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smsc95xx: fix suspend buffer overflow
[linux-2.6/cjktty.git] / fs / jffs2 / xattr.c
blob3034e970eb9a130cea79d7d413aa2463070408ff
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 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
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #define JFFS2_XATTR_IS_CORRUPTED 1
15
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/fs.h>
19 #include <linux/time.h>
20 #include <linux/pagemap.h>
21 #include <linux/highmem.h>
22 #include <linux/crc32.h>
23 #include <linux/jffs2.h>
24 #include <linux/xattr.h>
25 #include <linux/mtd/mtd.h>
26 #include "nodelist.h"
27 /* -------- xdatum related functions ----------------
28 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize)
29 * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is
30 * the index of the xattr name/value pair cache (c->xattrindex).
31 * is_xattr_datum_unchecked(c, xd)
32 * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not
33 * unchecked, it returns 0.
34 * unload_xattr_datum(c, xd)
35 * is used to release xattr name/value pair and detach from c->xattrindex.
36 * reclaim_xattr_datum(c)
37 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when
38 * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold
39 * is hard coded as 32KiB.
40 * do_verify_xattr_datum(c, xd)
41 * is used to load the xdatum informations without name/value pair from the medium.
42 * It's necessary once, because those informations are not collected during mounting
43 * process when EBS is enabled.
44 * 0 will be returned, if success. An negative return value means recoverable error, and
45 * positive return value means unrecoverable error. Thus, caller must remove this xdatum
46 * and xref when it returned positive value.
47 * do_load_xattr_datum(c, xd)
48 * is used to load name/value pair from the medium.
49 * The meanings of return value is same as do_verify_xattr_datum().
50 * load_xattr_datum(c, xd)
51 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum().
52 * If xd need to call do_verify_xattr_datum() at first, it's called before calling
53 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum().
54 * save_xattr_datum(c, xd)
55 * is used to write xdatum to medium. xd->version will be incremented.
56 * create_xattr_datum(c, xprefix, xname, xvalue, xsize)
57 * is used to create new xdatum and write to medium.
58 * unrefer_xattr_datum(c, xd)
59 * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD
60 * is set on xd->flags and chained xattr_dead_list or release it immediately.
61 * In the first case, the garbage collector release it later.
62 * -------------------------------------------------- */
63 static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)
64 {
65 int name_len = strlen(xname);
66
67 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize);
68 }
69
70 static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
71 {
72 struct jffs2_raw_node_ref *raw;
73 int rc = 0;
74
75 spin_lock(&c->erase_completion_lock);
76 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
77 if (ref_flags(raw) == REF_UNCHECKED) {
78 rc = 1;
79 break;
80 }
81 }
82 spin_unlock(&c->erase_completion_lock);
83 return rc;
84 }
85
86 static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
87 {
88 /* must be called under down_write(xattr_sem) */
89 D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version));
90 if (xd->xname) {
91 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);
92 kfree(xd->xname);
93 }
94
95 list_del_init(&xd->xindex);
96 xd->hashkey = 0;
97 xd->xname = NULL;
98 xd->xvalue = NULL;
99 }
100
101 static void reclaim_xattr_datum(struct jffs2_sb_info *c)
102 {
103 /* must be called under down_write(xattr_sem) */
104 struct jffs2_xattr_datum *xd, *_xd;
105 uint32_t target, before;
106 static int index = 0;
107 int count;
108
109 if (c->xdatum_mem_threshold > c->xdatum_mem_usage)
110 return;
111
112 before = c->xdatum_mem_usage;
113 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */
114 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {
115 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {
116 if (xd->flags & JFFS2_XFLAGS_HOT) {
117 xd->flags &= ~JFFS2_XFLAGS_HOT;
118 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {
119 unload_xattr_datum(c, xd);
120 }
121 if (c->xdatum_mem_usage <= target)
122 goto out;
123 }
124 index = (index+1) % XATTRINDEX_HASHSIZE;
125 }
126 out:
127 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",
128 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
129 }
130
131 static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
132 {
133 /* must be called under down_write(xattr_sem) */
134 struct jffs2_eraseblock *jeb;
135 struct jffs2_raw_node_ref *raw;
136 struct jffs2_raw_xattr rx;
137 size_t readlen;
138 uint32_t crc, offset, totlen;
139 int rc;
140
141 spin_lock(&c->erase_completion_lock);
142 offset = ref_offset(xd->node);
143 if (ref_flags(xd->node) == REF_PRISTINE)
144 goto complete;
145 spin_unlock(&c->erase_completion_lock);
146
147 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx);
148 if (rc || readlen != sizeof(rx)) {
149 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
150 rc, sizeof(rx), readlen, offset);
151 return rc ? rc : -EIO;
152 }
153 crc = crc32(0, &rx, sizeof(rx) - 4);
154 if (crc != je32_to_cpu(rx.node_crc)) {
155 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
156 offset, je32_to_cpu(rx.hdr_crc), crc);
157 xd->flags |= JFFS2_XFLAGS_INVALID;
158 return JFFS2_XATTR_IS_CORRUPTED;
