508 return(error);
2509 }
2510
2511 /*
2512 * Set the INCOMPLETE flag on an entry in a leaf block.
2513 */
2514 int
2515 xfs_attr_leaf_setflag(xfs_da_args_t *args)
2516 {
2517 xfs_attr_leafblock_t *leaf;
2518 xfs_attr_leaf_entry_t *entry;
2519 xfs_attr_leaf_name_remote_t *name_rmt;
2520 xfs_dabuf_t *bp;
2521 int error;
2522
2523 /*
2524 * Set up the operation.
2525 */
2526 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
2527 XFS_ATTR_FORK);
2528 if (error) {
2529 return(error);
2530 }
2531 ASSERT(bp != NULL);
2532
2533 leaf = bp->data;
2534 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2535 == XFS_ATTR_LEAF_MAGIC);
2536 ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT));
2537 ASSERT(args->index >= 0);
2538 entry = &leaf->entries[ args->index ];
2539
2540 ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0);
2541 entry->flags |= XFS_ATTR_INCOMPLETE;
2542 xfs_da_log_buf(args->trans, bp,
2543 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
2544 if ((entry->flags & XFS_ATTR_LOCAL) == 0) {
2545 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
2546 name_rmt->valueblk = 0;
2547 name_rmt->valuelen = 0;
2548 xfs_da_log_buf(args->trans, bp,
2549 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
2550 }
2551 xfs_da_buf_done(bp);
2552
2553 /*
2554 * Commit the flag value change and start the next trans in series.
2555 */
2556 error = xfs_attr_rolltrans(&args->trans, args->dp);
2557
2558 return(error);
2559 }
2560
2561 /*
2562 * In a single transaction, clear the INCOMPLETE flag on the leaf entry
2563 * given by args->blkno/index and set the INCOMPLETE flag on the leaf
2564 * entry given by args->blkno2/index2.
2565 *
2566 * Note that they could be in different blocks, or in the same block.
2567 */
2568 int
2569 xfs_attr_leaf_flipflags(xfs_da_args_t *args)
2570 {
2571 xfs_attr_leafblock_t *leaf1, *leaf2;
2572 xfs_attr_leaf_entry_t *entry1, *entry2;
2573 xfs_attr_leaf_name_remote_t *name_rmt;
2574 xfs_dabuf_t *bp1, *bp2;
2575 int error;
2576 #ifdef DEBUG
2577 xfs_attr_leaf_name_local_t *name_loc;
2578 int namelen1, namelen2;
2579 char *name1, *name2;
2580 #endif /* DEBUG */
2581
2582 /*
2583 * Read the block containing the "old" attr
2584 */
2585 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1,
2586 XFS_ATTR_FORK);
2587 if (error) {
2588 return(error);
2589 }
2590 ASSERT(bp1 != NULL);
2591
2592 /*
2593 * Read the block containing the "new" attr, if it is different
2594 */
2595 if (args->blkno2 != args->blkno) {
2596 error = xfs_da_read_buf(args->trans, args->dp, args->blkno2,
2597 -1, &bp2, XFS_ATTR_FORK);
2598 if (error) {
2599 return(error);
2600 }
2601 ASSERT(bp2 != NULL);
2602 } else {
2603 bp2 = bp1;
2604 }
2605
2606 leaf1 = bp1->data;
2607 ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
2608 == XFS_ATTR_LEAF_MAGIC);
2609 ASSERT(args->index < INT_GET(leaf1->hdr.count, ARCH_CONVERT));
2610 ASSERT(args->index >= 0);
2611 entry1 = &leaf1->entries[ args->index ];
2612
2613 leaf2 = bp2->data;
2614 ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
2615 == XFS_ATTR_LEAF_MAGIC);
2616 ASSERT(args->index2 < INT_GET(leaf2->hdr.count, ARCH_CONVERT));
2617 ASSERT(args->index2 >= 0);
2618 entry2 = &leaf2->entries[ args->index2 ];
2619
2620 #ifdef DEBUG
2621 if (entry1->flags & XFS_ATTR_LOCAL) {
2622 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index);
2623 namelen1 = name_loc->namelen;
2624 name1 = (char *)name_loc->nameval;
2625 } else {
2626 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
2627 namelen1 = name_rmt->namelen;
2628 name1 = (char *)name_rmt->name;
2629 }
2630 if (entry2->flags & XFS_ATTR_LOCAL) {
2631 name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2);
2632 namelen2 = name_loc->namelen;
2633 name2 = (char *)name_loc->nameval;
2634 } else {
2635 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
2636 namelen2 = name_rmt->namelen;
2637 name2 = (char *)name_rmt->name;
2638 }
2639 ASSERT(INT_GET(entry1->hashval, ARCH_CONVERT) == INT_GET(entry2->hashval, ARCH_CONVERT));
2640 ASSERT(namelen1 == namelen2);
2641 ASSERT(memcmp(name1, name2, namelen1) == 0);
2642 #endif /* DEBUG */
2643
2644 ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE);
2645 ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0);
2646
2647 entry1->flags &= ~XFS_ATTR_INCOMPLETE;
