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-rw-r--r--fs/jffs2/xattr.c1271
1 files changed, 1271 insertions, 0 deletions
diff --git a/fs/jffs2/xattr.c b/fs/jffs2/xattr.c
new file mode 100644
index 000000000000..c9a185c54ce7
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+++ b/fs/jffs2/xattr.c
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1/* -------------------------------------------------------------------------
2 * File: fs/jffs2/xattr.c
3 * XATTR support on JFFS2 FileSystem
4 *
5 * Implemented by KaiGai Kohei <kaigai@ak.jp.nec.com>
6 * Copyright (C) 2006 NEC Corporation
7 *
8 * For licensing information, see the file 'LICENCE' in the jffs2 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 * unload_xattr_datum(c, xd)
27 * is used to release xattr name/value pair and detach from c->xattrindex.
28 * reclaim_xattr_datum(c)
29 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when
30 * memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold
31 * is hard coded as 32KiB.
32 * delete_xattr_datum_node(c, xd)
33 * is used to delete a jffs2 node is dominated by xdatum. When EBS(Erase Block Summary) is
34 * enabled, it overwrites the obsolete node by myself.
35 * delete_xattr_datum(c, xd)
36 * is used to delete jffs2_xattr_datum object. It must be called with 0-value of reference
37 * counter. (It means how many jffs2_xattr_ref object refers this xdatum.)
38 * do_verify_xattr_datum(c, xd)
39 * is used to load the xdatum informations without name/value pair from the medium.
40 * It's necessary once, because those informations are not collected during mounting
41 * process when EBS is enabled.
42 * 0 will be returned, if success. An negative return value means recoverable error, and
43 * positive return value means unrecoverable error. Thus, caller must remove this xdatum
44 * and xref when it returned positive value.
45 * do_load_xattr_datum(c, xd)
46 * is used to load name/value pair from the medium.
47 * The meanings of return value is same as do_verify_xattr_datum().
48 * load_xattr_datum(c, xd)
49 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum().
50 * If xd need to call do_verify_xattr_datum() at first, it's called before calling
51 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum().
52 * save_xattr_datum(c, xd, phys_ofs)
53 * is used to write xdatum to medium. xd->version will be incremented.
54 * create_xattr_datum(c, xprefix, xname, xvalue, xsize, phys_ofs)
55 * is used to create new xdatum and write to medium.
56 * -------------------------------------------------- */
57
58static 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
65static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
66{
67 /* must be called under down_write(xattr_sem) */
68 D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version));
69 if (xd->xname) {
70 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);
71 kfree(xd->xname);
72 }
73
74 list_del_init(&xd->xindex);
75 xd->hashkey = 0;
76 xd->xname = NULL;
77 xd->xvalue = NULL;
78}
79
80static void reclaim_xattr_datum(struct jffs2_sb_info *c)
81{
82 /* must be called under down_write(xattr_sem) */
83 struct jffs2_xattr_datum *xd, *_xd;
84 uint32_t target, before;
85 static int index = 0;
86 int count;
87
88 if (c->xdatum_mem_threshold > c->xdatum_mem_usage)
89 return;
90
91 before = c->xdatum_mem_usage;
92 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */
93 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {
94 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {
95 if (xd->flags & JFFS2_XFLAGS_HOT) {
96 xd->flags &= ~JFFS2_XFLAGS_HOT;
97 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {
98 unload_xattr_datum(c, xd);
99 }
100 if (c->xdatum_mem_usage <= target)
101 goto out;
102 }
103 index = (index+1) % XATTRINDEX_HASHSIZE;
104 }
105 out:
106 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",
107 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
108}
109
110static void delete_xattr_datum_node(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
111{
112 /* must be called under down_write(xattr_sem) */
113 struct jffs2_raw_xattr rx;
114 uint32_t length;
115 int rc;
116
117 if (!xd->node) {
118 JFFS2_WARNING("xdatum (xid=%u) is removed twice.\n", xd->xid);
119 return;
120 }
121 if (jffs2_sum_active()) {
122 memset(&rx, 0xff, sizeof(struct jffs2_raw_xattr));
123 rc = jffs2_flash_read(c, ref_offset(xd->node),
124 sizeof(struct jffs2_unknown_node),
125 &length, (char *)&rx);
126 if (rc || length != sizeof(struct jffs2_unknown_node)) {
127 JFFS2_ERROR("jffs2_flash_read()=%d, req=%u, read=%u at %#08x\n",
128 rc, sizeof(struct jffs2_unknown_node),
129 length, ref_offset(xd->node));
130 }
131 rc = jffs2_flash_write(c, ref_offset(xd->node), sizeof(rx),
132 &length, (char *)&rx);
133 if (rc || length != sizeof(struct jffs2_raw_xattr)) {
