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[PATCH] core-dumping unreadable binaries via PT_INTERP
[linux-2.6/verdex.git] / fs / jffs2 / xattr.c
blob4bb3f189733027d159462f91a131b929909481f4
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2006 NEC Corporation
5 *
6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/fs.h>
14 #include <linux/time.h>
15 #include <linux/pagemap.h>
16 #include <linux/highmem.h>
17 #include <linux/crc32.h>
18 #include <linux/jffs2.h>
19 #include <linux/xattr.h>
20 #include <linux/mtd/mtd.h>
21 #include "nodelist.h"
22 /* -------- xdatum related functions ----------------
23 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize)
24 * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is
25 * the index of the xattr name/value pair cache (c->xattrindex).
26 * is_xattr_datum_unchecked(c, xd)
27 * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not
28 * unchecked, it returns 0.
29 * unload_xattr_datum(c, xd)
30 * is used to release xattr name/value pair and detach from c->xattrindex.
31 * reclaim_xattr_datum(c)
32 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when
33 * memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold
34 * is hard coded as 32KiB.
35 * do_verify_xattr_datum(c, xd)
36 * is used to load the xdatum informations without name/value pair from the medium.
37 * It's necessary once, because those informations are not collected during mounting
38 * process when EBS is enabled.
39 * 0 will be returned, if success. An negative return value means recoverable error, and
40 * positive return value means unrecoverable error. Thus, caller must remove this xdatum
41 * and xref when it returned positive value.
42 * do_load_xattr_datum(c, xd)
43 * is used to load name/value pair from the medium.
44 * The meanings of return value is same as do_verify_xattr_datum().
45 * load_xattr_datum(c, xd)
46 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum().
47 * If xd need to call do_verify_xattr_datum() at first, it's called before calling
48 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum().
49 * save_xattr_datum(c, xd)
50 * is used to write xdatum to medium. xd->version will be incremented.
51 * create_xattr_datum(c, xprefix, xname, xvalue, xsize)
52 * is used to create new xdatum and write to medium.
53 * unrefer_xattr_datum(c, xd)
54 * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD
55 * is set on xd->flags and chained xattr_dead_list or release it immediately.
56 * In the first case, the garbage collector release it later.
57 * -------------------------------------------------- */
58 static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)
59 {
60 int name_len = strlen(xname);
61
62 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize);
63 }
64
65 static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
66 {
67 struct jffs2_raw_node_ref *raw;
68 int rc = 0;
69
70 spin_lock(&c->erase_completion_lock);
71 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
72 if (ref_flags(raw) == REF_UNCHECKED) {
73 rc = 1;
74 break;
75 }
76 }
77 spin_unlock(&c->erase_completion_lock);
78 return rc;
79 }
80
81 static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
82 {
83 /* must be called under down_write(xattr_sem) */
84 D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version));
85 if (xd->xname) {
86 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);
87 kfree(xd->xname);
88 }
89
90 list_del_init(&xd->xindex);
91 xd->hashkey = 0;
92 xd->xname = NULL;
93 xd->xvalue = NULL;
94 }
95
96 static void reclaim_xattr_datum(struct jffs2_sb_info *c)
97 {
98 /* must be called under down_write(xattr_sem) */
99 struct jffs2_xattr_datum *xd, *_xd;
100 uint32_t target, before;
101 static int index = 0;
102 int count;
103
104 if (c->xdatum_mem_threshold > c->xdatum_mem_usage)
105 return;
106
107 before = c->xdatum_mem_usage;
108 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */
109 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {
110 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {
111 if (xd->flags & JFFS2_XFLAGS_HOT) {
112 xd->flags &= ~JFFS2_XFLAGS_HOT;
113 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {
114 unload_xattr_datum(c, xd);
115 }
116 if (c->xdatum_mem_usage <= target)
117 goto out;
118 }
119 index = (index+1) % XATTRINDEX_HASHSIZE;
120 }
121 out:
122 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",
123 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
124 }
125
126 static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
127 {
128 /* must be called under down_write(xattr_sem) */
129 struct jffs2_eraseblock *jeb;
130 struct jffs2_raw_node_ref *raw;
131 struct jffs2_raw_xattr rx;
132 size_t readlen;
133 uint32_t crc, offset, totlen;
134 int rc;
135
136 spin_lock(&c->erase_completion_lock);
137 offset = ref_offset(xd->node);
138 if (ref_flags(xd->node) == REF_PRISTINE)
139 goto complete;
140 spin_unlock(&c->erase_completion_lock);
141
142 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx);
143 if (rc || readlen != sizeof(rx)) {
144 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
145 rc, sizeof(rx), readlen, offset);
146 return rc ? rc : -EIO;
147 }
148 crc = crc32(0, &rx, sizeof(rx) - 4);
149 if (crc != je32_to_cpu(rx.node_crc)) {
150 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
151 offset, je32_to_cpu(rx.hdr_crc), crc);
152 xd->flags |= JFFS2_XFLAGS_INVALID;
153 return EIO;
154 }