159 }
160 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len));
161 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK
162 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR
163 || je32_to_cpu(rx.totlen) != totlen
164 || je32_to_cpu(rx.xid) != xd->xid
165 || je32_to_cpu(rx.version) != xd->version) {
166 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "
167 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",
168 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
169 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,
170 je32_to_cpu(rx.totlen), totlen,
171 je32_to_cpu(rx.xid), xd->xid,
172 je32_to_cpu(rx.version), xd->version);
173 xd->flags |= JFFS2_XFLAGS_INVALID;
174 return JFFS2_XATTR_IS_CORRUPTED;
175 }
176 xd->xprefix = rx.xprefix;
177 xd->name_len = rx.name_len;
178 xd->value_len = je16_to_cpu(rx.value_len);
179 xd->data_crc = je32_to_cpu(rx.data_crc);
180
181 spin_lock(&c->erase_completion_lock);
182 complete:
183 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
184 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
185 totlen = PAD(ref_totlen(c, jeb, raw));
186 if (ref_flags(raw) == REF_UNCHECKED) {
187 c->unchecked_size -= totlen; c->used_size += totlen;
188 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
189 }
190 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL);
191 }
192 spin_unlock(&c->erase_completion_lock);
193
194 /* unchecked xdatum is chained with c->xattr_unchecked */
195 list_del_init(&xd->xindex);
196
197 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",
198 xd->xid, xd->version);
199
200 return 0;
201 }
202
203 static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
204 {
205 /* must be called under down_write(xattr_sem) */
206 char *data;
207 size_t readlen;
208 uint32_t crc, length;
209 int i, ret, retry = 0;
210
211 BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
212 BUG_ON(!list_empty(&xd->xindex));
213 retry:
214 length = xd->name_len + 1 + xd->value_len;
215 data = kmalloc(length, GFP_KERNEL);
216 if (!data)
217 return -ENOMEM;
218
219 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),
220 length, &readlen, data);
221
222 if (ret || length!=readlen) {
223 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n",
224 ret, length, readlen, ref_offset(xd->node));
225 kfree(data);
226 return ret ? ret : -EIO;
227 }
228
229 data[xd->name_len] = '\0';
230 crc = crc32(0, data, length);
231 if (crc != xd->data_crc) {
232 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XATTR)"
233 " at %#08x, read: 0x%08x calculated: 0x%08x\n",
234 ref_offset(xd->node), xd->data_crc, crc);
235 kfree(data);
236 xd->flags |= JFFS2_XFLAGS_INVALID;
237 return JFFS2_XATTR_IS_CORRUPTED;
238 }
239
240 xd->flags |= JFFS2_XFLAGS_HOT;
241 xd->xname = data;
242 xd->xvalue = data + xd->name_len+1;
243
244 c->xdatum_mem_usage += length;
245
246 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);
247 i = xd->hashkey % XATTRINDEX_HASHSIZE;
248 list_add(&xd->xindex, &c->xattrindex[i]);
249 if (!retry) {
250 retry = 1;
251 reclaim_xattr_datum(c);
252 if (!xd->xname)
253 goto retry;
254 }
255
256 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",
257 xd->xid, xd->xprefix, xd->xname);
258
259 return 0;
260 }
261
262 static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
263 {
264 /* must be called under down_write(xattr_sem);
265 * rc < 0 : recoverable error, try again
266 * rc = 0 : success
267 * rc > 0 : Unrecoverable error, this node should be deleted.
268 */
269 int rc = 0;
270
271 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);
272 if (xd->xname)
273 return 0;
274 if (xd->flags & JFFS2_XFLAGS_INVALID)
275 return JFFS2_XATTR_IS_CORRUPTED;
276 if (unlikely(is_xattr_datum_unchecked(c, xd)))
277 rc = do_verify_xattr_datum(c, xd);
278 if (!rc)
279 rc = do_load_xattr_datum(c, xd);
280 return rc;
281 }
282
283 static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
284 {
285 /* must be called under down_write(xattr_sem) */
286 struct jffs2_raw_xattr rx;
287 struct kvec vecs[2];
288 size_t length;
289 int rc, totlen;
290 uint32_t phys_ofs = write_ofs(c);
291
292 BUG_ON(!xd->xname);
293 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID));
294
295 vecs[0].iov_base = &rx;
296 vecs[0].iov_len = sizeof(rx);
297 vecs[1].iov_base = xd->xname;
298 vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
299 totlen = vecs[0].iov_len + vecs[1].iov_len;
300
301 /* Setup raw-xattr */
302 memset(&rx, 0, sizeof(rx));
303 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
304 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
305 rx.totlen = cpu_to_je32(PAD(totlen));
306 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
307
308 rx.xid = cpu_to_je32(xd->xid);
309 rx.version = cpu_to_je32(++xd->version);
310 rx.xprefix = xd->xprefix;
311 rx.name_len = xd->name_len;
312 rx.value_len = cpu_to_je16(xd->value_len);
313 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
314 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
315
316 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);
317 if (rc || totlen != length) {
318 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",
319 rc, totlen, length, phys_ofs);
320 rc = rc ? rc : -EIO;
321 if (length)
322 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);
323
324 return rc;
325 }
326 /* success */
327 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd);
328
329 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
330 xd->xid, xd->version, xd->xprefix, xd->xname);
331
332 return 0;
333 }
334
