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[NETFILTER]: nf_conntrack: Fix undefined references to local_bh_*
[linux-2.6/x86.git] / fs / jffs2 / xattr.c
blob18e66dbf23b497d456a191c75c9d7cb1b52edd65
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 * delete_xattr_datum(c, xd)
54 * is used to delete a xdatum. It marks xd JFFS2_XFLAGS_DEAD, and allows
55 * GC to reclaim those physical nodes.
56 * -------------------------------------------------- */
57 static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)
58 {
59 int name_len = strlen(xname);
60
61 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize);
62 }
63
64 static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
65 {
66 struct jffs2_raw_node_ref *raw;
67 int rc = 0;
68
69 spin_lock(&c->erase_completion_lock);
70 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
71 if (ref_flags(raw) == REF_UNCHECKED) {
72 rc = 1;
73 break;
74 }
75 }
76 spin_unlock(&c->erase_completion_lock);
77 return rc;
78 }
79
80 static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
81 {
82 /* must be called under down_write(xattr_sem) */
83 D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version));
84 if (xd->xname) {
85 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);
86 kfree(xd->xname);
87 }
88
89 list_del_init(&xd->xindex);
90 xd->hashkey = 0;
91 xd->xname = NULL;
92 xd->xvalue = NULL;
93 }
94
95 static void reclaim_xattr_datum(struct jffs2_sb_info *c)
96 {
97 /* must be called under down_write(xattr_sem) */
98 struct jffs2_xattr_datum *xd, *_xd;
99 uint32_t target, before;
100 static int index = 0;
101 int count;
102
103 if (c->xdatum_mem_threshold > c->xdatum_mem_usage)
104 return;
105
106 before = c->xdatum_mem_usage;
107 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */
108 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {
109 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {
110 if (xd->flags & JFFS2_XFLAGS_HOT) {
111 xd->flags &= ~JFFS2_XFLAGS_HOT;
112 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {
113 unload_xattr_datum(c, xd);
114 }
115 if (c->xdatum_mem_usage <= target)
116 goto out;
117 }
118 index = (index+1) % XATTRINDEX_HASHSIZE;
119 }
120 out:
121 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",
122 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
123 }
124
125 static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
126 {
127 /* must be called under down_write(xattr_sem) */
128 struct jffs2_eraseblock *jeb;
129 struct jffs2_raw_node_ref *raw;
130 struct jffs2_raw_xattr rx;
131 size_t readlen;
132 uint32_t crc, offset, totlen;
133 int rc;
134
135 spin_lock(&c->erase_completion_lock);
136 offset = ref_offset(xd->node);
137 if (ref_flags(xd->node) == REF_PRISTINE)
138 goto complete;
139 spin_unlock(&c->erase_completion_lock);
140
141 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx);
142 if (rc || readlen != sizeof(rx)) {
143 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
144 rc, sizeof(rx), readlen, offset);
145 return rc ? rc : -EIO;
146 }
147 crc = crc32(0, &rx, sizeof(rx) - 4);
148 if (crc != je32_to_cpu(rx.node_crc)) {
149 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
150 offset, je32_to_cpu(rx.hdr_crc), crc);
151 xd->flags |= JFFS2_XFLAGS_INVALID;
152 return EIO;
153 }
154 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len));
155 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK
156 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR
157 || je32_to_cpu(rx.totlen) != totlen
158 || je32_to_cpu(rx.xid) != xd->xid
159 || je32_to_cpu(rx.version) != xd->version) {
160 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "
161 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",
162 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
163 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,
164 je32_to_cpu(rx.totlen), totlen,
165 je32_to_cpu(rx.xid), xd->xid,
166 je32_to_cpu(rx.version), xd->version);
167 xd->flags |= JFFS2_XFLAGS_INVALID;
168 return EIO;
169 }
170 xd->xprefix = rx.xprefix;
171 xd->name_len = rx.name_len;
172 xd->value_len = je16_to_cpu(rx.value_len);
173 xd->data_crc = je32_to_cpu(rx.data_crc);
174
175 spin_lock(&c->erase_completion_lock);
176 complete:
177 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
178 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
179 totlen = PAD(ref_totlen(c, jeb, raw));
180 if (ref_flags(raw) == REF_UNCHECKED) {
181 c->unchecked_size -= totlen; c->used_size += totlen;
182 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
183 }
184 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL);
185 }
186 spin_unlock(&c->erase_completion_lock);
187
188 /* unchecked xdatum is chained with c->xattr_unchecked */
189 list_del_init(&xd->xindex);
190
191 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",
192 xd->xid, xd->version);
193
194 return 0;
195 }
196
197 static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
