1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/xattr.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <asm/uaccess.h>
17
18 #include "gfs2.h"
19 #include "incore.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include "glock.h"
23 #include "inode.h"
24 #include "meta_io.h"
25 #include "quota.h"
26 #include "rgrp.h"
27 #include "trans.h"
28 #include "util.h"
29
30 /**
31 * ea_calc_size - returns the acutal number of bytes the request will take up
32 * (not counting any unstuffed data blocks)
33 * @sdp:
34 * @er:
35 * @size:
36 *
37 * Returns: 1 if the EA should be stuffed
38 */
39
ea_calc_size(struct gfs2_sbd * sdp,unsigned int nsize,size_t dsize,unsigned int * size)40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
41 unsigned int *size)
42 {
43 unsigned int jbsize = sdp->sd_jbsize;
44
45 /* Stuffed */
46 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
47
48 if (*size <= jbsize)
49 return 1;
50
51 /* Unstuffed */
52 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
53 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
54
55 return 0;
56 }
57
ea_check_size(struct gfs2_sbd * sdp,unsigned int nsize,size_t dsize)58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
59 {
60 unsigned int size;
61
62 if (dsize > GFS2_EA_MAX_DATA_LEN)
63 return -ERANGE;
64
65 ea_calc_size(sdp, nsize, dsize, &size);
66
67 /* This can only happen with 512 byte blocks */
68 if (size > sdp->sd_jbsize)
69 return -ERANGE;
70
71 return 0;
72 }
73
74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
75 struct gfs2_ea_header *ea,
76 struct gfs2_ea_header *prev, void *private);
77
ea_foreach_i(struct gfs2_inode * ip,struct buffer_head * bh,ea_call_t ea_call,void * data)78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
79 ea_call_t ea_call, void *data)
80 {
81 struct gfs2_ea_header *ea, *prev = NULL;
82 int error = 0;
83
84 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
85 return -EIO;
86
87 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
88 if (!GFS2_EA_REC_LEN(ea))
89 goto fail;
90 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
91 bh->b_data + bh->b_size))
92 goto fail;
93 if (!GFS2_EATYPE_VALID(ea->ea_type))
94 goto fail;
95
96 error = ea_call(ip, bh, ea, prev, data);
97 if (error)
98 return error;
99
100 if (GFS2_EA_IS_LAST(ea)) {
101 if ((char *)GFS2_EA2NEXT(ea) !=
102 bh->b_data + bh->b_size)
103 goto fail;
104 break;
105 }
106 }
107
108 return error;
109
110 fail:
111 gfs2_consist_inode(ip);
112 return -EIO;
113 }
114
ea_foreach(struct gfs2_inode * ip,ea_call_t ea_call,void * data)115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
116 {
117 struct buffer_head *bh, *eabh;
118 __be64 *eablk, *end;
119 int error;
120
121 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
122 if (error)
123 return error;
124
125 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
126 error = ea_foreach_i(ip, bh, ea_call, data);
127 goto out;
128 }
129
130 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
131 error = -EIO;
132 goto out;
133 }
134
135 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
136 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
137
138 for (; eablk < end; eablk++) {
139 u64 bn;
140
141 if (!*eablk)
142 break;
143 bn = be64_to_cpu(*eablk);
144
145 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
146 if (error)
147 break;
148 error = ea_foreach_i(ip, eabh, ea_call, data);
149 brelse(eabh);
150 if (error)
151 break;
152 }
153 out:
154 brelse(bh);
155 return error;
156 }
157
158 struct ea_find {
159 int type;
160 const char *name;
161 size_t namel;
162 struct gfs2_ea_location *ef_el;
163 };
164
ea_find_i(struct gfs2_inode * ip,struct buffer_head * bh,struct gfs2_ea_header * ea,struct gfs2_ea_header * prev,void * private)165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
166 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
167 void *private)
168 {
169 struct ea_find *ef = private;
170
171 if (ea->ea_type == GFS2_EATYPE_UNUSED)
172 return 0;
173
174 if (ea->ea_type == ef->type) {
175 if (ea->ea_name_len == ef->namel &&
176 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
177 struct gfs2_ea_location *el = ef->ef_el;
178 get_bh(bh);
179 el->el_bh = bh;
180 el->el_ea = ea;
181 el->el_prev = prev;
182 return 1;
183 }
184 }
185
186 return 0;
187 }
188
gfs2_ea_find(struct gfs2_inode * ip,int type,const char * name,struct gfs2_ea_location * el)189 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
190 struct gfs2_ea_location *el)
191 {
192 struct ea_find ef;
193 int error;
194
195 ef.type = type;
196 ef.name = name;
197 ef.namel = strlen(name);
198 ef.ef_el = el;
199
200 memset(el, 0, sizeof(struct gfs2_ea_location));
201
202 error = ea_foreach(ip, ea_find_i, &ef);
203 if (error > 0)
204 return 0;
205
206 return error;
207 }
208
209 /**
210 * ea_dealloc_unstuffed -
211 * @ip:
212 * @bh:
213 * @ea:
214 * @prev:
215 * @private:
216 *
217 * Take advantage of the fact that all unstuffed blocks are
218 * allocated from the same RG. But watch, this may not always
219 * be true.
