1/* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright �� 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 12#include <linux/kernel.h> 13#include <linux/slab.h> 14#include <linux/fs.h> 15#include <linux/time.h> 16#include <linux/pagemap.h> 17#include <linux/highmem.h> 18#include <linux/crc32.h> 19#include <linux/jffs2.h> 20#include <linux/xattr.h> 21#include <linux/mtd/mtd.h> 22#include "nodelist.h" 23/* -------- xdatum related functions ---------------- 24 * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) 25 * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is 26 * the index of the xattr name/value pair cache (c->xattrindex). 27 * is_xattr_datum_unchecked(c, xd) 28 * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not 29 * unchecked, it returns 0. 30 * unload_xattr_datum(c, xd) 31 * is used to release xattr name/value pair and detach from c->xattrindex. 32 * reclaim_xattr_datum(c) 33 * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when 34 * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold 35 * is hard coded as 32KiB. 36 * do_verify_xattr_datum(c, xd) 37 * is used to load the xdatum informations without name/value pair from the medium. 38 * It's necessary once, because those informations are not collected during mounting 39 * process when EBS is enabled. 40 * 0 will be returned, if success. An negative return value means recoverable error, and 41 * positive return value means unrecoverable error. Thus, caller must remove this xdatum 42 * and xref when it returned positive value. 43 * do_load_xattr_datum(c, xd) 44 * is used to load name/value pair from the medium. 45 * The meanings of return value is same as do_verify_xattr_datum(). 46 * load_xattr_datum(c, xd) 47 * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). 48 * If xd need to call do_verify_xattr_datum() at first, it's called before calling 49 * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). 50 * save_xattr_datum(c, xd) 51 * is used to write xdatum to medium. xd->version will be incremented. 52 * create_xattr_datum(c, xprefix, xname, xvalue, xsize) 53 * is used to create new xdatum and write to medium. 54 * unrefer_xattr_datum(c, xd) 55 * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD 56 * is set on xd->flags and chained xattr_dead_list or release it immediately. 57 * In the first case, the garbage collector release it later. 58 * -------------------------------------------------- */ 59static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) 60{ 61 int name_len = strlen(xname); 62 63 return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); 64} 65 66static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 67{ 68 struct jffs2_raw_node_ref *raw; 69 int rc = 0; 70 71 spin_lock(&c->erase_completion_lock); 72 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 73 if (ref_flags(raw) == REF_UNCHECKED) { 74 rc = 1; 75 break; 76 } 77 } 78 spin_unlock(&c->erase_completion_lock); 79 return rc; 80} 81 82static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 83{ 84 /* must be called under down_write(xattr_sem) */ 85 D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); 86 if (xd->xname) { 87 c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); 88 kfree(xd->xname); 89 } 90 91 list_del_init(&xd->xindex); 92 xd->hashkey = 0; 93 xd->xname = NULL; 94 xd->xvalue = NULL; 95} 96 97static void reclaim_xattr_datum(struct jffs2_sb_info *c) 98{ 99 /* must be called under down_write(xattr_sem) */ 100 struct jffs2_xattr_datum *xd, *_xd; 101 uint32_t target, before; 102 static int index = 0; 103 int count; 104 105 if (c->xdatum_mem_threshold > c->xdatum_mem_usage) 106 return; 107 108 before = c->xdatum_mem_usage; 109 target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ 110 for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { 111 list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { 112 if (xd->flags & JFFS2_XFLAGS_HOT) { 113 xd->flags &= ~JFFS2_XFLAGS_HOT; 114 } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { 115 unload_xattr_datum(c, xd); 116 } 117 if (c->xdatum_mem_usage <= target) 118 goto out; 119 } 120 index = (index+1) % XATTRINDEX_HASHSIZE; 121 } 122 out: 123 JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", 124 before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); 125} 126 127static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 128{ 129 /* must be called under down_write(xattr_sem) */ 130 struct jffs2_eraseblock *jeb; 131 struct jffs2_raw_node_ref *raw; 132 struct jffs2_raw_xattr rx; 133 size_t readlen; 134 uint32_t crc, offset, totlen; 135 int rc; 136 137 spin_lock(&c->erase_completion_lock); 138 offset = ref_offset(xd->node); 139 if (ref_flags(xd->node) == REF_PRISTINE) 140 goto complete; 141 spin_unlock(&c->erase_completion_lock); 142 143 rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); 144 if (rc || readlen != sizeof(rx)) { 145 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", 146 rc, sizeof(rx), readlen, offset); 