335 static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
336 int xprefix, const char *xname,
337 const char *xvalue, int xsize)
338 {
339 /* must be called under down_write(xattr_sem) */
340 struct jffs2_xattr_datum *xd;
341 uint32_t hashkey, name_len;
342 char *data;
343 int i, rc;
344
345 /* Search xattr_datum has same xname/xvalue by index */
346 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
347 i = hashkey % XATTRINDEX_HASHSIZE;
348 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
349 if (xd->hashkey==hashkey
350 && xd->xprefix==xprefix
351 && xd->value_len==xsize
352 && !strcmp(xd->xname, xname)
353 && !memcmp(xd->xvalue, xvalue, xsize)) {
354 atomic_inc(&xd->refcnt);
355 return xd;
356 }
357 }
358
359 /* Not found, Create NEW XATTR-Cache */
360 name_len = strlen(xname);
361
362 xd = jffs2_alloc_xattr_datum();
363 if (!xd)
364 return ERR_PTR(-ENOMEM);
365
366 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
367 if (!data) {
368 jffs2_free_xattr_datum(xd);
369 return ERR_PTR(-ENOMEM);
370 }
371 strcpy(data, xname);
372 memcpy(data + name_len + 1, xvalue, xsize);
373
374 atomic_set(&xd->refcnt, 1);
375 xd->xid = ++c->highest_xid;
376 xd->flags |= JFFS2_XFLAGS_HOT;
377 xd->xprefix = xprefix;
378
379 xd->hashkey = hashkey;
380 xd->xname = data;
381 xd->xvalue = data + name_len + 1;
382 xd->name_len = name_len;
383 xd->value_len = xsize;
384 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
385
386 rc = save_xattr_datum(c, xd);
387 if (rc) {
388 kfree(xd->xname);
389 jffs2_free_xattr_datum(xd);
390 return ERR_PTR(rc);
391 }
392
393 /* Insert Hash Index */
394 i = hashkey % XATTRINDEX_HASHSIZE;
395 list_add(&xd->xindex, &c->xattrindex[i]);
396
397 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
398 reclaim_xattr_datum(c);
399
400 return xd;
401 }
402
403 static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
404 {
405 /* must be called under down_write(xattr_sem) */
406 if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) {
407 unload_xattr_datum(c, xd);
408 xd->flags |= JFFS2_XFLAGS_DEAD;
409 if (xd->node == (void *)xd) {
410 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID));
411 jffs2_free_xattr_datum(xd);
412 } else {
413 list_add(&xd->xindex, &c->xattr_dead_list);
414 }
415 spin_unlock(&c->erase_completion_lock);
416
417 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n",
418 xd->xid, xd->version);
419 }
420 }
421
422 /* -------- xref related functions ------------------
423 * verify_xattr_ref(c, ref)
424 * is used to load xref information from medium. Because summary data does not
425 * contain xid/ino, it's necessary to verify once while mounting process.
426 * save_xattr_ref(c, ref)
427 * is used to write xref to medium. If delete marker is marked, it write
428 * a delete marker of xref into medium.
429 * create_xattr_ref(c, ic, xd)
430 * is used to create a new xref and write to medium.
431 * delete_xattr_ref(c, ref)
432 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER,
433 * and allows GC to reclaim those physical nodes.
434 * jffs2_xattr_delete_inode(c, ic)
435 * is called to remove xrefs related to obsolete inode when inode is unlinked.
436 * jffs2_xattr_free_inode(c, ic)
437 * is called to release xattr related objects when unmounting.
438 * check_xattr_ref_inode(c, ic)
439 * is used to confirm inode does not have duplicate xattr name/value pair.
440 * jffs2_xattr_do_crccheck_inode(c, ic)
441 * is used to force xattr data integrity check during the initial gc scan.
442 * -------------------------------------------------- */
443 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
444 {
445 struct jffs2_eraseblock *jeb;
446 struct jffs2_raw_node_ref *raw;
447 struct jffs2_raw_xref rr;
448 size_t readlen;
449 uint32_t crc, offset, totlen;
450 int rc;
451
452 spin_lock(&c->erase_completion_lock);
453 if (ref_flags(ref->node) != REF_UNCHECKED)
454 goto complete;
455 offset = ref_offset(ref->node);
456 spin_unlock(&c->erase_completion_lock);
457
458 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);
459 if (rc || sizeof(rr) != readlen) {
460 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
461 rc, sizeof(rr), readlen, offset);
462 return rc ? rc : -EIO;
463 }
464 /* obsolete node */
465 crc = crc32(0, &rr, sizeof(rr) - 4);
466 if (crc != je32_to_cpu(rr.node_crc)) {
467 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
468 offset, je32_to_cpu(rr.node_crc), crc);
469 return JFFS2_XATTR_IS_CORRUPTED;
470 }
471 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
472 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
473 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
474 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
475 "nodetype=%#04x/%#04x, totlen=%u/%zu\n",
476 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
477 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
478 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
479 return JFFS2_XATTR_IS_CORRUPTED;
480 }
481 ref->ino = je32_to_cpu(rr.ino);
482 ref->xid = je32_to_cpu(rr.xid);
483 ref->xseqno = je32_to_cpu(rr.xseqno);
484 if (ref->xseqno > c->highest_xseqno)
485 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
486
487 spin_lock(&c->erase_completion_lock);
488 complete:
489 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {
490 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
491 totlen = PAD(ref_totlen(c, jeb, raw));
492 if (ref_flags(raw) == REF_UNCHECKED) {
493 c->unchecked_size -= totlen; c->used_size += totlen;
494 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