220 *
221 * Returns: errno
222 */
223
ea_dealloc_unstuffed(struct gfs2_inode * ip,struct buffer_head * bh,struct gfs2_ea_header * ea,struct gfs2_ea_header * prev,void * private)224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
225 struct gfs2_ea_header *ea,
226 struct gfs2_ea_header *prev, void *private)
227 {
228 int *leave = private;
229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
230 struct gfs2_rgrpd *rgd;
231 struct gfs2_holder rg_gh;
232 struct buffer_head *dibh;
233 __be64 *dataptrs;
234 u64 bn = 0;
235 u64 bstart = 0;
236 unsigned int blen = 0;
237 unsigned int blks = 0;
238 unsigned int x;
239 int error;
240
241 if (GFS2_EA_IS_STUFFED(ea))
242 return 0;
243
244 dataptrs = GFS2_EA2DATAPTRS(ea);
245 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
246 if (*dataptrs) {
247 blks++;
248 bn = be64_to_cpu(*dataptrs);
249 }
250 }
251 if (!blks)
252 return 0;
253
254 rgd = gfs2_blk2rgrpd(sdp, bn);
255 if (!rgd) {
256 gfs2_consist_inode(ip);
257 return -EIO;
258 }
259
260 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
261 if (error)
262 return error;
263
264 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
265 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
266 if (error)
267 goto out_gunlock;
268
269 gfs2_trans_add_bh(ip->i_gl, bh, 1);
270
271 dataptrs = GFS2_EA2DATAPTRS(ea);
272 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
273 if (!*dataptrs)
274 break;
275 bn = be64_to_cpu(*dataptrs);
276
277 if (bstart + blen == bn)
278 blen++;
279 else {
280 if (bstart)
281 gfs2_free_meta(ip, bstart, blen);
282 bstart = bn;
283 blen = 1;
284 }
285
286 *dataptrs = 0;
287 gfs2_add_inode_blocks(&ip->i_inode, -1);
288 }
289 if (bstart)
290 gfs2_free_meta(ip, bstart, blen);
291
292 if (prev && !leave) {
293 u32 len;
294
295 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
296 prev->ea_rec_len = cpu_to_be32(len);
297
298 if (GFS2_EA_IS_LAST(ea))
299 prev->ea_flags |= GFS2_EAFLAG_LAST;
300 } else {
301 ea->ea_type = GFS2_EATYPE_UNUSED;
302 ea->ea_num_ptrs = 0;
303 }
304
305 error = gfs2_meta_inode_buffer(ip, &dibh);
306 if (!error) {
307 ip->i_inode.i_ctime = CURRENT_TIME;
308 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
309 gfs2_dinode_out(ip, dibh->b_data);
310 brelse(dibh);
311 }
312
313 gfs2_trans_end(sdp);
314
315 out_gunlock:
316 gfs2_glock_dq_uninit(&rg_gh);
317 return error;
318 }
319
ea_remove_unstuffed(struct gfs2_inode * ip,struct buffer_head * bh,struct gfs2_ea_header * ea,struct gfs2_ea_header * prev,int leave)320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
321 struct gfs2_ea_header *ea,
322 struct gfs2_ea_header *prev, int leave)
323 {
324 struct gfs2_alloc *al;
325 int error;
326
327 al = gfs2_alloc_get(ip);
328 if (!al)
329 return -ENOMEM;
330
331 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
332 if (error)
333 goto out_alloc;
334
335 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
336 if (error)
337 goto out_quota;
338
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340
341 gfs2_glock_dq_uninit(&al->al_ri_gh);
342
343 out_quota:
344 gfs2_quota_unhold(ip);
345 out_alloc:
346 gfs2_alloc_put(ip);
347 return error;
348 }
349
350 struct ea_list {
351 struct gfs2_ea_request *ei_er;
352 unsigned int ei_size;
353 };
354
gfs2_ea_strlen(struct gfs2_ea_header * ea)355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
356 {
357 switch (ea->ea_type) {
358 case GFS2_EATYPE_USR:
359 return 5 + ea->ea_name_len + 1;
360 case GFS2_EATYPE_SYS:
361 return 7 + ea->ea_name_len + 1;
362 case GFS2_EATYPE_SECURITY:
363 return 9 + ea->ea_name_len + 1;
364 default:
365 return 0;
366 }
367 }
368
ea_list_i(struct gfs2_inode * ip,struct buffer_head * bh,struct gfs2_ea_header * ea,struct gfs2_ea_header * prev,void * private)369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
370 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
371 void *private)
372 {
373 struct ea_list *ei = private;
374 struct gfs2_ea_request *er = ei->ei_er;
375 unsigned int ea_size = gfs2_ea_strlen(ea);
376
377 if (ea->ea_type == GFS2_EATYPE_UNUSED)
378 return 0;
379
380 if (er->er_data_len) {
381 char *prefix = NULL;
382 unsigned int l = 0;
383 char c = 0;
384
385 if (ei->ei_size + ea_size > er->er_data_len)
386 return -ERANGE;
387
388 switch (ea->ea_type) {
389 case GFS2_EATYPE_USR:
390 prefix = "user.";
391 l = 5;
392 break;
393 case GFS2_EATYPE_SYS:
394 prefix = "system.";
395 l = 7;
396 break;
397 case GFS2_EATYPE_SECURITY:
398 prefix = "security.";
399 l = 9;
400 break;
401 }
402
403 BUG_ON(l == 0);
404
405 memcpy(er->er_data + ei->ei_size, prefix, l);
406 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
407 ea->ea_name_len);
408 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
409 }
410
411 ei->ei_size += ea_size;
412
413 return 0;
414 }
415
416 /**
417 * gfs2_listxattr - List gfs2 extended attributes
