2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2006 NEC Corporation
6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
8 * For licensing information, see the file 'LICENCE' in this directory.
11 #include <linux/kernel.h>
12 #include <linux/slab.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>
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_delay(c, xd)
54 * is used to delete a xdatum without 'delete marker'. It has a possibility to detect
55 * orphan xdatum on next mounting.
56 * delete_xattr_datum(c, xd)
57 * is used to delete a xdatum with 'delete marker'. Calling jffs2_reserve_space() is
58 * necessary before this function.
59 * -------------------------------------------------- */
60 static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)
62 int name_len = strlen(xname);
64 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize);
67 static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
69 struct jffs2_raw_node_ref *raw;
72 spin_lock(&c->erase_completion_lock);
73 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
74 if (ref_flags(raw) == REF_UNCHECKED) {
79 spin_unlock(&c->erase_completion_lock);
83 static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
85 /* must be called under down_write(xattr_sem) */
86 D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version));
88 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);
92 list_del_init(&xd->xindex);
98 static void reclaim_xattr_datum(struct jffs2_sb_info *c)
100 /* must be called under down_write(xattr_sem) */
101 struct jffs2_xattr_datum *xd, *_xd;
102 uint32_t target, before;
103 static int index = 0;
106 if (c->xdatum_mem_threshold > c->xdatum_mem_usage)
109 before = c->xdatum_mem_usage;
110 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */
111 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {
112 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {
113 if (xd->flags & JFFS2_XFLAGS_HOT) {
114 xd->flags &= ~JFFS2_XFLAGS_HOT;
115 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {
116 unload_xattr_datum(c, xd);
118 if (c->xdatum_mem_usage <= target)
121 index = (index+1) % XATTRINDEX_HASHSIZE;
124 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",
125 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
128 static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
130 /* must be called under down_write(xattr_sem) */
131 struct jffs2_eraseblock *jeb;
132 struct jffs2_raw_node_ref *raw;
133 struct jffs2_raw_xattr rx;
135 uint32_t crc, offset, totlen;
138 spin_lock(&c->erase_completion_lock);
139 offset = ref_offset(xd->node);
140 if (ref_flags(xd->node) == REF_PRISTINE)
142 spin_unlock(&c->erase_completion_lock);
144 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx);
145 if (rc || readlen != sizeof(rx)) {
146 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
147 rc, sizeof(rx), readlen, offset);
148 return rc ? rc : -EIO;
150 crc = crc32(0, &rx, sizeof(rx) - 4);
151 if (crc != je32_to_cpu(rx.node_crc)) {
152 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
153 offset, je32_to_cpu(rx.hdr_crc), crc);
154 xd->flags |= JFFS2_XFLAGS_INVALID;
158 if (xd->version != XDATUM_DELETE_MARKER)
159 totlen += rx.name_len + 1 + je16_to_cpu(rx.value_len);
160 totlen = PAD(totlen);
161 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK
162 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR
163 || je32_to_cpu(rx.totlen) != totlen
164 || je32_to_cpu(rx.xid) != xd->xid
165 || je32_to_cpu(rx.version) != xd->version) {
166 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "
167 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",
168 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
169 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,
170 je32_to_cpu(rx.totlen), totlen,
171 je32_to_cpu(rx.xid), xd->xid,
172 je32_to_cpu(rx.version), xd->version);
173 xd->flags |= JFFS2_XFLAGS_INVALID;
176 xd->xprefix = rx.xprefix;
177 xd->name_len = rx.name_len;
178 xd->value_len = je16_to_cpu(rx.value_len);
179 xd->data_crc = je32_to_cpu(rx.data_crc);
181 spin_lock(&c->erase_completion_lock);
183 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
184 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
185 totlen = PAD(ref_totlen(c, jeb, raw));
186 if (ref_flags(raw) == REF_UNCHECKED) {
187 c->unchecked_size -= totlen; c->used_size += totlen;
