aboutsummaryrefslogtreecommitdiffstats
path: root/fs/jffs2/xattr.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/jffs2/xattr.c')
-rw-r--r--fs/jffs2/xattr.c1238
1 files changed, 1238 insertions, 0 deletions
diff --git a/fs/jffs2/xattr.c b/fs/jffs2/xattr.c
new file mode 100644
index 000000000000..2d82e250be34
--- /dev/null
+++ b/fs/jffs2/xattr.c
@@ -0,0 +1,1238 @@
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 * 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)
53 * is used to write xdatum to medium. xd->version will be incremented.
54 * create_xattr_datum(c, xprefix, xname, xvalue, xsize)
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 size_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=%zu, read=%zu 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=%zu, wrote=%zu 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=%zu, read=%zu 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=%zu, 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)
305{
306 /* must be called under down_write(xattr_sem) */
307 struct jffs2_raw_node_ref *raw;
308 struct jffs2_raw_xattr rx;
309 struct kvec vecs[2];
310 size_t length;
311 int rc, totlen;
312 uint32_t phys_ofs = write_ofs(c);
313
314 BUG_ON(!xd->xname);
315
316 vecs[0].iov_base = &rx;
317 vecs[0].iov_len = PAD(sizeof(rx));
318 vecs[1].iov_base = xd->xname;
319 vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
320 totlen = vecs[0].iov_len + vecs[1].iov_len;
321
322 /* Setup raw-xattr */
323 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
324 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
325 rx.totlen = cpu_to_je32(PAD(totlen));
326 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
327
328 rx.xid = cpu_to_je32(xd->xid);
329 rx.version = cpu_to_je32(++xd->version);
330 rx.xprefix = xd->xprefix;
331 rx.name_len = xd->name_len;
332 rx.value_len = cpu_to_je16(xd->value_len);
333 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
334 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
335
336 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);
337 if (rc || totlen != length) {
338 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",
339 rc, totlen, length, phys_ofs);
340 rc = rc ? rc : -EIO;
341 if (length)
342 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);
343
344 return rc;
345 }
346
347 /* success */
348 raw = jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), NULL);
349 /* FIXME */ raw->next_in_ino = (void *)xd;
350
351 if (xd->node)
352 delete_xattr_datum_node(c, xd);
353 xd->node = raw;
354
355 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
356 xd->xid, xd->version, xd->xprefix, xd->xname);
357
358 return 0;
359}
360
361static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
362 int xprefix, const char *xname,
363 const char *xvalue, int xsize)
364{
365 /* must be called under down_write(xattr_sem) */
366 struct jffs2_xattr_datum *xd;
367 uint32_t hashkey, name_len;
368 char *data;
369 int i, rc;
370
371 /* Search xattr_datum has same xname/xvalue by index */
372 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
373 i = hashkey % XATTRINDEX_HASHSIZE;
374 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
375 if (xd->hashkey==hashkey
376 && xd->xprefix==xprefix
377 && xd->value_len==xsize
378 && !strcmp(xd->xname, xname)
379 && !memcmp(xd->xvalue, xvalue, xsize)) {
380 xd->refcnt++;
381 return xd;
382 }
383 }
384
385 /* Not found, Create NEW XATTR-Cache */
386 name_len = strlen(xname);
387
388 xd = jffs2_alloc_xattr_datum();
389 if (!xd)
390 return ERR_PTR(-ENOMEM);
391
392 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
393 if (!data) {
394 jffs2_free_xattr_datum(xd);
395 return ERR_PTR(-ENOMEM);
396 }
397 strcpy(data, xname);
398 memcpy(data + name_len + 1, xvalue, xsize);
399
400 xd->refcnt = 1;
401 xd->xid = ++c->highest_xid;
402 xd->flags |= JFFS2_XFLAGS_HOT;
403 xd->xprefix = xprefix;
404
405 xd->hashkey = hashkey;
406 xd->xname = data;
407 xd->xvalue = data + name_len + 1;
408 xd->name_len = name_len;
409 xd->value_len = xsize;
410 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
411
412 rc = save_xattr_datum(c, xd);
413 if (rc) {
414 kfree(xd->xname);
415 jffs2_free_xattr_datum(xd);
416 return ERR_PTR(rc);
417 }
418
419 /* Insert Hash Index */
420 i = hashkey % XATTRINDEX_HASHSIZE;
421 list_add(&xd->xindex, &c->xattrindex[i]);
422
423 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
424 reclaim_xattr_datum(c);
425
426 return xd;
427}
428
429/* -------- xref related functions ------------------
430 * verify_xattr_ref(c, ref)
431 * is used to load xref information from medium. Because summary data does not
432 * contain xid/ino, it's necessary to verify once while mounting process.