134 JFFS2_ERROR("jffs2_flash_write()=%d, req=%u, wrote=%u ar %#08x\n",
135 rc, sizeof(rx), length, ref_offset(xd->node));
136 }
137 }
138 spin_lock(&c->erase_completion_lock);
139 xd->node->next_in_ino = NULL;
140 spin_unlock(&c->erase_completion_lock);
141 jffs2_mark_node_obsolete(c, xd->node);
142 xd->node = NULL;
143}
144
145static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
146{
147 /* must be called under down_write(xattr_sem) */
148 BUG_ON(xd->refcnt);
149
150 unload_xattr_datum(c, xd);
151 if (xd->node) {
152 delete_xattr_datum_node(c, xd);
153 xd->node = NULL;
154 }
155 jffs2_free_xattr_datum(xd);
156}
157
158static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
159{
160 /* must be called under down_write(xattr_sem) */
161 struct jffs2_eraseblock *jeb;
162 struct jffs2_raw_xattr rx;
163 size_t readlen;
164 uint32_t crc, totlen;
165 int rc;
166
167 BUG_ON(!xd->node);
168 BUG_ON(ref_flags(xd->node) != REF_UNCHECKED);
169
170 rc = jffs2_flash_read(c, ref_offset(xd->node), sizeof(rx), &readlen, (char *)&rx);
171 if (rc || readlen != sizeof(rx)) {
172 JFFS2_WARNING("jffs2_flash_read()=%d, req=%u, read=%u at %#08x\n",
173 rc, sizeof(rx), readlen, ref_offset(xd->node));
174 return rc ? rc : -EIO;
175 }
176 crc = crc32(0, &rx, sizeof(rx) - 4);
177 if (crc != je32_to_cpu(rx.node_crc)) {
178 if (je32_to_cpu(rx.node_crc) != 0xffffffff)
179 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
180 ref_offset(xd->node), je32_to_cpu(rx.hdr_crc), crc);
181 return EIO;
182 }
183 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len));
184 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK
185 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR
186 || je32_to_cpu(rx.totlen) != totlen
187 || je32_to_cpu(rx.xid) != xd->xid
188 || je32_to_cpu(rx.version) != xd->version) {
189 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "
190 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",
191 ref_offset(xd->node), je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
192 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,
193 je32_to_cpu(rx.totlen), totlen,
194 je32_to_cpu(rx.xid), xd->xid,
195 je32_to_cpu(rx.version), xd->version);
196 return EIO;
197 }
198 xd->xprefix = rx.xprefix;
199 xd->name_len = rx.name_len;
200 xd->value_len = je16_to_cpu(rx.value_len);
201 xd->data_crc = je32_to_cpu(rx.data_crc);
202
203 /* This JFFS2_NODETYPE_XATTR node is checked */
204 jeb = &c->blocks[ref_offset(xd->node) / c->sector_size];
205 totlen = PAD(je32_to_cpu(rx.totlen));
206
207 spin_lock(&c->erase_completion_lock);
208 c->unchecked_size -= totlen; c->used_size += totlen;
209 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
210 xd->node->flash_offset = ref_offset(xd->node) | REF_PRISTINE;
211 spin_unlock(&c->erase_completion_lock);
212
213 /* unchecked xdatum is chained with c->xattr_unchecked */
214 list_del_init(&xd->xindex);
215
216 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",
217 xd->xid, xd->version);
218
219 return 0;
220}
221
222static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
223{
224 /* must be called under down_write(xattr_sem) */
225 char *data;
226 size_t readlen;
227 uint32_t crc, length;
228 int i, ret, retry = 0;
229
230 BUG_ON(!xd->node);
231 BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
232 BUG_ON(!list_empty(&xd->xindex));
233 retry:
234 length = xd->name_len + 1 + xd->value_len;
235 data = kmalloc(length, GFP_KERNEL);
236 if (!data)
237 return -ENOMEM;
238
239 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),
240 length, &readlen, data);
241
242 if (ret || length!=readlen) {
243 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%d, at %#08x\n",
244 ret, length, readlen, ref_offset(xd->node));
245 kfree(data);
246 return ret ? ret : -EIO;
247 }
248
249 data[xd->name_len] = '\0';
250 crc = crc32(0, data, length);
251 if (crc != xd->data_crc) {
252 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)"
253 " at %#08x, read: 0x%08x calculated: 0x%08x\n",
254 ref_offset(xd->node), xd->data_crc, crc);
255 kfree(data);
256 return EIO;
257 }
258
259 xd->flags |= JFFS2_XFLAGS_HOT;
260 xd->xname = data;
261 xd->xvalue = data + xd->name_len+1;
262
263 c->xdatum_mem_usage += length;
264
265 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);
266 i = xd->hashkey % XATTRINDEX_HASHSIZE;
267 list_add(&xd->xindex, &c->xattrindex[i]);
268 if (!retry) {
269 retry = 1;
270 reclaim_xattr_datum(c);
271 if (!xd->xname)
272 goto retry;
273 }
274
275 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",
276 xd->xid, xd->xprefix, xd->xname);
277
278 return 0;
279}
280
281static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
282{
283 /* must be called under down_write(xattr_sem);
284 * rc < 0 : recoverable error, try again
285 * rc = 0 : success
286 * rc > 0 : Unrecoverable error, this node should be deleted.