155 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len));
156 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK
157 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR
158 || je32_to_cpu(rx.totlen) != totlen
159 || je32_to_cpu(rx.xid) != xd->xid
160 || je32_to_cpu(rx.version) != xd->version) {
161 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "
162 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",
163 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
164 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,
165 je32_to_cpu(rx.totlen), totlen,
166 je32_to_cpu(rx.xid), xd->xid,
167 je32_to_cpu(rx.version), xd->version);
168 xd->flags |= JFFS2_XFLAGS_INVALID;
169 return EIO;
170 }
171 xd->xprefix = rx.xprefix;
172 xd->name_len = rx.name_len;
173 xd->value_len = je16_to_cpu(rx.value_len);
174 xd->data_crc = je32_to_cpu(rx.data_crc);
175
176 spin_lock(&c->erase_completion_lock);
177 complete:
178 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
179 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
180 totlen = PAD(ref_totlen(c, jeb, raw));
181 if (ref_flags(raw) == REF_UNCHECKED) {
182 c->unchecked_size -= totlen; c->used_size += totlen;
183 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
184 }
185 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL);
186 }
187 spin_unlock(&c->erase_completion_lock);
188
189 /* unchecked xdatum is chained with c->xattr_unchecked */
190 list_del_init(&xd->xindex);
191
192 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",
193 xd->xid, xd->version);
194
195 return 0;
196 }
197
198 static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
199 {
200 /* must be called under down_write(xattr_sem) */
201 char *data;
202 size_t readlen;
203 uint32_t crc, length;
204 int i, ret, retry = 0;
205
206 BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
207 BUG_ON(!list_empty(&xd->xindex));
208 retry:
209 length = xd->name_len + 1 + xd->value_len;
210 data = kmalloc(length, GFP_KERNEL);
211 if (!data)
212 return -ENOMEM;
213
214 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),
215 length, &readlen, data);
216
217 if (ret || length!=readlen) {
218 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n",
219 ret, length, readlen, ref_offset(xd->node));
220 kfree(data);
221 return ret ? ret : -EIO;
222 }
223
224 data[xd->name_len] = '\0';
225 crc = crc32(0, data, length);
226 if (crc != xd->data_crc) {
227 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)"
228 " at %#08x, read: 0x%08x calculated: 0x%08x\n",
229 ref_offset(xd->node), xd->data_crc, crc);
230 kfree(data);
231 xd->flags |= JFFS2_XFLAGS_INVALID;
232 return EIO;
233 }
234
235 xd->flags |= JFFS2_XFLAGS_HOT;
236 xd->xname = data;
237 xd->xvalue = data + xd->name_len+1;
238
239 c->xdatum_mem_usage += length;
240
241 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);
242 i = xd->hashkey % XATTRINDEX_HASHSIZE;
243 list_add(&xd->xindex, &c->xattrindex[i]);
244 if (!retry) {
245 retry = 1;
246 reclaim_xattr_datum(c);
247 if (!xd->xname)
248 goto retry;
249 }
250
251 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",
252 xd->xid, xd->xprefix, xd->xname);
253
254 return 0;
255 }
256
257 static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
258 {
259 /* must be called under down_write(xattr_sem);
260 * rc < 0 : recoverable error, try again
261 * rc = 0 : success
262 * rc > 0 : Unrecoverable error, this node should be deleted.
263 */
264 int rc = 0;
265
266 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);
267 if (xd->xname)
268 return 0;
269 if (xd->flags & JFFS2_XFLAGS_INVALID)
270 return EIO;
271 if (unlikely(is_xattr_datum_unchecked(c, xd)))
272 rc = do_verify_xattr_datum(c, xd);
273 if (!rc)
274 rc = do_load_xattr_datum(c, xd);
275 return rc;
276 }
277
278 static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
279 {
280 /* must be called under down_write(xattr_sem) */
281 struct jffs2_raw_xattr rx;
282 struct kvec vecs[2];
283 size_t length;
284 int rc, totlen;
285 uint32_t phys_ofs = write_ofs(c);
286
287 BUG_ON(!xd->xname);
288 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID));
289
290 vecs[0].iov_base = &rx;
291 vecs[0].iov_len = sizeof(rx);
292 vecs[1].iov_base = xd->xname;
293 vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
294 totlen = vecs[0].iov_len + vecs[1].iov_len;
295
296 /* Setup raw-xattr */
297 memset(&rx, 0, sizeof(rx));
298 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
299 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
300 rx.totlen = cpu_to_je32(PAD(totlen));
301 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
302
303 rx.xid = cpu_to_je32(xd->xid);
304 rx.version = cpu_to_je32(++xd->version);
305 rx.xprefix = xd->xprefix;
306 rx.name_len = xd->name_len;
307 rx.value_len = cpu_to_je16(xd->value_len);
308 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
309 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
310
311 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);
312 if (rc || totlen != length) {
313 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",
314 rc, totlen, length, phys_ofs);
315 rc = rc ? rc : -EIO;
316 if (length)
317 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);
318
319 return rc;
320 }
321 /* success */
322 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd);
323
324 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
325 xd->xid, xd->version, xd->xprefix, xd->xname);