433 * delete_xattr_ref_node(c, ref)
434 * is used to delete a jffs2 node is dominated by xref. When EBS is enabled,
435 * it overwrites the obsolete node by myself.
436 * delete_xattr_ref(c, ref)
437 * is used to delete jffs2_xattr_ref object. If the reference counter of xdatum
438 * is refered by this xref become 0, delete_xattr_datum() is called later.
439 * save_xattr_ref(c, ref)
440 * is used to write xref to medium.
441 * create_xattr_ref(c, ic, xd)
442 * is used to create a new xref and write to medium.
443 * jffs2_xattr_delete_inode(c, ic)
444 * is called to remove xrefs related to obsolete inode when inode is unlinked.
445 * jffs2_xattr_free_inode(c, ic)
446 * is called to release xattr related objects when unmounting.
447 * check_xattr_ref_inode(c, ic)
448 * is used to confirm inode does not have duplicate xattr name/value pair.
449 * -------------------------------------------------- */
450static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
451{
452 struct jffs2_eraseblock *jeb;
453 struct jffs2_raw_xref rr;
454 size_t readlen;
455 uint32_t crc, totlen;
456 int rc;
457
458 BUG_ON(ref_flags(ref->node) != REF_UNCHECKED);
459
460 rc = jffs2_flash_read(c, ref_offset(ref->node), sizeof(rr), &readlen, (char *)&rr);
461 if (rc || sizeof(rr) != readlen) {
462 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
463 rc, sizeof(rr), readlen, ref_offset(ref->node));
464 return rc ? rc : -EIO;
465 }
466 /* obsolete node */
467 crc = crc32(0, &rr, sizeof(rr) - 4);
468 if (crc != je32_to_cpu(rr.node_crc)) {
469 if (je32_to_cpu(rr.node_crc) != 0xffffffff)
470 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
471 ref_offset(ref->node), je32_to_cpu(rr.node_crc), crc);
472 return EIO;
473 }
474 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
475 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
476 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
477 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
478 "nodetype=%#04x/%#04x, totlen=%u/%zu\n",
479 ref_offset(ref->node), je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
480 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
481 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
482 return EIO;
483 }
484 ref->ino = je32_to_cpu(rr.ino);
485 ref->xid = je32_to_cpu(rr.xid);
486
487 /* fixup superblock/eraseblock info */
488 jeb = &c->blocks[ref_offset(ref->node) / c->sector_size];
489 totlen = PAD(sizeof(rr));
490
491 spin_lock(&c->erase_completion_lock);
492 c->unchecked_size -= totlen; c->used_size += totlen;
493 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
494 ref->node->flash_offset = ref_offset(ref->node) | REF_PRISTINE;
495 spin_unlock(&c->erase_completion_lock);
496
497 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
498 ref->ino, ref->xid, ref_offset(ref->node));
499 return 0;
500}
501
502static void delete_xattr_ref_node(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
503{
504 struct jffs2_raw_xref rr;
505 size_t length;
506 int rc;
507
508 if (jffs2_sum_active()) {
509 memset(&rr, 0xff, sizeof(rr));