287 */
288 int rc = 0;
289 BUG_ON(xd->xname);
290 if (!xd->node)
291 return EIO;
292 if (unlikely(ref_flags(xd->node) != REF_PRISTINE)) {
293 rc = do_verify_xattr_datum(c, xd);
294 if (rc > 0) {
295 list_del_init(&xd->xindex);
296 delete_xattr_datum_node(c, xd);
297 }
298 }
299 if (!rc)
300 rc = do_load_xattr_datum(c, xd);
301 return rc;
302}
303
304static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, uint32_t phys_ofs)
305{
306 /* must be called under down_write(xattr_sem) */
307 struct jffs2_raw_xattr rx;
308 struct jffs2_raw_node_ref *raw;
309 struct kvec vecs[2];
310 uint32_t length;
311 int rc, totlen;
312
313 BUG_ON(!xd->xname);
314
315 vecs[0].iov_base = &rx;
316 vecs[0].iov_len = PAD(sizeof(rx));
317 vecs[1].iov_base = xd->xname;
318 vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
319 totlen = vecs[0].iov_len + vecs[1].iov_len;
320
321 raw = jffs2_alloc_raw_node_ref();
322 if (!raw)
323 return -ENOMEM;
324 raw->flash_offset = phys_ofs;
325 raw->__totlen = PAD(totlen);
326 raw->next_phys = NULL;
327 raw->next_in_ino = (void *)xd;
328
329 /* Setup raw-xattr */
330 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
331 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
332 rx.totlen = cpu_to_je32(PAD(totlen));
333 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
334
335 rx.xid = cpu_to_je32(xd->xid);
336 rx.version = cpu_to_je32(++xd->version);
337 rx.xprefix = xd->xprefix;
338 rx.name_len = xd->name_len;
339 rx.value_len = cpu_to_je16(xd->value_len);
340 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
341 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
342
343 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);
344 if (rc || totlen != length) {
345 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%u, at %#08x\n",
346 rc, totlen, length, phys_ofs);
347 rc = rc ? rc : -EIO;
348 if (length) {
349 raw->flash_offset |= REF_OBSOLETE;
350 raw->next_in_ino = NULL;
351 jffs2_add_physical_node_ref(c, raw);
352 jffs2_mark_node_obsolete(c, raw);
353 } else {
354 jffs2_free_raw_node_ref(raw);
355 }
356 return rc;
357 }
358 BUG_ON(raw->__totlen < sizeof(struct jffs2_raw_xattr));
359 /* success */
360 raw->flash_offset |= REF_PRISTINE;
361 jffs2_add_physical_node_ref(c, raw);
362 if (xd->node)
363 delete_xattr_datum_node(c, xd);
364 xd->node = raw;
365
366 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
367 xd->xid, xd->version, xd->xprefix, xd->xname);
368
369 return 0;
370}
371
372static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
373 int xprefix, const char *xname,
374 const char *xvalue, int xsize,
375 uint32_t phys_ofs)
376{
377 /* must be called under down_write(xattr_sem) */
378 struct jffs2_xattr_datum *xd;
379 uint32_t hashkey, name_len;
380 char *data;
381 int i, rc;
382
383 /* Search xattr_datum has same xname/xvalue by index */
384 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
385 i = hashkey % XATTRINDEX_HASHSIZE;
386 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
387 if (xd->hashkey==hashkey
388 && xd->xprefix==xprefix
389 && xd->value_len==xsize
390 && !strcmp(xd->xname, xname)
391 && !memcmp(xd->xvalue, xvalue, xsize)) {
392 xd->refcnt++;
393 return xd;
394 }
395 }
396
397 /* Not found, Create NEW XATTR-Cache */
398 name_len = strlen(xname);
399
400 xd = jffs2_alloc_xattr_datum();
401 if (!xd)
402 return ERR_PTR(-ENOMEM);
403
404 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
405 if (!data) {
406 jffs2_free_xattr_datum(xd);
407 return ERR_PTR(-ENOMEM);
408 }
409 strcpy(data, xname);
410 memcpy(data + name_len + 1, xvalue, xsize);
411
412 xd->refcnt = 1;
413 xd->xid = ++c->highest_xid;
414 xd->flags |= JFFS2_XFLAGS_HOT;
415 xd->xprefix = xprefix;
416
417 xd->hashkey = hashkey;
418 xd->xname = data;
419 xd->xvalue = data + name_len + 1;
420 xd->name_len = name_len;
421 xd->value_len = xsize;
422 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
423
424 rc = save_xattr_datum(c, xd, phys_ofs);
425 if (rc) {
426 kfree(xd->xname);
427 jffs2_free_xattr_datum(xd);
428 return ERR_PTR(rc);
429 }
430
431 /* Insert Hash Index */
432 i = hashkey % XATTRINDEX_HASHSIZE;
433 list_add(&xd->xindex, &c->xattrindex[i]);
434
435 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
436 reclaim_xattr_datum(c);
437
438 return xd;
439}
440
441/* -------- xdatum related functions ----------------
442 * verify_xattr_ref(c, ref)
443 * is used to load xref information from medium. Because summary data does not
444 * contain xid/ino, it's necessary to verify once while mounting process.
445 * delete_xattr_ref_node(c, ref)
446 * is used to delete a jffs2 node is dominated by xref. When EBS is enabled,
447 * it overwrites the obsolete node by myself.
448 * delete_xattr_ref(c, ref)
449 * is used to delete jffs2_xattr_ref object. If the reference counter of xdatum
450 * is refered by this xref become 0, delete_xattr_datum() is called later.
451 * save_xattr_ref(c, ref, phys_ofs)
452 * is used to write xref to medium.
453 * create_xattr_ref(c, ic, xd, phys_ofs)
454 * is used to create a new xref and write to medium.
455 * jffs2_xattr_delete_inode(c, ic)
456 * is called to remove xrefs related to obsolete inode when inode is unlinked.
457 * jffs2_xattr_free_inode(c, ic)
458 * is called to release xattr related objects when unmounting.
459 * check_xattr_ref_ilist(c, ic)
460 * is used to confirm inode does not have duplicate xattr name/value pair.