2648 xfs_da_log_buf(args->trans, bp1,
2649 XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1)));
2650 if (args->rmtblkno) {
2651 ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0);
2652 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
2653 INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno);
2654 INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen);
2655 xfs_da_log_buf(args->trans, bp1,
2656 XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt)));
2657 }
2658
2659 entry2->flags |= XFS_ATTR_INCOMPLETE;
2660 xfs_da_log_buf(args->trans, bp2,
2661 XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2)));
2662 if ((entry2->flags & XFS_ATTR_LOCAL) == 0) {
2663 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
2664 name_rmt->valueblk = 0;
2665 name_rmt->valuelen = 0;
2666 xfs_da_log_buf(args->trans, bp2,
2667 XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt)));
2668 }
2669 xfs_da_buf_done(bp1);
2670 if (bp1 != bp2)
2671 xfs_da_buf_done(bp2);
2672
2673 /*
2674 * Commit the flag value change and start the next trans in series.
2675 */
2676 error = xfs_attr_rolltrans(&args->trans, args->dp);
2677
2678 return(error);
2679 }
2680
2681 /*========================================================================
2682 * Indiscriminately delete the entire attribute fork
2683 *========================================================================*/
2684
2685 /*
2686 * Recurse (gasp!) through the attribute nodes until we find leaves.
2687 * We're doing a depth-first traversal in order to invalidate everything.
2688 */
2689 int
2690 xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp)
2691 {
2692 xfs_da_blkinfo_t *info;
2693 xfs_daddr_t blkno;
2694 xfs_dabuf_t *bp;
2695 int error;
2696
2697 /*
2698 * Read block 0 to see what we have to work with.
2699 * We only get here if we have extents, since we remove
2700 * the extents in reverse order the extent containing
2701 * block 0 must still be there.
2702 */
2703 error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
2704 if (error)
2705 return(error);
2706 blkno = xfs_da_blkno(bp);
2707
2708 /*
2709 * Invalidate the tree, even if the "tree" is only a single leaf block.
2710 * This is a depth-first traversal!
2711 */
2712 info = bp->data;
2713 if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) {
2714 error = xfs_attr_node_inactive(trans, dp, bp, 1);
2715 } else if (INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) {
2716 error = xfs_attr_leaf_inactive(trans, dp, bp);
2717 } else {
2718 error = XFS_ERROR(EIO);
2719 xfs_da_brelse(*trans, bp);
2720 }
2721 if (error)
2722 return(error);
2723
2724 /*
2725 * Invalidate the incore copy of the root block.
2726 */
2727 error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
2728 if (error)
2729 return(error);
2730 xfs_da_binval(*trans, bp); /* remove from cache */
2731 /*
2732 * Commit the invalidate and start the next transaction.
2733 */
2734 error = xfs_attr_rolltrans(trans, dp);
2735
2736 return (error);
2737 }
2738
2739 /*
2740 * Recurse (gasp!) through the attribute nodes until we find leaves.
2741 * We're doing a depth-first traversal in order to invalidate everything.
2742 */
2743 int
2744 xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp,
2745 int level)
2746 {
2747 xfs_da_blkinfo_t *info;
2748 xfs_da_intnode_t *node;
2749 xfs_dablk_t child_fsb;
2750 xfs_daddr_t parent_blkno, child_blkno;
2751 int error, count, i;
2752 xfs_dabuf_t *child_bp;
2753
2754 /*
2755 * Since this code is recursive (gasp!) we must protect ourselves.
2756 */
2757 if (level > XFS_DA_NODE_MAXDEPTH) {
2758 xfs_da_brelse(*trans, bp); /* no locks for later trans */
2759 return(XFS_ERROR(EIO));
2760 }
2761
2762 node = bp->data;
2763 ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT)
2764 == XFS_DA_NODE_MAGIC);
2765 parent_blkno = xfs_da_blkno(bp); /* save for re-read later */
2766 count = INT_GET(node->hdr.count, ARCH_CONVERT);
2767 if (!count) {
2768 xfs_da_brelse(*trans, bp);
2769 return(0);
2770 }
2771 child_fsb = INT_GET(node->btree[0].before, ARCH_CONVERT);
2772 xfs_da_brelse(*trans, bp); /* no locks for later trans */
2773
2774 /*
2775 * If this is the node level just above the leaves, simply loop
2776 * over the leaves removing all of them. If this is higher up
2777 * in the tree, recurse downward.