326
327 return 0;
328 }
329
330 static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
331 int xprefix, const char *xname,
332 const char *xvalue, int xsize)
333 {
334 /* must be called under down_write(xattr_sem) */
335 struct jffs2_xattr_datum *xd;
336 uint32_t hashkey, name_len;
337 char *data;
338 int i, rc;
339
340 /* Search xattr_datum has same xname/xvalue by index */
341 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
342 i = hashkey % XATTRINDEX_HASHSIZE;
343 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
344 if (xd->hashkey==hashkey
345 && xd->xprefix==xprefix
346 && xd->value_len==xsize
347 && !strcmp(xd->xname, xname)
348 && !memcmp(xd->xvalue, xvalue, xsize)) {
349 atomic_inc(&xd->refcnt);
350 return xd;
351 }
352 }
353
354 /* Not found, Create NEW XATTR-Cache */
355 name_len = strlen(xname);
356
357 xd = jffs2_alloc_xattr_datum();
358 if (!xd)
359 return ERR_PTR(-ENOMEM);
360
361 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
362 if (!data) {
363 jffs2_free_xattr_datum(xd);
364 return ERR_PTR(-ENOMEM);
365 }
366 strcpy(data, xname);
367 memcpy(data + name_len + 1, xvalue, xsize);
368
369 atomic_set(&xd->refcnt, 1);
370 xd->xid = ++c->highest_xid;
371 xd->flags |= JFFS2_XFLAGS_HOT;
372 xd->xprefix = xprefix;
373
374 xd->hashkey = hashkey;
375 xd->xname = data;
376 xd->xvalue = data + name_len + 1;
377 xd->name_len = name_len;
378 xd->value_len = xsize;
379 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
380
381 rc = save_xattr_datum(c, xd);
382 if (rc) {
383 kfree(xd->xname);
384 jffs2_free_xattr_datum(xd);
385 return ERR_PTR(rc);
386 }
387
388 /* Insert Hash Index */
389 i = hashkey % XATTRINDEX_HASHSIZE;
390 list_add(&xd->xindex, &c->xattrindex[i]);
391
392 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
393 reclaim_xattr_datum(c);
394
395 return xd;
396 }
397
398 static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
399 {
400 /* must be called under down_write(xattr_sem) */
401 if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) {
402 unload_xattr_datum(c, xd);
403 xd->flags |= JFFS2_XFLAGS_DEAD;
404 if (xd->node == (void *)xd) {
405 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID));
406 jffs2_free_xattr_datum(xd);
407 } else {
408 list_add(&xd->xindex, &c->xattr_dead_list);
409 }
410 spin_unlock(&c->erase_completion_lock);
411
412 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n",
413 xd->xid, xd->version);
414 }
415 }
416
417 /* -------- xref related functions ------------------
418 * verify_xattr_ref(c, ref)
419 * is used to load xref information from medium. Because summary data does not
420 * contain xid/ino, it's necessary to verify once while mounting process.
421 * save_xattr_ref(c, ref)
422 * is used to write xref to medium. If delete marker is marked, it write
423 * a delete marker of xref into medium.
424 * create_xattr_ref(c, ic, xd)
425 * is used to create a new xref and write to medium.
426 * delete_xattr_ref(c, ref)
427 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER,
428 * and allows GC to reclaim those physical nodes.
429 * jffs2_xattr_delete_inode(c, ic)
430 * is called to remove xrefs related to obsolete inode when inode is unlinked.
431 * jffs2_xattr_free_inode(c, ic)
432 * is called to release xattr related objects when unmounting.
433 * check_xattr_ref_inode(c, ic)
434 * is used to confirm inode does not have duplicate xattr name/value pair.
435 * -------------------------------------------------- */
436 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
437 {
438 struct jffs2_eraseblock *jeb;
439 struct jffs2_raw_node_ref *raw;
440 struct jffs2_raw_xref rr;
441 size_t readlen;
442 uint32_t crc, offset, totlen;
443 int rc;
444
445 spin_lock(&c->erase_completion_lock);
446 if (ref_flags(ref->node) != REF_UNCHECKED)
447 goto complete;
448 offset = ref_offset(ref->node);
449 spin_unlock(&c->erase_completion_lock);
450
451 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);
452 if (rc || sizeof(rr) != readlen) {
453 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
454 rc, sizeof(rr), readlen, offset);
455 return rc ? rc : -EIO;
456 }
457 /* obsolete node */
458 crc = crc32(0, &rr, sizeof(rr) - 4);
459 if (crc != je32_to_cpu(rr.node_crc)) {
460 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
461 offset, je32_to_cpu(rr.node_crc), crc);
462 return EIO;
463 }
464 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
465 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
466 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
467 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
468 "nodetype=%#04x/%#04x, totlen=%u/%zu\n",
469 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
470 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
471 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
472 return EIO;
473 }
474 ref->ino = je32_to_cpu(rr.ino);
475 ref->xid = je32_to_cpu(rr.xid);
476 ref->xseqno = je32_to_cpu(rr.xseqno);
477 if (ref->xseqno > c->highest_xseqno)
478 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
479
480 spin_lock(&c->erase_completion_lock);
481 complete:
482 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {
483 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
484 totlen = PAD(ref_totlen(c, jeb, raw));
485 if (ref_flags(raw) == REF_UNCHECKED) {
486 c->unchecked_size -= totlen; c->used_size += totlen;
487 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