461 * -------------------------------------------------- */
462static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
463{
464 struct jffs2_eraseblock *jeb;
465 struct jffs2_raw_xref rr;
466 size_t readlen;
467 uint32_t crc, totlen;
468 int rc;
469
470 BUG_ON(ref_flags(ref->node) != REF_UNCHECKED);
471
472 rc = jffs2_flash_read(c, ref_offset(ref->node), sizeof(rr), &readlen, (char *)&rr);
473 if (rc || sizeof(rr) != readlen) {
474 JFFS2_WARNING("jffs2_flash_read()=%d, req=%u, read=%u, at %#08x\n",
475 rc, sizeof(rr), readlen, ref_offset(ref->node));
476 return rc ? rc : -EIO;
477 }
478 /* obsolete node */
479 crc = crc32(0, &rr, sizeof(rr) - 4);
480 if (crc != je32_to_cpu(rr.node_crc)) {
481 if (je32_to_cpu(rr.node_crc) != 0xffffffff)
482 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
483 ref_offset(ref->node), je32_to_cpu(rr.node_crc), crc);
484 return EIO;
485 }
486 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
487 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
488 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
489 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
490 "nodetype=%#04x/%#04x, totlen=%u/%u\n",
491 ref_offset(ref->node), je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
492 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
493 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
494 return EIO;
495 }
496 ref->ino = je32_to_cpu(rr.ino);
497 ref->xid = je32_to_cpu(rr.xid);
498
499 /* fixup superblock/eraseblock info */
500 jeb = &c->blocks[ref_offset(ref->node) / c->sector_size];
501 totlen = PAD(sizeof(rr));
502
503 spin_lock(&c->erase_completion_lock);
504 c->unchecked_size -= totlen; c->used_size += totlen;
505 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
506 ref->node->flash_offset = ref_offset(ref->node) | REF_PRISTINE;
507 spin_unlock(&c->erase_completion_lock);
508
509 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
510 ref->ino, ref->xid, ref_offset(ref->node));
511 return 0;
512}
513
514static void delete_xattr_ref_node(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
515{
516 struct jffs2_raw_xref rr;
517 uint32_t length;
518 int rc;
519
520 if (jffs2_sum_active()) {
521 memset(&rr, 0xff, sizeof(rr));
522 rc = jffs2_flash_read(c, ref_offset(ref->node),
523 sizeof(struct jffs2_unknown_node),
524 &length, (char *)&rr);
525 if (rc || length != sizeof(struct jffs2_unknown_node)) {
526 JFFS2_ERROR("jffs2_flash_read()=%d, req=%u, read=%u at %#08x\n",
527 rc, sizeof(struct jffs2_unknown_node),
528 length, ref_offset(ref->node));
529 }
530 rc = jffs2_flash_write(c, ref_offset(ref->node), sizeof(rr),
531 &length, (char *)&rr);
532 if (rc || length != sizeof(struct jffs2_raw_xref)) {
533 JFFS2_ERROR("jffs2_flash_write()=%d, req=%u, wrote=%u at %#08x\n",
534 rc, sizeof(rr), length, ref_offset(ref->node));
535 }
536 }
537 spin_lock(&c->erase_completion_lock);
538 ref->node->next_in_ino = NULL;
539 spin_unlock(&c->erase_completion_lock);
540 jffs2_mark_node_obsolete(c, ref->node);
541 ref->node = NULL;
542}
543
544static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
545{
546 /* must be called under down_write(xattr_sem) */
547 struct jffs2_xattr_datum *xd;
548
549 BUG_ON(!ref->node);
550 delete_xattr_ref_node(c, ref);
551
552 list_del(&ref->ilist);
553 xd = ref->xd;
554 xd->refcnt--;
555 if (!xd->refcnt)
556 delete_xattr_datum(c, xd);
557 jffs2_free_xattr_ref(ref);
558}
559
560static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, uint32_t phys_ofs)
561{
562 /* must be called under down_write(xattr_sem) */
563 struct jffs2_raw_node_ref *raw;
564 struct jffs2_raw_xref rr;
565 uint32_t length;
566 int ret;
567
568 raw = jffs2_alloc_raw_node_ref();
569 if (!raw)
570 return -ENOMEM;
571 raw->flash_offset = phys_ofs;
572 raw->__totlen = PAD(sizeof(rr));
573 raw->next_phys = NULL;
574 raw->next_in_ino = (void *)ref;
575
576 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
577 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
578 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
579 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
580
581 rr.ino = cpu_to_je32(ref->ic->ino);
582 rr.xid = cpu_to_je32(ref->xd->xid);
583 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
584
585 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
586 if (ret || sizeof(rr) != length) {
587 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%u, retlen=%u, at %#08x\n",
588 ret, sizeof(rr), length, phys_ofs);
589 ret = ret ? ret : -EIO;
590 if (length) {
591 raw->flash_offset |= REF_OBSOLETE;
592 raw->next_in_ino = NULL;
593 jffs2_add_physical_node_ref(c, raw);
594 jffs2_mark_node_obsolete(c, raw);
595 } else {
596 jffs2_free_raw_node_ref(raw);
597 }
598 return ret;
599 }
600 raw->flash_offset |= REF_PRISTINE;
601
602 jffs2_add_physical_node_ref(c, raw);
603 if (ref->node)
604 delete_xattr_ref_node(c, ref);
605 ref->node = raw;
606
607 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
608
609 return 0;
610}
611
612static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
613 struct jffs2_xattr_datum *xd, uint32_t phys_ofs)
614{
615 /* must be called under down_write(xattr_sem) */
616 struct jffs2_xattr_ref *ref;
617 int ret;
618
619 ref = jffs2_alloc_xattr_ref();
620 if (!ref)
621 return ERR_PTR(-ENOMEM);
622 ref->ic = ic;
623 ref->xd = xd;
624
625 ret = save_xattr_ref(c, ref, phys_ofs);
626 if (ret) {
627 jffs2_free_xattr_ref(ref);
628 return ERR_PTR(ret);
629 }
630
631 /* Chain to inode */
632 list_add(&ref->ilist, &ic->ilist);
633
634 return ref; /* success */
635}
636
637void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
638{
639 /* It's called from jffs2_clear_inode() on inode removing.