2778 */
2779 for (i = 0; i < count; i++) {
2780 /*
2781 * Read the subsidiary block to see what we have to work with.
2782 * Don't do this in a transaction. This is a depth-first
2783 * traversal of the tree so we may deal with many blocks
2784 * before we come back to this one.
2785 */
2786 error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp,
2787 XFS_ATTR_FORK);
2788 if (error)
2789 return(error);
2790 if (child_bp) {
2791 /* save for re-read later */
2792 child_blkno = xfs_da_blkno(child_bp);
2793
2794 /*
2795 * Invalidate the subtree, however we have to.
2796 */
2797 info = child_bp->data;
2798 if (INT_GET(info->magic, ARCH_CONVERT)
2799 == XFS_DA_NODE_MAGIC) {
2800 error = xfs_attr_node_inactive(trans, dp,
2801 child_bp, level+1);
2802 } else if (INT_GET(info->magic, ARCH_CONVERT)
2803 == XFS_ATTR_LEAF_MAGIC) {
2804 error = xfs_attr_leaf_inactive(trans, dp,
2805 child_bp);
2806 } else {
2807 error = XFS_ERROR(EIO);
2808 xfs_da_brelse(*trans, child_bp);
2809 }
2810 if (error)
2811 return(error);
2812
2813 /*
2814 * Remove the subsidiary block from the cache
2815 * and from the log.
2816 */
2817 error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
2818 &child_bp, XFS_ATTR_FORK);
2819 if (error)
2820 return(error);
2821 xfs_da_binval(*trans, child_bp);
2822 }
2823
2824 /*
2825 * If we're not done, re-read the parent to get the next
2826 * child block number.
2827 */
2828 if ((i+1) < count) {
2829 error = xfs_da_read_buf(*trans, dp, 0, parent_blkno,
2830 &bp, XFS_ATTR_FORK);
2831 if (error)
2832 return(error);
2833 child_fsb = INT_GET(node->btree[i+1].before, ARCH_CONVERT);
2834 xfs_da_brelse(*trans, bp);
2835 }
2836 /*
2837 * Atomically commit the whole invalidate stuff.
2838 */
2839 if ((error = xfs_attr_rolltrans(trans, dp)))
2840 return (error);
2841 }
2842
2843 return(0);
2844 }
2845
2846 /*
2847 * Invalidate all of the "remote" value regions pointed to by a particular
2848 * leaf block.
2849 * Note that we must release the lock on the buffer so that we are not
2850 * caught holding something that the logging code wants to flush to disk.
2851 */
2852 int
2853 xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp)
2854 {
2855 xfs_attr_leafblock_t *leaf;
2856 xfs_attr_leaf_entry_t *entry;
2857 xfs_attr_leaf_name_remote_t *name_rmt;
2858 xfs_attr_inactive_list_t *list, *lp;
2859 int error, count, size, tmp, i;
2860
2861 leaf = bp->data;
2862 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
2863 == XFS_ATTR_LEAF_MAGIC);
2864
2865 /*
2866 * Count the number of "remote" value extents.
2867 */
2868 count = 0;
2869 entry = &leaf->entries[0];
2870 for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
2871 if ( INT_GET(entry->nameidx, ARCH_CONVERT)
2872 && ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
2873 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2874 if (name_rmt->valueblk)
2875 count++;
2876 }
2877 }
2878
2879 /*
2880 * If there are no "remote" values, we're done.
2881 */
2882 if (count == 0) {
2883 xfs_da_brelse(*trans, bp);
2884 return(0);
2885 }
2886
2887 /*
2888 * Allocate storage for a list of all the "remote" value extents.
2889 */
2890 size = count * sizeof(xfs_attr_inactive_list_t);
2891 list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP);
2892
2893 /*
2894 * Identify each of the "remote" value extents.
2895 */
2896 lp = list;
2897 entry = &leaf->entries[0];
2898 for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
2899 if ( INT_GET(entry->nameidx, ARCH_CONVERT)
2900 && ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
2901 name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
2902 if (name_rmt->valueblk) {
2903 /* both on-disk, don't endian flip twice */
2904 lp->valueblk = name_rmt->valueblk;
2905 INT_SET(lp->valuelen, ARCH_CONVERT,
2906 XFS_B_TO_FSB(dp->i_mount,
2907 INT_GET(name_rmt->valuelen,
2908 ARCH_CONVERT)));
2909 lp++;
2910 }
2911 }
2912 }
2913 xfs_da_brelse(*trans, bp); /* unlock for trans. in freextent() */
2914
2915 /*
2916 * Invalidate each of the "remote" value extents.
