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[linux-2.6.22.y-op.git] / fs / jffs2 / xattr.c
blob4da09ce1d1f52fc12182ab34afceef584706b186
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 uint32_t xid = xd->xid, version = xd->version;
403
404 unload_xattr_datum(c, xd);
405 xd->flags |= JFFS2_XFLAGS_DEAD;
406 if (xd->node == (void *)xd) {
407 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID));
408 jffs2_free_xattr_datum(xd);
409 } else {
410 list_add(&xd->xindex, &c->xattr_dead_list);
411 }
412 spin_unlock(&c->erase_completion_lock);
413
414 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", xid, version);
415 }
416 }
417
418 /* -------- xref related functions ------------------
419 * verify_xattr_ref(c, ref)
420 * is used to load xref information from medium. Because summary data does not
421 * contain xid/ino, it's necessary to verify once while mounting process.
422 * save_xattr_ref(c, ref)
423 * is used to write xref to medium. If delete marker is marked, it write
424 * a delete marker of xref into medium.
425 * create_xattr_ref(c, ic, xd)
426 * is used to create a new xref and write to medium.
427 * delete_xattr_ref(c, ref)
428 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER,
429 * and allows GC to reclaim those physical nodes.
430 * jffs2_xattr_delete_inode(c, ic)
431 * is called to remove xrefs related to obsolete inode when inode is unlinked.
432 * jffs2_xattr_free_inode(c, ic)
433 * is called to release xattr related objects when unmounting.
434 * check_xattr_ref_inode(c, ic)
435 * is used to confirm inode does not have duplicate xattr name/value pair.
436 * -------------------------------------------------- */
437 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
438 {
439 struct jffs2_eraseblock *jeb;
440 struct jffs2_raw_node_ref *raw;
441 struct jffs2_raw_xref rr;
442 size_t readlen;
443 uint32_t crc, offset, totlen;
444 int rc;
445
446 spin_lock(&c->erase_completion_lock);
447 if (ref_flags(ref->node) != REF_UNCHECKED)
448 goto complete;
449 offset = ref_offset(ref->node);
450 spin_unlock(&c->erase_completion_lock);
451
452 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);
453 if (rc || sizeof(rr) != readlen) {
454 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
455 rc, sizeof(rr), readlen, offset);
456 return rc ? rc : -EIO;
457 }
458 /* obsolete node */
459 crc = crc32(0, &rr, sizeof(rr) - 4);
460 if (crc != je32_to_cpu(rr.node_crc)) {
461 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
462 offset, je32_to_cpu(rr.node_crc), crc);
463 return EIO;
464 }
465 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
466 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
467 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
468 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
469 "nodetype=%#04x/%#04x, totlen=%u/%zu\n",
470 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
471 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
472 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
473 return EIO;
474 }
475 ref->ino = je32_to_cpu(rr.ino);
476 ref->xid = je32_to_cpu(rr.xid);
477 ref->xseqno = je32_to_cpu(rr.xseqno);
478 if (ref->xseqno > c->highest_xseqno)
479 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
480
481 spin_lock(&c->erase_completion_lock);
482 complete:
483 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {
484 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
485 totlen = PAD(ref_totlen(c, jeb, raw));
486 if (ref_flags(raw) == REF_UNCHECKED) {
487 c->unchecked_size -= totlen; c->used_size += totlen;
488 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
489 }
490 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);
491 }
492 spin_unlock(&c->erase_completion_lock);
493
494 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
495 ref->ino, ref->xid, ref_offset(ref->node));
496 return 0;
497 }
498
499 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
500 {
501 /* must be called under down_write(xattr_sem) */
502 struct jffs2_raw_xref rr;
503 size_t length;
504 uint32_t xseqno, phys_ofs = write_ofs(c);
505 int ret;
506
507 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
508 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
509 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
510 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
511
512 xseqno = (c->highest_xseqno += 2);
513 if (is_xattr_ref_dead(ref)) {
514 xseqno |= XREF_DELETE_MARKER;
515 rr.ino = cpu_to_je32(ref->ino);
516 rr.xid = cpu_to_je32(ref->xid);