147 return rc ? rc : -EIO; 148 } 149 crc = crc32(0, &rx, sizeof(rx) - 4); 150 if (crc != je32_to_cpu(rx.node_crc)) { 151 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 152 offset, je32_to_cpu(rx.hdr_crc), crc); 153 xd->flags |= JFFS2_XFLAGS_INVALID; 154 return EIO; 155 } 156 totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); 157 if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK 158 || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR 159 || je32_to_cpu(rx.totlen) != totlen 160 || je32_to_cpu(rx.xid) != xd->xid 161 || je32_to_cpu(rx.version) != xd->version) { 162 JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " 163 "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", 164 offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, 165 je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, 166 je32_to_cpu(rx.totlen), totlen, 167 je32_to_cpu(rx.xid), xd->xid, 168 je32_to_cpu(rx.version), xd->version); 169 xd->flags |= JFFS2_XFLAGS_INVALID; 170 return EIO; 171 } 172 xd->xprefix = rx.xprefix; 173 xd->name_len = rx.name_len; 174 xd->value_len = je16_to_cpu(rx.value_len); 175 xd->data_crc = je32_to_cpu(rx.data_crc); 176 177 spin_lock(&c->erase_completion_lock); 178 complete: 179 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 180 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 181 totlen = PAD(ref_totlen(c, jeb, raw)); 182 if (ref_flags(raw) == REF_UNCHECKED) { 183 c->unchecked_size -= totlen; c->used_size += totlen; 184 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 185 } 186 raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); 187 } 188 spin_unlock(&c->erase_completion_lock); 189 190 /* unchecked xdatum is chained with c->xattr_unchecked */ 191 list_del_init(&xd->xindex); 192 193 dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", 194 xd->xid, xd->version); 195 196 return 0; 197} 198 199static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 200{ 201 /* must be called under down_write(xattr_sem) */ 202 char *data; 203 size_t readlen; 204 uint32_t crc, length; 205 int i, ret, retry = 0; 206 207 BUG_ON(ref_flags(xd->node) != REF_PRISTINE); 208 BUG_ON(!list_empty(&xd->xindex)); 209 retry: 210 length = xd->name_len + 1 + xd->value_len; 211 data = kmalloc(length, GFP_KERNEL); 212 if (!data) 213 return -ENOMEM; 214 215 ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), 216 length, &readlen, data); 217 218 if (ret || length!=readlen) { 219 JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", 220 ret, length, readlen, ref_offset(xd->node)); 221 kfree(data); 222 return ret ? ret : -EIO; 223 } 224 225 data[xd->name_len] = '\0'; 226 crc = crc32(0, data, length); 227 if (crc != xd->data_crc) { 228 JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" 229 " at %#08x, read: 0x%08x calculated: 0x%08x\n", 230 ref_offset(xd->node), xd->data_crc, crc); 231 kfree(data); 232 xd->flags |= JFFS2_XFLAGS_INVALID; 233 return EIO; 234 } 235 236 xd->flags |= JFFS2_XFLAGS_HOT; 237 xd->xname = data; 238 xd->xvalue = data + xd->name_len+1; 239 240 c->xdatum_mem_usage += length; 241 242 xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); 243 i = xd->hashkey % XATTRINDEX_HASHSIZE; 244 list_add(&xd->xindex, &c->xattrindex[i]); 245 if (!retry) { 246 retry = 1; 247 reclaim_xattr_datum(c); 248 if (!xd->xname) 249 goto retry; 250 } 251 252 dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", 253 xd->xid, xd->xprefix, xd->xname); 254 255 return 0; 256} 257 258static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 259{ 260 /* must be called under down_write(xattr_sem); 261 * rc < 0 : recoverable error, try again 262 * rc = 0 : success 263 * rc > 0 : Unrecoverable error, this node should be deleted. 264 */ 265 int rc = 0; 266 267 BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); 268 if (xd->xname) 269 return 0; 270 if (xd->flags & JFFS2_XFLAGS_INVALID) 271 return EIO; 272 if (unlikely(is_xattr_datum_unchecked(c, xd))) 273 rc = do_verify_xattr_datum(c, xd); 274 if (!rc) 275 rc = do_load_xattr_datum(c, xd); 276 return rc; 277} 278 279static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 280{ 281 /* must be called under down_write(xattr_sem) */ 282 struct jffs2_raw_xattr rx; 283 struct kvec vecs[2]; 284 size_t length; 285 int rc, totlen; 286 uint32_t phys_ofs = write_ofs(c); 287 288 BUG_ON(!xd->xname); 289 BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); 290 291 vecs[0].iov_base = ℞ 292 vecs[0].iov_len = sizeof(rx); 293 vecs[1].iov_base = xd->xname; 294 vecs[1].iov_len = xd->name_len + 1 + xd->value_len; 295 totlen = vecs[0].iov_len + vecs[1].iov_len; 296 297 /* Setup raw-xattr */ 298 memset(&rx, 0, sizeof(rx)); 299 rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 300 rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); 301 rx.totlen = cpu_to_je32(PAD(totlen)); 302 rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); 303 304 rx.xid = cpu_to_je32(xd->xid); 305 rx.version = cpu_to_je32(++xd->version); 