2917 */
2918 error = 0;
2919 for (lp = list, i = 0; i < count; i++, lp++) {
2920 tmp = xfs_attr_leaf_freextent(trans, dp,
2921 INT_GET(lp->valueblk,
2922 ARCH_CONVERT),
2923 INT_GET(lp->valuelen,
2924 ARCH_CONVERT));
2925 if (error == 0)
2926 error = tmp; /* save only the 1st errno */
2927 }
2928
2929 kmem_free((xfs_caddr_t)list, size);
2930 return(error);
2931 }
2932
2933 /*
2934 * Look at all the extents for this logical region,
2935 * invalidate any buffers that are incore/in transactions.
2936 */
2937 int
2938 xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
2939 xfs_dablk_t blkno, int blkcnt)
2940 {
2941 xfs_bmbt_irec_t map;
2942 xfs_dablk_t tblkno;
2943 int tblkcnt, dblkcnt, nmap, error;
2944 xfs_daddr_t dblkno;
2945 xfs_buf_t *bp;
2946
2947 /*
2948 * Roll through the "value", invalidating the attribute value's
2949 * blocks.
2950 */
2951 tblkno = blkno;
2952 tblkcnt = blkcnt;
2953 while (tblkcnt > 0) {
2954 /*
2955 * Try to remember where we decided to put the value.
2956 */
2957 nmap = 1;
2958 error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt,
2959 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2960 NULL, 0, &map, &nmap, NULL);
2961 if (error) {
2962 return(error);
2963 }
2964 ASSERT(nmap == 1);
2965 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
2966
2967 /*
2968 * If it's a hole, these are already unmapped
2969 * so there's nothing to invalidate.
2970 */
2971 if (map.br_startblock != HOLESTARTBLOCK) {
2972
2973 dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
2974 map.br_startblock);
2975 dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
2976 map.br_blockcount);
2977 bp = xfs_trans_get_buf(*trans,
2978 dp->i_mount->m_ddev_targp,
2979 dblkno, dblkcnt, XFS_BUF_LOCK);
2980 xfs_trans_binval(*trans, bp);
2981 /*
2982 * Roll to next transaction.
2983 */
2984 if ((error = xfs_attr_rolltrans(trans, dp)))
2985 return (error);
2986 }
2987
2988 tblkno += map.br_blockcount;
2989 tblkcnt -= map.br_blockcount;
2990 }
2991
2992 return(0);
2993 }
2994
2995
2996 /*
2997 * Roll from one trans in the sequence of PERMANENT transactions to the next.
2998 */
2999 int
3000 xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp)
3001 {
3002 xfs_trans_t *trans;
3003 unsigned int logres, count;
3004 int error;
3005
3006 /*
3007 * Ensure that the inode is always logged.
3008 */
3009 trans = *transp;
3010 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
3011
3012 /*
3013 * Copy the critical parameters from one trans to the next.
3014 */
3015 logres = trans->t_log_res;
3016 count = trans->t_log_count;
3017 *transp = xfs_trans_dup(trans);
3018
3019 /*
3020 * Commit the current transaction.
3021 * If this commit failed, then it'd just unlock those items that
3022 * are not marked ihold. That also means that a filesystem shutdown
3023 * is in progress. The caller takes the responsibility to cancel
3024 * the duplicate transaction that gets returned.
3025 */
3026 if ((error = xfs_trans_commit(trans, 0, NULL)))
3027 return (error);
3028
3029 trans = *transp;
3030
3031 /*
3032 * Reserve space in the log for th next transaction.
3033 * This also pushes items in the "AIL", the list of logged items,
3034 * out to disk if they are taking up space at the tail of the log
3035 * that we want to use. This requires that either nothing be locked
3036 * across this call, or that anything that is locked be logged in
3037 * the prior and the next transactions.
3038 */
3039 error = xfs_trans_reserve(trans, 0, logres, 0,
3040 XFS_TRANS_PERM_LOG_RES, count);
3041 /*
3042 * Ensure that the inode is in the new transaction and locked.
3043 */
3044 if (!error) {
3045 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
3046 xfs_trans_ihold(trans, dp);
3047 }
3048 return (error);
3049
3050 }
Linux branches of Pieter du Preez