510 rc = jffs2_flash_read(c, ref_offset(ref->node),
511 sizeof(struct jffs2_unknown_node),
512 &length, (char *)&rr);
513 if (rc || length != sizeof(struct jffs2_unknown_node)) {
514 JFFS2_ERROR("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
515 rc, sizeof(struct jffs2_unknown_node),
516 length, ref_offset(ref->node));
517 }
518 rc = jffs2_flash_write(c, ref_offset(ref->node), sizeof(rr),
519 &length, (char *)&rr);
520 if (rc || length != sizeof(struct jffs2_raw_xref)) {
521 JFFS2_ERROR("jffs2_flash_write()=%d, req=%zu, wrote=%zu at %#08x\n",
522 rc, sizeof(rr), length, ref_offset(ref->node));
523 }
524 }
525 spin_lock(&c->erase_completion_lock);
526 ref->node->next_in_ino = NULL;
527 spin_unlock(&c->erase_completion_lock);
528 jffs2_mark_node_obsolete(c, ref->node);
529 ref->node = NULL;
530}
531
532static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
533{
534 /* must be called under down_write(xattr_sem) */
535 struct jffs2_xattr_datum *xd;
536
537 BUG_ON(!ref->node);
538 delete_xattr_ref_node(c, ref);
539
540 xd = ref->xd;
541 xd->refcnt--;
542 if (!xd->refcnt)
543 delete_xattr_datum(c, xd);
544 jffs2_free_xattr_ref(ref);
545}
546
547static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
548{
549 /* must be called under down_write(xattr_sem) */
550 struct jffs2_raw_node_ref *raw;
551 struct jffs2_raw_xref rr;
552 size_t length;
553 uint32_t phys_ofs = write_ofs(c);
554 int ret;
555
556 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
557 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
558 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
559 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
560
561 rr.ino = cpu_to_je32(ref->ic->ino);
562 rr.xid = cpu_to_je32(ref->xd->xid);
563 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
564
565 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
566 if (ret || sizeof(rr) != length) {
567 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
568 ret, sizeof(rr), length, phys_ofs);
569 ret = ret ? ret : -EIO;
570 if (length)
571 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
572
573 return ret;
574 }
575
576 raw = jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), NULL);
577 /* FIXME */ raw->next_in_ino = (void *)ref;
578 if (ref->node)
579 delete_xattr_ref_node(c, ref);
580 ref->node = raw;
581
582 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
583
584 return 0;
585}
586
587static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
588 struct jffs2_xattr_datum *xd)
589{
590 /* must be called under down_write(xattr_sem) */
591 struct jffs2_xattr_ref *ref;
592 int ret;
593
594 ref = jffs2_alloc_xattr_ref();
595 if (!ref)
596 return ERR_PTR(-ENOMEM);
597 ref->ic = ic;
598 ref->xd = xd;
599
600 ret = save_xattr_ref(c, ref);
601 if (ret) {
602 jffs2_free_xattr_ref(ref);
603 return ERR_PTR(ret);
604 }
605
606 /* Chain to inode */
607 ref->next = ic->xref;
608 ic->xref = ref;
609
610 return ref; /* success */
611}
612
613void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
614{
615 /* It's called from jffs2_clear_inode() on inode removing.