188 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
190 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL);
192 spin_unlock(&c->erase_completion_lock);
194 /* unchecked xdatum is chained with c->xattr_unchecked */
195 list_del_init(&xd->xindex);
197 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",
198 xd->xid, xd->version);
203 static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
205 /* must be called under down_write(xattr_sem) */
208 uint32_t crc, length;
209 int i, ret, retry = 0;
211 BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
212 BUG_ON(!list_empty(&xd->xindex));
214 length = xd->name_len + 1 + xd->value_len;
215 data = kmalloc(length, GFP_KERNEL);
219 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),
220 length, &readlen, data);
222 if (ret || length!=readlen) {
223 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n",
224 ret, length, readlen, ref_offset(xd->node));
226 return ret ? ret : -EIO;
229 data[xd->name_len] = '\0';
230 crc = crc32(0, data, length);
231 if (crc != xd->data_crc) {
232 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)"
233 " at %#08x, read: 0x%08x calculated: 0x%08x\n",
234 ref_offset(xd->node), xd->data_crc, crc);
236 xd->flags |= JFFS2_XFLAGS_INVALID;
240 xd->flags |= JFFS2_XFLAGS_HOT;
242 xd->xvalue = data + xd->name_len+1;
244 c->xdatum_mem_usage += length;
246 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);
247 i = xd->hashkey % XATTRINDEX_HASHSIZE;
248 list_add(&xd->xindex, &c->xattrindex[i]);
251 reclaim_xattr_datum(c);
256 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",
257 xd->xid, xd->xprefix, xd->xname);
262 static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
264 /* must be called under down_write(xattr_sem);
265 * rc < 0 : recoverable error, try again
267 * rc > 0 : Unrecoverable error, this node should be deleted.
273 if (xd->flags & JFFS2_XFLAGS_INVALID)
275 if (unlikely(is_xattr_datum_unchecked(c, xd)))
276 rc = do_verify_xattr_datum(c, xd);
278 rc = do_load_xattr_datum(c, xd);
282 static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
284 /* must be called under down_write(xattr_sem) */
285 struct jffs2_raw_xattr rx;
288 int rc, totlen, nvecs = 1;
289 uint32_t phys_ofs = write_ofs(c);
291 BUG_ON(is_xattr_datum_dead(xd) || (xd->flags & JFFS2_XFLAGS_INVALID)
292 ? !!xd->xname : !xd->xname);
294 vecs[0].iov_base = ℞
295 vecs[0].iov_len = totlen = sizeof(rx);
296 if (!is_xattr_datum_dead(xd) && !(xd->flags & JFFS2_XFLAGS_INVALID)) {
298 vecs[1].iov_base = xd->xname;
299 vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
300 totlen += vecs[1].iov_len;
302 /* Setup raw-xattr */
303 memset(&rx, 0, sizeof(rx));
304 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
305 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
306 rx.totlen = cpu_to_je32(PAD(totlen));
307 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
309 rx.xid = cpu_to_je32(xd->xid);
310 if (!is_xattr_datum_dead(xd) && !(xd->flags & JFFS2_XFLAGS_INVALID)) {
311 rx.version = cpu_to_je32(++xd->version);
312 rx.xprefix = xd->xprefix;
313 rx.name_len = xd->name_len;
314 rx.value_len = cpu_to_je16(xd->value_len);
315 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
317 rx.version = cpu_to_je32(XDATUM_DELETE_MARKER);
319 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
321 rc = jffs2_flash_writev(c, vecs, nvecs, phys_ofs, &length, 0);
322 if (rc || totlen != length) {
323 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",
324 rc, totlen, length, phys_ofs);
327 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);
332 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd);
334 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
335 xd->xid, xd->version, xd->xprefix, xd->xname);
340 static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
341 int xprefix, const char *xname,
342 const char *xvalue, int xsize)
344 /* must be called under down_write(xattr_sem) */
345 struct jffs2_xattr_datum *xd;
346 uint32_t hashkey, name_len;
350 /* Search xattr_datum has same xname/xvalue by index */
351 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
352 i = hashkey % XATTRINDEX_HASHSIZE;
353 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
354 if (xd->hashkey==hashkey
355 && xd->xprefix==xprefix
356 && xd->value_len==xsize
357 && !strcmp(xd->xname, xname)