495 }
496 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);
497 }
498 spin_unlock(&c->erase_completion_lock);
499
500 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
501 ref->ino, ref->xid, ref_offset(ref->node));
502 return 0;
503 }
504
505 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
506 {
507 /* must be called under down_write(xattr_sem) */
508 struct jffs2_raw_xref rr;
509 size_t length;
510 uint32_t xseqno, phys_ofs = write_ofs(c);
511 int ret;
512
513 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
514 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
515 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
516 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
517
518 xseqno = (c->highest_xseqno += 2);
519 if (is_xattr_ref_dead(ref)) {
520 xseqno |= XREF_DELETE_MARKER;
521 rr.ino = cpu_to_je32(ref->ino);
522 rr.xid = cpu_to_je32(ref->xid);
523 } else {
524 rr.ino = cpu_to_je32(ref->ic->ino);
525 rr.xid = cpu_to_je32(ref->xd->xid);
526 }
527 rr.xseqno = cpu_to_je32(xseqno);
528 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
529
530 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
531 if (ret || sizeof(rr) != length) {
532 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
533 ret, sizeof(rr), length, phys_ofs);
534 ret = ret ? ret : -EIO;
535 if (length)
536 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
537
538 return ret;
539 }
540 /* success */
541 ref->xseqno = xseqno;
542 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);
543
544 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
545
546 return 0;
547 }
548
549 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
550 struct jffs2_xattr_datum *xd)
551 {
552 /* must be called under down_write(xattr_sem) */
553 struct jffs2_xattr_ref *ref;
554 int ret;
555
556 ref = jffs2_alloc_xattr_ref();
557 if (!ref)
558 return ERR_PTR(-ENOMEM);
559 ref->ic = ic;
560 ref->xd = xd;
561
562 ret = save_xattr_ref(c, ref);
563 if (ret) {
564 jffs2_free_xattr_ref(ref);
565 return ERR_PTR(ret);
566 }
567
568 /* Chain to inode */
569 ref->next = ic->xref;
570 ic->xref = ref;
571
572 return ref; /* success */
573 }
574
575 static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
576 {
577 /* must be called under down_write(xattr_sem) */
578 struct jffs2_xattr_datum *xd;
579
580 xd = ref->xd;
581 ref->xseqno |= XREF_DELETE_MARKER;
582 ref->ino = ref->ic->ino;
583 ref->xid = ref->xd->xid;
584 spin_lock(&c->erase_completion_lock);
585 ref->next = c->xref_dead_list;
586 c->xref_dead_list = ref;
587 spin_unlock(&c->erase_completion_lock);
588
589 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
590 ref->ino, ref->xid, ref->xseqno);
591
592 unrefer_xattr_datum(c, xd);
593 }
594
595 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
596 {
597 /* It's called from jffs2_evict_inode() on inode removing.
598 When an inode with XATTR is removed, those XATTRs must be removed. */
599 struct jffs2_xattr_ref *ref, *_ref;
600
601 if (!ic || ic->pino_nlink > 0)
602 return;
603
604 down_write(&c->xattr_sem);
605 for (ref = ic->xref; ref; ref = _ref) {
606 _ref = ref->next;
607 delete_xattr_ref(c, ref);
608 }
609 ic->xref = NULL;
610 up_write(&c->xattr_sem);
611 }
612
613 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
614 {
615 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
616 struct jffs2_xattr_datum *xd;
617 struct jffs2_xattr_ref *ref, *_ref;
618
619 down_write(&c->xattr_sem);
620 for (ref = ic->xref; ref; ref = _ref) {
621 _ref = ref->next;
622 xd = ref->xd;
623 if (atomic_dec_and_test(&xd->refcnt)) {
624 unload_xattr_datum(c, xd);
625 jffs2_free_xattr_datum(xd);
626 }
627 jffs2_free_xattr_ref(ref);
628 }
629 ic->xref = NULL;
630 up_write(&c->xattr_sem);
631 }
632
633 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
634 {
635 /* success of check_xattr_ref_inode() means that inode (ic) dose not have
636 * duplicate name/value pairs. If duplicate name/value pair would be found,
637 * one will be removed.
638 */
639 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
640 int rc = 0;
641
642 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
643 return 0;
644 down_write(&c->xattr_sem);
645 retry:
646 rc = 0;
647 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
648 if (!ref->xd->xname) {
649 rc = load_xattr_datum(c, ref->xd);
650 if (unlikely(rc > 0)) {
651 *pref = ref->next;
652 delete_xattr_ref(c, ref);
653 goto retry;
654 } else if (unlikely(rc < 0))
655 goto out;
656 }
657 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
658 if (!cmp->xd->xname) {
659 ref->xd->flags |= JFFS2_XFLAGS_BIND;
660 rc = load_xattr_datum(c, cmp->xd);
661 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
662 if (unlikely(rc > 0)) {
663 *pcmp = cmp->next;
664 delete_xattr_ref(c, cmp);
665 goto retry;
666 } else if (unlikely(rc < 0))
667 goto out;
668 }
669 if (ref->xd->xprefix == cmp->xd->xprefix
670 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
671 if (ref->xseqno > cmp->xseqno) {
672 *pcmp = cmp->next;
673 delete_xattr_ref(c, cmp);
674 } else {
675 *pref = ref->next;
676 delete_xattr_ref(c, ref);
677 }
678 goto retry;
679 }
680 }
681 }
682 ic->flags |= INO_FLAGS_XATTR_CHECKED;
683 out:
684 up_write(&c->xattr_sem);
685
686 return rc;
687 }
688
689 void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
690 {
691 check_xattr_ref_inode(c, ic);
692 }
693
694 /* -------- xattr subsystem functions ---------------
695 * jffs2_init_xattr_subsystem(c)
696 * is used to initialize semaphore and list_head, and some variables.