640 When an inode with XATTR is removed, those XATTRs must be removed. */
641 struct jffs2_xattr_ref *ref, *_ref;
642
643 if (!ic || ic->nlink > 0)
644 return;
645
646 down_write(&c->xattr_sem);
647 list_for_each_entry_safe(ref, _ref, &ic->ilist, ilist)
648 delete_xattr_ref(c, ref);
649 up_write(&c->xattr_sem);
650}
651
652void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
653{
654 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
655 struct jffs2_xattr_datum *xd;
656 struct jffs2_xattr_ref *ref, *_ref;
657
658 down_write(&c->xattr_sem);
659 list_for_each_entry_safe(ref, _ref, &ic->ilist, ilist) {
660 list_del(&ref->ilist);
661 xd = ref->xd;
662 xd->refcnt--;
663 if (!xd->refcnt) {
664 unload_xattr_datum(c, xd);
665 jffs2_free_xattr_datum(xd);
666 }
667 jffs2_free_xattr_ref(ref);
668 }
669 up_write(&c->xattr_sem);
670}
671
672static int check_xattr_ref_ilist(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
673{
674 /* success of check_xattr_ref_ilist() means taht inode (ic) dose not have
675 * duplicate name/value pairs. If duplicate name/value pair would be found,
676 * one will be removed.
677 */
678 struct jffs2_xattr_ref *ref, *cmp;
679 int rc = 0;
680
681 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
682 return 0;
683 down_write(&c->xattr_sem);
684 retry:
685 rc = 0;
686 list_for_each_entry(ref, &ic->ilist, ilist) {
687 if (!ref->xd->xname) {
688 rc = load_xattr_datum(c, ref->xd);
689 if (unlikely(rc > 0)) {
690 delete_xattr_ref(c, ref);
691 goto retry;
692 } else if (unlikely(rc < 0))
693 goto out;
694 }
695 cmp = ref;
696 list_for_each_entry_continue(cmp, &ic->ilist, ilist) {
697 if (!cmp->xd->xname) {
698 ref->xd->flags |= JFFS2_XFLAGS_BIND;
699 rc = load_xattr_datum(c, cmp->xd);
700 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
701 if (unlikely(rc > 0)) {
702 delete_xattr_ref(c, cmp);
703 goto retry;
704 } else if (unlikely(rc < 0))
705 goto out;
706 }
707 if (ref->xd->xprefix == cmp->xd->xprefix
708 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
709 delete_xattr_ref(c, cmp);
710 goto retry;
711 }
712 }
713 }
714 ic->flags |= INO_FLAGS_XATTR_CHECKED;
715 out:
716 up_write(&c->xattr_sem);
717
718 return rc;
719}
720
721/* -------- xattr subsystem functions ---------------
722 * jffs2_init_xattr_subsystem(c)
723 * is used to initialize semaphore and list_head, and some variables.
724 * jffs2_find_xattr_datum(c, xid)
725 * is used to lookup xdatum while scanning process.
726 * jffs2_clear_xattr_subsystem(c)
727 * is used to release any xattr related objects.
728 * jffs2_build_xattr_subsystem(c)
729 * is used to associate xdatum and xref while super block building process.
730 * jffs2_setup_xattr_datum(c, xid, version)
731 * is used to insert xdatum while scanning process.
732 * -------------------------------------------------- */
733void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
734{
735 int i;
736
737 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
738 INIT_LIST_HEAD(&c->xattrindex[i]);
739 INIT_LIST_HEAD(&c->xattr_temp);
740 INIT_LIST_HEAD(&c->xattr_unchecked);
741
742 init_rwsem(&c->xattr_sem);
743 c->xdatum_mem_usage = 0;
744 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
745}
746
747static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
748{
749 struct jffs2_xattr_datum *xd;
750 int i = xid % XATTRINDEX_HASHSIZE;
751
752 /* It's only used in scanning/building process. */
753 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
754
755 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
756 if (xd->xid==xid)
757 return xd;
758 }
759 return NULL;
760}
761
762void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
763{
764 struct jffs2_xattr_datum *xd, *_xd;
765 struct jffs2_xattr_ref *ref, *_ref;
766 int i;
767
768 list_for_each_entry_safe(ref, _ref, &c->xattr_temp, ilist)
769 jffs2_free_xattr_ref(ref);
770
771 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
772 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
773 list_del(&xd->xindex);
774 if (xd->xname)
775 kfree(xd->xname);
776 jffs2_free_xattr_datum(xd);
777 }
778 }
779}
780
781void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
782{
783 struct jffs2_xattr_ref *ref, *_ref;
784 struct jffs2_xattr_datum *xd, *_xd;
785 struct jffs2_inode_cache *ic;
786 int i, xdatum_count =0, xdatum_unchecked_count = 0, xref_count = 0;
787
788 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
789
790 /* Phase.1 */
791 list_for_each_entry_safe(ref, _ref, &c->xattr_temp, ilist) {
792 list_del_init(&ref->ilist);
793 /* checking REF_UNCHECKED nodes */
794 if (ref_flags(ref->node) != REF_PRISTINE) {
795 if (verify_xattr_ref(c, ref)) {
796 delete_xattr_ref_node(c, ref);
797 jffs2_free_xattr_ref(ref);
798 continue;
799 }
800 }
801 /* At this point, ref->xid and ref->ino contain XID and inode number.