198 {
199 /* must be called under down_write(xattr_sem) */
200 char *data;
201 size_t readlen;
202 uint32_t crc, length;
203 int i, ret, retry = 0;
204
205 BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
206 BUG_ON(!list_empty(&xd->xindex));
207 retry:
208 length = xd->name_len + 1 + xd->value_len;
209 data = kmalloc(length, GFP_KERNEL);
210 if (!data)
211 return -ENOMEM;
212
213 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),
214 length, &readlen, data);
215
216 if (ret || length!=readlen) {
217 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n",
218 ret, length, readlen, ref_offset(xd->node));
219 kfree(data);
220 return ret ? ret : -EIO;
221 }
222
223 data[xd->name_len] = '\0';
224 crc = crc32(0, data, length);
225 if (crc != xd->data_crc) {
226 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)"
227 " at %#08x, read: 0x%08x calculated: 0x%08x\n",
228 ref_offset(xd->node), xd->data_crc, crc);
229 kfree(data);
230 xd->flags |= JFFS2_XFLAGS_INVALID;
231 return EIO;
232 }
233
234 xd->flags |= JFFS2_XFLAGS_HOT;
235 xd->xname = data;
236 xd->xvalue = data + xd->name_len+1;
237
238 c->xdatum_mem_usage += length;
239
240 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);
241 i = xd->hashkey % XATTRINDEX_HASHSIZE;
242 list_add(&xd->xindex, &c->xattrindex[i]);
243 if (!retry) {
244 retry = 1;
245 reclaim_xattr_datum(c);
246 if (!xd->xname)
247 goto retry;
248 }
249
250 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",
251 xd->xid, xd->xprefix, xd->xname);
252
253 return 0;
254 }
255
256 static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
257 {
258 /* must be called under down_write(xattr_sem);
259 * rc < 0 : recoverable error, try again
260 * rc = 0 : success
261 * rc > 0 : Unrecoverable error, this node should be deleted.
262 */
263 int rc = 0;
264
265 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);
266 if (xd->xname)
267 return 0;
268 if (xd->flags & JFFS2_XFLAGS_INVALID)
269 return EIO;
270 if (unlikely(is_xattr_datum_unchecked(c, xd)))
271 rc = do_verify_xattr_datum(c, xd);
272 if (!rc)
273 rc = do_load_xattr_datum(c, xd);
274 return rc;
275 }
276
277 static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
278 {
279 /* must be called under down_write(xattr_sem) */
280 struct jffs2_raw_xattr rx;
281 struct kvec vecs[2];
282 size_t length;
283 int rc, totlen;
284 uint32_t phys_ofs = write_ofs(c);
285
286 BUG_ON(!xd->xname);
287 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID));
288
289 vecs[0].iov_base = &rx;
290 vecs[0].iov_len = sizeof(rx);
291 vecs[1].iov_base = xd->xname;
292 vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
293 totlen = vecs[0].iov_len + vecs[1].iov_len;
294
295 /* Setup raw-xattr */
296 memset(&rx, 0, sizeof(rx));
297 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
298 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
299 rx.totlen = cpu_to_je32(PAD(totlen));
300 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
301
302 rx.xid = cpu_to_je32(xd->xid);
303 rx.version = cpu_to_je32(++xd->version);
304 rx.xprefix = xd->xprefix;
305 rx.name_len = xd->name_len;
306 rx.value_len = cpu_to_je16(xd->value_len);
307 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
308 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
309
310 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);
311 if (rc || totlen != length) {
312 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",
313 rc, totlen, length, phys_ofs);
314 rc = rc ? rc : -EIO;
315 if (length)
316 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);
317
318 return rc;
319 }
320 /* success */
321 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd);
322
323 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
324 xd->xid, xd->version, xd->xprefix, xd->xname);
325
326 return 0;
327 }
328
329 static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
330 int xprefix, const char *xname,
331 const char *xvalue, int xsize)
332 {
333 /* must be called under down_write(xattr_sem) */
334 struct jffs2_xattr_datum *xd;
335 uint32_t hashkey, name_len;
336 char *data;
337 int i, rc;
338
339 /* Search xattr_datum has same xname/xvalue by index */
340 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
341 i = hashkey % XATTRINDEX_HASHSIZE;
342 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
343 if (xd->hashkey==hashkey
344 && xd->xprefix==xprefix
345 && xd->value_len==xsize
346 && !strcmp(xd->xname, xname)
347 && !memcmp(xd->xvalue, xvalue, xsize)) {
348 atomic_inc(&xd->refcnt);
349 return xd;
350 }
351 }
352
353 /* Not found, Create NEW XATTR-Cache */
354 name_len = strlen(xname);
355
356 xd = jffs2_alloc_xattr_datum();
357 if (!xd)
358 return ERR_PTR(-ENOMEM);
359
360 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
361 if (!data) {
362 jffs2_free_xattr_datum(xd);
363 return ERR_PTR(-ENOMEM);
364 }
365 strcpy(data, xname);