697 * jffs2_find_xattr_datum(c, xid)
698 * is used to lookup xdatum while scanning process.
699 * jffs2_clear_xattr_subsystem(c)
700 * is used to release any xattr related objects.
701 * jffs2_build_xattr_subsystem(c)
702 * is used to associate xdatum and xref while super block building process.
703 * jffs2_setup_xattr_datum(c, xid, version)
704 * is used to insert xdatum while scanning process.
705 * -------------------------------------------------- */
706 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
707 {
708 int i;
709
710 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
711 INIT_LIST_HEAD(&c->xattrindex[i]);
712 INIT_LIST_HEAD(&c->xattr_unchecked);
713 INIT_LIST_HEAD(&c->xattr_dead_list);
714 c->xref_dead_list = NULL;
715 c->xref_temp = NULL;
716
717 init_rwsem(&c->xattr_sem);
718 c->highest_xid = 0;
719 c->highest_xseqno = 0;
720 c->xdatum_mem_usage = 0;
721 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
722 }
723
724 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
725 {
726 struct jffs2_xattr_datum *xd;
727 int i = xid % XATTRINDEX_HASHSIZE;
728
729 /* It's only used in scanning/building process. */
730 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
731
732 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
733 if (xd->xid==xid)
734 return xd;
735 }
736 return NULL;
737 }
738
739 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
740 {
741 struct jffs2_xattr_datum *xd, *_xd;
742 struct jffs2_xattr_ref *ref, *_ref;
743 int i;
744
745 for (ref=c->xref_temp; ref; ref = _ref) {
746 _ref = ref->next;
747 jffs2_free_xattr_ref(ref);
748 }
749
750 for (ref=c->xref_dead_list; ref; ref = _ref) {
751 _ref = ref->next;
752 jffs2_free_xattr_ref(ref);
753 }
754
755 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
756 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
757 list_del(&xd->xindex);
758 if (xd->xname)
759 kfree(xd->xname);
760 jffs2_free_xattr_datum(xd);
761 }
762 }
763
764 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
765 list_del(&xd->xindex);
766 jffs2_free_xattr_datum(xd);
767 }
768 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
769 list_del(&xd->xindex);
770 jffs2_free_xattr_datum(xd);
771 }
772 }
773
774 #define XREF_TMPHASH_SIZE (128)
775 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
776 {
777 struct jffs2_xattr_ref *ref, *_ref;
778 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
779 struct jffs2_xattr_datum *xd, *_xd;
780 struct jffs2_inode_cache *ic;
781 struct jffs2_raw_node_ref *raw;
782 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
783 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0;
784
785 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
786
787 /* Phase.1 : Merge same xref */
788 for (i=0; i < XREF_TMPHASH_SIZE; i++)
789 xref_tmphash[i] = NULL;
790 for (ref=c->xref_temp; ref; ref=_ref) {
791 struct jffs2_xattr_ref *tmp;
792
793 _ref = ref->next;
794 if (ref_flags(ref->node) != REF_PRISTINE) {
795 if (verify_xattr_ref(c, ref)) {
796 BUG_ON(ref->node->next_in_ino != (void *)ref);
797 ref->node->next_in_ino = NULL;
798 jffs2_mark_node_obsolete(c, ref->node);
799 jffs2_free_xattr_ref(ref);
800 continue;
801 }
802 }
803
804 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
805 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
806 if (tmp->ino == ref->ino && tmp->xid == ref->xid)
807 break;
808 }
809 if (tmp) {
810 raw = ref->node;
811 if (ref->xseqno > tmp->xseqno) {
812 tmp->xseqno = ref->xseqno;
813 raw->next_in_ino = tmp->node;
814 tmp->node = raw;
815 } else {
816 raw->next_in_ino = tmp->node->next_in_ino;
817 tmp->node->next_in_ino = raw;
818 }
819 jffs2_free_xattr_ref(ref);
820 continue;
821 } else {
822 ref->next = xref_tmphash[i];
823 xref_tmphash[i] = ref;
824 }
825 }
826 c->xref_temp = NULL;
827
828 /* Phase.2 : Bind xref with inode_cache and xattr_datum */
829 for (i=0; i < XREF_TMPHASH_SIZE; i++) {
830 for (ref=xref_tmphash[i]; ref; ref=_ref) {
831 xref_count++;
832 _ref = ref->next;
833 if (is_xattr_ref_dead(ref)) {
834 ref->next = c->xref_dead_list;
835 c->xref_dead_list = ref;
836 xref_dead_count++;
837 continue;
838 }
839 /* At this point, ref->xid and ref->ino contain XID and inode number.