306 rx.xprefix = xd->xprefix; 307 rx.name_len = xd->name_len; 308 rx.value_len = cpu_to_je16(xd->value_len); 309 rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); 310 rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); 311 312 rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); 313 if (rc || totlen != length) { 314 JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", 315 rc, totlen, length, phys_ofs); 316 rc = rc ? rc : -EIO; 317 if (length) 318 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); 319 320 return rc; 321 } 322 /* success */ 323 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); 324 325 dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", 326 xd->xid, xd->version, xd->xprefix, xd->xname); 327 328 return 0; 329} 330 331static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, 332 int xprefix, const char *xname, 333 const char *xvalue, int xsize) 334{ 335 /* must be called under down_write(xattr_sem) */ 336 struct jffs2_xattr_datum *xd; 337 uint32_t hashkey, name_len; 338 char *data; 339 int i, rc; 340 341 /* Search xattr_datum has same xname/xvalue by index */ 342 hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); 343 i = hashkey % XATTRINDEX_HASHSIZE; 344 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 345 if (xd->hashkey==hashkey 346 && xd->xprefix==xprefix 347 && xd->value_len==xsize 348 && !strcmp(xd->xname, xname) 349 && !memcmp(xd->xvalue, xvalue, xsize)) { 350 atomic_inc(&xd->refcnt); 351 return xd; 352 } 353 } 354 355 /* Not found, Create NEW XATTR-Cache */ 356 name_len = strlen(xname); 357 358 xd = jffs2_alloc_xattr_datum(); 359 if (!xd) 360 return ERR_PTR(-ENOMEM); 361 362 data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); 363 if (!data) { 364 jffs2_free_xattr_datum(xd); 365 return ERR_PTR(-ENOMEM); 366 } 367 strcpy(data, xname); 368 memcpy(data + name_len + 1, xvalue, xsize); 369 370 atomic_set(&xd->refcnt, 1); 371 xd->xid = ++c->highest_xid; 372 xd->flags |= JFFS2_XFLAGS_HOT; 373 xd->xprefix = xprefix; 374 375 xd->hashkey = hashkey; 376 xd->xname = data; 377 xd->xvalue = data + name_len + 1; 378 xd->name_len = name_len; 379 xd->value_len = xsize; 380 xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); 381 382 rc = save_xattr_datum(c, xd); 383 if (rc) { 384 kfree(xd->xname); 385 jffs2_free_xattr_datum(xd); 386 return ERR_PTR(rc); 387 } 388 389 /* Insert Hash Index */ 390 i = hashkey % XATTRINDEX_HASHSIZE; 391 list_add(&xd->xindex, &c->xattrindex[i]); 392 393 c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); 394 reclaim_xattr_datum(c); 395 396 return xd; 397} 398 399static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 400{ 401 /* must be called under down_write(xattr_sem) */ 402 if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { 403 unload_xattr_datum(c, xd); 404 xd->flags |= JFFS2_XFLAGS_DEAD; 405 if (xd->node == (void *)xd) { 406 BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); 407 jffs2_free_xattr_datum(xd); 408 } else { 409 list_add(&xd->xindex, &c->xattr_dead_list); 410 } 411 spin_unlock(&c->erase_completion_lock); 412 413 dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", 414 xd->xid, xd->version); 415 } 416} 417 418/* -------- xref related functions ------------------ 419 * verify_xattr_ref(c, ref) 420 * is used to load xref information from medium. Because summary data does not 421 * contain xid/ino, it's necessary to verify once while mounting process. 422 * save_xattr_ref(c, ref) 423 * is used to write xref to medium. If delete marker is marked, it write 424 * a delete marker of xref into medium. 425 * create_xattr_ref(c, ic, xd) 426 * is used to create a new xref and write to medium. 427 * delete_xattr_ref(c, ref) 428 * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, 429 * and allows GC to reclaim those physical nodes. 430 * jffs2_xattr_delete_inode(c, ic) 431 * is called to remove xrefs related to obsolete inode when inode is unlinked. 432 * jffs2_xattr_free_inode(c, ic) 433 * is called to release xattr related objects when unmounting. 434 * check_xattr_ref_inode(c, ic) 435 * is used to confirm inode does not have duplicate xattr name/value pair. 436 * -------------------------------------------------- */ 437static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 438{ 439 struct jffs2_eraseblock *jeb; 440 struct jffs2_raw_node_ref *raw; 441 struct jffs2_raw_xref rr; 442 size_t readlen; 443 uint32_t crc, offset, totlen; 444 int rc; 445 446 spin_lock(&c->erase_completion_lock); 447 if (ref_flags(ref->node) != REF_UNCHECKED) 448 goto complete; 449 offset = ref_offset(ref->node); 450 spin_unlock(&c->erase_completion_lock); 451 452 rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); 453 if (rc || sizeof(rr) != readlen) { 454 JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", 455 rc, sizeof(rr), readlen, offset); 456 return rc ? rc : -EIO; 457 } 458 /* obsolete node */ 459 crc = crc32(0, &rr, sizeof(rr) - 4); 460 if (crc != je32_to_cpu(rr.node_crc)) { 