366 memcpy(data + name_len + 1, xvalue, xsize);
367
368 atomic_set(&xd->refcnt, 1);
369 xd->xid = ++c->highest_xid;
370 xd->flags |= JFFS2_XFLAGS_HOT;
371 xd->xprefix = xprefix;
372
373 xd->hashkey = hashkey;
374 xd->xname = data;
375 xd->xvalue = data + name_len + 1;
376 xd->name_len = name_len;
377 xd->value_len = xsize;
378 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
379
380 rc = save_xattr_datum(c, xd);
381 if (rc) {
382 kfree(xd->xname);
383 jffs2_free_xattr_datum(xd);
384 return ERR_PTR(rc);
385 }
386
387 /* Insert Hash Index */
388 i = hashkey % XATTRINDEX_HASHSIZE;
389 list_add(&xd->xindex, &c->xattrindex[i]);
390
391 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
392 reclaim_xattr_datum(c);
393
394 return xd;
395 }
396
397 static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
398 {
399 /* must be called under down_write(xattr_sem) */
400 BUG_ON(atomic_read(&xd->refcnt));
401
402 unload_xattr_datum(c, xd);
403 xd->flags |= JFFS2_XFLAGS_DEAD;
404 spin_lock(&c->erase_completion_lock);
405 if (xd->node == (void *)xd) {
406 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID));
407 jffs2_free_xattr_datum(xd);
408 } else {
409 list_add(&xd->xindex, &c->xattr_dead_list);
410 }
411 spin_unlock(&c->erase_completion_lock);
412 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", xd->xid, xd->version);
413 }
414
415 /* -------- xref related functions ------------------
416 * verify_xattr_ref(c, ref)
417 * is used to load xref information from medium. Because summary data does not
418 * contain xid/ino, it's necessary to verify once while mounting process.
419 * save_xattr_ref(c, ref)
420 * is used to write xref to medium. If delete marker is marked, it write
421 * a delete marker of xref into medium.
422 * create_xattr_ref(c, ic, xd)
423 * is used to create a new xref and write to medium.
424 * delete_xattr_ref(c, ref)
425 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER,
426 * and allows GC to reclaim those physical nodes.
427 * jffs2_xattr_delete_inode(c, ic)
428 * is called to remove xrefs related to obsolete inode when inode is unlinked.
429 * jffs2_xattr_free_inode(c, ic)
430 * is called to release xattr related objects when unmounting.
431 * check_xattr_ref_inode(c, ic)
432 * is used to confirm inode does not have duplicate xattr name/value pair.
433 * -------------------------------------------------- */
434 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
435 {
436 struct jffs2_eraseblock *jeb;
437 struct jffs2_raw_node_ref *raw;
438 struct jffs2_raw_xref rr;
439 size_t readlen;
440 uint32_t crc, offset, totlen;
441 int rc;
442
443 spin_lock(&c->erase_completion_lock);
444 if (ref_flags(ref->node) != REF_UNCHECKED)
445 goto complete;
446 offset = ref_offset(ref->node);
447 spin_unlock(&c->erase_completion_lock);
448
449 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);
450 if (rc || sizeof(rr) != readlen) {
451 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
452 rc, sizeof(rr), readlen, offset);
453 return rc ? rc : -EIO;
454 }
455 /* obsolete node */
456 crc = crc32(0, &rr, sizeof(rr) - 4);
457 if (crc != je32_to_cpu(rr.node_crc)) {
458 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
459 offset, je32_to_cpu(rr.node_crc), crc);
460 return EIO;
461 }
462 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
463 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
464 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
465 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
466 "nodetype=%#04x/%#04x, totlen=%u/%zu\n",
467 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
468 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
469 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
470 return EIO;
471 }
472 ref->ino = je32_to_cpu(rr.ino);
473 ref->xid = je32_to_cpu(rr.xid);
474 ref->xseqno = je32_to_cpu(rr.xseqno);
475 if (ref->xseqno > c->highest_xseqno)
476 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
477
478 spin_lock(&c->erase_completion_lock);
479 complete:
480 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {
481 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
482 totlen = PAD(ref_totlen(c, jeb, raw));
483 if (ref_flags(raw) == REF_UNCHECKED) {
484 c->unchecked_size -= totlen; c->used_size += totlen;
485 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
486 }
487 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);
488 }
489 spin_unlock(&c->erase_completion_lock);
490
491 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
492 ref->ino, ref->xid, ref_offset(ref->node));
493 return 0;
494 }
495
496 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
497 {
498 /* must be called under down_write(xattr_sem) */
499 struct jffs2_raw_xref rr;
500 size_t length;
501 uint32_t xseqno, phys_ofs = write_ofs(c);
502 int ret;
503
504 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