840 ref->xd and ref->ic are not valid yet. */
841 xd = jffs2_find_xattr_datum(c, ref->xid);
842 ic = jffs2_get_ino_cache(c, ref->ino);
843 if (!xd || !ic || !ic->pino_nlink) {
844 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n",
845 ref->ino, ref->xid, ref->xseqno);
846 ref->xseqno |= XREF_DELETE_MARKER;
847 ref->next = c->xref_dead_list;
848 c->xref_dead_list = ref;
849 xref_orphan_count++;
850 continue;
851 }
852 ref->xd = xd;
853 ref->ic = ic;
854 atomic_inc(&xd->refcnt);
855 ref->next = ic->xref;
856 ic->xref = ref;
857 }
858 }
859
860 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */
861 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
862 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
863 xdatum_count++;
864 list_del_init(&xd->xindex);
865 if (!atomic_read(&xd->refcnt)) {
866 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n",
867 xd->xid, xd->version);
868 xd->flags |= JFFS2_XFLAGS_DEAD;
869 list_add(&xd->xindex, &c->xattr_unchecked);
870 xdatum_orphan_count++;
871 continue;
872 }
873 if (is_xattr_datum_unchecked(c, xd)) {
874 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
875 xd->xid, xd->version);
876 list_add(&xd->xindex, &c->xattr_unchecked);
877 xdatum_unchecked_count++;
878 }
879 }
880 }
881 /* build complete */
882 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum"
883 " (%u unchecked, %u orphan) and "
884 "%u of xref (%u dead, %u orphan) found.\n",
885 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
886 xref_count, xref_dead_count, xref_orphan_count);
887 }
888
889 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
890 uint32_t xid, uint32_t version)
891 {
892 struct jffs2_xattr_datum *xd;
893
894 xd = jffs2_find_xattr_datum(c, xid);
895 if (!xd) {
896 xd = jffs2_alloc_xattr_datum();
897 if (!xd)
898 return ERR_PTR(-ENOMEM);
899 xd->xid = xid;
900 xd->version = version;
901 if (xd->xid > c->highest_xid)
902 c->highest_xid = xd->xid;
903 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
904 }
905 return xd;
906 }
907
908 /* -------- xattr subsystem functions ---------------
909 * xprefix_to_handler(xprefix)
910 * is used to translate xprefix into xattr_handler.
911 * jffs2_listxattr(dentry, buffer, size)
912 * is an implementation of listxattr handler on jffs2.
913 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
914 * is an implementation of getxattr handler on jffs2.
915 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
916 * is an implementation of setxattr handler on jffs2.
917 * -------------------------------------------------- */
918 const struct xattr_handler *jffs2_xattr_handlers[] = {
919 &jffs2_user_xattr_handler,
920 #ifdef CONFIG_JFFS2_FS_SECURITY
921 &jffs2_security_xattr_handler,
922 #endif
923 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
924 &jffs2_acl_access_xattr_handler,
925 &jffs2_acl_default_xattr_handler,
926 #endif
927 &jffs2_trusted_xattr_handler,
928 NULL
929 };
930
931 static const struct xattr_handler *xprefix_to_handler(int xprefix) {
932 const struct xattr_handler *ret;
933
934 switch (xprefix) {
935 case JFFS2_XPREFIX_USER:
936 ret = &jffs2_user_xattr_handler;
937 break;
938 #ifdef CONFIG_JFFS2_FS_SECURITY
939 case JFFS2_XPREFIX_SECURITY:
940 ret = &jffs2_security_xattr_handler;
941 break;
942 #endif
943 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
944 case JFFS2_XPREFIX_ACL_ACCESS:
945 ret = &jffs2_acl_access_xattr_handler;
946 break;
947 case JFFS2_XPREFIX_ACL_DEFAULT:
948 ret = &jffs2_acl_default_xattr_handler;
949 break;
950 #endif
951 case JFFS2_XPREFIX_TRUSTED:
952 ret = &jffs2_trusted_xattr_handler;
953 break;
954 default:
955 ret = NULL;
956 break;
957 }
958 return ret;
959 }
960
961 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
962 {
963 struct inode *inode = dentry->d_inode;
964 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
965 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
966 struct jffs2_inode_cache *ic = f->inocache;
967 struct jffs2_xattr_ref *ref, **pref;
968 struct jffs2_xattr_datum *xd;
969 const struct xattr_handler *xhandle;
970 ssize_t len, rc;
971 int retry = 0;
972
973 rc = check_xattr_ref_inode(c, ic);
974 if (unlikely(rc))
975 return rc;
976
977 down_read(&c->xattr_sem);
978 retry:
979 len = 0;
980 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
981 BUG_ON(ref->ic != ic);
982 xd = ref->xd;
983 if (!xd->xname) {
984 /* xdatum is unchached */
985 if (!retry) {
986 retry = 1;
987 up_read(&c->xattr_sem);
988 down_write(&c->xattr_sem);
989 goto retry;
990 } else {
991 rc = load_xattr_datum(c, xd);
992 if (unlikely(rc > 0)) {
993 *pref = ref->next;
994 delete_xattr_ref(c, ref);
995 goto retry;
996 } else if (unlikely(rc < 0))
997 goto out;
998 }
999 }
1000 xhandle = xprefix_to_handler(xd->xprefix);
1001 if (!xhandle)
1002 continue;
1003 if (buffer) {
1004 rc = xhandle->list(dentry, buffer+len, size-len,