517 } else {
518 rr.ino = cpu_to_je32(ref->ic->ino);
519 rr.xid = cpu_to_je32(ref->xd->xid);
520 }
521 rr.xseqno = cpu_to_je32(xseqno);
522 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
523
524 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
525 if (ret || sizeof(rr) != length) {
526 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
527 ret, sizeof(rr), length, phys_ofs);
528 ret = ret ? ret : -EIO;
529 if (length)
530 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
531
532 return ret;
533 }
534 /* success */
535 ref->xseqno = xseqno;
536 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);
537
538 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
539
540 return 0;
541 }
542
543 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
544 struct jffs2_xattr_datum *xd)
545 {
546 /* must be called under down_write(xattr_sem) */
547 struct jffs2_xattr_ref *ref;
548 int ret;
549
550 ref = jffs2_alloc_xattr_ref();
551 if (!ref)
552 return ERR_PTR(-ENOMEM);
553 ref->ic = ic;
554 ref->xd = xd;
555
556 ret = save_xattr_ref(c, ref);
557 if (ret) {
558 jffs2_free_xattr_ref(ref);
559 return ERR_PTR(ret);
560 }
561
562 /* Chain to inode */
563 ref->next = ic->xref;
564 ic->xref = ref;
565
566 return ref; /* success */
567 }
568
569 static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
570 {
571 /* must be called under down_write(xattr_sem) */
572 struct jffs2_xattr_datum *xd;
573
574 xd = ref->xd;
575 ref->xseqno |= XREF_DELETE_MARKER;
576 ref->ino = ref->ic->ino;
577 ref->xid = ref->xd->xid;
578 spin_lock(&c->erase_completion_lock);
579 ref->next = c->xref_dead_list;
580 c->xref_dead_list = ref;
581 spin_unlock(&c->erase_completion_lock);
582
583 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
584 ref->ino, ref->xid, ref->xseqno);
585
586 unrefer_xattr_datum(c, xd);
587 }
588
589 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
590 {
591 /* It's called from jffs2_clear_inode() on inode removing.
592 When an inode with XATTR is removed, those XATTRs must be removed. */
593 struct jffs2_xattr_ref *ref, *_ref;
594
595 if (!ic || ic->nlink > 0)
596 return;
597
598 down_write(&c->xattr_sem);
599 for (ref = ic->xref; ref; ref = _ref) {
600 _ref = ref->next;
601 delete_xattr_ref(c, ref);
602 }
603 ic->xref = NULL;
604 up_write(&c->xattr_sem);
605 }
606
607 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
608 {
609 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
610 struct jffs2_xattr_datum *xd;
611 struct jffs2_xattr_ref *ref, *_ref;
612
613 down_write(&c->xattr_sem);
614 for (ref = ic->xref; ref; ref = _ref) {
615 _ref = ref->next;
616 xd = ref->xd;
617 if (atomic_dec_and_test(&xd->refcnt)) {
618 unload_xattr_datum(c, xd);
619 jffs2_free_xattr_datum(xd);
620 }
621 jffs2_free_xattr_ref(ref);
622 }
623 ic->xref = NULL;
624 up_write(&c->xattr_sem);
625 }
626
627 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
628 {
629 /* success of check_xattr_ref_inode() means taht inode (ic) dose not have
630 * duplicate name/value pairs. If duplicate name/value pair would be found,
631 * one will be removed.
632 */
633 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
634 int rc = 0;
635
636 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
637 return 0;
638 down_write(&c->xattr_sem);
639 retry:
640 rc = 0;
641 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
642 if (!ref->xd->xname) {
643 rc = load_xattr_datum(c, ref->xd);
644 if (unlikely(rc > 0)) {
645 *pref = ref->next;
646 delete_xattr_ref(c, ref);
647 goto retry;
648 } else if (unlikely(rc < 0))
649 goto out;
650 }
651 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
652 if (!cmp->xd->xname) {
653 ref->xd->flags |= JFFS2_XFLAGS_BIND;
654 rc = load_xattr_datum(c, cmp->xd);
655 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
656 if (unlikely(rc > 0)) {
657 *pcmp = cmp->next;
658 delete_xattr_ref(c, cmp);
659 goto retry;
660 } else if (unlikely(rc < 0))
661 goto out;
662 }
663 if (ref->xd->xprefix == cmp->xd->xprefix
664 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
665 if (ref->xseqno > cmp->xseqno) {
666 *pcmp = cmp->next;
667 delete_xattr_ref(c, cmp);
668 } else {
669 *pref = ref->next;
670 delete_xattr_ref(c, ref);
671 }
672 goto retry;
673 }
674 }
675 }
676 ic->flags |= INO_FLAGS_XATTR_CHECKED;
677 out:
678 up_write(&c->xattr_sem);
679
680 return rc;
681 }
682
683 /* -------- xattr subsystem functions ---------------
684 * jffs2_init_xattr_subsystem(c)
685 * is used to initialize semaphore and list_head, and some variables.