418 * @dentry: The dentry whose inode we are interested in
419 * @buffer: The buffer to write the results
420 * @size: The size of the buffer
421 *
422 * Returns: actual size of data on success, -errno on error
423 */
424
gfs2_listxattr(struct dentry * dentry,char * buffer,size_t size)425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
426 {
427 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
428 struct gfs2_ea_request er;
429 struct gfs2_holder i_gh;
430 int error;
431
432 memset(&er, 0, sizeof(struct gfs2_ea_request));
433 if (size) {
434 er.er_data = buffer;
435 er.er_data_len = size;
436 }
437
438 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
439 if (error)
440 return error;
441
442 if (ip->i_eattr) {
443 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
444
445 error = ea_foreach(ip, ea_list_i, &ei);
446 if (!error)
447 error = ei.ei_size;
448 }
449
450 gfs2_glock_dq_uninit(&i_gh);
451
452 return error;
453 }
454
455 /**
456 * ea_get_unstuffed - actually copies the unstuffed data into the
457 * request buffer
458 * @ip: The GFS2 inode
459 * @ea: The extended attribute header structure
460 * @data: The data to be copied
461 *
462 * Returns: errno
463 */
464
ea_get_unstuffed(struct gfs2_inode * ip,struct gfs2_ea_header * ea,char * data)465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
466 char *data)
467 {
468 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
469 struct buffer_head **bh;
470 unsigned int amount = GFS2_EA_DATA_LEN(ea);
471 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
472 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
473 unsigned int x;
474 int error = 0;
475
476 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
477 if (!bh)
478 return -ENOMEM;
479
480 for (x = 0; x < nptrs; x++) {
481 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
482 bh + x);
483 if (error) {
484 while (x--)
485 brelse(bh[x]);
486 goto out;
487 }
488 dataptrs++;
489 }
490
491 for (x = 0; x < nptrs; x++) {
492 error = gfs2_meta_wait(sdp, bh[x]);
493 if (error) {
494 for (; x < nptrs; x++)
495 brelse(bh[x]);
496 goto out;
497 }
498 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
499 for (; x < nptrs; x++)
500 brelse(bh[x]);
501 error = -EIO;
502 goto out;
503 }
504
505 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
506 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
507
508 amount -= sdp->sd_jbsize;
509 data += sdp->sd_jbsize;
510
511 brelse(bh[x]);
512 }
513
514 out:
515 kfree(bh);
516 return error;
517 }
518
gfs2_ea_get_copy(struct gfs2_inode * ip,struct gfs2_ea_location * el,char * data,size_t size)519 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
520 char *data, size_t size)
521 {
522 int ret;
523 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
524 if (len > size)
525 return -ERANGE;
526
527 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
528 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
529 return len;
530 }
531 ret = ea_get_unstuffed(ip, el->el_ea, data);
532 if (ret < 0)
533 return ret;
534 return len;
535 }
536
gfs2_xattr_acl_get(struct gfs2_inode * ip,const char * name,char ** ppdata)537 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
538 {
539 struct gfs2_ea_location el;
540 int error;
541 int len;
542 char *data;
543
544 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
545 if (error)
546 return error;
547 if (!el.el_ea)
548 goto out;
549 if (!GFS2_EA_DATA_LEN(el.el_ea))
550 goto out;
551
552 len = GFS2_EA_DATA_LEN(el.el_ea);
553 data = kmalloc(len, GFP_NOFS);
554 error = -ENOMEM;
555 if (data == NULL)
556 goto out;
557
558 error = gfs2_ea_get_copy(ip, &el, data, len);
559 if (error == 0)
560 error = len;
561 *ppdata = data;
562 out:
563 brelse(el.el_bh);
564 return error;
565 }
566
567 /**
568 * gfs2_xattr_get - Get a GFS2 extended attribute
569 * @inode: The inode
570 * @name: The name of the extended attribute
571 * @buffer: The buffer to write the result into
572 * @size: The size of the buffer
573 * @type: The type of extended attribute
574 *
575 * Returns: actual size of data on success, -errno on error
576 */
gfs2_xattr_get(struct dentry * dentry,const char * name,void * buffer,size_t size,int type)577 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
578 void *buffer, size_t size, int type)
579 {
580 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
581 struct gfs2_ea_location el;
582 int error;
583
584 if (!ip->i_eattr)
585 return -ENODATA;
586 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
587 return -EINVAL;
588
589 error = gfs2_ea_find(ip, type, name, &el);
590 if (error)
591 return error;
592 if (!el.el_ea)
593 return -ENODATA;
594 if (size)
595 error = gfs2_ea_get_copy(ip, &el, buffer, size);
596 else
597 error = GFS2_EA_DATA_LEN(el.el_ea);
598 brelse(el.el_bh);
599
600 return error;
601 }
602
603 /**
604 * ea_alloc_blk - allocates a new block for extended attributes.