488 }
489 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);
490 }
491 spin_unlock(&c->erase_completion_lock);
492
493 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
494 ref->ino, ref->xid, ref_offset(ref->node));
495 return 0;
496 }
497
498 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
499 {
500 /* must be called under down_write(xattr_sem) */
501 struct jffs2_raw_xref rr;
502 size_t length;
503 uint32_t xseqno, phys_ofs = write_ofs(c);
504 int ret;
505
506 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
507 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
508 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
509 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
510
511 xseqno = (c->highest_xseqno += 2);
512 if (is_xattr_ref_dead(ref)) {
513 xseqno |= XREF_DELETE_MARKER;
514 rr.ino = cpu_to_je32(ref->ino);
515 rr.xid = cpu_to_je32(ref->xid);
516 } else {
517 rr.ino = cpu_to_je32(ref->ic->ino);
518 rr.xid = cpu_to_je32(ref->xd->xid);
519 }
520 rr.xseqno = cpu_to_je32(xseqno);
521 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
522
523 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
524 if (ret || sizeof(rr) != length) {
525 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
526 ret, sizeof(rr), length, phys_ofs);
527 ret = ret ? ret : -EIO;
528 if (length)
529 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
530
531 return ret;
532 }
533 /* success */
534 ref->xseqno = xseqno;
535 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);
536
537 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
538
539 return 0;
540 }
541
542 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
543 struct jffs2_xattr_datum *xd)
544 {
545 /* must be called under down_write(xattr_sem) */
546 struct jffs2_xattr_ref *ref;
547 int ret;
548
549 ref = jffs2_alloc_xattr_ref();
550 if (!ref)
551 return ERR_PTR(-ENOMEM);
552 ref->ic = ic;
553 ref->xd = xd;
554
555 ret = save_xattr_ref(c, ref);
556 if (ret) {
557 jffs2_free_xattr_ref(ref);
558 return ERR_PTR(ret);
559 }
560
561 /* Chain to inode */
562 ref->next = ic->xref;
563 ic->xref = ref;
564
565 return ref; /* success */
566 }
567
568 static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
569 {
570 /* must be called under down_write(xattr_sem) */
571 struct jffs2_xattr_datum *xd;
572
573 xd = ref->xd;
574 ref->xseqno |= XREF_DELETE_MARKER;
575 ref->ino = ref->ic->ino;
576 ref->xid = ref->xd->xid;
577 spin_lock(&c->erase_completion_lock);
578 ref->next = c->xref_dead_list;
579 c->xref_dead_list = ref;
580 spin_unlock(&c->erase_completion_lock);
581
582 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
583 ref->ino, ref->xid, ref->xseqno);
584
585 unrefer_xattr_datum(c, xd);
586 }
587
588 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
589 {
590 /* It's called from jffs2_clear_inode() on inode removing.
591 When an inode with XATTR is removed, those XATTRs must be removed. */
592 struct jffs2_xattr_ref *ref, *_ref;
593
594 if (!ic || ic->nlink > 0)
595 return;
596
597 down_write(&c->xattr_sem);
598 for (ref = ic->xref; ref; ref = _ref) {
599 _ref = ref->next;
600 delete_xattr_ref(c, ref);
601 }
602 ic->xref = NULL;
603 up_write(&c->xattr_sem);
604 }
605
606 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
607 {
608 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
609 struct jffs2_xattr_datum *xd;
610 struct jffs2_xattr_ref *ref, *_ref;
611
612 down_write(&c->xattr_sem);
613 for (ref = ic->xref; ref; ref = _ref) {
614 _ref = ref->next;
615 xd = ref->xd;
616 if (atomic_dec_and_test(&xd->refcnt)) {
617 unload_xattr_datum(c, xd);
618 jffs2_free_xattr_datum(xd);
619 }
620 jffs2_free_xattr_ref(ref);
621 }
622 ic->xref = NULL;
623 up_write(&c->xattr_sem);
624 }
625
626 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
627 {
628 /* success of check_xattr_ref_inode() means taht inode (ic) dose not have
629 * duplicate name/value pairs. If duplicate name/value pair would be found,
630 * one will be removed.
631 */
632 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
633 int rc = 0;
634
635 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
636 return 0;
637 down_write(&c->xattr_sem);
638 retry:
639 rc = 0;
640 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
641 if (!ref->xd->xname) {
642 rc = load_xattr_datum(c, ref->xd);
643 if (unlikely(rc > 0)) {
644 *pref = ref->next;
645 delete_xattr_ref(c, ref);
646 goto retry;
647 } else if (unlikely(rc < 0))
648 goto out;
649 }
650 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
651 if (!cmp->xd->xname) {
652 ref->xd->flags |= JFFS2_XFLAGS_BIND;
653 rc = load_xattr_datum(c, cmp->xd);
654 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
655 if (unlikely(rc > 0)) {
656 *pcmp = cmp->next;
657 delete_xattr_ref(c, cmp);
658 goto retry;
659 } else if (unlikely(rc < 0))
660 goto out;
661 }
662 if (ref->xd->xprefix == cmp->xd->xprefix
663 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
664 if (ref->xseqno > cmp->xseqno) {
665 *pcmp = cmp->next;
666 delete_xattr_ref(c, cmp);
667 } else {
668 *pref = ref->next;
669 delete_xattr_ref(c, ref);
670 }
671 goto retry;
672 }
673 }
674 }
675 ic->flags |= INO_FLAGS_XATTR_CHECKED;
676 out:
677 up_write(&c->xattr_sem);
678
679 return rc;
680 }
681
682 /* -------- xattr subsystem functions ---------------
683 * jffs2_init_xattr_subsystem(c)
684 * is used to initialize semaphore and list_head, and some variables.