616 When an inode with XATTR is removed, those XATTRs must be removed. */
617 struct jffs2_xattr_ref *ref, *_ref;
618
619 if (!ic || ic->nlink > 0)
620 return;
621
622 down_write(&c->xattr_sem);
623 for (ref = ic->xref; ref; ref = _ref) {
624 _ref = ref->next;
625 delete_xattr_ref(c, ref);
626 }
627 ic->xref = NULL;
628 up_write(&c->xattr_sem);
629}
630
631void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
632{
633 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
634 struct jffs2_xattr_datum *xd;
635 struct jffs2_xattr_ref *ref, *_ref;
636
637 down_write(&c->xattr_sem);
638 for (ref = ic->xref; ref; ref = _ref) {
639 _ref = ref->next;
640 xd = ref->xd;
641 xd->refcnt--;
642 if (!xd->refcnt) {
643 unload_xattr_datum(c, xd);
644 jffs2_free_xattr_datum(xd);
645 }
646 jffs2_free_xattr_ref(ref);
647 }
648 ic->xref = NULL;
649 up_write(&c->xattr_sem);
650}
651
652static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
653{
654 /* success of check_xattr_ref_inode() means taht inode (ic) dose not have
655 * duplicate name/value pairs. If duplicate name/value pair would be found,
656 * one will be removed.
657 */
658 struct jffs2_xattr_ref *ref, *cmp, **pref;
659 int rc = 0;
660
661 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
662 return 0;
663 down_write(&c->xattr_sem);
664 retry:
665 rc = 0;
666 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
667 if (!ref->xd->xname) {
668 rc = load_xattr_datum(c, ref->xd);
669 if (unlikely(rc > 0)) {
670 *pref = ref->next;
671 delete_xattr_ref(c, ref);
672 goto retry;
673 } else if (unlikely(rc < 0))
674 goto out;
675 }
676 for (cmp=ref->next, pref=&ref->next; cmp; pref=&cmp->next, cmp=cmp->next) {
677 if (!cmp->xd->xname) {
678 ref->xd->flags |= JFFS2_XFLAGS_BIND;
679 rc = load_xattr_datum(c, cmp->xd);
680 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
681 if (unlikely(rc > 0)) {
682 *pref = cmp->next;
683 delete_xattr_ref(c, cmp);
684 goto retry;
685 } else if (unlikely(rc < 0))
686 goto out;
687 }
688 if (ref->xd->xprefix == cmp->xd->xprefix
689 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
690 *pref = cmp->next;
691 delete_xattr_ref(c, cmp);
692 goto retry;
693 }
694 }
695 }
696 ic->flags |= INO_FLAGS_XATTR_CHECKED;
697 out:
698 up_write(&c->xattr_sem);
699
700 return rc;
701}
702
703/* -------- xattr subsystem functions ---------------
704 * jffs2_init_xattr_subsystem(c)
705 * is used to initialize semaphore and list_head, and some variables.
706 * jffs2_find_xattr_datum(c, xid)
707 * is used to lookup xdatum while scanning process.
708 * jffs2_clear_xattr_subsystem(c)
709 * is used to release any xattr related objects.
710 * jffs2_build_xattr_subsystem(c)
711 * is used to associate xdatum and xref while super block building process.
712 * jffs2_setup_xattr_datum(c, xid, version)
713 * is used to insert xdatum while scanning process.
714 * -------------------------------------------------- */
715void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
716{
717 int i;
718
719 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
720 INIT_LIST_HEAD(&c->xattrindex[i]);
721 INIT_LIST_HEAD(&c->xattr_unchecked);
722 c->xref_temp = NULL;
723
724 init_rwsem(&c->xattr_sem);
725 c->xdatum_mem_usage = 0;
726 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
727}
728
729static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
730{
731 struct jffs2_xattr_datum *xd;
732 int i = xid % XATTRINDEX_HASHSIZE;
733
734 /* It's only used in scanning/building process. */
735 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
736
737 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
738 if (xd->xid==xid)
739 return xd;
740 }
741 return NULL;
742}
743
744void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
745{
746 struct jffs2_xattr_datum *xd, *_xd;
747 struct jffs2_xattr_ref *ref, *_ref;
748 int i;
749
750 for (ref=c->xref_temp; ref; ref = _ref) {
751 _ref = ref->next;
752 jffs2_free_xattr_ref(ref);
753 }
754 c->xref_temp = NULL;
755
756 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
757 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
758 list_del(&xd->xindex);
759 if (xd->xname)
760 kfree(xd->xname);
761 jffs2_free_xattr_datum(xd);
762 }
763 }
764}
765
766void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
767{
768 struct jffs2_xattr_ref *ref, *_ref;
769 struct jffs2_xattr_datum *xd, *_xd;
770 struct jffs2_inode_cache *ic;
771 int i, xdatum_count =0, xdatum_unchecked_count = 0, xref_count = 0;
772
773 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
774
775 /* Phase.1 */
776 for (ref=c->xref_temp; ref; ref=_ref) {
777 _ref = ref->next;
778 /* checking REF_UNCHECKED nodes */
779 if (ref_flags(ref->node) != REF_PRISTINE) {
780 if (verify_xattr_ref(c, ref)) {
781 delete_xattr_ref_node(c, ref);
782 jffs2_free_xattr_ref(ref);
783 continue;
784 }
785 }
786 /* At this point, ref->xid and ref->ino contain XID and inode number.