505 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
506 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
507 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
508
509 xseqno = (c->highest_xseqno += 2);
510 if (is_xattr_ref_dead(ref)) {
511 xseqno |= XREF_DELETE_MARKER;
512 rr.ino = cpu_to_je32(ref->ino);
513 rr.xid = cpu_to_je32(ref->xid);
514 } else {
515 rr.ino = cpu_to_je32(ref->ic->ino);
516 rr.xid = cpu_to_je32(ref->xd->xid);
517 }
518 rr.xseqno = cpu_to_je32(xseqno);
519 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
520
521 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
522 if (ret || sizeof(rr) != length) {
523 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
524 ret, sizeof(rr), length, phys_ofs);
525 ret = ret ? ret : -EIO;
526 if (length)
527 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
528
529 return ret;
530 }
531 /* success */
532 ref->xseqno = xseqno;
533 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);
534
535 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
536
537 return 0;
538 }
539
540 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
541 struct jffs2_xattr_datum *xd)
542 {
543 /* must be called under down_write(xattr_sem) */
544 struct jffs2_xattr_ref *ref;
545 int ret;
546
547 ref = jffs2_alloc_xattr_ref();
548 if (!ref)
549 return ERR_PTR(-ENOMEM);
550 ref->ic = ic;
551 ref->xd = xd;
552
553 ret = save_xattr_ref(c, ref);
554 if (ret) {
555 jffs2_free_xattr_ref(ref);
556 return ERR_PTR(ret);
557 }
558
559 /* Chain to inode */
560 ref->next = ic->xref;
561 ic->xref = ref;
562
563 return ref; /* success */
564 }
565
566 static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
567 {
568 /* must be called under down_write(xattr_sem) */
569 struct jffs2_xattr_datum *xd;
570
571 xd = ref->xd;
572 ref->xseqno |= XREF_DELETE_MARKER;
573 ref->ino = ref->ic->ino;
574 ref->xid = ref->xd->xid;
575 spin_lock(&c->erase_completion_lock);
576 ref->next = c->xref_dead_list;
577 c->xref_dead_list = ref;
578 spin_unlock(&c->erase_completion_lock);
579
580 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
581 ref->ino, ref->xid, ref->xseqno);
582
583 if (atomic_dec_and_test(&xd->refcnt))
584 delete_xattr_datum(c, xd);
585 }
586
587 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
588 {
589 /* It's called from jffs2_clear_inode() on inode removing.
590 When an inode with XATTR is removed, those XATTRs must be removed. */
591 struct jffs2_xattr_ref *ref, *_ref;
592
593 if (!ic || ic->nlink > 0)
594 return;
595
596 down_write(&c->xattr_sem);
597 for (ref = ic->xref; ref; ref = _ref) {
598 _ref = ref->next;
599 delete_xattr_ref(c, ref);
600 }
601 ic->xref = NULL;
602 up_write(&c->xattr_sem);
603 }
604
605 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
606 {
607 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
608 struct jffs2_xattr_datum *xd;
609 struct jffs2_xattr_ref *ref, *_ref;
610
611 down_write(&c->xattr_sem);
612 for (ref = ic->xref; ref; ref = _ref) {
613 _ref = ref->next;
614 xd = ref->xd;
615 if (atomic_dec_and_test(&xd->refcnt)) {
616 unload_xattr_datum(c, xd);
617 jffs2_free_xattr_datum(xd);
618 }
619 jffs2_free_xattr_ref(ref);
620 }
621 ic->xref = NULL;
622 up_write(&c->xattr_sem);
623 }
624
625 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
626 {
627 /* success of check_xattr_ref_inode() means taht inode (ic) dose not have
628 * duplicate name/value pairs. If duplicate name/value pair would be found,
629 * one will be removed.
630 */
631 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
632 int rc = 0;
633
634 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
635 return 0;
636 down_write(&c->xattr_sem);
637 retry:
638 rc = 0;
639 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
640 if (!ref->xd->xname) {
641 rc = load_xattr_datum(c, ref->xd);
642 if (unlikely(rc > 0)) {
643 *pref = ref->next;
644 delete_xattr_ref(c, ref);
645 goto retry;
646 } else if (unlikely(rc < 0))
647 goto out;
648 }
649 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
650 if (!cmp->xd->xname) {
651 ref->xd->flags |= JFFS2_XFLAGS_BIND;
652 rc = load_xattr_datum(c, cmp->xd);
653 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
654 if (unlikely(rc > 0)) {
655 *pcmp = cmp->next;
656 delete_xattr_ref(c, cmp);
657 goto retry;
658 } else if (unlikely(rc < 0))
659 goto out;
660 }
661 if (ref->xd->xprefix == cmp->xd->xprefix
662 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
663 if (ref->xseqno > cmp->xseqno) {
664 *pcmp = cmp->next;
665 delete_xattr_ref(c, cmp);
666 } else {
667 *pref = ref->next;
668 delete_xattr_ref(c, ref);
669 }
670 goto retry;
671 }
672 }
673 }
674 ic->flags |= INO_FLAGS_XATTR_CHECKED;
675 out:
676 up_write(&c->xattr_sem);
677
678 return rc;
679 }
680
681 /* -------- xattr subsystem functions ---------------
682 * jffs2_init_xattr_subsystem(c)
683 * is used to initialize semaphore and list_head, and some variables.