685 * jffs2_find_xattr_datum(c, xid)
686 * is used to lookup xdatum while scanning process.
687 * jffs2_clear_xattr_subsystem(c)
688 * is used to release any xattr related objects.
689 * jffs2_build_xattr_subsystem(c)
690 * is used to associate xdatum and xref while super block building process.
691 * jffs2_setup_xattr_datum(c, xid, version)
692 * is used to insert xdatum while scanning process.
693 * -------------------------------------------------- */
694 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
695 {
696 int i;
697
698 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
699 INIT_LIST_HEAD(&c->xattrindex[i]);
700 INIT_LIST_HEAD(&c->xattr_unchecked);
701 INIT_LIST_HEAD(&c->xattr_dead_list);
702 c->xref_dead_list = NULL;
703 c->xref_temp = NULL;
704
705 init_rwsem(&c->xattr_sem);
706 c->highest_xid = 0;
707 c->highest_xseqno = 0;
708 c->xdatum_mem_usage = 0;
709 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
710 }
711
712 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
713 {
714 struct jffs2_xattr_datum *xd;
715 int i = xid % XATTRINDEX_HASHSIZE;
716
717 /* It's only used in scanning/building process. */
718 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
719
720 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
721 if (xd->xid==xid)
722 return xd;
723 }
724 return NULL;
725 }
726
727 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
728 {
729 struct jffs2_xattr_datum *xd, *_xd;
730 struct jffs2_xattr_ref *ref, *_ref;
731 int i;
732
733 for (ref=c->xref_temp; ref; ref = _ref) {
734 _ref = ref->next;
735 jffs2_free_xattr_ref(ref);
736 }
737
738 for (ref=c->xref_dead_list; ref; ref = _ref) {
739 _ref = ref->next;
740 jffs2_free_xattr_ref(ref);
741 }
742
743 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
744 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
745 list_del(&xd->xindex);
746 if (xd->xname)
747 kfree(xd->xname);
748 jffs2_free_xattr_datum(xd);
749 }
750 }
751
752 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
753 list_del(&xd->xindex);
754 jffs2_free_xattr_datum(xd);
755 }
756 }
757
758 #define XREF_TMPHASH_SIZE (128)
759 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
760 {
761 struct jffs2_xattr_ref *ref, *_ref;
762 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
763 struct jffs2_xattr_datum *xd, *_xd;
764 struct jffs2_inode_cache *ic;
765 struct jffs2_raw_node_ref *raw;
766 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
767 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0;
768
769 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
770
771 /* Phase.1 : Merge same xref */
772 for (i=0; i < XREF_TMPHASH_SIZE; i++)
773 xref_tmphash[i] = NULL;
774 for (ref=c->xref_temp; ref; ref=_ref) {
775 struct jffs2_xattr_ref *tmp;
776
777 _ref = ref->next;
778 if (ref_flags(ref->node) != REF_PRISTINE) {
779 if (verify_xattr_ref(c, ref)) {
780 BUG_ON(ref->node->next_in_ino != (void *)ref);
781 ref->node->next_in_ino = NULL;
782 jffs2_mark_node_obsolete(c, ref->node);
783 jffs2_free_xattr_ref(ref);
784 continue;
785 }
786 }
787
788 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
789 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
790 if (tmp->ino == ref->ino && tmp->xid == ref->xid)
791 break;
792 }
793 if (tmp) {
794 raw = ref->node;
795 if (ref->xseqno > tmp->xseqno) {
796 tmp->xseqno = ref->xseqno;
797 raw->next_in_ino = tmp->node;
798 tmp->node = raw;
799 } else {
800 raw->next_in_ino = tmp->node->next_in_ino;
801 tmp->node->next_in_ino = raw;
802 }
803 jffs2_free_xattr_ref(ref);
804 continue;
805 } else {
806 ref->next = xref_tmphash[i];
807 xref_tmphash[i] = ref;
808 }
809 }
810 c->xref_temp = NULL;
811
812 /* Phase.2 : Bind xref with inode_cache and xattr_datum */
813 for (i=0; i < XREF_TMPHASH_SIZE; i++) {
814 for (ref=xref_tmphash[i]; ref; ref=_ref) {
815 xref_count++;
816 _ref = ref->next;
817 if (is_xattr_ref_dead(ref)) {
818 ref->next = c->xref_dead_list;
819 c->xref_dead_list = ref;
820 xref_dead_count++;
821 continue;
822 }
823 /* At this point, ref->xid and ref->ino contain XID and inode number.