605 * @ip: A pointer to the inode that's getting extended attributes
606 * @bhp: Pointer to pointer to a struct buffer_head
607 *
608 * Returns: errno
609 */
610
ea_alloc_blk(struct gfs2_inode * ip,struct buffer_head ** bhp)611 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
612 {
613 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
614 struct gfs2_ea_header *ea;
615 unsigned int n = 1;
616 u64 block;
617 int error;
618
619 error = gfs2_alloc_block(ip, &block, &n);
620 if (error)
621 return error;
622 gfs2_trans_add_unrevoke(sdp, block, 1);
623 *bhp = gfs2_meta_new(ip->i_gl, block);
624 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
625 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
626 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
627
628 ea = GFS2_EA_BH2FIRST(*bhp);
629 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
630 ea->ea_type = GFS2_EATYPE_UNUSED;
631 ea->ea_flags = GFS2_EAFLAG_LAST;
632 ea->ea_num_ptrs = 0;
633
634 gfs2_add_inode_blocks(&ip->i_inode, 1);
635
636 return 0;
637 }
638
639 /**
640 * ea_write - writes the request info to an ea, creating new blocks if
641 * necessary
642 * @ip: inode that is being modified
643 * @ea: the location of the new ea in a block
644 * @er: the write request
645 *
646 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
647 *
648 * returns : errno
649 */
650
ea_write(struct gfs2_inode * ip,struct gfs2_ea_header * ea,struct gfs2_ea_request * er)651 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
652 struct gfs2_ea_request *er)
653 {
654 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
655 int error;
656
657 ea->ea_data_len = cpu_to_be32(er->er_data_len);
658 ea->ea_name_len = er->er_name_len;
659 ea->ea_type = er->er_type;
660 ea->__pad = 0;
661
662 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
663
664 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
665 ea->ea_num_ptrs = 0;
666 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
667 } else {
668 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
669 const char *data = er->er_data;
670 unsigned int data_len = er->er_data_len;
671 unsigned int copy;
672 unsigned int x;
673
674 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
675 for (x = 0; x < ea->ea_num_ptrs; x++) {
676 struct buffer_head *bh;
677 u64 block;
678 int mh_size = sizeof(struct gfs2_meta_header);
679 unsigned int n = 1;
680
681 error = gfs2_alloc_block(ip, &block, &n);
682 if (error)
683 return error;
684 gfs2_trans_add_unrevoke(sdp, block, 1);
685 bh = gfs2_meta_new(ip->i_gl, block);
686 gfs2_trans_add_bh(ip->i_gl, bh, 1);
687 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
688
689 gfs2_add_inode_blocks(&ip->i_inode, 1);
690
691 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
692 data_len;
693 memcpy(bh->b_data + mh_size, data, copy);
694 if (copy < sdp->sd_jbsize)
695 memset(bh->b_data + mh_size + copy, 0,
696 sdp->sd_jbsize - copy);
697
698 *dataptr++ = cpu_to_be64(bh->b_blocknr);
699 data += copy;
700 data_len -= copy;
701
702 brelse(bh);
703 }
704
705 gfs2_assert_withdraw(sdp, !data_len);
706 }
707
708 return 0;
709 }
710
711 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
712 struct gfs2_ea_request *er, void *private);
713
ea_alloc_skeleton(struct gfs2_inode * ip,struct gfs2_ea_request * er,unsigned int blks,ea_skeleton_call_t skeleton_call,void * private)714 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
715 unsigned int blks,
716 ea_skeleton_call_t skeleton_call, void *private)
717 {
718 struct gfs2_alloc *al;
719 struct buffer_head *dibh;
720 int error;
721
722 al = gfs2_alloc_get(ip);
723 if (!al)
724 return -ENOMEM;
725
726 error = gfs2_quota_lock_check(ip);
727 if (error)
728 goto out;
729
730 al->al_requested = blks;
731
732 error = gfs2_inplace_reserve(ip);
733 if (error)
734 goto out_gunlock_q;
735
736 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
737 blks + gfs2_rg_blocks(al) +
738 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
739 if (error)
740 goto out_ipres;
741
742 error = skeleton_call(ip, er, private);
743 if (error)
744 goto out_end_trans;
745
746 error = gfs2_meta_inode_buffer(ip, &dibh);
747 if (!error) {
748 ip->i_inode.i_ctime = CURRENT_TIME;
749 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
750 gfs2_dinode_out(ip, dibh->b_data);
751 brelse(dibh);
752 }
753
754 out_end_trans:
755 gfs2_trans_end(GFS2_SB(&ip->i_inode));
756 out_ipres:
757 gfs2_inplace_release(ip);
758 out_gunlock_q:
759 gfs2_quota_unlock(ip);
760 out:
761 gfs2_alloc_put(ip);
762 return error;
763 }
764
ea_init_i(struct gfs2_inode * ip,struct gfs2_ea_request * er,void * private)765 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
766 void *private)
767 {
768 struct buffer_head *bh;
769 int error;
770
771 error = ea_alloc_blk(ip, &bh);
772 if (error)
773 return error;
774
775 ip->i_eattr = bh->b_blocknr;
776 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
777
778 brelse(bh);
779
780 return error;
781 }
782
783 /**
784 * ea_init - initializes a new eattr block
785 * @ip:
786 * @er:
787 *
788 * Returns: errno
789 */
790
ea_init(struct gfs2_inode * ip,int type,const char * name,const void * data,size_t size)791 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
792 const void *data, size_t size)
793 {