684 * jffs2_find_xattr_datum(c, xid)
685 * is used to lookup xdatum while scanning process.
686 * jffs2_clear_xattr_subsystem(c)
687 * is used to release any xattr related objects.
688 * jffs2_build_xattr_subsystem(c)
689 * is used to associate xdatum and xref while super block building process.
690 * jffs2_setup_xattr_datum(c, xid, version)
691 * is used to insert xdatum while scanning process.
692 * -------------------------------------------------- */
693 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
694 {
695 int i;
696
697 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
698 INIT_LIST_HEAD(&c->xattrindex[i]);
699 INIT_LIST_HEAD(&c->xattr_unchecked);
700 INIT_LIST_HEAD(&c->xattr_dead_list);
701 c->xref_dead_list = NULL;
702 c->xref_temp = NULL;
703
704 init_rwsem(&c->xattr_sem);
705 c->highest_xid = 0;
706 c->highest_xseqno = 0;
707 c->xdatum_mem_usage = 0;
708 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
709 }
710
711 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
712 {
713 struct jffs2_xattr_datum *xd;
714 int i = xid % XATTRINDEX_HASHSIZE;
715
716 /* It's only used in scanning/building process. */
717 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
718
719 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
720 if (xd->xid==xid)
721 return xd;
722 }
723 return NULL;
724 }
725
726 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
727 {
728 struct jffs2_xattr_datum *xd, *_xd;
729 struct jffs2_xattr_ref *ref, *_ref;
730 int i;
731
732 for (ref=c->xref_temp; ref; ref = _ref) {
733 _ref = ref->next;
734 jffs2_free_xattr_ref(ref);
735 }
736
737 for (ref=c->xref_dead_list; ref; ref = _ref) {
738 _ref = ref->next;
739 jffs2_free_xattr_ref(ref);
740 }
741
742 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
743 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
744 list_del(&xd->xindex);
745 if (xd->xname)
746 kfree(xd->xname);
747 jffs2_free_xattr_datum(xd);
748 }
749 }
750
751 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
752 list_del(&xd->xindex);
753 jffs2_free_xattr_datum(xd);
754 }
755 }
756
757 #define XREF_TMPHASH_SIZE (128)
758 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
759 {
760 struct jffs2_xattr_ref *ref, *_ref;
761 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
762 struct jffs2_xattr_datum *xd, *_xd;
763 struct jffs2_inode_cache *ic;
764 struct jffs2_raw_node_ref *raw;
765 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
766 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0;
767
768 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
769
770 /* Phase.1 : Merge same xref */
771 for (i=0; i < XREF_TMPHASH_SIZE; i++)
772 xref_tmphash[i] = NULL;
773 for (ref=c->xref_temp; ref; ref=_ref) {
774 struct jffs2_xattr_ref *tmp;
775
776 _ref = ref->next;
777 if (ref_flags(ref->node) != REF_PRISTINE) {
778 if (verify_xattr_ref(c, ref)) {
779 BUG_ON(ref->node->next_in_ino != (void *)ref);
780 ref->node->next_in_ino = NULL;
781 jffs2_mark_node_obsolete(c, ref->node);
782 jffs2_free_xattr_ref(ref);
783 continue;
784 }
785 }
786
787 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
788 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
789 if (tmp->ino == ref->ino && tmp->xid == ref->xid)
790 break;
791 }
792 if (tmp) {
793 raw = ref->node;
794 if (ref->xseqno > tmp->xseqno) {
795 tmp->xseqno = ref->xseqno;
796 raw->next_in_ino = tmp->node;
797 tmp->node = raw;
798 } else {
799 raw->next_in_ino = tmp->node->next_in_ino;
800 tmp->node->next_in_ino = raw;
801 }
802 jffs2_free_xattr_ref(ref);
803 continue;
804 } else {
805 ref->next = xref_tmphash[i];
806 xref_tmphash[i] = ref;
807 }
808 }
809 c->xref_temp = NULL;
810
811 /* Phase.2 : Bind xref with inode_cache and xattr_datum */
812 for (i=0; i < XREF_TMPHASH_SIZE; i++) {
813 for (ref=xref_tmphash[i]; ref; ref=_ref) {
814 xref_count++;
815 _ref = ref->next;
816 if (is_xattr_ref_dead(ref)) {
817 ref->next = c->xref_dead_list;
818 c->xref_dead_list = ref;
819 xref_dead_count++;
820 continue;
821 }
822 /* At this point, ref->xid and ref->ino contain XID and inode number.