686 * jffs2_find_xattr_datum(c, xid)
687 * is used to lookup xdatum while scanning process.
688 * jffs2_clear_xattr_subsystem(c)
689 * is used to release any xattr related objects.
690 * jffs2_build_xattr_subsystem(c)
691 * is used to associate xdatum and xref while super block building process.
692 * jffs2_setup_xattr_datum(c, xid, version)
693 * is used to insert xdatum while scanning process.
694 * -------------------------------------------------- */
695 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
696 {
697 int i;
698
699 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
700 INIT_LIST_HEAD(&c->xattrindex[i]);
701 INIT_LIST_HEAD(&c->xattr_unchecked);
702 INIT_LIST_HEAD(&c->xattr_dead_list);
703 c->xref_dead_list = NULL;
704 c->xref_temp = NULL;
705
706 init_rwsem(&c->xattr_sem);
707 c->highest_xid = 0;
708 c->highest_xseqno = 0;
709 c->xdatum_mem_usage = 0;
710 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
711 }
712
713 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
714 {
715 struct jffs2_xattr_datum *xd;
716 int i = xid % XATTRINDEX_HASHSIZE;
717
718 /* It's only used in scanning/building process. */
719 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
720
721 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
722 if (xd->xid==xid)
723 return xd;
724 }
725 return NULL;
726 }
727
728 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
729 {
730 struct jffs2_xattr_datum *xd, *_xd;
731 struct jffs2_xattr_ref *ref, *_ref;
732 int i;
733
734 for (ref=c->xref_temp; ref; ref = _ref) {
735 _ref = ref->next;
736 jffs2_free_xattr_ref(ref);
737 }
738
739 for (ref=c->xref_dead_list; ref; ref = _ref) {
740 _ref = ref->next;
741 jffs2_free_xattr_ref(ref);
742 }
743
744 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
745 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
746 list_del(&xd->xindex);
747 if (xd->xname)
748 kfree(xd->xname);
749 jffs2_free_xattr_datum(xd);
750 }
751 }
752
753 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
754 list_del(&xd->xindex);
755 jffs2_free_xattr_datum(xd);
756 }
757 }
758
759 #define XREF_TMPHASH_SIZE (128)
760 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
761 {
762 struct jffs2_xattr_ref *ref, *_ref;
763 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
764 struct jffs2_xattr_datum *xd, *_xd;
765 struct jffs2_inode_cache *ic;
766 struct jffs2_raw_node_ref *raw;
767 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
768 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0;
769
770 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
771
772 /* Phase.1 : Merge same xref */
773 for (i=0; i < XREF_TMPHASH_SIZE; i++)
774 xref_tmphash[i] = NULL;
775 for (ref=c->xref_temp; ref; ref=_ref) {
776 struct jffs2_xattr_ref *tmp;
777
778 _ref = ref->next;
779 if (ref_flags(ref->node) != REF_PRISTINE) {
780 if (verify_xattr_ref(c, ref)) {
781 BUG_ON(ref->node->next_in_ino != (void *)ref);
782 ref->node->next_in_ino = NULL;
783 jffs2_mark_node_obsolete(c, ref->node);
784 jffs2_free_xattr_ref(ref);
785 continue;
786 }
787 }
788
789 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
790 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
791 if (tmp->ino == ref->ino && tmp->xid == ref->xid)
792 break;
793 }
794 if (tmp) {
795 raw = ref->node;
796 if (ref->xseqno > tmp->xseqno) {
797 tmp->xseqno = ref->xseqno;
798 raw->next_in_ino = tmp->node;
799 tmp->node = raw;
800 } else {
801 raw->next_in_ino = tmp->node->next_in_ino;
802 tmp->node->next_in_ino = raw;
803 }
804 jffs2_free_xattr_ref(ref);
805 continue;
806 } else {
807 ref->next = xref_tmphash[i];
808 xref_tmphash[i] = ref;
809 }
810 }
811 c->xref_temp = NULL;
812
813 /* Phase.2 : Bind xref with inode_cache and xattr_datum */
814 for (i=0; i < XREF_TMPHASH_SIZE; i++) {
815 for (ref=xref_tmphash[i]; ref; ref=_ref) {
816 xref_count++;
817 _ref = ref->next;
818 if (is_xattr_ref_dead(ref)) {
819 ref->next = c->xref_dead_list;
820 c->xref_dead_list = ref;
821 xref_dead_count++;
822 continue;
823 }
824 /* At this point, ref->xid and ref->ino contain XID and inode number.