358 && !memcmp(xd->xvalue, xvalue, xsize)) {
364 /* Not found, Create NEW XATTR-Cache */
365 name_len = strlen(xname);
367 xd = jffs2_alloc_xattr_datum();
369 return ERR_PTR(-ENOMEM);
371 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
373 jffs2_free_xattr_datum(xd);
374 return ERR_PTR(-ENOMEM);
377 memcpy(data + name_len + 1, xvalue, xsize);
380 xd->xid = ++c->highest_xid;
381 xd->flags |= JFFS2_XFLAGS_HOT;
382 xd->xprefix = xprefix;
384 xd->hashkey = hashkey;
386 xd->xvalue = data + name_len + 1;
387 xd->name_len = name_len;
388 xd->value_len = xsize;
389 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
391 rc = save_xattr_datum(c, xd);
394 jffs2_free_xattr_datum(xd);
398 /* Insert Hash Index */
399 i = hashkey % XATTRINDEX_HASHSIZE;
400 list_add(&xd->xindex, &c->xattrindex[i]);
402 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
403 reclaim_xattr_datum(c);
408 static void delete_xattr_datum_delay(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
410 /* must be called under down_write(xattr_sem) */
413 unload_xattr_datum(c, xd);
414 set_xattr_datum_dead(xd);
415 spin_lock(&c->erase_completion_lock);
416 list_add(&xd->xindex, &c->xattr_dead_list);
417 spin_unlock(&c->erase_completion_lock);
418 JFFS2_NOTICE("xdatum(xid=%u) was removed without delete marker. "
419 "An orphan xdatum may be detected on next mounting.\n", xd->xid);
422 static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
424 /* must be called under jffs2_reserve_space() and down_write(xattr_sem) */
428 unload_xattr_datum(c, xd);
429 set_xattr_datum_dead(xd);
430 rc = save_xattr_datum(c, xd);
432 JFFS2_NOTICE("xdatum(xid=%u) was removed without delete marker. "
433 "An orphan xdatum may be detected on next mounting.\n",
436 spin_lock(&c->erase_completion_lock);
437 list_add(&xd->xindex, &c->xattr_dead_list);
438 spin_unlock(&c->erase_completion_lock);
441 /* -------- xref 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)
452 * is used to write xref to medium.
453 * create_xattr_ref(c, ic, xd)
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_inode(c, ic)
460 * is used to confirm inode does not have duplicate xattr name/value pair.
461 * -------------------------------------------------- */
462 static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
464 struct jffs2_eraseblock *jeb;
465 struct jffs2_raw_node_ref *raw;
466 struct jffs2_raw_xref rr;
468 uint32_t crc, offset, totlen;
471 spin_lock(&c->erase_completion_lock);
472 if (ref_flags(ref->node) != REF_UNCHECKED)
474 offset = ref_offset(ref->node);
475 spin_unlock(&c->erase_completion_lock);
477 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);
478 if (rc || sizeof(rr) != readlen) {
479 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
480 rc, sizeof(rr), readlen, offset);
481 return rc ? rc : -EIO;
484 crc = crc32(0, &rr, sizeof(rr) - 4);
485 if (crc != je32_to_cpu(rr.node_crc)) {
486 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
487 offset, je32_to_cpu(rr.node_crc), crc);
490 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
491 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
492 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
493 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
494 "nodetype=%#04x/%#04x, totlen=%u/%zu\n",
495 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
496 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
497 je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
500 ref->ino = je32_to_cpu(rr.ino);
501 ref->xid = je32_to_cpu(rr.xid);
502 ref->xseqno = je32_to_cpu(rr.xseqno);
503 if (ref->xseqno > c->highest_xseqno)
504 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
506 spin_lock(&c->erase_completion_lock);
508 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {
509 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
510 totlen = PAD(ref_totlen(c, jeb, raw));
511 if (ref_flags(raw) == REF_UNCHECKED) {
512 c->unchecked_size -= totlen; c->used_size += totlen;
513 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
515 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);
517 spin_unlock(&c->erase_completion_lock);
519 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
520 ref->ino, ref->xid, ref_offset(ref->node));
524 static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
526 /* must be called under down_write(xattr_sem) */
527 struct jffs2_raw_xref rr;