802 ref->xd and ref->ic are not valid yet. */
803 xd = jffs2_find_xattr_datum(c, ref->xid);
804 ic = jffs2_get_ino_cache(c, ref->ino);
805 if (!xd || !ic) {
806 if (ref_flags(ref->node) != REF_UNCHECKED)
807 JFFS2_WARNING("xref(ino=%u, xid=%u) is orphan. \n",
808 ref->ino, ref->xid);
809 delete_xattr_ref_node(c, ref);
810 jffs2_free_xattr_ref(ref);
811 continue;
812 }
813 ref->xd = xd;
814 ref->ic = ic;
815 xd->refcnt++;
816 list_add_tail(&ref->ilist, &ic->ilist);
817 xref_count++;
818 }
819 /* After this, ref->xid/ino are NEVER used. */
820
821 /* Phase.2 */
822 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
823 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
824 list_del_init(&xd->xindex);
825 if (!xd->refcnt) {
826 if (ref_flags(xd->node) != REF_UNCHECKED)
827 JFFS2_WARNING("orphan xdatum(xid=%u, version=%u) at %#08x\n",
828 xd->xid, xd->version, ref_offset(xd->node));
829 delete_xattr_datum(c, xd);
830 continue;
831 }
832 if (ref_flags(xd->node) != REF_PRISTINE) {
833 dbg_xattr("unchecked xdatum(xid=%u) at %#08x\n",
834 xd->xid, ref_offset(xd->node));
835 list_add(&xd->xindex, &c->xattr_unchecked);
836 xdatum_unchecked_count++;
837 }
838 xdatum_count++;
839 }
840 }
841 /* build complete */
842 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum (%u unchecked) and "
843 "%u of xref found.\n", xdatum_count, xdatum_unchecked_count, xref_count);
844}
845
846struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
847 uint32_t xid, uint32_t version)
848{
849 struct jffs2_xattr_datum *xd, *_xd;
850
851 _xd = jffs2_find_xattr_datum(c, xid);
852 if (_xd) {
853 dbg_xattr("duplicate xdatum (xid=%u, version=%u/%u) at %#08x\n",
854 xid, version, _xd->version, ref_offset(_xd->node));
855 if (version < _xd->version)
856 return ERR_PTR(-EEXIST);
857 }
858 xd = jffs2_alloc_xattr_datum();
859 if (!xd)
860 return ERR_PTR(-ENOMEM);
861 xd->xid = xid;
862 xd->version = version;
863 if (xd->xid > c->highest_xid)
864 c->highest_xid = xd->xid;
865 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
866
867 if (_xd) {
868 list_del_init(&_xd->xindex);
869 delete_xattr_datum_node(c, _xd);
870 jffs2_free_xattr_datum(_xd);
871 }
872 return xd;
873}
874
875/* -------- xattr subsystem functions ---------------
876 * xprefix_to_handler(xprefix)
877 * is used to translate xprefix into xattr_handler.
878 * jffs2_listxattr(dentry, buffer, size)
879 * is an implementation of listxattr handler on jffs2.
880 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
881 * is an implementation of getxattr handler on jffs2.
882 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
883 * is an implementation of setxattr handler on jffs2.
884 * -------------------------------------------------- */
885struct xattr_handler *jffs2_xattr_handlers[] = {
886 &jffs2_user_xattr_handler,
887#ifdef CONFIG_JFFS2_FS_SECURITY
888 &jffs2_security_xattr_handler,
889#endif
890#ifdef CONFIG_JFFS2_FS_POSIX_ACL
891 &jffs2_acl_access_xattr_handler,
892 &jffs2_acl_default_xattr_handler,
893#endif
894 &jffs2_trusted_xattr_handler,
895 NULL
896};
897
898static struct xattr_handler *xprefix_to_handler(int xprefix) {
899 struct xattr_handler *ret;
900
901 switch (xprefix) {
902 case JFFS2_XPREFIX_USER:
903 ret = &jffs2_user_xattr_handler;
904 break;
905#ifdef CONFIG_JFFS2_FS_SECURITY
906 case JFFS2_XPREFIX_SECURITY:
907 ret = &jffs2_security_xattr_handler;
908 break;
909#endif
910#ifdef CONFIG_JFFS2_FS_POSIX_ACL
911 case JFFS2_XPREFIX_ACL_ACCESS:
912 ret = &jffs2_acl_access_xattr_handler;
913 break;
914 case JFFS2_XPREFIX_ACL_DEFAULT:
915 ret = &jffs2_acl_default_xattr_handler;
916 break;
917#endif
918 case JFFS2_XPREFIX_TRUSTED:
919 ret = &jffs2_trusted_xattr_handler;
920 break;
921 default:
922 ret = NULL;
923 break;
924 }
925 return ret;
926}
927
928ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
929{
930 struct inode *inode = dentry->d_inode;
931 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
932 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
933 struct jffs2_inode_cache *ic = f->inocache;
934 struct jffs2_xattr_ref *ref;
935 struct jffs2_xattr_datum *xd;
936 struct xattr_handler *xhandle;
937 ssize_t len, rc;
938 int retry = 0;
939
940 rc = check_xattr_ref_ilist(c, ic);
941 if (unlikely(rc))
942 return rc;
943
944 down_read(&c->xattr_sem);
945 retry:
946 len = 0;
947 list_for_each_entry(ref, &ic->ilist, ilist) {
948 BUG_ON(ref->ic != ic);
949 xd = ref->xd;
950 if (!xd->xname) {
951 /* xdatum is unchached */
952 if (!retry) {
953 retry = 1;
954 up_read(&c->xattr_sem);
955 down_write(&c->xattr_sem);
956 goto retry;
957 } else {
958 rc = load_xattr_datum(c, xd);
959 if (unlikely(rc > 0)) {
960 delete_xattr_ref(c, ref);