823 ref->xd and ref->ic are not valid yet. */
824 xd = jffs2_find_xattr_datum(c, ref->xid);
825 ic = jffs2_get_ino_cache(c, ref->ino);
826 if (!xd || !ic) {
827 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n",
828 ref->ino, ref->xid, ref->xseqno);
829 ref->xseqno |= XREF_DELETE_MARKER;
830 ref->next = c->xref_dead_list;
831 c->xref_dead_list = ref;
832 xref_orphan_count++;
833 continue;
834 }
835 ref->xd = xd;
836 ref->ic = ic;
837 atomic_inc(&xd->refcnt);
838 ref->next = ic->xref;
839 ic->xref = ref;
840 }
841 }
842
843 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */
844 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
845 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
846 xdatum_count++;
847 list_del_init(&xd->xindex);
848 if (!atomic_read(&xd->refcnt)) {
849 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n",
850 xd->xid, xd->version);
851 xd->flags |= JFFS2_XFLAGS_DEAD;
852 list_add(&xd->xindex, &c->xattr_unchecked);
853 xdatum_orphan_count++;
854 continue;
855 }
856 if (is_xattr_datum_unchecked(c, xd)) {
857 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
858 xd->xid, xd->version);
859 list_add(&xd->xindex, &c->xattr_unchecked);
860 xdatum_unchecked_count++;
861 }
862 }
863 }
864 /* build complete */
865 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum"
866 " (%u unchecked, %u orphan) and "
867 "%u of xref (%u dead, %u orphan) found.\n",
868 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
869 xref_count, xref_dead_count, xref_orphan_count);
870 }
871
872 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
873 uint32_t xid, uint32_t version)
874 {
875 struct jffs2_xattr_datum *xd;
876
877 xd = jffs2_find_xattr_datum(c, xid);
878 if (!xd) {
879 xd = jffs2_alloc_xattr_datum();
880 if (!xd)
881 return ERR_PTR(-ENOMEM);
882 xd->xid = xid;
883 xd->version = version;
884 if (xd->xid > c->highest_xid)
885 c->highest_xid = xd->xid;
886 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
887 }
888 return xd;
889 }
890
891 /* -------- xattr subsystem functions ---------------
892 * xprefix_to_handler(xprefix)
893 * is used to translate xprefix into xattr_handler.
894 * jffs2_listxattr(dentry, buffer, size)
895 * is an implementation of listxattr handler on jffs2.
896 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
897 * is an implementation of getxattr handler on jffs2.
898 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
899 * is an implementation of setxattr handler on jffs2.
900 * -------------------------------------------------- */
901 struct xattr_handler *jffs2_xattr_handlers[] = {
902 &jffs2_user_xattr_handler,
903 #ifdef CONFIG_JFFS2_FS_SECURITY
904 &jffs2_security_xattr_handler,
905 #endif
906 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
907 &jffs2_acl_access_xattr_handler,
908 &jffs2_acl_default_xattr_handler,
909 #endif
910 &jffs2_trusted_xattr_handler,
911 NULL
912 };
913
914 static struct xattr_handler *xprefix_to_handler(int xprefix) {
915 struct xattr_handler *ret;
916
917 switch (xprefix) {
918 case JFFS2_XPREFIX_USER:
919 ret = &jffs2_user_xattr_handler;
920 break;
921 #ifdef CONFIG_JFFS2_FS_SECURITY
922 case JFFS2_XPREFIX_SECURITY:
923 ret = &jffs2_security_xattr_handler;
924 break;
925 #endif
926 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
927 case JFFS2_XPREFIX_ACL_ACCESS:
928 ret = &jffs2_acl_access_xattr_handler;
929 break;
930 case JFFS2_XPREFIX_ACL_DEFAULT:
931 ret = &jffs2_acl_default_xattr_handler;
932 break;
933 #endif
934 case JFFS2_XPREFIX_TRUSTED:
935 ret = &jffs2_trusted_xattr_handler;
936 break;
937 default:
938 ret = NULL;
939 break;
940 }
941 return ret;
942 }
943
944 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
945 {
946 struct inode *inode = dentry->d_inode;
947 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
948 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
949 struct jffs2_inode_cache *ic = f->inocache;
950 struct jffs2_xattr_ref *ref, **pref;
951 struct jffs2_xattr_datum *xd;
952 struct xattr_handler *xhandle;
953 ssize_t len, rc;
954 int retry = 0;
955
956 rc = check_xattr_ref_inode(c, ic);
957 if (unlikely(rc))
958 return rc;
959
960 down_read(&c->xattr_sem);
961 retry:
962 len = 0;
963 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
964 BUG_ON(ref->ic != ic);
965 xd = ref->xd;
966 if (!xd->xname) {
967 /* xdatum is unchached */
968 if (!retry) {