529 uint32_t xseqno, phys_ofs = write_ofs(c);
532 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
533 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
534 rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
535 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
537 xseqno = (c->highest_xseqno += 2);
538 if (is_xattr_ref_dead(ref)) {
539 xseqno |= XREF_DELETE_MARKER;
540 rr.ino = cpu_to_je32(ref->ino);
541 rr.xid = cpu_to_je32(ref->xid);
543 rr.ino = cpu_to_je32(ref->ic->ino);
544 rr.xid = cpu_to_je32(ref->xd->xid);
546 rr.xseqno = cpu_to_je32(xseqno);
547 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
549 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
550 if (ret || sizeof(rr) != length) {
551 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
552 ret, sizeof(rr), length, phys_ofs);
553 ret = ret ? ret : -EIO;
555 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
560 ref->xseqno = xseqno;
561 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);
563 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
568 static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
569 struct jffs2_xattr_datum *xd)
571 /* must be called under down_write(xattr_sem) */
572 struct jffs2_xattr_ref *ref;
575 ref = jffs2_alloc_xattr_ref();
577 return ERR_PTR(-ENOMEM);
581 ret = save_xattr_ref(c, ref);
583 jffs2_free_xattr_ref(ref);
588 ref->next = ic->xref;
591 return ref; /* success */
594 static void delete_xattr_ref_delay(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
596 /* must be called under down_write(xattr_sem) */
597 struct jffs2_xattr_datum *xd;
599 set_xattr_ref_dead(ref);
601 ref->ino = ref->ic->ino;
602 ref->xid = ref->xd->xid;
603 spin_lock(&c->erase_completion_lock);
604 ref->next = c->xref_dead_list;
605 c->xref_dead_list = ref;
606 spin_unlock(&c->erase_completion_lock);
608 JFFS2_NOTICE("xref(ino=%u, xid=%u) was removed without delete marker. "
609 "An orphan xref may be detected on next mounting.\n",
613 delete_xattr_datum_delay(c, xd);
616 static int delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, int enforce)
618 /* must be called under jffs2_reserve_space() and down_write(xattr_sem) */
619 struct jffs2_inode_cache *ic;
620 struct jffs2_xattr_datum *xd;
624 set_xattr_ref_dead(ref);
629 rc = save_xattr_ref(c, ref);
632 clr_xattr_ref_dead(ref);
637 JFFS2_WARNING("could not write delete marker of xref(ino=%u, xid=%u). "
638 "An orphan xref may be detected on next mounting.\n",
639 ref->ic->ino, ref->xd->xid);
641 spin_lock(&c->erase_completion_lock);
642 ref->next = c->xref_dead_list;
643 c->xref_dead_list = ref;
644 spin_unlock(&c->erase_completion_lock);
651 unload_xattr_datum(c, xd);
652 up_write(&c->xattr_sem);
653 jffs2_complete_reservation(c);
655 rc = jffs2_reserve_space(c, PAD(sizeof(struct jffs2_raw_xattr)), &length,
656 ALLOC_DELETION, JFFS2_SUMMARY_XATTR_SIZE);
659 down_write(&c->xattr_sem);
660 delete_xattr_datum_delay(c, xd);
662 down_write(&c->xattr_sem);
663 delete_xattr_datum(c, xd);
668 void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
670 /* It's called from jffs2_clear_inode() on inode removing.
671 When an inode with XATTR is removed, those XATTRs must be removed. */
672 struct jffs2_xattr_ref *ref;
676 if (!ic || ic->nlink > 0)
679 down_read(&c->xattr_sem);
681 up_read(&c->xattr_sem);
684 up_read(&c->xattr_sem);
686 rc = jffs2_reserve_space(c, PAD(sizeof(struct jffs2_raw_xref)), &length,
687 ALLOC_DELETION, JFFS2_SUMMARY_XREF_SIZE);
688 down_write(&c->xattr_sem);
691 ic->xref = ref->next;
693 delete_xattr_ref_delay(c, ref);
695 delete_xattr_ref(c, ref, 1);
698 retry = ic->xref ? 1 : 0;
699 up_write(&c->xattr_sem);
701 jffs2_complete_reservation(c);
706 void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
708 /* It's called from jffs2_free_ino_caches() until unmounting FS. */
709 struct jffs2_xattr_datum *xd;
710 struct jffs2_xattr_ref *ref, *_ref;
712 down_write(&c->xattr_sem);
713 for (ref = ic->xref; ref; ref = _ref) {
718 unload_xattr_datum(c, xd);
719 jffs2_free_xattr_datum(xd);
721 jffs2_free_xattr_ref(ref);
724 up_write(&c->xattr_sem);
727 static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
729 /* success of check_xattr_ref_inode() means taht inode (ic) dose not have
730 * duplicate name/value pairs. If duplicate name/value pair would be found,
731 * one will be removed.