825 ref->xd and ref->ic are not valid yet. */
826 xd = jffs2_find_xattr_datum(c, ref->xid);
827 ic = jffs2_get_ino_cache(c, ref->ino);
828 if (!xd || !ic) {
829 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n",
830 ref->ino, ref->xid, ref->xseqno);
831 ref->xseqno |= XREF_DELETE_MARKER;
832 ref->next = c->xref_dead_list;
833 c->xref_dead_list = ref;
834 xref_orphan_count++;
835 continue;
836 }
837 ref->xd = xd;
838 ref->ic = ic;
839 atomic_inc(&xd->refcnt);
840 ref->next = ic->xref;
841 ic->xref = ref;
842 }
843 }
844
845 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */
846 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
847 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
848 xdatum_count++;
849 list_del_init(&xd->xindex);
850 if (!atomic_read(&xd->refcnt)) {
851 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n",
852 xd->xid, xd->version);
853 xd->flags |= JFFS2_XFLAGS_DEAD;
854 list_add(&xd->xindex, &c->xattr_unchecked);
855 xdatum_orphan_count++;
856 continue;
857 }
858 if (is_xattr_datum_unchecked(c, xd)) {
859 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
860 xd->xid, xd->version);
861 list_add(&xd->xindex, &c->xattr_unchecked);
862 xdatum_unchecked_count++;
863 }
864 }
865 }
866 /* build complete */
867 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum"
868 " (%u unchecked, %u orphan) and "
869 "%u of xref (%u dead, %u orphan) found.\n",
870 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
871 xref_count, xref_dead_count, xref_orphan_count);
872 }
873
874 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
875 uint32_t xid, uint32_t version)
876 {
877 struct jffs2_xattr_datum *xd;
878
879 xd = jffs2_find_xattr_datum(c, xid);
880 if (!xd) {
881 xd = jffs2_alloc_xattr_datum();
882 if (!xd)
883 return ERR_PTR(-ENOMEM);
884 xd->xid = xid;
885 xd->version = version;
886 if (xd->xid > c->highest_xid)
887 c->highest_xid = xd->xid;
888 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
889 }
890 return xd;
891 }
892
893 /* -------- xattr subsystem functions ---------------
894 * xprefix_to_handler(xprefix)
895 * is used to translate xprefix into xattr_handler.
896 * jffs2_listxattr(dentry, buffer, size)
897 * is an implementation of listxattr handler on jffs2.
898 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
899 * is an implementation of getxattr handler on jffs2.
900 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
901 * is an implementation of setxattr handler on jffs2.