461 JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", 462 offset, je32_to_cpu(rr.node_crc), crc); 463 return EIO; 464 } 465 if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK 466 || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF 467 || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { 468 JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " 469 "nodetype=%#04x/%#04x, totlen=%u/%zu\n", 470 offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, 471 je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, 472 je32_to_cpu(rr.totlen), PAD(sizeof(rr))); 473 return EIO; 474 } 475 ref->ino = je32_to_cpu(rr.ino); 476 ref->xid = je32_to_cpu(rr.xid); 477 ref->xseqno = je32_to_cpu(rr.xseqno); 478 if (ref->xseqno > c->highest_xseqno) 479 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); 480 481 spin_lock(&c->erase_completion_lock); 482 complete: 483 for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { 484 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 485 totlen = PAD(ref_totlen(c, jeb, raw)); 486 if (ref_flags(raw) == REF_UNCHECKED) { 487 c->unchecked_size -= totlen; c->used_size += totlen; 488 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 489 } 490 raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); 491 } 492 spin_unlock(&c->erase_completion_lock); 493 494 dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", 495 ref->ino, ref->xid, ref_offset(ref->node)); 496 return 0; 497} 498 499static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 500{ 501 /* must be called under down_write(xattr_sem) */ 502 struct jffs2_raw_xref rr; 503 size_t length; 504 uint32_t xseqno, phys_ofs = write_ofs(c); 505 int ret; 506 507 rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 508 rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); 509 rr.totlen = cpu_to_je32(PAD(sizeof(rr))); 510 rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); 511 512 xseqno = (c->highest_xseqno += 2); 513 if (is_xattr_ref_dead(ref)) { 514 xseqno |= XREF_DELETE_MARKER; 515 rr.ino = cpu_to_je32(ref->ino); 516 rr.xid = cpu_to_je32(ref->xid); 517 } else { 518 rr.ino = cpu_to_je32(ref->ic->ino); 519 rr.xid = cpu_to_je32(ref->xd->xid); 520 } 521 rr.xseqno = cpu_to_je32(xseqno); 522 rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); 523 524 ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); 525 if (ret || sizeof(rr) != length) { 526 JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", 527 ret, sizeof(rr), length, phys_ofs); 528 ret = ret ? ret : -EIO; 529 if (length) 530 jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); 531 532 return ret; 533 } 534 /* success */ 535 ref->xseqno = xseqno; 536 jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); 537 538 dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); 539 540 return 0; 541} 542 543static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, 544 struct jffs2_xattr_datum *xd) 545{ 546 /* must be called under down_write(xattr_sem) */ 547 struct jffs2_xattr_ref *ref; 548 int ret; 549 550 ref = jffs2_alloc_xattr_ref(); 551 if (!ref) 552 return ERR_PTR(-ENOMEM); 553 ref->ic = ic; 554 ref->xd = xd; 555 556 ret = save_xattr_ref(c, ref); 557 if (ret) { 558 jffs2_free_xattr_ref(ref); 559 return ERR_PTR(ret); 560 } 561 562 /* Chain to inode */ 563 ref->next = ic->xref; 564 ic->xref = ref; 565 566 return ref; /* success */ 567} 568 569static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 570{ 571 /* must be called under down_write(xattr_sem) */ 572 struct jffs2_xattr_datum *xd; 573 574 xd = ref->xd; 575 ref->xseqno |= XREF_DELETE_MARKER; 576 ref->ino = ref->ic->ino; 577 ref->xid = ref->xd->xid; 578 spin_lock(&c->erase_completion_lock); 579 ref->next = c->xref_dead_list; 580 c->xref_dead_list = ref; 581 spin_unlock(&c->erase_completion_lock); 582 583 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", 584 ref->ino, ref->xid, ref->xseqno); 585 586 unrefer_xattr_datum(c, xd); 587} 588 589void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 590{ 591 /* It's called from jffs2_evict_inode() on inode removing. 592 When an inode with XATTR is removed, those XATTRs must be removed. */ 593 struct jffs2_xattr_ref *ref, *_ref; 594 595 if (!ic || ic->pino_nlink > 0) 596 return; 597 598 down_write(&c->xattr_sem); 599 for (ref = ic->xref; ref; ref = _ref) { 600 _ref = ref->next; 601 delete_xattr_ref(c, ref); 602 } 603 ic->xref = NULL; 604 up_write(&c->xattr_sem); 605} 606 607void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 608{ 609 /* It's called from jffs2_free_ino_caches() until unmounting FS. */ 610 struct jffs2_xattr_datum *xd; 611 struct jffs2_xattr_ref *ref, *_ref; 612 613 down_write(&c->xattr_sem); 614 for (ref = ic->xref; ref; ref = _ref) { 615 _ref = ref->next; 616 xd = ref->xd; 617 if (atomic_dec_and_test(&xd->refcnt)) { 618 unload_xattr_datum(c, xd); 619 jffs2_free_xattr_datum(xd); 620 } 621 jffs2_free_xattr_ref(ref); 622 } 623 ic->xref = NULL; 624 up_write(&c->xattr_sem); 625} 626 627static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) 628{ 629 /* success of check_xattr_ref_inode() means that inode (ic) dose not have 630 * duplicate name/value pairs. If duplicate name/value pair would be found, 631 * one will be removed. 