824 ref->xd and ref->ic are not valid yet. */
825 xd = jffs2_find_xattr_datum(c, ref->xid);
826 ic = jffs2_get_ino_cache(c, ref->ino);
827 if (!xd || !ic) {
828 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n",
829 ref->ino, ref->xid, ref->xseqno);
830 ref->xseqno |= XREF_DELETE_MARKER;
831 ref->next = c->xref_dead_list;
832 c->xref_dead_list = ref;
833 xref_orphan_count++;
834 continue;
835 }
836 ref->xd = xd;
837 ref->ic = ic;
838 atomic_inc(&xd->refcnt);
839 ref->next = ic->xref;
840 ic->xref = ref;
841 }
842 }
843
844 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */
845 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
846 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
847 xdatum_count++;
848 list_del_init(&xd->xindex);
849 if (!atomic_read(&xd->refcnt)) {
850 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n",
851 xd->xid, xd->version);
852 xd->flags |= JFFS2_XFLAGS_DEAD;
853 list_add(&xd->xindex, &c->xattr_unchecked);
854 xdatum_orphan_count++;
855 continue;
856 }
857 if (is_xattr_datum_unchecked(c, xd)) {
858 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
859 xd->xid, xd->version);
860 list_add(&xd->xindex, &c->xattr_unchecked);
861 xdatum_unchecked_count++;
862 }
863 }
864 }
865 /* build complete */
866 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum"
867 " (%u unchecked, %u orphan) and "
868 "%u of xref (%u dead, %u orphan) found.\n",
869 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
870 xref_count, xref_dead_count, xref_orphan_count);
871 }
872
873 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
874 uint32_t xid, uint32_t version)
875 {
876 struct jffs2_xattr_datum *xd;
877
878 xd = jffs2_find_xattr_datum(c, xid);
879 if (!xd) {
880 xd = jffs2_alloc_xattr_datum();
881 if (!xd)
882 return ERR_PTR(-ENOMEM);
883 xd->xid = xid;
884 xd->version = version;
885 if (xd->xid > c->highest_xid)
886 c->highest_xid = xd->xid;
887 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
888 }
889 return xd;
890 }
891
892 /* -------- xattr subsystem functions ---------------
893 * xprefix_to_handler(xprefix)
894 * is used to translate xprefix into xattr_handler.
895 * jffs2_listxattr(dentry, buffer, size)
896 * is an implementation of listxattr handler on jffs2.
897 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
898 * is an implementation of getxattr handler on jffs2.
899 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
900 * is an implementation of setxattr handler on jffs2.
901 * -------------------------------------------------- */
902 struct xattr_handler *jffs2_xattr_handlers[] = {
903 &jffs2_user_xattr_handler,
904 #ifdef CONFIG_JFFS2_FS_SECURITY
905 &jffs2_security_xattr_handler,
906 #endif
907 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
908 &jffs2_acl_access_xattr_handler,
909 &jffs2_acl_default_xattr_handler,
910 #endif
911 &jffs2_trusted_xattr_handler,
912 NULL
913 };
914
915 static struct xattr_handler *xprefix_to_handler(int xprefix) {
916 struct xattr_handler *ret;
917
918 switch (xprefix) {
919 case JFFS2_XPREFIX_USER:
920 ret = &jffs2_user_xattr_handler;
921 break;
922 #ifdef CONFIG_JFFS2_FS_SECURITY
923 case JFFS2_XPREFIX_SECURITY:
924 ret = &jffs2_security_xattr_handler;
925 break;
926 #endif
927 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
928 case JFFS2_XPREFIX_ACL_ACCESS:
929 ret = &jffs2_acl_access_xattr_handler;
930 break;
931 case JFFS2_XPREFIX_ACL_DEFAULT:
932 ret = &jffs2_acl_default_xattr_handler;
933 break;
934 #endif
935 case JFFS2_XPREFIX_TRUSTED:
936 ret = &jffs2_trusted_xattr_handler;
937 break;
938 default:
939 ret = NULL;
940 break;
941 }
942 return ret;
943 }
944
945 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
946 {
947 struct inode *inode = dentry->d_inode;
948 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
949 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
950 struct jffs2_inode_cache *ic = f->inocache;
951 struct jffs2_xattr_ref *ref, **pref;
952 struct jffs2_xattr_datum *xd;
953 struct xattr_handler *xhandle;
954 ssize_t len, rc;
955 int retry = 0;
956
957 rc = check_xattr_ref_inode(c, ic);
958 if (unlikely(rc))
959 return rc;
960
961 down_read(&c->xattr_sem);
962 retry:
963 len = 0;
964 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
965 BUG_ON(ref->ic != ic);
966 xd = ref->xd;
967 if (!xd->xname) {
968 /* xdatum is unchached */
969 if (!retry) {
970 retry = 1;
971 up_read(&c->xattr_sem);
972 down_write(&c->xattr_sem);
973 goto retry;
974 } else {
975 rc = load_xattr_datum(c, xd);
976 if (unlikely(rc > 0)) {
977 *pref = ref->next;
978 delete_xattr_ref(c, ref);
979 goto retry;
980 } else if (unlikely(rc < 0))
981 goto out;
982 }
983 }
984 xhandle = xprefix_to_handler(xd->xprefix);
985 if (!xhandle)
986 continue;
987 if (buffer) {
988 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