902 * -------------------------------------------------- */
903 struct xattr_handler *jffs2_xattr_handlers[] = {
904 &jffs2_user_xattr_handler,
905 #ifdef CONFIG_JFFS2_FS_SECURITY
906 &jffs2_security_xattr_handler,
907 #endif
908 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
909 &jffs2_acl_access_xattr_handler,
910 &jffs2_acl_default_xattr_handler,
911 #endif
912 &jffs2_trusted_xattr_handler,
913 NULL
914 };
915
916 static struct xattr_handler *xprefix_to_handler(int xprefix) {
917 struct xattr_handler *ret;
918
919 switch (xprefix) {
920 case JFFS2_XPREFIX_USER:
921 ret = &jffs2_user_xattr_handler;
922 break;
923 #ifdef CONFIG_JFFS2_FS_SECURITY
924 case JFFS2_XPREFIX_SECURITY:
925 ret = &jffs2_security_xattr_handler;
926 break;
927 #endif
928 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
929 case JFFS2_XPREFIX_ACL_ACCESS:
930 ret = &jffs2_acl_access_xattr_handler;
931 break;
932 case JFFS2_XPREFIX_ACL_DEFAULT:
933 ret = &jffs2_acl_default_xattr_handler;
934 break;
935 #endif
936 case JFFS2_XPREFIX_TRUSTED:
937 ret = &jffs2_trusted_xattr_handler;
938 break;
939 default:
940 ret = NULL;
941 break;
942 }
943 return ret;
944 }
945
946 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
947 {
948 struct inode *inode = dentry->d_inode;
949 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
950 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
951 struct jffs2_inode_cache *ic = f->inocache;
952 struct jffs2_xattr_ref *ref, **pref;
953 struct jffs2_xattr_datum *xd;
954 struct xattr_handler *xhandle;
955 ssize_t len, rc;
956 int retry = 0;
957
958 rc = check_xattr_ref_inode(c, ic);
959 if (unlikely(rc))
960 return rc;
961
962 down_read(&c->xattr_sem);
963 retry:
964 len = 0;
965 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
966 BUG_ON(ref->ic != ic);
967 xd = ref->xd;
968 if (!xd->xname) {
969 /* xdatum is unchached */
970 if (!retry) {
971 retry = 1;
972 up_read(&c->xattr_sem);
973 down_write(&c->xattr_sem);
974 goto retry;
975 } else {
976 rc = load_xattr_datum(c, xd);
977 if (unlikely(rc > 0)) {
978 *pref = ref->next;
979 delete_xattr_ref(c, ref);
980 goto retry;
981 } else if (unlikely(rc < 0))
982 goto out;
983 }
984 }
985 xhandle = xprefix_to_handler(xd->xprefix);
986 if (!xhandle)
987 continue;
988 if (buffer) {
989 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
990 } else {
991 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
992 }
993 if (rc < 0)
994 goto out;
995 len += rc;
996 }
997 rc = len;
998 out:
999 if (!retry) {
1000 up_read(&c->xattr_sem);
1001 } else {
1002 up_write(&c->xattr_sem);
1003 }
1004 return rc;
1005 }
1006
1007 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
1008 char *buffer, size_t size)
1009 {
1010 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1011 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1012 struct jffs2_inode_cache *ic = f->inocache;
1013 struct jffs2_xattr_datum *xd;
1014 struct jffs2_xattr_ref *ref, **pref;
1015 int rc, retry = 0;
1016
1017 rc = check_xattr_ref_inode(c, ic);
1018 if (unlikely(rc))
1019 return rc;
1020
1021 down_read(&c->xattr_sem);
1022 retry:
1023 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1024 BUG_ON(ref->ic!=ic);
1025
1026 xd = ref->xd;
1027 if (xd->xprefix != xprefix)
1028 continue;
1029 if (!xd->xname) {
1030 /* xdatum is unchached */
1031 if (!retry) {
1032 retry = 1;
1033 up_read(&c->xattr_sem);
1034 down_write(&c->xattr_sem);
1035 goto retry;
1036 } else {
1037 rc = load_xattr_datum(c, xd);
1038 if (unlikely(rc > 0)) {
1039 *pref = ref->next;
1040 delete_xattr_ref(c, ref);
1041 goto retry;
1042 } else if (unlikely(rc < 0)) {
1043 goto out;
1044 }
1045 }
1046 }
1047 if (!strcmp(xname, xd->xname)) {