1005 xd->xname, xd->name_len, xd->flags);
1006 } else {
1007 rc = xhandle->list(dentry, NULL, 0, xd->xname,
1008 xd->name_len, xd->flags);
1009 }
1010 if (rc < 0)
1011 goto out;
1012 len += rc;
1013 }
1014 rc = len;
1015 out:
1016 if (!retry) {
1017 up_read(&c->xattr_sem);
1018 } else {
1019 up_write(&c->xattr_sem);
1020 }
1021 return rc;
1022 }
1023
1024 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
1025 char *buffer, size_t size)
1026 {
1027 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1028 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1029 struct jffs2_inode_cache *ic = f->inocache;
1030 struct jffs2_xattr_datum *xd;
1031 struct jffs2_xattr_ref *ref, **pref;
1032 int rc, retry = 0;
1033
1034 rc = check_xattr_ref_inode(c, ic);
1035 if (unlikely(rc))
1036 return rc;
1037
1038 down_read(&c->xattr_sem);
1039 retry:
1040 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1041 BUG_ON(ref->ic!=ic);
1042
1043 xd = ref->xd;
1044 if (xd->xprefix != xprefix)
1045 continue;
1046 if (!xd->xname) {
1047 /* xdatum is unchached */
1048 if (!retry) {
1049 retry = 1;
1050 up_read(&c->xattr_sem);
1051 down_write(&c->xattr_sem);
1052 goto retry;
1053 } else {
1054 rc = load_xattr_datum(c, xd);
1055 if (unlikely(rc > 0)) {
1056 *pref = ref->next;
1057 delete_xattr_ref(c, ref);
1058 goto retry;
1059 } else if (unlikely(rc < 0)) {
1060 goto out;
1061 }
1062 }
1063 }
1064 if (!strcmp(xname, xd->xname)) {
1065 rc = xd->value_len;
1066 if (buffer) {
1067 if (size < rc) {
1068 rc = -ERANGE;
1069 } else {
1070 memcpy(buffer, xd->xvalue, rc);
1071 }
1072 }
1073 goto out;
1074 }
1075 }
1076 rc = -ENODATA;
1077 out:
1078 if (!retry) {
1079 up_read(&c->xattr_sem);
1080 } else {
1081 up_write(&c->xattr_sem);
1082 }
1083 return rc;
1084 }
1085
1086 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1087 const char *buffer, size_t size, int flags)
1088 {
1089 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1090 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1091 struct jffs2_inode_cache *ic = f->inocache;
1092 struct jffs2_xattr_datum *xd;
1093 struct jffs2_xattr_ref *ref, *newref, **pref;
1094 uint32_t length, request;
1095 int rc;
1096
1097 rc = check_xattr_ref_inode(c, ic);
1098 if (unlikely(rc))
1099 return rc;
1100
1101 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1102 rc = jffs2_reserve_space(c, request, &length,
1103 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1104 if (rc) {
1105 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1106 return rc;
1107 }
1108
1109 /* Find existing xattr */
1110 down_write(&c->xattr_sem);
1111 retry:
1112 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1113 xd = ref->xd;
1114 if (xd->xprefix != xprefix)
1115 continue;
1116 if (!xd->xname) {
1117 rc = load_xattr_datum(c, xd);
1118 if (unlikely(rc > 0)) {
1119 *pref = ref->next;
1120 delete_xattr_ref(c, ref);
1121 goto retry;
1122 } else if (unlikely(rc < 0))
1123 goto out;
1124 }
1125 if (!strcmp(xd->xname, xname)) {
1126 if (flags & XATTR_CREATE) {
1127 rc = -EEXIST;
1128 goto out;
1129 }
1130 if (!buffer) {
1131 ref->ino = ic->ino;
1132 ref->xid = xd->xid;
1133 ref->xseqno |= XREF_DELETE_MARKER;
1134 rc = save_xattr_ref(c, ref);
1135 if (!rc) {
1136 *pref = ref->next;
1137 spin_lock(&c->erase_completion_lock);
1138 ref->next = c->xref_dead_list;
1139 c->xref_dead_list = ref;
1140 spin_unlock(&c->erase_completion_lock);
1141 unrefer_xattr_datum(c, xd);
1142 } else {
1143 ref->ic = ic;
1144 ref->xd = xd;
1145 ref->xseqno &= ~XREF_DELETE_MARKER;
1146 }
1147 goto out;
1148 }
1149 goto found;
1150 }
1151 }
1152 /* not found */
1153 if (flags & XATTR_REPLACE) {
1154 rc = -ENODATA;
1155 goto out;
1156 }
1157 if (!buffer) {
1158 rc = -ENODATA;
1159 goto out;
1160 }
1161 found:
1162 xd = create_xattr_datum(c, xprefix, xname, buffer, size);
1163 if (IS_ERR(xd)) {
1164 rc = PTR_ERR(xd);
1165 goto out;
1166 }
1167 up_write(&c->xattr_sem);
1168 jffs2_complete_reservation(c);
1169
1170 /* create xattr_ref */
1171 request = PAD(sizeof(struct jffs2_raw_xref));
1172 rc = jffs2_reserve_space(c, request, &length,
1173 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
1174 down_write(&c->xattr_sem);
1175 if (rc) {
1176 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1177 unrefer_xattr_datum(c, xd);
1178 up_write(&c->xattr_sem);
1179 return rc;
1180 }
1181 if (ref)
1182 *pref = ref->next;
1183 newref = create_xattr_ref(c, ic, xd);
1184 if (IS_ERR(newref)) {
1185 if (ref) {
1186 ref->next = ic->xref;
1187 ic->xref = ref;
1188 }
1189 rc = PTR_ERR(newref);
1190 unrefer_xattr_datum(c, xd);
1191 } else if (ref) {
1192 delete_xattr_ref(c, ref);
1193 }
1194 out:
1195 up_write(&c->xattr_sem);
1196 jffs2_complete_reservation(c);
1197 return rc;
1198 }
1199
1200 /* -------- garbage collector functions -------------
1201 * jffs2_garbage_collect_xattr_datum(c, xd, raw)
1202 * is used to move xdatum into new node.