632 */ 633 struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; 634 int rc = 0; 635 636 if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) 637 return 0; 638 down_write(&c->xattr_sem); 639 retry: 640 rc = 0; 641 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 642 if (!ref->xd->xname) { 643 rc = load_xattr_datum(c, ref->xd); 644 if (unlikely(rc > 0)) { 645 *pref = ref->next; 646 delete_xattr_ref(c, ref); 647 goto retry; 648 } else if (unlikely(rc < 0)) 649 goto out; 650 } 651 for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { 652 if (!cmp->xd->xname) { 653 ref->xd->flags |= JFFS2_XFLAGS_BIND; 654 rc = load_xattr_datum(c, cmp->xd); 655 ref->xd->flags &= ~JFFS2_XFLAGS_BIND; 656 if (unlikely(rc > 0)) { 657 *pcmp = cmp->next; 658 delete_xattr_ref(c, cmp); 659 goto retry; 660 } else if (unlikely(rc < 0)) 661 goto out; 662 } 663 if (ref->xd->xprefix == cmp->xd->xprefix 664 && !strcmp(ref->xd->xname, cmp->xd->xname)) { 665 if (ref->xseqno > cmp->xseqno) { 666 *pcmp = cmp->next; 667 delete_xattr_ref(c, cmp); 668 } else { 669 *pref = ref->next; 670 delete_xattr_ref(c, ref); 671 } 672 goto retry; 673 } 674 } 675 } 676 ic->flags |= INO_FLAGS_XATTR_CHECKED; 677 out: 678 up_write(&c->xattr_sem); 679 680 return rc; 681} 682 683/* -------- xattr subsystem functions --------------- 684 * jffs2_init_xattr_subsystem(c) 685 * is used to initialize semaphore and list_head, and some variables. 686 * jffs2_find_xattr_datum(c, xid) 687 * is used to lookup xdatum while scanning process. 688 * jffs2_clear_xattr_subsystem(c) 689 * is used to release any xattr related objects. 690 * jffs2_build_xattr_subsystem(c) 691 * is used to associate xdatum and xref while super block building process. 692 * jffs2_setup_xattr_datum(c, xid, version) 693 * is used to insert xdatum while scanning process. 694 * -------------------------------------------------- */ 695void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) 696{ 697 int i; 698 699 for (i=0; i < XATTRINDEX_HASHSIZE; i++) 700 INIT_LIST_HEAD(&c->xattrindex[i]); 701 INIT_LIST_HEAD(&c->xattr_unchecked); 702 INIT_LIST_HEAD(&c->xattr_dead_list); 703 c->xref_dead_list = NULL; 704 c->xref_temp = NULL; 705 706 init_rwsem(&c->xattr_sem); 707 c->highest_xid = 0; 708 c->highest_xseqno = 0; 709 c->xdatum_mem_usage = 0; 710 c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ 711} 712 713static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) 714{ 715 struct jffs2_xattr_datum *xd; 716 int i = xid % XATTRINDEX_HASHSIZE; 717 718 /* It's only used in scanning/building process. */ 719 BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); 720 721 list_for_each_entry(xd, &c->xattrindex[i], xindex) { 722 if (xd->xid==xid) 723 return xd; 724 } 725 return NULL; 726} 727 728void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) 729{ 730 struct jffs2_xattr_datum *xd, *_xd; 731 struct jffs2_xattr_ref *ref, *_ref; 732 int i; 733 734 for (ref=c->xref_temp; ref; ref = _ref) { 735 _ref = ref->next; 736 jffs2_free_xattr_ref(ref); 737 } 738 739 for (ref=c->xref_dead_list; ref; ref = _ref) { 740 _ref = ref->next; 741 jffs2_free_xattr_ref(ref); 742 } 743 744 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 745 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 746 list_del(&xd->xindex); 747 if (xd->xname) 748 kfree(xd->xname); 749 jffs2_free_xattr_datum(xd); 750 } 751 } 752 753 list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { 754 list_del(&xd->xindex); 755 jffs2_free_xattr_datum(xd); 756 } 757 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 758 list_del(&xd->xindex); 759 jffs2_free_xattr_datum(xd); 760 } 761} 762 763#define XREF_TMPHASH_SIZE (128) 764void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) 765{ 766 struct jffs2_xattr_ref *ref, *_ref; 767 struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; 768 struct jffs2_xattr_datum *xd, *_xd; 769 struct jffs2_inode_cache *ic; 770 struct jffs2_raw_node_ref *raw; 771 int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; 772 int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; 773 774 BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); 775 776 /* Phase.1 : Merge same xref */ 777 for (i=0; i < XREF_TMPHASH_SIZE; i++) 778 xref_tmphash[i] = NULL; 779 for (ref=c->xref_temp; ref; ref=_ref) { 780 struct jffs2_xattr_ref *tmp; 781 782 _ref = ref->next; 783 if (ref_flags(ref->node) != REF_PRISTINE) { 784 if (verify_xattr_ref(c, ref)) { 785 BUG_ON(ref->node->next_in_ino != (void *)ref); 786 ref->node->next_in_ino = NULL; 787 jffs2_mark_node_obsolete(c, ref->node); 788 jffs2_free_xattr_ref(ref); 789 continue; 790 } 791 } 792 793 i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; 794 