969 retry = 1;
970 up_read(&c->xattr_sem);
971 down_write(&c->xattr_sem);
972 goto retry;
973 } else {
974 rc = load_xattr_datum(c, xd);
975 if (unlikely(rc > 0)) {
976 *pref = ref->next;
977 delete_xattr_ref(c, ref);
978 goto retry;
979 } else if (unlikely(rc < 0))
980 goto out;
981 }
982 }
983 xhandle = xprefix_to_handler(xd->xprefix);
984 if (!xhandle)
985 continue;
986 if (buffer) {
987 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
988 } else {
989 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
990 }
991 if (rc < 0)
992 goto out;
993 len += rc;
994 }
995 rc = len;
996 out:
997 if (!retry) {
998 up_read(&c->xattr_sem);
999 } else {
1000 up_write(&c->xattr_sem);
1001 }
1002 return rc;
1003 }
1004
1005 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
1006 char *buffer, size_t size)
1007 {
1008 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1009 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1010 struct jffs2_inode_cache *ic = f->inocache;
1011 struct jffs2_xattr_datum *xd;
1012 struct jffs2_xattr_ref *ref, **pref;
1013 int rc, retry = 0;
1014
1015 rc = check_xattr_ref_inode(c, ic);
1016 if (unlikely(rc))
1017 return rc;
1018
1019 down_read(&c->xattr_sem);
1020 retry:
1021 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1022 BUG_ON(ref->ic!=ic);
1023
1024 xd = ref->xd;
1025 if (xd->xprefix != xprefix)
1026 continue;
1027 if (!xd->xname) {
1028 /* xdatum is unchached */
1029 if (!retry) {
1030 retry = 1;
1031 up_read(&c->xattr_sem);
1032 down_write(&c->xattr_sem);
1033 goto retry;
1034 } else {
1035 rc = load_xattr_datum(c, xd);
1036 if (unlikely(rc > 0)) {
1037 *pref = ref->next;
1038 delete_xattr_ref(c, ref);
1039 goto retry;
1040 } else if (unlikely(rc < 0)) {
1041 goto out;
1042 }
1043 }
1044 }
1045 if (!strcmp(xname, xd->xname)) {
1046 rc = xd->value_len;
1047 if (buffer) {
1048 if (size < rc) {
1049 rc = -ERANGE;
1050 } else {
1051 memcpy(buffer, xd->xvalue, rc);
1052 }
1053 }
1054 goto out;
1055 }
1056 }
1057 rc = -ENODATA;
1058 out:
1059 if (!retry) {
1060 up_read(&c->xattr_sem);
1061 } else {
1062 up_write(&c->xattr_sem);
1063 }
1064 return rc;
1065 }
1066
1067 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1068 const char *buffer, size_t size, int flags)
1069 {
1070 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1071 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1072 struct jffs2_inode_cache *ic = f->inocache;
1073 struct jffs2_xattr_datum *xd;
1074 struct jffs2_xattr_ref *ref, *newref, **pref;
1075 uint32_t length, request;
1076 int rc;
1077
1078 rc = check_xattr_ref_inode(c, ic);
1079 if (unlikely(rc))
1080 return rc;
1081
1082 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1083 rc = jffs2_reserve_space(c, request, &length,
1084 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1085 if (rc) {
1086 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1087 return rc;
1088 }
1089
1090 /* Find existing xattr */
1091 down_write(&c->xattr_sem);
1092 retry:
1093 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1094 xd = ref->xd;
1095 if (xd->xprefix != xprefix)
1096 continue;
1097 if (!xd->xname) {
1098 rc = load_xattr_datum(c, xd);
1099 if (unlikely(rc > 0)) {
1100 *pref = ref->next;
1101 delete_xattr_ref(c, ref);
1102 goto retry;
1103 } else if (unlikely(rc < 0))
1104 goto out;
1105 }
1106 if (!strcmp(xd->xname, xname)) {
1107 if (flags & XATTR_CREATE) {
1108 rc = -EEXIST;
1109 goto out;
1110 }
1111 if (!buffer) {
1112 ref->ino = ic->ino;
1113 ref->xid = xd->xid;
1114 ref->xseqno |= XREF_DELETE_MARKER;
1115 rc = save_xattr_ref(c, ref);
1116 if (!rc) {
1117 *pref = ref->next;
1118 spin_lock(&c->erase_completion_lock);
1119 ref->next = c->xref_dead_list;
1120 c->xref_dead_list = ref;
1121 spin_unlock(&c->erase_completion_lock);
1122 if (atomic_dec_and_test(&xd->refcnt))
1123 delete_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 if (atomic_dec_and_test(&xd->refcnt))
1160 delete_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 if (atomic_dec_and_test(&xd->refcnt))
1174 delete_xattr_datum(c, xd);
1175 } else if (ref) {
1176 delete_xattr_ref(c, ref);
1177 }
1178 out:
1179 up_write(&c->xattr_sem);
1180 jffs2_complete_reservation(c);
1181 return rc;
1182 }
1183
1184 /* -------- garbage collector functions -------------
1185 * jffs2_garbage_collect_xattr_datum(c, xd, raw)
1186 * is used to move xdatum into new node.