733 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
736 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
738 down_write(&c->xattr_sem);
741 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
742 if (!ref->xd->xname) {
743 rc = load_xattr_datum(c, ref->xd);
744 if (unlikely(rc > 0)) {
746 delete_xattr_ref_delay(c, ref);
748 } else if (unlikely(rc < 0))
751 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
752 if (!cmp->xd->xname) {
753 ref->xd->flags |= JFFS2_XFLAGS_BIND;
754 rc = load_xattr_datum(c, cmp->xd);
755 ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
756 if (unlikely(rc > 0)) {
758 delete_xattr_ref_delay(c, cmp);
760 } else if (unlikely(rc < 0))
763 if (ref->xd->xprefix == cmp->xd->xprefix
764 && !strcmp(ref->xd->xname, cmp->xd->xname)) {
765 if (ref->xseqno > cmp->xseqno) {
767 delete_xattr_ref_delay(c, cmp);
770 delete_xattr_ref_delay(c, ref);
776 ic->flags |= INO_FLAGS_XATTR_CHECKED;
778 up_write(&c->xattr_sem);
783 /* -------- xattr subsystem functions ---------------
784 * jffs2_init_xattr_subsystem(c)
785 * is used to initialize semaphore and list_head, and some variables.
786 * jffs2_find_xattr_datum(c, xid)
787 * is used to lookup xdatum while scanning process.
788 * jffs2_clear_xattr_subsystem(c)
789 * is used to release any xattr related objects.
790 * jffs2_build_xattr_subsystem(c)
791 * is used to associate xdatum and xref while super block building process.
792 * jffs2_setup_xattr_datum(c, xid, version)
793 * is used to insert xdatum while scanning process.
794 * -------------------------------------------------- */
795 void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
799 for (i=0; i < XATTRINDEX_HASHSIZE; i++)
800 INIT_LIST_HEAD(&c->xattrindex[i]);
801 INIT_LIST_HEAD(&c->xattr_unchecked);
802 INIT_LIST_HEAD(&c->xattr_dead_list);
803 c->xref_dead_list = NULL;
806 init_rwsem(&c->xattr_sem);
808 c->highest_xseqno = 0;
809 c->xdatum_mem_usage = 0;
810 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
813 static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
815 struct jffs2_xattr_datum *xd;
816 int i = xid % XATTRINDEX_HASHSIZE;
818 /* It's only used in scanning/building process. */
819 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
821 list_for_each_entry(xd, &c->xattrindex[i], xindex) {
828 void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
830 struct jffs2_xattr_datum *xd, *_xd;
831 struct jffs2_xattr_ref *ref, *_ref;
834 for (ref=c->xref_temp; ref; ref = _ref) {
836 jffs2_free_xattr_ref(ref);
839 for (ref=c->xref_dead_list; ref; ref = _ref) {
841 jffs2_free_xattr_ref(ref);
844 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
845 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
846 list_del(&xd->xindex);
849 jffs2_free_xattr_datum(xd);
853 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
854 list_del(&xd->xindex);
855 jffs2_free_xattr_datum(xd);
859 #define XREF_TMPHASH_SIZE (128)
860 void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
862 struct jffs2_xattr_ref *ref, *_ref;
863 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
864 struct jffs2_xattr_datum *xd, *_xd;
865 struct jffs2_inode_cache *ic;
866 struct jffs2_raw_node_ref *raw;
867 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
869 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
870 /* Phase.1 : Drop dead xdatum */
871 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