961 goto retry;
962 } else if (unlikely(rc < 0))
963 goto out;
964 }
965 }
966 xhandle = xprefix_to_handler(xd->xprefix);
967 if (!xhandle)
968 continue;
969 if (buffer) {
970 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
971 } else {
972 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
973 }
974 if (rc < 0)
975 goto out;
976 len += rc;
977 }
978 rc = len;
979 out:
980 if (!retry) {
981 up_read(&c->xattr_sem);
982 } else {
983 up_write(&c->xattr_sem);
984 }
985 return rc;
986}
987
988int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
989 char *buffer, size_t size)
990{
991 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
992 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
993 struct jffs2_inode_cache *ic = f->inocache;
994 struct jffs2_xattr_datum *xd;
995 struct jffs2_xattr_ref *ref;
996 int rc, retry = 0;
997
998 rc = check_xattr_ref_ilist(c, ic);
999 if (unlikely(rc))
1000 return rc;
1001
1002 down_read(&c->xattr_sem);
1003 retry:
1004 list_for_each_entry(ref, &ic->ilist, ilist) {
1005 BUG_ON(ref->ic!=ic);
1006
1007 xd = ref->xd;
1008 if (xd->xprefix != xprefix)
1009 continue;
1010 if (!xd->xname) {
1011 /* xdatum is unchached */
1012 if (!retry) {
1013 retry = 1;
1014 up_read(&c->xattr_sem);
1015 down_write(&c->xattr_sem);
1016 goto retry;
1017 } else {
1018 rc = load_xattr_datum(c, xd);
1019 if (unlikely(rc > 0)) {
1020 delete_xattr_ref(c, ref);
1021 goto retry;
1022 } else if (unlikely(rc < 0)) {
1023 goto out;
1024 }
1025 }
1026 }
1027 if (!strcmp(xname, xd->xname)) {
1028 rc = xd->value_len;
1029 if (buffer) {
1030 if (size < rc) {
1031 rc = -ERANGE;
1032 } else {
1033 memcpy(buffer, xd->xvalue, rc);
1034 }
1035 }
1036 goto out;
1037 }
1038 }
1039 rc = -ENODATA;
1040 out:
1041 if (!retry) {
1042 up_read(&c->xattr_sem);
1043 } else {
1044 up_write(&c->xattr_sem);
1045 }
1046 return rc;
1047}
1048
1049int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1050 const char *buffer, size_t size, int flags)
1051{
1052 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1053 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1054 struct jffs2_inode_cache *ic = f->inocache;
1055 struct jffs2_xattr_datum *xd;
1056 struct jffs2_xattr_ref *ref, *newref;
1057 uint32_t phys_ofs, length, request;
1058 int rc;
1059
1060 rc = check_xattr_ref_ilist(c, ic);
1061 if (unlikely(rc))
1062 return rc;
1063
1064 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1065 rc = jffs2_reserve_space(c, request, &phys_ofs, &length,
1066 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1067 if (rc) {
1068 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1069 return rc;
1070 }
1071
1072 /* Find existing xattr */
1073 down_write(&c->xattr_sem);
1074 retry:
1075 list_for_each_entry(ref, &ic->ilist, ilist) {
1076 xd = ref->xd;
1077 if (xd->xprefix != xprefix)
1078 continue;
1079 if (!xd->xname) {
1080 rc = load_xattr_datum(c, xd);
1081 if (unlikely(rc > 0)) {
1082 delete_xattr_ref(c, ref);
1083 goto retry;
1084 } else if (unlikely(rc < 0))
1085 goto out;
1086 }
1087 if (!strcmp(xd->xname, xname)) {
1088 if (flags & XATTR_CREATE) {
1089 rc = -EEXIST;
1090 goto out;
1091 }
1092 if (!buffer) {
1093 delete_xattr_ref(c, ref);
1094 rc = 0;
1095 goto out;
1096 }
1097 goto found;
1098 }
1099 }
1100 /* not found */
1101 ref = NULL;
1102 if (flags & XATTR_REPLACE) {
1103 rc = -ENODATA;
1104 goto out;
1105 }
1106 if (!buffer) {
1107 rc = -EINVAL;
1108 goto out;
1109 }
1110 found:
1111 xd = create_xattr_datum(c, xprefix, xname, buffer, size, phys_ofs);
1112 if (IS_ERR(xd)) {
1113 rc = PTR_ERR(xd);
1114 goto out;
1115 }
1116 up_write(&c->xattr_sem);
1117 jffs2_complete_reservation(c);
1118
1119 /* create xattr_ref */
1120 request = PAD(sizeof(struct jffs2_raw_xref));
1121 rc = jffs2_reserve_space(c, request, &phys_ofs, &length,
1122 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
1123 if (rc) {
1124 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1125 down_write(&c->xattr_sem);
1126 xd->refcnt--;
1127 if (!xd->refcnt)
1128 delete_xattr_datum(c, xd);
1129 up_write(&c->xattr_sem);
1130 return rc;
1131 }
1132 down_write(&c->xattr_sem);
1133 newref = create_xattr_ref(c, ic, xd, phys_ofs);
1134 if (IS_ERR(newref)) {
1135 rc = PTR_ERR(newref);
1136 xd->refcnt--;
1137 if (!xd->refcnt)
1138 delete_xattr_datum(c, xd);
1139 } else if (ref) {
1140 /* If replaced xattr_ref exists */
1141 delete_xattr_ref(c, ref);
1142 }
1143 out:
1144 up_write(&c->xattr_sem);
1145 jffs2_complete_reservation(c);
1146 return rc;
1147}
1148
1149/* -------- garbage collector functions -------------
1150 * jffs2_garbage_collect_xattr_datum(c, xd)
1151 * is used to move xdatum into new node.