787 ref->xd and ref->ic are not valid yet. */
788 xd = jffs2_find_xattr_datum(c, ref->xid);
789 ic = jffs2_get_ino_cache(c, ref->ino);
790 if (!xd || !ic) {
791 if (ref_flags(ref->node) != REF_UNCHECKED)
792 JFFS2_WARNING("xref(ino=%u, xid=%u) is orphan. \n",
793 ref->ino, ref->xid);
794 delete_xattr_ref_node(c, ref);
795 jffs2_free_xattr_ref(ref);
796 continue;
797 }
798 ref->xd = xd;
799 ref->ic = ic;
800 xd->refcnt++;
801 ref->next = ic->xref;
802 ic->xref = ref;
803 xref_count++;
804 }
805 c->xref_temp = NULL;
806 /* After this, ref->xid/ino are NEVER used. */
807
808 /* Phase.2 */
809 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
810 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
811 list_del_init(&xd->xindex);
812 if (!xd->refcnt) {
813 if (ref_flags(xd->node) != REF_UNCHECKED)
814 JFFS2_WARNING("orphan xdatum(xid=%u, version=%u) at %#08x\n",
815 xd->xid, xd->version, ref_offset(xd->node));
816 delete_xattr_datum(c, xd);
817 continue;
818 }
819 if (ref_flags(xd->node) != REF_PRISTINE) {
820 dbg_xattr("unchecked xdatum(xid=%u) at %#08x\n",
821 xd->xid, ref_offset(xd->node));
822 list_add(&xd->xindex, &c->xattr_unchecked);
823 xdatum_unchecked_count++;
824 }
825 xdatum_count++;
826 }
827 }
828 /* build complete */
829 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum (%u unchecked) and "
830 "%u of xref found.\n", xdatum_count, xdatum_unchecked_count, xref_count);
831}
832
833struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
834 uint32_t xid, uint32_t version)
835{
836 struct jffs2_xattr_datum *xd, *_xd;
837
838 _xd = jffs2_find_xattr_datum(c, xid);
839 if (_xd) {
840 dbg_xattr("duplicate xdatum (xid=%u, version=%u/%u) at %#08x\n",
841 xid, version, _xd->version, ref_offset(_xd->node));
842 if (version < _xd->version)
843 return ERR_PTR(-EEXIST);
844 }
845 xd = jffs2_alloc_xattr_datum();
846 if (!xd)
847 return ERR_PTR(-ENOMEM);
848 xd->xid = xid;
849 xd->version = version;
850 if (xd->xid > c->highest_xid)
851 c->highest_xid = xd->xid;
852 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
853
854 if (_xd) {
855 list_del_init(&_xd->xindex);
856 delete_xattr_datum_node(c, _xd);
857 jffs2_free_xattr_datum(_xd);
858 }
859 return xd;
860}
861
862/* -------- xattr subsystem functions ---------------
863 * xprefix_to_handler(xprefix)
864 * is used to translate xprefix into xattr_handler.