872 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
873 BUG_ON(xd->node == (void *)xd);
874 if (is_xattr_datum_dead(xd)) {
875 list_del_init(&xd->xindex);
876 list_add(&xd->xindex, &c->xattr_unchecked);
881 /* Phase.2 : Merge same xref */
882 for (i=0; i < XREF_TMPHASH_SIZE; i++)
883 xref_tmphash[i] = NULL;
884 for (ref=c->xref_temp; ref; ref=_ref) {
885 struct jffs2_xattr_ref *tmp;
888 if (ref_flags(ref->node) != REF_PRISTINE) {
889 if (verify_xattr_ref(c, ref)) {
890 BUG_ON(ref->node->next_in_ino != (void *)ref);
891 ref->node->next_in_ino = NULL;
892 jffs2_mark_node_obsolete(c, ref->node);
893 jffs2_free_xattr_ref(ref);
898 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
899 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
900 if (tmp->ino == ref->ino && tmp->xid == ref->xid)
905 if (ref->xseqno > tmp->xseqno) {
906 tmp->xseqno = ref->xseqno;
907 raw->next_in_ino = tmp->node;
910 raw->next_in_ino = tmp->node->next_in_ino;
911 tmp->node->next_in_ino = raw;
913 jffs2_free_xattr_ref(ref);
916 ref->next = xref_tmphash[i];
917 xref_tmphash[i] = ref;
922 /* Phase.3 : Bind xref with inode_cache and xattr_datum */
923 for (i=0; i < XREF_TMPHASH_SIZE; i++) {
924 for (ref=xref_tmphash[i]; ref; ref=_ref) {
926 if (is_xattr_ref_dead(ref)) {
927 ref->next = c->xref_dead_list;
928 c->xref_dead_list = ref;
931 /* At this point, ref->xid and ref->ino contain XID and inode number.
932 ref->xd and ref->ic are not valid yet. */
933 xd = jffs2_find_xattr_datum(c, ref->xid);
934 ic = jffs2_get_ino_cache(c, ref->ino);
936 JFFS2_WARNING("xref(ino=%u, xid=%u, xseqno=%u) is orphan. \n",
937 ref->ino, ref->xid, ref->xseqno);
938 set_xattr_ref_dead(ref);
939 ref->next = c->xref_dead_list;
940 c->xref_dead_list = ref;
946 ref->next = ic->xref;
952 /* Phase.4 : Link unchecked xdatum to xattr_unchecked list */
953 for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
954 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
955 list_del_init(&xd->xindex);
957 JFFS2_WARNING("orphan xdatum(xid=%u, version=%u)\n",
958 xd->xid, xd->version);
959 set_xattr_datum_dead(xd);
960 list_add(&xd->xindex, &c->xattr_unchecked);
963 if (is_xattr_datum_unchecked(c, xd)) {
964 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
965 xd->xid, xd->version);
966 list_add(&xd->xindex, &c->xattr_unchecked);
967 xdatum_unchecked_count++;
973 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum (%u unchecked) and "
974 "%u of xref found.\n", xdatum_count, xdatum_unchecked_count, xref_count);
977 struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
978 uint32_t xid, uint32_t version)
980 struct jffs2_xattr_datum *xd;
982 xd = jffs2_find_xattr_datum(c, xid);
984 xd = jffs2_alloc_xattr_datum();
986 return ERR_PTR(-ENOMEM);
988 xd->version = version;
989 if (xd->xid > c->highest_xid)
990 c->highest_xid = xd->xid;
991 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
996 /* -------- xattr subsystem functions ---------------
997 * xprefix_to_handler(xprefix)
998 * is used to translate xprefix into xattr_handler.
999 * jffs2_listxattr(dentry, buffer, size)
1000 * is an implementation of listxattr handler on jffs2.
1001 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
1002 * is an implementation of getxattr handler on jffs2.
1003 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
1004 * is an implementation of setxattr handler on jffs2.