for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { 795 if (tmp->ino == ref->ino && tmp->xid == ref->xid) 796 break; 797 } 798 if (tmp) { 799 raw = ref->node; 800 if (ref->xseqno > tmp->xseqno) { 801 tmp->xseqno = ref->xseqno; 802 raw->next_in_ino = tmp->node; 803 tmp->node = raw; 804 } else { 805 raw->next_in_ino = tmp->node->next_in_ino; 806 tmp->node->next_in_ino = raw; 807 } 808 jffs2_free_xattr_ref(ref); 809 continue; 810 } else { 811 ref->next = xref_tmphash[i]; 812 xref_tmphash[i] = ref; 813 } 814 } 815 c->xref_temp = NULL; 816 817 /* Phase.2 : Bind xref with inode_cache and xattr_datum */ 818 for (i=0; i < XREF_TMPHASH_SIZE; i++) { 819 for (ref=xref_tmphash[i]; ref; ref=_ref) { 820 xref_count++; 821 _ref = ref->next; 822 if (is_xattr_ref_dead(ref)) { 823 ref->next = c->xref_dead_list; 824 c->xref_dead_list = ref; 825 xref_dead_count++; 826 continue; 827 } 828 /* At this point, ref->xid and ref->ino contain XID and inode number. 829 ref->xd and ref->ic are not valid yet. */ 830 xd = jffs2_find_xattr_datum(c, ref->xid); 831 ic = jffs2_get_ino_cache(c, ref->ino); 832 if (!xd || !ic || !ic->pino_nlink) { 833 dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", 834 ref->ino, ref->xid, ref->xseqno); 835 ref->xseqno |= XREF_DELETE_MARKER; 836 ref->next = c->xref_dead_list; 837 c->xref_dead_list = ref; 838 xref_orphan_count++; 839 continue; 840 } 841 ref->xd = xd; 842 ref->ic = ic; 843 atomic_inc(&xd->refcnt); 844 ref->next = ic->xref; 845 ic->xref = ref; 846 } 847 } 848 849 /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ 850 for (i=0; i < XATTRINDEX_HASHSIZE; i++) { 851 list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { 852 xdatum_count++; 853 list_del_init(&xd->xindex); 854 if (!atomic_read(&xd->refcnt)) { 855 dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", 856 xd->xid, xd->version); 857 xd->flags |= JFFS2_XFLAGS_DEAD; 858 list_add(&xd->xindex, &c->xattr_unchecked); 859 xdatum_orphan_count++; 860 continue; 861 } 862 if (is_xattr_datum_unchecked(c, xd)) { 863 dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", 864 xd->xid, xd->version); 865 list_add(&xd->xindex, &c->xattr_unchecked); 866 xdatum_unchecked_count++; 867 } 868 } 869 } 870 /* build complete */ 871 JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" 872 " (%u unchecked, %u orphan) and " 873 "%u of xref (%u dead, %u orphan) found.\n", 874 xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, 875 xref_count, xref_dead_count, xref_orphan_count); 876} 877 878struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, 879 uint32_t xid, uint32_t version) 880{ 881 struct jffs2_xattr_datum *xd; 882 883 xd = jffs2_find_xattr_datum(c, xid); 884 if (!xd) { 885 xd = jffs2_alloc_xattr_datum(); 886 if (!xd) 887 return ERR_PTR(-ENOMEM); 888 xd->xid = xid; 889 xd->version = version; 890 if (xd->xid > c->highest_xid) 891 c->highest_xid = xd->xid; 892 list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); 893 } 894 return xd; 895} 896 897/* -------- xattr subsystem functions --------------- 898 * xprefix_to_handler(xprefix) 899 * is used to translate xprefix into xattr_handler. 900 * jffs2_listxattr(dentry, buffer, size) 901 * is an implementation of listxattr handler on jffs2. 902 * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) 903 * is an implementation of getxattr handler on jffs2. 904 * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) 905 * is an implementation of setxattr handler on jffs2. 906 * -------------------------------------------------- */ 907const struct xattr_handler *jffs2_xattr_handlers[] = { 908 &jffs2_user_xattr_handler, 909#ifdef CONFIG_JFFS2_FS_SECURITY 910 &jffs2_security_xattr_handler, 911#endif 912#ifdef CONFIG_JFFS2_FS_POSIX_ACL 913 &jffs2_acl_access_xattr_handler, 914 &jffs2_acl_default_xattr_handler, 915#endif 916 &jffs2_trusted_xattr_handler, 917 NULL 918}; 919 920static const struct xattr_handler *xprefix_to_handler(int xprefix) { 921 const struct xattr_handler *ret; 922 923 switch (xprefix) { 924 case JFFS2_XPREFIX_USER: 925 ret = &jffs2_user_xattr_handler; 926 break; 927#ifdef CONFIG_JFFS2_FS_SECURITY 928 case JFFS2_XPREFIX_SECURITY: 929 ret = &jffs2_security_xattr_handler; 930 break; 931#endif 932#ifdef CONFIG_JFFS2_FS_POSIX_ACL 933 case JFFS2_XPREFIX_ACL_ACCESS: 934 ret = &jffs2_acl_access_xattr_handler; 935 break; 936 case JFFS2_XPREFIX_ACL_DEFAULT: 937 ret = &jffs2_acl_default_xattr_handler; 938 break; 939#endif 940 case JFFS2_XPREFIX_TRUSTED: 941 ret = &jffs2_trusted_xattr_handler; 942 break; 943 default: 944 ret = NULL; 945 break; 946 } 947 return ret; 948} 949 950ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) 951{ 952 struct inode *inode = dentry->d_inode; 953 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 954 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 955 struct jffs2_inode_cache *ic = f->inocache; 956 struct jffs2_xattr_ref *ref, **pref; 957 struct jffs2_xattr_datum *xd; 958 const struct xattr_handler *xhandle; 959 ssize_t len, rc; 