865 * jffs2_listxattr(dentry, buffer, size)
866 * is an implementation of listxattr handler on jffs2.
867 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
868 * is an implementation of getxattr handler on jffs2.
869 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
870 * is an implementation of setxattr handler on jffs2.
871 * -------------------------------------------------- */
872struct xattr_handler *jffs2_xattr_handlers[] = {
873 &jffs2_user_xattr_handler,
874#ifdef CONFIG_JFFS2_FS_SECURITY
875 &jffs2_security_xattr_handler,
876#endif
877#ifdef CONFIG_JFFS2_FS_POSIX_ACL
878 &jffs2_acl_access_xattr_handler,
879 &jffs2_acl_default_xattr_handler,
880#endif
881 &jffs2_trusted_xattr_handler,
882 NULL
883};
884
885static struct xattr_handler *xprefix_to_handler(int xprefix) {
886 struct xattr_handler *ret;
887
888 switch (xprefix) {
889 case JFFS2_XPREFIX_USER:
890 ret = &jffs2_user_xattr_handler;
891 break;
892#ifdef CONFIG_JFFS2_FS_SECURITY
893 case JFFS2_XPREFIX_SECURITY:
894 ret = &jffs2_security_xattr_handler;
895 break;
896#endif
897#ifdef CONFIG_JFFS2_FS_POSIX_ACL
898 case JFFS2_XPREFIX_ACL_ACCESS:
899 ret = &jffs2_acl_access_xattr_handler;
900 break;
901 case JFFS2_XPREFIX_ACL_DEFAULT:
902 ret = &jffs2_acl_default_xattr_handler;
903 break;
904#endif
905 case JFFS2_XPREFIX_TRUSTED:
906 ret = &jffs2_trusted_xattr_handler;
907 break;
908 default:
909 ret = NULL;
910 break;
911 }
912 return ret;
913}
914
915ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
916{
917 struct inode *inode = dentry->d_inode;
918 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
919 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
920 struct jffs2_inode_cache *ic = f->inocache;
921 struct jffs2_xattr_ref *ref, **pref;
922 struct jffs2_xattr_datum *xd;
923 struct xattr_handler *xhandle;
924 ssize_t len, rc;
925 int retry = 0;
926
927 rc = check_xattr_ref_inode(c, ic);
928 if (unlikely(rc))
929 return rc;
930
931 down_read(&c->xattr_sem);
932 retry:
933 len = 0;
934 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
935 BUG_ON(ref->ic != ic);
936 xd = ref->xd;
937 if (!xd->xname) {
938 /* xdatum is unchached */
939 if (!retry) {
940 retry = 1;
941 up_read(&c->xattr_sem);
942 down_write(&c->xattr_sem);
943 goto retry;
944 } else {
945 rc = load_xattr_datum(c, xd);
946 if (unlikely(rc > 0)) {
947 *pref = ref->next;
948 delete_xattr_ref(c, ref);
949 goto retry;
950 } else if (unlikely(rc < 0))
951 goto out;
952 }
953 }
954 xhandle = xprefix_to_handler(xd->xprefix);
955 if (!xhandle)
956 continue;
957 if (buffer) {
958 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
959 } else {
960 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
961 }
962 if (rc < 0)
963 goto out;
964 len += rc;
965 }
966 rc = len;
967 out:
968 if (!retry) {
969 up_read(&c->xattr_sem);
970 } else {
971 up_write(&c->xattr_sem);
972 }
973 return rc;
974}
975
976int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
977 char *buffer, size_t size)
978{
979 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
980 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
981 struct jffs2_inode_cache *ic = f->inocache;
982 struct jffs2_xattr_datum *xd;
983 struct jffs2_xattr_ref *ref, **pref;
984 int rc, retry = 0;
985
986 rc = check_xattr_ref_inode(c, ic);
987 if (unlikely(rc))
988 return rc;
989
990 down_read(&c->xattr_sem);
991 retry:
992 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
993 BUG_ON(ref->ic!=ic);
994
995 xd = ref->xd;
996 if (xd->xprefix != xprefix)
997 continue;
998 if (!xd->xname) {
999 /* xdatum is unchached */