989 } else {
990 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
991 }
992 if (rc < 0)
993 goto out;
994 len += rc;
995 }
996 rc = len;
997 out:
998 if (!retry) {
999 up_read(&c->xattr_sem);
1000 } else {
1001 up_write(&c->xattr_sem);
1002 }
1003 return rc;
1004 }
1005
1006 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
1007 char *buffer, size_t size)
1008 {
1009 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1010 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1011 struct jffs2_inode_cache *ic = f->inocache;
1012 struct jffs2_xattr_datum *xd;
1013 struct jffs2_xattr_ref *ref, **pref;
1014 int rc, retry = 0;
1015
1016 rc = check_xattr_ref_inode(c, ic);
1017 if (unlikely(rc))
1018 return rc;
1019
1020 down_read(&c->xattr_sem);
1021 retry:
1022 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1023 BUG_ON(ref->ic!=ic);
1024
1025 xd = ref->xd;
1026 if (xd->xprefix != xprefix)
1027 continue;
1028 if (!xd->xname) {
1029 /* xdatum is unchached */
1030 if (!retry) {
1031 retry = 1;
1032 up_read(&c->xattr_sem);
1033 down_write(&c->xattr_sem);
1034 goto retry;
1035 } else {
1036 rc = load_xattr_datum(c, xd);
1037 if (unlikely(rc > 0)) {
1038 *pref = ref->next;
1039 delete_xattr_ref(c, ref);
1040 goto retry;
1041 } else if (unlikely(rc < 0)) {
1042 goto out;
1043 }
1044 }
1045 }
1046 if (!strcmp(xname, xd->xname)) {
1047 rc = xd->value_len;
1048 if (buffer) {
1049 if (size < rc) {
1050 rc = -ERANGE;
1051 } else {
1052 memcpy(buffer, xd->xvalue, rc);
1053 }
1054 }
1055 goto out;
1056 }
1057 }
1058 rc = -ENODATA;
1059 out:
1060 if (!retry) {
1061 up_read(&c->xattr_sem);
1062 } else {
1063 up_write(&c->xattr_sem);
1064 }
1065 return rc;
1066 }
1067
1068 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1069 const char *buffer, size_t size, int flags)
1070 {
1071 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1072 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1073 struct jffs2_inode_cache *ic = f->inocache;
1074 struct jffs2_xattr_datum *xd;
1075 struct jffs2_xattr_ref *ref, *newref, **pref;
1076 uint32_t length, request;
1077 int rc;
1078
1079 rc = check_xattr_ref_inode(c, ic);
1080 if (unlikely(rc))
1081 return rc;
1082
1083 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1084 rc = jffs2_reserve_space(c, request, &length,
1085 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1086 if (rc) {
1087 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1088 return rc;
1089 }
1090
1091 /* Find existing xattr */
1092 down_write(&c->xattr_sem);
1093 retry:
1094 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1095 xd = ref->xd;
1096 if (xd->xprefix != xprefix)
1097 continue;
1098 if (!xd->xname) {
1099 rc = load_xattr_datum(c, xd);
1100 if (unlikely(rc > 0)) {
1101 *pref = ref->next;
1102 delete_xattr_ref(c, ref);
1103 goto retry;
1104 } else if (unlikely(rc < 0))
1105 goto out;
1106 }
1107 if (!strcmp(xd->xname, xname)) {
1108 if (flags & XATTR_CREATE) {
1109 rc = -EEXIST;
1110 goto out;
1111 }
1112 if (!buffer) {
1113 ref->ino = ic->ino;
1114 ref->xid = xd->xid;
1115 ref->xseqno |= XREF_DELETE_MARKER;
1116 rc = save_xattr_ref(c, ref);
1117 if (!rc) {
1118 *pref = ref->next;
1119 spin_lock(&c->erase_completion_lock);
1120 ref->next = c->xref_dead_list;
1121 c->xref_dead_list = ref;
1122 spin_unlock(&c->erase_completion_lock);
1123 unrefer_xattr_datum(c, xd);
1124 } else {
1125 ref->ic = ic;
1126 ref->xd = xd;
1127 ref->xseqno &= ~XREF_DELETE_MARKER;
1128 }
1129 goto out;
1130 }
1131 goto found;
1132 }
1133 }
1134 /* not found */
1135 if (flags & XATTR_REPLACE) {
1136 rc = -ENODATA;
1137 goto out;
1138 }
1139 if (!buffer) {
1140 rc = -ENODATA;
1141 goto out;
1142 }
1143 found:
1144 xd = create_xattr_datum(c, xprefix, xname, buffer, size);
1145 if (IS_ERR(xd)) {
1146 rc = PTR_ERR(xd);
1147 goto out;
1148 }
1149 up_write(&c->xattr_sem);
1150 jffs2_complete_reservation(c);
1151
1152 /* create xattr_ref */
1153 request = PAD(sizeof(struct jffs2_raw_xref));
1154 rc = jffs2_reserve_space(c, request, &length,
1155 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
1156 down_write(&c->xattr_sem);
1157 if (rc) {
1158 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1159 unrefer_xattr_datum(c, xd);
1160 up_write(&c->xattr_sem);
1161 return rc;
1162 }
1163 if (ref)
1164 *pref = ref->next;
1165 newref = create_xattr_ref(c, ic, xd);
1166 if (IS_ERR(newref)) {
1167 if (ref) {
1168 ref->next = ic->xref;
1169 ic->xref = ref;
1170 }
1171 rc = PTR_ERR(newref);
1172 unrefer_xattr_datum(c, xd);
1173 } else if (ref) {
1174 delete_xattr_ref(c, ref);
1175 }
1176 out:
1177 up_write(&c->xattr_sem);
1178 jffs2_complete_reservation(c);
1179 return rc;
1180 }
1181
1182 /* -------- garbage collector functions -------------
1183 * jffs2_garbage_collect_xattr_datum(c, xd, raw)
1184 * is used to move xdatum into new node.