960 int retry = 0; 961 962 rc = check_xattr_ref_inode(c, ic); 963 if (unlikely(rc)) 964 return rc; 965 966 down_read(&c->xattr_sem); 967 retry: 968 len = 0; 969 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 970 BUG_ON(ref->ic != ic); 971 xd = ref->xd; 972 if (!xd->xname) { 973 /* xdatum is unchached */ 974 if (!retry) { 975 retry = 1; 976 up_read(&c->xattr_sem); 977 down_write(&c->xattr_sem); 978 goto retry; 979 } else { 980 rc = load_xattr_datum(c, xd); 981 if (unlikely(rc > 0)) { 982 *pref = ref->next; 983 delete_xattr_ref(c, ref); 984 goto retry; 985 } else if (unlikely(rc < 0)) 986 goto out; 987 } 988 } 989 xhandle = xprefix_to_handler(xd->xprefix); 990 if (!xhandle) 991 continue; 992 if (buffer) { 993 rc = xhandle->list(dentry, buffer+len, size-len, 994 xd->xname, xd->name_len, xd->flags); 995 } else { 996 rc = xhandle->list(dentry, NULL, 0, xd->xname, 997 xd->name_len, xd->flags); 998 } 999 if (rc < 0) 1000 goto out; 1001 len += rc; 1002 } 1003 rc = len; 1004 out: 1005 if (!retry) { 1006 up_read(&c->xattr_sem); 1007 } else { 1008 up_write(&c->xattr_sem); 1009 } 1010 return rc; 1011} 1012 1013int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, 1014 char *buffer, size_t size) 1015{ 1016 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1017 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1018 struct jffs2_inode_cache *ic = f->inocache; 1019 struct jffs2_xattr_datum *xd; 1020 struct jffs2_xattr_ref *ref, **pref; 1021 int rc, retry = 0; 1022 1023 rc = check_xattr_ref_inode(c, ic); 1024 if (unlikely(rc)) 1025 return rc; 1026 1027 down_read(&c->xattr_sem); 1028 retry: 1029 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1030 BUG_ON(ref->ic!=ic); 1031 1032 xd = ref->xd; 1033 if (xd->xprefix != xprefix) 1034 continue; 1035 if (!xd->xname) { 1036 /* xdatum is unchached */ 1037 if (!retry) { 1038 retry = 1; 1039 up_read(&c->xattr_sem); 1040 down_write(&c->xattr_sem); 1041 goto retry; 1042 } else { 1043 rc = load_xattr_datum(c, xd); 1044 if (unlikely(rc > 0)) { 1045 *pref = ref->next; 1046 delete_xattr_ref(c, ref); 1047 goto retry; 1048 } else if (unlikely(rc < 0)) { 1049 goto out; 1050 } 1051 } 1052 } 1053 if (!strcmp(xname, xd->xname)) { 1054 rc = xd->value_len; 1055 if (buffer) { 1056 if (size < rc) { 1057 rc = -ERANGE; 1058 } else { 1059 memcpy(buffer, xd->xvalue, rc); 1060 } 1061 } 1062 goto out; 1063 } 1064 } 1065 rc = -ENODATA; 1066 out: 1067 if (!retry) { 1068 up_read(&c->xattr_sem); 1069 } else { 1070 up_write(&c->xattr_sem); 1071 } 1072 return rc; 1073} 1074 1075int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, 1076 const char *buffer, size_t size, int flags) 1077{ 1078 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 1079 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); 1080 struct jffs2_inode_cache *ic = f->inocache; 1081 struct jffs2_xattr_datum *xd; 1082 struct jffs2_xattr_ref *ref, *newref, **pref; 1083 uint32_t length, request; 1084 int rc; 1085 1086 rc = check_xattr_ref_inode(c, ic); 1087 if (unlikely(rc)) 1088 return rc; 1089 1090 request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); 1091 rc = jffs2_reserve_space(c, request, &length, 1092 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); 1093 if (rc) { 1094 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1095 return rc; 1096 } 1097 1098 /* Find existing xattr */ 1099 down_write(&c->xattr_sem); 1100 retry: 1101 for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { 1102 xd = ref->xd; 1103 if (xd->xprefix != xprefix) 1104 continue; 1105 if (!xd->xname) { 1106 rc = load_xattr_datum(c, xd); 1107 if (unlikely(rc > 0)) { 1108 *pref = ref->next; 1109 delete_xattr_ref(c, ref); 1110 goto retry; 1111 } else if (unlikely(rc < 0)) 1112 goto out; 1113 } 1114 if (!strcmp(xd->xname, xname)) { 1115 if (flags & XATTR_CREATE) { 1116 rc = -EEXIST; 1117 goto out; 1118 } 1119 if (!buffer) { 1120 ref->ino = ic->ino; 1121 ref->xid = xd->xid; 1122 ref->xseqno |= XREF_DELETE_MARKER; 1123 rc = save_xattr_ref(c, ref); 1124 if (!rc) { 1125 *pref = ref->next; 1126 spin_lock(&c->erase_completion_lock); 1127 ref->next = c->xref_dead_list; 1128 c->xref_dead_list = ref; 1129 spin_unlock(&c->erase_completion_lock); 1130 unrefer_xattr_datum(c, xd); 1131 } else { 1132 ref->ic = ic; 1133 ref->xd = xd; 1134 ref->xseqno &= ~XREF_DELETE_MARKER; 1135 } 1136 goto out; 1137 } 1138 goto found; 1139 } 1140 } 1141 /* not found */ 1142 if (flags & XATTR_REPLACE) { 1143 rc = -ENODATA; 1144 goto out; 1145 } 1146 if (!buffer) { 1147 rc = -ENODATA; 1148 goto out; 1149 } 1150 found: 1151 xd = create_xattr_datum(c, xprefix, xname, buffer, size); 1152 if (IS_ERR(xd)) { 1153 rc = PTR_ERR(xd); 1154 goto out; 1155 } 1156 up_write(&c->xattr_sem); 1157 jffs2_complete_reservation(c); 1158 1159 /* create xattr_ref */ 1160 request = PAD(sizeof(struct jffs2_raw_xref)); 1161 rc = jffs2_reserve_space(c, request, &length, 1162 ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); 1163 down_write(&c->xattr_sem); 1164 if (rc) { 1165 JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); 1166 unrefer_xattr_datum(c, xd); 1167 up_write(&c->xattr_sem); 1168 return rc; 1169 } 1170 if (ref) 1171 *pref = ref->next; 1172 newref = create_xattr_ref(c, ic, xd); 1173 if (IS_ERR(newref)) { 1174 if (ref) { 1175 ref->next = ic->xref; 1176 ic->xref = ref; 1177 } 1178 rc = PTR_ERR(newref); 1179 unrefer_xattr_datum(c, xd); 1180 } else if (ref) { 1181 delete_xattr_ref(c, ref); 1182 } 1183 out: 1184 up_write(&c->xattr_sem); 1185 jffs2_complete_reservation(c); 1186 return rc; 1187} 1188 1189/* -------- garbage collector functions ------------- 1190 * jffs2_garbage_collect_xattr_datum(c, xd, raw) 1191 * is used to move xdatum into new node. 1192 * jffs2_garbage_collect_xattr_ref(c, ref, raw) 1193 * is used to move xref into new node. 1194 * jffs2_verify_xattr(c) 1195 * is used to call do_verify_xattr_datum() before garbage collecting. 1196 * jffs2_release_xattr_datum(c, xd) 1197 * is used to release an in-memory object of xdatum. 1198 * jffs2_release_xattr_ref(c, ref) 1199 * is used to release an in-memory object of xref. 1200 * -------------------------------------------------- */ 1201int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, 1202 struct jffs2_raw_node_ref *raw) 1203{ 1204 uint32_t totlen, length, old_ofs; 1205 int rc = 0; 1206 1207 down_write(&c->xattr_sem); 1208 if (xd->node != raw) 1209 goto out; 1210 if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) 1211 goto out; 1212 1213 rc = load_xattr_datum(c, xd); 1214 if (unlikely(rc)) { 1215 rc = (rc > 0) ? 0 : rc; 1216 goto out; 1217 } 1218 old_ofs = ref_offset(xd->node); 1219 totlen = PAD(sizeof(struct jffs2_raw_xattr) 1220 + xd->name_len + 1 + xd->value_len); 1221 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); 1222 if (rc) { 1223 JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); 1224 goto out; 1225 } 1226 rc = save_xattr_datum(c, xd); 1227 if (!rc) 1228 dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", 1229 xd->xid, xd->version, old_ofs, ref_offset(xd->node)); 1230 out: 1231 if (!rc) 1232 jffs2_mark_node_obsolete(c, raw); 1233 up_write(&c->xattr_sem); 1234 return rc; 1235} 1236 1237int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, 1238 struct jffs2_raw_node_ref *raw) 1239{ 1240 uint32_t totlen, length, old_ofs; 1241 int rc = 0; 1242 1243 down_write(&c->xattr_sem); 1244 BUG_ON(!ref->node); 1245 1246 if (ref->node != raw) 1247 goto out; 1248 if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) 1249 goto out; 1250 1251 old_ofs = ref_offset(ref->node); 1252 totlen = ref_totlen(c, c->gcblock, ref->node); 1253 1254 rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); 1255 if (rc) { 1256 JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", 1257 __func__, rc, totlen); 1258 rc = rc ? rc : -EBADFD; 1259 goto out; 1260 } 1261 rc = save_xattr_ref(c, ref); 1262 if (!rc) 1263 dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", 1264 ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); 1265 out: 1266 if (!rc) 1267 jffs2_mark_node_obsolete(c, raw); 1268 up_write(&c->xattr_sem); 1269 return rc; 1270} 1271 1272int jffs2_verify_xattr(struct jffs2_sb_info *c) 1273{ 1274 struct jffs2_xattr_datum *xd, *_xd; 1275 struct jffs2_eraseblock *jeb; 1276 struct jffs2_raw_node_ref *raw; 1277 uint32_t totlen; 1278 int rc; 1279 1280 down_write(&c->xattr_sem); 1281 list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { 1282 rc = do_verify_xattr_datum(c, xd); 1283 if (rc < 0) 1284 continue; 1285 list_del_init(&xd->xindex); 1286 spin_lock(&c->erase_completion_lock); 1287 for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { 1288 if (ref_flags(raw) != REF_UNCHECKED) 1289 continue; 1290 jeb = &c->blocks[ref_offset(raw) / c->sector_size]; 1291 totlen = PAD(ref_totlen(c, jeb, raw)); 1292 c->unchecked_size -= totlen; c->used_size += totlen; 1293 jeb->unchecked_size -= totlen; jeb->used_size += totlen; 1294 raw->flash_offset = ref_offset(raw) 1295 | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); 1296 } 1297 if (xd->flags & JFFS2_XFLAGS_DEAD) 1298 list_add(&xd->xindex, &c->xattr_dead_list); 1299 spin_unlock(&c->erase_completion_lock); 1300 } 1301 up_write(&c->xattr_sem); 1302 return list_empty(&c->xattr_unchecked) ? 1 : 0; 1303} 1304 1305void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) 1306{ 1307 /* must be called under spin_lock(&c->erase_completion_lock) */ 1308 if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) 1309 return; 1310 1311 list_del(&xd->xindex); 1312 jffs2_free_xattr_datum(xd); 1313} 1314 1315void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) 1316{ 1317 /* must be called under spin_lock(&c->erase_completion_lock) */ 1318 struct jffs2_xattr_ref *tmp, **ptmp; 1319 1320 if (ref->node != (void *)ref) 1321 return; 1322 1323 for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { 1324 if (ref == tmp) { 1325 *ptmp = tmp->next; 1326 break; 1327 } 1328 } 1329 jffs2_free_xattr_ref(ref); 1330} 1331