1000 if (!retry) {
1001 retry = 1;
1002 up_read(&c->xattr_sem);
1003 down_write(&c->xattr_sem);
1004 goto retry;
1005 } else {
1006 rc = load_xattr_datum(c, xd);
1007 if (unlikely(rc > 0)) {
1008 *pref = ref->next;
1009 delete_xattr_ref(c, ref);
1010 goto retry;
1011 } else if (unlikely(rc < 0)) {
1012 goto out;
1013 }
1014 }
1015 }
1016 if (!strcmp(xname, xd->xname)) {
1017 rc = xd->value_len;
1018 if (buffer) {
1019 if (size < rc) {
1020 rc = -ERANGE;
1021 } else {
1022 memcpy(buffer, xd->xvalue, rc);
1023 }
1024 }
1025 goto out;
1026 }
1027 }
1028 rc = -ENODATA;
1029 out:
1030 if (!retry) {
1031 up_read(&c->xattr_sem);
1032 } else {
1033 up_write(&c->xattr_sem);
1034 }
1035 return rc;
1036}
1037
1038int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1039 const char *buffer, size_t size, int flags)
1040{
1041 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1042 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1043 struct jffs2_inode_cache *ic = f->inocache;
1044 struct jffs2_xattr_datum *xd;
1045 struct jffs2_xattr_ref *ref, *newref, **pref;
1046 uint32_t length, request;
1047 int rc;
1048
1049 rc = check_xattr_ref_inode(c, ic);
1050 if (unlikely(rc))
1051 return rc;
1052
1053 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1054 rc = jffs2_reserve_space(c, request, &length,
1055 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1056 if (rc) {
1057 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1058 return rc;
1059 }
1060
1061 /* Find existing xattr */
1062 down_write(&c->xattr_sem);
1063 retry:
1064 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1065 xd = ref->xd;
1066 if (xd->xprefix != xprefix)
1067 continue;
1068 if (!xd->xname) {
1069 rc = load_xattr_datum(c, xd);
1070 if (unlikely(rc > 0)) {
1071 *pref = ref->next;
1072 delete_xattr_ref(c, ref);
1073 goto retry;
1074 } else if (unlikely(rc < 0))
1075 goto out;
1076 }
1077 if (!strcmp(xd->xname, xname)) {
1078 if (flags & XATTR_CREATE) {
1079 rc = -EEXIST;
1080 goto out;
1081 }
1082 if (!buffer) {
1083 *pref = ref->next;
1084 delete_xattr_ref(c, ref);
1085 rc = 0;
1086 goto out;
1087 }
1088 goto found;
1089 }
1090 }
1091 /* not found */
1092 if (flags & XATTR_REPLACE) {
1093 rc = -ENODATA;
1094 goto out;
1095 }
1096 if (!buffer) {
1097 rc = -EINVAL;
1098 goto out;
1099 }
1100 found:
1101 xd = create_xattr_datum(c, xprefix, xname, buffer, size);
1102 if (IS_ERR(xd)) {
1103 rc = PTR_ERR(xd);
1104 goto out;
1105 }
1106 up_write(&c->xattr_sem);
1107 jffs2_complete_reservation(c);
1108
1109 /* create xattr_ref */
1110 request = PAD(sizeof(struct jffs2_raw_xref));
1111 rc = jffs2_reserve_space(c, request, &length,
1112 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
1113 if (rc) {
1114 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1115 down_write(&c->xattr_sem);
1116 xd->refcnt--;
1117 if (!xd->refcnt)
1118 delete_xattr_datum(c, xd);
1119 up_write(&c->xattr_sem);
1120 return rc;
1121 }
1122 down_write(&c->xattr_sem);
1123 if (ref)
1124 *pref = ref->next;
1125 newref = create_xattr_ref(c, ic, xd);
1126 if (IS_ERR(newref)) {
1127 if (ref) {
1128 ref->next = ic->xref;
1129 ic->xref = ref;
1130 }
1131 rc = PTR_ERR(newref);
1132 xd->refcnt--;
1133 if (!xd->refcnt)
1134 delete_xattr_datum(c, xd);
1135 } else if (ref) {
1136 delete_xattr_ref(c, ref);
1137 }
1138 out:
1139 up_write(&c->xattr_sem);
1140 jffs2_complete_reservation(c);
1141 return rc;
1142}
1143
1144/* -------- garbage collector functions -------------
1145 * jffs2_garbage_collect_xattr_datum(c, xd)
1146 * is used to move xdatum into new node.