794 struct gfs2_ea_request er;
795 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
796 unsigned int blks = 1;
797
798 er.er_type = type;
799 er.er_name = name;
800 er.er_name_len = strlen(name);
801 er.er_data = (void *)data;
802 er.er_data_len = size;
803
804 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
805 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
806
807 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
808 }
809
ea_split_ea(struct gfs2_ea_header * ea)810 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
811 {
812 u32 ea_size = GFS2_EA_SIZE(ea);
813 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
814 ea_size);
815 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
816 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
817
818 ea->ea_rec_len = cpu_to_be32(ea_size);
819 ea->ea_flags ^= last;
820
821 new->ea_rec_len = cpu_to_be32(new_size);
822 new->ea_flags = last;
823
824 return new;
825 }
826
ea_set_remove_stuffed(struct gfs2_inode * ip,struct gfs2_ea_location * el)827 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
828 struct gfs2_ea_location *el)
829 {
830 struct gfs2_ea_header *ea = el->el_ea;
831 struct gfs2_ea_header *prev = el->el_prev;
832 u32 len;
833
834 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
835
836 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
837 ea->ea_type = GFS2_EATYPE_UNUSED;
838 return;
839 } else if (GFS2_EA2NEXT(prev) != ea) {
840 prev = GFS2_EA2NEXT(prev);
841 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
842 }
843
844 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
845 prev->ea_rec_len = cpu_to_be32(len);
846
847 if (GFS2_EA_IS_LAST(ea))
848 prev->ea_flags |= GFS2_EAFLAG_LAST;
849 }
850
851 struct ea_set {
852 int ea_split;
853
854 struct gfs2_ea_request *es_er;
855 struct gfs2_ea_location *es_el;
856
857 struct buffer_head *es_bh;
858 struct gfs2_ea_header *es_ea;
859 };
860
ea_set_simple_noalloc(struct gfs2_inode * ip,struct buffer_head * bh,struct gfs2_ea_header * ea,struct ea_set * es)861 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
862 struct gfs2_ea_header *ea, struct ea_set *es)
863 {
864 struct gfs2_ea_request *er = es->es_er;
865 struct buffer_head *dibh;
866 int error;
867
868 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
869 if (error)
870 return error;
871
872 gfs2_trans_add_bh(ip->i_gl, bh, 1);
873
874 if (es->ea_split)
875 ea = ea_split_ea(ea);
876
877 ea_write(ip, ea, er);
878
879 if (es->es_el)
880 ea_set_remove_stuffed(ip, es->es_el);
881
882 error = gfs2_meta_inode_buffer(ip, &dibh);
883 if (error)
884 goto out;
885 ip->i_inode.i_ctime = CURRENT_TIME;
886 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
887 gfs2_dinode_out(ip, dibh->b_data);
888 brelse(dibh);
889 out:
890 gfs2_trans_end(GFS2_SB(&ip->i_inode));
891 return error;
892 }
893
ea_set_simple_alloc(struct gfs2_inode * ip,struct gfs2_ea_request * er,void * private)894 static int ea_set_simple_alloc(struct gfs2_inode *ip,
895 struct gfs2_ea_request *er, void *private)
896 {
897 struct ea_set *es = private;
898 struct gfs2_ea_header *ea = es->es_ea;
899 int error;
900
901 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
902
903 if (es->ea_split)
904 ea = ea_split_ea(ea);
905
906 error = ea_write(ip, ea, er);
907 if (error)
908 return error;
909
910 if (es->es_el)
911 ea_set_remove_stuffed(ip, es->es_el);
912
913 return 0;
914 }
915
ea_set_simple(struct gfs2_inode * ip,struct buffer_head * bh,struct gfs2_ea_header * ea,struct gfs2_ea_header * prev,void * private)916 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
917 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
918 void *private)
919 {
920 struct ea_set *es = private;
921 unsigned int size;
922 int stuffed;
923 int error;
924
925 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
926 es->es_er->er_data_len, &size);
927
928 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
929 if (GFS2_EA_REC_LEN(ea) < size)
930 return 0;
931 if (!GFS2_EA_IS_STUFFED(ea)) {
932 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
933 if (error)
934 return error;
935 }
936 es->ea_split = 0;
937 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
938 es->ea_split = 1;
939 else
940 return 0;
941
942 if (stuffed) {
943 error = ea_set_simple_noalloc(ip, bh, ea, es);
944 if (error)
945 return error;
946 } else {
947 unsigned int blks;
948
949 es->es_bh = bh;
950 es->es_ea = ea;
951 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
952 GFS2_SB(&ip->i_inode)->sd_jbsize);
953
954 error = ea_alloc_skeleton(ip, es->es_er, blks,
955 ea_set_simple_alloc, es);
956 if (error)
957 return error;
958 }
959
960 return 1;
961 }
962
ea_set_block(struct gfs2_inode * ip,struct gfs2_ea_request * er,void * private)963 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
964 void *private)
965 {
966 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
967 struct buffer_head *indbh, *newbh;
968 __be64 *eablk;
969 int error;
970 int mh_size = sizeof(struct gfs2_meta_header);
971
972 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
973 __be64 *end;
974
975 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
976 &indbh);
977 if (error)
978 return error;
979
980 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
981 error = -EIO;