1203 * jffs2_garbage_collect_xattr_ref(c, ref, raw)
1204 * is used to move xref into new node.
1205 * jffs2_verify_xattr(c)
1206 * is used to call do_verify_xattr_datum() before garbage collecting.
1207 * jffs2_release_xattr_datum(c, xd)
1208 * is used to release an in-memory object of xdatum.
1209 * jffs2_release_xattr_ref(c, ref)
1210 * is used to release an in-memory object of xref.
1211 * -------------------------------------------------- */
1212 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
1213 struct jffs2_raw_node_ref *raw)
1214 {
1215 uint32_t totlen, length, old_ofs;
1216 int rc = 0;
1217
1218 down_write(&c->xattr_sem);
1219 if (xd->node != raw)
1220 goto out;
1221 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
1222 goto out;
1223
1224 rc = load_xattr_datum(c, xd);
1225 if (unlikely(rc)) {
1226 rc = (rc > 0) ? 0 : rc;
1227 goto out;
1228 }
1229 old_ofs = ref_offset(xd->node);
1230 totlen = PAD(sizeof(struct jffs2_raw_xattr)
1231 + xd->name_len + 1 + xd->value_len);
1232 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
1233 if (rc) {
1234 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
1235 goto out;
1236 }
1237 rc = save_xattr_datum(c, xd);
1238 if (!rc)
1239 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1240 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1241 out:
1242 if (!rc)
1243 jffs2_mark_node_obsolete(c, raw);
1244 up_write(&c->xattr_sem);
1245 return rc;
1246 }
1247
1248 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
1249 struct jffs2_raw_node_ref *raw)
1250 {
1251 uint32_t totlen, length, old_ofs;
1252 int rc = 0;
1253
1254 down_write(&c->xattr_sem);
1255 BUG_ON(!ref->node);
1256
1257 if (ref->node != raw)
1258 goto out;
1259 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
1260 goto out;
1261
1262 old_ofs = ref_offset(ref->node);
1263 totlen = ref_totlen(c, c->gcblock, ref->node);
1264
1265 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
1266 if (rc) {
1267 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
1268 __func__, rc, totlen);
1269 rc = rc ? rc : -EBADFD;
1270 goto out;
1271 }
1272 rc = save_xattr_ref(c, ref);
1273 if (!rc)
1274 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1275 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1276 out:
1277 if (!rc)
1278 jffs2_mark_node_obsolete(c, raw);
1279 up_write(&c->xattr_sem);
1280 return rc;
1281 }
1282
1283 int jffs2_verify_xattr(struct jffs2_sb_info *c)
1284 {
1285 struct jffs2_xattr_datum *xd, *_xd;
1286 struct jffs2_eraseblock *jeb;
1287 struct jffs2_raw_node_ref *raw;
1288 uint32_t totlen;
1289 int rc;
1290
1291 down_write(&c->xattr_sem);
1292 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1293 rc = do_verify_xattr_datum(c, xd);
1294 if (rc < 0)
1295 continue;
1296 list_del_init(&xd->xindex);
1297 spin_lock(&c->erase_completion_lock);
1298 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
1299 if (ref_flags(raw) != REF_UNCHECKED)
1300 continue;
1301 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
1302 totlen = PAD(ref_totlen(c, jeb, raw));
1303 c->unchecked_size -= totlen; c->used_size += totlen;
1304 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
1305 raw->flash_offset = ref_offset(raw)
1306 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
1307 }
1308 if (xd->flags & JFFS2_XFLAGS_DEAD)
1309 list_add(&xd->xindex, &c->xattr_dead_list);
1310 spin_unlock(&c->erase_completion_lock);
1311 }
1312 up_write(&c->xattr_sem);
1313 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1314 }
1315
1316 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
1317 {
1318 /* must be called under spin_lock(&c->erase_completion_lock) */
1319 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd)
1320 return;
1321
1322 list_del(&xd->xindex);
1323 jffs2_free_xattr_datum(xd);
1324 }
1325
1326 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
1327 {
1328 /* must be called under spin_lock(&c->erase_completion_lock) */
1329 struct jffs2_xattr_ref *tmp, **ptmp;
1330
1331 if (ref->node != (void *)ref)
1332 return;
1333
1334 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
1335 if (ref == tmp) {
1336 *ptmp = tmp->next;
1337 break;
1338 }
1339 }
1340 jffs2_free_xattr_ref(ref);
1341 }
CJK support for tty framebuffer vt