1048 rc = xd->value_len;
1049 if (buffer) {
1050 if (size < rc) {
1051 rc = -ERANGE;
1052 } else {
1053 memcpy(buffer, xd->xvalue, rc);
1054 }
1055 }
1056 goto out;
1057 }
1058 }
1059 rc = -ENODATA;
1060 out:
1061 if (!retry) {
1062 up_read(&c->xattr_sem);
1063 } else {
1064 up_write(&c->xattr_sem);
1065 }
1066 return rc;
1067 }
1068
1069 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1070 const char *buffer, size_t size, int flags)
1071 {
1072 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1073 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1074 struct jffs2_inode_cache *ic = f->inocache;
1075 struct jffs2_xattr_datum *xd;
1076 struct jffs2_xattr_ref *ref, *newref, **pref;
1077 uint32_t length, request;
1078 int rc;
1079
1080 rc = check_xattr_ref_inode(c, ic);
1081 if (unlikely(rc))
1082 return rc;
1083
1084 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1085 rc = jffs2_reserve_space(c, request, &length,
1086 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1087 if (rc) {
1088 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1089 return rc;
1090 }
1091
1092 /* Find existing xattr */
1093 down_write(&c->xattr_sem);
1094 retry:
1095 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1096 xd = ref->xd;
1097 if (xd->xprefix != xprefix)
1098 continue;
1099 if (!xd->xname) {
1100 rc = load_xattr_datum(c, xd);
1101 if (unlikely(rc > 0)) {
1102 *pref = ref->next;
1103 delete_xattr_ref(c, ref);
1104 goto retry;
1105 } else if (unlikely(rc < 0))
1106 goto out;
1107 }
1108 if (!strcmp(xd->xname, xname)) {
1109 if (flags & XATTR_CREATE) {
1110 rc = -EEXIST;
1111 goto out;
1112 }
1113 if (!buffer) {
1114 ref->ino = ic->ino;
1115 ref->xid = xd->xid;
1116 ref->xseqno |= XREF_DELETE_MARKER;
1117 rc = save_xattr_ref(c, ref);
1118 if (!rc) {
1119 *pref = ref->next;
1120 spin_lock(&c->erase_completion_lock);
1121 ref->next = c->xref_dead_list;
1122 c->xref_dead_list = ref;
1123 spin_unlock(&c->erase_completion_lock);
1124 unrefer_xattr_datum(c, xd);
1125 } else {
1126 ref->ic = ic;
1127 ref->xd = xd;
1128 ref->xseqno &= ~XREF_DELETE_MARKER;
1129 }
1130 goto out;
1131 }
1132 goto found;
1133 }
1134 }
1135 /* not found */
1136 if (flags & XATTR_REPLACE) {
1137 rc = -ENODATA;
1138 goto out;
1139 }
1140 if (!buffer) {
1141 rc = -ENODATA;
1142 goto out;
1143 }
1144 found:
1145 xd = create_xattr_datum(c, xprefix, xname, buffer, size);
1146 if (IS_ERR(xd)) {
1147 rc = PTR_ERR(xd);
1148 goto out;
1149 }
1150 up_write(&c->xattr_sem);
1151 jffs2_complete_reservation(c);
1152
1153 /* create xattr_ref */
1154 request = PAD(sizeof(struct jffs2_raw_xref));
1155 rc = jffs2_reserve_space(c, request, &length,
1156 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
1157 down_write(&c->xattr_sem);
1158 if (rc) {
1159 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1160 unrefer_xattr_datum(c, xd);
1161 up_write(&c->xattr_sem);
1162 return rc;
1163 }
1164 if (ref)
1165 *pref = ref->next;
1166 newref = create_xattr_ref(c, ic, xd);
1167 if (IS_ERR(newref)) {
1168 if (ref) {
1169 ref->next = ic->xref;
1170 ic->xref = ref;
1171 }
1172 rc = PTR_ERR(newref);
1173 unrefer_xattr_datum(c, xd);
1174 } else if (ref) {
1175 delete_xattr_ref(c, ref);
1176 }
1177 out:
1178 up_write(&c->xattr_sem);
1179 jffs2_complete_reservation(c);
1180 return rc;
1181 }
1182
1183 /* -------- garbage collector functions -------------
1184 * jffs2_garbage_collect_xattr_datum(c, xd, raw)
1185 * is used to move xdatum into new node.
1186 * jffs2_garbage_collect_xattr_ref(c, ref, raw)
1187 * is used to move xref into new node.
1188 * jffs2_verify_xattr(c)
1189 * is used to call do_verify_xattr_datum() before garbage collecting.