982 goto out;
983 }
984
985 eablk = (__be64 *)(indbh->b_data + mh_size);
986 end = eablk + sdp->sd_inptrs;
987
988 for (; eablk < end; eablk++)
989 if (!*eablk)
990 break;
991
992 if (eablk == end) {
993 error = -ENOSPC;
994 goto out;
995 }
996
997 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
998 } else {
999 u64 blk;
1000 unsigned int n = 1;
1001 error = gfs2_alloc_block(ip, &blk, &n);
1002 if (error)
1003 return error;
1004 gfs2_trans_add_unrevoke(sdp, blk, 1);
1005 indbh = gfs2_meta_new(ip->i_gl, blk);
1006 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1007 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1008 gfs2_buffer_clear_tail(indbh, mh_size);
1009
1010 eablk = (__be64 *)(indbh->b_data + mh_size);
1011 *eablk = cpu_to_be64(ip->i_eattr);
1012 ip->i_eattr = blk;
1013 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1014 gfs2_add_inode_blocks(&ip->i_inode, 1);
1015
1016 eablk++;
1017 }
1018
1019 error = ea_alloc_blk(ip, &newbh);
1020 if (error)
1021 goto out;
1022
1023 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1024 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1025 brelse(newbh);
1026 if (error)
1027 goto out;
1028
1029 if (private)
1030 ea_set_remove_stuffed(ip, private);
1031
1032 out:
1033 brelse(indbh);
1034 return error;
1035 }
1036
ea_set_i(struct gfs2_inode * ip,int type,const char * name,const void * value,size_t size,struct gfs2_ea_location * el)1037 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1038 const void *value, size_t size, struct gfs2_ea_location *el)
1039 {
1040 struct gfs2_ea_request er;
1041 struct ea_set es;
1042 unsigned int blks = 2;
1043 int error;
1044
1045 er.er_type = type;
1046 er.er_name = name;
1047 er.er_data = (void *)value;
1048 er.er_name_len = strlen(name);
1049 er.er_data_len = size;
1050
1051 memset(&es, 0, sizeof(struct ea_set));
1052 es.es_er = &er;
1053 es.es_el = el;
1054
1055 error = ea_foreach(ip, ea_set_simple, &es);
1056 if (error > 0)
1057 return 0;
1058 if (error)
1059 return error;
1060
1061 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1062 blks++;
1063 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1064 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1065
1066 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1067 }
1068
ea_set_remove_unstuffed(struct gfs2_inode * ip,struct gfs2_ea_location * el)1069 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1070 struct gfs2_ea_location *el)
1071 {
1072 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1073 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1074 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1075 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1076 }
1077
1078 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1079 }
1080
ea_remove_stuffed(struct gfs2_inode * ip,struct gfs2_ea_location * el)1081 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1082 {
1083 struct gfs2_ea_header *ea = el->el_ea;
1084 struct gfs2_ea_header *prev = el->el_prev;
1085 struct buffer_head *dibh;
1086 int error;
1087
1088 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1089 if (error)
1090 return error;
1091
1092 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1093
1094 if (prev) {
1095 u32 len;
1096
1097 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1098 prev->ea_rec_len = cpu_to_be32(len);
1099
1100 if (GFS2_EA_IS_LAST(ea))
1101 prev->ea_flags |= GFS2_EAFLAG_LAST;
1102 } else {
1103 ea->ea_type = GFS2_EATYPE_UNUSED;
1104 }
1105
1106 error = gfs2_meta_inode_buffer(ip, &dibh);
1107 if (!error) {
1108 ip->i_inode.i_ctime = CURRENT_TIME;
1109 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1110 gfs2_dinode_out(ip, dibh->b_data);
1111 brelse(dibh);
1112 }
1113
1114 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1115
1116 return error;
1117 }
1118
1119 /**
1120 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1121 * @ip: The inode
1122 * @type: The type of the extended attribute
1123 * @name: The name of the extended attribute
1124 *
1125 * This is not called directly by the VFS since we use the (common)
1126 * scheme of making a "set with NULL data" mean a remove request. Note
1127 * that this is different from a set with zero length data.
1128 *
1129 * Returns: 0, or errno on failure
1130 */
1131
gfs2_xattr_remove(struct gfs2_inode * ip,int type,const char * name)1132 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1133 {
1134 struct gfs2_ea_location el;
1135 int error;
1136
1137 if (!ip->i_eattr)
1138 return -ENODATA;
1139
1140 error = gfs2_ea_find(ip, type, name, &el);
1141 if (error)
1142 return error;
1143 if (!el.el_ea)
1144 return -ENODATA;
1145
1146 if (GFS2_EA_IS_STUFFED(el.el_ea))
1147 error = ea_remove_stuffed(ip, &el);
1148 else
1149 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1150
1151 brelse(el.el_bh);
1152
1153 return error;
1154 }
1155
1156 /**
1157 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1158 * @ip: The inode
1159 * @name: The name of the extended attribute
1160 * @value: The value of the extended attribute (NULL for remove)
1161 * @size: The size of the @value argument
1162 * @flags: Create or Replace
1163 * @type: The type of the extended attribute
1164 *
1165 * See gfs2_xattr_remove() for details of the removal of xattrs.