1005 * -------------------------------------------------- */
1006 struct xattr_handler *jffs2_xattr_handlers[] = {
1007 &jffs2_user_xattr_handler,
1008 #ifdef CONFIG_JFFS2_FS_SECURITY
1009 &jffs2_security_xattr_handler,
1011 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
1012 &jffs2_acl_access_xattr_handler,
1013 &jffs2_acl_default_xattr_handler,
1015 &jffs2_trusted_xattr_handler,
1019 static struct xattr_handler *xprefix_to_handler(int xprefix) {
1020 struct xattr_handler *ret;
1023 case JFFS2_XPREFIX_USER:
1024 ret = &jffs2_user_xattr_handler;
1026 #ifdef CONFIG_JFFS2_FS_SECURITY
1027 case JFFS2_XPREFIX_SECURITY:
1028 ret = &jffs2_security_xattr_handler;
1031 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
1032 case JFFS2_XPREFIX_ACL_ACCESS:
1033 ret = &jffs2_acl_access_xattr_handler;
1035 case JFFS2_XPREFIX_ACL_DEFAULT:
1036 ret = &jffs2_acl_default_xattr_handler;
1039 case JFFS2_XPREFIX_TRUSTED:
1040 ret = &jffs2_trusted_xattr_handler;
1049 ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1051 struct inode *inode = dentry->d_inode;
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_ref *ref, **pref;
1056 struct jffs2_xattr_datum *xd;
1057 struct xattr_handler *xhandle;
1061 rc = check_xattr_ref_inode(c, ic);
1065 down_read(&c->xattr_sem);
1068 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1069 BUG_ON(ref->ic != ic);
1072 /* xdatum is unchached */
1075 up_read(&c->xattr_sem);
1076 down_write(&c->xattr_sem);
1079 rc = load_xattr_datum(c, xd);
1080 if (unlikely(rc > 0)) {
1082 delete_xattr_ref_delay(c, ref);
1084 } else if (unlikely(rc < 0))
1088 xhandle = xprefix_to_handler(xd->xprefix);
1092 rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
1094 rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
1103 up_read(&c->xattr_sem);
1105 up_write(&c->xattr_sem);
1110 int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
1111 char *buffer, size_t size)
1113 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1114 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1115 struct jffs2_inode_cache *ic = f->inocache;
1116 struct jffs2_xattr_datum *xd;
1117 struct jffs2_xattr_ref *ref, **pref;
1120 rc = check_xattr_ref_inode(c, ic);
1124 down_read(&c->xattr_sem);
1126 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1127 BUG_ON(ref->ic!=ic);
1130 if (xd->xprefix != xprefix)
1133 /* xdatum is unchached */
1136 up_read(&c->xattr_sem);
1137 down_write(&c->xattr_sem);
1140 rc = load_xattr_datum(c, xd);
1141 if (unlikely(rc > 0)) {
1143 delete_xattr_ref_delay(c, ref);
1145 } else if (unlikely(rc < 0)) {
1150 if (!strcmp(xname, xd->xname)) {
1156 memcpy(buffer, xd->xvalue, rc);
1165 up_read(&c->xattr_sem);
1167 up_write(&c->xattr_sem);
1172 int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
1173 const char *buffer, size_t size, int flags)
1175 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
1176 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
1177 struct jffs2_inode_cache *ic = f->inocache;
1178 struct jffs2_xattr_datum *xd;
1179 struct jffs2_xattr_ref *ref, *newref, **pref;
1180 uint32_t length, request;
1183 rc = check_xattr_ref_inode(c, ic);
1187 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
1188 rc = jffs2_reserve_space(c, request, &length,
1189 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
1191 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1195 /* Find existing xattr */
1196 down_write(&c->xattr_sem);
1198 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
1200 if (xd->xprefix != xprefix)
1203 rc = load_xattr_datum(c, xd);
1204 if (unlikely(rc > 0)) {
1206 delete_xattr_ref_delay(c, ref);
1208 } else if (unlikely(rc < 0))
1211 if (!strcmp(xd->xname, xname)) {
1212 if (flags & XATTR_CREATE) {
1218 rc = delete_xattr_ref(c, ref, 0);
1225 if (flags & XATTR_REPLACE) {
1234 xd = create_xattr_datum(c, xprefix, xname, buffer, size);
1239 up_write(&c->xattr_sem);
1240 jffs2_complete_reservation(c);
1242 /* create xattr_ref */
1243 request = PAD(sizeof(struct jffs2_raw_xref));
1244 rc = jffs2_reserve_space(c, request, &length,
1245 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
1246 down_write(&c->xattr_sem);
1248 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1251 delete_xattr_datum_delay(c, xd);
1252 up_write(&c->xattr_sem);
1257 newref = create_xattr_ref(c, ic, xd);
1258 if (IS_ERR(newref)) {
1260 ref->next = ic->xref;
1263 rc = PTR_ERR(newref);
1266 delete_xattr_datum_delay(c, xd);
1268 up_write(&c->xattr_sem);
1269 jffs2_complete_reservation(c);
1271 rc = jffs2_reserve_space(c, request, &length,
1272 ALLOC_DELETION, JFFS2_SUMMARY_XREF_SIZE);
1273 down_write(&c->xattr_sem);
1275 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
1276 delete_xattr_ref_delay(c, ref);
1277 up_write(&c->xattr_sem);
1280 delete_xattr_ref(c, ref, 1);
1283 up_write(&c->xattr_sem);
1284 jffs2_complete_reservation(c);
1288 /* -------- garbage collector functions -------------
1289 * jffs2_garbage_collect_xattr_datum(c, xd, raw)
1290 * is used to move xdatum into new node.