1190 * jffs2_release_xattr_datum(c, xd)
1191 * is used to release an in-memory object of xdatum.
1192 * jffs2_release_xattr_ref(c, ref)
1193 * is used to release an in-memory object of xref.
1194 * -------------------------------------------------- */
1195 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
1196 struct jffs2_raw_node_ref *raw)
1197 {
1198 uint32_t totlen, length, old_ofs;
1199 int rc = 0;
1200
1201 down_write(&c->xattr_sem);
1202 if (xd->node != raw)
1203 goto out;
1204 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
1205 goto out;
1206
1207 rc = load_xattr_datum(c, xd);
1208 if (unlikely(rc)) {
1209 rc = (rc > 0) ? 0 : rc;
1210 goto out;
1211 }
1212 old_ofs = ref_offset(xd->node);
1213 totlen = PAD(sizeof(struct jffs2_raw_xattr)
1214 + xd->name_len + 1 + xd->value_len);
1215 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
1216 if (rc) {
1217 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
1218 goto out;
1219 }
1220 rc = save_xattr_datum(c, xd);
1221 if (!rc)
1222 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1223 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1224 out:
1225 if (!rc)
1226 jffs2_mark_node_obsolete(c, raw);
1227 up_write(&c->xattr_sem);
1228 return rc;
1229 }
1230
1231 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
1232 struct jffs2_raw_node_ref *raw)
1233 {
1234 uint32_t totlen, length, old_ofs;
1235 int rc = 0;
1236
1237 down_write(&c->xattr_sem);
1238 BUG_ON(!ref->node);
1239
1240 if (ref->node != raw)
1241 goto out;
1242 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
1243 goto out;
1244
1245 old_ofs = ref_offset(ref->node);
1246 totlen = ref_totlen(c, c->gcblock, ref->node);
1247
1248 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
1249 if (rc) {
1250 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
1251 __FUNCTION__, rc, totlen);
1252 rc = rc ? rc : -EBADFD;
1253 goto out;
1254 }
1255 rc = save_xattr_ref(c, ref);
1256 if (!rc)
1257 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1258 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1259 out:
1260 if (!rc)
1261 jffs2_mark_node_obsolete(c, raw);
1262 up_write(&c->xattr_sem);
1263 return rc;
1264 }
1265
1266 int jffs2_verify_xattr(struct jffs2_sb_info *c)
1267 {
1268 struct jffs2_xattr_datum *xd, *_xd;
1269 struct jffs2_eraseblock *jeb;
1270 struct jffs2_raw_node_ref *raw;
1271 uint32_t totlen;
1272 int rc;
1273
1274 down_write(&c->xattr_sem);
1275 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1276 rc = do_verify_xattr_datum(c, xd);
1277 if (rc < 0)
1278 continue;
1279 list_del_init(&xd->xindex);
1280 spin_lock(&c->erase_completion_lock);
1281 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
1282 if (ref_flags(raw) != REF_UNCHECKED)
1283 continue;
1284 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
1285 totlen = PAD(ref_totlen(c, jeb, raw));
1286 c->unchecked_size -= totlen; c->used_size += totlen;
1287 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
1288 raw->flash_offset = ref_offset(raw)
1289 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
1290 }
1291 if (xd->flags & JFFS2_XFLAGS_DEAD)
1292 list_add(&xd->xindex, &c->xattr_dead_list);
1293 spin_unlock(&c->erase_completion_lock);
1294 }
1295 up_write(&c->xattr_sem);
1296 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1297 }
1298
1299 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
1300 {
1301 /* must be called under spin_lock(&c->erase_completion_lock) */
1302 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd)
1303 return;
1304
1305 list_del(&xd->xindex);
1306 jffs2_free_xattr_datum(xd);
1307 }
1308
1309 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
1310 {
1311 /* must be called under spin_lock(&c->erase_completion_lock) */
1312 struct jffs2_xattr_ref *tmp, **ptmp;
1313
1314 if (ref->node != (void *)ref)
1315 return;
1316
1317 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
1318 if (ref == tmp) {
1319 *ptmp = tmp->next;
1320 break;
1321 }
1322 }
1323 jffs2_free_xattr_ref(ref);
1324 }
linux v2.6.22.y-op