1166 *
1167 * Returns: 0 or errno on failure
1168 */
1169
__gfs2_xattr_set(struct inode * inode,const char * name,const void * value,size_t size,int flags,int type)1170 int __gfs2_xattr_set(struct inode *inode, const char *name,
1171 const void *value, size_t size, int flags, int type)
1172 {
1173 struct gfs2_inode *ip = GFS2_I(inode);
1174 struct gfs2_sbd *sdp = GFS2_SB(inode);
1175 struct gfs2_ea_location el;
1176 unsigned int namel = strlen(name);
1177 int error;
1178
1179 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1180 return -EPERM;
1181 if (namel > GFS2_EA_MAX_NAME_LEN)
1182 return -ERANGE;
1183
1184 if (value == NULL)
1185 return gfs2_xattr_remove(ip, type, name);
1186
1187 if (ea_check_size(sdp, namel, size))
1188 return -ERANGE;
1189
1190 if (!ip->i_eattr) {
1191 if (flags & XATTR_REPLACE)
1192 return -ENODATA;
1193 return ea_init(ip, type, name, value, size);
1194 }
1195
1196 error = gfs2_ea_find(ip, type, name, &el);
1197 if (error)
1198 return error;
1199
1200 if (el.el_ea) {
1201 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1202 brelse(el.el_bh);
1203 return -EPERM;
1204 }
1205
1206 error = -EEXIST;
1207 if (!(flags & XATTR_CREATE)) {
1208 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1209 error = ea_set_i(ip, type, name, value, size, &el);
1210 if (!error && unstuffed)
1211 ea_set_remove_unstuffed(ip, &el);
1212 }
1213
1214 brelse(el.el_bh);
1215 return error;
1216 }
1217
1218 error = -ENODATA;
1219 if (!(flags & XATTR_REPLACE))
1220 error = ea_set_i(ip, type, name, value, size, NULL);
1221
1222 return error;
1223 }
1224
gfs2_xattr_set(struct dentry * dentry,const char * name,const void * value,size_t size,int flags,int type)1225 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1226 const void *value, size_t size, int flags, int type)
1227 {
1228 return __gfs2_xattr_set(dentry->d_inode, name, value,
1229 size, flags, type);
1230 }
1231
ea_acl_chmod_unstuffed(struct gfs2_inode * ip,struct gfs2_ea_header * ea,char * data)1232 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1233 struct gfs2_ea_header *ea, char *data)
1234 {
1235 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1236 struct buffer_head **bh;
1237 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1238 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1239 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1240 unsigned int x;
1241 int error;
1242
1243 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1244 if (!bh)
1245 return -ENOMEM;
1246
1247 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1248 if (error)
1249 goto out;
1250
1251 for (x = 0; x < nptrs; x++) {
1252 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1253 bh + x);
1254 if (error) {
1255 while (x--)
1256 brelse(bh[x]);
1257 goto fail;
1258 }
1259 dataptrs++;
1260 }
1261
1262 for (x = 0; x < nptrs; x++) {
1263 error = gfs2_meta_wait(sdp, bh[x]);
1264 if (error) {
1265 for (; x < nptrs; x++)
1266 brelse(bh[x]);
1267 goto fail;
1268 }
1269 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1270 for (; x < nptrs; x++)
1271 brelse(bh[x]);
1272 error = -EIO;
1273 goto fail;
1274 }
1275
1276 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1277
1278 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1279 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1280
1281 amount -= sdp->sd_jbsize;
1282 data += sdp->sd_jbsize;
1283
1284 brelse(bh[x]);
1285 }
1286
1287 out:
1288 kfree(bh);
1289 return error;
1290
1291 fail:
1292 gfs2_trans_end(sdp);
1293 kfree(bh);
1294 return error;
1295 }
1296
gfs2_xattr_acl_chmod(struct gfs2_inode * ip,struct iattr * attr,char * data)1297 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1298 {
1299 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1300 struct gfs2_ea_location el;
1301 int error;
1302
1303 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1304 if (error)
1305 return error;
1306
1307 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1308 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1309 if (error == 0) {
1310 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1311 memcpy(GFS2_EA2DATA(el.el_ea), data,
1312 GFS2_EA_DATA_LEN(el.el_ea));
1313 }
1314 } else {
1315 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1316 }
1317
1318 brelse(el.el_bh);
1319 if (error)
1320 return error;
1321
1322 error = gfs2_setattr_simple(ip, attr);
1323 gfs2_trans_end(sdp);
1324 return error;
1325 }
1326
ea_dealloc_indirect(struct gfs2_inode * ip)1327 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1328 {
1329 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1330 struct gfs2_rgrp_list rlist;
1331 struct buffer_head *indbh, *dibh;
1332 __be64 *eablk, *end;
1333 unsigned int rg_blocks = 0;
1334 u64 bstart = 0;
1335 unsigned int blen = 0;
1336 unsigned int blks = 0;
1337 unsigned int x;
1338 int error;
1339
1340 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1341