1152 * jffs2_garbage_collect_xattr_ref(c, ref)
1153 * is used to move xref into new node.
1154 * jffs2_garbage_collect_xattr(c, ic)
1155 * is used to call appropriate garbage collector function, if argument
1156 * pointer (ic) is the reference of xdatum/xref.
1157 * jffs2_verify_xattr(c)
1158 * is used to call do_verify_xattr_datum() before garbage collecting.
1159 * -------------------------------------------------- */
1160static int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c,
1161 struct jffs2_xattr_datum *xd)
1162{
1163 /* must be called under down_write(xattr_sem), and called from GC thread */
1164 uint32_t phys_ofs, totlen, length, old_ofs;
1165 int rc;
1166
1167 BUG_ON(!xd->node);
1168
1169 old_ofs = ref_offset(xd->node);
1170 totlen = ref_totlen(c, c->gcblock, xd->node);
1171 if (totlen < sizeof(struct jffs2_raw_xattr))
1172 return -EINVAL;
1173
1174 if (!xd->xname) {
1175 rc = load_xattr_datum(c, xd);
1176 if (unlikely(rc > 0)) {
1177 delete_xattr_datum_node(c, xd);
1178 return 0;
1179 } else if (unlikely(rc < 0))
1180 return -EINVAL;
1181 }
1182 rc = jffs2_reserve_space_gc(c, totlen, &phys_ofs, &length, JFFS2_SUMMARY_XATTR_SIZE);
1183 if (rc || length < totlen) {
1184 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, totlen);
1185 return rc ? rc : -EBADFD;
1186 }
1187 rc = save_xattr_datum(c, xd, phys_ofs);
1188 if (!rc)
1189 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1190 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1191 return rc;
1192}
1193
1194
1195static int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c,
1196 struct jffs2_xattr_ref *ref)
1197{
1198 /* must be called under down(alloc_sem) */
1199 uint32_t phys_ofs, totlen, length, old_ofs;
1200 int rc;
1201
1202 BUG_ON(!ref->node);
1203
1204 old_ofs = ref_offset(ref->node);
1205 totlen = ref_totlen(c, c->gcblock, ref->node);
1206 if (totlen != sizeof(struct jffs2_raw_xref))
1207 return -EINVAL;
1208 rc = jffs2_reserve_space_gc(c, totlen, &phys_ofs, &length, JFFS2_SUMMARY_XREF_SIZE);
1209 if (rc || length < totlen) {
1210 JFFS2_WARNING("%s: jffs2_reserve_space() = %d, request = %u\n",
1211 __FUNCTION__, rc, totlen);
1212 return rc ? rc : -EBADFD;
1213 }
1214 rc = save_xattr_ref(c, ref, phys_ofs);
1215 if (!rc)
1216 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1217 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1218 return rc;
1219}
1220
1221int jffs2_garbage_collect_xattr(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
1222{
1223 struct jffs2_xattr_datum *xd;
1224 struct jffs2_xattr_ref *ref;
1225 int ret;
1226
1227 switch (ic->class) {
1228 case RAWNODE_CLASS_XATTR_DATUM:
1229 spin_unlock(&c->erase_completion_lock);
1230
1231 down_write(&c->xattr_sem);
1232 xd = (struct jffs2_xattr_datum *)ic;
1233 ret = xd ? jffs2_garbage_collect_xattr_datum(c, xd) : 0;
1234 up_write(&c->xattr_sem);
1235 break;
1236 case RAWNODE_CLASS_XATTR_REF:
1237 spin_unlock(&c->erase_completion_lock);
1238
1239 down_write(&c->xattr_sem);
1240 ref = (struct jffs2_xattr_ref *)ic;
1241 ret = ref ? jffs2_garbage_collect_xattr_ref(c, ref) : 0;
1242 up_write(&c->xattr_sem);
1243 break;
1244 default:
1245 /* This node is not xattr_datum/xattr_ref */
1246 ret = 1;
1247 break;
1248 }
1249 return ret;
1250}
1251
1252int jffs2_verify_xattr(struct jffs2_sb_info *c)
1253{
1254 struct jffs2_xattr_datum *xd, *_xd;
1255 int rc;
1256
1257 down_write(&c->xattr_sem);
1258 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1259 rc = do_verify_xattr_datum(c, xd);
1260 if (rc == 0) {
1261 list_del_init(&xd->xindex);
1262 break;
1263 } else if (rc > 0) {
1264 list_del_init(&xd->xindex);
1265 delete_xattr_datum_node(c, xd);
1266 }
1267 }
1268 up_write(&c->xattr_sem);
1269
1270 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1271}
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 03:34:11 -0400