1185 * jffs2_garbage_collect_xattr_ref(c, ref, raw)
1186 * is used to move xref into new node.
1187 * jffs2_verify_xattr(c)
1188 * is used to call do_verify_xattr_datum() before garbage collecting.
1189 * jffs2_release_xattr_datum(c, xd)
1190 * is used to release an in-memory object of xdatum.
1191 * jffs2_release_xattr_ref(c, ref)
1192 * is used to release an in-memory object of xref.
1193 * -------------------------------------------------- */
1194 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
1195 struct jffs2_raw_node_ref *raw)
1196 {
1197 uint32_t totlen, length, old_ofs;
1198 int rc = 0;
1199
1200 down_write(&c->xattr_sem);
1201 if (xd->node != raw)
1202 goto out;
1203 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
1204 goto out;
1205
1206 rc = load_xattr_datum(c, xd);
1207 if (unlikely(rc)) {
1208 rc = (rc > 0) ? 0 : rc;
1209 goto out;
1210 }
1211 old_ofs = ref_offset(xd->node);
1212 totlen = PAD(sizeof(struct jffs2_raw_xattr)
1213 + xd->name_len + 1 + xd->value_len);
1214 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
1215 if (rc) {
1216 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
1217 goto out;
1218 }
1219 rc = save_xattr_datum(c, xd);
1220 if (!rc)
1221 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1222 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1223 out:
1224 if (!rc)
1225 jffs2_mark_node_obsolete(c, raw);
1226 up_write(&c->xattr_sem);
1227 return rc;
1228 }
1229
1230 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
1231 struct jffs2_raw_node_ref *raw)
1232 {
1233 uint32_t totlen, length, old_ofs;
1234 int rc = 0;
1235
1236 down_write(&c->xattr_sem);
1237 BUG_ON(!ref->node);
1238
1239 if (ref->node != raw)
1240 goto out;
1241 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
1242 goto out;
1243
1244 old_ofs = ref_offset(ref->node);
1245 totlen = ref_totlen(c, c->gcblock, ref->node);
1246
1247 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
1248 if (rc) {
1249 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
1250 __FUNCTION__, rc, totlen);
1251 rc = rc ? rc : -EBADFD;
1252 goto out;
1253 }
1254 rc = save_xattr_ref(c, ref);
1255 if (!rc)
1256 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1257 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1258 out:
1259 if (!rc)
1260 jffs2_mark_node_obsolete(c, raw);
1261 up_write(&c->xattr_sem);
1262 return rc;
1263 }
1264
1265 int jffs2_verify_xattr(struct jffs2_sb_info *c)
1266 {
1267 struct jffs2_xattr_datum *xd, *_xd;
1268 struct jffs2_eraseblock *jeb;
1269 struct jffs2_raw_node_ref *raw;
1270 uint32_t totlen;
1271 int rc;
1272
1273 down_write(&c->xattr_sem);
1274 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1275 rc = do_verify_xattr_datum(c, xd);
1276 if (rc < 0)
1277 continue;
1278 list_del_init(&xd->xindex);
1279 spin_lock(&c->erase_completion_lock);
1280 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
1281 if (ref_flags(raw) != REF_UNCHECKED)
1282 continue;
1283 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
1284 totlen = PAD(ref_totlen(c, jeb, raw));
1285 c->unchecked_size -= totlen; c->used_size += totlen;
1286 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
1287 raw->flash_offset = ref_offset(raw)
1288 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
1289 }
1290 if (xd->flags & JFFS2_XFLAGS_DEAD)
1291 list_add(&xd->xindex, &c->xattr_dead_list);
1292 spin_unlock(&c->erase_completion_lock);
1293 }
1294 up_write(&c->xattr_sem);
1295 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1296 }
1297
1298 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
1299 {
1300 /* must be called under spin_lock(&c->erase_completion_lock) */
1301 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd)
1302 return;
1303
1304 list_del(&xd->xindex);
1305 jffs2_free_xattr_datum(xd);
1306 }
1307
1308 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
1309 {
1310 /* must be called under spin_lock(&c->erase_completion_lock) */
1311 struct jffs2_xattr_ref *tmp, **ptmp;
1312
1313 if (ref->node != (void *)ref)
1314 return;
1315
1316 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
1317 if (ref == tmp) {
1318 *ptmp = tmp->next;
1319 break;
1320 }
1321 }
1322 jffs2_free_xattr_ref(ref);
1323 }
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