1147 * jffs2_garbage_collect_xattr_ref(c, ref)
1148 * is used to move xref into new node.
1149 * jffs2_verify_xattr(c)
1150 * is used to call do_verify_xattr_datum() before garbage collecting.
1151 * -------------------------------------------------- */
1152int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
1153{
1154 uint32_t totlen, length, old_ofs;
1155 int rc = -EINVAL;
1156
1157 down_write(&c->xattr_sem);
1158 BUG_ON(!xd->node);
1159
1160 old_ofs = ref_offset(xd->node);
1161 totlen = ref_totlen(c, c->gcblock, xd->node);
1162 if (totlen < sizeof(struct jffs2_raw_xattr))
1163 goto out;
1164
1165 if (!xd->xname) {
1166 rc = load_xattr_datum(c, xd);
1167 if (unlikely(rc > 0)) {
1168 delete_xattr_datum_node(c, xd);
1169 rc = 0;
1170 goto out;
1171 } else if (unlikely(rc < 0))
1172 goto out;
1173 }
1174 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
1175 if (rc || length < totlen) {
1176 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, totlen);
1177 rc = rc ? rc : -EBADFD;
1178 goto out;
1179 }
1180 rc = save_xattr_datum(c, xd);
1181 if (!rc)
1182 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1183 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1184 out:
1185 up_write(&c->xattr_sem);
1186 return rc;
1187}
1188
1189
1190int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
1191{
1192 uint32_t totlen, length, old_ofs;
1193 int rc = -EINVAL;
1194
1195 down_write(&c->xattr_sem);
1196 BUG_ON(!ref->node);
1197
1198 old_ofs = ref_offset(ref->node);
1199 totlen = ref_totlen(c, c->gcblock, ref->node);
1200 if (totlen != sizeof(struct jffs2_raw_xref))
1201 goto out;
1202
1203 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
1204 if (rc || length < totlen) {
1205 JFFS2_WARNING("%s: jffs2_reserve_space() = %d, request = %u\n",
1206 __FUNCTION__, rc, totlen);
1207 rc = rc ? rc : -EBADFD;
1208 goto out;
1209 }
1210 rc = save_xattr_ref(c, ref);
1211 if (!rc)
1212 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1213 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1214 out:
1215 up_write(&c->xattr_sem);
1216 return rc;
1217}
1218
1219int jffs2_verify_xattr(struct jffs2_sb_info *c)
1220{
1221 struct jffs2_xattr_datum *xd, *_xd;
1222 int rc;
1223
1224 down_write(&c->xattr_sem);
1225 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1226 rc = do_verify_xattr_datum(c, xd);
1227 if (rc == 0) {
1228 list_del_init(&xd->xindex);
1229 break;
1230 } else if (rc > 0) {
1231 list_del_init(&xd->xindex);
1232 delete_xattr_datum_node(c, xd);
1233 }
1234 }
1235 up_write(&c->xattr_sem);
1236
1237 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1238}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 23:09:28 -0500