1187 * jffs2_garbage_collect_xattr_ref(c, ref, raw)
1188 * is used to move xref into new node.
1189 * jffs2_verify_xattr(c)
1190 * is used to call do_verify_xattr_datum() before garbage collecting.
1191 * jffs2_release_xattr_datum(c, xd)
1192 * is used to release an in-memory object of xdatum.
1193 * jffs2_release_xattr_ref(c, ref)
1194 * is used to release an in-memory object of xref.
1195 * -------------------------------------------------- */
1196 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
1197 struct jffs2_raw_node_ref *raw)
1198 {
1199 uint32_t totlen, length, old_ofs;
1200 int rc = 0;
1201
1202 down_write(&c->xattr_sem);
1203 if (xd->node != raw)
1204 goto out;
1205 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
1206 goto out;
1207
1208 rc = load_xattr_datum(c, xd);
1209 if (unlikely(rc)) {
1210 rc = (rc > 0) ? 0 : rc;
1211 goto out;
1212 }
1213 old_ofs = ref_offset(xd->node);
1214 totlen = PAD(sizeof(struct jffs2_raw_xattr)
1215 + xd->name_len + 1 + xd->value_len);
1216 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
1217 if (rc) {
1218 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
1219 rc = rc ? rc : -EBADFD;
1220 goto out;
1221 }
1222 rc = save_xattr_datum(c, xd);
1223 if (!rc)
1224 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1225 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1226 out:
1227 if (!rc)
1228 jffs2_mark_node_obsolete(c, raw);
1229 up_write(&c->xattr_sem);
1230 return rc;
1231 }
1232
1233 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
1234 struct jffs2_raw_node_ref *raw)
1235 {
1236 uint32_t totlen, length, old_ofs;
1237 int rc = 0;
1238
1239 down_write(&c->xattr_sem);
1240 BUG_ON(!ref->node);
1241
1242 if (ref->node != raw)
1243 goto out;
1244 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
1245 goto out;
1246
1247 old_ofs = ref_offset(ref->node);
1248 totlen = ref_totlen(c, c->gcblock, ref->node);
1249
1250 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
1251 if (rc) {
1252 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
1253 __FUNCTION__, rc, totlen);
1254 rc = rc ? rc : -EBADFD;
1255 goto out;
1256 }
1257 rc = save_xattr_ref(c, ref);
1258 if (!rc)
1259 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1260 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1261 out:
1262 if (!rc)
1263 jffs2_mark_node_obsolete(c, raw);
1264 up_write(&c->xattr_sem);
1265 return rc;
1266 }
1267
1268 int jffs2_verify_xattr(struct jffs2_sb_info *c)
1269 {
1270 struct jffs2_xattr_datum *xd, *_xd;
1271 struct jffs2_eraseblock *jeb;
1272 struct jffs2_raw_node_ref *raw;
1273 uint32_t totlen;
1274 int rc;
1275
1276 down_write(&c->xattr_sem);
1277 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1278 rc = do_verify_xattr_datum(c, xd);
1279 if (rc < 0)
1280 continue;
1281 list_del_init(&xd->xindex);
1282 spin_lock(&c->erase_completion_lock);
1283 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
1284 if (ref_flags(raw) != REF_UNCHECKED)
1285 continue;
1286 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
1287 totlen = PAD(ref_totlen(c, jeb, raw));
1288 c->unchecked_size -= totlen; c->used_size += totlen;
1289 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
1290 raw->flash_offset = ref_offset(raw)
1291 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
1292 }
1293 if (xd->flags & JFFS2_XFLAGS_DEAD)
1294 list_add(&xd->xindex, &c->xattr_dead_list);
1295 spin_unlock(&c->erase_completion_lock);
1296 }
1297 up_write(&c->xattr_sem);
1298 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1299 }
1300
1301 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
1302 {
1303 /* must be called under spin_lock(&c->erase_completion_lock) */
1304 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd)
1305 return;
1306
1307 list_del(&xd->xindex);
1308 jffs2_free_xattr_datum(xd);
1309 }
1310
1311 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
1312 {
1313 /* must be called under spin_lock(&c->erase_completion_lock) */
1314 struct jffs2_xattr_ref *tmp, **ptmp;
1315
1316 if (ref->node != (void *)ref)
1317 return;
1318
1319 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
1320 if (ref == tmp) {
1321 *ptmp = tmp->next;
1322 break;
1323 }
1324 }
1325 jffs2_free_xattr_ref(ref);
1326 }
x86 "subsystem" repository