1342 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1343 if (error)
1344 return error;
1345
1346 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1347 error = -EIO;
1348 goto out;
1349 }
1350
1351 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1352 end = eablk + sdp->sd_inptrs;
1353
1354 for (; eablk < end; eablk++) {
1355 u64 bn;
1356
1357 if (!*eablk)
1358 break;
1359 bn = be64_to_cpu(*eablk);
1360
1361 if (bstart + blen == bn)
1362 blen++;
1363 else {
1364 if (bstart)
1365 gfs2_rlist_add(sdp, &rlist, bstart);
1366 bstart = bn;
1367 blen = 1;
1368 }
1369 blks++;
1370 }
1371 if (bstart)
1372 gfs2_rlist_add(sdp, &rlist, bstart);
1373 else
1374 goto out;
1375
1376 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1377
1378 for (x = 0; x < rlist.rl_rgrps; x++) {
1379 struct gfs2_rgrpd *rgd;
1380 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1381 rg_blocks += rgd->rd_length;
1382 }
1383
1384 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385 if (error)
1386 goto out_rlist_free;
1387
1388 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1389 RES_STATFS + RES_QUOTA, blks);
1390 if (error)
1391 goto out_gunlock;
1392
1393 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1394
1395 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1396 bstart = 0;
1397 blen = 0;
1398
1399 for (; eablk < end; eablk++) {
1400 u64 bn;
1401
1402 if (!*eablk)
1403 break;
1404 bn = be64_to_cpu(*eablk);
1405
1406 if (bstart + blen == bn)
1407 blen++;
1408 else {
1409 if (bstart)
1410 gfs2_free_meta(ip, bstart, blen);
1411 bstart = bn;
1412 blen = 1;
1413 }
1414
1415 *eablk = 0;
1416 gfs2_add_inode_blocks(&ip->i_inode, -1);
1417 }
1418 if (bstart)
1419 gfs2_free_meta(ip, bstart, blen);
1420
1421 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1422
1423 error = gfs2_meta_inode_buffer(ip, &dibh);
1424 if (!error) {
1425 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1426 gfs2_dinode_out(ip, dibh->b_data);
1427 brelse(dibh);
1428 }
1429
1430 gfs2_trans_end(sdp);
1431
1432 out_gunlock:
1433 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1434 out_rlist_free:
1435 gfs2_rlist_free(&rlist);
1436 out:
1437 brelse(indbh);
1438 return error;
1439 }
1440
ea_dealloc_block(struct gfs2_inode * ip)1441 static int ea_dealloc_block(struct gfs2_inode *ip)
1442 {
1443 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1444 struct gfs2_alloc *al = ip->i_alloc;
1445 struct gfs2_rgrpd *rgd;
1446 struct buffer_head *dibh;
1447 int error;
1448
1449 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1450 if (!rgd) {
1451 gfs2_consist_inode(ip);
1452 return -EIO;
1453 }
1454
1455 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1456 &al->al_rgd_gh);
1457 if (error)
1458 return error;
1459
1460 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1461 RES_QUOTA, 1);
1462 if (error)
1463 goto out_gunlock;
1464
1465 gfs2_free_meta(ip, ip->i_eattr, 1);
1466
1467 ip->i_eattr = 0;
1468 gfs2_add_inode_blocks(&ip->i_inode, -1);
1469
1470 error = gfs2_meta_inode_buffer(ip, &dibh);
1471 if (!error) {
1472 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1473 gfs2_dinode_out(ip, dibh->b_data);
1474 brelse(dibh);
1475 }
1476
1477 gfs2_trans_end(sdp);
1478
1479 out_gunlock:
1480 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1481 return error;
1482 }
1483
1484 /**
1485 * gfs2_ea_dealloc - deallocate the extended attribute fork
1486 * @ip: the inode
1487 *
1488 * Returns: errno
1489 */
1490
gfs2_ea_dealloc(struct gfs2_inode * ip)1491 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1492 {
1493 struct gfs2_alloc *al;
1494 int error;
1495
1496 al = gfs2_alloc_get(ip);
1497 if (!al)
1498 return -ENOMEM;
1499
1500 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1501 if (error)
1502 goto out_alloc;
1503
1504 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1505 if (error)
1506 goto out_quota;
1507
1508 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1509 if (error)
1510 goto out_rindex;
1511
1512 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513 error = ea_dealloc_indirect(ip);
1514 if (error)
1515 goto out_rindex;
1516 }
1517
1518 error = ea_dealloc_block(ip);
1519
1520 out_rindex:
1521 gfs2_glock_dq_uninit(&al->al_ri_gh);
1522 out_quota:
1523 gfs2_quota_unhold(ip);
1524 out_alloc:
1525 gfs2_alloc_put(ip);
1526 return error;
1527 }
1528
1529 static const struct xattr_handler gfs2_xattr_user_handler = {
1530 .prefix = XATTR_USER_PREFIX,
1531 .flags = GFS2_EATYPE_USR,
1532 .get = gfs2_xattr_get,
1533 .set = gfs2_xattr_set,
1534 };
1535
1536 static const struct xattr_handler gfs2_xattr_security_handler = {
1537 .prefix = XATTR_SECURITY_PREFIX,
1538 .flags = GFS2_EATYPE_SECURITY,
1539 .get = gfs2_xattr_get,
1540 .set = gfs2_xattr_set,
1541 };
1542
1543 const struct xattr_handler *gfs2_xattr_handlers[] = {
1544 &gfs2_xattr_user_handler,
1545 &gfs2_xattr_security_handler,
1546 &gfs2_xattr_system_handler,
1547 NULL,
1548 };
1549
1550