1291 * jffs2_garbage_collect_xattr_ref(c, ref, raw)
1292 * is used to move xref into new node.
1293 * jffs2_verify_xattr(c)
1294 * is used to call do_verify_xattr_datum() before garbage collecting.
1295 * -------------------------------------------------- */
1296 int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
1297 struct jffs2_raw_node_ref *raw)
1299 uint32_t totlen, length, old_ofs;
1302 down_write(&c->xattr_sem);
1303 if (xd->node != raw)
1305 if (is_xattr_datum_dead(xd) && (raw->next_in_ino == (void *)xd))
1308 old_ofs = ref_offset(xd->node);
1309 totlen = ref_totlen(c, c->gcblock, xd->node);
1311 if (!is_xattr_datum_dead(xd)) {
1312 rc = load_xattr_datum(c, xd);
1313 if (unlikely(rc < 0))
1317 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
1319 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
1320 rc = rc ? rc : -EBADFD;
1323 rc = save_xattr_datum(c, xd);
1325 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
1326 xd->xid, xd->version, old_ofs, ref_offset(xd->node));
1329 jffs2_mark_node_obsolete(c, raw);
1330 up_write(&c->xattr_sem);
1335 int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
1336 struct jffs2_raw_node_ref *raw)
1338 uint32_t totlen, length, old_ofs;
1341 down_write(&c->xattr_sem);
1344 if (ref->node != raw)
1346 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
1349 old_ofs = ref_offset(ref->node);
1350 totlen = ref_totlen(c, c->gcblock, ref->node);
1352 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
1354 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
1355 __FUNCTION__, rc, totlen);
1356 rc = rc ? rc : -EBADFD;
1359 rc = save_xattr_ref(c, ref);
1361 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
1362 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
1365 jffs2_mark_node_obsolete(c, raw);
1366 up_write(&c->xattr_sem);
1370 int jffs2_verify_xattr(struct jffs2_sb_info *c)
1372 struct jffs2_xattr_datum *xd, *_xd;
1373 struct jffs2_eraseblock *jeb;
1374 struct jffs2_raw_node_ref *raw;
1378 down_write(&c->xattr_sem);
1379 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
1380 rc = do_verify_xattr_datum(c, xd);
1383 list_del_init(&xd->xindex);
1384 spin_lock(&c->erase_completion_lock);
1385 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
1386 if (ref_flags(raw) != REF_UNCHECKED)
1388 jeb = &c->blocks[ref_offset(raw) / c->sector_size];
1389 totlen = PAD(ref_totlen(c, jeb, raw));
1390 c->unchecked_size -= totlen; c->used_size += totlen;
1391 jeb->unchecked_size -= totlen; jeb->used_size += totlen;
1392 raw->flash_offset = ref_offset(raw)
1393 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
1395 if (is_xattr_datum_dead(xd))
1396 list_add(&xd->xindex, &c->xattr_dead_list);
1397 spin_unlock(&c->erase_completion_lock);
1399 up_write(&c->xattr_sem);
1400 return list_empty(&c->xattr_unchecked) ? 1 : 0;
1403 void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
1405 /* must be called under spin_lock(&c->erase_completion_lock) */
1406 if (xd->node != (void *)xd)
1409 list_del(&xd->xindex);
1410 jffs2_free_xattr_datum(xd);
1413 void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
1415 /* must be called under spin_lock(&c->erase_completion_lock) */
1416 struct jffs2_xattr_ref *tmp, **ptmp;
1418 if (ref->node != (void *)ref)
1421 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
1424 jffs2_free_xattr_ref(ref);